发明名称 |
PIEZOELECTRIC ELEMENT, OSCILLATORY WAVE MOTOR, AND OPTICAL APPARATUS |
摘要 |
A piezoelectric element that can decrease the output voltage for detection relative to the input voltage for driving without requiring a step-down circuit between a detection phase electrode and a phase comparator and an oscillatory wave motor including the piezoelectric element are provided. A piezoelectric element includes a piezoelectric material having a first surface and a second surface, a common electrode disposed on the first surface, and a drive phase electrode and a detection phase electrode disposed on the second surface. An absolute value d(1) of a piezoelectric constant of the piezoelectric material in a portion (1) sandwiched between the drive phase electrode and the common electrode and an absolute value d(2) of a piezoelectric constant of the piezoelectric material in a portion (2) sandwiched between the detection phase electrode and the common electrode satisfy d(2)<d(1). An oscillatory wave motor includes this piezoelectric element. |
申请公布号 |
US2014125199(A1) |
申请公布日期 |
2014.05.08 |
申请号 |
US201214128519 |
申请日期 |
2012.06.21 |
申请人 |
FURUTA TATSUO;SAITO HIROSHI;KUBOTA MAKOTO;AKASHI KENICHI;CANON KABUSHIKI KAISHA |
发明人 |
FURUTA TATSUO;SAITO HIROSHI;KUBOTA MAKOTO;AKASHI KENICHI |
分类号 |
H02N2/10;H01L41/047;H01L41/18;H01L41/29 |
主分类号 |
H02N2/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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