EP1089321A1 - Tube d'arc en céramique - Google Patents

Tube d'arc en céramique Download PDF

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Publication number
EP1089321A1
EP1089321A1 EP00119008A EP00119008A EP1089321A1 EP 1089321 A1 EP1089321 A1 EP 1089321A1 EP 00119008 A EP00119008 A EP 00119008A EP 00119008 A EP00119008 A EP 00119008A EP 1089321 A1 EP1089321 A1 EP 1089321A1
Authority
EP
European Patent Office
Prior art keywords
arc tube
ceramic
sections
ceramic arc
lap joint
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Withdrawn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
EP00119008A
Other languages
German (de)
English (en)
Inventor
Jeffrey T. Neil
William H. Rhodes
Christopher A. Tarry
C. Scott Nordahl
Karlene Zuk
Rodrique Thibodeau
Gregory Zaslavsky
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 EP1089321A1 publication Critical patent/EP1089321A1/fr
Withdrawn legal-status Critical Current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
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H01J61/361—Seals between parts of vessel
    • 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
    • H01J61/361—Seals between parts of vessel
    • H01J61/365—Annular seals disposed between the ends of the vessel

Definitions

  • This invention relates to ceramic arc tubes for high intensity discharge lamps.
  • this invention relates to forming hermetic seals in ceramic arc tubes.
  • Ceramic arc tubes are used to contain the high temperature arcs of high intensity discharge (HID) lamps.
  • HID high intensity discharge
  • General examples of ceramic arc tubes for HID lighting applications are shown in U.S. Patent Nos. 4,387,067, 4,999,145, and 4,799,601 which are incorporated herein by reference.
  • these arc tubes were long cylindrical tubes, but recent lamp developments and the use of corrosive metal halide fill materials have dictated the use of more compact and complex shapes. For example, when a cylindrical geometry is used with a metal halide fill, the lamp fill tends to reside at the ends of the arc tube in the corner between the tube wall and the end button. During long term operation, these lamps are often characterized by corrosion of the ceramic in this area.
  • the lamp ultimately fails when the corrosion breaches the arc tube wall allowing the fill gas to leak.
  • Modifying the arc tube geometry to have hemispherical ends reduces the arc tube corrosion by eliminating the cold spot where the fill condenses. Not unexpectedly, the compact and complex arc tube shapes are more difficult to manufacture.
  • greater effort is required to keep the parts aligned and obtain hermetic seals.
  • Blow molding and gel casting can be used to form unitary arc tube bodies having the desired internal geometry but both methods have inherent disadvantages.
  • Blow molded lamps are limited by the degree of expansion achievable during blowing and are characterized by a thinning of the arc tube wall.
  • Gel casting is limited by the need to use a temporary core to define the cavity shape. The temporary core becomes entrapped inside the formed arc tube and must be removed. Typically, this is achieved by melting the core which is made of a low melting point material such as a wax. Because the core is destroyed by this process, gel casting tends to be a more expensive process. Additionally, the temporary core material can contaminate the arc tube cavity causing problems with lamp operation.
  • a ceramic arc tube comprising a hollow ceramic body having a wall, electrodes, male and female sections, and a cavity containing a fill material; the electrodes extending into the cavity through the wall and being connectable to an external source of electrical power; the male section being sealed hermetically to the female section by a lap joint; the lap joint having internal and external positioning interfaces and a sealing interface.
  • a ceramic arc tube assembly comprising male and female arc tube sections; each section being substantially hollow and having a wall and open and closed ends; the open ends having a sealing surface and internal and external positioning surfaces, the internal and external positioning surfaces being located at opposite ends of the sealing surface; the closed ends having an opening for receiving an electrode; the male and female sections when joined at the open ends forming a lap joint and enclosing a cavity.
  • the present invention uses a two piece arc tube design requiring only one hermetic joint.
  • the arc tube is made in two sections and joined using a lap joint. Because the arc tube body is made in two sections, each section can be produced by conventional ceramic forming techniques such as isostatic pressing, injection molding, slip casting, or gel casting. If gel casting is used, a temporary core is not needed to form the internal contours of the arc tube because each section has an accessible open end.
  • the lap joint is designed so that the two sections may be easily aligned and fitted together. Overlapping flanges are created on the open ends of each section. The flanges provide present surfaces for sealing and positioning the two sections. To maintain a tight seal, the sections may be designed with a slight interference fit. The amount of interference fit required to maintain a tight seal is typically 1 to 8%. Greater degrees of interference fit could be used but might lead to considerable distortion of the arc tube shape.
  • any organic binder in the green parts is removed.
  • the assembled sections are presintered to tack bond them together and remove residual organic material.
  • An alternative method of joining the two sections is to combine a temperature slightly above the softening or melting point of the organic binders used in the fabrication of the sections with a slight pressure to weld the two sections together prior to binder removal. In this manner, the degree of interference fit could be reduced or eliminated thereby reducing distortion of the sintered arc tube.
  • the final sealing of the two sections is achieved by sintering the arc tube usually in a hydrogen containing atmosphere. The temperatures, heating rate, cooling rate and soak period at peak temperature will vary depending on the ceramic composition.
  • Various arc tube and lap joint configurations are shown in Figs. 1-6.
  • Fig. 1 is a cross sectional view of an arc tube assembly having substantially hollow, cylindrical male 4 and female 2 sections. Each section has the same inside and outside diameters. At the closed end 11 of each section, there is an opening 12 in the wall 14 for inserting an electrode (not shown). Capillaries 30 are attached at the closed ends 11 to facilitate positioning and sealing of the electrode in the completed arc tube. At open ends 15 and 17, the sections have internal 10 and external 8 positioning surfaces and sealing surfaces 3 and 6. These surfaces conjoin to form the lap joint shown in Fig. 2. More particularly, flange 5 of male section 4 extends coaxially at the periphery of open end 17. The outside diameter of flange 5 is less than the outside diameter of the male section.
  • Sealing surface 3 is cylindrical and is formed by the outside diameter of flange 5.
  • flange 7 of female section 2 extends coaxially at the periphery of open end 15.
  • Flange 7 has an inside diameter which is greater than the inside diameter of female section 2 and equal to the outside diameter of flange 5.
  • Sealing surface 6 is cylindrical and is formed by the inside diameter of flange 7.
  • the recess formed at the open end 15 accepts flange 5 of the male section when the parts are mated to form the arc tube.
  • Positioning surfaces 8 and 10 are formed by the discontinuities in the diameters of each section 2 and 4 at their open ends. Positioning surfaces 8 and 10 ensure proper mating of the two sections. Preferably, positioning surfaces 8 and 10 are substantially orthogonal to the central axis of sections 2 and 4 however other configurations are possible.
  • sealing surfaces 3 and 6 are cylindrical and coaxial with the central axis of the two sections.
  • one or both of the sealing surfaces may be slightly tapered.
  • the outside diameter of flange 5 is made slightly larger than the inside diameter of flange 7 and sealing surface 3 of male section 4 is tapered inwardly.
  • Hermetic seals have been obtained using a 1% interference fit (0.004 inches) and a 2° taper on the male flange. Similar performance was observed when the interference fit cut in half to 0.002 inches.
  • the arc tube sections are made preferably from alumina which provides the necessary degree of translucency after sintering.
  • a preferred composition is a pure alumina containing about 500 ppm MgO.
  • the assembled sections are presintered in air at below 1350°C, and preferably at 1200°C for 1 hour. Final sintering is performed in a hydrogen containing atmosphere at a temperature from about 1820°C to 1950°C. More preferably, the arc tube parts are sintered in wet H 2 at 1935°C for 4 hours.
  • the sintered arc tubes of the present invention exhibit excellent dimensional control and reproducibility.
  • Fig. 2 is a cross sectional view of an assembled arc tube having the configuration shown in Fig. 1.
  • Male section 4 has been mated to female section 2 and sintered to form a hermetic seal at lap joint 25.
  • Lap joint 25 is composed of sealing interface 28 and positioning interfaces 22 and 24.
  • the sealing and positioning interfaces in the assembled arc tube are formed at the junction of the sealing and positioning surfaces shown in Fig. 1.
  • a hermetic seal is formed at the sealing interface 28 after final sintering.
  • the general placement of sealing interface 28 is midway through arc tube wall 14. However, the relative thickness of flanges 5 and 7 may be adjusted to effect the formation of the sealing interface at different depths in wall 14.
  • the width of sealing interface 28 be at least equal to half the thickness of the wall 14 in the region immediately adjacent to the lap joint.
  • Hermetic seals may also be formed at the positioning interfaces 22 and 24. However, depending on the lap joint configuration, gaps may form at the positioning interfaces after sintering. In this embodiment, these gaps may extend up to halfway through the arc tube wall but have not been shown to affect lamp performance. The interior gap can be eliminated by making the male flange 0.001 to 0.005 inches longer than the female flange.
  • Electrodes 20 are sealed hermetically into capillaries 30 by a glass frit.
  • the electrodes extend into cavity 32 and are connectable to an external source of electrical power such as a ballast.
  • the cavity 32 contains fill 35 and a fill gas (not shown).
  • the fill 32 may consist of any number of known arc tube fill materials and fill gases.
  • Fig. 3 and 4 are cross sectional views of an arc tube assembly and resultant arc tube similar to those shown in Figs. 1 and 2.
  • Flanges 5 and 7 are tapered with respect to central axis 49 to give sealing surfaces 40 and 43 and sealing interface 42 a frustoconical shape.
  • the taper angle formed by frustoconical sealing surfaces 40 and 43 and central axis 49 may varied from 5 to 20 degrees. The limit on the taper angle is the angle beyond which a good diffusion bond seal can be achieved. If the angle is too steep, the driving force for bonding using an interference seal would be reduced to a point where sections 2 and 4 would separate during sealing by sliding along the sealing interface 42 instead of joining.
  • the frustoconical shape can provide a wider sealing interface than the cylindrical shape and tends to reduce the formation and penetration of gaps at positioning interfaces 22 and 24. This is believed to increase the strength of the lap joint 47.
  • Fig. 5 and 6 illustrates an embodiment of the present invention in which the arc tube shape is not a right cylinder but still remains axially symmetric about central axis 49.
  • closed ends 11 have a rounded, hemispherical geometry.
  • the rounded contour reduces corrosion of the arc tube wall caused by the condensation of fill 35.
  • Lap joint 47 is the same as the lap joint shown in Figs. 3 and 4.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
EP00119008A 1999-09-29 2000-09-01 Tube d'arc en céramique Withdrawn EP1089321A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40881299A 1999-09-29 1999-09-29
US408812 1999-09-29

