US3912969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge lamp lighting apparatus
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1974-04-11
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Granted: 1975-10-14
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Expires: 1994-04-11
Abstract
Abstract A discharge lamp lighting apparatus wherein a discharge lamp circuit is provided on the secondary side of a leakage transformer, the leakage transformer being arranged to produce a secondary voltage which is lower than the ordinary starting voltage of the discharge lamp. An auxiliary winding magnetically coupled with at least the secondary side winding of the leakage transformer is wound on an iron core, and a phase advancing current circuit is coupled to the auxiliary winding for raising the lamp voltage at turn-on to a level exceeding the starting voltage.
Inventors
- 👤 Kenichi Nakai
- 👤 Hiroshi Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:16
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232; H05B41/02; H05B41/04; H05B41/042; Y; Y10; Y10S; Y10S315/00; Y10S315/05
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A discharge lamp lighting apparatus comprising a leakage transformer including a secondary winding, an auxiliary winding maGnetically coupled with said secondary winding, and a current source winding common to said secondary and auxiliary windings, said auxiliary winding being wound on an iron core having a partly saturated characteristic, a discharge lamp connected in series with said secondary winding, the leakage transformer being wound so that the secondary winding produces a voltage which is lower than the starting voltage of the discharge lamp, and a phase advancing current circuit conductively coupling said auxiliary winding to said discharge lamp for increasing the lamp voltage to a level above said starting voltage to start the lamp.
Claim 2
Dependent Claim
113 words
A discharge lamp lighting apparatus comprising a leakage transformer including a secondary winding, an auxiliary winding maGnetically coupled with said secondary winding, and a current source winding common to said secondary and auxiliary windings, said auxiliary winding being wound on an iron core having a partly saturated characteristic, a discharge lamp connected in series with said secondary winding, the leakage transformer being wound so that the secondary winding produces a voltage which is lower than the starting voltage of the discharge lamp, and a phase advancing current circuit conductively coupling said auxiliary winding to said discharge lamp for increasing the lamp voltage to a level above said starting voltage to start the lamp.
Claim 3
Dependent Claim
20 words
The discharge lamp lighting apparatus as set forth in claim 1 wherein said phase advancing current circuit comprises a condenser.
Claim 4
Dependent Claim
72 words
The discharge lamp lighting apparatus as set forth in claim 1 wherein said phase advancing current circuit comprises a condenser conductively coupled between the discharge lamp and the auxiliary winding forming a first series circuit including the condenser and the discharge lamp, said apparatus further including a second series circuit comprising a second condenser and a second discharge lamp, said second series circuit being connected in parallel with the first series circuit.
Claim 5
Dependent Claim
35 words
The discharge lamp lighting apparatus as set forth in claim 3 further including a third condenser coupled in parallel with at least one of said first and second discharge lamps thereby to suppress electrical noise.
Claim 6
Dependent Claim
95 words
The discharge lamp lighting apparatus as set forth in claim 1 wherein said phase advancing current circuit comprises a condenser conductively coupled between said auxiliary winding and said discharge lamp and forming a first series circuit including the condenser and the discharge lamp, said apparatus further including a second series circuit comprising a second condenser and at least two discharge lamps, said second series circuit being connected in parallel with the first series circuit, said auxiliary winding being adapted to generate a voltage sufficient to start said two discharge lamps in the second series circuit.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |