| 摘要 |
PURPOSE:To reduce the size of an optical scanning system by forming a mirror, a light source, and a lens system integrally. CONSTITUTION:A collimator lens 16 is screwed fixedly in a screw part provided to a base 15 and a cylindrical beam expander 17 is screwed fixedly in a screw part provided to the collimator lens 16. Further, the base 15 is fixed to a holding cylinder 18 with a screw and the holding cylinder 18 is fixed to an external cylinder case 2' with a screw 19. A laser beam B' projected from a semiconductor laser 12 is made into an elliptically sectioned parallel beam through a collimator lens 16 and then made into a circularly sectioned parallel beam through a cylindrical beam expander 17 to reach a mirror surface 1a. The laser beam deflected by the mirror surface 1a forms an image on a scanned surface through an f.theta lens 4. |
