Light measuring apparatus

Details Light measuring apparatus Light measuring apparatus

1975-03-06

1976-08-24

Adams, Jr., Russell E.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354 50, 354 51, 354 60R, 356223, G03B 708

Patent

active

039770117

ABSTRACT:
An automatic exposure control system for regulating one or more variable photographic parameters. The light level of a scene is evaluated using a photosensitive voltage source. A differential amplifier with a non-linear negative feedback is provided to allow one or more inexpensive linear potentiometers to be used to enter the aperture value and film sensitivity information into the system. Based on these parameters, the system automatically controls the camera shutter speed.

REFERENCES:
patent: 3430053 (1969-02-01), Westhaver
patent: 3441835 (1969-04-01), Hekrdle
patent: 3620143 (1971-11-01), Burgarella
patent: 3690230 (1972-09-01), Mori et al.

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