EP2153457A2 - Lampe à décharge haute pression - Google Patents

Lampe à décharge haute pression

Info

Publication number
EP2153457A2
EP2153457A2 EP08749871A EP08749871A EP2153457A2 EP 2153457 A2 EP2153457 A2 EP 2153457A2 EP 08749871 A EP08749871 A EP 08749871A EP 08749871 A EP08749871 A EP 08749871A EP 2153457 A2 EP2153457 A2 EP 2153457A2
Authority
EP
European Patent Office
Prior art keywords
capillary
tungsten
discharge lamp
segment
pressure discharge
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Withdrawn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
EP08749871A
Other languages
German (de)
English (en)
Inventor
Roland Hüttinger
Andreas Kloss
Marko KÄNING
Klaus Stockwald
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 EP2153457A2 publication Critical patent/EP2153457A2/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Withdrawn legal-status Critical Current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
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H01J61/366—Seals for leading-in conductors
    • 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
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/32—Sealing leading-in conductors
    • H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827—Metal halide arc lamps

Definitions

  • the invention is based on a high-pressure discharge lamp with a ceramic discharge vessel according to the preamble of claim 1.
  • EP-A 926 703 discloses a high pressure discharge lamp in which an electrode system is composed of several parts. Two parts each consist of tungsten, namely the electrode shaft including a helix and a central leadthrough part. The electrode system further comprises a Mo coil pushed onto the leadthrough part and a terminal leadthrough part made of niobium.
  • the object of the present invention is to provide an electrode system for a high-pressure discharge lamp, which also withstands particularly aggressive fillings.
  • the electrode system is now made entirely of tungsten material, which also withstands particularly aggressive fillings.
  • the thermal expansion coefficient of tungsten is not adapted to ceramic capillaries as ends of a discharge vessel. Therefore, a novel construction is required.
  • the electrode itself so shaft and head, as well as the implementation system of W material is produced.
  • W can be provided with suitable dopants.
  • the entire system consists of four parts which are substantially cylindrically shaped. However, each of the four segments has a different diameter.
  • the transition zones between the segments can be designed arbitrarily, for example, be designed cone-shaped or stepped.
  • the electrode system can be made in one piece from a uniform material and manufactured in one piece, for example by removing the diameter, laser processing, etc.
  • the four segments consist of individual parts which are suitably assembled, for example by welding, soldering, a mechanical plug connection, etc.
  • the first segment is the electrode head.
  • the second segment is the electrode shaft whose diameter is smaller or at most equal to that of the head.
  • the third segment is a central execution part that fills the dead space in a capillary as well as possible. Be Diameter is preferably selected at 85 to 95% of the capillary inner diameter.
  • the fourth segment is the terminal leadthrough part, which is passed through the meltdown area at the end of the capillary and sealed there by means of glass solder.
  • the fourth segment is a tungsten core pin having a maximum diameter of 300 ⁇ m, which is additionally provided by a ceramic sleeve, in particular PCA or similar. is surrounded.
  • the sleeve is 0.3 ... 1.0 mm shorter in its axial length than the core pin that surrounds it.
  • This part is welded to a capillary-protruding niobium pin or pin of niob-like material in terms of thermal expansion coefficient.
  • the protruding pin and the weld are completely surrounded by a glass solder.
  • the entire electrode system is made of tungsten, it resists any aggressive filling. Thus, significant advantages over a Mo-containing electrode system can be achieved.
  • Another particular advantage of the novel electrode system is that the distance along the electrodes and the electrode feedthrough capillary is very uniform.
  • This electrode system is particularly well suited for metal halide fillings that completely or almost completely abstain from mercury.
  • FIG. 1 is a high pressure discharge lamp in section;
  • FIG. 2 shows an electrode system in the capillary.
