Planar light source and image reading device

Details Planar light source and image reading device Planar light source and image reading device

1996-02-13

1998-07-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358461, 358509, 358487, 355 67, 362 26, 362 31, H04N 104, H04N 140, H04N 146, G03B 2754

Patent

active

057813116

ABSTRACT:
An image reading device includes a planar light source having sufficiently even illumination to allow accurate shading correction to be performed regardless of the position in the auxiliary scanning direction. The image reading device includes a light source, a photoelectric conversion device, a movement device and a computer. The planar light source includes a rod-shaped light-emitting device and a light-guiding plate that receives light from the rod-shaped light-emitting device and emits light from a single surface. The rod-shaped light-emitting device is at least along one lengthwise side of the light-guiding plate. The photoelectric conversion device converts the image into an electrical image signal which is processed by the computer. The movement device moves the photoelectric conversion device in the auxiliary scanning direction, which is substantially perpendicular to the longer lengthwise side of the photoelectric conversion device and substantially perpendicular to the longer lengthwise side of the rod-shaped light-emitting device.

REFERENCES:
patent: 4729067 (1988-03-01), Ohe
patent: 4870501 (1989-09-01), Yoshida
patent: 5038277 (1991-08-01), Koshiyouji et al.
patent: 5178447 (1993-01-01), Murase et al.

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