Exposure time control device for camera

Details Exposure time control device for camera Exposure time control device for camera

1981-12-16

1983-12-27

Adams, Russell E.

3542381, 3542341, G03B 962

Patent

active

044227477

ABSTRACT:
In the exposure time control device disclosed, a first timer sets a first time interval equal to a desired exposure time but establishes an exposure time in the shutter different from the desired exposure time. A second timing arrangement forms a compensation time interval. Suitable means maintain the opening of the shutter for a total time equal to the given time interval and the compensation time interval so that the shutter is open for the desired exposure time. A control shortens the given time interval formed by the first timing arrangement by a predetermined time interval so that the given time interval formed is shorter than the desired exposure time. This permits compensation not only for errors which tend to shorten the exposure time, but also those which tend to lengthen the exposure time.

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

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