Printed circuit board testing

Details Printed circuit board testing Printed circuit board testing

1975-07-16

1977-03-15

Strecker, Gerard R.

Electricity: measuring and testing

Plural, automatically sequential tests

29593, 324 52, G01R 3102, G01R 3108

Patent

active

040126935

ABSTRACT:
A tester locates wiring defects such as short circuits between printed wires on a printed circuit board wiring pattern by registration with a mirror image pattern. To identify a particular defect location on the pattern, a test jig is prepared by placing a pattern of insulating material on a flexible conductive screen to be held a short distance away from the corresponding conductive pattern of the identical shape on the printed circuit board. By scanning the pattern with a roller forcing the two patterns into contact with each other, current is passed from the screen through the wiring board at any scan position where the conductive printed circuit board pattern exceeds its boundary limits or short circuits adjacent conductors. Provision is made to read automatically X and Y coordinate positions of a defect location into a register.

REFERENCES:
patent: 2887622 (1959-05-01), Rayburn et al.
patent: 3501698 (1970-03-01), Becknell
patent: 3617876 (1971-11-01), Robinson
patent: 3723867 (1973-03-01), Canarutto
DeGroat et al., Finding Shorts In Printed Circuit Boards IBM Tech. Disclosure Bulletin vol. 12, No. 5, Oct. 1969, pp. 655, 666.
Dodd et al. Printed-Circuit Tester IBM Technical Disclosure Bulletin vol. 16, No. 9, Feb. 1974 pp. 2848, 2849.

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