EP2526563A1 - Verfahren zum herstellen einer elektrode für eine hochdruckentladungslampe und hochdruckentladungslampe mit mindestens einer derart hergestellten elektrode - Google Patents
Verfahren zum herstellen einer elektrode für eine hochdruckentladungslampe und hochdruckentladungslampe mit mindestens einer derart hergestellten elektrodeInfo
- Publication number
- EP2526563A1 EP2526563A1 EP11778853A EP11778853A EP2526563A1 EP 2526563 A1 EP2526563 A1 EP 2526563A1 EP 11778853 A EP11778853 A EP 11778853A EP 11778853 A EP11778853 A EP 11778853A EP 2526563 A1 EP2526563 A1 EP 2526563A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- discharge lamp
- oxide layer
- pressure discharge
- laser beam
- 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.)
- Granted
Links
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
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
-
- 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
- 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
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2201/00—Electrodes common to discharge tubes
- H01J2201/19—Thermionic cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2209/00—Apparatus and processes for manufacture of discharge tubes
- H01J2209/02—Manufacture of cathodes
Definitions
- the present invention relates to a method for producing an electrode for a high-pressure discharge lamp. It also relates to a high-pressure discharge lamp having at least one electrode produced in this way.
- the emissivity of electrodes of discharge lamps has a decisive influence on the performance and the geometric design of such discharge lamps.
- the prior art is the pasting with metal powders or mixtures by means of an organic binder and the subsequent sintering or baking to the electrode body.
- the pasted and sintered layer is mechanically less stable, which can lead to partial crumbling on contact.
- a method for processing an electrode of a discharge lamp is known.
- the electrode is oxidized in the region in which it is pinched gas-tight in the neck of a discharge space formed of glass.
- the oxidation is carried out by chemical routes in normal air atmosphere and ambient air pressure at a temperature between 700 and 1300 K.
- the oxide layer is then sublimed in a vacuum environment, the temperature during the sublimation between see 1450 K and 1900 K amounts to.
- ⁇ receives the electrode in said region, a surface with fine roughness, whereby the adhesion of the surface of this electrode portion on Entladungsge- fäßmaterial is reduced. This reduces the risk of cracking in the sealed area of the discharge vessel.
- the oxide layer also removes any contaminants from the surface of the electrode portion, thereby also reducing adhesion.
- a discharge lamp in which a rod-shaped tungsten electrode ⁇ range, in a neck of a discharge vessel by a gas tight pinch is introduced and by area, in a discharge space of the discharge vessel extends.
- the surface of the electrode will bear ⁇ beitet.
- an oxide layer on the surface In this case, for example, a tungsten trioxide layer can be produced.
- the oxidized electrode is then heated at about 1200 ° C in egg ⁇ nem hydrogen furnace, springing up in the hydrogen in the water.
- EP 1 251 548 A1 teaches a method of improving the thermal radiation characteristics of electrodes in a high-pressure discharge lamp of the short arc type.
- gutters are inserted into the surface of the introduced electrodes.
- the grooves have a depth that is less than or equal to 12% of the electrode diameter, with the ratio of the depth and spacing of the grooves being greater than or equal to two.
- a laser device can be used for introducing the grooves.
- the grooves may be angular or curved, wherein the surface is ground to produce curved grooves and then electrolytically polished in a 10% sodium hydroxide solution. Curved channels can however also be produced by heating to a high temperature in a vacuum, for example by heating the surface at 2000 ° C. for 120 minutes.
- the object of the present invention is to provide a method for producing an electrode for a high-pressure discharge lamp, with which the highest possible emissivity for the electrodes can be achieved.
- the surface of the electrode should be as resistant as possible to me ⁇ chanically.
- the object further consists provide a high pressure discharge lamp with min- least one electrode thus prepared panoramic ⁇ .
- the present invention is based on the finding that a high emissivity can basically be achieved if the electrode has an improved thermal conductivity. has beautiful emission behavior.
- the thermal Ab ⁇ radiation behavior can be improved by increasing the surface of the electrode. However, it must be si ⁇ chergues that despite increased surface area of the electrode, the conductivity of the electrode be ⁇ is not impaired.
