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US4137470A
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Magnetostrictive elastic surface wave structure
Assignee: Thales SA
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Filing: 1977-03-08
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Granted: 1979-01-30
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Expires: 1997-03-08
Abstract
Abstract The invention relates to elastic surface-wave structures. The elastic surface wave structure in accordance with the invention comprises a non magnetic substrate and a surface wave transducer containing at least one emissive zone situated in a deposited layer of magnetostrictive material subjected to an alternating magnetic field and to a magnetic polarization field.
Inventors
- 👤 Bernard Desormiere
- 👤 Gerard Volluet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:05
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14502; B; B06; B06B; B06B1/00; B06B1/02; B06B1/08; G; G10; G10K; G10K11/00; G10K11/36
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
127 words
A magnetostrictive elastic surface wave structure comprising a non-magnetic substrate and at least one electromechanical transducer arranged on a free major face of said non-magnetic substrate for converting electrical energy into said elastic surface wave and vice-versa; said electromechanical transducer comprising: a deposit of magnetostrictive material overlaying a portion of said major face, electrical conductive means located above said deposit for creating therein an alternating magnetic field in response to said electrical energy and inductor means creating in said deposit a d.c. bias magnetic field; said elastic surface wave being launched by at least one radiating element pertaining to said deposit; the pattern of said element being in the form of one wavefront of said elastic surface wave and delimited by the geometrical configuration of said deposit.
Claim 2
Dependent Claim
127 words
A magnetostrictive elastic surface wave structure comprising a non-magnetic substrate and at least one electromechanical transducer arranged on a free major face of said non-magnetic substrate for converting electrical energy into said elastic surface wave and vice-versa; said electromechanical transducer comprising: a deposit of magnetostrictive material overlaying a portion of said major face, electrical conductive means located above said deposit for creating therein an alternating magnetic field in response to said electrical energy and inductor means creating in said deposit a d.c. bias magnetic field; said elastic surface wave being launched by at least one radiating element pertaining to said deposit; the pattern of said element being in the form of one wavefront of said elastic surface wave and delimited by the geometrical configuration of said deposit.
Claim 3
Dependent Claim
34 words
A structure as claimed in claim 1, wherein said electromechanical transducer comprises a plurality of coplanar radiating elements pertaining to said deposit; said radiating elements being separated from one another by non radiating gaps.
Claim 4
Dependent Claim
25 words
A structure as claimed in claim 2, wherein the spacing of said radiating elements is substantially equal to the wavelength of said elastic surface waves.
Claim 5
Dependent Claim
26 words
A structure as claimed in claim 2, wherein the spacing of said radiating elements is substantially equal to half the wavelength of said elastic surface waves.
Claim 6
Dependent Claim
18 words
A structure as claimed in claim 2, wherein said radiating elements are strips having substantially the same length.
Claim 7
Dependent Claim
16 words
A structure as claimed in claim 2, wherein said radiating elements are strips having unequal lengths.
Claim 8
Dependent Claim
40 words
A structure as claimed in claim 1, wherein said deposit has a uniform thickness; said electrical conductive means comprising a conductive structure forming a set of interconnected coplanar strips overlaying said deposit for creating a plurality of coplanar radiating elements.
Claim 9
Dependent Claim
31 words
A structure as claimed in claim 2, wherein said radiating elements are separated from one another by said non-radiating gaps; said electrical conductive means comprising a conductive sheet overlaying said deposit.
Claim 10
Dependent Claim
30 words
A structure as claimed in claim 1, wherein the width of said deposit is substantially constant in the direction perpendicular to the direction of propagation of said elastic surface waves.
Claim 11
Dependent Claim
40 words
A structure as claimed in claim 1, wherein, for weighting the radiating intensity of said radiating elements, the width of said deposit, as measured transversely in relation to the propagation direction of said elastic surface waves, has a non-uniform value.
Claim 12
Dependent Claim
19 words
A structure as claimed in claim 2, wherein the width of said non-radiating gaps is non-uniform along said deposit.
Claim 13
Dependent Claim
34 words
A structure as claimed in claim 1, wherein said inductor means comprise a field magnet and a source of electrical energy connected to a winding wound on the magnetic core of said field magnet.
Claim 14
Dependent Claim
25 words
A structure as claimed in claim 12, wherein said d.c. bias magnetic field has a non-uniform intensity in the propagation direction of said surface waves.
Claim 15
Dependent Claim
34 words
A structure as claimed in claim 12, wherein said d.c. bias magnetic field is adjusted for causing the frequency of said surface waves to coincide with the gyromagnetic resonance frequency of said magnetostrictive material.
Claim 16
Dependent Claim
29 words
A structure as claimed in claim 12, wherein the intensity of said d.c. bias magnetic field may assume at least two separate values under the control of switching means.
Claim 17
Dependent Claim
17 words
A structure as claimed in claim 15, wherein one of said separate values is equal to zero.
Claim 18
Dependent Claim
13 words
A structure as claimed in claim 1, wherein said magnetostrictive material is ferrimagnetic.
Claim 19
Dependent Claim
33 words
A structure as claimed in claim 17, wherein said ferrimagnetic material is a garnet of yttrium and iron; said non magnetic substrate being a garnet of Gd 3 Ga 5 O 12 .
Claim 20
Dependent Claim
15 words
A structure as claimed in claim 1 wherein said deposit is buried in said substrate.
Claim 21
Dependent Claim
21 words
A structure as claimed in claim 2, wherein said deposit is provided with a plurality of ridges constituting said radiating elements.
References Cited (Backward Citations)
US3713049A
Cited
US3696312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |