Photographic curtain-type shutter with electromagnetic actuation

Details Photographic curtain-type shutter with electromagnetic actuation Photographic curtain-type shutter with electromagnetic actuation

1978-03-28

1980-08-05

Gonzales, John

354244, G03B 934

Patent

active

042159253

ABSTRACT:
A focal plane shutter adapted for use in a single lens reflex camera and having front and rear curtains with respective charge control gears to be operated in engagement with each other during the winding process. At the terminal end of one cycle of winding operation, these gears are released from positive connection with a film winding mechanism, while the front and rear curtains are held in their cocked positions by separate latches in at least a time interval between a moment at which the diaphragm starts to move and a moment at which the mirror flips out of way to actuate release of the front curtain, thereby an electromagnetic release control for the rear curtain latch is prevented from being disturbed as by a shock which would be otherwise exerted on the rear curtain latch at the start of movement of the front curtain.

REFERENCES:
patent: 4109265 (1978-08-01), Hashimoto

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