Optical scanning apparatus having scanning line curvature correcting mechanism with sliding pressure point along a longitudinal direction of the optical element
AssigneeCanon Kabushiki Kaisha
InventorsMasaki Sato, Ken-Ichi Tomita, Akihiro Fukutomi
Life of this patent
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Abstract
An optical scanning apparatus for correcting the curvature of a scanning line effectively by a small number or parts, having a rotary polygon mirror for scanning a ray of light, and a reflecting mirror formed over an entire area in the scanning direction of the ray of light, and scanning the ray of light on an image bearing member, the reflecting mirror is nipped and held between a support member for supporting the reflecting mirror and a pressure member for pressing the reflecting mirror toward the support member side, and the pressure member is movable in a main scanning direction.
Claims11
An optical scanning apparatus comprising:
- a deflector, which deflects a laser beam emitted from a light source to scan the laser beam on a scanned surface;
- an optical element, which directs the laser beam deflected by said deflector to the scanned surface;
- a support member, which supports a vicinity of an end portion of said optical element in a longitudinal direction of said optical element;
- a pressure member, which cooperates with said support member to press said optical element on said support member, wherein a supporting point by said support member is fixed, and a pressure point by said pressure member is movable in the longitudinal direction;
- and
- an adjusting mechanism, which slidably adjusts a distance in the longitudinal direction between the supporting point by said support member and the pressure point by said pressure member by sliding the pressure point by said pressure member along the longitudinal direction of said optical element in a state in which said pressure member presses said optical element.
Dependencies are inferred from the claim text.