Piezoelectric ceramic composition for use in an ultrasonic wave motor

US6278225A · kind A · utility

Assignee

• DENSO CORPORATION · JP

Inventors

• Toshiatsu Nagaya · Kuwana, JP
• Hirokatsu Mukai · Kuwana, JP
• Takashi Yamamoto · Hakui, JP
• Hiroaki Makino · Tokyo, JP
• Nobuo Kamiya · Ebeye, US

Key dates

• Filing date: Jul 27, 2000
• Grant date: Aug 21, 2001
• Expiry date: Jul 27, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N30/853

Abstract

A piezoelectric ceramic composition, having a tetragonal perovskite structure and represented by a general formula Pb.sub.a Sr.sub.b (Zr.sub.c Ti.sub.d Sb.sub.e Mn.sub.f)O.sub.3 wherein Pb and Sr are assumed to occupy A site, Zr, Ti, Sb and Mn are assumed to occupy B site, and a molar ratio of A site/B site atoms of (a+b)/(c+d+e+f) is more than 1.00 to 1.03, preferably 0.01 to 0.03.