Analog/digital control arrangement for photographic apparatus

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

1974-12-30

1976-08-03

Aegerter, Richard E.

Optics: image projectors

Lens support

Lens position adjustable

352141, 354 23D, 354 44, G03B 310, G03B 710

Patent

active

039726070

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: 3249001 (1966-05-01), Stauffer
patent: 3430053 (1969-02-01), Westhaver

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