Exposure time indicating device for camera shutter

Details Exposure time indicating device for camera shutter Exposure time indicating device for camera shutter

1975-05-13

1976-10-26

Peters, Jr., Joseph F.

354 60R, G03B 708

Patent

active

039887502

ABSTRACT:
An exposure time indicating apparatus for a camera shutter having a switching circuit that has a switching level which is compensated for the brightness of an object or field of exposure. The apparatus includes an indicating circuit that indicates the exposure time. The signal developed to indicate the exposure time takes into consideration exposure factors other then the delay for variaions in brightness, for control of exposure time. This other factor is introduced by camera adjustments which effect automatically adjustment of a variable resistor as a function of the exposure factor being adjusted and this resistor varies a bias voltage on a transistor of a differential amplifier for varying the output thereof to apply a variation to a switching circuit controlling the shutter to change its switching level and the switching signal closing the shutter. This varied and time-delayed signal is visually indicated in a meter as the actual exposure time before the taking of an exposure.

REFERENCES:
patent: 3651744 (1972-03-01), Okada
patent: 3675548 (1972-07-01), Kikuchi et al.
patent: 3750540 (1973-08-01), Yanagisawa et al.

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