EP2198450B1 - Lampe a decharge - Google Patents

Lampe a decharge Download PDF

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Publication number
EP2198450B1
EP2198450B1 EP07821075.4A EP07821075A EP2198450B1 EP 2198450 B1 EP2198450 B1 EP 2198450B1 EP 07821075 A EP07821075 A EP 07821075A EP 2198450 B1 EP2198450 B1 EP 2198450B1
Authority
EP
European Patent Office
Prior art keywords
anode
discharge vessel
discharge
discharge lamp
lamp 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.)
Active
Application number
EP07821075.4A
Other languages
German (de)
English (en)
Other versions
EP2198450A1 (fr
Inventor
Gerhard Löffler
Dirk Rosenthal
Swen-Uwe Baacke
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 EP2198450A1 publication Critical patent/EP2198450A1/fr
Application granted granted Critical
Publication of EP2198450B1 publication Critical patent/EP2198450B1/fr
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Anticipated expiration legal-status Critical

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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
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/16—Selection of substances for gas fillings; Specified operating pressure or temperature having helium, argon, neon, krypton, or xenon as the principle constituent
    • 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 discharge lamp according to the preamble of claim 1.
  • Discharge lamps in particular XBO® high-pressure discharge lamps, have an ellipsoidal lamp bulb which encloses an anode and a cathode.
  • the useful life of such discharge lamps is determined, inter alia, by the blackening of the lamp bulb during operation, which leads to a considerable loss of usable light.
  • the blackening has different causes. One of them is the evaporation of anode material due to the high temperatures in the operation of the high pressure discharge lamp, which is deposited on the inner surface of the lamp envelope.
  • Another cause of the blackening are contaminants of the gas filling in the lamp envelope, for example atmospheric residues, such as oxygen and moisture, which can only be removed in the production of the high-pressure discharge lamp with great expenditure of time and money.
  • the document US 2003/151364 A1 discloses a discharge lamp having a substantially ellipsoidal discharge vessel enclosing an anode and a cathode.
  • Anode and cathode are each fixed by current-carrying, rod-shaped electrode holders, which are guided in diametrically arranged on the discharge vessel KolbenSften.
  • a holding cylinder is arranged, through which the respective rod-shaped electrode holder passes and is thereby held by the holding cylinder.
  • the holding cylinders In order to prevent slippage of the holding cylinders in the respective piston shaft, the holding cylinders each have at least one area of reduced diameter; as well as the piston shafts in their holding cylinder enveloping areas. This is to transport damage due to excessive forces on the sealing areas, in which the rod-shaped electrode holders are passed through the piston shafts gas-tight, can be avoided.
  • the object of the present invention is to provide a high-pressure discharge lamp which has a long service life at substantially constant light intensity.
  • the discharge lamp according to the invention has a substantially ellipsoidal discharge vessel, which encloses an anode and a cathode, which are fixed in each case by current-carrying electrode holders, wherein these are passed in diametrically arranged on the discharge vessel piston shafts, wherein at the transition from the discharge vessel to the KolbenSften constrictions around the electrode holders
  • the discharge vessel, the constrictions and / or the anode coating are designed such that a blackening of the discharge vessel in the light-emitting region is reduced or avoided, which form a connecting channel between the discharge space enclosed by the discharge vessel and the piston skirt spaces enclosed by the piston shafts is.
  • the discharge vessel essentially has a cylindrical cooling section between a side of the anode facing away from the cathode and a constriction. This has the advantage that, for example vaporized anode material can accumulate in this area and thus the discharge vessel blackens outside of the optically usable range.
  • the cylindrical cooling section has a diameter which is greater than the diameter of the cylindrical anode.
  • the cylindrical cooling section may have a length that corresponds to substantially half the length of the anode. As a result, a sufficiently large cooling section for depositing, for example, the vaporized anode material is made possible.
  • the anode is coated with a radiation enhancing coating, preferably a tungsten paste.
  • a radiation enhancing coating preferably a tungsten paste.
  • connection channels can be designed such that they ensure the relative position of the electrode holders with minimal pumping resistance in the manufacturing process, whereby a simpler and more cost-effective pumping of atmospheric residues is made possible.
  • connection channel The diameter and / or the length of the connection channel can be minimized in order to advantageously achieve the lowest pumping resistance.
  • transition region between the constrictions and the piston stems and in the transition region between the constrictions and the discharge vessel can be formed with respect to the electrode holders inclined walls.
  • the discharge vessel has a cylindrical section approximately between a side of the cathode facing away from the anode and the constriction, whereby a mechanically stable transition from the discharge vessel to the constriction can be implemented.
  • a pump tube is preferably formed.
  • FIG. 1 shows a longitudinal section through a discharge lamp according to one embodiment.
  • the figure shows a schematic representation of a two-sided socketed XBO® high-pressure discharge lamp. 1 in short sheet technology.
  • This has a discharge vessel 4 made of quartz glass with a discharge space 6 and two diametrically arranged on the discharge vessel 4, sealed Kolben2020ften 8, 10, the free end portions each with a base sleeve, which is not shown, can be provided.
  • a gas discharge In the discharge space 6 protrude two in the piston stems 8, 10 extending electrodes 14, 16, between which occurs during lamp operation, a gas discharge.
  • an ionizable filling is included, which consists essentially of high purity xenon.
  • the electrodes 14, 16 are in the illustrated embodiment in each case as a two-part electrode system with a current-supplying, rod-shaped electrode holder 18, 20 and one, soldered to this discharge-side head electrode 22 (anode) and head electrode 24 (cathode).
  • the right electrode head 24 is designed to generate high temperatures as a conical cathode 24 and cathode, respectively, to ensure a defined arc approach and a sufficient electron flow due to thermal emission and field emission (Richardson equation).
  • the electrode head 22 is designed as a thermally highly loaded, barrel-shaped head anode 22 and anode, in which the radiation power is improved by a sufficient dimensioning of the electrode size.
  • the surface of the head anode 22 is coated with a coating 25, preferably with a tungsten paste, whereby the head anode 22 has a higher emission coefficient of 0.55 and thereby one approximately 40% higher emission compared to the prior art, where the emission coefficient is 0.4.
  • the rod-shaped electrode holders 18, 20 each have two bearing points. One bearing point is in each case one at the ends of the piston shafts 8, 10 formed current feedthrough system 26, 28 and the other bearing point is in the transition region between the discharge vessel 4 and the Kolben2020ften 8, 10 arranged constriction 30, 32.
  • the current feedthrough systems 26, 28 store the electrode holders 18, 20 each in the radial and axial directions and are sealed airtight to the environment, so that no air from the outside can penetrate into the piston skirt spaces 34, 36 enclosed by the piston shafts 8, 10. These are connected to the discharge space 6 of the discharge vessel 4 via connecting channels 38, 40 which are delimited by a cylindrical inner wall 42, 44 of the constrictions 30, 32 and the electrode holders 18, 20.
  • connection channels 38, 40 measured from the inner walls 42, 44 to the surfaces of the electrode holders 18, 20 is on average about 0.4 to 0.5 mm and is substantially higher than in the prior art where this height corresponds to 0.1 to 0.2 mm.
  • the axial length of the connection channels 38, 40 is approximately 1.5 times the cross section of the electrode holders 18, 20.
  • the constrictions 30, 32 have the same wall thickness as the piston shafts 8, 10 and are limited by inclined walls 46 in the transition region to the discharge vessel 4 and the piston shafts 8, 10.
  • the axial length of the constrictions 30, 32 is minimized and the radial height of the connecting channels 38, 40 maximized, so that these dimensions are just sufficient for securing the radial position of the electrode holders 18, 20.
  • the discharge vessel 4 has approximately between the side facing away from the cathode head 24 shadow side 48 of the head anode 22 and in the figure right wall 46 of the left constriction 30 has a substantially cylindrical cooling portion 50, whose diameter is slightly larger than the diameter of the head anode 22 and its axial length corresponds to about half the axial length of the head anode 22.
  • a pumping channel 52 Radially on the outer circumference of the cooling section 50, a pumping channel 52 is arranged in the figure, which is used in the manufacturing process of the high-pressure discharge lamp 1 described below and can be removed after manufacture.
  • Another cylindrical portion 54 is formed at the opposite end to the cooling portion 50 of the discharge vessel 4, which has a substantially shorter axial length.
  • the high-pressure discharge lamp 1 has an optical useful region 55, which is characterized by four dashed-dotted lines, wherein in operation the light is radiated essentially over this useful region 55.
  • the use of a high-pressure discharge lamp after a certain period of operation produces a blackening on the inner wall of the discharge vessel, which becomes stronger and darker with increasing operating time.
  • This blackening is in an optical useful range and thus reduces the usable light of the high-pressure discharge lamp until it can no longer be used is.
  • One cause of the blackening are the high temperatures of the anode during lamp operation, which lead to evaporation of the anode material, which then deposits on the inner wall of the discharge vessel.
  • Another cause are contamination of the filling of the discharge vessel with, for example, oxygen and moisture, which also deposit in the form of a blackening.
  • a blackening 56 in contrast to the prior art, advantageously lies outside the optical useful region 55, essentially on the piston inner surface 58 of the discharge vessel 4 in the region of the cooling section 50, in the transitional region between the cooling section 50 and the remaining discharge vessel 4, and on the wall 46 between the cooling section 50 and the constriction 30, which is illustrated by a black coloring of the discharge vessel 4 in the figure.
  • the blackening 56 is much lower compared to the prior art with the same operating time. The reasons for this are explained below.
  • gas still present in the discharge vessel 4 for example air
  • gas still present in the discharge vessel 4 is pumped as far as possible via the pumping channel 52 out of the discharge space 6 and via the connecting channels 38, 40 from the piston skirting spaces 34, 36.
  • the discharge vessel 4 is filled with an ionizable filling and sealed airtight.
  • the connecting channels 38, 40 in this case afford the largest pumping resistance in the high-pressure discharge lamp 1 due to their dimensioning.
  • the connecting channels 38, 40 are dimensioned in such a way that they are one maximum height at minimum axial length in order to minimize the pumping resistance, while still sufficient radial support of the electrode holder 18, 20 is ensured.

Landscapes

  • Discharge Lamp (AREA)

Claims (8)

  1. Lampe de décharge comprenant une enceinte de décharge sensiblement ellipsoïdale (4) qui enferme une anode (22) et une cathode (24) qui sont fixées respectivement par des fixations d'électrodes en forme de barres conductrices de courant (18, 20), celles-ci traversant des tiges de piston (8, 10) agencées diamétralement au niveau de l'enceinte de décharge (4), au niveau de la jonction entre l'enceinte de décharge (4) et les tiges de piston (8, 10) étant prévus des étranglements (30, 32) autour des fixations d'électrodes en forme de barres (18, 20), lesquelles forment un canal de liaison (38, 40) entre l'espace de décharge (6) entouré par l'enceinte de décharge (4) et les espaces de tige de piston respectifs (34, 36) entourés par les tiges de piston (8, 10), caractérisée en ce que l'enceinte de décharge (4), les étranglements (30, 32) et/ou le revêtement d'anode sont réalisés de manière telle qu'un noircissement (56) de l'enceinte de décharge est réduit resp. évité dans la zone émettrice de lumière (55), l'enceinte de décharge (4) présentant une partie de refroidissement cylindrique (50) sensiblement entre un côté (48) de l'anode opposé à la cathode (24) et un étranglement (30), et la partie de refroidissement cylindrique (50) présentant un diamètre qui est supérieur au diamètre de l'anode cylindrique (22).
  2. Lampe de décharge selon la revendication 1, la partie de refroidissement cylindrique (50) présentant une longueur qui correspond sensiblement à la demi-longueur de l'anode (22).
  3. Lampe de décharge selon l'une des revendications précédentes, l'anode (22) étant revêtue d'un revêtement (25) améliorant le rayonnement, et plus particulièrement d'une pâte de tungstène.
  4. Lampe de décharge selon l'une des revendications précédentes, les canaux de liaison (38, 40) étant réalisés de manière à garantir la position relative de la fixation d'électrode (18, 20), la résistance au pompage dans le procédé de fabrication étant minimale.
  5. Lampe de décharge selon la revendication 4, le diamètre et/ou la longueur des canaux de liaison (38, 40) étant minimisés.
  6. Lampe de décharge selon l'une des revendications précédentes, des parois (46) inclinées par rapport aux fixations d'électrodes étant réalisées dans la zone de jonction entre les étranglements (30, 32) et les tiges de piston (8, 10) et dans la zone de jonction entre les étranglements (30, 32) et l'enceinte de décharge (4).
  7. Lampe de décharge selon l'une des revendications précédentes, l'enceinte de décharge (4) présentant une partie cylindrique (54) sensiblement entre un côté de la cathode (24) opposé à l'anode (22) et l'étranglement (32).
  8. Lampe de décharge selon la revendication 1 à 7, un canal de pompage (52) étant réalisé sur la partie de refroidissement (50).
EP07821075.4A 2007-10-09 2007-10-09 Lampe a decharge Active EP2198450B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/060706 WO2009049660A1 (fr) 2007-10-09 2007-10-09 Lampe à décharge

Publications (2)

Publication Number Publication Date
EP2198450A1 EP2198450A1 (fr) 2010-06-23
EP2198450B1 true EP2198450B1 (fr) 2017-12-06

Family

ID=39561835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07821075.4A Active EP2198450B1 (fr) 2007-10-09 2007-10-09 Lampe a decharge

Country Status (5)

Country Link
US (1) US8264148B2 (fr)
EP (1) EP2198450B1 (fr)
KR (1) KR101084441B1 (fr)
CN (1) CN101821831B (fr)
WO (1) WO2009049660A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7716087B1 (en) 2009-06-04 2010-05-11 Yung Yeung Methods and system of conducting business-to-business operations by registered sellers and buyers using an internet accessible platform
US7657464B1 (en) 2009-06-04 2010-02-02 Yung Yeung System and methods of conducting business-to-business operations by registered sellers and buyers using an internet accessible platform
JP5918811B2 (ja) * 2014-07-12 2016-05-18 フェニックス電機株式会社 高圧放電ランプの製造方法、および高圧放電ランプの封止構造
JP6831224B2 (ja) * 2016-12-07 2021-02-17 株式会社オーク製作所 放電ランプ
JP7276662B2 (ja) * 2019-12-24 2023-05-18 ウシオ電機株式会社 ショートアーク型放電ランプ

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250941A (en) 1963-03-01 1966-05-10 Gen Electric Discharge lamp manufacture
KR20030019167A (ko) * 2001-08-30 2003-03-06 마쯔시다덴기산교 가부시키가이샤 고압방전 램프 및 그 제조방법
JP3858718B2 (ja) * 2002-02-13 2006-12-20 ウシオ電機株式会社 ショートアーク放電ランプ
DE10209426A1 (de) 2002-03-05 2003-09-18 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Kurzbogen-Hochdruckentladungslampe
JP2004178894A (ja) * 2002-11-26 2004-06-24 Ushio Inc ショートアーク型放電ランプ

Also Published As

Publication number Publication date
WO2009049660A1 (fr) 2009-04-23
CN101821831A (zh) 2010-09-01
CN101821831B (zh) 2012-09-19
KR20100084536A (ko) 2010-07-26
US20110260597A1 (en) 2011-10-27
EP2198450A1 (fr) 2010-06-23
KR101084441B1 (ko) 2011-11-21
US8264148B2 (en) 2012-09-11

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