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Title:
PIEZOELECTRIC ELEMENT AND MUSICAL INSTRUMENT
Document Type and Number:
WIPO Patent Application WO/2018/101359
Kind Code:
A1
Abstract:
Provided are: a piezoelectric element using an electret material that is lightweight and flexible, and having an electrode layer that is also lightweight, wherein the electrode layer has high conductivity and excellent flexibility to ensure that electric signals generated from the electret are easily detected, and also has excellent durability; and a musical instrument having the piezoelectric element. The piezoelectric element has an electrode layer (B) on at least one surface of an electret material (A) having pores therein, and is characterized in that the porosity of the electret material (A) is 20-80%, the electrode layer (B) contains 20-70 mass% of fine particles of carbon, and the thickness of the electrode layer (B) is 2-100 µm.

Inventors:
KOIKE Hiroshi (KASHIMA FACTORY 23, Touwada, Kamisu-sh, Ibaraki 02, 〒3140102, JP)
SUGAMATA Yuutarou (KASHIMA FACTORY 23, Touwada, Kamisu-sh, Ibaraki 02, 〒3140102, JP)
IIDA Seiichiro (3 Kandasurugadai 4-chome, Chiyoda-k, Tokyo 62, 〒1010062, JP)
HIYAMA Kunio (10-1 Nakazawa-cho, Naka-ku, Hamamatsu-sh, Shizuoka 50, 〒4308650, JP)
SASAKI Suguru (10-1 Nakazawa-cho, Naka-ku, Hamamatsu-sh, Shizuoka 50, 〒4308650, JP)
KODAMA Hidekazu (20-41 Higashi-motomachi 3-chome, Kokubunji-sh, Tokyo 22, 〒1850022, JP)
Application Number:
JP2017/042897
Publication Date:
June 07, 2018
Filing Date:
November 29, 2017
Export Citation:
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Assignee:
YUPO CORPORATION (3 Kandasurugadai 4-chome, Chiyoda-ku Tokyo, 62, 〒1010062, JP)
YAMAHA CORPORATION (10-1, Nakazawa-cho Naka-ku, Hamamatsu-sh, Shizuoka 50, 〒4308650, JP)
International Classes:
H01L41/193; H01G7/02; H01L41/047
Domestic Patent References:
WO2013011949A12013-01-24
WO2011034186A12011-03-24
WO2016121765A12016-08-04
WO2011034186A12011-03-24
Foreign References:
JP2016039275A2016-03-22
JP2010089496A2010-04-22
JP2015186910A2015-10-29
JP2009059856A2009-03-19
US20120312585A12012-12-13
JPH0541104A1993-02-19
JP2010089496A2010-04-22
JP2017067763A2017-04-06
JP2016231946A2016-11-30
Attorney, Agent or Firm:
TAKAOKA Ryoichi et al. (Takaoka IP Law Office, Ikebukuro Tosei Building 5th Floor, 5-4-7, Nishi-Ikebukuro, Toshima-k, Tokyo 21, 〒1710021, JP)
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