Method of and apparatus for inspecting printed circuit boards an

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

1989-11-22

1991-08-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356376, 358 88, G01N 2188

Patent

active

050398687

ABSTRACT:
Disclosed is a substrate inspecting method in which light is projected to a part (21) mounted on a substrate (20) from a ring-shaped light source (29), reflected light form the surface of a soldered portion (44) is imaged by an imaging unit (32) and the nature of the soldered portion is inspected by its imaged pattern, characterized by applying fluorescent agents (70) to at least the periphery of the soldered portion of the mounted part on the surface of the substrate, exposing the surface coated with the fluorescent agents to light from the ring-shaped light source to excite the fluorescent agents, exposing the surface of the soldered portion to secondary illuminating light produced by the fluorescent agents to image its reflected light.

REFERENCES:
patent: 4343553 (1982-08-01), Nakagawa et al.
patent: 4541007 (1985-09-01), Nagata
patent: 4571616 (1986-02-01), Haisma et al.
patent: 4803645 (1989-02-01), Ohtomo et al.
patent: 4894790 (1990-01-01), Yotsuya et al.
patent: 4942615 (1990-07-01), Sumi et al.
Patent Abstracts of Japan, vol. 10, No. 183 (P--472)(223), Jun. 26, 1986.
Patent Abstracts of Japan, vol. 11, 345 (P--636)(2792), Nov. 12, 1986.
Patent Abstracts of Japan, vol. 12, No. 90 (P--679)(2937), Mar. 24, 1988.
"A System for PCB Automated Inspection Using Fluorescent Light", I.E.E.E. Transactions On Pattern Analysis and Machine Intelligence, vol. 10, No. 1, Jan. 1988, pp. 69-78, New York, U.S.A.

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