Exposure time control device of electric shutter for camera

Details Exposure time control device of electric shutter for camera Exposure time control device of electric shutter for camera

1974-08-23

1976-12-21

Adams, Jr., Russell E.

354 50, 354 51, 354 60A, G03B 708

Patent

active

039991911

ABSTRACT:
An electronic camera shutter control circuit having a reversible counter for counting a number of pulses proportional to the duration of an exposure time. When the camera shutter is opened pulses are subtracted from the memory content of the reversible counter until the counter content is zero and the exposure is terminated. The reversible counter includes a final stage which does not change state if the number of pulses applied to the counter exceeds the memory capacity of the counter. For this condition the exposure time is first controlled by the charging time of a capacitor until a voltage stored in the capacitor exceeds a certain value whereupon the memory content of the counter is subtracted until it is zero and the exposure is terminated.

REFERENCES:
patent: 3748979 (1973-07-01), Wada
patent: 3824608 (1974-07-01), Toyoda
patent: 3827065 (1974-07-01), Wada
patent: 3836262 (1974-09-01), Yata et al.
patent: 3843265 (1974-10-01), Egli et al.

Affiliated with

Also associated with

Rating

Exposure time control device of electric shutter for camera does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exposure time control device of electric shutter for camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exposure time control device of electric shutter for camera will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1842409