Optical scanning apparatus
AssigneeCanon Kabushiki Kaisha
InventorJun Koide
Life of this patent
Estimating the term…
Abstract
In an optical scanning apparatus, a light beam emitted from a light source is collimated and is incident on a reflecting surface of a deflector via stop member. The deflector deflectively reflects the light beam to be directed to a surface to be scanned. The light beam deflectively reflected by the deflector is converged on the surface to be scanned by an optical system. The stop member has an aperture which is constructed such that a circular shape aperture and a slit-like shape aperture are combined. The width of the slit-like shape aperture is arranged in a sub-scanning direction while the circular portion of the circular shape aperture is arranged in a main scanning direction.
Claims16
An optical scanning apparatus comprising:
- light source means;
- a collimating optical system for collimating a beam from said light source means into a parallel beam;
- an optical deflector for deflecting the beam from said collimating optical system;
- a stop member arranged between said collimating optical system and said optical deflector and having a shape as a combination of slit-like and circular apertures;
- and
- an optical system for focusing the beam deflected by said optical deflector.
An optical scanning apparatus comprising:
- light source means;
- an optical deflector for deflecting the beam from said light source means;
- a stop member arranged between said light source means and said optical deflector and having a shape as a combination of slit-like and circular apertures;
- and
- an optical system for focusing the beam deflected by said optical deflector.
A laser beam printer comprising:
- light source means;
- a collimating optical system for collimating a beam from said light source means into a parallel beam;
- an optical deflector for deflecting the beam from said collimating optical system;
- a stop member arranged between said collimating optical system and said optical deflector and having a shape as a combination of slit-like and circular apertures;
- a recording medium;
- and
- an optical system for focusing the beam deflected by said optical deflector on said recording medium.
A laser beam printer comprising:
- light source means;
- an optical deflector for deflecting the beam from said light source means;
- a stop member arranged between said light source means and said optical deflector and having a shape as a combination of slit-like and circular apertures;
- a recording medium;
- and
- an optical system for focusing the beam deflected by said optical deflector on said recording medium.
Dependencies are inferred from the claim text.