EP1048052B1 - Verfahren zur herstellung einer elektrode für entladungslampen - Google Patents
Verfahren zur herstellung einer elektrode für entladungslampen Download PDFInfo
- Publication number
- EP1048052B1 EP1048052B1 EP98916838A EP98916838A EP1048052B1 EP 1048052 B1 EP1048052 B1 EP 1048052B1 EP 98916838 A EP98916838 A EP 98916838A EP 98916838 A EP98916838 A EP 98916838A EP 1048052 B1 EP1048052 B1 EP 1048052B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- pin
- solid body
- solid
- laser
- 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
Links
Images
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
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
- H01J61/0672—Main electrodes for low-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
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
- H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material 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
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
Definitions
- the invention relates to a method for producing a Electrode for discharge lamps with an at least partially surrounded by a solid body, the solid body is formed from a high-melting material and the solid is designed as a cylinder in which an axial bore is introduced.
- Electrodes of the type mentioned are in discharge lamps used to give off electrons in a gas discharge or record.
- the electrodes each contain one Pen, from the free end of which electrons emerge or enter the pen at this end, with the pen in the neighborhood of its free end usually partially is enclosed by a heat sink, which usually consists of one wire wound around the pin is formed. It did shown that both the attachment of such, from a coiled wire formed heat sink on the pin as also a robust fixation of the heat sink to the pin only can be achieved with great technical effort, the Results regarding a fixed fixation of the heat sink the pen are not satisfactory.
- EP 0 756 312 A1 describes an electrode with a heat sink high-melting metallic material known, the coaxial is applied to this. Using a powder metallurgical The heat sink material becomes solid with the process Electrode connected.
- the object of the invention is a method for the production to create an electrode for discharge lamps, in which the Heatsink is easily applied to the pen and making a robust unit with the Pin is connected.
- This task is in a process for producing a Electrode for discharge lamps with an at least partially solved by a solid-enclosed pin, in which the Solid is formed from a high-melting material and the solid is designed as a cylinder in which one axial bore is introduced by means of a laser.
- the feature that the solid is formed from a high-melting material is achieved that also the function of a heat sink solid body can be produced as a solid block, the both because of its material properties and its Dimensions can be firmly connected with the pin.
- the method according to the invention is the solid a material formed that has a melting point above of 1800 ° C.
- the solid is preferably formed from tungsten.
- the solid is preferably in the form of a cylinder formed, in which an axial bore is made.
- the axial bore is dimensioned so that the pin of the Electrode can be inserted into the bore. After this Insert the pin in the axial bore of the Solid body is the solid body with the pin by means of a A multitude of different methods to form a fixed unit connectable, as explained below.
- the hole is according to a preferred embodiment of the electrode according to the invention by means of a laser, especially a Nd: YAG laser in the cylinder brought in.
- the process is the solid from a plurality Partially arranged solid composed. This ensures that also special long electrode bodies according to the invention can be produced, which due to a limited depth of penetration of one Laser beam can not be produced in one piece.
- the end of the pin on the solid body side is welded to the end of the solid body surrounding it.
- This welding is preferably carried out by means of a laser, in particular an Nd: YAG or CO 2 laser, and has the effect that the common end of the pin and the solid body surrounding it is in the form of a convex dome, the edge region of which merges into the solid body.
- a tip of the electrode according to the invention formed in this way has the advantage that it is particularly effective and wear-resistant.
- the process is the solid with at least one Provide cross hole.
- a cross hole before Drilling an axial hole in a solid introduced, it enables deduction of those Evaporation particles to the outside that when inserting the axial bore by means of a laser.
- the education axial drilling by means of laser beams is due to this the rapid escape of the vapor particles especially from the area penetrated by laser beams effective.
- a Cross hole in a solid created the possibility the solid at a fixed point other than the crest to weld with the pin.
- the Possibility created the solid except one Only weld the tip at those points to weld the pin to which cross holes are provided.
- the welding of these fixed points preferably also carried out by means of laser beams.
- the introduction of cross holes in the solid also enables the introduction or dumping of Emission pastes in the cross holes.
- emission pastes generally such substances that have an electron emission convey the electrode.
- the The solid thus fulfills the electrode according to the invention lift a cooling function also the function, an increased Electron emission.
- the emission paste contains for example thorium oxide.
- the bore of the solid body of the electrode produced according to the invention preferably has an inner diameter that is larger than the diameter of the pin, the gap between the solid and the pin using a Melt is filled.
- the melt contains preferably molybdenum. But there are also tantalum, niobium, Titanium or platinum. This makes one robust connection between the solid and the pin created.
- the Solid body by means of a plurality from the outside on it impacting stamps are mechanically shrunk so far that he is in a mechanically tight connection with the pin occurs.
- the solid preferably at one or more fixed points with the pen welded, the corresponding welding process is preferably generated by laser radiation. Also through one in particular at a plurality of fixed points welding the solid directly to the pin, in Area of common outer contact edges or in Area of cross holes, is a solid mechanical connection allows between the solid and the pin.
- Electrodes 11, 11 ' arranged within a quartz glass bulb 12 in such a way that one end each, which is also called an electrode pin 13, 13 'is referred to, in the glass bulb 12 is welded.
- the electrodes 11, 11 ' face each other opposite ends of the piston 12 are arranged.
- the electrode pins 13, 13 ' are over molybdenum foils 14, 14' with molybdenum pins 15, 15 'connected, each to the power connection are provided.
- the molybdenum foils 14, 14 ' act as Power supply elements within the glass bulb to the electrode pins 13, 13 '.
- the electrodes 11, 11 ' are each in the area of their ends 16, 16 'of an electrode body or heat sink 17, 17 'enclosed.
- Fig. 2 is a conventional electrode 11, as in one Discharge bulb 12 according to FIG. 1 is used in a Side view shown.
- the electrode body or heat sink 17 is made of a wound around the electrode pin 13 Wire formed, the ends 17a and 17b are exposed.
- the Wire can have two layers, as shown in the figure be wound in different directions.
- Electrode 11 is in place of a wire coil shown in FIG. 2 17 a hollow cylindrical solid body 17 as an electrode body or heat sink around the relevant part 18 of the Electrode pin 13 is provided.
- the electrode body 17 is manufactured as a solid block of a solid, which is formed from a high-melting material.
- the electrode 11 shown in FIG. 3 has a free electrode end 16 on.
- Electrode 11 denote the same reference numerals and the same components, as with the electrode shown in Fig. 3. The difference the electrode shown in FIG. 4 faces the latter 11, however, no separate electrode end 16.
- Electrode end 16a As shown in Fig. 5, is according to a preferred embodiment the electrode 11 shown in FIG. 4 the "flush" Electrode end 16a by means of a laser with the electrode body 17 welded so that an electrode end 16b is formed, its diameter in contrast to that shown in Fig. 3 Electrode end 16 is hemispherical on the outside is, and enlarged to the diameter of the electrode body 17 is.
- a manufactured according to the invention The electrode is therefore a particularly high constancy of the emitted Light intensity.
- Electrodes is a plurality of stamps 20, 21, 22, 23, 24, 25 arranged concentrically around an electrode 11.
- the stamp 20 to 25 are by means of a mechanism, not shown high pressure reproducibly movable in the direction of the arrow, whereby the electrode 11 shown in cross section in the center the stamp 20 to 25 is arranged so that the stamp 20th to 25 each at substantially the same times on the Rest electrode body 17 of electrode 11 and then applying the same force to the electrode body 17 in the direction of the electrode pin 18 press, taking deformation of both the electrode body 17 and the electrode pin 18 of the electrode body 17th pressed together with the electrode pin 18 to form a unit is, as in a corresponding, shown in cross section Electrode 11 is shown in Figure 7.
- the electrode produced is the electrode body 17 soldered to electrode pin 18 using tantalum as solder or welded.
- the soldering or welding of the electrode body 17 with the electrode pin 18 is an alternative Method compared to the method shown in FIG. 6 for permanent, firm connection of an electrode body 17 with an electrode pin 18.
- produced electrode has the bore of the solid 17 has an inner diameter that is larger than that Diameter of the pin 16 is, with the space between the solid body 17 and the pin 16 with the help of a Melt is filled.
- the melt contains molybdenum.
- produced electrode has the electrode body 17 cross bores 20, 20 '.
- the one shown in FIG Embodiment of an electrode produced according to the invention is the electrode body 17 in the transverse bores 20, 20 ' the electrode pin 13 welded for improved adhesion to have on the electrode body 13.
- the electrode produced is the electrode body 17 from a plurality of partial solid bodies arranged one behind the other 17 ', 17 ", 17' '' and 17 '' ''. Between these Recesses 22 are provided for partial solid bodies. The dimensions the recesses 22 can also be larger or smaller than be formed in the figure.
Landscapes
- Discharge Lamp (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Description
- Fig. 1
- eine herkömmliche Entladungslampe in einer Querschnittsansicht;
- Fig. 2
- eine herkömmliche Elektrode in einer Seitenansicht;
- Fig. 3
- eine bevorzugte Ausführungsform einer erfindungsgemäß hergestellten Elektrode in einer Querschnittsansicht;
- Fig. 4
- eine weitere bevorzugte Ausführungsform einer erfindungsgemäß hergestellten Elektrode in einer Querschnittsansicht;
- Fig. 5
- eine weitere bevorzugte Ausführungsform einer erfindungsgemäß hergestellten Elektrode in einer Querschnittsansicht;
- Fig. 6
- eine schematische Darstellung einer Vorrichtung zum Stempeln eines erfindungsgemäß hergestellten Elektrodenkörpers in einer Ansicht von oben;
- Fig. 7
- eine weitere bevorzugte Ausführungsform eines erfindungsgemäß hergestellten Elektrodenkörpers in einer Ansicht von vorne, nach einem Stempeln mittels der in Fig. 6 gezeigten Stempelvorrichtung;
- Fig. 8
- eine weitere bevorzugte Ausführungsform eines erfindungsgemäß hergestellten Elektrodenkörpers in einer Querschnittsansicht;
- Fig. 9
- eine weitere bevorzugte Ausführungsform eines erfindungsgemäß hergestellten Elektrodenkörpers in einer Querschnittsansicht;
- Fig. 10
- eine weitere bevorzugte Ausführungsform eines erfindungsgemäß hergestellten Elektrodenkörpers in einer Querschnittsansicht;
- Fig. 11
- eine weitere bevorzugte Ausführungsform eines erfindungsgemäß hergestellten Elektrodenkörpers in einer Querschnittsansicht.
Claims (16)
- Verfahren zur Herstellung einer Elektrode (11) für Entladungslampen mit einem mindestens teilweise von einem Festkörper (17) umschlossenen Stift (13, 16), wobei der Festkörper aus einem hochschmelzenden Material gebildet ist und der Festkörper (17) als Zylinder ausgebildet ist, in den eine axiale Bohrung eingebracht ist, dadurch gekennzeichnet, daß die Bohrung mittels eines Lasers eingebracht ist.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Material einen Schmelzpunkt oberhalb von 1800 °C aufweist.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Festkörper aus Wolfram gebildet ist.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß ein Nd:YAG-Laser verwendet wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das festkörperseitige Ende des Stiftes (13) mit dem es umschließenden Ende des Festkörpers (17) verschweißt wird.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß das Verschweißen des Endes des Stiftes mit dem Festkörper mittels eines Lasers durchgeführt wird.
- Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß ein Nd:YAG-Laser oder ein CO2-Laser verwendet wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Festkörper (17) aus einer Mehrzahl hintereinander angeordneter Teil-Festkörper (17', 17'', 17''', 17'''') zusammengesetzt ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Festkörper (17) mindestens eine Querbohrung (20) aufweist.
- verfahren nach Anspruch 9, dadurch gekennzeichnet, daß in die mindestens eine Querbohrung eine Emissionspaste eingebracht wird.
- Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die Emissionspaste Thoriumoxyd enthält.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß in den Festkörper (17) eine Bohrung eingebracht wird, deren Innendurchmesser größer als der Durchmesser des Stiftes (16) ist, wobei der Zwischenraum zwischen dem Festkörper und dem Stift mit Hilfe einer Schmelze ausgefüllt wird.
- Verfahren nach Anspruch 12, dadurch gekennzeichnet, daß die Schmelze Molybdän enthält.
- Verfahren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß der Festkörper eine Bohrung aufweist, deren Innendurchmesser größer als der Durchmesser des Stiftes ist, wobei der Zwischenraum zwischen dem Festkörper und dem Stift mittels einer Mehrzahl von von außen einwirkenden Stempeln mechanisch geschrumpft wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Festkörper an einem oder mehr Fixpunkten mit dem Stift verschweißt wird.
