Visual method of locating faults in printed circuit boards

Details Visual method of locating faults in printed circuit boards Visual method of locating faults in printed circuit boards

1975-02-28

1976-08-24

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356168, 356237, G01B 908, G01N 2116

Patent

active

039763838

ABSTRACT:
A method of visually detecting defects in a printed circuit board comprising preparing a mask with a light blocking pattern corresponding to the desired printed circuit, illuminating the printed circuit board through the mask with the light of a color complimentary to the color of the printed circuit board and with the light blocking pattern in registry with the printed circuit and inspecting the printed circuit board for light reflected from defects in the printed circuit not present in the light blocking pattern on the mask. The defects are readily apparent as bright spots on a dark background.

REFERENCES:
patent: 3711205 (1973-01-01), Tulk et al.
patent: 3713741 (1973-01-01), Sheehan

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