| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical system having an optical element having an optical surface consisting of an aspherical surface excellent in abrasion resistance and weather resistance or the like. SOLUTION: The optical system has the optical element consisting of an organic-inorganic compound material having the optical surface being the aspherical surface as the 1st surface of the surface incidence of an optical device. COPYRIGHT: (C)2005,JPO&NCIPI
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