Patent
1992-04-09
1994-03-22
Gellner, Michael L.
354270, G03B 908, G03B 902
Patent
active
052968855
ABSTRACT:
Aperture correction for a moving aperture shutter comprising a first aperture, a second larger aperture, and a mechanism for causing relative movement between the first and second apertures between an initial position where the first and second apertures are out of registry, through an intermediate position where the first aperture is partially within the second aperture and an exposure position where the first aperture is within the second aperture, and wherein the aperture correction is provided by altering a physical relationship between the first and second apertures so as to minimize the amount of exposure of the second aperture during movement through the intermediate position. The shape and/or size of the second aperture can be altered, the location of the first aperture within the second aperture in the exposure position can be altered, or there can be a combined alteration of aperture shape, size and location. As a result, the foregoing counters the blur circle elongation of the moving aperture shutter.
REFERENCES:
patent: 1663326 (1928-03-01), Wollensak
patent: 2584912 (1952-02-01), Palmer
patent: 2956491 (1960-10-01), Fischer et al.
patent: 2969007 (1961-01-01), Groger
patent: 3033093 (1962-05-01), Stimson et al.
patent: 3033094 (1962-05-01), Stimson et al.
patent: 4209243 (1980-06-01), Johnson et al.
Desormeaux Stephen G. M.
Sangregory Jude A.
Eastman Kodak Company
Gellner Michael L.
Noh Jae N.
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