Piezoelectric element and musical instrument
US11176918B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 29, 2017 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Nov 29, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G7/023
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.