Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-07-24
1992-09-01
Hannaher, Constantine
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
358406, 358483, H04N 1028, H04N 1387
Patent
active
051441322
ABSTRACT:
A device for inspecting a printed board has linear image sensors. The image sensors read the image of the printed board on respective image reading positions (CA0, CB0, CA1, CB1), while scanning the image. A predetermined tolerance range (RY) for image-reading positions is previously determined so that the respective image reading positions are included in the tolerance range. Image signals obtained in respective image sensors are delayed by respective delay times. The respective delay times are previously determined in proportion to the deviations between the image reading positions and a reference position (RLY1), where the reference position is defined on the rear end (EPY1) or behind the tolerance range in the scanning direction (-Y). Through the delay process, all of the image signals are corrected to compensate for the respective deviations in the image reading positions.
REFERENCES:
patent: 4691114 (1987-09-01), Hasegawa et al.
patent: 4821110 (1989-04-01), Murakami
patent: 4999717 (1991-03-01), Nagashima
patent: 5075539 (1991-12-01), Shiraishi
Dainippon Screen Mfg. Co,. Ltd.
Glick Edward J.
Hannaher Constantine
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