EP1935001A1 - Discharge lamp, in particular supplied with direct current - Google Patents

Discharge lamp, in particular supplied with direct current

Info

Publication number
EP1935001A1
EP1935001A1 EP06795288A EP06795288A EP1935001A1 EP 1935001 A1 EP1935001 A1 EP 1935001A1 EP 06795288 A EP06795288 A EP 06795288A EP 06795288 A EP06795288 A EP 06795288A EP 1935001 A1 EP1935001 A1 EP 1935001A1
Authority
EP
European Patent Office
Prior art keywords
electrode
discharge lamp
lamp
wires
tubular portion
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.)
Withdrawn
Application number
EP06795288A
Other languages
German (de)
French (fr)
Inventor
Bruno Baiardi
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.)
Space Cannon VH SpA
Original Assignee
Space Cannon VH SpA
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 SpA filed Critical Space Cannon VH SpA
Publication of EP1935001A1 publication Critical patent/EP1935001A1/en
Withdrawn legal-status Critical Current

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

A discharge lamp (11) is described, in particular power supplied with direct current, comprising: a socket (12); a first tubular portion (13) surrounding a first electrode (14) having a first end (14A) and a second end (14B); a bulb (15) made of a transparent material and containing high-pressure gas, the first end (14A) of said first electrode (14) and a first end (ISA) of a second electrode (16); a second tubular portion (17) surrounding said second electrode (16) and extending from the bulb (15) in a direction substantially opposite to said first tubular portion (13). The main feature of the invention consists in the fact that a second end (16B) of said second electrode (16) is connected electrically to said socket (2) through a plurality of wires 18, which are electrically connected in parallel to one another.

Description

"DISCHARGE LAMP, IN PARTICULAR SUPPLIED WITH DIRECT CURRENT"
DESCRIPTION
The present invention relates to a discharge lamp, in particular power supplied with direct current, according to the preamble of claim 1.
At present various discharge lamps are known; essentially, 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.
Generally, 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.
In the above-described lamp 1, 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. In order to turn on lamp 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. At this point it is possible to power supply lamp 1 by direct current, in particular with a low- voltage, high-intensity holding current.
Depending on the distance (or arc) which separates first end 4A of first electrode 4 from first end 6A of second electrode 6, 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.
In fact, the electrical connection of first electrode 4 is obtained by connecting socket 2 to a first contact point, whereas the electrical connection of second electrode 6 is obtained by connecting the cable 8 to a second contact point.
Moreover, the 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 risk of breakage of bulb 5 increases after prolonged usage of lamp 1, in that both first electrode 4 and second electrode 6 deteriorate and may release grains of material which, falling onto bulb 5, may cause it to burst. This inevitably represents a danger to the user and/or damage to the equipment wherein lamp 1 has been installed. In this frame, 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.
It is also an object of the present invention to provide 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. In order to achieve these objects, 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.
Further objects, features and advantages of the present invention will become apparent from the following detailed description and annexed drawings, which are supplied by way of non- limiting example, wherein:
- 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
14A and a second end 14B.
Lamp 1 comprises a bulb 15 made of a transparent material, in particular quartz glass, which contains a high-pressure gas, preferably xenon.
Within bulb 15, first end 14A of first electrode 14 faces a first end 16A of a second electrode 16.
In the representation of Fig. 2, 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
14, 16, so that 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.
According to the present invention, 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.
Preferably, said wires 18 are electrically insulated, in particular through enamelling or by using insulating sheath. In particular, said plurality of wires 18 follows the outer profile of said second tubular portion
17, of said bulb 15 and of said first tubular portion 13, so as to form a cage surrounding the portions of lamp 11 containing high-pressure gas.
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.
In a preferred embodiment of the present invention, 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.
As shown in Fig. 2, 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 advantages of the present invention are apparent from the above description.
In particular, 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.
It can be easily understood that the present invention is not limited to the discharge lamp, in particularly power supplied by direct current, described above in all its various components, but may be subject to many modifications, improvements or replacements of equivalent parts and elements without departing from the inventive idea, as clearly specified in the following claims.
Among the many possible modifications, 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.
According to another possible variant, collar 12A and second end 14B are provided with bayonet-type securing means.

Claims

1. Discharge lamp (11), in particular power supplied by direct current, comprising:
- a socket (12);
- a first tubular portion (13) comprising a first electrode (14) having a first end (14A) and a second end (14B); - a bulb (15) made of a transparent material and containing high-pressure gas, said first end (14A) of said first electrode (14) and a first end (16A) of a second electrode (16);
- a second tubular portion (17) comprising said second electrode (16) and extending from the bulb (15) in a direction substantially opposite to said first tubular portion (13), characterized by the fact that a second end (16B) of said second electrode (16) is electrically connected to said socket (2) through a plurality of wires (18), which are electrically connected in parallel to one another.
2. Discharge lamp (11) according to claim 1, characterized in that said plurality of wires (18) follows the outer profile of said first tubular portion (13), of said bulb (15) and of said second tubular portion (17), so as to form a cage which surrounds the portions of the lamp (11) containing high-pressure gas.
3. Discharge lamp (11) according to any of the preceding claims, characterized in that each of said wires (18) is made of tungsten.
4. Discharge lamp (11) according to any of the preceding claims, characterized in that each of said wires (18) has a diameter between 0.5 and 1.5 mm and allows to provide an optimal electrical contact between the second conductor (16) and the socket (2) but without interfering significantly with the light emitted by the lamp (11).
5. Discharge lamp (11) according to claim 1, characterized in that said wires (18) are electrically insulated, in particular through enamelling or by using insulating sheath.
6. Discharge lamp (11) according to any of the preceding claims, characterized in that said socket (12) comprises a collar (12A) and a ring (12B).
7. Discharge lamp (11) according to the preceding claim, characterized in that said plurality of wires (18) is connected to the collar (12A) of said socket (12).
8. Discharge lamp (11) according to the preceding claim, characterized in that said collar (12A) is fitted with securing means which allow for the electrical connection between the second electrode (16) and the respective contact point as well as the mechanical connection between the lamp (11) and an apparatus.
9. Discharge lamp (11) according to the preceding claim, characterized in that said securing means consist of a thread obtained on the outer surface of the collar (12A).
10. Discharge lamp (11) according to claim 8, characterized in that said securing means are of the bayonet type.
11. Discharge lamp (11) according to claim 6, characterized in that said ring (12B) is made of an insulating material, in particular ceramic, and allows to insulate the collar (12A) electrically from said first electrode (14), in particular from the second end (14B) of said first electrode (14).
12. Discharge lamp (11) according to the preceding claim, characterized in that said ring (12B) has an axial hole (12C) which allows the first electrode (14) to pass through.
13. Discharge lamp (11) according to claim 1, characterized in that said second end (14B) is fitted with securing means which allow for the electrical connection between the first electrode (14) and the respective contact point as well as the mechanical connection between the lamp (11) and an apparatus.
14. Discharge lamp (11) according to the preceding claim, characterized in that said securing means consist of a thread obtained on the outer portion of said second end (14B).
15. Discharge lamp (11) according to claim 13, characterized in that said securing means are of the bayonet type.
16. Discharge lamp (11) according to claim 1, characterized in that said first electrode (14) is a cathode and said second electrode (16) is an anode.
17. Discharge lamp (11) according to claim 1, characterized by the fact that it comprises, externally to said plurality of wires (18), a structure made of a transparent material for preventing the user from coming directly in contact with said wires (18).
EP06795288A 2005-08-23 2006-08-21 Discharge lamp, in particular supplied with direct current Withdrawn EP1935001A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20050585 ITTO20050585A1 (en) 2005-08-23 2005-08-23 DISCHARGE LAMP, PARTICULARLY POWERED BY A CONTINUOUS CURRENT
PCT/IB2006/002263 WO2007023353A1 (en) 2005-08-23 2006-08-21 Discharge lamp, in particular supplied with direct current

Publications (1)

Publication Number Publication Date
EP1935001A1 true EP1935001A1 (en) 2008-06-25

Family

ID=37613890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06795288A Withdrawn EP1935001A1 (en) 2005-08-23 2006-08-21 Discharge lamp, in particular supplied with direct current

Country Status (3)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101882556B (en) * 2010-08-05 2012-01-11 上海大愚光源科技有限公司 Metal cathode for continuous krypton lamp

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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 (en) * 1986-09-12 1988-04-01 Mitsubishi Electric Corp Metallic vapor discharge lamp
US4961019A (en) * 1988-10-14 1990-10-02 Gte Products Corporation Metal halide lamp assembly
US5336968A (en) * 1992-06-30 1994-08-09 General Electric Company DC operated sodium vapor lamp
DE4230815A1 (en) * 1992-09-15 1994-03-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High-pressure discharge lamp and manufacturing method for a high-pressure discharge lamp
DE4242123A1 (en) * 1992-12-14 1994-06-16 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High-pressure discharge lamp with a ceramic discharge tube
DE19731168A1 (en) * 1997-07-21 1999-01-28 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Illumination system
JP2001006616A (en) * 1999-06-24 2001-01-12 Matsushita Electric Works Ltd High-pressure discharge lamp
KR20050111770A (en) * 2003-03-18 2005-11-28 코닌클리즈케 필립스 일렉트로닉스 엔.브이. Gas discharge lamp

Non-Patent Citations (1)

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Title
See references of WO2007023353A1 *

Also Published As

Publication number Publication date
WO2007023353A1 (en) 2007-03-01
ITTO20050585A1 (en) 2007-02-24

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