Patent US3967143A successfully refreshed from Google Patents.
US3967143A
Expired / Lapsed
US
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Ultrasonic wave generator
Assignee: Oki Electric Industry Co Ltd
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Filing: 1974-10-10
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Granted: 1976-06-29
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Expires: 1994-10-10
Abstract
Abstract The ultrasonic wave generator of the present invention always drives a transducer with the resonant frequency f o of the transducer. Although the resonant frequency f o changes due to the temperature change etc., the driving frequency automatically follows the change of the resonant frequency f o . The control of the driving frequency is performed by means of a feed-back loop including a voltage controlled oscillator and means for applying a control signal to said voltage controlled oscillator according to the amplitude and/or phase of the driving signal of the transducer.
Inventors
- 👤 Akinori Watanabe
- 👤 Katsuhide Tanoshima
- 👤 Takao Ando
- 👤 Akira Tohama
- 👤 Akio Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:56
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0238; B06B1/0246; B06B1/0261; B06B1/0269; B06B1/0276; B06B2201/00; B06B2201/50; B06B2201/55
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
An ultrasonic wave generator comprising at least a transducer for generating an ultrasonic wave having at least a driving electrode and a detection electrode, a variable frequency oscillator whose output signal is applied to said driving electrode, and a slope detection circuit which detects the amplitude of the output signal of said detection electrode and controls the output frequency of said variable frequency oscillator for obtaining the maximum amplitude of output signal in said detection electrode.
Claim 2
Dependent Claim
76 words
An ultrasonic wave generator comprising at least a transducer for generating an ultrasonic wave having at least a driving electrode and a detection electrode, a variable frequency oscillator whose output signal is applied to said driving electrode, and a slope detection circuit which detects the amplitude of the output signal of said detection electrode and controls the output frequency of said variable frequency oscillator for obtaining the maximum amplitude of output signal in said detection electrode.
Claim 3
Dependent Claim
59 words
An ultrasonic wave generator according to claim 1, further comprising a binary counter connected between said slope detection circuit and said variable frequency oscillator, the status of said binary counter being changed when the output amplitude of said detection electrode is reduced, and said binary counter controlling the output frequency of said variable frequency oscillator through an integral circuit.
Claim 4
Dependent Claim
27 words
An ultrasonic wave generator according to claim 2, further comprising an oscillator whose output is connected to the input of said binary counter through an OR circuit.
Claim 5
Dependent Claim
156 words
An ultrasonic wave generator comprising at least a transducer for generating an ultrasonic wave; a voltage controlled oscillator whose output is connected to said transducer through an amplifier; a detection means having a series circuit of a current detector for detecting the driving current of said transducer, a rectifier for adjusting the output signal of said current detector and a band pass filter connected to the output of said rectifier; an analog adder whose output is connected to the input of said voltage controlled oscillator; a modulation wave oscillator connected to one input of said analog adder; a phase selection circuit which picks up the output of said detection means according to the output amplitude of said modulated wave oscillator; and a low pass filter, the input of which is connected to the output of said phase selection circuit, the output of said low pass filter being connected to the other input of said analog adder.
Claim 6
Dependent Claim
156 words
An ultrasonic wave generator comprising at least a transducer for generating an ultrasonic wave; a voltage controlled oscillator whose output is connected to said transducer through an amplifier; a detection means having a series circuit of a current detector for detecting the driving current of said transducer, a rectifier for adjusting the output signal of said current detector and a band pass filter connected to the output of said rectifier; an analog adder whose output is connected to the input of said voltage controlled oscillator; a modulation wave oscillator connected to one input of said analog adder; a phase selection circuit which picks up the output of said detection means according to the output amplitude of said modulated wave oscillator; and a low pass filter, the input of which is connected to the output of said phase selection circuit, the output of said low pass filter being connected to the other input of said analog adder.
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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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |