EP0271877A2 - Traversée pour lampes à sodium et à halogénures métalliques - Google Patents

Traversée pour lampes à sodium et à halogénures métalliques Download PDF

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Publication number
EP0271877A2
EP0271877A2 EP87118580A EP87118580A EP0271877A2 EP 0271877 A2 EP0271877 A2 EP 0271877A2 EP 87118580 A EP87118580 A EP 87118580A EP 87118580 A EP87118580 A EP 87118580A EP 0271877 A2 EP0271877 A2 EP 0271877A2
Authority
EP
European Patent Office
Prior art keywords
inlead
arc tube
discharge lamp
pressure discharge
aperture
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Withdrawn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
EP87118580A
Other languages
German (de)
English (en)
Other versions
EP0271877A3 (fr
Inventor
Edmund M. Passmore
George L. Duggan
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
GTE Products Corp
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 GTE Products Corp filed Critical GTE Products Corp
Publication of EP0271877A2 publication Critical patent/EP0271877A2/fr
Publication of EP0271877A3 publication Critical patent/EP0271877A3/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Withdrawn legal-status Critical Current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
    • H01J61/366—Seals for leading-in conductors

Definitions

  • the invention relates to arc tubes for high pressure discharge lamp applications. More particularly, the invention relates to improvements in ceramic arc tubes for high pressure sodium lamps and related lamps, such as mixed metal-vapor and metal-halide lamps. Even more particularly, the invention relates to an improved end seal for arc tubes used in the high-pressure discharge lamps.
  • An arc tube of a high pressure discharge lamp may have at each end thereof an electrical inlead to the tungsten electrode of the arc tube.
  • a niobium tube is sealed into the end of the arc tube with a refractory glass frit; the niobium tube functions as an electrical inlead to the tungsten electrode.
  • an alumina-tungsten cermet inlead may be used, as shown in the prior art drawing of Fig. 2 herein, or as described in United States Patent No. 4,155,757, to Hing, or United States Patent No. 4,155,758, to Evans et al. Also refer to co-pending application, Serial No.
  • the sealing glass is exposed to the arc tube constitutents.
  • the extent (or area) of such exposure may be relatively large if the sealing glass flows into the arc tube chamber and spreads over the internal surface of the arc tube.
  • Advances in glass frit formulations have been made to minimize the chemical reactions of the sealing glass with arc tube constituents during lamp operation.
  • United States Patent No. 4,208,605 to McVey et al.
  • a glass frit formulation of alumina-calcia-baria is taught.
  • strontium oxide in the sealing composition is described.
  • Refer also to United States Patent No. 4,316,939, to Hing teaching the use of alumina-silica-magnesia-boric oxide.
  • a known sealing composition is comprises of 22% alumina, 41% silica, and 47% yttria.
  • a serious problem with arc tube seals utilizing glass frits is that the temperature of the polycrystalline aluminium oxide (PCA) arc tube end is limited to an operating temperature of about 800° Celsius, which is below the capability of the PCA tube.
  • a PCA arc tube may be operated at temperatures up to 1200°C or even higher in the central region of the arc tube.
  • This temperature limitation applying to the end portions of the arc tube is largely due to the aggressive corrosion of the sealing glass by sodium, metal halides, and other fill constituents, including such metals as thalium, cadmium, and zinc, such corrosion occurring at higher temperatures.
  • Another object of the invention is to the provide an improved technique for sealing an arc tube of a high-pressure discharge lamp in a manner to prevent the glass sealing frit from flowing into the arc chamber.
  • Yet another object of the invention is to provide, in an arc tube of a high-pressure discharge lamp, a means for limiting the chemical reactions between the sealing joints and constituents of the fill of the arc tube.
  • Still another object of the invention is to provide, in an arc tube of a high-pressure discharge lamp, a means for protecting all or substantially all of the inlead from chemical reaction with the constituents of the fill of the arc tube.
  • a further object of the invention is to provide an improved seal for an arc tube of a high-pressure discharge lamp in which the sealing technique does not require costly close-tolerance technology and procedures.
  • a high-pressure lamp comprising an arc tube having at least one end thereof formed with an aperture and an inlead member adapted to be received by the arc tube at the aperture.
  • the inlead member supports electrode means.
  • a coiled wire is disposed about the inlead member forming a gasket between the inlead member and arc tube end aperture.
  • a sealing glass is provided for sealing between the inlead member and the arc tube end. The sealing glass is subject to reacting chemically with the constituents of the fill within the arc tube, when and if the sealing glass is exposed to the fill.
  • the coiled wire is positioned such that the sealing glass is shielded from the fill. The structure prevents a chemical reaction from occuring between the sealing glass and the constituent of the fill.
