The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 2021
Filed:
Nov. 29, 2017
Yupo Corporation, Tokyo, JP;
Yamaha Corporation, Shizuoka, JP;
Hiroshi Koike, Ibaraki, JP;
Yutaro Sugamata, Ibaraki, JP;
Seiichiro Iida, Tokyo, JP;
Kunio Hiyama, Shizuoka, JP;
Suguru Sasaki, Shizuoka, JP;
Hidekazu Kodama, Tokyo, JP;
YUPO CORPORATION, Tokyo, JP;
YAMAHA CORPORATION, Shizuoka, JP;
Abstract
Provision of a piezoelectric element which uses a lightweight and flexible electret material and an electrode layer which is also lightweight, has high conductivity and good flexibility to easily receive electrical signals from an electret, and has good durability. Additionally, provision of a musical instrument provided with such a piezoelectric element. A piezoelectric element comprising an electrode layer (B) on at least one surface of an electret material (A) having pores inside, wherein a porosity of the electret material (A) is 20 to 80%, the electrode layer (B) contains 20 to 70 mass % of a carbon fine particle, and a thickness of the electrode layer (B) is 2 to 100 μm.