WO2006005264A1

WO2006005264A1 - Double arc xenon gas metal halide lamp for automobiles and arc tube thereof

Info

Publication number: WO2006005264A1
Application number: PCT/CN2005/001040
Authority: WO
Inventors: Zheng-Ming Yang; Guang-Yi Gao; Ming Zhang; Guo-Sheng Chai
Original assignee: Guang Dong Bright Star Light & Electricity Co., Ltd.
Priority date: 2004-07-13
Filing date: 2005-07-13
Publication date: 2006-01-19

Abstract

The present invention discloses a high intensity electrical discharge lamp arc tube and a high intensity electrical discharge lamp for automobiles. The said arc tube is similarly a globe shape, a ellipsoid shape or a tube shape and is filled with the substance that can be ionized. A first neck portion and a second neck portion are positioned on the two ends of the arc tube, respectively, and the diameters of the neck portions pinch, and there is an angle of 180 degree between the two neck portions. Two pairs of the electrodes are provided in the arc tube. The said two pairs of the electrodes are connected to the outlet of the ballast throughlead wires. Wherein one pair of the electrodes forms an arc that lies in or is vertical to the axis of the lamp holder, and the other pair of the electrodes depart from the axis of the lamp holder. The high intensity electrical discharge lamp for automobiles may be composed of the said arc tube together with an enclosure and a lamp holder. The present invention put the two pairs of the electrodes in the same arc tube and the positions of the arcs (light sources) can be exchanged by exchanging the two pairs of the electrodes which can discharge. So the shape of the beams of the emitted lights and the illumination distribution can be regulated,and the function of switching between the high beam and the dipped headlight can be perfectly realized. The functions thereof are same as the ones of the common dour e-filament halogen-tungsten lamp 9004, 9007 or H4, and can be used for improving the illumination efficacy instead of the common lamps.

Description

Double arc xenon gold for vehicle | § lamp arc tube and lamp

[Technical Field]

The invention relates to a high-intensity discharge lamp arc tube and a discharge lamp, in particular, two pairs of electrodes are arranged in one arc tube, and a double arc xenon metal halide lamp arc tube which can be generated between any pair of electrodes, and The arc tube is equipped with a casing and a suitable lamp head for a vehicle, and a Xenon metal halide lamp having a high beam low beam function.

【Background technique】

A single-ended, high-intensity discharge lamp for a vehicle with a base is usually constructed as: a high-strength gas discharge arc tube made of high-purity quartz glass and filled with an ionizable substance in a spherical or ellipsoidal shape, an arc tube The utility model comprises a pair of electrodes, wherein the arc tube is provided with a neck portion which is contracted and sealed at a 180-degree angle with each other, and the two neck bodies respectively support one electrode, and the electrode lead passes through the center of the neck body. The arc tube can be used directly as a light source. In order to ensure the stability of the operation of the arc tube, the arc tube and the outside of the neck may be provided with a cover made of a quartz material that absorbs ultraviolet rays. The cover is usually airtight, and both ends thereof are contracted by the nozzle and the neck of the arc tube. Partially sealed connection. The lead of the first electrode adjacent to the lamp cap is led through the small hole in the lamp cap, and the second electrode lead away from the lamp cap is led out from the outside of the casing toward the lamp cap through the small hole in the lamp cap. This type of discharge lamp can be used to provide a fixed illumination beam __high beam or low beam when used in automotive headlight illumination. If both the high beam and low beam are emitted by a xenon metal halide lamp, two separate lighting systems including discharge lamps, ballasts and other accessories and accessories must be used. The system is complex and costly, and a high-voltage trigger pulse is generated when switching, and a certain dark time zone exists.

The object of the present invention is to achieve simultaneous remote and low beam illumination with a single xenon metal halide lamp and to easily switch.

[Summary of the Invention]

The object of the present invention is to provide a xenon metal halide arc tube and a lamp capable of generating two arcs at different positions in the same discharge lamp, and can be easily switched to each other, instead of having the functions of low beam and high beam. Used as a traditional halogen lamp for automotive headlamps, such as H4, 9004 and 9007.

Solving the above problem is first of all a theoretical breakthrough. It is generally believed that it is impossible to create two independent arcs in the same discharge vessel. Therefore, it has never been assumed that two discharge arcs are fabricated in the same bulb. The invention is negatively confirmed: In this view, a discharge lamp in which two pairs of electrodes are disposed at appropriate positions in the same bulb is designed and fabricated, and arcs can be generated at the two positions and can be switched to each other. The technical proposal is as follows: The present invention is provided with an axially symmetric or slightly flat arc tube which is spherical or ellipsoidal and filled with an ionizable substance, and the two ends of the arc tube are respectively provided with a diameter contraction of 180 degrees to each other and a sealed first neck body and a second neck body. There are two pairs of electrodes in the arc tube. The two pairs of electrodes can be implemented in the following three ways: (1) (see Fig. 1) Two electrodes (3a, 3b) and a second end are provided at the first end of the arc tube. Two electrodes (4a, 4b) are provided, and the two electrodes at the first end and the two electrodes at the second end are respectively electrically connected to the corresponding outer leads passing through the lamp cap through the electric conductors in the corresponding end necks. The arc-shaped diameter formed by the pair of electrodes (3b, 4b) substantially coincides with the axis of the cap, and the other pair of electrodes (3a, 4a) are offset from the axis of the cap, at a near-ground side below the pair of electrodes (3b, 4b). (2) (See Fig. 3, Fig. 4) Two electrodes (3a, 3b) are provided at the first end of the arc tube and two electrodes (4a, 4b) are provided at the second end, two electrodes and a first end The two ends of the two electrodes are respectively electrically connected to the corresponding outer leads passing through the lamp cap through the electric conductors inside the corresponding end neck body, wherein the arc formed by the pair of electrodes (3b, 4b) is orthogonal to the lamp shaft and passes through the plane of the lamp cap shaft. The arc formed by the other pair of electrodes (3a, 4a) is orthogonal to the base of the lamp but is near the ground below the base of the lamp. (3) (See Fig. 5, Fig. 6) The arc tube is provided with three electrodes of a first end a electrode 3a, a first end b electrode 3b and a second end a electrode 4a, which constitute two electrode pairs (3a, 3b) and (3b, 4a). One pair of electrodes (3a, 3b) is on the axis of the base 10 near the base of the lamp, and the other pair of electrodes (4a, 3b) is on the axis of the lamp head away from the base of the lamp. The center point between the two pairs of electrodes is from the reference surface of the base of the lamp cap. The distance is the position of the light source required for the high beam and low beam of the vehicle illumination lamp (such as H4 tungsten halogen lamp, etc.), the first end a electrode, the first end b electrode and the second end a electrode three electrodes in the arc tube respectively The electrical conductors in the corresponding end necks are electrically connected to the corresponding outer leads.

The arc tube of the present invention is provided with two pairs of electrodes, such as the above (1) mode and the (2) mode (3a, 4a) and (3b, 4b) two pairs of electrodes or the third (3) mode (3a, 3b) and (3b, 4a). When an electric arc is formed by turning on a power source between a pair of electrodes, an arcuate bright light source is formed between the pair of electrodes. When the power is transferred between the other pair of electrodes, the arc is immediately transferred between the pair of electrodes, and a zero transition time bright spot switching is quickly achieved.

An outer casing 7 is provided outside the arc tube and the outer neck. The outer casing 7 may be a UV quartz tube of constant diameter, or may have a bulb of a shape similar to that of the arc tube at a portion corresponding to the arc tube in the middle. The lower portion of the outer casing 7 is sealed with the first neck body 2a of the arc tube 1 through its constricted portion 7a, and the upper end of the second neck body 2b is expanded into a flared conical surface 2c, and the outer edge of the flared conical surface 2c is sealed with the casing 7, or The port on the casing shrinks and seals with the second neck. The arc tube of the invention is equipped with a lamp cap 10 and the like to form a double arc xenon metal halide lamp, which can be directly fixed on the lamp cap, that is, the first end of the arc tube is directly embedded in the central column groove of the lamp cap, or Secure with a clamping ring. The clamping ring 8 can be composed of two metal strips, or can be formed of a single metal strip, and is placed on the outer wall of the lower portion of the outer casing 7 at an appropriate height from the base. One end of not less than three support pins 9 is embedded in the end face of the lamp cap and fixed to the lamp cap, and the other end is fixedly connected to the corresponding flap of the clamp ring. The two pairs of electrodes provided in the arc tube 1 are connected to the output of the dedicated electronic ballast through a wire, wherein the first end electrode lead wire is connected with the two outer wire wires 5a, 5b of the cap 10 passing through the same end, The lead wire of the two-terminal electrode is folded toward the lamp cap, and a sleeve can be provided outside and electrically connected to the outer wire passing through the lamp cap 10.

In order to obtain a better light shape and reduce glare, a light shielding cap 13 or a light absorbing layer 14 may be applied to the top of the lamp of the present invention as shown in Figs. The hat is also insulated from high pressure.

The invention cooperates with the corresponding circuit and relay for realizing arc switching, and can well realize the high beam and low beam switching functions of the automobile. Its functions are the same as those of the commonly used double filament halogen lamps 9004, 9007 and H4, and can be directly replaced. Since the low beam and the high beam source are combined in one lamp, the same lamp can be turned on in the same lamp with the same electronic ballast and the circuit shown in FIG. 1 or 12, and the power is switched off and closed. Thereby, the low beam, high beam switching speed and beam quality are improved, and the generation of high voltage during switching is avoided, and the cost is also reduced.

[Description of the Drawings]

1 is a schematic view showing the structure of a xenon metal halide lamp for a double arc vehicle with two pairs of electrodes according to an embodiment of the present invention;

Figure 2 is a top plan view of Figure 1;

3 is a schematic structural view of a xenon metal halide lamp arc tube for a dual arc vehicle with two pairs of electrodes according to Embodiment 1 of the present invention; FIG. 4 is a side view of the structure of FIG.

5 is a schematic structural view of a xenon metal halide lamp arc tube for a vehicle with three pairs of electrodes according to Embodiment 2 of the present invention; FIG. 6 is a structural view of the arc tube shown in FIG. 5 after the lamp cap is mounted;

Figure 7 is a schematic view showing the structure of a clamping ring composed of two metal strips according to the present invention;

Figure 8 is a schematic view showing the structure of a clamping ring composed of the entire metal strip of the present invention;

Figure 9 is a schematic view showing an embodiment of a discharge lamp having a black light-shielding coating on the upper end;

Fig. 10 is a structural schematic view showing an embodiment of a discharge lamp having a light shielding cap on the upper end of the present invention. FIG. 11 is a schematic diagram of a circuit for implementing mutual switching between two arcs according to Embodiment 1 of the present invention; FIG.

Fig. 12 is a circuit diagram showing the realization of switching between two arcs according to Embodiment 2 of the present invention.

Description of the reference numerals

The arc tube 1, the first neck body 2a, the second neck body 2b, the flared conical surface 2c, the first end electrodes 3a, 3b in the arc tube, the second end electrodes 4a, 4b in the arc tube, the wires 5a, 5b, 6, 6a, 6b, outer casing 7, outer casing 7, lower contraction portion 7a, clamping ring 8, support pin 9, lamp cap 10, lead 11, l la, l ib, sleeve 12, 12a, 12b, shading Cap 13, light absorbing layer 14, electronic ballast 15, battery 16, circuit switches S1, S2, active contacts S3, S4, S5 of the relay, fixed contacts Cl, C2, C3, C4, C5, C6, resistor Rl , R2, R3, R4, R5, R6, electrolytic contact coils for active contacts TS3, TS4, TS5

【detailed description】

The content of the present invention will be further described below with reference to the accompanying drawings and embodiments:

Example 1

As shown in Figures 1, 3 and 4, the arc tube 1 sealed in this embodiment is an axisymmetric tube-shaped or slightly flat-shaped spherical or ellipsoidal bulb, and the arc tube is provided at an angle of 180 degrees to each other. The first neck body 2a and the second neck body 2b of the diameter shrinkage seal, the first end electrodes 3a, 3b and the second end electrodes 4a, 4b in the arc tube are respectively led out by the molybdenum piece and the molybdenum rod sealed in the neck body at the corresponding ends And the lead wires of the first end electrodes 3a, 3b in the arc tube are electrically connected to the two wires 5a, 5b of the cap 10 passing through the same end, and the lead wires l la, l ib of the two electrodes at the second end are folded toward the cap And electrically connected to the outer leads 6a, 6b passing through the base 10, and respectively through the outer lead through the base, wherein the outer leads l la, l ib are respectively sleeved with ceramic sleeves 12a, 12b. The line connecting the pair of electrodes 3b, 4b is at the axis of the lamp head, and the line connecting the other pair of electrodes 3a, 4a is offset from the axis of the lamp head to the ground side. The arc tube can be used directly as a light source, or a housing 7 can be provided outside the arc tube and the neck. The lower portion of the outer casing 7 is sealed with the first neck body 2a of the arc tube through its constricted portion 7a, and the outer surface of the second neck body 2b is formed by a flared conical surface 2c, and the outer edge of the conical surface 2c is sealed with the outer casing 7, or The upper end of the outer casing 7 is crimped and connected to the second neck.

The lamp cap 10 is an integrated structure which is formed by hot pressing of a high temperature resistant and high voltage resistant polymer insulating material, and the arc tube first neck body 2a and the extending portion of the casing 7 surrounding it are embedded in the end face of the lamp cap 10 slightly off from the center portion. Shape the slot and ensure that the electrode pairs 3b, 4b are on the extension of the base axis to provide a low beam source, and the off-axis is appropriate The position of the electrode pairs 3a, 4a provides a high beam source.

The outer casing 7 is tightly sealed by the first neck portion 2a of the arc tube by the portion diametrically contracted at the lower portion 7c. The metal clamping ring 8 is sleeved on the outer wall of the non-contracted portion of the casing at an appropriate distance above the lamp cap 10. The metal clamping ring is evenly disposed with four outwardly projecting splicing wings, and the splicing wing holes are respectively sleeved at the protruding ends of the corresponding supporting pins 9 embedded in the end faces of the lamp caps and are spliced and connected. The respective support pins 9 connected at the upper end to the clamp ring 8 can be directly embedded in the base 10, or can be fixedly connected by a reinforcing ring at a portion close to the root. The embedded end of the support pin is evenly arranged on the end face of the lamp cap concentric with the casing and having a radius larger than the radius of the casing. For structural stability, the support pin should normally be no less than three.

As shown in Figures 7 and 8, the clamping ring 8 can be formed by a combination of four quarter-circular arc-shaped strip-shaped metal sheets, each of which has an outwardly extending end and a semi-circular opening at the outer end. The semi-twisting wing of the welding hole, the four-section curved metal band constitutes the outer wall of the closed clamping ring and the four supporting pins are respectively inserted into the corresponding welding wing holes of the clamping ring, and are weldedly connected with the connecting wing. The clamping ring can also be a metal ring composed of two semi-annular metal sheets of the same shape or an entire metal strip, and the lamp can be directly embedded in the center of the lamp cap. The groove is fixed with glue.

The outer casing 7 may be a tubular tube that blocks the ultraviolet radiation, and may also be a spherical bulb corresponding to the spherical bulb of the arc tube and nearly parallel to the bulb surface of the arc tube. Compared with the straight tubular casing shown in Fig. 5, when the spherical outer casing is used, the distance between the parts of the arc tube and the outer casing is uniform, the temperature is uniform, the thermal stability is good, and the light directly radiated in the radial direction is also more, and in the arc tube There is less reflection between the outer casing and the outer casing, so the light utilization rate is higher and the glare is less.

In order to obtain a better light shape and reduce glare, a light shielding cap 13 or a light absorbing layer may be applied to the top of the lamp of the present invention.

14, as shown in Figures 9, 10. The hat is also insulated from high pressure.

The position, shape and switching of the spot of the above arc tube are the same as those of the conventional double filament halogen tungsten lamp 900. The lamp cap used in the present invention is slightly improved with reference to the 9007 lamp head, and the lead wires of the two pairs of electrodes are pre-wired from the middle of the lamp cap. The lead hole is taken out, so that the invention can directly replace the 9007 lamp in the original 9007 lamp and maintain the same beam shape, orientation and light distribution, but the color temperature, luminous flux and life are greatly improved. The base used in the present invention can also be designed in other forms but with the same efficacy.

In this embodiment, a circuit for realizing mutual switching between two arcs as shown in FIG. 11 is used, and the steam can be well realized. The camera's high beam and low beam switching functions.

The first end electrodes 3a, 3b of the arc tube 1 are connected in series with the resistors R1, R3, respectively, and are connected together directly to the output end A of the electronic ballast 15, and the second end electrodes 4a, 4b of the arc tube 1 are connected in series The resistors R2 and R4 are connected together and directly connected to the output terminal B of the electronic ballast 15; the fixed contacts C3, Cl, C4, C2 of the relay are respectively connected to the electrodes 3a, 3b, 4a, 4b, and two of the relays The movable contacts S3, S4 are respectively connected to the two output terminals A, B of the electronic ballast 15; the input ends of the relay coil and the electronic ballast 15 are respectively connected with switches S2, SI, and then connected in parallel and connected to the battery 16 The output.

When the relay switch S2 is turned off, the movable contacts S3, S4 are short-circuited with the fixed contacts Cl, C2, respectively. When the ballast switch S 1 is turned on, a high voltage pulse of 23 kV is immediately applied between the electrode pairs 3a, 4a and 3b, 4b in the arc tube and triggers an arc, but due to the presence of the resistors R1, R2, the arc can only be stably established. Between the electrodes 3b, 4b. When the relay switch S2 is turned on, the movable contacts S3, S4 are disengaged from the fixed contacts Cl, C2 and shorted to the fixed contacts C3, C4, and the arc is immediately transferred between the electrodes 3a, 4a. When the arc is switched, although the fixed contact of the relay is temporarily separated from the movable contact, the circuits of the electrodes 3a, 4a and the electrodes 3b, 4b are not cut off, and the arc does not extinguish, but migrates in the arc tube. Therefore, the ballast does not generate a new trigger pulse voltage, and no spark is generated when the contacts are separated, thereby ensuring stable operation of the relay contacts for a long life.

Example 2

The arc tube 1 sealed in this embodiment has an oblong spherical body and is filled with an ionizable substance. The two ends of the arc tube 1 are respectively provided with a first neck body 2a and a second neck body which are contracted and sealed at a 180-degree angle. 2b, the arc tube 1 and the first neck body 2a and the second neck body 2b are provided with an outer casing 7 surrounding the outer casing, and the first end a electrode 3a, the first end b electrode 3b and the second portion are disposed in the arc tube 1. The three electrodes of the terminal electrode 4a are respectively led out from the molybdenum piece and the molybdenum rod sealed in the neck body by the corresponding end, and the first end a electrode 3a and the first end b electrode 3b in the arc tube 1 respectively and the outer lead passing through the lamp cap 10 5a, 5b are electrically connected, the second end electrode 4a is electrically connected to the second end wire 11 of the folding base 10, and the second end wire 11 is provided with a ceramic sleeve 12 outside, and is taken out through the lamp cap 10 through the outer lead 6. The lower portion of the outer casing 7 is sealed to the first neck body 2a of the arc tube 1 by the contraction portion 7a at the lower end thereof, the flared conical surface 2c formed at the upper end of the second neck body 2b, and the outer edge of the flared conical surface 2c are fused with the outer casing 7 The connection is sealed, or the upper end of the outer casing 7 is crimped and connected to the second neck 2b.

The three electrodes of the first end a electrode 3a, the first end b electrode 3b and the second end electrode 4a of the arc tube 1 constitute two pairs of electrodes, wherein the (4a, 3b) electrode pair center point is on the lamp head axis 31.7 mm from the base of the lamp head Electrode pair (3a, 4a) The center point is located 25 mm from the reference plane of the base of the lamp head on the axis of the lamp head, which is equivalent to the position of the light source required for the low beam and high beam of the H4 tungsten halogen lamp.

The arc tube 1 can be installed on the corresponding lamp cap 10 to form the same renewed lamp type as the H4 tungsten halogen lamp, and the lamp cap 10 is an integrated structure formed by hot pressing of high temperature resistant, high voltage resistant ceramic or polymer insulating material. The first neck 2a of the arc tube 1 and the extension of the outer casing 7 surrounding it are embedded below the end face of the base 10 and ensure that all three electrodes are on the axis extension of the base 10.

The neck body of the arc tube 1 is tightly sealed by the first neck portion 2a of the arc tube 1 through the diameter contraction portion 7a of the lower portion of the outer casing 7. The metal fixing ring 8 of the fixed arc tube 1 is sleeved on the outer wall of the non-contracted portion of the outer casing 7 at an appropriate distance above the lamp cap 10. At least one end of the supporting pin 9 is embedded in the end surface of the lamp cap 10 and fixedly connected with the lamp cap 10, and the supporting pin The other ends of the 9 are fixedly connected to the splicing wings on the fixing ring 8, respectively.

The fixing ring 8 is composed of four quarter-circle arc-shaped strip-shaped metal sheets, and each end of the metal sheet is provided with welding wings which are outwardly extended and have semi-circular open welding holes at the outer ends, and four arcs. The metal strip forms a closed retaining ring 8 that holds the outer wall of the casing. The metal fixing ring 8 is provided with four outwardly extending splicing wings, and the splicing wing holes are respectively sleeved at the protruding ends of the corresponding supporting pins 9 embedded in the end faces of the lamp cap 10 and weldedly connected. The embedded end of the support pin 9 is evenly arranged on the end face of the base 10 which is concentric with the outer casing 7 and has a radius larger than the radius of the outer casing 7. For structural stability, the support pin 9 is usually not less than three. The fixing ring 8 may be composed of two semi-annular metal sheets of similar shape or directly formed of a metal ring of only one opening of a desired size formed by the entire metal strip, and the lamp may also be directly embedded in the center of the lamp cap. The cylindrical groove is also fixed by glue.

The position, shape and switching of the two arc centers of the arc tube 1 are the same as those of the conventional double filament halogen lamp H4. The lamp cap 10 used in the present invention is slightly improved with reference to the H4 lamp head, and the leads of the three electrodes are from the middle of the lamp cap 10. The holes are taken out in the reserved holes, so that the H4 tungsten halogen lamps can be directly replaced from the H4 lamps and the beam shape, orientation and light distribution are maintained identically, but the color temperature, luminous flux and lifetime are greatly improved.

The circuit structure used in this embodiment is as shown in FIG. 12, and the high beam and low beam switching functions of the automobile can be well realized.

The first end a electrode 3a and the second end electrode 4a of the arc tube 1 are connected in series with the resistors R6 and R5, respectively, and are connected together and directly connected to the first output end of the electronic ballast 15, and the first end b electrode 3b is directly connected. To the second output of the electronic ballast 15; the fixed contacts C5, C6 of the relay are respectively connected to the electrodes 4a, 3a, and the movable contact S5 of the relay is connected to the electric The first output of the sub-ballast 15; the relay coil is connected in series with a switch S2, and then connected in parallel with the input of the electronic ballast 15, and then connected to the output of the battery 16 via the switch S1.

When the relay switch S2 is open, the movable contact S5 is short-circuited to the fixed contact C5. When the switch S 1 is turned on, a high voltage pulse of 23 kV is immediately applied between the electrode pairs 3a, 3b and 4a, 3b in the arc tube and triggers an arc, but due to the presence of the resistor R6, the arc can only be stably established at the electrodes 4a, 3b. between. When the relay switch S2 is turned on, the movable contact S5 is disengaged from the fixed contact C5 and short-circuited with the fixed contact C6, and the arc is immediately transferred between the electrodes 3a, 3b. When the arc is switched, although the fixed contact of the relay is temporarily separated from the movable contact, the circuits of the electrodes 3a, 3b and the electrodes 4a, 3b are not cut, the arc is not extinguished, but migrates in the arc tube. Therefore, the ballast does not generate a new trigger pulse voltage, and no spark is generated when the contacts are separated, thereby ensuring stable operation of the relay contacts for a long life.

Claims

Claim

1. A double arc xenon metal halide arc tube, which is spherical, ellipsoidal or tubular and filled with an ionizable substance, and the two ends of the arc tube (1) are respectively provided with a diameter contraction and sealing at an angle of 180 degrees to each other. The first neck body (2a) and the second neck body (2b) are characterized in that: the arc tube (1) is provided with two pairs of electrodes composed of three or four tungsten-like filaments, the two pairs of electrodes The power is turned on by an external wire, and one of the pair of electrodes is in a discharge state to form an arc, and the other pair of electrodes is in a discharge stop state, and the discharge between the two can be switched by an external circuit.

2. The double arc xenon metal halide lamp arc tube according to claim 1, wherein: the two pairs of electrodes in the arc tube (1) are a first end a electrode (3a) and a first end b electrode ( 3b), a second end a electrode (4a), a second end b electrode (4b), forming two electrode pairs (3a, 4a) and (3b, 4b), wherein the electrode pair (3b, 4b) is at the base (10) On the extension line of the axis, the electrode pair (3a, 4a) is offset from the axis of the lamp cap (10) and is on the near ground side of the (3b, 4b) electrode pair.

3. The double arc xenon metal halide lamp arc tube according to claim 1, wherein: the two pairs of electrodes in the arc tube (1) are a first end a electrode (3a) and a first end b electrode ( 3b), a second end a electrode (4a), a second end b electrode (4b), forming two electrode pairs (3a, 4a) and (3b, 4b), two pairs of electrodes (3a, 4a) and (3b, 4b) are perpendicular to the lamp axis, wherein the arc between the electrode pairs (3b, 4b) is orthogonal to the lamp axis and at the same level. (3a, 4a) The arc between the electrode pairs is near the ground below the lamp axis.

The double arc xenon metal halide lamp arc tube according to claim 1, wherein: the two pairs of electrodes in the arc tube (1) are a first end a electrode (3a) and a first end b electrode ( 3b) and second terminal electrode (4a) two pairs of electrodes composed of three electrodes, wherein a pair of electrodes (3a, 3b) are located near the axis of the lamp cap (10) near the lamp cap (10), and the other pair of electrodes (4a, 3b) It is located on the axis of the lamp cap (10) away from the lamp cap (10) end, and the arc formed by the two forms a low beam and a high beam light source, respectively.

The double arc xenon metal halide lamp arc tube according to any one of claims 1 to 4, characterized in that: the arc tube (1) and the first neck body (2a) and the second neck body (2b) An outer casing (7) surrounding the casing is provided; the upper end of the second neck body (2b) is flared (2c), and the outer edge of the flared conical surface (2c) is sealed with the outer casing (7).

6. The double arc xenon metal halide arc tube according to claim 5, wherein: the shape of the arc tube is an axisymmetric tube shape, a slightly flattened spherical or ellipsoidal shape, and the cover (7) The portion corresponding to the arc tube in the middle has a bulb of a shape similar to that of the arc tube.

A double arc xenon metal halide lamp using the double arc xenon metal halide lamp arc tube according to any one of claims 1 to 4, comprising an arc tube (1) filled with an ionizable substance, and a lamp cap (10). The two ends of the arc tube (1) are respectively provided with a first neck body (2a) and a second neck body (2b) which are respectively contracted and sealed at an angle of 180 degrees, and are characterized in that: the arc tube (1) is provided There are two pairs of electrodes, which are connected to the output of the dedicated electronic ballast through wires, wherein the first end electrode lead wires in the arc tube are electrically connected with the two outer wires of the lamp cap (10) passing through the same end, second The lead wire of the terminal electrode is folded toward the lamp cap and electrically connected to the outer lead passing through the lamp cap (10).

8. The double arc xenon metal halide lamp according to claim 7, wherein: the arc tube and the outer surface of the neck body are provided with a casing (7) surrounding the lamp body; and the outer wall of the lower part of the casing is fixed at a certain height from the lamp cap. Holding ring (8), not less than three support pins (9) have one end embedded in the end face of the lamp cap and fixedly connected with the lamp cap, and the other end is fixedly connected with the welding wing on the clamping ring (8).

9. The double arc xenon metal halide lamp of claim 8, wherein: the top of the double arc xenon metal halide lamp is provided with a light shielding cap (13).

The double arc xenon metal halide lamp according to claim 8, wherein the top of the double arc xenon metal halide lamp is coated with a light absorbing coating (14).