| 摘要 |
PROBLEM TO BE SOLVED: To reduce the curvature of field of a multi-beam light source device by making variance in reflection position on a polygon mirror small among laser lights. SOLUTION: The laser lights emitted by semiconductor lasers LD1 to LD4 have their X-axial positions adjusted so that they become pieces of parallel luminous flux through collimator lenses CL1 to CL4. The polarizing directions of the semiconductor lasers LD3 and LD4 are made 90 deg. different from the semiconductor lasers LD1 and LD2, the laser lights of the semiconductor lasers LD1 and LD2 are transmitted through a polarization beam splitter surface in a prism 9, and the laser lights of the semiconductor lasers LD3 and LD4 are reflected, so that the beams of the respective laser lights have the same position in a vertical scanning direction. The four laser lights are made incident on a 2nd prism 10 and split into lights which are transmitted through the beam splitter surface (unpolaried) and lights which are reflected, so that the light which has the same horizontal scanning direction and exits along the X axis will be the projection laser light of the light source.
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