Patent US3716751A successfully refreshed from Google Patents.
US3716751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starter device for a discharge lamp
Assignee: Panasonic Holdings Corp
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Filing: 1969-05-05
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Granted: 1973-02-13
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Expires: 1989-05-05
Abstract
Abstract A starter device for a discharge lamp instantaneously lighting a preheating type fluorescent discharge tube where in parallel to the said fluorescent discharge tube is connected a reverse blocking diode thyristor, the breakover voltage being lower than the maximum value of the rated voltage of the power source but higher than the discharge voltage of the said fluorescent discharge tube while the blocking voltage being sufficiently larger than the said breakover voltage.
Inventors
- 👤 T Takei
- 👤 Y Kawai
- 👤 T Matsushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:54
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/02; H05B41/04; H05B41/042; H05B41/044
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
Apparatus, including a circuit for starting a fluorescent discharge tube, comprising: an AC power source; a fluorescent discharge tube connected across said AC source and having first and second opposed filaments; reverse blocking diode thyristor means connected between a first terminal of each of said filaments of said discharge tube, said thyristor means having a blocking voltage which is higher than the maximum rated output voltage of said AC source and a breakover voltage which is lower than said maximum rated voltage and higher than the peak value of the operating voltage of said discharge tube; switch means connected between one side of said AC source and a second terminal of said first filament; current limiting means connected between the other side of said AC source and a second terminal of said second filament; and capacitor means connected across said AC source.
Claim 2
Dependent Claim
142 words
Apparatus, including a circuit for starting a fluorescent discharge tube, comprising: an AC power source; a fluorescent discharge tube connected across said AC source and having first and second opposed filaments; reverse blocking diode thyristor means connected between a first terminal of each of said filaments of said discharge tube, said thyristor means having a blocking voltage which is higher than the maximum rated output voltage of said AC source and a breakover voltage which is lower than said maximum rated voltage and higher than the peak value of the operating voltage of said discharge tube; switch means connected between one side of said AC source and a second terminal of said first filament; current limiting means connected between the other side of said AC source and a second terminal of said second filament; and capacitor means connected across said AC source.
Claim 3
Dependent Claim
142 words
Apparatus, including a circuit for starting a fluorescent discharge tube, comprising: an AC power source; a fluorescent discharge tube connected across said AC source and having first and second opposed filaments; reverse blocking diode thyristor means connected between a first terminal of each of said filaments of said discharge tube, said thyristor means having a blocking voltage which is higher than the maximum rated output voltage of said AC source and a breakover voltage which is lower than said maximum rated voltage and higher than the peak value of the operating voltage of said discharge tube; switch means connected between one side of said AC source and a second terminal of said first filament; current limiting means connected between the other side of said AC source and a second terminal of said second filament; and capacitor means connected across said AC source.
Claim 4
Dependent Claim
142 words
Apparatus, including a circuit for starting a fluorescent discharge tube, comprising: an AC power source; a fluorescent discharge tube connected across said AC source and having first and second opposed filaments; reverse blocking diode thyristor means connected between a first terminal of each of said filaments of said discharge tube, said thyristor means having a blocking voltage which is higher than the maximum rated output voltage of said AC source and a breakover voltage which is lower than said maximum rated voltage and higher than the peak value of the operating voltage of said discharge tube; switch means connected between one side of said AC source and a second terminal of said first filament; current limiting means connected between the other side of said AC source and a second terminal of said second filament; and capacitor means connected across said AC source.
Claim 5
Dependent Claim
53 words
Apparatus according to claim 1, further comprising: a symmetrical diode thyristor and a starting capacitor connected in series between said second terminals of said first and second filaments, said symmetrical diode thyristor having a breakover voltage lower than said maximum rated output voltage and higher than said peak operating voltage of said tube.
Claim 6
Dependent Claim
16 words
Apparatus according to claim 2, wherein said thyristor means comprises a single reverse blocking diode thyristor.
Claim 7
Dependent Claim
36 words
Apparatus according to claim 2, wherein said thyristor means comprises a series connection of a symmetrical diode thyristor and a diode, said symmetrical diode thyristor having said breakover voltage and said diode having said blocking voltage.
Claim 8
Dependent Claim
54 words
Apparatus according to claim 2, wherein said thyristor means comprises a series connection of a reverse blocking diode thyristor and a diode, said reverse blocking diode thyristor having said breakover voltage and a blocking voltage nearly equal to said breakover voltage, and said diode having a blocking voltage higher than the power source voltage.
Claim 9
Dependent Claim
133 words
Apparatus, including a circuit for starting a fluorescent discharge tube, comprising: an AC source; a fluorescent discharge tube having opposed filaments and connected across said AC source; reverse blocking diode thyristor means connected directly across said filaments and across said AC source, said thyristor means having a blocking voltage which is higher than the maximum rated output voltage of said AC source and a breakover voltage which is lower than said maximum rated voltage and higher than the peak value of the operating voltage of said discharge tube; switch means connected between one side of said AC source and a terminal of one of said filaments; current limiting means connected between the other side of said AC source and a terminal of the other filament; and capacitor means connected across said AC source.
Claim 10
Dependent Claim
133 words
Apparatus, including a circuit for starting a fluorescent discharge tube, comprising: an AC source; a fluorescent discharge tube having opposed filaments and connected across said AC source; reverse blocking diode thyristor means connected directly across said filaments and across said AC source, said thyristor means having a blocking voltage which is higher than the maximum rated output voltage of said AC source and a breakover voltage which is lower than said maximum rated voltage and higher than the peak value of the operating voltage of said discharge tube; switch means connected between one side of said AC source and a terminal of one of said filaments; current limiting means connected between the other side of said AC source and a terminal of the other filament; and capacitor means connected across said AC source.
Claim 11
Dependent Claim
16 words
Apparatus according to claim 6, wherein said thyristor means comprises a single reverse blocking diode thyristor.
Claim 12
Dependent Claim
141 words
Apparatus according to claim 6, wherein said thyristor means comprises a series connection of a symmetrical diode thyristor and a diode, said symmetrical diode thyristor having the breakover voltage lower than said maximum rated output voltage of said AC source and higher than said peak value of the operating voltage of the discharge tube, and said diode has a blocking voltage higher than said maximum rated output voltage. 9. Apparatus according to claim 6 wherein said thyristor means comprises a series connection of a reverse blocking diode thyristor and a diode, said diode thyristor having the breakover voltage lower than said maximum rated voltage of said AC source and higher than said peak value of said operating voltage and having a blocking voltage nearly equal to said breakover voltage, said diode having a blocking voltage higher than the power source voltage.
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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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |