Drive control circuit that drives vibrator, driving method, vibration-type driving apparatus, and image pickup apparatus
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United States of America Patent
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Dec 12, 2017
Issued Date -
N/A
app pub date -
Jan 29, 2016
filing date -
Jan 30, 2015
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Abstract
A drive control circuit restores a holding force when a vibrator and a driven body have been left at a standstill for a long time period and when they are used in a high-humidity environment. A drive circuit outputs an alternating-current signal, which is to be applied to an electro-mechanical energy conversion element, based on an output from a control unit. The control circuit controls the drive circuit with first timing such that elliptical motion produced in the vibrator takes a path of which a component parallel to a driving direction of the driven body is large as compared to such a path that a speed at which the driven body is driven is the maximum. The first timing is different from second timing with which relative positions of the vibrator and the driven body are changed.
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