US3851209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge lamp starting apparatus
Assignee: Shindengen Electric Manufacturing Co Ltd
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Filing: 1973-02-06
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Granted: 1974-11-26
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Expires: 1993-02-06
Abstract
Abstract A discharge lamp starting apparatus comprising a hot cathode start fluorescent discharge lamp having a cathode at each end thereof, a pulse generating circuit consisting of a pulse transformer connected to one of the cathodes of the discharge lamp and having a primary winding and a secondary winding, a first capacitor, a first bi-directional diode thyristor and a resistor, a circuit portion for increasing preheating current to the cathodes including a diode and a second capacitor which are connected in parallel with a circuit of the first bi-directional diode thyristor and the resistor, and a second bi-directional diode thyristor adapted to be turned off upon operation of the discharge tube and connected between the diode, the resistor and the second capacitor, on one hand, and the other cathode of the discharge tube, on the other hand.
Inventors
- 👤 T Murakami
- 👤 Y Niguchi
- 👤 K Nishimura
- 👤 Y Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:42
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/02; H05B41/04; H05B41/042; H05B41/044; Y; Y10; Y10S; Y10S315/00; Y10S315/02; Y10S315/05
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A starting apparatus for a hot cathode start fluorescent discharge lamp having a cathode at each end, said starting apparatus being connected in series with said cathodes and comprising: a. a pulse generating circuit including a pulse transformer having a primary winding and a secondary winding coupled to one of the cathodes of said fluorescent discharge lamp, a first capacitor and a first bi-directional diode thyristor connected in series across the ends of the primary winding of said pulse transformer, and a resistor having one end thereof connected to the junction of said first capacitor and said first thyristor; b. a diode having one end connected to one end of the primary winding of said pulse transformer; c. a second capacitor having one end connected to the other end of said primary winding; and d. a second bi-directional diode thyristor connected between the other ends of said resistor, diode and second capacitor and the other cathode of said fluorescent discharge lamp.
Claim 2
Dependent Claim
161 words
A starting apparatus for a hot cathode start fluorescent discharge lamp having a cathode at each end, said starting apparatus being connected in series with said cathodes and comprising: a. a pulse generating circuit including a pulse transformer having a primary winding and a secondary winding coupled to one of the cathodes of said fluorescent discharge lamp, a first capacitor and a first bi-directional diode thyristor connected in series across the ends of the primary winding of said pulse transformer, and a resistor having one end thereof connected to the junction of said first capacitor and said first thyristor; b. a diode having one end connected to one end of the primary winding of said pulse transformer; c. a second capacitor having one end connected to the other end of said primary winding; and d. a second bi-directional diode thyristor connected between the other ends of said resistor, diode and second capacitor and the other cathode of said fluorescent discharge lamp.
Claim 3
Dependent Claim
33 words
A discharge lamp starting apparatus according to claim 1 wherein said second capacitor is connected in parallel with a series circuit of said first capacitor and said resistor in said pulse generating circuit.
Claim 4
Dependent Claim
39 words
A discharge lamp starting apparatus according to claim 2, wherein a second resistor is connected in parallel with said second capacitor connected in parallel with the series circuit of said first capacitor and resistor in said pulse generating circuit.
Claim 5
Dependent Claim
186 words
A starting apparatus for a hot cathode start fluorescent discharge lamp having a cathode at each end, said starting apparatus being connected in series with said cathodes and comprising: a. a pulse generating circuit including a pulse transformer having a winding including primary and secondary portions coupled to one of the cathodes of said fluorescent discharge lamp, a first capacitor having one end thereof connected to the junction between the primary and secondary portions of the winding of said pulse transformer, a first bi-directional diode thyristor having one end thereof connected to the other end of said primary winding, and a resistor having one end thereof connected to the other ends of said first capacitor and first bi-directional diode thyristor; b. a diode and second capacitor connected in parallel, one end of said parallel combination being connected to the junction between the primary and secondary portions of the winding of said pulse transformer; and c. a second bi-directional diode thyristor connected between the other ends of said resistor and parallel combination of said diode and said capacitor and the other cathode of said fluorescent discharge lamp.
Claim 6
Dependent Claim
186 words
A starting apparatus for a hot cathode start fluorescent discharge lamp having a cathode at each end, said starting apparatus being connected in series with said cathodes and comprising: a. a pulse generating circuit including a pulse transformer having a winding including primary and secondary portions coupled to one of the cathodes of said fluorescent discharge lamp, a first capacitor having one end thereof connected to the junction between the primary and secondary portions of the winding of said pulse transformer, a first bi-directional diode thyristor having one end thereof connected to the other end of said primary winding, and a resistor having one end thereof connected to the other ends of said first capacitor and first bi-directional diode thyristor; b. a diode and second capacitor connected in parallel, one end of said parallel combination being connected to the junction between the primary and secondary portions of the winding of said pulse transformer; and c. a second bi-directional diode thyristor connected between the other ends of said resistor and parallel combination of said diode and said capacitor and the other cathode of said fluorescent discharge lamp.
References Cited (Backward Citations)
US3644780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |