Patent US4180763A successfully refreshed from Google Patents.
US4180763A
Expired / Lapsed
US
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High intensity discharge lamp geometries
Assignee: General Electric Co
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Filing: 1978-01-25
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Granted: 1979-12-25
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Expires: 1998-01-25
Abstract
Abstract Novel geometries for high intensity discharge solenoidal electric field lamps are disclosed providing good coupling between the magnetic fields within the ferrite and the plasma discharge. In addition, the geometries provide for good heat sinking and cooling capabilities as well as escape of most of the generated light. In accordance with one embodiment of the present invention, a plurality of toroidal shaped ferrite cores are arranged about the high intensity discharge tube, the tube being threaded through the holes in the toroidal ferrite cores. In accordance with another embodiment of the present invention, a bundle of ferrite rods is disposed through the hole of a toroidal shaped discharge tube, the packing density of the ferrite rods in the bundle being less than one hundred percent efficient whereby channels for cooling air are formed.
Inventors
- 👤 John M. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:44
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
125 words
A high intensity discharge, solenoidal electric field lamp comprising: an inner toroidal shaped discharge tube containing a suitable ionizable gaseous medium which emits visible wavelength radiation when a current traverses said ionizable medium, said medium being at a pressure of between approximately 200 torr and approximately one atmosphere; an outer toroidal shaped transparent protective tube wholly surrounding said discharge tube; means for centrally spacing said inner discharge tube within said outer protective tube, so that the surfaces of neither come in contact; a plurality of toroidal shaped ferrite cores disposed in a substantially regular manner circumferentially about the inner discharge tube and the outer protective tube in the form of interlocking rings; and means to couple the ferrite cores to a radio frequency power source.
Claim 2
Dependent Claim
125 words
A high intensity discharge, solenoidal electric field lamp comprising: an inner toroidal shaped discharge tube containing a suitable ionizable gaseous medium which emits visible wavelength radiation when a current traverses said ionizable medium, said medium being at a pressure of between approximately 200 torr and approximately one atmosphere; an outer toroidal shaped transparent protective tube wholly surrounding said discharge tube; means for centrally spacing said inner discharge tube within said outer protective tube, so that the surfaces of neither come in contact; a plurality of toroidal shaped ferrite cores disposed in a substantially regular manner circumferentially about the inner discharge tube and the outer protective tube in the form of interlocking rings; and means to couple the ferrite cores to a radio frequency power source.
Claim 3
Dependent Claim
13 words
The lamp of claim 1 in which the ionizable medium is mercury vapor.
Claim 4
Dependent Claim
33 words
The lamp of claim 1 in which there is a coating on the outer toroidal protective tube said coating being selected from the group consisting of calcium halo-apatate and europium doped yttrium vanadate.
Claim 5
Dependent Claim
25 words
The lamp of claim 1 in which the inner discharge tube is of a material selected from the group consisting of quartz and transparent ceramics.
Claim 6
Dependent Claim
13 words
The lamp of claim 1 in which the outer protective tube is Pyrex®.
Claim 7
Dependent Claim
30 words
The lamp of claim 1 in which the means for centrally spacing the inner discharge tube within the outer protective tube comprises a a plurality of circular, corrugated, refractory bands.
Claim 8
Dependent Claim
21 words
The lamp of claim 6 in which the refractory bands are selected from the group consisting of molybdenum, tungsten and quartz.
Claim 9
Dependent Claim
16 words
The lamp of claim 1 in which the toroidal shaped cores have rectangular vertical cross sections.
Claim 10
Dependent Claim
52 words
The lamp of claim 1 in which the means to drive ferrite cores comprises a plurality of windings of a single conductor, each such winding being threaded through each ferrite core, said windings having a radius no greater than necessary to circumscribe said ferrite cores, whereby a minimum winding length is provided.
Claim 11
Dependent Claim
25 words
The lamp of claim 1 in which the means to drive the ferrite cores operates at a frequency of between 50 kilohertz and 2 megahertz.
Claim 12
Dependent Claim
22 words
The lamp of claim 1 in which the means to drive the ferrite cores operates at a frequency of approximately 500 kilohertz.
Claim 13
Dependent Claim
23 words
The lamp of claim 1 in which there are separate means to drive each ferrite core, said means operating in a synchronized fashion.
Claim 14
Dependent Claim
15 words
The lamp of claim 1 in which the ferrite toroids are mounted to heat-sinking means.
Claim 15
Dependent Claim
25 words
The lamp of claim 1 additionally comprising: a cylindrical, vertically slotted, metallic, reflective shield disposed just within the toroidal hole of the outer protective tube.
Claim 16
Dependent Claim
16 words
The lamp of claim 1 in which the ferrite cores are coated with a reflective material.
Claim 17
Dependent Claim
17 words
The lamp of claim 1 additionally comprising: a buffer gas between said inner and outer toroidally-shaped tubes.
Claim 18
Dependent Claim
20 words
The lamp of claim 16 in which the buffer gas is selected from the group consisting of nitrogen and argon.
Claim 19
Dependent Claim
24 words
The lamp of claim 16 in which the buffer gas is at a pressure of between approximately 500 and 600 Torr at room temperature.
Claim 20
Dependent Claim
15 words
The lamp of claim 1 in which the ionizable medium further comprises metal halide additives.
Claim 21
Dependent Claim
19 words
The lamp of claim 1 in which the ionizable medium comprises mercury vapor with xenon and sodium as additives.
Claim 22
Dependent Claim
137 words
A high intensity discharge, solenoidal electric field lamp comprising: an inner toroidal shaped discharge tube containing a suitable ionizable gaseous medium which emits visible wavelength radiation when a current traverses said ionizable medium, said medium being at a pressure of between approximately 200 torr and approximately one atmosphere; an outer toroidal shaped transparent protective tube wholly surrounding said discharge tube; means for centrally spacing said inner discharge tube within said outer protective tube, so that the surface of neither come in contact; a bundle of ferrite rods disposed along the axis of said toroidal tubes, said tubes being substantially equi-distant from the ends of said bundle, said bundle of ferrite rods defining a plurality of channels traversing the length of said bundle along said rods; means to couple the ferrite rods to a radio frequency power source.
Claim 23
Dependent Claim
137 words
A high intensity discharge, solenoidal electric field lamp comprising: an inner toroidal shaped discharge tube containing a suitable ionizable gaseous medium which emits visible wavelength radiation when a current traverses said ionizable medium, said medium being at a pressure of between approximately 200 torr and approximately one atmosphere; an outer toroidal shaped transparent protective tube wholly surrounding said discharge tube; means for centrally spacing said inner discharge tube within said outer protective tube, so that the surface of neither come in contact; a bundle of ferrite rods disposed along the axis of said toroidal tubes, said tubes being substantially equi-distant from the ends of said bundle, said bundle of ferrite rods defining a plurality of channels traversing the length of said bundle along said rods; means to couple the ferrite rods to a radio frequency power source.
Claim 24
Dependent Claim
13 words
The lamp of claim 21 in which the ionizable medium is mercury vapor.
Claim 25
Dependent Claim
33 words
The lamp of claim 21 in which there is a coating on the outer toroidal protective tube said coating being selected from the group consisting of calcium halo-apatate and europium doped yttrium vanadate.
Claim 26
Dependent Claim
25 words
The lamp of claim 21 in which the inner discharge tube is of a material selected from the group consisting of quartz and transparent ceramics.
Claim 27
Dependent Claim
13 words
The lamp of claim 21 in which the outer protective tube is Pyrex®.
Claim 28
Dependent Claim
29 words
The lamp of claim 21 in which the means for centrally spacing the inner discharge tube within the outer discharge tube comprises a plurality of circular, corrugated refractory bands.
Claim 29
Dependent Claim
21 words
The lamp of claim 26 in which said refractory bands are selected from the group consisting of molybdenum, tungsten, and quartz.
Claim 30
Dependent Claim
41 words
The lamp of claim 21 in which the means to drive the ferrite rods comprises a plurality of insulated windings of a single conductor around the ferrite bundle, the ends of said conductor being attached to a radio frequency power source.
Claim 31
Dependent Claim
27 words
The lamp of claim 21 in which the means to drive the ferrite rods operates at a frequency of between approximately 1.6 megahertz and approximately 15 megahertz.
Claim 32
Dependent Claim
22 words
The lamp of claim 29 in which the means to drive the ferrite rods operates at a frequency of approximately 2 megahertz.
Claim 33
Dependent Claim
37 words
The lamp of claim 21 additionally comprising: a cylindrical, vertically slotted, metallic, reflective shield disposed just within the toroidal hole of the protective tube, said shield being flanged so as to act as a magnetic flux expander.
Claim 34
Dependent Claim
17 words
The lamp of claim 21 additionally comprising: a buffer gas between said inner and outer toroidally-shaped tubes.
Claim 35
Dependent Claim
20 words
The lamp of claim 32 in which the buffer gas is selected from the group consisting of nitrogen and argon.
Claim 36
Dependent Claim
24 words
The lamp of claim 32 in which the buffer gas is at a pressure of between approximately 500 and 600 Torr at room temperature.
Claim 37
Dependent Claim
17 words
The lamp of claim 21 in which the ferrite rods are contained within a cylindrical dielectric sleeve.
Claim 38
Dependent Claim
11 words
The lamp of claim 35 in which said sleeve is Pyrex®.
Claim 39
Dependent Claim
15 words
The lamp of claim 21 in which the ionizable medium further comprises metal halide additives.
Claim 40
Dependent Claim
18 words
The lamp of claim 21 in which the ionizable medium comprises mercury vapor with xenon and sodium additives.
Claim 41
Dependent Claim
20 words
The lamp of claim 21 further comprising: means for passing a cooling fluid through said channels in the ferrite bundle.
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GB1334911A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |