US3634652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic temperature control circuit in a high-frequency heating apparatus
Assignee: Tokai Rika Co Ltd
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Filing: 1969-08-19
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Granted: 1972-01-11
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Expires: 1989-08-19
Abstract
Abstract An automatic temperature control circuit in a high-frequency heating apparatus comprising a differential amplifier circuit receiving at one of its input terminals signals from a temperature-setting voltage circuit and at another input terminal signals from a thermister provided with a heating needle which contacts with a load to be heated and amplifying the difference between said two signals, and a voltage control circuit taking said amplified difference of signals and controlling a power voltage in a high-frequency amplitude control circuit. A highfrequency power amplifier circuit in the heating apparatus is thereby controlled so that the temperature of the heating needle at its contact point with the load can be kept under a predetermined degree of temperature.
Inventors
- 👤 Tetsuji Shimizu
- 👤 Hajime Sumida
- 👤 Sinichi Ueno
- 👤 Susumu Usami
- 👤 Sinzi Tatematu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:00
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906; G05D23/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
An automatic temperature control circuit for high-frequency heating apparatus provided with a pointed member for heating a load at its contact point with the load, and having a thermistor for detecting the temperature at said contact point, which comprises a high-frequency power amplifier having its output connected to said member to effect the heating thereof, a temperature-setting voltage circuit for setting the desired temperature at said contact point, a differential amplifier circuit having one input terminal connected to receive signals from said temperature-setting voltage circuit and another input terminal connected to receive signals from said thermistor and operative to amplify the difference between said signals, and a voltage control circuit for applying the amplified signals from said differential amplifier circuit to the input of said power amplifier to adjust the output voltage of said power amplifier to keep the heating member at its contact point with the load at said desired temperature.
Claim 2
Dependent Claim
152 words
An automatic temperature control circuit for high-frequency heating apparatus provided with a pointed member for heating a load at its contact point with the load, and having a thermistor for detecting the temperature at said contact point, which comprises a high-frequency power amplifier having its output connected to said member to effect the heating thereof, a temperature-setting voltage circuit for setting the desired temperature at said contact point, a differential amplifier circuit having one input terminal connected to receive signals from said temperature-setting voltage circuit and another input terminal connected to receive signals from said thermistor and operative to amplify the difference between said signals, and a voltage control circuit for applying the amplified signals from said differential amplifier circuit to the input of said power amplifier to adjust the output voltage of said power amplifier to keep the heating member at its contact point with the load at said desired temperature.
Claim 3
Dependent Claim
162 words
A completely automatically thermocontrol apparatus for performing an operation on cerebrum by high-frequency heat-solidification, which comprises a heating needle having an electrode, a high-frequency oscillating circuit, a power amplifier connected to said electrode to supply power thereto for heating said needle, an output voltage control circuit connecting said power amplifier to said oscillating circuit, said electrode being located at a pointed end of said heating needle and having inside thereof a heat-sensitive element, a temperature determining circuit, a comparing circuit, said heat-sensitive element and said temperature determining circuit each having voltage outputs connected to said comparing circuit, and a direct current amplifier circuit for amplifying the comparative differential voltage of said comparing circuit, and having its output connected to said output voltage control circuit, said voltage control circuit being operative to adjust the input to said power amplifier in accordance with the amplitude of said differential voltage, thereby to control the output of said power amplifier in proportion to said differential voltage.
Claim 4
Dependent Claim
162 words
A completely automatically thermocontrol apparatus for performing an operation on cerebrum by high-frequency heat-solidification, which comprises a heating needle having an electrode, a high-frequency oscillating circuit, a power amplifier connected to said electrode to supply power thereto for heating said needle, an output voltage control circuit connecting said power amplifier to said oscillating circuit, said electrode being located at a pointed end of said heating needle and having inside thereof a heat-sensitive element, a temperature determining circuit, a comparing circuit, said heat-sensitive element and said temperature determining circuit each having voltage outputs connected to said comparing circuit, and a direct current amplifier circuit for amplifying the comparative differential voltage of said comparing circuit, and having its output connected to said output voltage control circuit, said voltage control circuit being operative to adjust the input to said power amplifier in accordance with the amplitude of said differential voltage, thereby to control the output of said power amplifier in proportion to said differential voltage.
Claim 5
Dependent Claim
109 words
An apparatus as claimed in claim 2, which further comprises an output transformer for said high-frequency oscillating circuit having a terminal on one of its coils connected to the output of said voltage control circuit, a transistor interposed between the output terminal of said high-frequency oscillating circuit and said transformer, said transistor being connected at its base to said output terminal, a bias circuit connecting said base with said terminal on said one coil of the output transformer, a pair of resistors connected in series in said bias circuit, and in parallel with a condenser connected at one side between said resistors and at its opposite side to ground.
Claim 6
Dependent Claim
139 words
An automatic temperature control circuit in a high-frequency heating apparatus, comprising a high-frequency oscillator circuit, an output voltage control circuit connected to an output terminal of said high-frequency oscillator circuit; an electric power amplifier circuit connected to an output terminal of said output voltage control circuit; a heating member connected to an output terminal of said electric power amplifier circuit and having a contact point engageable with a load for heating said load, a heat-sensitive element for detecting the temperature of said contact point, a temperature-setting circuit for preselecting a desired operating temperature for said heating member, and a differEntial amplifier circuit connected to output terminals of said temperature-setting circuit and said heat-sensitive element, an output terminal of said differential amplifier circuit being connected to said output voltage control circuit to control the output of said high-frequency oscillator circuit.
Claim 7
Dependent Claim
139 words
An automatic temperature control circuit in a high-frequency heating apparatus, comprising a high-frequency oscillator circuit, an output voltage control circuit connected to an output terminal of said high-frequency oscillator circuit; an electric power amplifier circuit connected to an output terminal of said output voltage control circuit; a heating member connected to an output terminal of said electric power amplifier circuit and having a contact point engageable with a load for heating said load, a heat-sensitive element for detecting the temperature of said contact point, a temperature-setting circuit for preselecting a desired operating temperature for said heating member, and a differEntial amplifier circuit connected to output terminals of said temperature-setting circuit and said heat-sensitive element, an output terminal of said differential amplifier circuit being connected to said output voltage control circuit to control the output of said high-frequency oscillator circuit.
Claim 8
Dependent Claim
102 words
An automatic temperature control circuit in a high-frequency heating apparatus as claimed in claim 4, which further comprises a high-frequency voltage control circuit having a transistor whose base is connected to said output terminal of said high-frequency oscillator circuit, an output transformer having a first terminal on one of its coils connected to said transistor and further connected to an output terminal of said output voltage control circuit; two resistors connected in series between the base of said transistor and the junction of said transformer and said output voltage control circuit, and a condenser connected to the junction of said two resistors.
Claim 9
Dependent Claim
44 words
An automatic temperature control circuit in a high-frequency heating apparatus as claimed in claim 4, wherein said temperature setting circuit has a time constant circuit for gradually increasing the output voltage of said setting circuit according to the charging characteristic curve of a condenser.
Claim 10
Dependent Claim
32 words
An automatic temperature control circuit in a high-frequency heating apparatus as claimed in claim 4, wherein said heating member is a heating needle for an operation on the cerebrum by high-frequency heat-coagulation.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |