Fringing field focus motor and mechanism for optical disk drive
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United States of America Patent
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Nov 29, 2005
Grant Date -
May 16, 2002
app pub date -
Sep 4, 2001
filing date -
Jun 23, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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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