Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-02-27
1990-05-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356394, G01N 2186
Patent
active
049298453
ABSTRACT:
Inspection of a circuit board (10) to detect missing and misaligned active and passive surface-mounted components (12) and (14), respectively, is accomplished by first illuminating the board with top light to enhance the image of the passive components. The circuit board is then displaced, relative to a linescan camera (28) trained on the board, so that the camera captures the image of successive strips of surface area running across the board perpendicular to its direction of movement. The images captured by the camera (28) are stored and thereafter processed by an image-processing system (33) to determine whether any passive component is missing or misaligned. The circuit board is then illuminated with side light to enhance the image of the active components. The circuit board is again displaced relative to the linescan camera so the camera captures the image of successive strips of surface area on the board. The captured images are stored and then processed by the image-processing system to detect whether any of the active surface-mounted components are missing or misaligned.
REFERENCES:
patent: 3069654 (1962-12-01), Hough
patent: 3695771 (1972-10-01), Bardos
patent: 3794427 (1974-02-01), Shibata et al.
patent: 3796500 (1974-03-01), Obser
patent: 3877814 (1975-04-01), Hess et al.
patent: 3962681 (1976-06-01), Requa et al.
patent: 4131804 (1978-12-01), Sick et al.
patent: 4240750 (1980-12-01), Kurtz et al.
patent: 4295198 (1981-10-01), Copeland
patent: 4379308 (1983-04-01), Kosmowski et al.
patent: 4473842 (1984-09-01), Suzuki et al.
patent: 4545070 (1985-10-01), Miyagawa et al.
patent: 4569079 (1986-02-01), Yoshida
patent: 4570181 (1986-02-01), Yamamura
patent: 4578810 (1986-03-01), MacFarlane et al.
patent: 4677303 (1987-06-01), Erdman
patent: 4803871 (1989-02-01), Harada et al.
W. M. Hastie, Circuits Manufacturing, Feb. 1985, pp. 72-90, "Machine Vision Eyes Loaded Boards."
S. W. Fields, Electronics, Aug. 25, 1983, pp. 163-164, "System Inspects Board in 2.4 Seconds."
D. Marro, Research & Development, May, 1985, pp. 114-116, "Does Your PCB Assembly Line Have Eyes?"
Amir Israel
Higgins Frank P.
AT&T Bell Laboratories
Levy Robert B.
Nelms David C.
LandOfFree
Method and apparatus for inspection of substrates does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for inspection of substrates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for inspection of substrates will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-522990