Electrical connectors – Coupling part having handle or means to move contact...
Patent
1998-05-08
2000-10-31
Donovan, Lincoln
Electrical connectors
Coupling part having handle or means to move contact...
439264, H01R 1122
Patent
active
061393487
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a contact pin having an improved structure adapted to contact to and separate from a spherical terminal of an electronic part such as semiconductor, (called IC package hereinlater) and an improved electric connector using the contact pin.
BACKGROUND ART
As a conventional one of such contact pin, there is provided the contact pin, for example, shown in FIGS. 18 and 19 (see Japanese Utility Model Laid-open Publication No. SHO 60-109272). A contact 1 corresponding to such "contact pin" is formed of a sheet of metal plate by bending the same, and a pair of contact pieces 2 and 3 are formed to the contact 1. As shown in FIG. 19, a rod-like pin terminal 4 is inserted between both the contact pieces 2 and 3 and an electrical connection is established through the contact of the pin terminal 4 to the contact pieces 2 and 3.
In more detail, one 2 of the contact pieces is formed with a slit portion 2a and the other one 3 thereof is formed with a cut-stand portion 3a. The rod-like pin terminal 4 contacts respective corner portions 2b and 3b of these slit portion 2a and theut-stand portion 3a to thereby establish the electrical conduction therebetween.
However, in such conventional structure of the distance L is not made short so much.
Furthermore, when the positional relationship between the pin terminal 4 and the contact pieces 2 and 3 at a portion at which such contact 1 is arranged, a is shifted, the pin terminal 4 cannot contact exactly to the corner portions 2b and 3b of the contact pieces 2 and 3, which may result in the lowering of the electrical conduction performance.
Then, the present invention has an object to provide a contact pin and an electric connector having advantage in location space and ensuring the electrical conduction performance.
DISCLOSURE OF THE INVENTION
In order to achieve the above object, according to the present invention, there is provided a contact pin having a long plate shape in which a contacting portion formed to a front end portion thereof is contacted to and separated from side surfaces of a spherical terminal of an electric part through an elastical deformation of the contact pin, the contact pin being characterized in that the contacting portion has a central portion having a thickness less than that of both side edge portions in a width direction thereof, two inclining surfaces are formed to the contacting portion so as to be contacted to and separated from the spherical terminal, and tangential lines at contacting portions of both the inclining surfaces and the spherical terminal are directed to the center.
According to this structure, since the central portion of the contact pin is made less in thickness than that both the side edge portions thereof in the width direction and the inclining surfaces are formed, the spherical terminal is inserted into the thin thickness portion, so that a space is reduced in comparison with a flat shape contact pin. Furthermore, according to the provision of the inclining surfaces, the spherical terminal is guided therealong to precisely locate the spherical terminal to a predetermined position, and moreover, through the sliding motion of the spherical terminal along the inclining surfaces, the wiping effect can be achieved.
In a preferred embodiment, the inclining surface is formed only to the front end contacting portion.
According to this structure, in addition to the above effect, the sectional secondary moment can be made large by forming the inclining surface only to the contacting portion, thereby reducing the twisting and flexing functions, thus making large the contact pressure between the spherical terminal and the contact pin.
In a further preferred embodiment, the front end portion is formed so as to provide two-fork shape as branched pieces to which the inclining surfaces are formed respectively.
According to this structure, in addition to the above effects, the wiping effect can be further improved because the flexing force as well as twisting force is caused to the respecti
REFERENCES:
patent: 5002499 (1991-03-01), Matsuoka
patent: 5646447 (1997-07-01), Ramsey et al.
Donovan Lincoln
Enplas Corporation
Nasri Javaid
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