US4277758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic wave generating apparatus with voltage-controlled filter
Assignee: Taga Electric Co Ltd
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Filing: 1979-08-09
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Granted: 1981-07-07
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Expires: 1999-08-09
Abstract
Abstract The present invention deals with an ultrasonic wave generating apparatus with voltage controlled filter, comprising a phase comparator which detects a shifted value from a predetermined phase difference between a driving voltage or a driving current of an ultrasonic transducer and a vibratory velocity signal, and a voltage-controlled band-pass filter which is controlled by the output of the phase comparator and which is provided in a feedback loop from the vibratory velocity signal to an input of a driving amplifier of the ultrasonic transducer, wherein the oscillating frequency is changed while following the resonant frequency of the ultrasonic transducer, so that stable operation is materialized without developing abnormal oscillation in subresonant frequencies and permitting very small following error.
Inventors
- 👤 Shoji Mishiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:11
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02; B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0238; B06B1/0246; B06B1/0253; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/323; B06B2201/00; B06B2201/50; B06B2201/57
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
An ultrasonic wave generating apparatus comprising: ultrasonic transducer means for producing ultrasonic waves and a vibratory velocity signal; driving amplifier means for driving said ultrasonic transducer means; phase comparator means for comparing the output of said driving amplifier means with the said vibratory velocity signal for detecting a shifted value from a predetermined phase difference and producing a phase difference signal in response thereto; a voltage controlled band-pass filter means, said phase difference signal controlling said voltage controlled band-pass filter means; said voltage controlled band-pass filter means being directly connected to said vibratory velocity signal in a feedback loop.
Claim 2
Dependent Claim
99 words
An ultrasonic wave generating apparatus comprising: ultrasonic transducer means for producing ultrasonic waves and a vibratory velocity signal; driving amplifier means for driving said ultrasonic transducer means; phase comparator means for comparing the output of said driving amplifier means with the said vibratory velocity signal for detecting a shifted value from a predetermined phase difference and producing a phase difference signal in response thereto; a voltage controlled band-pass filter means, said phase difference signal controlling said voltage controlled band-pass filter means; said voltage controlled band-pass filter means being directly connected to said vibratory velocity signal in a feedback loop.
Claim 3
Dependent Claim
21 words
An ultrasonic wave generating apparatus according to claim 1, wherein said voltage controlled band-pass filter means is a bridged T filter.
Claim 4
Dependent Claim
115 words
An ultrasonic wave generating apparatus comprising: ultrasonic transducer means for producing ultrasonic waves and a vibratory velocity signal; driving amplifier means for driving said ultrasonic transducer means; a voltage to current converter inserted between said ultrasonic transducer means and said driving amplifier means; phase comparator means for comparing the output of said driving amplifier means with the said vibratory velocity signal for detecting a shifted value from a predetermined phase difference and producing a phase difference signal in response thereto; a voltage controlled band-pass filter means, said phase difference signal controlling said voltage controlled band-pass filter means; said voltage controlled band-pass filter means being directly connected to said vibratory velocity signal in a feedback loop.
Claim 5
Dependent Claim
115 words
An ultrasonic wave generating apparatus comprising: ultrasonic transducer means for producing ultrasonic waves and a vibratory velocity signal; driving amplifier means for driving said ultrasonic transducer means; a voltage to current converter inserted between said ultrasonic transducer means and said driving amplifier means; phase comparator means for comparing the output of said driving amplifier means with the said vibratory velocity signal for detecting a shifted value from a predetermined phase difference and producing a phase difference signal in response thereto; a voltage controlled band-pass filter means, said phase difference signal controlling said voltage controlled band-pass filter means; said voltage controlled band-pass filter means being directly connected to said vibratory velocity signal in a feedback loop.
Claim 6
Dependent Claim
20 words
An ultrasonic wave generating apparatus according to claim 3, wherein said voltage-controlled band-pass filter means is a bridged T filter.
Claim 7
Dependent Claim
19 words
An ultrasonic wave generating apparatus according to claim 3 or 4, wherein said ultrasonic transducer is an electro-strictive transducer.
References Cited (Backward Citations)
US2752512A
Cited
US2917691A
Cited
US3889166A
Cited
US3931533A
Cited
US3967143A
Cited
US3975650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |