Patent
1975-02-03
1977-02-08
Adams, Jr., Russell E.
354 50, 354 51, 354 60R, 354 60E, G03B 708
Patent
active
040074668
ABSTRACT:
An electrical system to be used for photographic purposes. The electrical system has an input circuit for providing a given input signal as well as an output circuit for utilizing the latter signal and an intermediate circuit electrically connected between the input and output circuits for controlling the transmission of the input signal to the output circuit. The input circuit includes a photoelectric converter in the form of a semiconductor which receives light and which has an open-circuit voltage which varies in the manner of a logarithmic compression depending upon the intensity of the received light so that the input signal is determined at least in part by the nature of the light received by the photoelectric converter. The intermediate circuit is electrically connected with the input circuit for providing for the latter a stabilized circuit condition in which the photoelectric converter is in a stabilized state where no current flows therethrough.
REFERENCES:
patent: 3695157 (1972-10-01), Miyakawa
patent: 3810203 (1974-05-01), Movi et al.
patent: 3820126 (1974-06-01), Haratake
patent: 3848986 (1974-11-01), Miyakawa et al.
Adams, Jr. Russell E.
Asahi Kogaku Kogyo Kabushiki Kaisha
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