US3719907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torsional wave transducer
Assignee: Zenith Electronics LLC
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Filing: 1971-12-03
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Granted: 1973-03-06
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Expires: 1991-12-03
Abstract
Abstract A torsional-wave transducer is particularly suitable for use with torsional-mode delay lines. The transducer preferably takes the form of a washer-like annular disc of ferro-electric material which is electrically poled concentrically of the disc in two opposing directions. A unitary electrode is bonded to and overlies one end face of the disc. A pair of spaced driving electrodes are bonded to the opposite end face of the disc. In combination, a torsional-mode delay line in the form of an elongate hollow cylindrical tube has a pair of the transducers individually bonded to its respective opposite ends by the corresponding single electrodes. To make each transducer, a pair of narrow poling electrodes are first affixed to diametrically opposed locations on the disc, and a DC voltage then is applied across those poling electrodes. The latter are subsequently removed following which the unitary and driving electrodes are bonded in place.
Inventors
- 👤 R Adler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:03
CPC Classifications
G; G01; G01H; G01H1/00; G01H1/10; H; H03; H03H; H03H9/00; H03H9/02; H03H9/125
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
The method of making a torsional-wave transducer comprising the steps of: bonding a pair of poling electrodes to a disc of ferro-electric material at spaced diametrically opposed sectors on said disc of comparatively small circumferential extent; applying a DC voltage across said poling electrodes to pole said disc circumferentially in mutually opposing directions in diametrically opposing halves of the disc; removing said poling electrodes; bonding a pair of exciting electrodes to one end face of said disc at spaced symmetrically disposed locations thereon; and bonding a unitary electrode to the other end face of said disc.
Claim 2
Independent Claim
96 words
The method of making a torsional-wave transducer comprising the steps of: bonding a pair of poling electrodes to a disc of ferro-electric material at spaced diametrically opposed sectors on said disc of comparatively small circumferential extent; applying a DC voltage across said poling electrodes to pole said disc circumferentially in mutually opposing directions in diametrically opposing halves of the disc; removing said poling electrodes; bonding a pair of exciting electrodes to one end face of said disc at spaced symmetrically disposed locations thereon; and bonding a unitary electrode to the other end face of said disc.
Claim 3
Independent Claim
96 words
The method of making a torsional-wave transducer comprising the steps of: bonding a pair of poling electrodes to a disc of ferro-electric material at spaced diametrically opposed sectors on said disc of comparatively small circumferential extent; applying a DC voltage across said poling electrodes to pole said disc circumferentially in mutually opposing directions in diametrically opposing halves of the disc; removing said poling electrodes; bonding a pair of exciting electrodes to one end face of said disc at spaced symmetrically disposed locations thereon; and bonding a unitary electrode to the other end face of said disc.
Claim 4
Independent Claim
96 words
The method of making a torsional-wave transducer comprising the steps of: bonding a pair of poling electrodes to a disc of ferro-electric material at spaced diametrically opposed sectors on said disc of comparatively small circumferential extent; applying a DC voltage across said poling electrodes to pole said disc circumferentially in mutually opposing directions in diametrically opposing halves of the disc; removing said poling electrodes; bonding a pair of exciting electrodes to one end face of said disc at spaced symmetrically disposed locations thereon; and bonding a unitary electrode to the other end face of said disc.
Claim 5
Dependent Claim
40 words
The method as defined in claim 1 in which said disc is of annular shape, and which includes the additional step of submerging said disc, during the application of said voltage, in a liquid medium presenting a high dielectric constant.
Claim 6
Dependent Claim
26 words
The method as defined in claim 2 in which said poling electrodes each constitute at least substantially a ring surrounding a radial cross-section of said disc.
Claim 7
Dependent Claim
95 words
A torsional wave transducer comprising: 2 disc of ferro-electric material of a thickness producing a shear wave resonance at a predetermined operating frequency, having flat parallel end faces with a major portion of each half of said disc being electrically poled circumferentially in mutually opposing directions in diametrically opposing portions of the disc; a pair of electrodes bonded to one end face of said disc and symmetrically spaced on opposite sides of an imaginary diametrical line on said end face; and a unitary electrode bonded to and overlying the other end face of said disc.
Claim 8
Dependent Claim
95 words
A torsional wave transducer comprising: 2 disc of ferro-electric material of a thickness producing a shear wave resonance at a predetermined operating frequency, having flat parallel end faces with a major portion of each half of said disc being electrically poled circumferentially in mutually opposing directions in diametrically opposing portions of the disc; a pair of electrodes bonded to one end face of said disc and symmetrically spaced on opposite sides of an imaginary diametrical line on said end face; and a unitary electrode bonded to and overlying the other end face of said disc.
Claim 9
Dependent Claim
22 words
A transducer as defined in claim 4 in which said disc is of annular shape, having a concentrically located circular bore therethrough.
Claim 10
Dependent Claim
128 words
A torsional-wave delay line comprising: an elongate cylindrical body propagative of torsional-mode waves; a pair of circular discs, each having a thickness producing shear wave resonance at a predetermined frequency, of ferro-electric material with each being electrically poled circumferentially in mutually opposing directions in diametrically opposing halves of the disc; first and second electrode pairs individually bonded to respective one end faces of said discs with the electrodes of each pair disposed in registry with said diametrically opposed halves of the disc; first and second unitary electrodes individually bonded to and overlying the respective other end faces of said discs; and means for effectively bonding said discs individually to the respective opposite ends of said body with said unitary electrodes individually engaging the respective ends of said body.
Claim 11
Dependent Claim
128 words
A torsional-wave delay line comprising: an elongate cylindrical body propagative of torsional-mode waves; a pair of circular discs, each having a thickness producing shear wave resonance at a predetermined frequency, of ferro-electric material with each being electrically poled circumferentially in mutually opposing directions in diametrically opposing halves of the disc; first and second electrode pairs individually bonded to respective one end faces of said discs with the electrodes of each pair disposed in registry with said diametrically opposed halves of the disc; first and second unitary electrodes individually bonded to and overlying the respective other end faces of said discs; and means for effectively bonding said discs individually to the respective opposite ends of said body with said unitary electrodes individually engaging the respective ends of said body.
References Cited (Backward Citations)
US2742614A
Cited
US2838696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |