Optical beam scanning device, image forming apparatus, optical beam scanning method
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United States of America Patent
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Mar 22, 2011
Grant Date -
Dec 6, 2007
app pub date -
May 31, 2006
filing date -
May 31, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A technique is provided which can realize scanning by a light flux having a desired optical characteristic in a light beam scanning device adopting a multi-beam optical system. There are provided a pre-deflection optical system that shapes divergent light beams from plural light sources into a light flux having a cross-sectional shape long in a specified direction, and a rotary deflector that deflects the light flux shaped by the pre-deflection optical system and scans it in the specified direction, and the pre-deflection optical system includes a first optical system that weakens a degree of divergence of the divergent light beams from the plural light sources or converts them into parallel light beams or converging light beams, a second optical system including at least one lens having a negative power in a rotation axis direction of the rotary deflector, and a third optical system having a positive power in the rotation axis direction of the rotary deflector.
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