Title:
PIEZOELECTRIC VIBRATION ELEMENT AND PIEZOELECTRIC FILTER
Document Type and Number:
WIPO Patent Application WO/2002/082646
Kind Code:
A1
Abstract:
A piezoelectric vibration element using zinc oxide as a piezoelectric material, wherein ratio Le/H between an exciting electrode length Le and a vibration element thickness H is optimized to thereby eliminate unnecessary resonance called an inharmonic overtone; a piezoelectric vibration element providing as main vibration a thickness-direction longitudinal vibration in which a polarizing direction is in the thickness direction of a piezoelectric plate, or a piezoelectric vibration element providing as main vibration a thickness-direction sliding vibration in which a polarizing direction is in the length-wise direction of a piezoelectric plate, wherein Le/H is set to be at least 4 and up to 100 to eliminate unnecessary resonance between a main vibration resonance frequency and an anti-resonance frequency, thereby providing stable characteristics.
Inventors:
SASAKI YUKINORI (JP)
Application Number:
PCT/JP2002/003176
Publication Date:
October 17, 2002
Filing Date:
March 29, 2002
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
SASAKI YUKINORI (JP)
SASAKI YUKINORI (JP)
International Classes:
H01L41/18; H03H9/17; H01L41/09; H03H9/56; H03H9/58; (IPC1-7): H03H9/17; H03H9/54
Foreign References:
| JPS4932864Y1 | 1974-09-05 | |||
| JPH08242026A | 1996-09-17 | |||
| JPH0637579A | 1994-02-10 | |||
| JPS62220012A | 1987-09-28 | |||
| JPS5593315A | 1980-07-15 | |||
| JPH098594A | 1997-01-10 |
Other References:
See also references of EP 1376864A4
Attorney, Agent or Firm:
Iwahashi, Fumio c/o Matsushita Electric Industrial Co. (Ltd. 1006 Oaza Kadoma Kadoma-shi, Osaka, JP)
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