Program type exposure controlling device

Details Program type exposure controlling device Program type exposure controlling device

1983-11-07

1984-06-26

Adams, Russell E.

G03B 708, G03B 7087, G03B 7097

Patent

active

044563612

ABSTRACT:
A program type exposure controlling device comprising, a circuit for generating an object brightness information, an aperture setting circuit for setting a preset stepwise aperture in accordance with the object brightness information, and a shutter speed determining circuit for determining a shutter speed in accordance with the object brightness information and the aperture information from the aperture setting circuit. The circuit for generating the object brightness information generates either an object brightness information or an object brightness information, which is prepared by correcting the former information in accordance with another exposure information. The program type exposure controlling device comprises a decoder circuit DEC for determining a shutter speed and an aperture value by decoding the digital brightness information. The decoder circuit DEC comprises a shutter speed determining circuit for determining a shutter speed in accordance with the digital brightness information and an aperture determining circuit for determining an aperture value in accordance with the digital brightness information, the shutter speed determining circuit and the aperture determining circuit being operated independently with each other. The decoder circuit further comprises a circuit for generating a rank information in accordance with the digital brightness information, and aperture determining circuit for determining a preset stepwise aperture corresponding to the rank. The program type exposure controlling device comprises an aperture setting mechanism which comprises:

REFERENCES:
patent: 4054887 (1977-10-01), Holle et al.
patent: 4174160 (1979-11-01), Namba et al.
patent: 4210393 (1980-07-01), Ishiguro et al.
patent: 4245900 (1981-01-01), Nakamoto et al.

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