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US 7,715,066 B2Granted
Document reading apparatus, image processing apparatus, image forming apparatus, and copying machine
AssigneeRicoh Company, Ltd.
InventorNorio Michiie
Life of this patent
Estimating the term…
Abstract
An opening detector detects a state of a platen whether the platen is “opened” at a level equal to or above a set opening degree or “closed” at a level less than the set opening degree. A reading controller starts lighting of an illumination lamp in response to a change of the state of the platen from the “opened” to the “closed”. A rising detector detects a rising of light intensity of the illumination lamp. A size detector reads an image signal of an imaging element after the rising detector detects a rising of the light intensity, determines presence of a document in a main scanning direction, and decides a document size in the main scanning direction.
Claims25
A document reading apparatus comprising:
- a translucent plate;
- a platen that presses a document against the translucent plate;
- an illumination lamp that illuminates the document;
- a driving unit that drives the illumination lamp in a sub-scanning direction;
- an imaging element that reads the document in a main scanning direction, and line-outputs an image signal;
- an optical unit that projects a document image illuminated by the illumination lamp to the imaging element;
- an opening detector that detects a state of the platen whether the platen is “opened” at a level equal to or above a set opening degree or “closed” at a level less than the set opening degree;
- a reading controller that starts lighting of the illumination lamp in response to a change of the state of the platen from the “opened” to the “closed”;
- a rising detector that detects a rising of light intensity of the illumination lamp;
- and
- a size detector that reads the image signal of the imaging element after the rising detector detects a rising of the light intensity, determines a presence of the document in the main scanning direction, and decides a document size in the main scanning direction.
8 more elements
An image processing apparatus comprising:
- an image reading device including
- a translucent plate;
- a platen that presses a document against the translucent plate;
- an illumination lamp that illuminates the document;
- a driving unit that drives the illumination lamp in a sub-scanning direction;
- an imaging element that reads the document in a main scanning direction, and line-outputs an image signal;
- an optical unit that projects a document image illuminated by the illumination lamp to the imaging element;
- an opening detector that detects a state of the platen whether the platen is “opened” at a level equal to or above a set opening degree or “closed” at a level less than the set opening degree;
- a reading controller that starts lighting of the illumination lamp in response to a change of the state of the platen from the “opened” to the “closed”;
- a rising detector that detects a rising of light intensity of the illumination lamp;
- and
- a size detector that reads the image signal of the imaging element after the rising detector detects the rising of the light intensity, determines a presence of the document in the main scanning direction, and decides a document size in the main scanning direction;
- a memory unit that stores image data;
- and
- an image data processor that stores the image data output from the image reading device into the memory unit, and reads the image data from the memory unit.
12 more elements
An image forming apparatus comprising:
- an image reading device including
- a translucent plate;
- a platen that presses a document against the translucent plate;
- an illumination lamp that illuminates the document;
- a driving unit that drives the illumination lamp in a sub-scanning direction;
- an imaging element that reads the document in a main scanning direction, and line-outputs an image signal;
- an optical unit that projects a document image illuminated by the illumination lamp to the imaging element;
- an opening detector that detects a state of the platen whether the platen is “opened” at a level equal to or above a set opening degree or “closed” at a level less than the set opening degree;
- a reading controller that starts lighting of the illumination lamp in response to a change of the state of the platen from the “opened” to the “closed”;
- a rising detector that detects a rising of light intensity of the illumination lamp;
- and
- a size detector that reads the image signal of the imaging element after the rising detector detects the rising of the light intensity, determines a presence of the document in the main scanning direction, and decides a document size in the main scanning direction;
- and
- a printer that prints an image formed by image data read by the image reading apparatus on a recording medium.
11 more elements
Dependencies are inferred from the claim text.