WO1998038634A2 - Sandwich labeled compact disc for optical recording - Google Patents
Sandwich labeled compact disc for optical recording Download PDFInfo
- Publication number
- WO1998038634A2 WO1998038634A2 PCT/US1998/003852 US9803852W WO9838634A2 WO 1998038634 A2 WO1998038634 A2 WO 1998038634A2 US 9803852 W US9803852 W US 9803852W WO 9838634 A2 WO9838634 A2 WO 9838634A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- disc
- layer
- compact disc
- compact
- blockout
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title description 5
- 238000007639 printing Methods 0.000 claims abstract description 17
- 229920003023 plastic Polymers 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000004922 lacquer Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims 2
- 239000012790 adhesive layer Substances 0.000 claims 1
- 230000013011 mating Effects 0.000 abstract description 5
- 238000007650 screen-printing Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 206010073261 Ovarian theca cell tumour Diseases 0.000 description 1
- 229920001800 Shellac Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 1
- 229940113147 shellac Drugs 0.000 description 1
- 235000013874 shellac Nutrition 0.000 description 1
- 239000004208 shellac Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 208000001644 thecoma Diseases 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
- G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
Definitions
- This invention relates to the assembly line printing of information on compact discs during their manufacture in an on-line process. In particular, it relates to printing of logos on such discs.
- Compact discs are optical recording media that are read by a laser through one transparent surface of the disc.
- the optical data are pits that are too small to be seen by unaided eye, although they cause some diffraction that is visible.
- the data is recorded in a spiral from an inside radius outwardly, beginning a certain distance from a central hole in the disc.
- the pits are preferably formed during an injection molding process which results in a disc having a pitted data surface and a smooth read through surface. A portion of the data of the pitted surface is illuminated by a laser reading beam through the smooth surface during the playing of the compact disc.
- a metallic or other reflective layer is deposited on the pitted surface to enhance the reflection of the laser light.
- a protective layer of shellac is coated which forms the hard exterior for the non-playing surface of the compact disc.
- a logo is printed, typically by screen printing, which may involve many steps and employ several different colors to enhance the appearance of the disc. Printing is usually accomplished by multiple print heads and/or multiple passes through the print- ing station of an assembly line. A mechanized printing system for such discs is disclosed in U.S. patent 5,520,106 to Autoroll Machine Corporation.
- the Sandwich Label Compact Disc provides a disc where the printed logo is protected from the environment by one of the plastic layers of the CD. This also provides an enhanced glossy appearance like a framed picture under glass.
- the preparation of such a disc is accomplished by printing the mirror image of the desired logo on the mating clear disc prior to bonding. The logo is then viewed through the clear surface of the disc, upon which surface it is not then necessary to perform any further printing.
- CD is used generically to include any optical record- ing format such as CD-ROM, DVD, etc.
- Figure l is a top view of a portion of a prior art printing system for silk screen printing of compact discs.
- Figure 2 is a radial cross section of a compact disc according to the present invention.
- Figure 3 is a view of the printed surface of one portion of the compact disc before bonding to its mating surface.
- Figure 4 is a view of the compact disc through the top surface.
- FIG. 1 depicts a printing station for an assembly line making compact discs. Using such an assembly line the blank covering (i.e., mat- ing) disc is printed with the mirror image of the desired logo.
- Figure 2 shows the cross section of a compact disc according to the present invention.
- Lower disc half 1 is formed by injection molding and has a data recording surface 3. in which the data is recorded as a series of pits and lands in a spiral pattern.
- a metallic coating 5 is deposited to enhance reflectivity. This coating has a pitted exterior surface substantially congruent to the underlying data surface.
- the data recording surface 3. is viewed from below through the clear surface 1_ of the lower disc half 1.
- This lower disc half is bonded to the upper disc half.
- the lower half comprises a protective lacquer layer .10, and a layer of adhesive 9. bonding it to the upper disc half
- upper disc half 11 has a layer of printing ink ⁇ on a transparent layer 15..
- the image is formed preferably with UV curable ink comprising an acrylic base and pigment.
- the printed image is preferably formed by offset printing, rather than screen printing to provide a flatter, more uniform surface. This is overcoated by screening with a white blockout _ ⁇ _ to assure greater surface thickness uniformity and to inhibit bleeding of the ink into the adhesive and vice versa. It is not required that the layer of printing 13 extend to the periphery of the transparent layer 15.
- the upper disc half shown in Fig. 3 is then inverted to form the disc half as shown in Fig. 4 which is bonded to form the upper portion of the compact disc 12 shown in Figure 2. Since the adhesive 9, faces the printed layer 13.
- the adhesive not degrade the logo and that the material forming the logo not adversely affect the adhesive either by chemical degradation or physically, by reducing the bonding force between the two layers of the compact disc. This is accomplished by the various protective layers which have substantial adhesion to the disc and to the bonding material so that the disc remains strongly integral.
- the forces between the layers of the disc tending to separate the two layers are significant and could permit deformation of the surface of the disc due to temperature differences which will impede the reading of the discs.
Abstract
A compact disc where the printed logo (13) is protected from the environment by one of the plastic layers of the CD. The disc is made by printing the mirror image of the desired logo (13) on the mating clear disc prior to bonding. The logo (13) is then viewed through the clear surface (15) of the disc, upon which surface it is not then necessary to perform any further printing.
Description
SANDWICH LABELED COMPACT DISC FOR OPTICAL RECORDING
FIELD OF THE INVENTION This invention relates to the assembly line printing of information on compact discs during their manufacture in an on-line process. In particular, it relates to printing of logos on such discs.
BACKGROUND OF THE INVENTION Compact discs are optical recording media that are read by a laser through one transparent surface of the disc. The optical data are pits that are too small to be seen by unaided eye, although they cause some diffraction that is visible. The data is recorded in a spiral from an inside radius outwardly, beginning a certain distance from a central hole in the disc. During manufacture the pits are preferably formed during an injection molding process which results in a disc having a pitted data surface and a smooth read through surface. A portion of the data of the pitted surface is illuminated by a laser reading beam through the smooth surface during the playing of the compact disc. A metallic or other reflective layer is deposited on the pitted surface to enhance the reflection of the laser light.
Over this metallic layer a protective layer of shellac is coated which forms the hard exterior for the non-playing surface of the compact disc. -Onto this surface a logo is printed, typically by screen printing, which may involve many steps and employ several different colors to enhance the appearance of the disc. Printing is usually accomplished by multiple print heads and/or multiple passes through the print- ing station of an assembly line. A mechanized printing system for such discs is disclosed in U.S. patent 5,520,106 to Autoroll Machine Corporation.
It is also known to manufacture compact discs of exceptional data density by forming very small pits having dimensions of the order of 250nm. In order to read the data from such pits the distance of such pits from the clear surface of the disc is also reduced to 0.6mm. This thin disc structure is required so that the coma of the laser spot image on the data structure (i.e. pits and lands) is less affected by variations in the tilt of the data surface. A thinner disc therefore enhances the ability of the reading beam to clearly discern the edges of the individual pits and allow a greater density of data to be encoded on the disc. The resulting disc structure component
is so thin that a separate blank (equally thin) mating disc is bonded to it to form the final disc in order to provide greater stability to the composite object.
BRIEF DESCRIPTION OF THE INVENTION The Sandwich Label Compact Disc provides a disc where the printed logo is protected from the environment by one of the plastic layers of the CD. This also provides an enhanced glossy appearance like a framed picture under glass. The preparation of such a disc is accomplished by printing the mirror image of the desired logo on the mating clear disc prior to bonding. The logo is then viewed through the clear surface of the disc, upon which surface it is not then necessary to perform any further printing.
It is an object of the present invention to provide a compact disc in which the printed logo is protected against the environment and from scratching.
It is a further object of the present invention to provide a compact disc in which the printed logo is viewed through a covering transparent layer without adversely affecting the mechanical properties of the disc necessary for reading in CD viewers. (The term CD is used generically to include any optical record-
ing format such as CD-ROM, DVD, etc.)
It is a further object of the present invention to provide a method for the inline assembly line production of such CD's without significantly increasing the cost of production of the CD.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure l is a top view of a portion of a prior art printing system for silk screen printing of compact discs.
Figure 2 is a radial cross section of a compact disc according to the present invention. Figure 3 is a view of the printed surface of one portion of the compact disc before bonding to its mating surface.
Figure 4 is a view of the compact disc through the top surface.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Figure 1 depicts a printing station for an assembly line making compact discs. Using such an assembly line the blank covering (i.e., mat- ing) disc is printed with the mirror image of the desired logo. Figure 2 shows the cross section of a compact disc according to the present invention. Lower disc half 1 is formed by
injection molding and has a data recording surface 3. in which the data is recorded as a series of pits and lands in a spiral pattern. On top- of the surface 3. a metallic coating 5 is deposited to enhance reflectivity. This coating has a pitted exterior surface substantially congruent to the underlying data surface. The data recording surface 3. is viewed from below through the clear surface 1_ of the lower disc half 1. This lower disc half is bonded to the upper disc half. The lower half comprises a protective lacquer layer .10, and a layer of adhesive 9. bonding it to the upper disc half
11. As shown in Figure 3, upper disc half 11 has a layer of printing ink ϋ on a transparent layer 15.. The image is formed preferably with UV curable ink comprising an acrylic base and pigment. The printed image is preferably formed by offset printing, rather than screen printing to provide a flatter, more uniform surface. This is overcoated by screening with a white blockout _Λ_ to assure greater surface thickness uniformity and to inhibit bleeding of the ink into the adhesive and vice versa. It is not required that the layer of printing 13 extend to the periphery of the transparent layer 15. The upper disc half shown in Fig. 3
is then inverted to form the disc half as shown in Fig. 4 which is bonded to form the upper portion of the compact disc 12 shown in Figure 2. Since the adhesive 9, faces the printed layer 13. it is required that the adhesive not degrade the logo and that the material forming the logo not adversely affect the adhesive either by chemical degradation or physically, by reducing the bonding force between the two layers of the compact disc. This is accomplished by the various protective layers which have substantial adhesion to the disc and to the bonding material so that the disc remains strongly integral.
The forces between the layers of the disc tending to separate the two layers are significant and could permit deformation of the surface of the disc due to temperature differences which will impede the reading of the discs.
While there have been shown and described and pointed out the fundamental novel features of the invention as applied to preferred embodiments thereof, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from
the spirit of the invention.
Claims
1. A compact disc comprising upper and lower disc halves, said lower disc half comprising from bottom to top a clear viewing surface, a data recording surface, a metallic coating layer, and a protective lacquer layer, said upper disc half comprising from bottom to top a blockout layer, a layer of printing ink, an upper transparent layer an adhesive layer bonding together said upper and lower disc halves to form said compact disc.
2. The compact disc of claim 1, wherein said blockout layer provides uniform thickness to said upper disc half.
3. The compact disc of claim 1, wherein said layer of printing ink comprises a mirror image of a label viewable as a positive image through said clear viewing surface.
4. A method for the manufacture of a compact disc having a clear plastic surface through which is viewed a printed label, comprising, preparation of a first disc structure comprising a clear viewing surface, a data recording surface, and a metallic coating layer, coating said disc structure with a protective lacquer layer to form a lower disc half, , preparation of a second disc structure by coating upon a transparent plastic layer a blockout layer, and a layer of printing ink, to form an upper disc half, applying an adhesive to one of said disc halves, contacting said disc halves to cause them to adhere, wherein said layer of printing ink is viewable through said transparent plastic layer.
5. The method for the manufacture of a co - pact disc of claim 4 wherein said blockout layer is applied to render uniform the thickness of said second disc structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU64420/98A AU6442098A (en) | 1997-02-28 | 1998-02-27 | Sandwich labeled compact disc for optical recording |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80821397A | 1997-02-28 | 1997-02-28 | |
| US08/808,213 | 1997-02-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998038634A2 true WO1998038634A2 (en) | 1998-09-03 |
| WO1998038634A3 WO1998038634A3 (en) | 1998-12-03 |
Family
ID=25198197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1998/003852 WO1998038634A2 (en) | 1997-02-28 | 1998-02-27 | Sandwich labeled compact disc for optical recording |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU6442098A (en) |
| WO (1) | WO1998038634A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030029462A (en) * | 2001-10-03 | 2003-04-14 | 소니 가부시끼 가이샤 | Optical information medium |
| EP1515336A2 (en) * | 2003-09-11 | 2005-03-16 | DOCdata Germany Berlin Optical Disc GmbH | Optical information carrier |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3689078A (en) * | 1969-06-30 | 1972-09-05 | Yasujiro Ban | Colored recording discs |
| JPS57143701A (en) * | 1981-03-02 | 1982-09-06 | Victor Co Of Japan Ltd | Disk |
| US5470691A (en) * | 1993-04-10 | 1995-11-28 | Taiyo Yuden, Co., Ltd. | Optical information medium |
| US5729533A (en) * | 1995-09-12 | 1998-03-17 | Wae Manufacturing Inc. | Two-sided, light-readable information recording disc stacks and methods of making same |
-
1998
- 1998-02-27 WO PCT/US1998/003852 patent/WO1998038634A2/en active Application Filing
- 1998-02-27 AU AU64420/98A patent/AU6442098A/en not_active Abandoned
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3689078A (en) * | 1969-06-30 | 1972-09-05 | Yasujiro Ban | Colored recording discs |
| JPS57143701A (en) * | 1981-03-02 | 1982-09-06 | Victor Co Of Japan Ltd | Disk |
| US5470691A (en) * | 1993-04-10 | 1995-11-28 | Taiyo Yuden, Co., Ltd. | Optical information medium |
| US5729533A (en) * | 1995-09-12 | 1998-03-17 | Wae Manufacturing Inc. | Two-sided, light-readable information recording disc stacks and methods of making same |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030029462A (en) * | 2001-10-03 | 2003-04-14 | 소니 가부시끼 가이샤 | Optical information medium |
| EP1304691A2 (en) * | 2001-10-03 | 2003-04-23 | Sony Corporation | Optical information medium |
| EP1304691A3 (en) * | 2001-10-03 | 2004-04-28 | Sony Corporation | Optical information medium |
| US6951027B2 (en) * | 2001-10-03 | 2005-09-27 | Sony Corporation | Optical information medium |
| US7080391B2 (en) | 2001-10-03 | 2006-07-18 | Sony Corporation | Optical information medium |
| EP1515336A2 (en) * | 2003-09-11 | 2005-03-16 | DOCdata Germany Berlin Optical Disc GmbH | Optical information carrier |
| EP1515336A3 (en) * | 2003-09-11 | 2007-09-12 | DOCdata Germany Berlin Optical Disc GmbH | Optical information carrier |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6442098A (en) | 1998-09-18 |
| WO1998038634A3 (en) | 1998-12-03 |
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