| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical scanning device capable of forming a highly precise image by reducing pitch unevenness from a wave optics viewpoint and sub-scanning field curvature when a deflection surface is inclined. <P>SOLUTION: The optical scanning device comprises: light source means composed of a semiconductor laser; deflection means performing deflection scanning a luminous flux from the light source means; an incident optical system which forms a focal line image of the luminous flux from the light source means on a deflection surface of the deflection means or a vicinity thereof; and an imaging optical system including a plurality of imaging lenses for forming an image of the luminous flux deflected by the deflection surface, on the surface to be scanned. At least one optical surface of the plurality of imaging lenses constituting the imaging optical system has a non-circular shape in a sub-scanning section, a non-circular amount of the non-circular shape changes in the main scanning direction, and ds (Y=0) and ds (Y=Ymax) respectively representing a paraxial field curvature on an optical axis of the surface to be scanned and a paraxial field curvature in the sub-scanning direction of the luminous flux formed at a maximum image height in an effective scanning range are appropriately set respectively. <P>COPYRIGHT: (C)2013,JPO&INPIT |
