EP0231303B1 - Tube fluorescent a fonctionnement unipolaire - Google Patents

Tube fluorescent a fonctionnement unipolaire Download PDF

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Publication number
EP0231303B1
EP0231303B1 EP86904802A EP86904802A EP0231303B1 EP 0231303 B1 EP0231303 B1 EP 0231303B1 EP 86904802 A EP86904802 A EP 86904802A EP 86904802 A EP86904802 A EP 86904802A EP 0231303 B1 EP0231303 B1 EP 0231303B1
Authority
EP
European Patent Office
Prior art keywords
anode
fluorescent lamp
discharge
cathode
lamp
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
Application number
EP86904802A
Other languages
German (de)
English (en)
Other versions
EP0231303A1 (fr
Inventor
Helmut M. Loy
Armin Eich
Sigurd Kohler
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.)
GTE Licht GmbH
Original Assignee
GTE Licht GmbH
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 GTE Licht GmbH filed Critical GTE Licht GmbH
Priority to AT86904802T priority Critical patent/ATE46985T1/de
Publication of EP0231303A1 publication Critical patent/EP0231303A1/fr
Application granted granted Critical
Publication of EP0231303B1 publication Critical patent/EP0231303B1/fr
Expired 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
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
    • 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
    • H01J61/30—Vessels; Containers
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • H01J61/325—U-shaped lamps

Definitions

  • the invention relates to a fluorescent lamp for unipolar operation, as described in "Lichttechnik", 30th year No. 3, pages 106 to 108, 1978.
  • Such a fluorescent lamp is primarily filled with mercury vapor and the inside surface of its glass bulb is coated with fluorescent material.
  • the unipolar operation is a supply with direct current or with a clocked direct voltage, namely a voltage pulsating only with one polarity, such as a sine half-wave voltage, a rectangular pulse train, etc.
  • Ohmic stabilization resistances can be avoided, a light yield improved by 20% and more compared to conventional AC operation.
  • a mercury low-pressure discharge lamp for direct current operation is known, in which separation of the gas-steam filling is avoided by coating on the anode or on a support body adjacent to the anode and heated by it during operation with mercury amalgamated tin, copper, silver, lead or alloys of these metals.
  • Ais FR-A-1 322 083 discloses a low-pressure mercury discharge lamp for direct current operation, in which the problem of cataphoresis is solved in that the discharge vessel has connecting channels between the anode and cathode for the recycling of mercury vapor from the cathode to the anode.
  • the invention has for its object to provide a fluorescent lamp for unipolar operation, in which the effect of cataphoresis can be largely reduced with simple means.
  • the invention is based on the finding that the cataphoresis can be largely reduced by producing a larger temperature gradient between the cathode and anode of the fluorescent lamp. Therefore, the invention will be dimensioned in accordance with the anode as large as possible so that they have a low current density, and only up to 10 5 A / cm 2 at rated power, is only slightly heated whereby the anode in spite of sufficient electron current.
  • the arrangement of heat dissipators supports the desired low temperature of the anode, which otherwise prevents blackening of the electrode material on the anode side.
  • the large anode results in a smaller anode drop, a smaller anode power loss and a higher efficiency.
  • the small anode current density also leads to a reduction in the amplitude of the relaxation vibrations in the anode region, which means that less high-frequency interference occurs.
  • a permanently heated cathode not only serves to prevent cataphoresis, but also increases the controllability of the fluorescent lamp and reduces the cathode drop.
  • external heating of the cathode is absolutely necessary when the lamp is regulated by varying the anode current and / or by pulse modulation. With a small effective lamp current, this is not sufficient to heat the cathode to full emission temperature.
  • the external cathode heating to constant emission temperature can be done with direct or alternating current. If several lamps are operated, the heaters can be connected in parallel and supplied with only one constant voltage source. The result of this is that external and, in addition, permanent heating of the cathode is particularly advantageous in the case of fluorescent lamps which are used for the reproduction of alphanumeric characters and images in the context of a display matrix, a display or the like.
  • the fluorescent lamp contains a U-shaped discharge vessel 5 made of glass, the inner wall of which is coated with a fluorescent substance.
  • the tube ends are seated in two uniform bases 11.
  • One base carries the cathode 4 in the form of a over the pump stem 3 oxide-coated tungsten filament, which is continuously heated via the cathode heating connections 1 and 2 by the supply of energy from the outside and thereby emits electrons.
  • the other base carries the anode 7 in the form of a disk or circular blank, the effective surface of which is 73% of the cross-sectional area of the discharge vessel 5.
  • the anode is advantageously provided with a mercury dispenser in the form of a circular bead 8 which is filled with mercury.
  • Two heat dissipators 9 'and 9 are attached to the anode 7 and serve simultaneously as an anode holder.
  • the two heat dissipators 9' and 9" are connected to two outwardly leading lamp connecting pins 10 for dissipating the heat from the lamp to the outside.
  • the anode designed as a metal body with a relatively large surface area can also have the shape of a hollow cylinder, a hemisphere or a truncated cone.
  • the anodic current density at rated power is preferably 10- 5 to about 10- 7 A / cm 2. More than 10- 5 A / cm 2 are not appropriate.
  • discharge vessel can of course differ from the embodiment described.
  • elongated, also rectangular or cuboidal discharge vessels can be used, which have discharge paths for the three colors red, green and blue.

Landscapes

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

Abstract

Afin de diminuer sensiblement la cataphorèse d'un tube fluorescent à fonctionnement unipolaire, l'anode du tube comprend une surface utile de formation du champ électrique de décharge comprise entre 60% et 100% de la surface maximale de la section transversale de l'enceinte de décharge, mesurée perpendiculairement à l'axe de décharge. Cette surface sert à diminuer la densité du courant de l'anode. L'anode est pourvue avec avantage de dissipateurs de chaleurs qui permettent d'obtenir un gradient de température encore plus élevé. Un chauffage extérieur constant de la cathode permet d'obtenir un allumage particulièrement bon et un réglage aisé de la luminosité, ce qui est avantageux pour la reproduction de signes et images alphanumériques, par exemple dans une matrice, un écran d'affichage ou similaire.

Claims (4)

1. Lampe luminescente au mercure pour fonctionnement unipolaire, comportant un tube de décharge, avec une cathode et avec une anode, caractérisée par le fait que pour réduire la cataphorèse, l'anode possède une surface efficace pour la formation du champ électrique de décharge représentant 60 à 100 % de la surface de section transversale maximale du tube de décharge mesurée perpendiculairement à l'axe de décharge.
2. Lampe luminescente selon la revendication 1, caractérisée par le fait que l'anode (8) est reliée à au moins deux dissipateurs de chaleur (9' et 9") constitués d'un matériau de conductivité thermique élevée pour l'évacuation vers l'extérieur de la chaleur produite par la lampe.
3. Lampe luminescente selon la revendication 2, comportant deux dissipateurs de chaleur, caractérisée par le fait que les dissipateurs de chaleur (9' et 9") se terminent en deux broches de connexion de la lampe (10).
4. Lampe luminescente selon la revendication 1, 2 ou 3 utilisée en particulier pour la restitution de signes et de figures alphanumériques dans le cadre d'une matrice d'indication, caractérisée par le fait que la cathode est chauffée extérieurement et en permanence.
EP86904802A 1985-07-19 1986-07-21 Tube fluorescent a fonctionnement unipolaire Expired EP0231303B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86904802T ATE46985T1 (de) 1985-07-19 1986-07-21 Leuchtstofflampe fuer unipolaren betrieb.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3525888A DE3525888C1 (de) 1985-07-19 1985-07-19 Leuchtstofflampe fuer unipolaren Betrieb
DE3525888 1985-07-19

Publications (2)

Publication Number Publication Date
EP0231303A1 EP0231303A1 (fr) 1987-08-12
EP0231303B1 true EP0231303B1 (fr) 1989-10-04

Family

ID=6276245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86904802A Expired EP0231303B1 (fr) 1985-07-19 1986-07-21 Tube fluorescent a fonctionnement unipolaire

Country Status (6)

Country Link
US (1) US4814663A (fr)
EP (1) EP0231303B1 (fr)
JP (1) JPS63500833A (fr)
KR (1) KR910001418B1 (fr)
DE (2) DE3525888C1 (fr)
WO (1) WO1987000683A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186046U (fr) * 1987-05-25 1988-11-29
GB8802237D0 (en) * 1988-02-02 1988-03-02 Shell Int Research Detection of chemicals by immunoassay
US5498930A (en) * 1989-01-20 1996-03-12 Gte Products Corporation Method of dimensioning and operating a low pressure discharge lamp
DE29602733U1 (de) * 1996-02-20 1996-04-04 Holzer Walter Prof Dr H C Ing Energiesparlampe mit gewendeltem Gasentladungsgefäß und trennbarem Vorschaltgerät
RU2010101676A (ru) * 2007-06-20 2011-07-27 Конинклейке Филипс Электроникс Н.В. (Nl) Карбид-танталовая лампа накаливания и способ ее изготовления

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1990175A (en) * 1931-05-29 1935-02-05 Gen Electric Vapor Lamp Co Gaseous electric discharge device
DE617083C (de) * 1933-11-13 1935-08-12 Philips Nv Elektrische Entladungslampe mit Gasfuellung und zwei Gluehkathoden, wobei in der Naehe einer jeden Gluehkathode eine mit dieser Gluehkathode verbundene Anode angeordnet ist
DE923497C (de) * 1943-02-05 1955-02-14 Patra Patent Treuhand Quecksilber-Niederdruckentladungslampe fuer Gleichstrombetrieb
FR1322083A (fr) * 1962-05-18 1963-03-22 Lampes Sa Lampe à décharge dans le mercure à basse pression pour fonctionnement sur du courant continu
CH631575A5 (de) * 1978-04-28 1982-08-13 Bbc Brown Boveri & Cie Verfahren zur lebensdauererhoehung eines gasentladungsgefaesses.
US4173730A (en) * 1978-07-11 1979-11-06 Westinghouse Electric Corp. Compact fluorescent lamp unit having integral circuit means for DC operation

Also Published As

Publication number Publication date
DE3525888C1 (de) 1987-01-08
WO1987000683A1 (fr) 1987-01-29
JPH0467744B2 (fr) 1992-10-29
KR910001418B1 (ko) 1991-03-05
EP0231303A1 (fr) 1987-08-12
US4814663A (en) 1989-03-21
DE3666112D1 (en) 1989-11-09
KR880700448A (ko) 1988-03-15
JPS63500833A (ja) 1988-03-24

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