US3893048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matched MIC delay line transducer using a series array
Assignee: United States Department of the Army
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Filing: 1974-07-08
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Granted: 1975-07-01
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Expires: 1994-07-08
Abstract
Abstract A transducer for a bulk-mode acoustic delay line comprises a plurality of series-connected transducers and a series inductance deposited at the end of the delay line. The number and configuration of the series-connected transducers is selected such that the sum of the resistive components of their impedances matches the driving impedance. The value of the inductance is chosen to balance the combined capacitive components of the series-connected transducers. Series contact between the electrodes of adjacent transducers is achieved by configuring the ground layer electrode with a finger-like projection which is overlapped by a similar projection in the top layer electrode of the adjacent transducer. The overlapping portions of the electrodes are permitted to make electrical contact with one another by removing the piezoelectric material from the overlap region.
Inventors
- 👤 Stuart I Lieberman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:38
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
242 words
A transducer arrangement for a bulk mode acoustic delay line comprising a plurality of series connected, adjacent, closely spaced transducers disposed on an end surface of said delay line, each two adjacent transducers of said plurality of transducers comprising first and second transducers each having, a thin film metal ground layer electrode, the end of said electrode of said first transducer extending beyond said first transducer and abutting said second transducer, a layer of electromechanical transducer material disposed on said ground layer electrode and having a transducer material top surface and at least a side surface at right angles thereto and covering all but a specified exposed end portion of the transducer ground layer electrode, said end of said first transducer ground layer electrode being the end of said specified end portion of said first transducer ground layer electrode, and a thin film metal top layer electrode disposed on said top surface of said transducer material layer and overlying part of said ground layer electrode, the top layer electrode of said second transducer extending beyond said ground layer electrode of said second transducer and into overlying contact with the specified exposed end portion of the ground layer electrode of said first transducer to connect said first and second transducers in series, said top layer electrode of said second transducer being bent at right angles down a said side surface of transducer material and then at right angles again into said overlying contact.
Claim 2
Dependent Claim
242 words
A transducer arrangement for a bulk mode acoustic delay line comprising a plurality of series connected, adjacent, closely spaced transducers disposed on an end surface of said delay line, each two adjacent transducers of said plurality of transducers comprising first and second transducers each having, a thin film metal ground layer electrode, the end of said electrode of said first transducer extending beyond said first transducer and abutting said second transducer, a layer of electromechanical transducer material disposed on said ground layer electrode and having a transducer material top surface and at least a side surface at right angles thereto and covering all but a specified exposed end portion of the transducer ground layer electrode, said end of said first transducer ground layer electrode being the end of said specified end portion of said first transducer ground layer electrode, and a thin film metal top layer electrode disposed on said top surface of said transducer material layer and overlying part of said ground layer electrode, the top layer electrode of said second transducer extending beyond said ground layer electrode of said second transducer and into overlying contact with the specified exposed end portion of the ground layer electrode of said first transducer to connect said first and second transducers in series, said top layer electrode of said second transducer being bent at right angles down a said side surface of transducer material and then at right angles again into said overlying contact.
Claim 3
Dependent Claim
30 words
The transducer arrangement according to claim 1 wherein said series-connected transducers are arranged in a mosaic pattern of columns and rows, the series connections between transducers defining a zig-zag path.
Claim 4
Dependent Claim
60 words
The transducer arrangement according to claim 1 further comprising an inductance connected in series with said transducers and deposited on said end surface of said delay line, the value of said inductance being such that its impedance at the operating frequency of said transducer arrangement is substantially equal to the impedance of the overall capacitance of said series connected transducerS.
Claim 5
Dependent Claim
33 words
The transducer arrangement according to claim 3 wherein said deposited inductance comprises two deposited inductors, each deposited to one side of said plurality of transducers and each deposited inductor defining a zig-zag path.
Claim 6
Dependent Claim
47 words
The transducer arrangement according to claim 2 wherein the metal ground layer electrodes of at least said transducers which are not the end transducers of said columns and rows are T shaped, one part of said T forming a tab which includes said specified exposed end portion.
Claim 7
Dependent Claim
57 words
The transducer arrangement according to claim 5 wherein said end surface of said delay line is generally circular and wherein said mosaic pattern resides in a strip extending diametrically across said end surface, said transducer arrangement further comprising two spaced terminals secured to said end surface and electrically-connected to different ends of the series connection of transducers.
Claim 8
Dependent Claim
24 words
The transducer arrangement to claim 6 wherein said terminals are configured as segments of a circle disposed on opposite sides of said diametrically-extending strip.
Claim 9
Dependent Claim
57 words
The transducer arrangement according to claim 2 wherein said end surface of said delay line is generally circular and wherein said mosaic pattern resides in a strip extending diametrically across said end surface, said transducer arrangement further comprising two spaced terminals secured to said end surface and electrically-connected to different ends of the series connection of transducers.
Claim 10
Dependent Claim
25 words
The transducer arrangement according to claim 8 wherein said terminals are configured as segments of a circle disposed on opposite sides of said diametrically-extending strip.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |