Photoelectric conversion apparatus

Details Photoelectric conversion apparatus Photoelectric conversion apparatus

1983-10-27

1986-07-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358213, H01J 4014

Patent

active

046008438

ABSTRACT:
Analog switches are connected between corresponding photodiodes and a common output line. The analog switches are sequentially scanned in response to scanning pulses. During the ON period of each scanning pulse, the corresponding analog switch is turned on twice. A first circuit produces a first signal, including an image signal component and a noise signal component, when the analog switch is turned on for the first time, and produces a second signal including only the noise signal component, when the analog switch is turned on for the second time. A second circuit produces the signal derived from the difference between the first and second signals, i.e., the image signal.

REFERENCES:
patent: 4045817 (1977-08-01), Nakatani et al.
patent: 4283742 (1981-08-01), Izumita et al.
patent: 4390894 (1983-06-01), Raven
patent: 4511804 (1985-04-01), Ozawa

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