Both-side document reading apparatus and both-side document reading method
AssigneeSharp Kabushiki Kaisha
InventorTakashi Imai
Life of this patent
Estimating the term…
Abstract
First and second scanning and reading systems are arranged on the both sides of the document transport path. The image reading region by the first scanning and reading system is positioned on an upstream side of an image reading region by the second scanning and reading system. The document images on the surfaces are read while illuminating with light from light sources of the scanning and reading systems the main and back surfaces of the document being transported on the document transport path. Until the document image reading by the second scanning and reading system is ended, the light amount of the light source of the first scanning and reading system is maintained constant thereby preventing the reception-light amount in the second scanning and reading system from changing.
Claims18
A both-side document reading apparatus for reading images of one side surface and another side surface of a document transported from a document tray and moving, by emitting light toward the one side surface of the document in moving state by a first light source and by emitting light toward the other side surface of the document in moving state by a second light source, comprising:
- a first reading portion, disposed in a region for reading the one side surface of the document and provided with the first light source, for reading an image of the one side surface of the document;
- and
- a second reading portion, disposed in a region for reading the other side surface of the document and provided with the second light source, for reading an image of the other side surface of the document,
- wherein the light source of one of the first reading portion and the second reading portion which is disposed on a downstream side in the document transport direction is driven into a lighting state, after the light source of the other of the first reading portion and the second reading portion which is disposed on an upstream side in the document transport direction is driven into a lighting state, and before the document image reading is started by the other of the first reading portion and the second reading portion which is disposed on the upstream side in the document transport direction, and
- wherein the first light source and the second light source are turned off after the completion of reading of the transported document by the one of the first-reading portion and the second reading portion which is disposed on the downstream side in the document transport direction.
An image forming apparatus comprising a both-side document reading apparatus for reading images of one side surface and another side surface of a document transported from a document tray and moving, by emitting light toward the one side surface of the document in moving state by a first light source and by emitting light toward the other side surface of the document in moving state by a second light source,
- the both-side document reading apparatus comprising:
- a first reading portion, disposed in a region for reading the one side surface of the document and provided with the first light source, for reading an image of the one side surface of the document;
- and
- a second reading portion, disposed in a region for reading the other side surface of the document and provided with the second light source, for reading an image of the other side surface of the document,
- wherein the light source of one of the first reading portion and the second reading portion which is disposed on a downstream side in the document transport direction is driven into a lighting state, after the light source of the other of the first reading portion and the second reading portion which is disposed on an upstream side in the document transport direction is driven into a lighting state, and before the document image reading is started by the other of the first reading portion and the second reading portion which is disposed on the upstream side in the document transport direction, and
- wherein the first light source and the second light source are turned off after the completion of reading of the transported document by the one of the first reading portion and the second reading portion which is disposed on the downstream side in the document transport direction.
A both-side document reading apparatus comprising:
- a first reading portion. provided with a first light source, for reading one side surface of a document by emitting light toward the one side surface of the document by the first light source;
- and
- a second reading portion, provided with a second tight source, for reading another side surface of the document by emitting light toward the other side surface of the document by the second light source,
- wherein the first and second reading portions are arranged so that a reading region of the one side surface by the first reading portion is arranged on an upstream side from a reading region of the other side surface by the second reading portion in a document transport direction, and
- wherein the first light source is turned off after the document has passed through the reading region of the second reading portion.
An image forming apparatus comprising a both-side document reading apparatus,
- the both-side document reading apparatus comprising:
- a first reading portion, provided with a first light source, for reading one side surface of a document by emitting light toward the one side surface of the document by the first light source;
- and
- a second reading portion, provided with a second light source, for reading another side surface of the document by emitting light toward the other side surface of the document by the second light source,
- wherein the first and second reading portions are arranged so that a reading region of the one side surface by the first reading portion is arranged on an upstream side from a reading region of the other side surface by the second reading portion in a document transport direction, and
- wherein the first light source is turned off after the document has passed through the reading region of the second reading portion.
Dependencies are inferred from the claim text.