Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/138844
Kind Code:
A1
Abstract:
An elastic wave device in which not only the temperature coefficient of frequency
(TCF) is improved by laminating a temperature characteristics improving film
and a frequency regulation film on a piezoelectric substrate, but also the device
is made thin and the frequency characteristics of a desired frequency can be attained
surely. An IDT electrode (3), a temperature characteristics improving film
(4) and a frequency regulation film (5) are laminated in this order on a piezoelectric
substrate (2). The temperature coefficient of frequency (TCF) of the piezoelectric
substrate (2) has a negative value, the temperature characteristics improving
film is composed of a material having a positive temperature coefficient of frequency
(TCF), and the frequency regulation film (5) is composed of a thin glass film having
a sound velocity of transverse wave slower than that of the temperature characteristics
improving film (4).
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Inventors:
KADOTA MICHIO (JP)
Application Number:
PCT/JP2007/059835
Publication Date:
December 06, 2007
Filing Date:
May 14, 2007
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
KADOTA MICHIO (JP)
KADOTA MICHIO (JP)
International Classes:
H03H9/145
Domestic Patent References:
| WO2005069486A1 | 2005-07-28 |
Foreign References:
| JP2005260296A | 2005-09-22 | |||
| JP2004159262A | 2004-06-03 |
Attorney, Agent or Firm:
MIYAZAKI, Chikara (5-4 Tanimachi 1-chome,Chuo-ku, Osaka-shi, Osaka 12, JP)
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