Publications (1)

Publication Number Publication Date
EP1089321A1 true EP1089321A1 (fr) 2001-04-04

Family

ID=23617874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00119008A Withdrawn EP1089321A1 (fr) 1999-09-29 2000-09-01 Tube d'arc en céramique

Country Status (4)

Country Link
EP (1) EP1089321A1 (fr)
JP (1) JP4709361B2 (fr)
CA (1) CA2316649A1 (fr)
HU (1) HUP0003776A3 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6724144B2 (en) 2000-03-21 2004-04-20 Japan Storage Battery Co., Ltd. Discharge lamp
DE102004001176A1 (de) * 2004-01-05 2005-08-04 Schott Ag Verwendungen von Glaskeramiken
WO2006054237A2 (fr) * 2004-11-19 2006-05-26 Koninklijke Philips Electronics N.V. Lampe a decharge haute pression
WO2007078574A1 (fr) * 2005-12-19 2007-07-12 General Electric Company Chambre à arc céramique aux extrémités conformées
DE102007006180A1 (de) 2007-02-07 2008-08-14 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zur Herstellung eines keramischen Entladungsgefäßes und zugehörige Hochdruckentladungslampe
WO2009139978A2 (fr) * 2008-05-15 2009-11-19 Osram Sylvania, Inc. Lampe à décharge en céramique avec brûleur et réflecteur intégrés
DE102008063620A1 (de) * 2008-12-18 2010-06-24 Osram Gesellschaft mit beschränkter Haftung Keramisches Entladungsgefäß für eine Hochdruckentladungslampe
CN101353263B (zh) * 2007-07-26 2010-09-29 余恺为 一体化陶瓷金卤灯电弧管壳凝胶粘结制造方法
EP2323156A3 (fr) * 2009-11-13 2011-06-01 NGK Insulators, Ltd. Tuyau en céramique pour lampe de décharge haute intensité et son procédé de production
WO2012113659A1 (fr) 2011-02-22 2012-08-30 Osram Ag Réceptacle à décharge en céramique, lampe apparentée et procédé de fabrication dudit réceptacle
US8398796B2 (en) 2007-11-20 2013-03-19 General Electric Company Green joining ceramics

