Patent US4267534A successfully refreshed from Google Patents.
US4267534A
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Surface acoustic wave reflectors with weighted arrays of segmented and non-segmented lineal elements
Assignee: Unisys Corp
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Filing: 1980-05-23
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Granted: 1981-05-12
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Expires: 2000-05-23
Abstract
Abstract Preferred reflective surface wave processors employ cooperating serially disposed reflector sections. At least one reflecting section comprises an array of non-segmented reflecting grooves in which certain grooves are omitted to form a withdrawal array. Cooperatively coupled to this non-segmented array is an array of segmented grooves. The elements of the segmented array may be made up of progressively fewer segments in regularly spaced lines. The segments in any one segmented line may selectively be of equal lengths randomly spaced within a given line.
Inventors
- 👤 William J. Tanski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:33
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; H03H9/6489; H03H9/6493; H03H9/02; H03H9/02535; H03H9/02637; H03H9/02685; H03H9/02771
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
171 words
Apparatus for reflecting an acoustic surface wave comprising: a substrate for supporting a surface acoustic wave at a surface thereof, first and second reflector sections in side-by-side parallel cooperative relation affixed at said surface, said first reflector section including a plurality of lineal reflector elements extending in spaced parallel relation across the path of said acoustic surface wave for reflecting a first portion thereof, said second reflector section including a plurality of segmented reflector elements extending normal to said path, each in parallel relation with said lineal reflector elements, for cooperatively reflecting substantially the total of the remainder of said surface wave, said first reflector section being modified according to a predetermined reflectivity function by the absence of predetermined ones of said lineal reflector elements at predetermined locations therein, the number of segments in said segmented reflector elements progressing from a predetermined maximum in the segmented reflector element adjacent said first reflector section to a single segment element most remote from said first reflector section according to said predetermined reflectivity function.
Claim 2
Dependent Claim
171 words
Apparatus for reflecting an acoustic surface wave comprising: a substrate for supporting a surface acoustic wave at a surface thereof, first and second reflector sections in side-by-side parallel cooperative relation affixed at said surface, said first reflector section including a plurality of lineal reflector elements extending in spaced parallel relation across the path of said acoustic surface wave for reflecting a first portion thereof, said second reflector section including a plurality of segmented reflector elements extending normal to said path, each in parallel relation with said lineal reflector elements, for cooperatively reflecting substantially the total of the remainder of said surface wave, said first reflector section being modified according to a predetermined reflectivity function by the absence of predetermined ones of said lineal reflector elements at predetermined locations therein, the number of segments in said segmented reflector elements progressing from a predetermined maximum in the segmented reflector element adjacent said first reflector section to a single segment element most remote from said first reflector section according to said predetermined reflectivity function.
Claim 3
Dependent Claim
53 words
Apparatus as described in claim 1 wherein said first and second reflector sections are so disposed and adjusted as to provide substantially a cos (πx/2L) reflectivity characteristic, where x is the position along the array of a predetermined reflector element and L is the combined length of the first and second reflector sections.
Claim 4
Dependent Claim
35 words
Apparatus as described in claim 1 wherein the transition from said first to said second reflector section is made where |Γ| Loc ., the local reflectivity at a successive lineal reflector element, is substantially 0.4.
Claim 5
Dependent Claim
22 words
Apparatus as described in claim 3 wherein |Γ| Loc . in the second reflector section progresses from substantially 0.4 to substantially 0.0.
Claim 6
Dependent Claim
29 words
Apparatus as described in claim 3 wherein each segmented reflector element contains a number of segmented elements proportional to the desired local reflectivity |Γ| Loc . of that element.
Claim 7
Dependent Claim
28 words
Apparatus as described in claim 3 wherein the lineal reflector element at the input of said first reflector section has a local reflectivity |Γ| Loc . of unity.
Claim 8
Dependent Claim
27 words
Apparatus as described in claim 1 wherein said segments of said segmented reflector elements are randomly distributed within aligned equal bins of each said segmented reflector element.
Claim 9
Dependent Claim
13 words
Apparatus as described in claim 7 wherein said segments are of equal length.
Claim 10
Dependent Claim
14 words
Apparatus as described in claim 7 wherein said segments comprise grooves in said substrate.
Claim 11
Dependent Claim
20 words
Apparatus as described in claim 9 wherein said grooves are λ o /4 wide and are λ o /2 longitudinally.
Claim 12
Dependent Claim
21 words
Apparatus as described in claim 10 wherein said grooves are arranged in non-contacting relation and are longitudinally disposed across said path.
Claim 13
Dependent Claim
20 words
Apparatus as described in claim 1 additionally including a third reflector section at the input of said first reflector section.
Claim 14
Dependent Claim
43 words
Apparatus as described in claim 12 wherein said third reflector section includes a plurality of segmented reflector elements extending normal to said path, each in parallel relation with said lineal reflector elements, for minimizing the undesired formation of bulk waves within said substrate.
Claim 15
Dependent Claim
28 words
Apparatus as described in claim 13 wherein each said third reflector segmented reflector element contains a number of segmented elements proportional to the desired reflectivity of that element.
References Cited (Backward Citations)
US4206426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |