EP0041408B1 - Lampe à décharge - Google Patents

Lampe à décharge Download PDF

Info

Publication number
EP0041408B1
EP0041408B1 EP81302524A EP81302524A EP0041408B1 EP 0041408 B1 EP0041408 B1 EP 0041408B1 EP 81302524 A EP81302524 A EP 81302524A EP 81302524 A EP81302524 A EP 81302524A EP 0041408 B1 EP0041408 B1 EP 0041408B1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
bead portion
rod
lamp according
sealing structure
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
EP81302524A
Other languages
German (de)
English (en)
Other versions
EP0041408A3 (en
EP0041408A2 (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 according to the first part of claim 1, 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.
  • 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 comprising an electrode attached to one end of a current supply rod, and a sealing structure including a bead portion sealing the surface of the rod with a stem which extends around the rod and has a small-diametered portion around the rod at the same side of the bead portion as the electrode; characterised in that a heat-radiator member is mounted on the rod inside the sealing structure between the small-diametered portion and the 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. 1 has already been described in detail.
  • 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 closelywound 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°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)

Claims (7)

1. Une lampe à décharge comprenant une électrode (2) fixée à un extrémité d'une tige d'amenée de courant (1), et une structure de scellage comprenant une partie en bourrelet (5) scellant le surface de la tige (1) avec un fût (7) qui s'étend autour de la tige et qui présente une partie de plus petit diamètre (7') entourant la tige (1) du même côté de la partie en bourrelet (5) que l'électrode (2), caractérisée en ce qu'un organe de rayonnement de chaleur (9, 10) est monté sur la tige (1) à l'intérieur de la structure de scellage entre la partie de petit diamètre (7') et la partie en bourrelet (5).
2. Une lampe à décharge selon la revendication 1, caractérisée en ce que l'organe de rayonnement de la chaleur (9) est un organe métalliqué qui est enroulé sur la tige d'amenée de courant (1) à la manière d'un bobinage.
3. Une lampe à décharge selon la revendication 1, caractérisée en ce que l'organe de rayonnement de la chaleur (10) est un organe métallique cylindrique comportant sur sa surface périphérique extérieure des ailettes radiantes (10').
4. Une lampe à décharge selon l'une quelconque des revendications précédentes, caractérisée en ce que la partie en bourrelet (5) est une partie en bourrelet en verre.
5. Une lampe à décharge selon l'une quelconque des revendications précédentes, qui est une lampe à décharge à gaz rare du tupe à arc court.
6. Une lampe à décharge selon l'une quelconque des revendications précédentes, caractérisée en ce que la tige (1) s'étend de l'intérieur vers l'extérieur de la structure de scellage à travers la partie en bourrelet (5).
7. Une lampe à décharge selon l'une quelconque des revendications précédentes, caractérisée en ce que la structure de scellage comprend une partie de scellage évasée en verre (6) entre la partie en bourrelet (5) et le fût (7).
EP81302524A 1980-06-09 1981-06-08 Lampe à décharge Expired EP0041408B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Families Citing this family (4)

* 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
US5598063A (en) * 1992-12-16 1997-01-28 General Electric Company Means for supporting and sealing the lead structure of a lamp
DE102005046483A1 (de) * 2005-09-28 2007-03-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Entladungslampe
US8084944B2 (en) * 2006-12-22 2011-12-27 Osram Ag Lamp device and method for the production of a lamp device

Citations (1)

* 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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315116A (en) * 1965-10-22 1967-04-18 Norman C Beese High intensity short-arc lamp having bi-metallic electrode leads
USB534443I5 (fr) * 1974-12-19 1976-01-27
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.

Patent Citations (1)

* 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

Also Published As

Publication number Publication date
DE3172015D1 (en) 1985-10-03
DK157640C (da) 1990-07-02
JPS6336607Y2 (fr) 1988-09-28
DK248481A (da) 1981-12-10
ES258846Y (es) 1982-11-01
EP0041408A3 (en) 1981-12-16
ES258846U (es) 1982-03-16
JPS574160U (fr) 1982-01-09
EP0041408A2 (fr) 1981-12-09
DK157640B (da) 1990-01-29

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