| 摘要 |
A system for controlling a distance between an optical head and the surface of a rotating optical disk comprising: an actuator arm having a first and second surface, the first surface facing the optical disk, the second surface facing away from the optical disk; an electromagnetic coil having an inner void, said coil adjacent to the second surface of the arm; and at least one permanent magnet producing a magnetic field that passes through the coil such that when an electric current is applied to the coil, a force is created at two or more segments of the coil.
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