Method of and apparatus for inspecting printed circuit boards

Details Method of and apparatus for inspecting printed circuit boards Method of and apparatus for inspecting printed circuit boards

1990-03-01

1991-07-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356394, G01N 2188

Patent

active

050327356

ABSTRACT:
Disclosed is a method of and apparatus for inspecting a printed circuit board (PCB) for the nature of its soldered parts comprising three ring-shaped light sources which project light of different hues, the highest light source being any hue other than red, to a part mounted on a PCB at different angles and heights from above, a camera to record the reflected images, and a procedure used to check the recorded patterns to determine if the soldering is acceptable.

REFERENCES:
patent: 4500203 (1985-02-01), Bieringer
patent: 4541007 (1985-09-01), Nagata
patent: 4803645 (1989-02-01), Ohtomo et al.
patent: 4876455 (1989-10-01), Sanderson et al.
patent: 4894790 (1990-01-01), Yotsuya et al.
patent: 4942618 (1990-07-01), Sumi et al.
IEE Transactions on Pattern Analysis and Machine Intelligence, vol. 10, No. 1, Jan. 1988, pp. 44-55, "Structured Highlight Inspection of Specular Surfaces", Arthur C. Sanderson et al.

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