| 摘要 |
PROBLEM TO BE SOLVED: To resolve the problem that misalignment of optical axes of a collimator lens and a reducing lens unit is apt to occur and adjustment is difficult, in a method of attaching the reducing lens unit to one side of a reducing lens holder and attaching a collimator lens cell unit having had the optical axis adjusted to a laser light source, to the other side as a light source unit for use in a scan optical system of an image forming apparatus or the like. SOLUTION: A collimator lens cell 15 requiring optical axis alignment of high precision and a reducing lens unit 17 are inserted and attached to a cylindrical part 20c formed by simultaneous working from one side of a reducing lens holder 20, and a semiconductor laser holder essentially requiring adjustment for optical axis alignment is configured so that it is screwed and fixed to a plane part 20e in the other side of the reducing lens holder 20 while having the optical axis adjusted. COPYRIGHT: (C)2005,JPO&NCIPI
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