Patent ID: 7619799
Filing Date: 2009-11-17
Classification: B41J,G02B,G03G,H04N

Abstract:
1. A light scanning device comprising: a light source for emitting a plurality of beams; a polygon mirror for deflecting the plural beams by reflection of an identical facet thereof; an optical system including optical elements for leading the beams correspondingly to a plurality of illumination targets laid out along an auxiliary scan direction; and a baseplate having the polygon mirror and the optical elements arranged along the directions of the beams emitted from the polygon mirror, attached thereon, wherein the baseplate is formed so that vertical-sectionally thick portions, which are made large in the vertical section and vertical-sectionally thin portions, which are made thin in the vertical section, are alternately formed from the position where the polygon mirror is attached toward the positions of attachment of the optical elements; and the optical elements are arranged at the vertical-sectionally thick portions on the baseplate; and the thickness of the vertical-sectionally thick portion is specified so that the attachment portion of the optical element will not experience the resonance caused by the vibration from the apparatus on which the light scanning device is mounted and the resonance caused by the vibration entailed with the rotation of a polygon motor.