| 摘要 |
PROBLEM TO BE SOLVED: To realize an optical system having high performance that approximates the theoretical value, without generating causes of errors, such as a loose gap between an optical element and a mirror frame. SOLUTION: The lens frame 21 of a lens 20 fitted in the mirror frame 10 incudes a cam part 22 or 24, which is formed having an outline such as an eccentric arc, corresponding to the cam receiving part 12 or 14 of the mirror frame 10. The cam 22 or 24 is brought into contact with the cam receiving part 12 or 14 by relatively turning the lens 20 inserted in the mirror frame 10. Thus, the lens 20 is automatically positioned and fixed to the mirror frame 10, such that the center 20a of the lens coincides with the center 10a of the mirror frame. COPYRIGHT: (C)2006,JPO&NCIPI
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