US3644780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starting device for discharge lamp including semiconductors preheating and starting circuits
Assignee: Panasonic Holdings Corp
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Filing: 1969-12-22
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Granted: 1972-02-22
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Expires: 1989-12-22
Abstract
Abstract A discharge lamp starter device which comprises a serial circuit constituted by a reverse blocking diode thyristor or a bilateral diode thyristor and a diode, the breakdown voltage VBO of the thyristor being lower than the rated source voltage but higher than the terminal voltage of a fluorescent discharge tube while the blocking voltage VR of the thyristor having a sufficiently great value with respect to the breakdown voltage VBO, and a pulse generator circuit constituted by a pulse transformer, a capacitor and a bilateral diode thyristor, the two circuits being connected in parallel with the fluorescent discharge tube to thereby instantaneously start the fluorescent discharge tube.
Inventors
- 👤 Shigeo Koyama
- 👤 Motohiro Ohtsuki
- 👤 Kenji Shimatani
- 👤 Masao Yasuda
- 👤 Toru Takei
- 👤 Yasutaka Kawai
- 👤 Takeshi Matsushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:38
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/02; H05B41/04; H05B41/042; H05B41/044; Y; Y10; Y10S; Y10S315/00; Y10S315/05
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
A starting device for a discharge lamp having a pair of cathodes comprising a source circuit connected across said pair of cathodes and including a series connection of an AC power source and a ballast element, a preheating circuit connected across said pair of cathodes so as to form a loop circuit through said pair of cathodes in cooperation with said source circuit, said preheating circuit permitting a current therethrough only when a voltage higher than a predetermined value is applied across said preheating circuit in a given direction, and a starting circuit including a pulse transformer whose secondary winding is connected in parallel with said preheating circuit through a first capacitor and whose primary winding is connected in parallel with said first capacitor through a bilateral diode.
Claim 2
Dependent Claim
128 words
A starting device for a discharge lamp having a pair of cathodes comprising a source circuit connected across said pair of cathodes and including a series connection of an AC power source and a ballast element, a preheating circuit connected across said pair of cathodes so as to form a loop circuit through said pair of cathodes in cooperation with said source circuit, said preheating circuit permitting a current therethrough only when a voltage higher than a predetermined value is applied across said preheating circuit in a given direction, and a starting circuit including a pulse transformer whose secondary winding is connected in parallel with said preheating circuit through a first capacitor and whose primary winding is connected in parallel with said first capacitor through a bilateral diode.
Claim 3
Dependent Claim
23 words
A starting device according to claim 1, wherein said preheating circuit includes a reverse block diode thyristor connected across said pair of cathodes.
Claim 4
Dependent Claim
33 words
A starting device according to claim 1, wherein said preheaTing circuit includes a series connection of a bilateral diode thyristor and a diode, said series connection being connected across said pair of cathodes.
Claim 5
Dependent Claim
46 words
A starting device according to claim 1, wherein said secondary winding of said pulse transformer is connected in parallel with said preheating circuit through said first capacitor and through a parallel circuit including a second capacitor and a resistor connected in parallel with said second capacitor.
Claim 6
Dependent Claim
23 words
A starting device according to claim 4, wherein said preheating circuit includes a reverse blocking diode thyristor connected across said pair of diodes.
Claim 7
Dependent Claim
27 words
A starting device according to claim 4, wherein said preheating circuit includes a reverse blocking diode thyristor connected across said pair of cathodes through a blocking coil.
Claim 8
Dependent Claim
28 words
A starting device according to claim 6, wherein said parallel circuit further includes a diode connected in series with said resistor and in parallel with said second capacitor.
Claim 9
Dependent Claim
33 words
A starting device according to claim 4, wherein said preheating circuit includes a series connection of a bilateral diode thyristor and a diode, said series connection being connected across said pair of cathodes.
Claim 10
Dependent Claim
36 words
A starting device according to claim 4, wherein said preheating circuit includes a series connection of a bilateral diode thyristor, a diode and a blocking coil, said series connection being connected across said pair of cathodes.
Claim 11
Dependent Claim
28 words
A starting device according to claim 9, wherein said parallel circuit further includes a diode connected in series with said resistor and in parallel with said second capacitor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |