| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to lessen pitch deviation by setting the bends of plural scanning lines by the simultaneously scanning of plural light spots at the same direction. SOLUTION: Four luminous fluxes which are made into parallel luminous fluxes and are radiated from a light source device 10 are converted only in the direction corresponding to the sub-scanning by a cylinder lens 20 which is a line image forming optical system and are formed as the line image long in the direction corresponding to the main-scanning near the polarizing reflection surface of a polygon mirror 30. The four luminous fluxes are polarized and are made incident on an fθlens 40 and are condensed as the four light spots separated from each other in the sub-scanning direction onto a surface 50 to be scanned to simultaneously scan the four scanning lines. A photoconductive photoreceptor is disposed in the position of the surface 50 to be scanned and the four spots simultaneously scan the photoreceptor in actuality. The main rays of the four luminous fluxes exist always on the same side with respect to the optical axis in the optical path from the light source device 10 to the surface 50 to be scanned and the four scanning lines S1 to S4 to be simultaneously scanned by the four light spots have the bends of the scanning lines in the same direction. |
