EP2489062A2 - Électrode céramique pour une lampe à décharge haute pression - Google Patents

Électrode céramique pour une lampe à décharge haute pression

Info

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Withdrawn
Application number
EP10782224A
Other languages
German (de)
English (en)
Inventor
Philip Clissold Howell
Andreas Kloss
Khanh Pham Gia
Steffen Walter
Raquel De La Pena Alonso
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2489062A2 publication Critical patent/EP2489062A2/fr
Withdrawn legal-status Critical Current

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)

Abstract

L'invention concerne une électrode céramique comportant une tige et une tête, au moins une partie de la tête étant réalisée en matériau céramique, notamment en LaB6 ou en carbures d'hafnium et/ou de tantale.
EP10782224A 2009-12-22 2010-11-10 Électrode céramique pour une lampe à décharge haute pression Withdrawn EP2489062A2 (fr)

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 (fr) 2009-12-22 2010-11-10 Électrode céramique pour une lampe à décharge haute pression

Publications (1)

Publication Number Publication Date
EP2489062A2 true EP2489062A2 (fr) 2012-08-22

Family

ID=44304712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10782224A Withdrawn EP2489062A2 (fr) 2009-12-22 2010-11-10 Électrode céramique pour une lampe à décharge haute pression

Country Status (6)

Country Link
US (1) US8581493B2 (fr)
EP (1) EP2489062A2 (fr)
JP (1) JP5645965B2 (fr)
CN (1) CN102668018B (fr)
DE (1) DE102009055123A1 (fr)
WO (1) WO2011085839A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HUP1300405A2 (en) * 2010-10-19 2013-10-28 Osram Gmbh Ceramic bushing for a high-pressure discharge lamp
CN103298816A (zh) * 2010-12-17 2013-09-11 内尔维阿诺医学科学有限公司 作为激酶抑制剂的取代的吡唑并-喹唑啉衍生物
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)

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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 (fr) * 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
KR19990021836A (ko) 1996-03-22 1999-03-25 엠. 제이. 엠. 반캄 고압 금속 할로겐화물 램프
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
DE19835476A1 (de) * 1998-08-06 2000-02-10 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh 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

Non-Patent Citations (1)

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Title
See references of WO2011085839A2 *

Also Published As

Publication number Publication date
JP5645965B2 (ja) 2014-12-24
CN102668018A (zh) 2012-09-12
US8581493B2 (en) 2013-11-12
DE102009055123A1 (de) 2011-06-30
CN102668018B (zh) 2016-01-13
WO2011085839A3 (fr) 2011-10-20
US20120262051A1 (en) 2012-10-18
JP2013515337A (ja) 2013-05-02
WO2011085839A2 (fr) 2011-07-21

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