Light interrupter

Details Light interrupter Light interrupter

1975-01-21

1977-07-05

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

350269, 354234, 354236, 354261, G03B 2776, G03B 920

Patent

active

040336930

ABSTRACT:
An optical apparatus in which a beam of light is caused to travel along a predetermined direction is provided with a light interrupter for interrupting the beam. The light interrupter includes a light-interrupting component, such as a shutter blade or color filter, and a driving coil connected to the light-interrupting component. The light-interrupting component and driving coil are mounted for pivotal movement about an axis substantially parallel to the beam direction, with the light-interrupting component moving between a light blocking position and an unblocking position. A control circuit is connected to the driving coil for effecting energization of the coil. A magnet arrangement is so positioned as to establish a magnetic field through which the driving coil moves when the driving coil pivots around the pivot axis, with the magnetic field being oriented substantially perpendicular to the direction of movement of the driving coil.

REFERENCES:
patent: 2390216 (1945-12-01), Guedon
patent: 2702500 (1955-02-01), DeBell
patent: 3088388 (1963-05-01), Tredopp
patent: 3272106 (1966-09-01), Czekalla
patent: 3281592 (1966-10-01), Dixon
patent: 3654845 (1972-04-01), Fahlenberg et al.
patent: 3687042 (1972-08-01), Mizui et al.

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