JP3105164U - Anisotropic conductive insulation displacement connector - Google Patents

Abstract

To provide an anisotropically conductive connector that withstands permanent compression set for a long period of time and has high sealing properties in order to achieve stable electrical connection for a long period of time.
The anisotropically conductive insulation displacement connector (10) of the present invention comprises an electrically insulating rubber layer (2) and a conductive rubber layer (1) alternately laminated and integrated, and an anisotropically conductive connector for energizing in a predetermined direction. Electrical insulation with a lower compression set than the anisotropic conductive connector element part (3) on the outer peripheral part of the side surface of the anisotropic conductive connector element part (3), including the conductive connector element part (3) The support part (4) made of an elastic rubber-like elastic body is integrated.
[Selection diagram] Fig. 1

Description

  The present invention relates to a rubber connector used for connecting an electric circuit such as an electronic component. More specifically, the present invention relates to an anisotropic conductive connector for electrically connecting a glass wiring board of an image display element such as a liquid crystal element (LCD) or an electroluminescence (EL) element to a drive board.

  2. Description of the Related Art Conventionally, anisotropic conductive connectors have been used to electrically connect between a glass wiring board and a drive board of an image display element such as an LCD or an EL element, or between the glass wiring board and a flexible printed board. This connector is an anisotropic conductive connector in which insulating rubber and conductive rubber are laminated and integrated with each other, and an anisotropic conductive metal in which thin metal wires penetrate the insulating rubber in the thickness direction by arranging thin metal wires in the insulating rubber so as to be separated from each other. There is a conductive sheet or the like (Patent Document 1 below).

  Among these rubber connectors, an anisotropic conductive connector in which insulating rubber and conductive rubber are laminated and integrated with each other has a compression set of about 40% (25% compression, temperature 100 ° C. × 150 hours later). . Further, the compression set of an anisotropic conductive sheet in which thin metal wires are arranged in an insulating rubber so as to be separated from each other and the thin metal wires penetrate the insulating rubber in the thickness direction is about 23% (25% compression at 100 ° C. × 150 ° C.). After hearing). That is, the compression set is large. To absorb the dimensional tolerances, distortions and deflections of the connecting parts and to attach a rubber connector between the facing electrode parts with sufficient pressing force against the electrode parts of the circuit board to obtain good electrical connection For example, it is usual that a rubber connector is compressed to about 5 to 30% of a height direction in a natural state, and electrical connection is established by sandwiching the rubber connector between electrode portions. Rubber connectors are not particularly suitable as rubber connectors used for electrical connection of equipment such as mobile phones used outdoors.

Further, these rubber connectors include a side support type rubber connector in which a sheet made of sponge-like rubber, soft rubber, or the like is bonded to outer peripheral portions of two side surfaces parallel to a conductive direction which are not used for electrical connection of the rubber connector. . Sponge-like rubber is generally soft and easily deformed by compression.However, compared to soft rubber, there is a problem that it is easy to absorb moisture at high humidity due to its low sealing property. It can also occur. Soft rubber reduces the crosslink density of rubber to reduce hardness and compressive force, and contains a large amount of plasticizer to soften, so a stable rubber material with low long-term compression set is obtained. Things are difficult. Such side-supported rubber connectors, when compressed and sandwiched between electrodes, cause a so-called "shattering" phenomenon with the passage of time, and as a result, maintain good electrical connection for a long period of time. However, there was a problem as a rubber connector used for internal connection of equipment used outdoors.
Japanese Patent Publication No. 2-10549

  As described above, the conventional rubber connector has a high permanent compression set and is distorted by long-term use, which makes it difficult to perform stable electrical connection for a long period of time.

  SUMMARY OF THE INVENTION The present invention provides an anisotropic conductive insulation displacement connector that withstands long-term compression set and has high sealing performance in order to achieve stable electrical connection for a long time.

  The anisotropically conductive crimping connector of the present invention is an anisotropically conductive connector including an anisotropically conductive connector element portion in which an electrically insulating rubber layer and a conductive rubber layer are alternately laminated and integrated, and which conducts electricity in a predetermined direction. A support portion made of an electrically insulating rubber-like elastic body having a lower compression set relatively than that of the anisotropically conductive connector element portion, at an outer peripheral portion of a side surface of the anisotropically conductive connector element portion. It is characterized by having

  The anisotropically conductive press-connecting connector of the present invention has an electrically insulating rubber-like material having a relatively low compression set relative to the anisotropically conductive connector element portion on an outer peripheral portion of a side surface of the anisotropically conductive connector element portion. By integrating the support portion made of an elastic body, it is possible to provide an anisotropically conductive connector that can withstand long-term compression set and has high sealing properties.

The anisotropically conductive press-connecting connector according to the present invention includes an anisotropically conductive connector element portion in which an electrically insulating rubber layer and a conductive rubber layer are alternately laminated and integrated, and includes an anisotropically conductive connector element portion that conducts electricity in a predetermined direction. A support portion made of an electrically insulating rubber-like elastic body having a lower compression set ratio than the anisotropic conductive connector element portion is integrated with an outer peripheral portion of a side surface of the element portion. Hereinafter, each element will be described.
(1) Conductive rubber of anisotropic conductive connector element portion The conductive rubber of the anisotropic conductive connector element portion is, for example, dimethylsilicone raw rubber (represented by ASTM D1418 (hereinafter the same): MQ), methylvinylsilicone raw rubber (VMQ), methyl Vinyl phenyl silicone raw rubber (PVMQ) and fluorosilicone raw rubber (FMQ) are filled with silica fine powder as a reinforcing filler and mixed to form a silicone base. Silicone raw rubber has a low intermolecular attractive force and has an amorphous structure. Therefore, when the silicone raw rubber is vulcanized, only a tensile strength of about 3 to 5 kgf / cm ² can be obtained, so that the selection of the reinforcing filler is important. Preferably, a silicone rubber base obtained by adding silica fine powder prepared by a fume method to methyl vinyl silicone raw rubber (VMQ) or methyl vinyl phenyl silicone raw rubber (PVMQ) is preferable. It is preferable to add 10 to 25 parts by mass of the reinforcing filler to 100 parts by mass of the raw silicone rubber. Thereby, the tensile strength becomes about 35 to 50 kgf / cm ² .

Further, in order to make the silicone base a conductive rubber, it is preferable to add a carbon powder such as carbon black or a metal powder. As the conductive rubber of the present invention, a conductive rubber having a low electric resistance is used because of its use as an anisotropic pressure contact connector for making electrical connection between electrode portions. For this reason, it is preferable that the metal powder has a surface resistance of 1 Ω / □ or less, and specifically, metals such as gold, silver, platinum, copper, nickel, iron, palladium, cobalt, chromium, and stainless steel. It is preferable to use a powder made of an alloy or a metal powder whose surface is coated with a noble metal such as gold or silver in order to reduce electric resistance. The preferred weight average particle size of the metal powder is in the range of 1 to 30 μm. Preferably, the metal powder is added in an amount of 400 to 600 parts by mass based on 100 parts by mass of the silicone base. Thereby, it is preferable that the volume resistivity of the conductive rubber be 10 ⁻⁴ Ω · cm or less.

As described above, the metal powder is mixed with the silicone base to obtain a conductive silicone rubber compound.
(2) Insulating rubber of anisotropically conductive connector element portion The electrically insulating rubber used for the anisotropically conductive connector element portion is dimethyl silicone raw rubber (indicated by ASTM D1418: MQ), methyl vinyl silicone raw rubber (VMQ), methyl vinyl A silicone compound is prepared by mixing phenyl silicone raw rubber (PVMQ) and fluorosilicone raw rubber (FMQ) with a reinforcing filler and a filler filler. Preferably, an insulating silicone rubber compound obtained by adding silica fine powder prepared by a fume method as a reinforcing filler to methyl vinyl silicone raw rubber (VMQ) or methyl vinyl phenyl silicone raw rubber (PVMQ) is preferable. The bulking filler is, for example, diatomaceous earth. The amount of addition is in the range of 10 to 35 parts by mass for the reinforcing filler and 10 to 40 parts by mass of the filler for 100 parts by mass of the silicone raw rubber. The rubber compound may be a known commercially available compound. Thereby, it is preferable that the volume resistivity of the electrically insulating rubber is set to 10 ¹⁴ Ω · cm or more.
(3) Preparation of an anisotropic conductive connector element portion In order to vulcanize the conductive silicone rubber compound and the electrically insulating silicone rubber compound, an organic peroxide is mixed with the rubber compound to prepare a silicone rubber stock. Examples of the organic peroxide include benzoyl peroxide, bis-2,4-dichlorobenzoyl peroxide, dicumyl peroxide, ditert-butyl peroxide, and 2,5-dimethyl-2,5-bis (t-butylperoxy). -Hexane and the like are uniformly dispersed and mixed in the rubber compound.

  Next, the conductive silicone rubber compound and the electrically insulating silicone rubber compound are each thinned, laminated and pressurized and heated, and the obtained block body is cut perpendicularly to the laminating direction to form an anisotropic conductive connector element. Make a part.

  When an anisotropic conductive insulation displacement connector is used, the thickness of one electrically insulating rubber layer is preferably in the range of 10 to 100 μm, and the thickness of one conductive rubber layer is preferably in the range of 30 to 100 μm.

In this way, it is possible to obtain an anisotropically conductive connector element portion having a compression set of 25%, a temperature of 100 ° C., and a compression set of 30% or more after a lapse of 150 hours.
(4) Support portion A support portion formed of an electrically insulating rubber-like elastic body having a lower compression set relatively than the anisotropic conductive connector element portion is provided on the outer peripheral portion of the side surface of the anisotropic conductive connector element portion. Are integrated.

The insulating rubber-like elastic material of the support portion is, for example, isoprene rubber (R), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene acrylic rubber (CR), nitrile butadiene rubber (NBR), butyl rubber (IR), ethylene Propylene rubber (EPM / EPDM), urethane rubber (U), silicone rubber (Q), fluoro rubber (FKM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM / ANM), epichlorohydrin rubber (CO / ECO), etc. Is mentioned. Among them, silicone rubber (Q), butyl rubber (IIR), ethylene propylene rubber (EPM / EPDM), fluoro rubber (FKM), urethane rubber (U), and the like, which have good electrical insulation and good compression set are preferable. Among them, silicone rubber (Q) is the best from the viewpoint of electrical insulation and good compression set. The insulating rubber is a mixture of dimethylsilicone raw rubber (indicated by ASTM D1418: MQ), methylvinylsilicone raw rubber (VMQ), methylvinylphenylsilicone raw rubber (PVMQ), fluorosilicone raw rubber (FMQ), and a reinforcing filler and an expanding filler. To make a silicone compound. Preferably, an insulating silicone rubber compound having good compression set is obtained by adding silica fine powder prepared by a fume method to methyl vinyl silicone raw rubber (VMQ) or methyl vinyl phenyl silicone raw rubber (PVMQ). The bulking filler is, for example, quartz powder having a weight average particle diameter of 5 to 20 μm. The amount of addition is in the range of 10 to 35 parts by mass for the reinforcing filler and 10 to 70 parts by mass of the filler for 100 parts by mass of the silicone raw rubber. The rubber compound may be a known commercially available compound. The volume resistivity of the electrically insulating rubber is preferably 10 ¹⁴ Ω · cm or more.

  In order to vulcanize the insulating silicone rubber compound, a commercially available organic peroxide is mixed to prepare a silicone rubber stock. Examples of organic peroxides include benzoyl peroxide, bis-2,4-dichlorobenzoyl peroxide, dicumyl peroxide, ditert-butyl peroxide, 2,5-dimethyl-2,5-bis (t-butylperoxy). ) -Hexane or the like is uniformly dispersed and mixed in a rubber compound.

  For example, a silicone compound obtained by mixing methylvinylsilicone raw rubber (VMQ) and quartz powder having a weight average particle diameter of 5 to 20 μm is mixed with 2,5-dimethyl-2,5-bis (t-butylperoxy)-as a vulcanizing agent. Rubber made by uniformly dispersing and mixing hexane or the like in a rubber compound is particularly excellent in low compression set.

  In this manner, a support portion having a compression set of 25%, a temperature of 100 ° C., and a compression set after passage of 150 hours of 10% or less can be obtained.

  It is preferable that an area ratio of the anisotropic conductive connector element portion and the support portion viewed from the upper surface is in a range of the anisotropic conductive connector element portion: the support portion = 1: 1 to 12. This is for maintaining high compression resistance.

  The anisotropic conductive insulation displacement connector preferably has a compression set of 25%, a temperature of 100 ° C., and a compression set after 150 hours of 15% or less. When the compression set is 15% or less, there is no settling, and high practically sufficient long-term compression resistance can be maintained. A more preferred compression set is 12% or less.

The anisotropically conductive insulation displacement connector of the present invention withstands permanent compression set for a long time and is particularly suitable for internal connection of electric equipment used outdoors. By compressing and pressing, the electrodes of the electric circuit board are electrically connected to each other, so that the long-term “striking” can be improved, the connection reliability can be maintained high, and the sealing property of the electrode surface is also high.

  Hereinafter, the anisotropic conductive insulation displacement connector of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an anisotropic conductive insulation displacement connector according to an embodiment of the present invention. The anisotropically conductive press-connecting connector 10 comprises an anisotropically conductive connector element portion 3 in which a conductive rubber layer 1 and an electrically insulating rubber layer 2 are alternately laminated and integrated, and which is energized in a vertical direction, and an outer peripheral portion of a side surface thereof. And the support part 4 are integrated. The anisotropic conductive insulation displacement connector 10 is, for example, 1.0 mm long, 1.0 mm wide, 2.0 mm high, the thickness of the support part 4 is 0.5 mm, and the anisotropic conductive insulation displacement connector is 2.0 mm long, horizontal The height is 2.0 mm and the height is 2.0 mm.

  FIG. 2 is a sectional view taken along line II of FIG. A conductive rubber layer 1 and an electrically insulating rubber layer 2 are alternately laminated and integrated in a central portion, and an anisotropic conductive connector element portion 3 which is vertically energized is disposed, and a support portion 4 is provided on an outer peripheral portion of a side surface thereof. Are located.

  FIG. 3 is a sectional view showing a state of an anisotropic conductive insulation displacement connector used for an actual LCD panel. An anisotropic conductive insulation displacement connector 10 is placed on the drive board 7 with the metal wiring 8, and the LCD panel board 5 with the metal wiring 6 is fixedly arranged on the connector 10, and then the drive board 7 is pushed up to remove the anisotropic conductive The press-connecting connector 10 is compressed and fixed by about 10 to 20%. H1 is the height before pressing, and H2 is the height after pressing.

FIG. 4 is a cross-sectional view showing a method for measuring the compression set of the anisotropic conductive pressure-welded connector. This measuring method is in accordance with JIS K6262-4, and the height t ₀ (unit: mm) of the anisotropic conductive pressure-connecting connector 10 before the initial pressure welding is measured. Next, the anisotropic conductive insulation displacement connector 10 is placed on the compression jig 11 having the spacers 12a and 12b, and bolts are tightened to a spacer height t ₁ (unit: mm) for compressing the height of the connector by 25%. Compress. It is put in an oven at 100 ° C. for 150 hours while being compressed by this jig. Thereafter, the compression jig is removed and the height t ₂ (unit: mm) of the connector after 30 minutes at room temperature is measured, and the compression set (%) is calculated from the following equation.
Compression set (Cs) = [(t ₀ −t ₂ ) / (t ₀ −t ₁ )] × 100

  The anisotropic conductive connector element is manufactured by thinning the conductive silicone rubber compound and the insulating silicone rubber compound, laminating each other, pressing and heating, and cutting the obtained block body perpendicular to the lamination direction. A laminated connector (Fujipoly connector S-Z series) having a length of 1 mm, a width of 1 mm, and a height of 1 mm obtained by the method was used. The compression set of the laminated connector in the conductive direction measured in accordance with JIS K6262-4 was 39% (after 100 ° C. for 150 hours).

  Next, 100% by mass of methyl vinyl silicone raw rubber (manufactured by Toray Dow Corning Silicone Co., Ltd., product name: CF-3110) is used for the outer peripheral portion of the side surface parallel to the conductive direction of the anisotropic conductive connector element. ) Was mixed with 25 parts by mass of silica fine powder (manufactured by Cabot, product name (Cab-0-Sil MS75)) and then mixed with quartz powder: 60 parts by mass (Pennsylvania Glass Sand Company, product name: Min-U-). Sil and an average particle diameter of 5 μm) were mixed to prepare an insulating rubber.

Further, 2,5-dimethyl-2,5-bis (t-butylperoxy) -hexane is used as a vulcanizing agent, and an RC-4 vulcanizing agent adjusted to 50% of an active ingredient (product name, manufactured by Toray Dow Corning Silicone Co., Ltd.) Was added to a sheet mold having a thickness of 1 mm, and primary vulcanization was performed at 170 ° C. for 10 minutes, followed by secondary vulcanization at 200 ° C. for 4 hours. A green rubber sheet to be used was obtained. When the compression set of the insulating rubber sheet was measured in accordance with JIS K6262-4, it was 4% (after 100 ° C. for 150 hours). Next, the side surface parallel to the conductive direction of the anisotropic conductive connector element was measured. A sheet of the insulating rubber (0.5 mm thick) was attached to the outer peripheral portion using an addition-reaction type silicone adhesive (manufactured by Toray Dow Corning Silicone Co., Ltd., product name: CY52-238). One-sided conductive insulation displacement connector was obtained. The size of this connector was 2 mm long, 2 mm wide, and 1 mm high. The permanent compression set of this connector was measured according to JIS K6262-4 and found to be 9% (after 100 hours at 100 ° C.).

  Even after an environmental test at a temperature of 60 ° C. and a relative humidity of 95% for 1,500 hours, no problems such as a short circuit occurred at all, and the sealing property was good.

(Comparative Example 1)
The anisotropic conductive connector element is manufactured by thinning the conductive silicone rubber compound and the insulating silicone rubber compound, laminating each other, pressing and heating, and cutting the obtained block body perpendicularly to the lamination direction. A 1 mm thick laminated connector (Fuji Poly Connector S-Z Series) obtained by the above method is provided with an RC851U rubber compound (product name, manufactured by Toray Dow Corning Silicone Co., Ltd.) on the outer peripheral portion of the side surface parallel to the conductive direction. -4 vulcanizing agent (product name, manufactured by Toray Dow Corning Silicone Co., Ltd.) was added in an amount of 0.5 part by mass to form a composition, and the composition was charged into a sheet mold having a thickness of 1 mm, and heated at 170 ° C. for 10 minutes. After the primary vulcanization, secondary vulcanization was performed at 200 ° C. for 4 hours to obtain a thickness of 1. An insulating rubber sheet used for the outer peripheral portion of Omm was obtained. When the compression set of the insulating rubber sheet was measured in accordance with JIS K6262-4, it was 18% (after 100 ° C. for 150 hours).

  Next, the above-mentioned insulating rubber sheet is applied to the outer peripheral portion of the side surface parallel to the conductive direction of the anisotropic conductive connector element by using an addition reaction type silicone adhesive (product name: CY52-238 manufactured by Toray Dow Corning Silicone Co., Ltd.). To obtain an anisotropic conductive connector. The dimensions of each part were the same as in Example 1. The permanent compression set of this connector was measured according to JIS K6262-4 and found to be 18% (after dark at 100 ° C. × 150 hours).

It is a perspective view of the anisotropic conductive pressure welding connector in one embodiment of the present invention. It is II sectional drawing of FIG. It is sectional drawing which shows the usage of the anisotropic conductive insulation displacement connector in one Embodiment of this invention. FIG. 4 is a cross-sectional view showing a method for measuring the compression set.

Explanation of reference numerals

REFERENCE SIGNS LIST 1 conductive rubber layer 2 electrically insulating rubber layer 3 anisotropic conductive connector element part 4 support part 5 LCD panel substrates 6 and 8 metal wiring 7 drive substrate 10 anisotropic conductive pressure welding connector 11 compression jigs 12 a and 12 b spacer

Claims (5)

An anisotropically conductive connector including an anisotropically conductive connector element portion in which an electrically insulating rubber layer and a conductive rubber layer are alternately laminated and integrated, and energized in a predetermined direction,
An outer peripheral portion of a side surface of the anisotropic conductive connector element portion, a support portion made of an electrically insulating rubber-like elastic body having a relatively low compression set relatively than the anisotropic conductive connector element portion is integrated. An anisotropic conductive insulation displacement connector characterized by the above-mentioned.   The anisotropic conductive connector element has a compression rate of 25%, a temperature of 100 ° C., and a compression set after 150 hours, which is 30% or more. The support section has a compression rate of 25%. The anisotropic conductive insulation displacement connector according to claim 1, wherein the compression set after the lapse of 150 hours is 100% or less.   The area ratio of the anisotropic conductive connector element portion and the support portion as viewed from the top surface is in the range of the anisotropic conductive connector element portion: the support portion = 1: 1 to 12. 4. Anisotropic conductive insulation displacement connector.   4. The anisotropic conductive pressure-connecting connector according to claim 1, wherein a compression set is 25%, a temperature is 100 ° C., and a compression set after 150 hours has passed is 15% or less. 5. Conductive insulation displacement connector.   2. The anisotropically conductive pressure-connecting connector according to claim 1, wherein the conductive rubber of the anisotropically conductive connector element portion is a conductive material obtained by mixing metal powder with rubber. 3.

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