EP0639853B1 - Lampe à décharge à haute pression avec récipient à décharge en céramique - Google Patents

Lampe à décharge à haute pression avec récipient à décharge en céramique Download PDF

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Publication number
EP0639853B1
EP0639853B1 EP94112142A EP94112142A EP0639853B1 EP 0639853 B1 EP0639853 B1 EP 0639853B1 EP 94112142 A EP94112142 A EP 94112142A EP 94112142 A EP94112142 A EP 94112142A EP 0639853 B1 EP0639853 B1 EP 0639853B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
discharge lamp
electrode
pressure discharge
ceramic
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
EP94112142A
Other languages
German (de)
English (en)
Other versions
EP0639853A1 (fr
Inventor
Ulrich Dr. Henger
Stefan Dr. Jüngst
Peter Wahrendorff
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 EP0639853A1 publication Critical patent/EP0639853A1/fr
Application granted granted Critical
Publication of EP0639853B1 publication Critical patent/EP0639853B1/fr
Anticipated expiration legal-status Critical
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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
    • 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
    • H01J61/10—Shields, screens, or guides for influencing the discharge
    • 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
    • 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
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • 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
    • 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
    • H01J61/34—Double-wall vessels or containers

Definitions

  • the invention relates to a high-pressure discharge lamp according to the Preamble of claim 1.
  • Such a lamp is known from EP-A 472 100. With this setup the bushing is made of niobium and inserted deep into the stopper. It has been shown that during the ignition of the lamp the discharge arc remains in the glow phase for a very long time. The cause is that the discharge arc first in the recess of the plug on the niobium bushing starts at the point where the glass solder or the melting ceramic ends. Due to the high load, metallic can occur at this point Sputtered niobium, which blackens the discharge vessel at an early stage leads. An additional disadvantage is that this mechanism can also affect the seal by damaging the glass solder becomes. The latter leads to the leakage of the discharge vessel and thus to shorten the lifespan.
  • JP-GM 49-14449 is a metal halide discharge lamp Ceramic discharge vessel in which a shield in the form a circular quartz glass plate directly behind the electrode and thus the attachment of the arc to the electrode shaft and as its Damage to the glass solder melt is prevented. However, fixing the plate is problematic.
  • GB-PS 1 240 253 is a high-pressure discharge lamp with a Discharge vessel made of quartz glass known. A sleeve made of quartz glass is over the electrode shaft is pushed around the quartz glass at the base of the assembly from electrode and lead-through against corrosion by sodium protect.
  • EP-A 264 764 describes a high-pressure discharge lamp with a discharge vessel known from ceramics. Carrying out of niobium by means of Glass solder is melted, consists of an external power supply and a sealing washer. The implementation and the glass solder are against Attacks on the filling components are protected by the electrode shaft is surrounded by a tube made of alumina ceramic.
  • a high-pressure sodium lamp is known from EP-A 523 782, in which the niobium is carried out using a glass solder in a ceramic stopper is sealed.
  • the electrode shaft is coming from the head of the electrode either partially or entirely with a metal spiral covered. This improves the ignition behavior of electrodes without an emitter.
  • the electrode shaft is surrounded by a sleeve, known per se, made of high-melting material as a shield.
  • the sleeve is fitted into a recess on the discharge side, in particular a blind hole or a bore, of the stopper and is thereby fixed.
  • the recess may also serve to hold the bushing, which consists of molybdenum or tungsten.
  • Ceramic (Al 2 O 3 ), but also quartz glass, hard glass or high-melting metal (eg tungsten) is particularly suitable as the material for the sleeve.
  • a sleeve made of metal can be formed in particular by a compact spiral, the turns of which touch.
  • the sleeve closes on the discharge side on the electrode head from.
  • This can be, for example, a helix or a ball.
  • the electrode head is widened compared to the electrode shaft, it forms a natural stop for the sleeve, which is thereby fixed.
  • the electrode shaft is then completely covered by the sleeve, so that the discharge arc cannot be attached to the shaft. It has it turned out, however, that this complete coverage of the discharge volume located shaft area is not absolutely necessary. According to the invention, a small gap can remain near the head.
  • the inner diameter of the sleeve is usually chosen so that it is approximately adapted to the diameter of the electrode shaft. However, he can can also be selected to be significantly larger than the shaft diameter. This is particularly advantageous if the electrode shaft does not dull implementation, but by means of a side extension piece. However, the inside diameter of the sleeve should advantageously be smaller than the transverse dimension of the electrode head to attach the arc to prevent reliably on the electrode shaft.
  • the diffuse discharge arc the first forms when the lamp is ignited, no further back than on Position the rear end of the electrode head (generally a coil). Thereby is achieved that the electrode tip is heated faster, so that again the discharge arc attaches faster to the tip of the electrode. In addition, the discharge arc retracts behind the Electrode head and premature blackening avoided. Finally there will also be related leaks in the lead-through area avoided.
  • additional improves the stability of the burning voltage and the light values by the melting point is set to the lowest possible temperature. The idea behind this is that glass solder is considerable at low temperatures reacts less with the halides of the lamp filling.
  • the ends of the discharge vessel are preferably closed with separate plugs. However, they can also have integral constrictions instead separate plug.
  • FIG. 1 schematically shows a known metal halide discharge lamp with an output of 150 W. It consists of a cylindrical outer bulb 1 made of quartz glass which defines a lamp axis and which is squeezed 2 and base 3 on two sides.
  • the axially arranged discharge vessel 4 made of Al 2 O 3 ceramic is bulged in the middle 5 and has cylindrical ends 6. However, it can also consist of a cylindrical tube, for example. It is held in the outer bulb 1 by means of two power leads 7, which are connected to the base parts 3 via foils 8.
  • the power supply lines 7 made of molybdenum are welded to bushings 9, which are each melted into a ceramic end plug 10 of the discharge vessel by means of glass solder 14.
  • the end plugs are also made of Al 2 O 3 .
  • the discharge vessel is filled with mercury and metal halide additives.
  • the first bushing 9a is arranged at the first end 6a, which serves as the pump end when the lamp is filled. It holds an electrode 11 in the interior of the discharge vessel, consisting of an electrode shaft 12 made of tungsten and an electrode head, which is formed by a coil 13 pushed onto the discharge end.
  • the electrode shaft 12 is closely surrounded by a ceramic sleeve 17.
  • the second bushing 9b is arranged at the second end 6b, which as Blind is created. Both bushings 9 consist of a solid Niobium pin, which is inserted into the bore of the end plug.
  • a filling hole 15 For example, for the purpose of evacuating and filling is near the Pumping end 6a attached a filling hole 15, which after filling through a glass solder or a melting ceramic 16 is closed.
  • a filling hole 15 Another It is possible to use the opening for a feedthrough as a filling hole and then insert and seal the bushing in this opening.
  • the niobium pin 9 with a diameter of 1.2 mm is in one ceramic plug 10 used with a length of 5 mm and has a length from 12 mm.
  • the electrode shaft is at its discharge end 12 butt welded from tungsten, the diameter of which is 0.5 mm and its length is 6.5 mm.
  • At its tip is a helix 13 an outer diameter of 1.1 mm, which consists of 9 turns.
  • the protrusion of the shaft at the tip 13 is 0.5 mm.
  • the Ceramic protective sleeve 17 is fixed between helix 13 and niobium pin 9. Their outer diameter is 1.1 mm, their inner diameter 0.6 mm.
  • the Overall length is 4 mm, of which a section (2 mm) in the bore of the Plug 10 is inserted deeply, while the niobium pin 9 over the rest 60% of the bore extends outwards.
  • the correct insertion depth of the Niobium stick is by a stop located on the outside of the plug, here a stop wire 18 made of niobium ensures.
  • the outside diameter of the plug is 3.3 mm and the diameter of the plug bore is 1.2 mm.
  • a capillary remains between the bore wall and the niobium stick or ceramic sleeve that with glass solder 14 over the entire length of the Bore is sealed.
  • the niobium pin 9 and the ceramic sleeve 17 are melted together as one unit.
  • the manufacture of the unit takes place by the electrode shaft 12 and the niobium pin 9 first be butt welded together. Then 12 the sleeve 17 is pushed, which either butts against the niobium pin 9 (Fig. 3a) or a short distance on a polished approach 19 of the niobium stick is postponed (Fig. 3b).
  • the outside diameter of the niobium stick and the sleeve are about the same size.
  • the sleeve is now pushed on the coil 13 (arrow) fixed.
  • the electrode system melts down wets the glass solder 14 the niobium stick 9 and also the sleeve 17, so that the sleeve is melted into the existing plug hole will (see Fig. 1).
  • the discharge vessel 4 'tapered ends 6' In a further non-claimed embodiment for 250 W (the is also suitable for smaller power levels) according to FIG. 4 the discharge vessel 4 'tapered ends 6'.
  • the plug 10 ' has an outer diameter of 5 mm and a length of 12 mm. The diameter the plug bore is 1.2 mm.
  • the plug 10 ' is at its discharge extended side so far that it is about 50% from the End 6 'of the discharge vessel protrudes.
  • a niobium stick 9 with a Diameter of 1.2 mm and a length of 12 mm is 3 mm deep in that outer end of the plug inserted.
  • An electrode shaft 12 is attached to it a length of 18 mm and a diameter of 0.6 mm butt-welded, which carries a spherical head 20 at its tip.
  • the niobium stick 9 is melted into the outermost end of the stopper by means of glass solder 14. In this case the temperature load is close to the Niobium pencils relatively low. It is about 150 to 200 degrees lower than in the first Embodiment. It is therefore not necessary to leave the whole remaining Annular gap of the bore 32 in the stopper area, as far as the sleeve therein is filled with glass solder.
  • the remaining annular gap in the hole is in operation of the lamp from the outer end to a certain one Place filled with filling condensate (halide sump).
  • FIG. 5 shows an exemplary embodiment according to the present invention.
  • the plug 21 (diameter 3.5 mm) made of ceramic or a Material consisting mainly of ceramics (e.g. a cermet)
  • a pen 22 directly from molybdenum or tungsten with a diameter of 0.3 mm sintered in.
  • the plug 21 has at its Discharge-facing surface a blind hole 28 with a diameter of 1.4 mm and a depth of 1 mm, in which a ceramic sleeve 29 of total 3.5 mm length is used, the electrode shaft 25 and one Part of the pin 22 surrounds loosely (distance about 100 microns).
  • the sleeve has one 1.4 mm outer diameter and 1 inner diameter mm. It does not sit directly on the helix, but is at a distance from it of a few tenths of a millimeter; it is through direct sintering held in blind hole 28. This is because of the similarity in thermal Expansion coefficients of sleeve and plug possible.
  • a non-claimed embodiment (Fig. 6) that largely The same reference numbers as in FIG. 5 are used for the same parts Stopper 21 no blind hole.
  • the sleeve 31 is between the flat, discharge side End face 30 of the plug and the coil 27 clamped. Your Length is reduced to 2.5 mm with otherwise unchanged dimensions.
  • the sleeve can also consist of quartz glass.
  • FIG. 7 Another embodiment not claimed (FIG. 7) is similar Fig. 6 constructed.
  • the spherical electrode 20 is at the shaft end with the Bushing pin 22 butt welded.
  • the sleeve 40 is made of a helix Tungsten wire, the individual turns of which are touching.
  • the implementation 22 is sintered directly into the plug 21.
  • the sleeve sits in a flat Well 41 of the stopper.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)

