Image reading apparatus and image reading head
AssigneeBrother Kogyo Kabushiki Kaisha
InventorNobuhiko SUZUKI
Life of this patent
Estimating the term…
Abstract
An image reading apparatus having light emitting unit for irradiating light onto a original, reflected light detector light reflected by the original after the original is irradiated by the light emitting unit, outside light detector disposed in an area outside the area in which light reflected by the original enters the reflected light detector and reflected light correcting unit for correcting detection result data detected the reflected light detector based on outside light detected by the outside light detector. An image reading head having light emitting unit, which irradiates, a original with light, and a plurality of light receiving elements arranged in a row having a length longer than a length of the light emitting unit.
Claims13
An image reading apparatus comprising:
- a original placement surface onto which a original is to be placed;
- a light emitting unit which irradiates the original placed on the original placement surface with light;
- a reflected light detector comprising a plurality of light receiving elements arranged along a main scanning direction and which sequentially detect, along a plurality of scanning directions parallel to the main scanning direction, light reflected by the original irradiated by the light emitting unit;
- an outside light detector comprising a light receiving element arranged in at least one of a row the same as a row of the plurality of light receiving elements of the reflected light detector and a row substantially adjacent to the row of the plurality of light receiving elements of the reflected light detector, wherein the outside light detector is disposed in an area outside the area in which light reflected by the original enters the reflected light detector;
- and
- a reflected light correcting unit which corrects detection result data regarding the reflected light detected by the reflected light detector based on detection result data detected by the outside light detector.
An image reading head moved in a sub-scanning direction along a back side surface of a transparent original placement surface onto which a original is to be placed, the head comprising:
- a light emitting unit, which is arranged along a main scanning direction orthogonal to the sub-scanning direction and which irradiates, from the back surface of the original placement surface, a original placed on the original placement surface with light;
- and
- a plurality of light receiving elements arranged in a row along the main scanning direction, the row having a length longer than a length of the light emitting unit.
An image reading apparatus comprising:
- an original placement surface onto which a original is to be placed;
- a reading unit including:
- a light emitting unit which includes a plurality of light emitting elements arranged in a main scanning direction, and
- a light receiving unit which has a length in the main scanning direction longer than that of the light emitting unit and which includes a plurality of first light receiving elements which are arranged along the main scanning direction and are arranged adjacent to the plurality of light emitting elements and at least one second light receiving element which is arranged in alignment with the first light receiving elements and is not arranged adjacent to the plurality of light emitting elements;
- and
- a correcting unit which corrects outputs of the first light receiving elements based on an output of the second light receiving element.
Dependencies are inferred from the claim text.