Coil spring-pressed needle contact probe modules with offset nee

Details Coil spring-pressed needle contact probe modules with offset nee Coil spring-pressed needle contact probe modules with offset nee

1993-11-08

1995-05-09

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

G01R 104

Patent

active

054143691

ABSTRACT:
In a contact probe having a pair of needle members elastically projecting from two ends thereof for temporarily connecting two points by contacting them with the two needle members, a coil spring interposed between the needle member consists of material having a low electric resistance, and is securely connected to the rear ends of the associated needle members at its two ends by soldering, brazing, welding, or wire-wrapping to establish an electroconductive path between the two needle members. Thus, the two needle members are substantially directly connected with each other via the compression coil spring serving as an electric conductor, and the electric resistance between them can be kept low and stable. The elimination of a separate conductor to be connected between the two needle members allows the diameter and the length of the contact probe to be reduced. The same goal can be achieved by forming at least one of the needle members with an extension of an associated end of the coil spring, with the added advantage of simplicity. Each contact probe module is confined within a four layered insulative holder having offset bores such that needle members protruding from one holder surface are at a different lateral spacing and hence density than the needles protruding from a second parallel holder surface.

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