Automatic diaphragm control and mirror release devices for camer

Details Automatic diaphragm control and mirror release devices for camer Automatic diaphragm control and mirror release devices for camer

1981-05-01

1982-07-13

Hix, L. T.

354 43, 354152, G03B 7095

Patent

active

043391869

ABSTRACT:
In a camera automatic diaphragm control device of the type wherein scene light is measured through the diaphragm aperture during the stopping-down operation thereof, which is arrested when the measured light value reaches a given level with respect to manually set exposure parameters, thereby determining the diaphragm aperture, structure is provided for positively ensuring that the diaphragm aperture is left fully open when the set exposure parameters and the measured light require such diaphragm aperture setting. The diaphragm aperture control device is employed in a single lens reflex camera with a reflex mirror retractable from a viewing position at selected times in dependence on whether the diaphragm aperture remains fully open or is reduced.

REFERENCES:
patent: 3777637 (1973-12-01), Kuramoto et al.
patent: 3896472 (1975-07-01), Yoshiyama
patent: 3922693 (1975-11-01), Matsui
patent: 4142787 (1979-03-01), Ueda et al.
patent: 4264159 (1981-04-01), Ueda et al.

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