Patent ID: 9614141
Date: 2017-04-04
CPC Classifications: B41J,G02B,H01L,H02N,H04N

Claim:
1. A piezoelectric ceramic containing a metal oxide expressed by general formula (1) and Mn at 0.04 weight parts to 0.36 weight parts relative to 100 weight parts of the metal oxide in terms of metal; the piezoelectric ceramic comprising a plurality of first crystal grains having a perovskite structure and a plurality of second crystal grains existing between the first crystal grains and having a crystal structure different from that of the first crystal grains; the second crystal grains containing a metal oxide expressed by a general formula (2) or a general formula (4) as a principal ingredient: where 0.09≦x≦0.30, 0.025≦y≦0.085 and 0.986≦a≦1,020; where 0≦v≦1, 0≦w≦1, 1≦b≦6, 2≦c≦19, b+2c−1≦d≦b+2c and b<c; where 0≦m≦1, 0≦n≦1, 2≦e≦5, 1≦f≦3, g=e+2f and e>f.