EP1439567A2 - Elektrode für eine Hochdruckentladungslampe - Google Patents
Elektrode für eine Hochdruckentladungslampe Download PDFInfo
- Publication number
- EP1439567A2 EP1439567A2 EP03029105A EP03029105A EP1439567A2 EP 1439567 A2 EP1439567 A2 EP 1439567A2 EP 03029105 A EP03029105 A EP 03029105A EP 03029105 A EP03029105 A EP 03029105A EP 1439567 A2 EP1439567 A2 EP 1439567A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- vessel
- emitter
- curvature
- electrode according
- 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
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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
- H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
- H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
- H01J61/22—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent vapour of an alkali metal
-
- 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
Definitions
- the invention is based on an electrode for a high-pressure discharge lamp according to the preamble of claim 1. It is in particular Electrodes for high pressure discharge lamps containing sodium, in particular around high pressure sodium lamps. Another area of application is, for example pure Hg high pressure discharge lamps.
- the object of the present invention is an electrode according to the preamble of claim 1 to provide, counteracting premature aging of the lamp becomes.
- the emitters used in discharge lamps show one in particular during operation High mobility in the discharge vessel caused by sputtering.
- the emitter substances are therefore deposited on all walls of the discharge vessel over time. They also intervene sustainably in the chemical and physical processes during lamp operation, in particular they can change the filling. Overall, the useful life of the lamp is therefore shortened.
- the emitter and also its reservoir located in a safe place where it is not exposed to a sputtering process is.
- the emitter material that lowers the electron work function often it is an oxide or an oxidic material like Ba-, Ca-, Y-tungstate, is in open, centric or also introduced eccentric holes, which are on the arc side end of the electrode, either in the core pin, which protrudes in particular, or in the head the electrode itself.
- eccentric holes With a suitable choice of the diameter of the borehole and its volume, as well as with the appropriate design of the borehole edge, can be on an additional cover or alternatively special depth of the borehole, to be dispensed with.
- a lowering of the emitter level ie the level of the surface of the emitter, largely in the borehole to be dispensed with.
- the emitter-filled body can be conventionally with an outer winding be made of high-melting metal.
- the winding can have one or more layers his. This winding can serve as a bow approach and gives a higher one Heat capacity.
- a high-melting metal is used as the base material for the production of the electrode, mostly tungsten, tantalum, rhenium or an alloy or a carbide of these Metals.
- the electrode is in the discharge vessel through a power supply supported and led out of a discharge vessel.
- the electrode according to the invention can be used in all cylindrical symmetrical ceramic as well as in glass-made discharge vessels for high-pressure discharge lamps be used.
- the work function-lowering emitter material becomes placed in an open hole at the arc end of the electrode located.
- the emitter material can be a pellet, ie a solid. but also the Application of a liquid or paste is possible, with a simple application is made possible by an immersion bath treatment. A second step is then the formation if necessary. This depends on whether the emitter is oxidic is or not.
- the electrode can be easily manufactured if the edge of the borehole is suitable is shaped.
- the borehole is surrounded by a collar that defines a defined one Has inner and outer radius. These are chosen so that the approach of the discharge arc preferably takes place on the outer part of the collar.
- the inner part that forms the edge of the borehole must be sufficiently burr-free become.
- the surface of the emitter material in the borehole is preferably concave designed.
- the diameter, the depth and the centricity of the emitter-filled inner volume, preferably designed as a borehole, selected in such a way that both an injury to the outer wall of the core pin is excluded, as well the maximum amount of emitter that can be filled compared to conventional pasting is of a similar order of magnitude.
- a correspondingly solid head of the electrode can be selected be made solid or as a sintered body.
- Figure 1 is a high pressure sodium lamp 1 with a power of 70 W. shown with a ceramic discharge vessel 2 sealed on both sides. In the ends 3, two external power leads 5 are sealed by means of glass solder 4, which are connected to electrodes 6 inside the discharge vessel are.
- FIG. 2 shows an enlarged representation of the electrodes 6.
- the electrodes 6 consist of core pins 7, on which a helical body 8 is pushed. This forms the head part. Both components are made of tungsten.
- the diameter of the core pin is 700 microns, which is the spiral body 8 maximum 1700 ⁇ m, with a wire diameter of 200 ⁇ m.
- the spiral body 8 consists of two layers 8a and 8b of windings.
- the end of the core pin 7 protrudes on the discharge side against the coil body 8. It forms the emitter vessel 9 with a central bore 16, which is almost completely is filled with emitter material 10. This has a concave discharge side Surface 11 near the end of bore 16.
- Fig. 3 shows enlarged that the vessel wall 12 forms a collar that forms can be divided into an inner collar part 13, which is convex towards the bore and has the radius of curvature Ri, and an outer collar part 14, which is convexly curved toward the outer side wall 15 of the vessel with the same radius of curvature Ra as Ri.
- a specific emitter material in addition to the tungstates is thorium oxide.
- the concrete dimensions of the emitter vessel are as follows: outer diameter 700 ⁇ m Inner diameter 300 ⁇ m Hole depth 4.5 mm Inner radius of curvature Ri 140 ⁇ m Outer radius of curvature Ra 140 ⁇ m
- Figure 4 shows another embodiment of an electrode 19 in which the emitter vessel through the head 20 of the electrode, which is formed as a sintered body made of tungsten is, is shaped. It sits on a separate shaft 21 made of solid tungsten.
- the emitter material is a pellet 22 in the central borehole 23.
- the radii of curvature of the inner and outer collar part 24 and 25 are of different sizes. For example the inner radius of curvature is 140 ⁇ m and the outer radius of curvature 60 ⁇ m.
- the overall dimensions of such massive electrodes are in the order of magnitude of similar electrodes based on a core pin with an outer winding.
- FIG. 5 shows an exemplary embodiment in which the inner collar part 26 has a defined radius of curvature, and this with the outer collar part 27 over a straight piece, as a tangent to it (infinite radius of curvature), connected is.
- the outer collar part is an edge with a radius of curvature Zero.
- Figure 5b shows an embodiment in which the inner and outer collar part 26 and 27 has a defined radius of curvature, and between the inner and outer collar part a connecting tangent 28 is present.
- figure 5c shows an embodiment similar to FIG.
- Figure 5d shows an embodiment with a cone-like collar, inner and outer Radius of curvature of the inner and outer collar part 30 and 31 different and the collar parts are not smooth, but butt against each other with tip 32.
- a suitable manufacturing process is spark or electrode erosion.
- Another one Technology is laser ablation.
- That of the surface of the outer The electrical field strength generated by the collar is greater than that from the surface of the inner collar part should be generated electric field strength. Is crucial not the absolute value of the radii of curvature, but their relation to each other.
- the width of the inner collar part can advantageously be at least 20% and typical 40 to 60% of the wall thickness of the emitter vessel.
Landscapes
- Discharge Lamp (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
- Figur 1
- eine Hochdruckentladungslampe, im Schnitt;
- Figur 2
- eine Elektrode für die Lampe der Figur 1, im Schnitt;
- Figur 3
- einen vergrößerten Ausschnitt der Elektrode aus Figur 2;
- Figur 4
- ein weiteres Ausführungsbeispiel einer Elektrode für die Lampe der Figur 1, im Schnitt;
- Figur 5
- weitere Ausführungsbeispiele von Elektrodengefäßen.
Außendurchmesser | 700 µm |
Innendurchmesser | 300 µm |
Tiefe des Bohrlochs | 4,5 mm |
Innerer Krümmungsradius Ri | 140 µm |
Äußerer Krümmungsradius Ra | 140 µm |
Claims (9)
- Elektrode aus hochschmelzendem, elektrisch leitendem Material, bestehend aus einem stiftförmigen Schaft (7) mit einem Kopfteil (8), wobei die Elektrode im Bereich ihres entladungsseitigen Endes ein Gefäß (9) für einen Emitter bildet, in dem eine Bohrung angebracht ist, die mit Emittermaterial (10) gefüllt ist, dadurch gekennzeichnet, dass das Gefäß an seiner entladungsseitigen Stirnfläche einen Kragen bildet, mit einem inneren Kragenteil (13) das zur Bohrung hin konvex gekrümmt ist und einem äußeren Kragenteil (14), das zur Seitenwand des Gefäßes hin konvex gekrümmt ist.
- Elektrode nach Anspruch 1, dadurch gekennzeichnet, dass mindestens eine der konvexen Krümmungen einen definierten Krümmungsradius aufweist.
- Elektrode nach Anspruch 2, dadurch gekennzeichnet, dass beide Krümmungen einen definierten Krümmungsradius besitzen.
- Elektrode nach Anspruch 3, dadurch gekennzeichnet, dass der innere Krümmungsradius Ri des inneren Kragenteils größer oder gleich dem äußeren Krümmungsradius Ra des äußeren Kragenteils ist, also Ri ≥ Ra.
- Elektrode nach Anspruch 1, dadurch gekennzeichnet, dass die entladungsseitige Oberfläche (11) des Emittermaterials konkav gekrümmt ist.
- Elektrode nach Anspruch 1, dadurch gekennzeichnet, dass das Gefäß vom entladungsseitigen Ende des Schafts, der als Kernstift (7) ausgeführt ist, gebildet wird.
- Elektrode nach Anspruch 1, dadurch gekennzeichnet, dass das Gefäß von einem separaten Kopfteil (20) der Elektrode gebildet wird.
- Elektrode nach Anspruch 1, dadurch gekennzeichnet, dass das Emittergefäß aus Wolfram gefertigt ist.
- Lampe mit einer Elektrode nach Anspruch 1.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10301478A DE10301478A1 (de) | 2003-01-16 | 2003-01-16 | Elektrode für eine Hochdruckentladungslampe |
DE10301478 | 2003-01-16 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1439567A2 true EP1439567A2 (de) | 2004-07-21 |
EP1439567A3 EP1439567A3 (de) | 2006-07-05 |
EP1439567B1 EP1439567B1 (de) | 2009-02-11 |
Family
ID=32520003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03029105A Expired - Lifetime EP1439567B1 (de) | 2003-01-16 | 2003-12-17 | Elektrode für eine Hochdruckentladungslampe |
Country Status (7)
Country | Link |
---|---|
US (1) | US6984939B2 (de) |
EP (1) | EP1439567B1 (de) |
JP (2) | JP4723190B2 (de) |
KR (1) | KR101036689B1 (de) |
AT (1) | ATE422708T1 (de) |
CA (1) | CA2455087A1 (de) |
DE (2) | DE10301478A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008074361A1 (de) * | 2006-12-18 | 2008-06-26 | Osram Gesellschaft mit beschränkter Haftung | Elektrode für eine entladungslampe |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10301478A1 (de) * | 2003-01-16 | 2004-07-29 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Elektrode für eine Hochdruckentladungslampe |
DE102009055123A1 (de) * | 2009-12-22 | 2011-06-30 | Osram Gesellschaft mit beschränkter Haftung, 81543 | Keramische Elektrode für eine Hochdruckentladungslampe |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2887603A (en) * | 1956-02-24 | 1959-05-19 | Philips Corp | Compact source lamp |
US3560790A (en) * | 1967-07-27 | 1971-02-02 | Perkin Elmer Corp | Alkali metal cathode lamps |
DE2125444A1 (de) * | 1970-05-25 | 1971-12-09 | Gen Electric | |
US3798492A (en) * | 1971-05-17 | 1974-03-19 | Itt | Emissive electrode |
JPH05325892A (ja) * | 1992-05-15 | 1993-12-10 | Hitachi Ltd | 高圧ナトリウムランプ |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL99793C (de) * | 1957-08-10 | 1961-11-15 | ||
US3114855A (en) * | 1961-06-27 | 1963-12-17 | Bausch & Lomb | Gas discharge lamp with a collimating reflector electrode |
US3777200A (en) * | 1971-05-14 | 1973-12-04 | Nasa | High powered arc electrodes |
US3916241A (en) | 1972-06-14 | 1975-10-28 | Gte Sylvania Inc | High pressure electric discharge lamp and electrode therefor |
JPS4950776A (de) * | 1972-06-14 | 1974-05-17 | ||
US3983440A (en) * | 1973-01-08 | 1976-09-28 | Thorn Electrical Industries Limited | Discharge lamp component |
DE2424549A1 (de) * | 1973-05-23 | 1974-12-12 | John Michael Prof Thompson | Stroemungsmittelanalysiergeraet |
JPS5133356A (ja) | 1974-09-14 | 1976-03-22 | Shinko Burain Kk | Hakeikeishabannyoruchinkobunrisochi |
JPH0276463U (de) * | 1988-11-30 | 1990-06-12 | ||
US5686789A (en) * | 1995-03-14 | 1997-11-11 | Osram Sylvania Inc. | Discharge device having cathode with micro hollow array |
JP2938838B2 (ja) | 1998-01-26 | 1999-08-25 | ティーディーケイ株式会社 | 放電灯用電極とその製造方法 |
JP2002141018A (ja) * | 2000-11-06 | 2002-05-17 | Ushio Inc | 放電ランプ |
JP2002289134A (ja) | 2001-03-27 | 2002-10-04 | West Electric Co Ltd | 冷陰極放電管及び照明装置 |
DE10301478A1 (de) * | 2003-01-16 | 2004-07-29 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Elektrode für eine Hochdruckentladungslampe |
-
2003
- 2003-01-16 DE DE10301478A patent/DE10301478A1/de not_active Withdrawn
- 2003-12-17 AT AT03029105T patent/ATE422708T1/de not_active IP Right Cessation
- 2003-12-17 EP EP03029105A patent/EP1439567B1/de not_active Expired - Lifetime
- 2003-12-17 DE DE50311168T patent/DE50311168D1/de not_active Expired - Lifetime
-
2004
- 2004-01-07 US US10/751,939 patent/US6984939B2/en not_active Expired - Fee Related
- 2004-01-13 CA CA002455087A patent/CA2455087A1/en not_active Abandoned
- 2004-01-14 KR KR1020040002584A patent/KR101036689B1/ko not_active IP Right Cessation
- 2004-01-16 JP JP2004009797A patent/JP4723190B2/ja not_active Expired - Fee Related
-
2010
- 2010-12-28 JP JP2010293698A patent/JP5150716B2/ja not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2887603A (en) * | 1956-02-24 | 1959-05-19 | Philips Corp | Compact source lamp |
US3560790A (en) * | 1967-07-27 | 1971-02-02 | Perkin Elmer Corp | Alkali metal cathode lamps |
DE2125444A1 (de) * | 1970-05-25 | 1971-12-09 | Gen Electric | |
US3798492A (en) * | 1971-05-17 | 1974-03-19 | Itt | Emissive electrode |
JPH05325892A (ja) * | 1992-05-15 | 1993-12-10 | Hitachi Ltd | 高圧ナトリウムランプ |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN Bd. 018, Nr. 139 (E-1519), 8. März 1994 (1994-03-08) -& JP 05 325892 A (HITACHI LTD), 10. Dezember 1993 (1993-12-10) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008074361A1 (de) * | 2006-12-18 | 2008-06-26 | Osram Gesellschaft mit beschränkter Haftung | Elektrode für eine entladungslampe |
US8138662B2 (en) | 2006-12-18 | 2012-03-20 | Osram Ag | Electrode for a discharge lamp |
Also Published As
Publication number | Publication date |
---|---|
DE50311168D1 (de) | 2009-03-26 |
US20040140767A1 (en) | 2004-07-22 |
KR101036689B1 (ko) | 2011-05-24 |
DE10301478A1 (de) | 2004-07-29 |
JP5150716B2 (ja) | 2013-02-27 |
US6984939B2 (en) | 2006-01-10 |
EP1439567B1 (de) | 2009-02-11 |
JP2011077057A (ja) | 2011-04-14 |
CA2455087A1 (en) | 2004-07-16 |
ATE422708T1 (de) | 2009-02-15 |
EP1439567A3 (de) | 2006-07-05 |
KR20040066019A (ko) | 2004-07-23 |
JP2004221090A (ja) | 2004-08-05 |
JP4723190B2 (ja) | 2011-07-13 |
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