JPH09204801A - Vehicle lamp having a discharge bulb - Google Patents

Abstract

(57) Abstract: In a vehicle lamp having a discharge bulb, electromagnetic waves emitted from the discharge bulb and electromagnetic waves emitted from a connector or a cord connecting the discharge bulb and a lighting circuit affect an electronic device of a vehicle. May be affected. A discharge bulb 5 attached to a reflector 3.
The connector 10 connected to the socket 5a is covered with a metal cover 101 as a conductive coating, and the discharge bulb 5 is shielded by this metal cover to suppress the emission of electromagnetic waves. Further, the cord 19 connecting the connector 10 and the lighting circuit has a shielded wire structure to prevent electromagnetic wave emission from this.
Further, a shade 18 attached to the front side of the discharge bulb 5
Is formed of a conductive material and covers the front of the discharge bulb 5, thereby suppressing the emission of electromagnetic waves in this direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp suitable for use in a headlight of an automobile, and more particularly to a vehicular lamp in which a discharge lamp is used as a light source to prevent the influence of electromagnetic waves.

[0002]

2. Description of the Related Art In recent years, as a headlight of an automobile, application of a lamp using a discharge bulb as a light source, which has good luminous efficiency and color rendering properties and has a long life, has been studied. However, since this type of lamp requires a high voltage to generate discharge at the discharge bulb, it is necessary to attach a lighting circuit to the vehicle to boost the on-vehicle battery voltage to the required high voltage. There is. Since a high voltage is generated on the secondary side of this lighting circuit, it is required to make the wiring on the secondary side as short as possible for safety reasons.Generally, the lighting circuit is integrated into the body of the lamp. To be equipped.

On the other hand, in order to reduce the size of the lamp, that is, to reduce the size of the lamp body, in a lamp that requires a reflector optical axis adjustment mechanism such as a headlight, the reflector optical axis adjustment movement is performed inside the lamp body. It is necessary to reduce the size of the lamp body after securing the necessary area for the lighting. Therefore, in this type of lamp, it becomes difficult to secure a space for mounting the above-mentioned lighting circuit inside the lamp body, and the lighting circuit must be mounted outside the lamp body.

[0004]

However, when the lighting circuit is provided outside the lamp body, electromagnetic waves caused by the high voltage generated in the lighting circuit are radiated to the outside, and the electromagnetic waves are emitted as noise to various electronic devices of the automobile. It will affect the normal operation of these electronic devices. For example,
This causes noise on the radio or mixes noise in the signal system of the microcomputer installed in the automobile, causing so-called EMI failure. This is because when the lighting circuit is equipped inside the lamp body, the film such as aluminum formed on the inner surface of the lamp body functions as a shield film, and the electromagnetic waves emitted from the lighting circuit are radiated to the outside of the lamp body. However, it is also one of the causes that the shielding effect cannot be obtained by mounting the lighting circuit outside the lamp body.

For this reason, the lighting circuit is housed in a metal case or the like having a shielding effect to prevent the emission of electromagnetic waves, but the cord connecting the lighting circuit and the discharge tube is extended outside the lamp body. Therefore, the electromagnetic wave is emitted from this code, and it becomes difficult to prevent the electromagnetic wave from being emitted. Further, since there is also a radiation of electromagnetic waves from the connector portion connecting the cord and the discharge bulb and the discharge bulb itself, it is required to prevent the radiation of these electromagnetic waves.

An object of the present invention is to EM the electromagnetic waves emitted from a vehicle lamp using such a discharge bulb as a light source.
It is to provide a vehicular lamp that can be downsized while preventing the I obstacle.

[0007]

SUMMARY OF THE INVENTION A vehicular lamp of the present invention comprises:
It is characterized in that the connector attached to the socket of the discharge bulb installed inside the lamp body is covered with a conductive coating, and the discharge bulb is shielded by this conductive coating. Also,
A cord for electrically connecting the discharge bulb and a lighting circuit for lighting the discharge bulb is configured by a shield coating wire, and the shield coating is electrically contacted with the conductive coating of the connector. Alternatively, attach a metal socket fixture to the opening on the back of the reflector inside the lamp body, attach a discharge bulb to this socket fixture, and attach this socket fixture to the conductive coating of the connector. It is preferable to have a configuration in which they are in contact with each other. further,
A shade, which is arranged on the front side of the discharge bulb and limits the irradiation range of light, is formed of a conductive material, and the shade is electrically contacted with the conductive coating. The conductive coating is preferably composed of a coating film of a conductive paint or a metal cap formed on the surface of the socket.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are a front view and a rear view in which a part of an embodiment in which the present invention is applied to a four-lamp headlight of an automobile is cut away. 3 is a cross-sectional view taken along the line AA of FIG. 1, and FIGS. 4 and 5 are lines BB and C of FIG. 1, respectively.
It is sectional drawing which follows the C line. In these figures, an integrated reflector 2 in which two rotary parabolic reflectors 3 and 4 are continuously arranged is provided inside the lamp body 1, and is located outside the vehicle body when mounted on a vehicle. A discharge valve 5 is provided on the reflector 3 on the side of the passing beam lamp LL, and a halogen valve 6 is provided on the reflector on the side of the traveling beam lamp HL located inside the automobile body.
Each is detachably attached.

Further, on the back surface of the lamp body 1 facing these bulbs 5 and 6, there are openings 1 for inserting the bulbs, respectively.
a, 1b are provided, and the valves 5, 6 can be attached and detached through the openings 1a, 1b. And
Opening 1 of discharge bulb 5 on low beam lamp LL side
a, a removable back cover 7 is mounted via a seal ring 8, and a rubber cover 9 is mounted on the opening 1b on the side of the traveling beam lamp HL, whereby these openings 1a, 1b are waterproof. It is sealed with. A connector 10 described later in detail is connected to the socket 5a of the discharge bulb 5 of the passing beam lamp LL, and a socket connector 6a of the halogen lamp 6 of the traveling beam lamp HL.
Is projected outside the rubber cover 9, and a connector (not shown) is connected thereto.

An aluminum film 11 is applied or vapor-deposited on the inner surface of the integrated reflector 2, that is, the reflectors 3 and 4 to form a reflection surface (see FIG. 7). Further, aluminum films 12 and 13 are applied or vapor-deposited on the inner surfaces of the lamp body 1 and the back cover 7 (see FIG. 7).
While the inner surface is used as a part of the reflection surface and as a pseudo reflector, it is also configured as a shield film for electromagnetically shielding the inside of the lamp body 1. Further, in order to enhance the shielding effect, a shield plate 14 formed by bending a metal plate is fixedly supported around the discharge bulb on the inner surface of the lamp body 1 by screws or adhesion. A lens 15 is attached to the front opening of the lamp body 1, and the lamps LL,
The HL light room is defined. Further, on the back surface of the lamp body 1, stud bolts 24 for attaching the lamp to the vehicle body of the automobile are erected.

On the other hand, FIG. 6 is a partially exploded perspective view of a main part, and FIG. 7 is an enlarged sectional view of the assembled state thereof.
In the reflector 3 to which the discharge bulb 5 is attached, a socket fixture 16 made of a metal plate is fixed in the bulb mounting hole 3a on the back surface, and the discharge bulb 5 is attached to the socket fixture 16. In the discharge bulb 5, a discharge tube 51 and a conductive support 52 are erected on the front surface of a cylindrical socket 5a, and one end of the discharge tube 51 is connected to a first electrode 53 provided on the center of the rear surface of the socket 5a. , One end of the support is a second part which is arranged on a part of the circumference of the peripheral surface of the socket
It is connected to the electrode 54. The discharge tube 51 is electrically connected to the other end of the support 52 at the other end. Further, the discharge tube 51 is covered with a transparent cylindrical shroud 55, and a conductive light-shielding paint 56 is applied to a part of the shroud 55 to cover the area of the light emitted from the discharge tube 51. I have a limit.

Further, the socket fixture 16 is formed in a substantially annular plate shape, and is fixed to the valve mounting hole 3a of the reflector 3 with screws at tongue pieces 161 provided at a plurality of locations around the socket fixture 16. There is. Further, a plurality of hooks 161 for retaining a retainer spring, which will be described later, are formed at a plurality of positions on the circumference of the socket fixture 16, and projecting pieces 161 for making electrical contact with the connector 10 are provided. Has been.

The socket 5a of the discharge bulb 5
The peripheral edge of the front surface of the socket is brought into contact with the socket fixture 16 and is pressed by the elastic force of the retainer spring 17 hooked on the hook 161 of the socket fixture 16, whereby the discharge bulb 5 is reflected via the socket fixture 16. 3 is fixedly supported. Further, a shade 18 for obtaining a desired light distribution characteristic is provided at a position on the front side of the discharge bulb 5.
Is arranged. The shade 18 is formed of a metal material capable of blocking light, and a leg portion 181 that extends downward at a lower portion of the shade 18 is provided with a screw 182 on the front surface of the reflector 3.
It is fixed at. In this case, it may be configured to be fixed to a part of the socket fixture 16 and electrically connected to the socket fixture 16.

Further, the socket 5a of the discharge bulb 5
The connector 10 is mounted on the connector 10. The connector 10 is formed with a circular concave portion 101 capable of accommodating the rear portion of the socket 5a, and the central portion and a part of the inner peripheral surface of the circular concave portion are electrically conductive. First and second terminals 102 and 103 formed of a flexible spring material are arranged. Further, a metal cover 104 as a conductive coating formed by processing a metal material is integrally formed on the peripheral surface of the connector 10, and the peripheral edge portion 105 of the front opening of the metal cover 104 is located at the front side position of the connector 10. It is projected up to.

Further, the connector 10 has a lighting circuit 2
The cord 19 drawn from 0 is connected. The cord 19 is configured as a shielded wire in which a two-core inner conductive wire is shielded with a shield coating, and the inner conductive wire is the first and second terminals 10 of the connector 10, respectively.
2, 103, and the shield cover is electrically connected to the metal cover 104 by being sandwiched from the periphery in the insertion hole of the metal cover 104. Then, by pushing the socket 5a of the discharge bulb 5 into the circular recess 101 of the socket 10, the socket 5a is fitted to the connector 10, and at the same time, the first and second electrodes 5 of the socket 5a are inserted.
3, 54 respectively contact the first and second terminals 102, 103 of the connector 10 and are electrically connected to each other. At this time, the front opening peripheral edge portion 105 of the metal cover 104 is brought into contact with the projecting piece 163 of the socket fixture 16 and electrically connected thereto.

Further, the lighting circuit 20 for supplying a high voltage to the discharge bulb 5 has a stabilizing circuit section which receives an on-vehicle battery voltage as an input, and the discharge valve 5 is lit from the output voltage of the stabilizing circuit section. And a starter circuit portion for generating a high voltage are integrally formed and are housed inside a metal case 21. The lighting circuit case 21 is fixedly supported by a bracket, a bolt, or the like (not shown) at the lower surface of the lamp body 1, particularly at a position directly below the passing beam lamp LL having the discharge bulb 5. The cord 19 connected to the discharge bulb 5 is pulled out from the lighting circuit case 21. Further, the cord 19 is provided with a rubber bushing 22 for waterproofing in a cord insertion hole formed in a part of the rear surface of the lamp body 1. The connector 10 is connected to a tip portion of the lamp body 1 which is inserted through the lamp body 1. The shield coating of the cord 19 is electrically connected to the ground terminal provided in the lighting circuit 20. In addition,
A power cord 23 connected to an on-vehicle battery (not shown) is drawn out from the lighting circuit case 21.

Here, a fulcrum portion 31 of the optical axis adjusting mechanism is provided substantially in the center of the upper portion of the integrated reflector 2, and the vertical and horizontal optical axis adjusting portions 32 are provided immediately below the fulcrum portion 31 and the positions inside thereof. A vertical optical axis adjustment unit 33 is provided. As shown in FIG. 5, the optical axis adjustment fulcrum portion 31 has a pivot receiver 34 integrally attached to the back surface of the integrated reflector 2 and a pivot stud 35 on the lamp body 1 facing the pivot receiver 34.
The pivot 36 at the tip of the pivot stud 35 is fitted to the pivot receiver 34 to form a fulcrum when the integrated reflector 2 is tilted vertically and horizontally.

The upper, lower, left and right optical axis adjusting sections 32 and the upper and lower optical axis adjusting sections 33 are respectively adjusted on the back surface of the integrated reflector 2 as shown by the upper, lower, left and right optical axis adjusting section 32 as a representative. The nut 37 is attached, and the lamp body 1 facing the nut 37 is attached with an adjusting screw 38 in the front-rear direction.
Is rotatably supported, and the adjusting screw 38 is screwed into the adjusting nut 37. As a result, when the adjusting screw 38 is axially rotated, the screwing position of the adjusting nut 37 with respect to the adjusting screw 38 is changed in the front-rear direction, and the integrated reflector 2 is moved upward, downward, leftward, and rightward with the fulcrum 31 as a fulcrum. The optical axis is tilted and its optical axis is adjusted. In this embodiment, the adjusting screw 38 is coupled by the gear mechanism 39 to the optical axis adjusting shaft 40 protruding in the front direction of the lamp body 1, and the optical axis adjusting shaft 40 is rotated from the front side of the lamp. By doing so, the optical axis adjustment can be performed.

According to the structure of the lamp of this embodiment, since the lighting circuit 20 is shielded by the metal case 21, the electromagnetic wave from the lighting circuit 20 is not radiated to the outside. In addition, the cord 19 is extended from the lighting circuit case 21 to the discharge bulb 5.
Is composed of shielded shielded wire, electromagnetic radiation from the cord 19 is also prevented. Further, in the discharge bulb 5, a metal cover 104 provided as a conductive coating on the connector 10 and a socket fixture 16 electrically contacting the metal cover 104 are provided to the rear surface side of the discharge bulb 5 and the socket 5a. Since the surroundings are shielded, electromagnetic waves from these are prevented from being radiated toward the back surface of the lamp.

On the other hand, since the shade 18 made of a metal material is disposed on the front side of the discharge bulb 5, it is shielded also in this direction, and the emission of electromagnetic waves is suppressed. Further, in this case, the radiation of electromagnetic waves from the discharge tube 51 in this direction is also suppressed by the conductive paint 56 formed on the shroud 55 surrounding the discharge tube 51 of the discharge bulb 5. Further, in this embodiment, electromagnetic waves are radiated to the outside of the lamp body 1 also by the aluminum film 12 formed on the inner surface of the lamp body 1, the metal shield plate 14, and the aluminum film 13 formed on the inner surface of the back cover 7. It is possible to prevent this.

Therefore, in this lamp, a space necessary in the lamp body 1 is secured in order to enable adjustment of the optical axis of the integrated reflector 2, while the lighting circuit 20 is designed to reduce the size of the lamp body. Even when the lamp is arranged outside the lamp body 1, electromagnetic waves generated from the lighting circuit 20, the cord 19, the discharge bulb 5 and the vicinity thereof are at least in the rear direction of the lamp in which various electronic devices mounted on the automobile are present. It is possible to suppress the emission of noise toward the vehicle, and it is possible to prevent noise from being mixed in the radio of the automobile and the influence of electromagnetic waves on other electronic devices.

Here, in the above embodiment, the shade 18 is used.
Is in a floating state electrically, but FIG.
The shade 18 may be grounded as shown in FIG. FIG. 8A is a partially exploded perspective view of the same, and FIG. 8B is a sectional view of the assembled state. Here, the metal shade 18 is integrally provided with a pair of stems 183 that extend straight in the rear direction of the lamp, and a notched recess 3b is provided at the diameter position of the valve mounting hole 3a of the reflector 3 to provide the stem 183. The front end portions 184 of the above are inserted into the valve mounting holes 3a from the front surface side of the reflector 3 and then disposed in the respective concave portions 3b. Then, by fixing the socket fixture 16 to the valve mounting hole 3a from the back side with the screw 185, the tip end portion 184 is sandwiched between the valve mounting hole 3a and the socket fixture 16, and as a result, the stem 183 is inserted. The shade 18 is electrically connected to the socket fixture 16. As a result, the shade 18 can be held at the ground potential, and the effect of preventing the emission of electromagnetic waves from the bulb 5 can be enhanced. The retainer spring 17 is inserted into the groove 3c formed in the portion radially projected from the valve mounting hole 3a, and the socket fixture 16 is inserted.
Is pressed by.

Further, the projecting piece 163 provided on the socket fixture 16 shown in FIG. 6 is composed of a pair of tongue pieces 164 as shown in FIG.
The cord 19 connected to 0 may be wound and fixed. This ensures that the shield coating of the cord 19 and the socket fixture 16 can be electrically connected to each other, whereby the shield coating is electrically connected to the ground terminal provided in the lighting circuit 20 at one end side and this at the other end side. By being electrically connected to the socket fixture 16, both ends thereof are grounded, the shield coverage of the cord 19 can be improved, and the radiation of electromagnetic waves from the cord 19 can be prevented more effectively.

Here, in the above-mentioned embodiment, the metal cover is integrally provided on the outer surface of the connector, but the metal cover may be formed by applying a conductive paint to the outer surface of the connector in a thicker manner. Alternatively, it may be formed separately from the connector. For example, as shown in FIG.
The connector 10 may be of a normal resin-molded structure having no metal cover, and the outer side thereof may be covered with a connector cover 25 made of a metal material formed separately from the connector 10. In this example, the connector cover 2
5 is formed in the shape of a container with one surface opened, and the projecting edges 252 provided on the peripheral edge of the opening are elastically fitted by the locking pieces 165 provided at four locations on the circumference of the socket fixture 16. , Outside the connector 10, the reflector 3
Is supported by the valve mounting hole 3a.

Then, as shown in the sectional structure of FIG. 9B, the cord 19 is inserted into the notch 251 provided on the lower surface of the cord 19 and the electrical cord is electrically connected to the peripheral edge of the socket fixture 16 at the opening edge. Connected to, and further cord 1
It is also electrically connected to the shield coating of 9. For example, this figure shows the case of the socket fixture 16 of FIG. 8, and the lower edge portion of the connector cover 25 has a tongue piece 164.
By being elastically contacted with, the socket fixture 16 and the cord 19 are electrically connected to the shield coating, respectively.
Even if the connector cover 25 that is separate from the connector 10 is used as described above, the same shielding effect as that of the above-described embodiment can be obtained as long as the connector 10 is surrounded.

Further, in the above-mentioned embodiment, the shield wire of the two-core structure is used for the cord. However, as shown in FIG. 10 (a), the shield wire 19A of the one-core structure is used and two of these are connected in parallel. May be used for. Further, as shown in FIGS. 10B and 10C, a resin coating is further provided outside the shield coating.
A cord composed of shielded wires 19B and 19C having a core structure or a two-core structure may be used. Here, although the shield coating is shown as an example of a wire mesh in which conductive wires are formed in a mesh shape, it goes without saying that it may be formed of a metal foil.

In the case of a two-core structure, FIG. 10 (d)
As described above, after covering each shield core wire 191 with the water resistant soft resin 192 of the inner layer and the heat resistant soft resin 193 of the outer layer, these core wires are placed in the hollow heat resistant soft resin tube 194 having a sufficiently large inner diameter. A cord 1 which is inserted and has a metal mesh 195 disposed outside the tube 194.
It may be 9D. In this cord 19D, the tube 194 made of a heat resistant resin and the coating 193 have a double structure, so that the heat resistance becomes extremely high, and the water resistant resin 192 also enhances the water resistance. Further, since the space 196 is provided between the tube 194 and each core wire,
The withstand voltage is also enhanced by the permittivity of air. Needless to say, the electromagnetic shield is secured by the metal mesh 195.

Further, in the lighting circuit 20 of the above-described embodiment, an example in which the stabilizing circuit portion and the starter circuit portion forming the lighting circuit are integrally provided in one lighting circuit case 21 is shown. As shown in (a) to (c), the stabilizing circuit unit 201 and the starter circuit unit 202 may be housed in separate circuit cases.
In FIG. 11A, the stabilizing circuit unit 201 configured separately is provided.
An example in which both the starter circuit portion 202 and the starter circuit portion 202 are fixedly supported side by side on the bottom surface of the lamp body 1 is shown. In addition, FIG.
In (b), an example in which the stabilizing circuit unit 201 is fixedly supported on the bottom surface of the lamp body 1 and the starter circuit unit 202 is fixedly supported on the back surface of the lamp body 1 is shown. Further, FIG.
In (c), an example is shown in which the starter circuit portion 202 is fixedly supported on the back surface of the lamp body 1, and the stabilizing circuit portion 201 is fixedly supported on a part of a vehicle body or the like different from the lamp body 1.

In particular, in the example of FIG. 11B, the connection cord 26 for connecting the stabilizing circuit portion 201 and the starter circuit portion 202 is extended inside the lamp body 1 so that the connection cord 26 Electromagnetic waves from the outside are prevented from being radiated to the outside of the lamp body 1 to enhance the shield effect. On the other hand, in the example of FIG.
Connection cord 26 for connecting the starter circuit unit 202 and the starter circuit unit 202
Since this is extended to the outside of the lamp body 1, by using a shield wire as shown in FIG. Is getting

Here, in the above-mentioned embodiment, an example in which the present invention is applied to a four-lamp type headlamp is shown. However, a two-lamp type headlamp or another lamp such as a fog lamp or a clearance lamp is integrated. It is also possible to apply it to a combination type headlight.

