| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce Fresnel reflection on the surfaces of optical members, to improve transmissivity, and also to prevent a surface reflection ghost generated among a plurality of optical surfaces. <P>SOLUTION: In the observation optical system having a plurality of optical surfaces R1-R10, the optical effective region of at least one surface among the surfaces R1-R10 is provided with a micro-cyclic structure A having a cycle smaller than the wavelength of incident light. For example, the micro-cyclic structure A is provided in the optical effective region of oppositely facing two optical surfaces R2, R3 among the plurality of the optical surfaces or in the optical effective region of at least one surface among the optical surfaces of an objective optical system L1. <P>COPYRIGHT: (C)2004,JPO |
