| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a higher-performance optical system which reduces the restrictions on a layout structure of the optical system. <P>SOLUTION: In an optical system that includes an aperture diaphragm specifying light flux, a first portion, that is a part of an opening shape of the aperture diaphragm, includes a plurality of first stick-like members. The lengthwise direction of the plurality of stick-like members is parallel to a predetermined first direction and is specified by a first variable light-shielding member which is placed in proximity, in the widthwise direction. <P>COPYRIGHT: (C)2010,JPO&INPIT |
