| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical system (an imaging optical system) in which a formed optical image on an image surface (an imaging surface or the like) has uniform brightness. SOLUTION: Reflectivity in at least one surface (for example, a second surface S2) of the reflection surfaces of an imaging optical system 1 is made different in accordance with the location within the reflection surface. COPYRIGHT: (C)2007,JPO&INPIT
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