US3555311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure piezoelectric transducer
Assignee: Marquardt Corp
•
Filing: 1969-01-23
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Granted: 1971-01-12
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Expires: 1989-01-23
Abstract
Abstract An alternating voltage is applied to the electrodes of a piezoelectric crystal at the frequency of natural vibration of the crystal in the thickness mode which causes the crystal to vibrate in the thickness mode. This vibration is at one-half wavelength resonance. Vibrations from the front surface are transmitted through an epoxy window as an ultrasonic wave. Vibrations off the back surface are reflected from a reflector which is spaced one-quarter wavelength from the crystal. A filler material with negligible reflective qualities, such as neoprene, synthetic or natural rubbers, or the like, is sandwiched between the crystal and the reflective material. The filler also has the properties of compressions so that the crystal will not break or cave in when the transducer is subject to high pressures when submerged in very deep water.
Inventors
- 👤 Peter E Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:07
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0662; B06B1/0677
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
16 words
The apparatus as defined in claim 1 wherein said transducer being encapsulated in an epoxy material.
Claim 2
Dependent Claim
53 words
The transducer as defined in claim 1 and further comprising a pair of electrode means protruding from said housing and wherein one of said electrodes is coupled to the top surface of said ultrasonic energy emitting means and the other electrode is coupled to the bottom surface of said ultrasonic energy emitting means.
Claim 3
Dependent Claim
13 words
The apparatus as defined in claim 1 wherein said filler means being neoprene.
Claim 4
Dependent Claim
15 words
The transducer as defined in claim 1 wherein said filler means being a pliable plastic.
Claim 5
Dependent Claim
13 words
The transducer as defined in claim 1 wherein said filler being an elastomer.
Claim 6
Dependent Claim
14 words
The transducer as defined in claim 1 wherein said filler being an isoprene butylene.
Claim 7
Dependent Claim
20 words
The transducer as defined in claim 1 wherein said means for emitting a frequency vibration wave being a piezoelectric crystal.
Claim 8
Dependent Claim
15 words
The transducer as defined in claim 1 wherein said reflective means being comprised of brass.
Claim 9
Dependent Claim
29 words
The transducer as defined in claim 1 wherein: said means for emitting frequency vibrations being a piezoelectric crystal; said reflective means being brass; and said filler means being neoprene.
Claim 10
Dependent Claim
122 words
A transducer comprising: a piezoelectric crystal having a front surface and a back surface and including electrodes coupled to the back surface and front surface of said crystal for causing said crystal to vibrate in the thickness mode when energized with an electric energy, said crystal being of a thickness and characteristics to resonate at one-half wavelength; a means disposed adjacent the back surface of said crystal and being spaced therefrom by one-fourth wavelength of the vibrations of said crystal for reflecting vibrations of said crystal back to said crystal for transmission from only the front surface thereof; and a filler means disposed between said crystal and said reflecting means, said filler means being comprised of an acoustic and pressure absorbing material.
Claim 11
Dependent Claim
21 words
The transducer as defined in claim 11 wherein said filler is composed of a material which being a solid compressible material.
Claim 12
Dependent Claim
29 words
The transducer as defined in claim 12 wherein said filler is selected from the group consisting of neoprene, natural rubber, synthetic rubber, cork, plastic, compressed sponge, and isoprene butylene.
Claim 13
Dependent Claim
19 words
The transducer as defined in claim 11 wherein said reflective means being a metallic substance with an acoustic reflectivity.
Claim 14
Dependent Claim
13 words
The transducer as defined in claim 11 wherein said reflective means being brass.
Claim 15
Dependent Claim
14 words
The transducer as defined in claim 11 wherein said transducer being encapsulated in epoxy.
Claim 16
Dependent Claim
220 words
A transducer comprising: a metallic housing; a piezoelectric crystal being capable of vibrating in the thickness mode for emitting ultrasonic vibrations on the front surface and back surface thereof, said crystal being of a predetermined thickness and characteristic to resonate at one-half wavelength; a pair of electrodes protruding from said housing and being coupled to the back surface and the front surface of said crystal for causing said crystal to vibrate in the thickness mode thereof when energized with electric energy; a first means disposed adjacent the back surface of said crystal and being spaced therefrom by one-fourth wavelength for reflecting vibrations of said crystal back to said crystal for transmission from only the front surface thereof; a first filler means disposed between said crystal and said reflecting means, said first filler means being comprised of a pressure absorbing material; a second means disposed adjacent the back surface of said first means and being spaced from said first means by one-fourth wavelength of reflecting vibrations passed by said first means back to said crystal for tRansmission from only the front surface thereof; and a second filler disposed between said crystal and said reflecting means, said second filler means being comprised of a pressure absorbing material. 18 The transducer as defined in claim 17, wherein said filler being comprised of neoprene.
Claim 17
Dependent Claim
21 words
The transducer as defined in claim 17, wherein said first means and second means being comprised of a metallic reflective material.
Claim 18
Dependent Claim
15 words
The transducer as defined in claim 19, wherein said reflective material being comprised of brass.
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |