Optical scanning apparatus and image forming apparatus using the same
AssigneeCanon Kabushiki Kaisha
InventorKeiichiro Ishihara
Life of this patent
Estimating the term…
Abstract
An optical scanning apparatus includes an incidence optical system for causing a beam emitted from a light source to be incident on a deflector, and a scanning optical system for causing the beam reflected and deflected by the deflector to be imaged on a surface to be scanned. The scanning optical system has a first lens on the deflector side and a second lens on the surface to be scanned side. The first lens has positive power in the main scanning direction and has negative power in the sub scanning direction. The power of the first lens in the main scanning direction is greater than the power of the second lens in the main scanning direction, and the second lens has positive power in the sub scanning direction.
Claims2
An optical scanning apparatus comprising incidence optical means for causing a beam emitted from light source means to be incident on deflecting means, and scanning optical means for causing the beam reflected and deflected by said deflecting means to be imaged on a surface to be scanned, characterized in that said scanning optical means has a first lens on said deflecting means side and a second lens on said surface to be scanned side, said first lens has positive power in the main scanning direction and has negative power in the sub scanning direction, the power of said first lens in the main scanning direction is greater than the power of said second lens in the main scanning direction, and said second lens has positive power in the sub scanning direction.
2-74. (canceled)
Dependencies are inferred from the claim text.