JPH02275365A - Contact pin - Google Patents

Abstract

PURPOSE:To bring a contactor into contact with an electrode pad accurately by arranging a spiral or zig zag guide groove in which a contact pin extends in one direction of the contactor or a sleeve while a pin to be fitted into the groove is imbedded on the other hand to keep the contactor in contact with the surface of the electrode pad rotating the contactor. CONSTITUTION:A pin 7 having a contact pin imbedded into an outer surface of a contactor 1 and a spiral groove 8 being fitted into the pin 7 and extending in one direction are provided on an inner wall of a sleeve 2. When the contactor 1 of the contact pin gets in contact with an electrode pad 5, the pin 7 imbedded into the contactor 1 is forced with the groove 8 so that the contactor 1 turns in the direction of the arrow 9. With the rotation thereof, dust or an oxide film on the surface of the electrode pad 5 is removed with the contactor 1, thereby bringing the contactor 1 into contact with the electrode pad 5 accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a contact pin used for electrically connecting two conductors.

[Conventional technology]

Conventionally, this type of contact pin has been widely used as a probe for testing the characteristics of semiconductor devices or testing equipment. Furthermore, various efforts and improvements have been made to this contact pin in order to prevent poor contact and the like from occurring.

FIG. 5 is a sectional view of a contact pin showing an example of the conventional method, and FIGS. 6(a) and (b) are sectional views of the contact pin shown in FIG. 5 showing the contact pin in non-contact and contact states. be. As shown in FIG. 5, this contact pin consists of a contact 1 made of a round bar made of a conductive material, a sleeve 2 into which the contact 1 is fitted, and into which the contact 1 can slide in one direction. A coil spring 3 is inserted into the sleeve 2 to lift the contact 1 upward. 6 As shown in FIG. 6 (a), the contact pin connected to the electrode pad of the circuit board 6 When the coil spring 3 is not in contact with the electrode pad 5 of the circuit board 4, the coil spring 3 maintains its free length and the contact 1 is located upward. When making contact, the contact 1 is pressed against the electrode pad 5 by the compressive force of the coil spring 3, as shown in FIG. 6(b).
The electrode pad of the circuit board 6 and the electrode i<.7 dot 5 of the circuit board 4 are electrically connected.

[Problem to be solved by the invention]

With the conventional contact pins described above, the contactor is pressed against the electrode pad in one direction to make electrical connection between the electrode pads (Rads). There is a problem that electrical contact cannot be made properly due to oxidation of the surface of the pad, making it impossible to accurately transmit electrical signals.

An object of the present invention is to provide a contact pin that can make good contact even if dirt or an oxide film is formed on the contact surface.

[Means to solve the problem]

The contact pin of the present invention includes a contact made of a conductive metal rod, a sleeve in which the contact is fitted and can slide in one direction, and inserted into the sleeve between one end of the sleeve and one end of the contact. A contact pin having a coil spring having a meandering or spiral groove in the sliding direction on one of the outer surface of the contactor or the inner surface of the sleeve, and a pin that fits into the groove on the other side. Embedded and configured.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of a contact pin showing a first embodiment of the present invention, and FIG. 2 is a sectional view of the contact pin shown in FIG.

This contact pin includes a pin 7 embedded in the outer surface of the contactor 1, and a spiral groove 8 that fits into the pin 7 and extends in one direction on the inner wall of the sleeve 2. Other than this, it is the same as the conventional example.

With this structure, as shown in FIG. 2, when the contact 1 comes into contact with the electrode pad 5, the pin 7 embedded in the contact 1 is forced into the G pin 7 by the groove 8. Therefore, the contact 1 rotates in the direction of the arrow 9. This rotating action ensures that the electrode pad 5 and the contact 1 come into contact with each other while the contact 1 removes dust or oxide film on the surface of the electrode pad 5.

Here, instead of this spiral groove, a spiral slit may be formed, which is easy to manufacture.

FIG. 3 is a cross-sectional view of a contact pin showing a second embodiment of the present invention, and FIG. 4 is a cross-sectional view of the contact pin showing the state of the contact pin of FIG. 2 at the time of contact. In this embodiment, as shown in FIG. 3, a meandering groove 8a is formed instead of the spiral groove 8a described in the first embodiment.

By forming such a groove 8a, as shown in FIG. 4, the contact 1 repeatedly rotates in the clockwise and counterclockwise directions shown by the arrow 9a, removing dust or oxide film from the surface of the electrode pad 5. Remove to ensure contact with the contact and electrode pad.

In the embodiment described above, the groove is formed on the sleeve side, and the contact (
Although the explanation has been given on the case where a pin is provided on the sleeve side, the same effect can be obtained even if the pin is provided on the sleeve side and the groove is provided on the contact side.

〔Effect of the invention〕

As explained above, the contact pin of the present invention provides a spiral or meandering guide groove extending in one direction on one side of the contact or the sleeve, and embeds a pin that fits in this groove on the other side. Since the contactor contacts the surface of the electrode pad while rotating, this rotational action removes dirt and oxide film from the surface of the electrode pad, thereby ensuring reliable contact between the contactor and the electrode pad. Therefore, even if there is dirt or an oxide film on the contact surface, it is possible to ensure electrical connection.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a contact pin showing a first embodiment of the present invention, FIG. 2 is a sectional view of the contact pin shown in FIG. Fourth sectional view of a contact pin showing a second embodiment of the invention
The figure is a cross-sectional view of the contact pin showing the contact state of the contact pin in Figure 2, Figure 5 is a cross-sectional view of the contact pin showing a conventional example, and Figures 6 (a> and (b) are Figure 5). It is a cross-sectional view of the contact pin showing the non-contact state and the contact state of the contact pin shown in 1. 1... Contactor, 2... Sleeve, 3... Coil spring, 4. 6... Circuit Substrate, 5... Electrode pad, 7.
...Pin, 8.8a...Groove, 9.9a...Arrow.

Claims (1)

[Claims] It has a contact made of a conductive metal rod, a sleeve in which the contact is fitted and can slide in one direction, and a coil spring inserted into the sleeve between one end of the sleeve and one end of the contact. In the contact pin, a groove formed in a meandering or spiral shape in the sliding direction is formed on one of the outer surface of the contactor or the inner surface of the sleeve, and a pin that fits into the groove is embedded in the other. A contact pin featuring