US4409510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for providing ultraacoustic transducers of the line curtain or point matrix type and transducers obtained therefrom
Assignee: Consiglio Nazionale delle Richerche
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Filing: 1982-10-14
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Granted: 1983-10-11
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Expires: 2002-10-14
Abstract
Abstract Method for providing ultraacoustic transducers of the line curtain or point matrix type, and products obtained therefrom, wherein it is provided the step of forming a bar (10) of piezoelectric material having any length but width and thickness almost equal to each other, metalizing the faces (2, 4) of this bar (10) normal to the polarization axis, sticking one of the non-metalized faces (3) with a face of a substrate (5), depositing at least one metallic electrode (8) on both opposite faces (6, 7) of the substrate (5) normal to the face thereof connected with the bar (10), connecting these electrodes (8) with the metalized faces (2, 4) of the bar (10) by depositing a layer (9) of conductive epoxy resin on both opposite faces (6, 7) of the substrate (5) and coating the whole assembly by a complete jacket (11) of epoxy resin. (FIG. 5).
Inventors
- 👤 Donello Assenza
- 👤 Massimo Pappalardo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:33
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; H; H04; H04R; H04R17/00; H04R17/04; H04R17/08; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
An ultraacoustic line curtain or point matrix transducer, characterized by a piezoelectric bar (10) having width and thickness almost equal to each other and provided with four faces (1, 2, 3, 4,) two of which (2, 4) are metalized, a substrate (5) connected with one (3) of both non-metalized faces of the piezoelectric bar (10) and provided with at least a metallic electrode (8) deposited on both opposite faces (6, 7) thereof, which are normal to the face connected with said one (3) of both non-metalized faces of the piezoelectric bar (10), said electrode (8) being connected with the metalized faces (2, 4) of the bar (10) by a layer (9) of conductive epoxy resin, and an external coating jacket (11) of epoxy resin which encloses completely the bar (10) and the substrate (5) with the electrodes (8).
Claim 2
Dependent Claim
138 words
An ultraacoustic line curtain or point matrix transducer, characterized by a piezoelectric bar (10) having width and thickness almost equal to each other and provided with four faces (1, 2, 3, 4,) two of which (2, 4) are metalized, a substrate (5) connected with one (3) of both non-metalized faces of the piezoelectric bar (10) and provided with at least a metallic electrode (8) deposited on both opposite faces (6, 7) thereof, which are normal to the face connected with said one (3) of both non-metalized faces of the piezoelectric bar (10), said electrode (8) being connected with the metalized faces (2, 4) of the bar (10) by a layer (9) of conductive epoxy resin, and an external coating jacket (11) of epoxy resin which encloses completely the bar (10) and the substrate (5) with the electrodes (8).
Claim 3
Dependent Claim
17 words
An ultraacoustic transducer according to claim 1, wherein said piezoelectric bar (10) consists of a piezoelectric ceramic.
Claim 4
Dependent Claim
28 words
An ultraacoustic transducer according to claim 2, wherein said piezoelectric ceramic is selected from the group consisting of lead metaniobate (PbNb 2 O 3 ), PZT5A and PZT7A.
Claim 5
Dependent Claim
17 words
An ultraacoustic transducer according to claim 1, wherein said piezoelectric bar (10) consists of a piezoelectric crystal.
Claim 6
Dependent Claim
17 words
An ultraacoustic transducer according to claim 4, wherein said piezoelectric crystal is lithium niobate (LiNbO 3 ).
Claim 7
Dependent Claim
14 words
An ultraacoustic transducer according to claim 1, wherein said substrate (5) consists of vetronite.
Claim 8
Dependent Claim
19 words
An ultraacoustic transducer according to claim 1, wherein said epoxy resin of the coating jacket (11) consists of araldite.
Claim 9
Dependent Claim
23 words
An ultraacoustic transducer according to claim 1, wherein said coating jacket (11) is loaded with powders of materials having a high acoustic impedance.
Claim 10
Dependent Claim
19 words
An ultraacoustic transducer according to claim 8, wherein said materials having a high acoustic impedance are powders of tungsten.
Claim 11
Dependent Claim
19 words
An ultraacoustic transducer according to claim 8, wherein said material having a high acoustic impedance are powders of aluminum.
Claim 12
Dependent Claim
37 words
An ultraacoustic transducer according to claim 1, wherein said coating jacket (11) is provided with a thickness of a quarter-wave of the emitted signal in correspondence with the free emitting face (1) of the piezoelectric bar (10).
Claim 13
Dependent Claim
31 words
An ultraacoustic transducer according to claim 1, wherein cuts are provided for separating the electrodes (8) perpendicularly to the plane of the substrate (5) on which said electrodes (8) are deposited.
Claim 14
Dependent Claim
34 words
An ultraacoustic transducer according to claim 1, wherein the electronics for processing the signal is integrated on a substrate (5) of the transducer having a thickness less than that of the piezoelectric bar (10).
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |