EP2284861B1 - Compound hid electric arc tube - Google Patents

Compound hid electric arc tube Download PDF

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Publication number
EP2284861B1
EP2284861B1 EP08783509A EP08783509A EP2284861B1 EP 2284861 B1 EP2284861 B1 EP 2284861B1 EP 08783509 A EP08783509 A EP 08783509A EP 08783509 A EP08783509 A EP 08783509A EP 2284861 B1 EP2284861 B1 EP 2284861B1
Authority
EP
European Patent Office
Prior art keywords
tube
arc tube
arc
outwardly extending
quartz glass
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.)
Not-in-force
Application number
EP08783509A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2284861A1 (en
EP2284861A4 (en
Inventor
Zongjie CHEN
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.)
Yancheng Haomai Lighting Science & Technology Co
Original Assignee
Yancheng Haomali Lighting Science & Technology Co Ltd
Yancheng Haomai Lighting Science and Tech Co Ltd
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
Priority claimed from CN2008100972277A external-priority patent/CN101373698B/zh
Application filed by Yancheng Haomali Lighting Science & Technology Co Ltd, Yancheng Haomai Lighting Science and Tech Co Ltd filed Critical Yancheng Haomali Lighting Science & Technology Co Ltd
Publication of EP2284861A1 publication Critical patent/EP2284861A1/en
Publication of EP2284861A4 publication Critical patent/EP2284861A4/en
Application granted granted Critical
Publication of EP2284861B1 publication Critical patent/EP2284861B1/en
Not-in-force legal-status Critical Current
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
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H01J61/366—Seals for leading-in conductors

Definitions

  • the invention relates to arc tubes used in the lighting equipment, especially to composite High Intensity Discharge (HID) arc tubes used in HID lamps.
  • HID High Intensity Discharge
  • quartz is chosen as the material for HID arc tubes because quartz can withstand high pressure of about 200-300 times of the atmospheric pressure; on the other hand, arc tubes made of quartz is easy to be encapsulated or sealed.
  • quartz materials also have apparent disadvantages; i.e. on one hand, the dimension of the inner chamber of the quartz arc tube has uncontrollable tolerance, since the quartz arc tube is formed by molding hot melt at a high temperature by pressing outer mold against the inner chamber while blowing highly pressurized gas into the inner chamber; on the other hand, when the quartz arc tube operates at a high temperature, the color rendering property deteriorates with reduced luminous efficacy and stability, and the loss of sodium in the lamp is severe.
  • quartz arc tubes especially low power lamps used for exhibition lighting
  • PCA polycrystalline alumina
  • the replacement of quartz arc tube by ceramic arc tube improves the color consistency of metal halide lamp (MH), one reason is that the base body used to make ceramic arc tube is shaped by molding or grout molding at an ordinary temperature, so that its dimension is well controlled; and another reason is that ceramic arc tube increases the operation temperature of the tube wall.
  • MH metal halide lamp
  • Ceramic arc tube is adapted to operate in a region around the corresponding color temperature minimal value (by contrast, for quartz arc tube, such minimal value area is above the appropriate endurable operation temperature of quartz glass), especially when the filling agent is halides of sodium and rare earth element, a higher operation temperature enables the lamp to have a better color rendering property (Ra>80) and higher luminous efficacy (> 901m•W -1 ).
  • Another benefit of the structure of polycrystalline alumina is in its lifetime, the loss of sodium within the lamp is greatly reduced, ensuring that the color rendering property is more stable than conventional metal halide lamp using quartz arc tube.
  • Cib Patent No. 98115658.4 discloses a ceramic shell component of high intensity discharge lamp, which has a shell structure of PCA shell, and specially designed multi-layer structure of axially delaminated aluminum oxide-metal ceramic.
  • the terminal therein provided with multiple elements has its last element directly sintered to the corresponding feed-through wire without any sealing material, while keeping a certain thermal expansion coefficient.
  • sealing methods cannot provide long-term reliable sealing and a longer lifetime.
  • US patent US 6,313,582B1 also discloses a ceramic lamp, in which the discharge tube is made of translucent ceramic, and the tube sealing part is terminally encapsulated by means of Dy 2 O 3 -AlO 3 -SiO 2 based sealing material. It is in fact very difficult to encapsulate the electrode of such arc tube made of ceramic due to poor pressure resistance of PCA itself (it can only withstand about 3-5 times of the atmospheric pressure). In the actual state of air exhaust, it is not easy to fill metal halide balls, inject mercury, inflate various inert gases into the arc, and maintain gas sealing between the outer lead of electrode and ceramic material by filling glass solders.
  • the invention proposes a new arc tube which combines the advantages of these two materials and compensates the respective disadvantages of these two materials.
  • An obj ect of the invention is to provide a composite HID arc tube, which has a layer of translucent polycrystalline alumina applied on an arc tube manufactured by blow-molding quartz glass or Vycor quartz glass. Then the arc tube is heated at high temperature and molded, so as to form a composite HID arc tube made of fused quartz glass and translucent polycrystalline alumina, or Vycor quartz glass and translucent polycrystalline alumina.
  • Such composite HID arc tube maintains the advantages of quartz glass including ease of encapsulation or sealing, and endurance to high working pressures; while the translucent polycrystalline alumina is applied on the inner casing with grout-molding, a strict control of the dimension of the inner chamber of the arc tube is resulted, thus the working temperature of the inner wall of the arc tube is increased and sodium penetration is prevented effectively.
  • the inflation pressure in the lamp can be increased by 20%-50% of that of ceramic metal halide lamp made of ordinary polycrystalline alumina.
  • the luminous efficacy can be enhanced by about 25%, and particularly, such a composite HID arc tube can be employed to manufacture the arc tube of light source like Ultra High Pressure Mercury Discharge lamp (UHP) to effectively overcome the problem that the pressure resistance of quartz glass arc tube of UHP being reduced due to re-crystallization and devitrification of the inner wall caused by too high temperature of the inner wall, and thus results in an early failure.
  • UHP Ultra High Pressure Mercury Discharge lamp
