| 摘要 |
PROBLEM TO BE SOLVED: To install a permanent magnet in a movable part to restrain the gravity center of the movable part from being deviated from the swing center of the movable part in an optical device which swings the movable part by a magnetic force which acts between an electromagnet and a magnet installed in the movable part. SOLUTION: A magnet installed in a movable part comprises two members, that is, an upper magnet and a lower magnet. The upper magnet is installed on the upper surface of the movable part, and the lower magnet is installed on the lower surface of the movable part. Consequently, the gravity center of the movable part is restrained from being deviated from the swing center of the movable part. Furthermore, the first magnetic pole of the upper magnet faces, across the movable part, the second magnetic pole of the lower magnet, and the upper magnet and the lower magnet are fixed to the movable part by the magnetic force. Since the amount of an adhesive used for fixing the magnets to the movable part is decreased, the gravity center of the movable part is restrained from being deviated from the swing center of the movable part due to the weight of the adhesive. COPYRIGHT: (C)2011,JPO&INPIT
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