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US 9,554,010 B2Granted
Image reading apparatus and reflecting mirror unit
AssigneeCanon Kabushiki Kaisha
InventorsTakayuki Suga, Toshiki Kobayashi
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Abstract
The invention relates to an image reading apparatus and includes: scanning unit including a light source; a focusing mirror which reflects light from the light source on a reflecting surface portion; and a mirror holder which fixes the focusing mirror on fixing portions formed at both ends of the mirror holder, wherein, when the scanning unit is moved to read image information, the focusing mirror is formed such that the fixing portion is smaller than the reflecting surface portion in at least one of strength and rigidity.
Claims12
An image reading apparatus comprising:
- a light source which illuminates a reading position,
- a photoelectrical converting unit which converts received light into electricity,
- a mirror holder,
- a focusing mirror which focuses and reflects light reflected from an original at the reading position, wherein the focusing mirror has a reflecting portion having a curved reflecting surface and a pair of fixing portions which are respectively disposed at both ends of the focusing mirror in a longitudinal direction, wherein a first surface of each of the fixing portions, facing the mirror holder, has a projection, and
- a pair of pressing members each of which abuts to a second surface of a respective one of the fixing portions other than the first surface and each of which presses the focusing mirror toward the mirror holder, for fixing the focusing mirror on the mirror holder,
- wherein a geometrical moment of inertia of the fixing portions is smaller than a geometrical moment of inertia of the reflecting portion.
3 more elements
Dependencies are inferred from the claim text.