JPH09134601A - Vehicular lighting fixture having discharge bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent electromagnetic radiation from a cord to electrically connect a lighting circuit and a discharge bulb to each other by arranging the lighting circuit of the discharge bulb outside a lighting fixture body to attain size reduction of a vehicular lighting fixture. SOLUTION: A starter circuit part 33 arranged on an outside surface of a lighting fixture body 1 is internally installed in a vessel of a shielding structure, and a shielding cover 36 is arranged so as to cover this starter circuit part 33, and a cord 13 electrically connected to a discharge bulb by being inserted into a cord inserting hole 1c of the lighting fixture body 1 after being pulled out of the starter circuit part 33, is sealed by a shield. Electromagnetic radiation from the cord 13 is prevented by the shielding cover 36, and influence of EMI on various electronic devices mounted on an automobile can be relieved.

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 as an automobile headlight, and more particularly to a vehicular lamp that uses a discharge bulb as a light source and is downsized.

[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 secondary side wiring as short as possible in terms of safety measures. For this reason, generally, among the lighting circuits, components such as a transformer and a capacitor forming a booster circuit portion, that is, a starter circuit portion are integrally provided in a body of a lamp.

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 is provided with an optical axis adjusting mechanism for a reflector like a headlight, when the reflector or the optical axis is adjusted inside the lamp body. It is necessary to secure the area necessary for moving the lamp body to the above position, and further downsize the lamp body. Therefore, in this type of lamp, it becomes difficult to secure a space for mounting the starter circuit section inside the lamp body, and the starter circuit section must be mounted outside the lamp body.

[0004]

However, when the starter circuit section is provided outside the lamp body, electromagnetic waves generated by the high voltage generated in the starter circuit section are radiated to the outside, and the electromagnetic waves are transmitted to various electronic parts of the automobile. It will be affected by noise and interfere with the normal operation of these electronic components. For example, noise may be generated in the radio, or noise may be mixed into the signal system of the microcomputer installed in the automobile, causing so-called EMI failure. This is because when the starter circuit section is installed 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 starter circuit section go outside the lamp body. Although it is prevented from being radiated, one of the causes is that the shield effect cannot be obtained by mounting the starter circuit part outside the lamp body.

For this reason, the starter circuit portion is housed in a shield container to prevent the emission of electromagnetic waves. However, since the cord connecting the starter circuit portion and the discharge tube hangs down outside the lamp body, this cord is used. It is difficult to prevent the emission of electromagnetic waves from the. Therefore, it is conceivable to configure the cord in a shield structure, but since it is a cord to which a high voltage is applied, there arises a problem such as a withstand voltage with respect to the shield outer layer, and a deterioration in durability due to a change with time. An object of the present invention is to provide a vehicular lamp that can be miniaturized while preventing EMI damage due to electromagnetic radiation from a starter circuit portion provided in a vehicular lamp that uses a discharge bulb as a light source.

[0006]

SUMMARY OF THE INVENTION A vehicular lamp of the present invention comprises:
Using the discharge bulb internally arranged in the lamp body as the light source,
In a vehicle lamp in which a lighting circuit for lighting the discharge bulb is integrally supported with respect to the lamp body, the lighting circuit is attached to the lamp body at a position on the rear side of the discharge bulb, and the lighting circuit and the discharge circuit are attached. It is characterized in that a shield cover for covering the cord connecting to the bulb is arranged on the lamp body.

Here, the lighting circuit is a starter circuit section for generating a high voltage. The starter circuit section is housed in a container having a shield structure, and a cord is pulled out from a part of the container and connected to a discharge valve. Let In addition, the shield cover is provided at least in a region that covers the cord while being pulled out from the starter circuit portion and being inserted into the lamp body through the cord insertion hole provided in the lamp body.

[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 drawings, two parabolic-shaped retractors 3 and 4 are provided inside the lamp body 1.
The integrated beam lamp LL, which is located outside the automobile body, is equipped with an integrated reflector 2 in which
A discharge bulb 5 is detachably attached to the side reflector 3 and a halogen bulb 6 is detachably attached to the reflector on the side of the traveling beam lamp HL located inside the automobile body.

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 is attached to the discharge bulb 5 of the passing beam lamp LL.
Is connected, and the halogen lamp 6 of the traveling beam lamp HL is connected.
A connector (not shown) is connected to the rubber cover 9 from the outside.

Also, aluminum or the like is coated or vapor-deposited on the inner surface of the integral reflector 2 to form a reflection surface. Here, the inner surface of the lamp body 1 is also coated or vapor-deposited and the inner surface is While using a part of the reflecting surface as a part, it also serves as a shield film for electromagnetically shielding the inside of the lamp body 1. A lens 11 is attached to the front opening of the lamp body 1, and a lamp chamber of each of the lamps LL and HL is defined in the lamp body 1. Further, in this embodiment, as shown in FIG. 4, an opening 3a is provided in a part of the lower side of the reflector 3, and a clearance valve 14 is supported by a connector socket 15 on a part of the bottom surface of the lamp body 1 in the opening 3a. Has been done.

A fulcrum portion 21 of the optical axis adjusting mechanism is provided substantially in the center of the upper portion of the integrated reflector 2, an up / down / left / right optical axis adjusting portion 22 is provided directly below the fulcrum portion 21, and a vertical portion is provided at a lower position of the reflector 3. An optical axis adjusting unit 23 is provided. As shown in FIG. 5, the optical axis adjustment fulcrum portion 21 has an integral reflector 2 as shown in FIG.
A pivot receiver 24 is integrally attached to the rear surface of the lamp body, and a leveling adjusting device 25 is attached to the lamp body 1 facing the pivot receiver 24.
The pivot 26 protruding from the leveling adjustment device 25 is fitted to the pivot receiver 24, and the pivot fitting structure constitutes a fulcrum when tilting the integrated reflector 2 vertically and horizontally. There is. The leveling adjusting device 25 has been conventionally provided, and for example, the pivot 26 is advanced and retracted by electronic control in accordance with an inclination state (leveling state) of the automobile with respect to the horizontal direction, whereby the pivot fitting is performed. The position of, i.e., the fulcrum position of the reflector is changed in the front-rear direction, and the optical axis angle is made to follow the leveling of the automobile.

The upper and lower left and right optical axis adjusting portions 22 and the upper and lower optical axis adjusting portions 23 are respectively provided with adjusting nuts 27 on the back surface of the integrated reflector 2 as shown by the upper and lower left and right optical axis adjusting portions 22 in FIG. The adjusting screw 28 is attached to the lamp body 1 which is attached to and faces the adjusting body 28 so as to be rotatable in the front-rear direction.
It is screwed to 7. As a result, when the adjusting screw 28 is rotated, the adjusting nut 2 for the adjusting screw 28 is rotated.
The screwing position of 7 is changed in the front-rear direction, and the integrated reflector 2 is tilted in the up-down, left-right, and up-down directions with the fulcrum portion 21 as a fulcrum, and its optical axis adjustment is performed. In this embodiment, the adjusting screw 28 is connected to the optical axis adjusting shaft 30 projected to the front side of the lamp body 1 by the bevel gear mechanism 29, and the optical axis adjusting shaft 30 is rotated from the front side of the lamp. The optical axis can be adjusted by operating the optical axis.

On the other hand, the reflector 3 to which the discharge bulb 5 is attached has a shade 12 for obtaining a desired light distribution characteristic.
Are integrally supported. The connector 10 is attached to the base of the discharge bulb 5 as described above, and the lighting circuit 31 is connected via the cord 13 connected to the connector 10.
Connected to. The lighting circuit 31 includes a low voltage circuit section 32.
And a starter circuit section 33 for generating a high voltage for lighting the discharge bulb 5 are separated and divided, and the low voltage circuit section 32 has a relatively large space on the back surface of the lamp body 1. It is attached and fixed to the area or the lower surface area of the lamp body 1. In this embodiment, it is fixedly supported on a part of the rear surface region on the traveling beam lamp HL side. The starter circuit section 33 and the low voltage circuit section 32 are connected by a cord 38, and the low voltage circuit section 32 is connected to the power cord 3.
It is connected to the in-vehicle power source side by 9.

On the other hand, as shown in FIG. 6 together with a partial exploded perspective view of the rear structure of the main part of the lamp body, the starter circuit portion 33 includes a circuit element in a container formed of a metal or the like as a shield container. The starter circuit portion 33 is fixed to the rear surface of the lamp body 1 in the vicinity of the bulb insertion opening 1a of the discharge bulb 5 by a small screw 34. And this starter circuit unit 33
A cord insertion hole 1c is formed in a part of the rear surface of the lamp body 1 which is close to the lamp body 1, and the cord 13 connected to the connector 10 is inserted into the coat insertion hole 1c by using a waterproof rubber bushing 35 to start the starter. The circuit section 33 and the discharge bulb 5 are electrically connected.

Furthermore, on the rear side of the lamp body 1,
A shield cover 36 is arranged in a region extending over the valve insertion opening 1a and the starter circuit portion 33. The shield cover 36 is formed in an annular shape with one side 36a having an inner diameter substantially equal to the opening diameter of the valve insertion opening 1a, and the other side 36b is the starter circuit section 3a.
3 is made of a metal plate processed into a rectangular container shape slightly larger than the outer width dimension and having the other side surface opened. In particular, the other side portion 36a is covered with a part of the starter circuit portion 33. Is composed of. A pair of tongue pieces 36c provided at both ends of the other side portion 36b are fixed together with the starter circuit portion 33 to the lamp body 1 by the small screw 34. Then, in this supported state, one side portion 36a thereof has the valve insertion opening 1
The cylindrical back cover 7 is arranged along the peripheral edge of a and is attached to the valve insertion opening 1a.
It is sandwiched between the lamp body 1 and the lamp body 1. In this embodiment, a small nut 37b screwed into an embedded screw 37a provided upright on the lamp body 1 for fixing the back cover 7 to the lamp is used to utilize one side portion 36a of the shield cover 36. Are tightened together to increase the support strength of the shield cover 36.