Claims (7)

  1. Lampe à décharge à haute pression, comportant une enceinte (4) de décharge en céramique, qui se trouve notamment dans une ampoule (1) extérieure, qui contient un volume de décharge ainsi qu'une atmosphère ionisable, notamment à halogénures métalliques, l'enceinte (4) de décharge comprenant deux extrémités (6) ayant des ouvertures, et deux électrodes (11), constituées d'une tige (12) et d'une tête (13;20), étant reliées à des entrées (7) de courant se trouvant à l'extérieur par l'intermédiaire de traversées (9) en forme de broches, et chacune des traversées étant fixée de manière étanche au vide dans une ouverture d'extrémité, les extrémités de l'enceinte de décharge étant fermées par des bouchons (10), et les traversées étant introduites dans des ouvertures des bouchons, une partie de la tige d'électrode étant entourée à l'intérieur du volume de décharge d'une douille (17;29) en matériau à haut point de fusion, caractérisée en ce que les traversées (9) sont en tungstène ou en molybdène et en ce que la douille (17;29) est introduite dans un renfoncement ménagé sur la surface (30) d'extrémité du bouchon située du côté de décharge, une partie prépondérante de la tige (12) d'électrodes étant, à partir du bouchon, recouverte par la douille, la douille (29) étant à distance de la tête de l'électrode.
  2. Lampe à décharge à haute pression suivant la revendication 1, caractérisée en ce que le diamètre intérieur de la douille est supérieur de plus de 200 µm au diamètre de la tige de l'électrode.
  3. Lampe à décharge à haute pression suivant la revendication 1, caractérisée en ce que la traversée est frittée directement dans les bouchons.
  4. Lampe à décharge à haute pression suivant la revendication 1, caractérisée en ce que la douille (17;29) est en céramique, en verre de quartz ou en métal à haut point de fusion.
  5. Lampe à décharge à haute pression suivant la revendication 1, caractérisée en ce que la douille entoure aussi une partie de la traversée.
  6. Lampe à décharge à haute pression suivant la revendication 1, caractérisé en ce que le diamètre intérieur de la douille est adapté au diamètre de la tige d'électrodes.
  7. Lampe à décharge à haute pression suivant la revendication 4, caractérisé en ce que la douille est formée par un filament (40) compact en métal à haut point de fusion.
EP94112142A 1993-08-16 1994-08-03 Lampe à décharge à haute pression avec récipient à décharge en céramique Expired - Lifetime EP0639853B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4327535 1993-08-16
DE4327535A DE4327535A1 (de) 1993-08-16 1993-08-16 Hochdruckentladungslampe mit keramischem Entladungsgefäß

Publications (2)

Publication Number Publication Date
EP0639853A1 EP0639853A1 (fr) 1995-02-22
EP0639853B1 true EP0639853B1 (fr) 1998-06-10

Family

ID=6495323

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94112142A Expired - Lifetime EP0639853B1 (fr) 1993-08-16 1994-08-03 Lampe à décharge à haute pression avec récipient à décharge en céramique

Country Status (4)

Country Link
EP (1) EP0639853B1 (fr)
JP (1) JPH0794142A (fr)
DE (2) DE4327535A1 (fr)
HU (1) HU214798B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8018156B2 (en) 2006-02-22 2011-09-13 Osram Ag High-pressure discharge lamp having a ceramic discharge vessel

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3264189B2 (ja) * 1996-10-03 2002-03-11 松下電器産業株式会社 高圧金属蒸気放電ランプ
DE19727430A1 (de) * 1997-06-27 1999-01-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Metallhalogenidlampe mit keramischem Entladungsgefäß
DE19757152C2 (de) 1997-12-20 2002-10-31 Thomas Eggers Elektrode für Entladungslampen
US6646379B1 (en) 1998-12-25 2003-11-11 Matsushita Electric Industrial Co., Ltd. Metal vapor discharge lamp having cermet lead-in with improved luminous efficiency and flux rise time
JP3233355B2 (ja) * 1999-05-25 2001-11-26 松下電器産業株式会社 メタルハライドランプ
JP3177230B2 (ja) 1999-05-25 2001-06-18 松下電子工業株式会社 金属蒸気放電ランプ
US6856079B1 (en) * 2003-09-30 2005-02-15 Matsushita Electric Industrial Co., Ltd. Ceramic discharge lamp arc tube seal
US20070138931A1 (en) * 2005-12-19 2007-06-21 General Electric Company Backwound electrode coil for electric arc tube of ceramic metal halide lamp and method of manufacture
ATE506689T1 (de) 2006-12-20 2011-05-15 Koninkl Philips Electronics Nv Keramischer brenner für eine keramische metallhalogenidlampe
DE102009047753A1 (de) * 2009-12-09 2011-06-16 Osram Gesellschaft mit beschränkter Haftung Entladungsgefäß aus Keramik für eine Hochdruckentladungslampe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523782A2 (fr) * 1991-07-12 1993-01-20 Koninklijke Philips Electronics N.V. Lampe à décharge dans la vapeur de sodium à haute pression

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240253A (en) * 1969-02-17 1971-07-21 Gen Electric Co Ltd Improvements in or relating to electric discharge lamps
US3821587A (en) * 1973-03-08 1974-06-28 Westinghouse Electric Corp Ceramic discharge lamp operable in air without an outer glass envelope
DE2732060C2 (de) * 1976-07-19 1986-06-12 Thorn Emi Ltd., London Elektrische Leuchtstofflampe
DE3636110A1 (de) * 1986-10-23 1988-04-28 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Einschmelzung fuer eine hochdruckentladungslampe
JPS63160147A (ja) * 1986-12-15 1988-07-02 ジー・ティー・イー・プロダクツ・コーポレイション ナトリウム及びメタル−ハライドランプ用の改良されたインリード

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523782A2 (fr) * 1991-07-12 1993-01-20 Koninklijke Philips Electronics N.V. Lampe à décharge dans la vapeur de sodium à haute pression

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8018156B2 (en) 2006-02-22 2011-09-13 Osram Ag High-pressure discharge lamp having a ceramic discharge vessel

Also Published As

Publication number Publication date
JPH0794142A (ja) 1995-04-07
HUT68196A (en) 1995-05-29
HU214798B (hu) 1998-05-28
HU9401480D0 (en) 1994-08-29
DE4327535A1 (de) 1995-02-23
EP0639853A1 (fr) 1995-02-22
DE59406182D1 (de) 1998-07-16

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