| 摘要 |
PROBLEM TO BE SOLVED: To obtain a laser scanning optical device in which respective luminous fluxes are focused on a photoreceptor body to scan the photoreceptor body in a substantially equal condition by preventing magnification in a subscanning direction from becoming high, and image surface curving and a bow are excellently corrected. SOLUTION: In the laser scanning optical device, the luminous fluxes emitted from a plurality of light sources 12 are converged in the subscanning direction z with a light source optical system, guided to the deflection face 19a of a polygon mirror, respective luminous fluxes BY, BM, BC, and BK are simultaneously deflected with a single deflection face 19a, and are focused on a photoreceptor body 30 with a first optical system which has a power mainly in a main scanning direction and a second optical system (scanning lenses 25Y, 25K, 25M, and 25C) which has a power mainly in a subscanning direction. Further, the first face of a scanning lens 25 has a free-form surface and the magnification in the subscanning direction of the scanning optical system is different with respect to the luminous fluxes BY and BK, and the luminous fluxes BM and BC, and the diameters of apertures 17M and 17C and apertures 17Y and 17K in the subscanning direction z are different. COPYRIGHT: (C)2005,JPO&NCIPI
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