EP0841687B1 - Keramisches Entladungsgefäss - Google Patents

Keramisches Entladungsgefäss Download PDF

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Publication number
EP0841687B1
EP0841687B1 EP97117480A EP97117480A EP0841687B1 EP 0841687 B1 EP0841687 B1 EP 0841687B1 EP 97117480 A EP97117480 A EP 97117480A EP 97117480 A EP97117480 A EP 97117480A EP 0841687 B1 EP0841687 B1 EP 0841687B1
Authority
EP
European Patent Office
Prior art keywords
discharge vessel
ceramic
ceramic discharge
vessel according
contour
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
Application number
EP97117480A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0841687A2 (de
EP0841687A3 (de
Inventor
Dieter Lang
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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0841687A2 publication Critical patent/EP0841687A2/de
Publication of EP0841687A3 publication Critical patent/EP0841687A3/de
Application granted granted Critical
Publication of EP0841687B1 publication Critical patent/EP0841687B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J61/30—Vessels; Containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr

Definitions

  • the invention is based on a ceramic discharge vessel according to the preamble of claim 1.
  • Ceramic discharge vessels for Metal halide lamps or high pressure sodium lamps exist usually made of aluminum oxide, which may be provided with dopants can. But also other well-known materials such as sapphire, aluminum nitride etc. can be used.
  • DE-A 31 37 076 describes elongated cylindrical or in the middle bulged discharge vessels for high pressure sodium discharge lamps, the inside diameter of the discharge volume being larger than that of the Ends is. In particular, it is recommended that the inside diameter be in height the electrode tip at least 60% of the inner diameter in the middle is.
  • a discharge vessel which consists of a straight cylindrical tube is formed, the ends with reduced diameter has.
  • the cylindrical tube can have an elliptical cross section.
  • EP-A 587 238 is a cylindrical discharge vessel with a right angle attached end faces known, in which the electrodes recessed into the ends are used.
  • Such cylindrical discharge vessels do allow a universal burning position, but its temperature distribution is also inhomogeneous, so that a very high hot spot temperature is also generated here.
  • a high temperature gradient as seen in both elongated elliptical as well as in cylindrical discharge vessels, encourages signs of corrosion on the ceramic during the life of the lamp.
  • the principle given with the use of ceramics Possibility to increase the cold spot temperature compared to quartz glass and thus to improve the lighting data with these geometries limited by the very high hot spot temperature that occurs there.
  • the hot spot temperature of the ceramic is limited to a maximum of about 1250 ° C, when lifetimes of 6,000 to 10,000 hours are aimed for.
  • the present invention describes a special "bulbous" geometry of the discharge vessel, which are almost equivalent in every burning position
  • photometric lamp data leads with elongated cylindrical or elliptical geometry. This geometry leads in particular to a reduced hot spot temperature and a very even temperature distribution.
  • the present invention is a ceramic Discharge vessel for a high-pressure discharge lamp, which has a light-emitting Filling contains.
  • the contour of the inner wall of the discharge vessel defines an internal volume V.
  • the discharge vessel has one Longitudinal axis and two ends with openings, electrical in the ends Feedthroughs are attached gastight, with two electrodes are electrically connected, which are in the internal volume in a given Face the electrode gap EA.
  • the contour of the inner wall has the following geometry:
  • the inner contour of the discharge vessel can be composed of three parts think, namely an essentially straight cylindrical one Middle part with the length L and with the inner radius R and two on it adjoining both sides, essentially hemispherical end pieces with the same radius R.
  • the basic condition is that the length of the cylindrical central part is less than or equal to its inner radius: L ⁇ R.
  • the inside diameter of the discharge vessel must be at least 2/3 of the total length of the discharge vessel. Especially preferably L ⁇ 0.8 R.
  • L and R should be chosen so that certain boundary conditions for the electrode spacing EA are observed. These define an upper and lower limit for the insertion length of the electrodes in the internal volume.
  • the total inside length of the discharge vessel must be at least 10% larger than the electrode gap EA. Otherwise the electrodes come too close to the end area and overheat the lead-through area: 2R + L ⁇ 1.1 EA.
  • the diameter (2R) of the discharge vessel must have a length of at least 80% of the electrode spacing EA, otherwise the discharge vessel is heated unnecessarily strongly in the middle by the curvature of the arc. At the same time, the diameter may have a maximum length of 150% of the electrode spacing EA, since otherwise the middle part remains too cold 1.5 EA ⁇ 2R ⁇ 0.8 EA.
  • the wall load of the discharge vessel (that is the nominal power based on the inner surface) can be set to values between 25 and 45 W / cm 2 , preferably to values between 25 and 35 W / cm 2 , and more so for small-watt lamps at 35 (for values around 20 W nominal power even up to 45 W / cm 2 ), with higher wattages rather at 25 W / cm 2 .
  • the wall load is about 10% lower than with conventional lamps according to the prior art cited above.
  • the wall load of the discharge vessel (in W / cm 2 ) for lamps with a nominal output between 35 and 250 W is dependent on the nominal output P (in W) and the sizes R and L (in each case in cm) of the discharge vessel , chosen so that 25 ⁇ P / (4 ⁇ R 2 + 2 ⁇ RL) ⁇ 35.
  • the volume V of the discharge vessel for a 35 W lamp is approx. 100 - 150 ⁇ l and increases by approx. 7 - 10 ⁇ l per watt of additional nominal power. Accordingly, it decreases with lower performance.
  • a 20 W lamp has one Discharge volume of about 35 ⁇ l.
  • the internal volume V of the discharge vessel (in ⁇ l) is selected as a function of the nominal power P (in W) using the following formula: 0.16 • P 3.5 ⁇ V ⁇ 0.32 • P 3.5 ; in particular 0.22 • P 3.5 ⁇ V ⁇ 0.32 • P 3.5 ,
  • L ⁇ 0.6 R is selected. This is particularly important for small-watt lamps, where the heat losses at the ends are highest, in relative terms.
  • the wall thickness of the discharge vessel is advantageously at least in the Center of the discharge vessel between 5 and 15% of the inner radius R.
  • Special a discharge vessel is suitable in which the wall thickness corresponds to the Ends increases and at the ends up to twice the wall thickness is in the middle.
  • the discharge vessel is usually made of aluminum oxide, which may can be doped with magnesium oxide and other oxides or from other materials such as aluminum nitride or sapphire.
  • the present invention also relates in particular to a high-pressure discharge lamp with a ceramic discharge tube as above described.
  • Separate ceramic are preferably at the ends of the discharge vessel Plug (possibly also designed as a cermet) for receiving the current feedthroughs appropriate.
  • the ends can also be integral parts of the discharge vessel.
  • the feedthroughs can be made from the known set of shapes (e.g. a pipe or pin made of niobium or molybdenum or a conductive cermet) is selected will, in particular, be designed as capillaries into which a suitable Electrode system is soldered.
  • a pipe or pin made of niobium or molybdenum or a conductive cermet e.g. a pipe or pin made of niobium or molybdenum or a conductive cermet
  • the inner contour of the discharge vessel is described here.
  • the outer contour that is less important for the present invention is then more or less predetermined by the wall thickness.
  • the outer contour is due to a uniform wall thickness specified.
  • the wall thickness is between 5% and 15% of the inner radius of the discharge vessel.
  • the Wall thickness increases in this case from typically 10% of the inner radius in the Center of the discharge vessel up to twice this value in the end area. This also prevents rapid corrosion of the ceramic during the lifespan most likely to occur in the end area.
  • an electrode system (not shown) is inserted in each of the plugs, the electrode spacing being 7.5 mm.
  • the filling contained in the discharge volume contains a mixture of the metal halides NaJ and TlJ with rare earth iodides, such as DyJ 3 , TmJ 3 and HoJ 3 , as are usually used for lamps with high wall loads. This results in an initial color temperature of 3030 ⁇ 80 K in the vertical and 2980 ⁇ 80 K in the horizontal burning position. The temperature difference between cold spot and hot spot is only 20 ° with this lamp, in contrast to 70 ° with conventional cylindrical lamps with right-angled end faces.
  • the wall load of this discharge vessel is approximately 28 W / cm 2 .
  • the internal volume of the discharge vessel is 370 ⁇ l.
  • FIG. 2 shows a discharge vessel 1 for a 35 W lamp.
  • the Length of the cylindrical middle part 2 but 1.9 mm, while the radius of the hemispherical end pieces 3 is now 2.55 mm.
  • the total length of the Internal volume is 7.0 mm.
  • the wall thickness of the discharge vessel 1 increases from the center (0.8 mm) towards the outside to a maximum of 0.95 mm.
  • the maximum outside diameter is 6.8 mm.
  • the lamp power is in further similarly constructed exemplary embodiments chosen higher.
  • the ratio for the semi-axes of the ellipsoid is: b / a ⁇ 1.25.
  • the end pieces 11 are together with the plug 12 is integrally made from a single molded ceramic part which consists of aluminum oxide. The wall thickness increases from the center where it is 0.8 mm, towards the ends continuously double.
EP97117480A 1996-11-07 1997-10-09 Keramisches Entladungsgefäss Expired - Lifetime EP0841687B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19645960A DE19645960A1 (de) 1996-11-07 1996-11-07 Keramisches Entladungsgefäß
DE19645960 1996-11-07
US08/949,523 US5936351A (en) 1996-11-07 1997-10-14 Ceramic discharge vessel

