Title:
ULTRASONIC TRANSDUCER AND MULTI-FEED DETECTION SENSOR
Document Type and Number:
WIPO Patent Application WO/2013/084911
Kind Code:
A1
Abstract:
The present invention achieves an ultrasonic transducer that has a structure suitable for use in the high-frequency band, and that is less likely to be affected by capacitive coupling noise. The ultrasonic transducer (1) is provided with a transducer (11) and metal terminals (5, 6). The transducer (11) is provided with a matching layer (11A) and a piezoelectric element layer (11B). The piezoelectric element layer (11B) is formed by alternately layering electrode layers (11D1-11D5) of which there are an odd number and piezoelectric body layers (11C1-11C4) of which there are an even number, and performs thickness vibration. Electrode layers (11D1, 11D3, 11D5) that are provided at odd-numbered positions in the layering order are connected to a reference potential via the metal terminal (5). Electrode layers (11D2, 11D4) that are provided at even-numbered positions in the layering order are connected to a signal potential via the metal terminal (6).
Inventors:
NISHIE JUNICHI (JP)
KONDO CHIKASHI (JP)
OTA JUNSHI (JP)
ASADA TAKAAKI (JP)
KONDO CHIKASHI (JP)
OTA JUNSHI (JP)
ASADA TAKAAKI (JP)
Application Number:
PCT/JP2012/081455
Publication Date:
June 13, 2013
Filing Date:
December 05, 2012
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H04R17/00; H01L41/083
Foreign References:
| JP2010275131A | 2010-12-09 | |||
| JPS61103398A | 1986-05-21 | |||
| JPS5582899U | 1980-06-07 | |||
| JP2005108989A | 2005-04-21 | |||
| JP2005123554A | 2005-05-12 | |||
| JPS6270707A | 1987-04-01 |
Attorney, Agent or Firm:
Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
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Claims: