US5083065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting device for electric discharge lamp
Assignee: Nissan Motor Co Ltd
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Filing: 1990-10-19
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Granted: 1992-01-21
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Expires: 2010-10-19
Abstract
Abstract A lighting device for an electric discharge lamp comprises an LC series resonant circuit, and control means for controlling an inverter circuit. Immediately after the occurrence of a dielectric breakdown in the electric discharge lamp. AC voltage with a relatively low frequency is applied to the lamp so as to pass a heavy current therethrough. Subsequently, the frequency is increased stepwise by a relatively small variation until a terminal voltage of the electric discharge lamp reaches a predetermined value. Thereafter, the frequency is increased stepwise by a relatiely large variation until the electric discharge lamp assumes a discharge stable state.
Inventors
- 👤 Masao Sakata
- 👤 Toru Segoshi
- 👤 Tohru Futami
- 👤 Yoichi Iijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:46
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/382; H05B41/386; H05B41/26; H05B41/28; H05B41/288; H05B41/2881; H05B41/2882; H05B41/2883; H05B41/2885; H05B41/2887; Y; Y02; Y02B; Y02B20/00; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A method of starting an electric discharge lamp bulb until the electric discharge lamp bulb assumes a predetermined discharge stable state, comprising the steps of: supplying electric power to the electric discharge lamp bulb; detecting a terminal voltage across the electric discharge lamp bulb; determining whether said terminal voltage is greater than a predetermined value; increasing a frequency of said electric power by a first frequency value when it is determined that said terminal voltage is greater than said predetermined value; and increasing said frequency of said electric power by a second frequency value when it is determined that said terminal voltage fails to be greater than said predetermined value.
Claim 2
Independent Claim
110 words
A method of starting an electric discharge lamp bulb until the electric discharge lamp bulb assumes a predetermined discharge stable state, comprising the steps of: supplying electric power to the electric discharge lamp bulb; detecting a terminal voltage across the electric discharge lamp bulb; determining whether said terminal voltage is greater than a predetermined value; increasing a frequency of said electric power by a first frequency value when it is determined that said terminal voltage is greater than said predetermined value; and increasing said frequency of said electric power by a second frequency value when it is determined that said terminal voltage fails to be greater than said predetermined value.
Claim 3
Dependent Claim
19 words
A method as claimed in claim 1, wherein said second frequency value is smaller than said first frequency value.
Claim 4
Independent Claim
127 words
A system for starting an electric discharge lamp bulb until the electric discharge lamp bulb assumes a predetermined discharge stable state, comprising: a source of electric power, said electric power being supplied to the electric discharge lamp bulb; means for detecting a terminal voltage across the electric discharge lamp bulb; and a control unit including: means for determining whether said terminal voltage is greater than a predetermined value; means for increasing a frequency of said electric power by a first frequency value when it is determined that said terminal voltage is greater than said predetermined value; and means for increasing said frequency of said electric power by a second frequency value when it is determined that said terminal voltage fails to be greater than said predetermined value.
Claim 5
Independent Claim
127 words
A system for starting an electric discharge lamp bulb until the electric discharge lamp bulb assumes a predetermined discharge stable state, comprising: a source of electric power, said electric power being supplied to the electric discharge lamp bulb; means for detecting a terminal voltage across the electric discharge lamp bulb; and a control unit including: means for determining whether said terminal voltage is greater than a predetermined value; means for increasing a frequency of said electric power by a first frequency value when it is determined that said terminal voltage is greater than said predetermined value; and means for increasing said frequency of said electric power by a second frequency value when it is determined that said terminal voltage fails to be greater than said predetermined value.
Claim 6
Dependent Claim
19 words
A system as claimed in claim 3, wherein said second frequency value is smaller than said first frequency value.
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) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |