| 摘要 |
<P>PROBLEM TO BE SOLVED: To more accurately adjust the position of a lens by using magnetic force. Ž<P>SOLUTION: A guide hole 51E extending parallel to an optical axis A1 is formed in a side of a lens barrel 51 accommodating the lens 53 movable in the direction of the optical axis. A contact 71, which is formed by joining a magnet 61 to the leading end 60A of the head of a screw 60 with a step formed thereon, is inserted into the guide hole 51E, thereby fixing the circumferential position of the lens barrel 51, and moves parallel to the optical axis A1 along the guide hole 51E, thereby moving the lens 53 in the direction of the optical axis A1. A cam 62 formed from an intense magnetic body is fitted in the lens barrel 51 and includes a guide face 62A rotated around the lens barrel 51, thereby moving the contact 71 parallel to the optical axis A1. The guide face 62A is disposed in contact with part of the side of the magnetic 61 of the contact 71 projecting beyond the periphery of the lens barrel 51 from the guide hole 51E. The present invention can be applicable in an objective lens. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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