Photodetector output circuit

Details Photodetector output circuit Photodetector output circuit

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.

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