Piezoelectric actuator
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United States of America Patent
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-
Oct 29, 2013
Grant Date -
Jun 27, 2013
app pub date -
Apr 6, 2012
filing date -
Dec 22, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A piezoelectric actuator for driving a lens unit along an optical axis is disclosed. The piezoelectric actuator includes a fixed member, a movable member movably received in the fixed member, a magnet fixed on the fixed member, a metal sheet fixed on the movable member, a piezoelectric member and a circuit board. The movable member includes a contacting portion. The metal sheet is aligned with the magnetic along a direction substantially perpendicular to the optical axis. The metal sheet is made from a material that can be attracted by the magnet and lighter than the magnet. The piezoelectric member is fixed on the fixed member and contacts on the contacting portion of the movable member for driving the movable member to move along the optical axis. The circuit board provides voltages to the piezoelectric member.
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