Objective lens drive device and optical head device
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United States of America Patent
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Oct 21, 2008
Grant Date -
Sep 8, 2005
app pub date -
Mar 7, 2005
filing date -
Mar 8, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
An objective lens drive device includes a drive mechanism for driving a lens holder at least in a focusing direction and a tracking direction. The drive mechanism includes a drive magnet provided with a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in a roughly U-shape. The drive mechanism also includes a tilt drive coil for driving the lens holder in a tilt direction and the tilt drive coil is opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least a focusing drive coil or a tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face.
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