Exposure-time control system having a closed-loop circuit arrang

Details Exposure-time control system having a closed-loop circuit arrang Exposure-time control system having a closed-loop circuit arrang

1976-05-06

1978-03-21

Adams, Russell E.

354 24, 354 50, 354 60A, 354 60L, G03B 708

Patent

active

040806103

ABSTRACT:
A closed-loop circuit arrangement sequentially operates in a tracking mode before the shutter of a single lens reflex camera is actuated, and then in a holding mode after the shutter is actuated. The circuit arrangement receives from a conventional photoelectric circuit a first analog signal that instantaneously represents exposure time so long as light entering the camera impinges on the photoelectric circuit. A register in the circuit arrangement provides a digital multi-bit signal that is converted to a second analog signal. The first and second analog signals are compared to produce an error signal used during the tracking mode in controlling the register so that the digital multi-bit signal varies until the first and second analog signals represent the same exposure time. After the shutter is actuated, the register serves as a memory thereby causing the second analog signal to statically represent exposure time.

REFERENCES:
patent: 3899788 (1975-08-01), Toyoda
patent: 3988069 (1976-10-01), Kitavra
patent: 3995284 (1976-11-01), Kitavra et al.

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