Analog/digital control arrangement for photographic apparatus

Details Analog/digital control arrangement for photographic apparatus Analog/digital control arrangement for photographic apparatus

1975-06-03

1977-11-15

Adams, Russell E.

354 23D, 354 42, 354 43, 354 60A, G03B 708

Patent

active

040588190

ABSTRACT:
A bridge circuit which includes a photoelectric transducer furnishes input signals to a differential amplifier whose analog output signal varies in correspondence to the bridge unbalance. A first and second bistable threshold circuit changes the analog output signal into digital signals signifying bridge unbalance in a first direction, balance, and unbalance in the opposite direction, a motor is energized to rotate in a direction corresponding to the direction of bridge unbalance. The motor can be utilized to move the objective lens of a slide projector or change the aperture of a diaphragm.

REFERENCES:
patent: 3813680 (1974-05-01), Wagensonner et al.
patent: 3882522 (1975-05-01), Erlichman
patent: 3900855 (1975-08-01), Stempeck
patent: 3903528 (1975-09-01), Kee
patent: 3987462 (1976-10-01), Wagensonner

Affiliated with

Also associated with

Rating

Analog/digital control arrangement for photographic apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Analog/digital control arrangement for photographic apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analog/digital control arrangement for photographic apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1722671