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EP0753883B1 - Lampe à décharge basse pression - Google Patents

Lampe à décharge basse pression Download PDF

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Publication number
EP0753883B1
EP0753883B1 EP96201882A EP96201882A EP0753883B1 EP 0753883 B1 EP0753883 B1 EP 0753883B1 EP 96201882 A EP96201882 A EP 96201882A EP 96201882 A EP96201882 A EP 96201882A EP 0753883 B1 EP0753883 B1 EP 0753883B1
Authority
EP
European Patent Office
Prior art keywords
discharge vessel
metal body
lamp
low
closing member
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
EP96201882A
Other languages
German (de)
English (en)
Other versions
EP0753883A1 (fr
Inventor
Jeroen Christiaan Langevoort
Andreas Sebastianus Gertrudis Geven
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 EP0753883A1 publication Critical patent/EP0753883A1/fr
Application granted granted Critical
Publication of EP0753883B1 publication Critical patent/EP0753883B1/fr
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
    • H01J61/361—Seals between parts of vessel
    • 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
    • H01J61/06—Main electrodes
    • H01J61/09—Hollow cathodes
    • 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
    • H01J61/361—Seals between parts of vessel
    • H01J61/365—Annular seals disposed between the ends of the vessel
    • 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

Definitions

  • the invention relates to a low-pressure discharge lamp provided with a tubular glass discharge vessel which is closed in a gastight manner, which comprises end portions, and which has an ionizable filling comprising rare gas, which lamp is further provided with a cylindrically curved metal body by means of which an end portion of the discharge vessel and a glass closing member are fused together and which has mutually opposed surfaces facing away from one another, which metal body has a first tubular portion extending into the discharge vessel as well as a zone which is accessible from outside the discharge vessel.
  • Such a lamp is known from EP 562 679 A1.
  • the discharge vessel of the known lamp has a metal body in the form of a tube at either end.
  • the inner and outer surfaces thereof form mutually opposed surfaces which face away from one another.
  • the discharge vessel and the closing member are both fused to one of these surfaces of the metal tube, i.e. to the outer surface.
  • the closing member is formed in that a glass tube fused to the metal tube is closed by fusion.
  • the metal tubes have a multiple function.
  • the first tubular portions thereof act as electrodes between which a discharge path extends.
  • the portions extending outside the discharge vessel and in the discharge vessel wall act as current supply and current lead-through conductors.
  • the tubes have a zone which is accessible from the outside and to which a current source can be connected.
  • the lamp may be comparatively easily manufactured because the discharge vessel can be cleaned and provided with its filling through the metal tubes.
  • the lamp may be used, for example in the form of a low-pressure mercury vapour discharge lamp or low-pressure xenon discharge lamp, for creating decorative lighting, for example line-shaped lighting, or line-shaped safety lighting, or for radiating through a panel, for example a panel for displaying alphanumerical information, or alternatively as a signal lamp.
  • the low-pressure discharge lamp with a filling of rare gas may be used, for example, as a signal lamp, for example as a traffic light lamp or a lamp in or at vehicles.
  • a disadvantage of the known lamp is that the portion at the end of the discharge path up to the end of the closing member, which portion does not contribute to the lumen output of the lamp, is comparatively long. This portion will be referred to hereinafter as the dark range.
  • the lamp of the kind described in the opening paragraph is for this purpose characterized in that the end portion of the discharge vessel and the closing member are each fused to a respective one of said mutually opposed surfaces of the metal body.
  • the fused joints of the closing member and of the end portion of the discharge vessel to the metal body may thus lie closer together in longitudinal direction, whereby the dark range of the lamp is shortened.
  • the metal body may comprise a metal having a coefficient of expansion which corresponds to that of the glass of the discharge vessel, for example, a CrNiFe alloy in the case of lime glass, for example Cr 6%, Ni 42%, remainder Fe (by weight).
  • a metal body of, for example, Ni/Fe or of NiCoFe may be used, for example Ni 29%, Co 17%, remainder Fe (by weight) may be used.
  • the discharge vessel may have such a construction, for example, at only one end portion.
  • the discharge vessel may be joined together with the metal body at that end portion in the manufacture of the lamp according to the invention and subsequently be fused to the metal body.
  • a glass tube may already have been fused to the metal body for forming a closing member.
  • the discharge vessel After the discharge vessel has been given its filling, it may be closed off from the surroundings in that the glass tube which is to form the closing member is given a seal, for example by fusion or pinching.
  • the discharge vessel may be closed at the opposite end portion, for example, in that that end portion of the discharge vessel is closed by fusion. In the operational state of the lamp, a conductor may then be applied against and/or around this end portion in order to achieve a capacitive coupling to a supply source.
  • a metal tube may be present also at this end portion, for example a metal tube which is, for example, closed by pinching and/or welding.
  • the metal body at this end portion may also be provided with a glass tube.
  • the discharge vessel is closed at this end portion then in that this glass tube is fused so as to form a closing member.
  • the glass tube may be, for example, drawn into a capillary in usual manner and subsequently closed. Alternatively, the tube may be closed by pinching.
  • the end portions may, for example, have the same construction.
  • the discharge vessel under manufacture may be divested of impurities, for example, through heating, for example while it is flushed with a gas, for example with air, while still open at both ends.
  • the discharge vessel may then be closed off at one end portion, possibly after it has been flushed with an inert gas, for example if it has previously been flushed with air. Then the discharge vessel may be closed off at its other end portion, after it has been provided with its filling.
  • the lamp according to the invention may have an ionizable filling of one or several rare gases, to which mercury may be added.
