Scanning optical device
AssigneeCanon Kabushiki Kaisha
InventorAtsushi Sano
Life of this patent
Estimating the term…
Abstract
The spot diameter of a laser beam emitted from a first light source, passing through a first stop member, and focused on an object to be scanned is smaller than the spot diameter of a laser beam emitted from a second light source, passing through a second stop member, and focused on an object to be scanned. After the focal depth at the spot diameter of the laser beam emitted from the first light source, passing through the first stop member, and focused on the object to be scanned is adjusted by moving a first holding member holding the first light source at least in the emission direction of the laser beam from the light source, the first holding member and a housing member are bonded with an adhesive, and the first holding member is positioned and fixed to the housing member.
Claims11
A scanning optical device comprising:
- a first holding member holding a first light source;
- a second holding member holding a second light source;
- a first stop member shaping a laser beam emitted from the first light source;
- a second stop member shaping a laser beam emitted from the second light source;
- a deflection scanning unit deflecting and scanning the laser beams from the light sources passing through the stop members;
- scanning lenses focusing the laser beams from the light sources deflected and scanned by the deflection scanning unit on objects to be scanned corresponding to the light sources;
- a housing member holding the holding members, the stop members, the deflection scanning unit, and the scanning lenses;
- protruding portions provided in the housing and used for fixing the first holding member to the housing with an adhesive;
- and
- adhesion portions provided in the first holding member and opposed to the protruding portions of the housing member so as to be movable in the emission direction of the laser beam from the light source,
- wherein, of spot diameters of the laser beams focused on the objects to be scanned, the spot diameter of the laser beam emitted from the first light source, passing through the first stop member, and focused on the object to be scanned, is smaller than the spot diameter of the laser beam emitted from the second light source, passing through the second stop member, and focused on the object to be scanned, and
- wherein after focal depth at the spot diameter of the laser beam emitted from the first light source, passing through the first stop member, and focused on the object to be scanned, is adjusted by moving the first holding member at least in the emission direction, the adhesion portions and the protruding portions are bonded with the adhesive, and the first holding member is positioned and fixed to the housing member.
A scanning optical device comprising:
- a first holding member holding a first light source;
- a second holding member holding a second light source;
- a first stop member shaping a laser beam emitted from the first light source;
- a second stop member shaping a laser beam emitted from the second light source;
- a deflection scanning unit deflecting and scanning the laser beams from the light sources passing through the stop members;
- scanning lenses focusing the laser beams from the light sources deflected and scanned by the deflection scanning unit on objects to be scanned corresponding to the light sources;
- and
- a housing member holding the holding members, the stop members, the deflection scanning unit, and the scanning lenses,
- wherein the first holding member is held, with respect to the housing member, only through the adhesive, in the emission direction of the laser beam from the light source, and
- wherein the second holding member is held, by contacting the housing member, in the emission direction of the laser beam from the light source.
The scanning optical device according to Claim I,
- wherein the first stop member and the second stop member each have a hole through which only part of the laser beam passes, and
- wherein the diameter of the hole of the first stop member through which the laser beam from the first light source passes is larger than the diameter of the hole of the second stop member through which the laser beam of the second light source passes.
Dependencies are inferred from the claim text.