Cameras and circuits for sensing the action of camera shutters

Details Cameras and circuits for sensing the action of camera shutters Cameras and circuits for sensing the action of camera shutters

1981-11-13

1984-01-10

Gellner, Michael L.

G03B 7097

Patent

active

044250320

ABSTRACT:
In the disclosed cameras, movable shutter members which cover a main aperture define a sub-aperture which is arranged first to close from a pre-opened state and then to open so as to control the exposure on the basis of brightness information. A first detector produces a first signal when the sub-aperture is closed, a second detector produces a second signal after a time determined by the brightness information, and a shutter detector is controlled by the first and second detectors to inform an operator that the shutter members have operated normally.

REFERENCES:
patent: 4174893 (1979-11-01), Burgarella et al.
patent: 4176929 (1979-12-01), Ito et al.

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