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US 10,998,488 B2Granted
Piezoelectric stack
AssigneesValqua, Ltd., The School Corporation Kansai University
InventorsTetsuya Komeda, Yuki Yamanaka, Yoshiro Tajitsu
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Abstract
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 1×1013 Ω·cm, the porous resin sheet and the surface coating layer having different elastic moduli.
Claims9
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 1×1013 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.
3 more elements
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 1×1013 Ω·cm, the piezoelectric sheet and the surface coating layer having different elastic moduli.
Dependencies are inferred from the claim text.