Camera having shutter instrumentation device for measuring shutt

Details Camera having shutter instrumentation device for measuring shutt Camera having shutter instrumentation device for measuring shutt

1996-10-16

1998-06-02

Metjahic, Safet

Photography

Exposure control circuit

Velocity control of shutter or diaphragm component

396273, 396484, G03B 700, G03B 7099, G03B 940

Patent

active

057615527

ABSTRACT:
A camera which can detect the actual opening/closing state of the camera shutter based on a signal reflected towards the shutter by a signal projection unit and received by a signal receiving unit. The signal received by the signal receiving unit is based on the reflectivity of the shutter and, therefore, the signal received by the signal receiving unit is different depending on whether or not the shutter is open or closed. The camera has a reflectivity state detection unit for determining the reflectivity status of the shutter. A reflectivity standard changing unit changes the detection standard of the signal receiving unit based on information output by the reflectivity state detection unit. In this manner, changes in reflectivity of the shutter, due to passage of time or increase in use, will not reduce the accuracy of the detection of the open/close status of the shutter.

REFERENCES:
patent: 3913376 (1975-10-01), Scott
patent: 3956758 (1976-05-01), Numata et al.
patent: 4907027 (1990-03-01), Kobe et al.
patent: 5014082 (1991-05-01), Farrington
patent: 5181063 (1993-01-01), Tagami et al.
patent: 5225865 (1993-07-01), Shiomi et al.

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