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6798139B2 (en) * 2002-06-25 2004-09-28 General Electric Company Three electrode ceramic metal halide lamp
JP2011090001A (ja) * 2005-04-26 2011-05-06 Seiko Instruments Inc 近視野光発生素子の製造方法
JP4787557B2 (ja) * 2005-04-26 2011-10-05 セイコーインスツル株式会社 近視野光発生素子の製造方法
JP5798853B2 (ja) * 2006-01-16 2015-10-21 セイコーインスツル株式会社 近接場光発生素子の製造方法
KR101388838B1 (ko) * 2006-03-24 2014-04-23 엔지케이 인슐레이터 엘티디 소결체 제조 방법 및 소결체
KR100866502B1 (ko) * 2007-05-08 2008-11-03 주식회사 기노리 고압 방전등용 나선결합부를 갖는 세라믹튜브 및 그제조방법
CN103151238A (zh) * 2011-12-07 2013-06-12 宁波光令材料科技有限公司 陶瓷电弧灯管及其制造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7415840A (en) * 1974-12-05 1976-06-09 Philips Nv High pressure discharge tube for lamp with narrow ends - has mould with flexible polyurethane outer jacket and polycrystalline wall structure
US4387067A (en) * 1980-02-06 1983-06-07 Ngk Insulators, Ltd. Ceramic arc tube of metal vapor discharge lamps and a method of producing the same
EP0331154A1 (fr) * 1988-03-03 1989-09-06 Feldmühle Aktiengesellschaft Tube présentant un renflement pour lampes à décharge à vapeurs métalliques
JPH1064481A (ja) * 1996-08-20 1998-03-06 Kyocera Corp 放電灯用セラミック管及びその製造方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5280675A (en) * 1975-12-26 1977-07-06 Toshiba Corp Metal vapor discharge lamp
JPS6264046A (ja) * 1985-09-17 1987-03-20 Toshiba Corp セラミツク放電灯の製造方法
JPS6484564A (en) * 1987-09-25 1989-03-29 Kyoritsu Denki Kk Extra-high pressure discharge lamp
JP2869097B2 (ja) * 1989-09-28 1999-03-10 岩城硝子株式会社 多層膜反射鏡を有するランプ
JPH08273616A (ja) * 1995-03-31 1996-10-18 Toto Ltd 金属蒸気発光管の開口部の封止部構造
JPH10134768A (ja) * 1996-10-25 1998-05-22 Toto Ltd 放電灯
TW478006B (en) * 1999-12-23 2002-03-01 Gen Electric Single ended ceramic arc discharge lamp and method of making same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7415840A (en) * 1974-12-05 1976-06-09 Philips Nv High pressure discharge tube for lamp with narrow ends - has mould with flexible polyurethane outer jacket and polycrystalline wall structure
US4387067A (en) * 1980-02-06 1983-06-07 Ngk Insulators, Ltd. Ceramic arc tube of metal vapor discharge lamps and a method of producing the same
EP0331154A1 (fr) * 1988-03-03 1989-09-06 Feldmühle Aktiengesellschaft Tube présentant un renflement pour lampes à décharge à vapeurs métalliques
JPH1064481A (ja) * 1996-08-20 1998-03-06 Kyocera Corp 放電灯用セラミック管及びその製造方法

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6724144B2 (en) 2000-03-21 2004-04-20 Japan Storage Battery Co., Ltd. Discharge lamp
DE102004001176A1 (de) * 2004-01-05 2005-08-04 Schott Ag Verwendungen von Glaskeramiken
WO2006054237A2 (fr) * 2004-11-19 2006-05-26 Koninklijke Philips Electronics N.V. Lampe a decharge haute pression
WO2006054237A3 (fr) * 2004-11-19 2008-04-17 Koninkl Philips Electronics Nv Lampe a decharge haute pression
WO2007078574A1 (fr) * 2005-12-19 2007-07-12 General Electric Company Chambre à arc céramique aux extrémités conformées
DE102007006180A1 (de) 2007-02-07 2008-08-14 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zur Herstellung eines keramischen Entladungsgefäßes und zugehörige Hochdruckentladungslampe
WO2008095771A2 (fr) * 2007-02-07 2008-08-14 Osram Gesellschaft mit beschränkter Haftung Procédé de fabrication d'une cuve à décharge céramique et lampe à décharge haute pression correspondante
WO2008095771A3 (fr) * 2007-02-07 2008-11-13 Osram Gmbh Procédé de fabrication d'une cuve à décharge céramique et lampe à décharge haute pression correspondante
CN101353263B (zh) * 2007-07-26 2010-09-29 余恺为 一体化陶瓷金卤灯电弧管壳凝胶粘结制造方法
US8398796B2 (en) 2007-11-20 2013-03-19 General Electric Company Green joining ceramics
WO2009139978A2 (fr) * 2008-05-15 2009-11-19 Osram Sylvania, Inc. Lampe à décharge en céramique avec brûleur et réflecteur intégrés
WO2009139978A3 (fr) * 2008-05-15 2010-09-16 Osram Sylvania, Inc. Lampe à décharge en céramique avec brûleur et réflecteur intégrés
US8247972B2 (en) 2008-05-15 2012-08-21 Osram Sylvania Inc. Ceramic discharge lamp with integral burner and reflector
DE102008063620A1 (de) * 2008-12-18 2010-06-24 Osram Gesellschaft mit beschränkter Haftung Keramisches Entladungsgefäß für eine Hochdruckentladungslampe
EP2323156A3 (fr) * 2009-11-13 2011-06-01 NGK Insulators, Ltd. Tuyau en céramique pour lampe de décharge haute intensité et son procédé de production
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
CA2316649A1 (fr) 2001-03-29
JP4709361B2 (ja) 2011-06-22
HUP0003776A3 (en) 2002-12-28
JP2001118543A (ja) 2001-04-27
HUP0003776A2 (hu) 2002-01-28

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