JPH0689752A - Connector - Google Patents

Abstract

PURPOSE:To simply make connection of electrodes formed at a small pitch with good reliability and with small pressurizing force. CONSTITUTION:A plurality of through-holes 32 are formed on a resin film 31 and filled with resilient, rubber in which conductive particles are dispersed, and contacts 33 are formed each having joint surfaces protruding on the two surfaces of the resin film 31. This ensures that good insulation is provided between the contacts 33, and they can be arranged at a small pitch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connector used for connecting a land grid array, an IC chip, a flexible printed wiring board or the like to a wiring board, a subcarrier or the like.

[0002]

2. Description of the Related Art An anisotropic conductive film is known as a conventional connector of this type. That is, as shown in FIG. 4, conductive particles 12 such as metal or carbon are dispersed in a resin adhesive 11 such as epoxy or urethane to form an anisotropic conductive film 13, and a wiring board 14 is provided through this film 13. The upper pad 15 and the pad 17 of the IC chip 16 are made to face each other, and the IC chip 16 is pressed against the wiring board 14 and heated, whereby both pads 15,
The conductive particles 12 are sandwiched between 17 and are connected only in the pressing direction, that is, in the thickness direction of the film 13.

Further, Japanese Patent Laid-Open No. 2-239578 proposes an anisotropic conductive sheet in which superelastic metal balls are arranged in an island shape. As shown in FIG. 5, the anisotropic conductive sheet 18 is made of a superelastic metal sphere 19 made of a material such as Ni-Ti and is embedded in an island shape by molding a polyimide resin 21. Part of the superelastic metal spheres 19 are exposed on the front and back of the conductive sheet 18.

Between the wiring board 14 and the IC chip 16,
After the anisotropic conductive sheet 18 is inserted and the pad 15 on the wiring board 14, the pad 17 of the IC chip 16 and the superelastic metal sphere 19 are aligned with each other, a resin having a large shrinkage ratio at the time of curing is inserted. A pressing force is applied by 22 to compressively deform the superelastic metal sphere 19 to electrically connect it.

[0005]

The conventional anisotropic conductive film 13 shown in FIGS. 4A and 4B has conductive particles 12 between conductors.
However, there is a problem in the insulation property when the electrode pitch is narrowed. Anisotropic conductive sheet 18 shown in FIG.
Because the superelastic metal spheres 19 are regularly arranged,
The insulating property is superior to that of the anisotropic conductive film 13. However, when connecting a plurality of electrodes arranged in a plane, a large pressing force is required to elastically deform the plurality of superelastic metal spheres 19. Therefore, resin 2
It is not easy to obtain such a large pressing force, including the method of obtaining the pressing force by contraction of No. 2, and there is a possibility that a connection failure may occur.

The object of the present invention is to eliminate the drawbacks of the prior art and to connect electrodes formed at a narrow pitch in a reliable and simple manner.
Another object of the present invention is to provide a connector for electrical connection, which can be performed with a relatively small pressure.

[0007]

According to the present invention, a resin film having a plurality of through holes formed therein and an elastic rubber in which conductive particles are dispersed are filled in the through holes and protrude from both sides of the resin film. The connector for electrical connection is configured by a plurality of contacts forming a joint surface.

Further, the portion of the contact protruding from the resin film is widened like a brim from the through hole.

[0009]

According to the present invention having the above-described structure, the contact made of the elastic rubber in which the conductive particles are dispersed is positioned between the electrodes to be connected, and the contact is clamped and pressed by these electrodes. , The contact is deformed and press-contacts with both electrodes, and both electrodes are electrically connected.

[0010]

FIG. 1 shows an embodiment of the present invention. Resin film 31 made of polyester or polyimide
A plurality of through holes 32 are formed in the. These through holes 32 are arranged in a grid pattern in this example. Each through hole 3
A plurality of contact points 33 are formed by filling 2 with conductive elastic rubber in which conductive particles such as metal powder or carbon are dispersed. The contact points 33 project from both sides of the resin film 31 to form a joint surface.

2A to 2E show a method of manufacturing the electrical connecting connector 34 configured as described above in the order of steps. A plurality of through holes 32 are formed in the resin film 31 by punching or laser processing (A). The resin film 31 is placed on the work holder 35 of the printing machine, and the conductive liquid rubber 36 in which the conductive particles are dispersed is screen-printed in each through hole 32. Liquid rubber 36
The printing range is set to be slightly larger than the diameter of each through hole 32, that is, the liquid rubber 36 is printed on the plate surface of the resin film 31 so as to have a diameter slightly larger than the diameter of each through hole 32. (B). A commercially available conductive liquid rubber 36 for printing of this type can be used.

The liquid rubber 36 filled in each through hole 32 is cured. One joint surface of the contact 33 is completed (C).
The resin film 31 is turned upside down and placed on a work holder 38 provided with a counterbore 37 at a position corresponding to each joint surface projecting on the resin film 31.
The liquid rubber 36 is printed on the other plate surface in the same manner as in (B) (D). By curing the liquid rubber 36, the electrical connection connector 34, which is made of conductive elastic rubber and has the contact points 33 whose joint surfaces project from both surfaces of the resin film 31, is completed (E).

Next, the electrical connection connector 3 shown in FIG.
4, the land grid array 41 and the wiring board 4 are used.
A case where the connection with the device 2 is performed will be described with reference to FIGS. 3A and 3B. The land grid array 41 is an electronic component (device)
A plurality of pads 43 are insulated from each other on one surface and are formed in a grid pattern. The wiring board 42 is made of a glass substrate, a ceramic substrate, an alumina substrate, a glass epoxy substrate, or the like.
And are formed in a grid pattern with the same pitch.

An electrical connection connector 34 having contacts 33 arranged in a grid pattern at the same pitch as the pads 43 is arranged between the land grid array 41 and the wiring board 42, and the pads 43, the contacts 33 and the pads 44 are provided. Align with each other,
The land grid array 41 is pressed to press the land grid array 41 against the wiring board 42 via the electrical connection connector 34. The contact point 33, which is sandwiched and pressed by the pads 43 and 44 facing each other, is elastically deformed and comes into pressure contact with the pads 43 and 44.

In this state, the land grid array 41 and the wiring board 42 are fixed to each other by, for example, a screwing method or a throttle method, so that the land grid array 41 and the wiring board 42 are electrically connected to each other.
4 and the corresponding pads 43 and 44 are electrically connected to each other through contacts 33.

[0016]

As described above, in the electrical connecting connector according to the present invention, a plurality of through holes are formed in the resin film, and the through holes are filled with the elastic rubber in which the conductive particles are dispersed to fill the resin film. Since the contacts are formed with the bonding surfaces protruding from both sides, the insulation between the contacts is excellent, and even when the electrodes to be connected are formed with a narrow pitch, they are reliable and relatively small. They can be easily connected by pressing force. For example, the contact diameter is about 100 μm and the arrangement pitch is 300 μm.
It is also possible to have a narrow pitch of m or less.

Further, the contact strength of the contact to the resin film can be improved by expanding the portion of the contact protruding from the resin film in a brim shape from the through hole. Further, if the contact is deformed within the elastic region during use, connection and disconnection can be repeated. In the prior art shown in FIG. 5, the super elastic metal sphere 1
Since the elastic deformation region of 9 is small, it is necessary to classify the super-elastic metal spheres 19 with high accuracy and make the particle diameters uniform, and if the wiring substrate has a warp such as an alumina substrate, follow all the super-elasticity. It is difficult to obtain electrical connection with the elastic metal balls 19. However, in the connector for electrical connection according to the present invention, since the contact is made of elastic rubber, the contact can be largely deformed, that is, it is not necessary to strictly align the protruding length of the contact from the plate surface of the resin film, Further, for example, even if the flatness of the electrode forming surface of the land grid array or the wiring substrate is poor and the positional accuracy of the plurality of electrodes to be connected is poor, it is possible to connect them well. In addition,
When using the contact with a large deformation like this,
For example, when the liquid rubber is printed, the mask may be thickened and the liquid rubber may be printed to increase the protruding length of the contact from the plate surface of the resin film.

[Brief description of drawings]

FIG. 1 is a sectional perspective view showing an embodiment of an electrical connection connector according to the present invention.

FIG. 2 is a sectional view showing a method of manufacturing an electrical connection connector according to an embodiment of the present invention.

FIG. 3A is a sectional view showing a state before connection using an embodiment of an electrical connector according to the present invention, and B is a sectional view showing a state after connection of A.

FIG. 4 is a cross-sectional view showing a connection using a conventional anisotropic conductive film.

FIG. 5 is a cross-sectional view showing a connection using a conventionally proposed anisotropic conductive sheet.

[Explanation of symbols]

 31 Resin Film 32 Through Hole 33 Contact 34 Connector for Electrical Connection

Claims (2)

[Claims] 1. A resin film having a plurality of through-holes formed therein, and an elastic rubber in which conductive particles are dispersed, filled in the through-holes and protruding from both sides of the resin film to form a joint surface. A connector for electrical connection, which has a plurality of contacts and. 2. A connector for electrical connection according to claim 1, wherein a portion of the contact protruding from the resin film extends like a collar from the through hole.