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US 4,908,718 AGranted
Image reading apparatus having a light shielding layer arranged on the sides of the substrate and protective layers of a photo sensor
AssigneeCanon Kabushiki Kaisha
InventorTetsuya Shimada
Life of this patent
Estimating the term…
Abstract
A photosensor for an image reading apparatus includes a light-transmissive substrate, a light shielding layer arranged on a portion of the surface of the substrate, and a photosensor formed over the light shielding layer. Protective layers are arranged on the surface of the photosensor. Light shielding structure is provided on the sides of the substrate and/or the sides of the protective layers to prevent stray light from entering the side of the photosensor.
Claims37
A photo sensor for an image reading apparatus, comprising:
- a light-transmissive substrate;
- a light shielding layer arranged on a portion of a surface of said substrate;
- an insulative layer arranged on said light shielding layer;
- a photoconductive semiconductor layer arranged on said insulative layer;
- protective layers arranged on said photoconductive semiconductor layer, wherein light irradiated through a back side of the substrate is reflected from an original and received by said photoconductive semiconductor layer, thereby reading image information;
- and
- light shielding means provided on the sides of the substrate and on the sides of the protective layers.
4 more elements
A photo sensor for an image reading apparatus, comprising:
- a light-transmissive substrate;
- a light shielding layer arranged on a surface of said substrate;
- a photo sensor formed over said light shielding layer;
- protective layers arranged on said photo sensor;
- and
- light shielding means provided on the sides of said substrate and the sides of said protective layers.
3 more elements
A reading apparatus comprising:
- an image reading apparatus having a light transmissive substrate, (b) a light shielding layer arranged on a surface of said substrate, (c) a photo sensor formed over said light shielding layer, (d) protective layers arranged on said photo sensor, and (e) light shielding means provided on the sides of said substrate and/or said protective layers;
- moving means for relatively moving an original with respect to said reading apparatus such that the original is proximate to or in contact with said protective layers;
- and
- a light source to illuminate the original.
1 more element
Dependencies are inferred from the claim text.