Automatic-exposure control device for optical instruments

Details Automatic-exposure control device for optical instruments Automatic-exposure control device for optical instruments

1975-10-17

1978-07-11

Adams, Russell E.

Optics: motion pictures

Removable film strip magazine type

354 44, 352141, G03B 902

Patent

active

041005589

ABSTRACT:
Herein disclosed is an electromagnetic rotary motion device including permanent magnets establishing a pair of spaced concentric and coextensive circular or semicircular air gaps and a rotor unit including armatures which are movable in a circular path in and along the spaced air gaps in response to an electric control signal impressed thereon. A typical application of the rotary motion device is a diaphragm-assisted exposure control arrangement of an optical instrument, such as for example as a still camera, a cinema motion camera or a television camera, wherein the diaphragm is driven by the rotor unit for providing a degree of exposure which is optimum for the brightness of an object to be photographed or televised.

REFERENCES:
patent: 3654845 (1972-04-01), Fahlenberg et al.
patent: 3687042 (1972-08-01), Mizui et al.
patent: 3776111 (1973-12-01), Maida

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