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US3798473A
Expired / Lapsed
US
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Polymer type electroacoustic transducer element
Assignee: Kureha Corp
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Filing: 1972-11-06
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Granted: 1974-03-19
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Expires: 1992-11-06
Abstract
Abstract 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.
Inventors
- 👤 N Murayama
- 👤 K Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:40
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0662; B06B1/0677; H; H04; H04R; H04R17/00; H04R17/005; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/857; H04R17/04; H04R17/08; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
22 words
The piezoelectric electroacoustic transducer element as claimed in claim 1, where in said piezoelectric polymer sheet is a piezoelectric polyvinylidene fluoride sheet.
Claim 2
Dependent Claim
54 words
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.
Claim 3
Dependent Claim
23 words
The piezoelectric electroacoustic transducer element as claimed in claim 1, wherein said backing material is a metal or glass of a large thickness.
Claim 4
Dependent Claim
34 words
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.
Claim 5
Dependent Claim
25 words
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.
Claim 6
Dependent Claim
51 words
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.
Claim 7
Dependent Claim
52 words
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.
Claim 8
Dependent Claim
17 words
The piezoelectric electroacoustic transducer element as claimed in claim 1 wherein said polymer sheet is uniaxially oriented.
Claim 9
Dependent Claim
29 words
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.
Claim 10
Dependent Claim
31 words
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.
Claim 11
Dependent Claim
26 words
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 .
Claim 12
Dependent Claim
55 words
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.
Claim 13
Dependent Claim
15 words
The piezolectric electroacoustic transducer of claim 13 wherein said value is from one-tenth to one-thousandth.
Claim 14
Dependent Claim
51 words
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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |