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US 2006/0139720 A1Published application
Scanner apparatus and image forming apparatus
AssigneeBrother Kogyo Kabushiki Kaisha
InventorRyota Kato
Life of this patent
Estimating the term…
Abstract
A cylindrical lens is positioned between and a polygon mirror and a second slit plate through which light beams from two light beam emitting units pass, and the cylindrical lens has a thin portion where the thickness between the entrance plane and the emission plane is reduced by forming the cylindrical lens in a shape created by cutting off a surface top part of the entrance plane having a convex cross section. The light beams passed through the second slit plate pass through light converging portions provided on both sides of the thin portion of the cylindrical lens in a sub-scanning direction, and are converged on a focal point on a deflecting plane of the polygon mirror.
Claims33
A scanner apparatus comprising:
- a light beam emitting unit for emitting a light beam;
- a lens having a thin portion where a thickness between an entrance plane side and an emission plane side is reduced, of a shape lacking a surface top part on the entrance plane side having a convex cross section, for converging a light beam incident on a portion other than the thin portion from said light beam emitting unit on a single focal point after emitted from the emission plane side;
- and
- a deflecting unit having a deflecting plane for reflecting and deflecting the light beam from said lens, for scanning the light beam in one scanning direction.
1 more element
A scanner apparatus comprising:
- a light beam emitting unit for emitting a light beam;
- a lens having a thin portion where a thickness between an entrance plane side and an emission plane side is reduced by a concave unit in a part of the emission plane side facing a surface top part of the entrance plane side having a convex cross section, for converging a light beam incident on a portion other than the thin portion from said light beam emitting unit on a single focal point after emitted from the emission plane side;
- and
- a deflecting unit having a deflecting plane for reflecting and deflecting the light beam from said lens, for scanning the light beam in one scanning direction.
1 more element
A scanner apparatus comprising:
- a light beam emitting unit for emitting a light beam;
- a lens having a light converging portion for converging the light beam from said light beam emitting unit on a single focal point, and a thin portion whose thickness in a passing direction of the light beam when incident on the light converging portion is not larger than a maximum thickness of the light converging portion in the passing direction and whose focal length differs from the light converging portion;
- and
- a deflecting unit having a deflecting plane for reflecting and deflecting the light beam converged by the light converging portion, for scanning the light beam in one scanning direction.
1 more element
An image forming apparatus comprising:
- a photoconductor;
- a light beam emitting unit for emitting a light beam to expose said photoconductor to light;
- a lens having a thin portion where a thickness between an entrance plane side and an emission plane side is reduced, of a shape lacking a surface top part on the entrance plane side having a convex cross section, for converging a light beam incident on a portion other than the thin portion from said light beam emitting unit on a single focal point after emitted from the emission plane side;
- and
- a deflecting unit having a deflecting plane for reflecting and deflecting the light beam from said lens, for scanning the light beam in one scanning direction on said photoconductor.
2 more elements
An image forming apparatus comprising:
- a photoconductor;
- a light beam emitting unit for emitting a light beam to expose said photoconductor to light;
- a lens having a thin portion where a thickness between an entrance plane side and an emission plane side is reduced by a concave unit in a part of the emission plane side facing a surface top part of the entrance plane side having a convex cross section, for converging a light beam incident on a portion other than the thin portion from said light beam emitting unit on a single focal point after emitted from the emission plane side;
- and
- a deflecting unit having a deflecting plane for reflecting and deflecting the light beam from said lens, for scanning the light beam in one scanning direction on said photoconductor.
2 more elements
An image forming apparatus comprising:
- a photoconductor;
- a light beam emitting unit for emitting a light beam to expose said photoconductor to light;
- a lens having a light converging portion for converging the light beam from said light beam emitting unit on a single focal point, and a thin portion whose thickness in a passing direction of the light beam when incident on the light converging portion is not larger than a maximum thickness of the light converging portion in the passing direction and whose focal length differs from the light converging portion;
- and
- a deflecting unit having a deflecting plane for reflecting and deflecting the light beam converged by the light converging portion, for scanning the light beam in one scanning direction on said photoconductor.
2 more elements
Dependencies are inferred from the claim text.