WO2003056607A1 - METHOD OF MANUFACTURING A FOIL OF MOLYBDENUM AND TITANIUM OXIDE (TiO2) FOR SEALING INTO A GLASS BULB - Google Patents

METHOD OF MANUFACTURING A FOIL OF MOLYBDENUM AND TITANIUM OXIDE (TiO2) FOR SEALING INTO A GLASS BULB Download PDF

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Publication number
WO2003056607A1
WO2003056607A1 PCT/IB2002/005478 IB0205478W WO03056607A1 WO 2003056607 A1 WO2003056607 A1 WO 2003056607A1 IB 0205478 W IB0205478 W IB 0205478W WO 03056607 A1 WO03056607 A1 WO 03056607A1
Authority
WO
WIPO (PCT)
Prior art keywords
foil
molybdenum
titanium oxide
discharge lamp
glass bulb
Prior art date
Application number
PCT/IB2002/005478
Other languages
French (fr)
Inventor
Jozef Merx
Original Assignee
Philips Intellectual Property & Standards Gmbh
Koninklijke Philips Electronics N.V.
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 Philips Intellectual Property & Standards Gmbh, Koninklijke Philips Electronics N.V. filed Critical Philips Intellectual Property & Standards Gmbh
Priority to AU2002367226A priority Critical patent/AU2002367226A1/en
Publication of WO2003056607A1 publication Critical patent/WO2003056607A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/38—Seals for leading-in conductors
    • 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
    • H01J61/368—Pinched seals or analogous seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/32—Sealing leading-in conductors
    • H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device
    • H01J9/326—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device making pinched-stem or analogous seals

Definitions

  • the invention relates to a method of manufacturing a foil of molybdenum and titanium oxide (TiO 2 ) and a foil of molybdenum and an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, thorium, chromium, aluminum, boron, and silicon for sealing into a glass bulb and for interconnecting electrically conductive leads of a discharge lamp.
  • TiO 2 titanium oxide
  • Such a molybdenum foil for a high-pressure gas discharge lamp is described in WO 96/34405.
  • the high-pressure gas discharge lamp is used as a light source in a headlight of a motor vehicle.
  • the molybdenum foil is electrically conductive, connects an external to an internal electrically conductive lead of the gas discharge lamp, and seals off the interior of the gas discharge lamp from the outer surroundings.
  • the molybdenum foil is exposed to mechanical stresses and is sensitive to attacks by metal halides, which are used as filling salts. This would lead to a crack in the quartz glass, the so-termed foil crack.
  • the molybdenum foil comprises an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, titanium, tantalum, niobium, thorium, chromium, aluminum, and boron. Mixing of the molybdenum foil with the oxide, also denoted dopant, is elaborate.
  • GB 2045741 discloses how the molybdenum foil is oxidized at its surface during processing.
  • the invention has for its object to improve the lamp and to increase lamp life.
  • the molybdenum foil is coated with an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, titanium, thorium, chromium, aluminum, boron, and silicon.
  • Coating with an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, titanium, thorium, chromium, aluminum, boron, and silicon ensures that an adhesion is achieved between the molybdenum foil, the oxide coating, and the quartz glass in the subsequent pinching operation and the accompanying heating of the quartz glass.
  • An adhesion between the molybdenum and the quartz is clearly improved by the oxide coating.
  • a coating with silicon dioxide, i.e. quartz may also be used. The adhesion is particularly strongly improved if the coating is a titanium oxide coating. A premature foil crack is avoided thereby, and lamp life is prolonged.
  • the molybdenum foil is brought into contact with reactive substances, denoted precursors, which comprise titanium and oxygen molecules (Ti and 0 2 molecules).
  • precursors which comprise titanium and oxygen molecules (Ti and 0 2 molecules).
  • CND chemical vapor deposition
  • a solid TiO 2 layer is formed on the foil surface by external activation.
  • the molybdenum foil is exposed to titanium oxide molecules in an Ar atmosphere.
  • the molybdenum foil is laid next to a target object in an Ar atmosphere in physical vapor deposition, or PND for short, and the target is bombarded with argon ions, Ar ions for short.
  • a potential applied to the target ensures that the Ar ions will hit the target.
  • the target releases titanium oxide molecules under bombardment by the argon ions, which molecules will deposit on the molybdenum foil.
  • the coating has a thickness of 1 nm to 1000 nm, in particular 2.5 nm to 500 nm, advantageously 5 nm to 25 nm. It is ensured thereby that a perfect adhesion is achieved in the pinch.
  • the titanium oxide coating achieves a durable bond between the quartz glass, the titanium oxide coating, and the molybdenum foil.
  • the foil is advantageously used for insertion in a high-pressure gas discharge lamp which serves as a light source in a headlight of a motor vehicle and which generates a low beam or a high beam.
  • Fig. 1 shows a high-pressure gas discharge lamp in cross-section
  • Fig. 2 shows the region of a pinch of a glass cylinder of the gas discharge lamp in cross-section
  • Fig. 1 shows a high-pressure gas discharge lamp 1 with a lamp cap 2 and a glass bulb 3 designed for a motor vehicle.
  • the glass bulb 3 has an inner space 4 which is filled with a gas and with salts.
  • Two electrically conductive leads 5 and 6 project into this inner space.
  • Further electrically conductive leads 7 and 8 project from the glass bulb to the exterior.
  • a rectangular molybdenum foil 9, 10 is arranged between each of the leads 5 and 6 and a respective one of the leads 6 and 8, sealing off the inner space of the glass bulb from the outer surroundings.
  • the molybdenum foil 9, 10 has a coating of titanium oxide.
  • Fig. 2 shows the molybdenum foil 9 embedded in the pinch of the glass bulb 3.
  • the titanium oxide coating forms a connection between the quartz glass of the glass bulb 3 and the molybdenum of the foil 9, 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

The invention relates to a method of manufacturing a foil (9, 10) from molybdenum and titanium oxide (TiO2) for insertion into a glass bulb (3) and for the interconnection of electrically conductive leads in a discharge lamp (1). According to the invention, a foil (9, 10) of molybdenum is coated with titanium oxide (TiO2).

Description

Method of manufacturing a foil of molybdenum and titanium oxide (TiO2) for sealing into a glass bulb
The invention relates to a method of manufacturing a foil of molybdenum and titanium oxide (TiO2) and a foil of molybdenum and an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, thorium, chromium, aluminum, boron, and silicon for sealing into a glass bulb and for interconnecting electrically conductive leads of a discharge lamp.
Such a molybdenum foil for a high-pressure gas discharge lamp is described in WO 96/34405. The high-pressure gas discharge lamp is used as a light source in a headlight of a motor vehicle. The molybdenum foil is electrically conductive, connects an external to an internal electrically conductive lead of the gas discharge lamp, and seals off the interior of the gas discharge lamp from the outer surroundings. The molybdenum foil is exposed to mechanical stresses and is sensitive to attacks by metal halides, which are used as filling salts. This would lead to a crack in the quartz glass, the so-termed foil crack. To avoid a foil crack, the molybdenum foil comprises an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, titanium, tantalum, niobium, thorium, chromium, aluminum, and boron. Mixing of the molybdenum foil with the oxide, also denoted dopant, is elaborate.
GB 2045741 discloses how the molybdenum foil is oxidized at its surface during processing. The invention has for its object to improve the lamp and to increase lamp life.
In particular, a simple manufacturing method is to be provided for the molybdenum foil and an oxide.
The object is achieved by the characterizing features of the parallel claims 1 and 2. According to the invention, the molybdenum foil is coated with an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, titanium, thorium, chromium, aluminum, boron, and silicon. Coating with an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, titanium, thorium, chromium, aluminum, boron, and silicon ensures that an adhesion is achieved between the molybdenum foil, the oxide coating, and the quartz glass in the subsequent pinching operation and the accompanying heating of the quartz glass. An adhesion between the molybdenum and the quartz is clearly improved by the oxide coating. Advantageously, moreover, a coating with silicon dioxide, i.e. quartz, may also be used. The adhesion is particularly strongly improved if the coating is a titanium oxide coating. A premature foil crack is avoided thereby, and lamp life is prolonged.
Advantageously, the molybdenum foil is brought into contact with reactive substances, denoted precursors, which comprise titanium and oxygen molecules (Ti and 02 molecules). In this chemical coating method, denoted chemical vapor deposition or CND for short, a solid TiO2 layer is formed on the foil surface by external activation.
Advantageously, the molybdenum foil is exposed to titanium oxide molecules in an Ar atmosphere. The molybdenum foil is laid next to a target object in an Ar atmosphere in physical vapor deposition, or PND for short, and the target is bombarded with argon ions, Ar ions for short. A potential applied to the target ensures that the Ar ions will hit the target. The target releases titanium oxide molecules under bombardment by the argon ions, which molecules will deposit on the molybdenum foil.
Advantageously, the coating has a thickness of 1 nm to 1000 nm, in particular 2.5 nm to 500 nm, advantageously 5 nm to 25 nm. It is ensured thereby that a perfect adhesion is achieved in the pinch. When the glass bulb is heated and pinched at the same time, the titanium oxide coating achieves a durable bond between the quartz glass, the titanium oxide coating, and the molybdenum foil.
The foil is advantageously used for insertion in a high-pressure gas discharge lamp which serves as a light source in a headlight of a motor vehicle and which generates a low beam or a high beam. An embodiment of the invention will be explained in more detail below for better understanding with reference to the drawing, in which
Fig. 1 shows a high-pressure gas discharge lamp in cross-section, and Fig. 2 shows the region of a pinch of a glass cylinder of the gas discharge lamp in cross-section. Fig. 1 shows a high-pressure gas discharge lamp 1 with a lamp cap 2 and a glass bulb 3 designed for a motor vehicle. The glass bulb 3 has an inner space 4 which is filled with a gas and with salts. Two electrically conductive leads 5 and 6 project into this inner space. Further electrically conductive leads 7 and 8 project from the glass bulb to the exterior. A rectangular molybdenum foil 9, 10 is arranged between each of the leads 5 and 6 and a respective one of the leads 6 and 8, sealing off the inner space of the glass bulb from the outer surroundings. The molybdenum foil 9, 10 has a coating of titanium oxide.
Fig. 2 shows the molybdenum foil 9 embedded in the pinch of the glass bulb 3. The titanium oxide coating forms a connection between the quartz glass of the glass bulb 3 and the molybdenum of the foil 9, 10.
List of reference numerals
1 high-pressure gas discharge lamp
2 lamp cap
3 glass bulb
4 inner space
5 electrical conductor
6 electrical conductor
7 electrical conductor
8 electrical conductor
9 molybdenum foil
10 molybdenum foil

Claims

CLAIMS:
1. A method of manufacturing a foil (9, 10) of molybdenum and titanium oxide (TiO2) for insertion into a glass bulb (3) and for interconnecting electrically conductive leads (5 and 7, 6 and 8) of a discharge lamp (1), characterized in that a foil (9, 10) of molybdenum is coated with titanium oxide (TiO2).
2. A method of manufacturing a foil (9, 10) from molybdenum and an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, thorium, chromium, aluminum, boron, and silicon for insertion into a glass bulb (3) and for interconnecting electrically conductive leads (5 and 7, 6 and 8) of a discharge lamp (1), characterized in that a foil (9, 10) of molybdenum is coated with an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, thorium, chromium, aluminum, boron, and silicon.
3. A method as claimed in claim 1, characterized in that the molybdenum foil (9,
10) is brought into contact with reactive substances which comprise titanium and oxygen molecules (Ti and 02 molecules).
4. A method as claimed in claim 2, characterized in that the molybdenum foil (9, 10) is brought into contact with reactive substances which comprise an element from among the elements yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, thorium, chromium, aluminum, boron, and silicon, and oxygen molecules (O molecules).
5. A method as claimed in claim 1, characterized in that the molybdenum foil (9,
10) is exposed to titanium oxide molecules in an argon atmosphere (Ar atmosphere).
6. A method as claimed in claim 2, characterized in that the molybdenum foil (9,
10) is exposed to oxide molecules chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, thorium, chromium, aluminum, boron, and silicon in an argon atmosphere (Ar atmosphere).
7. A foil manufactured by a method as claimed in any one of the claims 1 to 6, characterized in that the oxide coating has a thickness of 1 nm to 1000 nm, in particular 2.5 nm to 500 nm, advantageously 5 nm to 25 nm.
8. A high-pressure gas discharge lamp with a foil manufactured by a method as claimed in one of the preceding method claims.
9. A high-pressure gas discharge lamp with a foil as claimed in claim 7.
10. A foil (9, 10) of molybdenum and titanium oxide (Ti0 ) for insertion into a glass bulb (3) and for interconnecting electrically conductive leads (5 and 1, 6 and 8) of a discharge lamp (1), characterized in that a foil (9, 10) of molybdenum is coated with titanium oxide (TiO ).
11. A foil (9, 10) of molybdenum and an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, thorium, chromium, aluminum, boron, and silicon for insertion into a glass bulb (3) and for interconnecting electrically conductive leads (5 and 1, 6 and 8) of a discharge lamp (1), characterized in that a foil (9, 10) of molybdenum is coated with an oxide chosen from the oxides of yttrium, lanthanum, the lanthanides, scandium, magnesium, calcium, strontium, barium, zirconium, hafnium, tantalum, niobium, thorium, chromium, aluminum, boron, and silicon.
PCT/IB2002/005478 2002-01-02 2002-12-18 METHOD OF MANUFACTURING A FOIL OF MOLYBDENUM AND TITANIUM OXIDE (TiO2) FOR SEALING INTO A GLASS BULB WO2003056607A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002367226A AU2002367226A1 (en) 2002-01-02 2002-12-18 METHOD OF MANUFACTURING A FOIL OF MOLYBDENUM AND TITANIUM OXIDE (TiO2) FOR SEALING INTO A GLASS BULB

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002100005 DE10200005A1 (en) 2002-01-02 2002-01-02 Process for the production of a foil from molybdenum and titanium oxide (TiO2) for insertion into a glass bulb
DE10200005.0 2002-01-02

Publications (1)

Publication Number Publication Date
WO2003056607A1 true WO2003056607A1 (en) 2003-07-10

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AU (1) AU2002367226A1 (en)
DE (1) DE10200005A1 (en)
TW (1) TW200301917A (en)
WO (1) WO2003056607A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006006109A2 (en) 2004-07-06 2006-01-19 Philips Intellectual Property & Standards Gmbh Lamp with an improved lamp behaviour
EP1538658A3 (en) * 2003-10-16 2006-11-22 A.L.M.T. Corp. Alloy for a lead member of an electric lamp, electrode structure for use in an electric lamp and automobile light bulb therewith
US8148902B2 (en) * 2008-09-16 2012-04-03 Koito Manufacturing Co., Ltd. Mercury-free arc tube for discharge lamp device and method for manufacturing the same
US8308519B2 (en) 2007-08-29 2012-11-13 Osram Ag Method for the production of a sealing region and discharge lamp produced by said method
RU2564300C2 (en) * 2013-12-11 2015-09-27 Юрий Петрович Петренко Protective coating

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3105867A (en) * 1959-09-23 1963-10-01 Philips Corp Metal foil lead-in conductor for electric lamp
US3753026A (en) * 1969-12-13 1973-08-14 Philips Corp Quartz lamp seal
JPS5038267B1 (en) * 1970-12-21 1975-12-08
WO1996034405A2 (en) * 1995-04-27 1996-10-31 Philips Electronics N.V. Capped electric lamp
EP0895275A2 (en) * 1997-07-30 1999-02-03 Matsushita Electronics Corporation Tungsten halogen lamp and method for manufacturing the same
US20010009221A1 (en) * 2000-01-19 2001-07-26 Toshiaki Anzaki Film-forming apparatus and film-forming method
JP2001236926A (en) * 2000-02-21 2001-08-31 Ushio Inc Discharge lamp
EP1156505A1 (en) * 2000-05-18 2001-11-21 PLANSEE Aktiengesellschaft Process of producing an electrical lamp

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3105867A (en) * 1959-09-23 1963-10-01 Philips Corp Metal foil lead-in conductor for electric lamp
US3753026A (en) * 1969-12-13 1973-08-14 Philips Corp Quartz lamp seal
JPS5038267B1 (en) * 1970-12-21 1975-12-08
WO1996034405A2 (en) * 1995-04-27 1996-10-31 Philips Electronics N.V. Capped electric lamp
EP0895275A2 (en) * 1997-07-30 1999-02-03 Matsushita Electronics Corporation Tungsten halogen lamp and method for manufacturing the same
US20010009221A1 (en) * 2000-01-19 2001-07-26 Toshiaki Anzaki Film-forming apparatus and film-forming method
JP2001236926A (en) * 2000-02-21 2001-08-31 Ushio Inc Discharge lamp
EP1156505A1 (en) * 2000-05-18 2001-11-21 PLANSEE Aktiengesellschaft Process of producing an electrical lamp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 25 12 April 2001 (2001-04-12) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1538658A3 (en) * 2003-10-16 2006-11-22 A.L.M.T. Corp. Alloy for a lead member of an electric lamp, electrode structure for use in an electric lamp and automobile light bulb therewith
US7345426B2 (en) 2003-10-16 2008-03-18 A.L.M.T. Corporation Alloy for a lead member of an electric lamp and electrode structure of the electric lamp
WO2006006109A2 (en) 2004-07-06 2006-01-19 Philips Intellectual Property & Standards Gmbh Lamp with an improved lamp behaviour
WO2006006109A3 (en) * 2004-07-06 2007-11-29 Philips Intellectual Property Lamp with an improved lamp behaviour
US7733026B2 (en) 2004-07-06 2010-06-08 Koninklijke Philips Electronics N.V. Lamp with an improved lamp behaviour
US8308519B2 (en) 2007-08-29 2012-11-13 Osram Ag Method for the production of a sealing region and discharge lamp produced by said method
US8148902B2 (en) * 2008-09-16 2012-04-03 Koito Manufacturing Co., Ltd. Mercury-free arc tube for discharge lamp device and method for manufacturing the same
RU2564300C2 (en) * 2013-12-11 2015-09-27 Юрий Петрович Петренко Protective coating

Also Published As

Publication number Publication date
DE10200005A1 (en) 2003-07-17
AU2002367226A1 (en) 2003-07-15
TW200301917A (en) 2003-07-16

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