EP0592915A1 - 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
EP0592915A1
EP0592915A1 EP93116008A EP93116008A EP0592915A1 EP 0592915 A1 EP0592915 A1 EP 0592915A1 EP 93116008 A EP93116008 A EP 93116008A EP 93116008 A EP93116008 A EP 93116008A EP 0592915 A1 EP0592915 A1 EP 0592915A1
Authority
EP
European Patent Office
Prior art keywords
barium
low
carbonate
pressure discharge
oxide
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
EP93116008A
Other languages
German (de)
English (en)
Other versions
EP0592915B1 (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

Links

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 experiments showed that the electron emission in the low-pressure discharge lamps according to the invention could be increased by adding strontium carbonate to the emitter paste.
  • the switching stability of the lamp according to the invention decreased again and the blackening of the discharge vessel due to sputtering emitter material increased.
  • the limit for a sufficiently good cold start strength is.
  • Particularly favorable results were achieved with a proportion of up to 5 mol% strontium carbonate in the emitter paste made of barium carbonate and with pure barium carbonate as the starting material for the emitter paste, which was set to an average grain size between 3 and 8 ⁇ m during the manufacturing process.
  • 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, two double-wound, rod-shaped electrode filaments made of tungsten are melted 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 a barium oxide emitter, an excess of metallic barium 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 barium carbonate, which is activated when the Electrodes are converted into barium oxide, which contains small amounts of metallic barium.
  • barium nitrate and a tartrate are obtained in a precipitation system after annealing barium carbonate.
  • the barium carbonate is dried and then ground with butyl acetate and nitrocellulose, so that the average grain size of the barium carbonate powder in the suspension after the grinding process is approximately 5 ⁇ m.
  • the suspension consists of about 80 wt .-% of BaCO3, 18 wt .-% butyl acetate and 2 wt .-% 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 electrical current flow.
  • the binder burns and the barium carbonate is converted into barium oxide.
  • a small part of the barium oxide is reduced to metallic barium during the activation process.
  • the metallic barium increases the electrical conductivity of the semiconducting barium oxide and has a great influence on the electron emission of the barium oxide emitter.
  • the invention is not limited to the exemplary embodiment described above. It is also possible, for example, to use mixed carbonate consisting of barium carbonate and 0 - instead of barium carbonate. Use 5 mol% strontium carbonate to prepare the emitter paste. After activation of the electrode coils, the electron emitter then consists of a mixed oxide which contains barium oxide and strontium oxide and a small part, approx. 0.05 mol%, of metallic barium and metallic strontium. The ratio of barium to strontium oxide in the electron emitter is exactly the same as the ratio of barium to strontium carbonate in the emitter paste.
  • this emitter is of course 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)
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 true EP0592915A1 (fr) 1994-04-20
EP0592915B1 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
JP2001506402A (ja) * 1997-10-22 2001-05-15 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 低圧放電ランプ及びコンパクトな蛍光ランプ
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
CN101297452A (zh) * 2005-09-14 2008-10-29 力特保险丝有限公司 充气式电涌放电器、激活化合物、点火条及相应方法
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB967273A (en) * 1959-12-17 1964-08-19 Gen Electric Improvements in cathodes and in the method of their manufacture
JPS5460777A (en) * 1977-10-21 1979-05-16 Mitsubishi Electric Corp Fluorescent lamp
GB2095893A (en) * 1981-03-06 1982-10-06 Hamamatsu Tv Co Ltd Cathode for a gas discharge tube

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE2951741C2 (de) * 1978-12-29 1984-05-30 Mitsubishi Denki K.K., Tokio/Tokyo Elektrode für eine Entladungslampe
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB967273A (en) * 1959-12-17 1964-08-19 Gen Electric Improvements in cathodes and in the method of their manufacture
JPS5460777A (en) * 1977-10-21 1979-05-16 Mitsubishi Electric Corp Fluorescent lamp
GB2095893A (en) * 1981-03-06 1982-10-06 Hamamatsu Tv Co Ltd Cathode for a gas discharge tube

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
G. HERRMANN & S. WAGENER: "The oxide-coated cathode", 1951, CHAPMAN & HALL LTD., LONDON *
PATENT ABSTRACTS OF JAPAN vol. 3, no. 84 (M - 066) 20 July 1979 (1979-07-20) *

Also Published As

Publication number Publication date
KR940010169A (ko) 1994-05-24
US5614784A (en) 1997-03-25
EP0592915B1 (fr) 1995-12-27
CA2107942A1 (fr) 1994-04-16
DE4234843A1 (de) 1994-04-21
DE59301249D1 (de) 1996-02-08
JPH06203793A (ja) 1994-07-22
KR100275168B1 (ko) 2001-01-15

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