EP0869540A1 - Metallhalogenidentladungslampe mit keramischem Entladungsgefäss und Herstellungsverfahren - Google Patents

Metallhalogenidentladungslampe mit keramischem Entladungsgefäss und Herstellungsverfahren Download PDF

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Publication number
EP0869540A1
EP0869540A1 EP98302182A EP98302182A EP0869540A1 EP 0869540 A1 EP0869540 A1 EP 0869540A1 EP 98302182 A EP98302182 A EP 98302182A EP 98302182 A EP98302182 A EP 98302182A EP 0869540 A1 EP0869540 A1 EP 0869540A1
Authority
EP
European Patent Office
Prior art keywords
arc tube
zirconium oxide
metal halide
lamp
arc
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Withdrawn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
EP98302182A
Other languages
English (en)
French (fr)
Inventor
Changlong Ning
G.E. Coxon
Edwin C. Odell
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of EP0869540A1 publication Critical patent/EP0869540A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings

Definitions

  • This invention relates to a ceramic metal halide arc lamp and to a method of making it.
  • CMH ceramic metal halide
  • the invention therefore seeks to provide a ceramic metal halide arc lamp and a method of producing it in which it is possible to increase the vapour pressure of the metal halide in the arc plasma during operation while substantially avoiding the above-mentioned disadvantages of currently proposed solutions.
  • a ceramic metal halide arc lamp comprises an arc tube, a metal halide fill and a coating of zirconium oxide on at least part of the arc tube.
  • the ceramic used is alumina and the zirconium oxide coating is applied at least to the end plug of the arc tube.
  • the zirconium oxide coating may also be applied to the legs of the arc tube.
  • a method of making a ceramic metal halide lamp comprises forming a ceramic arc tube and dipping at least part of the arc tube in a zirconium oxide suspension to provide a coating on at least part of the arc tube.
  • the end plug of the arc tube which is dipped in the zirconium oxide suspension.
  • both the end plug and the legs of the arc tube can be dipped in the zirconium oxide suspension.
  • the arc tube may be dried out and placed in a furnace at between 400 and 500°C for between 15 and 30 minutes.
  • an alumina arc tube 1 having end plugs 3 at each end and legs 5 extending outwardly from the end plugs 3.
  • the arc tube as can be seen, is provided with a zirconium oxide (Z r 0 2 ) coating 7 on the exterior of the end plugs 3 and around the legs 5.
  • Z r 0 2 zirconium oxide
  • both ends of the arc tube are dipped into a suspension of the zirconium oxide so that the zirconium oxide is deposited on the end plugs 3 and around the legs 5.
  • the arc tube may need to be dipped twice.
  • the arc tube is dried off and then is placed in a furnace at a temperature of between 400 and 500°C (in particular 460°C) for a period of between 15 and 30 minutes (preferably 20 minutes). The arc tube is then ready for assembly including the insertion of the fill in known manner.
  • vapour pressure increases sufficiently to provide acceptable control of the colour temperature of the lamp without the necessity of taking any action which would cause a reduction in the life of the lamp.
  • Tests were carried out on a trial lamp initially uncoated, its colour-power curve being taken for the uncoated arc tube.
  • the arc tube was thereafter coated on its ends with a zirconium oxide film.
  • the arc tube was re-assembled and run for seven hours and the colour power curve was again measured.
  • Figure 2 shows the results of this test in which the graph 20 represents the uncoated lamp and the graph 21 represents the coated lamp. From this it will be seen that the colour power curve of the bare arc tube did not reach a minimum even at 90 watts while that of the coated arc tube shows a clear minimum at around 80 watts. This indicates that the arc tube temperature was higher and better colour control was possible.
  • a second test was then carried out with bare and coated arc tubes.
  • the zirconium oxide coating was baked in a furnace at 460°C for twenty minutes. This baking of the coating avoids the so-called oxygen defect in which the zirconium oxide is converted into pure zirconium.
  • Figures 3 and 4 show graphs of the comparison between the coated and uncoated lamps on the basis of the colour power curve ( Figure 3) and the lumen output ( Figure 4).
  • the invention provides an improvement to ceramic metal halide lamps which enables good colour control while maintaining an acceptable life of the lamp.
EP98302182A 1997-04-04 1998-03-24 Metallhalogenidentladungslampe mit keramischem Entladungsgefäss und Herstellungsverfahren Withdrawn EP0869540A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9707291.2A GB9707291D0 (en) 1997-04-04 1997-04-04 Ceramic metal halide arc lamp and method of making it
GB9707291 1997-04-04

Publications (1)

Publication Number Publication Date
EP0869540A1 true EP0869540A1 (de) 1998-10-07

Family

ID=10810600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98302182A Withdrawn EP0869540A1 (de) 1997-04-04 1998-03-24 Metallhalogenidentladungslampe mit keramischem Entladungsgefäss und Herstellungsverfahren

Country Status (3)

Country Link
EP (1) EP0869540A1 (de)
JP (1) JPH10335059A (de)
GB (1) GB9707291D0 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1220294A1 (de) * 2000-12-19 2002-07-03 Philips Corporate Intellectual Property GmbH Hochdruckentladungslampe
US7211954B2 (en) 2005-03-09 2007-05-01 General Electric Company Discharge tubes
US7279838B2 (en) 2005-03-09 2007-10-09 General Electric Company Discharge tubes
US7474057B2 (en) 2005-11-29 2009-01-06 General Electric Company High mercury density ceramic metal halide lamp
EP2172961A1 (de) 2008-09-04 2010-04-07 Ngk Insulators, Ltd. Entladungsgefäss für Entladungslampen hoher Intensität
EP2190005A2 (de) 2008-11-25 2010-05-26 Ngk Insulators, Ltd. Entladungsgefäss für eine Hochdruckentladungslampe und Hochdruckentladungslampe
US7777418B2 (en) 2008-04-08 2010-08-17 General Electric Company Ceramic metal halide lamp incorporating a metallic halide getter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4880904B2 (ja) * 2005-02-15 2012-02-22 新光電気工業株式会社 放電管

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374377A (en) * 1965-04-21 1968-03-19 Gen Electric Metal vapor lamp coating
DE2634533A1 (de) * 1975-08-04 1977-02-10 Gen Electric Kolben aus glasartigem siliciumdioxid mit einem optisch reflektierenden ueberzug aus aluminiumoxidteilchen
GB2036420A (en) * 1978-12-01 1980-06-25 Thorn Electrical Ind Ltd Electric Discharge Lamps
US4281267A (en) * 1979-05-14 1981-07-28 General Electric Company High intensity discharge lamp with coating on arc discharge tube
EP0587238A1 (de) * 1992-09-08 1994-03-16 Koninklijke Philips Electronics N.V. Hochdruckentladungslampe
EP0602927A1 (de) * 1992-12-18 1994-06-22 General Electric Company Überzogene Bogenröhre für Natriumdampflampe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374377A (en) * 1965-04-21 1968-03-19 Gen Electric Metal vapor lamp coating
DE2634533A1 (de) * 1975-08-04 1977-02-10 Gen Electric Kolben aus glasartigem siliciumdioxid mit einem optisch reflektierenden ueberzug aus aluminiumoxidteilchen
GB2036420A (en) * 1978-12-01 1980-06-25 Thorn Electrical Ind Ltd Electric Discharge Lamps
US4281267A (en) * 1979-05-14 1981-07-28 General Electric Company High intensity discharge lamp with coating on arc discharge tube
EP0587238A1 (de) * 1992-09-08 1994-03-16 Koninklijke Philips Electronics N.V. Hochdruckentladungslampe
EP0602927A1 (de) * 1992-12-18 1994-06-22 General Electric Company Überzogene Bogenröhre für Natriumdampflampe

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1220294A1 (de) * 2000-12-19 2002-07-03 Philips Corporate Intellectual Property GmbH Hochdruckentladungslampe
US6727650B2 (en) 2000-12-19 2004-04-27 Koninklijke Philips Electronics N.V. High pressure discharge lamp with reflection layer on the neck portion
US7211954B2 (en) 2005-03-09 2007-05-01 General Electric Company Discharge tubes
US7279838B2 (en) 2005-03-09 2007-10-09 General Electric Company Discharge tubes
US7327085B2 (en) 2005-03-09 2008-02-05 General Electric Company Discharge tubes
US7474057B2 (en) 2005-11-29 2009-01-06 General Electric Company High mercury density ceramic metal halide lamp
US7777418B2 (en) 2008-04-08 2010-08-17 General Electric Company Ceramic metal halide lamp incorporating a metallic halide getter
EP2172961A1 (de) 2008-09-04 2010-04-07 Ngk Insulators, Ltd. Entladungsgefäss für Entladungslampen hoher Intensität
EP2190005A2 (de) 2008-11-25 2010-05-26 Ngk Insulators, Ltd. Entladungsgefäss für eine Hochdruckentladungslampe und Hochdruckentladungslampe
EP2190005A3 (de) * 2008-11-25 2012-07-11 NGK Insulators, Ltd. Entladungsgefäss für eine Hochdruckentladungslampe und Hochdruckentladungslampe

Also Published As

Publication number Publication date
GB9707291D0 (en) 1997-05-28
JPH10335059A (ja) 1998-12-18

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