| 摘要 |
PURPOSE:To stably form the shape of a coil and to eliminate the contacting friction of the coil by holding a coil bobbin to a carriage in a cantilever, and interposing a slide between the bobbin and a central yoke of the body. CONSTITUTION:A body 1 is composed by securing with a screw 6 a central yoke 7 to the bottom of a cylindrical outside yoke 5, and providing a permanent magnet 8 at the inside near the hole of the yoke 5. A coil bobbin 2 is inserted between the yoke 7 of the body 1 and the yoke 5 in movable state, and a cap 9 bonded to the base end is coupled with a carriage 3 and held in a cantilever. A coil 10 is wound in a gap G between the yoke 7 of the magnet 8 on the outer periphery of the bobbin 2, bonded to the cap 9, a mounting hole is formed at the inner end of the bobbin 2, and a ball bearing 11 which forms a slide is formed in the hole to be support to the yoke 7. |
