US 5,333,066 AGranted

Image reading apparatus

AssigneeDainippon Screen Mfg. Co., Ltd.

InventorTakeshi Sugata

Life of this patent

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Abstract

A scanner scans an original 6 divided into a plurality of regions in a main scanning direction reading image information. The scanner is equipped with light receiving units consisting of a plurality of CCDs arranged in the main scanning direction having a corresponding array of pixels that respond to an image of the original focused on the surface of the array by a plurality of lenses 12 arranged in the main scanning direction. A focal length f of the lens 12 satisfies the following formula, that is, f.gtoreq.(L.sub.n .times.y-n).times.P.times.L.sub.n .times..DELTA./{n.times. (1+P.times.L.sub.n)} where L.sub.n is the number of lines to be read, y is a length from an optic axis to the end of the region, P is a pitch between the solid-state imaging devices, n is allowable displacement in pixel number on the solid-state imaging devices, and .DELTA. is displacement of the original 6 in the direction of the optic axis OA.

Claims20

Dependent claims

An image reading apparatus for reading image information by scanning an original divided into a plurality of regions in a main scanning direction, comprising:

an original retainer for retaining said original;
a light source for irradiating said original with light;
a plurality of solid-state imaging devices corresponding to pixels and arranged in said main scanning direction;
and
a plurality of lenses arranged in said main scanning direction corresponding to said plurality of regions, for forming an image of the original on said solid-state imaging devices, and with a focal length f of said lens satisfying the following formula, that is,
f.gtoreq.(L.sub.n .times.y-n).times.P.times.L.sub.n .times..DELTA./{n.times.(1+P.times.L.sub.n)}
where L.sub.n is the number of lines to be read, y is a length from an optic axis to the end of said region, P is a pitch between said solid-state imaging devices, n is allowable displacement in pixel number on said solid-state imaging devices, and .DELTA. is displacement of said original in the direction of the optic axis.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/117,898Filed 7 Sep 1993
Priority: JP 4-24341111 Sep 1992
Granted: 26 Jul 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04N 1/1934
Using electrically scanned linear arrays , e.g. linear CCD arrays: combination of arrays
H04N 1/1008
Using flat picture-bearing surfaces: with sub-scanning by translatory movement of the picture-bearing surface
H04N 1/193
Simultaneously or substantially simultaneously scanning picture elements on one main scanning line: using electrically scanned linear arrays ,…
H04N 1/1935
Using electrically scanned linear arrays , e.g. linear CCD arrays: optical means for mapping the whole or part of a scanned line onto the array