US20090152233A1 - Printed circuit board having chip package mounted thereon and method of fabricating same - Google Patents
Printed circuit board having chip package mounted thereon and method of fabricating same Download PDFInfo
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- US20090152233A1 US20090152233A1 US12/367,738 US36773809A US2009152233A1 US 20090152233 A1 US20090152233 A1 US 20090152233A1 US 36773809 A US36773809 A US 36773809A US 2009152233 A1 US2009152233 A1 US 2009152233A1
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- Prior art keywords
- chip package
- circuit
- layer
- substrate
- contact portion
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/182—Printed circuits structurally associated with non-printed electric components associated with components mounted in the printed circuit board, e.g. insert mounted components [IMC]
- H05K1/183—Components mounted in and supported by recessed areas of the printed circuit board
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4697—Manufacturing multilayer circuits having cavities, e.g. for mounting components
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10734—Ball grid array [BGA]; Bump grid array
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/13—Moulding and encapsulation; Deposition techniques; Protective layers
- H05K2203/1377—Protective layers
- H05K2203/1394—Covering open PTHs, e.g. by dry film resist or by metal disc
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
- H05K3/061—Etching masks
- H05K3/062—Etching masks consisting of metals or alloys or metallic inorganic compounds
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
- H05K3/061—Etching masks
- H05K3/064—Photoresists
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/24—Reinforcing the conductive pattern
- H05K3/244—Finish plating of conductors, especially of copper conductors, e.g. for pads or lands
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4644—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
- H05K3/4652—Adding a circuit layer by laminating a metal foil or a preformed metal foil pattern
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
Definitions
- the present invention relates, in general, to a printed circuit board (PCB) and a method of fabricating the same and, more particularly, to a PCB and a method of fabricating the same, in which a contact portion is formed on an internal layer of the multi-layered PCB, a groove is formed so as to expose the contact portion of the internal layer, and a chip package is mounted on the PCB while being flip-chip bonded to the exposed contact portion of the internal layer.
- PCB printed circuit board
- a semiconductor package is exemplified by a resin seal package, a tape carrier package (TCP), a glass seal package, and a metal seal package. Furthermore, the semiconductor package is classified into a TH-type, in which a hole is formed through a PCB and a pin is inserted into the hole, and a surface mounting technology (SMT) type, in which it is mounted on a surface of a PCB, according to a mounting method thereof.
- TH-type in which a hole is formed through a PCB and a pin is inserted into the hole
- SMT surface mounting technology
- the TH-type is the typical integrated circuit (IC) package which has been used for the longest time, and representative examples include a dual inline package (DIP), in which a plurality of pins protrude from both sides of the package in a straight line, and a pin grid array (PGA), in which pins are arranged on the underside of a large hexahedron.
- DIP dual inline package
- PGA pin grid array
- the SMT-type is a package having a structure in which, when a packaged chip is electrically connected to a substrate, the electric connection is achieved on the substrate unlike the TH-type, in which the pin is inserted into the hole and soldered.
- the SMT-type is advantageous in that, assuming that chips having the same size are employed, the mounting area is reduced because of the small size, it is thin and lightweight, and operation speed improves with an increase in frequency because of a low parasitic capacitance or inductance.
- SMT-type package examples include a quad flat package (QFP), a plastic leaded chip carrier (PLCC), a ceramic leaded chip carrier (CLCC), and a ball grid array (BGA).
- QFP quad flat package
- PLCC plastic leaded chip carrier
- CLCC ceramic leaded chip carrier
- BGA ball grid array
- a thin chip may be fabricated to satisfy such a necessity. In this case, however, handling problems and signal interference problems between layers may occur.
- Japanese Pat. Laid-Open Publication No. 11-274734 discloses an electronic circuit device which is provided with a circuit substrate that acts as a core, electronic parts mounted on the circuit substrate, an insulating layer formed on the circuit substrate, and a circuit formed on the insulating layer.
- FIG. 1 is a sectional view of a conventional PCB having a chip mounted thereon.
- a circuit substrate 10 is used as a core, and circuit patterns 12 , 18 are formed on upper and lower sides of the circuit substrate.
- a through hole 13 is formed through the circuit substrate 10 to connect external and internal circuits to each other.
- a chip 16 is flip-chip bonded to the circuit substrate 10 and thus mounted on it.
- a welding bump 17 formed on a pad of the integrated circuit chip 16 is connected to a land 18 on the circuit substrate 10 .
- a plurality of insulating layers 22 is laminated on the circuit substrate 10 , and a circuit pattern 25 is formed on each of the insulating layers 22 .
- an integrated circuit chip 29 is mounted on an external surface of the outermost layer 22 of the insulating layers 22 , and connected to a wire pattern on the surface of the outermost insulating layer 22 .
- an object of the present invention is to provide a PCB and a method of fabricating the same.
- a contact portion, on which a chip package is to be mounted is formed in the PCB, the lamination of layers is conducted so that the contact portion formed on an internal layer of a substrate is exposed, and the chip package is flip-chip bonded to the contact portion of the internal layer, thereby mounting the thick chip package in a space having a restricted height on a surface of the substrate.
- a PCB having a chip package mounted thereon, which comprises a substrate having a plurality of electric contact portions formed on an upper side thereof and acting as a core.
- the chip package is mounted on the substrate and has bumps connected to the electric contact portions.
- An insulating layer is laminated on the substrate and has a hole in which the chip package is to be mounted.
- the present invention provides a method of fabricating a PCB having a chip package mounted thereon.
- the method includes the steps of forming a first etching resistor to form an electric contact portion on an upper side of a first circuit layer on one side of a substrate; applying a first photosensitive substance on the first circuit layer of the substrate to form a first circuit pattern on the first circuit layer, and removing the first photosensitive substance; laminating an insulating layer and a second circuit layer on the substrate, and forming a hole through a portion of the insulating layer, in which the chip package is to be mounted; applying a second photosensitive substance to form a second circuit pattern on the second circuit layer, and forming the electric contact portion on the exposed first circuit layer of the substrate, on which the first etching resistor is formed; and mounting the chip package so that the chip package is connected to the electric contact portion formed on an exposed internal layer of the substrate.
- the present invention provides a method of fabricating a PCB having a chip package mounted thereon.
- the method includes the steps of laminating an insulating layer and a first circuit layer on an upper side of a second circuit layer on one side of a substrate, on which a first circuit pattern is formed; removing portions of the insulating layer and the first circuit layer laminated on the substrate, which have a position corresponding to an area in which the chip package is to be mounted; applying a photosensitive substance on internal and external layers so that the photosensitive substance adheres closely to the internal and external layers, and forming a second circuit pattern on the photosensitive substance to form an electric contact portion and to form a third circuit pattern on the external layer; conducting an etching process using the second circuit pattern, formed on the photosensitive substance, to form the third circuit pattern on the external layer and to form the electric contact portion on the internal layer; and mounting the chip package so that the chip package is connected to the electric contact portion formed on the exposed second circuit layer of the substrate.
- the present invention provides a method of fabricating a PCB having a chip package mounted thereon.
- the method includes the steps of forming a first circuit pattern, which includes an electric contact portion, to be connected to the chip package, on a first circuit layer of a substrate; laminating an insulating layer and a second circuit layer on an upper side of the first circuit layer on one side of the substrate, on which the first circuit pattern is formed; removing portions of the insulating layer and the second circuit layer laminated on the substrate, which have a position corresponding to an area in which the chip package is to be mounted; and mounting the chip package so that the chip package is connected to the electric contact portion formed on the exposed first circuit layer of the substrate.
- the present invention provides a method of fabricating a PCB having a chip package mounted thereon.
- the method includes the steps of forming a first circuit pattern, which includes an electric contact portion, to be connected to the chip package, on a first circuit layer of a substrate; surrounding the electric contact portion using an etching resistor; laminating an insulating layer, through which a hole is formed so as to mount the chip package therein while the chip package being connected to the electric contact portion, and laminating a second circuit layer on the insulating layer; laminating a photosensitive substance on the second circuit layer, forming a second circuit pattern, of which a portion, having a position corresponding to the hole, is removed, on the photosensitive substance, and etching the resulting substrate to form a third circuit pattern on the second circuit layer; and mounting the chip package so that the chip package is connected to the electric contact portion formed on the exposed first circuit layer of the substrate.
- FIG. 1 is a sectional view of a conventional PCB having a chip mounted thereon;
- FIG. 2 is a sectional view of a PCB having a chip package mounted thereon according to an embodiment of the present invention
- FIGS. 3 a to 3 p are sectional views illustrating the fabrication of the PCB having the chip package mounted thereon according to an embodiment of the present invention
- FIGS. 4 a to 4 q are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to a further embodiment of the present invention
- FIGS. 5 a to 5 k are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention
- FIGS. 6 a to 6 l are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to a further embodiment of the present invention
- FIGS. 7 a to 7 l are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention.
- FIGS. 8 a to 8 m are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to a further embodiment of the present invention.
- FIGS. 9 a to 9 d are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention.
- FIG. 2 is a sectional view of a PCB having a chip package mounted thereon according to an embodiment of the present invention.
- the PCB having the chip package mounted thereon comprises a copper clad laminate 210 acting as a core, a plurality of insulating layers 231 , 233 laminated on the copper clad laminate 210 , a plurality of circuit layers 232 , 234 , solder resist films 240 , 241 applied on the external circuit layers 232 , 234 and an exposed internal circuit layer 212 , a chip package 250 , and a conductive material 242 interposed between bumps 251 of the chip package 250 and contact portions of the internal circuit layer 212 .
- the copper clad laminate 210 is made of an insulating material, and comprises an insulating layer 211 having a predetermined thickness, and copper foil layers 212 , 213 positioned on both sides of the insulating layer 211 and having circuit patterns.
- the contact portions to which the bumps 251 of the chip package 250 are capable of being flip-chip bonded, are formed on the copper foil layer 212 on one side of the insulating layer 211 .
- the contact portions are electrically connected to other portions 213 through holes 214 .
- a groove which corresponds in size to the chip package 250 , is formed on the insulating layer 231 laminated on an upper side of the copper clad laminate 211 so that the chip package 250 is flip-chip bonded to the contact portions formed in the internal circuit layer 212 . Furthermore, the contact portions of the internal circuit layer 212 are exposed.
- the chip package 250 is flip-chip bonded through the groove to the contact portions using the bumps 251 attached thereto, thereby being mounted on the PCB.
- the electric conductive material 242 may be applied so as to improve the adhesion strength between the bumps 251 of the chip package 250 and the contact portions.
- solder resist may be applied on the external circuit layers 232 and the exposed internal circuit layer 212 .
- a side wall connection is feasible by use of a lead frame, and thus, it is possible to assure many channels for signal connection.
- FIGS. 3 a to 3 p are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to an embodiment of the present invention.
- a circuit substrate 310 acting as a core is provided.
- the circuit substrate 310 is made of an insulating material, and comprises an insulating layer 311 , having a predetermined thickness, and copper foil layers 312 , 313 positioned on upper and lower sides of the insulating layer 311 . Furthermore, a plurality of through holes 314 is formed through the circuit substrate 310 to connect circuits on both sides of the circuit substrate to each other.
- photosensitive substances 321 , 322 are applied on the copper foil layers 312 , 313 of the circuit substrate 310 .
- the upper photosensitive substance 321 is selectively removed through exposure and development processes to expose a portion of the copper foil layer 312 which is not to be removed, thereby forming a portion on which the chip package is to be mounted.
- Such a photolithography process may be classified into a photographic process and a screen printing process.
- the photographic process is divided into a dry film (D/F) process using a dry film as a photosensitive material, and a photosensitive liquid process using photosensitive liquid.
- an etching resistor 323 which is capable of being used as a resistor during a copper etching process using gold or nickel, is applied on the exposed portion of the copper foil layer so as to prevent the copper foil layer from being etched when the copper etching process is conducted using gold or nickel, thereby providing an electric connection to the chip package to be mounted. At this time, it is preferable to form the etching resistor 323 through a plating process.
- the photosensitive substances 321 , 322 are removed from both sides of the copper foil layers 312 , 313 using a stripping process, and photosensitive substances 324 , 325 are further applied to form a circuit as shown in FIG. 3 f.
- the photosensitive substances 324 , 325 as the etching resist are stripped to complete the formation of the circuit pattern of the copper foil.
- the etching resistor 323 must not be removed.
- the photosensitive substances 324 , 325 are removed through a stripping process, and a plurality of insulating layers 331 , 333 and circuit layers 332 , 334 are further laminated.
- the copper foil positioned on that portion of the insulating layer 331 is removed through a process using a laser or a plasma.
- a portion of the insulating layer 331 is removed through a process, using a laser or a plasma, capable of removing the insulating layer 331 .
- a material of the insulating layer, which is to be removed be different from that of the insulating layer, which must not be removed, so as to prevent the insulating layer, which must not be removed, from being etched.
- photosensitive materials 335 , 336 are applied to form circuits on the outermost layers 332 , 334 .
- the photosensitive materials 335 , 336 are exposed and developed to form circuit patterns thereon. At this time, a portion of the photosensitive materials 335 , 336 , corresponding in position to an area in which the chip package is to be mounted, is removed so that an exposed copper foil portion of the internal layer 312 , corresponding in position to an area in which the chip package is to be mounted, is removed by a copper etching process.
- wire patterns are formed on the external circuit layers 332 , 334 and the exposed internal copper foil layer 312 using the circuit patterns of the photosensitive materials 335 , 336 and the etching resistor 323 as an etching resist.
- circuits are formed on a surface of the resulting substrate and the copper foils 312 , 332 , 334 of the internal layer through the etching process.
- the chip package is mounted on the surface of the internal layer of the substrate.
- the etching resistor 323 formed on the internal layer must be removed, the removal may be conducted through an etching resistor stripping process as shown in FIG. 3 p .
- the etching resistor is formed by gold plating, it is preferable that the etching resistor be not removed.
- FIGS. 4 a to 4 q are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention.
- a circuit substrate 410 acting as a core is provided.
- the circuit substrate 410 is made of an insulating material, and comprises an insulating layer 411 , having a predetermined thickness, and copper foil layers 412 , 413 positioned on upper and lower sides of the insulating layer 411 . Furthermore, a plurality of through holes 414 is formed through the circuit substrate 410 to connect circuits on both sides of the circuit substrate to each other.
- photosensitive substances 421 , 422 are applied on the copper foil layers 412 , 413 of the circuit substrate 410 . Subsequently, the photosensitive substances 421 , 422 are selectively removed through exposure and development processes to expose a portion of the upper copper foil layer 412 , which is not to be removed, thereby forming a portion on which the chip package is to be mounted.
- an etching resistor 423 which is capable of being used as a resistor during a copper etching process using gold or nickel, is applied on the exposed portion of the copper foil layer so as to prevent the copper foil layer from being etched when the copper etching process is conducted using gold or nickel, thereby providing an electric connection to the chip package to be mounted. At this time, it is preferable to form the etching resistor 423 through a plating process.
- the photosensitive substances 421 , 422 are removed from both sides of the copper foil layers 412 , 413 using a stripping process, and photosensitive substances 424 , 425 are further applied to form a circuit as shown in FIG. 4 f.
- the photosensitive substances 424 , 425 are removed through a stripping process, and a plurality of insulating layers 431 , 433 and circuit layers 432 , 434 are further formed.
- a portion of the copper foil which is positioned on such portion of the insulating layer 431 , is removed through a process using a laser or a plasma.
- a portion of the insulating layer 431 is removed through a process, using a laser or a plasma, capable of removing the insulating layer 431 .
- the material of the insulating layer, which is to be removed be different from that of the insulating layer, which must not be removed, so as to prevent the insulating layer, which must not be removed, from being etched.
- photosensitive materials 435 , 436 are applied to form circuits on the outermost layers 432 , 434 .
- the photosensitive materials 435 , 436 are exposed and developed to form circuit patterns thereon. At this stage, a portion of the photosensitive materials 435 , 436 , corresponding in position to an area in which the chip package is to be mounted, is not removed.
- etching resistors 437 , 438 are applied on the circuit patterns formed on the photosensitive materials 435 , 436 using exposure and development processes. At this stage, it is preferable that the application of the etching resistors 437 , 438 be conducted by a plating process.
- the photosensitive materials 435 , 436 are removed so as to form wire patterns on the copper foil using the circuit patterns of the etching resistors 437 , 438 as an etching resist.
- circuits are formed on a surface of the resulting substrate and the copper foils 412 , 413 , 432 , 434 of the internal layer through an etching process employing the etching resistors 437 , 438 as the etching resist.
- the chip package is mounted on the surface of the internal layer of the substrate.
- the etching resistor 423 formed on the internal layer must be removed as shown in FIG. 4 q , the removal may be conducted through an etching resistor stripping process.
- the etching resistor is formed by a gold plating, it is preferable that the etching resistor not be removed.
- FIGS. 5 a to 5 k are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention.
- a circuit substrate 510 acting as a core is provided.
- the circuit substrate 510 is made of an insulating material, and comprises an insulating layer 511 , having a predetermined thickness, and copper foil layers 512 , 513 positioned on upper and lower sides of the insulating layer 511 . Furthermore, a plurality of through holes 514 is formed through the circuit substrate 510 to connect circuits on both sides of the circuit substrate to each other.
- photosensitive substances 521 , 522 are applied on the copper foil layers 512 , 513 of the circuit substrate 510 . Subsequently, circuit patterns are formed on a portion of the photosensitive substances 521 , 522 , corresponding in position to an area in which the chip package is not mounted, through a photolithography process, and another circuit patterns are formed on the copper foil layers 512 , 513 using the photosensitive substances 521 , 522 as an etching resist.
- the photosensitive substances 521 , 522 are removed through a stripping process, and a plurality of insulating layers 531 , 533 and circuit layers 532 , 534 are further formed as shown in FIG. 5 e.
- photosensitive substances 535 , 536 are applied on the outermost layers 532 , 534 .
- the photosensitive substance 535 is exposed and developed to be removed at a portion thereof, corresponding in position to the area in which the chip package is to be mounted. Subsequently, an etching process is conducted to remove a portion of the copper foil layer 532 of the outermost layer, corresponding in position to the area in which the chip package is to be mounted.
- the photosensitive substance 531 is removed by a stripping process as shown in FIG. 5 h . Subsequently, a portion of the insulating layer 531 , corresponding in position to an area in which the chip package is to be mounted, is removed through a process, using a laser or a plasma, capable of removing the insulating layer 531 . Furthermore, photosensitive materials 537 , 538 are applied on a surface of the resulting substrate to form circuits on external layers.
- circuits are formed on the photosensitive materials 537 , 538 through exposure and development processes.
- a portion of the photosensitive materials 537 , 538 may be hardened using radiation that travels very straight, such as UV radiation, X-rays, or a laser.
- the copper foil 532 on a surface of the resulting substrate, and the copper foil 512 of the internal layer, on which the chip package is to be mounted, are simultaneously etched through an etching process employing the photosensitive materials 537 , 538 as an etching resist.
- the chip package is mounted on a surface of the internal layer of the substrate.
- FIGS. 6 a to 6 l are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention.
- a circuit substrate 610 acting as a core is provided.
- the circuit substrate 610 is made of an insulating material, and comprises an insulating layer 611 , having a predetermined thickness, and copper foil layers 612 , 613 positioned on upper and lower sides of the insulating layer 611 . Furthermore, a plurality of through holes 614 is formed through the circuit substrate 610 to connect circuits on both sides of the circuit substrate to each other.
- photosensitive substances 621 , 622 are applied on the copper foil layers 612 , 613 of the circuit substrate 610 .
- circuit patterns are formed on the photosensitive substances 621 , 622 through a photolithography process, and other circuit patterns are then formed on the copper foil layers 612 , 613 using the photosensitive substances 621 , 622 as an etching resist.
- the circuit patterns are formed on a portion of the internal layers 612 , 613 , corresponding in position to an area in which the chip package is to be mounted, and another portion of the internal layers.
- the photosensitive substances 621 , 622 are removed through a stripping process, and a plurality of insulating layers 631 , 633 and circuit layers 632 , 634 is further formed as shown in FIG. 6 f.
- photosensitive substances 635 , 636 are applied on the outermost layers 632 , 634 .
- the photosensitive substance 635 is exposed and developed to be removed at a portion thereof, corresponding in position to the area in which the chip package is to be mounted. Subsequently, an etching process is conducted to remove a portion of the copper foil layer 632 of the outermost layer, corresponding in position to the area in which the chip package is to be mounted.
- the photosensitive substance 635 After the function of the photosensitive substance 635 is completed, the photosensitive substance is removed through a stripping process as shown in FIG. 6 i . Subsequently, as shown in FIG. 6 j , a portion of the insulating layer 631 , corresponding in position to an area in which the chip package is to be mounted, is removed through a process capable of removing the insulating layer 631 using a laser or a plasma.
- photosensitive materials 637 , 638 are applied on a surface of the resulting substrate, and exposure and development processes are then conducted to form circuit patterns on external layers. Since the circuit pattern is already formed on the internal layer 612 , on which the chip package is to be mounted, the circuit patterns are formed on a portion of the external layers, on which the chip package is not to be mounted. At this time, in the exposure process, a portion of the photosensitive materials 637 , 638 , corresponding in position to an area in which the copper foil must not be removed, may be hardened using radiation that travels very straight, such as UV radiation, X-rays, or a laser.
- the chip package is mounted on a surface of the internal layer of the substrate.
- FIGS. 7 a to 7 l are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention.
- a circuit substrate 710 acting as a core is provided.
- the circuit substrate 710 is made of an insulating material, and comprises an insulating layer 711 , having a predetermined thickness, and copper foil layers 712 , 713 positioned on upper and lower sides of the insulating layer 711 . Furthermore, a plurality of through holes 714 is formed through the circuit substrate 710 to connect circuits on both sides of the circuit substrate to each other.
- photosensitive substances 721 , 722 are applied on the copper foil layers 712 , 713 of the circuit substrate 710 .
- circuit patterns are formed on the photosensitive substances 721 , 722 through a photolithography process, and other circuit patterns are then formed on the copper foil layers 712 , 713 using the photosensitive substances 721 , 722 as an etching resist.
- the circuit patterns are formed on a portion of the internal layers 712 , 713 , corresponding in position to an area in which the chip package is to be mounted, and another portion of the internal layers.
- the photosensitive substances 721 , 722 are removed through a stripping process.
- photosensitive substances 723 , 724 are applied to achieve the selective application of an etching resistor 725 .
- the photosensitive substance 723 is exposed and developed to expose a portion on which the etching resistor 725 is to be applied.
- the photosensitive substances 723 , 724 are removed through a stripping process.
- the application of the etching resistor 725 be conducted using a plating process.
- a plurality of insulating layers 726 , 728 and circuit layers 727 , 729 are further formed.
- a portion of the insulating layer 726 in which the chip package is to be mounted, is already removed, and a portion of the copper foil layer 727 , corresponding in position to that portion of the insulating layer, remains. Accordingly, it is unnecessary to etch that portion of the insulating layer 726 to mount the chip package in the insulating layer.
- photosensitive substances 730 , 731 are applied on the outermost layers 727 , 729 to form a circuit pattern on the outermost layer 727 .
- the photosensitive substance 730 is exposed and developed to be removed at a portion thereof, which corresponds in position to the circuit pattern of the outermost layer 727 , so as to form the circuit pattern on the outermost layer 727 .
- a portion of the photosensitive substance 730 corresponding in position to an area in which the chip package is to be mounted, is completely removed.
- an etching process is conducted using the photosensitive substance 730 as an etching resist to remove a portion of the copper foil layer 727 of the outermost layer, corresponding in position to the circuit pattern of the photosensitive substance 730 .
- the photosensitive substance 730 After the function of the photosensitive substance 730 is completed, the photosensitive substance is removed through a stripping process as shown in FIG. 7 l . Thereby, it is possible to mount the chip package on a surface of the internal layer of the substrate.
- FIGS. 8 a to 8 m are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention.
- a circuit substrate 810 acting as a core is provided.
- the circuit substrate 810 is made of an insulating material, and comprises an insulating layer 811 , having a predetermined thickness, and copper foil layers 812 , 813 positioned on upper and lower sides of the insulating layer 811 . Furthermore, a plurality of through holes 814 is formed through the circuit substrate 810 to connect circuits on both sides of the circuit substrate to each other.
- photosensitive substances 821 , 822 are applied on the copper foil layers 812 , 813 of the circuit substrate 810 .
- circuit patterns are formed on the photosensitive substances 821 , 822 through a photolithography process, and other circuit patterns are then formed on the copper foil layers 812 , 813 using the photosensitive substances 821 , 822 as an etching resist.
- the circuit patterns are formed on a portion of the internal layers 812 , 813 , corresponding in position to an area in which the chip package is to be mounted, and another portion of the internal layers.
- the photosensitive substances 821 , 822 are removed through a stripping process.
- photosensitive substances 823 , 824 are applied to achieve the selective application of an etching resistor 825 .
- the photosensitive substance 823 is exposed and developed to expose a portion on which the etching resistor 825 is to be applied.
- the photosensitive substances 823 , 824 are removed through a stripping process.
- the application of the etching resistor 825 be conducted using a plating process.
- a plurality of insulating layers 826 , 827 is further laminated.
- a portion of the insulating layer 826 , in which the chip package is to be mounted, is already removed. Accordingly, it is unnecessary to etch that portion of the insulating layer 826 to mount the chip package in the insulating layer.
- electroless and electrolytic copper plating processes are conducted to form plating layers 828 , 829 .
- photosensitive substances 830 , 831 are applied on the outermost layers 828 , 829 to form circuit patterns on the plating layers 828 , 829 .
- the photosensitive substance 830 is exposed and developed to be removed at a portion thereof, which corresponds in position to the circuit patterns of the plating layers, so as to form the circuit patterns on the plating layers 828 , 829 .
- a portion of the photosensitive substance 830 corresponding in position to an area in which the chip package is to be mounted, is completely removed.
- an etching process is conducted using the photosensitive substance 830 as an etching resist to remove a portion of the copper foil layer 828 of the outermost layer, corresponding in position to the circuit pattern of the photosensitive substance 830 .
- the photosensitive substance 830 After the function of the photosensitive substance 830 is completed, the photosensitive substance is removed through a stripping process as shown in FIG. 8 m . Thereby, it is possible to mount the chip package on a surface of the internal layer of the substrate.
- FIGS. 9 a to 9 d may be further conducted in all the above embodiments of the present invention.
- FIGS. 9 a to 9 c are sectional views illustrating the fabrication of a PCB having an integrated circuit chip mounted thereon according to yet another embodiment of the present invention.
- a solder resist ink 940 is applied to an entire side of a PCB from which a portion of an insulating layer 931 , in which a chip package is to be mounted, is removed according to the procedures of the preceding embodiments.
- solder resist layer 940 formed by the solder resist ink applied to the PCB, is removed at a portion thereof, which corresponds in position to solders 951 of the chip package or shown in FIG. 9 d.
- an electric conductive material or a nonconductive material 942 may be applied on a copper foil layer 912 partially exposed by removing a portion of the solder resist layer 940 of the PCB so as to prevent oxidation of the copper foil layer and to improve adhesion strength between parts to be mounted on the PCB and the copper foil layer.
- the application of the material be conducted through gold plating.
- the chip package 950 is mounted using a flip chip on the PCB.
- the present invention is advantageous in that since a finished chip package is mounted on a PCB, the required degree of cleanliness is reduced, eliminating the necessity for additional devices and costs.
- Another advantage of the present invention is that since it is possible to position a chip closer to an electric power source layer, the occurrence of noise caused by interference can be reduced.
- Still another advantage of the present invention is that connection is feasible through side walls of the package as well as through the bottom of the package because of the use of a lead frame, and thus, it is possible to provide many channels for signal connection.
Abstract
Disclosed is a printed circuit board (PCB) and a method of fabricating the same. A contact portion is formed on an internal layer of the multi-layered PCB. A groove is formed so as to expose the contact portion of the internal layer. A chip package is mounted on the PCB while being flip-chip bonded to the exposed contact portion of the internal layer.
Description
- The present application is a divisional of U.S. patent application Ser. No. 11/128,852, filed May 13, 2005, which claims priority under 35 U.S.C. §119 to Korean Patent Application No. 2004-74872 filed on Sep. 18, 2004. The contents of both applications are incorporated herein by reference in their entirety.
- 1. Field of the Invention
- The present invention relates, in general, to a printed circuit board (PCB) and a method of fabricating the same and, more particularly, to a PCB and a method of fabricating the same, in which a contact portion is formed on an internal layer of the multi-layered PCB, a groove is formed so as to expose the contact portion of the internal layer, and a chip package is mounted on the PCB while being flip-chip bonded to the exposed contact portion of the internal layer.
- 2. Description of the Prior Art
- A semiconductor package is exemplified by a resin seal package, a tape carrier package (TCP), a glass seal package, and a metal seal package. Furthermore, the semiconductor package is classified into a TH-type, in which a hole is formed through a PCB and a pin is inserted into the hole, and a surface mounting technology (SMT) type, in which it is mounted on a surface of a PCB, according to a mounting method thereof.
- The TH-type is the typical integrated circuit (IC) package which has been used for the longest time, and representative examples include a dual inline package (DIP), in which a plurality of pins protrude from both sides of the package in a straight line, and a pin grid array (PGA), in which pins are arranged on the underside of a large hexahedron.
- The SMT-type is a package having a structure in which, when a packaged chip is electrically connected to a substrate, the electric connection is achieved on the substrate unlike the TH-type, in which the pin is inserted into the hole and soldered.
- Compared to the TH-type, the SMT-type is advantageous in that, assuming that chips having the same size are employed, the mounting area is reduced because of the small size, it is thin and lightweight, and operation speed improves with an increase in frequency because of a low parasitic capacitance or inductance.
- Other advantages are that it is unnecessary to form a hole, a soldering region and a pitch can be reduced, it is possible to achieve highly dense wiring and mounting, and the cost of fabricating a PCB can be reduced. However, the SMT-type is disadvantageous in that it is difficult to inspect the appearance of a soldered part.
- Representative examples of the SMT-type package include a quad flat package (QFP), a plastic leaded chip carrier (PLCC), a ceramic leaded chip carrier (CLCC), and a ball grid array (BGA).
- Meanwhile, there are some limits with respect to the size and thickness of a PCB in the course of mounting many parts on the PCB. Recently, demand for slim mobile devices which are handy to carry is growing, and thus, it is necessary to arrange integrated and passive components in a space having a restricted area and height on a surface of the PCB.
- A thin chip may be fabricated to satisfy such a necessity. In this case, however, handling problems and signal interference problems between layers may occur.
- In other words, multiple layers of integrated circuit chips are integrated in one conventional integrated circuit chip package. At this time, the integrated circuit chip must be very thin in order to insert many layers of chips into a package having a restricted thickness. However, since the integrated circuit chip is very thin, it is difficult to handle the chip and signal interference problems between the integrated circuit chips occur.
- Meanwhile, a technology of embedding an integrated circuit chip in a PCB has been suggested to compensate for insufficient space.
