Title:
ULTRASONIC SENSOR AND SENSOR DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/053253
Kind Code:
A1
Abstract:
An ultrasonic sensor is provided with a case (10) and a piezoelectric element (20) that is provided on the inner surface (12) of the bottom section (11) of the case and that is subjected to bending vibration together with the bottom section (11). The piezoelectric element (20) comprises a first piezoelectric layer (21) and a second piezoelectric layer (22) that are stacked in the direction leading away from the bottom section (11) with an electrode therebetween and that are electrically connected in parallel. The thickness of the second piezoelectric layer (22) is smaller than the thickness of the first piezoelectric layer (21). The present invention makes it possible to increase the acoustic pressure when transmitting an ultrasonic wave.
Inventors:
MIKAMI SHUJI (JP)
WATANABE KOSUKE (JP)
TABOTA JUN (JP)
WATANABE KOSUKE (JP)
TABOTA JUN (JP)
Application Number:
PCT/JP2014/076770
Publication Date:
April 16, 2015
Filing Date:
October 07, 2014
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H04R17/00; H04R3/00
Foreign References:
| JP2002204497A | 2002-07-19 | |||
| JPH01261879A | 1989-10-18 | |||
| JP2000156988A | 2000-06-06 | |||
| JP2010069618A | 2010-04-02 |
Attorney, Agent or Firm:
Fukami Patent Office, p. c. (JP)
Patent business corporation Fukami patent firm (JP)
Patent business corporation Fukami patent firm (JP)
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