US3979565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal enclosed transducer assembly
Assignee: Westinghouse Electric Corp
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Filing: 1975-08-11
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Granted: 1976-09-07
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Expires: 1995-08-11
Abstract
Abstract A thick layer of epoxy resin is used to bond together the piezoelectric member and a stainless steel cap to form an acoustic transducer having a broad frequency response, and specific assembling steps are taken to manufacture the transducer with good reproducibility of the characteristics.
Inventors
- 👤 James L. McShane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:38
CPC Classifications
H; H04; H04R; H04R17/00; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0662; B06B1/0674; G; G01; G01F; G01F1/00; G01F1/66; G01F1/662; G01F15/00; G01F15/006; H04R1/00; H04R1/20; H04R1/22; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T29/49; Y10T29/49002; Y10T29/49005
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
138 words
A transducer for the transmission of acoustic energy substantially at given frequency through a transmitting medium, comprising: a piezoelectric member having a front and a back face; a metallic capsule having a front window interposed between said transmitting medium and said front face; and a plastic material interposed between said piezoelectric member and said capsule and forming a plastic layer between said front face and said window; wherein said piezoelectric member, said plastic layer and said capsule window have thicknesses which are substantially equal to the half wavelength of the acoustic wave at said frequency therethrough, each of said thicknesses defining a corresponding peak frequency, wherein each peak frequency is slightly different from the two others, the central frequency being the one of said front window, whereby a broadened frequency response characteristic is otained about said given frequency.
Claim 2
Dependent Claim
138 words
A transducer for the transmission of acoustic energy substantially at given frequency through a transmitting medium, comprising: a piezoelectric member having a front and a back face; a metallic capsule having a front window interposed between said transmitting medium and said front face; and a plastic material interposed between said piezoelectric member and said capsule and forming a plastic layer between said front face and said window; wherein said piezoelectric member, said plastic layer and said capsule window have thicknesses which are substantially equal to the half wavelength of the acoustic wave at said frequency therethrough, each of said thicknesses defining a corresponding peak frequency, wherein each peak frequency is slightly different from the two others, the central frequency being the one of said front window, whereby a broadened frequency response characteristic is otained about said given frequency.
Claim 3
Dependent Claim
12 words
The transducer of claim 1 with said capsule being of stainless steel.
Claim 4
Dependent Claim
13 words
The transducer of claim 2 with said plastic material being an epoxy resin.
Claim 5
Dependent Claim
15 words
The transducer of claim 3 with said plastic layer being bonded on either face thereof.
Claim 6
Dependent Claim
18 words
The transducer of claim 3 including a backup member associated with said back face of said piezoelectric member.
Claim 7
Dependent Claim
25 words
The transducer of claim 5 including a thin film of air interposed between said back face and said backup member for providing acoustic isolation therebetween.
Claim 8
Dependent Claim
26 words
The transducer of claim 6 with means for physically and rigidly connecting said backup member and said piezoelectric member laterally of said thin film of air.
Claim 9
Dependent Claim
18 words
The transducer of claim 5 with said backup member being an acoustic absorber bonded to said piezoelectric member.
Claim 10
Dependent Claim
30 words
The transducer of claim 8 with said acoustic absorber consisting of tungsten-filled epoxy resin, said tungsten-filled epoxy resin being bonded to said back face of said piezoelectric element laterally thereof.
Claim 11
Dependent Claim
29 words
The transducer of claim 5 with said backup member consisting of a resonant member of a half-wavelength layer of material bonded to said back face of said piezoelectric member.
Claim 12
Dependent Claim
19 words
The transducer of claim 5 with said backup member consisting of solid foam material, the pores thereof containing air.
Claim 13
Dependent Claim
19 words
The transducer of claim 6 with said backup member consisting of solid foam material, the pores thereof containing air.
Claim 14
Dependent Claim
65 words
The transducer of claim 6 with said piezoelectric member being of a piezoceramic material having relative to water an acoustic impedance of the order of 22; said plastic layer being an epoxy resin having relative to water an acoustic impedance of the order of 4 and said capsule window being of stainless steel with an acoustic impedance of the order of 30 relative to water.
Claim 15
Dependent Claim
33 words
The transducer of claim 5 with said epoxy resin extending between said backup member and said piezoelectric member on the one hand, and said capsule on the other hand, laterally of said member.
Claim 16
Dependent Claim
20 words
The transducer of claim 14 with said epoxy resin being bonded at least to said capsule and said piezolectric member.
Claim 17
Dependent Claim
37 words
The transducer of claim 15 further including a metallic support for said backup member and said piezoelectric member, with said epoxy resin being bonded to said metallic support and said capsule being connected to said metallic support.
Claim 18
Dependent Claim
15 words
The transducer of claim 16 with said capsule being electron-beam welded to said metallic support.
Claim 19
Dependent Claim
20 words
The transducer of claim 17 further including electrical leads connected to said piezoelectric member and passed through said metallic support.
Claim 20
Dependent Claim
13 words
The transducer of claim 13 with said epoxy resin being cured before bonding.
Claim 21
Dependent Claim
38 words
The transducer of claim 13 further including a metallic support for said backup member and said piezoelectric member, and with said epoxy resin being cast in situ to unite said metallic support, backup members, piezoelectric member and capsule.
Claim 22
Dependent Claim
15 words
The transducer of claim 20 with said capsule being electron beam-welded to said metallic support.
Claim 23
Dependent Claim
20 words
The transducer of claim 20 further including electrical leads connected to said piezoelectric member and passed through said metallic support.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |