Photo-electric converter having offset voltage correcting functi

Details Photo-electric converter having offset voltage correcting functi Photo-electric converter having offset voltage correcting functi

1988-09-21

1990-05-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214SW, H01J 4014

Patent

active

049240811

ABSTRACT:
A photo-electric converter according to the present invention has a switching element connected between a photosensitive element and a photo-electric converting circuit and another switching element connected in parallel with the photosensitive element, and an output from the photo-electric converting circuit obtained by turning on and off the switching element is analogue-to-digital converted and arithmetically processed. Thereby an offset voltage in the photo-electric converter circuit can be corrected and an accurate output can be obtained by the photo-electric conversion.

REFERENCES:
patent: 3584222 (1971-06-01), Nesbitt
patent: 3820898 (1974-06-01), Olson
patent: 3927317 (1975-12-01), Liedholz
patent: 4172221 (1979-10-01), Iizuka
patent: 4201472 (1980-05-01), Maeda
patent: 4552446 (1985-11-01), Suda et al.
patent: 4650986 (1987-03-01), Maile
patent: 4814602 (1989-03-01), Imura

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