- With respect to the above technology, Japanese Pat. Laid-Open Publication No. 11-274734 discloses an electronic circuit device which is provided with a circuit substrate that acts as a core, electronic parts mounted on the circuit substrate, an insulating layer formed on the circuit substrate, and a circuit formed on the insulating layer.
-
FIG. 1 is a sectional view of a conventional PCB having a chip mounted thereon. - Referring to
FIG. 1 , in the conventional PCB having the chip mounted thereon, acircuit substrate 10 is used as a core, andcircuit patterns - A through
hole 13 is formed through thecircuit substrate 10 to connect external and internal circuits to each other. Achip 16 is flip-chip bonded to thecircuit substrate 10 and thus mounted on it. Awelding bump 17 formed on a pad of the integratedcircuit chip 16 is connected to aland 18 on thecircuit substrate 10. - Additionally, a plurality of
insulating layers 22 is laminated on thecircuit substrate 10, and acircuit pattern 25 is formed on each of theinsulating layers 22. - At this stage, an
integrated circuit chip 29 is mounted on an external surface of theoutermost layer 22 of theinsulating layers 22, and connected to a wire pattern on the surface of theoutermost insulating layer 22. - However, in the conventional technology of embedding the integrated circuit chip in the PCB, it is difficult to form a passage for emitting heat, and thus, it is hard to apply the technology to an integrated circuit chip which generates a lot of heat.
- Furthermore, since it is necessary to control occurrence of dust during the fabrication of the PCB to be the same level as that during the fabrication of a semiconductor, undesirably, clean room facilities must be newly installed or the level of dust must be tightly controlled.
- Therefore, the present invention has been made keeping in mind the above disadvantages occurring in the prior arts, and an object of the present invention is to provide a PCB and a method of fabricating the same. In the method, a contact portion, on which a chip package is to be mounted, is formed in the PCB, the lamination of layers is conducted so that the contact portion formed on an internal layer of a substrate is exposed, and the chip package is flip-chip bonded to the contact portion of the internal layer, thereby mounting the thick chip package in a space having a restricted height on a surface of the substrate.
- The above object can be accomplished by providing a PCB having a chip package mounted thereon, which comprises a substrate having a plurality of electric contact portions formed on an upper side thereof and acting as a core. The chip package is mounted on the substrate and has bumps connected to the electric contact portions. An insulating layer is laminated on the substrate and has a hole in which the chip package is to be mounted.
- Furthermore, the present invention provides a method of fabricating a PCB having a chip package mounted thereon. The method includes the steps of forming a first etching resistor to form an electric contact portion on an upper side of a first circuit layer on one side of a substrate; applying a first photosensitive substance on the first circuit layer of the substrate to form a first circuit pattern on the first circuit layer, and removing the first photosensitive substance; laminating an insulating layer and a second circuit layer on the substrate, and forming a hole through a portion of the insulating layer, in which the chip package is to be mounted; applying a second photosensitive substance to form a second circuit pattern on the second circuit layer, and forming the electric contact portion on the exposed first circuit layer of the substrate, on which the first etching resistor is formed; and mounting the chip package so that the chip package is connected to the electric contact portion formed on an exposed internal layer of the substrate.
- Furthermore, the present invention provides a method of fabricating a PCB having a chip package mounted thereon. The method includes the steps of laminating an insulating layer and a first circuit layer on an upper side of a second circuit layer on one side of a substrate, on which a first circuit pattern is formed; removing portions of the insulating layer and the first circuit layer laminated on the substrate, which have a position corresponding to an area in which the chip package is to be mounted; applying a photosensitive substance on internal and external layers so that the photosensitive substance adheres closely to the internal and external layers, and forming a second circuit pattern on the photosensitive substance to form an electric contact portion and to form a third circuit pattern on the external layer; conducting an etching process using the second circuit pattern, formed on the photosensitive substance, to form the third circuit pattern on the external layer and to form the electric contact portion on the internal layer; and mounting the chip package so that the chip package is connected to the electric contact portion formed on the exposed second circuit layer of the substrate.
- Furthermore, the present invention provides a method of fabricating a PCB having a chip package mounted thereon. The method includes the steps of forming a first circuit pattern, which includes an electric contact portion, to be connected to the chip package, on a first circuit layer of a substrate; laminating an insulating layer and a second circuit layer on an upper side of the first circuit layer on one side of the substrate, on which the first circuit pattern is formed; removing portions of the insulating layer and the second circuit layer laminated on the substrate, which have a position corresponding to an area in which the chip package is to be mounted; and mounting the chip package so that the chip package is connected to the electric contact portion formed on the exposed first circuit layer of the substrate.
- Furthermore, the present invention provides a method of fabricating a PCB having a chip package mounted thereon. The method includes the steps of forming a first circuit pattern, which includes an electric contact portion, to be connected to the chip package, on a first circuit layer of a substrate; surrounding the electric contact portion using an etching resistor; laminating an insulating layer, through which a hole is formed so as to mount the chip package therein while the chip package being connected to the electric contact portion, and laminating a second circuit layer on the insulating layer; laminating a photosensitive substance on the second circuit layer, forming a second circuit pattern, of which a portion, having a position corresponding to the hole, is removed, on the photosensitive substance, and etching the resulting substrate to form a third circuit pattern on the second circuit layer; and mounting the chip package so that the chip package is connected to the electric contact portion formed on the exposed first circuit layer of the substrate.
- The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a sectional view of a conventional PCB having a chip mounted thereon; -
FIG. 2 is a sectional view of a PCB having a chip package mounted thereon according to an embodiment of the present invention; -
FIGS. 3 a to 3 p are sectional views illustrating the fabrication of the PCB having the chip package mounted thereon according to an embodiment of the present invention; -
FIGS. 4 a to 4 q are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to a further embodiment of the present invention; -
FIGS. 5 a to 5 k are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention; -
FIGS. 6 a to 6 l are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to a further embodiment of the present invention; -
FIGS. 7 a to 7 l are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention; -
FIGS. 8 a to 8 m are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to a further embodiment of the present invention; and -
FIGS. 9 a to 9 d are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention. - Hereinafter, a detailed description will be given of the present invention with reference to
FIGS. 2 to 9 d. -
FIG. 2 is a sectional view of a PCB having a chip package mounted thereon according to an embodiment of the present invention. - Referring to
FIG. 2 , the PCB having the chip package mounted thereon according to an embodiment of the present invention comprises a copper cladlaminate 210 acting as a core, a plurality of insulatinglayers 231, 233 laminated on the copper cladlaminate 210, a plurality of circuit layers 232, 234, solder resistfilms 240, 241 applied on the external circuit layers 232, 234 and an exposedinternal circuit layer 212, achip package 250, and aconductive material 242 interposed betweenbumps 251 of thechip package 250 and contact portions of theinternal circuit layer 212. - The copper clad
laminate 210 is made of an insulating material, and comprises an insulatinglayer 211 having a predetermined thickness, and copper foil layers 212, 213 positioned on both sides of the insulatinglayer 211 and having circuit patterns. - In this respect, the contact portions, to which the
bumps 251 of thechip package 250 are capable of being flip-chip bonded, are formed on thecopper foil layer 212 on one side of the insulatinglayer 211. The contact portions are electrically connected toother portions 213 throughholes 214. - Additionally, a groove, which corresponds in size to the
chip package 250, is formed on the insulating layer 231 laminated on an upper side of the copper cladlaminate 211 so that thechip package 250 is flip-chip bonded to the contact portions formed in theinternal circuit layer 212. Furthermore, the contact portions of theinternal circuit layer 212 are exposed. - The
chip package 250 is flip-chip bonded through the groove to the contact portions using thebumps 251 attached thereto, thereby being mounted on the PCB. - At this stage, the electric
conductive material 242 may be applied so as to improve the adhesion strength between thebumps 251 of thechip package 250 and the contact portions. - Furthermore, the solder resist may be applied on the external circuit layers 232 and the exposed
internal circuit layer 212. - As well, as shown in
FIG. 2 , a side wall connection is feasible by use of a lead frame, and thus, it is possible to assure many channels for signal connection. -
