| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical scanner with a small variation of the interval between fluxes of light on a side 8 to be scanned, by suppressing changes in the deflection angle, in the subscanning direction of the fluxes of light accompanying the change in the temperature of a resin lens 7. SOLUTION: This optical scanner comprises a light source 1, having a plurality of light emission parts to which light modulation can be made independently in the subscanning direction; a collimating lens 2 which makes the respective light beams outgoing from the light emission parts into an approximately parallel light beam, an opening 3 which specifies the outer edge of the parallel light beam; a cylindrical lens 4 with the shape formed in the subscanning direction of the parallel light beam; a polygon mirror 5 which performs deflection scanning on the shaped light beam; and a scanning optical system 9 which sequentially scans and images the deflected and scanned light beam 10 onto the side to be scanned. The scanning optical system 9 comprises a plurality of lenses that include the resin lens 7, having a positive power in the subscanning direction, and the opening 3 and the resin lens 7 have an optically conjugate relation in the subscanning direction. COPYRIGHT: (C)2009,JPO&INPIT
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