Method and apparatus for inspecting plated through holes in prin

Details Method and apparatus for inspecting plated through holes in prin Method and apparatus for inspecting plated through holes in prin

1983-11-23

1985-12-24

Kittle, John E.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356239, 356241, G01N 2188

Patent

active

045602735

ABSTRACT:
In inspecting plated through holes in printed circuit boards, light from a light source is introduced into the light conducting substrate of the printed circuit boards having through holes. A light detector senses the light in the holes. The detected through holes are masked to prevent the light from entering the through hole of the substrate. A light detector senses light leaked to the hole. By signals supplied from the light detectors, the plated through holes can be continuously and efficiently inspected.

REFERENCES:
patent: 3698821 (1972-10-01), Ekstrand
patent: 4145714 (1979-03-01), MacDonald et al.
patent: 4302105 (1981-11-01), Sick
patent: 4447152 (1984-05-01), Rainford et al.

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