Shutter mechanism drive having reduced mechanical noise

Details Shutter mechanism drive having reduced mechanical noise Shutter mechanism drive having reduced mechanical noise

1989-10-27

1990-11-20

Gellner, Michael L.

354247, 354437, G03B 7097, G03B 914

Patent

active

049722174

ABSTRACT:
A shutter mechanism actuated by a plunger type solenoid in an exposure control system for a reflex camera is provided with a solenoid drive control for reducing the subject-distracting mechanical noise that is normally generated when the solenoid plunger is driven into its fully retracted position in order to close shutter blades forming a portion of the shutter mechanism, immediately prior to an exposure interval. The solenoid drive control comprises a microcontroller and a blade encoder to indicate the degree of blade closure. Blade closure signals are routed to the microcontroller that, in response thereto, causes a reduction in the amount of solenoid actuating current delivered to the solenoid to thereby reduce the amount of solenoid drive and therefore the amount of mechanical noise that is generated when the solenoid plunger is driven into the fully retracted position.

REFERENCES:
patent: 3415644 (1968-12-01), Land
patent: 3672281 (1972-06-01), Land
patent: 3753392 (1973-08-01), Land
patent: 3942183 (1976-03-01), Whiteside

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