Driver of vibrator, method of driving the same, lens driver, vibration device, and imaging device
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United States of America Patent
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Nov 21, 2017
Issued Date -
N/A
app pub date -
Dec 17, 2014
filing date -
Dec 20, 2013
priority date (Note) -
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Abstract
One aspect of the present invention relates to a driver of a vibrator including: a control section; and an alternating current signal generation section configured to generate an alternating current signal based on an output from the control section, and to apply the alternating current signal to the vibrator, wherein the control section is configured to lower a frequency of the alternating current signal, and to change, after the frequency change, at least one of a voltage ratio and a phase difference of the alternating current signal such that the ellipse ratio of the elliptical motion changes from a first ellipse ratio to a second ellipse ratio, the second ellipse ratio has a larger ratio of a component in a moving direction in the elliptical motion to a component in a direction perpendicular to the moving direction in the elliptical motion than the first ellipse ratio.
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