Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1982-07-21
1985-08-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250204, G01J 120
Patent
active
045352313
ABSTRACT:
A photodetector output circuit comprises a plurality of adjacent photodetectors grouped into pairs having first and second photodetectors for generating signals indicative of levels of light falling thereon, a first shift register for receiving the signals from the first photodetectors in the pairs, a second shift register for receiving the signals from the second photodetectors in the pairs, and a pair of first and second sample and hold circuits for successively sampling and holding outputs from final stages of the first and second shift registers, respectively. A comparator receives as inputs outputs from the first and second sample and hold circuits for delivering out signals when the received inputs have a level difference of a predetermined value or higher. With this arrangement, the photodetector output circuit can produce digital signals indicative only of abrupt changes in the level of incident light and excludes any influence due to gradual light level variations which would result from shading.
REFERENCES:
patent: 4252425 (1981-02-01), Aohi et al.
patent: 4255028 (1981-03-01), Aohi
patent: 4298259 (1981-11-01), Aohi et al.
patent: 4329577 (1982-05-01), Asano et al.
patent: 4377342 (1983-03-01), Kawabata et al.
Gatto J.
Hitachi Denshi Kabushiki Kaisha
Nelms David C.
Pfund Charles E.
LandOfFree
Photodetector output circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photodetector output circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photodetector output circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2319705