Invention Grant
- Patent Title: Method of manufacturing cylindrical piezoelectric element
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Application No.: US14219178Application Date: 2014-03-19
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Publication No.: US09768374B2Publication Date: 2017-09-19
- Inventor: Nagahide Sakai
- Applicant: OLYMPUS CORPORATION
- Applicant Address: JP Tokyo
- Assignee: OLYMPUS CORPORATION
- Current Assignee: OLYMPUS CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Scully, Scott, Murphy & Presser, P.C.
- Priority: JP2011-219148 20111003
- Main IPC: H01L41/047
- IPC: H01L41/047 ; H01L41/257 ; H01L41/107 ; H01L41/193 ; H01L41/09 ; H01L41/29 ; H01L41/335 ; H01L41/333

Abstract:
In manufacturing method of a cylindrical piezoelectric element, a cylindrical piezoelectric material is formed by molding a piezoelectric material into a cylindrical shape and subjecting the molded piezoelectric material to calcination. A reference electrode is provided on an inner circumferential surface of the cylindrical piezoelectric material. Drive electrodes are provided in a circumferential direction so that the drive electrodes are extending in an axial direction from one end to the other end on an outer circumferential surface. A polarization electrode is provided at a part of the circumferential surface in the vicinity of the one end. A predetermined voltage is applied between the polarization electrode and the reference electrode. The polarization electrode is removed from the cylindrical piezoelectric material.
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