  • FIG. 1 An embodiment of a metal halide high-pressure discharge lamp 1 is shown in FIG. 1. It has a ceramic discharge vessel 2 which is closed on two sides and is seated in an outer bulb 10. It is elongated and has at the two ends capillaries 3 with an inner diameter Dki and an axial length LK, see Figure 2. Inside the discharge vessel sit two electrodes 4 opposite each other, which are fixed to bushings 5. The bushings are guided through the capillaries 3 to the outside. The end of the passage is sealed by means of glass solder 19 in the capillary. The implementation is connected via a power supply 6 with a base contact 13 at the end of the outer bulb.
  • the filling is preferably Hg-free and contains in particular rare earth iodides such as cerium iodide and Aluminiumj odid and Thalliumj odid. Another possibility of filling is given for example in DE-A 102 54 969.
  • FIG. 2 shows the electrode system in detail.
  • the electrode has a head 7 made of tungsten with a diameter D1 and the axial length L1.
  • the head can be solid or formed by a helix.
  • This head is the first segment of the electrode system.
  • the electrode shaft 8 with the axial length L2, which is also made of tungsten.
  • Its diameter D2 is usually much smaller than that of Dl, but it can also be at most as large as that of Dl.
  • the electrode shaft 8 forms the second segment.
  • a central cylindrical front leadthrough part 9 made of tungsten. Its diameter D3 is larger than that of Dl. Its axial length is L3.
  • a composite lead-through part 10 It consists of a core pin 11 made of tungsten with a diameter D4 of preferably 200 to 300 microns. A practical lower limit for the diameter of the core pin is 100 ⁇ m.
  • the core pin 11 is surrounded by a tubular sleeve 12 having the axial length Lm. Their outer diameter Dma corresponds approximately to the diameter D3.
  • the cuff is preferably made of ceramic. It is made of Al2O3, mostly PCA, whereby the PCA can be doped or undoped.
  • Dmi an inner diameter adapted to the core pin 11.
  • Dmi an inner diameter adapted to the core pin 11.
  • D5 of the niobium pin should also be closely matched to the bore of the capillary.
  • Dl (0, 6 to s 0, 95) * Dki;
  • D2 (0.2 to 1.0) * D1, preferably (0.2 to 0.5) * D1;
  • the system dispenses with the use of molybdenum as the material for the feedthrough because molybdenum is not sufficiently resistant to corrosion.
  • the use of a wound as a constituent of the bushing has generally proved to be disadvantageous, since the inhomogeneous structure of a wound having a variable outer diameter leads to undesirable leaching in the capillary. Therefore, according to the invention, a molybdenum-free and stress-free system is first realized which is based on the material tungsten, that is to say predominantly tungsten, optionally with additives or as an alloy, and nevertheless ensures a reliable sealing by means of glass solder. This purpose is served by the ceramic sleeve in conjunction with the thin tungsten wire as the core pin.
  • the glass solder extends from the outside of the niobium pin to the beginning of the ceramic sleeve.
  • a glass solder are known per se known glass solders.
  • Niobium can be melted well known.
  • the coefficient of thermal expansion of tungsten is so large compared with ceramics that a maximum of one W pin with a diameter of 300 ⁇ m can be melted down.
  • the sleeve holds on the core pin, for example by a spot weld serves as a spacer.
  • the sum L1 + L2 + L3 + L4 is slightly longer than the capillary length LK, with the head of the electrode protruding from the capillary on one side and the fused niobium pin on the other side. It is advantageous if the sleeve rests loosely on the third segment. Compared to the niobium pin, it should be delimited by a gap having an axial length between 0.2 and 0.8 mm in order to take into account the different thermal expansion, to provide sufficient space for attachment and, above all, the glass solder sufficient to bring up to the W-pin, and thus to produce a reliable seal can.
  • the material of the outside end cap protruding from the capillary is of no importance; its decisive factor is the thermal expansion coefficient adapted to the ceramic, which is best achieved by niobium.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)

Abstract

Le système d'électrode associé à la lampe de l'invention est en tungstène et comporte quatre segments, à savoir une tête d'électrode, une tige d'électrode, un élément de passage central et un élément de passage terminal. L'élément de passage terminal est entouré d'une gaine céramique.
EP08749871A 2007-05-31 2008-04-29 Lampe à décharge haute pression Withdrawn EP2153457A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202007007688U DE202007007688U1 (de) 2007-05-31 2007-05-31 Hochdruckentladungslampe
PCT/EP2008/055270 WO2008145472A2 (fr) 2007-05-31 2008-04-29 Lampe à décharge haute pression

Publications (1)

Publication Number Publication Date
EP2153457A2 true EP2153457A2 (fr) 2010-02-17

Family

ID=39597890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08749871A Withdrawn EP2153457A2 (fr) 2007-05-31 2008-04-29 Lampe à décharge haute pression

Country Status (6)

Country Link
US (1) US20100176722A1 (fr)
EP (1) EP2153457A2 (fr)
JP (1) JP2010528439A (fr)
CN (1) CN101681790A (fr)
DE (1) DE202007007688U1 (fr)
WO (1) WO2008145472A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7369352B2 (ja) * 2020-01-29 2023-10-26 東芝ライテック株式会社 メタルハライドランプ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19727430A1 (de) * 1997-06-27 1999-01-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Metallhalogenidlampe mit keramischem Entladungsgefäß
JPH1196973A (ja) * 1997-09-25 1999-04-09 Toshiba Lighting & Technology Corp 高圧放電ランプおよび照明装置
JP3318250B2 (ja) 1997-12-26 2002-08-26 松下電器産業株式会社 金属蒸気放電ランプ
JPH11204083A (ja) * 1998-01-20 1999-07-30 Ushio Inc セラミック製放電ランプ
JP2000021350A (ja) * 1998-06-30 2000-01-21 Ushio Inc セラミック製放電ランプ
DE10254969A1 (de) * 2002-11-26 2004-06-03 Philips Intellectual Property & Standards Gmbh Hochdruckentladungslampe mit Quecksilberchlorid bei begrenztem Chlorgehalt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008145472A2 *

Also Published As

Publication number Publication date
JP2010528439A (ja) 2010-08-19
WO2008145472A2 (fr) 2008-12-04
CN101681790A (zh) 2010-03-24
DE202007007688U1 (de) 2008-07-10
WO2008145472A3 (fr) 2009-02-26
US20100176722A1 (en) 2010-07-15

Similar Documents

Publication Publication Date Title
EP0570772B1 (fr) Lampe à décharge à haute pression
EP0887841B1 (fr) Lampe à halogénure métallique avec enveloppe céramique
EP0602530A2 (fr) Procédé pour fabriquer un joint étanche au vide entre une partie céramique et une partie métallique, notamment pour des récipients et des lampes à décharge
DE2951966C2 (de) Hochdruck-Metalldampfentladungslampe
EP0536609A1 (fr) Lampe à décharge à haute pression
DE69403176T2 (de) Elektrische Lampe
EP0602529B1 (fr) Lampe de décharge à haute pression ayant un récipient céramique de décharge
EP2020018B1 (fr) Lampe à décharge à haute pression
DE4338377A1 (de) Metallhalogenidentladungslampe mit keramischem Entladungsgefäß und Herstellverfahren für eine derartige Lampe
EP0472100A2 (fr) Lampe à décharge à haute pression
EP0825636B1 (fr) Lampe à décharge haute pression
EP1730766B1 (fr) Systeme d'electrodes pour lampe a decharge gazeuse haute pression
DE10026802A1 (de) Metallhalogenidlampe mit keramischem Entladungsgefäß
EP2153457A2 (fr) Lampe à décharge haute pression
EP1351278B1 (fr) Lampe à halogénure métallique avec enveloppe céramique
EP1372184A2 (fr) Système d'électrodes pour une lampe aux halogénures métalliques et lampe équipée d'un tel système
EP1434252A2 (fr) Lampe à halogéne métallique avec enveloppe céramique, système d'électrodes pour une telle lampe et procédé pour fabriquer un tel système
WO2008074361A1 (fr) Électrode pour une lampe à décharge
EP0588201A2 (fr) Lampe à décharge haute pression et procédé pour la fabrication d'une lampe à décharge à haute pression
DE202004013922U1 (de) Metallhalogenidlampe mit keramischem Entladungsgefäß
DE3619068C2 (de) Kompakte Metallhalogenidentladungslampe
EP1709668B1 (fr) Lampe a decharge basse pression
DE10226762A1 (de) Elektrodensystem für eine Metallhalogenidlampe und zugehörige Lampe
DE29612757U1 (de) Einseitig verschlossene elektrische Glühlampe
EP2153456A1 (fr) Lampe à décharge à haute pression

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20090925

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

RIN1 Information on inventor provided before grant (corrected)

Inventor name: STOCKWALD, KLAUS

Inventor name: KAENING, MARKO

Inventor name: KLOSS, ANDREAS

Inventor name: HUETTINGER, ROLAND

17Q First examination report despatched

Effective date: 20120612

DAX Request for extension of the european patent (deleted)
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

18D Application deemed to be withdrawn

Effective date: 20121023