CA2214891A1 - Apparatus for exciting an electrodeless lamp with microwave radiation - Google Patents
Apparatus for exciting an electrodeless lamp with microwave radiation Download PDFInfo
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- CA2214891A1 CA2214891A1 CA002214891A CA2214891A CA2214891A1 CA 2214891 A1 CA2214891 A1 CA 2214891A1 CA 002214891 A CA002214891 A CA 002214891A CA 2214891 A CA2214891 A CA 2214891A CA 2214891 A1 CA2214891 A1 CA 2214891A1
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- lamp
- cavity
- cylindrical cavity
- electrodeless lamp
- electric field
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
- H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
- H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
- H01J65/044—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by a separate microwave unit
Abstract
Apparatus for exciting an electrodeless lamp to produce visible light. A
source of microwave energy (22) is coupled to a cylindrical cavity (10) which encloses an electrodeless lamp (11). The cylindrical cavity (10) includes a sidewall and end wall (10a) which is made from a metallic mesh which passes light produced from the electrodeless lamp (11). The electric field intensity within the cylindrical cavity (10) is increased in the region (11a) above the lamp center (11b). The increased electric field intensity produces more uniform temperature across the bulb surface, thereby increasing the rate of plasma heating of gas molecules within the lamp (11).
source of microwave energy (22) is coupled to a cylindrical cavity (10) which encloses an electrodeless lamp (11). The cylindrical cavity (10) includes a sidewall and end wall (10a) which is made from a metallic mesh which passes light produced from the electrodeless lamp (11). The electric field intensity within the cylindrical cavity (10) is increased in the region (11a) above the lamp center (11b). The increased electric field intensity produces more uniform temperature across the bulb surface, thereby increasing the rate of plasma heating of gas molecules within the lamp (11).
Description
PCT~US96/03262 APPARATUS FOR EXCIIING AN
ELECIRODFLESS I~ WII~I MICROWA~7E RADLATION
The present inventio~ relates to the field of a~alatus for e~ting electrodeless l~mps. Specifically, an ~palatus for ul~iro~ ly r~ ng an S electrodeless lamp with ilnpl~ ved illumination efficiency is described.
Electrodeless lamps have been employed in the past to generate high intensity radiant light in excess of 100,000 lumens. These devices are used in industrial lightin~ in both indoor and outdoor applications. Among the advantages of electrodeless lamps is an enhanced life of between 10,000 and 20,000 hours. Further, greater power efEiciency is obtained than with other collvenlional light sources.
Electrodeless lamps may be designed to emit mostly infrared light, ultraviolet light or visible light. In applications wherein visible light is needed, electrodeless lamps are sulfur or selenium filled to produce mostly visible light. Other lamps of other materials, such as mercury, can be used to generate ultraviolet and infrared light in industrial applications where these wavelengths of light are needed.
Sulfur and selenium filled lamps have a light output which can be affected by local temperatures within the lamp. These gas-filled lamps show dark bands, particularly along the top thereof, when the lamp surface is not uniformly heated. Cooler portions of the lamp can produce discoloration which absorbs light disproportionately from the rem~ining portion of the lamp surface.
W O 96/28840 PCTrUS96/03262 Temperature diLL~lentials within the bulb are very often the result of an uneven field distribution of the micl uwave energy which is supported in a resonant cavity Cont~inin~ the lamp. The uneven field distribution produces an uneven rlie~ rge which in turn produces "sludge", a dark gas S conPinin~ higher order sulfur molecules which degrade the lamp's pel~l~ance. Therefore, in order to avoid the consequences of local temperature di~erelllials within the lamp, the miel-~w~ve illumination of the bulb should be uniform across the surface of the lamp.
Other ~ h.;~ et~nces which impact on the efficiency of illnmin~on of the electrodeless lamp include interaction of the fringe field produced between the micr.,w~ve energy source and the cavity with the electrodeless lamp.
