Programmed shutter

Details Programmed shutter Programmed shutter

1974-10-31

1977-01-25

Peters, Jr., Joseph F.

354 48, 354 60R, 354230, 354234, G03B 708, G03B 902

Patent

active

040054489

ABSTRACT:
This invention relates to a programmed shutter designed to automatically provide suitable exposures to a camera wherein shutter blades serve also as diaphragm blades and a driving mechanism is intermittently actuated by impressed pulse signals. Suitable exposures are obtained by automatic stepwise selection of an appropriate aperture value in response to the objective brightness and then by automatic regulation of the exposure time under the selected aperture value, both being accomplished by an electronic circuit for feeding said pulse signals to actuate said blades.

REFERENCES:
patent: 3680460 (1972-08-01), Starp
patent: 3695158 (1972-10-01), Fahlenberg
patent: 3709137 (1973-01-01), Starp
patent: 3813680 (1974-05-01), Wagensonner et al.
patent: 3882522 (1975-05-01), Erlichman

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