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US 2015/0029283 A1Published application
Optical scanning device and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsHitoshi Iwai, Keiichi Sato, Jun Ogata
Life of this patent
Estimating the term…
Abstract
There is provided an optical scanning device and an image forming apparatus including the optical scanning device. The optical scanning device includes an optical box containing light source units, a rotating polygon mirror, and a motor. In order to prevent the entire optical box from being deformed by deformation occurring in the installation region due to heat of the driving unit, the optical box includes a connection region between a second sidewall and an installation region where a driving unit is installed. The optical box further includes regions provided next to the connection region and having heights different from each other. A concave portion is formed in the connection region.
Claims14
An optical scanning device comprising:
- a deflection unit including:
- a rotating polygon mirror configured to deflect a first light beam emitted from a first light source and a second light beam emitted from a second light source, such that the first light beam scans a first photosensitive member and the second beam scans a second photosensitive member, wherein the rotating polygon mirror is configured to deflect the first light beam and the second light beam in respective directions opposite to each other in respect to the rotating polygon mirror;
- a motor configured to cause the rotating polygon mirror to rotate;
- and
- a driving unit configured to drive the motor;
- a first reflection mirror configured to guide the first light beam deflected by the rotating polygon mirror, onto the first photosensitive member;
- a second reflection mirror configured to guide the second light beam deflected by the rotating polygon mirror, onto the second photosensitive member;
- and
- an optical box including a bottom, to which the deflection unit, the first reflection mirror, and the second reflection mirror are attached, and sidewalls standing from the bottom and to which the first light source and the second light source are attached,
- wherein the bottom includes a wave-shaped bottom having a wave shape in cross section in a scanning direction of the both light beams deflected by the rotating polygon mirror, and the wave-shaped bottom is provided in a region surrounded by one of the sidewalls located opposite a light path of each of the first light beam and the second light beam that are incident on the rotating polygon mirror in the scanning direction, the deflection unit, the first reflection mirror, and the second reflection mirror.
7 more elements
An optical scanning device comprising:
- a light source;
- a rotating polygon mirror configured to deflect a light beam emitted from the light source;
- a driving unit configured to drive the rotating polygon mirror to rotate;
- and
- an optical box containing the rotating polygon mirror and the driving unit,
- wherein the optical box includes,
- an installation region in which the rotating polygon mirror and the driving unit are installed,
- a first sidewall to which the light source is fixed,
- a second sidewall provided opposite the first sidewall, relative to the rotating polygon mirror,
- a bottom to which first and second optical components are attached, wherein the first optical component is configured to guide a first light beam deflected by the rotating polygon mirror to a first photosensitive member, and the second optical component is configured to guide a second light beam deflected by the rotating polygon mirror to a second photosensitive member different from the first photosensitive member and that is provided opposite the first optical component relative to the rotating polygon mirror, and
- a connection region provided between the first optical component and the second optical component, connecting the second sidewall to the installation region, and having a height different from a height of the bottom in a height direction orthogonal to the bottom, and
- wherein the connection region includes,
- a first wall provided on the first optical component side, and connecting the bottom to the connection region,
- a second wall provided on the second optical component side, and connecting the bottom to the connection region, and
- a wave-shaped region having a wave shape in a cross section that is orthogonal to the connection region without intersecting the first wall and the second wall.
12 more elements
An image forming apparatus comprising:
- a first photosensitive member;
- a second photosensitive member;
- and
- an optical scanning device comprising:
- a light source;
- a rotating polygon mirror configured to deflect a light beam emitted from the light source;
- a driving unit configured to drive the rotating polygon mirror to rotate;
- and
- an optical box containing the rotating polygon mirror and the driving unit,
- wherein the optical box includes,
- an installation region in which the rotating polygon mirror and the driving unit are installed,
- a first sidewall to which the light source is fixed,
- a second sidewall provided opposite the first sidewall, relative to the rotating polygon mirror,
- a bottom to which first and second optical components are attached, wherein the first optical component is configured to guide a first light beam deflected by the rotating polygon mirror to a first photosensitive member, and the second optical component is configured to guide a second light beam deflected by the rotating polygon mirror to a second photosensitive member different from the first photosensitive member and that is provided opposite the first optical component relative to the rotating polygon mirror, and
- a connection region provided between the first optical component and the second optical component, connecting the second sidewall to the installation region, and having a height different from a height of the bottom in a height direction orthogonal to the bottom, and
- wherein the connection region includes,
- a first wall provided on the first optical component side, and connecting the bottom to the connection region,
- a second wall provided on the second optical component side, and connecting the bottom to the connection region, and
- a wave-shaped region having a wave shape in a cross section that is orthogonal to the connection region without intersecting the first wall and the second wall.
16 more elements
Dependencies are inferred from the claim text.