EP0592915B1 - Lampe à décharge à basse pression et procédé de production d'un lampe à décharge à basse pression - Google Patents

Lampe à décharge à basse pression et procédé de production d'un lampe à décharge à basse pression Download PDF

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Publication number
EP0592915B1
EP0592915B1 EP93116008A EP93116008A EP0592915B1 EP 0592915 B1 EP0592915 B1 EP 0592915B1 EP 93116008 A EP93116008 A EP 93116008A EP 93116008 A EP93116008 A EP 93116008A EP 0592915 B1 EP0592915 B1 EP 0592915B1
Authority
EP
European Patent Office
Prior art keywords
strontium
barium
oxide
carbonate
low
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.)
Expired - Lifetime
Application number
EP93116008A
Other languages
German (de)
English (en)
Other versions
EP0592915A1 (fr
Inventor
Christian Harzig
Roland Hoffmann
Erolf Weinhardt
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 EP0592915A1 publication Critical patent/EP0592915A1/fr
Application granted granted Critical
Publication of EP0592915B1 publication Critical patent/EP0592915B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0677—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
    • 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
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part

Definitions

  • the invention relates to a low-pressure discharge lamp according to the preamble of patent claim 1 and a manufacturing method for a low-pressure discharge lamp.
  • the invention relates to an electron emitter for a cold-startable low-pressure discharge lamp with rod-shaped electrode filaments.
  • a lamp corresponding to the preamble of claim 1 is described, for example, in the book "Die Oxidkathode", volume 2, by G. Hermann and S. Wagener, Johann Ambrosius Verlag, Leipzig, 2nd edition (1950) (pages 137-139). It is a fluorescent lamp whose electrode filaments are activated using a mixture of barium and strontium carbonate. According to the authors of this book (pages 25 - 33), a mixture of equal proportions of barium and strontium carbonate provides optimal emission values after activation of the electrode filaments pasted with it. They also state that with an equimolar mixture of barium and strontium carbonate, to which approximately 10% calcium carbonate is added, good emission values are also achieved after activation of the electrodes.
  • the emitter compositions mentioned in the cited book are also suitable for so-called cold-startable low-pressure discharge lamps. These are Low-pressure discharge lamps that are ignited without preheating their electrode filaments.
  • the exemplary embodiment is a rod-shaped fluorescent lamp.
  • This lamp has a circular cylindrical discharge vessel with a diameter of approx. 26 mm and a length between 0.6 m and 1.5 m.
  • At the ends of the lamp are two double coiled, rod-shaped electrode filaments made of tungsten, sealed in a gas-tight manner.
  • the rod-shaped electrode filaments are arranged transversely to the discharge path.
  • the discharge vessel has a fluorescent coating on its inner wall.
  • the ionizable filling of the fluorescent lamp consists of mercury vapor and a noble gas mixture.
  • the electrode coils are provided with an electron emitter consisting of a mixed oxide, the mixed oxide consisting of barium oxide with up to 5 mol% of strontium oxide, and an excess of metallic barium and strontium being generated in the forming process.
  • the discharge tube of the fluorescent lamp is made from a glass tube that has been coated with fluorescent material on its inner wall.
  • the electrode frames are inserted into the ends of the discharge vessel and fused with it.
  • the electrodes are activated at the same time.
  • the lamp is then provided with the ionizable filling, consisting of krypton, argon and mercury, and the pump stem is sealed gas-tight.
  • the two electrode frames each consist of a double-coiled, rod-shaped electrode coil made of tungsten, the power supply lines of which are melted into a glass base.
  • the electrode coils carry an emitter paste made of a mixed carbonate, which consists of barium carbonate with up to 20, in particular up to 5 mol%, strontium carbonate, which is activated the electrodes are converted into barium oxide and strontium oxide, which contains small amounts of metallic barium and strontium, respectively.
  • a mixed carbonate consisting of barium carbonate and up to 20, in particular up to 5 mol%, strontium carbonate is obtained in a precipitation system from the starting materials barium nitrate, strontium nitrate and a tartrate, preferably potassium sodium tartrate.
  • the mixed carbonate is dried and then ground with butyl acetate and nitrocellulose, so that the average grain size of the carbonate powder in the suspension after the grinding process is approximately 5 ⁇ m.
  • About 80% by weight of the suspension consists of the mixed carbonate, 18% by weight of butyl acetate and 2% by weight of nitrocellulose.
  • the electrode filaments are coated with the latter by immersing them in the emitter paste or suspension.
  • the electrode filaments are heated to a temperature above 800 ° C. for a time of about 10-40 seconds by means of an electrical current flow.
  • the binder burns and the mixed carbonate is converted into the mixed oxide, the ratio of barium to strontium oxide in the mixed oxide being exactly the same as the ratio of barium to strontium carbonate in the emitter paste.
  • a small part of the barium oxide or strontium oxide is reduced to metallic barium or strontium in the activation process.
  • the metallic barium or strontium increases the electrical conductivity of the semiconducting mixed oxide and has a great influence on the electron emission of the emitter.
  • the electron emitter then exists after activation of the electrode filaments from a mixed oxide containing barium oxide and strontium oxide and a small part, approx. 0.05 mol%, of metallic barium and metallic strontium.
  • the invention is not limited to the exemplary embodiment described above.
  • the use of this emitter is not limited to the fluorescent lamp of the exemplary embodiment, but rather can be used in many commercially available low-pressure discharge lamps. It is also possible to use this emitter in high pressure sodium discharge lamps.
  • Other solvent / binder systems for example aqueous suspensions, can also be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)