  • a disk is mounted on the end of the arc tube.
  • the disk has a second aperture for receiving the inlead member.
  • the disk is sealed to the arc tube end and inlead member by the sealing glass.
  • the coiled wire extends about the inlead member from a position at the arc tube aperture to a position covering substantially all of the inlead member located within the internal chamber of the arc tube. Further protection of the inlead member may be attained by coating it with a material, e.g., tungsten by sputtering or by chemical vapor deposition.
  • the coiled wire extends about the inlead member substantially at the aperture of the sealing disk.
  • the coiled wire extends about the inlead member at both the sealing disk aperture and the arc tube end aperture.
  • the arc tube end aperture is tapered to prevent the coiled wire from protruding into the interior of the arc tube.
  • the arc tube end aperture is provided with an internal annular channel for receiving the coiled wire and preventing the coiled wire from protruding into the interior of the arc tube.
  • the arc tube and the disk may be formed from polycrystalline alumina.
  • the inlead member may be an inlead tube, such as a niobium tube, supporting a tungsten electrode.
  • the coiled wire may be a helical coil of tungsten wire.
  • the coiled wire has a preferred wire diameter in a range on the order of 3.0 to 5.0 mils, for ease of construction.
  • the inlead member may be a cermet inlead and the coiled wire may be formed from a material selected from a group consisting of molybdenum, tantalum, niobium, tungsten, and rhenium.
  • FIGS. 1 and 2 show typical prior art constructions for sealing the end of an arc tube.
  • FIG. 1 illustrates the end portion of a ceramic arc tube 10, typically formed from polycrystalline alumina for a high-pressure sodium lamp.
  • Arc tube 10 includes end wall 12 having defined therein an end wall aperture 14.
  • An inlead member 16 is disposed in aperture 14 and extends from an external position at one end 16A an internal position within chamber 18 of arc tube 10.
  • Inlead member 16 may be in the form of a niobium tube which supports electrode wire 20 and electrode turns 22 within chamber 18.
  • cermet inlead 36 is maintained and sealed in position by glass sealing frit 38.
  • Cermet inlead 36 may have associated therewith an electrode and associated light-emitting material.
  • the cermet and electrode combination may be sealed by a sealing frit typically comprising silica, alumina, and yttria or magnesia.
  • glass sealing frit 38 in FIG. 2 extends about the inlead member 36 where it is exposed at 39 to constituents within the chamber of arc tube 30.
  • Cermets such as cermet 36, are electrically conductive; they are refractory composites, typically comprising an interconnected network of molybdenum or tungsten within a matrix of dense, polycrystalline aluminum oxide.
  • FIGS. 1 and 2 there is a substantially annular surface of glass frit at the sealing joint wherein inlead emerges from the end wall into the arc tube chamber.
  • This ring of frit is in contact with constituents of the fill of the arc tube.
  • This sealing joint frequently reacts chemically with the fill constituents during operation of the lamp leading to eventual loss of the hermetic seal and lamp failure.
  • FIG. 3 illustrating a first embodiment of the invention.
  • Means are provided, in the form of a helical coil tightly wound around the inlead member, to prevent reaction of the sealing glass with constituents of the light-emitting plasma within the arc chamber. Such reactions cause substantial deterioration of lamp performance and premature lamp failure.
  • the helical coil shields the glass sealing frit from exposure to the fill.
  • arc tube 40 having an end wall 42 with aperture 44 centrally disposed therein.
  • the inlead member which may be in the form of a niobium tube 46, is disposed in aperture 44.
  • Sealing disk 54 similarly has centrally disposed aperture 55 for receiving niobium tube 46.
  • Niobium tube 46 supports a tungsten electrode wire 50 and associated wire turns 52.
  • a glass sealing frit 56 is disposed between the inlead member 46, sealing disk 54, and end wall 42 of the arc tube.
  • FIG. 3 illustrates helical coil 60 would about the inlead member 46.
  • coil 60 is an open coil, meaning that there are spaces between turns.
  • Coil 60 forms a gasket preventing glass sealing frit 56 from flowing into the arc chamber 48. Accordingly, glass sealing frit 56 extends only to the edge of the left-most turn of coil 60, such as at location 57.
  • the diameter of niobium tube 46 may be approximately 0.125 inch while the diameters of aperture 44 and aperture 55 each may be approximately 0.130 inch.
  • the diameter of wire 60 should be equal to or slightly less than the space between inlead member 46 and aperture 44.
  • the diameter of the wire of the coil 60 may be 0.005 inches (5.0 mils) or slightly less. It is preferred that the diameter of the wire of helical coil 60 be in a range of approximately 3.0 to 5.0 mils.
  • a wire diameter substantially less than 3.0 mils is fragile for manufacturing assembly.
  • a wire diameter substantially greater than 5.0 mils may not provide sufficient flexibility for insertion of the inlead member and positioning in the arc tube end wall.
  • the wire coil is disposed about he inlead member; thereafter, the inlead member with the coil attached is inserted and centered within the arc tube aperture.
  • the sealing frit is then introduced along the sealing button (if used in a particular embodiment).
  • FIG. 4 shows an alternate embodiment of the invention.
  • the same reference characters are used to identify like parts of the arc tube previously referred to in FIG. 3.
  • an arc tube 40 having an end wall 42 and having associated therewith a sealing disk 54. Both the sealing disk 54 and the arc tube end wall 42 have centrally disposed apertures 44 and 55 for receiving niobium tube 46.
  • Niobium tube 46 in turn supports tungsten electrode wire 50 and associated turns 52.
  • FIG. 4 illustrates the use of a helical coil 60A, preferably of tungsten wire in the range of approximately 3.0 to 5.0 mils wire diameter.
  • the left-most end of helical coil 60A is disposed in aperture 44 such that a gasket is formed to prevent the glass sealing frit, such as at location 57, from extending into arc tube chamber 48.
  • the remainder of helical coil 60A extends to cover substantially the length of niobium tube 46 within chamber 48 to shield the niobium inlead tube from attack by the arc constituents.
  • the coil turns are closed, i.e., adjacent turns of the coil touch each other.
  • This is advantageous in the embodiment of FIG. 4 where protection of the niobium tube from chemical reaction with fill constituents is desired.
  • Further protection of the niobium tube can be achieved by coating the tube with tungsten, such as by sputtering or chemical vapor deposition directly on the tube. Such a coating may be used in the embodiment of FIG. 3 for providing protection to the niobium tube.
  • FIG. 5 illustrates an alternate embodiment of the invention employing arc tube 64 having end wall 66 with a centrally disposed aperture having an annular channel therein.
  • the aperture in end wall 66 is formed by two separate bores of respective diameters D1 and D2.
  • Diameter D1 is larger than diameter D2 providing a shoulder in the bore at location 68.
  • the helical tungsten coil 70 shown in cross section in the drawing, sits within the D1 bore against shoulder 68 and is wound about niobium tube 72, as illustrated in FIG. 5.
  • the bore in end wall 66 at diameter D2 may be but slightly larger, say, approximately .001 inches or less, than the outer diameter of the niobium tube so that there is only a slight clearance space between the niobium tube and the end wall.
  • Tungsten coil 70 provides a gasket for blocking sealing glass 74 and preventing sealing glass 74 form flowing into the arc tube chamber.
  • the embodiment of FIG. 5 includes alumina button 76. Sealing frit 74 extends into the channel defined by diameter D1 and extends to, but is blocked by, the left-most turn of helical coil 70.
  • FIGS. 6 and 7 Additional embodiments of the invention are described in FIGS. 6 and 7.
  • the same reference characters are used to identify parts previously identified in FIG. 4.
  • FIG. 6 there is shown arc tube 40 with end wall 42 having aperture 44 for receiving niobium tube 46.
  • Sealing disk 54 has centrally disposed aperture 55.
  • diameter D3 represents the inner diameter of aperture 44
  • dimension D4 represents the inner diameter of aperture 55.
  • Diameter D3 is smaller than diameter D4 so that a shoulder at 45 is formed.
  • Helical coil 80 shown in cross section in the drawing, is urged at one end against shoulder 45 and extends at the other end to the outside surface of sealing disk 54.
  • Coil 80 may be a closed coil as shown.
  • Coil 80 contacting shoulder 45, forms a gasket to prevent sealing frit 56 from extending into aperture 44 at end wall 42.
  • Frit 56 seals between end wall 42 and sealing disk 54, and frit 57 seals between sealing disk 54 and niobium tube 46.
  • FIG. 7 illustrates still a further embodiment of the invention also employing an arc tube 40, an end wall 42, an associated sealing disk 54, and glass sealing frit 56.
  • Niobium tube 46 extends through apertures in both end wall 42 and sealing disk 54.
  • Coil 82 shown in cross section in the drawing, extends the width of sealing disk 54 and further partially into the aperture in end wall 42.
  • the aperture in end wall 42 is tapered at 43 so as to limit the inner position of the coil 82 within the aperture of end wall 42.
  • Glass frit 56 provides a seal between end wall 42 and sealing disk 54.
  • Glass frit 57 provides a seal between the sealing disk 54 and niobium tube 46.
  • the aperture in sealing disk 54 may be of a diameter to leave sufficient clearance space between the aperture and coil 82 so that some of the glass sealing frit extends into the aperture in sealing disk 54.
  • the dimensions may be chosen so that there is a continuous glass sealing frit between locations 56 and 57. Because of the taper on the aperture at 43 in the end wall 42, the glass sealing frit will not extend beyond the right-most turn of coil 82. Thus, no sealing frit extends into the arc tube chamber.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
EP87118580A 1986-12-15 1987-12-15 Traversée pour lampes à sodium et à halogénures métalliques Withdrawn EP0271877A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US94144286A 1986-12-15 1986-12-15
US941442 1986-12-15

Publications (2)

Publication Number Publication Date
EP0271877A2 true EP0271877A2 (fr) 1988-06-22
EP0271877A3 EP0271877A3 (fr) 1990-07-04

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EP87118580A Withdrawn EP0271877A3 (fr) 1986-12-15 1987-12-15 Traversée pour lampes à sodium et à halogénures métalliques

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EP (1) EP0271877A3 (fr)
JP (1) JPS63160147A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0472100A2 (fr) * 1990-08-24 1992-02-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à haute pression
EP0573880A1 (fr) * 1992-06-10 1993-12-15 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge haute pression
EP0639853A1 (fr) * 1993-08-16 1995-02-22 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à haute pression avec récipient à décharge en céramique
EP0926700A2 (fr) * 1997-12-24 1999-06-30 Ngk Insulators, Ltd. Lampe à décharge haute pression
EP1006560A2 (fr) * 1998-12-04 2000-06-07 Toshiba Lighting & Technology Corporation Traversée pour lampe à décharge à haute pression, circuit et système d'illumination avec une telle lampe
US6169366B1 (en) 1997-12-24 2001-01-02 Ngk Insulators, Ltd. High pressure discharge lamp

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7615929B2 (en) * 2005-06-30 2009-11-10 General Electric Company Ceramic lamps and methods of making same
CN101980353B (zh) * 2010-10-14 2013-04-17 杨潮平 共烧封接高效陶瓷灯及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560903A (en) * 1982-02-26 1985-12-24 U.S. Philips Corporation High pressure discharge lamp
SU1224856A1 (ru) * 1984-09-26 1986-04-15 Предприятие П/Я А-3609 Электродный узел газоразр дной лампы

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560903A (en) * 1982-02-26 1985-12-24 U.S. Philips Corporation High pressure discharge lamp
SU1224856A1 (ru) * 1984-09-26 1986-04-15 Предприятие П/Я А-3609 Электродный узел газоразр дной лампы

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0472100A2 (fr) * 1990-08-24 1992-02-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à haute pression
EP0472100A3 (en) * 1990-08-24 1992-06-17 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh High-pressure discharge lamp
EP0573880A1 (fr) * 1992-06-10 1993-12-15 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge haute pression
US5446341A (en) * 1992-06-10 1995-08-29 Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh High-pressure electric discharge lamp with tight lead-through pin electrode connection and method of its manufacture
EP0639853A1 (fr) * 1993-08-16 1995-02-22 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à haute pression avec récipient à décharge en céramique
EP0926700A2 (fr) * 1997-12-24 1999-06-30 Ngk Insulators, Ltd. Lampe à décharge haute pression
EP0926700A3 (fr) * 1997-12-24 1999-12-08 Ngk Insulators, Ltd. Lampe à décharge haute pression
US6169366B1 (en) 1997-12-24 2001-01-02 Ngk Insulators, Ltd. High pressure discharge lamp
US6407504B1 (en) 1997-12-24 2002-06-18 Ngk Insulators, Ltd. High pressure discharge lamp having composite electrode
CN100361267C (zh) * 1997-12-24 2008-01-09 日本碍子株式会社 高压放电灯
EP1006560A2 (fr) * 1998-12-04 2000-06-07 Toshiba Lighting & Technology Corporation Traversée pour lampe à décharge à haute pression, circuit et système d'illumination avec une telle lampe
EP1006560A3 (fr) * 1998-12-04 2001-12-12 Toshiba Lighting & Technology Corporation Traversée pour lampe à décharge à haute pression, circuit et système d'illumination avec une telle lampe

Also Published As

Publication number Publication date
EP0271877A3 (fr) 1990-07-04
JPS63160147A (ja) 1988-07-02

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