WO2011048359A1 - Light source - Google Patents
Light source Download PDFInfo
- Publication number
- WO2011048359A1 WO2011048359A1 PCT/GB2010/001922 GB2010001922W WO2011048359A1 WO 2011048359 A1 WO2011048359 A1 WO 2011048359A1 GB 2010001922 W GB2010001922 W GB 2010001922W WO 2011048359 A1 WO2011048359 A1 WO 2011048359A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- enclosure
- light source
- void
- bulb
- plasma
- Prior art date
Links
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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention relates to a light source for a microwave-powered lamp. It is known to excite a discharge in a capsule with a view to producing light.
- Typical examples are sodium discharge lamps and fluorescent tube lamps.
- the latter use mercury vapour, which produces ultraviolet radiation. In turn, this excites fluorescent powder to produce light.
- Such lamps are more efficient in terms of lumens of light emitted per watt of electricity consumed than tungsten filament lamps. However, they still suffer the disadvantage of requiring electrodes within the capsule. Since these carry the current required for the discharge, they degrade and ultimately fail.
- PCT/GB2005/005080 for a bulb for the lamp and PCT/GB2007/00 935 for a matching circuit for a microwave-powered lamp relate to lamps operating electrodelessly by use of microwave energy to stimulate light emitting plasma in the bulbs.
- Earlier proposals involving use of an airwave for coupling the microwave energy into a bulb have been made for instance by Fusion Lighting Corporation as in their US Patent No. 5,334.913.
- the lamp is bulky, because the physical size of the wave guide is a fraction of the wave length of the microwaves in air. This is not a problem for street lighting for instance but renders this type of light unsuitable for many applications.
- our '2018 lamp uses a dielectric wave-guide, which substantially reduces the wave length at the operating frequency of 2.4Ghz. This lamp is suitable for use in domestic appliances such as rear projection television.
- a solid plasma crucible of material which is transparent or translucent for exit therefrom the plasma crucible having a sealed void in the plasma crucible, • a Faraday cage surrounding the plasma crucible, the cage being at least partially light transmitting for light exit from the plasma crucible, whilst being microwave enclosing,
- the arrangement being such that light from a plasma in the void can pass through the plasma crucible and radiate from it via the cage.
- lucent means that the material, of which the item described as lucent, is transparent or translucent
- plasma crucible means a closed body enclosing a plasma, the latter being in the void when the latter's fill is excited by microwave energy from the antenna.
- the object of the present invention is to provide an improved a light source to be powered by microwave energy.
- a light source to be powered by microwave energy having:
- a fill sealed in the plasma enclosure, of material excitable by microwave energy to form a light emitting plasma
- connection extending outside the body for coupling to a source of microwave energy.
- both the body and the enclosure will of the same material, preferably quartz.
- the sealed plasma enclosure is formed of drawn quartz rube, drawing of the tube providing a smooth internal bore.
- the tube can be accommodated in a bore in the dielectric body with a gap.
- This arrangement provides a smooth bore of the enclosure and isolates any stress raising cracks in the bore in the dielectric body from the intense heat of the plasma.
- the gap is such as to be negligible in terms of microwave resonance in the body, within the Faraday cage.
- the tubular enclosure could sealed with fused on quartz caps and the entire structure inserted in the bore in the body. It can be located by fusing of the caps to the body, particularly where this is of quartz. However, such a construction does not lend itself to easy fabrication.
- the enclosure will be formed by necking down tube of the enclosure. After filling and sealing, the necked down portions can be supported by discs fused across ends of the void.
- At least one tubular portion outwards of the necked down portion of the enclosure tube is un-necked and is fused to the body.
- the or each tubular portion outwards of the necked down portion can be upset to fit the void for fusing to it.
- one or two tubular portions outwards of the necked down portions of the enclosure tube are fused into one or two respective tubular pieces attached to face or faces of the body at its void having the enclosure.
- the enclosure can held at one end only by a tubular piece, with the other end of the void being open.
- the enclosure can again be held at one end only by a tubular piece, with the other end of the void being closed.
- the bore in the body will be larger than the outside diameter of the plasma enclosure, allowing a thermal barrier between the enclosure and the body.
- the enclosure is sealed with little necking, leaving a piece of its original tubing attached. This provides accommodation for the antenna to extend into the body without need for a separate antenna bore in the body.
- the tube extends out of the body and is attached to a further tube extending back to the body, thereby providing a long thermal path between enclosure and the body.
- Any gap between the enclosure and the body is preferably sealed
- the gap can be evacuated for further thermal isolation or can be filled with a gas, typically an inert gas such as nitrogen. Whilst some convection of the nitrogen can be expected, this arrangement still provides appreciable insulation of the plasma enclosure from the dielectric body.
- Figure 1 is a diagrammatic perspec tive view of a light source according to the invention.
- Figure 2 is a cross-sectional side vi ew of a microwave resonant body including a bulb included in the light source of Figure 1 ;
- Figure 3 is a similar view of a second resonant body
- Figure 4 is a similar view of a third resonant body
- Figure 5 is a similar view of a fourth resonant body; and Figure 6 is a similar view of a variant of the fourth resonant body.
- a lamp 1 of the invention is powered by a magnetron 2 via a coupling circuit 3. Details of the latter are given in our co-pending patent application No 0907947.6, dated 8 th May 2009. Since they form no part of the present invention as such, they will not be described in further detail.
- the lamp has microwave resonant body 11 of transparent quartz. It is supported on an end face 4 of an aluminium end piece 5 of the coupling circuit 3.
- the body and the end piece are circular and of the same diameter, whereby a perforate Faraday cage 12 crossing an end face 14 of the body and its circular side 15 and clamped by a tensioned band 6 to the coupling end piece secures the body to end piece.
- the body has a central bore 16, having a sealed plasma enclosing bulb 17 inserted in it.
- the bulb is of quartz also and has an external diameter which is a close fit in the bore.
- the bulb itself is of drawn quartz tube 18 and as such has a smooth internal bore 19.
- End caps 20 are fused to the tube and encapsulate a charge of a material excitable to form a light emitting plasma in the bulb when microwaves are fed into the body via an antenna 7 in a bore 21 in the body.
- the body is sized to establish resonance within the Faraday cage in the body 1 1 , bulb 17 and fill containing void 22 within the bulb. There is negligible gap between the bulb and body, whereby they can be regarded as one for resonance purposes.
- the bulb is fixed in the body by seals 23.
- the bulb 31 is formed of drawn quartz tube, with necked-down seals 32. Again the tube is a close fit in the bore 33 in the body 34. At the ends of the bore, the necks are upset 35 and sealed 36 into the bore. The result is a structure with small spaces 37 inside the seals 36, but effectively for the purposes of resonance, it is a solid body having only a plasma void 38 in the bulb 31.
- FIG 4 there is shown a variant in which the bulb 51 of drawn quartz tube, with neck-down seals 52, is smaller in diameter than the bore 53 in the body 54.
- the bulb is supported in the body via its necks 55 being supported in apertured discs 56. These are sealed to both the necks and the body.
- the result is that the bulb is thermally insulated from the dielectric body and is able to run hotter with less heat being conducted to the body via the necks. Since quartz has a low coefficient of thermal expansion, it is expected that this structure will resist thermally induced stresses due to differential expansion of the bulb and the body. Nevertheless, the bulb can be located in the bore 53 at one end only to one apertured disc 56, with the disc at the other end not being apertured.
- the sealed space 57 surrounding the bulb can be evacuated prior to sealing or filed with inert gas such as nitrogen. Whether the space is evacuated or filled with gas, it will have a small and theoretical determinable effect on the microwave frequency at which resonance is established in the body.
- the further embodiment shown in Figure 5 has a bulb 71 also of drawn quartz tube, having a necked down seal 72 at one end, beyond which the tube 81 continues away from the seal 72 at the full diameter of the diameter of the tube. As with the above embodiments, the tube is drawn and has a smooth, crack resistant interior. The end 82 of the bulb remote from the seal 72 is sealed and the bulb includes a charge or fill of excitable material able to support a plasma.
- the bulb is supported in a bore 73 in a transparent, resonant quartz body 74.
- the bore is sealed at its end equivalent to the bulb end 82, by means of a larger diameter piece of quartz tube 83 fused onto the body, then necked down and sealed off.
- Another piece of large diameter tube 84 is fused onto the opposite end of the body and surrounds the bulb tube 81 remote from the bulb.
- the distal ends of these two tubes are fused together, by necking the outer tube onto the inner tube, fusing them together and removing the excess of each. Conveniently this operation is performed prior to the necking down and sealing of the opposite end tube 83, whose necking and sealing excludes the ambient atmosphere from the sealed space 77 between the bulb and the bore of the resonant body.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Electromagnetism (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
Description
Claims
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10775849A EP2491574A1 (en) | 2009-10-21 | 2010-10-18 | Light source |
MX2012004665A MX2012004665A (en) | 2009-10-21 | 2010-10-18 | Light source. |
BR112012009636A BR112012009636A2 (en) | 2009-10-21 | 2010-10-18 | light source |
RU2012116184/07A RU2557795C9 (en) | 2009-10-21 | 2010-10-18 | Light source |
KR1020127012891A KR20120124388A (en) | 2009-10-21 | 2010-10-18 | Light source |
AU2010309654A AU2010309654A1 (en) | 2009-10-21 | 2010-10-18 | Light source |
CN201080046920.7A CN102687236B (en) | 2009-10-21 | 2010-10-18 | Light source |
CA2776675A CA2776675A1 (en) | 2009-10-21 | 2010-10-18 | Light source |
US13/501,048 US8823264B2 (en) | 2009-10-21 | 2010-10-18 | Light source |
JP2012534760A JP5663587B2 (en) | 2009-10-21 | 2010-10-18 | light source |
ZA2012/02545A ZA201202545B (en) | 2009-10-21 | 2012-04-10 | Light source |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0918515.8A GB0918515D0 (en) | 2009-10-21 | 2009-10-21 | Light source |
GB0918515.8 | 2009-10-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011048359A1 true WO2011048359A1 (en) | 2011-04-28 |
Family
ID=41426532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2010/001922 WO2011048359A1 (en) | 2009-10-21 | 2010-10-18 | Light source |
Country Status (14)
Country | Link |
---|---|
US (1) | US8823264B2 (en) |
EP (1) | EP2491574A1 (en) |
JP (1) | JP5663587B2 (en) |
KR (1) | KR20120124388A (en) |
CN (1) | CN102687236B (en) |
AU (1) | AU2010309654A1 (en) |
BR (1) | BR112012009636A2 (en) |
CA (1) | CA2776675A1 (en) |
CL (1) | CL2012000987A1 (en) |
GB (1) | GB0918515D0 (en) |
MX (1) | MX2012004665A (en) |
RU (1) | RU2557795C9 (en) |
WO (1) | WO2011048359A1 (en) |
ZA (1) | ZA201202545B (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8089203B2 (en) | 2007-11-16 | 2012-01-03 | Ceravision Limited | Light source |
WO2013004988A1 (en) * | 2011-07-01 | 2013-01-10 | Ceravision Limited | Plasma light source |
US8405290B2 (en) | 2008-11-14 | 2013-03-26 | Ceravision Limited | Light source for microwave powered lamp |
US8405291B2 (en) | 2008-11-14 | 2013-03-26 | Ceravision Limited | Microwave light source with solid dielectric waveguide |
WO2013041825A1 (en) * | 2011-09-19 | 2013-03-28 | Ceravision Limited | Crucible for a luwpl |
US8461761B2 (en) | 2007-11-16 | 2013-06-11 | Ceravision Limited | Lucent plasma crucible |
WO2014045044A1 (en) * | 2012-09-19 | 2014-03-27 | Ceravision Limited | Crucible for a luwpl |
CN103875058A (en) * | 2011-10-07 | 2014-06-18 | 塞拉维申有限公司 | Microwave driven electrodeless lamp comprising magnetron without forced convective cooling |
CN104428869A (en) * | 2012-05-10 | 2015-03-18 | 塞拉维申有限公司 | Lucent waveguide electromagnetic wave plasma light source |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9433070B2 (en) * | 2013-12-13 | 2016-08-30 | Kla-Tencor Corporation | Plasma cell with floating flange |
CN104064441B (en) * | 2014-06-12 | 2016-05-04 | 单家芳 | For the microwave cavity of plasma source |
GB201410669D0 (en) * | 2014-06-13 | 2014-07-30 | Ceravision Ltd | Light source |
CN109587925A (en) * | 2018-12-11 | 2019-04-05 | 北京铭安博运科技有限公司 | A kind of microwave plasma device |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5334913A (en) | 1993-01-13 | 1994-08-02 | Fusion Systems Corporation | Microwave powered lamp having a non-conductive reflector within the microwave cavity |
US20050057158A1 (en) * | 2000-07-31 | 2005-03-17 | Yian Chang | Plasma lamp with dielectric waveguide integrated with transparent bulb |
WO2006070190A1 (en) * | 2004-12-27 | 2006-07-06 | Ceravision Limited | Electrodeless incandescent bulb |
WO2006129102A2 (en) * | 2005-06-03 | 2006-12-07 | Ceravision Limited | Lamp |
US20070194683A1 (en) * | 2006-02-23 | 2007-08-23 | Koito Manufacturing Co., Ltd. | High-frequency discharge lamp |
US20070222352A1 (en) * | 2006-01-04 | 2007-09-27 | Devincentis Marc | Plasma lamp with field-concentrating antenna |
WO2009063205A2 (en) | 2007-11-16 | 2009-05-22 | Ceravision Limited | Microwave- powered light source |
Family Cites Families (6)
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US5834895A (en) * | 1990-10-25 | 1998-11-10 | Fusion Lighting, Inc. | Visible lamp including selenium |
TW359847B (en) * | 1996-11-01 | 1999-06-01 | Matsushita Electric Ind Co Ltd | High frequency discharge energy supply means and high frequency electrodeless discharge lamp device |
US6737809B2 (en) * | 2000-07-31 | 2004-05-18 | Luxim Corporation | Plasma lamp with dielectric waveguide |
US20050286263A1 (en) * | 2004-06-23 | 2005-12-29 | Champion David A | Plasma lamp with light-transmissive waveguide |
JP2009515294A (en) * | 2005-10-27 | 2009-04-09 | ラクシム コーポレーション | Plasma lamp with dielectric waveguide |
JP5557851B2 (en) * | 2008-11-14 | 2014-07-23 | セラビジョン・リミテッド | Microwave light source with solid dielectric waveguide |
-
2009
- 2009-10-21 GB GBGB0918515.8A patent/GB0918515D0/en not_active Ceased
-
2010
- 2010-10-18 AU AU2010309654A patent/AU2010309654A1/en not_active Abandoned
- 2010-10-18 JP JP2012534760A patent/JP5663587B2/en not_active Expired - Fee Related
- 2010-10-18 MX MX2012004665A patent/MX2012004665A/en active IP Right Grant
- 2010-10-18 CA CA2776675A patent/CA2776675A1/en not_active Abandoned
- 2010-10-18 KR KR1020127012891A patent/KR20120124388A/en not_active Application Discontinuation
- 2010-10-18 RU RU2012116184/07A patent/RU2557795C9/en not_active IP Right Cessation
- 2010-10-18 WO PCT/GB2010/001922 patent/WO2011048359A1/en active Application Filing
- 2010-10-18 BR BR112012009636A patent/BR112012009636A2/en not_active IP Right Cessation
- 2010-10-18 US US13/501,048 patent/US8823264B2/en not_active Expired - Fee Related
- 2010-10-18 CN CN201080046920.7A patent/CN102687236B/en not_active Expired - Fee Related
- 2010-10-18 EP EP10775849A patent/EP2491574A1/en not_active Withdrawn
-
2012
- 2012-04-10 ZA ZA2012/02545A patent/ZA201202545B/en unknown
- 2012-04-18 CL CL2012000987A patent/CL2012000987A1/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5334913A (en) | 1993-01-13 | 1994-08-02 | Fusion Systems Corporation | Microwave powered lamp having a non-conductive reflector within the microwave cavity |
US20050057158A1 (en) * | 2000-07-31 | 2005-03-17 | Yian Chang | Plasma lamp with dielectric waveguide integrated with transparent bulb |
WO2006070190A1 (en) * | 2004-12-27 | 2006-07-06 | Ceravision Limited | Electrodeless incandescent bulb |
WO2006129102A2 (en) * | 2005-06-03 | 2006-12-07 | Ceravision Limited | Lamp |
US20070222352A1 (en) * | 2006-01-04 | 2007-09-27 | Devincentis Marc | Plasma lamp with field-concentrating antenna |
US20070194683A1 (en) * | 2006-02-23 | 2007-08-23 | Koito Manufacturing Co., Ltd. | High-frequency discharge lamp |
WO2009063205A2 (en) | 2007-11-16 | 2009-05-22 | Ceravision Limited | Microwave- powered light source |
Non-Patent Citations (1)
Title |
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See also references of EP2491574A1 * |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8461751B2 (en) | 2007-11-16 | 2013-06-11 | Ceravision Limited | Light source |
US8089203B2 (en) | 2007-11-16 | 2012-01-03 | Ceravision Limited | Light source |
US8614543B2 (en) | 2007-11-16 | 2013-12-24 | Andrew Simon Neate | Light source |
US8461761B2 (en) | 2007-11-16 | 2013-06-11 | Ceravision Limited | Lucent plasma crucible |
US8405290B2 (en) | 2008-11-14 | 2013-03-26 | Ceravision Limited | Light source for microwave powered lamp |
US8405291B2 (en) | 2008-11-14 | 2013-03-26 | Ceravision Limited | Microwave light source with solid dielectric waveguide |
KR20140058534A (en) * | 2011-07-01 | 2014-05-14 | 세라비젼 리미티드 | Plasma light source |
JP2014525121A (en) * | 2011-07-01 | 2014-09-25 | セラビジョン・リミテッド | Plasma light source |
CN103688337A (en) * | 2011-07-01 | 2014-03-26 | 塞拉维申有限公司 | Plasma light source |
US9818597B2 (en) | 2011-07-01 | 2017-11-14 | Andrew Simon Neate | Lucent waveguide plasma light source |
WO2013004988A1 (en) * | 2011-07-01 | 2013-01-10 | Ceravision Limited | Plasma light source |
AU2012280102B2 (en) * | 2011-07-01 | 2017-02-09 | Ceravision Limited | Plasma light source |
CN103918056A (en) * | 2011-09-19 | 2014-07-09 | 塞拉维申有限公司 | Crucible for a LUWPL |
WO2013041825A1 (en) * | 2011-09-19 | 2013-03-28 | Ceravision Limited | Crucible for a luwpl |
CN103875058B (en) * | 2011-10-07 | 2016-09-14 | 塞拉维申有限公司 | The microwave driven electrodeless lamp comprising magnetron without forced convertion cooling |
CN103875058A (en) * | 2011-10-07 | 2014-06-18 | 塞拉维申有限公司 | Microwave driven electrodeless lamp comprising magnetron without forced convective cooling |
CN104428869A (en) * | 2012-05-10 | 2015-03-18 | 塞拉维申有限公司 | Lucent waveguide electromagnetic wave plasma light source |
JP2015528977A (en) * | 2012-05-10 | 2015-10-01 | セラビジョン リミテッド | Translucent waveguide electromagnetic wave plasma light source |
CN104956460A (en) * | 2012-09-19 | 2015-09-30 | 塞拉维申有限公司 | Crucible for a LUWPL |
JP2015529387A (en) * | 2012-09-19 | 2015-10-05 | セラビジョン リミテッド | LUWPL crucible |
WO2014045044A1 (en) * | 2012-09-19 | 2014-03-27 | Ceravision Limited | Crucible for a luwpl |
AU2013320002B2 (en) * | 2012-09-19 | 2017-11-23 | Ceravision Limited | Crucible for a LUWPL |
Also Published As
Publication number | Publication date |
---|---|
RU2012116184A (en) | 2013-10-27 |
US20120274210A1 (en) | 2012-11-01 |
CN102687236A (en) | 2012-09-19 |
JP2013508910A (en) | 2013-03-07 |
MX2012004665A (en) | 2012-10-05 |
RU2557795C2 (en) | 2015-07-27 |
CA2776675A1 (en) | 2011-04-28 |
AU2010309654A1 (en) | 2012-05-03 |
EP2491574A1 (en) | 2012-08-29 |
US8823264B2 (en) | 2014-09-02 |
GB0918515D0 (en) | 2009-12-09 |
ZA201202545B (en) | 2013-03-27 |
CL2012000987A1 (en) | 2012-06-29 |
KR20120124388A (en) | 2012-11-13 |
JP5663587B2 (en) | 2015-02-04 |
CN102687236B (en) | 2016-06-15 |
RU2557795C9 (en) | 2016-02-27 |
BR112012009636A2 (en) | 2016-05-17 |
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