Variable focus device
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United States of America Patent
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-
Feb 3, 2009
Grant Date -
Oct 23, 2008
app pub date -
Apr 17, 2007
filing date -
Apr 17, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A variable focus device is adapted for focusing an image on an image sensing module, and includes a hollow fixing seat, a lens module and a lens coupling unit. The fixing seat is adapted for mounting the image sensing module therein. The lens coupling unit includes a piezoelectric layer and a metal layer disposed on the piezoelectric layer. The piezoelectric and metal layers are respectively formed with aligned lens mounting holes to permit mounting of the lens module to the lens coupling unit. The lens coupling unit is disposed relative to the fixing seat such that the lens module corresponds in position to the fixing seat. The piezoelectric layer deforms in response to application of a control signal thereto to move the lens module relative to the fixing seat, thereby varying a focal position of the lens module relative to the image sensing module in the fixing seat.
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