WO2004021018A1 - 異方導電性シートおよびインピーダンス測定用プローブ - Google Patents
異方導電性シートおよびインピーダンス測定用プローブ Download PDFInfo
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- WO2004021018A1 WO2004021018A1 PCT/JP2003/010748 JP0310748W WO2004021018A1 WO 2004021018 A1 WO2004021018 A1 WO 2004021018A1 JP 0310748 W JP0310748 W JP 0310748W WO 2004021018 A1 WO2004021018 A1 WO 2004021018A1
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- conductive
- sheet
- anisotropic conductive
- conductive sheet
- anisotropic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R3/00—Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments, e.g. of probe tips
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/06772—High frequency probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/073—Multiple probes
- G01R1/07307—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card
- G01R1/0735—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card arranged on a flexible frame or film
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
- H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
- H01R13/22—Contacts for co-operating by abutting
- H01R13/24—Contacts for co-operating by abutting resilient; resiliently-mounted
- H01R13/2407—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means
- H01R13/2414—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means conductive elastomers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/073—Multiple probes
- G01R1/07307—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card
- G01R1/07357—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with flexible bodies, e.g. buckling beams
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/01—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the form or arrangement of the conductive interconnection between the connecting locations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
- H01R11/18—End pieces terminating in a probe
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2201/00—Connectors or connections adapted for particular applications
- H01R2201/20—Connectors or connections adapted for particular applications for testing or measuring purposes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
Definitions
- the present invention relates to an anisotropic conductive sheet used for measuring the characteristic impedance of a printed wiring circuit on a printed wiring board in a high-frequency region, and measuring an electrical characteristic of a high-frequency semiconductor device, and an impedance measurement using the anisotropic conductive sheet.
- An anisotropic conductive sheet used for measuring the characteristic impedance of a printed wiring circuit on a printed wiring board in a high-frequency region, and measuring an electrical characteristic of a high-frequency semiconductor device, and an impedance measurement using the anisotropic conductive sheet.
- the characteristic impedance of a printed wiring circuit formed by signal lines is matched with the characteristic impedance of another printed wiring circuit electrically connected to the printed wiring circuit.
- it is required to match the characteristic impedance of the printed wiring circuit with the impedance of a circuit load electrically connected to the printed wiring circuit.
- the TDR (Time Domain Refrectrometry) method has been used to measure the impedance of a printed wiring circuit on a printed wiring board.
- This method transmits a pulse signal or a step signal to a transmission circuit consisting of a signal circuit (circuit under test) to be measured and a reference ground circuit, and detects a reflected signal in the transmission circuit.
- the impedance value (characteristic impedance) of the transmission circuit (circuit under test) is obtained using the reflection coefficient obtained from the reflected signal.
- a prop when transmitting a signal to a transmission circuit, a prop is used as an intermediary for electrically connecting a cable derived from a signal source and the transmission circuit.
- Such an impedance measurement probe includes a contact bin for a circuit under test for making contact with a circuit to be measured and a contact bin for a ground circuit for making contact with a ground circuit.
- a macrostrip structure formed by sandwiching a plate-like dielectric layer between a contact bin and a ground circuit contact pin, and an inner conductor and an outer conductor arranged in a coaxial line shape, It is roughly divided into two types: one that draws out the contact bin for the circuit under test from the conductor and one that draws out the contact bin for the dull circuit from the external conductor.
- the tip of the contact pin for the circuit to be measured and the tip of the contact pin for the ground circuit are connected to the signal circuit and the durand circuit, which are the circuit to be measured, respectively. Impedance measurement is performed by simultaneously making contact with the contact.
- the pointed contact pins must be printed and pressed against the signal and ground circuits on the board. As a result, a conductive state is formed, which may damage the printed wiring board during impedance measurement.
- the metal contact bins are brought into contact with the signal circuit and ground circuit of the printed wiring board, there is a problem that the contact between the impedance measurement probe and the printed wiring board is unstable and measurement reliability is low. It was difficult to measure the impedance accurately with the impedance measurement probe.
- the operating clock frequency of devices for connecting to computers is expected to continue to increase in the future, and the miniaturization and density of electronic components are expected to further increase. Accompanying this, it is thought that the importance of accurately measuring the characteristic impedance will further increase in order to ensure the quality of the printed wiring board.However, some conventional impedance measurement probes may not meet such requirements. May not be able to respond.
- contact stabilization is used as a member for achieving electrical connection.
- the conventionally known anisotropic conductive sheet has problems such as a large transmission loss when used in a high frequency region, and therefore, sufficient characteristics are obtained in impedance measurement in a high frequency region. And practically difficult to use.
- a first object of the present invention is to provide an anisotropic conductive material that can be used for impedance measurement in a high-frequency region of 1 GHz or more, particularly in a high-frequency region of 10 GHz or more.
- a second object of the present invention is to suppress the occurrence of damage to a substrate to be measured during impedance measurement in a high frequency region of 1 GHz or more, particularly in a high frequency region of 10 GHz or more, and to perform high measurement.
- An object of the present invention is to provide a probe for impedance measurement that can obtain reliability.
- the anisotropic conductive sheet according to the first aspect of the present invention comprises a sheet base made of an elastic polymer material, in which conductive particles exhibiting magnetism are dispersed in a plane direction and are oriented so as to be aligned in a thickness direction.
- An anisotropic conductive sheet comprising:
- the thickness is 10 to 100 ⁇ m
- the number average particle diameter of the conductive particles showing magnetism is 5 to 50 m
- the thickness and the number average particle diameter D of the conductive particles showing magnetism are
- the ratio ZD is 1.1 to 10 and the content ratio of conductive particles exhibiting magnetism is 10 to 40% by weight, and is used for impedance measurement in a high frequency region. I do.
- a conductive substance having no magnetism is contained in a uniformly dispersed state.
- the anisotropic conductive sheet according to the second aspect of the present invention comprises: a sheet base made of an elastic polymer material; and a plurality of conductive portions extending in a thickness direction in which conductive particles exhibiting magnetism are densely contained; An anisotropic conductive sheet formed with an insulating portion that insulates portions from each other,
- the thickness of the conductive portion is a 1 0 ⁇ 1 0 0 ⁇ m, with a number average particle diameter of the conductive particles exhibiting magnetism is 5 ⁇ 5 0 ⁇ m, the conductive showing the thickness W 2 and the magnetic conductive portion The number of particles
- the ratio W 2 ZD to the average particle diameter D is 1:!
- To 10 and the content ratio of conductive particles showing magnetism in the conductive portion is 10 to 40% by weight fraction. It is used for impedance measurement in the high frequency range.
- the anisotropic conductive sheet according to the second aspect of the present invention it is preferable that a conductive substance having no magnetism is contained in a state where the conductive substance and the insulating part are uniformly dispersed.
- the anisotropic conductive sheet according to the second aspect of the present invention includes a conductive part connected to a circuit to be measured on a substrate to be measured of a probe for impedance measurement, and a conductive part connected to a ground circuit of the substrate to be measured. May be separated by an insulating portion.
- a probe for impedance measurement according to the present invention includes the above-described anisotropically conductive and raw sheet, and is used in a high-frequency region.
- the anisotropic conductive sheet of the present invention is an anisotropic conductive sheet used for measuring impedance in a high frequency region, and has conductive particles exhibiting magnetism (hereinafter, also referred to as “magnetic conductive particles”) and elasticity. And a substrate made of a molecular substance. Specifically, it is an anisotropic conductive sheet having the following configurations (1) and (2).
- a sheet base made of an elastic polymer substance, in which magnetic conductive particles are dispersed in the plane direction and contained in a state of being aligned so as to line up in the thickness direction (hereinafter referred to as “first type Also referred to as “electrically conductive sheet”.)
- a plurality of conductive portions that are densely filled with magnetic conductive particles and extend in the thickness direction and an insulating portion that insulates the conductive portions from each other are formed in a sheet base made of an elastic polymer material.
- the magnetic conductive particles constituting the anisotropic conductive sheet of the present invention have a number average particle diameter of 5 to 50 ⁇ . Is required.
- the number average particle diameter of the magnetic conductive particles is preferably from 6 to 30 ⁇ m, and particularly preferably from 8 to 20 ⁇ m.
- the “number average particle size of the magnetic conductive particles” refers to a value measured by a laser diffraction scattering method.
- the resulting anisotropic conductive sheet can easily undergo pressure deformation of a portion containing the magnetic conductive particles, and In the manufacturing process, magnetic conductive particles are arranged by magnetic field orientation treatment.
- the anisotropic conductive sheet obtained has high anisotropy, and in particular, the anisotropic conductive sheet in which the magnetic conductive particles are uniformly dispersed in the surface direction in the sheet substrate has a high resolution. (Insulation between test electrodes for measuring impedance adjacent in the horizontal direction during pressurization conduction) is improved.
- the obtained anisotropic conductive sheet has good elasticity, and particularly in the second anisotropic conductive sheet. Can easily form a fine conductive portion.
- saturation magnetization 0. l Wb / m 2 or more can be preferably used ones, and more preferably 0. 3 W b / m 2 or more, preferably especially those of 0. 5 Wb Zm 2 or more.
- the saturation magnetization is 0.1 Wb / m 2 or more
- the magnetic conductive particles can be surely moved by the action of a magnetic field in the manufacturing process to obtain a desired orientation state.
- a conductive sheet is used, a chain of magnetic conductive particles can be formed.
- the magnetic conductive particles include particles of a metal exhibiting magnetism such as iron, nickel, and cobalt, or particles of an alloy thereof, or particles containing these metals, or these particles as core particles.
- a core particle is a composite particle in which the surface of a core particle is coated with a highly conductive metal, or an inorganic substance particle such as a non-magnetic metal particle or a glass bead or a polymer particle is a core particle.
- the composite particles include a plated composite particle and a core particle coated with both a conductive magnetic material such as ferrite and an intermetallic compound and a highly conductive metal.
- highly conductive metal refers to a metal having a conductivity of 5 ⁇ 10 6 ⁇ 1 or more at 0 ° C.
- a highly conductive metal specifically, gold, silver, rhodium, platinum, chromium, and the like can be used.
- gold is chemically stable and has high conductivity.
- composite particles in which nickel particles are used as core particles and the surface thereof is coated with a highly conductive metal such as gold or silver is preferred.
- Means for coating the surface of the core particles with a highly conductive metal is not particularly limited, but for example, an electroless plating method can be used.
- the magnetic conductive particles preferably have a coefficient of variation of the number average particle diameter of 50% or less, more preferably 40% or less, still more preferably 30% or less, and particularly preferably 20% or less. % Or less.
- the “variation coefficient of the number average particle diameter” is expressed by the following formula: ( ⁇ / D n) X 100 (where ⁇ is the value of the standard deviation of the particle diameter, and D n is the number of particles) Indicates the average particle size.
