Braking device for shutter

Details Braking device for shutter Braking device for shutter

1985-09-18

1987-09-08

Perkey, W. B.

G03B 940

Patent

active

046920099

ABSTRACT:
The present invention relates to a braking device for a focal plane shutter in a camera. In the early stage of a braking operation on a shutter curtain, a relatively weak braking force is applied, and in the closing stage of the braking operation, a strong braking force is applied to insure that without causing the shutter curtain to bounce or to be damaged by shock, the shutter curtain is stopped. The device is constructed from two brake members arranged so that in the early stage the first brake member takes action, and in the closing stage, the second brake member takes action to add a braking force to that of the first brake member.

REFERENCES:
patent: 4109266 (1978-08-01), Inoue
patent: 4110773 (1978-08-01), Scholz
patent: 4302091 (1981-11-01), Harase et al.
patent: 4316662 (1982-02-01), Tosaka et al.

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