EP0455295B1 - Hochdruckentladungslampe - Google Patents

Hochdruckentladungslampe Download PDF

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Publication number
EP0455295B1
EP0455295B1 EP19910200991 EP91200991A EP0455295B1 EP 0455295 B1 EP0455295 B1 EP 0455295B1 EP 19910200991 EP19910200991 EP 19910200991 EP 91200991 A EP91200991 A EP 91200991A EP 0455295 B1 EP0455295 B1 EP 0455295B1
Authority
EP
European Patent Office
Prior art keywords
lamp
seal
current supply
recess
supply conductors
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 - Lifetime
Application number
EP19910200991
Other languages
English (en)
French (fr)
Other versions
EP0455295A1 (de
Inventor
Marc Frans Josephina Kerckhofs
Hendrikus Albertus Maria Van Dulmen
Jozef Jan Baptist Boecks
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
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, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP0455295A1 publication Critical patent/EP0455295A1/de
Application granted granted Critical
Publication of EP0455295B1 publication Critical patent/EP0455295B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H01J61/366—Seals for leading-in conductors
    • H01J61/368—Pinched seals or analogous seals

Definitions

  • the invention relates to a high-pressure discharge lamp comprising
  • Such a discharge lamp is known from GB 2,100,404-A.
  • the known lamp is started with a voltage pulse of several kV, but when started in the hot condition it requires an even higher voltage pulse.
  • the current supply conductors are each surrounded by a glass tube which is fused to the seal at the end face thereof. Thus the creepage path between the exposed portions of the said conductors is lengthened.
  • the known lamp has the disadvantage that the glass tubes are susceptible to fracture. Another disadvantage is that the application of the tubes is difficult and leads to rejects. Especially when the current supply conductors are close together with the object of obtaining a lamp having the smallest possible dimensions, it is difficult to avoid the tube provided first, being damaged during the application of the second tube.
  • the invention has for its object to provide a lamp of the kind described in the opening paragraph, which is suitable for being ignited on a high-voltage pulse and which is of a simple construction.
  • the seal comprises a recess which runs from the first major face through to the second major face and extends from the end face between the current supply conductors.
  • the distance between the exposed portions of the current supply conductors measured along the surface of the seal is increased. This means that the creepage path between the said conductors is also increased, and the risk of flash-over is reduced.
  • the recess can be easily obtained, while the resistance to fracture of the lamp remains high.
  • the recess may be obtained by providing a saw cut in the seal. In proportion as the recess is wider, however, a larger number of saw cuts has to be made.
  • the saw cuts leave their tracks in the form of a rough surface of the boundary of the recess.
  • the boundary of the recess has at least in part a mirroring surface.
  • the recess in the seal can be obtained by processing the seal at a high temperature and removing glass at the area where the recess is to be created. This operation may in fact take place by means of profiled pinching blocks, for example, simultaneously with the formation of the seal itself when the relevant glass is softened by a rise in temperature.
  • the pinching blocks may be so shaped and dimensioned in this case, one having a local elevation and the other having a local depression, that the softened glass present at the area of the recess to be formed is pressed away from the seal.
  • the boundary of the recess has only in part a mirroring surface.
  • the lamp may be obtained very easily through the use of pinching blocks having a long operational life, since they do not or do not substantially have to touch one another. These pinching blocks may be given a local elevation, which leads to a depression at the area where the recess is to be formed.
  • the recess is then easily obtained by sawing into the seal at the area of the depression along the current supply conductors and to break out the glass from between the saw cuts, a mirroring fracture surface being created transverse to the saw cuts and consequently transverse to the direction in which the current supply conductors extend.
  • the boundary of the recess is then mirroring in as far as it has been obtained by the pinching blocks and by breaking out, and dull and coarse in as far as it has been obtained by sawing.
  • the lamp vessel may simultaneously be the discharge vessel, or alternatively it may surround the discharge vessel as an envelope.
  • the lamp may be a high-pressure mercury discharge lamp, with rare gas as a starting gas and possibly comprising metal halides as a filling constituent.
  • the lamp may be a high-pressure sodium discharge lamp or, for example, a high-pressure xenon discharge lamp.
  • the lamp may be used with the current supply conductors acting as contact pins for making contact with a lampholder.
  • the lamp may be held with its seal in a lamp cap, for example made of ceramic material.
  • This lamp cap may have a slot which extends from the base portion of the lamp cap between the current supply conductors of the lamp, as is the case with the lamp according to the cited GB 2,100,404-A. In that case the current supply conductors are separated from one another in the lamp cap by this slot. Even if the lamp is inserted in a lampholder having an upright wall which enters the slot in the lamp cap, flash-over between the current supply conductors at very high voltages is not impossible.
  • the seal of the lamp vessel is secured in a cavity of a ceramic lamp cap which has a base portion at which contact pins are present, which are connected to the current supply conductors, from which base portion extends a slot into the lamp cap between the current supply conductors, the slot being separated from the interior of the lamp cap by walls which are included in the recess in the seal.
  • the shape of the lamp cap and the recess in the seal of the lamp vessel together provide a spatial separation of exposed portions of the current supply conductors inside the lamp cap, so that flash-over in a capped lamp is effectively counteracted.
  • the high-pressure discharge lamp comprises a glass lamp vessel 1, for example of quartz glass or hard glass, with a seal 2, a pinched seal in the Figure.
  • the seal 2 has a first 3 and a second 4 major face opposing one another, mutually opposing smaller side faces 5, 6, and an end face 7.
  • a pair of electrodes 8 Inside the lamp vessel 1 there are a pair of electrodes 8 and an ionizable filling, for example of rare gas, mercury, and metal halides.
  • an ionizable filling for example of rare gas, mercury, and metal halides.
  • the seal 2 has a recess 11 which runs from the first major face 3 up to the second major face 4, and which extends from the end face 7 between the current supply conductors 9, 10.
  • the recess 11 has a boundary 12, 13, which is partly mirroring.
  • the recess 11 is obtained in that the pinched seal 2 is made with pinching blocks, of which at least one, i.e. that block which shaped the major face 3, had an elevated portion at the area of the recess 11. This elevated portion has shaped mirroring surfaces 12′ and 13′ which extend obliquely on the major face 3.
  • the seal 2 of the lamp shown is sawn in in order to obtain saw cuts 12 ⁇ , which have a dull surface. After that, the glass between the said saw cuts 12 ⁇ is broken out, a mirroring fracture surface 13 ⁇ being created.
  • the distance between the bright, exposed portions of the current supply conductors 9, 10 measured along the surface of the seal 2 is increased by twice the length of the boundary 12 thanks to the recess 11. The creepage path between these conductors is increased and thus the risk of flash-over is reduced.
  • the pair of electrodes 28 in this Figure is surrounded by a discharge vessel 28a arranged inside the lamp vessel 21.
  • the seal 22 of the lamp vessel 21 is secured in a cavity 41 of a ceramic lamp cap 40 which has a base portion 42 at which contact pins 43, 44 are present. These pins are connected to the current supply conductors 29, 30.
  • the walls 52, 53 prevent flash-over taking place between bright portions of the current supply conductors 29, 30 through the slot 51.
  • the lamps shown may be used in a lampholder which is provided with an upright wall which enters the recess 11 or the slot 51, as the case may be.
  • the lamps may be placed in a reflector and be used for forming a beam of light, for example, for accent lighting or for photographic or film takes.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)

Claims (3)

  1. Hochdruckentladungslampe mit
    - einem Glaslampenkolben (1) mit einer Abdichtung (2), mit einander gegenüberliegenden erste (3) und zweite (4) Hauptflächen, einander gegenüberliegenden kleineren Seitenflächen (5, 6) und einer Endfläche (7),
    - einem Elektrodenpaar (8) und einer ionisierbaren Füllung im Lampenkolben,
    - Stromzuführungsleitern (9, 10), die sich von dem Elektrodenpaar (8) durch die Abdichtung (2) in einem Abstand voneinander erstrecken und von der Endfläche (7) der Abdichtung herausführen, dadurch gekennzeichnet, daß die Abdichtung (2) eine Ausnehmung (11) enthält, die von der ersten Hauptfläche (3) durch die zweite Hauptfläche (4) verläuft und sich von der Endfläche (7) zwischen den Stromzuführungsleitern (9, 10) erstreckt.
  2. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, daß die Ausnehmung (11) eine Begrenzung (12, 13) hat, von der ein Teil (12′, 13′, 13˝) spiegelnd ist.
  3. Hochdruckentladungslampe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Abdichtung (22) des Lampenkolbens (21) in einem Hohlraum (4) eines Keramiklampensockels (40) befestigt ist, der einen Basisanteil (42) aufweist, in dem sich Kontaktstifte (43, 44) befinden, die mit den Stromzuführungsleitern verbunden werden, und von diesem Basisanteil (42) sich ein Schlitz (51) in den Lampensockel (40) zwischen den Stromzuführungsleitern (29, 30) erstreckt, und der Schlitz (51) vom Hohlraum (41) des Lampensockels (40) durch Wände (52, 53) getrennt wird, die in die Ausnehmung (31) in der Abdichtung (22) aufgenommen sind.
EP19910200991 1990-05-01 1991-04-25 Hochdruckentladungslampe Expired - Lifetime EP0455295B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9001035 1990-05-01
NL9001035 1990-05-01

Publications (2)

Publication Number Publication Date
EP0455295A1 EP0455295A1 (de) 1991-11-06
EP0455295B1 true EP0455295B1 (de) 1995-07-05

Family

ID=19857037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910200991 Expired - Lifetime EP0455295B1 (de) 1990-05-01 1991-04-25 Hochdruckentladungslampe

Country Status (4)

Country Link
EP (1) EP0455295B1 (de)
JP (2) JPH04230947A (de)
DE (1) DE69110968T2 (de)
HU (1) HU205486B (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9206314U1 (de) * 1992-05-11 1992-07-02 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De
DE9314451U1 (de) * 1992-10-12 1993-12-16 Philips Electronics Nv Gesockelte elektrische Lampe
EP0593117A1 (de) * 1992-10-12 1994-04-20 Koninklijke Philips Electronics N.V. Gesockelte elektrische Lampe
JP2007080678A (ja) * 2005-09-14 2007-03-29 Matsushita Electric Ind Co Ltd 金属蒸気放電ランプ、ランプソケット、および照明装置
JP4805060B2 (ja) * 2006-08-11 2011-11-02 浜松ホトニクス株式会社 フラッシュランプ
JP4587130B2 (ja) * 2006-12-08 2010-11-24 ウシオ電機株式会社 高圧放電ランプおよびその製造方法並びに光照射装置
US8193689B2 (en) 2010-10-11 2012-06-05 General Electric Company Metal halide lamp shrouding

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2100404B (en) * 1981-06-12 1985-02-13 Emi Plc Thorn Discharge lamps-combined lamp and socket
US4835439A (en) * 1987-09-29 1989-05-30 General Electric Company Increasing the oxidation resistance of molybdenum and its use for lamp seals

Also Published As

Publication number Publication date
DE69110968T2 (de) 1996-03-14
EP0455295A1 (de) 1991-11-06
DE69110968D1 (de) 1995-08-10
HU205486B (en) 1992-04-28
JPH04230947A (ja) 1992-08-19
HUT57465A (en) 1991-11-28
JP2001000018U (ja) 2001-05-11

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