EP1006552A1 - Procédé de fabrication d'un tube d'arc en céramique pour lampes à halogénures métalliques - Google Patents

Procédé de fabrication d'un tube d'arc en céramique pour lampes à halogénures métalliques Download PDF

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Publication number
EP1006552A1
EP1006552A1 EP99123779A EP99123779A EP1006552A1 EP 1006552 A1 EP1006552 A1 EP 1006552A1 EP 99123779 A EP99123779 A EP 99123779A EP 99123779 A EP99123779 A EP 99123779A EP 1006552 A1 EP1006552 A1 EP 1006552A1
Authority
EP
European Patent Office
Prior art keywords
end cap
hollow body
assembly
open end
diameter
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Withdrawn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
EP99123779A
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German (de)
English (en)
Inventor
Jeffrey T. Neil
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 Sylvania Inc
Original Assignee
Osram Sylvania Inc
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 Sylvania Inc filed Critical Osram Sylvania Inc
Publication of EP1006552A1 publication Critical patent/EP1006552A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
    • H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-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
    • H01J61/30—Vessels; Containers

Definitions

  • This invention relates to a method of making ceramic arc tubes and more particularly to a method of making such arc tubes for use as metal halide lamps.
  • Ceramic arc tubes of materials such as polycrystalline alumina with one or more additives to control grain size have been used as the discharge vessel or arc tube for high-pressure sodium lamps. Recently, such arc tubes have been employed with metal halide lamps. See, for example, U.S. Patent No. 5,424,609. Such arc tubes have comprised 5 piece structures including a cylindrical body, a pair of end closures or buttons, and a pair of electrode receiving rods or capillary tubes sealed to the buttons. Manufacture of such arc tubes required extrusion or pressing of the individual components, as well as multiple assembly and heat treatment steps that increased handling and, therefore, cost.
  • U.S. Patent No. 4,766,347 there is shown an arc tube having only a ceramic body with electrode receiving rods sealed directly therein.
  • U.S. Patent No. 5,426,343 discloses a three-piece structure wherein a sealing button has an extending electrode rod receiving member integral therewith.
  • a method of making a ceramic arc tube for a metal halide lamp which comprises the steps of forming as an integral unit a hollow body having one open end and a substantially closed end.
  • the substantially closed end includes an outwardly extending capillary tube having an electrode-receiving aperture therein that communicates with the hollow body.
  • An end cap is then formed for closing the open end.
  • the end cap comprises an annular portion and an extending capillary tube.
  • the end cap annular portion has a diameter slightly larger than the diameter of the open and is fitted into the open end of the hollow body before firing, utilizing the elastic properties of the organic binders still contained in the components to allow the end portion to fit into the smaller open end.
  • This structure forms a pre-assembly.
  • the pre-assembly is then fired to remove the organic binders and to seal the end cap to the hollow body to form an assembly and the assembly is subsequently fired to sinter the same. Firing is generally continued until the body reaches a state of high translucency.
  • the outside diameter of the annular portion of the end cap will be greater than the inside diameter of the open end of the hollow body.
  • a method of making a ceramic arc tube for a metal halide lamp which comprises the steps of injection molding as an integral unit a hollow body having an open end and a substantially closed end.
  • the substantially closed end has an outwardly extending capillary tube having an electrode receiving aperture therein which communicates with the interior of the hollow body.
  • An end cap is injection molded for closing the open end.
  • the end cap includes an annular portion and an extending capillary tube.
  • the annular portion has the same diameter as the inside diameter of the open end of the hollow body.
  • the end cap is fitted into the open end of the hollow body before firing and joined at a temperature above the softening point of the thermoplastic injection molding binder, with some pressure applied to bond the open end to the end cap.
  • the assembly is then fired to remove organic binders and subsequently fired to sinter the same to a highly translucent state.
  • Fig. 1 an arc tube body 10 comprised of a first element 12 having a hollow body 14 with an open end 16 and a substantially closed end 18.
  • the end 18 includes an outwardly extending capillary tube 20 having an aperture 22 therethrough.
  • the transition from substantially closed end 18 to the capillary tube 20 includes a radius or chamfer 32.
  • An end cap 24 (see Fig 2) comprises an annular portion 26 and an outwardly extending capillary tube 28 with an aperture 30 therethrough.
  • the end cap also has a radius or chamfer 34 joining the annular portion 26 to the capillary 28.
  • the hollow body 14 and end cap 24 are preferably formed from polycrystalline alumina containing minor amounts of magnesia and, in some instances, yttria and zirconia Such a material is shown in U.S. Patent No. 5,682,082. Other minor constituents can also be included, as is known in the art.
  • body 14 and end cap 24 are made by injection molding or gel casting and utilize Baikowski grade CR-6 alumina powder containing 0.05 weight percent magnesia.
  • the hollow body 14 is heated to remove binder material and impart handling strength. Such heating is at 1200°C for 120 minutes in an air atmosphere.
  • the end cap 24 also is heated to remove binder material and cause the annular portion to shrink so that it will fit into open end 16. Such heating is at 1325°C for 120 minutes.
  • end cap 24 is inserted into open end 16 to form a pre-assembly that is then fired at 1325°C for 120 minutes in an air atmosphere to form the completed assembly. This firing shrinks the open end 16 and seals the unit together.
  • the assembly can be fired either horizontally or vertically for the final sintering operation, which occurs at temperatures above 1800°C in a hydrogen-containing atmosphere.
  • the firing temperature is 1880°C for 180 minutes and the atmosphere contains 100 % hydrogen.
  • the sintered arc tube would have an overall length of 34.7 mm; the "open" end 36 (Fig. 3) an outside diameter of 6.8 mm; the closed end 38 (Fig. 3) an outside diameter of 6.42 mm; a wall thickness for body 14 of 0.8 mm; a capillary tube outside diameter of 2.10 mm and an aperture diameter of 0.65 mm.
  • the thickness of the annular portion 26 of end cap 24, and the wall thickness of the closed end 18, is 1.95 mm.
  • the radii (or chamfers) 32 and 34 are between 0.2 and 1.0 mm and are preferably 0.5 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP99123779A 1998-11-30 1999-11-30 Procédé de fabrication d'un tube d'arc en céramique pour lampes à halogénures métalliques Withdrawn EP1006552A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US203190 1994-02-28
US20319098A 1998-11-30 1998-11-30

Publications (1)

Publication Number Publication Date
EP1006552A1 true EP1006552A1 (fr) 2000-06-07

Family

ID=22752890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99123779A Withdrawn EP1006552A1 (fr) 1998-11-30 1999-11-30 Procédé de fabrication d'un tube d'arc en céramique pour lampes à halogénures métalliques

Country Status (3)

Country Link
EP (1) EP1006552A1 (fr)
JP (1) JP2000277013A (fr)
CN (1) CN1255724A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1182681A1 (fr) * 2000-08-23 2002-02-27 General Electric Company Tube à arc pour lampe à halogénure métallique fait de céramique moulée par injection et présentant une extrémité non oblique; procédé de fabrication de ce tube
WO2002071442A1 (fr) * 2000-11-06 2002-09-12 General Electric Company Chambre a decharge en ceramique destinee a une lampe a decharge et procedes de fabrication associes
WO2002085590A1 (fr) * 2001-04-17 2002-10-31 Ngk Insulators, Ltd. Procede de fabrication d'un corps moule, pate de moulage, noyau de moulage, procede de fabrication de ce noyau de moulage, corps creux moule en ceramique, et recipient luminescent
EP1376657A2 (fr) * 2002-06-25 2004-01-02 General Electric Company Lampe céramique à halogénure métallique à trois électrodes
US6679961B2 (en) * 1999-12-30 2004-01-20 General Electric Company Die pressing arctube bodies
US6731066B2 (en) 2001-02-23 2004-05-04 Osram Sylvania Inc. Ceramic arc tube assembly
WO2006098956A1 (fr) * 2005-03-09 2006-09-21 General Electric Company Tubes à décharge
WO2012113659A1 (fr) 2011-02-22 2012-08-30 Osram Ag Réceptacle à décharge en céramique, lampe apparentée et procédé de fabrication dudit réceptacle
US8420932B2 (en) 2009-11-13 2013-04-16 Ngk Insulators, Ltd. Ceramic tube for high-intensity discharge lamp and method of producing the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7498742B2 (en) * 2002-11-25 2009-03-03 Koninklijke Philips Electronics N.V. High-pressure discharge lamp, and method of manufacture thereof
CN101276715B (zh) * 2008-01-29 2010-04-07 王凯 一种无排气管电弧管的制作工艺

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0074188A2 (fr) * 1981-09-04 1983-03-16 THORN EMI plc Lampe à décharge à haute pression
EP0175502A2 (fr) * 1984-08-31 1986-03-26 Ngk Insulators, Ltd. Tube à décharge pour une lampe à décharge à capteur métallique à haute pression et sa méthode de fabrication
EP0188229A2 (fr) * 1985-01-14 1986-07-23 General Electric Company Fermeture d'extrémité en céramique pour lampe et structure pour entrée de courant
EP0331154A1 (fr) * 1988-03-03 1989-09-06 Feldmühle Aktiengesellschaft Tube présentant un renflement pour lampes à décharge à vapeurs métalliques
WO1994006727A1 (fr) * 1992-09-16 1994-03-31 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elements d'etancheite pour tubes a regime d'arc en alumine et procede pour leur fabrication
EP0827177A2 (fr) * 1996-08-30 1998-03-04 Ngk Insulators, Ltd. Procédé de fabrication de tubes céramiques pour lampes à halogénures métalliques

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0074188A2 (fr) * 1981-09-04 1983-03-16 THORN EMI plc Lampe à décharge à haute pression
EP0175502A2 (fr) * 1984-08-31 1986-03-26 Ngk Insulators, Ltd. Tube à décharge pour une lampe à décharge à capteur métallique à haute pression et sa méthode de fabrication
EP0188229A2 (fr) * 1985-01-14 1986-07-23 General Electric Company Fermeture d'extrémité en céramique pour lampe et structure pour entrée de courant
EP0331154A1 (fr) * 1988-03-03 1989-09-06 Feldmühle Aktiengesellschaft Tube présentant un renflement pour lampes à décharge à vapeurs métalliques
WO1994006727A1 (fr) * 1992-09-16 1994-03-31 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elements d'etancheite pour tubes a regime d'arc en alumine et procede pour leur fabrication
EP0827177A2 (fr) * 1996-08-30 1998-03-04 Ngk Insulators, Ltd. Procédé de fabrication de tubes céramiques pour lampes à halogénures métalliques

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6679961B2 (en) * 1999-12-30 2004-01-20 General Electric Company Die pressing arctube bodies
JP2002117807A (ja) * 2000-08-23 2002-04-19 General Electric Co <Ge> 非テーパ端部を有する射出成形セラミック製メタルハライド発光管及びその製造方法
EP1182681A1 (fr) * 2000-08-23 2002-02-27 General Electric Company Tube à arc pour lampe à halogénure métallique fait de céramique moulée par injection et présentant une extrémité non oblique; procédé de fabrication de ce tube
WO2002071442A1 (fr) * 2000-11-06 2002-09-12 General Electric Company Chambre a decharge en ceramique destinee a une lampe a decharge et procedes de fabrication associes
US6731066B2 (en) 2001-02-23 2004-05-04 Osram Sylvania Inc. Ceramic arc tube assembly
US6979421B2 (en) * 2001-02-23 2005-12-27 Osram Sylvania Inc. Method of making a ceramic arc tube
US7407145B2 (en) 2001-04-17 2008-08-05 Ngk Insulators, Ltd. Core for molding hollow ceramic molded body and light emitting container
WO2002085590A1 (fr) * 2001-04-17 2002-10-31 Ngk Insulators, Ltd. Procede de fabrication d'un corps moule, pate de moulage, noyau de moulage, procede de fabrication de ce noyau de moulage, corps creux moule en ceramique, et recipient luminescent
US6953503B2 (en) 2001-04-17 2005-10-11 Ngk Insulators, Ltd. Method of manufacturing molded body, slurry for molding, core for molding, method of manufacturing core for molding, hollow ceramic molded body, and light emitting container
EP1376657A2 (fr) * 2002-06-25 2004-01-02 General Electric Company Lampe céramique à halogénure métallique à trois électrodes
EP1376657A3 (fr) * 2002-06-25 2006-10-18 General Electric Company Lampe céramique à halogénure métallique à trois électrodes
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
WO2006098956A1 (fr) * 2005-03-09 2006-09-21 General Electric Company Tubes à décharge
US8420932B2 (en) 2009-11-13 2013-04-16 Ngk Insulators, Ltd. Ceramic tube for high-intensity discharge lamp and method of producing the same
WO2012113659A1 (fr) 2011-02-22 2012-08-30 Osram Ag Réceptacle à décharge en céramique, lampe apparentée et procédé de fabrication dudit réceptacle
DE112012000355T5 (de) 2011-02-22 2013-10-17 Osram Gmbh Keramisches Entladungsgefäß und entsprechende Lampe und Verfahren zur Herstellung eines solchen Gefäßes
US9218950B2 (en) 2011-02-22 2015-12-22 Osram Gmbh Ceramic discharge vessel and related lamp and method of manufacturing such a vessel

Also Published As

Publication number Publication date
JP2000277013A (ja) 2000-10-06
CN1255724A (zh) 2000-06-07

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