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US 8,559,072 B2Granted
Image reading apparatus and linear light source unit
AssigneeFuji Xerox Co., Ltd.
InventorHideo Takeuchi
Life of this patent
Estimating the term…
Abstract
An image reading apparatus includes: a light emitting element array that includes plural light emitting elements arranged in line in a first scan direction of a document; a guiding unit that guides light entering from the light emitting element array, and that emits the light toward a reading position of the document while diffusing the light; a light receiving unit that receives reflected light from the reading position irradiated with the light from the light emitting element array through the guiding unit; and a scan unit that moves the reading position of the document in a second scan direction, the reading position being a position read by the light receiving unit.
Claims8
An image reading apparatus comprising:
- a light emitting element array that includes a plurality of light emitting elements arranged in line in a first scan direction of a document;
- a guiding unit that guides light entering from the light emitting element array, and that emits the light toward a reading position of the document while diffusing the light;
- a light receiving unit that receives reflected light from the reading position irradiated with the light from the light emitting element array through the guiding unit;
- and
- a scan unit that moves the reading position of the document in a second scan direction, the reading position being a position read by the light receiving unit,
- wherein
- the guiding unit includes an input face for receiving the light from the light emitting element array, and an output face for emitting the light,
- a length in the first scan direction of the output face is set larger than a length of the document located at the reading position, and positions of edges in the first scan direction of the output face are located outside respective positions of edges in the first scan direction of the document,
- a length in the first scan direction of the input face is set smaller than the length in the first scan direction of the output face, and positions of edges in the first scan direction of the input face are located inside the respective positions of edges in the first scan direction of the output face;
- and the length in the first scan direction of the input face is set larger than a length of the light emitting element array, and positions of edges in the first scan direction of the light emitting element array are located inside the respective positions of edges in the first scan direction of the input face, and
- the output face has asperities that are formed at an interval smaller than an interval at which the plurality of light emitting elements are arranged in the light emitting element array.
8 more elements
A linear light source unit comprising:
- a light emitting element array that includes a plurality of light emitting elements arranged in line;
- and
- a guiding unit including:
- an input face that is formed along the light emitting element array so as to face the light emitting element array and that receives light from the light emitting element array;
- and an output face that is formed so as to face the input face and that emits the light entering through the input face while diffusing the light,
- wherein
- the guiding unit includes an input face for receiving the light from the light emitting element array, and an output face for emitting the light,
- a length in the first scan direction of the output face is set larger than a length of the document located at the reading position, and positions of edges in the first scan direction of the output face are located outside respective positions of edges in the first scan direction of the document,
- a length in the first scan direction of the input face is set smaller than the length in the first scan direction of the output face, and positions of edges in the first scan direction of the input face are located inside the respective positions of edges in the first scan direction of the output face;
- and the length in the first scan direction of the input face is set larger than a length of the light emitting element array, and positions of edges in the first scan direction of the light emitting element array are located inside the respective positions of edges in the first scan direction of the input face, and
- the output face has asperities that are formed at an interval smaller than an interval at which the plurality of light emitting elements are arranged in the light emitting element array.
8 more elements
Dependencies are inferred from the claim text.