- Such magnetic conductive particles can be obtained by converting a metal material into particles by an ordinary method, or preparing commercially available metal particles and subjecting the particles to a classification treatment. It can be obtained by:
- the classification of the particles can be performed by a classifier such as an air classifier or a sonic sieve.
- the specific conditions of the classification treatment are appropriately set according to the number average particle diameter of the target conductive metal particles, the type of the classification device, and the like.
- the specific shape of the magnetic conductive particles is not particularly limited, but a shape composed of secondary particles formed by integrally connecting a plurality of spherical primary particles is preferable. They can be mentioned as particles.
- a composite particle in which the surface of a core particle is coated with a highly conductive metal (hereinafter also referred to as “conductive composite metal particle”) is used as the magnetic conductive particle, good conductivity is obtained.
- the coverage of the highly conductive metal on the surface of the conductive composite metal particles is 40% or more. It is preferably 45% or more, more preferably 47% to 95%.
- the coating amount of the highly conductive metal is preferably a Dearuko 2.5 to 50 wt% of the weight of the core particles, more preferably 3 to 45 mass 0/0, more preferably 3.5 to 40 mass %, Particularly preferably 5 to 30% by mass.
- the conductive composite metal particles preferably have a thickness t force S of 10 nm or more, more preferably 10 to 100 nm, of the coating layer made of a highly conductive metal, which is calculated by the following equation.
- t is the thickness of the coating layer (m)
- Sw is the BET specific surface area of the conductive composite metal particles (m z kg)
- p is the specific gravity of the highly conductive metal (kg / m 3 )
- N is the coating layer Shows the coverage (weight of highly conductive metal constituting the coating layer / weight of conductive composite metal particles).
- the conductive composite metal particles When the thickness t of the coating layer is 10 nm or more, the conductive composite metal particles have high conductivity, and the anisotropic conductive sheet using the conductive composite metal particles as magnetic conductive particles is In addition, it is less likely that the coating layer is peeled off due to a temperature change, pressure, or the like, and the conductivity is reduced.
- the conductive composite metal particles may be those whose surfaces have been treated with a coupling agent such as a silane coupling agent.
- the adhesion between the conductive composite metal particles and the elastic polymer material is increased, and as a result, the resulting anisotropic conductive sheet is improved. ! / Has durability.
- the amount of the coupling agent used is appropriately selected within a range that does not affect the conductivity of the conductive composite metal particles.
- the coating ratio of the coupling agent on the surface of the conductive composite metal particles (the conductive composite metal particles Is preferably 5% or more, more preferably 7% to 100%, further preferably 10% to 100%, and particularly preferably 20% to 100%. Amount It is.
- the content ratio of the magnetic conductive particles is from 10 to 40% by weight, particularly preferably from 15 to 30% by weight.
- the content ratio of the magnetic conductive particles is less than 10%, it is difficult for the anisotropic conductive sheet to obtain a low inductance property in the measurement system in the impedance measurement.
- the transmission loss is hard to lower in particular 1 Inpidansu measurement of GH Z over high-frequency region.
- the anisotropic conductive sheet tends to be weakened due to its reduced bowability, and the impedance of the anisotropic conductive sheet is measured during the impedance measurement.
- the substrate is easily damaged.
- the content ratio of the magnetic conductive particles in the conductive portion is 10 to 40% by weight, and preferably 15 to 30%.
- the anisotropic conductive sheet does not easily obtain a low inductance property in the impedance measurement in the impedance measurement, and particularly the impedance measurement in a high frequency region of 1 GHz or more. In, transmission loss is not likely to be low.
- the conductive portion of the anisotropic conductive sheet has low elasticity and tends to be fragile, so that when the impedance is measured, the conductive portion of the printed wiring board or the like is damaged.
- the measurement substrate is easily damaged.
- the elastic polymer material constituting the sheet substrate of the anisotropically conductive sheet of the present invention is preferably a cured product of liquid rubber, and the force and the liquid rubber include liquid silicone rubber and liquid polyurethane rubber. Can be used. Of these, liquid silicone rubber is preferred.
- 'As a liquid silicone rubber of polymeric substance-forming material preferably has the following 1 0 5 poise at its viscosity strain rate 1 0 one 1 sec, that of the condensation type, those of the addition type, bi - Le group or a hydroxyl It may be a deviation such as one containing a group.
- dimethyl silicone raw rubber methyl butyl silicone raw rubber, Tilphenylbutylsilicone raw rubber and the like can be mentioned.
- liquid silicone rubber containing a butyl group (polymethylsiloxane containing a butyl group) is usually prepared by converting dimethyldimethoxysilane or dimethyldialkoxysilane in the presence of dimethylbicycle or dimethylbialkoxysilane. , Hydrolysis and condensation, for example, followed by fractionation by repeated dissolution-precipitation.
- liquid silicone rubbers containing a butyl group at both ends are polymerized with a cyclic siloxane such as otatamethylcyclotetrasiloxane in the presence of a catalyst, and dimethyldibutylsiloxane is used as a polymerization terminator. It can be obtained by appropriately selecting the reaction conditions (for example, the amount of the cyclic siloxane and the amount of the polymerization terminator).
- a catalyst for the a-one polymerization an alcohol such as tetramethylammonium hydroxide and n-butylphosphonium hydroxide or a silanolate solution thereof can be used. It is 80 to 130 ° C.
- liquid silicone rubber containing hydroxyl groups usually hydrolyzes dimethyldichlorosilane or dimethyldialkoxysilane in the presence of dimethylhydrochlorosilane or dimethylhydroalkoxysilane. It can be obtained by allowing a condensation reaction to take place, for example, followed by fractionation by repeating dissolution-precipitation.
- the liquid silicone rubber containing hydroxyl groups is prepared by polymerization of cyclic siloxane in the presence of a catalyst in the form of a union, and using a polymerization terminator such as dimethylhydrochlorosilane, methinoresidrochlorosilane or dimethinolehydranolexoxysilane.
- the reaction conditions for example, the amount of the cyclic siloxane and the amount of the polymerization terminator
- alkali such as tetramethylammonium hydroxide and n-butylphosphonium hydroxide or a silanolate solution thereof can be used.
- the reaction temperature is, for example, 80%. ⁇ 130 ° C.
- Such an elastic polymer substance has a molecular weight Mw (weight average in terms of standard polystyrene). Refers to average molecular weight. ), Preferably those of 100 000 to 400 000. From the viewpoint of the heat resistance of the obtained first anisotropic conductive sheet, the molecular weight distribution index (refers to the value of the ratio Mw / Mn of the weight average molecular weight Mw in terms of standard polystyrene and the number average molecular weight Mn in terms of standard polystyrene). ) But those with 2 or less are preferred.
- a sheet molding material for forming an anisotropic conductive sheet by a production method described below which contains a polymer substance forming material and magnetic conductive particles for obtaining the anisotropic conductive sheet of the present invention.
- the composition may contain a curing catalyst for curing the polymer-forming material.
- an organic peroxide As such a curing catalyst, an organic peroxide, a fatty acid azo compound, a hydrosilylation catalyst, or the like can be used.
- organic peroxide used as a curing catalyst examples include benzoyl peroxide, bisdicyclobenzoyl peroxide, dicumyl peroxide, and ditertiary peroxide.
- fatty acid azo compound used as a curing catalyst examples include azobisisobutyronitrile and the like.
- the amount of the curing catalyst to be used is appropriately selected in consideration of the type of the polymer substance-forming material, the type of the curing catalyst, and other curing conditions, but is usually based on 100 parts by mass of the polymer substance-forming material. 3 to 15 parts by mass.
- the anisotropic conductive sheet of the present invention may include a conductive material that does not exhibit magnetism (hereinafter, also referred to as “non-magnetic conductive material”).
- the non-magnetic conductive material is contained in a state of being uniformly dispersed, and in the second anisotropic conductive sheet, It is contained in the conductive part and the insulating part constituting the anisotropic conductive sheet of No. 2 in a state of being uniformly dispersed.
- the non-magnetic conductive material is added to the polymer material forming material before the curing treatment so as to be contained in the anisotropic conductive sheet obtained by molding so as to be uniformly dispersed in both the surface direction and the thickness direction. be able to.
- Such a non-magnetic conductive material has an effect of preventing the anisotropic conductive sheet from being charged by adding an appropriate amount thereof without impairing the anisotropic conductivity in the obtained anisotropic conductive sheet. .
- the anisotropic conductive sheet In the case where the anisotropic conductive sheet is prevented from being charged by the effect of the nonmagnetic conductive material, when the impedance measurement using the anisotropic conductive sheet is repeatedly performed, the anisotropic conductive sheet may be charged. It is possible to prevent the measurement result from being adversely affected due to the electrification of the conductive sheet.
- Non-magnetic conductive substances include substances that exhibit conductivity themselves (hereinafter, also referred to as “self-conductive substances”) and substances that exhibit conductivity by absorbing moisture (hereinafter, “hygroscopic conductive substances”). ) Etc. can be used.
- the self-conducting substance includes a substance that exhibits conductivity by a metal bond, a substance that causes a charge to move due to the movement of surplus electrons, a substance that causes a charge to move due to the movement of vacancies, A substance that generates ions and carries charges, a substance that has ⁇ bonds along the main chain and shows conductivity by the interaction, and a substance that causes charge transfer by the interaction of groups in the side chain It can be used by selecting from among others.
- Substances that generate ions exemplified as one type of self-conductive substance are sometimes collectively referred to as surfactants.
- the conductivity can be controlled by doping with metal ions. .
- the moisture-absorbing conductive substance is preferably a substance having high hygroscopicity, and more preferably a substance having a highly polar group such as a hydroxyl group or an ester group.
- silicon compounds such as chloropolysiloxane, alkoxysilane, alkoxypolysilane, and alkoxypolysiloxane; polymer substances such as conductive urethane, polyvinyl alcohol or a copolymer thereof; higher alcohol ethylene oxide; Alcohol-based surfactants such as polyethylene glycol fatty acid esters and polyhydric alcohol fatty acid esters, and polysaccharides can be used.
- a preferable one is an aliphatic sulfonate.
- the aliphatic sulfonic acid salts it is particularly preferable to use a metal salt of an alkyl sulfonic acid.
- the obtained anisotropic conductive sheet is imparted with appropriate conductivity and has a good antistatic effect.
- the metal salt of alkyl sulfonic acid has excellent thermal stability, so that the antistatic effect is stable even when the anisotropic conductive sheet is repeatedly used for impedance measurement in a high frequency range. can get.
- the metal salt of the alkyl sulfonic acid a salt of an alkali metal is preferable.
- alkali metal salts include: Sodium perdecane sulfonate, sodium 1-dodecane sulfonate, sodium 1-tridecane sulfonate, sodium 1-tetradecane sulfonate, sodium 1-pentadecane sulfonate, sodium 1-hexadecane sulfonate, 1-heptadecane Sodium sulfonate, sodium 1-octadecanesulfonic acid, sodium 1-nonadecanesulfonic acid, 1-sodium eicosandecanesulfonate, 1 potassium monodecanesulfonate, 1-potassium 1-decanecansulfonate, 1- Potassium dodecanesulfonate, Potassium tridecanesulfonate, Potassium tetradecanesulfonate, Potassium 1-pentadecanesulfonate, Potassium 1-hexadecanesulfon
- sodium salt is particularly preferred because of its excellent heat resistance.
- These compounds may be used as a mixture of two or more kinds.
- the content ratio of the metal salt of alkylsulfonic acid is preferably in the range of 0.1 to 30% by mass in the polymer material constituting the sheet base material.
- the sheet molding material may contain an inorganic filler such as ordinary silica powder, colloidal silica, air-port gel silica, alumina, and diamond powder, if necessary.
- the anisotropic conductive sheet By appropriately containing such an inorganic filler, the thixotropy of the sheet forming material is ensured, the viscosity thereof is increased, and the dispersion stability of the magnetic conductive particles is improved, and the obtained anisotropic material is obtained.
- the strength of the conductive sheet increases. Further, by appropriately improving the hardness of the surface of the anisotropic conductive sheet, the anisotropic conductive sheet can obtain an effect of improving durability against repeated use in impedance measurement. .
- the use amount of such an inorganic filler is not particularly limited, but when used in a large amount, the orientation state of the magnetic conductive particles cannot be brought into a desired state by a magnetic field. Not preferred.
- the viscosity of the sheet molding material is 25. In C, it is preferably within the range of 100 000 000 to 100 000 cp.
- FIG. 1 is an explanatory cross-sectional view showing a configuration of an example of the anisotropic conductive sheet according to the first present invention.
- the magnetic conductive particles P are uniformly dispersed in the plane direction and oriented in the thickness direction in a sheet base made of an elastic polymer material. It is contained in a state.
- Such a first anisotropic conductive sheet 10 can be manufactured, for example, by the following method.
- a flowable sheet molding material in which the magnetic conductive particles P and a non-magnetic conductive material used as needed are dispersed in a polymer material forming material that becomes a sheet substrate by curing treatment is prepared. As shown in FIG. 2, this sheet molding material is injected into a mold 20 to form a sheet molding material layer 10A.
- the mold 20 is configured such that an upper mold 21 and a lower mold 22 each made of a rectangular ferromagnetic plate are opposed to each other via a rectangular frame-shaped spacer 23. And a cavity is formed between the lower surface of the upper die 21 and the upper surface of the lower die 22 It is.
- an electromagnet or a permanent magnet is arranged on the upper surface of the upper mold 21 and the lower surface of the lower mold 22, and a parallel magnetic field is applied to the sheet molding material layer 1 OA in the mold 20 in the thickness direction.
- a parallel magnetic field is applied to the sheet molding material layer 1 OA in the mold 20 in the thickness direction.
- the magnetic conductive particles P dispersed in the sheet molding material layer are in a state of being dispersed in the plane direction as shown in FIG. It is oriented so as to line up in the thickness direction while maintaining.
- the nonmagnetic conductive substance is dispersed in the sheet forming material layer 1OA even when a parallel magnetic field acts. It is in the state as it was.
- the sheet forming material layer 10A is cured so that the magnetic conductive particles P are aligned in the thickness direction in the sheet base made of an insulating elastic polymer material.
- the first anisotropic conductive sheet 10 is obtained.
- the intensity of the parallel magnetic field applied to the sheet molding material layer 10A has a magnitude of 0.02 to 1.5 T on average.
- the permanent magnet When a parallel magnetic field is applied in the thickness direction of the sheet forming material layer 10 A by the permanent magnet, the permanent magnet can have a parallel magnetic field strength within the above range. It is preferable to use an alloy composed of Ni—Co alloy), ferrite, or the like.
- the curing treatment of the sheet forming material layer 10A can be performed while the parallel magnetic field is applied, but can also be performed after the application of the parallel magnetic field is stopped.
- the curing treatment of the sheet molding material layer 1OA is appropriately selected depending on the material used, but is usually performed by a heating treatment.
- the specific heating temperature and heating time are appropriately set in consideration of the type of the material for forming the polymer substance constituting the sheet molding material layer 1OA, the time required for the movement of the magnetic conductive particles P, and the like.
- the first anisotropic conductive sheet 10 is required to have a thickness of 10 to 10 ° ⁇ m.
- the anisotropic conductive sheet has low elasticity Therefore, when the anisotropic conductive sheet is arranged between the inspection object such as a printed wiring board and the inspection electrode and pressurized to achieve the contact conduction state, the inspection object is easily damaged.
- an anisotropically conductive 1 "raw sheet is placed between the inspection object such as a printed wiring board and the inspection electrode to apply pressure and to establish a contact and conductive state.
- the distance between the object to be inspected and the inspection electrode increases, and it is difficult for the transmission loss to decrease in the impedance measurement in the high-frequency region, specifically, in the high-frequency region of 1 GHz or more.
- the ratio ZD of the thickness (/ zm) to the number average particle diameter D ( ⁇ ) of the magnetic conductive particles is 1.1 to: L0. Something is needed.
- the ratio ZD is less than 1.1
- the diameter of the magnetic conductive particles is equal to or larger than the thickness of the anisotropic conductive sheet. Therefore, when the anisotropic conductive sheet is arranged between a test object such as a printed wiring board and the test electrode to apply pressure and achieve a contact conductive state, the test object Is easily damaged.
- an anisotropic conductive sheet is placed between the inspection object such as a printed wiring board and the inspection electrode to apply pressure and achieve a contact conduction state.
- the inspection object such as a printed wiring board
- the inspection electrode to apply pressure and achieve a contact conduction state.
- a large number of conductive particles are arranged between the object to be inspected and the inspection electrode to form a chain. Therefore, since a large number of conductive particles are in contact with each other, a high frequency region, In general, transmission loss is unlikely to be low when measuring impedance in the high frequency region above 1 GHz.
- FIG. 4 is an explanatory cross-sectional view showing a configuration of an example of the anisotropic conductive sheet according to the second invention.
- the second anisotropic conductive sheet 40 includes a plurality of conductive portions 11 extending in the thickness direction in which magnetic conductive particles are densely contained in a sheet base made of an elastic polymer material, and It comprises an insulating portion 12 made of a sheet base material made of an elastic polymer material, which insulates the portions 11 from each other.
- the conductive portion 11 is formed so as to protrude from both surfaces of the insulating portion 12.
- Such a second anisotropic conductive sheet 40 can be manufactured, for example, as follows.
- FIG. 5 is an explanatory cross-sectional view showing a configuration of an example of a mold used for manufacturing the second anisotropically conductive raw sheet 40.
- This mold is configured such that an upper mold 50 and a lower mold 55 corresponding thereto are arranged so as to face each other via a frame-shaped spacer 54, and the lower surface and the lower surface of the upper mold 50 are arranged. Cavity is formed between the mold 55 and the upper surface.
- a ferromagnetic layer 52 is formed on the lower surface of the substrate 51 in accordance with a pattern opposite to the arrangement pattern of the conductive portions 11 of the target anisotropic conductive sheet 40.
- a non-magnetic layer 53 having a thickness larger than the thickness of the ferromagnetic layer 52 is formed in a portion other than the magnetic layer 52.
- a ferromagnetic layer 57 is formed on the upper surface of the substrate 56 according to the same pattern as the arrangement pattern of the conductive portions 11 of the target anisotropic conductive sheet 40, A non-magnetic layer 58 having a thickness greater than the thickness of the ferromagnetic layer 57 is formed in a portion other than the ferromagnetic layer 57.
- a polymer that becomes a sheet substrate by a curing treatment is formed in the mold by using such a mold and performing the same forming method as the anisotropic conductive sheet of the first invention.
- the sheet forming material layer 4 OA is formed by injecting a flowable sheet forming material in which the magnetic conductive particles P and the non-magnetic conductive material used as needed are dispersed in the material forming material, and the upper mold 5 is formed.
- an electromagnet or a permanent magnet is arranged on the upper surface of the lower mold 55 and the lower surface of the lower mold 55, and a parallel magnetic field is applied to the sheet molding material layer 4OA in the mold in the thickness direction.
- the sheet forming material layer 40A includes the ferromagnetic layer of the upper mold 50 and the corresponding ferromagnetic material layer of the lower mold 55, as shown in FIG. Since a magnetic field having a higher intensity is applied to the portion between the portions 5 and 7, the magnetic conductive particles P dispersed in the sheet forming material layer 4OA have a large magnetic field.
- Set 1 1 A And in this state, a plurality of conductive portions 11 extending in the thickness direction, in which the magnetic conductive particles P are densely contained in a sheet base made of an elastic polymer substance, A second anisotropic conductive sheet 40 comprising an insulating portion 12 that insulates the conductive portions 11 from each other is obtained.
- the thickness of the conductive portion 11 needs to be 10 to 100 m.
- the thickness of the conductive portion 11 exceeds 100 m, an anisotropic conductive sheet is placed between the test object such as a printed wiring board and the test electrode to apply pressure and to conduct contact.
- the distance between the inspection electrodes and the object to be inspected is increased, the high-frequency region, the transmission loss in Inpidansu measured over 1 GH Z in the high frequency region in particular lower Nikure ,.
- the ratio W 2 between the thickness W 2 ( ⁇ .) Of the conductive portion 11 and the number average particle diameter D ( ⁇ ) of the magnetic conductive particles It is required that ZD be 1.
- the diameter of the magnetic conductive particles becomes equal to or larger than the thickness of the conductive portion of the anisotropic conductive sheet.
- the conductive part has low elasticity. Therefore, when the anisotropic conductive sheet is placed between the inspection object such as a printed wiring board and the inspection electrode to apply pressure and achieve a contact conductive state. In addition, the inspection object is easily damaged.
- the anisotropic conductive sheet is placed between the inspection object such as a printed wiring board and the inspection electrode, and pressure is applied to make the V ⁇ contact conductive state.
- the inspection object such as a printed wiring board
- pressure is applied to make the V ⁇ contact conductive state.
- a large number of conductive particles are arranged between the object to be inspected and the inspection electrode to form a chain. Therefore, since there are many points of contact between the conductive particles, high frequency Region, specifically for impedance measurement in the high frequency region above 1 GHz. And transmission loss is not easily reduced.
- the anisotropic conductive sheet of the present invention is not limited to the above embodiment, and various changes can be made.
- the second anisotropic conductive sheet has a cylindrical conductive portion, a cylindrical shape having an inner diameter larger than the conductive portion K, and a coaxial shape with the conductive portion K. It may be provided with two conductive portions including a conductive portion G in a shape of a circle.
