US3963997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the directive transmission of elastic surface waves and process for making the same
Assignee: Thales SA
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Filing: 1974-10-25
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Granted: 1976-06-15
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Expires: 1994-10-25
Abstract
Abstract The invention relates to the directive transmission of elastic surface waves. The object of the invention is a device comprising a crystalline substrate on whose surface elastic surfaces waves can be propagated. The value of surface-wave phase velocity can be changed by local modification of the crystalline lattice structure in a directive zone formed immediately below the surface. The structural modification of the lattice structure can be produced by ion implantation.
Inventors
- 👤 Pierre Hartemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:36
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/42; H03H9/44; G; G10; G10K; G10K11/00; G10K11/36; H03H3/00; H03H3/007; H03H3/08; H03H9/02; H03H9/02535; H03H9/02637; H03H9/02779
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
93 words
A device for the directive transmission of elastic surface waves, comprising: a crystalline substrate having a surface for propagating said elastic surface waves, and at least one directive zone formed in a portion of said substrate, said directive zone extending immediately below said surface; said directive zone having a permanently modified structure lacking to a substantially degree the regular arrangement of atoms of the lattice structure of the adjacent portions of said substrate, for causing a change in the phase velocity of said elastic surface waves within the extent of said directive zone.
Claim 2
Independent Claim
93 words
A device for the directive transmission of elastic surface waves, comprising: a crystalline substrate having a surface for propagating said elastic surface waves, and at least one directive zone formed in a portion of said substrate, said directive zone extending immediately below said surface; said directive zone having a permanently modified structure lacking to a substantially degree the regular arrangement of atoms of the lattice structure of the adjacent portions of said substrate, for causing a change in the phase velocity of said elastic surface waves within the extent of said directive zone.
Claim 3
Dependent Claim
21 words
A device as claimed in claim 1, wherein said change in the phase velocity consists of an increase in such velocity.
Claim 4
Dependent Claim
21 words
A device as claimed in claim 1, wherein said change in the phase velocity consists of a decrease in such velocity.
Claim 5
Dependent Claim
22 words
A device as claimed in claim 1, comprising in said surface two directive zones bounding a guide gap of substantially constant width.
Claim 6
Dependent Claim
38 words
A device as claimed in claim 1, wherein said directive zone is a wave-guiding zone of substantially constant width: said width being evaluated in said surface along a direction perpendicular to the longitudinal axis of said waveguiding zone.
Claim 7
Dependent Claim
39 words
A device as claimed in claim 1, wherein the outline of said directive zone in said surface comprises two outline portions encountered consecutively by said elastic surface waves; said outline portions pertaining to a bounded region in said surface.
Claim 8
Dependent Claim
15 words
A device as claimed in claim 6, wherein said outline portions have a uniform separation.
Claim 9
Dependent Claim
16 words
A device as claimed in claim 6, wherein the outline portions have a non uniform separation.
Claim 10
Dependent Claim
17 words
A device as claimed in claim 6, wherein at least one of the outline portions is straight.
Claim 11
Dependent Claim
17 words
A device as claimed in claim 6, wherein at least one of the outline portions is curvilinear.
Claim 12
Dependent Claim
27 words
A device as claimed in claim 1, wherein a number of adjacent directive zones is provided for forming an acoustic diffraction network for said elastic surface waves.
Claim 13
Dependent Claim
17 words
A device as claimed in claim 11, wherein the pitch of said adjacent directive zones is constant.
Claim 14
Dependent Claim
18 words
A device as claimed in claim 11, wherein the pitch of said adjacent directive zones is non uniform.
Claim 15
Dependent Claim
22 words
A device as claimed in claim 1, wherein said surface bears conductive electrodes forming at least one elastic surface wave radiation source.
Claim 16
Dependent Claim
22 words
A device as claimed in claim 1, wherein the portion of said substrate containing said directive zone is contiguous with said surface.
Claim 17
Dependent Claim
14 words
A device as claimed in claim 2, wherein said substrate is made of quartz.
Claim 18
Dependent Claim
15 words
A device as claimed in claim 3, wherein said substrate is made of lithium niobate.
Claim 19
Independent Claim
101 words
A method for permanently modifying in the extent of a predetermined zone the phase velocity of elastic surface waves propagated along the surface of a crystalline substrate, said method comprising the steps of: making an ion implanted layer within the extent of said predetermined zone by selectively directing a beam of accelerated ions toward said surface, and varying the accelerating potential of said ions in the course of the implanting for producing an unburied zone having a permanently modified structure lacking to a substantial degree the regular arrangement of atoms of the lattice structure of the adjacent portions of said substrate.
Claim 20
Independent Claim
101 words
A method for permanently modifying in the extent of a predetermined zone the phase velocity of elastic surface waves propagated along the surface of a crystalline substrate, said method comprising the steps of: making an ion implanted layer within the extent of said predetermined zone by selectively directing a beam of accelerated ions toward said surface, and varying the accelerating potential of said ions in the course of the implanting for producing an unburied zone having a permanently modified structure lacking to a substantial degree the regular arrangement of atoms of the lattice structure of the adjacent portions of said substrate.
Claim 21
Dependent Claim
19 words
A method as claimed in claim 18, wherein said ions are selected amongst the elements helium, lithium, and beryllium.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |