Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1995-12-28
1997-06-24
Royer, William J.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 52, 355 53, 355 75, G03B 2752, G03B 2742, G03B 2762, H04N 104
Patent
active
056421826
ABSTRACT:
A scanning apparatus includes a sheet holder for holding a sheet to be scanned in the shape of a segment of a cylinder, a light source for irradiating the sheet with light, a spinner including a converging lens for converging light from the light source on the surface of the sheet, and a light detector for photoelectrically detecting light from the sheet, a spindle motor including a plurality of rolling balls in a bearing for rotating the spinner coaxially with a center axis of the cylinder, and a sub-scanning device for moving the sheet holder relative to the spinner in a direction parallel to the center axis, and the rolling balls are provided so that the vibrational frequency F of the bearing satisfies the formula Fb/6.ltoreq..vertline.F-n1.times.Fb.vertline..ltoreq.Fb/2 wherein Fb is the rotational frequency of the spindle motor and n1 is a positive integer. According to the thus constituted scanning apparatus, it is possible to read an image which contain no visibly recognizable wave-like unevenness even when the image is read at high density at a reduced scanning pitch.
REFERENCES:
patent: 4293184 (1981-10-01), Minoura et al.
patent: 4298271 (1981-11-01), Sugiura et al.
patent: 4835386 (1989-05-01), Shimura et al.
patent: 5309198 (1994-05-01), Nakagawa
patent: 5583663 (1996-12-01), Boeve
Nishioka Yukinori
Ogura Nobuhiko
Fuji Photo Film Co. , Ltd.
Kerner Herbert V.
Royer William J.
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