- the conductive part K is a conductive part connected to the measurement circuit of the impedance measuring probe main body
- the conductive part G is the ground of the impedance measuring probe main body. It is a conductive part connected to a circuit for circuit connection.
- These conductive portions K and G constituting the anisotropic conductive sheet 80 contain magnetic conductive particles densely, and the conductive portions K and G are separated by the insulating portion N. Electrically insulated.
- FIG. 10 is an explanatory conceptual diagram showing the impedance measuring probe of the present invention in which the anisotropic conductive sheet 80 shown in FIGS. 8 and 9 is provided in the impedance measuring probe main body.
- the impedance measuring probe 120 has a cylindrical measuring circuit 121, a cylindrical ground circuit having an inner diameter larger than that of the measuring circuit 122, and having a coaxial shape with the measuring circuit 122.
- the probe has a connection circuit 122, and has an impedance measurement probe main body 120A having a columnar overall shape, and an anisotropic conductive sheet 80.
- the end surface of the conductive portion K on one side (the lower surface in FIG. 10) of the anisotropically conductive 1 "raw sheet 80 is the measuring circuit of the impedance measuring probe body 12 OA.
- One end of the conductive portion G on one side is connected to a ground circuit connection circuit 122 of the impedance measurement probe main body 12 OA.
- the anisotropic conductive sheet 80 has a conductive part K having a diameter suitable for the measuring circuit 121 and a conductive part G having a diameter suitable for the ground circuit connecting circuit 122. are doing.
- the impedance measurement probe 120 provided with the anisotropic conductive sheet 80 is provided on the opposite side to one surface of the anisotropic conductive sheet 80 connected to the impedance measuring probe body 120 A.
- the surface (the upper surface in Fig. 10) of the anisotropic conductive sheet 80 is contacted with the printed circuit board to be measured and pressurized through the conductive parts (conductive part K and conductive part G) of the anisotropic conductive sheet 80.
- the circuit to be measured on the printed wiring board is connected to the probe measurement circuit for impedance measurement 12 1 OA, and the reference ground circuit on the printed circuit board II and the measurement circuit for impedance measurement 1 2 OA
- the connection is established by connecting the ground circuit connection circuit 122 to the ground circuit, and impedance measurement is performed.
- FIG. 1 is an explanatory cross-sectional view showing a configuration of an example of the anisotropic conductive sheet according to the first present invention.
- FIG. 2 is an explanatory cross-sectional view showing a state in which a sheet forming material layer is formed in a mold for manufacturing an anisotropic conductive sheet according to the first invention.
- FIG. 3 is an explanatory cross-sectional view showing a state in which a parallel magnetic field is applied in a thickness direction to a sheet forming material layer formed in a mold for manufacturing an anisotropic conductive sheet according to the first present invention.
- FIG. 4 is an explanatory cross-sectional view showing a configuration of an example of the anisotropic conductive sheet according to the second invention.
- FIG. 5 is an explanatory cross-sectional view showing a configuration of an example of a mold for manufacturing an anisotropic conductive sheet according to the second invention.
- FIG. 6 is an explanatory cross-sectional view showing a state in which a sheet forming material layer is formed in a mold for manufacturing an anisotropic conductive sheet according to the second invention.
- FIG. 7 is an explanatory sectional view showing a state in which a parallel magnetic field is applied in a thickness direction to a sheet forming material layer formed in a mold for manufacturing an anisotropic conductive sheet according to the second invention. .
- FIG. 8 is a top view showing an example of a modification of the anisotropic conductive sheet according to the second invention. is there.
- FIG. 9 is a sectional view showing an example of a modification of the anisotropic conductive sheet according to the second invention.
- FIG. 10 is an explanatory cross-sectional view showing a configuration of an example of the impedance measuring probe according to the present invention.
- Non-magnetic layer 80 Anisotropic conductive sheet
- Addition type liquid silicone rubber manufactured by Shin-Etsu Gigaku Kogyo Co., Ltd. ⁇ 2000-60 ”100 parts by mass of magnetic conductive particles having a number average particle size of 8 ⁇ m 22.5 parts by mass and sodium alkyl sulfonate (C n H 2n ⁇ 1 SO 3 Na (n 12 to 20)) 2. 5 parts by mass was added and mixed to prepare a sheet molding material.
- the magnetic conductive particles composite particles (average coating amount: 7% by mass of the core particles) obtained by plating core particles of nickel with gold were used.
- the prepared sheet molding material was injected into a mold having a 30 ⁇ thick spacer having the configuration shown in FIG. 2 to form a sheet molding material layer.
- An anisotropic conductive sheet having the configuration shown in FIG. 1 was produced by performing a hardening treatment.
- anisotropic conductive sheet Cl this anisotropic conductive sheet is referred to as “anisotropic conductive sheet Cl”.
- the impedance measurement of a printed wiring board or the like can be performed in a good state.
- impedance measurement can be performed in a better condition.
- Table 1 shows the results.
- “ ⁇ ” indicates that the measured transmission loss value (S-parameter) was within the range of _1 dB to 0 dB, and the measured transmission loss value (S-parameter) was The case where the transmission loss was within the range of ⁇ 2 dB to 1 dB is indicated by “ ⁇ ”, and the case where the measured transmission loss value (S parameter) became larger in absolute value than ⁇ 2 dB. Indicated by "X”.
- Example 1 as shown in Table 1, as shown in Table 1, the number average particle diameter of the magnetic conductive particles to be used, the mass of the magnetic conductive particles to be added, the gold plating amount of the magnetic conductive particles, and the spacer constituting the mold were used.
- Anisotropic conductive sheets C2 to C18 were produced in the same manner as in Example 1 except that the thickness of each of the sheets was changed.
- Example 8 sheet C8 30 24 1.3 22.5 20 o ⁇ ⁇ ⁇ ⁇ ⁇ Example 9 sheet C9 50 24 2.1 22,5 20 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Example 10 sheet C10 100 24 4.2 22.5 20 ⁇ ⁇ ⁇ ⁇ ⁇ Comparative Example 1 Sheet C11 30 8 3.8 8 7 ⁇ ⁇ Room ⁇ XX Comparative Example 2 Sheet C12 100 8 12.5 22.5 7 ⁇ ⁇ ⁇ ⁇ XX Comparative Example 3 Sheet C13 125 8 15.6 22.5 7 ⁇ ⁇ XXXX Comparative Example 4 Sheet C14 125 18 6.9 22.5 8 ⁇ Room ⁇ XX Comparative Example 5 Sheet c 125 24 5.2 22.5 20 ⁇ ⁇ ⁇ XXX Comparative Example 6 Sheet C16 65 53 1.2 22.5 82 ⁇ ⁇ ⁇ XX Comparative Example 7 Sheet C17 100 53 1.9 22.5 82 mm ⁇ XXX Comparative Example 8 Sheet C18 125 53
- the anisotropic conductive sheet of the present invention has a specific thickness and contains magnetic conductive particles having a specific number average particle diameter, the impedance measurement in a high frequency region is performed with low resistance loss. It has excellent electrical characteristics when impedance measurement can be performed and has sufficient elasticity, so it does not damage the substrate to be measured at the time of pressurized conduction, and durability for repeated use Is a good thing.
- the anisotropic conductive sheet of the present invention can be suitably used for impedance measurement in a high frequency region of 1 GHz or more, particularly in a high frequency region of 10 GHz or more. Electronic components and the like can be measured. Since the impedance measurement probe of the present invention is provided with the above-described anisotropic conductive sheet, the probe has a low transmission loss characteristic of the anisotropic conductive sheet, an effect of preventing damage to the substrate to be measured, and It exhibits excellent performance in a high frequency region, specifically, a high frequency region of 1 G or more due to good durability of repeated use. Accordingly, according to the impedance measuring probe of the present invention, In the high-frequency range of 1 GHz or higher, especially in the high-frequency range of 10 GHz or higher, it is possible to suppress damage to the substrate to be measured during impedance measurement and to obtain high levels and high measurement reliability. it can.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60310739T DE60310739T2 (de) | 2002-08-27 | 2003-08-26 | Anisotrope leitfähige folie und impedanzmesssonde |
US10/525,024 US7071722B2 (en) | 2002-08-27 | 2003-08-26 | Anisotropic, conductive sheet and impedance measuring probe |
EP03791286A EP1544625B1 (en) | 2002-08-27 | 2003-08-26 | Anisotropic, conductive sheet and impedance measuring probe |
AU2003257535A AU2003257535A1 (en) | 2002-08-27 | 2003-08-26 | Anisotropic, conductive sheet and impedance measuring probe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002/247757 | 2002-08-27 | ||
JP2002247757 | 2002-08-27 |
Publications (1)
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WO2004021018A1 true WO2004021018A1 (ja) | 2004-03-11 |
Family
ID=31972483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/010748 WO2004021018A1 (ja) | 2002-08-27 | 2003-08-26 | 異方導電性シートおよびインピーダンス測定用プローブ |
Country Status (9)
Country | Link |
---|---|
US (1) | US7071722B2 (ja) |
EP (1) | EP1544625B1 (ja) |
KR (1) | KR100892196B1 (ja) |
CN (1) | CN1685240A (ja) |
AT (1) | ATE349705T1 (ja) |
AU (1) | AU2003257535A1 (ja) |
DE (1) | DE60310739T2 (ja) |
TW (1) | TWI248517B (ja) |
WO (1) | WO2004021018A1 (ja) |
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US20100252783A1 (en) * | 2009-04-07 | 2010-10-07 | Syh-Tau Yeh | Ambient-curable anisotropic conductive adhesive |
US8822843B2 (en) * | 2011-03-07 | 2014-09-02 | Nokia Corporation | Apparatus and associated methods |
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- 2003-08-26 WO PCT/JP2003/010748 patent/WO2004021018A1/ja active IP Right Grant
- 2003-08-26 EP EP03791286A patent/EP1544625B1/en not_active Expired - Lifetime
- 2003-08-26 KR KR1020057003196A patent/KR100892196B1/ko active IP Right Grant
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Also Published As
Publication number | Publication date |
---|---|
AU2003257535A1 (en) | 2004-03-19 |
EP1544625B1 (en) | 2006-12-27 |
TW200405014A (en) | 2004-04-01 |
DE60310739T2 (de) | 2007-10-11 |
EP1544625A4 (en) | 2005-10-12 |
ATE349705T1 (de) | 2007-01-15 |
US7071722B2 (en) | 2006-07-04 |
KR20050059084A (ko) | 2005-06-17 |
CN1685240A (zh) | 2005-10-19 |
DE60310739D1 (de) | 2007-02-08 |
EP1544625A1 (en) | 2005-06-22 |
US20060006884A1 (en) | 2006-01-12 |
KR100892196B1 (ko) | 2009-04-07 |
TWI248517B (en) | 2006-02-01 |
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