JPH04269477A - Electric connecting member - Google Patents

Abstract

PURPOSE:To moderate the stress concentration to each conductive member in the connection of electric circuit parts and eliminate an increase in electric resistance and a continuity failure by providing conductive members on the surface of a holding body at a high density in a constitution provided with the holding body consisting of an insulating material and a plurality of conductive members buried therein in the state mutually insulated. CONSTITUTION:Conductive members 3, 3... are staggered on the surface of a holding body 2. According to this disposition, the conductive members 3, 3... can be disposed at a high density as much as possible under the condition in which the sizes of the conductive members 3, 3... and the spaces between adjacent conductive members 3, 3 (dimension P in the drawing) are identical. Namely, the number of the conductive members 3, 3... making contact with electrodes 40, 50 of a determined size which are connecting targets is increased, and the degree of the stress concentration in the respective conductive members 3, 3... is moderated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connection member used to establish an electrical connection between electrical circuit components.

0002

2. Description of the Related Art Known methods for establishing an electrical connection between electrical circuit components include a wire bonding method, an automatic bonding method using a tape carrier system disclosed in Japanese Patent Application Laid-Open No. 59-139636, and so on. ,TAB
(Tape Automated Bonding) method. However, these methods have the disadvantage that they cannot cope with an increase in the number of connection points, and also cannot obtain the connection status between many connection points at once, requiring a large amount of man-hours for connection work. There was a problem that there was a limit to cost reduction.

[0003] In order to solve these difficulties, for example, Japanese Patent Laid-Open No. 63-222437 and Japanese Patent Laid-open No. 63-222437
-228726, and Japanese Patent Application Publication No. 63-24683
In Publication No. 5, etc., electrical circuit components are electrically connected to each other using an electrical connection member formed by embedding a plurality of conductive members densely in a holder made of an insulating material while being insulated from each other. It is proposed that.

FIG. 3 is a longitudinal sectional view of this electrical connection member.
FIG. 4 is a plan view as well. As shown in these figures, the electrical connection member 1 has a short round rod-shaped conductive material made of a highly conductive metal inserted into each of a number of holes formed by penetrating the holder 2 made of an insulating material from the front and back sides. burying members 3, 3...;
Both ends of each conductive member 3 are exposed in a convex shape on both surfaces of the holder 2, respectively. As shown in FIG. 4, the conductive members 3, 3, . . . buried in this manner are arranged in rows and columns, with a predetermined interval between them in plan view.

FIG. 5 shows how electrical circuit components are connected by this electrical connection member 1. As shown in FIG. In the figure, reference numerals 4 and 5 indicate electrical circuit components to be connected, and the electrical connection member 1 connects the electrodes 40 and 50, which are the connection ends of the electrical circuit components 4 and 5, to both sides of the holder 2. This is done by aligning the conductive members 3 facing each other in a plan view, press-contacting the exposed ends of the conductive member 3 on each surface by appropriate means, and metal-bonding the exposed ends to the electrodes 40, 50. Note that, as shown by the two-dot chain line in FIG. 4, the electrodes 40, 50 are usually
These electrodes 40 are sufficiently large compared to the conductive member 3.
, 50 are made via a plurality of conductive members 3, 3, . . . .

[0006]

By the way, in the electrical connection member 1 as described above, the conductive member may be damaged due to the action of force other than in the pressure contact direction when the electrodes 40 and 50 are pressed together, and the action of thermal stress after the connection. 3, 3... and the joint portions between these and the electrodes 40, 50.
Furthermore, if cracks occur in the holder 1 and severe stress concentration occurs, the conductive members 3, 3, . . . or the holder 1 may break, resulting in increased electrical resistance and poor continuity.

[0007] This problem can be solved by connecting the electrodes 40, 50 through as many conductive members 3, 3, . . . High density of the conductive members 3, 3... on the surface of the holder 2, that is, the conductive members 3,
It is strongly desired to increase the number of 3... buried as much as possible. This higher density is achieved by making each conductive member 3 smaller and by reducing the interval between adjacent conductive members 3 (dimension P in FIG. 4).

However, there is a limit to the miniaturization of the conductive member 3, and the reduction of the dimension P cannot be achieved by reducing the size of the conductive member 3 adjacent to each other.
, 3, and in practice, the lower limit of the diameter of the conductive member 3 is about 10 μm.
The lower limit of P dimension when using this conductive member 3 is 20 μm
That's about it. For these reasons, there is a limit to increasing the density of the conductive members 3, 3, .

The present invention has been made in view of the above circumstances, and it is possible to further increase the density of conductive members while maintaining the lower limit of the distance between the conductive members, and to reduce stress concentration on the conductive members. It is an object of the present invention to provide an electrical connection member that can effectively eliminate the increase in electrical resistance and the occurrence of poor conduction.

0010

[Means for Solving the Problems] An electrical connection member according to the present invention includes a holder made of an insulating material and a plurality of conductive members embedded in the holder in an insulated state, and the electrical connection member of the present invention In an electrical connection member that has both ends exposed on both sides of the holding body and that establishes a connection between connection parts of electrical circuit components that contact both exposed ends of each conductive member, the conductive member is connected to the holding body. It is characterized by being arranged in a staggered manner on the surface of the body.

[0011]

[Operation] In the present invention, the conductive members are arranged in a staggered manner on the surface of the holder, so that the conductive members are arranged in a higher density than when they are arranged in rows and columns, thereby making it possible to arrange the conductive members on the surface of the holder in a staggered manner. The number of electrically conductive members connected to the electrodes is increased, the degree of stress concentration in each electrically conductive member is alleviated, and the accompanying problems of increased electrical resistance and poor conduction are solved.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to drawings showing embodiments thereof. FIG. 1 is a schematic diagram showing an example of the manufacturing process of an electrical connection member according to the present invention.

First, as shown in FIG. 1(a), a metal plate (for example, a copper plate) 10 serving as a base is prepared, and a negative type photosensitive polyimide resin 11 is coated on this metal plate 10 with an adhesion aid using a spin coater. Apply. As will be described later, this polyimide resin 11 constitutes the holder 2 in the electrical connection member 1, and the coating thickness of the polyimide resin 11 is determined by taking into consideration reductions due to solvent scattering, shrinkage in the subsequent curing process, etc. The thickness is made thicker than the thickness of the holder 2 to be obtained.

Next, the surface of the coating layer of polyimide resin 11 is irradiated with light (exposure) through a photomask (not shown) in which a predetermined pattern is formed, and further development is performed. As a result, the unexposed portions of the coating layer of polyimide resin 11 are removed, and as shown in FIG. 1(b), a large number of through holes 12, 12, . . . each having a circular cross section are formed.

[0015] After that, the temperature was raised and the polyimide resin 11
The coating layer is hardened by imidization, and then the metal plate 10 located below the through holes 12, 12... is etched by etching from the surface side of the polyimide resin 11, as shown in FIG. 1(c). Form recesses 13, 13, etc. as shown in FIG. Note that this etching process is performed until the diameter of the recesses 13, 13... becomes slightly larger than the diameter of the through holes 12, 12....

Next, by electroplating using the metal plate 10 as a common electrode, the through holes 12, 12... and the recesses 13,
13... is filled with gold 14. This filling is performed by filling through holes on the surface of the polyimide resin 11, as shown in FIG. 1(d).
Gold 14 is heaped up on the open ends of the holes 12, 12, . . . to a thickness corresponding to the recesses 13, 13, . Note that this electroplating is not limited to gold (Au) 14, and may be performed using a metal or alloy having excellent conductivity, such as a metal such as Ag, Cu, Be, Mo, or Ni, or an alloy thereof.

Finally, the metal plate 10 used as a base is removed by metal etching. As a result, as shown in FIG. 1(e), a large number of conductive members 3, 3, etc. made of gold 14, which has excellent conductivity, are embedded in a holding body 2 made of polyimide resin 11, which is an insulating material, insulated from each other. , an electrical connection member 1 is constructed in which both ends of these are exposed on both sides of the holder 2, respectively.

The electrical connection member 1 according to the present invention thus obtained has the same configuration as the conventional one shown in FIG. 3 in cross-sectional view, and the electrical connection member 1 according to the present invention The connection of electric circuit components by the connection member 1 is also performed in exactly the same manner as in the prior art, as shown in FIG.

