| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical system which suppresses occurrence of a ghost. <P>SOLUTION: In an optical system having a plurality of optical surfaces, at least two surfaces includes antireflection structures having fine uneven structure whose average pitch is equal to or less than 400 nm. An average height of the fine uneven structure is different between an antireflection structure A formed on one surface and an antireflection structure B formed on the other surface. <P>COPYRIGHT: (C)2012,JPO&INPIT |
