US3843897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supersonic transducer
Assignee: Taga Electric Co Ltd
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Filing: 1973-03-28
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Granted: 1974-10-22
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Expires: 1993-03-28
Abstract
Abstract A supersonic transducer including means for detecting its vibrating speed and for changing the frequency of the energizing current in response thereto. This invention utilizes the property that when an electrostrictive vibrator is vibrated resonantly, its dynamic admittance varies depending upon the difference in its stress distribution. The electrostrictive vibrator is divided into portions of large and small stresses to cancel the applied brake currents. Simultaneously, a signal is derived that is proportional to the difference of the dynamic currents so as to provide an effective energization by detecting the resonant frequency of the vibrator in order to automatically adjust the applied frequency of the supersonic transducer.
Inventors
- 👤 S Mishiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:55
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0207; B06B1/0223; B06B1/0238; B06B1/0246; B06B1/0261; G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; B06B2201/00; B06B2201/50; B06B2201/57; H; H04; H04R; H04R17/00; H04R17/04; H04R17/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
239 words
A supersonic transucer that vibrates in response to an applied electric signal comprising: an electrostrictive element having a pair of vibrating surfaces, a common electrode surface positioned adjacent one surface of said electrostrictive element, a positive electrode surface comprising a first and a second portion positioned adjacent the surface of said electrostrictive element opposite to said one surface, means for applying the common component of the signal to said common electrode surface and the positive component of the signal to the first and second portions of said positive electrode surface, the first portion of said positive electrode surface being positioned adjacent the section of said element which has a vibrating stress which is larger than an adjacent vibrating stress in said element, the second portion of said positive electrode surface being positioned adjacent the section of said element which has a vibrating stress which is smaller than an adjacent vibrating stress in said element, the surface area of said first portion being equal to the surface area of said second portion so that the brake admittance of said first portion is equal to the brake admittance of said second portion, means for detecting the difference between the dynamic admittance of the first portion and the dynamic admittance of the second portion, means for adjusting the frequency of the applied electric signal in response to the dynamic admittance of the first portion and the dynamic admittance of the second portion.
Claim 2
Dependent Claim
239 words
A supersonic transucer that vibrates in response to an applied electric signal comprising: an electrostrictive element having a pair of vibrating surfaces, a common electrode surface positioned adjacent one surface of said electrostrictive element, a positive electrode surface comprising a first and a second portion positioned adjacent the surface of said electrostrictive element opposite to said one surface, means for applying the common component of the signal to said common electrode surface and the positive component of the signal to the first and second portions of said positive electrode surface, the first portion of said positive electrode surface being positioned adjacent the section of said element which has a vibrating stress which is larger than an adjacent vibrating stress in said element, the second portion of said positive electrode surface being positioned adjacent the section of said element which has a vibrating stress which is smaller than an adjacent vibrating stress in said element, the surface area of said first portion being equal to the surface area of said second portion so that the brake admittance of said first portion is equal to the brake admittance of said second portion, means for detecting the difference between the dynamic admittance of the first portion and the dynamic admittance of the second portion, means for adjusting the frequency of the applied electric signal in response to the dynamic admittance of the first portion and the dynamic admittance of the second portion.
Claim 3
Dependent Claim
21 words
A supersonic transducer in accordance with claim 1, wherein the second portion of said positive electrode surface comprises two separate sections.
Claim 4
Dependent Claim
83 words
A supersonic transducer in accordance with claim 1, wherein said frequency adjusting means comprises: a differential current transformer for feeding the positive component of said applied signal to said positive electrode surface and detecting an output signal representative of the difference between the dynamic admittance of the first portion and the dynamic admittance of the second portion, a feedback oscillator for receiving said output signal from said differential current transformer and for adjusting the frequency of the applied electric signal in response thereto.
Claim 5
Dependent Claim
106 words
A supersonic transducer in accordance with claim 3, wherein said transformer comprises: a primary winding having two output wires, one of which is connected to said first portion of said positive electrode surface, the other of which is connected to said second portion, an intermediate tap for receiving the positive component of said applied electric signal of said feedback oscillator and feeding it to said primary winding, a secondary winding positioned to detect a voltage proportional to the difference in current in said two output wires of said primary winding, said secondary winding having two output wires connected to the input terminals of said feedback oscillator.
Claim 6
Dependent Claim
68 words
A supersonic transducer in accordance with claim 1, wherein said electrostrictive element comprises a circular disk, said common electrode surface is positioned on one major surface of said electrostrictive element, said positive electrode surface is divided into a centrally positioned circular portion and a ring-like portion surrounding said circular portion, said circular portion and said ring-like portion are positioned on the opposite major surface of said electrostrictive element.
Claim 7
Dependent Claim
74 words
A supersonic transducer in accordance with claim 1, wherein said electrostrictive element comprises a rectangular parallelepiped, said common electrode surface is positioned on one major surface of said electRostrictive element, said positive electrode surface is divided into one centrally positioned rectangular portion and two rectangular portions which are positioned adjacent said centrally positioned portion, the centrally positioned portion and the two rectangular portions are positioned on the opposite major surface of said electrostrictive element.
Claim 8
Dependent Claim
56 words
A supersonic transducer in accordance with claim 1, wherein said electrostrictive element comprises a hollow cylindrical tube, said common electrode surface is positioned on one major cylindrical surface, said positive electrode surface is positioned on the other major cylindrical surface and is divided into one centrally positioned cylindrical portion and at least two adjacent cylindrical portions.
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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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |