Light leakage preventing device for focal plane shutters

Details Light leakage preventing device for focal plane shutters Light leakage preventing device for focal plane shutters

1977-11-28

1979-02-27

Griffin, Donald A.

354219, 354246, G03B 1912, G03B 1302, G03B 940

Patent

active

041416341

ABSTRACT:
A light leakage preventing device for focal plane shutters made by interposing a shielding member between a view finder optical system and shutter base plates to intercept a light reaching a film surface through an air gap defined by the shutter base plates from within the view finder optical system. Said shielding member is moved from a light intercepting position to a non-light intercepting position by an interlocking lever operated between the operation of a release button of a photographic camera and the beginning of the operation of shutter blades and is moved from the non-light intercepting position to the light intercepting position simultaneously with the introduction of a light into the view finder optical system from an object to be photographed.

REFERENCES:
patent: 3094913 (1963-06-01), Morelle
patent: 3411422 (1968-11-01), Sauer
patent: 3821768 (1974-06-01), Urano et al.
patent: 3999196 (1976-12-01), Inoue

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