| 摘要 |
PROBLEM TO BE SOLVED: To provide an opposed type optical scanning device enabling a high quality image to be obtained with a simple configuration and at a low cost, and to provide an image forming apparatus using the device. SOLUTION: The opposed scanning type optical scanning device includes a plurality of scanning optical systems respectively corresponding to an even number of photoconductors 4, arranged to be substantially symmetrical to each other with a sole polygon mirror 21 (a rotating deflecting device) as a symmetry center, the polygon mirror 21 being arranged substantially at a center in a single optical housing 20, and the opposed scanning type optical scanning device scans the even number of photoconductors 4 simultaneously in a exposure manner with optical beams through the lenses 22, 23 and a plurality of folding-back mirrors 24, 25, 26 of each scanning optical system which are arrange to be symmetry in the right and left direction with the above rotary deflecting means as a symmetry axis, wherein each of the scanning optical systems includes the at least one long lens 23 having power in a sub-scanning direction, and wherein in each of the symmetrically arranged scanning optical systems with the polygon mirror 21 as the symmetry center, a same number of the folding-back mirrors is arranged downstream of the long lens, and wherein the long lenses 23 are arranged to be reversed relative to each other in respective scanning planes. COPYRIGHT: (C)2006,JPO&NCIPI
|
