WO2007085973A2 - Electrodeless low-pressure discharge lamp - Google Patents
Electrodeless low-pressure discharge lamp Download PDFInfo
- Publication number
- WO2007085973A2 WO2007085973A2 PCT/IB2007/050066 IB2007050066W WO2007085973A2 WO 2007085973 A2 WO2007085973 A2 WO 2007085973A2 IB 2007050066 W IB2007050066 W IB 2007050066W WO 2007085973 A2 WO2007085973 A2 WO 2007085973A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- discharge lamp
- pressure discharge
- electrodeless low
- vessel
- discharge
- Prior art date
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Classifications
-
- 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
- H01J65/048—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 using an excitation coil
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/34—Double-wall vessels or containers
Definitions
- Electrodeless low-pressure discharge lamps are known from British patent application GB 2 133 612. Such electrodeless lamps are favorable because their discharge vessel filled with mercury vapor and a rare gas has small dimensions as compared with commercially available low-pressure discharge lamps provided with electrodes. The light generated by the lamps can thus be more readily concentrated by means of a luminaire. Furthermore, these electrodeless discharge lamps enjoy a longer life than the conventional lamps with discharge electrodes, because a main factor limiting the life of the conventional lamps has been the consumption of the electrodes and the stains resulting therefrom.
- a further advantage of the electrodeless lamp is that there is no thermal loss at the discharge electrodes, and that it may be easier to apply greater electric power to the lamp from the time of turn-on, because the impedance of the discharge in the electrodeless lamps commonly varies little from the time it is turned on till it attains the stable state. Also, the stabilization time of the electrodeless lamps is shorter because the electric discharge thereof is concentrated near the inner surface of the envelope of the lamp.
- the known electrodeless low-pressure mercury vapor discharge lamps also have several major drawbacks. An important drawback of the known low-pressure discharge lamp is that the discharge vessel contains mercury, which is a substance harmful to the environment. In response to the social needs of reducing the cause of global environmental pollution as much as possible, it is desirable that a mercury- free discharge lamp is developed.
- a discharge lamp comprising: a discharge vessel filled with an ionizable substance adapted to sustain an electric discharge due to an electric field induced therein, wherein said ionizable substance comprises a molecular halide, induction means for inducing said electric field in said vessel, and thermal insulation means for thermally insulating the discharge vessel at least partially.
- a molecular halide the discharge vessel is filled with a relatively environment-friendly substance compared to the toxic mercury.
- a molecular halide is defined as a, preferably binary, compound of which one part is formed by one or multiple halogen atoms and another part is formed by one or more other elements or radicals being less electronegative than the halogen atom(s), to make a fluoride, chloride, bromide, iodide, or astatide compound.
- the ioniable substance comprises a metal halide, more preferably indium halide, such as indium bromide and indium chloride.
- the thermally insulating means is applied to preserve an optimum temperature within the discharge vessel to allow an optimum discharge during lamp operation. Replacing mercury by a molecular halide will namely require another thermal balance within the discharge vessel to realize an optimum discharge.
- the discharge vessel has a substantially toroidal (doughnut) shape.
- a central hole of the toroidal-shaped discharge vessel is preferably adapted for accommodating the means for the induction means at least partially.
- the induction means preferably comprises at least one induction coil for inducing an electric field, more particularly an electromagnetic field, within said discharge vessel for exciting the molecular halide. More preferably, the at least one induction coil is wound around a soft magnetic body, such as a ferrite.
- the soft magnetic body is preferably covered by a heat- resistant envelope to minimize losses of the magnetic body.
- the discharge vessel is substantially thermally insulated by the thermal insulating means to minimize the loss of thermal energy.
- the thermal insulating means comprises a light-transmissive first housing, more preferably a bulb, for accommodating the discharge vessel. In this manner natural convection around the discharge vessel, and hence loss of thermal energy, can be counteracted even further.
- the space between the first housing and the discharge vessel is evacuated, or at least kept in a state of underpressure. By substantially evacuating said space, the thermal insulation around the discharge vessel can further be improved, as a result of which the discharge vessel can be kept at the optimum discharge temperature relatively easily.
- the first housing comprises an inner wall and an outer wall at a distance from the inner wall.
- thermal losses can also be reduced significantly, thereby facilitating retaining the discharge vessel at a desired elevated temperature.
- the space between the inner wall and the outer wall is evacuated, or at least kept in a state of underpressure to further reduce loss of thermal energy towards the atmosphere surrounding the discharge lamp according to the invention.
- the thermal insulating means further comprises at least one light-transmissive second housing for accommodating the first housing.
- the second housing is, like the first housing, preferably also formed by a bulb or a dome. Both housings are preferably made of quartz glass. However, it is also conceivable that both housings, or at least the second housing is made of normal glass.
- the second housing comprises an inner wall and an outer wall to optimize thermal insulation of the discharge lamp according to the invention.
- the first and/or the second housing is provided with a heat-reflective coating to reflect at least part of the infrared (thermal) radiation emitted by the discharge vessel back towards the discharge vessel to improve the thermal efficiency of the discharge lamp according to the invention even further.
- a molecular halide as a ionizable substance commonly together with a rare gas, will lead to a band of electromagnetic radiation, in particular ultraviolet radiation in a wavelength of approximately between 310 and 390 nm.
- electromagnetic radiation in particular ultraviolet radiation in a wavelength of approximately between 310 and 390 nm.
- a phosphorous coating is commonly relatively heat-sensitive.
- the phosphorous coating is preferably applied onto a relatively cold part of the discharge lamp at distance from the discharge vessel.
- at least one housing is provided with a phosphorous coating to preserve the quality and the efficiency of the phosphorous coating.
- the discharge lamp comprises a support structure for supporting at least the discharge vessel and the induction means.
- the support structure comprises a thermal insulating base plate, at least part of which base plate is more preferably made of polytetrafluoroethylene (Teflon ® ).
- Figure 1 shows a perspective view of a cross-section of a first embodiment of an electrodeless low-pressure discharge lamp according to the invention
- Figure 2 shows a cross-section of a second embodiment of an electrodeless low-pressure discharge lamp according to the invention.
- FIG. 1 shows a perspective view of a cross-section of a first embodiment of an electrodeless low-pressure discharge lamp 1 according to the invention.
- the lamp 1 comprises a glass discharge vessel 2, which is sealed in a vacuum-tight manner and encloses a discharge space containing a relatively environment-friendly ionizable substance, in particular a molecular halide and a rare gas.
- the discharge vessel 2 is substantially doughnut shaped and has a central hole 3 in which a body 4 of soft magnetic material surrounded by an electrical coil 5 is arranged together with said coil 5 for inducing an electric field within said discharge vessel 2 thereby exciting the halide molecules, as a result of which electromagnetic radiation is emitted.
- the vessel 2 is contained within a light-transmissive first bulb 6.
- the first bulb 6 is double-walled, and comprises hence an inner wall 7 and an outer wall 8, wherein the space enclosed by the inner wall 7 and the outer wall 8 is substantially evacuated to eliminate transport of thermal energy due to convection within this space.
- a surface of the inner wall 7 directed to the discharge vessel 2 is covered with a heat-reflective layer 9 to reflect infrared radiation emitted by the discharge vessel 2 back to the discharge vessel 2 to improve the thermal efficiency of the discharge lamp 1.
- the discharge lamp 1 further comprises a light-transmissive second bulb 10.
- the discharge lamp 1 further comprises a base structure 12 to support the discharge vessel 2, the soft magnetic body 4, the coil 5, and both bulbs 6, 10.
- the base structure is preferably made of polytetrafluoroethylene.
- FIG 2 shows a cross-section of a second embodiment of an electrodeless low-pressure discharge lamp 13 according to the invention.
- the discharge lamp 13 comprises a discharge vessel 14 containing (relatively environment-friendly) indium chloride and a rare gas.
- An electric field can be applied to the discharge vessel 14 by inducing an electric field by means of a soft magnetic body 15 around which an induction coil 16 is wound.
- the lamp 13 comprises a thermally insulating dome 17, which partially surrounds said discharge vessel 14.
- the dome 17 is double-walled, and hence comprises an inner wall 18 and an outer wall 19.
- the space enclosed by the inner wall 18 and the outer wall 19 is substantially evacuated.
- the inner wall 18 is preferably coated with a heat reflective layer (not shown).
- the space enclosed by the inner wall 18 and the discharge vessel 14 is substantially evacuated.
- the thermal insulation of the discharge lamp 13 can be optimized and thermal losses can be minimized in order to improve the efficiency of the discharge lamp 1 at least from an energetic, and hence from a point of view of economy.
Abstract
Electrodeless low-pressure discharge lamps (1, 13) are known from the prior art. Such electrodeless lamps are favorable because their discharge vessel (2, 14) filled with mercury vapor and a rare gas has small dimensions compared with commercially available low-pressure discharge lamps provided with electrodes. The invention relates to an improved electrodeless low-pressure discharge lamp, comprising an ionizable substance, comprising molecular halide, in its discharge vessel, and which comprises induction means said electric field in said vessel (2, 14), and thermal insulation means for thermally insulating the discharge vessel 2, 14) at least partially.
Description
Electrodeless low-pressure discharge lamp
The invention relates to an electrodeless low-pressure discharge lamp. Electrodeless low-pressure discharge lamps are known from British patent application GB 2 133 612. Such electrodeless lamps are favorable because their discharge vessel filled with mercury vapor and a rare gas has small dimensions as compared with commercially available low-pressure discharge lamps provided with electrodes. The light generated by the lamps can thus be more readily concentrated by means of a luminaire. Furthermore, these electrodeless discharge lamps enjoy a longer life than the conventional lamps with discharge electrodes, because a main factor limiting the life of the conventional lamps has been the consumption of the electrodes and the stains resulting therefrom. A further advantage of the electrodeless lamp is that there is no thermal loss at the discharge electrodes, and that it may be easier to apply greater electric power to the lamp from the time of turn-on, because the impedance of the discharge in the electrodeless lamps commonly varies little from the time it is turned on till it attains the stable state. Also, the stabilization time of the electrodeless lamps is shorter because the electric discharge thereof is concentrated near the inner surface of the envelope of the lamp. Besides advantages, the known electrodeless low-pressure mercury vapor discharge lamps also have several major drawbacks. An important drawback of the known low-pressure discharge lamp is that the discharge vessel contains mercury, which is a substance harmful to the environment. In response to the social needs of reducing the cause of global environmental pollution as much as possible, it is desirable that a mercury- free discharge lamp is developed.
It is an object of the invention to provide a relatively environment-friendly electrodeless low-pressure discharge lamp.
This object can be achieved by providing a discharge lamp according to theopening paragraph, comprising: a discharge vessel filled with an ionizable substance adapted to sustain an electric discharge due to an electric field induced therein, wherein said ionizable substance comprises a molecular halide, induction means for inducing said electric field in said vessel, and thermal insulation means for thermally insulating the discharge vessel at least partially. By applying a molecular halide the discharge vessel is filled with a relatively environment-friendly substance compared to the toxic mercury. A molecular halide
is defined as a, preferably binary, compound of which one part is formed by one or multiple halogen atoms and another part is formed by one or more other elements or radicals being less electronegative than the halogen atom(s), to make a fluoride, chloride, bromide, iodide, or astatide compound. Preferably, the ioniable substance comprises a metal halide, more preferably indium halide, such as indium bromide and indium chloride. The thermally insulating means is applied to preserve an optimum temperature within the discharge vessel to allow an optimum discharge during lamp operation. Replacing mercury by a molecular halide will namely require another thermal balance within the discharge vessel to realize an optimum discharge. Conventional low-pressure mercury discharges are optimum at a lowest temperature in the discharge of approximately 40-90 0C, while a discharge of a molecular halide is commonly optimal at a temperature of approximately 180-300 0C. Each specific compound of the group of molecular halides commonly has its own optimum discharge temperature. Since the optimum discharge temperature is relatively high, the loss of heat towards the atmosphere surrounding the discharge lamp is minimized by application of the thermally insulating means.
In a preferred embodiment the discharge vessel has a substantially toroidal (doughnut) shape. A central hole of the toroidal-shaped discharge vessel is preferably adapted for accommodating the means for the induction means at least partially. The induction means preferably comprises at least one induction coil for inducing an electric field, more particularly an electromagnetic field, within said discharge vessel for exciting the molecular halide. More preferably, the at least one induction coil is wound around a soft magnetic body, such as a ferrite. The soft magnetic body is preferably covered by a heat- resistant envelope to minimize losses of the magnetic body.
Preferably, the discharge vessel is substantially thermally insulated by the thermal insulating means to minimize the loss of thermal energy. In a preferred embodiment of the discharge lamp, the thermal insulating means comprises a light-transmissive first housing, more preferably a bulb, for accommodating the discharge vessel. In this manner natural convection around the discharge vessel, and hence loss of thermal energy, can be counteracted even further. In a particular preferred embodiment the space between the first housing and the discharge vessel is evacuated, or at least kept in a state of underpressure. By substantially evacuating said space, the thermal insulation around the discharge vessel can further be improved, as a result of which the discharge vessel can be kept at the optimum discharge temperature relatively easily.
In another preferred embodiment the first housing comprises an inner wall and an outer wall at a distance from the inner wall. By applying a double-walled housing thermal losses can also be reduced significantly, thereby facilitating retaining the discharge vessel at a desired elevated temperature. In a particular preferred embodiment, the space between the inner wall and the outer wall is evacuated, or at least kept in a state of underpressure to further reduce loss of thermal energy towards the atmosphere surrounding the discharge lamp according to the invention.
To even further reduce the thermal losses it is advantageous that the thermal insulating means further comprises at least one light-transmissive second housing for accommodating the first housing. The second housing is, like the first housing, preferably also formed by a bulb or a dome. Both housings are preferably made of quartz glass. However, it is also conceivable that both housings, or at least the second housing is made of normal glass. In a particular preferred embodiment the second housing comprises an inner wall and an outer wall to optimize thermal insulation of the discharge lamp according to the invention. In a preferred embodiment the first and/or the second housing is provided with a heat-reflective coating to reflect at least part of the infrared (thermal) radiation emitted by the discharge vessel back towards the discharge vessel to improve the thermal efficiency of the discharge lamp according to the invention even further.
During lamp operation, application of a molecular halide as a ionizable substance, commonly together with a rare gas, will lead to a band of electromagnetic radiation, in particular ultraviolet radiation in a wavelength of approximately between 310 and 390 nm. For a person skilled in the art it is conceivable to advantageously apply this radiation for certain purposes. However, preferably radiation with a wavelength falling within said wavelength band is converted into visible light by means of a phosphorous coating, wherein the wavelength(s) of the converted radiation is dependent on the nature of the phosphorous coating. However, a phosphorous coating is commonly relatively heat- sensitive. For this reason, the phosphorous coating is preferably applied onto a relatively cold part of the discharge lamp at distance from the discharge vessel. To this end, at least one housing is provided with a phosphorous coating to preserve the quality and the efficiency of the phosphorous coating.
In a preferred embodiment the discharge lamp comprises a support structure for supporting at least the discharge vessel and the induction means. In case one or more housings are applied to improve thermal insulation of the discharge lamp these housings are preferably also supported by the (common) support structure. Preferably, the support
structure comprises a thermal insulating base plate, at least part of which base plate is more preferably made of polytetrafluoroethylene (Teflon®).
The invention can further be illustrated by way of the following non- limitative embodiments, wherein:
Figure 1 shows a perspective view of a cross-section of a first embodiment of an electrodeless low-pressure discharge lamp according to the invention, and
Figure 2 shows a cross-section of a second embodiment of an electrodeless low-pressure discharge lamp according to the invention.
Figure 1 shows a perspective view of a cross-section of a first embodiment of an electrodeless low-pressure discharge lamp 1 according to the invention. The lamp 1 comprises a glass discharge vessel 2, which is sealed in a vacuum-tight manner and encloses a discharge space containing a relatively environment-friendly ionizable substance, in particular a molecular halide and a rare gas. The discharge vessel 2 is substantially doughnut shaped and has a central hole 3 in which a body 4 of soft magnetic material surrounded by an electrical coil 5 is arranged together with said coil 5 for inducing an electric field within said discharge vessel 2 thereby exciting the halide molecules, as a result of which electromagnetic radiation is emitted. In order to secure preservation of a required elevated discharge temperature (of between 180 and 300 0C) within said vessel 2, the vessel 2 is contained within a light-transmissive first bulb 6. The first bulb 6 is double-walled, and comprises hence an inner wall 7 and an outer wall 8, wherein the space enclosed by the inner wall 7 and the outer wall 8 is substantially evacuated to eliminate transport of thermal energy due to convection within this space. A surface of the inner wall 7 directed to the discharge vessel 2 is covered with a heat-reflective layer 9 to reflect infrared radiation emitted by the discharge vessel 2 back to the discharge vessel 2 to improve the thermal efficiency of the discharge lamp 1. To further improve the thermal efficiency the discharge lamp 1 further comprises a light-transmissive second bulb 10. Compared to the discharge vessel 2 the (outer) second bulb 10 has a relatively low temperature during lamp operation. For this reason, a surface of the second bulb 10 directed to the first bulb 6 (and to the discharge vessel 2) is provided with a commonly heat-sensitive phosphorous coating 11 to selectively convert UV-light generated within the discharge vessel 2 into visible light. The discharge lamp 1 further comprises a base
structure 12 to support the discharge vessel 2, the soft magnetic body 4, the coil 5, and both bulbs 6, 10. The base structure is preferably made of polytetrafluoroethylene.
Figure 2 shows a cross-section of a second embodiment of an electrodeless low-pressure discharge lamp 13 according to the invention. The discharge lamp 13 comprises a discharge vessel 14 containing (relatively environment-friendly) indium chloride and a rare gas. An electric field can be applied to the discharge vessel 14 by inducing an electric field by means of a soft magnetic body 15 around which an induction coil 16 is wound. Since an optimum discharge within the discharge vessel 14 will occur at elevated temperature, the lamp 13 comprises a thermally insulating dome 17, which partially surrounds said discharge vessel 14. The dome 17 is double-walled, and hence comprises an inner wall 18 and an outer wall 19. The space enclosed by the inner wall 18 and the outer wall 19 is substantially evacuated. The inner wall 18 is preferably coated with a heat reflective layer (not shown). Moreover, the space enclosed by the inner wall 18 and the discharge vessel 14 is substantially evacuated. In this manner the thermal insulation of the discharge lamp 13 can be optimized and thermal losses can be minimized in order to improve the efficiency of the discharge lamp 1 at least from an energetic, and hence from a point of view of economy.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims
1. Electrodeless low-pressure discharge lamp (1, 13), comprising: a discharge vessel (2, 14) filled with an ionizable substance adapted to sustain an electric discharge due to an electric field induced therein, wherein said ionizable substance comprises a molecular halide, - induction means for inducing said electric field in said vessel (2, 14), and thermal insulation means for thermally insulating the discharge vessel (2, 14) at least partially.
2. Electrodeless low-pressure discharge lamp (1, 13) according to claim 1, characterized in that the discharge vessel (2, 14) is provided with a protuberance (3) for accommodating the induction means at least partially.
3. Electrodeless low-pressure discharge lamp (1, 13) according to claim 1 or 2, characterized in that the induction means comprises at least one induction coil (5, 16).
4. Electrodeless low-pressure discharge lamp (1, 13) according to claims 2 and 3, characterized in that the at least one coil (5, 16) is positioned within the protuberance (3) at least partially.
5. Electrodeless low-pressure discharge lamp (1, 13) according to claim 3 or 4, characterized in that the at least one induction coil (5, 16) is wound around a soft magnetic body (4, 15).
6. Electrodeless low-pressure discharge lamp (1, 13) according to any one of the preceding claims, characterized in that the thermal insulating means further comprises a light-transmissive first housing (6, 17) for accommodating the discharge vessel (2, 14).
7. Electrodeless low-pressure discharge lamp (1, 13) according to claim 6, characterized in that the space between the first housing (6, 17) and the discharge vessel (2, 14) is substantially evacuated.
8. Electrodeless low-pressure discharge lamp (1, 13) according to claim 6 or 7, characterized in that the first housing (6, 17) comprises an inner wall (7, 18) and an outer wall (8, 19) at a distance from the inner wall (7, 18).
9. Electrodeless low-pressure discharge lamp (1, 13) according to claim 8, characterized in that the space between the inner wall (7, 18) and the outer wall (8, 19) is substantially evacuated.
10. Electrodeless low-pressure discharge lamp (1, 13) according to any one of claims 6-9, characterized in that the thermal insulating means further comprises at least one light-transmissive second housing (10) for accommodating the first housing (6, 17).
11. Electrodeless low-pressure discharge lamp (1, 13) according to any one of claims 6-10, characterized in that at least one housing is provided with a phosphorous coating (11).
12. Electrodeless low-pressure discharge lamp (1, 13) according one of claims 6- 11, characterized in that the first and/or the second housing (6, 10, 17) is provided with a heat-reflective coating (9) at the side facing the discharge vessel (2, 14).
13. Electrodeless low-pressure discharge lamp (1, 13) according to any one of the preceding claims, characterized in that the discharge lamp (1, 13) comprises a support structure (12) for supporting at least the discharge vessel (2, 14) and the induction means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06100848 | 2006-01-25 | ||
| EP06100848.8 | 2006-01-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2007085973A2 true WO2007085973A2 (en) | 2007-08-02 |
| WO2007085973A3 WO2007085973A3 (en) | 2008-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2007/050066 WO2007085973A2 (en) | 2006-01-25 | 2007-01-10 | Electrodeless low-pressure discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2007085973A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009030310A1 (en) * | 2009-06-24 | 2010-12-30 | Osram Gesellschaft mit beschränkter Haftung | Dielectric barrier discharge lamp with discharge spaces |
| EP3479394A4 (en) * | 2016-06-30 | 2020-07-22 | Yehi Or Light Creation Limited | High efficiency light system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675577A (en) * | 1985-04-15 | 1987-06-23 | Intent Patents A.G. | Electrodeless fluorescent lighting system |
| EP0440300A1 (en) * | 1990-02-02 | 1991-08-07 | Koninklijke Philips Electronics N.V. | Electrodeless low-pressure discharge lamp |
| US5248918A (en) * | 1990-12-04 | 1993-09-28 | General Electric Company | Starting aid for an electrodeless high intensity discharge lamp |
-
2007
- 2007-01-10 WO PCT/IB2007/050066 patent/WO2007085973A2/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675577A (en) * | 1985-04-15 | 1987-06-23 | Intent Patents A.G. | Electrodeless fluorescent lighting system |
| EP0440300A1 (en) * | 1990-02-02 | 1991-08-07 | Koninklijke Philips Electronics N.V. | Electrodeless low-pressure discharge lamp |
| US5248918A (en) * | 1990-12-04 | 1993-09-28 | General Electric Company | Starting aid for an electrodeless high intensity discharge lamp |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009030310A1 (en) * | 2009-06-24 | 2010-12-30 | Osram Gesellschaft mit beschränkter Haftung | Dielectric barrier discharge lamp with discharge spaces |
| US8441189B2 (en) | 2009-06-24 | 2013-05-14 | Osram Gesellschaft Mit Beschrankter Haftung | Dielectric barrier discharge lamp with discharge spaces |
| EP3479394A4 (en) * | 2016-06-30 | 2020-07-22 | Yehi Or Light Creation Limited | High efficiency light system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007085973A3 (en) | 2008-06-12 |
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