Vibration wave motor, drive control system, optical apparatus, and electronic apparatus
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United States of America Patent
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Feb 22, 2022
Grant Date -
May 9, 2019
app pub date -
Oct 30, 2018
filing date -
Nov 6, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A vibration wave motor includes a driven body, a vibrator including an annular vibration plate and an annular piezoelectric element, and a vibration damping member, which are arranged in sequence, wherein the vibration plate has, on a side facing the driven body, radially extending groove portions at X places, and, when center depths of the groove portions at X places are sequentially denoted by D1 to DX in a circumferential direction, D1 to DX vary along a curve obtained by superposing one or more sine waves, and wherein the vibration plate is locally supported by the vibration damping member in some or all antinode portions of a standing wave occurring when the vibration wave motor is driven.
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