Vibration wave motor and optical device
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United States of America Patent
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Dec 6, 2022
Grant Date -
Nov 5, 2020
app pub date -
Oct 17, 2018
filing date -
Oct 18, 2017
priority date (Note) -
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Abstract
A vibration wave motor includes an element configured to be displaced by application of voltage, and an annular elastic body having a bottom surface coming into contact with the element and a drive surface having a groove, configured to drive a moving element by a vibration wave produced on the drive surface by displacement of the element. The element has a density of 4.2 to 6.0×103 kg/m3. A value of [(T/B)÷W] is in a range of 0.84 to 1.94, where T represents a depth of the groove, B represents a distance from a bottom part of the groove to the bottom surface, and W represents a radial width of the elastic body.
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