| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical scanner having an inexpensive and simple structure in which the light quantity distribution on a face to be scanned is uniformized. SOLUTION: An overfilled optical system is composed in such a way that four laser beams emitted from a laser light source 10 in which four light sources are arranged in line in a subscanning direction are made incident on a polygon mirror 28 via a collimator lens 12, a slit 14, a first cylindrical lens 16, a first reflection mirror 18, a second reflection mirror 20, a second cylindrical lens 22, a filter 24, and a third cylindrical lens 26. In this optical system, the angle between an incident optical axis L and a scanning optical axis Ls is set to be 65 degrees, the incident optical axis L is moved by a predetermined distance toward an fθ30 lens side, and the optical axis is adjusted for uniformizing light quantity. Thus, the whole laser light sources in the light source 10 is adjusted only by adjusting the light quantity at one light source. COPYRIGHT: (C)2006,JPO&NCIPI |
