EP1812951A1 - Tube fluorescent à cathode froide - Google Patents

Tube fluorescent à cathode froide

Info

Publication number
EP1812951A1
EP1812951A1 EP05803084A EP05803084A EP1812951A1 EP 1812951 A1 EP1812951 A1 EP 1812951A1 EP 05803084 A EP05803084 A EP 05803084A EP 05803084 A EP05803084 A EP 05803084A EP 1812951 A1 EP1812951 A1 EP 1812951A1
Authority
EP
European Patent Office
Prior art keywords
fluorescent lamp
cold cathode
sleeve
cathode fluorescent
potty
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.)
Withdrawn
Application number
EP05803084A
Other languages
German (de)
English (en)
Inventor
Andre Dronhofer
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.)
Plansee SE
Original Assignee
Plansee SE
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 Plansee SE filed Critical Plansee SE
Publication of EP1812951A1 publication Critical patent/EP1812951A1/fr
Withdrawn legal-status Critical Current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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
    • 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
    • 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
    • H01J61/09—Hollow cathodes
    • 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

Definitions

  • the invention relates to a cold cathode fluorescent lamp which essentially comprises a discharge vessel coated on the inside with a phosphor which contains a filling component emitting UV light, two or more hollow cathodes made of a material of the group Mo, W, Nb, Ta and their alloys, two or more current feed-through pins made of a material of the group Mo, W and their alloys.
  • Cold cathode fluorescent lamps are used as backlighting for liquid crystal displays.
  • a low-pressure mercury discharge generates UV radiation, which is converted into visible light by a phosphor layer applied to the inside of the discharge vessel.
  • the discharge vessel is usually made of hard glass, such as borosilicate glass, and is usually tubular.
  • electrodes which have different shapes depending on the lamp type.
  • emission-enhancing substances containing, for example, Ba, Sr, rare earth metals or yttrium
  • the contacting of the electrodes is carried out by current feedthrough pins. These are connected in a vacuum-tight manner to the discharge vessel by means of a squeezing or melting process.
  • the current feedthrough pin is provided with a glass bead, which is produced by the melting of a glass ring. This process is called glazing. Subsequently, the glass bead is connected to the discharge vessel by a crimping or melting process.
  • a material for the current feedthrough Fe-Ni-Co (Kovar) materials molybdenum, tungsten with low, adapted to the glass thermal expansion coefficient is used. With the miniaturization of the liquid crystal screens is also a
  • the object of the subject invention is therefore to provide a cold cathode fluorescent lamp, both hollow cathodes and
  • the object is solved by the characterizing part of claim 1.
  • the hollow cathode is not connected directly to the current feedthrough pin, but the connection is made via a potty or a sleeve.
  • the potty has an inner diameter which is slightly larger than the diameter of the current feedthrough pin.
  • the height of the potty moves advantageously from 0.5x to 4x diameter of the potty.
  • the potty is connected in a first process step either with the hollow cathode or with the current feedthrough pin. Potties such as hollow cathode each have a cylindrical and a bottom portion.
  • the connection potty / hollow cathode takes place on the bottom side.
  • the potty preferably consists of a material with a significantly lower melting point compared to the hollow cathode.
  • the heat input can be done for example by means of laser or resistance welding and is in the case of hollow cathodes of molybdenum or tungsten so low that a melting and preferably also a recrystallization of the hollow cathode can be avoided. During the bonding process, however, the areas of the potty where heat is applied locally may melt.
  • the potty can also be initially connected to the current feedthrough pin.
  • the potty is slipped over one end of the current feedthrough pin.
  • the heat input for example by means of laser or resistance welding, can be done on the cylinder or bottom side of the potty.
  • the second connection process of the component with hollow cathode or current feedthrough pin produced by the first connection step takes place in an analogous manner. With components produced in this way, the heat input can be kept very low, so that embrittlement is avoided.
  • the positioning of the current feedthrough pin in the potty is easy. Cold cathode fluorescent lamps with the components according to the invention therefore show no reduction in the service life even when shaken.
  • sleeve is to be understood as a tube open on both sides that, for example, may have a flange or areas with different diameters.
  • An easily manufactured connection between current feedthrough pin and hollow cathode can be achieved with a sleeve having a cylindrical and a flange portion.
  • the current feedthrough pin is inserted into the cylindrical region of the sleeve.
  • the heat input for the connection process is again preferably by means of laser or Resistance welding technology.
  • the flange of the sleeve is connected in a further process step with the bottom of the hollow cathode.
  • the sleeve can advantageously also have two regions with different diameters.
  • the first region has a diameter which is slightly larger than the diameter of the current feedthrough pin. This area is in turn connected in an analogous manner to the current feedthrough pin.
  • the second region has a diameter which is slightly larger than the diameter of the hollow cathode. This area is connected to the near-surface cylindrical portion of the hollow cathode.
  • Connection process for example, in turn, by means of heat input by laser or resistance technology, in turn, is to be performed so that a melting and preferably also a recrystallization of the hollow cathode can be avoided.
  • the current feedthrough pin is connected to a power supply pin. While the current feedthrough pin, the requirement for similarity of the expansion coefficients pin / glass significantly limits the choice of materials, this does not apply to the lamp outside power supply pin.
  • a copper clad wire (Dumet) is used for the power supply pin. This is butt welded to the current feedthrough pin to a so-called combination lift. In terms of process technology, it is better to carry out the current feedthrough pin / lead pin connection before connecting the current feedthrough pin / hollow cathode, i. to use a combi-stick for the process described above. As particularly advantageous materials for pots and sleeves have proved Ni, Fe, Co and their alloys.
  • FIG. 1 shows a schematic representation of a cold cathode fluorescent lamp
  • FIG. 2 Connection according to the invention
  • FIG. 1 shows the essential components of a cold cathode fluorescent lamp -1-, namely a discharge vessel -3- coated on the inside with phosphor -2-, the hollow cathode -4-, the current feedthrough pin -5- and the current supply pin -20-.
  • a further variant was produced by first connecting the potty -6- with the power supply pin -5- by laser welding. The subsequent connection of the hollow cathode -4- with the potty -6- was also carried out by laser welding the bottom surface -10- of the potty -6- with the outer bottom surface -11- of the hollow cathode -4-.
  • connection of the sleeve -7- was carried out with the current feed-through pin -5- by laser welding of the cylindrical portion -15- of the sleeve -7- with the power supply pin -5-.
  • the subsequent connection of the hollow cathode -A- with the sleeve -7- was carried out by laser welding of the transition region -17- with the outer bottom surface -11- of the hollow cathode -A-.
  • the inner cylinder wall -19- of the cylindrical portion -16- of the sleeve -7- was connected to the hollow cathode -4- by laser welding.

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

L'invention concerne un tube fluorescent à cathode froide (1), qui comprend essentiellement une enceinte de décharge (3) dont la face interne est revêtue d'un luminophore (2), cette enceinte de décharge contenant un composant gazeux de remplissage émettant de la lumière ultraviolette. Le tube fluorescent comporte également deux cathodes creuses (4) ou plus, en matériau du groupe Mo, W, Nb, Ta et de leurs alliages, deux tiges de passage de courant (5) ou plus, en matériau du groupe Mo, W et de leurs alliages. L'invention est caractérisée en ce qu'une tige de passage de courant (5) est reliée à une coupelle (6) ou à une douille (7), de préférence en Fe, Ni, Co ou leurs alliages, cette coupelle (6) ou cette douille (7) étant reliée à une cathode creuse (4).
EP05803084A 2004-11-18 2005-11-16 Tube fluorescent à cathode froide Withdrawn EP1812951A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0083904U AT8314U1 (de) 2004-11-18 2004-11-18 Kaltkathoden-fluoreszenzlampe
PCT/AT2005/000459 WO2006053361A1 (fr) 2004-11-18 2005-11-16 Tube fluorescent à cathode froide

Publications (1)

Publication Number Publication Date
EP1812951A1 true EP1812951A1 (fr) 2007-08-01

Family

ID=36037272

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05803084A Withdrawn EP1812951A1 (fr) 2004-11-18 2005-11-16 Tube fluorescent à cathode froide

Country Status (6)

Country Link
EP (1) EP1812951A1 (fr)
JP (1) JP2008521176A (fr)
KR (1) KR20070084116A (fr)
CN (1) CN101061566A (fr)
AT (1) AT8314U1 (fr)
WO (1) WO2006053361A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT8028U1 (de) * 2004-12-15 2005-12-15 Plansee Ag Kaltkathoden-fluoreszenzlampe
DE102007019966B3 (de) * 2007-04-27 2008-11-20 Klaus Wammes Niederdruckentladungslampe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB277739A (en) * 1926-06-18 1927-09-19 Jean Demoulin Improved luminous electric discharge tubes
TW270211B (fr) * 1993-03-17 1996-02-11 Tdk Electronics Co Ltd
US5444332A (en) * 1993-10-08 1995-08-22 Chang; Jim J. Hollow - cathode electrode for high-power, high-pressure discharge devices
US5917285A (en) * 1996-07-24 1999-06-29 Georgia Tech Research Corporation Apparatus and method for reducing operating voltage in gas discharge devices
JP2002270131A (ja) * 2001-03-12 2002-09-20 West Electric Co Ltd 冷陰極放電管及び照明装置
JP2002289133A (ja) * 2001-03-27 2002-10-04 West Electric Co Ltd 冷陰極放電管及び照明装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006053361A1 *

Also Published As

Publication number Publication date
JP2008521176A (ja) 2008-06-19
AT8314U1 (de) 2006-05-15
WO2006053361A1 (fr) 2006-05-26
CN101061566A (zh) 2007-10-24
KR20070084116A (ko) 2007-08-24

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Inventor name: DRONHOFER, ANDRE

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