WO2007023353A1 - Lampe a decharge, alimentee en particulier en courant continu - Google Patents

Lampe a decharge, alimentee en particulier en courant continu Download PDF

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Publication number
WO2007023353A1
WO2007023353A1 PCT/IB2006/002263 IB2006002263W WO2007023353A1 WO 2007023353 A1 WO2007023353 A1 WO 2007023353A1 IB 2006002263 W IB2006002263 W IB 2006002263W WO 2007023353 A1 WO2007023353 A1 WO 2007023353A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
discharge lamp
lamp
wires
tubular portion
Prior art date
Application number
PCT/IB2006/002263
Other languages
English (en)
Inventor
Bruno Baiardi
Original Assignee
Space Cannon Vh S.P.A.
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 Space Cannon Vh S.P.A. filed Critical Space Cannon Vh S.P.A.
Priority to EP06795288A priority Critical patent/EP1935001A1/fr
Publication of WO2007023353A1 publication Critical patent/WO2007023353A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/52—Means forming part of the tube or lamps for the purpose of providing electrical connection to it directly applied to or forming part of the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/50—Auxiliary parts or solid material within the envelope for reducing risk of explosion upon breakage of the envelope, e.g. for use in mines

Definitions

  • the present invention relates to a discharge lamp, in particular power supplied with direct current, according to the preamble of claim 1.
  • a discharge lamp is a type of lamp based on the emission of electromagnetic radiation by an ionized-gas plasma, wherein the ionization of the gas is obtained by means of an electric discharge produced through the gas itself.
  • Fig. 1 shows a discharge lamp, power supplied by direct current, of a known type; this lamp is designated as a whole by reference number 1.
  • Said lamp 1 comprises a socket 2, adapted to provide the electrical and mechanical connection of said lamp 1, and a first tubular portion 3; first tubular portion 3 contains, at least partially, a first electrode 4, in particular an anode 4, having a first end 4A.
  • Lamp 1 also comprises a bulb 5 made of a transparent material, preferably quartz glass, which contains a high-pressure gas, usually xenon or mercury; furthermore, bulb 5 also contains the first end 4A of first electrode 4, which faces a first end 6A of a second electrode 6, in particular a cathode 6, also contained in bulb 5.
  • a bulb 5 made of a transparent material, preferably quartz glass, which contains a high-pressure gas, usually xenon or mercury; furthermore, bulb 5 also contains the first end 4A of first electrode 4, which faces a first end 6A of a second electrode 6, in particular a cathode 6, also contained in bulb 5.
  • both first electrode 4 and second electrode 6 are made of a hard metal having a high melting point, preferably tungsten or molybdenum; the gas is introduced at high pressure in bulb 5, so as to minimize the wear of first and second electrodes 4,6.
  • Second electrode 6 is at least partially contained within a second tubular portion 7, which extends from bulb 5 in a direction substantially opposite to said first tubular portion 3.
  • the electrical connection of first electrode 4 is obtained through said socket 2, which is usually comiected by means of a screw connection or a bayonet-type joint in a first contact point, not shown in Fig. 1.
  • a cable 8 allows the electrical connection between second electrode 6 and a second contact point, also not shown in Fig. 1.
  • a voltaic arc is triggered in bulb 5, which produces an electrical flow between first end 4A of first electrode 4 and first end 6A of second electrode 6; consequently, bulb 5 is heated, and the pressure of the gas contained therein increases, and the resistance between first electrode 4 and second electrode 6 reduces.
  • direct current in particular with a low- voltage, high-intensity holding current.
  • lamp 1 may be either of the short-arc type, i.e. a type allowing to accurately focus the light emitted by lamp 1 and to use a smaller bulb 5, or of the long-arc type.
  • the prior-art lamp 1 has many drawbacks, in particular as the user has to connect first electrode 4 and second electrode 6 separately and in different steps.
  • first electrode 4 is obtained by connecting socket 2 to a first contact point
  • second electrode 6 is obtained by connecting the cable 8 to a second contact point
  • connection between the cable 8 and the respective contact point is often difficult, especially when lamp 1 is used within light projectors. In fact, in such situations the connection turns out to be particularly difficult, since the contact point of the cable 8 is generally located outside the reflector which allows to reflect the light generated by lamp 1.
  • a further problem of the above-described lamp 1 consists in the fact that it must always be handled with care, even when still unused and therefore cold, because the high pressure of the gas contained therein makes it very dangerous and similar to a bomb; as a matter of fact, should bulb 5 break, the pressure of the gas accumulated therein is such that quartz fragments will be thrown around the surrounding area to a distance of several metres.
  • the main object of the present invention is to provide a discharge lamp, in particular power supplied by direct current, so designed as to overcome the drawbacks and problems of prior-art discharge lamps.
  • the present invention provides a discharge lamp, in particular power supplied by direct current, which can be easily and simply connected to the respective contact points by the user. It is another object of the present invention to provide a discharge lamp, in particular power supplied by direct current, which can be handled safely by the user and which can be installed in different apparatus without causing any damage thereto in the event that the lamp should burst.
  • the present invention provides a discharge lamp, in particular power supplied by direct current, incorporating the features set out in the annexed claims, which form an integral part of the present description.
  • FIG. 1 is a side view of a partially sectioned prior-art discharge lamp
  • Fig. 2 is a view of a sectioned perspective discharge lamp incorporating the features of the present invention. Said description and said drawings are to be considered as non-limiting examples.
  • Fig. 2 shows a perspective view of a sectioned discharge lamp, in particular power supplied by direct current, designated as a whole by reference number 11, which incorporates the features of the present invention.
  • Said lamp 11 comprises a socket, designated as a whole by reference number 12, and a first tubular portion 13 comprising a first electrode 14; first electrode 14 is fitted with a first end
  • Lamp 1 comprises a bulb 15 made of a transparent material, in particular quartz glass, which contains a high-pressure gas, preferably xenon.
  • first end 14A of first electrode 14 faces a first end 16A of a second electrode 16.
  • first electrode 14 is the cathode of lamp 11, while second electrode 16 is the anode; it is however possible to provide lamp 11 with inverted electrodes
  • first electrode 14 is the anode of lamp 11 and second electrode 16 is the cathode.
  • Both first electrode 14, having a first end 14A and a second end 14B, and second electrode 16, having a first end 16A and a second end 6B, are preferably made of tungsten.
  • Lamp 11 also comprises a second tubular portion 17, which extends from bulb 15 in a direction substantially opposite to said first tubular portion 13.
  • second end 16B of said second electrode 16 is electrically connected to said socket 12 through a plurality of wires 18, which are electrically connected in parallel to one another.
  • said wires 18 are electrically insulated, in particular through enamelling or by using insulating sheath.
  • said plurality of wires 18 follows the outer profile of said second tubular portion
  • the cage provided by the plurality of wires 18 allows to obtain the electrical connection of second electrode 16 very easily and rapidly; at the same time, it also allows to have a lamp 11 which can be handled safely by the user and which can be installed in different apparatus without damaging them should bulb 15 burst.
  • each of said wires 18 is made of tungsten and has a diameter between 0.5 and 1.5 mm, so as to provide an optimal electrical contact between second conductor 16 and socket 2 without significantly interfering with the light emitted by lamp 11.
  • socket 12 comprises a collar 12A and a ring 12B.
  • the plurality of wires 18 is connected to collar 12A of said socket 12, said collar 12A being fitted with securing means which allow for the electrical connection between second electrode 16 and the respective contact point as well as the mechanical connection between lamp 11 and the respective apparatus;
  • Fig. 2 also clearly shows that said securing means consist of a thread obtained on the outer surface of collar 12A.
  • Ring 12B is made of an insulating material, in particular ceramic, and has an axial hole 12C; said ring 12B allows first electrode 14 to pass through axial hole 12C and to insulate collar 12A electrically from said first electrode 14, in particular from second end 14B of said first electrode 14.
  • Said second end 14B is also fitted with securing means, in particular with a thread obtained on the outer portion of said second end 14B, which allow for the electrical connection between first electrode 14 and the respective contact point as well as the mechanical connection between lamp 11 and the respective apparatus.
  • the plurality of wires 18, electrically connected in parallel to one another performs the double function of providing the high quantity of electrical current required for the operation of the lamp and at the same time creating a cage which protects the integrity of the lamp, making it both safer and more efficient. All this is obtained without altering the luminous flux of the discharge lamp.
  • lamp 11 may comprise, externally to said plurality of wires 18, an additional structure made of a transparent material to prevent the user from coming directly in contact with said wires 18.
  • collar 12A and second end 14B are provided with bayonet-type securing means.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

Cette invention concerne une lampe à décharge, en particulier une telle lampe à alimentation en courant continu, comprenant les éléments suivants: douille (12); première partie tubulaire (13) comprenant une première électrode (14) avec une première (14a) et une seconde (14b) extrémités; ampoule (15) faite d'un matériau transparent et contenant un gaz haute pression, la première extrémité (14A) de la première électrode (14) et une première extrémité (16A) d'une seconde électrode (16); seconde partie tubulaire (17) comprenant ladite seconde électrode (16) et partant de l'ampoule (15) dans une direction sensiblement opposée à celle de la première partie tubulaire (13). La principale caractéristique de cette invention tient au fait qu'une seconde extrémité (16b) de la seconde électrode (16) est connectée électriquement à la douille (2) via des fils (18) eux-mêmes connectés en parallèle.
PCT/IB2006/002263 2005-08-23 2006-08-21 Lampe a decharge, alimentee en particulier en courant continu WO2007023353A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06795288A EP1935001A1 (fr) 2005-08-23 2006-08-21 Lampe a decharge, alimentee en particulier en courant continu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2005A000585 2005-08-23
ITTO20050585 ITTO20050585A1 (it) 2005-08-23 2005-08-23 Lampada a scarica, in particolare alimentata da corrente continua

Publications (1)

Publication Number Publication Date
WO2007023353A1 true WO2007023353A1 (fr) 2007-03-01

Family

ID=37613890

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/002263 WO2007023353A1 (fr) 2005-08-23 2006-08-21 Lampe a decharge, alimentee en particulier en courant continu

Country Status (3)

Country Link
EP (1) EP1935001A1 (fr)
IT (1) ITTO20050585A1 (fr)
WO (1) WO2007023353A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101882556A (zh) * 2010-08-05 2010-11-10 上海大愚光源科技有限公司 一种连续氪灯用金属阴极

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2152997A (en) * 1937-05-21 1939-04-04 Gen Electric Vapor Lamp Co Gaseous electric discharge lamp
JPS6372058A (ja) * 1986-09-12 1988-04-01 Mitsubishi Electric Corp 金属蒸気放電灯
US4961019A (en) * 1988-10-14 1990-10-02 Gte Products Corporation Metal halide lamp assembly
EP0578414A1 (fr) * 1992-06-30 1994-01-12 General Electric Company Lampe à vapeur de sodium à courant continu
US5440196A (en) * 1992-09-15 1995-08-08 Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh Dual-envelope high-pressure discharge lamp construction, and method of its manufacture
US5455480A (en) * 1992-12-14 1995-10-03 Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh High-pressure discharge lamp with ceramic discharge vessel and ceramic sealing means having lead-through comprising thin wires having a thermal coefficient of expansion substantially less than that of the ceramic sealing means
US6069456A (en) * 1997-07-21 2000-05-30 Osram Sylvania Inc. Mercury-free metal halide lamp
JP2001006616A (ja) * 1999-06-24 2001-01-12 Matsushita Electric Works Ltd 高圧放電ランプ
WO2004083900A2 (fr) * 2003-03-18 2004-09-30 Philips Intellectual Property & Standards Gmbh Lampe a decharge gazeuse

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2152997A (en) * 1937-05-21 1939-04-04 Gen Electric Vapor Lamp Co Gaseous electric discharge lamp
JPS6372058A (ja) * 1986-09-12 1988-04-01 Mitsubishi Electric Corp 金属蒸気放電灯
US4961019A (en) * 1988-10-14 1990-10-02 Gte Products Corporation Metal halide lamp assembly
EP0578414A1 (fr) * 1992-06-30 1994-01-12 General Electric Company Lampe à vapeur de sodium à courant continu
US5440196A (en) * 1992-09-15 1995-08-08 Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh Dual-envelope high-pressure discharge lamp construction, and method of its manufacture
US5455480A (en) * 1992-12-14 1995-10-03 Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh High-pressure discharge lamp with ceramic discharge vessel and ceramic sealing means having lead-through comprising thin wires having a thermal coefficient of expansion substantially less than that of the ceramic sealing means
US6069456A (en) * 1997-07-21 2000-05-30 Osram Sylvania Inc. Mercury-free metal halide lamp
JP2001006616A (ja) * 1999-06-24 2001-01-12 Matsushita Electric Works Ltd 高圧放電ランプ
WO2004083900A2 (fr) * 2003-03-18 2004-09-30 Philips Intellectual Property & Standards Gmbh Lampe a decharge gazeuse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101882556A (zh) * 2010-08-05 2010-11-10 上海大愚光源科技有限公司 一种连续氪灯用金属阴极

Also Published As

Publication number Publication date
EP1935001A1 (fr) 2008-06-25
ITTO20050585A1 (it) 2007-02-24

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