Polymer type electroacoustic transducer element
阅读：319发布：2024-02-13
专利汇可以提供Polymer type electroacoustic transducer element专利检索，专利查询，专利分析的服务。并且A piezoelectric type electroacoustic transducer element having a high sensitivity in a high frequency region is composed of a piezoelectric polymer sheet having on one surface thereof a backing of a material having a larger elasticity (Young''s Modulus) and mass than the elasticity and mass of the piezoelectric polymer sheet.，下面是Polymer type electroacoustic transducer element专利的具体信息内容。
2. The piezoelectric electroacoustic transducer element as claimed in claim 1, where in said piezoelectric polymer sheet is a piezoelectric polyvinylidene fluoride sheet.
3. The piezoelectric electroacoustic transducer element as claimed in claim 1, wherein said piezoelectric polymer sheet is a piezoelectric polymer sheet of a copolymer of vinylidene fluoride and a monomer copolymerizable therewith, wherein said monomer copolymerizable therewith is selected from the group consisting of ethylene tetrafluoride, ethylene trifluoride, vinylfluoride, trifluoroethylenechloride, monochlorovinylidene fluoride or propylene hexafluoride.
4. The piezoelectric electroacoustic transducer element as claimed in claim 1, wherein said backing material is a metal or glass of a large thickness.
5. The piezoelectric electroacoustic transducer element as claimed in claim 1, wherein said backing material is attached to one surface of said piezoelectric polymer sheet through a thin electrode layer formed on the surface thereof.
6. The piezoelectric electroacoustic transducer element as claimed in claim 1, wherein said backing material is attached directly to one surface of said piezoelectric polymer sheet.
7. The piezoelectric electroacoustic transducer element as claimed in claim 1, wherein said piezoelectric polymer sheet has a thin electrode on one surface thereof and said backing of the material is a thick electrode having a larger elastic modulus (Young''s Modulus) and mass than the elasticity and mass of said piezoelectric polymer.
8. The piezoelectric electroacoustic transducer element as claimed in claim 1, wherein said piezoelectric polymer sheet has thin electrodes on both surfaces of said sheet and said backing of the material is an electric insulator having a larger elastic modulus (Young''s Modulus) and mass than the elasticity and mass of said piezoelectric polymer.
9. The piezoelectric electroacoustic transducer element as claimed in claim 1 wherein said polymer sheet is uniaxially oriented.
10. The piezoelectric electroacoustic transducer element as claimed in claim 1 wherein the elastic modulus (Young''s Modulus) of said polymer sheet is between 1 X 103kg/cm2 and 2 X 104kg/cm2.
11. The piezoelectric electroacoustic transducer element as claimed in claim 10 wherein said material of said backing has an elastic modulus (Young''s Modulus) of between 1 X 105kg/cm2 and 1 X 107kg/cm2.
12. The piezoelectric electroacoustic transducer element as claimed in claim 10 wherein said piezoelectric polymer sheet has a thickness of from 4 Mu to 500 Mu .
13. The piezoelectric electroacoustic transducer element as claimed in claim 11 wherein said opposite surface of said sheet used as the pressure-acting surface has a thin film electrode attached thereto, the thin film electrode exhibiting a value obtained by multiplying its mass by its Young''s Modulus smaller than the Young''s Modulus of said piezoelectric polymer sheet.
14. The piezolectric electroacoustic transducer of claim 13 wherein said value is from one-tenth to one-thousandth.
15. The piezoelectric electroacoustic transducer of claim 1 where the piezoelectric polymer sheet consists essentially of piezoelectric polyvinylidene fluoride or a piezoelectric oopolymer thereof with a monomer copolymerizable therewith, wherein said monomer copolymerizable therewith is selected from the group consisting of ethylene tetrafluoride, ethylene trifluoride, vinylfluoride, trifluoroethylenechloride, monochlorovinylidene fluoride or propylene hexafluoride.
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