Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1992-01-27
1993-10-12
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324158F, G01R 1073, G01R 3102
Patent
active
052529169
ABSTRACT:
A fluid actuated test fixture with springless contacts for use in the automatic testing of printed circuit boards is connected to an electronic circuit tester for performing high-speed testing of circuits on the board. The fixture includes a housing, an inner chamber formed by covering the opening of an air chamber housing with an elastomeric diaphragm, a support plate with a flex circuit laminated along one side, and an array of solid (springless) test probes disposed in the support plate for access to a surface of the circuit board. When the circuit board to be tested is placed on the fixture, a vacuum drawn between the circuit board and support plate urges the circuit board to contact the test probes. When the pressure within the inner chamber is increased, the probes move into the diaphragm to stretch the diaphragm and the diaphragm applies a resilient spring-like counter-force against the test probes in unison, which transfers the spring force to the test points on the board under test. A set of electrical test signals is communicated from the test probes through printed circuits on the flex circuit and through an array of interface pins connected to the circuit traces on the flex circuit.
REFERENCES:
patent: 3016489 (1962-01-01), Briggs et al.
patent: 3714572 (1973-01-01), Ham et al.
patent: 4061969 (1977-12-01), Dean
patent: 4115735 (1978-09-01), Stanford
patent: 4232928 (1980-11-01), Wickersham
patent: 4340858 (1982-07-01), Malloy
patent: 4963821 (1990-10-01), Janko et al.
patent: 4968931 (1990-11-01), Littlebury et al.
Everett Charles Technologies, Inc.
Karlsen Ernest F.
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