EP3327751A1 - Entladungslampe, fahrzeuglampe und fahrzeugbeleuchtungsvorrichtung - Google Patents

Entladungslampe, fahrzeuglampe und fahrzeugbeleuchtungsvorrichtung Download PDF

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Publication number
EP3327751A1
EP3327751A1 EP17185718.8A EP17185718A EP3327751A1 EP 3327751 A1 EP3327751 A1 EP 3327751A1 EP 17185718 A EP17185718 A EP 17185718A EP 3327751 A1 EP3327751 A1 EP 3327751A1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
atm
lamp
light emitting
emitting 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Withdrawn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
EP17185718.8A
Other languages
English (en)
French (fr)
Inventor
Kazuya Aibara
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.)
Toshiba Lighting and Technology Corp
Original Assignee
Toshiba Lighting and Technology Corp
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 Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Publication of EP3327751A1 publication Critical patent/EP3327751A1/de
Withdrawn legal-status Critical Current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
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827—Metal halide arc lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/34—Double-wall vessels or containers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/686—Blades, i.e. screens moving in a vertical plane
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/40—Controlling the intensity of light discontinuously
    • H05B41/42—Controlling the intensity of light discontinuously in two steps only

Definitions

  • Embodiments described herein relate generally to a discharge lamp, a vehicle lamp, and a vehicle lighting device.
  • a discharge lamp including a light emitting portion having a discharge space in which a discharge medium is sealed on an inside thereof, and a pair of electrodes protruding into the discharge space and disposed to face each other at a predetermined distance.
  • a light source for low beam (beam for passing) and a light source for high beam (beam for running) are provided in a headlamp for an automobile, and the low beam and the high beam are switched as necessary.
  • a discharge lamp is used as the light source for low beam and another discharge lamp or another type of lamp is used for the light source for high beam.
  • the low beam and the high beam are necessary for an operation of the automobile, since two light sources are necessary, a manufacturing cost of the headlamp is increased, and a size or design of the headlamp is limited.
  • a discharge lamp in which a light emitting portion is moved in a predetermined direction so that the discharge lamp can cope with both the low beam and the high beam.
  • a discharge lamp including a magnetic field generating unit for applying a magnetic field including a magnetic force line component is also proposed.
  • a discharge lamp includes a light emitting portion that has a discharge space in which a metal halide and inert gas are sealed on an inside thereof; and a pair of electrodes that protrudes to an inside of the discharge space and faces each other at a predetermined distance.
  • Electric power applied to the discharge lamp during a low beam is 24 W or more and 30 W or less
  • electric power applied to the discharge lamp during a high beam is 32 W or more and 38 W or less.
  • a maximum wall thickness of the light emitting portion is t (mm) and a sealing pressure of the inert gas at room temperature (25°C) is P (atm). 7.2 atm / mm ⁇ P / t atm / mm ⁇ 10.0 atm / mm
  • the discharge lamp according to the embodiments can be, for example, a High Intensity Discharge (HID) lamp used for a headlamp of an automobile.
  • HID High Intensity Discharge
  • the discharge lamp is the HID lamp used for the headlamp of the automobile, so-called horizontal lighting can be performed.
  • the discharge lamp according to the embodiments is used for the headlamp of the automobile.
  • the discharge lamp according to the embodiments may be used for other purposes.
  • a case where the discharge lamp according to the embodiments is the HID lamp used for the headlamp of the automobile is exemplified.
  • FIG. 1 is a schematic view illustrating a discharge lamp 100 according to an embodiment.
  • a forward direction is a front end side
  • a rearward direction is a rear end side
  • an upward direction is an upper end side
  • a downward direction is a lower end side.
  • the discharge lamp 100 is provided with a burner 101 and a socket 102.
  • the burner 101 is provided with an outer tube 5, an inner tube 1, an electrode mount 3, a support wire 35, a sleeve 4, and a metal band 71.
  • the outer tube 5 is provided coaxially with the inner tube 1 on an outside of the inner tube 1. That is, the burner 101 has a double-tube structure configured of the outer tube 5 and the inner tube 1.
  • the outer tube 5 is joined (welded) to the vicinity of a cylindrical portion 14 of the inner tube 1.
  • Gas is sealed in a closed space formed between the inner tube 1 and the outer tube 5.
  • the sealed gas may be gas capable of performing dielectric barrier discharge.
  • the gas sealed in the closed space formed between the inner tube 1 and the outer tube 5 is either nitrogen, argon, or a mixed gas of nitrogen and argon, and a sealing pressure of the gas is 0.1 atm or less at room temperature (25°C).
  • the outer tube 5 is formed of a material having a thermal expansion coefficient close to a thermal expansion coefficient of a material of the inner tube 1 and having ultraviolet blocking properties.
  • the outer tube 5 can be formed from, for example, quartz glass doped with an oxide such as titanium, cerium, or aluminum.
  • the inner tube 1 has a light emitting portion 11, a sealing portion 12, a boundary portion 13, and the cylindrical portion 14.
  • the light emitting portion 11, the sealing portion 12, the boundary portion 13, and the cylindrical portion 14 can be integrally formed.
  • the inner tube 1 (light emitting portion 11, the sealing portion 12, the boundary portion 13, and the cylindrical portion 14) is formed of a material having translucency and heat resistance.
  • the inner tube 1 can be formed of, for example, quartz glass or the like.
  • the light emitting portion 11 has a substantially elliptical outer shape.
  • the light emitting portion 11 is provided in the vicinity of a center of the inner tube 1.
  • a dimension (spherical length) of the light emitting portion 11 in an axial direction of the inner tube 1 can be, for example, substantially 8 mm.
  • a dimension of the light emitting portion 11 in a direction orthogonal to the axial direction of the inner tube 1 can be, for example, substantially 6 mm.
  • a discharge space 111 is provided on an inside of the light emitting portion 11.
  • a center portion of the discharge space 111 has a substantially cylindrical shape. Both end portions of the discharge space 111 have a substantially conical shape.
  • a discharge medium is sealed in the discharge space 111.
  • the discharge medium contains a metal halide 2 and an inert gas.
  • the discharge medium is substantially free of mercury.
  • the phrase "substantially free of mercury” includes not only mercury but also mercury contained in an extent of impurities.
  • the discharge medium may contain mercury if it is less than 2 mg/cc in the discharge space 111.
  • the metal halide 2 can be, for example, a halide of scandium, a halide of indium, a halide of sodium, and a halide of zinc.
  • Illustrative examples of the halogen include iodine. However, instead of iodine, bromine, chlorine, or the like can be used.
  • the inert gas sealed in the discharge space 111 may be, for example, xenon.
  • xenon besides xenon, neon, argon, krypton, or the like can be used, or a mixed gas of these can also be used.
  • the inert gas is xenon.
  • the sealing portion 12 has a form of a plate and is joined to both end portions of the light emitting portion 11.
  • the sealing portion 12 can be formed, for example, by using a pinch seal method.
  • the sealing portion 12 may be formed by a shrink seal method, and may have a cylindrical shape.
  • the cylindrical portion 14 is joined to one sealing portion 12 via the boundary portion 13.
  • the boundary portion 13 and the cylindrical portion 14 are joined to an end portion of the sealing portion 12 on a side opposite to a light emitting portion 11 side.
  • the electrode mount 3 is provided on an inside of the sealing portion 12.
  • the electrode mount 3 has a metal foil 31, an electrode 32, a coil 33, and a lead wire 34. Two sets of the electrode mount 3 (metal foil 31, the electrode 32, the coil 33, and the lead wire 34) are provided.
  • the metal foil 31 is provided on the inside of the sealing portion 12.
  • the metal foil 31 is joined to the vicinity of an end portion of the electrode 32 on a side opposite to the discharge space 111 side.
  • the metal foil 31 has a form of a thin plate and can be made of, for example, molybdenum, rhenium molybdenum, tungsten, rhenium tungsten, or the like.
  • the electrode 32 has a cylindrical shape.
  • One end portion of the electrode 32 protrudes into the discharge space 111. That is, one end of the electrode 32 is provided on the inside of the discharge space 111 and the other end is provided on the inside of the sealing portion 12. A pair of the electrodes 32 is provided so as to face each other at a predetermined distance. The other end of the electrode 32 is joined to the vicinity of an end portion of the metal foil 31 on the light emitting portion 11 side. Joining between the electrode 32 and the metal foil 31 can be performed by, for example, laser welding.
  • the electrode 32 can be formed of, for example, pure tungsten, doped tungsten, rhenium tungsten, or the like.
  • the electrode 32 may contain thorium or may not contain thorium.
  • the coil 33 is provided to suppress occurrence of cracks in the sealing portion 12.
  • the coil 33 can be formed from, for example, a metal wire made of doped tungsten.
  • the coil 33 is provided on the inside of the sealing portion 12.