FIGS. 3 a to 3 p are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to an embodiment of the present invention. - Referring to
FIG. 3 a, acircuit substrate 310 acting as a core is provided. Thecircuit substrate 310 is made of an insulating material, and comprises an insulatinglayer 311, having a predetermined thickness, and copper foil layers 312, 313 positioned on upper and lower sides of the insulatinglayer 311. Furthermore, a plurality of throughholes 314 is formed through thecircuit substrate 310 to connect circuits on both sides of the circuit substrate to each other. - With reference to
FIGS. 3 b and 3 c,photosensitive substances circuit substrate 310. Subsequently, the upperphotosensitive substance 321 is selectively removed through exposure and development processes to expose a portion of thecopper foil layer 312 which is not to be removed, thereby forming a portion on which the chip package is to be mounted. Such a photolithography process may be classified into a photographic process and a screen printing process. Employing an art work film having a circuit pattern printed thereon, the photographic process is divided into a dry film (D/F) process using a dry film as a photosensitive material, and a photosensitive liquid process using photosensitive liquid. - Referring to
FIG. 3 d, anetching resistor 323, which is capable of being used as a resistor during a copper etching process using gold or nickel, is applied on the exposed portion of the copper foil layer so as to prevent the copper foil layer from being etched when the copper etching process is conducted using gold or nickel, thereby providing an electric connection to the chip package to be mounted. At this time, it is preferable to form theetching resistor 323 through a plating process. - Referring to
FIG. 3 e, thephotosensitive substances photosensitive substances FIG. 3 f. - At this time, a portion of the
photosensitive substances FIG. 3 g. - As shown in
FIG. 3 h, after a circuit pattern of the copper foil is formed using circuit patterns of thephotosensitive substances photosensitive substances etching resistor 323 must not be removed. - Next, after an etching process is conducted as shown in
FIG. 3 i to form a circuit on an internal layer, thephotosensitive substances layers circuit layers - As shown in
FIG. 3 j, in order to remove a portion of the insulatinglayer 331, corresponding in position to an area in which the chip package is to be mounted, the copper foil positioned on that portion of the insulatinglayer 331 is removed through a process using a laser or a plasma. - Subsequently, after a portion of the copper foil, corresponding in position to an area in which the chip package is to be mounted, is removed as shown in
FIG. 3 k, a portion of the insulatinglayer 331, also corresponding in position to the area in which the chip package is to be mounted, is removed through a process, using a laser or a plasma, capable of removing the insulatinglayer 331. At this time, if necessary, it is preferable to control the removal of the insulating layer so as to prevent the resulting substrate from being excessively removed. Additionally, it is preferable that a material of the insulating layer, which is to be removed, be different from that of the insulating layer, which must not be removed, so as to prevent the insulating layer, which must not be removed, from being etched. - As shown in
FIG. 31 ,photosensitive materials outermost layers - As shown in
FIG. 3 m, thephotosensitive materials photosensitive materials internal layer 312, corresponding in position to an area in which the chip package is to be mounted, is removed by a copper etching process. - As shown in
FIG. 3 n, wire patterns are formed on the external circuit layers 332, 334 and the exposed internalcopper foil layer 312 using the circuit patterns of thephotosensitive materials etching resistor 323 as an etching resist. In other words, circuits are formed on a surface of the resulting substrate and the copper foils 312, 332, 334 of the internal layer through the etching process. - As shown in
FIG. 3 o, after thephotosensitive materials etching resistor 323 formed on the internal layer must be removed, the removal may be conducted through an etching resistor stripping process as shown inFIG. 3 p. However, if the etching resistor is formed by gold plating, it is preferable that the etching resistor be not removed. -
FIGS. 4 a to 4 q are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention. - Referring to
FIG. 4 a, acircuit substrate 410 acting as a core is provided. Thecircuit substrate 410 is made of an insulating material, and comprises an insulatinglayer 411, having a predetermined thickness, and copper foil layers 412, 413 positioned on upper and lower sides of the insulatinglayer 411. Furthermore, a plurality of throughholes 414 is formed through thecircuit substrate 410 to connect circuits on both sides of the circuit substrate to each other. - With reference to
FIGS. 4 b and 4 c,photosensitive substances circuit substrate 410. Subsequently, thephotosensitive substances copper foil layer 412, which is not to be removed, thereby forming a portion on which the chip package is to be mounted. - Referring to
FIG. 4 d, anetching resistor 423, which is capable of being used as a resistor during a copper etching process using gold or nickel, is applied on the exposed portion of the copper foil layer so as to prevent the copper foil layer from being etched when the copper etching process is conducted using gold or nickel, thereby providing an electric connection to the chip package to be mounted. At this time, it is preferable to form theetching resistor 423 through a plating process. - Referring to
FIG. 4 e, thephotosensitive substances photosensitive substances FIG. 4 f. - At this stage, a portion of the
photosensitive substances FIG. 4 g. - As shown in
FIG. 4 h, after a circuit pattern of the copper foil is formed using circuit patterns of thephotosensitive substances photosensitive substances - Next, after an etching process is conducted as shown in
FIG. 4 i to form a circuit on an internal layer, thephotosensitive substances layers circuit layers - As shown in
FIG. 4 j, in order to remove a portion of the insulatinglayer 431 corresponding in position to an area in which the chip package is to be mounted, a portion of the copper foil, which is positioned on such portion of the insulatinglayer 431, is removed through a process using a laser or a plasma. - Subsequently, after a portion of the copper foil, corresponding in position to an area in which the chip package is to be mounted, is removed as shown in
FIG. 4 k, a portion of the insulatinglayer 431, corresponding in position to an area in which the chip package is to be mounted, is removed through a process, using a laser or a plasma, capable of removing the insulatinglayer 431. At this stage, if necessary, it is preferable to control the removal of the insulating layer so as to prevent the resulting substrate from being excessively removed. Additionally, it is preferable that the material of the insulating layer, which is to be removed, be different from that of the insulating layer, which must not be removed, so as to prevent the insulating layer, which must not be removed, from being etched. - As shown in
FIG. 41 ,photosensitive materials outermost layers - As shown in
FIG. 4 m, thephotosensitive materials photosensitive materials - As shown in
FIG. 4 n, etchingresistors 437, 438 are applied on the circuit patterns formed on thephotosensitive materials etching resistors 437, 438 be conducted by a plating process. - As shown in
FIG. 4 o, thephotosensitive materials etching resistors 437, 438 as an etching resist. - As shown in
FIG. 4 p, after thephotosensitive materials etching resistors 437, 438 as the etching resist. - As shown in
FIG. 4 q, after theetching resistors 437, 438 are completely removed through a stripping process, the chip package is mounted on the surface of the internal layer of the substrate. In case that theetching resistor 423 formed on the internal layer must be removed as shown inFIG. 4 q, the removal may be conducted through an etching resistor stripping process. However, if the etching resistor is formed by a gold plating, it is preferable that the etching resistor not be removed. -
FIGS. 5 a to 5 k are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention. - Referring to
FIG. 5 a, acircuit substrate 510 acting as a core is provided. Thecircuit substrate 510 is made of an insulating material, and comprises an insulatinglayer 511, having a predetermined thickness, and copper foil layers 512, 513 positioned on upper and lower sides of the insulatinglayer 511. Furthermore, a plurality of throughholes 514 is formed through thecircuit substrate 510 to connect circuits on both sides of the circuit substrate to each other. - With reference to
FIGS. 5 b and 5 c,photosensitive substances circuit substrate 510. Subsequently, circuit patterns are formed on a portion of thephotosensitive substances photosensitive substances - As shown in
FIG. 5 d, thephotosensitive substances layers circuit layers FIG. 5 e. - As shown in
FIG. 5 f, in order to remove a portion of the insulatinglayer 531, corresponding in position to an area in which the chip package is to be mounted,photosensitive substances outermost layers - As shown in
FIG. 5 g, in order to remove a portion of the insulatinglayer 531, corresponding in position to an area in which the chip package is to be mounted, thephotosensitive substance 535 is exposed and developed to be removed at a portion thereof, corresponding in position to the area in which the chip package is to be mounted. Subsequently, an etching process is conducted to remove a portion of thecopper foil layer 532 of the outermost layer, corresponding in position to the area in which the chip package is to be mounted. - After the function of the
photosensitive substance 531 is completed, the photosensitive substance is removed by a stripping process as shown inFIG. 5 h. Subsequently, a portion of the insulatinglayer 531, corresponding in position to an area in which the chip package is to be mounted, is removed through a process, using a laser or a plasma, capable of removing the insulatinglayer 531. Furthermore,photosensitive materials 537, 538 are applied on a surface of the resulting substrate to form circuits on external layers. - As shown in
