Scanning apparatus with means to control the frequency of vibrat

Details Scanning apparatus with means to control the frequency of vibrat Scanning apparatus with means to control the frequency of vibrat

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

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