[0031]

As described above, according to the present invention, the discharge bulb disposed inside the lamp body and the connector connected to the discharge bulb are surrounded by the conductive coating for shielding. EM for automobile radios and other electronic devices by shielding electromagnetic waves emitted from discharge bulbs, connectors and cords connected to them.
The I disorder can be effectively prevented. Therefore, even if the lighting circuit is placed outside the lighting body to secure the space required to allow the optical axis adjustment of the reflector inside the lighting body, the electromagnetic radiation from the lighting circuit is reliably prevented. This is advantageous in reducing the size of the lamp.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of a headlamp of the present invention.

FIG. 2 is a rear view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

4 is a cross-sectional view taken along the line BB of FIG.

5 is a cross-sectional view taken along the line CC of FIG.

FIG. 6 is a partially exploded perspective view of a main part.

7 is a cross-sectional view of the assembled state of FIG.

FIG. 8 is a partially exploded perspective view of a main part showing another embodiment of the present invention and a sectional view of its assembled state.

FIG. 9 is a cross-sectional view of another embodiment of the connector cover and its assembled state.

FIG. 10 is a perspective view and a cross-sectional view showing a modified example of the cord.

FIG. 11 is a schematic configuration diagram showing another modification of the lighting circuit.

[Explanation of symbols]

 1 Lamp Body 2 Integrated Reflector 5 Discharge Valve 6 Halogen Bulb 7 Back Cover 10 Connector 11, 12, 13 Aluminum Film 14 Shield Plate 15 Lens 16 Fixture 18 Shade 19 Code (Shield Line) 104 Metal Cover LL Passing Beam Lamp HL Traveling Beam lamp

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masahiro Kusaya, 500 Kitawaki, Shimizu, Shizuoka Prefecture, Koito Manufacturing Co., Ltd.Shizuoka Plant (72) Inventor, Masatoshi Yoneyama, 500, Kitawaki, Shimizu City, Kozu Manufacturing Co., Ltd., Shizuoka Plant

Claims (9)

[Claims] 1. A vehicular lamp having a structure in which a discharge bulb provided inside a lamp body is attached, wherein a connector attached to a socket of the discharge bulb is covered with a conductive coating, and the discharge is covered with the conductive coating. A vehicular lamp having a discharge bulb, characterized in that the bulb is shielded. 2. The cord for electrically connecting the discharge bulb and a lighting circuit for lighting the discharge bulb is composed of a shield coating wire, and the shield coating is brought into electrical contact with the conductive coating of the connector. Vehicular lamp having the above discharge bulb. 3. A metal socket fixture is attached to an opening on the rear surface of the reflector provided inside the lamp body, the discharge bulb is attached to the reflector via the socket fixture, and the socket fixture is attached to the reflector. A vehicle lamp having a discharge bulb according to claim 1 or 2, which is brought into electrical contact with a conductive coating of the connector. 4. A shade, which is arranged on the front side of the discharge bulb and regulates a light irradiation range, is formed of a conductive material, and the shade is electrically contacted with the conductive coating. A vehicle lamp having one of the discharge bulbs. 5. A vehicle lamp having a discharge bulb according to claim 1, wherein the conductive coating is formed of a coating film of a conductive paint or a metal cap formed on the surface of the socket. 6. A vehicular lamp having a discharge bulb according to claim 2, wherein the shield coating of the cord is formed of a wire mesh or a metal foil. 7. A vehicular lamp having a discharge bulb according to claim 2, wherein the lighting circuit is arranged outside the lamp body. 8. The discharge lamp according to claim 7, wherein the lighting circuit includes a stabilizing circuit and a starter circuit, and a connecting cord connecting the stabilizing circuit and the starter circuit is housed inside the lamp body. Vehicle lighting. 9. The discharge bulb according to claim 7, wherein the lighting circuit is composed of a stabilizing circuit and a starter circuit, and a connecting cord connecting the stabilizing circuit and the starter circuit is extended outside the lamp body. A vehicle lamp having.