Publications (3)

Publication Number Publication Date
EP0841687A2 EP0841687A2 (de) 1998-05-13
EP0841687A3 EP0841687A3 (de) 1998-06-17
EP0841687B1 true EP0841687B1 (de) 2003-01-08

Family

ID=26031070

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97117480A Expired - Lifetime EP0841687B1 (de) 1996-11-07 1997-10-09 Keramisches Entladungsgefäss

Country Status (7)

Country Link
US (1) US5936351A (ja)
EP (1) EP0841687B1 (ja)
JP (1) JP3723676B2 (ja)
CN (1) CN1102798C (ja)
CA (1) CA2218639C (ja)
DE (1) DE19645960A1 (ja)
HU (1) HU220258B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7211954B2 (en) 2005-03-09 2007-05-01 General Electric Company Discharge tubes
US7279838B2 (en) 2005-03-09 2007-10-09 General Electric Company Discharge tubes

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EP0910866B1 (en) * 1997-04-25 2004-06-23 Koninklijke Philips Electronics N.V. High-pressure discharge lamp
JP4316699B2 (ja) 1997-07-25 2009-08-19 ハリソン東芝ライティング株式会社 高圧放電ランプおよび照明装置
US6137229A (en) * 1997-09-26 2000-10-24 Matsushita Electronics Corporation Metal halide lamp with specific dimension of the discharge tube
JP3318250B2 (ja) * 1997-12-26 2002-08-26 松下電器産業株式会社 金属蒸気放電ランプ
JP4297227B2 (ja) * 1998-07-24 2009-07-15 ハリソン東芝ライティング株式会社 高圧放電ランプおよび照明装置
US6307321B1 (en) 1999-07-14 2001-10-23 Toshiba Lighting & Technology Corporation High-pressure discharge lamp and lighting apparatus
US6731066B2 (en) * 2001-02-23 2004-05-04 Osram Sylvania Inc. Ceramic arc tube assembly
US6620272B2 (en) 2001-02-23 2003-09-16 Osram Sylvania Inc. Method of assembling a ceramic body
DE60206215T2 (de) * 2001-06-27 2006-05-04 Matsushita Electric Industrial Co., Ltd., Kadoma Metall-Halogen-Lampe
JP2003016998A (ja) * 2001-06-28 2003-01-17 Matsushita Electric Ind Co Ltd メタルハライドランプ
JP3990582B2 (ja) 2001-06-29 2007-10-17 松下電器産業株式会社 メタルハライドランプ
US6873108B2 (en) 2001-09-14 2005-03-29 Osram Sylvania Inc. Monolithic seal for a sapphire metal halide lamp
DE10231127B4 (de) * 2001-09-19 2008-09-25 Toshiba Lighting & Technology Corp. Hochdruck-Entladungslampe und Leuchtkörper
US6661173B2 (en) * 2001-09-26 2003-12-09 Osram Sylvania Inc. Quartz arc tube for a metal halide lamp and method of making same
US7034461B2 (en) * 2002-09-19 2006-04-25 Osram Sylvania Inc. Ceramic arc tube with internal ridge
US6812644B2 (en) * 2003-02-04 2004-11-02 Osram Sylvania Inc. Reduced mercury ceramic metal halide lamp
US7262553B2 (en) * 2003-06-26 2007-08-28 Matsushita Electric Industrial Co., Ltd. High efficacy metal halide lamp with configured discharge chamber
US7030543B2 (en) * 2004-02-24 2006-04-18 Osram Sylvania Inc. Reflector lamp having reduced seal temperature
US7503825B2 (en) * 2004-05-21 2009-03-17 Osram Sylvania Inc. Aluminum nitride arc discharge vessel having high total transmittance and method of making same
US20060211568A1 (en) * 2005-03-16 2006-09-21 Osram Sylvania Inc. High Total Transmittance Alumina Discharge Vessels Having Submicron Grain Size
DE102005013003A1 (de) 2005-03-21 2006-09-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Metallhalogenidlampe
US7245075B2 (en) * 2005-04-11 2007-07-17 Osram Sylvania Inc. Dimmable metal halide HID lamp with good color consistency
JP4743847B2 (ja) * 2005-05-18 2011-08-10 株式会社小糸製作所 自動車用前照灯
US7247591B2 (en) * 2005-05-26 2007-07-24 Osram Sylvania Inc. Translucent PCA ceramic, ceramic discharge vessel, and method of making
US7414366B2 (en) * 2005-06-20 2008-08-19 Osram Sylvania Inc. Single-ended discharge vessel with diverging electrodes
US7420331B2 (en) * 2005-06-24 2008-09-02 Osram Sylvania Inc. Doped dysprosia discharge vessel
US20060290285A1 (en) * 2005-06-24 2006-12-28 Osram Sylvania Inc. Rapid Warm-up Ceramic Metal Halide Lamp
US20070072762A1 (en) * 2005-09-29 2007-03-29 Osram Sylvania Inc. Method of Making Ceramic Discharge Vessels Using Stereolithography
US20070138963A1 (en) * 2005-12-19 2007-06-21 General Electric Company Ceramic arc chamber having shaped ends
JP4915909B2 (ja) * 2006-06-27 2012-04-11 パナソニック株式会社 無電極放電灯及び照明器具
US8390196B2 (en) 2007-04-20 2013-03-05 Koninklijke Philips Electronics N.V. Methal halide lamp comprising a shaped ceramic discharge vessel
EP2145347B1 (en) 2007-04-20 2011-01-05 Koninklijke Philips Electronics N.V. Metal halide lamp comprising an ionisable salt filling
US7799269B2 (en) * 2007-09-25 2010-09-21 Osram Sylvania Inc. Method of sintering AIN under a methane-containing nitrogen atmosphere
DE202008007162U1 (de) * 2008-05-28 2008-08-07 Osram Gesellschaft mit beschränkter Haftung Hochdruckentladungslampe
WO2011015246A1 (de) 2009-08-06 2011-02-10 Osram Gesellschaft mit beschränkter Haftung HOCHDRUCKENTLADUNGSLAMPE MIT KERAMISCHEM ENTLADUNGSGEFÄß
DE102009047753A1 (de) 2009-12-09 2011-06-16 Osram Gesellschaft mit beschränkter Haftung Entladungsgefäß aus Keramik für eine Hochdruckentladungslampe
CN102299040A (zh) * 2010-06-24 2011-12-28 上海亚明灯泡厂有限公司 陶瓷放电管金属卤化物灯
US9552976B2 (en) 2013-05-10 2017-01-24 General Electric Company Optimized HID arc tube geometry
CN103606510A (zh) * 2013-11-25 2014-02-26 辽宁爱华照明科技股份有限公司 一种70-100w灯具电器通用金属卤化物灯
EP2988318A1 (en) 2014-08-19 2016-02-24 Flowil International Lighting (HOLDING) B.V. Metal halide lamp with high colour rendering

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7211954B2 (en) 2005-03-09 2007-05-01 General Electric Company Discharge tubes
US7279838B2 (en) 2005-03-09 2007-10-09 General Electric Company Discharge tubes
US7327085B2 (en) 2005-03-09 2008-02-05 General Electric Company Discharge tubes

Also Published As

Publication number Publication date
JPH10144261A (ja) 1998-05-29
CA2218639A1 (en) 1998-05-07
EP0841687A2 (de) 1998-05-13
DE19645960A1 (de) 1998-05-14
US5936351A (en) 1999-08-10
JP3723676B2 (ja) 2005-12-07
CA2218639C (en) 2005-12-20
HUP9701882A3 (en) 2000-02-28
CN1182276A (zh) 1998-05-20
HUP9701882A2 (hu) 1998-06-29
HU9701882D0 (en) 1998-01-28
CN1102798C (zh) 2003-03-05
HU220258B (hu) 2001-11-28
EP0841687A3 (de) 1998-06-17

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