JPH07161399A - Connector for electric connection - Google Patents

Abstract

PURPOSE:To provide a connector for electric connection which can be deformed and press-connected by low pressing force and has low electric resistance and has high reliability at the time of compressing. CONSTITUTION:In a sheet-like holding body 11 made of an insulating material, a plurality of through holes 12 are formed at positions respectively corresponding to the positions of plane-like terminals such as electrodes, electrode lead terminals, pads, lands, etc., arranged on a terminal plane of an electric/electronic part to be connected. Almost cylindrical conductive parts 15 are fixed in respective through holes 12 in the way both ends of the parts are projected out of both sides of the holding body 11. Each conductive part 15 is made of conductive rubber 13 to which fine spherical bodies 14 made of elastic resin are added.

Description

Detailed Description of the Invention

[0001]

This invention relates to an IC package, I
Electricity for electrically connecting a planar terminal arranged on the terminal surface of an electric / electronic component such as a C chip, a printed wiring board, or a wiring board to a planar terminal arranged on the corresponding terminal surface of the electric / electronic component. The present invention relates to a connector for connection.

[0002]

2. Description of the Related Art Conventionally, a land grid array (IC
A type of package), IC chips, electrical / electronic components such as flexible printed wiring boards, and electrical / electronic parts such as wiring boards and subcarriers.
An anisotropic conductive sheet has been proposed as a connector for electrically connecting electronic components. An electrode and an IC chip (or IC) on a wiring board using a conventional anisotropic conductive sheet
An example of connecting the electrodes of the package) is shown in FIG. Since the internal structures of the IC chip and the IC package are not the gist of the present invention, in the drawings, these electrodes are not shown in cross section, but only their electrodes are shown in cross section.

The anisotropic conductive sheet shown in FIG. 4 uses a conductive sphere 9 having a diameter of several hundred μm as a conductive member (contact member).
These conductor balls 9 are fixed by an electrically insulating resin film 10. The conductor balls 9 are arranged and fixed on the resin film 10 so that the heads of both sides of the resin film 10 are exposed. As the conductor sphere 9, a sphere made of metal or alloy, a sphere made of only conductive rubber, or an elastic sphere having a conductive film such as plating, for example, plated resin beads is generally used. , Electricity to connect /
The electrodes, pads, lands, etc. arranged on the terminal surface of the electronic component are arranged in a pattern that matches the pattern of the terminals. That is, it is fixed to the resin film 10 at a position corresponding to the terminal arranged on the terminal surface of the electric / electronic component to be connected. There is also a conductive member that uses a columnar body instead of a sphere.

On one surface (lower surface in the figure) of this anisotropically conductive sheet, as shown in FIG.
Are arranged so as to face the predetermined conductive balls 9, and the electrodes 3 of the IC package (or IC chip) 4 face the predetermined conductive balls 9 on the other surface (the upper surface in the figure) of the anisotropic conductive sheet. , The IC package 4 is pressed to the wiring board 1 side as shown in FIG. 3B, and the conductive state is anisotropic between the electrode 3 of the IC package 4 and the corresponding electrode 2 of the wiring board 1. (A state in which a predetermined conductor sphere 9 of the elastic sheet is pressed) is held.

Since the conductor sphere 9 has its head protruding from both sides of the resin film 10, when pressure is applied, the electrode 3 of the IC package 4 and the electrode 2 of the wiring substrate 1, which faces the electrode 3 through the conductor sphere 9, are electrically connected. Connected to. Therefore, it functions as an electrical connector. Here, in the present specification, components and elements such as an IC package, an IC chip, a printed wiring board (including a flexible one), a wiring board (including a flexible one), a subcarrier, etc. are collectively referred to. Called "electrical / electronic parts",
In addition, a surface on which electrodes of these electric / electronic components are led out or formed, a surface on which electrode terminals are led out or formed, a surface on which connection pads or lands are formed, a surface on which connection terminals are led out or formed, etc. are collectively referred to. Then, the electrodes, pads, lands, etc. are collectively referred to as "terminals".

[0006]

The above-mentioned conventional anisotropic conductive sheet is electrically conductive when a metal or alloy sphere or columnar body, or a sphere or columnar body made of only conductive rubber is used as a conductive member. The resistance is low and excellent, but Fig. 4
As shown in Fig. 2, when the terminals such as electrodes, pads, lands, etc. arranged on the terminal surfaces of two electric / electronic components are connected to each other using this anisotropic conductive sheet, the flatness of the terminal surfaces is If the positioning accuracy of the plurality of terminals on the terminal surface to be connected is poor to some extent, a large pressing force is required to elastically deform the conductor sphere or the cylindrical body of the anisotropic conductive sheet. However, it is not easy to obtain such a large pressing force, and thus there is a serious drawback that a connection failure occurs. In addition, there are also problems in manufacturing such that it is necessary to make the height uniform by using conductor balls or columnar bodies that are classified with high accuracy.

On the other hand, when an elastic sphere or a columnar body having a conductive film such as plating is used as the conductive member,
It can be deformed and pressed into contact with a relatively small pressure, and can be deformed greatly. Therefore, when using this anisotropic conductive sheet, the terminals on the terminal surfaces of two electric / electronic parts can be connected to each other. In addition, the flatness of the terminal surface is somewhat poor,
Moreover, even if the positional accuracy of the plurality of terminals on the terminal surface to be connected is poor, they can be connected well. However, since the conductive part is limited to the surface of the elastic body (conductive film), the electric resistance is slightly higher than that when the above conductive sphere or columnar body is used, and cracks are formed in the conductive film during deformation. It has a serious drawback of being unreliable because it is likely to enter.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to enable deformation and pressure contact with a small pressing force,
Another object of the present invention is to provide a connector for electric connection, which has low electric resistance and good reliability during compression.

[0009]

According to the present invention, a connector for electrical connection is provided with a sheet-like holder made of an electrically insulating material, and a position of a planar terminal arranged on a terminal surface of an electric / electronic component to be connected. A plurality of through holes formed in the holding body at positions corresponding to the plurality of through holes formed in the holding body, and a plurality of both ends fixed to the through holes and protruding from both sides of the holding body to form a contact surface A planar terminal of two electric / electronic parts, which is composed of a conductive member, which is made of conductive rubber mixed with elastic resin microspheres, and these conductive members should be connected as contacts. It electrically connects the two.

[0010]

According to the above structure, the conductive member functioning as a contact is made of conductive rubber mixed with elastic resin microspheres, and protrudes from both sides of the sheet-shaped holding member. The conductive rubber ensures low resistance, and the deformable elastic resin microspheres ensure elasticity. Therefore, it is arranged between the planar terminals of the two electric / electronic components to be connected and easily deforms with a small pressing force when pressed to favorably contact the terminals. Even if the position accuracy of the plurality of terminals on the terminal surface to be connected is poor, the terminals are easily deformed while maintaining low resistance, so that the terminals can be electrically connected with high reliability. Further, since it is easily deformed by a small pressing force, the connecting work between the planar terminals of the two electric / electronic components becomes easy.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic partial perspective view showing an embodiment of an electrical connector according to the present invention. The electrical connector of this embodiment includes a sheet-shaped holder 11 made of an electrically insulating material, an electrode, an electrode lead-out terminal, a pad arranged on a terminal surface of an electric / electronic component (not shown) to be connected, A plurality of through holes 12 are formed at positions corresponding to the positions of the planar terminals (not shown) such as lands.
And the conductive rubber 1 is formed in each of the through holes 12.
3 is a conductive member 15 having a substantially columnar shape, in which the elastic resin microspheres 14 are mixed.
1 has a configuration in which it is fixed so as to project from both sides.

The conductive member 15 is connected to the through hole 1 of the holder 11.
Any method can be used as the method of fixing to No. 2, for example, by filling the through hole 12 of the holding body 11 with a paste-like conductive member. Since the mode of connecting the planar terminals of the two electric / electronic components using the connector having the above-described configuration is the same as that of the conventional example shown in FIG. 4,
The description is omitted here.

Next, a specific example of the present invention will be described. As the electrically insulating sheet-like holder 11, the thickness 1
A transparent resin film made of polyester having a thickness of 00 μm and having through holes 12 each having a diameter of 250 μm formed at positions corresponding to the positions of the terminals arranged on the terminal surface of the electric / electronic component to be connected are used. Conductive member 15
As the Ag conductive paste, two types were prepared, that is, a mixture of resin beads having an average particle size of 20 μm and a mixture of resin beads having an average particle size of 50 μm were prepared, and the compounding amounts thereof were changed and used. The shapes of the two kinds of conductive members are cylindrical bodies having a diameter substantially the same as the diameter of the through hole 12, and were formed by filling the through hole of the resin film. Each conductive member was fixed to the resin film such that the upper portion and the lower portion thereof protruded from both sides of the resin film by approximately 50 μm. The size of the resin film varies depending on the size of the terminal surface of the electric / electronic component to be connected. In this specific example, the size of 3 cm × 3 cm was used.

For a connector using these two types of columnar conductive members, the height of the conductive member (contact height) is 5
When the load required to compress to 0% was measured, it was as shown in FIG. In FIG. 2, characteristic A indicated by ■
Is the case where a conductive member mixed with resin beads having an average particle size of 20 μm is used, and the characteristic B shown by □ is an average particle size of 5
This is a case where a conductive member mixed with 0 μm resin beads is used, and it is clear from FIG. 2 that the compressive load required for deformation decreases as the compounding amount of resin beads increases. The contact resistance at the time of compression was measured and found to be several milliΩ when resin beads having an average particle size of 20 μm were mixed.
When the resin beads having an average particle diameter of 50 μm were mixed, the resin beads were extremely stable at a dozen millimeters Ω, and no influence was observed due to an increase in the compounding amount of the resin beads.

FIG. 3 shows the contact resistance per contact when the contact height of the conductive member is compressed to 50% and then unloaded. In FIG. 3, the characteristic C indicated by ● is the case where the resin beads are not mixed, and the characteristic D indicated by ▲ is the average particle diameter of 20 μm.
8% by weight (wt%) of the resin beads are mixed, and the characteristic E shown by {circle around (3)} is when 10% by weight of the resin beads having an average particle diameter of 20 μm are mixed. From the characteristics of FIG. 3, it can be seen that as the compounding amount of the resin beads is increased, the range until the contact resistance starts to increase becomes wider and the elastic region expands. Although not shown, the same tendency was observed when a conductive member mixed with resin beads having an average particle diameter of 50 μm was used.

As described above, according to the present invention, the conductive member functioning as a contact is made of conductive rubber mixed with deformable elastic resin microspheres, and the sheet-shaped holder is provided on both sides thereof. Since it projects, the conductive rubber ensures a low resistance, and the deformable elastic resin microspheres ensure elasticity. Therefore, it is arranged between the planar terminals of the two electric / electronic components to be connected and easily deforms with a small pressing force when pressed to favorably contact the terminals. Even if the position accuracy of the plurality of terminals on the terminal surface to be connected is poor, the terminals are easily deformed while maintaining low resistance, so that the terminals can be electrically connected with high reliability. Further, since it is easily deformed by a small pressing force, the connecting work between the planar terminals of the two electric / electronic components becomes easy.

The above embodiment is merely an example of the present invention. Therefore, the shape and structure of the connector, the sheet-shaped holder, the conductive member, etc., the material, etc., are variously changed and necessary. It can be transformed.

[0018]

As described above, the connector for electrical connection according to the present invention has, as a conductive member functioning as a contact, a conductive resin having a low resistance mixed with deformable elastic microspheres. , And these conductive members are fixed to the through holes of the sheet-shaped holder made of an electrically insulating material while protruding from both sides thereof, the planar shape of the two electric / electronic parts to be connected When electrically connecting the terminals, the conductive member is easily deformed by a small pressing force to satisfactorily press contact with the terminals, so that the terminals can be electrically connected with high reliability.
Even if the flatness of the terminal surface is somewhat poor and the positioning accuracy of the terminals on the terminal surface to be connected is poor, the conductive member is easily deformed while maintaining low resistance, and the contact resistance is stable. Reliability, there is no loss of reliability. further,
Since it is easily deformed by a small pressing force, there are many remarkable effects such as facilitating the connecting work between the planar terminals of the two electric / electronic components.

[Brief description of drawings]

FIG. 1 is a schematic perspective view, partly in section, showing an embodiment of an electrical connector according to the present invention.

FIG. 2 is a characteristic diagram showing the relationship between the load necessary to compress the height of the conductive member of the electrical connecting connector according to the present invention to 50% and the compounding amount of micro beads.

FIG. 3 is a characteristic diagram showing the relationship between the contact resistance when the height of the conductive member of the electrical connecting connector according to the present invention is compressed to 50% and then the load is removed, and the compounding amount of the microbeads.

FIG. 4 is a diagram for explaining a mode in which terminals of a wiring board and terminals of an IC package are connected using a conventional anisotropic conductive film, (a) is a state before connection, and (b) is a connection. It is each a schematic sectional view showing a state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiring board 2 Wiring board electrode 3 IC package electrode 4 IC package 9 Conductor sphere 10 Resin film 11 Sheet-like holder 12 Through hole 13 Conductive rubber 14 Resin microsphere 15 Conductive member

Claims (1)

[Claims] 1. A terminal surface on which planar terminals of electric / electronic components such as IC packages, IC chips, printed wiring boards, and wiring boards are arranged, and terminals on which corresponding planar terminals of electric / electronic components are arranged. A sheet-like holder made of an electrically insulating material, and a terminal of an electric / electronic component to be connected, in an electrical connection connector that is disposed between the planar surface of these terminal surfaces and electrically connects between the planar terminals of these terminal surfaces. A plurality of through holes formed in the holder at positions corresponding to the positions of the planar terminals arranged on the surface, and fixed to these through holes, respectively, and projecting from both sides of the holder to form contact surfaces. A plurality of electrically conductive members, wherein the electrically conductive member is made of electrically conductive rubber mixed with elastic resin microspheres.