JPH02856Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a press-contact type anisotropic conductive connector used for connecting various precision electronic equipment circuits, transparent electrodes on glass substrates, etc.

[Conventional technology]

The conventional anisotropic conductive connector is
As disclosed in Japanese Patent No. 48951, conductive members and insulating members, at least one of which is flexible, are laminated and integrated in multiple layers alternately so that their joining surfaces are parallel to each other, and formed into a block shape. Then, cut this into a sheet or plate shape in the stacking direction, and then cut this into a rod shape with a desired cross section such as a circle, ellipse, rectangle, or diamond, or a side circumferential surface with a rectangular cross section. Carrier sheets are known in which an insulating rubber elastic layer is bonded and integrated on one or both sides, and furthermore, as disclosed in JP-A-55-105985, there is a carrier sheet printed with a conductive material layer in a striped pattern. After laminating and integrating an uncured electrically insulating elastomer sheet, the carrier sheet is separated and an elastomer sheet to which a striped conductive material layer is transferred is further laminated, or as shown in FIGS. 9 and 10. By performing injection molding using a mold on a non-conductive member 6 provided with a through hole 5, a conductive member 7 whose cross section orthogonal to the electrical connection direction has the same rectangular shape is joined. It is known that it is integrated.

[Problem that the invention attempts to solve]

However, an anisotropic conductive connector is produced by laminating conductive members and insulating members alternately and in multiple layers so that their joining surfaces are parallel to each other and cutting them into sheets or plates. If the hardness of the electrically conductive member is not slightly lower than or equal to that of the conductive member, there is a problem that the precise pitch required for parallel multiple bonding surfaces, that is, electrical bonding, cannot be obtained. In addition to the above, when a conductive member is printed and laminated on a carrier sheet or by injection molding using a mold, it is difficult to change the cross-sectional area perpendicular to the electrical connection direction of the conductive member. However, there is a problem in that an appropriate cross section corresponding to the connection capacitance and the like cannot be obtained. In addition, conductive materials containing a large amount of conductivity imparting agent to lower the resistance value increase in hardness and become difficult to cut into thin sheets. When a bonded anisotropic conductive connector is mounted, there is a problem in that the pressure contact load increases, leading to cracks and damage to the glass substrate as well as poor electrical connection.

[Means for resolving questions]

This invention was made in view of the above circumstances, and its means is to arrange anisotropically conductive connectors in parallel at desired intervals and whose cross-sectional shape orthogonal to the electrical connection direction is rectangular. In addition, the cross-sectional area is different, and it is JIS K6301.
A plurality of rod-shaped conductive rubber-like elastic bodies having a rubber hardness of 50 to 90 as specified in
It is composed of an insulating liquid rubber elastic body having a rubber hardness of 20 or less and an insulating rubber-like elastic body having a rubber hardness of 30 or less and forming joint surfaces parallel to each other with the insulating liquid rubber elastic body sandwiching the insulating liquid rubber elastic body.

[Effect]

The anisotropically conductive connector of this invention having the above structure has the outer peripheral surfaces of rod-shaped conductive rubber-like elastic bodies arranged in parallel at desired intervals embedded in a layer of insulating liquid rubber-like elastic body. The rod-shaped conductive rubber-like elastic body is insulated on all outer circumferential surfaces of the insulating liquid rubber elastic body except for the surface used for electrical connection, and is held without losing flexibility. Therefore, the rod-shaped conductive rubber elastic body whose outer peripheral surface is embedded in the insulating liquid rubber elastic body can be bent in accordance with the load, so that the pressure contact load applied during mounting can be dispersed. Furthermore, since an appropriate pressure contact load is concentrated on the rod-shaped conductive rubber-like elastic body, the electrical connection of the anisotropically conductive connector can be reliably performed even with a relatively low pressure contact load. In addition, since the rubber hardness of the insulating liquid rubber elastic body embedded in the outer peripheral surface of the rod-shaped conductive rubber-like elastic body is 20 or less, the cross-sectional shape perpendicular to the electrical connection direction of the plurality of rod-shaped conductive rubber-like elastic bodies is formed. can be formed into rectangular shapes with different cross-sectional areas, and each of the plurality of rod-shaped conductive rubber-like elastic bodies can have a cross-section suitable for connection capacitance, etc. Furthermore, an insulating rubber-like elastic body having a rubber hardness of 30 or less, which is provided between the insulating liquid rubber-like elastic body and forming joint surfaces parallel to each other, can be insulated from the rod-shaped conductive rubber-like elastic body. The anisotropic conductive connector can be molded into a thin sheet and provided even if the hardness of the rod-shaped conductive rubber elastic body is increased. becomes easier.

