US3972011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface elastic wave electromechanical device
Assignee: Thales SA
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Filing: 1975-07-08
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Granted: 1976-07-27
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Expires: 1995-07-08
Abstract
Abstract The present invention relates to surface elastic wave electromechanical devices. The electromechanical device in accordance with the invention comprises a central common transducer and two identical transducers interconnected electrically. The central transducer produces bi-directional radiation, and intermediate means are provided to selectively modify the propagation of the surface elastic waves.
Inventors
- 👤 Gerard Coussot
- 👤 Olivier Menager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:53
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14544; H03H9/1455; H03H9/02535; H03H9/02637; H03H9/02779; H03H9/02818; H03H9/02866
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
201 words
An electromechanical surface elastic wave device for transmitting an electrical signal from one pair of terminals to a further pair of terminals, said device comprising: a substrate having a face for propagating surface elastic waves, and first and second electromechanical transducer means arranged at said face and respectively connected to said one pair and said further pair of terminals; said first and second electromechanical transducer means being arranged to effect selective energy transfer through the medium of said surface elastic waves; said first electromechanical transducer means comprising two identical transducer structures having a common radiation axis and separated from one another by an interval; said second electromechanical transducer means comprising a further transducer structure producing bi-directional radiation along said radiaton axis; said further transducer structure being arranged in said interval midway between said identical transducer structures thereby providing two opposed arms transmitting said surface elastic waves in opposite directions; at least one of said opposed arms being equipped with intermediate means selectively changing the propagation characteristics of said surface elastic waves; the interconnection of said identical transducer structures ensuring in the absence of said intermediate means substantially zero electrical energy transfer between said one pair and said further pair of terminals.
Claim 2
Dependent Claim
201 words
An electromechanical surface elastic wave device for transmitting an electrical signal from one pair of terminals to a further pair of terminals, said device comprising: a substrate having a face for propagating surface elastic waves, and first and second electromechanical transducer means arranged at said face and respectively connected to said one pair and said further pair of terminals; said first and second electromechanical transducer means being arranged to effect selective energy transfer through the medium of said surface elastic waves; said first electromechanical transducer means comprising two identical transducer structures having a common radiation axis and separated from one another by an interval; said second electromechanical transducer means comprising a further transducer structure producing bi-directional radiation along said radiaton axis; said further transducer structure being arranged in said interval midway between said identical transducer structures thereby providing two opposed arms transmitting said surface elastic waves in opposite directions; at least one of said opposed arms being equipped with intermediate means selectively changing the propagation characteristics of said surface elastic waves; the interconnection of said identical transducer structures ensuring in the absence of said intermediate means substantially zero electrical energy transfer between said one pair and said further pair of terminals.
Claim 3
Dependent Claim
33 words
A device as claimed in claim 1, wherein said intermediate means comprise at least one conductive band deposited upon said face between said further transducer structure and one of said identical transducer structures.
Claim 4
Dependent Claim
41 words
A device as claimed in claim 1, wherein said intermediate means comprise at least one depression zone formed by ion erosion of said face; said depression zone being located between said further transducer structure and one of said identical transducer structures.
Claim 5
Dependent Claim
45 words
A device as claimed in claim 1, wherein said intermediate means comprise at least one zone having modified physical characteristics; said zone being formed beneath said surface by ion implantation and being located between said further transducer structure and one of said identical transducer structures.
Claim 6
Dependent Claim
17 words
A device as claimed in claim 1, further comprising electrostatic screening means located between said transducer structures.
Claim 7
Dependent Claim
29 words
A device as claimed in claim 1, wherein at least one of said transducer structures is constituted by a set of electrodes in the form of interdigitated comb structures.
Claim 8
Dependent Claim
16 words
A device as claimed in claim 1, wherein said substrate is made of a piezo-electric material.
Claim 9
Dependent Claim
35 words
A device as claimed in claim 6, wherein the teeth of said comb structures have dissimilar lengths for forming a succession of dissimilar, rectilinear radiating intervals delimited by the mutually opposite portions of said teeth.
Claim 10
Dependent Claim
18 words
A device as claimed in claim 5, wherein said electrostatic screening means are constituted by said intermediate means.
Claim 11
Dependent Claim
29 words
A device as claimed in claim 1, wherein said intermediate means introduce between said opposed arms a differential phase shift in said surface elastic waves, substantially equal to π.
References Cited (Backward Citations)
US3872410A
Cited
US3908137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |