JP2018092829A - Discharge lamp, vehicle illumination device, and vehicle lamp fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp compatible with both of a low beam and a high beam with a simple configuration, and a vehicle illumination device and a vehicle lamp fitting.SOLUTION: A discharge lamp includes: a light-emitting part having a discharge space filled with metal halide and inert gas therein; and a pair of electrodes projecting into the discharge space and arranged to face each other at a predetermined distance. When electric power applied to the discharge lamp at a low beam is 24 W or more and 30 W or less, electric power applied to the discharge lamp at a high beam is 32 W or more and 38 W or less, and a thickness dimension of the electrode is represented by d (mm), the thickness dimension of the electrode satisfies the following formula: 0.24(mm)≤d(mm)≤0.33(mm)SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a discharge lamp, a vehicle lighting device, and a vehicle lamp.

There is a discharge lamp provided with a light emitting part having a discharge space in which a discharge medium is enclosed, and a pair of electrodes protruding inside the discharge space and arranged to face each other at a predetermined distance.
Here, in general, a headlight of an automobile is provided with a light source for a low beam (passing beam) and a light source for a high beam (traveling beam), and switches between a low beam and a high beam as necessary. . For example, a discharge lamp is used as the light source for the low beam, and another discharge lamp or another type of lamp is used as the light source for the high beam.
Low beam and high beam are necessary for driving an automobile. However, since two light sources are required, the manufacturing cost of the headlamp is increased, and the size and design of the headlamp are limited.
Therefore, it is preferable that one discharge lamp can cope with both the low beam and the high beam. In view of this, a discharge lamp has been proposed in which the light emitting unit is moved in a predetermined direction so that both the low beam and the high beam can be handled. There has also been proposed a discharge lamp provided with a magnetic field generating means for applying a magnetic field including a magnetic force line component.
However, in such a case, the configuration of the discharge lamp becomes complicated.
Therefore, it has been desired to develop a discharge lamp capable of handling a low beam and a high beam with a simple configuration.

JP 2009-117062 A Japanese Patent Laid-Open No. 2002-10032

  The problem to be solved by the present invention is to provide a discharge lamp, a vehicular lighting device, and a vehicular lamp that can handle low and high beams with a simple configuration.

A discharge lamp according to an embodiment includes: a light emitting portion having a discharge space in which a metal halide and an inert gas are sealed; and a light emitting portion protruding inside the discharge space and arranged to face each other at a predetermined distance. And a pair of electrodes.
The power applied to the discharge lamp in the low beam is 24 W or more and 30 W or less, the power applied to the discharge lamp in the high beam is 32 W or more and 38 W or less, and the thickness dimension of the electrode is d (mm). Then, the thickness dimension of the electrode satisfies the following formula.
0.24 (mm) ≦ d (mm) ≦ 0.33 (mm)

  According to the embodiment of the present invention, it is possible to provide a discharge lamp, a vehicular illumination device, and a vehicular lamp that can handle a low beam and a high beam with a simple configuration.

It is a schematic diagram for illustrating the discharge lamp 100 according to the present embodiment. It is a schematic diagram for illustrating the vehicular lamp 200 and the vehicular lighting device 300. It is a block diagram of the illuminating device 300 for vehicles.

Hereinafter, embodiments will be illustrated with reference to the drawings.
The discharge lamp according to the embodiment of the present invention can be, for example, an HID (High Intensity Discharge) lamp used for an automobile headlamp. Further, when the discharge lamp is an HID lamp used for a headlight of an automobile, so-called horizontal lighting can be performed.

  The discharge lamp according to the embodiment of the present invention is preferably used for an automotive headlamp. However, the discharge lamp according to the embodiment of the present invention may be used for other purposes. Here, the case where the discharge lamp which concerns on embodiment of this invention is a HID lamp used for the headlamp of a motor vehicle is illustrated.

FIG. 1 is a schematic diagram for illustrating a discharge lamp 100 according to the present embodiment.
In addition, in FIG. 1, when the discharge lamp 100 is attached to an automobile, the front direction is the front end side, the rear direction is the rear end side, the upper direction is the upper end side, and the lower direction is the lower end side. It is said.

As shown in FIG. 1, 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 outside the inner tube 1 and concentric with the inner tube 1. That is, the burner 101 has a double tube structure including the outer tube 5 and the inner tube 1. The outer tube 5 is joined (welded) near the cylindrical portion 14 of the inner tube 1.
Gas is enclosed in a closed space formed between the inner tube 1 and the outer tube 5. The sealed gas can be a gas capable of dielectric barrier discharge.
Details regarding the gas to be sealed will be described later.

  The outer tube 5 is preferably formed of a material having a thermal expansion coefficient close to that of the material of the inner tube 1 and having an ultraviolet blocking property. The outer tube 5 can be formed of, for example, quartz glass to which an oxide such as titanium, cerium, or aluminum is added.

The inner tube 1 has a light emitting part 11, a sealing part 12, a boundary part 13, and a cylindrical part 14. The light emitting part 11, the sealing part 12, the boundary part 13, and the cylindrical part 14 can be integrally formed.
The inner tube 1 (the light emitting part 11, the sealing part 12, the boundary part 13, and the cylindrical part 14) is formed from a material having translucency and heat resistance. The inner tube 1 can be formed from, for example, quartz glass.

  The light emitting unit 11 has a substantially ellipsoidal outer shape. The light emitting unit 11 is provided near the center of the inner tube 1. The dimension (sphere length) of the light emitting part 11 in the axial direction of the inner tube 1 can be set to about 8 mm, for example. The dimension of the light emitting part 11 in the direction orthogonal to the axial direction of the inner tube 1 can be set to about 6 mm, for example.

  A discharge space 111 is provided inside the light emitting unit 11. The central 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 enclosed in the discharge space 111. The discharge medium includes a metal halide 2 and an inert gas.

  Further, from the viewpoint of environmental protection, the discharge medium is substantially free of mercury. In the present specification, “substantially free of mercury” not only does not contain mercury at all, but also allows mercury to be contained to the extent of impurities. For example, the discharge medium can contain mercury as long as it is less than 2 mg / cc in the discharge space 111.

  The metal halide 2 may include, for example, scandium halide, indium halide, sodium halide, and zinc halide. As the halogen, for example, iodine can be exemplified. However, bromine or chlorine can be used instead of iodine.

  The inert gas sealed in the discharge space 111 can be xenon, for example. In addition to xenon, neon, argon, krypton, or the like, or a mixed gas in which these are combined can also be used. However, the inert gas is more preferably xenon.

  The sealing portion 12 has a plate shape and is joined to each of both end portions of the light emitting portion 11. The sealing portion 12 can be formed using, for example, a pinch seal method. Note that the sealing portion 12 may be formed by a shrink seal method and may have a cylindrical shape. A cylindrical portion 14 is joined to one sealing portion 12 via a boundary portion 13.

  The boundary portion 13 and the cylindrical portion 14 are joined to the end portion of the sealing portion 12 on the side opposite to the light emitting portion 11 side.

The electrode mount 3 is provided inside the sealing portion 12.
The electrode mount 3 includes a metal foil 31, an electrode 32, a coil 33, and a lead wire 34. Two sets of electrode mounts 3 (metal foil 31, electrode 32, coil 33, and lead wire 34) are provided.

The metal foil 31 is provided inside the sealing part 12. The metal foil 31 is joined in the vicinity of the end of the electrode 32 on the side opposite to the discharge space 111 side.
The metal foil 31 has a thin plate shape and can be formed of, for example, molybdenum, rhenium molybdenum, tungsten, rhenium tungsten, or the like.

The electrode 32 has a cylindrical shape.
One end of the electrode 32 protrudes into the discharge space 111. That is, one end of the electrode 32 is provided in the discharge space 111 and the other end is provided in the sealing portion 12. The pair of electrodes 32 are provided to face each other at a predetermined distance. The other end of the electrode 32 is bonded to the vicinity of the end of the metal foil 31 on the light emitting unit 11 side. The joining of the electrode 32 and the metal foil 31 can be performed by, for example, laser welding.

  The electrode 32 can be formed from, 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 the 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 inside the sealing portion 12. The coil 33 is wound around the outside of the electrode 32. For example, the coil 33 can have a wire diameter of about 30 μm to 100 μm and a coil pitch of 600% or less.

  The lead wire 34 has a linear shape. The cross-sectional shape of the lead wire 34 can be circular, for example. The lead wire 34 can be formed from, for example, molybdenum. One end side of the lead wire 34 is joined to the vicinity of the end of the metal foil 31 on the side opposite to the light emitting unit 11 side. The lead wire 34 and the metal foil 31 can be joined by laser welding. The other end side 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 the end portion of the lead wire 34 extending from the front end side of the discharge lamp 100. The support wire 35 and the lead wire 34 can be joined by laser welding. The support wire 35 can be formed from nickel, for example.

  The sleeve 4 covers a portion of the support wire 35 that extends in parallel with the inner tube 1. The sleeve 4 has, for example, a cylindrical shape. The sleeve 4 can be formed from, for example, ceramics.

  The metal band 71 is fixed in the vicinity of the end portion on the rear end side of the outer tube 5.

The socket 102 has a main body 61, a mounting bracket 72, a bottom terminal 81, and a side terminal 82.
The main body 61 is made of an insulating material such as resin. Inside the main body 61, 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.

  The mounting bracket 72 is provided at the end of the main body 61. The mounting bracket 72 is provided on the front end side of the main body 61. The mounting bracket 72 protrudes from the main body 61. The mounting bracket 72 holds the metal band 71. The burner 101 is held by the socket 102 by holding the metal band 71 by the mounting bracket 72.

  The bottom terminal 81 is provided inside the main body 61. The bottom terminal 81 is provided on the rear end side of the main body 61. The bottom terminal 81 is made of a conductive material. The bottom terminal 81 is electrically connected to the lead wire 34.

  The side terminal 82 is provided on the side wall of the main body 61. The side terminal 82 is provided on the rear end side of the main body 61. The side terminal 82 is made 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 the lighting circuit 301. In this case, the bottom terminal 81 is electrically connected to the high voltage side of the lighting circuit 301. The side terminal 82 is electrically connected to the low voltage side of the lighting circuit 301.

  When the discharge lamp 100 is used for an automobile headlamp, the discharge lamp 100 has a central axis (tube axis) in a substantially horizontal state, and the support wire 35 is positioned substantially at the lower end side (downward). Attached to. Note that lighting the discharge lamp 100 attached in such a direction is referred to as horizontal lighting.

Here, if one discharge lamp 100 can cope with both the low beam and the high beam, the manufacturing cost of the headlamp can be reduced. In addition, the size of the headlamp can be reduced, and the degree of freedom in designing the headlamp can be increased.
In this case, if the power applied to the discharge lamp 100 is changed, both low beam and high beam can be handled. However, when the applied power is changed, the temperature of the electrode 32 tends to deviate from the appropriate range. In this case, if the temperature of the electrode 32 becomes too high or too low, the arc spot becomes unstable and flickering occurs. When flickering occurs, the driver and other people feel uncomfortable.
Furthermore, if the temperature of the electrode 32 becomes too high, the electrode 32 may be consumed excessively, crack cracks may be easily generated in the sealing portion 12, and the life of the discharge lamp 100 may be shortened.

  As a result of the study, the inventor sets the power applied to the discharge lamp 100 during low beam (power during stable lighting) to 24 W or more and 30 W or less, and the power applied to the discharge lamp 100 during high beam (when stable lighting is performed). When the electric power) is set to 32 W or more and 38 W or less, if the thickness dimension (diameter dimension) d of the electrode 32 is set as follows, the occurrence of flickering can be suppressed and the life can be shortened. The knowledge that it can suppress was obtained.

なお、発光部１１の内容積（放電空間１１１の体積）は、２２μＬとした。
放電空間１１１に封入される不活性ガスは、キセノンとした。
金属ハロゲン化物２の組成比は、ＳｃＩ_３：ＮａＩ：ＺｎＩ_２：ＩｎＢｒ＝４５ｗｔ％：４９ｗｔ％：４．９ｗｔ％：０．１ｗｔ％とした。
金属ハロゲン化物２の重量は、０．４ｍｇとした。
電極３２の材料は、タングステンとした。
ロービームの際の印加電力は、２７Ｗとした。
ハイビームの際の印加電力は、３４Ｗとした。 Table 1 is a table for illustrating the relationship between the thickness dimension (diameter dimension) d of the electrode 32, the occurrence of flickering, and the lifetime.

The inner volume of the light emitting unit 11 (the volume of the discharge space 111) was 22 μL.
The inert gas sealed in the discharge space 111 was xenon.
The composition ratio of the metal halide 2 was ScI ₃ : NaI: ZnI ₂ : InBr = 45 wt%: 49 wt%: 4.9 wt%: 0.1 wt%.
The weight of the metal halide 2 was 0.4 mg.
The material of the electrode 32 was tungsten.
The applied power during the low beam was 27 W.
The applied power during the high beam was 34 W.

The suppression of flickering was evaluated by determining the fluctuation rate of illuminance. The illuminance was measured every 0.5 seconds for 5 to 10 minutes after lighting. The illuminance fluctuation rate of 3% or less was indicated by “◯”, and the illuminance fluctuation rate exceeded 3% was indicated by “X”.
In the life evaluation, when the discharge lamp 100 is lit for 2000 hours in the flashing cycle of the EU 120 minute mode and no crack leak occurs in the sealing portion 12, “◯” is given, and crack leakage occurs in the sealing portion 12. In this case, “x” was given.

As can be seen from Table 1, if the thickness dimension (diameter dimension) d of the electrode 32 is represented by the following formula, the occurrence of flicker can be suppressed even if the power applied to the discharge lamp 100 is changed, And it can control that a lifetime becomes short.
That is, it is possible to provide the discharge lamp 100 that can cope with the low beam and the high beam with a simple configuration.
0.24 (mm) ≦ d (mm) ≦ 0.33 (mm)
In Table 1, the applied power in the low beam is 27 W and the applied power in the high beam is 34 W. However, the applied power in the low beam is 24 W or more and 30 W or less, and the applied power in the high beam is 32 W. As described above, the same effect can be obtained even when the power is 38 W or less.

なお、評価試験の条件や評価基準は、表１の場合と同様とした。 Table 2 is a table for illustrating the relationship between the amount of change in the tube current when switching between the low beam and the high beam and the occurrence of flickering.

The evaluation test conditions and evaluation criteria were the same as in Table 1.

As can be seen from Table 2, if the amount of change in the tube current at the time of switching between the low beam and the high beam is 0.3 A or less, the occurrence of flicker can be suppressed even if the power applied to the discharge lamp 100 is changed. .
That is, it is possible to provide the discharge lamp 100 that can cope with the low beam and the high beam with a simple configuration.
The thickness of the electrode 32 is set to 0.24 (mm) ≦ d (mm) ≦ 0.33 (mm), the power applied to the discharge lamp 100 during low beam is set to 24 W or more and 30 W or less, and the high beam If the power applied to the discharge lamp 100 is 32 W or more and 38 W or less, the amount of change in tube current when switching between the low beam and the high beam can be made 0.3 A or less.

なお、評価試験の条件や評価基準は、表１の場合と同様とした。
表３中のＩ（Ａ）は放電ランプ１００に印加する電流、Ｓ（ｍｍ^２）は電極３２の断面積、Ｉ／Ｓ（Ａ／ｍｍ^２）は電流断面積である。 Table 3 is a table for illustrating the relationship between the current cross-sectional area, the occurrence of flickering, and the lifetime.

The evaluation test conditions and evaluation criteria were the same as in Table 1.
In Table 3, I (A) is a current applied to the discharge lamp 100, S (mm ² ) is a cross-sectional area of the electrode 32, and I / S (A / mm ² ) is a current cross-sectional area.

As can be seen from Table 3, if the following expression is satisfied, flickering can be suppressed even when the power applied to the discharge lamp 100 is changed, and the lifetime can be prevented from being shortened. be able to.
That is, it is possible to provide the discharge lamp 100 that can cope with the low beam and the high beam with a simple configuration.
8.0 (A / mm ² ) ≦ I / S (A / mm ² ) ≦ 18.0 (A / mm ² )
The thickness of the electrode 32 is set to 0.24 (mm) ≦ d (mm) ≦ 0.33 (mm), the power applied to the discharge lamp 100 during low beam is set to 24 W or more and 30 W or less, and the high beam In this case, if the power applied to the discharge lamp 100 is set to 32 W or more and 38 W or less, the current sectional area (I / S) can be set within the above range.

Further, according to the knowledge obtained by the present inventors, the arc spot can be stabilized if the distance (interelectrode distance) L1 between the tips of the pair of electrodes 32 is expressed by the following equation. Therefore, it becomes easier to suppress the occurrence of flickering.
3.0 (mm) ≦ L1 (mm) ≦ 3.6 (mm)

  Further, according to the knowledge obtained by the present inventor, the gas enclosed in the closed space formed between the inner tube 1 and the outer tube 5 is nitrogen, argon, a mixed gas of nitrogen and argon, and the gas is sealed. The pressure is preferably 0.1 atm or less at room temperature (25 ° C.). In this way, the temperature of the light emitting unit 11 can be within an appropriate range. Therefore, it is possible to suppress flickering and shortening of the life.

  Further, according to the knowledge obtained by the present inventors, it is preferable that the gas enclosed in the discharge space 111 is xenon, and the gas sealing pressure is 10 atm or more and 15 atm or less at room temperature (25 ° C.). In this way, the arc spot can be stabilized, and flickering can be easily suppressed.

(Vehicle lamp and vehicle lighting device)
FIG. 2 is a schematic diagram for illustrating the vehicular lamp 200 and the vehicular lighting device 300. FIG. 3 is a block diagram of the vehicular lighting device 300.
FIG. 2 shows a case where the discharge lamp 100 is attached so that the pair of electrodes 32 provided on the discharge lamp 100 are horizontal. That is, the case of the discharge lamp 100 that is horizontally lit is illustrated.

As shown in FIGS. 2 and 3, the vehicular illumination device 300 includes a discharge lamp 100, a lighting circuit 301, and a changeover switch 302.
As shown in FIG. 2, the vehicular lamp 200 is provided with a vehicular illumination device 300, a housing 202, a light shielding control plate 203, and a lens 204.
The casing 202 reflects light emitted from the discharge lamp 100 to the front end side. The housing 202 is made of, for example, a metal having a high reflectance. A space is provided inside the housing 202, and the inner surface has a parabolic shape.

The ends on the front end side and the rear end side of the housing 202 are open.
The discharge lamp 100 is attached to the housing 202. The socket 102 of the discharge lamp 100 is attached in the vicinity of the opening on the rear end side of the housing 202. The burner 101 of the discharge lamp 100 is located in the space inside the housing 202.
That is, 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 inside the housing 202 and on the front end side of the burner 101 and on the lower end side of the burner 101.
The light shielding control plate 203 is made of a light shielding material such as 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 collects the light directly incident from the discharge lamp 100 and the light reflected and incident by the casing 202 to form a desired light distribution.

The lighting circuit 301 is a circuit for starting the discharge lamp 100 and maintaining lighting.
As shown in FIG. 3, the lighting circuit 301 can 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 the input side of the lighting circuit 301. The discharge lamp 100 is electrically connected to the output side of the lighting circuit 301.

  The igniter circuit 301a includes, for example, a transformer, a capacitor, a resistor, a semiconductor element, and the like. The igniter circuit 301 a generates a high-pressure pulse of about 30 kV and applies it to the discharge lamp 100. By applying a high-pressure pulse of about 30 kV to the discharge lamp 100, dielectric breakdown occurs between the pair of electrodes 32, and discharge occurs. That is, the discharge lamp 100 is started by the igniter circuit 301a.

The ballast circuit 301b maintains the lighting of the discharge lamp 100 started by the igniter circuit 301a.
The ballast circuit 301b includes a low beam ballast circuit and a high beam ballast circuit. Each of the low beam ballast circuit and the high beam ballast circuit includes, for example, a DC / DC conversion circuit, a DC / AC conversion circuit, a current / voltage detection circuit, a control circuit, and the like. The low beam ballast circuit applies 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 power of 32 W or more and 38 W or less to the discharge lamp 100 during stable lighting.

  A changeover switch 302 switches between a low beam and a high beam based on an input by a driver or the like. That is, the changeover switch 302 switches between a low beam ballast circuit and a high beam ballast circuit based on an input by a driver or the like. Then, predetermined power is supplied to the discharge lamp 100 from the low beam ballast circuit or the high beam ballast circuit switched by the changeover switch 302.

The vehicle lighting device 300 illustrated in FIGS. 2 and 3 includes the discharge lamp 100 and an igniter circuit 301a incorporated in the case. As another circuit, the ballast circuit 301b and the changeover switch 302 are igniter circuits. Although it is electrically connected to 301a, it is not limited to such a configuration.
For example, the vehicular lighting device 300 includes an igniter circuit 301a and a ballast circuit 301b incorporated in one case, and a discharge lamp 100. As another circuit, the changeover switch 302 is electrically connected to the ballast circuit 301b. You may connect.
The vehicle lighting device 300 may include an igniter circuit 301a, a ballast circuit 301b, and a changeover switch 302 incorporated in one case, and these may be electrically connected to the discharge lamp 100.
The vehicle lighting device 300 may include only the discharge lamp 100, and the igniter circuit 301a, the ballast circuit 301b, and the changeover switch 302 may be electrically connected to the discharge lamp 100 as separate circuits.

  As mentioned above, although several embodiment of this invention was illustrated, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and equivalents thereof. Further, the above-described embodiments can be implemented in combination with each other.

  DESCRIPTION OF SYMBOLS 1 Inner tube, 2 Metal halide, 5 Outer tube, 11 Light emission part, 12 Sealing part, 32 Electrode, 100 Discharge lamp, 101 Burner, 102 Socket, 111 Discharge space, 200 Vehicle lamp, 202 Case, 300 Vehicle Lighting device, 301 lighting circuit, 301b ballast circuit, 302 selector switch

Claims (7)

A light emitting part having a discharge space in which a metal halide and an inert gas are enclosed;
A pair of electrodes protruding into the discharge space and arranged to face each other at a predetermined distance;
A discharge lamp comprising:
The power applied to the discharge lamp during low beam is 24 W or more and 30 W or less, and the power applied to the discharge lamp during high beam is 32 W or more and 38 W or less,
A discharge lamp that satisfies the following formula when the thickness dimension of the electrode is d (mm).
0.24 (mm) ≦ d (mm) ≦ 0.33 (mm)   The discharge lamp according to claim 1, wherein a change amount of the tube current at the time of switching between the low beam and the high beam is 0.3 A or less. 3. The discharge lamp according to claim 1, wherein a current applied to the discharge lamp is I (A) and a cross-sectional area of the electrode is S (mm ² ), and the following expression is satisfied.
8.0 (A / mm ² ) ≦ I / S (A / mm ² ) ≦ 18.0 (A / mm ² ) A discharge lamp according to any one of claims 1 to 3;
A lighting circuit electrically connected to the discharge lamp and having an igniter circuit;
A vehicle lighting device comprising: A discharge lamp according to any one of claims 1 to 3;
A lighting circuit electrically connected to the discharge lamp and having an igniter circuit, a low beam ballast circuit, and a high beam ballast circuit;
A vehicle lighting device comprising:   6. The vehicle lighting device according to claim 5, further comprising a changeover switch for switching between the low beam ballast circuit and the high beam ballast circuit. A vehicular illumination device according to any one of claims 4 to 6;
A housing for mounting a discharge lamp provided in the vehicle lighting device;
A vehicular lamp provided with

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