Patent US4070602A successfully refreshed from Google Patents.
US4070602A
Expired / Lapsed
US
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Spatially distributed windings to improve plasma coupling in induction ionized lamps
Assignee: General Electric Co
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Filing: 1976-10-18
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Granted: 1978-01-24
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Expires: 1996-10-18
Abstract
Abstract The distribution of turns in the primary winding of an induction ionized discharge lamp varies as a function of angular position on a toroidal core. The turns are wound in proportion to the adjoining secondary plasma flux density. Local matching of flux linkages per ampere reduces leakage flux between the primary and secondary and thereby improves lamp coupling and reduces electromagnetic interference.
Inventors
- 👤 Armand P. Ferro
- 👤 Harold A. Gauper, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:41
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
159 words
In an induction ionized fluorescent lamp of the type comprising: an evacuable, light-transmissive envelope, a gaseous medium disposed within said envelope and capable of sustaining an electric discharge due to a varying magnetic field induced therein and to emit radiation at a first wavelength while sustaining said discharge, a luminous phosphor at least on the interior of said envelope capable of emitting visible light while being excited by said first wavelength radiation, a closed loop magnetic core with said gaseous medium disposed about said loop, and means for energizing said core with a varying magnetic field at radio frequency whereby said electric discharge is induced in said gaseous medium, the improvement wherein: said means for energizing said core comprises a multi-turn winding linking said core and connected for receipt of radio frequency electrical current, the spatial distribution of said winding on said core being proportional to current flow in said electric discharge in adjacent regions and said gaseous medium.
Claim 2
Dependent Claim
159 words
In an induction ionized fluorescent lamp of the type comprising: an evacuable, light-transmissive envelope, a gaseous medium disposed within said envelope and capable of sustaining an electric discharge due to a varying magnetic field induced therein and to emit radiation at a first wavelength while sustaining said discharge, a luminous phosphor at least on the interior of said envelope capable of emitting visible light while being excited by said first wavelength radiation, a closed loop magnetic core with said gaseous medium disposed about said loop, and means for energizing said core with a varying magnetic field at radio frequency whereby said electric discharge is induced in said gaseous medium, the improvement wherein: said means for energizing said core comprises a multi-turn winding linking said core and connected for receipt of radio frequency electrical current, the spatial distribution of said winding on said core being proportional to current flow in said electric discharge in adjacent regions and said gaseous medium.
Claim 3
Dependent Claim
47 words
The lamp of claim 1 wherein said magnetic core is a toroid and wherein the number of turns of said winding on a sector of said toroid is proportional to current flow in an adjacent sector of said gaseous medium disposed between said toroid and said envelope.
Claim 4
Dependent Claim
81 words
Apparatus for maintaining an electric discharge in a gaseous medium contained within an evacuable envelope comprising: a closed loop magnetic core centrally disposed with respect to said envelope; a multi-turn winding linking said core and adapted for energizing said core with a radio frequency magnetic field, the spatial distribution of said turns of said winding on said core being proportional to an adjacent current flow in said gaseous medium; and means for establishing a radio frequency electric current within said winding.
Claim 5
Dependent Claim
81 words
Apparatus for maintaining an electric discharge in a gaseous medium contained within an evacuable envelope comprising: a closed loop magnetic core centrally disposed with respect to said envelope; a multi-turn winding linking said core and adapted for energizing said core with a radio frequency magnetic field, the spatial distribution of said turns of said winding on said core being proportional to an adjacent current flow in said gaseous medium; and means for establishing a radio frequency electric current within said winding.
Claim 6
Dependent Claim
35 words
The apparatus of claim 3 wherein said core is a toroid and wherein the angular distribution of said turns on said toroid is proportional to current flow in an adjacent sector of said gaseous medium.
Claim 7
Dependent Claim
67 words
In apparatus for producing an electric current flow in a plasma, which apparatus includes a closed loop magnetic core linking said plasma, a multi-turn primary winding linking said core, and means for causing alternating current flow in said winding; the improvement wherein: the turns of said winding are spatially distributed about said core with a density proportional to the current flow in adjacent regions of said plasma.
Claim 8
Dependent Claim
67 words
In apparatus for producing an electric current flow in a plasma, which apparatus includes a closed loop magnetic core linking said plasma, a multi-turn primary winding linking said core, and means for causing alternating current flow in said winding; the improvement wherein: the turns of said winding are spatially distributed about said core with a density proportional to the current flow in adjacent regions of said plasma.
Claim 9
Dependent Claim
36 words
The apparatus of claim 5 wherein said core is a toroid and wherein the distribution of turns on a sector of said toroid is proportional to said current flow in an adjacent sector of said plasma.
References Cited (Backward Citations)
US4005330A
Cited
US4017764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |