US3689783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic transducer with half-wave separator between piezoelectric crystal means
Assignee: Individual
•
Filing: 1971-03-11
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Granted: 1972-09-05
•
Expires: 1991-03-11
Abstract
Abstract An ultrasonic transducer comprises metal front and rear masses, two piezoelectric crystal means sandwiched therebetween, and a thick metal separator nearly one half wavelength thick between the crystal means to provide improved cooling by conduction of heat from the crystals. The transducer should have a length equal to a multiple of half wavelengths, and at least two half wavelengths, from end to end. A horn having a length equal to one half wavelength can comprise a part of the transducer, in which case the transducer length equals three half wavelengths.
Inventors
- 👤 David A Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:35
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0611; B06B1/0618
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
In an ultrasonic transducer comprising a metal front mass, a metal rear mass, two piezoelectric crystal means sandwiched between said masses, and a heat dissipating metal separator between and in contact with said two crystal means, the improvement wherein the length of said transducer is a multiple of half wavelengths, and at least two half wavelengths, from end to end thereof; wherein said crystal means are located at different nodal points one half wavelength apart; and wherein said metal separator is nearly one half wavelength thick thereby presenting substantial surface area for heat disposal so as to provide for cooler and consequently higher power operation.
Claim 2
Dependent Claim
105 words
In an ultrasonic transducer comprising a metal front mass, a metal rear mass, two piezoelectric crystal means sandwiched between said masses, and a heat dissipating metal separator between and in contact with said two crystal means, the improvement wherein the length of said transducer is a multiple of half wavelengths, and at least two half wavelengths, from end to end thereof; wherein said crystal means are located at different nodal points one half wavelength apart; and wherein said metal separator is nearly one half wavelength thick thereby presenting substantial surface area for heat disposal so as to provide for cooler and consequently higher power operation.
Claim 3
Dependent Claim
48 words
In an ultrasonic transducer in accordance with claim 1, a metal horn projecting from said front mass, said horn including a terminal portion of reduced diameter, said horn having a length equal to one half wavelength, said horn having a free end located at an anti nodal point.
Claim 4
Dependent Claim
17 words
In an ultrasonic transducer in accordance with claim 2, said metal separator being a unitary metal body.
Claim 5
Dependent Claim
22 words
In an ultrasonic transducer in accordance with claim 2, said metal separator comprising two aligned members formed of metals having different densities.
Claim 6
Dependent Claim
42 words
In an ultrasonic transducer in accordance with claim 2, said two crystal means each comprising a single crystal element, each crystal element having a positively polarized surface facing in the same direction as the positively polarized surface of the other crystal element.
Claim 7
Dependent Claim
63 words
In an ultrasonic transducer in accordance with claim 2, said two crystal means comprising first and second pairs of crystal elements, and first and second metal electrical conductors therebetween, respectively, the crystal elements of said first pair having positively polarized surfaces facing toward said first conductor, the crystal elements of said second pair having positively polarized surfaces facing away from said second conductor.
Claim 8
Dependent Claim
44 words
In an ultrasonic transducer in accordance with claim 6, said conductors being electrically connected together in parallel into one side of an electrical circuit, and said rear mass and said separator being electrically connected in parallel into the other side of said electrical circuit.
Claim 9
Dependent Claim
21 words
In an ultrasonic transducer in accordance with claim 2, said metal separator having a plurality of heat conductive fins projecting therefrom.
Claim 10
Dependent Claim
33 words
In an ultrasonic apparatus, a transducer in accordance with claim 2, a support housing enclosing said transducer, and means for blowing cooling gas into said housing and over the exterior of said transducer.
Claim 11
Dependent Claim
20 words
In an ultrasonic apparatus, a transducer in accordance with claim 8, and means for blowing cooling gas over said fins.
Claim 12
Dependent Claim
47 words
In an ultrasonic apparatus, a transducer in accordance with claim 2, a support housing enclosing said transducer, at least one perforate mounting plate means clamped between elements of said transducer at at least one nodal point, said mounting plate means being also fastened to said support housing.
Claim 13
Dependent Claim
118 words
In an ultrasonic transducer comprising a metal front mass, a metal rear mass, two piezoelectric crystal means sandwiched between said masses, and a heat dissipating metal separator between and in contact with said two crystal means, the improvement wherein the lEngth of said transducer is a multiple of half wavelengths, and at least two half wavelengths, from end to end thereof; wherein said crystal means are located at different nodal points one half wavelength apart and are polarized and arranged to expand and contract in opposite phase relationship; and wherein said metal separator is nearly one half wavelength thick thereby presenting substantial surface area for heat disposal so as to provide for cooler and consequently higher power operation.
Claim 14
Dependent Claim
118 words
In an ultrasonic transducer comprising a metal front mass, a metal rear mass, two piezoelectric crystal means sandwiched between said masses, and a heat dissipating metal separator between and in contact with said two crystal means, the improvement wherein the lEngth of said transducer is a multiple of half wavelengths, and at least two half wavelengths, from end to end thereof; wherein said crystal means are located at different nodal points one half wavelength apart and are polarized and arranged to expand and contract in opposite phase relationship; and wherein said metal separator is nearly one half wavelength thick thereby presenting substantial surface area for heat disposal so as to provide for cooler and consequently higher power operation.
Claim 15
Dependent Claim
50 words
In an ultrasonic transducer in accordance with claim 1 said crystal means being so polarized and so arranged relative to one another that when energized with high frequency alternating current, expansion of one crystal means occurs at the same time contraction of the other crystal means occurs, and vice versa.
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |