US4075516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffraction electroacoustic transducer
Assignee: Hagiwara Electric Holdings Co Ltd
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Filing: 1976-05-20
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Granted: 1978-02-21
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Expires: 1996-05-20
Abstract
Abstract In a bulk piezoelectric crystal an arbitrary wavefront of an acoustic wave is reconstructed from an array of wavelets generated subjacent a set of interdigital electrodes on a surface of the crystal.
Inventors
- 👤 Shuzo Hattori
- 👤 Tadao Hiramatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:51
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; G; G02; G02F; G02F1/00; G02F1/29; G02F1/33; H; H10; H10N; H10N60/00; H10N60/80; H10N60/81
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
146 words
A diffraction electroacoustic transducer comprising: a piezoelectric crystal; a set of interdigital electrodes including a first plurality of metal strips and a second plurality of metal strips both provided on one surface of said crystal for producing an acoustic volume wave of a desired acoustic field within said crystal; and means for applying an AC voltage to said interdigital electrodes; said first plurality of metal strips of said interdigital electrodes positioned substantially along a first set of lines defined by the intersection of said one surface and a first set of equi-phase surfaces along a pre-specified wavefront defining the desired acoustic field; and said second plurality of metal strips of said interdigital electrodes positioned substantially along a second set of lines defined by the intersection of said one surface and a second set of equi-phase surfaces shifted π radians from said first set of equi-phase surfaces.
Claim 2
Dependent Claim
146 words
A diffraction electroacoustic transducer comprising: a piezoelectric crystal; a set of interdigital electrodes including a first plurality of metal strips and a second plurality of metal strips both provided on one surface of said crystal for producing an acoustic volume wave of a desired acoustic field within said crystal; and means for applying an AC voltage to said interdigital electrodes; said first plurality of metal strips of said interdigital electrodes positioned substantially along a first set of lines defined by the intersection of said one surface and a first set of equi-phase surfaces along a pre-specified wavefront defining the desired acoustic field; and said second plurality of metal strips of said interdigital electrodes positioned substantially along a second set of lines defined by the intersection of said one surface and a second set of equi-phase surfaces shifted π radians from said first set of equi-phase surfaces.
Claim 3
Dependent Claim
154 words
A diffraction electroacoustic transducer comprising: a piezoelectric crystal having a plane surface; a set of interdigital electrodes including a first plurality of metal strips and a second plurality of metal strips both provided on said plane surface of said crystal for producing an acoustic volume wave of a desired uniform acoustic field within said crystal; and means for applying an AC voltage to said interdigital electrodes; said first plurality of metal strips of said interdigital electrodes positioned substantially along a first set of lines defined by the intersection of said plane surface and a first set of equi-phase planes along a prespecified plane wavefront defining the desired uniform acoustic field; and said second plurality of metal strips of said interdigital electrodes positioned substantially along a second set of lines defined by the intersection of said plane surface and a second set of equi-phase planes shifted π radians from said first set of equi-phase planes.
Claim 4
Dependent Claim
154 words
A diffraction electroacoustic transducer comprising: a piezoelectric crystal having a plane surface; a set of interdigital electrodes including a first plurality of metal strips and a second plurality of metal strips both provided on said plane surface of said crystal for producing an acoustic volume wave of a desired uniform acoustic field within said crystal; and means for applying an AC voltage to said interdigital electrodes; said first plurality of metal strips of said interdigital electrodes positioned substantially along a first set of lines defined by the intersection of said plane surface and a first set of equi-phase planes along a prespecified plane wavefront defining the desired uniform acoustic field; and said second plurality of metal strips of said interdigital electrodes positioned substantially along a second set of lines defined by the intersection of said plane surface and a second set of equi-phase planes shifted π radians from said first set of equi-phase planes.
Claim 5
Dependent Claim
160 words
A diffraction electroacoustic transducer comprising: a piezoelectric crystal having a plane surface; a set of interdigital electrodes including a first plurality of metal strips and a second plurality of metal strips both provided on said plane surface of said crystal for producing an acoustic volume wave of a desired acoustic field focusing on a straight line within said crystal; and means for applying an AC voltage to said interdigital electrodes; said first plurality of metal strips of said interdigital electrodes positioned substantially along a first set of lines defined by the intersection of said plane surface and a first set of equi-phase cylindrical surfaces along a pre-specified cylindrical wavefront defining the desired acoustic field; and said second plurality of metal strips of said interdigital electrodes positioned substantially along a second set of lines defined by the intersection of said plane surface and a second set of equi-phase cylindrical surfaces shifted π radians from said first set of equi-phase cylindrical surfaces.
Claim 6
Dependent Claim
160 words
A diffraction electroacoustic transducer comprising: a piezoelectric crystal having a plane surface; a set of interdigital electrodes including a first plurality of metal strips and a second plurality of metal strips both provided on said plane surface of said crystal for producing an acoustic volume wave of a desired acoustic field focusing on a straight line within said crystal; and means for applying an AC voltage to said interdigital electrodes; said first plurality of metal strips of said interdigital electrodes positioned substantially along a first set of lines defined by the intersection of said plane surface and a first set of equi-phase cylindrical surfaces along a pre-specified cylindrical wavefront defining the desired acoustic field; and said second plurality of metal strips of said interdigital electrodes positioned substantially along a second set of lines defined by the intersection of said plane surface and a second set of equi-phase cylindrical surfaces shifted π radians from said first set of equi-phase cylindrical surfaces.
Claim 7
Dependent Claim
164 words
A diffraction electroacoustic transducer comprising: a piezoelectric crystal having a cylindrical surface; a set of interdigital electrodes including a first plurality of metal strips and a second plurality of metal strips both provided on said cylindrical surface of said crystal for producing an acoustic volume wave of a desired acoustic field focusing on a straight line within said crystal; and means for applying a voltage of said interdigital electrodes; said first plurality of metal strips of said interdigital electrodes positioned substantially along a first set of lines defined by the intersection of said cylindrical surface of said crystal and a first set of equi-phase clyindrical surfaces along a pre-specified cylindrical wavefront defining the desired acoustic field; and said second plurality of metal strips of said interdigital electrodes positioned substantially along a second set of lines defined by the intersection of said clyindrical surface of said crystal and a second set of equi-phase clyindrical surfaces shifted π-radians from said first set of equi-phase cylindrical surfaces.
Claim 8
Dependent Claim
164 words
A diffraction electroacoustic transducer comprising: a piezoelectric crystal having a cylindrical surface; a set of interdigital electrodes including a first plurality of metal strips and a second plurality of metal strips both provided on said cylindrical surface of said crystal for producing an acoustic volume wave of a desired acoustic field focusing on a straight line within said crystal; and means for applying a voltage of said interdigital electrodes; said first plurality of metal strips of said interdigital electrodes positioned substantially along a first set of lines defined by the intersection of said cylindrical surface of said crystal and a first set of equi-phase clyindrical surfaces along a pre-specified cylindrical wavefront defining the desired acoustic field; and said second plurality of metal strips of said interdigital electrodes positioned substantially along a second set of lines defined by the intersection of said clyindrical surface of said crystal and a second set of equi-phase clyindrical surfaces shifted π-radians from said first set of equi-phase cylindrical surfaces.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |