Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1983-06-22
1986-02-18
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324158F, 338 99, 338114, G01R 3102, H01C 1010
Patent
active
045715424
ABSTRACT:
A method for inspecting printed wiring boards which comprises superposing, on a printed wiring board to be inspected, a pressure-sensitive, electroconductive, elastic sheet, any portions of which become electroconductive in the direction of thickness of the elastic sheet when the portions have been pressed in the same direction, pressing the elastic sheet at portions corresponding to the electroconductive portions of said board by the use of inspecting electrodes, thereby electrically connecting the corresponding inspecting electrodes to the intended electroconductive portions of the printed wiring board. In said method, there is preferably used an inspecting unit which comprises the above-mentioned elastic sheet and an insulating, inspecting-electrode-holding plate provided so as to face the other side of said elastic sheet at a space, said inspecting electrode-holding plate holding a group of inspecting electrodes projecting from the plate surface into the space, said group of inspecting electrodes being arranged so as to correspond to an arrangement pattern of electroconductive portions of the printed wiring board to be inspected, and the inspecting electrode-holding plate being provided so that it can be relatively pressed in the direction of approaching the printed wiring board.
REFERENCES:
patent: 4115735 (1978-09-01), Stanford
patent: 4258100 (1981-03-01), Fujitani et al.
patent: 4302361 (1981-11-01), Kotani et al.
patent: 4357266 (1982-11-01), Sado et al.
IBM Technical Disclosure Bulletin, Holmstrom, L., "Electrical Fixture for Printed-Circuit Assemblies", vol. 20, No. 8, Jan. 1978, p. 2934.
Baker Stephen M.
Japan Synthetic Rubber Co. Ltd.
Levy Stewart J.
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