US5084654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starting aid for an electrodeless high intensity discharge lamp
Assignee: General Electric Co
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Filing: 1990-05-23
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Granted: 1992-01-28
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Expires: 2010-05-23
Abstract
Abstract A starting aid for an electrodeless high intensity discharge (HID) lamp comprises at least one starting electrode which, at least during lamp starting, is situated adjacent to, and preferably in contact with, the portion of the arc tube nearest the arc discharge and oriented so as to provide a capacitive starting current that flows in substantially the same location as the arc discharge, thereby easing the transition from a relatively low current glow discharge to a relatively high current, high intensity discharge. The starting aid comprises one or more conductors that substantially conform to the shape of the arc tube at least during initiation of the arc discharge. After the lamp is started, the starting aid may be moved to a predetermined location away from the arc tube. Alternatively, the starting aid may comprise one or more fixed starting electrodes. The starting aid may be coupled to the lamp ballast circuit used to drive the excitation coil either directly, or via an impedance network, or via the excitation coil. In an alternative embodiment, the starting aid is excited by a starting circuit that is separate and independent from, and operates at a substantially higher frequency than, the lamp ballast.
Inventors
- 👤 Sayed-Amr A. El-Hamamsy
- 👤 Victor D. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:11
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/18; H05B41/19; H05B41/24; H05B41/26; H05B41/28; H05B41/288; H05B41/2881; H05B41/36; H05B41/38; H05B41/382; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
120 words
A starting aid for an electrodeless high intensity discharge lamp which includes an excitation coil situated about an arc tube for exciting an arc discharge in an ionizable fill contained in said arc tube, comprising: at least one starting electrode being positioned, at least during initiation of the arc discharge, adjacent to the portion of said arc tube nearest the arc discharge to be initiated therein and oriented so as to provide a capacitive starting current in said arc tube that flows in substantially the same location as the arc discharge, said capacitive starting current and the arc discharge following substantially the same path in said arc tube; and means for coupling a radio frequency signal to said starting electrode.
Claim 2
Dependent Claim
120 words
A starting aid for an electrodeless high intensity discharge lamp which includes an excitation coil situated about an arc tube for exciting an arc discharge in an ionizable fill contained in said arc tube, comprising: at least one starting electrode being positioned, at least during initiation of the arc discharge, adjacent to the portion of said arc tube nearest the arc discharge to be initiated therein and oriented so as to provide a capacitive starting current in said arc tube that flows in substantially the same location as the arc discharge, said capacitive starting current and the arc discharge following substantially the same path in said arc tube; and means for coupling a radio frequency signal to said starting electrode.
Claim 3
Dependent Claim
27 words
The starting aid of claim 1 wherein the shape of said starting electrode substantially conforms to said arc tube at least during initiation of the arc discharge.
Claim 4
Dependent Claim
20 words
The starting aid of claim 2 wherein said starting electrode comprises a single conductor having at least one gap therein.
Claim 5
Dependent Claim
35 words
The starting aid of claim 2 wherein said starting aid comprises two conductors sufficiently separated so as not to cause breakdown of gas external to said arc tube between the ends of said two conductors.
Claim 6
Dependent Claim
31 words
The starting aid of claim 1, further comprising electrode moving means for moving said starting electrode to a predetermined location away from said arc tube after the arc discharge is initiated.
Claim 7
Dependent Claim
63 words
The starting aid of claim 5 wherein said electrode moving means comprises heat responsive means for moving said starting electrode to said predetermined location away from said arc tube upon receipt of heat energy from said arc tube, said heat responsive means moving said starting electrode back toward said arc tube upon sufficient reduction in receipt of heat energy from said arc tube.
Claim 8
Dependent Claim
15 words
The starting aid of claim 6 wherein said heat responsive means comprises bimetallic support means.
Claim 9
Dependent Claim
55 words
The starting aid of claim 5 wherein said electrode moving means comprises piezoelectric bender means for moving said starting electrode adjacent to said arc tube in response to a voltage stimulus, said piezoelectric bender means moving said starting electrode to said predetermined location away from said arc tube upon sufficient reduction in said voltage stimulus.
Claim 10
Dependent Claim
120 words
An electrodeless high intensity discharge lamp, comprising: a light-transmissive arc tube for containing a fill; an excitation coil disposed about said arc tube and coupled to a radio frequency power supply for exciting an arc discharge in said fill; at least one starting electrode being positioned, at least during initiation of the arc discharge, adjacent to the portion of said arc tube nearest the arc discharge and oriented so as to provide a capacitive starting current in said arc tube that flows in substantially the same location as the arc discharge, said capacitive starting current and the arc discharge following substantially the same path in said arc tube; and means for coupling a radio frequency signal to said starting electrode.
Claim 11
Dependent Claim
120 words
An electrodeless high intensity discharge lamp, comprising: a light-transmissive arc tube for containing a fill; an excitation coil disposed about said arc tube and coupled to a radio frequency power supply for exciting an arc discharge in said fill; at least one starting electrode being positioned, at least during initiation of the arc discharge, adjacent to the portion of said arc tube nearest the arc discharge and oriented so as to provide a capacitive starting current in said arc tube that flows in substantially the same location as the arc discharge, said capacitive starting current and the arc discharge following substantially the same path in said arc tube; and means for coupling a radio frequency signal to said starting electrode.
Claim 12
Dependent Claim
26 words
The lamp of claim 9 wherein the shape of said starting electrode substantially conforms to said arc tube at least during initiation of the arc discharge.
Claim 13
Dependent Claim
19 words
The lamp of claim 9 wherein said starting electrode comprises a single conductor having at least one gap therein.
Claim 14
Dependent Claim
34 words
The lamp of claim 9 wherein said starting aid comprises two conductors sufficiently separated so as not to cause breakdown of gas external to said arc tube between the ends of said two conductors.
Claim 15
Dependent Claim
30 words
The lamp of claim 9, further comprising electrode moving means for moving said starting electrode to a predetermined location away from said arc tube after the arc discharge is initiated.
Claim 16
Dependent Claim
57 words
The lamp of claim 13 wherein said electrode moving means comprises heat responsive means for moving said starting electrode to said predetermined location upon receipt of heat energy from said arc tube, said heat responsive means moving said starting electrode back toward said arc tube upon sufficient reduction in receipt of heat energy from said arc tube.
Claim 17
Dependent Claim
14 words
The lamp of claim 14 wherein said heat responsive means comprises bimetallic support means.
Claim 18
Dependent Claim
54 words
The lamp of claim 13 wherein said electrode moving means comprises piezoelectric bender means for moving said starting electrode adjacent to said arc tube in response to a voltage stimulus, said piezoelectric bender means moving said starting electrode to said predetermined location away from said arc tube upon sufficient reduction in said voltage stimulus.
Claim 19
Dependent Claim
32 words
The lamp of claim 9 wherein the radio frequency signal coupling means comprises means for coupling said starting electrode to said radio frequency power supply for providing said radio frequency signal thereto.
Claim 20
Dependent Claim
30 words
The lamp of claim 17 wherein said means for coupling said starting electrode to said radio frequency power supply comprises means for coupling said starting electrode to said excitation coil.
Claim 21
Dependent Claim
46 words
The lamp of claim 9 wherein said radio frequency signal coupling means comprises means for coupling said starting electrode to a second radio frequency power supply for providing said radio frequency signal to said starting electrode, said excitation coil and said starting electrode being separately excited.
Claim 22
Dependent Claim
31 words
The lamp of claim 9, further comprising an outer light transmissive envelope enclosing said arc tube, said excitation coil being situated outside said envelope in the vicinity of said arc tube.
References Cited (Backward Citations)
US4959582A
Cited
US4810938A
Cited
US4812702A
Cited
US4902937A
Cited
US4894590A
Cited
US4894589A
Cited
US4982140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |