| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical scanning device capable of suppressing fluctuations of beam spot intervals on scanned surfaces of a plurality of light fluxes emitted from a light source. <P>SOLUTION: An optical scanning device includes a light source; pre-deflector optical system, polygon mirror, and a scanning optical system. The scanning optical system includes a first scanning lens 21, a second scanning lens 22, and a third scanning lens 23. The first scanning lens 21 and the second scanning lens 22 are scanning lenses made from resin, and the third scanning lens 23 is a scanning lens made from glass. The third scanning 23 has positive power only in a Z-axis direction. In a sub scanning corresponding direction, absolute values of focus distances of the first scanning lens 21 and the second scanning lens 22 are shorter than or equal to a focus distance of the third scanning lens 23. <P>COPYRIGHT: (C)2013,JPO&INPIT |
