Patent US3781597A successfully refreshed from Google Patents.
US3781597A
Expired / Lapsed
US
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Lighting device for a discharge lamp
Assignee: Toshiba Corp
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Filing: 1972-11-28
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Granted: 1973-12-25
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Expires: 1992-11-28
Abstract
Abstract In a lighting device for a discharge lamp including a ballast inserted between an AC power source and a discharge lamp the ratio ZC/ZL of the capacitive impedance ZC to the inductive impedance ZL of the ballast is in the range of 1.9-2.8; the ratio VL/VS of the nominal lamp voltage VL of a discharge lamp to the unloaded voltage VS of a power source is in the range of 0.7-1.1; and when VL/VS is in the range of 1.0-1.1, the ratio VL/VS is so determined as to satisfy the equation:
Inventors
- 👤 O Nomura
- 👤 K Yajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:47
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A lighting device for a discharge lamp including a discharge lamp fed from an AC power source and a ballast arranged between the discharge lamp and the AC power source and including a capacitive impedance ZC and an inductive impedance ZL, in which a ratio ZC/ZL of the capacitive impedance ZC to the inductive impedance is in the range of 1.9-2.8; a ratio VL/VS of a nominal lamp voltage VL of the discharge lamp to an unloaded voltage VS of the power source is in the range of 0.7-1.1; and when the ratio VL/VS is in the range of 1.0-1.1 it satisfies the equation: ZC/ZL > OR = 9VL/VS-7.1.
Claim 2
Dependent Claim
109 words
A lighting device for a discharge lamp including a discharge lamp fed from an AC power source and a ballast arranged between the discharge lamp and the AC power source and including a capacitive impedance ZC and an inductive impedance ZL, in which a ratio ZC/ZL of the capacitive impedance ZC to the inductive impedance is in the range of 1.9-2.8; a ratio VL/VS of a nominal lamp voltage VL of the discharge lamp to an unloaded voltage VS of the power source is in the range of 0.7-1.1; and when the ratio VL/VS is in the range of 1.0-1.1 it satisfies the equation: ZC/ZL > OR = 9VL/VS-7.1.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |