Invention Grant
- Patent Title: Piezoelectric element, vibrator, vibration wave motor, optical apparatus, and electronic apparatus
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Application No.: US16029434Application Date: 2018-07-06
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Publication No.: US11081638B2Publication Date: 2021-08-03
- Inventor: Jumpei Hayashi , Makoto Kubota , Shinya Koyama , Tatsuo Furuta , Kanako Oshima
- Applicant: CANON KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: CANON KABUSHIKI KAISHA
- Current Assignee: CANON KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Agency: Canon U.S.A., Inc. IP Division
- Priority: JPJP2017-137179 20170713
- Main IPC: G02B7/04
- IPC: G02B7/04 ; H01L41/083 ; H01L41/187 ; H01L41/257 ; H01L41/297 ; H01L41/273 ; H02N2/10 ; H01L41/047 ; H02N2/00 ; G02B7/08
Abstract:
A piezoelectric element includes a piezoelectric material layer and an electrode layer, wherein the piezoelectric material layer and the electrode layer are stacked on top of each other, the piezoelectric material layer includes a barium titanate-based material, and two coercive fields Ec1 and Ec2 of the piezoelectric element have the same sign and satisfy (|Ec2|−|Ec1|)≥8 kV/cm.
Public/Granted literature
- US20190019940A1 PIEZOELECTRIC ELEMENT, VIBRATOR, VIBRATION WAVE MOTOR, OPTICAL APPARATUS, AND ELECTRONIC APPARATUS Public/Granted day:2019-01-17
Information query