  • An inner surface of the discharge vessel may be provided with a luminescent layer.
  • a very compact design is possible in an embodiment of the lamp according to the invention which is characterized in that the metal body has a flange-shaped portion outside the discharge vessel transverse to the first tubular portion.
  • a very flat closing member may be obtained with a glass tube fused to said flange-shaped portion in that the glass tube softened at its free end is abutted against a surface.
  • An attractive embodiment is characterized in that the flange-shaped portion of the metal body forms a bottom of a channel between the first tubular portion and a second tubular portion which lies outside the discharge vessel, the end portion of the discharge vessel and the closing member being fused to the first tubular portion in the channel and to the flange-shaped portion outside the channel, respectively.
  • the end portion of the discharge vessel in this embodiment occupies comparatively little space radially with its metal body and closing member.
  • the channel is formed, for example, by deep-drawing.
  • the end portion of the lamp vessel to be joined to the metal body is preferably first heated to close to its softening point, after which the heated end portion is introduced into the channel. Then the end portion of the discharge vessel is heated further until it curls inwards and flows over the surface of the first tubular portion.
  • the metal body may be heated simultaneously therewith, for example, through high-frequency induction.
  • a metal tube extends in front of the metal body, which tube is coated with electron emitter and is connected to the metal body by electrically conducting means, the material of said means in cross-sections transverse to the metal tube having a surface area which is comparatively small relative to that of the material of the metal tube itself in cross-sections.
  • said surface area of the material of the electrically conducting means is at most 25% of that of the material of the metal tube. It is achieved by means of the comparatively small surface area of the electrically conductive means that the metal tube is thermally insulated from the metal body.
  • the metal tube is positioned in the discharge vessel, for example, in front of the metal body.
  • a dark range which is as small as possible is realised when the metal tube is positioned in the closing member in front of the metal body. This has the additional advantage that material knocked off the tube is released not in the discharge vessel but in the closing member, so that the lamp retains a high luminous efficacy during its life.
  • the low-pressure discharge lamp shown in Fig. 1 comprises a tubular glass discharge vessel 1 having end portions 2, 2' and closed in a gastight manner.
  • the discharge vessel 1 has an ionizable filling which comprises rare gas.
  • An end portion 2 of the discharge vessel 1 and a glass closing member 3 are fused to a cylindrically curved metal body 4 which has mutually opposed surfaces 4A, 4B (see also Fig. 2) which face away from one another.
  • the metal body 4 has a first tubular portion 5A which extends into the discharge vessel and a zone 4C which is accessible from outside the discharge vessel.
  • the end portion 2 of the discharge vessel 1 and the closing member 3 are each fused to a respective surface 4A, 4B of the metal body 4.
  • the discharge vessel has a similar construction at the other end 2'.
  • the discharge vessel 1 shown is bent into a meander shape.
  • the lamp may be used, for example, for radiating through a screen.
  • the discharge vessel 1 in the embodiment shown has an external diameter of 2.8 mm, a wall thickness of 0.6 mm, and a length of 1 m.
  • the discharge vessel 1 may be made, for example, from lime glass to which CeO 2 is added as an UV absorber.
  • the closing member 3 may be made, for example, from lime glass or lead glass.
  • the metal body 4 may be manufactured from a metal which has a coefficient of thermal expansion which corresponds to that of the glass fused thereto, for example a CrNiFe alloy, for example with 6% Cr, 42% Ni, remainder Fe (by weight).
  • the glass of the lamp may be hard-glass, for example borosilicate glass, in which case a metal body of, for example, 29% Ni, 17% Co, and the remainder Fe (again by weight), or a tube of Ni/Fe may have a suitable coefficient of expansion.
  • the zone 4C of the metal body 4 which is accessible from the outside facilitates an electrical connection between the lamp and a supply source.
  • the flange-shaped portion 5B of the metal body 4 forms a bottom of a channel 5 between the first tubular portion 5A and a second tubular portion 5C situated outside the discharge vessel, the end portion 2 of the discharge vessel and the closing member 3 being fused to the first tubular portion 5A in the channel and to the flange-shaped portion 5B outside the channel, respectively.
  • the material of the metal body 4 has a thickness of 0.15 mm.
  • the first tubular portion 5A has an external diameter and a length of 1 and 3 mm, respectively.
  • the external diameter and length of the second tubular portion 5C are 3.5 and 2 mm, respectively.
  • the glass tube fused to the flange-shaped portion 5B was abutted against a surface after being closed by fusion, whereby a very flat closing member is formed.
  • Fig. 3 components corresponding to those of Fig. 2 have reference numerals which are 10 higher.
  • the closing member 13 is fused to the second tubular portion 15C.
  • the closing member 13 there is a metal tube 16 which is coated with electron emitter and which is fastened to the metal body 14 by electrically conducting means 17.
  • the material of the electrically conducting means 17 has a surface area in cross-sections transverse to the metal tube 16 which is comparatively small in relation to the material of the metal tube 16 itself in cross-sections.
  • the emitter may be chosen, for example, from emitters familiar from use in lamps, for example low-pressure discharge lamps, or mixtures thereof. Very suitable is an emitter of BaO, CaO and SrO, for example obtained from equal molar portions of their carbonates. Alternatively, for example, Ba x Sr 1-x Y 2 O 4 may be used, wherein x is, for example, 0.75.
  • the electrically conducting means 17 are formed here by a nickel wire with a cross-section whose surface area is less than 25% of the surface area of the cross-section of the tube 16.
  • the metal body 24 is a tube 25 with a flange-shaped widening 25B.
  • the closing member 23 is fused to an inner portion of the flange-shaped widening 25B.
  • the outer portion of the flange-shaped widening 25B forms a zone 24C which is accessible from outside the discharge vessel and to which a supply source may be connected.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (6)

  1. Lampe à décharge à basse pression munie d'une enceinte à décharge en verre tubulaire (1) qui est fermée d'une façon étanche au gaz, qui est munie de parties terminales (2, 2') et qui présente un remplissage ionisable contenant un gaz rare, laquelle lampe est en outre munie d'un corps métallique courbé d'une façon cylindrique (4) à l'aide duquel une partie terminale (2) de l'enceinte à décharge et un organe de fermeture en verre (3) sont fusionnés ensemble et qui présente des surfaces mutuellement opposées (4A, 4B) qui s'écartent, l'une de l'autre, lequel corps métallique présente une première partie tubulaire (5A) s'étendant dans l'enceinte à décharge ainsi qu'une zone (4C) qui est accessible à partir de l'extérieur, caractérisée en ce que la partie terminale (2) de l'enceinte à décharge (1) et l'organe de fermeture (3) sont fusionnées chacun à l'une desdites surfaces mutuellement opposées (4A, 4B) du corps métallique.
  2. Lampe à décharge à basse pression selon la revendication 1, caractérisée en ce que le corps métallique (4) est muni d'une partie en forme de flasque (5B) située à l'extérieur de l'enceinte à décharge d'une façon transversale par rapport à la première partie tubulaire (5A).
  3. Lampe à décharge à basse pression selon la revendication 2, caractérisée en ce que la partie en forme de flasque (5B) du corps métallique (4) forme un fond d'un canal compris entre la première partie tubulaire (5A) et une deuxième partie tubulaire (5C) qui se situe à l'extérieur de l'enceinte à décharge, la partie terminale (2) de l'enceinte à décharge et l'organe de fermeture (3) étant fusionnés respectivement à la première partie tubulaire (5A) dans le canal et à la partie en forme de flasque située à l'extérieur du canal.
  4. Lampe à décharge à basse pression selon la revendication 1, 2 ou 3, caractérisée en ce qu'un tube métallique (16) s'étend en face du corps métallique (14), lequel tube est recouvert d'un émetteur d'électrons et est connecté au corps métallique (14) par des moyens électriquement conducteurs (17), le matériau desdits moyens en sections transversales au tube métallique (16) présentant une surface qui est relativement petite par rapport à celle du matériau du tube métallique (16) lui-même en des sections transversales.
  5. Lampe à décharge à basse pression selon la revendication 4, caractérisée en ce que ladite surface du matériau des moyens électriquement conducteurs (17) est d'au maximum 25% de celle du matériau du tube métallique (16).
  6. Lampe à décharge à basse pression selon la revendication 4 ou 5, caractérisée en ce que le tube métallique (16) est positionné dans l'organe de fermeture.
EP96201882A 1995-07-13 1996-07-05 Lampe à décharge basse pression Expired - Lifetime EP0753883B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9500622 1995-07-13
BE9500622A BE1009483A3 (nl) 1995-07-13 1995-07-13 Lagedrukontladingslamp.

Publications (2)

Publication Number Publication Date
EP0753883A1 EP0753883A1 (fr) 1997-01-15
EP0753883B1 true EP0753883B1 (fr) 1999-12-01

Family

ID=3889098

Family Applications (2)

Application Number Title Priority Date Filing Date
EP95934774A Expired - Lifetime EP0784864B1 (fr) 1995-07-13 1995-11-02 Lampe a decharge basse pression
EP96201882A Expired - Lifetime EP0753883B1 (fr) 1995-07-13 1996-07-05 Lampe à décharge basse pression

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP95934774A Expired - Lifetime EP0784864B1 (fr) 1995-07-13 1995-11-02 Lampe a decharge basse pression

Country Status (8)

Country Link
EP (2) EP0784864B1 (fr)
JP (2) JPH10505942A (fr)
KR (1) KR100399461B1 (fr)
CN (2) CN1083147C (fr)
BE (1) BE1009483A3 (fr)
DE (2) DE69507821T2 (fr)
ES (1) ES2130660T3 (fr)
WO (1) WO1997003455A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6037714A (en) * 1995-09-19 2000-03-14 Philips Electronics North America Corporation Hollow electrodes for low pressure discharge lamps, particularly narrow diameter fluorescent and neon lamps and lamps containing the same
KR100464303B1 (ko) * 1998-05-07 2005-02-28 삼성전자주식회사 방전발광소자
JP3965156B2 (ja) * 2001-09-28 2007-08-29 浜松ホトニクス株式会社 ガス放電管
CN101145484B (zh) * 2006-09-11 2010-06-09 陈宗烈 一种t2～t1规格热阴极荧光灯的制作方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR870005434A (ko) * 1985-11-27 1987-06-08 이와시끼 미쯔오 금속증기 방전램프 및 그 제조 방법
JPH0377257A (ja) * 1989-08-21 1991-04-02 Hitachi Ltd 低圧放電灯
JP3341294B2 (ja) * 1991-09-30 2002-11-05 東芝ライテック株式会社 冷陰極放電灯
KR940007647B1 (ko) * 1992-01-28 1994-08-22 삼성전자 주식회사 저압수은 방전램프
US5387837A (en) * 1992-03-27 1995-02-07 U.S. Philips Corporation Low-pressure discharge lamp and luminaire provided with such a lamp
JPH0745236A (ja) * 1993-07-28 1995-02-14 Toshiba Lighting & Technol Corp 低圧放電灯及びランプ組込み機器

Also Published As

Publication number Publication date
CN1157669A (zh) 1997-08-20
ES2130660T3 (es) 1999-07-01
WO1997003455A1 (fr) 1997-01-30
DE69507821D1 (de) 1999-03-25
BE1009483A3 (nl) 1997-04-01
EP0784864A1 (fr) 1997-07-23
KR100399461B1 (ko) 2004-03-20
JPH0935688A (ja) 1997-02-07
CN1167228A (zh) 1997-12-10
CN1083147C (zh) 2002-04-17
EP0753883A1 (fr) 1997-01-15
EP0784864B1 (fr) 1999-02-10
DE69605365D1 (de) 2000-01-05
DE69605365T2 (de) 2000-06-08
JPH10505942A (ja) 1998-06-09
DE69507821T2 (de) 1999-08-19
KR970706599A (ko) 1997-11-03

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