Invention Grant
- Patent Title: Piezoelectric ceramic, method for making same, piezoelectric element, liquid discharge head, ultrasonic motor, and dust cleaner
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Application No.: US13989756Application Date: 2011-11-18
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Publication No.: US09614140B2Publication Date: 2017-04-04
- Inventor: Takanori Matsuda , Hiroshi Saito , Tatsuo Furuta , Jumpei Hayashi , Takayuki Watanabe , Toshihiro Ifuku
- Applicant: Takanori Matsuda , Hiroshi Saito , Tatsuo Furuta , Jumpei Hayashi , Takayuki Watanabe , Toshihiro Ifuku
- 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: JP2010-264223 20101126
- International Application: PCT/JP2011/077277 WO 20111118
- International Announcement: WO2012/070667 WO 20120531
- Main IPC: H01L41/08
- IPC: H01L41/08 ; H01L41/187 ; B41J2/16 ; C04B35/626 ; B08B7/02 ; H01L41/43 ; H01L41/09 ; H02N2/10 ; H02N2/16

Abstract:
A barium titanate piezoelectric ceramic having good piezoelectric properties and mechanical strength and a piezoelectric element that includes the ceramic are provided. A method for making a piezoelectric ceramic includes forming a compact containing barium titanate particles, sintering the compact, and decreasing the temperature of the compact. The sintering includes (A) increasing the temperature of the compact to a temperature range of a shrinking process of the compact; (B) increasing the temperature of the compact to a temperature range of a liquid phase sintering process of the compact; (C) decreasing the temperature of the compact to the temperature range of the shrinking process of the compact; and (D) retaining the third temperature.
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