  • the coil 33 is wound around an outside of the electrode 32.
  • a wire diameter of the coil 33 is substantially 30 ⁇ m to substantially 100 ⁇ m and a coil pitch can be 600% or less.
  • the lead wire 34 has a linear shape.
  • a cross-sectional shape of the lead wire 34 can be, for example, circular.
  • the lead wire 34 can be formed of, for example, molybdenum or the like.
  • One end portion of the lead wire 34 is joined to the vicinity of an end portion of the metal foil 31 on a side opposite to the light emitting portion 11 side. Joining between the lead wire 34 and the metal foil 31 can be performed by laser welding.
  • the other end of the lead wire 34 extends to the outside of the inner tube 1.
  • the support wire 35 has an L shape and is joined to an end portion of the lead wire 34 extending from a front end side of the discharge lamp 100. Joining between the support wire 35 and the lead wire 34 can be performed by laser welding.
  • the support wire 35 can be formed of, for example, nickel.
  • the sleeve 4 covers a portion of the support wire 35 extending parallel to the inner tube 1.
  • the sleeve 4 has, for example, a cylindrical shape.
  • the sleeve 4 can be formed of, for example, ceramics.
  • the metal band 71 is fixed to the vicinity of an end portion of the outer tube 5 on a rear end side.
  • the socket 102 has a body portion 61, an attachment fitting 72, a bottom terminal 81, and a side terminal 82.
  • the body portion 61 is formed of an insulating material such as resin.
  • a rear end side of the lead wire 34, a rear end side of the support wire 35, and a rear end side of the sleeve 4 are provided on an inside of the body portion 61.
  • the attachment fitting 72 is provided at an end portion of the body portion 61.
  • the attachment fitting 72 is provided on a front end side of the body portion 61.
  • the attachment fitting 72 protrudes from the body portion 61.
  • the attachment fitting 72 holds the metal band 71.
  • the metal band 71 is held by the attachment fitting 72 so that the burner 101 is held in the socket 102.
  • the bottom terminal 81 is provided on the inside of the body portion 61.
  • the bottom terminal 81 is provided on a rear end side of the body portion 61.
  • the bottom terminal 81 is formed of a conductive material.
  • the bottom terminal 81 is electrically connected to the lead wire 34.
  • the side terminal 82 is provided at a side wall of the body portion 61.
  • the side terminal 82 is provided on the rear end side of the body portion 61.
  • the side terminal 82 is formed of a conductive material.
  • the side terminal 82 is electrically connected to the support wire 35.
  • the bottom terminal 81 and the side terminal 82 are electrically connected to a lighting circuit 301.
  • the bottom terminal 81 is electrically connected to a high voltage side of the lighting circuit 301.
  • the side terminal 82 is electrically connected to a low voltage side of the lighting circuit 301.
  • the discharge lamp 100 is used for the headlamp of the automobile, the discharge lamp 100 is attached such that a center axis (tube axis) thereof is in a substantially horizontal state and the support wire 35 is positioned on a substantially lower end side (downward). Moreover, turning on the discharge lamp 100 attached in such a direction is referred to as horizontal lighting.
  • one discharge lamp 100 can cope with both the low beam and the high beam, it is possible to reduce a manufacturing cost of the headlamp. In addition, it is possible to reduce the size of the headlamp, or to increase a degree of freedom of design of the headlamp.
  • Table 1 is a table illustrating a relationship between the maximum wall thickness t of the light emitting portion 11, the sealing pressure P of the inert gas sealed in the discharge space 111 at room temperature (25°C), and the all luminous flux, and swelling of the light emitting portion 11.
  • the maximum wall thickness t of the light emitting portion 11 is a wall thickness in the vicinity of the center of the light emitting portion 11 in an axial direction of the inner tube 1.
  • An internal volume (volume of the discharge space 111) of the light emitting portion 11 was 22 ⁇ L.
  • the inert gas sealed in the discharge space 111 was xenon.
  • a weight of the metal halide 2 was 0.4 mg.
  • a material of the electrode 32 was tungsten.
  • the discharge lamp 100 capable of coping with the low beam and the high beam can be formed with a simple configuration. 7.2 atm / mm ⁇ P / t atm / mm ⁇ 10.0 atm / mm
  • the sealing pressure P of the inert gas at room temperature satisfies the following formula. 10.0 atm ⁇ P atm ⁇ 15.0 atm
  • the maximum wall thickness t of the light emitting portion 11 satisfies the following formula. 1.3 mm ⁇ t mm ⁇ 1.8 mm
  • the temperature of the electrode 32 is likely to fall outside an appropriate range. In this case, since an arc spot becomes unstable even if the temperature of the electrode 32 is too high or too low, flickering occurs. When flickering occurs, it causes discomfort to a driver and other people.
