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US 7,729,031 B2Granted
Light-source device, optical scanning device, and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsTadashi Nakamura, Yoshinori Hayashi, Naoki Miyatake, Tomohiro Nakajima
Life of this patent
Estimating the term…
Abstract
A line-imaging lens condenses a light beam from a light-source unit in one direction to form a line image. An optical deflecting unit deflects the light beam passing through the line-imaging lens. An imaging optical unit images the light beam deflected by the optical deflecting unit in a spot shape on a scanning surface to be scanned. An adjusting unit adjusts a position of irradiation of the light beam from the light-source unit on the optical deflecting unit.
Claims19
An optical scanning device comprising:
- a light-source unit that emits a light beam;
- a line-imaging lens that condenses the light beam from the light-source unit in one direction to form a line image;
- an optical deflecting unit that deflects the light beam passing through the line-imaging lens;
- an imaging optical unit that images the light beam deflected by the optical deflecting unit in a spot shape on a scanning surface to be scanned;
- and
- an adjusting unit that adjusts a position of irradiation of the light beam from the light-source unit on the optical deflecting unit so that the position of irradiation of the light beam from the light-source unit is guided to substantially a center of the optical deflecting unit in the main scanning direction.
3 more elements
A light-source device comprising:
- a light-source unit that emits a light beam;
- a lens that condenses the light beam from the light-source unit in a predetermined condensing state;
- a holding member that integrally holds the light-source unit and the lens;
- a light-source supporting member abutting on a plane orthogonal to an optical axis of the light-source unit at the holding member and supporting the holding member;
- and
- a light-source angle adjusting member that adjusts an angle of the plane.
3 more elements
An optical scanning device comprising:
- a light-source unit that emits a light beam;
- an optical deflecting unit that is supported by a torsional bar, and deflects the light beam from the light-source unit to scan a main scanning area in a reciprocating manner;
- an imaging optical unit that images the light beam scanned by the optical deflecting unit in a spot shape on a scanning surface to be scanned;
- and
- a beam-incident-position adjusting unit that adjusts an incident position of the optical beam with respect to the optical deflecting unit in such a manner that spot sizes of the optical beams at respective ends of the main scanning area substantially coincide with each other.
2 more elements
Dependencies are inferred from the claim text.