- Verfahren nach Anspruch 15, dadurch gekennzeichnet, daß der mindestens eine Fixpunkt mittels Laserstrahlen erzeugt wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19757152A DE19757152C2 (de) | 1997-12-20 | 1997-12-20 | Elektrode für Entladungslampen |
DE19757152 | 1997-12-20 | ||
PCT/DE1998/000624 WO1999033090A1 (de) | 1997-12-20 | 1998-03-04 | Elektrode für entladungslampen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1048052A1 EP1048052A1 (de) | 2000-11-02 |
EP1048052B1 true EP1048052B1 (de) | 2004-06-02 |
Family
ID=7852932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98916838A Expired - Lifetime EP1048052B1 (de) | 1997-12-20 | 1998-03-04 | Verfahren zur herstellung einer elektrode für entladungslampen |
Country Status (6)
Country | Link |
---|---|
US (1) | US6437509B1 (de) |
EP (1) | EP1048052B1 (de) |
JP (1) | JP2001527272A (de) |
AT (1) | ATE268503T1 (de) |
DE (2) | DE19757152C2 (de) |
WO (1) | WO1999033090A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1701371A1 (de) * | 2001-07-04 | 2006-09-13 | Fuji Photo Film Co., Ltd. | Verfahren zur Herstellung von Elektroden |
DE10256389A1 (de) * | 2002-12-02 | 2004-06-09 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Metallhalogenidlampe mit keramischem Entladungsgefäß |
CN101292324B (zh) * | 2003-05-26 | 2012-11-14 | 皇家飞利浦电子股份有限公司 | 具有改进的颜色稳定性的无钍电极 |
DE10360545A1 (de) * | 2003-12-22 | 2005-07-14 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Elektrode für eine Hochdruckentladungslampe |
JP4325518B2 (ja) * | 2004-09-10 | 2009-09-02 | ウシオ電機株式会社 | 超高圧水銀ランプ |
US7176632B2 (en) * | 2005-03-15 | 2007-02-13 | Osram Sylvania Inc. | Slotted electrode for high intensity discharge lamp |
US8610350B2 (en) * | 2009-12-15 | 2013-12-17 | Osram Gesellschaft Mit Beschraenkter Haftung | Electrode structures for discharge lamps |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2477279A (en) * | 1946-09-11 | 1949-07-26 | Hanovia Chemical & Mfg Co | Electrical discharge device |
NL272981A (de) * | 1961-01-02 | |||
NL282235A (de) * | 1962-08-17 | |||
NL7300381A (de) * | 1973-01-11 | 1974-07-15 | ||
US4340836A (en) | 1978-09-11 | 1982-07-20 | General Electric Company | Electrode for miniature high pressure metal halide lamp |
DE3240359A1 (de) | 1982-11-02 | 1984-05-03 | W.C. Heraeus Gmbh, 6450 Hanau | "elektrode fuer laseranregungslampen" |
JPS62241254A (ja) * | 1986-04-10 | 1987-10-21 | Ushio Inc | 放電灯 |
JP2561898B2 (ja) * | 1986-04-10 | 1996-12-11 | ウシオ電機 株式会社 | 放電灯 |
JPS62243235A (ja) * | 1986-04-16 | 1987-10-23 | Toshiba Corp | 高圧ナトリウムランプ |
JPS62249349A (ja) * | 1986-04-21 | 1987-10-30 | Toshiba Corp | 高圧ナトリウムランプ |
JPS62249348A (ja) * | 1986-04-21 | 1987-10-30 | Toshiba Corp | 高圧ナトリウムランプ |
JP3269124B2 (ja) * | 1992-07-29 | 2002-03-25 | 東芝ライテック株式会社 | 焼結電極を用いた放電灯 |
DE4327535A1 (de) * | 1993-08-16 | 1995-02-23 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Hochdruckentladungslampe mit keramischem Entladungsgefäß |
DE4338377A1 (de) | 1993-11-10 | 1995-05-11 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Metallhalogenidentladungslampe mit keramischem Entladungsgefäß und Herstellverfahren für eine derartige Lampe |
DE19527348A1 (de) * | 1995-07-26 | 1997-01-30 | Wolfram Ind Mbh Ges | Elektrode mit Kühlkörper |
JPH09231939A (ja) * | 1996-02-20 | 1997-09-05 | Tokyo Tungsten Co Ltd | 高融点金属電極,その製造方法,及びそれを用いた放電灯用電極 |
-
1997
- 1997-12-20 DE DE19757152A patent/DE19757152C2/de not_active Expired - Fee Related
-
1998
- 1998-03-04 WO PCT/DE1998/000624 patent/WO1999033090A1/de active IP Right Grant
- 1998-03-04 JP JP2000525908A patent/JP2001527272A/ja active Pending
- 1998-03-04 DE DE59811521T patent/DE59811521D1/de not_active Expired - Lifetime
- 1998-03-04 AT AT98916838T patent/ATE268503T1/de active
- 1998-03-04 US US09/581,197 patent/US6437509B1/en not_active Expired - Lifetime
- 1998-03-04 EP EP98916838A patent/EP1048052B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1048052A1 (de) | 2000-11-02 |
WO1999033090A1 (de) | 1999-07-01 |
DE59811521D1 (de) | 2004-07-08 |
ATE268503T1 (de) | 2004-06-15 |
DE19757152A1 (de) | 1999-07-01 |
DE19757152C2 (de) | 2002-10-31 |
JP2001527272A (ja) | 2001-12-25 |
US6437509B1 (en) | 2002-08-20 |
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