Test coupons for determining the registration of subsurface laye

Details Test coupons for determining the registration of subsurface laye Test coupons for determining the registration of subsurface laye

1982-11-03

1985-04-09

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 51, 324 73PC, 324 65R, G01R 3122

Patent

active

045104468

ABSTRACT:
The present disclosure describes test coupons having predetermined respective test patterns, formed in a multilayer printed circuit board simultaneously with the fabrication of the latter. The test coupons are probed with conventional electrical instruments to provide information as to the occurrence of a misregistration of any given subsurface printed plane or trace, whether or not the misregistration exceeds a specified limit, and if desired, a measure of the degree of misregistration. The foregoing are readily accomplished in a time and cost efficient manner without the need for cross-sectioning portions of the board and the visual observation of the subsurface printed layers.

REFERENCES:
patent: 3517144 (1970-06-01), Arsenault et al.
patent: 3859711 (1975-01-01), McKiddy
patent: 4432037 (1984-02-01), Brabetz
patent: 4443756 (1984-04-01), Lightbody et al.

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