Title:
PIEZOELECTRIC TRANSFORMER
Document Type and Number:
WIPO Patent Application WO/2015/125632
Kind Code:
A1
Abstract:
This piezoelectric transformer employs the seventh-order vertical oscillation mode, and comprises a piezoelectric element having a length of 7λ/2, a width of less than λ/2, and a thickness of less than λ/2, if the wavelength at the resonance frequency is expressed as λ. The piezoelectric element includes three low-voltage parts and two high-voltage parts. The low-voltage parts and the high-voltage parts are arranged alternately along the length direction such that the low-voltage parts are located at both ends of the piezoelectric element. The low-voltage parts include three polarized regions along the length direction of the piezoelectric element, each polarized region having a length of λ/2. The high-voltage parts include a plurality of polarized regions along the length direction of the piezoelectric element, each polarized region having a length of λ/2. A pair of a first low-voltage electrode and a second low-voltage electrode is formed on respective ends, in the thickness direction, of each of the first, second, and third low-voltage parts. A high-voltage electrode is formed between two adjacent polarized regions among the polarized regions constituting the high-voltage parts.
Inventors:
ASANO HIROSHI (JP)
Application Number:
PCT/JP2015/053375
Publication Date:
August 27, 2015
Filing Date:
February 06, 2015
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01L41/107; H01L41/083; H02J17/00; H02M3/24
Foreign References:
| JP2001024246A | 2001-01-26 | |||
| JPH08162690A | 1996-06-21 |
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
Mutsumi Sameshima (JP)
Mutsumi Sameshima (JP)
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