VARIABLE SHAPE MIRROR AND OPTICAL PICKUP DEVICE
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United States of America Patent
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Issued Date -
Nov 13, 2008
app pub date -
May 9, 2008
filing date -
May 9, 2007
priority date (Note) -
Abandoned
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Abstract
In a variable shape mirror including a base substrate; a mirror with a mirror surface; a fixed part, arranged on the base substrate, for fixing the mirror and the base substrate; and an actuator using a piezoelectric ceramics arranged between the base substrate and the mirror; an initial voltage of the actuator is a negative voltage. The initial voltage differs for each actuator; and is larger than or equal to a voltage at which a displacement of the actuator becomes minimum and smaller than zero voltage. The negative initial voltage is a bias voltage, and a voltage stroke is performed while applying the bias voltage.
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