Image reading apparatus
AssigneeCanon Kabushiki Kaisha
InventorTakayuki Suga
Life of this patent
Estimating the term…
Abstract
An image reading apparatus according to an aspect of the invention includes a first reading unit which reads a surface of a document and a second reading unit which reads the other surface of the document. The first and second reading units include off-axial imaging units respectively. The off-axial imaging unit includes plural imaging mirrors in which off-axial reflecting surfaces having curvatures are formed. In the off-axial imaging unit, an incident direction and an outgoing direction of a reference axis light beam are different from each other. The off-axial imaging units are provided such that vertical directions of the first and second reading units become identical while an incident side of the light beam is located below an outgoing side with respect to the imaging unit.
Claims18
An image reading apparatus comprising:
- a first reading device which includes a first imaging unit and a first light receiving sensor, the first imaging unit for imaging light reflected from a first image surface of a document on to the first light receiving sensor, the first light receiving sensor for performing a photoelectric conversion of the imaged light by the first imaging unit;
- and
- a second reading device which includes a second imaging unit and a second light receiving sensor, the second imaging unit for imaging light reflected from a second image surface of the document on to the second light receiving sensor, the second light receiving sensor for performing a photoelectric conversion of the imaged light by the second imaging unit,
- wherein the first imaging unit and the second imaging unit include an off-axial reflecting surface having a curvature, and
- wherein an incident direction of a reference axis light beam differs from an outgoing direction of the reference axis light beam in the first imaging unit and the second imaging unit;
- and
- wherein the first imaging unit and the second imaging unit are respectively disposed in the first reading device and the second reading device so that an incident position is located below an outgoing position.
An image reading apparatus comprising
- a first reading device which includes a first imaging unit and a first light receiving sensor, the first imaging unit for imaging light reflected from a first image surface of a document onto the first light receiving sensor, the first light receiving sensor for performing a photoelectric conversion of the imaged light by the first imaging unit;
- and
- a second reading device which includes a second imaging unit and a second light receiving sensor, the second imaging unit for imaging light reflected from a second image surface of the document onto the second light receiving sensor, the second light receiving sensor for performing a photoelectric conversion of the imaged light by the second imaging unit,
- wherein the first imaging unit and the second imaging unit include an off-axial reflecting surface having curvature, and
- wherein an incident direction of a reference axis light beam differs from an outgoing direction of the reference axis light beam in the first imaging unit and the second imaging unit;
- and
- wherein the first imaging unit and the second imaging unit are respectively disposed in the first reading device and the second reading device so that an incident position is located above an outgoing position.
Dependencies are inferred from the claim text.