  • a composite HID arc tube comprises a discharge tube and two outwardly extending tubes, wherein said discharge tube is a composite two-layer shell formed of an outer shell manufactured by blow-molding fused quartz glass or Vycor quartz glass, and applying a layer of translucent polycrystalline alumina on the outer shell; and said outwardly extending tubes are made of fused quartz glass or Vycor quartz glass, wherein a layer of polycrystalline alumina is applied at the ends of said outwardly extending tubes close to arc chamber.
  • the composite HID arc tube has an inner wall as well as inner walls of segments of the outwardly extending tubes close to the arc chamber of 3 ⁇ 8mm long which are uniformly applied with a layer of translucent polycrystalline alumina of a thickness of 0.2 ⁇ 0.5mm.
  • the arc chamber of the discharge tube is in the shape of olive or ellipse.
  • glass solder made of a mixture of Al 2 O 3 ,Dy 2 O 3 ,SiO 2 is used to seal a region of said outwardly extending tube applied with the layer of polycrystalline alumina, a region of said outwardly extending tube made of quartz glass is heated by coal-oxygen fire and then sealed under pressure.
  • the layer of polycrystalline alumina is applied by the following steps: an inserted body made of heat-resistant silica gel is inserted into the arc chamber of the discharge tube and the outwardly extending tube, air under a certain pressure is injected such that the inserted body made of silica gel turns into a sophisticated inner lining film; and ceramic powder slurry is injected into the gap between the inner lining film and the outer shell, wherein the ceramic powder slurry is obtained by uniformly mixing highly-pure aluminum oxide powder, a small amount of adhesive, grain generation inhibitor, and plasticizer; after grouting and molding, cures at room temperature and then performs mould unloading; then, heats under pressure at low temperature of 500°C ⁇ 600°C and pre-heats under medium temperature of 1000°C; and then a fine aluminum oxide outer mold and a sleeve of the inner lining film are applied so as to prevent quartz glass from deforming under high temperature; after being calcinated in vacuum for 3-4
  • the effects of the invention are positive and axiomatic.
  • the composite HID arc tube of the invention maintains the advantages of quartz glass of ease of molding, ease of sealing, good pressure resistance and high operating pressure, and also has the advantages of polycrystalline alumina (PCA) arc chamber of dimension regularization, high temperature resistance and good sodium penetration resistance.
  • PCA polycrystalline alumina
  • the composite HID arc tube of the invention enhances the working pressure and working temperature, prevents sodium penetration and deformation resulted from the liquid-state silicon film on the surface of the electrode, improves the stability of color rendering and luminous efficacy of HID, especially MH lamp, and extends the lifetime of the lamp.
  • Figure 1 is a schematic diagram of a composite HID arc tube of the present invention.
  • the composite HID arc tube of the invention has a discharge tube 1, electrodes 2, molybdenum leads 3, molybdenum foils 4, and molybdenum outer leads 5, wherein the electrodes 2 are arranged within an arc chamber 13 of the discharge tube 1, and the molybdenum leads 3, molybdenum foils 4 and molybdenum outer leads 5 are sequentially connected to the electrodes 2, which are respectively disposed in two outwardly extending tubes 14 at the two ends of the discharge tube 1.
  • the outer shell of the discharge tube 1 is made of blow-molded fused quartz glass or Vycor quartz glass 11, and applying a layer of translucent polycrystalline alumina 12 on the outer shell to form a composite two-layer shell.
  • Each of both sides of the arc chamber 13 of the discharge tube 1 are provided with a long and thin outwardly extending tubes 14, and a translucent polycrystalline alumina layer 12 is also applied on one end of the outwardly extending tubes 14 close to the arc chamber 13.
  • the electrode 2, the molybdenum lead 3, the molybdenum foil 4 and the molybdenum outer lead 5 are sequentially arranged in a direction away from the arc chamber 13.
  • the region of the outwardly extending tube 14 corresponding to the molybdenum lead 3 is a region applied with polycrystalline alumina 12, and the glass solder 15 mainly made of mixture of Al 2 O 3 ,Dy 2 O 3 ,SiO 2 is used for sealing.
  • the region of the outwardly extending tube 14 corresponding to the molybdenum foil 4 is a region of a single-layer glass tube which is made of quartz glass 11 heated by coal-oxygen fire and then sealed under pressure.
  • the discharge tube 1 can be filled with different kinds of metal halides, mercury or its alternatives, high purity argon, mixture gas of argon and neon, or xenon depending on its lamp type.
  • the arc chamber 13 of the discharge tube 1 is in a shape of olive or ellipse, and the inner wall of the arc chamber 13 as well as the inner wall of the 3 ⁇ 8mm long segment of the outwardly extending tube 14 close to the arc chamber 13 are uniformly applied with a layer of translucent polycrystalline alumina 12, which has a thickness of 0.2 ⁇ 0.5mm.
  • the electrode 2 is sealed a way such that a first segment and a second segment are separately sealed segment by segment.
  • the inner wall of the arc chamber 13 of the discharge tube 1 as well as the inner wall of the 3 ⁇ 8mm long segment of the outwardly extending tube 14 close to the arc chamber 13 are uniformly applied with a layer of translucent polycrystalline alumina 12.
  • an inserted body made of heat-resistant silica gel is inserted into the arc chamber 13 of the discharge tube and the outwardly extending tube 14, air under a certain pressure is then injected such that the inserted body made of silica gel turns into an sophisticated inner lining film; and then ceramic powder slurry is injected into the gap between the inner lining film and the fused quartz glass or Vycor quartz glass shell 11 of the discharge tube 1, wherein the ceramic powder slurry is obtained by uniformly mixing high pure aluminum oxide powder, a small amount of adhesive, grain generation inhibitor, and plasticizer.
  • the inner wall of the arc chamber 13 as well as the inner wall of the 3 ⁇ 8mm long segment of the outwardly extending tube 14 close to the arc chamber 13 are uniformly applied with a layer of translucent polycrystalline alumina 12.
  • a layer of translucent polycrystalline alumina 12 After grouting and molding, curing at room temperature and then mould unloading; then, heating under pressure at low temperature of 500°C ⁇ 600°C and pre-heating under medium temperature of 1000°C; and then a fine aluminum oxide outer mold and a sleeve for the inner lining film are applied so as to prevent quartz glass 11 from deforming under high temperature.
  • the article After being calcinated in vacuum for 3-4 hours under 1800°C, the article is rapidly removed from the high temperature furnace and then cooled down by strong wind, so that the quartz glass shell 11 is prevented from devitrifying.
  • the electrode 2 is sealed in a way such that a first segment and a second segment are separately sealed segment by segment.
  • a segment of both of the outwardly extending tube 14 is designated as the first segment which is about 3 ⁇ 8mm long and close to one end of the arc chamber 13; and another segment of both of the outwardly extending tube 14 is designated as the second segment which is about 10 ⁇ 20mm long and extends outwardly from the first segment.
  • the inner wall of the first segment of the outwardly extending tube 14 is also applied with a layer of translucent polycrystalline alumina 12; and sealed by glass solder 15 mainly made of mixture of Al 2 O 3 ,Dy 2 O 3 ,SiO 2 .
  • the second segment is quartz glass or improved quartz glass 11, such as Vycor quartz glass or molybdenum resistance glass; and the molybdenum foil 4 is used to seal in an uncomplimentary manner, or directly use a molybdenum bar to seal in a complimentary manner, so as to enhance the airtightness of the lamp under super high pressure such as 100 ⁇ 200atm.
  • the discharge tube 1 uses an elliptical arc tube shell 11, which is manufactured by blow-molding high pure quartz glass with a hydroxy content of no more than 10ppm.
  • the maximal diameter ⁇ of the elliptical arc tube shell 11 is 18.5mm
  • the average thickness of the wall of the elliptical arc tube shell 11 is 1.8mm
  • the thickness of the thinnest part of the wall of the elliptical arc tube shell 11 is no less than 1.5mm.
  • the layer of translucent polycrystalline alumina (PCA) 12 is applied and sintered within the elliptical arc tube shell 11.
  • the average thickness of the layer of translucent polycrystalline alumina 12 is 0.2mm, and the thickness of thickest part the layer of translucent polycrystalline alumina 12 is no more than 0.25mm.
  • the electrode 2 is made of materials of thorium and tungsten and thus has good emissive property. ScI3-CeI3-1nI3-TlI-NaI is selected as the metal halide filler of the lamp, so that the load Ws of the tube wall is about 20W/cm 2 , and the nominal power of the lamp is 150W.
  • the test results are as follows: the initial luminous efficacy is no less than 1101m/W, the average luminous efficacy is 95 1m/W, the color rendering index Ra ⁇ 85, the color temperature is 4200K, and the lifetime is 20,000 hours; the color consistency in the lifetime of the lamp is greatly improved when compared with quartz scandium sodium lamp.
  • molybdenum lead wire and molybdenum foil are used for electrically connecting the electrode, however, the invention is not limited to molybdenum, and any other suitable metal or alloy can be used alternatively.
  • the arc tube of the invention can be used to manufacture ceramic metal halide lamp, conventionally in a double-end manner or in a single-end manner.
  • both sides of the outer shell of the lamp are provided with conducting wires connecting both sides of the arc tube, and the shape of the outer shell of the lamp can be cylindrical or conical.
  • the single-end manner only one side of the outer shell of the lamp is provided with conducting wire, through which the leads of both sides of the arc tube are connected to the outside, and the shape of the outer shell of the lamp can be spherical or elliptical.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP08783509A 2008-05-05 2008-07-11 Compound hid electric arc tube Not-in-force EP2284861B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2008100972277A CN101373698B (zh) 2007-08-21 2008-05-05 复合式hid电弧管
PCT/CN2008/001304 WO2009135345A1 (zh) 2008-05-05 2008-07-11 复合式hid电弧管

Publications (3)

Publication Number Publication Date
EP2284861A1 EP2284861A1 (en) 2011-02-16
EP2284861A4 EP2284861A4 (en) 2011-10-26
EP2284861B1 true EP2284861B1 (en) 2012-10-31

Family

ID=41266645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08783509A Not-in-force EP2284861B1 (en) 2008-05-05 2008-07-11 Compound hid electric arc tube

Country Status (4)

Country Link
EP (1) EP2284861B1 (ko)
JP (1) JP5281151B2 (ko)
KR (1) KR101430289B1 (ko)
WO (1) WO2009135345A1 (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6324298B1 (en) 1998-07-15 2001-11-27 August Technology Corp. Automated wafer defect inspection system and a process of performing such inspection

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1187100A (en) * 1967-10-12 1970-04-08 Gen Electric & English Elect Improvements in or relating to Electric Discharge Lamps.
JPS5494776A (en) * 1978-01-11 1979-07-26 Toshiba Corp Metallic vapor discharge lamp
ES2150433T3 (es) * 1992-09-08 2000-12-01 Koninkl Philips Electronics Nv Lampara de descarga de alta presion.
US5598063A (en) * 1992-12-16 1997-01-28 General Electric Company Means for supporting and sealing the lead structure of a lamp
JPH07134971A (ja) * 1993-11-10 1995-05-23 Matsushita Electric Ind Co Ltd メタルハライドランプ
EP0704880A3 (en) * 1994-09-28 1998-09-30 Matsushita Electric Industrial Co., Ltd. High-pressure discharge lamp, method for manufacturing a discharge tube body for high-pressure discharge lamps and method for manufacturing a hollow tube body
JP3153449B2 (ja) * 1994-09-28 2001-04-09 松下電器産業株式会社 高圧放電ランプ、及び高圧放電ランプ用の放電管体の製造方法と、中空管体の製造方法
JPH09120795A (ja) * 1995-10-25 1997-05-06 Matsushita Electric Works Ltd 金属蒸気放電灯及びその製造方法
JPH09283014A (ja) * 1996-02-14 1997-10-31 Toshiba Lighting & Technol Corp 直流点灯形放電ランプ、直流点灯形放電ランプ点灯装置、投光装置およびプロジェクタ装置
JP3648905B2 (ja) * 1997-01-24 2005-05-18 岩崎電気株式会社 水銀蒸気放電灯
JP3397145B2 (ja) 1998-09-18 2003-04-14 ウシオ電機株式会社 セラミック製ランプ
JP4380008B2 (ja) * 2000-03-27 2009-12-09 日本碍子株式会社 高輝度放電灯用発光管の製造方法
JP2002157974A (ja) * 2000-09-11 2002-05-31 Ushio Inc ショートアーク型カドミウムランプ
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JP2004055226A (ja) * 2002-07-17 2004-02-19 Ushio Inc ショートアーク型超高圧放電ランプおよび光源装置
JP2004355888A (ja) * 2003-05-28 2004-12-16 Ngk Insulators Ltd 接合体、発光容器および高圧放電灯用組み立て体
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Also Published As

Publication number Publication date
JP2011520225A (ja) 2011-07-14
EP2284861A1 (en) 2011-02-16
KR101430289B1 (ko) 2014-08-14
KR20110021846A (ko) 2011-03-04
JP5281151B2 (ja) 2013-09-04
EP2284861A4 (en) 2011-10-26
WO2009135345A1 (zh) 2009-11-12

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