JP2002298950A - Electric connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connector capable of certainly and stably ensuring electric conduction even if the compression load is small. SOLUTION: Elastic bodies 2 are closely adhered to both surfaces of an insulation plate or sheet 1 as a core material of the electric connector 10. Projection parts 2a are formed on the elastic bodies 2 in the state that they stand in row lengthwise and breadthwise such that upper and lower surfaces are opposed to each other. A through hole electrode 1a is formed on the insulation sheet 1 near the projection parts 2a. A copper paste 3 for flattening the through hole electrode 1a is filled in the through hole electrode 1a and a gold plating is applied to a surface thereof. One of connection patterns 4 is extended/formed on an upper surface of the through hole electrode 1a and the other of connection patterns 4 is extended/formed on a lower surface of the through hole electrode 1a by a conductive adhesive or a solder 5. The respective connection patterns 4 arrive at a top surface of the projection parts 2a. In the case where the electric connector is clamped between upper and lower electrodes of an electronic part, the upper and lower connection patterns 4 are press-contacted with the upper and lower electrodes to realize a conduction while the elastic bodies are made flexible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connector which is held between a plurality of vertically opposed electrodes to conduct the corresponding electrodes.

[0002]

2. Description of the Related Art In recent years, with the miniaturization of electronic devices, a technology for surface mounting electronic components on a circuit board has been developed and applied to various electronic components. Further, in this mounting, there is a demand for a solderless method for achieving electrical conduction without soldering as much as possible. For example, when a flat pack semiconductor is mounted on a circuit board, electrodes facing up and down are connected via an electrical connector. An example of such a conventional electrical connector will be described with reference to the drawings. 5 is a plan view showing a conventional electrical connector, FIG. 6 is a partial sectional view thereof, and FIG. 7 is a partial sectional view showing the operation of the electrical connector.

[0003] First, the configuration of the electric connector will be described. 5 and 6, reference numeral 70 denotes an electrical connector, and reference numeral 71 denotes a sheet body made of an insulating elastic material such as silicone rubber. Reference numeral 72 denotes a linear body made of a conductive member such as a metal fiber. The linear bodies 72 are randomly gathered so as to be separated from each other in the plane direction of the sheet body 71, and penetrate the sheet body 71 substantially vertically in the thickness direction,
It is buried so that both end faces are exposed from the sheet body 71.

Next, the operation of the electric connector will be described. In FIG. 7, reference numeral 80 denotes a semiconductor package, for example, and a plurality of terminal electrodes 80a are exposed on the lower surface. 9
Reference numeral 0 denotes, for example, a circuit board on which an electrode pattern 90a corresponding to each electrode 80a is formed. The semiconductor package 80 is disposed on the circuit board 90 such that the corresponding electrodes face each other, and is mounted under pressure with the electrical connector 70 interposed therebetween. Therefore, each electrode 80a and the corresponding electrode pattern 90a overlap each other in the plane direction,
As long as the uncorresponding electrodes do not overlap with each other, the linear body 72 is maintained substantially perpendicular even if they are slightly displaced from each other, so that there is no occurrence of conduction between the uncorresponding electrodes. Therefore, such a conventional electrical connector 70
Is an anisotropic conductive sheet having a property of conducting only in a substantially vertical direction, and is used by being cut out from a large format into a shape corresponding to a planar shape on which electrodes are arranged.

FIG. 8 is a sectional view showing another conventional electric connector. In FIG. 8, reference numeral 75 denotes an electrical connector;
76 is a sheet body. Reference numeral 77 denotes a conductive linear body, which is different from the linear body 72 of the electrical connector 70 in that the linear body 7
7 are inclined by a fixed amount s in a fixed direction of the plane, and are aligned in the plane direction. That is, the sheet body 76
Both end surfaces of the linear body 77 on the upper and lower surfaces have an offset amount s. Therefore, when a semiconductor package is mounted on a circuit board using the electric connector 75, it is necessary to offset the corresponding electrodes by s in a certain direction.

[0006]

However, in the case of the former electrical connector, it is necessary to embed the linear body at a higher density as the electrode area becomes smaller. The higher the density of the linear body, the more the elasticity of the sheet body is lost.Therefore, if the electrode surface is not on the same surface, a linear body that does not sufficiently contact the electrode surface will occur and conduction will be unstable. Become. To prevent this, it is necessary to compress the sheet with a high load, and it is difficult to obtain stable contact. Further, in the case of the conventional electric connector such as the latter, since the linear body is arranged obliquely, there is an advantage that the elasticity of the sheet body is maintained and the conduction is ensured even under a light load, but in the layout of the connection electrodes, Since it is necessary to consider the offset, electrode design becomes difficult.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an electric connector which can surely and stably secure electrical conduction even when a compressive load is small. That is.

[0008]

Means for Solving the Problems In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is directed to an insulating sheet body and both end faces penetrating in the thickness direction of the insulating sheet body. In an electrical connector comprising a plurality of conductive members embedded so as to be exposed on the surface of a sheet body, projection-like elastic bodies arranged vertically and horizontally are disposed so as to face upper and lower surfaces of the insulating sheet body. A through-hole electrode is formed in the insulating sheet body in the vicinity of the elastic body, and a metal foil strip bonded to the through-hole electrode is disposed along the surface of the projecting elastic body on the upper and lower surfaces of the insulating sheet to the top surface. It is characterized by being provided.

According to a second aspect of the present invention, in the first aspect of the invention, the through-hole electrode is a hole-filled through-hole, and the upper and lower electrodes are flat.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the metal foil strip is joined to the through-hole electrode via a conductive adhesive or solder. It is characterized by being.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electrical connector according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view of an electric connector according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view taken along a line AA in FIG. 1, and FIG. 3 is a cross-sectional view illustrating the operation of the electric connector. FIG. 4 is a partial cross-sectional view illustrating the procedure for manufacturing the electrical connector.

First, the configuration of the electrical connector will be described. 1 and 2, reference numeral 10 denotes an electrical connector. One electric connector 10 is, for example, 10 cm × 10 c
Although it is manufactured in a large format of m, when it is used for mounting electronic components, it is cut into necessary sizes as needed. Reference numeral 1 denotes an insulating plate or sheet as an insulating sheet made of, for example, a glass epoxy resin plate, a polyimide resin plate, or the like as a core material of the electrical connector 10. Numeral 2 denotes an elastic body made of a material such as silicone rubber, urethane rubber, polyester rubber, fluorine rubber or the like.
Covers both sides and is in close contact. The elastic body 2 has a protrusion 2a
Are arranged in rows and columns at a pitch of, for example, 1 mm.

The insulating plate or sheet 1 near the projection 2a is provided with a through-hole electrode 1a which is a fill-in type through-hole, and 3 is filled in the through-hole electrode 1a to flatten the upper and lower through-hole electrodes 1a. Paste as a filling material for filling. The surface of the through-hole electrode 1a is plated with gold. Reference numeral 4 denotes a connection pattern as a conductive member for connecting an electrode part of the electronic component and a wiring pattern of a circuit board on which the electronic part is mounted. For example, a metal foil made of a metal such as copper, phosphor bronze, spring white, and SUS 4a, the surface of which is plated with gold 4b.
The connection pattern 4 is provided along the surface of the elastic body 2 from the upper and lower surfaces of the through-hole electrode 1a to the top surface of the protrusion 2a. Reference numeral 5 denotes a conductive adhesive or solder that joins the metal foil 4a band and the copper paste 3.

Next, the operation of the electric connector will be described with reference to FIG. In FIG. 3, reference numeral 30 denotes an electrode portion 30a.
Is a circuit board on which the semiconductor package 30 on which the electrode pattern 40a is formed so as to face the electrode portion 30a is mounted. The electrical connector 10 cut to a size suitable for the place to be used is mounted so as to be sandwiched between the semiconductor package 30 and the circuit board 40. Accordingly, each connection pattern 4 included in the plane area of each electrode portion 30a and electrode pattern 40a is formed.
At the same time as the top of the
The elastic body 2 is in a compressed state.

Next, a method of manufacturing the electric connector will be described with reference to FIG.
This will be described with reference to FIG. First, a through-hole electrode 1a is formed on an insulating plate or sheet 1 (a). Next, copper paste 3 is filled in the hole of the through-hole electrode 1a, and after hardening, gold plating is applied to the surface (b). Next, a conductive adhesive or solder 5 is supplied onto the upper and lower through-hole electrodes 1a (c). Next, a metal foil 4a having a protrusion formed in advance in a shape corresponding to the protrusion 2a is fixed by sandwiching the insulating plate or sheet 1 with a conductive adhesive or solder 5 (d). Next, silicone rubber as the elastic body 2 is injected into the space between the metal foils 4a on both sides, and is cured after vacuum degassing (e). After gold plating 4b is applied to metal foil 4a, unnecessary portions are removed by etching to form connection pattern 4.

Next, the effects of the embodiment of the present invention will be described. Since each of the protrusions 2a is easily deformed, the protrusions 2a are easily bent even when the load for compressing the electrical connector 10 is small,
Further, since the deformation is limited to only the protrusion 2a and does not reach the insulating plate or the sheet 1 main body, even if the protrusion 2a is bent and the connection pattern 4 is deformed, the position in the plane direction does not change. In mounting the semiconductor package 30 shown in FIG.
Even if the heights of the plurality of electrode portions 30a and the plurality of electrode patterns 40a of the circuit board 40 vary, all of the top surfaces of the protrusions 2a included in one electrode surface surely contact the electrode surface. Will do.

[0017]

As described above, according to the present invention,
A through-hole electrode is formed on the insulating sheet body, and a connection pattern consisting of a metal foil strip is formed from the through-hole electrode so as to crawl on the upper and lower surfaces of the protrusions of the elastic body. As a result, an electrical connector as an anisotropic conductive sheet capable of securing electrical conduction was obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of an electrical connector according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view illustrating an operation of the electric connector according to the embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing a procedure for manufacturing the electrical connector according to the embodiment of the present invention.

FIG. 5 is a plan view of a conventional electrical connector.

FIG. 6 is a partial sectional view of FIG. 5;

FIG. 7 is a partial sectional view showing the operation of a conventional electrical connector.

FIG. 8 is a partial cross-sectional view of another conventional electrical connector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulating plate or sheet 1a Through-hole electrode 2 Elastic body 2a Projection part 3 Copper paste 4 Connection pattern 4a Metal foil 5 Conductive adhesive or solder 10 Electric connector

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toru Sekiguchi 1-23-1 Kagurechi, Fujiyoshida City, Yamanashi Prefecture Inside Citizen Electronics Co., Ltd. (72) Inventor Tsutomu Kojima 5-2-15-1 Mitake, Morioka City, Iwate Prefecture Shares Citizen Iwatenai F-term (reference) 5E023 AA04 AA16 AA18 AA22 BB01 BB18 BB22 CC02 CC23 CC26 DD26 EE19 EE34 EE36 GG17 HH06 HH08 HH17 HH18 HH28 5E024 CA18 CB01

Claims (3)

[Claims] 1. An electrical connector comprising: an insulating sheet body; and a plurality of conductive members penetrated in a thickness direction of the insulating sheet body and embedded such that both end faces are exposed on the surface of the sheet body. Protrusive elastic bodies arranged vertically and horizontally are disposed so as to face the upper and lower surfaces of the body, and a through-hole electrode is formed in the insulating sheet body in the vicinity of the protruding elastic body and joined to the through-hole electrode. An electrical connector, wherein a metal foil strip is provided up to a top surface along a surface of a projecting elastic body on upper and lower surfaces of the insulating sheet. 2. The electrical connector according to claim 1, wherein the through-hole electrode is a hole-filled through-hole, and the upper and lower electrodes are flat. 3. The electrical connector according to claim 1, wherein the metal foil strip is joined to the through-hole electrode via a conductive adhesive or solder.