APPARATUS INCLUDING OPTICAL DEFLECTOR CONTROLLED BY SAW-TOOTH VOLTAGE AND ITS CONTROLLING METHOD
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United States of America Patent
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Issued Date -
Aug 18, 2016
app pub date -
Jan 20, 2016
filing date -
Jan 20, 2016
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Abstract
An optical deflector includes a mirror; a piezoelectric actuator adapted to rock the mirror around an axis of the mirror; and a piezoelectric sensor adapted to sense vibrations of the piezoelectric actuator. A control unit includes: a saw-tooth voltage generating block adapted to generate a saw-tooth voltage; an integral block adapted to calculate an integral voltage of a sum of a sense voltage of the piezoelectric sensor and a DC offset characteristic voltage; a DC offset characteristic voltage calculating block adapted to calculate the DC offset characteristic voltage in accordance with the integral voltage; a subtracter block adapted to generate a deviation between the saw-tooth voltage and the integral voltage; and a controller adapted to generate a drive voltage in accordance with the deviation to apply the drive voltage to the piezoelectric actuator.
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