EP1958239A2 - Lampe a decharge haute pression comprenant une enceinte de decharge ceramique - Google Patents

Lampe a decharge haute pression comprenant une enceinte de decharge ceramique

Info

Publication number
EP1958239A2
EP1958239A2 EP06841274A EP06841274A EP1958239A2 EP 1958239 A2 EP1958239 A2 EP 1958239A2 EP 06841274 A EP06841274 A EP 06841274A EP 06841274 A EP06841274 A EP 06841274A EP 1958239 A2 EP1958239 A2 EP 1958239A2
Authority
EP
European Patent Office
Prior art keywords
plug
discharge lamp
discharge vessel
pressure discharge
stopper
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Withdrawn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
EP06841274A
Other languages
German (de)
English (en)
Inventor
Dieter Trypke
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 EP1958239A2 publication Critical patent/EP1958239A2/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Withdrawn legal-status Critical Current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
    • H01J61/361—Seals between parts of vessel
    • H01J61/363—End-disc seals or plug seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/32—Seals for leading-in conductors
    • H01J5/40—End-disc seals, e.g. flat header

Definitions

  • the invention is based on a high-pressure discharge lamp with a ceramic discharge vessel according to the preamble of claim 1. It is in particular metal halide lamps, in particular for general lighting, or else high-pressure sodium lamps.
  • the sealing area should be vacuum-tight and resistant to high temperatures and not susceptible to corrosion.
  • This object is achieved by the characterizing features of claim 1.
  • Particularly advantageous Ausgestaltun ⁇ gen can be found in the dependent claims.
  • the stopper consists in one piece of at least one end of the discharge vessel from a molybdenum-vanadium alloy (MoV), the vanadium content being below 50% by weight.
  • MoV molybdenum-vanadium alloy
  • the plug tion a weldability with the imple ⁇ is possible in a simple manner.
  • an electrical conductivity of this layer of at least 5 m ⁇ is required.
  • the advantage of this one-piece plug is that it can be kept very short, which makes it easier to miniaturize the lamp.
  • a proportion of the vanadium in the range from 20 to 40% by weight is preferred, since the relative expansion differences can then be kept sufficiently small.
  • the ceramic discharge vessel has che tubular end regions ⁇ in which the plug is fitted.
  • the stopper sits in the end area through direct sintering.
  • the bushing is connected to this stopper in a vacuum-tight manner by welding, in particular by laser welding.
  • the advantage of sealing the discharge vessel by welding lies in the high corrosion resistance, high temperature resistance and high strength of such a weld.
  • a pin or tube that is electrically conductive can be used as a feedthrough.
  • the material of the implementing ⁇ tion should, at least as regards the efficient thermal Ausdehnungsko- be as well as possible into the special ⁇ on its composition adjusted to the stopper. Ideally, it agrees with it, but deviate ⁇ tions are possible.
  • the stopper is connected to the end of the discharge vessel without glass solder. In general, this is done by direct sintering. The implementation by means of direct sintering is also connected to the stopper.
  • a decisive advantage of the present invention is that, with a suitable choice of the relative proportion of vanadium in the stopper, there are no significant thermal expansion differences.
  • the seal is permanently ⁇ DERS particular, because a strong and durable connection is achieved by welding, which in this Hin ⁇ view of the art of the fuel sintering or smelting superior to Ü.
  • small expansion differences result in implementation of pure metals such as molybdenum and tungsten and highly enriched with metal cermet not so quick to tears, as tensions by Elas ⁇ ticity of the metal are more easily degraded.
  • the leadthrough can be a pin made of high-temperature-resistant metal, in particular tungsten or molybdenum, or a cermet which consists of a mixture of aluminum oxide and tungsten or molybdenum.
  • the bushing is a tube made of high-temperature-resistant metal.
  • This shape is particularly advantageous for high-watt lamps (typically 250 to 400 W).
  • the use of a tube as a lead-through has the advantage that even larger bores in the stopper, which are necessary for leading through large electrodes for high-watt lamps, can be sealed without excessive heat losses for the electrode.
  • this opening can be selected independently of the electrode size. In this case the Opening can be closed subsequently with a filling pin, said filling pin, tube and cermet welded in a step ⁇ ver.
  • a separate filling hole in the stopper as was often necessary in the past, can therefore be pulled completely out of the way.
  • the present invention is a high-pressure discharge lamp with a ceramic discharge vessel (made of aluminum oxide), which is usually surrounded by an outer bulb.
  • the discharge vessel has two ends which are closed with sealing means. These are usually one or more ⁇ -part plug. At least at one end of the discharge vessel ⁇ described construction is realized.
  • An electrically conductive bushing is passed through a central bore of the stopper in a vacuum-tight manner, to which an electrode with a shaft is attached, which projects into the interior of the discharge vessel.
  • the feedthrough is a component made of a metal or a cermet, the metal content of which is so high that it can be welded like a metal, the feedthrough being fastened in the stopper by means of a welded connection, that is to say without a glass solder.
  • the stopper itself is attached to the discharge vessel without glass solder. This happens üb ⁇ SHORT- by direct sintering.
  • the feedthrough is a pin made of electrically conductive cermet, the shaft of the electrode being butt-welded to the end face of the pin. The pin itself is welded to the plug. The advantage of this arrangement is that the thermal expansion difference between the pin and the plug is relatively small.
  • cermet is not as good a heat conductor as metal.
  • the bushing is advantageously inserted into the plug so that contact with the filling is minimized and the temperature load is reduced.
  • the bushing is an electrically conductive pin made of metal.
  • the pin itself can serve as an electrode shaft or be connected to it. It can also protrude beyond the plug to facilitate the connection to the external power supply.
  • This lead-through pin is preferably made of tungsten or molybdenum. They can be coated with rhenium.
  • the invention ultimately leads to capillary-free ceramic metal halide lamps.
  • the function of the capillaries is to guide the sealing point, usually by means of glass solder, into an uncritical temperature range.
  • Non-critical temperature range here means that the different coefficients of linear expansion of the materials in the melting zone do not lead to crack formation in the ceramic.
  • the temperature of the glass solder in the melting zone must be kept so low that no reactions with the filling will occur or the glass solder will become viscous again.
  • An electrode system is led through the capillary into the discharge vessel.
  • Parts of the electrode system previously these are Mo and Nb components, are used for the current passage .
  • the inside diameter of the capillary and the outside diameter of the electrode system must be selected so that the diameters cannot overlap, ie the assemblies are machine-compatible.
  • there is always a free space in the capillary the so-called dead volume. Since the capillary, Menden because of remo ⁇ temperature on the capillary as a cold trap part of the filling settles in this dead volume (sometimes irreversible). This results in color tempera ⁇ turstreuonne at any time of the burning time. Corrective measures, such as increasing the filling quantity, are only possible to a limited extent without triggering other early failure mechanisms.
  • a plug according to the present invention which is preferably carried out by means of a laser sersch singung, lasts only a few milliseconds ⁇ customer. Heating up the entire discharge vessel, as has been done up to now, is avoided by the short laser pulse time.
  • the lamp length can be reduced by the invention, ie compact lamps are more likely to be realized.
  • the invention saves the electrode system and lamp manufacture expensive materials, such as Nb (Zr) and reduces the vertical range of manufacture in the electrode system and burner manufacture. There is a synergy effect with regard to the design and the shutter speed with regard to discharge vessels for high pressure sodium lamps.
  • Discharge vessel in various exemplary embodiments
  • Figure 5 shows a high pressure sodium lamp with ceramic
  • Discharge vessel partly in section.
  • a metal halide lamp with an output of 150 W is shown schematically in FIG.
  • Composed of egg ⁇ nem defines a lamp axis cylindrical outer bulb 1 of quartz glass, which is crimped on two sides (2) and ended (3).
  • the axially arranged discharge vessel 4 made of Al 2 O 3 ceramic is bulged in the middle and has two cylindrical ends 6. It is held in the outer bulb 1 by means of two current leads 7, which are connected to the base parts 3 via foils 8.
  • the power supply lines 7 are welded to bushings 9, which are each fitted in a stopper 11 at the end 6 of the discharge vessel.
  • the bushings 9 are pins made of cermet or molybdenum with a diameter of approx. 1 mm.
  • the cermet is capable of routing ⁇ and weldable and consists of about 50 Vol .-% Wolf ⁇ ram (or molybdenum), balance alumina.
  • Both bushings 9 protrude from the outside of the stopper 11 and hold electrodes 14 on the discharge side, consisting of an electrode shaft 15 made of tungsten and a helix 16 pushed on at the discharge end .
  • the filling of the discharge vessel consists of mercury and additions of metal halides.
  • the end plugs 11 consist of a Mo-V alloy, the proportion of vanadium being between 10 and 50% by weight.
  • the proportion of vanadium is preferably 20 to 40% by weight. This makes them particularly well suited for welding to bushings, especially with pure Mo pins.
  • the plug 11 consists of MoV and is partially inserted in the cylindrical end 6 of the discharge vessel.
  • the stopper is sintered directly into the end 6, i.e. without glass solder.
  • Dir ⁇ sintering the discharge vessel is initially still in the green state when the plug is inserted into the end of shrinks during final sintering of the plug.
  • Typical sintering temperatures are from 1500 to 2000 ° C. This technique is known per se, see EP-A 887 839.
  • the shrinkage is in the order of magnitude of several up to 20 percent.
  • the stopper can be a cermet made of Mo, V and Al2O3, which is electrically conductive and can be welded.
  • the stopper can also consist of a MoV alloy, which is weldable anyway.
  • the plug 11 is connected on its outer surface to the bushing 9 by laser welding. The welding points are denoted by 12.
  • the stop consists ⁇ fen 11 from about 25 wt .-% vanadium and the balance molybdenum.
  • the implementation at the ends 6 of the discharge vessel is realized by a molybdenum tube 30 which is welded into a plug made of MoV 31 at the outer end (19).
  • the molybdenum tube 30 holds the electrode 32 by means of a crimp 33.
  • the lead-through tube 35 made of molybdenum can also have a continuous cylindrical shape.
  • the electrode 32 is fastened eccentrically with a wide head 39 (two-layer coil).
  • the plug 37 made of MoV the plug 37 is first connected to the molybdenum tube 35 by sintering.
  • the tube 35 After evacuation and filling, the tube 35 is closed with a metal pin 36 which is welded to the tube 35.
  • the tube 35 is welded to the plug 37 at the same time. That is, the endgommeti ⁇ takes place ge, permanent sealing of the bore of the plug 19 by welding, as this technique is superior to a direct sintering.
  • the pipe technology is also very suitable for large wattages in which the electrode has a large diameter and large transverse dimensions.
  • the pipe diameter is relatively uncritical because the difference in thermal expansion behavior between the bushing and the outermost layer at the end of the plug can be kept very small.
  • a similar material, in particular the same material, is selected for the tube and the outermost layer of the stopper.
  • the bushing is made of pure molybdenum (pin or tube).
  • the above values are selected such that the difference in ther ⁇ mix expansion coefficient is small, and have approximately the same distance to each other. The load is therefore evenly distributed.
  • a temperature of 1000 ° C. is used as a benchmark.
  • a high pressure sodium lamp 20 is shown in FIG.
  • the discharge vessel 21 is made of Al 2 O 3 and has the shape of a tube with a constant diameter, in the end of which a plug 22 made of MoV is sintered.
  • the same composition of the materials can be used as for metal halide lamps, with regard to the discharge vessel and the stopper.
  • the filling contains sodium and mercury as well as noble gas, as is known per se.
  • the outer diameter of the bushing 23, for example made of niobium, is matched as well as possible to the diameter of the bore 24 in the stopper and corresponds in particular to an accuracy of at least 95%.
  • the implementation can advantageously also be a pin made of tungsten or molybdenum or rhenium, in particular also be coated with rhenium. This results in a particularly reliable welding with the plug made of MoV.
  • a glass solder can additionally improve the seal, which is applied in a known manner to the outside of the contact zone between the stopper and the discharge vessel.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

A au moins une extrémité (6a) d'une lampe à halogénure métallique comprenant une enceinte de décharge céramique, l'obturateur (11) est fait uniformément d'un alliage de MoV. L'obturateur est soudé à l'extérieur avec la voie de passage (9).
EP06841274A 2005-12-09 2006-11-29 Lampe a decharge haute pression comprenant une enceinte de decharge ceramique Withdrawn EP1958239A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005058896A DE102005058896A1 (de) 2005-12-09 2005-12-09 Hochdruckentladungslampe mit keramischem Entladungsgefäß
PCT/EP2006/069043 WO2007065822A2 (fr) 2005-12-09 2006-11-29 Lampe a decharge haute pression comprenant une enceinte de decharge ceramique

Publications (1)

Publication Number Publication Date
EP1958239A2 true EP1958239A2 (fr) 2008-08-20

Family

ID=37907150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06841274A Withdrawn EP1958239A2 (fr) 2005-12-09 2006-11-29 Lampe a decharge haute pression comprenant une enceinte de decharge ceramique

Country Status (6)

Country Link
US (1) US20090267513A1 (fr)
EP (1) EP1958239A2 (fr)
JP (1) JP4696163B2 (fr)
CA (1) CA2630657A1 (fr)
DE (1) DE102005058896A1 (fr)
WO (1) WO2007065822A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014208729A1 (de) 2014-05-09 2015-11-12 Incoatec Gmbh Zweiteilige Hochspannungs-Vakuumdurchführung für eine Elektronenröhre

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1465821A (fr) * 1966-01-06 1967-01-13 Gen Electric Co Ltd Perfectionnements aux fermetures de tubes à décharge en oxydes réfractaires
GB1318658A (en) * 1970-12-18 1973-05-31 Gen Electric Co Ltd Closure of envelopes of high alumina content material
US4366410A (en) * 1980-11-21 1982-12-28 Gte Laboratories Incorporated Vacuum-tight assembly particularly for a discharge tube
ATE35481T1 (de) * 1982-11-18 1988-07-15 Emi Plc Thorn Absperrglieder fuer entladungslampe.
JPS62213061A (ja) * 1986-03-13 1987-09-18 Toshiba Corp セラミツク放電灯
DE19727428A1 (de) * 1997-06-27 1999-01-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Metallhalogenidlampe mit keramischem Entladungsgefäß
DE19727429A1 (de) * 1997-06-27 1999-01-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Metallhalogenidlampe mit keramischem Entladungsgefäß

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007065822A3 *

Also Published As

Publication number Publication date
WO2007065822A2 (fr) 2007-06-14
DE102005058896A1 (de) 2007-06-14
WO2007065822A3 (fr) 2007-08-09
JP4696163B2 (ja) 2011-06-08
JP2009518793A (ja) 2009-05-07
US20090267513A1 (en) 2009-10-29
CA2630657A1 (fr) 2007-06-14

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