| 摘要 |
PURPOSE:To inexpensively secure by employing a block for pressing a permanent magnet to a yoke face and clamping it with a screw. CONSTITUTION:A yoke 1 and a center pole 5 are formed in a cylindrical shape, and a permanent magnet 2 are equally divided into several segments and disposed on the inner surface of the yoke 1. A coil is filled in a gap 6 between the yoke 1 and the pole 5 to form a voice coil motor. In this case, after the magnets 2 are disposed on the inner surface of the yoke 1, a block 3 is inserted, and the block 3 is secured by a set screw 4. The oblique surface 3b of the block 3 is contacted with the magnets 2 and magnets 2 are pressed to the inner surface of the yoke 1 by clamping the set screw 4. |
