EP0577275A1 - Lampe fluorescente - Google Patents

Lampe fluorescente Download PDF

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Publication number
EP0577275A1
EP0577275A1 EP93304467A EP93304467A EP0577275A1 EP 0577275 A1 EP0577275 A1 EP 0577275A1 EP 93304467 A EP93304467 A EP 93304467A EP 93304467 A EP93304467 A EP 93304467A EP 0577275 A1 EP0577275 A1 EP 0577275A1
Authority
EP
European Patent Office
Prior art keywords
fluorescent lamp
glass tube
central section
end sections
glass
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Withdrawn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
EP93304467A
Other languages
German (de)
English (en)
Inventor
Seung Jae Choi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0577275A1 publication Critical patent/EP0577275A1/fr
Withdrawn legal-status Critical Current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
    • H01J61/30—Vessels; Containers
    • 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
    • H01J61/30—Vessels; Containers
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H01J61/523—Heating or cooling particular parts of the lamp

Definitions

  • the present invention relates to fluorescent lamps.
  • luminous sources for illumination comprise incandescent lamps and electrical discharge lamps such as fluorescent lamps, mercury lamps and high-voltage sodium lamps. Fluorescent lamps are, however, preferred for domestic lighting.
  • the transparent glass tube (1) is coated on the inside with a thin film of fluorescent material (2), the base (5) and the terminal pin (10) are provided at both ends of the glass tube (1) and two electrodes (3) and (4) coated with electron radiation material are each provided in the form of a double coil of tungsten filament.
  • the glass tube is energised with AC voltage.
  • one of the electrodes e.g. 3) is a negative electrode while the other electrode (4) is positive.
  • the glass tube (1) is filled with mercury vapour and either argon or krypton at a few mmHg pressure in order to facilitate discharge.
  • an appropriate voltage is applied between the pins (10) in the two bases (5) of the glass tube, i.e. between the negative electrode (3) and the positive electrode (4).
  • an electric current is caused to flow in the filament of the negative electrode (3) in the glass tube, to cause pre-heating, so as to generate thermionic emission of electrons, which are then attracted to the filament of the positive electrode (4) by the electric field, and the discharge then takes place.
  • An electron (6) resulting from the discharge strikes a mercury atom (7) of the mercury which is vaporised as a result of the rise in temperature in the glass tube (1) and excites the mercury atom (7) so as to cause ultraviolet radiation to be radiated to the side walls of the glass tube (1).
  • the ultraviolet radiation is absorbed by this and converted into visible light (9) which is emitted from the lamp.
  • the ultraviolet radiation (8) emitted by the excited mercury atom (7) in the glass tube (1) may be absorbed by another mercury atom before arriving at the thin film of fluorescent material (2), especially if the distance between the excited mercury atom (7) and the wall of the glass tube is large. It is therefore desirable that the diameter D of the glass tube (1) be sufficiently small so as to reduce significantly this self-absorption.
  • the electron radiation material coated on the filament of the negative electrode (3) becomes slowly dispersed as a result of high-energy positive ions in the glass tube (1) colliding with the filament of the negative electrode (3) at the end of the glass tube at the time of the initial energisation of the conventional fluorescent lamp.
  • the dispersed electron radiation material is then absorbed in the side wall surrounding the negative electrode filament, and this gives rise to an effect known as the black conversion phenomenon. If this occurs over a prolonged time, the resulting area of blackness increases on the side wall of the glass tube (1).
  • dispersal of the electron radiation material reduces the number of electrons emitted from the filament and also raises the starting discharge voltage, resulting in a reduced level of light and a reduced lifetime of the fluorescent tube.
  • a fluorescent lamp comprising two end sections which house respective electrodes and a tubular central section, the end sections having a substantially larger cross-sectional area than that of the central section.
  • the ratio of the cross-sectional area of the end sections to the cross-sectional area of the central section is preferably in the range 2.0 to 4.0, and a ratio of 2.5 is especially preferred.
  • a method of manufacturing a fluorescent lamp comprising joining two end sections to respective ends of a tubular central section, the end sections having a substantially larger cross-sectional area than that of the central section, and depositing a layer of fluorescent material on the interior surface of the resulting structure.
  • the fluorescent lamp is so formed that the diameter of the narrow glass tube (19) forming the central part of the lamp is in the range 20 to 25 mm and therefore less than the diameter D of the above-described conventional glass tube (28 mm) so as to reduce the self-absorption rate of ultraviolet radiation emitted from the central area, thereby to increase the luminous efficiency.
  • the preferred diameter of the narrow glass tube (19) is 24 mm.
  • the cooling is improved by the provision of a glass drum (11) at each end of the central part, having a diameter D1 in the range 35 to 40 mm and therefore considerably larger than the diameter D of the conventional glass tube, and the temperature rise in the narrow glass tube (19) is thereby suppressed.
  • the dispersal of the coating of electron radiation material, such as barium oxide, on the negative electrode (12) filament can be reduced because sufficient space can be provided between the side wall (C1) of the glass drum (11) and the negative electrode (12) as shown in Fig. 3.
  • the dispersal can be quantified as a dispersing speed defined by Ve/P.d (where Ve is the negative electrode voltage, P is the gas pressure and d is the distance from the negative electrode), and this is clearly inversely proportional to the distance between the negative electrode (12) and the glass drum (11) wall. Consequently, as the distance between the negative electrode and the glass drum is increased, the black conversion effect is reduced.
  • the glass drum (11) has a further opening (C3) in which the narrow glass tube (19) is inserted, and on the periphery of which a projection or collar (B2) is formed so as to facilitate location of the narrow glass tube (19) during manufacture.
  • a respective glass drum (11) is inserted in and attached to each side of the narrow glass tube (19), as shown in Fig. 4, and then the fluorescent material of the thin film is coated on the inner wall of the narrow glass tube (19) and the walls of both glass drums (11).
  • a first base (17) and either the negative electrode (12) or the positive electrode (13) are then attached to the opening (B1) of one of the glass drums (11).
  • the wing parts (A, Fig. 3) of the respective electrodes are attached to electrode stems which are wider than the stems in conventional fluorescent lamps.
  • the entire structure is evacuated, and mercury and an inert gas are introduced.
  • the second base (17) is then attached to the other glass drum (11), thereby completing the manufacture of the fluorescent lamp.
  • L2 1198 mm
  • L5 100 mm
  • L6 998 mm
  • the glass drum (11) has a length L5, and most of the black conversion effect occurs here.
  • the interval between the pins (18) of each base (17) is L3, and, by making this the same as that (L1) in conventional lamps, i.e. 12 mm, it is possible to interchange the fluorescent lamp with conventional fluorescent lamps.
  • the distance between the filament of the negative electrode (12) and the side wall is greater than that of the conventional lamp shown in Fig. 1. Consequently, the dispersal of the electron radiation material generated with the filament of the conventional negative electrode is reduced.
  • the glass tube (19) can alternatively be formed as a circular shape or a U-shape.
  • the luminous efficiency is improved because the self-absorption of ultraviolet radiation is reduced in the tube by making the diameter D2 of the glass tube smaller than the diameter D of the conventional glass tube.
  • the heat from the fluorescent material coating the wall of the narrow glass tube is conducted to the glass drums (11), and these have a diameter D2 which is greater than the diameter D of the conventional glass tube, so that a cooling effect is provided by this large surface area.
  • ultraviolet radiation having a wavelength of 253.7 nm be produced.
  • such emission depends upon the vapour pressure of the mercury, which itself is temperature-dependent.
  • the dispersing phenomenon of radiation material from the filament of the negative electrode (12) in the glass drum (11) can reduce the black conversion effect occurring in the vicinity of the filament of the negative electrode (12), because the volume of the end portions of the tube is increased owing to the glass drum having a diameter D2 greater than that of the conventional glass tube. Accordingly, the fluorescent lamp of the present invention can have an increased life by reducing the black conversion in the glass drum (11) and the consequential lowering of the luminous efficiency.
  • the heat loss resulting from the heat radiated from the negative electrode (12) is reduced because of the increased distance between the filament of the negative electrode (12) in the glass drum (11) and the wall of the drum, and the thermal efficiency of the fluorescent lamp can be improved because the temperature rise of the glass drum (11) having a large diameter D1 is reduced. Accordingly, the luminous efficiency can be increased, the black conversion effect can be reduced, the self-absorption rate of ultraviolet radiation in the center of the narrow glass tube (19) can be reduced and the temperature rise of the central part can be restrained.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
EP93304467A 1992-06-27 1993-06-09 Lampe fluorescente Withdrawn EP0577275A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1132692 1992-06-27
KR1019920011326A KR940001248A (ko) 1992-06-27 1992-06-27 형광램프

Publications (1)

Publication Number Publication Date
EP0577275A1 true EP0577275A1 (fr) 1994-01-05

Family

ID=19335405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93304467A Withdrawn EP0577275A1 (fr) 1992-06-27 1993-06-09 Lampe fluorescente

Country Status (6)

Country Link
EP (1) EP0577275A1 (fr)
JP (1) JPH0660849A (fr)
KR (1) KR940001248A (fr)
CN (1) CN1085011A (fr)
AU (1) AU4152593A (fr)
CA (1) CA2094487A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008077292A1 (fr) * 2006-12-22 2008-07-03 Xiamen Donglin Electronic Co., Ltd Nouveau tube de lampe à économie d'énergie
EP2028679A2 (fr) * 2007-08-22 2009-02-25 Mass Technology (H.K.) Ltd. Tube de lampe fluorescente

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4637022B2 (ja) * 2006-01-23 2011-02-23 ハリソン東芝ライティング株式会社 誘電体バリア放電ランプ

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5699961A (en) * 1980-01-11 1981-08-11 Matsushita Electric Works Ltd Fluorescent lamp
JPS56138851A (en) * 1980-03-31 1981-10-29 Mitsubishi Electric Corp Circular fluorescent lamp
US4349765A (en) * 1977-10-31 1982-09-14 Bbc Brown, Boveri & Company, Limited Ultraviolet generating device comprising discharge tube joined to two tubular envelopes
JPS60138838A (ja) * 1983-12-27 1985-07-23 Mitsubishi Electric Corp 螢光ランプ
JPS63131458A (ja) * 1986-11-21 1988-06-03 Hitachi Ltd メタルハライドランプ
JPH03108251A (ja) * 1989-09-22 1991-05-08 Toshiba Lighting & Technol Corp 環形けい光ランプ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4349765A (en) * 1977-10-31 1982-09-14 Bbc Brown, Boveri & Company, Limited Ultraviolet generating device comprising discharge tube joined to two tubular envelopes
JPS5699961A (en) * 1980-01-11 1981-08-11 Matsushita Electric Works Ltd Fluorescent lamp
JPS56138851A (en) * 1980-03-31 1981-10-29 Mitsubishi Electric Corp Circular fluorescent lamp
JPS60138838A (ja) * 1983-12-27 1985-07-23 Mitsubishi Electric Corp 螢光ランプ
JPS63131458A (ja) * 1986-11-21 1988-06-03 Hitachi Ltd メタルハライドランプ
JPH03108251A (ja) * 1989-09-22 1991-05-08 Toshiba Lighting & Technol Corp 環形けい光ランプ

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 171 (E-080)30 October 1981 & JP-A-56 099 961 ( IMAMURA HIROSHI ) 11 August 1981 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 016 (E-092)29 January 1982 & JP-A-56 138 851 ( MITSUBISHI ) 29 October 1981 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 389 (E-669)17 October 1988 & JP-A-63 131 458 ( MIYASHITA SHIASHI ) 3 June 1988 *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 299 (E-1095)30 July 1991 & JP-A-03 108 251 ( TOSHIBA ) 8 May 1991 *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 298 (E-361)(2021) 26 November 1985 & JP-A-60 138 838 ( MITSUBISHI ) 23 July 1985 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008077292A1 (fr) * 2006-12-22 2008-07-03 Xiamen Donglin Electronic Co., Ltd Nouveau tube de lampe à économie d'énergie
EP2028679A2 (fr) * 2007-08-22 2009-02-25 Mass Technology (H.K.) Ltd. Tube de lampe fluorescente
EP2028679A3 (fr) * 2007-08-22 2010-06-09 Mass Technology (H.K.) Ltd. Tube de lampe fluorescente

Also Published As

Publication number Publication date
CA2094487A1 (fr) 1993-12-28
JPH0660849A (ja) 1994-03-04
KR940001248A (ko) 1994-01-11
AU4152593A (en) 1994-01-06
CN1085011A (zh) 1994-04-06

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