  • the arc spot can be stabilized if the distance (distance between the electrodes) between tips of the pair of the electrodes 32 satisfies the following formula. Therefore, the occurrence of the flickering can be suppressed. 3.0 mm ⁇ L 1 mm ⁇ 3.6 mm
  • a thickness dimension (diameter dimension) d of the electrode 32 is set as the following formula, it is easy to suppress the occurrence of flickering. 0.24 mm ⁇ d mm ⁇ 0.33 mm
  • a distance L2 between an outer surface of the light emitting portion 11 and an inner surface of the outer tube 5 is set as the following formula, a heat dissipation performance can be improved. Therefore, it is easy to suppress the swelling of the light emitting portion 11.
  • FIG. 2 is a schematic view illustrating a vehicle lamp 200 and a vehicle lighting device 300.
  • FIG. 3 is a block view of the vehicle lighting device 300.
  • FIG. 2 illustrates a case where the discharge lamp 100 is attached such that the pair of the electrodes 32 provided in the discharge lamp 100 is horizontal. That is, a case of the discharge lamp 100 to be horizontal lighting is illustrated.
  • the vehicle lighting device 300 is provided with the vehicle lamp 200, the lighting circuit 301, and a changeover switch 302.
  • the vehicle lamp 200 is provided with the discharge lamp 100, a housing 202, a light shielding control plate 203, and a lens 204.
  • the housing 202 reflects the light irradiated from the discharge lamp 100 to the front end side.
  • the housing 202 is formed of, for example, a metal having high reflectance.
  • a space is provided on an inside of the housing 202 and an inner surface has a parabolic shape.
  • a front end side and a rear end side of the housing 202 are opened.
  • the discharge lamp 100 is attached to the housing 202.
  • the socket 102 of the discharge lamp 100 is attached to the vicinity of the opening of the rear end side of the housing 202.
  • the burner 101 of the discharge lamp 100 is positioned at the space on the inside of the housing 202.
  • the housing 202 has a function of holding the discharge lamp 100 and a function of a reflector.
  • the light shielding control plate 203 is provided on the inside of the housing 202 and is provided on the front end side of the burner 101 and on a lower end side of the burner 101.
  • the light shielding control plate 203 is formed of a light shielding material such as a metal.
  • the light shielding control plate 203 is provided to form a light distribution called a cut line.
  • the light shielding control plate 203 is movable.
  • the lens 204 is provided so as to close the opening on the front end side of the housing 202.
  • the lens 204 can be a convex lens.
  • the lens 204 condenses the light directly incident from the discharge lamp 100 and the light reflected and incident by the housing 202 to form a desired light distribution.
  • the lighting circuit 301 is a circuit for starting of the discharge lamp 100 and maintaining the lighting.
  • the lighting circuit 301 may include, for example, an igniter circuit 301a and a ballast circuit 301b.
  • a DC power source DS such as a battery and a switch SW are electrically connected to an input side of the lighting circuit 301.
  • the discharge lamp 100 is electrically connected to an output side of the lighting circuit 301.
  • the igniter circuit 301a is composed of, for example, a transformer, a capacitor, a resistor, a semiconductor element, and the like.
  • the igniter circuit 301a generates a high voltage pulse of substantially 30 kV and applies the high voltage pulse to the discharge lamp 100. Insulation breakdown occurs between the pair of electrodes 32 and electric discharge occurs by applying a high voltage pulse of substantially 30 kV to the discharge lamp 100. That is, the igniter circuit 301a starts the discharge lamp 100.
  • the ballast circuit 301b maintains the lighting of the discharge lamp 100 started by the igniter circuit 301a.
  • the ballast circuit 301b has a low beam ballast circuit and a high beam ballast circuit.
  • Each of the low beam ballast circuit and the high beam ballast circuit has, for example, a DC/DC conversion circuit, a DC/AC conversion circuit, a current and voltage detection circuit, a control circuit, and the like.
  • the low beam ballast circuit applies electric power of 24 W or more and 30 W or less to the discharge lamp 100 during stable lighting.
  • the high beam ballast circuit applies electric power of 32 W or more and 38 W or less to the discharge lamp 100 during stable lighting.
  • the changeover switch 302 performs switching between the low beam and the high beam based on an input by a driver or the like. That is, the changeover switch 302 switches the low beam ballast circuit and high beam ballast circuit based on an input by the driver or the like. Therefore, predetermined electric power is supplied from the low beam ballast circuit or high beam ballast circuit switched by the changeover switch 302 to the discharge lamp 100.

Landscapes

  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP17185718.8A 2016-11-24 2017-08-10 Entladungslampe, fahrzeuglampe und fahrzeugbeleuchtungsvorrichtung Withdrawn EP3327751A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016227439A JP2018085222A (ja) 2016-11-24 2016-11-24 放電ランプ、車両用灯具、および車両用照明装置

Publications (1)

Publication Number Publication Date
EP3327751A1 true EP3327751A1 (de) 2018-05-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17185718.8A Withdrawn EP3327751A1 (de) 2016-11-24 2017-08-10 Entladungslampe, fahrzeuglampe und fahrzeugbeleuchtungsvorrichtung

Country Status (3)

Country Link
EP (1) EP3327751A1 (de)
JP (1) JP2018085222A (de)
CN (1) CN207116370U (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5264993A (en) * 1990-01-30 1993-11-23 Robert Bosch Gmbh Headlamp for power vehicles
JP2009043446A (ja) * 2007-08-06 2009-02-26 Harison Toshiba Lighting Corp メタルハライドランプ
EP2420407A1 (de) * 2010-08-20 2012-02-22 Koito Manufacturing Co., Ltd. Beleuchtungsschaltung für Entladungslampe
US20120056539A1 (en) * 2009-03-06 2012-03-08 Harison Toshiba Lighting Corporation Vehicle Discharge Lamp, Vehicle Discharge Lamp Device, Lighting Circuit Combined Type Vehicle Discharge Lamp Device, and Lighting Circuit
US20140042889A1 (en) * 2011-04-27 2014-02-13 Koninklijke Philips N.V. Discharge lamp with high color temperature
US20140125224A1 (en) * 2011-06-23 2014-05-08 Toshiba Lighting & Technology Corporation Mercury-Free Metal Halide Lamp for Vehicle and Metal Halide Lamp Device
EP2894656A1 (de) * 2012-09-10 2015-07-15 Toshiba Lighting & Technology Corporation Metallhalogenlampe

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5264993A (en) * 1990-01-30 1993-11-23 Robert Bosch Gmbh Headlamp for power vehicles
JP2009043446A (ja) * 2007-08-06 2009-02-26 Harison Toshiba Lighting Corp メタルハライドランプ
US20120056539A1 (en) * 2009-03-06 2012-03-08 Harison Toshiba Lighting Corporation Vehicle Discharge Lamp, Vehicle Discharge Lamp Device, Lighting Circuit Combined Type Vehicle Discharge Lamp Device, and Lighting Circuit
EP2420407A1 (de) * 2010-08-20 2012-02-22 Koito Manufacturing Co., Ltd. Beleuchtungsschaltung für Entladungslampe
US20140042889A1 (en) * 2011-04-27 2014-02-13 Koninklijke Philips N.V. Discharge lamp with high color temperature
US20140125224A1 (en) * 2011-06-23 2014-05-08 Toshiba Lighting & Technology Corporation Mercury-Free Metal Halide Lamp for Vehicle and Metal Halide Lamp Device
EP2894656A1 (de) * 2012-09-10 2015-07-15 Toshiba Lighting & Technology Corporation Metallhalogenlampe

Also Published As

Publication number Publication date
JP2018085222A (ja) 2018-05-31
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