FIG. 5 i, circuits are formed on thephotosensitive materials 537, 538 through exposure and development processes. At this time, in the exposure process, a portion of thephotosensitive materials 537, 538, corresponding in position to an area in which the copper foil must not be removed, may be hardened using radiation that travels very straight, such as UV radiation, X-rays, or a laser. - As well, as shown in
FIG. 5 j, thecopper foil 532 on a surface of the resulting substrate, and thecopper foil 512 of the internal layer, on which the chip package is to be mounted, are simultaneously etched through an etching process employing thephotosensitive materials 537, 538 as an etching resist. - As shown in
FIG. 5 k, after the photosensitive materials are completely removed through a stripping process, the chip package is mounted on a surface of the internal layer of the substrate. -
FIGS. 6 a to 6 l are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention. - Referring to
FIG. 6 a, acircuit substrate 610 acting as a core is provided. Thecircuit substrate 610 is made of an insulating material, and comprises an insulatinglayer 611, having a predetermined thickness, and copper foil layers 612, 613 positioned on upper and lower sides of the insulatinglayer 611. Furthermore, a plurality of throughholes 614 is formed through thecircuit substrate 610 to connect circuits on both sides of the circuit substrate to each other. - With reference to
FIGS. 6 b to 6 d,photosensitive substances circuit substrate 610. Subsequently, circuit patterns are formed on thephotosensitive substances photosensitive substances internal layers - As shown in
FIG. 6 e, thephotosensitive substances layers circuit layers FIG. 6 f. - As shown in
FIG. 6 g, in order to remove a portion of the insulatinglayer 631, corresponding in position to an area in which the chip package is to be mounted,photosensitive substances outermost layers - As shown in
FIG. 6 h, in order to remove a portion of the insulatinglayer 631, corresponding in position to an area in which the chip package is to be mounted, thephotosensitive substance 635 is exposed and developed to be removed at a portion thereof, corresponding in position to the area in which the chip package is to be mounted. Subsequently, an etching process is conducted to remove a portion of thecopper foil layer 632 of the outermost layer, corresponding in position to the area in which the chip package is to be mounted. - After the function of the
photosensitive substance 635 is completed, the photosensitive substance is removed through a stripping process as shown inFIG. 6 i. Subsequently, as shown inFIG. 6 j, a portion of the insulatinglayer 631, corresponding in position to an area in which the chip package is to be mounted, is removed through a process capable of removing the insulatinglayer 631 using a laser or a plasma. - As shown in
FIG. 6 k,photosensitive materials internal layer 612, on which the chip package is to be mounted, the circuit patterns are formed on a portion of the external layers, on which the chip package is not to be mounted. At this time, in the exposure process, a portion of thephotosensitive materials - As shown in
FIG. 6 l, after thecopper foil 632 on a surface of the resulting substrate is etched through an etching process employing thephotosensitive materials -
FIGS. 7 a to 7 l are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention. - Referring to
FIG. 7 a, acircuit substrate 710 acting as a core is provided. Thecircuit substrate 710 is made of an insulating material, and comprises an insulatinglayer 711, having a predetermined thickness, and copper foil layers 712, 713 positioned on upper and lower sides of the insulatinglayer 711. Furthermore, a plurality of throughholes 714 is formed through thecircuit substrate 710 to connect circuits on both sides of the circuit substrate to each other. - With reference to
FIGS. 7 b to 7 d,photosensitive substances circuit substrate 710. Subsequently, circuit patterns are formed on thephotosensitive substances photosensitive substances internal layers - As shown in
FIG. 7 e, thephotosensitive substances - As shown in
FIG. 7 f,photosensitive substances etching resistor 725. - As shown in
FIG. 7 g, thephotosensitive substance 723 is exposed and developed to expose a portion on which theetching resistor 725 is to be applied. - As shown in
FIG. 7 h, after theetching resistor 725 is applied, thephotosensitive substances etching resistor 725 be conducted using a plating process. - As shown in
FIG. 7 i, a plurality of insulatinglayers circuit layers layer 726, in which the chip package is to be mounted, is already removed, and a portion of thecopper foil layer 727, corresponding in position to that portion of the insulating layer, remains. Accordingly, it is unnecessary to etch that portion of the insulatinglayer 726 to mount the chip package in the insulating layer. - As shown in
FIG. 7 j,photosensitive substances outermost layers outermost layer 727. - As shown in
FIG. 7 k, thephotosensitive substance 730 is exposed and developed to be removed at a portion thereof, which corresponds in position to the circuit pattern of theoutermost layer 727, so as to form the circuit pattern on theoutermost layer 727. At this stage, a portion of thephotosensitive substance 730, corresponding in position to an area in which the chip package is to be mounted, is completely removed. - Furthermore, an etching process is conducted using the
photosensitive substance 730 as an etching resist to remove a portion of thecopper foil layer 727 of the outermost layer, corresponding in position to the circuit pattern of thephotosensitive substance 730. - After the function of the
photosensitive substance 730 is completed, the photosensitive substance is removed through a stripping process as shown inFIG. 7 l. Thereby, it is possible to mount the chip package on a surface of the internal layer of the substrate. -
FIGS. 8 a to 8 m are sectional views illustrating the fabrication of a PCB having a chip package mounted thereon according to another embodiment of the present invention. - Referring to
FIG. 8 a, acircuit substrate 810 acting as a core is provided. Thecircuit substrate 810 is made of an insulating material, and comprises an insulatinglayer 811, having a predetermined thickness, and copper foil layers 812, 813 positioned on upper and lower sides of the insulatinglayer 811. Furthermore, a plurality of throughholes 814 is formed through thecircuit substrate 810 to connect circuits on both sides of the circuit substrate to each other. - With reference to
FIGS. 8 b to 8 d,photosensitive substances circuit substrate 810. Subsequently, circuit patterns are formed on thephotosensitive substances photosensitive substances internal layers - As shown in
FIG. 8 e, thephotosensitive substances - As shown in
FIG. 8 f,photosensitive substances etching resistor 825. - As shown in
FIG. 8 g, thephotosensitive substance 823 is exposed and developed to expose a portion on which theetching resistor 825 is to be applied. - As shown in
FIG. 8 h, after theetching resistor 825 is applied, thephotosensitive substances etching resistor 825 be conducted using a plating process. - As shown in
FIG. 8 i, a plurality of insulatinglayers layer 826, in which the chip package is to be mounted, is already removed. Accordingly, it is unnecessary to etch that portion of the insulatinglayer 826 to mount the chip package in the insulating layer. - As shown in
FIG. 8 j, electroless and electrolytic copper plating processes are conducted to form platinglayers - As shown in
FIG. 8 k,photosensitive substances 830, 831 are applied on theoutermost layers - As shown in
FIG. 81 , thephotosensitive substance 830 is exposed and developed to be removed at a portion thereof, which corresponds in position to the circuit patterns of the plating layers, so as to form the circuit patterns on the plating layers 828, 829. At this time, a portion of thephotosensitive substance 830, corresponding in position to an area in which the chip package is to be mounted, is completely removed. - Furthermore, an etching process is conducted using the
photosensitive substance 830 as an etching resist to remove a portion of thecopper foil layer 828 of the outermost layer, corresponding in position to the circuit pattern of thephotosensitive substance 830. - After the function of the
photosensitive substance 830 is completed, the photosensitive substance is removed through a stripping process as shown inFIG. 8 m. Thereby, it is possible to mount the chip package on a surface of the internal layer of the substrate. - Meanwhile, a process of
FIGS. 9 a to 9 d may be further conducted in all the above embodiments of the present invention. -
FIGS. 9 a to 9 c are sectional views illustrating the fabrication of a PCB having an integrated circuit chip mounted thereon according to yet another embodiment of the present invention. - Referring to
FIG. 9 a, a solder resistink 940 is applied to an entire side of a PCB from which a portion of an insulatinglayer 931, in which a chip package is to be mounted, is removed according to the procedures of the preceding embodiments. - With reference to
FIG. 9 b, a solder resistlayer 940, formed by the solder resist ink applied to the PCB, is removed at a portion thereof, which corresponds in position to solders 951 of the chip package or shown inFIG. 9 d. - As shown in
FIG. 9 c, an electric conductive material or anonconductive material 942 may be applied on acopper foil layer 912 partially exposed by removing a portion of the solder resistlayer 940 of the PCB so as to prevent oxidation of the copper foil layer and to improve adhesion strength between parts to be mounted on the PCB and the copper foil layer. At this stage, it is preferable that the application of the material be conducted through gold plating. - As shown in
FIG. 9 d, thechip package 950 is mounted using a flip chip on the PCB. - The fabrication of a PCB of the present invention has been described in an illustrative manner, and it is to be understood that the terminology used is intended to be in the nature of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
- As described above, the present invention is advantageous in that since a finished chip package is mounted on a PCB, the required degree of cleanliness is reduced, eliminating the necessity for additional devices and costs.
