Sheet-like fiber structure, and battery, heat insulation material, waterproof sheet, scaffold for cell culture, and holding material each using the sheet-like fiber structure
US-9932239-B2 · Apr 3, 2018 · US
Piezoelectric stack
US10998488B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10998488-B2 |
| Application number | US-201314439394-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 29, 2013 |
| Priority date | Oct 31, 2012 |
| Publication date | May 4, 2021 |
| Grant date | May 4, 2021 |
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- Title
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Abstract
Official abstract text for this publication.
A piezoelectric stack includes a porous resin sheet, and a surface coating layer disposed on an exterior surface of the porous resin sheet, the exterior surface including at least one of a front surface and a back surface of the porous resin sheet, the surface coating layer having a volume resistivity of not less than 1×10 13 Ω·cm, the porous resin sheet and the surface coating layer having different elastic moduli.
First claim
Opening claim text (preview).
The invention claimed is: 1. A piezoelectric stack comprising: a piezoelectric sheet comprising a nonwoven fabric or a woven fabric formed of fibers comprising an organic polymer, and a surface coating layer disposed on an exterior surface of the piezoelectric sheet, the exterior surface including at least one of a front surface and a back surface of the piezoelectric sheet, the surface coating layer having a volume resistivity of not less than 1×10 13 Ω·cm, the piezoelectric sheet and the surface coating layer having different elastic moduli, wherein the nonwoven fabric and the woven fabric are other than a stretched porous film, wherein a coefficient of variation of the diameters of the fibers is not more than 0.7, and wherein an average fiber diameter of the fibers is 0.05 to 1.3 μm. 2. The piezoelectric stack according to claim 1 , wherein the difference in elastic modulus between the piezoelectric sheet and the surface coating layer is not less than 10 MPa. 3. The piezoelectric stack according to claim 1 , wherein the surface coating layer has a relative dielectric constant of 2 to 100. 4. The piezoelectric stack according to claim 1 , wherein the surface coating layer covers the front and back surfaces and end surfaces of the piezoelectric sheet. 5. The piezoelectric stack according to claim 1 , wherein the piezoelectric sheet has a porosity of not less than 60%. 6. The piezoelectric stack according to claim 1 , wherein the organic polymer is an organic polymer free from a molecular dipole or a crystal dipole. 7. The piezoelectric stack according to claim 1 , wherein the organic polymer is polytetrafluoroethylene. 8. A piezoelectric stack comprising: a piezoelectric sheet comprising a nonwoven fabric or a woven fabric formed of fibers comprising an inorganic material, the piezoelectric sheet having a porosity of not less than 60%, wherein the nonwoven fabric and the woven fabric are other than a stretched porous film, and wherein an average fiber diameter of the fibers is 0.05 to 0.9 μm, and a surface coating layer disposed on an exterior surface of the piezoelectric sheet, the exterior surface including at least one of a front surface and a back surface of the piezoelectric sheet, the surface coating layer having a volume resistivity of not less than 1×10 13 Ω·cm, the piezoelectric sheet and the surface coating layer having different elastic moduli. 9. The piezoelectric stack according to claim 8 , wherein the surface coating layer is disposed on the front and back surfaces and end surfaces of the piezoelectric sheet.
Assignees
Inventors
Classifications
- H01G7/02Primary
Electrets, i.e. having a permanently-polarised dielectric · CPC title
having a heterogeneous dielectric · CPC title
Fluoropolymer fibres · CPC title
with fluoropolymers · CPC title
characterised by the compounding ingredients of the macro-molecular coating (D06N3/005 takes precedence) · CPC title
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Frequently asked questions
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- What does patent US10998488B2 cover?
- A piezoelectric stack includes a porous resin sheet, and a surface coating layer disposed on an exterior surface of the porous resin sheet, the exterior surface including at least one of a front surface and a back surface of the porous resin sheet, the surface coating layer having a volume resistivity of not less than 1×10 13 Ω·cm, the porous resin sheet and the surface coating layer having di…
- Who is the assignee on this patent?
- Nihon Valqua Kogyo Kk, A School Corporation Kansai Univ, Valqua Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01G7/02. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue May 04 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).