Title:
Transducer with improved impedance matching
Document Type and Number:
Japanese Patent JP6293733
Kind Code:
B2
Abstract:
A transducer (140) having a mechanical impedance over an operative frequency range and having a desired power coupling (145) to a load over the operative frequency range comprises a piezoelectric device (141) having a frequency distribution of modes in the operative frequency range; and an overmould (143). The overmould (143) is arranged to surround at least part of the piezoelectric device (141); and the parameters of the overmould (143) are selected to provide a required impedance matching between the mechanical impedance of the transducer (140) and the mechanical impedance of the load. An alternative transducer comprises a mounting means for holding a discrete portion of at least a part of the periphery of the piezoelectric device wherein the parameters of the mounting means are selected to provide a required boundary condition for the periphery of the piezoelectric device whereby the desired power coupling between the transducer and the load is provided.
Inventors:
East, james
Neil John, Harris
Neil John, Harris
Application Number:
JP2015507593A
Publication Date:
March 14, 2018
Filing Date:
April 23, 2013
Export Citation:
Assignee:
NVF Tech Limited
International Classes:
H04R17/00; H01L41/053; H01L41/09
Domestic Patent References:
| JP2007505540A | ||||
| JP2010528547A | ||||
| JP2008061081A | ||||
| JP2010027500A | ||||
| JP2006352464A | ||||
| JP11164396A | ||||
| JP2011133058A |
Attorney, Agent or Firm:
Tadashige Ito
Tadahiko Ito
Shinsuke Onuki
Tadahiko Ito
Shinsuke Onuki
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