Patent
1974-07-09
1976-04-13
Hix, L. T.
354 38, 354 43, 354 50, 354 51, 354 60R, G03B 708
Patent
active
039507653
ABSTRACT:
In an exposure control device for a photographic camera a shutter speed control signal generating circuit measures scene light transmitted through an objective lens and a diaphragm for automatically controlling the shutter speed commensurate to the measured light output. A control output signal is generated in response to a manually selectable shutter speed. A diaphragm control device controls the diaphragm aperture according to the difference in the light measuring output and shutter speed output signal. The light measuring and shutter speed output signals are selectively connectable to a shutter speed control device for exposure control. A portion of the automatic shutter speed control signal is added to the manually selected shutter speed control signal so that diaphragm aperture control is effected according to the difference between the combined signal and the automatic shutter speed control signal. Control of the diaphragm and shutter speed as well as programmed exposure control of the shutter speed and diaphragm aperture commensurate with the brightness of an object are effected.
REFERENCES:
patent: 3554104 (1971-01-01), Winkler et al.
patent: 3638544 (1972-02-01), Kitai
patent: 3829867 (1974-08-01), Ono
Nanba Yasuhiro
Tsujimoto Kayoshi
Yamada Seiji
Adams, Jr. Russell E.
Hix L. T,.
Minolta Camera Kabushiki Kaisha
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