1988-01-21
1989-01-10
Mathews, A. A.
354249, 354250, G03B 940
Patent
active
047976993
ABSTRACT:
A focal plane shutter for a camera comprising two sets of parallel blades positioned between the plane of a lens in the camera and the plane of a film set therein and in a parallel relation thereto. These sets of blades are movable in opposite directions between a first position in which they are unfolded to close a shutter aperture and a second position in which they are folded to form a slit to open the shutter aperture. Every two adjoining blades in each set of blades has a smaller overlapping width in their first position than in their second position. This overlapping width in the first position is smaller between two adjoining blades closer to the lens plane than between two adjoining blades closer to the film plane.
REFERENCES:
patent: 3864713 (1975-02-01), Kitai et al.
patent: 4081810 (1978-03-01), Onda et al.
patent: 4493544 (1985-01-01), Uematsu
patent: 4560265 (1985-12-01), Hashimoto
patent: 4657366 (1987-04-01), Tanabe et al.
Aosaki Ko
Misawa Atsushi
Nemoto Ichiro
Otora Takahito
Adams Bruce L.
Mathews A. A.
Seikosha Co. Ltd.
Wilks Van C.
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