Exposure controlling device adapted to cameras using interchange

Details Exposure controlling device adapted to cameras using interchange Exposure controlling device adapted to cameras using interchange

1982-02-16

1984-10-23

Adams, Russell E.

G03B 708

Patent

active

044785003

ABSTRACT:
An exposure controlling device comprising a means of discriminating to what zone of exposure zones sectioned in advance an exposure value determined by considering the brightness information of an object to be photographed obtained by a TTL light measurement under the maximum diaphragm aperture and the film sensitivity of the film to be used belongs, a means of determining a diaphragm value simultaneously with and in response to the discrimination of the exposure zone and a means of comparing the determined diaphragm value with the F-number of a photographing lens to be used and controlling a proper exposure time corresponding to said diaphragm value so that a diaphragm aperture and shutter speed for obtaining a proper exposure can be automatically set without making any special switching operation even in the case of using any photographing lens different in the F-number. The means of determining the diaphragm value includes a member which can be intermittently driven by a pulse signal. By the initial motion of this member, a mirror mechanism or automatic focus adjusting device can be released.

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patent: 4324467 (1982-04-01), Shiozawa
patent: 4385819 (1983-05-01), Toyoda et al.

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