Self leveling and self tensioning membrane test probe

Details Self leveling and self tensioning membrane test probe Self leveling and self tensioning membrane test probe

1993-02-25

1995-10-24

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324 731, 439 66, 439 73, 439482, G01R 104, G01R 106, G01R 3102

Patent

active

054613264

ABSTRACT:
A test probe including a flexible membrane (12) having an array of test probe contacts (14) capable of softly and gently contacting pads on a device under test is provided with a structure that effectively applies tension to the membrane while at the same time automatically leveling the membrane and removing distortions. A small pressure plate (30) is bonded to the inner surface of the membrane behind the test probe contacts. A pressure post (58) having a pointed or rounded end (64) is pressed against the pressure plate (30a) and makes pivotal contact with the plate. A spring (50) including an adjustment screw (56) that axially adjusts the compression of the spring, applies pressure through the pivot point to the pressure plate and thus to the membrane at its test probe contacts. When the probe contacts (14) are pressed against a device to be tested, the probe contacts and pressure plate (30) rotate about the pivot point (64) of the pressure post (58), and thereby both planarize the test probe contact array (14 ) and level the test contact array while appropriately tensioning the membrane.

REFERENCES:
patent: 4636722 (1987-01-01), Ardezzone
patent: 4906920 (1990-03-01), Huff et al.
patent: 5334029 (1994-08-01), Akkapeddi et al.

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