Brake device for focal plane shutter

Details Brake device for focal plane shutter Brake device for focal plane shutter

1992-07-30

1994-05-24

Gellner, Michael L.

G03B 940

Patent

active

053153359

ABSTRACT:
A focal plane shutter comprising a front blade braking lever functioning to press a front blade actuating lever to a rotating shaft thereof by utilizing resilience of a front blade actuating spring at a final stage of an exposure operation performed by the front blade actuating lever and a rear blade braking lever functioning to press a rear blade actuating lever to a rotating shaft thereof by utilizing resilience of a rear blade actuating spring at a final stage of an exposure operation performed by the rear blade actuating lever. This focal plane shutter is simple in structure thereof, capable of controlling exposure of film with high accuracy and maintaining initial performance thereof for a long term, and can be manufactured at a low cost.

REFERENCES:
patent: 4829329 (1989-05-01), Toyoda et al.
patent: 4975722 (1990-12-01), Suzuki et al.

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