Title: Electrical system having a photoelectric converter to be used in photography

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.

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Inventors: Miyakawa, Seinan (Tokyo, JA)

Application Number: 546563
Filing Date: 1975-02-03
Publication_date: 1977-02-08
Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha (JA)
Primary Class(es): 396/228 396/252, 396/293
Other Classes:
US Patent Ref:

3695157	Oct, 1972	Miyakawa	354/51.
3810203	May, 1974	Movi et al.	354/51.
3820126	Jun, 1974	Haratake	354/51.
3848986	Nov, 1974	Miyakawa et al.	354/51.

Other Refs:
Primary Examiner: Adams, Jr., Russell E.
Assistant Examiner:
Attorney: Steinberg & Blake