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Patent US4115832A successfully refreshed from Google Patents.
US4115832A
Expired / Lapsed
US
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Igniter utilizing a negative resistance light emitting diode
Assignee: Sharp Corp
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Filing: 1976-12-15
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Granted: 1978-09-19
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Expires: 1996-12-15
Abstract
Abstract An oscillator utilizing a negative resistance light emitting semiconductor diode is connected in series with voltage booster means which in turn provides a high voltage to electrodes of a gas igniter. Discharge of the gas between the electrodes occurs with the aid of the high voltage derived from the voltage booster means to thereby effect an ignition of the gas. Light emission from the diode in the absence of gas ignition is indicative of a deficiency in the supply of gas, while the absence of light emission in the absence of gas ignition is indicative of a deficiency in the operation of the oscillator circuit.
Inventors
- 👤 Tutomu Nakamura
- 👤 Junichiro Shigemasa
- 👤 Zenpei Tani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:20
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57; F; F23; F23Q; F23Q3/00; F23Q3/004
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
237 words
An igniter circuit for a gaseous material having means for indicating a deficiency in the quantity of gaseous material or a deficiency in the operation of said circuit comprising: a. a voltage source for supplying energy to said igniter circuit; b. a negative resistance light emitting diode having a predetermined threshold voltage and selectable conductive and nonconductive states, said diode emitting light in said conductive state when the voltage applied across said diode exceeds said predetermined threshold voltage; c. capacitor means connected in parallel with said diode and coupled to said voltage source to receive a charging current therefrom when said diode is in said nonconductive state, said capacitor means switching said diode to said conductive state when said capacitor means is charged to at least said predetermined threshold voltage to thereby discharge said capacitor means through said diode; d. means for generating a voltage for electrically igniting said gaseous material in response to the discharge of said capacitor means through said diode; and e. means for transmitting the light emitted from said diode to an observation point externally of said circuit; whereby the presence of light emission from said diode and the absence of ignition of said gaseous material is indicative of a deficiency in the quantity of gaseous material, while the absence of light emission and the absence of ignition of gaseous material is indicative of a deficiency in the operation of said ignition circuit.
Claim 2
Dependent Claim
237 words
An igniter circuit for a gaseous material having means for indicating a deficiency in the quantity of gaseous material or a deficiency in the operation of said circuit comprising: a. a voltage source for supplying energy to said igniter circuit; b. a negative resistance light emitting diode having a predetermined threshold voltage and selectable conductive and nonconductive states, said diode emitting light in said conductive state when the voltage applied across said diode exceeds said predetermined threshold voltage; c. capacitor means connected in parallel with said diode and coupled to said voltage source to receive a charging current therefrom when said diode is in said nonconductive state, said capacitor means switching said diode to said conductive state when said capacitor means is charged to at least said predetermined threshold voltage to thereby discharge said capacitor means through said diode; d. means for generating a voltage for electrically igniting said gaseous material in response to the discharge of said capacitor means through said diode; and e. means for transmitting the light emitted from said diode to an observation point externally of said circuit; whereby the presence of light emission from said diode and the absence of ignition of said gaseous material is indicative of a deficiency in the quantity of gaseous material, while the absence of light emission and the absence of ignition of gaseous material is indicative of a deficiency in the operation of said ignition circuit.
Claim 3
Dependent Claim
45 words
An igniter circuit as set forth in claim 1, wherein said means for generating a voltage for igniting said gaseous material comprises a voltage boosting transformer having a primary winding connected in series with said diode and a secondary winding connected with ignition electrode means.
Claim 4
Dependent Claim
16 words
An igniter circuit as set forth in claim 1, wherein said voltge source is a battery.
Claim 5
Dependent Claim
18 words
An igniter circuit as set forth in claim 1, wherein said voltage source is a blocking oscillator circuit.
Claim 6
Dependent Claim
33 words
An igniter circuit as set forth in claim 1, further including a housing surrounding said circuit and said means for transmitting comprises a window in said housing in optical alignment with said diode.
References Cited (Backward Citations)
GB1077959A
Cited
US3349284A
Cited
US3609747A
Cited
US3757174A
Cited
US3824432A
Cited
US4005343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |