Electromagnetically driven diaphragm device

Details Electromagnetically driven diaphragm device Electromagnetically driven diaphragm device

1980-09-16

1983-01-11

Rubinson, G. Z.

Optics: motion pictures

Removable film strip magazine type

354 44, 354271, 352141, 335223, G03B 7095, G03B 907

Patent

active

043679315

ABSTRACT:
In the disclosed diaphragm device, an electromagnetic unit is composed of two opposing sets of circularly arranged magnets poled so that opposing surfaces have the same polarity, a rotary member carrying an electromagnetic coil that moves the rotary member in response to current therethrough and the field of the magnets, and diaphragm blades which are positioned between the magnet members and the rotary member and pivoted to close the aperture in response to rotation of the rotary member in one direction. When the rotary member is rotating in the closing direction, stopping means respond to an input signal and stop movement of the diaphragm blades at a particular aperture value.

REFERENCES:
patent: 4100558 (1978-07-01), Koike et al.
patent: 4210393 (1980-07-01), Ishiguro et al.

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