Program shutter drive system

Details Program shutter drive system Program shutter drive system

1989-03-29

1991-01-29

Adams, Russell E.

3542711, G03B 708

Patent

active

049890301

ABSTRACT:
A program shutter drive system has an ultrasonic motor for controlling an opening size of a shutter according to a programmed schedule of operation according to a brightness of a subject to be photographed. The ultrasonic motor drives the shutter to open and close according to a proper exposure determined for a subject based on a brightness of the subject by an exposure determining device. A control signal generator provides a position indicating signal and a speed indicating signal which are determined to perform a programmed schedule of operation of the shutter according to the proper exposure output. A detector is provided to output an actual position signal representing an actual opening of the shutter and an actual speed signal representing an actual speed at which the shutter opens to the actual opening size. The position and speed indicating signals are compared with the actual position and speed signals, respectively, so as to control rotation of the ultrasonic motor.

REFERENCES:
patent: 4354748 (1982-10-01), Grimes et al.
patent: 4572645 (1986-02-01), Yoshida et al.
patent: 4664494 (1987-05-01), Hughes et al.
patent: 4839680 (1989-06-01), Amada et al.

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