The lamp can distort the coupling fields between cavity and mi~ luwave energy source, introducing an impedance mi~m~tch and consequent power loss, lvweli-~g the system's efflciency.
Sllmm~y of the Invention It is an object of this invention to efficiently illuminate an electrodeless lamp with micl~,w~ve energy.
It is a more specific object of this invention to provide for a microwave illllmin~tion field which heats an electrodeless lamp uniformly over its entire surface.
It is yet another object of this invention to increase the amount of visible light generated by a micl.~wave illuminated electrodeless lamp.
These and other objects of the invention are provided for by a microwave CA 022l489l l997-09-08 W O 96/28840 PCTrUS96103262 min~tion :jy~em which i~ roves the electrom~gnetic field distribution about an electrodeless lamp so that portions of the lamp which run cooler are exposed to an ascending or increasing electric field intensity. The electrodeless lamp is supported for rotation in a cylindrical cavity about the S cavity axis. The cylindrical cavi~y has an apertured surface which emits light generated by the electrodeless lamp when excited by micr.,w~/e energy.
Control over the electromagnetic field distribution is accomplished in a preferred embodiment of the il~e~Lion by configuring the cylindrical cavity to support the T E112 resonant mode. In this mode, an ascending portion of the electric field can be positioned adjacent the portion of an electrodeless lamp which would normally remain cooler, increasing the electric field intensity, thus raising the temperature of the normally cooler portion of the lamp.
In other embodiments of the invention, a local discontinuity is introduced in the ~ylindrical cavity wall, increasing the electric field intensity on the portion of the electrodeless lamp which normally runs cooler than the rem~ining portion of the lamp.
Description of the Figures Figure 1 is a plan view of an apparatus for generating light from an electrodeless bulb.
Figure 2 is an end view of the apparatus of Figure 1.
Figure 3 is a top view of the apparatus of Figure 1.
W O 96/28840 PCTrUS96/03262 Figure 4A illustrates the electric field distribution within a cylindrical ca-vity when excited with a TElll mode.
Figure 4B illustrates the ~ruved field distribution from a TE112 mode.
Figure SA is a section -view of a cylindrical ca-vity having a restriction alongS its length for increasing the electric field near the top of an electrodeless lamp.
Figure SB is a top view of Figure SA.
Figure 6A illustrates an iris supported in the cylindrical cavity for increasingthe electric field near the top of the electrodeless lamp.
Figure 6B is a top view of Figure 6A.
Figure 7A illustrates a torroidal ring within the cylindrical cavity for increasing the electric field near the top of the electrodeless lamp.
Figure 7B is a section view of Figure 7A.
Description of the Preferred Embodiment lS Referring to Figures 1, 2 and 3, there is shown respectively, plan, end and top views of an apparatus for generating light from an electrodeless lamp 11. The electrodeless lamp 11, in the preferred embodiment of the invention, contains either sulfur or selenium, which, when excited with rnic~uw~ve energy, generates primarily visible light. The apparatus ûf Figure 1 includes a housing 20 which is open along the top, and which WO 96t28840 PCT/US96103~6 encloses a filament ha~ru~l.,er 26 for providing filament current to a magnetron 22, a motor 14 for rotating an electrodeless lamp 11, and a cooling fan 25 for providing cooling air to the magnetron 22.
The magnetron 22 is a commercially available m~gnetron operating at S a~r~x;.~tely 2.45 G~. The magnetron ~ has an ante.~lla 22a coupled to a waveguide section 23 which enters the housing 20 and closes the top of housing 20. Waveguide section 23 couples the micrc,w~ve energy from magnetron ~ to a longitl~-lin~l slot 24 on the top wall of the waveguide.
Microwave energy coupled through slot 24 propagates along the longit~ in~l axis of cylindrical cavity 10 towards end lOa.
T,he electrodeless lamp 11 is supported on a shaft 12 which is coupled via coupling 13 to the motor 14. As is known in the electrodeless lamp art, rotation of the lamp 11 at several hundred RPM creates a u~iro~m plasma 11, and provides cil~;u~lferential temperatllre uniformity to the lamp 11, thus prolonging its life.
The electrodeless lamp 11 is shown inside cylindrical cavity 10 which may include an apertured surface to emit light from the lamp 11 while confining the electromagnetic radiation within the cylindrical cavity. The cylindrical cavity 10 has sidewalls and an end wall lOa which may be made from a metallic mesh or screen which emits light.
The apertured portion 10 of the cavity is clamped via a clamp 19 to cylindrcal fiange 15 bolted to the surface of the waveguide 23, forming the top of housing 20. A transparent protection dome 16 is placed over the cavity 10.
W 096/28840 PCTrUS96/03262 The lamp 11 includes a top portion lla above the lamp center llb, which is subject to a local temperature dirreLelltial with respect to the rem~ining portion of the lamp 11. When a TElll mode is supported within the cavity 10, the electric field in the region of lamp portion lla is decreasing in inten~ity, and ic--~w~ve illllmin~hon of the lamp, particularly in the region lla, is non-uniform, resulting in uneven heating of the lamp 11.
The sulfur or selenium molecules within the lamp 11 are unevenly heated and may produce a dark, light impermeable region in a portion 1 la of lamp 11 above the center of the lamp llb. This reduces the amount of light which is generated through portion lla, decreasing total light output and m~king light output non-uniform over the surface of lamp 11.
Figure 4A illustrates the field distribution within the cylindrical cavity 10 which identifies the source of unequal heating of the lamp 11. The solid line represents the sinusoidal electric field distribution of a TElll propagation mode supported within cylindrical cavity 10 in the absence of a lamp. The portion of the TElll electric field distribution adjacent region lla, is descending in electric field strength. Less energy is thus absorbed by the electrodeless lamp in region lla, resulting in a lower temperature than in the region opposite the ascending portion of the electric field distribution.
In the presence of the lamp, the broken line illustrates how the electric field strength rapidly reduces in the region lla, resulting in a lower temperature, pro~ n~ a light-absorbing gas in sulfur- and selenium-filled lamps. Light production in region lla suffers due to the light absorbing gas.
WO 96/28B40 PCTIIJS961~13262 In accordance with a preferred embodiment of the i..venlion, the cavity 10 is a cylindrical cavity supporting a T E112 propagation mode. The cylindrical cavity 10 may be configured in length and dimensions in accordance with a co~v~ntional mode chart for right circular cylindrical cavities as descrl~ed in the text 'Intro~ on to Mic~w~ve Theory and Measurements" to support a T E112 propagation mode. The TE112 mode, as shown in Figure 4B, provides for an electric field distribution along the axis of the cylindrical cavity which has two sinusoidal peaks associated with it. The second sinusoidal peak is located such that an ascending increasing intensity of the electric field is adjacent the region lla of the electrodeless lamp 11, increasing the electric field strength in the region lla. The increased electric field intensity in this region increases the temperature of region lla, reducing the amount of light absorbing gas which forms at the top of the electrodeless lamp lla.
The length of the cylindrical cavity 10 is selected so that the lamp 11 may be supported far enough away from the slot 24 to avoid coupling of the fringe field associated with slot 24 with the lamp 11.
The increased electric field at the top of the lamp provides a more uniform discharge and prevents the formation of sludge or higher order molecules which degrade the lamp's light generation efficiency. The rate of energy absorption, particularly in a sulfurplasmawithin the lamp, is increased near the top of the lamp, increasing plasma heating of the gas molecules.
In the TElll mode, positioning the bulb further down the cavity where the electric field intensity is rising would result in better heating of the top of the lamp. However, this would reduce the optical access to the lamp, and W 096/28840 PCTrUS96/03262 would promote near field interaction with the fringe fields produced at the boundary between the cylindrical cavity 10 and the slot 24 of the waveguide 24.
Other techniques for locally increasing the electric field intensity near the S top of the lamp 11 are shown in Figures SA, 5B, 6A, 6B, 7A and 7B.
These techniques do not require the T E112 resonant mode.
Figures SA and SB show a nall~)willg of the cavity 10 in the region lla of the lamp to create a restriction 30 for increasing the electric field intensity in region lla.
Figures 6A and 6B illustrate an iris 31 which is located within the cylindrical cavity 10 at a location opposite region lla for increasing the electric field intensity in the region above the lamp center llb.
Figures 7A and 7B illustrate the use of a suspended torroidal metallic ring 32 which increases the field intensity in the region lla of the lamp 11.
Each of the foregoing embodiments achieves the objective of m~int~ininE
the lamp 11 sufficiently ~ict~nt from the slot 24 to avoid coupling with the fringe field produced from the coupling slot 24. Further, the height of the lamp 11 from the housing 20 permits full optical access to the lamp.
Thus, there has been described with respect to several embodiments, a technique for efflciently illllmin~ting an electrodeless bulb which avoids local temperature differentials in the bulb, thus increasing light output.
Those skilled in the art will recognize yet other embodiments of the W 096/28840 PCTrUS96/03262 invention as described more fully by the daims which follow.
ELECIRODFLESS I~ WII~I MICROWA~7E RADLATION
The present inventio~ relates to the field of a~alatus for e~ting electrodeless l~mps. Specifically, an ~palatus for ul~iro~ ly r~ ng an S electrodeless lamp with ilnpl~ ved illumination efficiency is described.
Electrodeless lamps have been employed in the past to generate high intensity radiant light in excess of 100,000 lumens. These devices are used in industrial lightin~ in both indoor and outdoor applications. Among the advantages of electrodeless lamps is an enhanced life of between 10,000 and 20,000 hours. Further, greater power efEiciency is obtained than with other collvenlional light sources.
Electrodeless lamps may be designed to emit mostly infrared light, ultraviolet light or visible light. In applications wherein visible light is needed, electrodeless lamps are sulfur or selenium filled to produce mostly visible light. Other lamps of other materials, such as mercury, can be used to generate ultraviolet and infrared light in industrial applications where these wavelengths of light are needed.
Sulfur and selenium filled lamps have a light output which can be affected by local temperatures within the lamp. These gas-filled lamps show dark bands, particularly along the top thereof, when the lamp surface is not uniformly heated. Cooler portions of the lamp can produce discoloration which absorbs light disproportionately from the rem~ining portion of the lamp surface.
W O 96/28840 PCTrUS96/03262 Temperature diLL~lentials within the bulb are very often the result of an uneven field distribution of the micl uwave energy which is supported in a resonant cavity Cont~inin~ the lamp. The uneven field distribution produces an uneven rlie~ rge which in turn produces "sludge", a dark gas S conPinin~ higher order sulfur molecules which degrade the lamp's pel~l~ance. Therefore, in order to avoid the consequences of local temperature di~erelllials within the lamp, the miel-~w~ve illumination of the bulb should be uniform across the surface of the lamp.
Other ~ h.;~ et~nces which impact on the efficiency of illnmin~on of the electrodeless lamp include interaction of the fringe field produced between the micr.,w~ve energy source and the cavity with the electrodeless lamp.
The lamp can distort the coupling fields between cavity and mi~ luwave energy source, introducing an impedance mi~m~tch and consequent power loss, lvweli-~g the system's efflciency.
Sllmm~y of the Invention It is an object of this invention to efficiently illuminate an electrodeless lamp with micl~,w~ve energy.
It is a more specific object of this invention to provide for a microwave illllmin~tion field which heats an electrodeless lamp uniformly over its entire surface.
It is yet another object of this invention to increase the amount of visible light generated by a micl.~wave illuminated electrodeless lamp.
These and other objects of the invention are provided for by a microwave CA 022l489l l997-09-08 W O 96/28840 PCTrUS96103262 min~tion :jy~em which i~ roves the electrom~gnetic field distribution about an electrodeless lamp so that portions of the lamp which run cooler are exposed to an ascending or increasing electric field intensity. The electrodeless lamp is supported for rotation in a cylindrical cavity about the S cavity axis. The cylindrical cavi~y has an apertured surface which emits light generated by the electrodeless lamp when excited by micr.,w~/e energy.
Control over the electromagnetic field distribution is accomplished in a preferred embodiment of the il~e~Lion by configuring the cylindrical cavity to support the T E112 resonant mode. In this mode, an ascending portion of the electric field can be positioned adjacent the portion of an electrodeless lamp which would normally remain cooler, increasing the electric field intensity, thus raising the temperature of the normally cooler portion of the lamp.
In other embodiments of the invention, a local discontinuity is introduced in the ~ylindrical cavity wall, increasing the electric field intensity on the portion of the electrodeless lamp which normally runs cooler than the rem~ining portion of the lamp.
Description of the Figures Figure 1 is a plan view of an apparatus for generating light from an electrodeless bulb.
Figure 2 is an end view of the apparatus of Figure 1.
Figure 3 is a top view of the apparatus of Figure 1.
W O 96/28840 PCTrUS96/03262 Figure 4A illustrates the electric field distribution within a cylindrical ca-vity when excited with a TElll mode.
Figure 4B illustrates the ~ruved field distribution from a TE112 mode.
Figure SA is a section -view of a cylindrical ca-vity having a restriction alongS its length for increasing the electric field near the top of an electrodeless lamp.
Figure SB is a top view of Figure SA.
Figure 6A illustrates an iris supported in the cylindrical cavity for increasingthe electric field near the top of the electrodeless lamp.
Figure 6B is a top view of Figure 6A.
Figure 7A illustrates a torroidal ring within the cylindrical cavity for increasing the electric field near the top of the electrodeless lamp.
Figure 7B is a section view of Figure 7A.
Description of the Preferred Embodiment lS Referring to Figures 1, 2 and 3, there is shown respectively, plan, end and top views of an apparatus for generating light from an electrodeless lamp 11. The electrodeless lamp 11, in the preferred embodiment of the invention, contains either sulfur or selenium, which, when excited with rnic~uw~ve energy, generates primarily visible light. The apparatus ûf Figure 1 includes a housing 20 which is open along the top, and which WO 96t28840 PCT/US96103~6 encloses a filament ha~ru~l.,er 26 for providing filament current to a magnetron 22, a motor 14 for rotating an electrodeless lamp 11, and a cooling fan 25 for providing cooling air to the magnetron 22.
The magnetron 22 is a commercially available m~gnetron operating at S a~r~x;.~tely 2.45 G~. The magnetron ~ has an ante.~lla 22a coupled to a waveguide section 23 which enters the housing 20 and closes the top of housing 20. Waveguide section 23 couples the micrc,w~ve energy from magnetron ~ to a longitl~-lin~l slot 24 on the top wall of the waveguide.
Microwave energy coupled through slot 24 propagates along the longit~ in~l axis of cylindrical cavity 10 towards end lOa.
T,he electrodeless lamp 11 is supported on a shaft 12 which is coupled via coupling 13 to the motor 14. As is known in the electrodeless lamp art, rotation of the lamp 11 at several hundred RPM creates a u~iro~m plasma 11, and provides cil~;u~lferential temperatllre uniformity to the lamp 11, thus prolonging its life.
The electrodeless lamp 11 is shown inside cylindrical cavity 10 which may include an apertured surface to emit light from the lamp 11 while confining the electromagnetic radiation within the cylindrical cavity. The cylindrical cavity 10 has sidewalls and an end wall lOa which may be made from a metallic mesh or screen which emits light.
The apertured portion 10 of the cavity is clamped via a clamp 19 to cylindrcal fiange 15 bolted to the surface of the waveguide 23, forming the top of housing 20. A transparent protection dome 16 is placed over the cavity 10.
W 096/28840 PCTrUS96/03262 The lamp 11 includes a top portion lla above the lamp center llb, which is subject to a local temperature dirreLelltial with respect to the rem~ining portion of the lamp 11. When a TElll mode is supported within the cavity 10, the electric field in the region of lamp portion lla is decreasing in inten~ity, and ic--~w~ve illllmin~hon of the lamp, particularly in the region lla, is non-uniform, resulting in uneven heating of the lamp 11.
The sulfur or selenium molecules within the lamp 11 are unevenly heated and may produce a dark, light impermeable region in a portion 1 la of lamp 11 above the center of the lamp llb. This reduces the amount of light which is generated through portion lla, decreasing total light output and m~king light output non-uniform over the surface of lamp 11.
Figure 4A illustrates the field distribution within the cylindrical cavity 10 which identifies the source of unequal heating of the lamp 11. The solid line represents the sinusoidal electric field distribution of a TElll propagation mode supported within cylindrical cavity 10 in the absence of a lamp. The portion of the TElll electric field distribution adjacent region lla, is descending in electric field strength. Less energy is thus absorbed by the electrodeless lamp in region lla, resulting in a lower temperature than in the region opposite the ascending portion of the electric field distribution.
In the presence of the lamp, the broken line illustrates how the electric field strength rapidly reduces in the region lla, resulting in a lower temperature, pro~ n~ a light-absorbing gas in sulfur- and selenium-filled lamps. Light production in region lla suffers due to the light absorbing gas.
WO 96/28B40 PCTIIJS961~13262 In accordance with a preferred embodiment of the i..venlion, the cavity 10 is a cylindrical cavity supporting a T E112 propagation mode. The cylindrical cavity 10 may be configured in length and dimensions in accordance with a co~v~ntional mode chart for right circular cylindrical cavities as descrl~ed in the text 'Intro~ on to Mic~w~ve Theory and Measurements" to support a T E112 propagation mode. The TE112 mode, as shown in Figure 4B, provides for an electric field distribution along the axis of the cylindrical cavity which has two sinusoidal peaks associated with it. The second sinusoidal peak is located such that an ascending increasing intensity of the electric field is adjacent the region lla of the electrodeless lamp 11, increasing the electric field strength in the region lla. The increased electric field intensity in this region increases the temperature of region lla, reducing the amount of light absorbing gas which forms at the top of the electrodeless lamp lla.
The length of the cylindrical cavity 10 is selected so that the lamp 11 may be supported far enough away from the slot 24 to avoid coupling of the fringe field associated with slot 24 with the lamp 11.
The increased electric field at the top of the lamp provides a more uniform discharge and prevents the formation of sludge or higher order molecules which degrade the lamp's light generation efficiency. The rate of energy absorption, particularly in a sulfurplasmawithin the lamp, is increased near the top of the lamp, increasing plasma heating of the gas molecules.
In the TElll mode, positioning the bulb further down the cavity where the electric field intensity is rising would result in better heating of the top of the lamp. However, this would reduce the optical access to the lamp, and W 096/28840 PCTrUS96/03262 would promote near field interaction with the fringe fields produced at the boundary between the cylindrical cavity 10 and the slot 24 of the waveguide 24.
Other techniques for locally increasing the electric field intensity near the S top of the lamp 11 are shown in Figures SA, 5B, 6A, 6B, 7A and 7B.
These techniques do not require the T E112 resonant mode.
Figures SA and SB show a nall~)willg of the cavity 10 in the region lla of the lamp to create a restriction 30 for increasing the electric field intensity in region lla.
Figures 6A and 6B illustrate an iris 31 which is located within the cylindrical cavity 10 at a location opposite region lla for increasing the electric field intensity in the region above the lamp center llb.
Figures 7A and 7B illustrate the use of a suspended torroidal metallic ring 32 which increases the field intensity in the region lla of the lamp 11.
Each of the foregoing embodiments achieves the objective of m~int~ininE
the lamp 11 sufficiently ~ict~nt from the slot 24 to avoid coupling with the fringe field produced from the coupling slot 24. Further, the height of the lamp 11 from the housing 20 permits full optical access to the lamp.
Thus, there has been described with respect to several embodiments, a technique for efflciently illllmin~ting an electrodeless bulb which avoids local temperature differentials in the bulb, thus increasing light output.
Those skilled in the art will recognize yet other embodiments of the W 096/28840 PCTrUS96/03262 invention as described more fully by the daims which follow.
Claims (10)
1. An apparatus for exciting an electrodeless lamp with microwave energy comprising:
a source of microwave energy;
a cylindrical cavity coupled to said source of microwave energy, having a plurality of light emitting apertures, said cylindrical cavity supporting microwave energy said microwave energy coupled from said source having an electric field which varies sinusoidally along an axis of said cylindrical cavity; and an electrodeless lamp supported for rotation on a motor driven shaft in said cylindrical cavity along the axis of said cavity at a location which is distant from a location which produces fringe fields from coupling said microwave source to said cylindrical cavity, and located so that a portion of said electrodeless lamp above a center of said electrodeless lamp is illuminated by a portion of said electric field which is increasing in intensity along a length of said cavity, whereby said electrodeless lamp has a surface area which is heated at a substantially constant temperature across the surface area thereof.
a source of microwave energy;
a cylindrical cavity coupled to said source of microwave energy, having a plurality of light emitting apertures, said cylindrical cavity supporting microwave energy said microwave energy coupled from said source having an electric field which varies sinusoidally along an axis of said cylindrical cavity; and an electrodeless lamp supported for rotation on a motor driven shaft in said cylindrical cavity along the axis of said cavity at a location which is distant from a location which produces fringe fields from coupling said microwave source to said cylindrical cavity, and located so that a portion of said electrodeless lamp above a center of said electrodeless lamp is illuminated by a portion of said electric field which is increasing in intensity along a length of said cavity, whereby said electrodeless lamp has a surface area which is heated at a substantially constant temperature across the surface area thereof.
2. The apparatus for exciting an electrodeless lamp according to claim 1, wherein said cylindrical cavity has a length and diameter selected to support a TE112 mode of operation.
3. The apparatus for exciting an electrodeless lamp according to claim 1, wherein said cylindrical cavity includes an iris along said length for creating said increasing electric field intensity.
4. The apparatus for exciting an electrodeless lamp according to claim 1, wherein said cylindrical cavity includes a toroidal ring along the length of said cylindrical cavity for increasing said electric field intensity.
5. An apparatus for producing high intensity visible light comprising:
a housing supporting at one end thereof a magnetron and at an opposite end thereof a cooling fan which supplies forced air to said magnetron, and further including a motor with a driven shaft extending through said housing;
an electrodeless lamp supported on said driven shaft; and, a light emitting cylindrical cavity supported on said housing, said cylindrical cavity enclosing said electrodeless lamp, and coupled through said housing to said magnetron, whereby microwave energy generated by said magnetron is coupled to said cavity, said cavity supporting said microwave energy having an electric field which increases in intensity along a longitudinal axis of said cylindrical cavity in a region above a center of said lamp and adjacent an end of said electrodeless lamp, thereby decreasing local temperature variations in said lamp.
a housing supporting at one end thereof a magnetron and at an opposite end thereof a cooling fan which supplies forced air to said magnetron, and further including a motor with a driven shaft extending through said housing;
an electrodeless lamp supported on said driven shaft; and, a light emitting cylindrical cavity supported on said housing, said cylindrical cavity enclosing said electrodeless lamp, and coupled through said housing to said magnetron, whereby microwave energy generated by said magnetron is coupled to said cavity, said cavity supporting said microwave energy having an electric field which increases in intensity along a longitudinal axis of said cylindrical cavity in a region above a center of said lamp and adjacent an end of said electrodeless lamp, thereby decreasing local temperature variations in said lamp.
6. The apparatus of claim 5, wherein said cavity supports microwave energy having an TE112 mode.
7. The apparatus of claim 5, wherein said cavity includes means located above the center of said electrodeless lamp for increasing the electric field intensity in the region above said lamp center.
8. The apparatus of claim 7, wherein said means located above said center of said lamp comprises a restriction for narrowing a width of said cavity.
9. The apparatus of claim 7, wherein said means located above said lamp center includes an iris in said cavity.
10. The apparatus of claim 7, wherein said means located above said lamp center includes a toroidal ring connected to said cavity.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/402,065 US5594303A (en) | 1995-03-09 | 1995-03-09 | Apparatus for exciting an electrodeless lamp with an increasing electric field intensity |
| US08/402,065 | 1995-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2214891A1 true CA2214891A1 (en) | 1996-09-19 |
Family
ID=23590367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002214891A Pending CA2214891A1 (en) | 1995-03-09 | 1996-03-11 | Apparatus for exciting an electrodeless lamp with microwave radiation |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5594303A (en) |
| EP (1) | EP0819317B1 (en) |
| JP (1) | JPH11503263A (en) |
| AT (1) | ATE208960T1 (en) |
| CA (1) | CA2214891A1 (en) |
| DE (1) | DE69616996T2 (en) |
| HU (1) | HU221402B1 (en) |
| WO (1) | WO1996028840A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5808424A (en) * | 1995-12-07 | 1998-09-15 | Osgood; George M. | Illuminated power line marker |
| TW406280B (en) | 1997-05-21 | 2000-09-21 | Fusion Lighting Inc | non-rotating electrodeless lamp containing molecular fill |
| PT1137445E (en) * | 1998-11-28 | 2003-08-29 | Quay Technologies Ltd | ULTRAVIOLET SOURCE OF UV LIGHT ACROSS THE MICROWAVE |
| US7794673B2 (en) | 1999-11-23 | 2010-09-14 | Severn Trent Water Purification, Inc. | Sterilizer |
| US6737809B2 (en) * | 2000-07-31 | 2004-05-18 | Luxim Corporation | Plasma lamp with dielectric waveguide |
| US6922021B2 (en) * | 2000-07-31 | 2005-07-26 | Luxim Corporation | Microwave energized plasma lamp with solid dielectric waveguide |
| US7429818B2 (en) * | 2000-07-31 | 2008-09-30 | Luxim Corporation | Plasma lamp with bulb and lamp chamber |
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-
1995
- 1995-03-09 US US08/402,065 patent/US5594303A/en not_active Expired - Lifetime
-
1996
- 1996-03-11 AT AT96908743T patent/ATE208960T1/en not_active IP Right Cessation
- 1996-03-11 CA CA002214891A patent/CA2214891A1/en active Pending
- 1996-03-11 DE DE69616996T patent/DE69616996T2/en not_active Expired - Fee Related
- 1996-03-11 JP JP8527760A patent/JPH11503263A/en not_active Ceased
- 1996-03-11 HU HU9800281A patent/HU221402B1/en not_active IP Right Cessation
- 1996-03-11 WO PCT/US1996/003262 patent/WO1996028840A1/en active IP Right Grant
- 1996-03-11 EP EP96908743A patent/EP0819317B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0819317A1 (en) | 1998-01-21 |
| HU221402B1 (en) | 2002-09-28 |
| HUP9800281A3 (en) | 2000-05-29 |
| WO1996028840A1 (en) | 1996-09-19 |
| ATE208960T1 (en) | 2001-11-15 |
| DE69616996T2 (en) | 2002-06-27 |
| JPH11503263A (en) | 1999-03-23 |
| HUP9800281A2 (en) | 1998-06-29 |
| DE69616996D1 (en) | 2001-12-20 |
| MX9706829A (en) | 1998-06-30 |
| EP0819317A4 (en) | 1998-06-17 |
| US5594303A (en) | 1997-01-14 |
| EP0819317B1 (en) | 2001-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDC | Discontinued application reinstated |