Shutter time control circuit

Details Shutter time control circuit Shutter time control circuit

1981-10-07

1983-07-26

Adams, Russell E.

354 50, G03B 708

Patent

active

043950981

ABSTRACT:
The present invention relates to a shutter time control circuit for a camera having a focal plane shutter and a timer circuit for counting the shutter time in a digital way. In accordance with the present invention a preset means for presetting the amount of the overlapping of the shutter curtain and/or the response delay of the magnet on the timer circuit as digital values is provided in such a manner that the clock time is compensated in accordance with the preset digital value so as to compensate the exposure error due to the overlapping amount of the shutter curtains and so on, which makes it possible to offer a digital exposure compensation device suited for the camera having a shutter control circuit for digitally controlling the shutter time.

REFERENCES:
patent: 3683767 (1972-08-01), Sahara
patent: 4034383 (1977-07-01), Mashimo et al.

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