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US4240003A
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Apparatus and method for suppressing mass/spring mode in acoustic imaging transducers
Assignee: HP Inc
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Filing: 1979-03-12
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Granted: 1980-12-16
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Expires: 1999-03-12
Abstract
Abstract Spurious emissions caused by a newly-described vibration mode in an acosutic imaging transducer are suppressed by cancelling the net displacement of the center of mass of each piezoelectric element in the transducer array.
Inventors
- 👤 John D. Larson, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:40
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/002; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/064
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
An acoustic imaging transducer comprising: an acoustic absorbing backing; and a plurality of piezoelectric elements affixed to a surface of the backing for radiating and receiving acoustic waves, each of said elements including suppression means for suppressing spurious acoustic waves produced by mass/spring mode vibration.
Claim 2
Dependent Claim
45 words
An acoustic imaging transducer comprising: an acoustic absorbing backing; and a plurality of piezoelectric elements affixed to a surface of the backing for radiating and receiving acoustic waves, each of said elements including suppression means for suppressing spurious acoustic waves produced by mass/spring mode vibration.
Claim 3
Dependent Claim
27 words
An acoustic imaging transducer as in claim 1 wherein the suppression means includes a second layer of piezoelectric material and a second layer of electrically conductive material.
Claim 4
Dependent Claim
92 words
An acoustic imaging transducer as in claim 2 wherein each of said elements for radiating acoustic waves has a first layer of piezoelectric material affixed to the backing, a first layer of electrically conductive material affixed to the first layer of piezoelectric material, the second layer of piezoelectric material affixed to the first layer of electrically conductive material, and the second layer of electrically conductive material affixed to the second layer of piezoelectric material, the first and second layers of piezoelectric material being electrically coupled such that both layers are energized simultaneously.
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |