EP2489062A2 - Keramische elektrode für eine hochdruckentladungslampe - Google Patents
Keramische elektrode für eine hochdruckentladungslampeInfo
- Publication number
- EP2489062A2 EP2489062A2 EP10782224A EP10782224A EP2489062A2 EP 2489062 A2 EP2489062 A2 EP 2489062A2 EP 10782224 A EP10782224 A EP 10782224A EP 10782224 A EP10782224 A EP 10782224A EP 2489062 A2 EP2489062 A2 EP 2489062A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- head
- ceramic
- layer
- discharge lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
- H01J61/0737—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
Definitions
- the invention is based on a ceramic electrode for a high-pressure discharge lamp according to the preamble of claim 1.
- Sintered electrodes as such based on metals are previously known from US 6 218 025. From US 6 232718 and EP 1265 264 ceramic electrodes are known which use nitridic or oxidic material.
- a ceramic electrode which is designed as a layer and is made of LaE> 6 or CeE> 6.
- Such a layer electrode is produced by means of LTTC.
- the object of the present invention is to provide a loading Kera ⁇ mix electrode for a high pressure discharge lamp ride, which has a low electron work function.
- the novel electrode of the invention is a ceramic electrode having a shank and a head on it buildin ⁇ saturated.
- the head is cylindrical or similar.
- the head is designed either completely or in its outer layer of boride.
- the per se known LaB 6 or borides of Ce, Y, Yb is suitable.
- such materials are known in the lamp industry, but usually as an electron-emissive layer. So far, the possibility of forming a massive body has never been considered.
- These materials can be used as a ceramic solid or ceramic layer for the head. Also suitable as a coating are other materials listed in Tab.
- Typical layer thicknesses for such ceramic layers are in the range of 1 to 100 ⁇ m.
- ceramic hollow bodies mostly of Al 2 O 3 (PCA) are used for the discharge vessel of a high-pressure discharge lamp. They are usually made by low-pressure Einsprit zen in an appropriate form. Two half-shells produced in this way, on which capillaries are attached, are welded together in green and then sintered in a gastight manner. The electrode systems are melted by means of glass solder into the Kapilla ⁇ reindeer, after a usually metal halides containing filling was introduced. Typically, the electrode heads made of metal are ge ⁇ manufactures having the highest possible melting point.
- Tungsten which has an electron work function of 4.54 eV is suitable.
- the temperature at the tip of the electrode reaches approximately 3100 K during operation.
- the discharge vessel is covered with electrodes.
- One or two electrodes can be used. These can be designed with a full-surface layer on the head, which preferably consists of LaB6.
- the head of the electrode has a substantially rounded or tapered shape.
- Table 3 compares important characteristics of previously known and inventive embodiments of electrodes, for example with reference to tungsten and LaB 6 .
- the eV to about 2 lower work function of LaB 6 ge ⁇ genüber tungsten leads to an experimentally determined temperature reduction at the tip of the electrode at about 1300 K compared to tungsten, on which it is typical value of 3100 K.
- a material such as LaB6 is korrosionsbestän ⁇ dig against rare earth iodides as a component of the filling. This further increases the service life. Overall, therefore, give advantage by lower operating temperature, reduced thermal losses hö ⁇ here efficiency, save electricity, low color spread, higher reliability, high speed Bestän ⁇ against corrosion.
- a filling which is free of mercury can be used.
- a concrete method of applying a coating is the sol-gel method known per se.
- carbides of Ta and / or Hf thin coating layers of per se highly heat-resistant bodies of metals such as tungsten are possible.
- the main body of tungsten, etc. in solutions of precursors, which then lead to the formation of carbides, are dipped.
- the electrode heads are llibrary pyro- in egg ⁇ nem furnace at temperatures 1800-2100 ° C and the coating permanently bonded to the base body.
- This provides a cost-effective coating process. This can be integrated effortlessly into the existing Fer ⁇ actuation line.
- sol-gel process allows a wide variability in the layer thickness of a few nm to tens of eini ⁇ gen ym.
- solid ceramic body is possible.
- fibers from a material such as (TaO, 9Hf0, 1) C is possible.
- FIG. 1 discharge vessel with two electrodes
- FIG. 2 shows an electrode with a ceramic head
- FIG. 3 shows an electrode as a solid body
- Figure 4 is an electrode with coating in rounded
- Figure 5 and 6 an electrode with coating in tapered shape.
- FIG. 1 shows a ceramic discharge vessel 1 with a cylindrical central part 2 and two capillaries 3. A filling with metal halides is introduced into the cavity 4 of the middle part.
- an electrode system 5 is sealed by means of glass solder.
- the electrode system 5 has an external power supply 6, a feedthrough 7 and an electrode 8.
- the electrode has a shaft 9 and a head 10.
- Figure 2 shows an electrode 8 in detail. It has a shaft 9 made of tungsten, on which a cylindrical head 10 from LaB 6 sits.
- the head is made of ceramic.
- FIG. 3 shows a second embodiment of an electrode 8.
- the head 10 is made up of a base body 11 made of tungsten, which is surrounded on the outside by a ceramic layer 12 of YBe.
- a ceramic layer 12 of YBe Alternatively, in particular Tao, 9 Hf 0 , iC is used here.
- FIG. 4 shows an exemplary embodiment in which the entire electrode 8, head 9 and shaft 10, is made of a ceramic material, namely TaC.
- FIG. 5 shows an electrode 8, in which the head 10 consists of main body 11 and outer layer 12. The main body 11 is cylindrical and has a rounded tip 15. The head is de charge side with a layer 12 of CeB 6 covered.
- FIG. 6 shows an electrode 8, in which the head 10 tapers towards the tip in a conical manner .
- the main body 11 is made of tungsten.
- a layer 12 of YbE> 6 is applied.
- Essential features of the invention in the form of a nume ⁇ tured list are:
- electrode for a high-pressure discharge lamp which consists of shaft and mounted thereon head, wherein at least a portion of the head consists of ceramic material, characterized in that the ke ⁇ ramische material is a boride or carbide.
- An electrode according to claim 1 characterized in that at least one layer is arranged on a base body made of metal.
- An electrode according to claim 2 characterized in that the layer consists of at least one of the borides of La, Y, Yb or Ce or at least one of the carbides of Ta or Hf.
- An electrode according to claim 1 characterized in that the head is made entirely of ceramic material.
- An electrode according to claim 2 characterized in that the layer is prepared according to sol-gel technique.
Landscapes
- Discharge Lamp (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009055123A DE102009055123A1 (de) | 2009-12-22 | 2009-12-22 | Keramische Elektrode für eine Hochdruckentladungslampe |
PCT/EP2010/067173 WO2011085839A2 (de) | 2009-12-22 | 2010-11-10 | Keramische elektrode für eine hochdruckentladungslampe |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2489062A2 true EP2489062A2 (de) | 2012-08-22 |
Family
ID=44304712
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10782224A Withdrawn EP2489062A2 (de) | 2009-12-22 | 2010-11-10 | Keramische elektrode für eine hochdruckentladungslampe |
Country Status (6)
Country | Link |
---|---|
US (1) | US8581493B2 (ja) |
EP (1) | EP2489062A2 (ja) |
JP (1) | JP5645965B2 (ja) |
CN (1) | CN102668018B (ja) |
DE (1) | DE102009055123A1 (ja) |
WO (1) | WO2011085839A2 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012052054A1 (de) * | 2010-10-19 | 2012-04-26 | Osram Ag | Keramische durchführung für eine hochdruckentladungslampe |
RU2652638C2 (ru) * | 2010-12-17 | 2018-04-28 | НЕРВИАНО МЕДИКАЛ САЙЕНСИЗ С.р.л. | Замещенные пиразолхиназолиновые производные в качестве ингибиторов киназы |
DE102012213191A1 (de) | 2012-07-26 | 2014-01-30 | Osram Gmbh | 2hochdruckentladungslampe |
KR20150084406A (ko) | 2014-01-14 | 2015-07-22 | 엘지전자 주식회사 | 무전극 조명장치 |
DE102018206770A1 (de) * | 2018-05-02 | 2019-11-07 | Osram Gmbh | Elektrode für eine Entladungslampe, Entladungslampe und Verfahren zum Herstellen einer Elektrode |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB731421A (en) * | 1951-01-15 | 1955-06-08 | Gen Electric Co Ltd | Improvements in or relating to thermionic cathodes |
JPS6319750A (ja) | 1986-07-14 | 1988-01-27 | Hitachi Ltd | 低圧放電灯 |
JPS6486439A (en) | 1987-09-29 | 1989-03-31 | Semiconductor Energy Lab | Lamp for ultraviolet illuminant |
JPH04174951A (ja) * | 1990-07-19 | 1992-06-23 | Tokyo Densoku Kk | 放電管 |
TW270211B (ja) * | 1993-03-17 | 1996-02-11 | Tdk Electronics Co Ltd | |
JPH07122234A (ja) * | 1993-10-22 | 1995-05-12 | Matsushita Electric Ind Co Ltd | 高圧放電灯 |
GB9413973D0 (en) * | 1994-07-11 | 1994-08-31 | Rank Brimar Ltd | Electrode structure |
JP3436609B2 (ja) * | 1995-04-26 | 2003-08-11 | 電気化学工業株式会社 | 放電管及びその製造法 |
JPH08376U (ja) * | 1995-09-04 | 1996-02-20 | ウシオ電機株式会社 | ショートアーク型水銀蒸気放電灯 |
WO1997036311A1 (en) | 1996-03-22 | 1997-10-02 | Philips Electronics N.V. | High pressure metal halide lamp |
JPH1083792A (ja) * | 1996-09-09 | 1998-03-31 | Mitsubishi Electric Corp | 放電灯 |
DE19652822A1 (de) | 1996-12-18 | 1998-06-25 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Sinterelektrode |
JP3648900B2 (ja) * | 1997-01-21 | 2005-05-18 | 松下電工株式会社 | 金属蒸気放電灯 |
CN1249063A (zh) * | 1997-12-26 | 2000-03-29 | 东芝照明技术株式会社 | 电子发射电极结构、放电灯及放电灯装置 |
DE29823366U1 (de) * | 1998-08-06 | 1999-07-08 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 81543 München | Elektrode für eine Hochdruckentladungslampe mit langer Lebensdauer |
US6232718B1 (en) | 1999-03-02 | 2001-05-15 | Osray Sylvania Inc. | Ceramic feedthroughs for discharge lamps |
US6356019B1 (en) * | 1999-06-22 | 2002-03-12 | Osram Sylvania Inc. | Fluorescent lamp and methods for making electrode assemblies for fluorescent lamps |
DE10128139A1 (de) | 2001-06-09 | 2002-12-12 | Philips Corp Intellectual Pty | Gasentladungslampe und Verfahren zu deren Herstellung |
DE10301478A1 (de) * | 2003-01-16 | 2004-07-29 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Elektrode für eine Hochdruckentladungslampe |
DE202006002833U1 (de) * | 2006-02-22 | 2006-05-04 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Hochdruckentladungslampe mit keramischem Entladungsgefäß |
DE102008063620A1 (de) | 2008-12-18 | 2010-06-24 | Osram Gesellschaft mit beschränkter Haftung | Keramisches Entladungsgefäß für eine Hochdruckentladungslampe |
-
2009
- 2009-12-22 DE DE102009055123A patent/DE102009055123A1/de not_active Withdrawn
-
2010
- 2010-11-10 EP EP10782224A patent/EP2489062A2/de not_active Withdrawn
- 2010-11-10 JP JP2012545183A patent/JP5645965B2/ja not_active Expired - Fee Related
- 2010-11-10 US US13/515,825 patent/US8581493B2/en not_active Expired - Fee Related
- 2010-11-10 CN CN201080059314.9A patent/CN102668018B/zh not_active Expired - Fee Related
- 2010-11-10 WO PCT/EP2010/067173 patent/WO2011085839A2/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011085839A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2011085839A3 (de) | 2011-10-20 |
US8581493B2 (en) | 2013-11-12 |
JP2013515337A (ja) | 2013-05-02 |
CN102668018B (zh) | 2016-01-13 |
DE102009055123A1 (de) | 2011-06-30 |
CN102668018A (zh) | 2012-09-12 |
US20120262051A1 (en) | 2012-10-18 |
JP5645965B2 (ja) | 2014-12-24 |
WO2011085839A2 (de) | 2011-07-21 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20120511 |
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AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRAM GMBH |
|
DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRAM GMBH |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20140603 |