JP2000323204A - Intermediate electric connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intermediate electric connector having a conductive member for improving contact stability and reducing contact resistance. SOLUTION: A conductive member 3 is composed of a conductive elastomer material, and provided with a held part 4 held on a periphery of a holding hole 2 by locking with the periphery of the holding hole 2 of a holding member 1, and an elastic protrusion 5 protruded from the held part 4 to a board thickness direction of the holding member 1. The held part 4 is provided with a projecting part projected outward a radial direction from the holding hole 2 on both surfaces of the holding member 1, and contacting parts 7 in which end surfaces of the elastic protrusion 5 are brought into elastically contact with circuit parts 11A, 12A of counterpart contacting bodies 11, 12 are formed, and a transition region defined between the elastic protrusion 5 and the held part 4 substantially has a step-shaped part 6, and a small radius part of the step-shaped part 6 is positioned within the holding hole 2 in the radial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an intermediate electrical connector.

[0002]

2. Description of the Related Art An intermediate electrical connector is used to connect corresponding circuit portions of a connecting body such as two circuit boards. The intermediate electrical connector is usually mounted on a plate-like holding member made of an insulating material such that the conductive member penetrates and protrudes in the thickness direction of the holding member. As the conductive member, for example, a material formed by mixing a conductive powder into an elastic polymer material, that is, a so-called conductive elastomer is used. As an example, as shown in FIG. 8A of the accompanying drawings, a conductive member 52 having a vertically symmetrical conical peripheral surface 52A is attached to a holding member 51 made of an insulating material by integral molding. The upper and lower flat end surfaces of the conductive member 52 form contact portions 53 and 54 that elastically contact the circuit portion of the mating connector.

The conductive members 52 as described above are provided at a plurality of predetermined positions with respect to the holding member 51.

In use, mating connectors 55 and 56 such as a circuit board are attached to predetermined positions on both sides of a holding member 51 as shown in FIG. The mating connectors 55 and 56 have circuit portions 55A and 56B, respectively. The contact portions 53 and 54 of the conductive member 52 are resiliently pressed by the circuit portions 55A and 56B, and the conductive member 52 is elastically deformed. Thus,
Circuit parts 55A, 56B of the two mating connectors 55, 56
Are electrically short-circuited via the conductive member 52.

[0005]

However, FIG.
In the intermediate electrical connector having the conventional conductive member of (A) and (B), the amount of elastic deformation at the time of using the conductive member cannot be sufficiently obtained, and therefore, there is also a problem. .
As shown in FIG. 8A, since the conductive member 52 has a gradually increasing cross-sectional area from the contact portions 53 and 54 on the end faces toward the holding member 51 and is held at the periphery of the holding hole 51A, The force that the mating connector presses against the contact portion 53 is dispersed throughout, and a portion of the conical peripheral surface 52 close to the surface layer is provided with the overhang portion 52B that covers the peripheral portion of the holding hole 51A of the holding member 51 and the above-described portion. A stress is generated between the contact portion 53 and the periphery thereof, so that a large deformation cannot be obtained.

[0006] One holding member is provided with a large number of conductive members, which simultaneously come into contact with the corresponding circuit portion of the mating connector. Between these many conductive members,
There is variation in height dimension during molding. In addition, since the mating connector and the holding member have a distortion in the plate thickness direction, the distortion is added to cause a variation in the position of the contact portion among the many conductive members. Therefore, furthermore,
When the intermediate electrical connector is subjected to an external force, the mating connector will flash in the above direction. It is required that the conductive member can sufficiently absorb the variation and can secure an elastic deformation amount that can follow the position movement due to the instantaneous movement. However, in the case of FIGS. 8A and 8B described above, a large amount of deformation cannot be obtained as described above, which is not sufficient in this respect, and causes a contact failure.

[0007] The conductive elastomer used as a material of such a conductive member has a property that the volume resistivity (resistance value per unit volume) in the compression direction is reduced by being compressed. However, as described above, since sufficient elastic deformation, that is, compression is not performed, the contact resistance value becomes high.

SUMMARY OF THE INVENTION In view of the foregoing, an object of the present invention is to provide an intermediate electrical connector having a conductive member capable of improving contact stability and reducing contact resistance.

[0009]

In the intermediate electrical connector according to the present invention, a conductive member is held at a peripheral edge of a holding hole formed through a plate-like holding member made of an electrical insulator in a thickness direction of the holding member. The corresponding circuit portions of the mating connectors disposed on both sides of the holding member are short-circuited via the conductive member.

In the intermediate connector of the present invention, in the present invention, the conductive member is made of a conductive elastomer material, and is engaged with the periphery of the holding hole and held by the periphery. An elastic projection projecting from the held portion in the thickness direction.

The above-mentioned held portion has a projecting portion projecting radially outward from the holding hole on both surfaces of the holding member, and a contact portion in which an end face of the above-mentioned elastic projection makes elastic contact with a circuit portion of a mating connection body. Is formed. The transition region between the elastic projection and the held portion substantially forms a step, and the small diameter portion of the step is located within the range of the holding hole in the radial direction.

In the present invention having such a configuration, since the step portion exists in the transition area and the small-diameter portion of the step portion is located within the range of the holding hole, the conductive member can be brought into contact with the contact portion. When receiving the pressing force from the contact body, the elastic deformation due to the pressing force occurs more in the elastic projection than in the held portion. That is, the elastic projection can be deformed without being restrained by the held portion, and thus the amount of deformation increases. Thus, the corresponding circuit portions of the two mating connectors are short-circuited via the conductive member.

In the contact state, since the amount of deformation of the conductive member is large, it is stable and its electric resistance is low.

In the present invention, the conductive member may have various shapes. For example, the cross-sectional shape in a plane including the axis can be symmetric or asymmetric with respect to the axis. Furthermore, the cross-sectional shape in the plane including the axis may be changed in the circumferential direction so as to be spiral. If it is asymmetric, the contact portion moves with the contact portion with the circuit portion of the mating connection body at the time of contact, so that a cleaning effect called wiping is obtained. In particular, when a spiral is formed, the movement of the contact portion is performed in the circumferential direction.

The shape of the peripheral surface of the elastic projection of the conductive member is as follows:
It can have a cylindrical or conical shape.

Further, the shape of the contact portion of the elastic projection may be a flat surface perpendicular to the axis, a convex or concave curved surface, or an inclined surface with respect to the axis.

In the present invention, it is sufficient that the step portion has a substantially stepped shape, and the corner portion may be provided with some roundness as a measure against fatigue, or preferably provided. Sometimes.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG.
An embodiment of the present invention will be described based on the above.

In FIG. 1A, the holding member 1 is made of an insulating material in a plate shape. The holding member 1 is formed with holding holes 2 having an inner diameter D1 penetrating in a plate thickness direction at a number of positions, and the conductive member 3 is held at the periphery of each holding hole 2 so that the holding member 1 It is mounted by integral molding with

The material of the holding member 1 is preferably a film of polyimide, polyester, polyamide or the like.

Next, the conductive member 3 is generally made of an elastic polymer material mixed with conductive powder or strips.

As the elastic polymer, silicone rubber,
Polybutadiene rubber, natural rubber, polyisoprene, styrene-butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber, ethylene-propylene copolymer rubber, urethane rubber, polyester rubber, chloroprene rubber, epichlorohydrin rubber, soft liquid epoxy rubber Are preferred.

The conductive powder or strip mixed into these elastic polymer materials may be made of gold, silver,
Nickel, copper, tin, aluminum, palladium, one or more of carbon, as powder, granular,
One or more of tree, flake, and irregular shapes. In particular, it is desirable that the material is silver and the shape is mostly flake-like. Further, it is preferable that the surface of the silver powder is treated with an organic silicon compound.

The conductive member 3 made of such a material has a held portion 4 and an elastic projection 5. The held part 4 is
It is formed so as to cover the peripheral edge of the holding hole 2 of the holding member 1 so as to be in contact with the inner peripheral edge and also in contact with the upper and lower surfaces of the holding member 1 so as to project radially outward from the inner diameter D1 of the holding hole 2. It is firmly held at the periphery of the holding hole 2. The elastic projection 5 forms a stepped portion 6 in a transition area with the held portion 4, projects in the direction of the axis 2 </ b> A of the holding hole 2 so as to form a cylindrical shape having an outer diameter D <b> 2, and forms a flat surface contact. It has a part 7. The outer diameter D2 forming the small diameter portion of the stepped portion 6 is smaller than the inner diameter D1 of the holding hole 2, and the elastic projection 5 is located in the range of the holding hole 2 in the radial direction. Note that the corners of the stepped portion 6 need only be substantially stepped, and may have some roundness R as shown in the figure.

The intermediate electrical connector of the present embodiment is used and functions as follows.

As shown in FIG. 1B, two mating connectors 11, such as a circuit board, are provided at predetermined positions on both sides of the holding member 1.
12 are arranged. The position is fixed by means not shown.

The mating connectors 11 and 12 are provided with circuit portions 11A and 12A on the opposing surfaces, respectively.
1A and 12B press the contact portion 7 of the conductive member 3.

The elastic projection 5 having a cylindrical outer peripheral surface has a stepped portion 6 in a transition region to the held portion 4, and the stepped portion 6
Since the outside diameter of the small-diameter portion (that is, the cylindrical outer peripheral surface) is smaller than the diameter of the holding hole 2 and is within the range, the elastic deformation is large in the vertical direction without being much restricted by the existence of the held portion 4. As described above, since the amount of deformation in the elastic protrusion 5 is large, the contact portion 7 of the conductive member 3 and the mating connector 11, 1
Even if the positional relationship with the second surface varies among many conductive members, it is sufficiently absorbed. Therefore, good contact under a sufficient contact pressure is ensured for all the conductive members 3. In addition, since the electrical resistance of the conductive member 3 is reduced by being largely compressed and deformed, the contact resistance is reduced.

The present invention can be variously modified with respect to FIGS. 1 (A) and 1 (B). For example, as for the outer peripheral shape of the elastic projection, the stepped portion 6 may be formed by an inclined surface as shown in FIG. 2, or the stepped portion 6 is provided only on one of the mating connectors as shown in FIG. Alternatively, the other side may have a conical shape without a stepped portion. In the latter case, the effect of the embodiment of FIG. 1 is obtained on the side where the step is formed. Further, as shown in FIG. 4, the outer peripheral surface of the elastic projection 5 may be formed in a conical shape. Also in this case, a stepped portion 6 having a substantially stepped shape must be formed in the transition region between the elastic projection 5 and the held portion 4.

Further, in the above embodiment, the cross-sectional shape on the plane including the axis 2A is symmetric with respect to the axis 2A, but is not limited thereto and may be asymmetric. For example, as shown in FIG. 5, the right half of the axis 2A may have the same shape as that of FIG. 1, and the left half may have the conventional shape shown in FIG. In this case, since a large elastic deformation occurs in the right half, the contact portion 7 comes into sliding contact with the circuit portion of the mating connection body in a lateral direction, so that a so-called wiping effect is brought about.

The asymmetric form is not limited to the above-described form in which the cross-sectional shape including the axis is asymmetric with respect to the axis, but may be asymmetric about the axis, that is, in the circumferential direction. For example, as shown in FIG. 6, this is an example in which the thickness of the held portion 4 changes spirally. Also in this case, the elastic projection 5 is elastically deformed well. At that time, the deformation causes a twist around the axis 2A, and this twist brings a wiping effect to the mating connector.

Further, the form of the contact portion, which is the end face of the elastic projection, can be variously modified. FIG. 7 (A)-
(D) shows an example. In FIG. 7A, the wiping effect can be obtained because the contact portion 7 forms an asymmetric inclined surface. FIG.
If the inclined surface is formed symmetrically and the tip is formed at the center as in (B), the wiping effect cannot be obtained, but the area of the contact portion is reduced when the mating connection body is easily corroded. As a result, the Hertz stress can be increased, and the contact stability can be obtained. This effect can also be obtained by forming a convex curved surface as shown in FIG. Further, if a concave curved surface is formed in the contact portion as shown in FIG. 7D, the effect of adsorbing to the mating connector at the time of contact is obtained, and the connection is made more reliable. When the contact with the mating connector is made with a solder ball or the like, the concave curved surface may be a curved surface having a depth suitable for the contact (for example, a curved surface indicated by a two-dot chain line). Furthermore, although not particularly shown, if the contact surface is made to be a fine uneven surface, a random wiping effect can be obtained at any part of the contact surface.

[0033]

According to the present invention, as described above, the conductive member is made of a conductive elastomer material, and is engaged with the periphery of the holding hole formed in the holding member to hold the portion to be held by the periphery. An elastic projection projecting beyond the held portion in the thickness direction of the support member, wherein the held portion projects radially outward from the holding hole on both surfaces of the holding member. With
An end surface of the elastic projection forms a contact portion that makes elastic contact with a circuit portion of the mating connection body, and a transition region between the elastic projection and the held portion substantially forms a step-like portion. Since the small diameter portion is located within the range of the holding hole in the radial direction, the elastic protrusion is not restricted by the existence of the held portion at the time of contact pressure with the mating connector, It can be elastically deformed greatly, and the amount of deformation can be sufficiently secured.Also, even if there are variations in the relative positions of the contact portions of the many conductive members with the mating connector, even if the mating connector instantaneously flashes, it is sufficient. This can be absorbed, and connection stability can be ensured. Moreover, due to the sufficient amount of compressive deformation, the contact resistance of the conductive member is reduced, and a good electrical connection is made.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conductive member according to an embodiment of the present invention in a plane including an axis, in which FIG. 1A shows a state before deformation and FIG. 1B shows a state after deformation.

FIG. 2 is a sectional view showing a modification of the conductive member of FIG.

FIG. 3 is a sectional view showing another modification of the conductive member of FIG.

FIG. 4 is a sectional view showing still another modification of the conductive member of FIG.

FIG. 5 is a sectional view showing still another modification of the conductive member of FIG.

FIG. 6 is a perspective view showing still another modification of the conductive member of FIG.

FIG. 7 is a cross-sectional view showing a modification of the contact portion;
FIG. 7A shows an asymmetrical inclination, FIG. 7B shows a symmetrical inclination, and FIG.
7C shows an example of a convex curve, and FIG. 7D shows an example of a concave curve.

FIG. 8 is a cross-sectional view taken along a plane including an axis of a conventional conductive member.
FIG. 8A shows the state before deformation, and FIG. 8B shows the state after deformation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holding member 2 Holding hole 2A Axis 3 Conductive member 4 Held part 5 Elastic protrusion 6 Stepped part 7 Contact part 11, 12 Mating connection body

Claims (9)

[Claims] 1. A conductive member is held at a peripheral edge of a holding hole formed through a plate-shaped holding member made of an electrical insulator in a thickness direction thereof, and mating connections provided on both sides of the holding member. In the intermediate electrical connector for short-circuiting each corresponding circuit part of the body via the conductive member, the conductive member is made of a conductive elastomer material, and is held by the periphery of the holding hole to be held by the periphery. And an elastic projection protruding from the held portion in the plate thickness direction of the support member, wherein the held portion projects radially outward from the holding hole on both surfaces of the holding member. Part, the end face of the elastic protrusion forms a contact portion that makes elastic contact with the circuit portion of the mating connector, the transition area between the elastic protrusion and the held portion substantially forms a step-like portion, It is characterized in that the small diameter portion of the step portion is located within the range of the holding hole in the radial direction. Intermediate electrical connector. 2. The intermediate electrical connector according to claim 1, wherein the conductive member has a symmetrical sectional shape in a plane including the axis. 3. The intermediate electrical connector according to claim 1, wherein the conductive member has an asymmetrical cross-sectional shape in a plane including the axis. 4. The intermediate electrical connector according to claim 3, wherein a cross-sectional shape of the conductive member in a plane including the axis changes in a circumferential direction. 5. The intermediate electrical connector according to claim 1, wherein the conductive member has a cylindrical shape on the peripheral surface of the elastic projection. 6. The intermediate electrical connector according to claim 1, wherein the conductive member has a conical peripheral surface of the elastic projection. 7. The intermediate electrical connector according to claim 2, wherein the contact portion of the elastic member has a flat surface perpendicular to the axis. 8. The intermediate electrical connector according to claim 2, wherein the contact portion of the elastic protrusion of the conductive member has a convex or concave curved surface. 9. The intermediate electrical connector according to claim 3, wherein the conductive member has a contact portion of the elastic projection formed with an inclined surface with respect to the axis.