JPH07321490A - Electric connector - Google Patents

Abstract

PURPOSE:To obtain a electric connector for connecting a surface mounted LSI stably with a circuit board while preventing intrusion of internal noise, e.g. crosstalk, and external noise effectively. CONSTITUTION:Metal wires 1, each surrounded by an insulating elastomer layer 5 while exposing one protruding end 3 and the other wire bonded end 2, are planted in parallel at a constant pitch. The metal wires 1 are surrounded by an insulating elastomer layer 6 containing an electromagnetic wave shielding material or further surrounded entirely by a frame 7 of an insulating elastomer containing an electromagnetic shielding material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connector having an electromagnetic wave shielding function which is used when a surface mount type LSI (hereinafter referred to as LSI) is connected to an electronic circuit board for inspection or practical use.

[0002]

2. Description of the Related Art Conventionally, to connect an LSI to an electronic circuit board for inspection or the like, the terminals of the LSI are connected to the terminals of the electronic circuit board by using a holding jig, or are directly connected by soldering. There is.

[0003]

However, the LSI
With the increase in the number of terminals (increased number of pins), miniaturization of terminal pitch, and higher speed of operation, electromagnetic interference due to noise generated from itself such as crosstalk noise between terminals or noise invading from the outside, etc. Has become. At present, measures are taken such as providing an optimum noise filter separately on the circuit board, but the circuit and the device are expensive, and these noises cannot be completely suppressed.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an electrical connector which solves such problems, and more particularly to an LSI for use at high frequency with a multi-terminal of 200 pins or more with a terminal pitch of 0.5 mm or less. The purpose of the present invention is to provide an electrical connector suitable for connection, in which metal wires erected parallel to each other at a constant pitch are exposed by embedding them in an insulating elastomer layer with both ends exposed. An electrical connector having one end formed in a convex shape and the other end formed by a wire bonder, characterized in that the insulating elastomer layer includes an electromagnetic wave shielding material except around the metal wire. The main point is the connector.

The electrical connector of the present invention will be described below with reference to the drawings. As shown in FIGS. 1A and 1B, conductive metal wires 1 are embedded in parallel in an elastomer layer at a constant pitch. . At this time, both ends of the metal wire 1 are exposed from the surface of the elastomer layer, but one end is formed by the wire bonder, so the bond end 2
Since the other end is laser-processed, it becomes a spherical end 3. Thus, the elastomer layer is the cylindrical insulating elastomer layer 4 around the metal wire 1, but the insulating layer around the metal wire 1 further includes an electromagnetic wave shielding material (hereinafter referred to as a shielding elastomer layer).
It is 5.

In order to further increase the shielding property, FIG. 1 (c)
As shown in FIG. 7, a frame 7 made of an insulating elastomer containing an electromagnetic wave shielding material around the electric connector 6.
May be provided. However, if the shielding property of the frame 7 is sufficient, the shielding elastomer layer 5 can be omitted as shown in FIG.

Examples of the insulating elastomer include thermosetting resins such as silicone resin, core resin and epoxy resin, and thermoplastic resins such as polyethylene, ABS and polycarbonate. Two or more of the above-mentioned insulating elastomers can be used. It may be a mixture. These insulating elastomers may contain various commonly used improving additives such as heat stabilizers and facial dyes.

The shield elastomer layer contains a conductive filler in order to make the insulating elastomer have a radio wave absorption performance, but this may be a so-called conductive material, particularly a short fiber metal such as brass, aluminum or iron. A fiber or a carbon fiber having a relatively large aspect ratio of the length of the fiber to the diameter is used.
When the range which is preferably used is illustrated, the diameter is 5 to 20.
It is a short fiber having a length of 0 μm and a length of 0.1 to 20 mm. However, considering the workability and conductivity of the shielding elastomer layer, the compounding ratio is preferably insulative elastomer: conductive filler = 100: 10 to 200 (weight ratio).

Further, in order to have a magnetic loss effect, ferrite is further contained. The ferrite used in the present invention is represented by the general formula MFeO ₃ (M is Fe, Mn, Ni,
A divalent metal powder such as Co),
Generally, the main component is iron ferrite Fe ₃ C ₄ .

When a conductive filler is contained as an electromagnetic wave absorbing material, a high electromagnetic wave absorbing property is exhibited, but when ferrite is further contained, a high magnetic loss is caused, and a synergistic effect of the both causes a remarkable noise prevention effect. The compounding ratio is preferably insulating elastomer: ferrite: conductive filler = 100: 20 to 200: 10 to 200. If the amount of ferrite and conductive filler is less than the compounding ratio of this formula, the electromagnetic wave shielding property of the electrical connector is not sufficient, and if it is too large, the insulation between metal wires is impaired and the workability is poor, and the electrical connector is compressed and connected. Is not preferable to.

When an electric connector is used, it is necessary to compress it by about 10% in order to make a stable connection. Therefore, the shielding elastomer layer has a Shore A hardness of 30 ° or more.
It should be 0 ° or less, preferably 30 ° or more and 60 ° or less. Further, as shown in FIG. 1 (d), when the shield elastomer layer is omitted and the insulating elastomer layer is provided with the frame on the outer side, the frame is not compressed. It is preferably 50 ° or more, more preferably 60 ° or more. In order to obtain a desired Shore A hardness of 60 ° or more, insulating elastomer: ferrite: conductive filler = 100: 100 to 200:
The compounding ratio may be 60 to 200. Shore A hardness 6
If the angle is 0 ° or more, it is possible to make a positioning hole in the frame, and it is also useful for reliable positioning, positioning, and prevention of erroneous installation, especially for connections between other pinned and miniaturized electronic circuit boards. be able to.

[0012]

In the electrical connector of the present invention, the electrical continuity is maintained by the metal wires, and the insulating elastomer layer around the electrical wires ensures the insulation between the metal wires. However, in order to further improve the electromagnetic wave absorption performance, the shielding elastomer layer further around the electromagnetic wave shielding material, for example, a short fiber conductive filler, is contained in the insulating elastomer, and the magnetic loss effect can be obtained by the above-mentioned method. Since it contains the conductive filler and the magnetic wave shield material such as ferrite, it exhibits excellent electromagnetic wave absorbability and can prevent generation of crosstalk noise and intrusion of noise from the external environment.

[0013]

Example 1 As shown in FIGS. 1A and 1B, a metal wire 1 (having a diameter of 76 μm and a length of 3 mm) was formed on a copper forming substrate 8 having a thickness of 0.5 mm by a known wire bonder. ) At a constant pitch (1.0 mm pitch) of 26 mm
It was erected in a range of x26 mm to obtain a bond end portion 2. The tip of the metal wire 1 is irradiated with a known laser beam to obtain the spherical end portion 3, and then the two-component silicone rubber KE-109.
2 kg of insulative elastomer containing A / B (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) mixed with A liquid and B liquid in equal proportions is surrounded by the dipping method only around the metal wire 1 to expose the spherical end 4. Then, the insulating elastomer layer 4 having a thickness of 200 μm was formed to form a cylindrical insulating elastomer layer 4. Then, in 2kg of insulating elastomer, average diameter is 60μm, length is 3m
800 g of aluminum fiber of m, mixed and stirred by a dissolver and dispersed, and the insulating elastomer layer so as not to fall the metal wire 1 surrounded by the insulating elastomer layer 4 on the forming substrate 8. The same thickness as above was injected to obtain a shielding elastomer layer 5 of 30 mm × 30 mm. Then, the copper forming substrate 8 is removed by etching with ferric chloride to remove the electrical connector 6 of the present invention.
Was completed. Using this electric connector, as shown in FIG. 2, the terminal 10 of the LSI 9 and the spherical terminal 3 of the metal wire 1, the terminal 12 of the inspection electronic circuit board 11 and the metal wire 1 are used.
Connect the bond end 2 of the and connect the ground terminal 13 of the LSI 9.
And the ground terminal 14 of the inspection circuit board 11 are brought into contact with the shielding elastomer layer 5. If the LSI 9 is evenly weighted and the electrical connector is compressed by 10%, stable connection can be obtained, and at the same time, noise caused by the inside such as crosstalk and noise from the external environment can be effectively shielded. .

[0014]

Example 2 As shown in FIG. 1C, an elastomer frame 7 containing an electromagnetic wave shielding material was produced. That is, polypropylene powder (Mitsui Noblen JHN, manufactured by Mitsui Toatsu Chemicals, Inc., trade name) 3 kg, ferrite 5.2 kg
And 1.8 kg of an aluminum fiber having an average diameter of 60 μm and a length of 3 mm are added, stirred and dispersed by a dissolver, and then extruded by a screw extruder into pellets, and then by an injection molding machine, a thickness of 5.0 mm and a side of 50 mm. A square plate was obtained. 40 mm x 40 in the center of this plate
A frame 7 having a Shore A hardness of 60 ° was obtained by hollowing out into mm. This frame 7 has a thickness of 0.4 mm, and the length and width are 5
The insulating elastomer layer 4 and the shielding elastomer layer 5 were formed 0.5 mm higher than the frame 7 in the same manner as in Example 1 by placing it on a 0 mm copper forming substrate 8. Then, the forming substrate 8 was removed by etching with ferric chloride to obtain the electrical connector 6 of the present invention with a frame. When the same inspection as in Example 1 was performed, the same effect as in Example 1 was obtained. It was

[0015]

By using the electrical connector of the present invention, the LS
When the terminal of I and the terminal of the electronic circuit board for inspection or practical use are connected, stable connection can be easily made, and at the same time, noise caused by the inside such as crosstalk and noise that causes malfunction due to the external environment are caused by the metal of the electrical connector. It was possible to effectively prevent intrusion from the wire.

[Brief description of drawings]

FIG. 1A is a plan view of an electric connector of the present invention,
(B) is sectional drawing which follows the XX line of (a), (c) is sectional drawing of the other electrical connector of this invention, (d) is sectional drawing of another electrical connector of this invention.

FIG. 2 is an explanatory diagram when using this electric connector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Metal wire 2 ... Bond end 3 ... Spherical end 4 ... Insulating elastomer layer 5 ... Shielding elastomer layer 6 ... Electrical connector 7 ... Frame 8 ... Forming substrate 9 ... LSI 10 ... Terminal 11 ... Inspection electronic circuit Substrate 12 ... Terminal 13 ... Ground terminal 14 ... Ground terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroto Komatsu 1-406-1 Yoshino-cho, Omiya-shi, Saitama 1 Shin-Etsu Polymer Co., Ltd. Tokyo factory

Claims (2)

[Claims] 1. A metal wire standing upright in parallel with each other at a constant pitch is embedded in an insulating elastomer layer with its both ends exposed, and one exposed end is formed in a convex shape, and the other end is exposed. An electrical connector, the portion of which is formed by a wire bonder, wherein the insulating elastomer layer includes an electromagnetic wave shielding material except around the metal wire. 2. The electrical connector according to claim 1, wherein the electromagnetic wave shielding material is at least one selected from a conductive filler and ferrite.