发明名称 |
Piezoelectric element, composite piezoelectric element, and filter, duplexer and communication equipment using the same |
摘要 |
A piezoelectric element of the present invention includes a substrate, a lower electrode layer, a piezoelectric layer, an upper electrode layer, a cavity portion formed below a piezoelectric vibrating portion, and at least two bridging portions. The at least two bridging portions are formed so as not to be line-symmetric with respect to any line segment traversing the piezoelectric vibrating portion and/or so as not to be point-symmetric with respect to any point in the piezoelectric vibrating portion in a projection of the piezoelectric vibrating portion in the laminating direction.
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申请公布号 |
US2005110369(A1) |
申请公布日期 |
2005.05.26 |
申请号 |
US20040990435 |
申请日期 |
2004.11.18 |
申请人 |
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发明人 |
ONISHI KEIJI;NAKAMURA HIROYUKI;NAKATSUKA HIROSHI |
分类号 |
H03H9/02;H03H9/13;H03H9/17;H03H9/58;(IPC1-7):H02N2/00;H01L41/04;H01L41/08 |
主分类号 |
H03H9/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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