Title:
超音波振動子、超音波探触子及び超音波画像診断装置
Document Type and Number:
Japanese Patent JP5644729
Kind Code:
B2
Abstract:
Object is that an output sound pressure at transmission or an output voltage at reception of a predetermined higher resonance component becomes higher than those of the primary resonance component. The piezoelectric material layer 24 has an electrode on the surface of the piezoelectric material of between the layer and both ends, and outputs and inputs an electrical signal with this electrode. The piezoelectric material 24 has a remanent polarization in a thickness direction, the relationship of the (4P+1)th layer piezoelectric material from fixed end side is used as the basic relationship, piezoelectric materials are periodically arranged so that piezoelectric materials of (4p+2)th and (4p+3)th layer each has an opposite relationship, and (4p+4)th layer has the same relationship as the basic relationship. On the fixed-end side of the piezoelectric material layer 24, provided is the de-matching layer 23 with larger acoustic impedance than the piezoelectric material layer 24 for reflecting vibration propagated from the piezoelectric material layer 24 to the fixed-end side.
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Inventors:
西久保 雄一
Application Number:
JP2011216053A
Publication Date:
December 24, 2014
Filing Date:
September 30, 2011
Export Citation:
Assignee:
コニカミノルタ株式会社
International Classes:
H04R17/00; A61B8/00; G01N29/24; H01L41/083
Attorney, Agent or Firm:
Patent business corporation Mitsuaki international patent firm