JPH0730465U - Elastic connector - Google Patents

Abstract

(57) [Summary] (Modified) [Objective] The present invention provides an elastic connector that is useful for connecting electronic circuits such as analog circuits and digital circuits, and electronic parts, especially for devices that generate a large amount of heat. The purpose is. [Structure] An elastic connector 1 of the present invention comprises a sheet-shaped material composed of electrically insulating elastic members 2 and 3 having high thermal conductivity, and a plurality of thin metal wires 4 as conductive portions arranged in the thickness direction of the sheet-shaped material. It is characterized by being penetrated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an elastic connector, in particular, an anisotropic conductive type elastic connector which is useful for connection between an analog circuit, a digital circuit, an electronic circuit that can be used for a device with a large amount of heat generation, and / or an electronic component. is there.

[0002]

[Prior art]

 For the elastic connector, a large number of insulating silicone elastic sheets and conductive silicone elastic sheets prepared by dispersing a conductivity-imparting agent such as carbon black in the silicone elastic sheet are alternately and parallel laminated. It is known that the silicone elastic sheet has excellent electrical characteristics, and is widely used for connecting various circuits. Regarding this elastic connector, it is also known that metal thin wires are arranged in an electrically insulating elastic sheet to form a multilayered block, sliced with a rotary blade, and the ends of the thin metal wires are plated with gold. This is used for board connection and IC inspection.

[0003]

[Problems to be solved by the device]

 However, in the connector made of this silicone elastic sheet, when carbon black is used as the conductivity-imparting agent in the conductive silicone elastic sheet, the volume resistivity of the conductive part becomes higher than 0.2 Ω ・ cm, so analog circuits and It has the disadvantage that it cannot be used in high-frequency digital circuits, and carbon black must be highly filled to reduce this volume resistivity to 0.4 Ω · cm or less. The rubber hardness becomes high and it becomes unsuitable for compression use. In this case, if a current of 1 mA or more is applied, heat will be generated and the temperature will rise by 50 ° C or more, so there will be a drawback that it will be unsuitable as an elastic connector. .

Therefore, it has been proposed to use the conductivity-imparting agent as a metal-based filler for this elastic connector, but this causes the rubber hardness of the elastic sheet to be high, which makes it unsuitable for compression use. There is a problem in reliability due to repeated compression due to contact between metallic fillers in the conductive mechanism. In addition, the above-mentioned elastic connector using thin metal wires makes the connection unstable because the electrical connection is metal-to-metal contact, especially when the elastic connector has a low compression load with a small compression amount. There is a disadvantage that the contact becomes unstable because a sufficient contact pressure is obtained. With regard to this type of elastic connector, the device to be connected has become more functional and faster, and the power consumption has been increasing, resulting in an increase in heat generation. There is also the problem that there is no way to efficiently dissipate the heat.

[0005]

[Means for Solving the Problems]

 The present invention relates to an elastic connector that solves the above disadvantages, drawbacks, and problems of the conventional product. It is a sheet-like member made of an electrically insulating elastic member having high thermal conductivity and is used as a conductive portion. It is characterized in that a plurality of thin metal wires are arranged and penetrated in the thickness direction of the sheet-shaped material.

That is, the inventor of the present invention has conducted various studies to develop an elastic connector that can be used for connecting an analog circuit or a digital circuit, and can be used for a device that generates a large amount of heat. It was found that the heat generated by the device can be efficiently dissipated to the mounting board if the electrically insulating elastic member in the above is made of an insulating elastic material with high thermal conductivity, and such an elastic connector generates heat. The present invention has been completed after confirming that it can be mounted on a large amount of devices. This will be described in more detail below.

[0007]

[Action]

 The present invention relates to an elastic connector, in which a sheet-like member made of an electrically insulating elastic member having high thermal conductivity is provided with a plurality of thin metal wires as conductive portions arranged in the thickness direction of the sheet-like member. However, even if the connected device generates heat, this heat can be released to the mounting board. It has the advantage that it will be useful for connecting to.

The elastic connector of the present invention is, for example, the one shown in FIG. 1 (a) is a front view of the elastic connector which is an embodiment of the present invention, and FIG. 1 (b) but shows a cross-sectional view of Waso, the elastic connector 1 is thin metal wire 4 ... heat A plurality of electrically insulating elastic sheets 2 having high conductivity are arranged and penetrated through the electrically insulating elastic sheet 2 at regular intervals, and the electrically insulating elastic sheets 2 are integrally bonded through the electrically insulating elastic sheet 3.

The electrically insulative elastic member having high thermal conductivity which constitutes the elastic connector of the present invention may be made of an elastic member having excellent heat resistance, and therefore natural rubber and isoprene may be used. Synthetic rubber such as rubber, styrene / butadiene rubber, butyl rubber, nitrile rubber, ethylene / propylene / diene rubber, acrylic rubber, urethane rubber, silicone rubber, and fluororubber, and styrene / butadiene / styrene series, polyester series and polyurethane series Examples of various thermoplastic elastomers include silicone rubbers, which are excellent in heat resistance, environment resistance characteristics, electrical characteristics, and mechanical characteristics.

However, since this electrically insulating elastic member is used as a material for an elastic connector, and it is particularly required to have high thermal conductivity, this rubber member has a rubber hardness of 20 to 20. The volume resistivity at 80 ° Hs is 1 × 10 ¹³ Ω · cm or more, and the thermal conductivity is preferably 20 × 10 ⁻³ to 1 × 10 ⁻³ W / m · ° C. The hardness and volume resistivity of the above-mentioned silicone rubber can be controlled within the above-mentioned range by controlling the composition of siloxane which constitutes the silicone rubber, but the thermal conductivity is generally 5 × 10 ^-4 W / m.・ The temperature is set to ° C. Since it cannot be used for the elastic connector of the present invention as it is, it is necessary to add a thermal conductivity improver to it.

As the thermal conductivity improver, a ceramic powder such as titania, spiral, alumina, magnesia, boron nitride, aluminum nitride, beryllium oxide, tin nitride, or cerium oxide as an electrically insulating filler for improving thermal conductivity is used. The thermal conductivity of 20 × 10 ^-3 〜 1 × 10 ^-3 W / m ・ ° C can be obtained by adding 20 to 60% by volume of electrically insulating elastic material such as silicone rubber. It can be adjusted. In addition, since a large number of fine metal wires are arranged in the thickness direction of the sheet in this electrically insulating elastic member, it is preferable that the adhesive strength with the fine metal wires is 30 to 50 g / piece. For this, it is preferable to use a primer treatment of fine metal wires and an elastic member mixed with a silane coupling agent.

Next, as the thin metal wires that compose the elastic connector of the present invention, gold wires, brass wires, phosphor bronze wires, brass wires, beryllium copper wires, nickel wires, copper wires, aluminum wires, molybdenum wires, and tungsten wires are used. , Stainless steel wire, etc., but it is preferable to use brass wire or phosphor bronze wire, which has good conductivity, allows a low load during compression, and is relatively easy to obtain. In order to improve its reliability, it may be plated with nickel, gold, lead or the like. The wire diameter of 5 to 100 μm is preferably used for this, but if the wire diameter becomes too thin, the contact with the electrode tends to be unstable, and if it becomes thick, the load during compression connection tends to increase. Therefore, it is preferable that it is selected from the range of 20 to 40 μm, and gold or gold alloy may be plated on the tip of this material in order to reduce the contact resistance. In addition, if the density of the conductive part is too low, the area of the electrode that can be connected and connected tends to increase, and if the metal wire density is too high, the compression load tends to increase and a sufficient amount of compression to ensure a connection should be secured. Since it is difficult to do so, it is recommended to set 400 to 20,000 pieces / cm ² .

The elastic connector of the present invention has the above-mentioned thin metal wires arranged at regular intervals in the thickness direction of, for example, 0.05 to 1.0 mm in the thickness direction of the sheet-like material made of the above-mentioned electrically insulating elastic member having high thermal conductivity. The fine metal wires may be arranged in a single row, but are preferably arranged in multiple rows. Since the electrically insulating elastic member of the present invention thus manufactured has the above-mentioned physical properties, it can be used in analog circuits and digital circuits, and especially the heat generation amount Although it can be advantageously used for many devices, at this time, the elastic connector 1 is arranged between the electronic device 6 and the printed wiring board 7 to connect them as shown in FIG. It is preferable that the heat radiation fin 8 is provided on the upper portion so that the heat generated from the electronic device 6 is radiated to the outside of the system.

[0014]

【Example】

Next, examples of the present invention will be given. Example A layer having a thickness of 50 μm and a heat shrinkage rate of 0.5%, the surface of which was sandblasted to Ra of 0.8 and the surface of which was treated with a surfactant, the surface of a polyester film having a hardness of 50 ° Hs, Silicone rubber compound KE-3408U [trade name of Shin-Etsu Chemical Co., Ltd.], which has a thermal conductivity of 1.6 × 10 ^-3 W / m · ° C., contains 100 parts by weight of a vulcanizing agent C-8A [Shin-Etsu Chemical Co., Ltd. 3 parts by weight of the product name manufactured by K.K. and 1 part by weight of silane coupling agent KBM-403 [product name of Shin-Etsu Chemical Co., Ltd.] were added and kneaded to obtain a silicone rubber composition having a thickness of 0.1 mm. Then, a divided sheet-like material was prepared.

Then, on the dispensed silicone rubber composition, brass fine wires with a diameter of 40 μm and Au-Co alloy plated with a thickness of 0.4 μm were arranged at intervals of 0.1 mm. A sheet material obtained by dispensing the silicone rubber composition was laminated on the obtained polyester film, aged at 6 kgf / cm ² for 8 minutes, heat-molded at 120 ° C. for 15 minutes, and after molding, the polyester film was peeled off and heat-treated. A sheet was prepared in which thin metal wires were arranged at regular intervals on an electrically insulating elastic member having high conductivity.

Separately from the above, a 100 μm-thick product having the same specifications as the one used previously is used. The same as 100 parts by weight of the heat conductive silicone rubber compound KE-3408U previously used on the surface of the polyester film. The silicone rubber composition obtained by adding 3 parts by weight of the vulcanizing agent C-8A previously used and kneading was dispensed to a thickness of 0.3 mm, and a film having the same specifications as the polyester film previously used was laminated. Together, they were heated and pressure-molded for 5 minutes under the conditions of 180 ° C. and 5 kgf / cm ² , and after molding, the polyester film was peeled off to produce a silicone rubber sheet having high thermal conductivity.

Next, a sheet in which thin metal wires are arranged at regular intervals on the electrically insulating elastic member having high thermal conductivity obtained above and the silicone rubber sheet having high thermal conductivity obtained above are used as a silicone rubber adhesive KE- 1934A / B [trade name of Shin-Etsu Chemical Co., Ltd.] is applied to both sheets by screen printing with a thickness of 30 μm, and a large number of layers are alternately laminated to form a 50 mm-high laminated body, which is then vacuum removed. After foaming, the block was integrated by heating and pressurizing at 120 ° C and 0.03 kgf / cm ² for 4 hours, and this block was elastic in the direction perpendicular to the metal wires arranged in the stacking direction and the vertical method. An elastic connector was manufactured by slicing to a thickness of 0.3 mm using a connector slicer (made by our company).

When this elastic connector was compressed to 0.25 mm using a connector resistance measuring device manufactured by our company and the conductivity performance was examined, it showed a connection resistance of 10 mΩ with an electrode of 1 × 1 mm. When a current of 1 A was applied between the electrodes and the heat generation of the elastic connector was observed, it was only 5 ° C higher than the initial temperature even after 10 minutes had elapsed. It was confirmed that it could be used for a sufficient purpose. To check the heat dissipation of this elastic connector, print it by sandwiching it between a metal plate kept at a constant temperature of 80 ° C and a glass epoxy printed wiring board with a thickness of 1.6 mm. When the surface temperature change of the wiring board was observed, the elastic connector using general silicone rubber exceeded 70 ° C in 2 minutes, whereas this elastic connector exceeded 70 ° C in 30 seconds, so this elastic connector It was confirmed that the connector is suitable for connecting devices with high heat generation, because it can efficiently dissipate the heat generated by the device to the printed wiring board.

[0019]

[Effect of device]

 The present invention relates to an elastic connector, which is a sheet-like member made of an electrically insulating elastic member having high thermal conductivity as described above, and a plurality of thin metal wires as conductive portions arranged in the thickness direction of the sheet-like member. Although it is characterized by being penetrated, it has the advantage that it can be used in analog circuits and digital circuits and that the heat generated by devices with particularly large heat generation can be efficiently dissipated. It has.

[Submission date] December 24, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

The elastic connector of the present invention is, for example, the one shown in FIG. 1 (a) is a front view of the elastic connector which is an embodiment of the present invention, and FIG. 1 (b) but shows a cross-sectional view of Waso, the elastic connector 1 is thin metal wire 4 ... heat A plurality of electrically insulating elastic sheets 2 having high conductivity are arranged and penetrated through the electrically insulating elastic sheet 2 at regular intervals, and the electrically insulating elastic sheets 2 are integrally bonded through the electrically insulating elastic sheet 3. In addition, 5 is an adhesive.

[Brief description of drawings]

1 shows an elastic connector of the present invention, (a) is a front view thereof, and (b) is a cross-sectional view thereof.

FIG. 2 is a vertical cross-sectional view of the elastic connector of the present invention in use.

[Explanation of symbols] 1 ... Elastic connector, 2, 3 ... Thermally conductive electrically insulating elastic member, 4 ... Metal thin wire, 5
... adhesive, 6 ... electronic device, 7 ... printed wiring board, 8 ... heat dissipation fin.

Claims (2)

[Scope of utility model registration request] 1. An elastic material comprising a sheet-shaped material made of an electrically insulating elastic member having high thermal conductivity, and a plurality of thin metal wires as conductive portions arranged and penetrating in the thickness direction of the sheet-shaped material. connector. 2. The rubber hardness of the electrically insulating elastic member is 20.
〜80 ° Hs, volume resistivity 1 × 10 ¹³ Ω · cm or more, thermal conductivity
20 × 10 ^-3 〜 1 × 10 ^-3 W / m ・ ° C, Adhesion with thin metal wire 30-50
The elastic connector according to claim 1, which has a characteristic of g / line.