JPH04366569A - Sleeve contact - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve contact in which an inner contact for holding the leads is housed inside a sleeve-like outer cylinder into which the leads of an IC are inserted.

0002

2. Description of the Related Art Conventionally, this type of sleeve contact consists of a sleeve-shaped outer cylinder having a closed end and an open end, and an inner contact housed inside the outer cylinder, and the inner contact is tightly fitted onto the inner circumferential wall surface of the outer cylinder. a plurality of lead-clamping elastic contact pieces extending from the ring part; and a contact part that captures the lead inserted into the outer cylinder at the free end of the lead-clamping elastic contact pieces. is forming.

0003

[Problems to be Solved by the Invention] However, the lead-clamping elastic contact piece of the inner contact is housed in a sleeve-shaped outer cylinder in a cantilevered state, and the lead is captured by the free end of the cantilevered contact piece. Because it is a structure that makes contact with
When the sleeve contact is downsized and the inner contact is miniaturized, the cantilever spring structure cannot secure enough elastic pressure to hold the insertion lead, and there is a limit to the diameter reduction of the sleeve-shaped outer cylinder, that is, the downsizing of the sleeve contact. have.

Furthermore, since the cantilever spring forming the lead clamping contact piece is simply extended in the axial direction of the outer cylinder, the length in the axial direction of the outer cylinder becomes longer, resulting in an increase in the length of the inner contact. Therefore, if the length of this inner contact is reduced, a sufficient spring length cannot be obtained, resulting in a problem of lowering the reliability of contact with the lead.

Furthermore, in the conventional cantilever spring structure in which the contact piece is extended in the axial direction of the outer cylinder, the oxide film on the contact surface cannot be sufficiently removed, resulting in a problem that the reliability of the contact is further reduced.

[0006]

[Means for Solving the Problems] The present invention provides a sleeve contact that enables the sleeve contact to be made smaller, particularly to have a smaller diameter, while ensuring sufficient contact pressure with the lead and achieving highly reliable contact. As a means for this purpose, the inner contact is provided with a closed end side ring part and an open end side ring part, and a plurality of elastic contact pieces for lead clamping are extended between the two ring parts, and both ends of the elastic contact pieces are extended. It is configured to be connected to both of the ring portions and brought into contact with the lead.

The present invention also has a structure in which the center portion of the elastic contact piece for holding the lead is bent in the circumferential direction of the outer cylinder, twisted with respect to the axis of the outer cylinder, and bent into the inner regions of both ring parts. That is.

Further, the present invention provides a contact piece portion connected to the closed end side ring portion of the lead clamping elastic contact piece and a contact piece portion connected to the open end side ring portion, respectively, from each ring portion to the axis of the sleeve-like outer cylinder. The connecting portion of both contact pieces extending at an angle is bent into the inner area of both the ring portions to form a pressurized contact portion that pinches the lead. It is something.

[0009]

[Operation] According to the present invention, the elastic contact piece for holding the lead is extended between the closed end side ring part and the open end side ring part, and both ends of the same contact piece are connected to both ring parts, so that the lead holding structure is held at both ends. Even if the inner contact is miniaturized, the contact pressure by the elastic contact piece can be ensured by providing contact with the inner contact, and by forming a pressurized contact part that holds the lead in the center of this double-sided elastic contact piece, proper contact can be achieved. fulfilled.

Furthermore, by twisting the elastic contact piece which is curved or inclined in the circumferential direction, the edge of the pressure contact can be brought into contact with the lead surface to remove the oxide film and increase the contact pressure, resulting in high reliability. contact can be made. As a result of the above, a sleeve contact is provided which achieves reduction in the diameter of the inner contact and miniaturization of the sleeve contact, and at the same time ensures sufficient contact pressure with the insertion lead to achieve highly reliable contact.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to FIGS. 1 to 6. As shown in FIG. 2, the sleeve contact is constructed by housing an inner contact 2 inside a sleeve-shaped outer cylinder 1. This sleeve-shaped outer cylinder 1 has an open end 1a and a closed end 1b, and the inner circumferential wall surface of the open end 1a is expanded outward of the sleeve-shaped outer cylinder 1 to form a tapered part 1c, into which the inner contact 2 is inserted. Make it easier. Further, a flange 1d is formed on the open end 1a side to set the depth of press-fitting into the contact implantation hole of the connector base, and a press-fitting claw 1e that is press-fitted into the inner wall of the hole is formed on the outer peripheral surface of the flange 1d.

On the other hand, FIG. 5 shows a developed view of the inner contact 2, that is, a punched form, in which the inner contact 2 is punched out in parallel so that the length of the open end side ring part 3 is longer than the length of the closed end side ring part 4. , both ring parts 3 and 4 at the same time
Elastic contact pieces 5 for holding the lead, which are elongated and have the same width, are arranged at regular intervals, and both ends 5a and 5b are connected to the ring portions 3, respectively.
, 4 are integrally punched out so as to be connected to the inner edges of 4.

Each elastic contact piece 5 is punched out so that its central part is bent in the same direction at an angle α1, and a contact piece portion 5c that connects with the ring portion 3 on the open end side and a contact piece portion 5c that connects with the ring portion 4 on the closed end side are formed. The half portions 5d are inclined in opposite directions and extend linearly, and are connected to each other at a central portion approximately equidistant from both ring portions 3 and 4, forming a dogleg shape when viewed as a whole.

[0014] At this time, the bending angle α1 at the central portion is 90°.
The obtuse angle is set to be at least 100°, preferably between 110° and 140°. Further, as shown in FIG. 6, tapered portions 3c and 4c are formed on the outer edges of both ring portions 3 and 4 on the same surface side.

[0015] As described above, it is punched and formed, and then bent into a cylindrical shape to form a large-diameter open-end ring part 3 and a small-diameter closed-end ring part 4 into ring shapes. are formed so that they are concentric circles, and each ring part 3, 4
A split interval 3a, 4a is formed between the end portions of the ring part 3, and the ring part 3 is press-fitted into the cylindrical hole of the sleeve-shaped outer cylinder 1 with its diameter reduced by using the split interval 3a of the ring part 3. Tightly fit on the inner circumferential wall of the cylinder hole.

Further, both ring portions 3 and 4 are formed with annular tapered portions 3c and 4c that expand outward. At this time, the closed end side ring portion 3 is brought into contact with the inner circumferential wall surface of the outer cylinder 1 with weak contact pressure, or is slightly spaced apart and loosely inserted.

A plurality of dogleg-shaped lead clamping elastic contact pieces 5 extending between both ring portions 3 and 4 are connected to the inner contact 2.
in the circumferential direction, that is, the open end side ring part 3 and the closed end side ring part 4
The central part of each elastic contact piece 5 for lead clamping is bent into the inner area 6 of both ring parts 3, 4, and as a result of this bending, the center of each elastic contact piece 5 for lead clamping is bent in the circumferential direction. Department (
The bent portion) is twisted with respect to the outer cylinder axis Y, forming a pressure contact portion 8 that captures the insertion lead 7 at the same location.

As shown in FIGS. 3 and 4, the pressurized contact portion 8 changes from a state in which it is perpendicular to the diameter line L of the outer cylinder 1 shown by the imaginary line to an obtuse angle α2 with respect to the diameter line L as shown in the solid line. A twist angle α3 of about 110° to 130° is given, and the edge portion 9 is brought into contact with the circumferential surface of the lead 7.

More specifically, as shown in FIG. 3, one edge portion 9 on the inner surface side of the pressure contact portion 8 having a rectangular cross section of the lead clamping contact piece 5 of the inner contact 2 is connected to the ring portion 3, 4. It is bent so that it is placed in the inner circle of the inner circle, and a twist is applied at a twist angle α3. This twist angle α3 is set so that the pressure contact portion 8 and the diameter line L make an angle α2, and preferably α3 is about 20° to 40°. The above-mentioned twisted state of the elastic contact piece 5 can be determined, for example, by winding both ring parts 3 and 4 into a cylindrical shape, then twisting one ring around the axis, or twisting both rings in opposite directions around the axis. It can also be formed by giving.

[0020] The IC lead 7 is connected to the inner contact 2.
, the elastic contact piece 5 for holding the lead is bent or inclined in the same direction and has a sufficient spring length to receive the lead 7, and the pressure contact portion 8 in the center is pushed outward by the lead circumferential surface. Due to this pressure, the contact portion 8 is elastically displaced outward at a position circumferentially away from the connection portion at both ends of the elastic contact piece 5 as a fulcrum. Contacts the lead circumferential surface with appropriate contact pressure. Also, at this time, the edge portion 9 of the pressure contact portion 8 of the elastic contact piece 5 for holding the lead tends to bite into the lead surface and come into pressure contact, thereby removing the oxide film on the contact surface and achieving sound contact.

[0021]

According to the present invention, the elastic contact piece for holding a lead is extended between the closed end side ring part and the open end side ring part, and both ends of the same contact piece are connected to both ring parts, so that the elastic contact piece can come into contact with the lead. Therefore, even if the inner contact is miniaturized, the contact pressure by the elastic contact piece can be ensured, and by forming a pressurized contact part that holds the lead in the center of this double-sided elastic contact piece, proper contact can be achieved. .

Furthermore, since the plurality of lead clamping elastic contact pieces connected between the closed end side ring part and the open end side ring part are bent in the circumferential direction, or the elastic contact pieces extending from each ring part are curved in the circumferential direction. Since they are tilted in opposite directions to each other, a sufficient spring length can be ensured for the elastic contact piece for holding the lead.

[0023] Also, by bending and twisting the circumferentially curved or inclined elastic contact piece into the inner area of both ring parts, the edge part of the pressure contact part is brought into contact with the lead surface and the oxide film is removed. Highly reliable contact can be achieved by increasing the contact pressure. According to the present invention, the diameter of the inner contact and the size of the sleeve contact can be reduced while ensuring the reliability of contact with the lead.

[Brief explanation of drawings]

FIG. 1 is a side view of a sleeve contact showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a plan view illustrating a twisted state of a pressure contact portion in the inner contact.

FIG. 5 is a developed view showing a punched state of the inner contact.

FIG. 6 is a side view of the same.

[Explanation of symbols]

1 Sleeve-shaped outer cylinder 2 Inner contact 3 Opening end side ring part 4 Closed end side ring part 5 Elastic contact piece for lead clamping 6 Inner area of both rings 7 IC lead 8 Pressure contact part Y axis

Claims (3)

[Claims] 1. A sleeve contact as described above, wherein an inner contact is housed in a sleeve-like outer cylinder having a closed end and an open end, and a lead inserted from the open end is captured by the inner contact to obtain contact. The inner contact has a closed end side ring part and an open end side ring part, and has a plurality of elastic contact pieces for lead clamping extending between the two ring parts, and both ends of the elastic contact pieces are attached to the both rings. A sleeve contact characterized by being connected to a part. 2. A sleeve contact as described above, wherein an inner contact is housed in a sleeve-like outer cylinder having a closed end and an open end, and a lead inserted from the open end is captured by the inner contact to obtain contact. The inner contact has a closed end side ring part and an open end side ring part, and has a plurality of elastic contact pieces for lead clamping extending between the two ring parts, and both ends of the elastic contact pieces are attached to the both rings. The central portion of the elastic contact piece for holding the lead is bent in the circumferential direction of the sleeve-shaped outer cylinder, and is twisted with respect to the axis of the outer cylinder, and is bent toward the inner area of both the ring parts. A sleeve contact characterized by a built-in sleeve contact. 3. A sleeve contact as described above, wherein an inner contact is housed in a sleeve-like outer cylinder having a closed end and an open end, and a lead inserted from the open end is captured by the inner contact to obtain contact. The inner contact has a closed end side ring part and an open end side ring part, and has a plurality of elastic contact pieces for lead clamping extending between the two ring parts, and both ends of the elastic contact pieces are attached to the both rings. The contact piece portion connected to the closed end side ring portion of the elastic contact piece and the contact piece portion connected to the open end side ring portion of the elastic contact piece are respectively inclined in opposite directions with respect to the axis of the inner contact from each ring portion. A sleeve contact comprising a pressurized contact portion that extends in a direction and bends a connecting portion of both contact pieces extending at an angle into an inner area of both ring portions to apply twist and clamp the lead. .