Camera having a shutter measuring apparatus

Details Camera having a shutter measuring apparatus Camera having a shutter measuring apparatus

1994-01-07

1998-05-26

Gray, David M.

Photography

Exposure control circuit

Velocity control of shutter or diaphragm component

396452, 396463, G03B 908

Patent

active

057582130

ABSTRACT:
A shutter of a camera is provided with a shutter trip detecting device includes LEDs and PTRs. Measured are tripping timings of leading and trailing curtains for admitting and intercepting object light to an aperture. An exposure time on a film and a tripping time (curtain velocity) of each curtain are thus detected. The detected result is compared with a fiducial value, and an alarm is given according to the need. There are detected mechanical fluctuation elements relative to the shutter, e.g., a scatter of the exposure time on the film, a partial uneveness of the exposure time and an influence on the exposure time due to a fault in a driving mechanism. The alarm can be thus given to the user, and an automatic adjustment can be made. The shutter trip detecting device includes the shutter leading/trailing curtains, the LEDs and PTRs which detect tripping thereof.

REFERENCES:
patent: 4325614 (1982-04-01), Grimes
patent: 5014082 (1991-05-01), Farrington
patent: 5457514 (1995-10-01), Hasuda et al.

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