Two-axis moving coil actuator
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United States of America Patent
Stats
-
Jan 5, 1993
Grant Date -
N/A
app pub date -
Oct 8, 1991
filing date -
Oct 8, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A two-axis electromagnetic actuator for positioning an objective lens in an optical recording system is disclosed wherein the objective lens is mounted on a lens holder. The lens holder is positioned within a magnetic field created by two pairs of permanent magnets. A tracking coil is wound around the lens holder and two focus coils are affixed to the tracking coil adjacent the permanent magnet pairs. The lens holder suspended between the magnet pairs by flexures supported on a circuit board. The circuit board further includes electrical contacts for supplying current to the focus and tracking coils in accordance with feedback signals generated by a servo system. The current through the coils interacts with the magnetic field produced by the magnets to move the lens holder and objective lens carried thereon and effect tracking and focusing of a laser beam exiting the lens upon the surface of an optical disc.
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