Shutter abnormality detection apparatus for camera

Details Shutter abnormality detection apparatus for camera Shutter abnormality detection apparatus for camera

2005-03-22

2005-03-22

Gray, David M. (Department: 2851)

Photography

Exposure control circuit

Velocity control of shutter or diaphragm component

C396S479000

Reexamination Certificate

active

06871019

ABSTRACT:
A shutter abnormality detection apparatus for a camera includes a shutter including leading and trailing curtains which are shutter curtains electrically controlled to run. A curtain run detection unit detects a run state of at least one of the leading and trailing curtains. A curtain run time judgment unit judges a run time of the shutter curtains based on an output from the curtain run detection unit. An abnormality processing unit notifies an abnormality state of the shutter curtains, when it is judged as a result of judgment in the curtain run time judgment unit that the curtain run time is abnormal.

REFERENCES:
patent: 5257056 (1993-10-01), Kazumi
patent: 5457514 (1995-10-01), Hasuda et al.
patent: 5758213 (1998-05-01), Goto et al.
patent: 5835800 (1998-11-01), Goto et al.

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