Blade type focal plane shutter

Details Blade type focal plane shutter Blade type focal plane shutter

Filed on

1981-04-29

Date issued

1982-08-31

Examiner

Gonzales, John

Other Related Categories

G03B 940

Type

Patent

Status

active

Patent number

043469779

Description

ABSTRACT:
A blade type focal plane shutter comprising a main arm, an auxiliary arm pin-slot-connected to the main arm, a main opaque lamina for forming an exposure slit pivoted on the main arm and pin-slot-connected to the auxiliary arm, and a plurality of auxiliary opaque laminae for covering an exposure aperture rotatably supported by a common shaft and pin-slot-connected to the main arm wherein the main lamina is made of material high in mechanical strength such as steel and the auxiliary laminae are made of such comparatively light material as plastics, aluminum, titanium, beryllium or a composite of them, to make the shutter small and to reduce the weight of the entire shutter blade assembly. Among the plurality of auxiliary laminae, one lamina to be used to support the main lamina is made of a material high in mechanical strength.

REFERENCES:
patent: 3903539 (1975-09-01), Kitai et al.
patent: 4009946 (1977-03-01), Geyer et al.

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