| 摘要 |
PURPOSE:To adjust easily the position of a laser beam by arranging parallel plane plates which are variable in inclination to a beam on optical paths of mutually parallel laser beams. CONSTITUTION:Mutually parallel beams 31-34 from semiconductor lasers 11-14 are made incident on a converging lens 6 through collimator lenses 21-24, reflecting mirrors 41-44, and an optical deflector 5 to scan on a scanning surface 7. When parallel plane plates 51-54 on optical paths between the collimator lenses and reflecting mirrors are rotated around rotating shafts 60, adjacent beams vary in interval and when they are rotated around rotating shafts 62, upper/lower positions of the beams are adjusted, so that the four beams are aligned strictly in line. Therefore, the positions of the parallel laser beams are easily adjustable through the parallel planes 51-54 of simple structure.
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