| 摘要 |
PROBLEM TO BE SOLVED: To precisely adjust the front and rear positions of a collimating lens in a compact optical device. SOLUTION: By holding a movable part including the collimating lens by two springs, the movable part including the collimating lens is stably adjusted in terms of the front and rear positions. Furthermore, by providing a groove part in the vicinity of a contact point of a cylindrical holder with the movable part including the collimating lens, the front and rear positions of the movable part including the collimating lens to an optical axis are precisely adjusted.
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