WO2010025769A1 - Elektrode für eine entladungslampe und entsprechendes herstellungsverfahren - Google Patents
Elektrode für eine entladungslampe und entsprechendes herstellungsverfahren Download PDFInfo
- Publication number
- WO2010025769A1 WO2010025769A1 PCT/EP2008/061728 EP2008061728W WO2010025769A1 WO 2010025769 A1 WO2010025769 A1 WO 2010025769A1 EP 2008061728 W EP2008061728 W EP 2008061728W WO 2010025769 A1 WO2010025769 A1 WO 2010025769A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- pin
- additives
- ppm
- coil
- Prior art date
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
- H01J61/04—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 present invention relates to an electrode for a discharge lamp, in particular high-pressure discharge lamp, wherein the electrode comprises a pin and a arranged at one end of the pin by overmolding an electrode coil mass, the pin consists of tungsten with geyoggestabil inconvenienceden additives, wherein the concentration of the additives greater than or equal to 30 ppm, preferably greater than 60 ppm, particularly preferably 80 ppm. It also relates to a corresponding method for producing an electrode for a discharge lamp.
- FIG. 1 shows a thermally highly loadable electrode known from the prior art, on the left before overmelting of the electrode coil, on the right after overmelting, in each case in a cross-sectional representation, as used, for example, for achieving good maintenance in high-pressure discharge lamps.
- high-purity tungsten is used both for the pin 12 and for the electrode coil 14, ie tungsten with additives whose concentration is less than or equal to 20 ppm.
- Overmelting of an electrode coil to produce a thermally compact Mass 16 is already known from DE 1 170 542.
- a committee due to the known brittleness is accepted or avoided by the most shock-free handling. A use, for example, as a car lamp is therefore not possible with such electrodes.
- FIG. 2 shows a further generic electrode known from the prior art in which tungsten is used with structure-stabilizing additives, for example potassium, the concentration of the additives being used both in the one used for the pencil and in that for the Electrode coil used material greater than or equal to 30 ppm. Although the brittleness is reduced, these additives have a negative effect on the life of the lamp. In addition, it is very difficult to melt over pattern-stabilized electrode filaments, since the stabilizing additives lead to the formation of voids 18. At present, such electrodes are used in high-impact applications, such as automotive lamps, and their life-cycle limitations are being accepted.
- structure-stabilizing additives for example potassium
- the object of the present invention is to develop a generic electrode or a generic method such that an electrode is provided which is characterized by the best possible maintenance and the longest possible lamp life with the greatest possible breaking strength.
- the present invention is based on the finding that the above object can be achieved if the pin is made of ge Schogestabiltekem tungsten to provide the necessary breaking strength, and an electrode coil of pure tungsten is used to a simple over melting without voids formation with good maintenance to enable. If such an electrode coil and such a pin is used, one obtains an electrode which is characterized on the one hand by high breaking strength on the other hand by a good maintenance and a long service life. A use in mechanically loaded lamps is readily possible.
- Tungsten is considered sufficiently pure for the electrode coil to contain at most 20 ppm of additives, including both undesirable additives, i. Impurities as well as functional additives.
- concentration of the additives of the electrode coil is less than or equal to 5 ppm, more preferably less than or equal to 1 ppm.
- the tungsten used for this purpose is provided with substrate-stabilizing additives.
- substrate-stabilizing additives In particular, potassium and / or thorium come into consideration.
- the concentration of the structure-stabilizing additives is at least 30 ppm, better 60 ppm, even better 80 ppm.
- the pin extends into the melting zone of the electrode coil. This allows the overmelting process to be carried out only near the surface or with a low energy input.
- the pin does not reach into the melting zone of the electrode coil. This ensures that the compact thermal mass, which is formed by overmelting, only very few shares of the pen and thus includes almost no additives.
- the overmelting process can be changed, in particular extended, to form a larger compact thermal mass, compared to the variant in which the pin extends into the melting zone of the electrode coil.
- a large compact thermal mass leads to a particularly good performance of the electrode.
- the pin does not extend into a front, pin-facing region of the electrode coil. This makes it particularly easy to ensure that in the compact thermal mass almost no shares of the pen and thus ideally no surcharges are included.
- the electrode coil preferably comprises between 3 and 20 windings, wherein the pin extends at least not into the front pin facing away from the pin, preferably not into the front, pin-facing third, of the windings.
- the windings of the electrode coil can be arranged at least partially in one layer.
- the windings of the electrode coil may additionally or alternatively, ie at least in part, be arranged one above the other in at least two layers.
- the one-piece pin-facing parts of the electrode coil, the pin facing part of the electrode coil formed in two or more layers. This makes it easy to influence the shape of the compact thermal mass.
- the overmelting is designed such that a compact thermal mass is formed, wherein the proportion of the pin of this compact thermal mass is less than or equal to 15%, preferably less than or equal to 1%.
- FIG. 1 shows a first electrode known from the prior art, on the left before the overmelting (a)), on the right after the overmelting of the electrode coil (b)), in each case in cross-sectional representation;
- FIG. 2 shows a second electrode known from the prior art, on the left before overmelting (a)), FIG. right after the overmelting of the electrode coil (b)), in each case in cross-sectional representation;
- FIG. 3 shows a first electrode according to the invention, on the left before the overmelting (a)), on the right after the overmelting of the electrode coil (b)), in each case in cross-section;
- FIG 4 shows a second electrode according to the invention, on the left before the overmelting (a)), on the right after the overmelting of the electrode coil (b)), in each case in cross-sectional representation.
- FIG. 3 shows a first embodiment of an electrode 10 according to the invention.
- the electrode coil 14 is arranged at the end of the pin 12, the pin 12 protruding completely through the electrode coil 14.
- the pin 12 is made of tungsten with ge Stirgestabil minimum additives, wherein the concentration of the additives is greater than or equal to 30 ppm, better 60 ppm, even better 80 ppm
- the electrode coil 14 is made of pure tungsten, the additions in a concentration of at most 20 ppm , preferably at most 5 ppm, more preferably at most 1 ppm.
- FIG. 3b shows a compact thermal mass 16 is generated by overmelting of the electrode coil 14, which thus forms a high-purity arc projection zone for the arc discharge.
- the pin 12 does not extend into a front, pin-facing region 20 of the electrode.
- This pin-facing region 20 is preferably a quarter, more preferably a third of the electrode coil 14.
- the variant of Fig. 4 allows the formation of a larger compact thermal mass 16 without the Proportion of additives in this compact thermal mass 16 goes beyond a predetermined threshold.
- the overmelting can take place, for example, by arc discharge, electron beam, laser, plasma, etc.
Landscapes
- Discharge Lamp (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/062,675 US8502439B2 (en) | 2008-09-05 | 2008-09-05 | Electrode for a discharge lamp and corresponding production method |
DE112008003969.0T DE112008003969B4 (de) | 2008-09-05 | 2008-09-05 | Elektrode für eine Entladungslampe, entsprechendes Herstellungsverfahren und entsprechende Entladungslampe |
PCT/EP2008/061728 WO2010025769A1 (de) | 2008-09-05 | 2008-09-05 | Elektrode für eine entladungslampe und entsprechendes herstellungsverfahren |
CN200880131025.8A CN102144276B (zh) | 2008-09-05 | 2008-09-05 | 用于放电灯的电极及相应的制造方法 |
JP2011525412A JP2012502412A (ja) | 2008-09-05 | 2008-09-05 | 放電ランプの電極とその製造方法 |
TW98129640A TWI467628B (zh) | 2008-09-05 | 2009-09-03 | 放電燈之電極及其製造方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/061728 WO2010025769A1 (de) | 2008-09-05 | 2008-09-05 | Elektrode für eine entladungslampe und entsprechendes herstellungsverfahren |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010025769A1 true WO2010025769A1 (de) | 2010-03-11 |
Family
ID=40561820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/061728 WO2010025769A1 (de) | 2008-09-05 | 2008-09-05 | Elektrode für eine entladungslampe und entsprechendes herstellungsverfahren |
Country Status (6)
Country | Link |
---|---|
US (1) | US8502439B2 (de) |
JP (1) | JP2012502412A (de) |
CN (1) | CN102144276B (de) |
DE (1) | DE112008003969B4 (de) |
TW (1) | TWI467628B (de) |
WO (1) | WO2010025769A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012063151A1 (en) * | 2010-11-10 | 2012-05-18 | Koninklijke Philips Electronics N.V. | Method of manufacturing an electrode for a gas discharge lamp. |
DE102011075899A1 (de) * | 2011-05-16 | 2012-11-22 | Osram Ag | Gasentladungslampe und Elektrode für eine Gasentladungslampe |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8786547B2 (en) * | 2010-12-23 | 2014-07-22 | Microsoft Corporation | Effects of gravity on gestures |
JP7233738B2 (ja) * | 2017-10-02 | 2023-03-07 | アイラーセン,ニルス アーゲ ジュール | 荷重計の持ち上がり防止デバイス |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5743352A (en) * | 1980-08-27 | 1982-03-11 | Toshiba Corp | Metal halide lamp |
US4950954A (en) * | 1988-12-07 | 1990-08-21 | Gte Products Corporation | Metal halide discharge lamp with electrodes having unequal thoria contents |
US20030020394A1 (en) * | 2000-05-12 | 2003-01-30 | Yoshiki Kitahara | High pressure discharge lamp with long life |
US20060208635A1 (en) * | 2005-03-15 | 2006-09-21 | Lenef Alan L | Slotted electrode for high intensity discharge lamp |
EP1763065A2 (de) * | 1999-02-10 | 2007-03-14 | Matsushita Electric Industrial Co., Ltd. | Elektrode für Hochdruck-Entladungslampe, Verfahren zur Herstellung der Elektrode und Verwendung der Lampe in einem Projektionsapparat |
US20070182332A1 (en) * | 2003-05-26 | 2007-08-09 | Koninklijke Philips Electronics N.V. | Thorium-free electrode with improved color stability |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS542244A (en) * | 1977-06-09 | 1979-01-09 | Mitsui Eng & Shipbuild Co Ltd | Simultaneous cutting apparatus of plural places |
US6705914B2 (en) * | 2000-04-18 | 2004-03-16 | Matsushita Electric Industrial Co., Ltd. | Method of forming spherical electrode surface for high intensity discharge lamp |
JP3339580B2 (ja) | 2000-04-18 | 2002-10-28 | 松下電器産業株式会社 | 高圧放電ランプの製造方法、及び高圧放電ランプ用電極の製造方法 |
JP3589651B2 (ja) | 2002-01-08 | 2004-11-17 | 松下電器産業株式会社 | 高圧放電ランプ |
JP2007188802A (ja) | 2006-01-16 | 2007-07-26 | Iwasaki Electric Co Ltd | 高圧放電ランプ |
DE102006033872A1 (de) * | 2006-07-21 | 2008-01-24 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Dielektrisch behinderte Entladungslampe mit Glaswand |
-
2008
- 2008-09-05 US US13/062,675 patent/US8502439B2/en not_active Expired - Fee Related
- 2008-09-05 DE DE112008003969.0T patent/DE112008003969B4/de not_active Expired - Fee Related
- 2008-09-05 CN CN200880131025.8A patent/CN102144276B/zh not_active Expired - Fee Related
- 2008-09-05 WO PCT/EP2008/061728 patent/WO2010025769A1/de active Application Filing
- 2008-09-05 JP JP2011525412A patent/JP2012502412A/ja active Pending
-
2009
- 2009-09-03 TW TW98129640A patent/TWI467628B/zh not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5743352A (en) * | 1980-08-27 | 1982-03-11 | Toshiba Corp | Metal halide lamp |
US4950954A (en) * | 1988-12-07 | 1990-08-21 | Gte Products Corporation | Metal halide discharge lamp with electrodes having unequal thoria contents |
EP1763065A2 (de) * | 1999-02-10 | 2007-03-14 | Matsushita Electric Industrial Co., Ltd. | Elektrode für Hochdruck-Entladungslampe, Verfahren zur Herstellung der Elektrode und Verwendung der Lampe in einem Projektionsapparat |
US20030020394A1 (en) * | 2000-05-12 | 2003-01-30 | Yoshiki Kitahara | High pressure discharge lamp with long life |
US20070182332A1 (en) * | 2003-05-26 | 2007-08-09 | Koninklijke Philips Electronics N.V. | Thorium-free electrode with improved color stability |
US20060208635A1 (en) * | 2005-03-15 | 2006-09-21 | Lenef Alan L | Slotted electrode for high intensity discharge lamp |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012063151A1 (en) * | 2010-11-10 | 2012-05-18 | Koninklijke Philips Electronics N.V. | Method of manufacturing an electrode for a gas discharge lamp. |
US9053922B2 (en) | 2010-11-10 | 2015-06-09 | Koninklijke Philips N.V. | Method of manufacturing an electrode for a gas discharge lamp |
DE102011075899A1 (de) * | 2011-05-16 | 2012-11-22 | Osram Ag | Gasentladungslampe und Elektrode für eine Gasentladungslampe |
WO2012156161A1 (de) * | 2011-05-16 | 2012-11-22 | Osram Ag | Gasentladungslampe und elektrode für eine gasentladungslampe |
Also Published As
Publication number | Publication date |
---|---|
US20110163655A1 (en) | 2011-07-07 |
CN102144276B (zh) | 2014-05-14 |
TW201015610A (en) | 2010-04-16 |
CN102144276A (zh) | 2011-08-03 |
DE112008003969B4 (de) | 2017-11-09 |
JP2012502412A (ja) | 2012-01-26 |
DE112008003969A5 (de) | 2011-07-14 |
US8502439B2 (en) | 2013-08-06 |
TWI467628B (zh) | 2015-01-01 |
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