US4812702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excitation coil for hid electrodeless discharge lamp
Assignee: General Electric Co
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Filing: 1987-12-28
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Granted: 1989-03-14
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Expires: 2007-12-28
Abstract
Abstract An excitation coil, for stimulating a high-intensity-discharge plasma in an electrodeless discharge lamp, has at least one turn of a conductor arranged generally upon the surface of a toroid with a rhomboid or V-shaped cross-section, which is substantially symmetrical about a plane passing through the maxima of the toroid. The major radius of the coil is such that the lamp is insertable into the coil so that the coil induces a co-planar toroid plasma discharge arc in the lamp, when the coil is connected to a radio frequency (RF) power source.
Inventors
- 👤 M. John Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:36
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
52 words
An excitation coil, for stimulating a high intensity discharge plasma in an electrodeless discharge lamp, comprising: at least one turn of a conductor arranged generally upon an exterior surface of a torus having a substantially V-shaped cross-section; and means for tuning the inductance of the toroidal conductor to a desired resonance frequency.
Claim 2
Dependent Claim
52 words
An excitation coil, for stimulating a high intensity discharge plasma in an electrodeless discharge lamp, comprising: at least one turn of a conductor arranged generally upon an exterior surface of a torus having a substantially V-shaped cross-section; and means for tuning the inductance of the toroidal conductor to a desired resonance frequency.
Claim 3
Dependent Claim
20 words
The coil of claim 1, further comprising means for matching the impedance of the toroidal conductor to a desired impedance.
Claim 4
Dependent Claim
14 words
The coil of claim 2, wherein the impedance matching means includes the tuning means.
Claim 5
Dependent Claim
26 words
The coil of claim 1, wherein the cross-section of the torus form is substantially symmetrical about a plane passing through the maxima of the conductor torus.
Claim 6
Dependent Claim
17 words
The coil of claim 4, wherein the conductor torus includes a plurality N of turns of conductor.
Claim 7
Dependent Claim
7 words
The coil of claim 5, wherein N=8.
Claim 8
Dependent Claim
28 words
The coil of claim 5, wherein the slanted surfaces of the cross-section of the torus, if extended, appear to merge substantially at the geometric center of the coil.
Claim 9
Dependent Claim
16 words
The coil of claim 5, wherein the coil contains a substantially integer number N of turns.
Claim 10
Dependent Claim
28 words
The coil of claim 8, wherein the slanted surfaces of the cross-section of the torus, if extended, appear to merge substantially at the geometric center of the coil.
Claim 11
Dependent Claim
27 words
The coil of claim 9, wherein the midpoint of the coil conductor is located interior of the angle formed by the slanted surfaces of the coil cross-section.
Claim 12
Dependent Claim
31 words
The coil of claim 4, wherein each slanted cross-sectional surface of the coil is at an angle, with respect to said plane, of at least 10° and not more than 80°.
Claim 13
Dependent Claim
13 words
The coil of claim 1, wherein the coil contains a plurality of turns.
Claim 14
Dependent Claim
17 words
The coil of claim 12, wherein the spacing between turns is substantially equal at all turns positions.
Claim 15
Dependent Claim
24 words
The coil of claim 12, further comprising a ground plane electrically connected to at least one point along the length of the coil conductor.
Claim 16
Dependent Claim
19 words
The coil of claim 14, wherein the ground plane is connected substantially to the midpoint of the coil conductor.
Claim 17
Dependent Claim
12 words
The coil of claim 1, wherein the conductor has a round cross-sectional.
Claim 18
Dependent Claim
10 words
The coil of claim 16, wherein the conductor is hollow.
Claim 19
Dependent Claim
54 words
A lamp, comprising: an HID tube having an exterior surface; and an excitation coil positioned adjacent to said tube exterior surface for producing a discharge arc plasma in the tube, said coil having at least one turn of a conductor arranged generally upon an exterior surface of a torus having a substantially V-shaped cross-section.
Claim 20
Dependent Claim
54 words
A lamp, comprising: an HID tube having an exterior surface; and an excitation coil positioned adjacent to said tube exterior surface for producing a discharge arc plasma in the tube, said coil having at least one turn of a conductor arranged generally upon an exterior surface of a torus having a substantially V-shaped cross-section.
Claim 21
Dependent Claim
28 words
The lamp of claim 18, wherein the slanted surfaces of the cross-section of the torus appear to merge at a point within the envelope of the HID tube.
Claim 22
Dependent Claim
21 words
The lamp of claim 19, wherein the merge point appears to be substantially at the center of the discharge arc plasma.
References Cited (Backward Citations)
JPS4815840B1
Cited
US3763392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |