EP0041408A2 - Lampe à décharge - Google Patents

Lampe à décharge Download PDF

Info

Publication number
EP0041408A2
EP0041408A2 EP81302524A EP81302524A EP0041408A2 EP 0041408 A2 EP0041408 A2 EP 0041408A2 EP 81302524 A EP81302524 A EP 81302524A EP 81302524 A EP81302524 A EP 81302524A EP 0041408 A2 EP0041408 A2 EP 0041408A2
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
glass bead
bead portion
current supply
small
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
EP81302524A
Other languages
German (de)
English (en)
Other versions
EP0041408A3 (en
EP0041408B1 (fr
Inventor
Ohyama Masachika
Fujii Masakatsu
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.)
Ushio Denki KK
Original Assignee
Ushio Denki KK
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 Ushio Denki KK filed Critical Ushio Denki KK
Publication of EP0041408A2 publication Critical patent/EP0041408A2/fr
Publication of EP0041408A3 publication Critical patent/EP0041408A3/en
Application granted granted Critical
Publication of EP0041408B1 publication Critical patent/EP0041408B1/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
    • H01J61/045—Thermic screens or reflectors

Definitions

  • the present invention relates to a discharge lamp, and more particularly, but not exclusively, to a short arc type rare gas discharge lamp which operates on a relatively large current.
  • FIG. 1 illustrates the general arrangement of an example of this type of discharge lamp.
  • An electrode 2 is attached to the inner end of a current supply rod 1, the outer end of which is connected to a cylindrical metal base 4 through an intermediate lead 3.
  • a sealing structure for the discharge lamp is composed of a glass bead portion 5 provided on the surface of the current supply rod 1, a graded seal glass portion 6 and a stem 7. In order to support the heavy electrode 2, a portion of the stem 7 is drawn into a small-diametered portion 7'.
  • the current supply rod 1 and the electrode 2 are supported by the glass bead portion 5 and the small-diametered portion 7'.
  • Figure 1 (and 2 and 3) the small-diametered portion 7' of the stem 7, and the adjacent portion of the current supply rod 1, are shown for the sake of clarity to be largely spaced apart. In practice, however they are maintained in very closely spaced relation and in loose contact with each other. In this way the current supply rod 1 may thermally expand relatively freely) whilst at the same time being supported.
  • the small-diametered portion 7' is formed by drawing the stem 7 after heating it by means of a burner. In this case, a space 8 is provided.in the stem 7 between the small-diametered portion 7' and the glass bead portion 5 so as not to exert a bad thermal influence on the latter.
  • the current supply rod 1 is heated by Joule heat or the like, resulting in the glass bead portion 5 being also heated.
  • a discharge lamp in which a heat-radiator member is mounted on a current supply rod between a small-diametered portion of a stem and a bead portion.
  • a preferred embodiment of the present invention provides a short arc type rare gas discharge lamp which is designed to effectively keep low the temperature of its glass bead portion whilst at the same time permitting the distance between the glass bead portion and the electrode to be reduced or kept short.
  • Fig. 2 is explanatory of an embodiment of the present invention, the major part of which is identical with the prior art embodiment of Fig. 1,
  • Reference numeral 9 indicates a tungsten wire closely wound in two layers on the current supply rod 1 between the glass bead portion 5 and the small-diametered portion 7' of the stem 7.
  • FIG. 3 is explanatory of another embodiment of the present invention.
  • Reference numeral 10 designates a cylindrical metal member firmly fixed on the current supply rod 1 between the glass bead portion 5 and the small-diametered portion 7'.
  • the cylindrical metal member 10 has formed on the outer peripheral surface thereof disc-shaped radiation fins 10'.
  • heat conveyed to the tungsten wire 9 or the radiation fins 10' is effectively radiated in the space 8.
  • the temperature of the glass bead portion could be lowered about 60 o C.
  • the temperature measurement point is indicated by P.
  • the present invention employs lowering the temperature of the glass bead portion 5 by making positive use of the space 8 which is formed in the vicinity of the glass bead portion 5, and by mounting a radiating member 9 or 10" on the current supply rod 1 between the glass bead portion 5 and the small-diametered portion 7' of the stem 7.
  • a discharge lamp in which the distance L between the electrode 2 and the glass bead portion 5 may be smaller than in a prior art discharge lamp.
  • L is drawn equal in all cases merely for convenience.
  • the radiating member 9 or 10' is disposed in space 8 which has not been utilized in the past, the overall length of the lamp may be reduced or kept short with practically no necessity of changing the external appearance and the shape of the lamp. Accordingly, the present invention may be of great utility in practical use.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP81302524A 1980-06-09 1981-06-08 Lampe à décharge Expired EP0041408B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP79279/80 1980-06-09
JP7927980U JPS6336607Y2 (fr) 1980-06-09 1980-06-09

Publications (3)

Publication Number Publication Date
EP0041408A2 true EP0041408A2 (fr) 1981-12-09
EP0041408A3 EP0041408A3 (en) 1981-12-16
EP0041408B1 EP0041408B1 (fr) 1985-08-28

Family

ID=13685420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81302524A Expired EP0041408B1 (fr) 1980-06-09 1981-06-08 Lampe à décharge

Country Status (5)

Country Link
EP (1) EP0041408B1 (fr)
JP (1) JPS6336607Y2 (fr)
DE (1) DE3172015D1 (fr)
DK (1) DK157640C (fr)
ES (1) ES258846Y (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274350A (en) * 1992-12-16 1994-07-20 Gen Electric Means for supporting and sealing the lead structure of a lamp
WO2007036518A3 (fr) * 2005-09-28 2008-02-14 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Lampe a decharge
CN101584023B (zh) * 2006-12-22 2011-12-28 奥斯兰姆有限公司 灯装置和用于制造灯装置的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5011577A (en) * 1989-06-08 1991-04-30 Jwi Ltd. Pressure control forming section

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US534443A (en) * 1895-02-19 Combined blacking-case and chair
US3315116A (en) * 1965-10-22 1967-04-18 Norman C Beese High intensity short-arc lamp having bi-metallic electrode leads
US3970883A (en) * 1975-04-07 1976-07-20 Varian Associates Arc lamp with movable electrode
NL7506655A (nl) * 1975-06-05 1976-12-07 Philips Nv Korte-boog ontladingslamp.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274350A (en) * 1992-12-16 1994-07-20 Gen Electric Means for supporting and sealing the lead structure of a lamp
GB2274350B (en) * 1992-12-16 1996-10-30 Gen Electric Discharge lamp
WO2007036518A3 (fr) * 2005-09-28 2008-02-14 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Lampe a decharge
CN101273435B (zh) * 2005-09-28 2010-05-19 电灯专利信托有限公司 放电灯
CN101584023B (zh) * 2006-12-22 2011-12-28 奥斯兰姆有限公司 灯装置和用于制造灯装置的方法

Also Published As

Publication number Publication date
JPS574160U (fr) 1982-01-09
DK248481A (da) 1981-12-10
DE3172015D1 (en) 1985-10-03
EP0041408A3 (en) 1981-12-16
EP0041408B1 (fr) 1985-08-28
DK157640C (da) 1990-07-02
DK157640B (da) 1990-01-29
JPS6336607Y2 (fr) 1988-09-28
ES258846Y (es) 1982-11-01
ES258846U (es) 1982-03-16

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