US3984705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High power remote control ultrasonic transmitter
Assignee: RCA Licensing Corp
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Filing: 1975-05-23
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Granted: 1976-10-05
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Expires: 1995-05-23
Abstract
Abstract A wide bandwidth, high gain ultrasonic frequency transducer drive circuit utilizes a relatively low voltage source of supply voltage. A first signal path from a source of drive signals includes circuitry resonant with the transducer for providing a relatively high signal voltage across this transducer. A second signal path from the source of drive signals includes a resonant circuit mutually coupled to the first resonant circuit for inducing signal energy into the first path and increasing the signal voltage across the transducer.
Inventors
- 👤 John Barrett George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:19
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0269; B06B2201/00; B06B2201/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
207 words
In an ultrasonic transmitter for generating ultrasonic frequency signals and having a capacitive type of output transducer, apparatus for providing signal energy to said transducer comprising: an oscillator for generating ultrasonic frequency signals; squaring means coupled to said oscillator for providing output signals having substantially first and second voltage states; a first current conducting means coupled to said squaring means and responsive to signals of said first voltage state for providing current flow to said transducer; a second current conducting means coupled to said squaring means and responsive to signals of said second voltage state for causing current flow from said transducer; a first resonant circuit including at least a first inductor coupled between said transducer and said first and second current conducting means, said first inductor tuned with respect to the capacitance of said transducer to be resonant at a frequency greater than the highest frequency output provided by said oscillator; and a second resonant circuit including at least a second inductor coupled to said first and second current conducting means, said second inductor tuned to be resonant at a frequency greater than that of said first resonant circuit, said second inductor being magnetically coupled to said first inductor to increase signal voltage across said transducer.
Claim 2
Dependent Claim
207 words
In an ultrasonic transmitter for generating ultrasonic frequency signals and having a capacitive type of output transducer, apparatus for providing signal energy to said transducer comprising: an oscillator for generating ultrasonic frequency signals; squaring means coupled to said oscillator for providing output signals having substantially first and second voltage states; a first current conducting means coupled to said squaring means and responsive to signals of said first voltage state for providing current flow to said transducer; a second current conducting means coupled to said squaring means and responsive to signals of said second voltage state for causing current flow from said transducer; a first resonant circuit including at least a first inductor coupled between said transducer and said first and second current conducting means, said first inductor tuned with respect to the capacitance of said transducer to be resonant at a frequency greater than the highest frequency output provided by said oscillator; and a second resonant circuit including at least a second inductor coupled to said first and second current conducting means, said second inductor tuned to be resonant at a frequency greater than that of said first resonant circuit, said second inductor being magnetically coupled to said first inductor to increase signal voltage across said transducer.
Claim 3
Dependent Claim
65 words
Apparatus according to claim 1 including: a first diode interposed between said first current conducting means and said first resonant circuit, in a direction for passing current from said current conducting means to said first resonant circuit; and a second diode interposed between said second current conducting means and said first resonant circuit, in a direction for carrying current away from said first resonant circuit.
Claim 4
Dependent Claim
65 words
Apparatus according to claim 2 including: a third diode interposed between said first current conducting means and said second resonant circuit for passing current from said first current conducting means to said second resonant circuit; and a fourth diode interposed between said second current conducting means and said second resonant circuit for passing current from said second resonant circuit to said second current conducting means.
Claim 5
Dependent Claim
42 words
Apparatus according to claim 3 including: a voltage multiplier responsive to said signals from said squaring means for providing a direct current, bias voltage to said transducer; and means bypassing said multiplier for passing signals from said squaring means to said transducer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |