1983-05-09
1985-01-15
Mathews, A. A.
354250, 354252, G03B 940
Patent
active
044935447
ABSTRACT:
A focal-plane shutter for a camera comprises a pair of apertured base plates disposed parallel to each other with a predetermined spacing therebetween to form an aperture for exposure, and light-shielding blades mounted between the base plates at a normal position outwardly of one side of the aperture, the blades being adapted to move into the aperture to close the same while being guided by the surfaces of the base plates, the motion of the blades being terminated when part of the blades has moved past the opposite side of the aperture. The shutter further comprises a recess formed in the internal face of at least one of the base plates, the recess being of a dimension sufficient to receive part of a blade on the termination of motion and to provide larger spacing of the base plates at a position beyond the opposite side of the aperture.
REFERENCES:
patent: 3847476 (1974-11-01), Onda et al.
patent: 3903539 (1975-09-01), Kitai et al.
patent: 4141634 (1979-02-01), Inoue
patent: 4231650 (1980-11-01), Saito et al.
patent: 4302091 (1981-11-01), Harase et al.
Mathews A. A.
Nippon Kogaku K.K.
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