Title:
ULTRASONIC TRANSDUCER
Document Type and Number:
WIPO Patent Application WO/2017/061422
Kind Code:
A1
Abstract:
An ultrasonic transducer (10) is provided with: a tubular bottomed case (20) having a hollow portion (20S) formed therein; and a piezoelectric vibration element (30) that is contained in the hollow portion and is arranged on the inner surface of a case bottom (22) positioned at the bottom surface of the hollow portion. In a cross section parallel with the case bottom, the hollow portion has a shape which is relatively long in one direction and is relatively short in another direction. The bottom (22) is provided with a thick portion (23) and a pair of thin portions (24, 25) positioned at both outer sides, in the relatively long one direction, of the thick portion (23). The piezoelectric vibration element is disposed on the thick portion (23). Of the case (20), a circumferential wall portion (28) of a recessed portion (26) formed by providing the thin portion (24) to the bottom (22) includes, at ends in the relatively short other direction, flat portions (28F1, 28F2) each having a flat planar shape. Accordingly, impact resistance can be improved, and anisotropy of directivity characteristics can also be improved.
Inventors:
KOHNO YU (JP)
Application Number:
PCT/JP2016/079483
Publication Date:
April 13, 2017
Filing Date:
October 04, 2016
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H04R17/00; B60R21/00
Domestic Patent References:
| WO2010064712A1 | 2010-06-10 |
Foreign References:
| JP2001013239A | 2001-01-19 | |||
| JP2001078296A | 2001-03-23 | |||
| JP2002055156A | 2002-02-20 | |||
| JP2004040614A | 2004-02-05 | |||
| JP2001326987A | 2001-11-22 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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