EP0759633B1 - Hochdruckentladungslampe - Google Patents

Hochdruckentladungslampe Download PDF

Info

Publication number
EP0759633B1
EP0759633B1 EP96111638A EP96111638A EP0759633B1 EP 0759633 B1 EP0759633 B1 EP 0759633B1 EP 96111638 A EP96111638 A EP 96111638A EP 96111638 A EP96111638 A EP 96111638A EP 0759633 B1 EP0759633 B1 EP 0759633B1
Authority
EP
European Patent Office
Prior art keywords
sintered body
discharge lamp
pressure discharge
oxide
lamp according
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.)
Expired - Lifetime
Application number
EP96111638A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0759633A1 (de
Inventor
Albert Rademacher
Ulrich Rösner
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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0759633A1 publication Critical patent/EP0759633A1/de
Application granted granted Critical
Publication of EP0759633B1 publication Critical patent/EP0759633B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • 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
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
    • 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

Definitions

  • the invention relates to a high-pressure discharge lamp according to the preamble of claim 1.
  • Such a high-pressure discharge lamp is, for example, in Japanese Patent application JP 55-155457 disclosed.
  • This patent application describes a high-pressure discharge lamp with electrodes that one in the Discharge space protruding metal rod and a containing lanthanum oxide have cylindrical sintered body and an electrode coil.
  • the sintered body is arranged at the free end of the metal rod and from surrounding the electrode coil.
  • the electrode coil also encloses this end of the metallic electrode rod facing the sintered body.
  • the Sintered body is designed as an electron emitter. It contains no radioactive Thorium oxide, but consists of lanthanum oxide, yttrium oxide and tungsten, where lanthanum oxide and yttrium oxide together make up a proportion by weight of 0.2-60% on the sintered body.
  • the ratio of lanthanum oxide to yttrium oxide is 0.5-50 mole percent.
  • the disadvantage is that this electron emitter insufficient thermal over the life of the lamp Has stability.
  • a high-pressure discharge lamp is also in the published patent application EP 0 647 964 disclosed with a non-radioactive electron emitter.
  • This Electron emitter consists of a first metal oxide with a comparatively high electron work function, from the group hafnium oxide and zirconium oxide is selected, and with a second metal oxide comparatively low electron work function, that from the group yttrium oxide, Lanthanum oxide, cerium oxide and scandium oxide is selected.
  • This Electron emitter has a relatively large number of components, is over the life of the lamp not sufficiently thermally stable and is in the discharge not color neutral.
  • Japanese laid-open patent publication JP-A-63257177 describes a high-pressure discharge lamp with a lamp electrode, the tip of which Tungsten containing lanthanum oxide. Because the lanthanum oxide is less Has electron work function as tungsten, the Ignition voltage of the high-pressure discharge lamp reduced.
  • the American patent US 4,319,158 discloses an electrode for a high-pressure discharge lamp with an electron emitter, which contains both lanthanum oxide and yttrium oxide. Of the Emitter contains 0.5 to 80 mole percent lanthanum oxide and 99.5 to 20 mole percent Yttrium oxide.
  • a high-pressure discharge lamp with a to provide improved electron emitter in particular a has sufficient thermal stability over the life of the lamp and a good ignitability of the lamp with as little blackening of the lamp as possible Discharge vessel guaranteed.
  • the high-pressure discharge lamp according to the invention has electrodes that are equipped with a sintered body acting as an electron emitter.
  • the sintered body is surrounded by an electrode coil and contains according to the invention at least 90 percent by weight lanthanum oxide. This gives the sintered body has a high lifetime thermal stability and causes no significant blackening of the Discharge vessel.
  • the lamp with this electron emitter a good ignitability.
  • the sintered body consists exclusively of Lanthanum oxide. This sintered body has a very high thermal stability and causes practically no blackening of the discharge vessel over the total lamp life.
  • Embodiment contains the sintered body in addition to Lanthanum oxide yet another electron emitter consisting of the two Components barium oxide and tungsten oxide, which are made from a eutectic Mixture of barium carbonate and tungsten oxide has emerged.
  • This further electron emitter to Lanthanum oxide still ignites the high-pressure discharge lamp improved and the blackening behavior compared to the first embodiment deteriorated only marginally.
  • the end of the electron coil on the discharge side advantageously protrudes beyond the sintered body and has a narrowed inner diameter, which is smaller than the diameter of the sintered body while the other end of the electrode coil is the one adjacent to the sintered body Encloses the electrode rod end. This measure will on the one hand improves the fixation of the sintered body on the electrode rod and on the other hand, the blackening of the discharge vessel by sputtering Emitter material further reduced.
  • the discharge vessel 1 is essentially cylindrical and consists of Quartz glass and has two gas-tight ends la, 1b, in each an electrode system is melted in a known manner.
  • the Electrodes each have a power supply 2, which is melted via a molybdenum foil 3 with one made of a high-melting metal, such as molybdenum or tungsten, existing electrode rod 4 is connected.
  • the electrode rods 4 end in the discharge space and are aligned axially in the discharge vessel 1. At the discharge end the electrode rod 4 is wrapped by an electrode coil 6 Sintered body 5 attached. Details of the lamp electrodes are in the schematic Figure 2 shown.
  • the electrode coil 6 has two layers executed.
  • the diameter of the electrode rod 4 is for a high-pressure metal halide discharge lamp with an electrical power consumption of approx. 2000 W, corresponding to the one to be described here two embodiments, approximately 1.0 mm.
  • the diameter of the sintered body 5 is only slightly smaller.
  • the electrode coil 6 is on the end of the electrode rod 4 pushed on the discharge side. Encloses them the sintered body 5 and the end of the electrode rod 4 on the discharge side tight and also projects beyond the discharge end of the sintered body 5 out.
  • the inside diameter of the electrode coil 6 is on the discharge side End narrowed to about 0.7 mm and thus smaller than that Diameter of the electrode rod 4 and the sintered body 5.
  • the diameter of the spiral wire is approximately 0.8 mm.
  • the sintered body 5 consists exclusively of lanthanum oxide. He has a mass of approx. 10 mg.
  • the second embodiment differs only in the composition of the sintered body 5 from the first embodiment.
  • the sintered body 5 consists of 95.1 percent by weight Lanthanum oxide and 4.9 percent by weight of another electron emitter, which in turn consists of barium oxide and tungsten oxide.
  • the total weight of the sintered body is approximately 10 mg.
  • To manufacture the Sintered body 5 is a eutectic mixture of barium carbonate and Tungsten oxide, i.e. 22.04 percent by weight barium carbonate with 77.96 percent by weight Tungsten oxide, which is then produced with the addition of HO binder with which lanthanum oxide is mixed.
  • This batch is pressed into bars, cut and sintered in a hydrogen atmosphere. During the Sintering process, the binder is heated and the barium carbonate in barium oxide converted.
  • the invention is not limited to the exemplary embodiments described in more detail above.
  • the sintered body according to the invention can also be used in others Types of high pressure discharge lamps can be used. To have to only the dimensions and the mass of the sintered body accordingly be adjusted.

Landscapes

  • Discharge Lamp (AREA)
EP96111638A 1995-08-17 1996-07-18 Hochdruckentladungslampe Expired - Lifetime EP0759633B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19530293 1995-08-17
DE19530293A DE19530293A1 (de) 1995-08-17 1995-08-17 Hochdruckentladungslampe

Publications (2)

Publication Number Publication Date
EP0759633A1 EP0759633A1 (de) 1997-02-26
EP0759633B1 true EP0759633B1 (de) 1999-09-22

Family

ID=7769731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96111638A Expired - Lifetime EP0759633B1 (de) 1995-08-17 1996-07-18 Hochdruckentladungslampe

Country Status (6)

Country Link
US (1) US5712531A (ja)
EP (1) EP0759633B1 (ja)
JP (1) JPH0963535A (ja)
CA (1) CA2183481A1 (ja)
DE (2) DE19530293A1 (ja)
HU (1) HU215045B (ja)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004019185A1 (de) 2004-04-16 2005-11-10 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Hochdruckentladungslampe
US7176632B2 (en) * 2005-03-15 2007-02-13 Osram Sylvania Inc. Slotted electrode for high intensity discharge lamp
US7633226B2 (en) * 2005-11-30 2009-12-15 General Electric Company Electrode materials for electric lamps and methods of manufacture thereof
US7893617B2 (en) * 2006-03-01 2011-02-22 General Electric Company Metal electrodes for electric plasma discharge devices
CN101459031B (zh) * 2008-12-17 2010-09-29 海宁新光阳光电有限公司 陶瓷金属卤化物灯专用电极组件、电弧管及其制造方法
CN103219221A (zh) * 2013-04-07 2013-07-24 复旦大学 一种直螺旋套筒式电极及其应用

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2087545A5 (ja) * 1970-05-22 1971-12-31 Lampes Sa
FR2133088A6 (en) * 1971-04-07 1972-11-24 Lampes Sa Thorium emitter electrode - for discharge lamps wherein thorium pellets are heated to 2000 C in mfr
JPS5842587B2 (ja) * 1975-01-27 1983-09-20 三菱電機株式会社 ホウデントウヨウデンキヨク
NL175771B (nl) * 1975-06-20 1984-07-16 Philips Nv Hogedrukgasontladingslamp en een werkwijze voor de vervaardiging hiervan.
DE2951741C2 (de) * 1978-12-29 1984-05-30 Mitsubishi Denki K.K., Tokio/Tokyo Elektrode für eine Entladungslampe
JPS63257177A (ja) * 1987-04-13 1988-10-25 Hitachi Ltd 超高圧水銀灯
BE1007595A3 (nl) * 1993-10-07 1995-08-16 Philips Electronics Nv Hogedruk-metaalhalogenide-ontladingslamp.

Also Published As

Publication number Publication date
US5712531A (en) 1998-01-27
JPH0963535A (ja) 1997-03-07
CA2183481A1 (en) 1997-02-18
DE19530293A1 (de) 1997-02-20
HU9602280D0 (en) 1996-10-28
HU215045B (hu) 1998-09-28
DE59603137D1 (de) 1999-10-28
EP0759633A1 (de) 1997-02-26
HUP9602280A1 (en) 1997-11-28

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