| 摘要 |
PROBLEM TO BE SOLVED: To provide a multibeam optical system in which a scan line interval in an auxiliary scanning direction is quite easily switched without using a movement control mechanism composed of highly accurate parts. SOLUTION: Laser beams emitted from respective light emitting points of a light source unit 10 pass through a first optical system 15, pass through a second optical system while being dynamically deflected with a polygon mirror 20, and form scan lines on a plane to be scanned. The first optical system 15 is composed of a plurality of cylindrical lenses. A second cylindrical lens is fixed on a frame so as to be movable with respect to two predetermined points in the optical axis direction, and a plurality of laser beams emitted from the light source unit 10 pass through the second cylindrical lens. COPYRIGHT: (C)2004,JPO&NCIPI
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