The characteristics of the electrical connection member 1 according to the present invention are as follows:
As is clear from the plan view shown in FIG. 2, the manner in which the conductive members 3, 3... are arranged on the surface of the holder 2 is different from the conventional one, and the conductive members 3, 3... are arranged in a staggered manner. It is in. Staggered arrangement is often used when arranging groups of heat transfer tubes in boilers, various heat exchangers, boilers, etc. As is clear from the figure, three adjacent conductive members 3, 3, 3 are placed in one
These equilateral triangles are placed on the vertices of two equilateral triangles, and the equilateral triangles are arranged vertically and horizontally while sequentially changing their orientation up and down.

FIG. 2 and FIG. 4, which shows the arrangement of the conventional conductive members 3, 3..., are obtained by cutting out portions of approximately the same area of the holder 2, and measuring the diameter dimensions of the conductive members 3, 3... conductive member 3,
3... are shown with substantially equal intervals (P dimensions). When comparing both figures, in FIG. 4, the number of conductive members 3, 3, etc. that appear in the figure is 20, while in FIG. , there are 4 incompletely included conductive members 3, a total of 27 conductive members 3,
3... appears in the figure. From this, in the electrical connection member 1 according to the present invention, when the conductive members 3, 3 have the same diameter dimension and the above-mentioned P dimension, the conductive members 3, 3... have a significantly higher density than the conventional one. It can be seen that it is possible to

The diameter dimension of the conductive members 3, 3 is determined by the precision of forming the pattern on the photomask used for exposing the polyimide resin 11 in the manufacturing process described above, and the dimension P is determined by the diameter of the conductive members 3, 3 These conditions are determined from the viewpoint of maintaining the insulation state between the conductive members 3, 3, and are the same regardless of the manner in which the conductive members 3, 3, . . . Therefore, in the electrical connection member 1 according to the present invention, it is possible to arrange the conductive members 3, 3 at a much higher density than in the conventional one.

Furthermore, in FIG. 2, electrodes 4 to be connected are shown.
0 and 50 are shown with the same dimensions as in FIG. Comparing the two figures, it is found that in FIG. 4, the electrodes 40, 50 can only contact a maximum of six conductive members 3, 3, etc., including incomplete ones, whereas in FIG. conductive member 3,
It can be seen that almost perfect contact has occurred in 3.... As a result, the degree of stress concentration in each of the conductive members 3, 3... is reduced, and there is less risk of cracks or breaks occurring in the conductive member 3 and the holder 2 when the electrodes 40, 50 are pressed together. The accompanying problems of increased electrical resistance and poor conduction are effectively resolved. In addition, even when the connection is made normally, in the electrical connection member 1 according to the present invention, electricity is passed through more conductive members 3, 3, etc. than in the conventional one, so the electricity at the connection part is The resistance is reduced and a good conduction state is obtained.

[0023]

Effects of the Invention As detailed above, in the electrical connection member according to the present invention, since the conductive members are arranged in a staggered manner on the surface of the holder, the number of conductive members arranged per unit area is lower than that of the conventional one. When electrical circuit components are pressure-welded, the degree of stress concentration in each conductive member is alleviated, and the increase in electrical resistance and poor continuity caused by cracks or breaks in the conductive member and the holder are reduced. The present invention has excellent effects, such as effectively eliminating the possibility of the occurrence of.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a manufacturing process of an electrical connection member according to the present invention.

FIG. 2 is a plan view of an electrical connection member according to the present invention.

FIG. 3 is a longitudinal cross-sectional view of a conventional electrical connection member.

FIG. 4 is a plan view of a conventional electrical connection member.

FIG. 5 is a schematic diagram showing how electrical circuit components are connected by the electrical connection member according to the present invention and the conventional electrical connection member.

[Explanation of symbols]

1 Electrical connection member 2 Holding body 3 Conductive member 4 Electric circuit parts 5 Electric circuit parts 40 Electrode 50 electrode

Claims (1)

[Claims] 1. A holding body made of an insulating material, and a plurality of conductive members embedded in the holding body insulated from each other, with both ends of these conductive members exposed on both sides of the holding body, In the electrical connection member for establishing a connection between connection parts of electrical circuit components that contact both exposed ends of each conductive member, the conductive members are arranged in a staggered manner on the surface of the holder. electrical connection member.