EP1229567A1 - Entladungslampe mit Zündgas - Google Patents

Entladungslampe mit Zündgas Download PDF

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Publication number
EP1229567A1
EP1229567A1 EP02075385A EP02075385A EP1229567A1 EP 1229567 A1 EP1229567 A1 EP 1229567A1 EP 02075385 A EP02075385 A EP 02075385A EP 02075385 A EP02075385 A EP 02075385A EP 1229567 A1 EP1229567 A1 EP 1229567A1
Authority
EP
European Patent Office
Prior art keywords
capsule
discharge lamp
lamp
radioactive
gas
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Withdrawn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
EP02075385A
Other languages
English (en)
French (fr)
Inventor
Ahmed c/o Société Civile S.P.I.D. Mokhtari
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP1229567A1 publication Critical patent/EP1229567A1/de
Withdrawn legal-status Critical Current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
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/548—Igniting arrangements, e.g. promoting ionisation for starting using radioactive means to promote ionisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/30—Igniting arrangements
    • H01J7/40—Igniting by associated radioactive materials or fillings

Definitions

  • the present invention relates to a discharge lamp containing a radioactive gas for starting said lamp.
  • It also relates to a glow type starter containing a radioactive gas and used for starting a discharge lamp.
  • the present invention finds its application, for example, in neon lamps or in miniature fluorescent lamps of the cold electrode type intended for the automotive industry or signaling, the reliability of the ignition being essential for these lamps.
  • U.S. Patent No. 2,930,872 describes a glow type starter used for ignition of elongated low-pressure discharge lamps such as lamps fluorescent. Said patent proposes a starter having characteristics of stable operation over time.
  • the starter type glow according to art previous includes an envelope containing, in addition to a filling gas, a tiny amount of radioactive krypton to provide an ionization source for remove the dark effect.
  • said lamp contains a small proportion of impurities soft.
  • the object of the present invention is to provide a discharge lamp having a longer service life.
  • radioactive krypton tends to become scarce and no longer allows the lamp to start after a few hundred hours, thereby limiting the life of said lamp.
  • the discharge lamp according to the present invention is remarkable in that the radioactive gas which it contains is enclosed in a capsule whose a wall is transparent to radioactive radiation.
  • Said capsule having a wall transparent to radioactive radiation will favor the ignition of the discharge lamp by ionization of the filling gas while avoiding consumption of the radioactive gas it contains since it is isolated filling gas through the sealed walls of the capsule. The service life of the lamp discharge is thereby increased.
  • the discharge has need for free electrons in the vicinity of the anode for the first ignition.
  • the discharge lamp according to the present invention is remarkable in that the capsule is positioned close enough to an anode of the discharge lamp in order to facilitate its ignition, when said lamp is supplied with a direct current.
  • the present invention also relates to a starter of the light type intended for ignition of a discharge lamp, said starter being characterized in that the gas radioactive it contains is enclosed in a capsule whose wall is transparent to radioactive radiation.
  • the present invention relates to a discharge lamp intended for industry automotive or signaling.
  • This discharge lamp can either be a neon lamp, or a miniature fluorescent lamp with cold electrodes.
  • the discharge lamp further comprises a capsule (15) containing a radioactive gas, a wall of said capsule being transparent to radioactive radiation in order to facilitate the ignition of the discharge lamp by ionization of the filling gas while avoiding consumption of the radioactive gas it contains.
  • the radioactive gas is radioactive krypton 36 Kr 85 , but it will be apparent to those skilled in the art that any other radioactive gas may be suitable for our application.
  • the wall transparent to radioactive radiation of the capsule is made with a glass with a thickness of 0.5 mm.
  • a capsule is not not completely transparent to radioactive radiation because it absorbs part of the radiation, but it still remains effective nonetheless.
  • the capsule is tubular in shape with a diameter ranging from 1 to 2 mm and a length ranging from 5 to 10 mm depending on the type of discharge lamp.
  • the volume of radioactive krypton 36 Kr 85 is then from 4 to 30 mm 3 under a bar, its filling pressure varying from 0.75 to 1 bar.
  • the radioactivity of krypton 36 Kr 85 being 11 million Becquerels per liter, the radioactivity of the capsule is at most 330 Becquerels.
  • the discharge lamp which contains it potentially presents a lesser nuisance for the environment than a neon tube currently manufactured which contains radioactive materials having a radioactivity of the order of 800 becquerels.
  • Fig. 2 shows the content of a discharge lamp according to the invention, the lamp comprising a radioactive gas capsule of the tubular type which is fixed according to a first method of attachment to an electrode.
  • Said capsule (20) is made of glass and is held by a metal strip (21) formed by two fixing fins (21a, 21b) which pinch the capsule and a main part (21c) welded to an electrode, which is the anode (12) in direct current.
  • a main glass tube (14) is sealed around the electrode.
  • a second glass tube called closed pumping tube (23) is also shown in this Fig. This tube makes it possible to empty the lamp of the air which it contains then to fill it with the filling gas desired via the anode (12) which is hollow.
  • Fig. 3 shows the content of a discharge lamp according to the invention, the lamp comprising a closed cup-shaped radioactive gas capsule which is attached to a another method of attachment.
  • Said capsule (30) is this time metallic and is welded to an electrode, which here is the anode (12), via a small plate metallic (30a).
  • Fig. 4 shows the content of a discharge lamp according to the invention, the lamp comprising a tube type radioactive gas capsule.
  • the capsule (20) is this time the interior of the closed pumping tube (23) whose dimensions are adapted to limit the displacements of the capsule which it contains.
  • Fig. 5 illustrates a starter of the glow type (50) according to the invention comprising a radioactive gas capsule.
  • Said starter comprises a bulb (51) filled with a rare gas (52) and two electrodes (53, 54), at least one of which is a bimetallic strip (54).
  • This blade composed of two metals with different coefficients of expansion, has the property of bending under the influence of heat.
  • voltage is applied to the choke, a light discharge occurs in the rare gas and the heat given off by the cathodic fall causes the blade to bend so that contacts are made and electrodes of the discharge lamp to which the choke is connected heat up.
  • the choke is short-circuited, which stops the discharge and causes cooling of the bimetallic blade and a reopening of the contacts.
  • the voltage pulse that results from the power failure then starts the discharge lamp.

Landscapes

  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
EP02075385A 2001-02-05 2002-01-31 Entladungslampe mit Zündgas Withdrawn EP1229567A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0101529 2001-02-05
FR0101529 2001-02-05

Publications (1)

Publication Number Publication Date
EP1229567A1 true EP1229567A1 (de) 2002-08-07

Family

ID=8859629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02075385A Withdrawn EP1229567A1 (de) 2001-02-05 2002-01-31 Entladungslampe mit Zündgas

Country Status (5)

Country Link
US (1) US20020185971A1 (de)
EP (1) EP1229567A1 (de)
JP (1) JP2002289149A (de)
KR (1) KR20020065370A (de)
CN (1) CN1371120A (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930872A (en) * 1957-03-25 1960-03-29 Gen Electric Glow switch
GB2078439A (en) * 1980-06-18 1982-01-06 Tokyo Shibaura Electric Co High pressure metal vapour discharge lamp
GB2080019A (en) * 1980-06-18 1982-01-27 Tokyo Shibaura Electric Co High pressure metal vapour discharge lamp
EP0058511A2 (de) * 1981-02-13 1982-08-25 Kabushiki Kaisha Toshiba Hochdruck-Metalldampf-Entladungslampe
JPS61198542A (ja) * 1985-02-28 1986-09-02 Toshiba Corp 高圧金属蒸気放電灯
DE3742991A1 (de) * 1986-12-22 1988-06-30 Toshiba Kawasaki Kk Metalldampf-entladungslampe
SU1091748A1 (ru) * 1982-11-01 1988-11-07 Научно-исследовательский институт ядерной физики при Томском политехническом институте Источник радиоактивных ионов

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930872A (en) * 1957-03-25 1960-03-29 Gen Electric Glow switch
GB2078439A (en) * 1980-06-18 1982-01-06 Tokyo Shibaura Electric Co High pressure metal vapour discharge lamp
GB2080019A (en) * 1980-06-18 1982-01-27 Tokyo Shibaura Electric Co High pressure metal vapour discharge lamp
EP0058511A2 (de) * 1981-02-13 1982-08-25 Kabushiki Kaisha Toshiba Hochdruck-Metalldampf-Entladungslampe
SU1091748A1 (ru) * 1982-11-01 1988-11-07 Научно-исследовательский институт ядерной физики при Томском политехническом институте Источник радиоактивных ионов
JPS61198542A (ja) * 1985-02-28 1986-09-02 Toshiba Corp 高圧金属蒸気放電灯
DE3742991A1 (de) * 1986-12-22 1988-06-30 Toshiba Kawasaki Kk Metalldampf-entladungslampe

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 198917, Derwent World Patents Index; Class K08, AN 1989-128145, XP002182005 *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 027 (E - 474) 27 January 1987 (1987-01-27) *

Also Published As

Publication number Publication date
JP2002289149A (ja) 2002-10-04
US20020185971A1 (en) 2002-12-12
CN1371120A (zh) 2002-09-25
KR20020065370A (ko) 2002-08-13

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