EP0788655A1 - Lampe a decharge a halogenure metallique a usage photo-optique - Google Patents

Lampe a decharge a halogenure metallique a usage photo-optique

Info

Publication number
EP0788655A1
EP0788655A1 EP95934051A EP95934051A EP0788655A1 EP 0788655 A1 EP0788655 A1 EP 0788655A1 EP 95934051 A EP95934051 A EP 95934051A EP 95934051 A EP95934051 A EP 95934051A EP 0788655 A1 EP0788655 A1 EP 0788655A1
Authority
EP
European Patent Office
Prior art keywords
metal halide
lamp according
range
charge lamp
filling
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
Application number
EP95934051A
Other languages
German (de)
English (en)
Other versions
EP0788655B1 (fr
Inventor
Joachim Dirks
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 EP0788655A1 publication Critical patent/EP0788655A1/fr
Application granted granted Critical
Publication of EP0788655B1 publication Critical patent/EP0788655B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • 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
    • H01J61/125—Selection of substances for gas fillings; Specified operating pressure or temperature having an halogenide as principal component

Definitions

  • the invention relates to a metal halide discharge plate according to the preamble of claim 1. It is based in particular on the German patent application P 43 27 534.6 and DE-GM 9401 436.
  • Metal halide discharge lamps of this type are predominantly installed in optical reflectors or other optical imaging systems. Your area of application is, for example, projection or light guide technology for overhead, slide, cinema and video projection or endoscopy and boroscopy. Accordingly, very short arcs (a few millimeters) and maximum luminance (on average a few 10 kcd / cm 2 ) are required at color temperatures of more than 5000 K and good to very good color rendering (Ra> 85). Typical power values are in the range between approx. 35 W and 600 W.
  • German patent application P 43 27 534.6 and DE-GM 94 01 436 disclose such a lamp with a filling which, in addition to mercury and an inert gas, also contains halogen compounds of the elements aluminum and indium.
  • the high ignition voltages required typically approx. 12 kV are disadvantageous.
  • the invention has for its object to eliminate the disadvantage mentioned and to provide a metal halide discharge lamp which has a color temperature of more than 5000 K - with very good color rendering - and a relatively low ignition voltage and which does this with as few filling components as possible.
  • the charging vessel of the metal halide discharge lamp according to the invention additionally contains the element gallium (Ga) as a further metal for the formation of metal halides.
  • the filling The amount per cm 3 of vessel volume of the element Ga is typically up to 1 mg, in particular it is in the range between 0.02 mg and 1 mg, preferably between 0.03 mg and 0.2 mg. In preliminary experiments, it had surprisingly been found that by adding Ga, the ignition voltage of the cold lamp decreases from typically 12 kV to below 8 kV.
  • the filling also contains the following further constituents: at least one inert gas, for example argon (Ar) or xenon (Xe) as ignition gas with a typical filling pressure in the range between approximately 10 kPa and 40 kPa, mercury for setting the desired internal voltage , typically in the range between 15 mg and 30 mg for burning voltages between 60 V and 90 V and one or more halogens, preferably iodine (I) and / or bromine (Br) to form metal halides.
  • at least one inert gas for example argon (Ar) or xenon (Xe) as ignition gas with a typical filling pressure in the range between approximately 10 kPa and 40 kPa
  • mercury for setting the desired internal voltage
  • halogens preferably iodine (I) and / or bromine (Br) to form metal halides.
  • Ga forms compounds with the halogen or the halogens of the filling, in particular with iodine (I), with lower electron affinity than is the case with Al and In.
  • I iodine
  • less formation of metal halide and mercury condensates was observed on the electrodes.
  • the formation of condensate on the electrodes - in contrast to long-arc lamps - is mainly made responsible for increased ignition voltages.
  • an improved reproducibility of the arc attachment at the electrode tips can be observed.
  • the vapor pressure of the gal which is more than 10 times higher than that of Inl, may also contribute to the faster formation of the arc.
  • the ignition behavior can essentially be influenced by a suitable stoichiometry of the filling components AI, In and Ga.
  • DD-PS 254 270 discloses a short arc lamp, the complex filling of which is composed essentially of the elements mercury (Hg), zinc (Zn), indium, sodium (Na), lithium (Li) and halogens. It is mentioned that In mol equivalent can be completely or partially replaced by Ga. However, this only serves to achieve good color rendering and a low color temperature (in the range between 2500 K and 4000 K). An influence of the Ga on the ignition voltage is not mentioned. In addition, this lamp is not suitable for the specified use in optical imaging systems because of the color temperature of the entire system is usually about 1000 K to 2000 K lower than that of the lamp without an optical system.
  • the color temperature can be influenced by the proportions of the filling components AI, In and Ga.
  • color temperatures between 5000 K and 30000 K, in particular between 5000 K and 15000 K, preferably between 5000 K and 11000 K, can be set. When the lamp is operated with an optical reflector, this results in higher or similar color temperatures.
  • Typical mass ratios for In to AI and Ga to AI are in the range between approx. 1.0 and 0.5 for low color temperatures and approx. 20 for high color temperatures.
  • the filling quantity per cm 3 of the discharge vessel volume of the element AI is typically in the range between 0.01 mg and 2 mg, preferably between 0.02 mg and 0.2 mg.
  • the filling amount of the In is typically in the range between 0.03 mg cm 3 and 0.5 mg / cm 3 , preferably between 0.05 mg / cm 3 and 0.3 mg / cm 3 .
  • the filling amount of the Ga is typically in the range between 0.02 mg / cm 3 and 1 mg / cm 3 , preferably between 0.03 mg / cm 3 and 0.2 mg / cm 3 .
  • Quartz glass or a transparent ceramic material for example Al2O3, is suitable as the material for the lamp bulb.
  • a discharge vessel which is closed on both sides and which, for example, is covered at one or both ends with a heat layer (for example ZrO 2).
  • a heat layer for example ZrO 2.
  • two opposing electrodes are located inside the discharge vessel.
  • the electrodes are each connected to a power supply, which are led gas-tight to the outside.
  • the internal volume of the discharge vessel is less than approximately 3 cm 3 .
  • the electrode spacing is less than approximately 10 mm, preferably between 2 mm and 6 mm. Due to these compact dimensions, the lamp is well approximated to the ideal of a point light source and thus enables a high optical efficiency of the lamp-reflector system. Typical power levels are between 150 W and 200 W.
  • the electrodes are located outside the discharge vessel, for example on the outer wall of the discharge vessel.
  • the advantage is that is prevented by corrosion of the electrodes by the filling in any case.
  • the highest power densities can be achieved in the discharge in this way.
  • the lamp is advantageously combined with a reflector to form a structural unit, as described in EP-A 459786.
  • the lamp is mounted approximately axially in the reflector.
  • the reflector is e.g. dichroic coated.
  • Figure is a schematic representation of the lamp with reflector.
  • a metal halide discharge lamp 1 with a power of 170 W and an ellipsoid-like discharge vessel 2 made of quartz glass, which is hermetically sealed at both ends with a pinch seal 3, is shown schematically.
  • the internal volume of the discharge vessel 2 is approximately 0.7 cm 3 .
  • the axially opposite electrodes 4 are 5 mm apart. They consist of an electrode shaft 5 made of tungsten, onto which a coil 6 made of tungsten is also pushed.
  • the shaft 5 is connected to external power supply lines 8 in the area of the pinch 3 via a film 7.
  • the lamp 1 is arranged approximately axially in a parabolic reflector 9, the arc that is formed between the two electrodes 4 in operation being in the focus of the paraboloid.
  • a part of the first pinch seal 3a is located directly in a central bore of the reflector 9 and is held there in a base 10 by means of cement.
  • the first power supply line 8a is connected to a screw base contact 10a.
  • the second pinch seal 3b faces the reflector opening 11.
  • the second power supply line 8b is connected in the area of the opening 11 to a cable 12 which is electrically insulated through the wall of the reflector 9 and returned to a separate contact 10b.
  • the outer surfaces of the ends 13 of the discharge vessel 2 are coated with ZrO 2 for heat accumulation purposes.
  • the filling contains 18 mg Hg and 20 kPa Ar as the base gas.
  • the charging vessel 2 contains the metal halides listed in Table 1 below.
  • the ignition voltage could be reduced from approx. 12 kV to less than 8 kV.
  • the specific arc power and the operating voltage are approximately 34 W per mm arc length or approximately 70 V. Table 2 shows the light-technical values achieved.
  • Table 1 Metal halide composition of the lamp.
  • Table 2 Light technical values achieved with the filling from Table 1.
  • Table 3 Filling variants for the lamp from FIG. 1 and the lighting values achieved thereby.
  • the color temperature Tp can be influenced by a targeted choice of the proportions of the main components Al, In, Ga of the filling, in this case In / Al and Ga / Al.

Landscapes

  • Discharge Lamp (AREA)

Abstract

Lampe à décharge à halogénure métallique à usage photo-optique, à remplissage ionisable comprenant du mercure, au moins un gaz rare, au moins un halogène, de l'aluminium (Al) et de l'indium (In) et, en plus, du gallium (Ga). Par addition de gallium, spécifiquement à une teneur comprise entre 0,02 mg/cm3 et 1 mg/cm3, on obtient une réduction de la tension d'amorçage, tout en conservant un Ra > 85 à des températures de couleur comprises, plus spécifiquement, entre 5000 K et 11000 K.
EP95934051A 1994-10-26 1995-10-10 Lampe a decharge a halogenure metallique a usage photo-optique Expired - Lifetime EP0788655B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4438294A DE4438294A1 (de) 1994-10-26 1994-10-26 Metallhalogenid-Entladungslampe für fotooptische Zwecke
DE4438294 1994-10-26
PCT/DE1995/001398 WO1996013851A1 (fr) 1994-10-26 1995-10-10 Lampe a decharge a halogenure metallique a usage photo-optique

Publications (2)

Publication Number Publication Date
EP0788655A1 true EP0788655A1 (fr) 1997-08-13
EP0788655B1 EP0788655B1 (fr) 1998-12-23

Family

ID=6531777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95934051A Expired - Lifetime EP0788655B1 (fr) 1994-10-26 1995-10-10 Lampe a decharge a halogenure metallique a usage photo-optique

Country Status (8)

Country Link
US (1) US5798612A (fr)
EP (1) EP0788655B1 (fr)
JP (1) JPH10507868A (fr)
KR (1) KR100351338B1 (fr)
CN (1) CN1089942C (fr)
CA (1) CA2201591C (fr)
DE (2) DE4438294A1 (fr)
WO (1) WO1996013851A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060255741A1 (en) * 1997-06-06 2006-11-16 Harison Toshiba Lighting Corporation Lightening device for metal halide discharge lamp
JPH11238488A (ja) * 1997-06-06 1999-08-31 Toshiba Lighting & Technology Corp メタルハライド放電ランプ、メタルハライド放電ランプ点灯装置および照明装置
US6483240B2 (en) * 2001-03-06 2002-11-19 Perkinelmer Optoelectronics, N.C., Inc Compact and stabilized arc high-pressure mercury lamp
DE50212701D1 (de) 2001-03-08 2008-10-09 Optomed Optomedical Systems Gmbh Bestrahlungsanordnung zur behandlung von akne und aknenarben
DE10123926A1 (de) * 2001-03-08 2002-09-19 Optomed Optomedical Systems Gmbh Bestrahlungsanordnung
DE10114680A1 (de) * 2001-03-23 2002-09-26 Philips Corp Intellectual Pty Hochdruck-Gasentladungslampe
US7847484B2 (en) * 2004-12-20 2010-12-07 General Electric Company Mercury-free and sodium-free compositions and radiation source incorporating same
US7486026B2 (en) * 2006-11-09 2009-02-03 General Electric Company Discharge lamp with high color temperature
CN103035473B (zh) * 2011-09-30 2016-01-20 有研稀土新材料股份有限公司 一种用于金卤灯的发光药丸

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52314B1 (fr) * 1971-05-11 1977-01-06
FR2301091A1 (fr) * 1975-02-14 1976-09-10 Central Eclairage Lab Lampe a decharge riche en radiations ultraviolettes
JPS5231583A (en) * 1975-09-05 1977-03-10 Toshiba Corp Lamp discharging metallic fumes
JPS5517919A (en) * 1978-07-24 1980-02-07 Toshiba Corp Discharge lamp
JPS5580259A (en) * 1978-12-13 1980-06-17 Japan Storage Battery Co Ltd Metal halide lamp
DD254270A1 (de) * 1984-03-13 1988-02-17 Akad Wissenschaften Ddr Kurzbogenlampe mit leuchtzusaetzen
JPS61165947A (ja) * 1985-01-17 1986-07-26 Mitsubishi Electric Corp 金属蒸気放電灯
DE58908551D1 (de) * 1988-06-03 1994-12-01 Forschungszentrum Juelich Gmbh Metallhalogenid-Entladungslampen.
KR910008156B1 (ko) * 1989-12-29 1991-10-10 원철희 메탈 할라이드 램프
US5220237A (en) * 1990-05-31 1993-06-15 Iwasaki Electric Co., Ltd. Metal halide lamp apparatus
DE4327534A1 (de) * 1993-08-16 1995-02-23 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Metallhalogenidentladungslampe für fotooptische Zwecke
DE9401436U1 (de) * 1994-01-28 1994-03-31 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 81543 München Metallhalogenidentladungslampe für Projektionszwecke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9613851A1 *

Also Published As

Publication number Publication date
KR970707570A (ko) 1997-12-01
US5798612A (en) 1998-08-25
CN1089942C (zh) 2002-08-28
DE4438294A1 (de) 1996-05-02
CN1161757A (zh) 1997-10-08
EP0788655B1 (fr) 1998-12-23
JPH10507868A (ja) 1998-07-28
CA2201591A1 (fr) 1996-05-09
DE59504652D1 (de) 1999-02-04
WO1996013851A1 (fr) 1996-05-09
CA2201591C (fr) 2002-03-05
KR100351338B1 (ko) 2002-11-18

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