| 摘要 |
PURPOSE:To realize structure which necessitates no feed to a movable part, to prevent disconnection in a fast operation from being generated, and to evade a coil from being brought into contact with a magnetic circuit by the deformation of the coil due to heat, by using a permanent magnet in the movable part in a galvanomirror part which realizes a tracking function. CONSTITUTION:A reflecting mirror is integrated with a rotatably movable permanent magnet 202, a back yoke 203, and a movable sleeve 204, and is supported in a rotatable state. As the neutral holding means of the movable part 204, a neutral holding permanent magnet 301 and a holding magnetic poles 302 and 303 are provided. And by moving the neutral holding permanent magnet 301 and the holding magnetic poles 302 and 303 horizontally, adjustment at the time of assembling can be performed easily compared with a case where neutral holding is performed by a means such as a spring, etc. Also, an electromagnetic is constituted of a magnetic pole 304, the coil 305, a magnetic pole 306, and the coil 307, and the angle of rotation of the movable part 204 can be controlled by controlling a current on the coils 305 and 307. In such a way, it is possible to remove a problem for the disconnection of a feed line in the fast operation, and to evade the coil from being brought into contact with the magnetic circuit by the deformation of the coil due to the heat. |