- the electrode surface for generating an oxide layer is first coated with a high-energy beam suitable for this purpose, for example an electromagnetic beam, in particular a laser beam or an electron or ion beam.
- a high-energy beam suitable for this purpose for example an electromagnetic beam, in particular a laser beam or an electron or ion beam.
- the sweep is carried out in step a) at ⁇ least on a part of the electrode which is not embedded by the assembly of the electrode in the glass bulb of the high pressure discharge lamp in the glass of the glass bulb.
- the processing on the part of the electrode can be ⁇ be limited, which is for the emission of importance results in a time saving and thus a reductive ⁇ tion of the manufacturing cost.
- step a) is carried out on the atmosphere, in particular the oxygen-enriched atmosphere. Since the electrode usually consists predominantly of tungsten, ie in particular of doped tungsten, and tungsten is very reactive towards oxygen, it is thus possible to produce tungsten oxide in a simple manner.
- step b) is carried out at the same time as step a).
- step c) is preferably carried out in a hydrogen-containing atmosphere, in particular in an argon-hydrogen mixture.
- a preferred argon-hydrogen mixture is known by the name VARIGON®. This makes it particularly easy to provide the possibility that the oxygen from the tungsten oxide with the hydrogen from the atmosphere in which step c) is performed, connects to water. On the electric ⁇ surfaces are designed the pure metal remains.
- the electrode comprises preferably tungsten,) tungsten oxide is reduced to pure Wolf ⁇ ram in step c.
- the coating is preferably carried out in step a) by means of a laser beam device.
- a laser beam device precisely that part of the electrode surface which is important for the emissivity can be processed with particular precision. Unlike a chemical processing different areas of the electrode surface can be swept under ⁇ different.
- a further optimization with regard to a high emissivity can be carried out. Scanning with a laser beam device allows a precise setting of a desired emissivity with regard to the adjustable parameters such as energy density, line spacing, focus, and the like.
- the laser beam device is designed, in particular, to release an energy density which makes it possible to melt, oxidize and sublime at least part of the electrode surface.
- step a) the laser beam device with a frequency between 1 kHz and 100 kHz, in particular 10 kHz, are clocked.
- step a) preferably rows with a line spacing between two adjacent lines are preferably interposed on the electrode surface 0.01 and 0.2 mm, in particular 0.1 mm generated.
- the laser beam device is preferably operated with a laser beam focus between 0.01 and 0.1 mm, in particular 0.02 mm. In this way, the electrode surface can be maximized, whereby at the same time the emissivity of the electrode becomes maximum.
- the sweep can also be performed with other suitable beam devices such as electron beam or ion beam devices according to a preferred disclosed embodiment of the inventive method step), Runaway ⁇ leads c at a temperature between 700 ° C and 2500 ° C, in particular 2200 ° C.
- Step a) is preferably carried out at ambient ⁇ temperature, in particular a temperature between 15 ° C and 30 ° C, and ambient pressure.
- FIG. 1 shows a schematic representation of a high-pressure discharge lamp according to the invention
- FIG. 2 shows a signal flow graph for an exemplary embodiment of a method according to the invention
- FIG. 3 shows a section of the anode of the high-pressure discharge lamp illustrated in FIG. 1;
- FIG. 3 shows a section of the anode of the high-pressure discharge lamp illustrated in FIG. 1;
- Fig. 4 is a first enlarged view of a first
- FIG. 5 is a first enlarged view of a second
- FIG. 6 is an enlarged view of Darge ⁇ presented in Figure 5 Clipping; and FIG. 7 is an enlarged view of the detail shown in FIG.
- the high-pressure discharge lamp 10 includes a discharge vessel 12 with a dis- charges space 14.
- a first electrode 16 anode
- a second electrode 18 extend (cathode).
- the electrode 16 is melted in the neck 22, the electrode 18 in the neck 20th
- the electrodes 16, 18 are located on bars 24, 26 which are ge ⁇ preferably forms of tungsten or a tungsten alloy.
- the electrodes 16, 18 themselves consist of doped tungsten.
- step 100 at least a part of the surface of the electrode 16 by means of a laser beam coated with ⁇ device.
- the energy density is so high is that a part of the electric ⁇ surfaces are designed to melt, oxidized and sublimated. This means that a part of the resulting tungsten oxide goes into the gaseous state, another part of the tungsten oxide remains on the electrode surface.
- Step 120 is preferably carried out in a Sauerstoffangerei ⁇ cherten atmosphere.
- the laser beam device can be clocked with a frequency between 1 kHz and 100 kHz, in particular 10 kHz.
- lines with a line spacing between two adjacent lines between 0.01 and 0.2 mm, in particular 0.1 mm are produced on the electrode surface.
- a TEN OF PREFERRED guiding the laser beam device is operated with a laser beam focus between 0.01 and 0.1 mm, in particular 0.02 mm ⁇ sondere, form.
- the laser beam device for example, a power between 50 W and 200 W, preferably about 120 W, leave.
- the sweeping can, for example, at a speed between 10 mm / s and 100 mm / s, in particular 30 mm / s, take place.
- the temperature temperature can be ambient temperature; the pressure is preferably ambient pressure.
- a preferred laser beam device is known under the name rofin rsmarker and is operated with Galvo head.
- the power is in this embodiment ⁇ example about 120 W, whereby a current of about 38 A flows.
- the sweeping speed is approx. 30 mm / s.
- the electrode 16 is rotatably mounted, so that the entire circumference can be structured by the laser beam device.
- the step 120 creates a very rough oxidic surface. This is not defined geometrically, as will be explained in more detail below with reference to the further figures.
- the electrode 16 is preferably inductively heated in a VARIGON atmosphere.
- the oxidized parts of the surface are reduced by the existing hydrogen to metallic tungsten and water.
- the surface is impurity ⁇ free because unlike the prior art, no binder must be used in a Bepastungspens.
- the E- lektrode has a very good coupling characteristic in the inductive heating, and is mechanically stable, i.e., the electrode surface shows no tendency to crumble ⁇ ERS.
- Step 140 is preferably carried out at a temperature between 700 ° C and 2500 ° C, in particular 2200 ° C, performed. The method according to the invention ends in step 160.
- FIG. 3 shows an enlarged view of the area of the surface of the electrode 16 of FIG. 1, in which the shape changes from cylindrical to conical.
- the magnification is 10: 1.
- Fig. 4 shows an enlarged view of an off ⁇ section of Fig. 3 in the transition region cylindrical cone -shaped.
- the magnification is 1: 30.
- Fig. 5 shows a detail of Fig. 3 in the cylindrical region.
- FIG. 6 shows an enlarged detail of the illustration in FIG. 5.
- Ribs can be clearly recognized, the irregularity of the surface falling into the eye. By the irregularity results in a clear increase of the electrode surface, which can be achieved high Emissionsgra ⁇ de.
- FIG. 7 shows the detail of a rib in the illustration of FIG. 6.
- the magnification is 1: 1000. This illustration emphasizes the high roughness of the tungsten surface of the electrode.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010043463A DE102010043463A1 (de) | 2010-11-05 | 2010-11-05 | Verfahren zum Herstellen einer Elektrode für eine Hochdruckentladungslampe und Hochdruckentladungslampe mit mindestens einer derart hergestellten Elektrode |
PCT/EP2011/069030 WO2012059435A1 (de) | 2010-11-05 | 2011-10-28 | Verfahren zum herstellen einer elektrode für eine hochdruckentladungslampe und hochdruckentladungslampe mit mindestens einer derart hergestellten elektrode |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2526563A1 true EP2526563A1 (de) | 2012-11-28 |
