Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
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
Hiramatsu Kenichi
Ishida Tsuyoshi
Kizu Shuji
Miura Junji
Allen Stephone B.
Nelms David C.
Tokyo Shibaura Denki Kabushiki Kaisha
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