JPH0125489Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a press-fitting elastic contact that is press-fitted into a through-hole of a substrate and makes electrical contact with a conductive portion on the inner peripheral surface of the through-hole.

[Prior Art] A press-fitting elastic contact is used that is press-fitted into a through-hole of a substrate, comes into elastic contact with a conductive portion on the inner circumferential surface of the through-hole, and is electrically connected to the conductive portion.

FIGS. 6A and 6A to 9A and 9B are diagrams respectively showing the shape of this type of press-fitting elastic contact that has been proposed in the past and the state of press-fitting each into a through hole. The press-fitting elastic contact shown in FIG. 6A has a substantially rectangular cross section, and the diagonal of this rectangle is set slightly longer than the inner diameter of the through hole 12 into which the press-fitting elastic contact 11 is press-fitted. A rectangular parallelepiped-shaped flange 13 is provided on the upper end side of the press-fitting elastic contact 11 , and this flange 13 is designed to close the through-hole 12 at the entrance side of the through-hole 12 when the press-fitting elastic contact 11 is press-fitted into the through-hole 12 . It is disposed so as to project outward, and is used to position the press-fitting elastic contact 11 during press-fitting.

The press-fitting elastic contact 11 has a through hole 12
In the state in which the press-fitted elastic contact 1
1 is elastically fixed to the through hole 12. This deformation of the through hole 12 electrically connects the conductive portion on the inner peripheral surface of the through hole 12 and the press-fitting elastic contact 11 . The method using this press-fitting elastic contact 11 is called a solid type press-fit method because the press-fitting elastic contact itself has no deformability.

In the case shown in FIGS. 7A and 7B, notches 15 are formed in the longitudinal direction in a press-fit elastic contact 11 having a substantially rectangular cross section, and support pieces 16-1 and 16-2 are provided.
At this notch 15 part, the press-fitting elastic contact 11
The supporting pieces 16-1 and 16-2 are offset by 180 degrees in opposite directions along the surface of the notch 15. When the press-fitting elastic contact 11 is inserted into the through hole 12, the branch pieces 16-1 and 16-2 are elastically contracted according to the inner diameter of the through hole 12, and the branch pieces 16-1 and 16-2 are compressed elastically according to the inner diameter of the through hole 12. The mutually opposing apex portions elastically press against the inner circumferential surface of the through hole 12 to attach the press-fitting elastic contact.

In the case shown in FIGS. 8A and 8B, a notch 15 is provided in the press-fitting elastic contact 11 to provide support pieces 17-1 and 1.
7-2, and extend the support piece 1 at right angles to the surface of the notch 15.
7-1 and 17-2 are offset from each other by 180 degrees in opposite directions. When the press-fitting elastic contact 11 is press-fitted into the through-hole 12, the branches 17-1 and 17-2 are elastically biased so that the press-fitting elastic contact 11 is located inside the through-hole 12, and the branches 17-1 and 17-2 are biased toward each other. 17-1 and 17-2 are fixedly held within the through-hole 12 in a state in which they are in pressure contact with the inner peripheral surface of the through-hole 12.

In the one shown in FIGS. 9A and 9B, the press-fitting elastic contact 11 is provided with a wide-diameter annular portion 21, and a notch 22 is formed in the annular portion 21 in the longitudinal direction.
This cut 22 gives the annular portion 21 a shape that allows it to be elastically deflected in a direction perpendicular to the axis. When the press-fitting elastic contact 11 is press-fitted into the through-hole 12, the annular portion 21 is elastically biased in the axial direction.
The outer circumferential surface of the annular portion 21 elastically contacts the inner circumferential surface of the through hole 12, so that the press-fitting elastic contact 11 is fixedly held within the through hole 12.

The method shown in FIGS. 7 to 9 is one in which the press-fitting elastic contact 11 itself has deformability, and is called a compliant press-fit method.

"Problems to be solved by invention" In the solid type press fit method described above, the through hole 12 is deformed, that is, the through hole 12
The press-fit elastic contact 11 and the through hole 12 are connected by deforming the substrate on which the press-fitting elastic contact 11 is formed. Therefore, the deformation strain applied to the substrate changes locally due to variations in the inner diameter of the through holes 12, which may cause the substrate to warp or break. For this reason, the press-fitting elastic contact 11 may not be completely attached, which reduces the reliability of the connection.

In addition, the compliant press-fit method has disadvantages in that the press-fitting elastic contact 11 itself undergoes complicated machining, which reduces the strength of the cross section and makes the whole brittle due to hardening due to machining.

This idea solves the problems with the conventional solid-type press-fit system or compliant-type press-fit system, and maintains elasticity without performing complicated processing on the press-fitting part of the contact into the through-hole itself. This is what made it possible. This invention makes it possible to provide an elastic contact for press-fitting that can be press-fitted into small-diameter through-holes under optimal installation conditions by minimizing the loss of cross-sectional strength and work hardening of the contact. .

"Structure of the Invention" This invention is applied to a press-fitting elastic contact that is press-fitted into a through-hole formed in a substrate and makes electrical elastic contact with the inner peripheral surface of the through-hole.

In this invention, the portion of this type of press-fitting elastic contact located within the through hole is composed of a plurality of wide diameter portions and a small diameter portion connecting these wide diameter portions in the axial direction. The wide diameter portion has a shape in which the outer diameter of the cross section in the first direction perpendicular to the axis is slightly smaller than the inner diameter of the through hole. The small diameter portion that connects the plurality of wide diameter portions is shaped so that the outer diameter of the cross section in the first direction is smaller than the outer diameter of the wide diameter portion.

Between mutually adjacent wide diameter parts, the small diameter part that connects these wide diameter parts is located at one end side in the axial direction, and the end face of the wide diameter part located on one end side in the axial direction is connected to this end face and the one end side in the first direction. connected at. On the other hand, the small diameter portion is connected to the end surface of the other large diameter portion located on the other end side in the axial direction at the other end side in the first direction.

In this way, the large diameter part is connected to the small diameter part in the axial direction, so when inserted into the through hole, press them close together against the protruding parts from both ends of the through hole. The small diameter portion is displaced in the first direction, and this displacement causes the circumferential surface of the large diameter portion in the first direction to be pressed against the inner circumferential surface of the through hole. In this way, the press-fitting elastic contact of this invention is easy to process due to its structure.
In addition, it is easily elastically deformed during installation and is stably installed within the through hole.

``Example'' Hereinafter, the press-fitting elastic contact of this invention will be described in detail based on an example using the drawings.

The structure of the press-fit elastic contact of this invention is shown in perspective in FIG.
The press-fitting elastic contact 11 is made of a conductive material and has a rectangular cross section. Elastic contact for press fitting 1
1, the outer diameter is narrowed on the end side to form tapered portions 14-1 and 14-2. The flange 1 is perpendicular to the mutually opposing outer circumferential surfaces of the press-fitting elastic contacts 11 on the central side of the tapered part 14-1.
3 is provided protrudingly. The example is this tsuba 13.
The portion between the tapered portion 14-2 and the tapered portion 14-2 is a portion to be inserted into a through hole formed in the substrate.

In this invention, the part inserted into the through hole has a plurality of wide diameter parts arranged in the axial direction and in a first direction perpendicular to the axis, and these wide diameter parts are arranged by interconnecting them. It consists of a small diameter part and a small diameter part. In the first embodiment, the first direction is the direction indicated by the arrow X in FIG. A first direction perpendicular to this first direction.
In the second direction indicated by arrow Y in the figure, the press-fitting elastic contacts 11 are formed to have opposing outer peripheral surfaces that are parallel to each other.

In the first direction, the press-fitting elastic contact 1
1 is a wide diameter part 15-1, 15-2...1 whose outer diameter in the first direction is slightly smaller than the inner diameter of the through hole.
5-6, and a small diameter portion 16 connecting these wide diameter portions.
-1 to 16-5. The outer diameters of the cross sections in the first direction of these small diameter portions 16-1 to 16-5 are smaller than the outer diameters of the cross sections in the first direction of the wide diameter portions 15-1 to 15-6. be done.

Between mutually adjacent wide diameter parts, the small diameter part that connects these wide diameter parts is located at one end side in the axial direction, and the end face of the wide diameter part located on one end side in the axial direction is connected to this end face and the one end side in the first direction. connected at.

That is, in the first embodiment, for example, the wide diameter portion 15-
The small diameter portion 16-1 connecting between 1 and 15-2 is
Wide diameter portion 15- located on one end side in the axial direction, Z side
The first end surface is connected to this end surface on one end side in the first direction, that is, on the X side.

Further, the end face of the other wide diameter portion located on the other end side in the axial direction is connected to this end face on the other end side in the first direction.

That is, on the end surface of the other large diameter portion 15-2 located on the other end side in the axial direction, Z' side, the small diameter portion 16-2
1 is connected to the end surface on the other end side, that is, on the X' side in the first direction.

Similarly, the small diameter portion 16-2 is arranged between the wide diameter portions 15-2 and 15-3 to connect them, but the end surface of the wide diameter portion 15-2 is on the X' side in the first direction. and is connected on the X side opposite to the end surface of the wide diameter portion 15-3 in the first direction. The small diameter portion 16-3 is connected to the end surface of the wide diameter portion 15-3 on the X side in the first direction, and to the end surface of the wide diameter portion 15-4 on the X' side in the first direction.

Further, the small diameter portion 16-4 is connected to the end surface of the wide diameter portion 15-4 on the X' side in the first direction, and to the end surface of the wide diameter portion 15-5 on the X side in the first direction.
Furthermore, the small diameter portion 16-5 is connected to the end surface of the wide diameter portion 15-5 on the X side in the first direction, and is connected to the end surface of the wide diameter portion 15-6 in the first direction.
Connected on the X′ side.

FIG. 2 shows the first embodiment inserted into the through hole 21 of the substrate 20, and the outer diameter D of the cross section of the wide diameter portion in the first direction is slightly smaller than the inner diameter d of the through hole. Since it is set, it can be inserted smoothly into the through hole 21.

The second embodiment of this invention is shown in FIG. It is something.

That is, the small diameter portion 16-1 is connected to the end surface of the wide diameter portion 15-1 on the X side in the first direction, and the wide diameter portion 15
-2 is connected on the X' side in the first direction. On the other hand, the small diameter section 16-2 is the wide diameter section 1.
It is connected to the end surface of 5-2 on the X side in the first direction, and connected to the end surface of the wide diameter portion 15-3 on the X' side in the first direction.

In the same way, each small diameter part is connected to the end face of the wide diameter part on the Z side in the axial direction and on the X side in the first direction, and on the Z' side in the axial direction, the small diameter part is connected to the end face of the wide diameter part in the first direction. of
They are connected on the X′ side.

"Effect of the invention" In the first embodiment, the through hole 2 is inserted into the through hole 21 from the state shown in FIG.
An external force F is applied to the parts protruding from both ends of 1 so as to bring them closer to each other. In such a case, an internal compressive force P is applied from both sides in the axial direction of the press-fit elastic contact 11, and a compressive force P supported from both sides is applied to the small diameter portion on the opposite side from the axial center, and the eccentricity and P are The moment of the product of This moment elastically deflects the small diameter portions 16-1 to 16-5 in the direction of connection with the wide diameter portions 15-1 to 15-6.

Due to this elastic deflection, the large diameter portion is elastically pressed against the inner circumferential surface of the through hole 21 in the direction in which it is connected to the small diameter portion. The large diameter portion that is not connected to the small diameter portion is deviated away from the inner circumferential surface of the through hole 21 .

In this way, one side surface of each wide diameter portion 15-1 to 15-6 in the first direction comes into elastic contact with the inner circumferential surface of the through hole 21, and is mounted in a stable state in the axial direction. be done.

In the second embodiment as well, an external force is applied to the protruding portions from the through hole 21 in a direction in which they approach each other from the inserted state into the through hole 21 shown in FIG. In this second embodiment as well, the small diameter portions are deflected by the application of external force, and each small diameter portion 1
Wide diameter portion 15-1 connected to 6-1 to 16-4
15-5 is elastically pressed against the inner circumferential surface of the through hole 21 on the connection end side in the first direction. The wide diameter portion on the end side that is not connected to the small diameter portion in the first direction is slightly raised above the inner circumferential surface of the through hole 21 .

In this second embodiment, the press-fit elastic contact 11 is stably installed in the through hole 21 in the axial direction with the corner of the wide diameter portion biting into the through hole 21.

In any of the embodiments, no external force is applied when inserting the press-fitting elastic contact 11 into the through hole 21, and there is no risk of breakage. In addition, when an external force is applied during installation, the wide diameter part of the press-fitting elastic contact 11 stably and reliably elastically contacts the inner circumferential surface of the through hole 21 with one entire surface or corner part biting into the press-fitting elastic contact 11. elastic contact 11
A stable electrical connection between the inner peripheral surface of the through hole 21 and the inner peripheral surface of the through hole 21 is established.

In any of the embodiments, in order to release the press-fitting elastic contact 11 from the through-hole 21, the attached press-fitting elastic contact 1
When tension is applied in the axial direction of 1, the elastic pressure contact between the wide diameter portion and the inner circumferential surface of the through hole 21 is released.
The press-fitting elastic contact 11 can be easily removed from the through hole 21.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of the first embodiment of the press-fitting elastic contact of this invention, and FIGS.
The figures are cross-sectional principle views showing the first embodiment of the press-fitting elastic contact of this invention in a state of insertion into a through-hole and the mounting and fixing state, and FIGS. 4 and 5 respectively show the press-fitting elastic contact of this invention. A cross-sectional principle diagram showing a state of insertion into a through hole and a state of attachment and fixation of the second embodiment, and FIGS. 6A and B to FIGS. 9A and B are perspective views showing the shape of a conventionally proposed elastic contact for press-fitting. FIG. 4 is a cross-sectional principle diagram showing a state of attachment to a through hole. 11: Elastic contact for press-fitting, 13: Tsuba, 15
-1, 15-2...: Wide diameter part, 16-1, 16-2
...: Small diameter part, 20: Substrate, 21: Through hole.

Claims (1)

[Scope of utility model registration request] In a press-fitting elastic contact that is press-fitted into a through-hole formed in a substrate and makes electrically elastic contact with the inner circumferential surface of the through-hole, a portion of the press-fitting elastic contact that is located inside the through-hole is aligned with the axis. A plurality of wide diameter portions having an outer diameter of a cross section in a perpendicular first direction slightly smaller than an inner diameter of the through hole are connected to each other, and the outer diameter of a cross section in the first direction is connected to a plurality of wide diameter portions. Small diameter portions smaller than the outer diameter of the wide diameter portion are arranged in the axial direction, and between adjacent wide diameter portions, the small diameter portion connecting these wide diameter portions is arranged along the axis. An end surface of one wide diameter portion located on one end side in the axial direction is connected to this end surface on one end side in the first direction, and an end surface of the other wide diameter portion located on the other end side in the axial direction. The elastic contact for press-fitting is characterized in that this end face is connected to the other end side in the first direction.