- Another advantage of the present invention is that since it is possible to position a chip closer to an electric power source layer, the occurrence of noise caused by interference can be reduced.
- Still another advantage of the present invention is that connection is feasible through side walls of the package as well as through the bottom of the package because of the use of a lead frame, and thus, it is possible to provide many channels for signal connection.
Claims (9)
1. A method of fabricating a printed circuit board having a chip package mounted thereon, comprising the steps of:
laminating an insulating layer and a first circuit layer wherein a first circuit pattern is formed on an upper side of a second circuit layer on one side of a substrate;
removing portions of the insulating layer and the first circuit layer laminated on the substrate having a position corresponding to an area in which the chip package is mounted;
applying a photosensitive substance on internal and external layers so that the photosensitive substance adheres closely to the internal and external layers, and forming a second circuit pattern on the photosensitive substance to form an electric contact portion and to form a third circuit pattern on the external layer;
conducting an etching process using the second circuit pattern to form the third circuit pattern on the external layer and to form the electric contact portion on the internal layer; and
mounting the chip package wherein the chip package is connected to the electric contact portion formed on the exposed second circuit layer of the substrate.
2. The method as set forth in claim 1 , further comprising the steps of:
applying a solder resistor on an outermost circuit layer and an exposed portion of the internal layer, and etching the electric contact portion to remove it; and
forming a conductive material on an area having a position corresponding to the removed electric contact portion, after the step of applying a second photosensitive substance.
3. The method as set forth in claim 1 , further comprising the step of connecting a side wall of the chip package through a lead frame to an external circuit layer after the step of mounting the chip package.
4. A method of fabricating a printed circuit board having a chip package mounted thereon, comprising the steps of:
forming a first circuit pattern, on a first circuit layer of a substrate having an electric contact portion to be connected to the chip package;
laminating an insulating layer and a second circuit layer on an upper side of the first circuit layer on one side of the substrate wherein the first circuit pattern is formed;
removing portions of the insulating layer and the second circuit layer, laminated on the substrate, having a position corresponding to an area wherein the chip package is to be mounted; and
mounting the chip package wherein the chip package is connected to the electric contact portion formed on the exposed first circuit layer of the substrate.
5. The method as set forth in claim 4 , further comprising the steps of:
applying a solder resistor on an outermost circuit layer and an exposed portion of an internal layer, and etching the electric contact portion to remove it; and
forming a conductive material on an area having a position corresponding to the removed electric contact portion, after the step of removing portions of the insulating layer and the second circuit layer.
6. The method as set forth in claim 4 , further comprising the step of connecting a side wall of the chip package through a lead frame to an external circuit layer after the step of mounting the chip package.
7. A method of fabricating a printed circuit board having a chip package mounted thereon, comprising the steps of:
forming a first circuit pattern on a first circuit layer of a substrate having an electric contact portion connected to the chip package;
surrounding the electric contact portion with an etching resistor;
laminating an insulating layer and forming a hole wherein the chip package connected to the electric contact portion is mounted, and laminating a second circuit layer on the insulating layer;
laminating a photosensitive substance on the second circuit layer, forming a second circuit pattern on the photosensitive substance wherein a portion, having a position corresponding to the hole, is removed, and etching the resulting substrate to form a third circuit pattern on the second circuit layer; and
mounting the chip package wherein the chip package is connected to the electric contact portion formed on the exposed first circuit layer of the substrate.
8. The method as set forth in claim 7 , further comprising the steps of:
applying a solder resistor on an outermost circuit layer and an exposed portion of an internal layer, and etching the electric contact portion to remove it; and
forming a conductive material on an area which has a position corresponding to the removed electric contact portion, after the step of laminating a photosensitive substance on the second circuit layer.
9. The method as set forth in claim 7 , further comprising the step of connecting a side wall of the chip package through a lead frame to an external circuit layer after the step of mounting the chip package.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/367,738 US20090152233A1 (en) | 2004-09-18 | 2009-02-09 | Printed circuit board having chip package mounted thereon and method of fabricating same |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2004-0074872 | 2004-09-18 | ||
KR1020040074872A KR20060026130A (en) | 2004-09-18 | 2004-09-18 | Printed circuit board mounted chip-package and method for fabricating printed circuit board |
US11/128,852 US7506437B2 (en) | 2004-09-18 | 2005-05-13 | Printed circuit board having chip package mounted thereon and method of fabricating same |
US12/367,738 US20090152233A1 (en) | 2004-09-18 | 2009-02-09 | Printed circuit board having chip package mounted thereon and method of fabricating same |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/128,852 Division US7506437B2 (en) | 2004-09-18 | 2005-05-13 | Printed circuit board having chip package mounted thereon and method of fabricating same |
Publications (1)
Publication Number | Publication Date |
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US20090152233A1 true US20090152233A1 (en) | 2009-06-18 |
Family
ID=36073070
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US11/128,852 Expired - Fee Related US7506437B2 (en) | 2004-09-18 | 2005-05-13 | Printed circuit board having chip package mounted thereon and method of fabricating same |
US12/367,738 Abandoned US20090152233A1 (en) | 2004-09-18 | 2009-02-09 | Printed circuit board having chip package mounted thereon and method of fabricating same |
US12/367,768 Abandoned US20090147488A1 (en) | 2004-09-18 | 2009-02-09 | Printed circuit board having chip package mounted thereon and method of fabricating same |
Family Applications Before (1)
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US11/128,852 Expired - Fee Related US7506437B2 (en) | 2004-09-18 | 2005-05-13 | Printed circuit board having chip package mounted thereon and method of fabricating same |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US12/367,768 Abandoned US20090147488A1 (en) | 2004-09-18 | 2009-02-09 | Printed circuit board having chip package mounted thereon and method of fabricating same |
Country Status (3)
Country | Link |
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US (3) | US7506437B2 (en) |
KR (1) | KR20060026130A (en) |
CN (1) | CN1750737A (en) |
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Also Published As
Publication number | Publication date |
---|---|
US20060060960A1 (en) | 2006-03-23 |
CN1750737A (en) | 2006-03-22 |
US7506437B2 (en) | 2009-03-24 |
US20090147488A1 (en) | 2009-06-11 |
KR20060026130A (en) | 2006-03-23 |
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