JP3084427B2 - Connector for electrical connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC package,
Electricity for electrically connecting a planar terminal disposed on a terminal surface of an electric / electronic component such as a C chip, a printed wiring board, a wiring board, etc. to a corresponding planar terminal disposed on a terminal surface of the corresponding electric / electronic component. The present invention relates to a connector for connection.

[0002]

2. Description of the Related Art Conventionally, land grid arrays (ICs)
A kind of package), electric / electronic components such as IC chips and flexible printed wiring boards, and electric / electronic components such as wiring boards and subcarriers.
An anisotropic conductive sheet has been proposed as a connector for electrically connecting an electronic component. Using a conventional anisotropic conductive sheet, the electrodes on the wiring board and the IC chip (or IC
FIG. 4 shows an example of connection with electrodes of a package. Since the internal structures of the IC chip and the IC package are not the gist of the present invention, only the electrodes thereof are shown in the cross section in the drawings, not in the cross section.

The anisotropic conductive sheet shown in FIG. 4 uses a conductive ball 9 having a diameter of several hundred μm as a conductive member (contact member).
These conductive balls 9 are fixed with an electrically insulating resin film 10. The conductive balls 9 are arranged and fixed on the resin film 10 such that the heads are exposed on both sides of the resin film 10. As the conductive sphere 9, a metal or alloy sphere, a sphere made of only conductive rubber, or an elastic sphere having a conductive film such as plating, for example, a plated resin bead is generally used. , Electricity to connect /
They are arranged in a pattern that matches the pattern of the terminals such as electrodes, pads, lands, etc. arranged on the terminal surface of the electronic component. 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. In addition, there is a case where a cylindrical body is used as a conductive member instead of a sphere.

As shown in FIG. 1A, an electrode 2 of a wiring board 1 is provided on one surface (the lower surface in the drawing) of the anisotropic conductive sheet.
Are arranged so as to face the predetermined conductive spheres 9, and the electrodes 3 of the IC package (or IC chip) 4 face the predetermined conductive spheres 9 on the other surface (the upper surface in the figure) of the anisotropic conductive sheet. And the IC package 4 is pressed against the wiring board 1 as shown in FIG. 2B, and the pressurized state (the anisotropic conduction between the electrode 3 of the IC package 4 and the corresponding electrode 2 of the wiring board 1) is obtained. (A state in which predetermined conductive balls 9 of the conductive sheet are sandwiched).

Since the head of the conductive ball 9 projects from both sides of the resin film 10, when the conductive ball 9 is pressed, the electrode 3 of the IC package 4 and the electrode 2 of the wiring board 1 facing the electrode are electrically connected through the conductive ball 9. Connected to. Therefore, it functions as an electrical connector. In this specification, components and elements such as an IC package, an IC chip, a printed wiring board (including a flexible board), a wiring board (including a flexible board), and a subcarrier are collectively referred to. Called "electric / electronic components"
In addition, the surfaces of these electric / electronic components from which electrodes are led out or formed, the surfaces from which electrode terminals are led out or formed, the surfaces on which connection pads and lands are formed, the surfaces from which connection terminals are led out or formed, and the like are collectively referred to. The term “terminal surface” is used, and the electrodes, pads, lands and the like are collectively referred to as “terminals”.

[0006]

The above-mentioned conventional anisotropically conductive sheet has a problem in that, when a sphere or column made of metal or alloy, or a sphere or column made only of conductive rubber is used as a conductive member, the conductive member becomes electrically conductive. Although the resistance is low and excellent,
As shown in the figure, when the terminals such as electrodes, pads and lands 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 reduced. If the position 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 conductive balls or columnar bodies of the anisotropic conductive sheet. However, it is not easy to obtain such a large pressing force, and therefore, there is a serious drawback that a connection failure occurs. In addition, there are also manufacturing difficulties, such as the need to make the height uniform using conductive balls or cylindrical bodies that have been classified with high accuracy.

On the other hand, when an elastic ball or a columnar body having a conductive film such as plating is used as the conductive member,
Since it can be deformed and pressed by a relatively small pressing force and can be greatly deformed, when connecting the terminals on the terminal surfaces of two electric / electronic components using this anisotropic conductive sheet, In addition, the flatness of the terminal surface is slightly
Even if the positional accuracy of a plurality of terminals on the terminal surface to be connected is poor, they can be connected well. However, since the conductive portion is limited to the surface (conductive film) of the elastic body, the electric resistance is slightly higher than when the above-mentioned conductive sphere or columnar body is used. There was a serious drawback of lack of reliability because of the high possibility of entry.

[0008] An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art, and to deform and press-contact with a small pressing force.
Another object of the present invention is to provide an electrical connector having low electrical resistance and good reliability during compression.

[0009]

According to the present invention, a connector for electrical connection is provided by a sheet-like holding member 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. And a plurality of through-holes formed in the holding body, and a plurality of fixing holes respectively fixed to these through-holes, both ends of which protrude from both surfaces of the holding body to form contact surfaces. A planar member of two electric / electronic parts to be connected as a conductive member, the conductive member comprising conductive rubber and microspheres of an elastic resin mixed in the conductive rubber; The connection between them is made electrically.

[0010]

According to the above arrangement, 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-like holding member. Low resistance is ensured by conductive rubber, and elasticity is ensured by deformable elastic resin microspheres. Therefore, it is arranged between the planar terminals of the two electric / electronic components to be connected, and when pressed, easily deforms with a small pressing force and satisfactorily press-contacts the terminals. Even if the position accuracy of the plurality of terminals on the terminal surface to be connected is poor, the terminals can be easily deformed while maintaining a low resistance, so that the terminals can be electrically connected with high reliability. In addition, since it is easily deformed by a small pressing force, the connection work between the planar terminals of the two electric / electronic parts becomes easy.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic perspective view, partially in section, showing an embodiment of an electrical connector according to the present invention. The connector for electrical connection according to the present embodiment includes a sheet-like holding member 11 made of an electrically insulating material, an electrode disposed on a terminal surface of an electric / electronic component (not shown) to be connected, an electrode lead-out terminal, a pad, and the like. At a position corresponding to a position of a planar terminal (not shown) such as a land, a plurality of through holes 12 are provided.
Are formed in the through-holes 12, respectively.
3. A substantially cylindrical conductive member 15 having elastic resin microspheres 14 mixed therein is attached to the holder 1 at both ends.
1 and is fixed so as to project from both surfaces.

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 the fixing member 2, for example, by filling the through-hole 12 of the holder 11 with a paste-like conductive member. The manner of connecting between the planar terminals of the two electric / electronic components using the connector having the above configuration is the same as that of the conventional example shown in FIG.
Here, the description is omitted.

Next, a specific example of the present invention will be described. An electrically insulating sheet-like holding member 11 having a thickness of 1
A transparent resin film made of 00 μm polyester and having through holes 12 each having a diameter of 250 μm formed at a position corresponding to the position of the terminal arranged on the terminal surface of the electric / electronic component to be connected, Conductive member 15
Two types were prepared, one in which resin beads having an average particle diameter of 20 μm were mixed with an Ag-based conductive paste, and the other in which resin beads having an average particle diameter of 50 μm were mixed, and the amounts thereof were changed. These two types of conductive members are cylindrical bodies having substantially the same diameter 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 and lower portions thereof respectively protruded from both surfaces of the resin film by approximately 50 μm. Note that the size of the resin film changes depending on the size of the terminal surface of the electric / electronic component to be connected. In this specific example, a size of 3 cm × 3 cm was used.

For the connector using these two types of cylindrical conductive members, the height (contact height) of the conductive member is set to 5
When the load required to compress to 0% was measured, it was as shown in FIG. In FIG. 2, the characteristic A indicated by Δ
Is a case where a conductive member mixed with resin beads having an average particle diameter of 20 μm is used.
This is a case where a conductive member mixed with 0 μm resin beads is used. As is clear from FIG. 2, it can be seen that the compression load required for deformation decreases as the blending amount of the resin beads increases. In addition, when the contact resistance at the time of compression was measured, when resin beads having an average particle diameter of 20 μm were mixed, several milliΩ,
When resin beads having an average particle size of 50 μm were mixed, the stability was extremely stable at more than ten milliohms, and no effect was observed due to an increase in the amount of the resin beads.

FIG. 3 shows the contact resistance per contact when the contact height of the conductive member is reduced to 50% and then unloaded. In FIG. 3, the characteristic C indicated by ● is a case where no resin beads are mixed, and the characteristic D indicated by ▲ is an average particle diameter of 20 μm.
Is the case where 8% by weight (wt%) of the resin beads are mixed, and the characteristic E indicated by Δ is the case where 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 the range until the contact resistance starts to increase as the blending amount of the resin beads increases increases, 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 size 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. Since it protrudes, low resistance is secured by the conductive rubber, and elasticity is secured by the deformable elastic resin microspheres. Therefore, it is arranged between the planar terminals of the two electric / electronic components to be connected, and when pressed, easily deforms with a small pressing force and satisfactorily press-contacts the terminals. Even if the position accuracy of the plurality of terminals on the terminal surface to be connected is poor, the terminals can be easily deformed while maintaining a low resistance, so that the terminals can be electrically connected with high reliability. In addition, since it is easily deformed by a small pressing force, the connection work between the planar terminals of the two electric / electronic parts becomes easy.

The above embodiment is merely an example of the present invention. Therefore, the shape, structure, material, and the like of the connector, the sheet-like holding member, the conductive member, and the like constituting the connector can be variously changed as necessary. It can be transformed.

[0018]

As described above, the electrical connector according to the present invention has a conductive member functioning as a contact, in which deformable elastic resin microspheres are mixed into a low-resistance conductive rubber. And these conductive members are fixed to the through-holes of a sheet-like holding member made of an electrically insulating material while projecting from both surfaces thereof, so that the two electric / electronic parts to be connected have a planar shape. When the terminals are electrically connected, the conductive member is easily deformed by a small pressing force and satisfactorily pressed against the terminals, so that the terminals can be electrically connected with high reliability.
Also, even if the flatness of the terminal surface is somewhat poor, and the positional accuracy of the plurality of terminals on the terminal surface to be connected is poor, the conductive member easily deforms while maintaining low resistance, and the contact resistance is stable. The reliability does not decrease. further,
Since it is easily deformed by a small pressing force, there are many remarkable effects such as easy connection work between the planar terminals of two electric / electronic parts.

[Brief description of the drawings]

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

FIG. 2 is a characteristic diagram showing a relationship between a load required to compress the height of a conductive member of the electrical connection connector according to the present invention to 50% and a blending amount of microbeads.

FIG. 3 is a characteristic diagram showing the relationship between the contact resistance and the compounding amount of microbeads when the height of the conductive member of the electrical connection connector according to the present invention is reduced to 50% and then unloaded.

4A and 4B are diagrams for explaining a mode of connecting terminals of a wiring board and terminals of an IC package using a conventional anisotropic conductive film, wherein FIG. 4A shows a state before connection, and FIG. It is each schematic sectional drawing which shows a state.

[Explanation of symbols]

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

Claims (1)

(57) [Claims] 1. A terminal surface on which planar terminals of an electric / electronic component such as an IC package, an IC chip, a printed wiring board, and a wiring board are disposed, and a terminal on which a planar terminal of a corresponding electric / electronic component is disposed. A connector for electrically connecting between the planar terminals of the terminal surfaces, the sheet-shaped holder made of an electrically insulating material, and a terminal of an electric / electronic component to be connected. At a position corresponding to the position of the planar terminal disposed on the surface, a plurality of through holes formed in the holding body, and fixed to the through holes, respectively, and form contact points by projecting from both sides of the holding body. And a plurality of conductive members, wherein the conductive members are made of conductive rubber mixed with microspheres of elastic resin.