〔Example〕

The following is an example of this invention and its manufacturing process.
This will be explained based on FIGS. 8 to 8.

The anisotropic conductive connector 1 includes a plurality of rod-shaped conductive rubber-like elastic bodies arranged in parallel at a desired interval, each having a rectangular cross-sectional shape perpendicular to the electrical connection direction, and having a rubber hardness of 50 to 90 and different cross-sectional areas. The outer peripheral surface of 2 is embedded in a single layer with insulating liquid rubber elastic material 3 having a rubber hardness of 20 or less, and a layer of insulating liquid rubber elastic material 3 is further sandwiched from above and below to form joint surfaces parallel to each other. Insulating rubber-like elastic bodies 4 having a rubber hardness of 3 or less are bonded together.

As shown in FIG. 1, a cross section of the rod-shaped conductive rubber-like elastic body 2 perpendicular to the connection direction shows the connection current capacity and the terminals of the drive circuit (not shown) and the glass substrate that is pressure-bonded when the anisotropically conductive connector 1 is mounted. A plurality of rod-shaped conductive rubber-like elastic bodies 2 are arranged in a horizontally elongated rectangular shape to obtain a cross section suitable for the shape or pitch of They are arranged in parallel at intervals. FIG. 2 shows a rod-shaped conductive rubber-like elastic body 2 whose cross section orthogonal to the connection direction is a vertically elongated rectangle, and a plurality of rod-shaped conductive rubber-like elastic bodies formed in the same manner with a constant horizontal length. Elastic bodies 1 are provided in parallel at desired intervals. The plurality of rod-shaped conductive rubber-like elastic bodies 2 provided as described above each have a required cross-sectional area to correspond to the connection capacitance.

As the rod-shaped conductive rubber-like elastic body 2 in the anisotropically conductive connector 1, a material obtained by dispersing and blending a conductivity imparting agent such as carbon black, metal powder, or graphite into an insulating rubber can be used. . It has been found that by adding these conductivity imparting agents, when the rubber hardness is in the range of 50 to 90, it can be effectively used in this invention. Among synthetic rubber elastic bodies, silicone rubber is most suitable as the insulating rubber-like elastic body 4 since there is no risk of contamination or corrosion. This insulating rubber-like elastic body 4
A rubber hardness of 30 or less is suitable in order to reduce the pressure contact load, and anything higher than this is unsuitable. Furthermore, as the insulating liquid rubber elastic body 3, a synthetic rubber-based material containing a reinforcing agent, an adhesion promoter, a curing accelerator, a vulcanizing agent, and a filler can be used, but a one-component type Silicone rubber is optimal in terms of physical properties and processability. This insulating liquid rubber elastic body 3 is necessary to reduce the compressive load together with the insulating rubber elastic body 4, and it is necessary to fill the recess formed by the adjacent rod-shaped conductive rubber elastic body 1. Therefore, rubber hardness of 20 or less is suitable.

Next, to explain the manufacturing process of the anisotropically conductive connector 1 of this invention, as shown in FIG. After bonding on B, cut grooves C are formed with a desired width dimension in the bonding direction using a cutter, and peeled off leaving only every other or necessary part. As shown in Fig. 4, a large number of bar-shaped grooves Rod-shaped conductive rubber-like elastic bodies 2 are arranged in parallel. In this case, the cross-sectional shape of the plurality of rod-shaped conductive rubber-like elastic bodies 2 as shown in FIG. 1 is a horizontally long rectangle, and includes those having different cross-sectional areas. In order to provide a plurality of rod-shaped conductive rubber elastic bodies 2 with a longitudinally elongated rectangular cross-sectional shape and varying cross-sectional areas as shown in FIG. 2, conductive rubber elastic bodies A are placed on a sheet B. After bonding, the conductive rubber elastic body A is ground or cut in the vertical direction with a predetermined width, and a cut groove C is formed in the bonding direction with a cutter, and every other part or necessary parts are left and peeled off. do it. Next, as shown in FIG. 5, after the insulating liquid rubber elastic body 3 applied to the insulating rubber-like elastic body 4 is tightly bonded to the rod-shaped conductive rubber-like elastic body 2 and hardened and bonded, the sheet B is peeled off. Then, by turning it over, a large number of rod-shaped conductive rubber-like elastic bodies 2 arranged in parallel as shown in FIG. As shown in FIG. 2, the insulating liquid rubber elastic body 3 applied to the insulating rubber-like elastic body 4 is filled into the recess formed by the adjacent rod-shaped conductive rubber-like elastic body 2, and at the same time, the insulating rubber-like elastic body 4 is filled. Closely adheres and hardens to integrate. The thus obtained connector sheet D shown in FIG. 8 is cut in the direction perpendicular to the bonding surface as shown by the dotted line a to obtain the anisotropically conductive connector of this invention having a desired shape.

[Effect of idea]

As is clear from the above explanation, the anisotropic conductive connector of this invention has a rectangular cross-sectional shape of the rod-shaped conductive rubber-like elastic body, and by arranging rod-shaped conductive rubber-like elastic bodies with different cross-sectional areas, the connection current capacity and connection can be improved. In addition to being able to match the shape of the terminal to be used, it is also easy to obtain accurate pitch, and it is also easy to manufacture even if the rod-shaped conductive rubber-like elastic body is made of a material with low resistance and high rubber hardness. In addition to its advantages, since it uses liquid rubber and insulating rubber with low rubber hardness, it prevents damage to glass substrates, etc., and it concentrates the pressure contact load during mounting on the bar-shaped conductive member, making the electrical connection reliable. This has the advantage that the connectors have improved properties and are increasingly used as connectors for various precision electronic equipment circuits.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the anisotropically conductive connector of this invention, and Figure 1 is a front view illustrating a case where the orthogonal cross-sectional shape of the rod-shaped conductive rubber-like elastic body is provided in a horizontally long rectangle. , FIG. 2 is a front view illustrating the case where the orthogonal cross-sectional shape of the rod-shaped conductive rubber-like elastic body is provided in a vertically elongated rectangular shape, and FIGS. 3 to 8 are examples of the manufacturing process of the anisotropically conductive connector of this invention. FIGS. 9 and 10 illustrate conventional examples of anisotropic conductive connectors, FIG. 9 is a perspective view, and FIG.
The figure is a front view. 1... Anisotropically conductive connector, 2... Rod-shaped conductive rubber-like elastic body, 3... Insulating liquid rubber elastic body,
4...Insulating rubber-like elastic body.

Claims (1)

[Scope of utility model registration request] A plurality of rod-shaped conductive rubber-like elastic bodies having a rubber hardness of 50 to 90, which are arranged in parallel at a desired interval, have a rectangular cross-sectional shape perpendicular to the electrical connection direction, and have different cross-sectional areas; an insulating liquid rubber elastic body with a rubber hardness of 20 or less provided in a single layer so as to bury the outer circumferential surface of the rubber-like elastic body; and a rubber hardness forming parallel joint surfaces with the insulating liquid rubber elastic body sandwiching the insulating liquid rubber elastic body. Anisotropically conductive connector consisting of an insulating rubber-like elastic material of 30% or less.