| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide technique for adjusting distortion and/or astigmatic difference with high precision. <P>SOLUTION: An optical system includes at least one first refractive optical member nearby an object surface and at least one second refractive optical member nearby an image surface, and satisfies 0.4≤¾β¾≤2.5, where β is the imaging magnification of the image surface to the object surface. The optical system holds at least one of the first and second refractive optical members in a plane orthogonal to an optical-axis direction so as to be movable, and has an adjusting means of adjusting one of the astigmatic difference and distortion of the optical system. <P>COPYRIGHT: (C)2009,JPO&INPIT |
