| 摘要 |
PURPOSE:To enable to move a sole voice coil in three directions which are perpendicular to each other by crossing cylindrical coils at two positions of an axis symmetry on the peripheral surface of the coil and providing a pair of coil units which are energized by the current of reverse direction. CONSTITUTION:When reverse exciting coils are flowed as shown by arrows Ia, Ib through a pair of coil units 2a, 2b, a force parallel to the side AC or GE, i.e., a force Ft of the direction which is perpendicular to the moving direction for focusing can be generated to a cylindrical coil 10 in a magnetic field. In this manner, even if the magnetic circuit of a permanent magnet is formed of a sole coil, two-dimensional or three-dimensional movements can be performed with the sole structure. |