EP2526563B1 EP2526563B1 (de) | 2014-10-08 |
Family
ID=44906091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11778853.9A Not-in-force EP2526563B1 (de) | 2010-11-05 | 2011-10-28 | Verfahren zum herstellen einer elektrode für eine hochdruckentladungslampe und hochdruckentladungslampe mit mindestens einer derart hergestellten elektrode |
Country Status (6)
Country | Link |
---|---|
US (1) | US8876570B2 (de) |
EP (1) | EP2526563B1 (de) |
JP (1) | JP5693740B2 (de) |
CN (1) | CN103189958B (de) |
DE (1) | DE102010043463A1 (de) |
WO (1) | WO2012059435A1 (de) |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE721503C (de) | 1940-03-14 | 1942-06-08 | Aeg | Hochdruckentladungslampe mit Wasserstoffuellung |
DE4206002A1 (de) | 1992-02-27 | 1993-09-02 | Philips Patentverwaltung | Verfahren zum erzeugen eines musters in der oberflaeche eines werkstuecks |
JP3283116B2 (ja) | 1993-08-31 | 2002-05-20 | 株式会社東芝 | 酸化物陰極の製造方法 |
EP0903771B1 (de) * | 1997-09-19 | 2004-03-03 | Matsushita Electric Industrial Co., Ltd. | Hochdruckentladungslampe und Verfahren zur Herstellung derselben |
US6626725B1 (en) | 2000-05-08 | 2003-09-30 | Welch Allyn, Inc | Electrode treatment surface process for reduction of a seal cracks in quartz |
JP4512968B2 (ja) * | 2000-08-03 | 2010-07-28 | ウシオ電機株式会社 | ショートアーク型高圧放電ランプ |
AT5322U1 (de) * | 2001-05-11 | 2002-05-27 | Plansee Ag | Verfahren zur herstellung einer hochdruck-entladungslampe |
JP3648184B2 (ja) * | 2001-09-07 | 2005-05-18 | 株式会社小糸製作所 | 放電ランプアークチューブおよび同アークチューブの製造方法 |
JP4427391B2 (ja) | 2003-09-24 | 2010-03-03 | 東芝ライテック株式会社 | 高圧放電ランプおよび高圧放電ランプの製造方法 |
DE10360545A1 (de) | 2003-12-22 | 2005-07-14 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Elektrode für eine Hochdruckentladungslampe |
JP4453487B2 (ja) * | 2004-08-24 | 2010-04-21 | 岩崎電気株式会社 | 高圧放電ランプの酸素封入方法 |
JP4509754B2 (ja) * | 2004-12-02 | 2010-07-21 | 株式会社小糸製作所 | 放電ランプ装置用アークチューブおよび同アークチューブの製造方法 |
JP4815839B2 (ja) * | 2005-03-31 | 2011-11-16 | ウシオ電機株式会社 | 高負荷高輝度放電ランプ |
DE102007003486A1 (de) * | 2007-01-24 | 2008-07-31 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Verfahren zum Bearbeiten einer Elektrode einer Entladungslampe |
DE102007015243A1 (de) * | 2007-03-29 | 2008-10-02 | Osram Gesellschaft mit beschränkter Haftung | Glühlampe mit strukturiertem Leuchtkörper |
JP4636156B2 (ja) | 2008-10-01 | 2011-02-23 | ウシオ電機株式会社 | ショートアーク型放電ランプ |
JP4872999B2 (ja) | 2008-12-01 | 2012-02-08 | ウシオ電機株式会社 | 高圧放電ランプ |
-
2010
- 2010-11-05 DE DE102010043463A patent/DE102010043463A1/de not_active Withdrawn
-
2011
- 2011-10-28 US US13/883,723 patent/US8876570B2/en not_active Expired - Fee Related
- 2011-10-28 CN CN201180053479.XA patent/CN103189958B/zh not_active Expired - Fee Related
- 2011-10-28 WO PCT/EP2011/069030 patent/WO2012059435A1/de active Application Filing
- 2011-10-28 JP JP2013537087A patent/JP5693740B2/ja not_active Expired - Fee Related
- 2011-10-28 EP EP11778853.9A patent/EP2526563B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2012059435A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2014500585A (ja) | 2014-01-09 |
US8876570B2 (en) | 2014-11-04 |
WO2012059435A1 (de) | 2012-05-10 |
CN103189958B (zh) | 2016-08-03 |
JP5693740B2 (ja) | 2015-04-01 |
US20130221842A1 (en) | 2013-08-29 |
CN103189958A (zh) | 2013-07-03 |
EP2526563B1 (de) | 2014-10-08 |
DE102010043463A1 (de) | 2012-05-10 |
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