Claims (3)

  1. Lampe à décharge basse pression comportant une enceinte de décharge, qui comporte deux électrodes disposées dans cette enceinte ainsi qu'un remplissage ionisable renfermé de façon étanche aux gaz dans cette enceinte, les électrodes étant réalisées sous la forme de filaments de tungstène doublement spiralés en forme de tiges et disposés transversalement à la zone de décharge et un émetteur d'électrons, l'émetteur d'électrons contenant de l'oxyde de baryum et de l'oxyde de strontium ainsi que du baryium métallique et du strontium métallique, caractérisée par le fait que l'émetteur d'électrons est constitué par de l'oxyde de baryum et par au maximum 20 % en moles d'oxyde de strontium, les oxydes contenant une proportion petite de baryum métallique et/ou de strontium métallique.
  2. Lampe à décharge basse pression suivant la revendication 1, caractérisée par le fait que l'émetteur d'électrons est constitué par de l'oxyde de baryum et par au maximum 5 % en moles d'oxyde de strontium, les oxydes contenant une proportion petite de baryum métallique et/ou de strontium métallique.
  3. Lampe à décharge basse pression suivant une ou plusieurs des revendications précédentes, caractérisée par le fait que le procédé de fabrication des filaments d'électrodes munis de l'émetteur d'électrons, inclut les étapes suivantes de fabrication :
    - préparation d'un carbonate mixte constitué de carbonate de baryum et au maximum de 20 % en moles de carbonate de strontium, dans une installation de précipitation à partir des produits de départ que sont du nitrate de baryum, du nitrate de strontium et un tartrate,
    - séchage du carbonate mixte et broyage ultérieur,
    - formation d'une pâte d'émetteur constituée de 80 parties environ de carbonate mixte et de 18 parties d'acétate de butyle ainsi que 2 parties de nitrocellulose,
    - application de la pâte d'émetteur aux filaments d'électrodes,
    - fixation par fusion des structures d'électrodes à l'enceinte de décharge,
    - établissement par pompage d'un vide à l'intérieur de l'enceinte de décharge et activation des filaments hélicoïdaux d'électrodes, le processus d'activation comprenant les étapes suivantes :
    - combustion du liant,
    - conversion du carbonate en l'oxyde,
    - enrichissement de l'oxyde en le constituant métallique, par retrait d'oxygène,
    - introduction du remplissage ionisable et fermeture, étanche aux gaz, de l'enceinte de décharge.
EP93116008A 1992-10-15 1993-10-04 Lampe à décharge à basse pression et procédé de production d'un lampe à décharge à basse pression Expired - Lifetime EP0592915B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4234843A DE4234843A1 (de) 1992-10-15 1992-10-15 Niederdruckentladungslampe und Herstellungsverfahren für eine Niederdruckentladungslampe
DE4234843 1992-10-15

Publications (2)

Publication Number Publication Date
EP0592915A1 EP0592915A1 (fr) 1994-04-20
EP0592915B1 true EP0592915B1 (fr) 1995-12-27

Family

ID=6470577

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116008A Expired - Lifetime EP0592915B1 (fr) 1992-10-15 1993-10-04 Lampe à décharge à basse pression et procédé de production d'un lampe à décharge à basse pression

Country Status (6)

Country Link
US (1) US5614784A (fr)
EP (1) EP0592915B1 (fr)
JP (1) JPH06203793A (fr)
KR (1) KR100275168B1 (fr)
CA (1) CA2107942A1 (fr)
DE (2) DE4234843A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0946968B1 (fr) * 1997-10-22 2004-05-06 Koninklijke Philips Electronics N.V. Lampe a decharge basse pression et lampe fluorescente compacte
US6384534B1 (en) 1999-12-17 2002-05-07 General Electric Company Electrode material for fluorescent lamps
US6713950B2 (en) 2001-08-22 2004-03-30 General Electric Company Low volatility slurry for emission mix powder
DE10242245A1 (de) * 2002-09-12 2004-03-25 Philips Intellectual Property & Standards Gmbh Niederdruckgasentlastungslampe mit einem Erdalkalioxidgemisch als Elektronen-Ermittersubstanz
DE112006002464T5 (de) * 2005-09-14 2008-07-24 Littelfuse, Inc., Des Plaines Gasgefüllter Überspannungsableiter, aktivierende Verbindung, Zündstreifen und Herstellungsverfahren dafür
KR100867411B1 (ko) * 2007-12-29 2008-11-06 (주)화인텍콤포지트 맨홀
CN107062027A (zh) * 2016-12-08 2017-08-18 安徽世林照明股份有限公司 一种日光灯灯管的封装工艺

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188236A (en) * 1959-12-17 1965-06-08 Gen Electric Cathodes and method of manufacture
US3798492A (en) * 1971-05-17 1974-03-19 Itt Emissive electrode
US3719856A (en) * 1971-05-19 1973-03-06 O Koppius Impregnants for dispenser cathodes
US3758809A (en) * 1971-06-07 1973-09-11 Itt Emissive fused pellet electrode
US3842469A (en) * 1971-11-19 1974-10-22 Itt Method of activating electron emissive electrodes
US3766423A (en) * 1971-12-03 1973-10-16 Itt Integral emissive electrode
US3837909A (en) * 1972-07-27 1974-09-24 Itt Coated coil emissive electrode
US4031426A (en) * 1974-07-10 1977-06-21 International Telephone And Telegraph Corporation Emissive coating for electrodes
US3969279A (en) * 1974-08-13 1976-07-13 International Telephone And Telegraph Corporation Method of treating electron emissive cathodes
JPS5837942B2 (ja) * 1977-10-21 1983-08-19 三菱電機株式会社 けい光ランプ
DE2951741C2 (de) * 1978-12-29 1984-05-30 Mitsubishi Denki K.K., Tokio/Tokyo Elektrode für eine Entladungslampe
JPS57147860A (en) * 1981-03-06 1982-09-11 Hamamatsu Tv Kk Cathode for gas discharge tube
US4897574A (en) * 1986-10-07 1990-01-30 Mitsubishi Denki Kabushiki Kaisha Hot cathode in wire form
US4836816A (en) * 1988-05-06 1989-06-06 Gte Products Corporation Method of treating tungsten cathodes
FR2658360B1 (fr) * 1990-02-09 1996-08-14 Thomson Tubes Electroniques Procede de fabrication d'une cathode impregnee et cathode obtenue par ce procede.
NL9002771A (nl) * 1990-12-17 1992-07-16 Philips Nv Lagedrukkwikdampontladingslamp.
JPH05205696A (ja) * 1991-11-25 1993-08-13 Matsushita Electric Works Ltd 放電ランプ用電極及びその製法

Also Published As

Publication number Publication date
EP0592915A1 (fr) 1994-04-20
DE4234843A1 (de) 1994-04-21
US5614784A (en) 1997-03-25
JPH06203793A (ja) 1994-07-22
KR940010169A (ko) 1994-05-24
KR100275168B1 (ko) 2001-01-15
DE59301249D1 (de) 1996-02-08
CA2107942A1 (fr) 1994-04-16

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