EP2201594A1 - Lampe à décharge à courant continu - Google Patents

Lampe à décharge à courant continu

Info

Publication number
EP2201594A1
EP2201594A1 EP07820462A EP07820462A EP2201594A1 EP 2201594 A1 EP2201594 A1 EP 2201594A1 EP 07820462 A EP07820462 A EP 07820462A EP 07820462 A EP07820462 A EP 07820462A EP 2201594 A1 EP2201594 A1 EP 2201594A1
Authority
EP
European Patent Office
Prior art keywords
anode
discharge lamp
cathode
facing
current discharge
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.)
Ceased
Application number
EP07820462A
Other languages
German (de)
English (en)
Inventor
Swen-Uwe Baacke
Stephan Berndanner
Gerhard Löffler
Dirk Rosenthal
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
Osram GmbH
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 Osram GmbH filed Critical Osram GmbH
Publication of EP2201594A1 publication Critical patent/EP2201594A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/84—Lamps with discharge constricted by high pressure
    • H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection

Definitions

  • the invention relates to a DC discharge lamp specified in the preamble of claim 1. Art.
  • Such a direct current discharge lamp can be seen already from the prior art as known and vice holds an anode and a cathode in a predetermined distance opposite to each other within a net angeord ⁇ bef ⁇ llten with a filling gas discharge vessel.
  • an electric performance is processing can be applied to the anode and the cathode, causing the formation of a gas discharge in the region of a light ⁇ arc.
  • a disadvantage of the known DC discharge lamps is the circumstance that their service life is essentially limited by a blackening of the discharge vessel. This blackening is due to geometric variations of the cathode facing surface of the anode in the hot state during operation of the DC discharge lamp. This leads to the formation of local growth, which leads to a concentration of the approach of the arc. At this Ansatzstel ⁇ len occur very high temperatures, which lead to increased evaporation of the material of the anode. The vaporized anode material then beats off on the inside of the discharge vessel and leads to the aforementioned blackening. Presentation of the invention
  • the object of the present invention is therefore to provide a DC discharge lamp of the type mentioned, which has a reduced density of the discharge vessel and thus an increased life.
  • a DC discharge lamp, WEL che a reduced blackening of the discharge vessel, and thus an increased service life, characterized maraf ⁇ fen, that at least the distance between the anode and the cathode, the electric power, and a geometry of the anode are adapted to one another such that In the hot state of the DC discharge lamp, a region of a surface of the anode facing the cathode is able to flow.
  • At least the said parameter is selectively generates a f adoptedfahiger state of the material of the anode in the region of the cathode supplied ⁇ facing surface during operation of the direct current discharge lamp through adjustment so that occur during the operation surface deformations are automatically compensated for by subsequent flow of the material and a uniform anode plateau is guaranteed.
  • This reliably prevents the formation of local growths with the associated high temperatures, so that there is a significant reduction in the evaporation of the Anodenmate ⁇ als. Due to the self-healing ability of the anode, the DC discharge lamp has de a significantly lower density of Entladungsge ⁇ fäßes and has a correspondingly increased Le ⁇ service life.
  • the electric power and the Geomet ⁇ rie the anode are adapted to one another such that facing in the hot state of the direct current discharge lamp of the Katho ⁇ de region of the surface of the anode a fluidically dtician exceeding ICT 6 mPas and preferably from Hoechsmann ⁇ ICT least 8 mPas possesses.
  • Such a limitation of the fluidity ensures that the material of the anode during operation of the DC discharge lamp has a sufficiently high viscosity and does not macroscopically deform even under increased or frequent force effects.
  • the DC discharge lamp can thus be used, for example, also for lighting devices of motor vehicles or the like.
  • the anode facing at least in the region of the surface Ka ⁇ Thode of doped and / or undoped tungsten Due to the high evaporation temperature and the chemical resistance of tungsten, the life of the DC discharge lamp can be additionally increased.
  • tungsten In depen ⁇ dependence of the desired luminous characteristic of the direct current discharge lamp ⁇ tungsten can be provided doped and / or undo ⁇ pending. It may further be provided that in addition to the parameters of electrode spacing, electrical power and geometry of the A- node also the characteristic properties of jewei ⁇ age material of the anode are taken into account.
  • the anode it has furthermore proven to be advantageous for the anode to be rotationally symmetrical at least along a long region facing the cathode. This allows during the hot state of Gleichstromentla tion lamp, the formation of a large-scale and permanently ⁇ stably stable "melt lake" on the surface of the anode. Thus the occurrence of operating tempera tures ⁇ is above the respective vaporization temperature of the anode material is reliably avoided by the large-area and uniform approach of the arc.
  • the anode has, starting from the side facing the cathode surface of a length of at least 5 mm.
  • the anode in H concertzu ⁇ stand acts as a thermal heat storage, whereby a mog- lichte gleichschreibige temperature of the cathode facing surface is ensured.
  • A denotes the volume of the anode in mm 3 on the first 5 mm long, starting from the wall of the cathode supplied ⁇ th surface.
  • FIG. 1 is a schematic and partially sectioned soan ⁇ view of a DC discharge lamp according to an embodiment
  • Fig. 2 is a schematic diagram of a relationship between an arc temperature and a tempera ⁇ tur an anode of the DC discharge lamp shown in Fig. 1.
  • Fig. 1 shows a schematic and partially sectioned Be ⁇ tenansicht a direct current discharge lamp in the present case formed as a xenon short-arc lamp according to a ⁇ ⁇ exporting approximately example.
  • the direct current discharge lamp comprises as ⁇ with an anode 10 and a cathode 12, which within a bef ⁇ llten with xenon discharge vessel 14 in a predetermined distance r facing each other are arranged ⁇ assigned .
  • the anode 10 has a length 1 which, for example, can be selected between 15 mm and 50 mm depending on the wattage number of the DC discharge lamp.
  • connection elements 16a, 16b which are guided by gas-tight sealed shaft tubes 18a, 18b of the DC discharge lamp, with korres ⁇ ponding socket elements 20a, 20b.
  • an electrical power P can be applied to the anode 10 and the cathode 12 via the base elements 20a, 20b.
  • Both the anode 10 and the cathode 12 are rotationally symmetrical and both consist in the present embodiment of tungsten.
  • the distance r between the anode 10 and the cathode 12, the electric power P and the geometry of the anode 10 are adapted to one another in such a way that in the hot state the DC discharge lamp, a cathode 22 facing portion 22 of a surface 24 of the anode 10 is flowable.
  • the direct current discharge lamp can be designed in accordance with a predetermined electric power P off the geometric design in order ⁇ target the desired fluidity to it.
  • an optimum distance r and an optimal geometric configuration of the anode 10 and optionally the cathode 12 can be ensured taking into account the desired luminous characteristic of the DC discharge lamp.
  • An additional coating of the anode 10 or a forced lowering of the electrical power P is thus not required in contrast to the prior art.
  • the embodiment shown as a xenon short-arc lamp it is also possible to provide alternative design variants of the DC discharge lamp which are familiar to the person skilled in the art.
  • Fig. 2 shows a schematic diagram of a combination ⁇ hangs between an arc temperature and a thermal behavior of the anode 10 of the direct current discharge lamp shown in FIG. 1.
  • the corresponding to the power supply of the direct current discharge lamp arc Tempe ⁇ temperature is characterized by a quotient Q [W / mm] of the electric power P m W and the distance r in mm between the anode 10 and the cathode 12 in the hot state of the direct current discharge lamp.
  • the temperature behavior of the anode corres ⁇ ponding with the energy losses of the DC discharge lamp is by the amount of material in the region 22 of the surface 24 and thus by the volume A [mm 3 ] of the anode 10 to the first 5 mm length (1/2), starting from the Cathode 12 added turned surface 24 characterized.
  • the drawing is ⁇ th symbols, diamonds, squares and triangles correspond to the parameters Q, A different real lamps.
  • an appropriate parameter range is bounded by the two polynomial fit curves IIa and IIb in ⁇ nerraum which an optimum temperature of the surface 24 with the desired flowability of the area 22 and the associated low blackening of Entladungsge barrel 14 is ensured.
  • the upper compensation curve IIb is given by the formula:

Landscapes

  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

L'invention concerne une lampe à décharge à courant continu comportant une anode (10) et une cathode (12) qui sont disposées à une distance déterminée (r) en face l'une de l'autre à l'intérieur d'une enceinte à décharge (14) remplie de gaz, l'anode (10) et la cathode (12) étant soumises à une puissance électrique (P) pour générer une décharge dans le gaz. La distance (r) entre l'anode (10) et la cathode (12), la puissance électrique (P) et la géométrie de l'anode (10) au moins sont mutuellement adaptées de manière à ce que, lorsque la lampe à décharge à courant continu est chaude, une zone (22) d'une surface (24) de l'anode (10) orientée vers la cathode (12) est apte à l'écoulement.
EP07820462A 2007-09-21 2007-09-21 Lampe à décharge à courant continu Ceased EP2201594A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/060042 WO2009039880A1 (fr) 2007-09-21 2007-09-21 Lampe à décharge à courant continu

Publications (1)

Publication Number Publication Date
EP2201594A1 true EP2201594A1 (fr) 2010-06-30

Family

ID=39322467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07820462A Ceased EP2201594A1 (fr) 2007-09-21 2007-09-21 Lampe à décharge à courant continu

Country Status (7)

Country Link
US (1) US8120256B2 (fr)
EP (1) EP2201594A1 (fr)
JP (1) JP5187704B2 (fr)
KR (1) KR101246754B1 (fr)
CN (1) CN101802968B (fr)
CA (1) CA2700198A1 (fr)
WO (1) WO2009039880A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4229317A1 (de) * 1992-09-02 1994-03-03 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Hochdruckentladungslampe
JP2001135274A (ja) * 1999-11-01 2001-05-18 Orc Mfg Co Ltd ショートアーク型放電灯
JP3327896B2 (ja) * 2000-05-12 2002-09-24 松下電器産業株式会社 高圧放電ランプ
DE10062974A1 (de) * 2000-12-16 2002-06-20 Philips Corp Intellectual Pty Hochdruckgasentladungslampe und Verfahren zu ihrer Herstellung
DE10063938A1 (de) * 2000-12-20 2002-07-04 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Kurzbogen-Hochdruckentladungslampe für digitale Projektionstechniken
JP2004296427A (ja) * 2003-03-13 2004-10-21 Ushio Inc 超高圧水銀ランプ発光装置
JP2005216514A (ja) * 2004-01-27 2005-08-11 Ushio Inc ショートアーク型高圧放電ランプ
AT9340U1 (de) 2005-12-23 2007-08-15 Plansee Metall Gmbh Verfahren zur herstellung eines hochdichten halbzeugs oder bauteils

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2009039880A1 *

Also Published As

Publication number Publication date
CN101802968B (zh) 2012-01-11
KR20100072281A (ko) 2010-06-30
US20100219751A1 (en) 2010-09-02
US8120256B2 (en) 2012-02-21
CA2700198A1 (fr) 2009-04-02
JP5187704B2 (ja) 2013-04-24
WO2009039880A1 (fr) 2009-04-02
KR101246754B1 (ko) 2013-03-26
JP2010539660A (ja) 2010-12-16
CN101802968A (zh) 2010-08-11

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