In the shield cover 36 fixed to the back surface of the lamp body 1 in this way, FIG.
As shown in the cross-sectional view taken along the line DD of FIG. 1, of the cords 13 that electrically connect the starter circuit portion 33 and the connector 10 of the discharge bulb 5, the cord 13 is pulled out from the starter circuit portion 33 and inserted through the cord insertion hole 1c. The cord portion extending along the outer side of the lamp body 1 until then is covered by the other side portion 39b of the rectangular container shape, and is shield-sealed by the shield cover 36.

As shown in FIGS. 2 and 3, this headlight is attached to the vehicle body panel P of the automobile by a plurality of stud bolts 16 formed on the rear surface of the lamp body 1 so as to project rearward. It is designed to be attached. In the state of being attached to the vehicle body panel P, the starter circuit portion 33 attached to the back surface of the lamp body 1 is located outside the vehicle body panel P.

According to this configuration, the starter circuit section 33
Since it is shielded by its own container having a shield structure, electromagnetic waves from the internal circuit element are not leaked to the outside. Further, since the cord 13 pulled out from the starter circuit container 33 and extended to the cord insertion hole 1c of the lamp body 1 is shielded and sealed by the shield cover 36, electromagnetic radiation from this cord portion is also generated. To be prevented. Further, the cord portion from the cord insertion hole 1c to the discharge bulb 5 is extended inside the lamp body 1, and an aluminum shield film provided on the inner surface of the lamp body 1 and an integrated reflector in which the aluminum film is also formed. Since it is sandwiched by the two, the shielding property in this portion is also secured and electromagnetic radiation is prevented.

Therefore, in this lamp, the space necessary in the lamp body 1 is secured to enable adjustment of the optical axis of the integrated reflector 2, while the starter circuit portion is used to achieve the downsizing of the lamp body. Even if the configuration in which the 33 is arranged outside the lamp body 1 is adopted, it is possible to prevent the electromagnetic waves generated in the starter circuit section 33 from giving EMI interference to the automobile radio and other electronic components. It is possible to prevent noise from mixing in and error in control of electronic parts using a computer or the like. In particular, the leveling adjustment device 25, which adjusts the leveling of the headlight according to the inclination of the vehicle, is fixed to the rear position of the lamp body 1 near the discharge bulb 5, and the code 4
Although it is controlled by an in-vehicle computer connected via 0, normal leveling is achieved without being affected by electromagnetic radiation from the starter circuit section 33 or its cord 13 which is close to the leveling adjustment device 24. It becomes possible to operate.

Further, since the shield cover 36 is formed separately from the back cover 7, the discharge bulb 5
When replacing the valve, it is sufficient to remove only the back cover 7 with the shield cover 36 still attached, and the workability of valve replacement is good. Since the shield cover 36 is not subjected to a particularly large load, it may be formed integrally with the back cover 7 that is attached to and detached from the valve insertion opening 1a of the discharge bulb, for example. FIG. 8 is a diagram showing an example thereof, in which one side portion 36 of the shield cover 36, which has an annular shape.
The resin is molded integrally with the back cover 7 in a. Then, a metal is applied or vapor-deposited on at least the inner surface or the outer surface of the shield cover to form a shield film to exert a shield effect. As a result, the number of parts can be reduced, and the work for independently fixing the shield cover 36 to the lamp body 1 is not required, and the number of headlamp assembling steps can be reduced. The back cover and the shield cover may be simply integrated with an adhesive.

Further, in the above-described embodiment, the low voltage circuit portion 32 of the lighting circuit 31 of the discharge bulb is fixed to the position on the left and right side of the starter circuit portion 33 of the lamp body 1, so that the starter circuit portion is fixed. Balance the weight with 33,
The left and right balance of the entire lamp can be balanced, which is also effective in stably mounting the headlight on the vehicle body. Further, in the above-described embodiment, an example in which the present invention is applied to a four-lamp type headlamp is shown, but a two-lamp type headlamp or a combination type in which other lamps such as a fog lamp and a clearance lamp are integrated. It is also possible to apply to the headlight of.

[0022]

As described above, according to the present invention, the lighting circuit for lighting the discharge bulb internally arranged in the lamp body is attached to the lamp body at the rear side position of the discharge bulb, and the lighting circuit is provided. Since the shield cover that covers the cord connecting to the discharge bulb is placed on the lamp body,
The shield cover prevents electromagnetic radiation from the cord and allows EMI for car radios and other electronic devices.
The obstacle can be effectively prevented. Therefore, while securing the space necessary to enable the optical axis adjustment of the reflector installed in the lamp body, the lamp is downsized, and therefore even when the lighting circuit is supported on the outer surface of the lamp body, It is possible to reliably prevent electromagnetic radiation from the lighting circuit.

[Brief description of the 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 partial exploded perspective view of a part of the back surface of the lamp body.

FIG. 7 is a cross-sectional view taken along line DD of FIG.

FIG. 8 is a perspective view of another embodiment of the shield cover.

[Explanation of symbols]

 1 Lighting body 2 Integrated reflector 5 Discharge bulb 6 Halogen bulb 7 Back cover 10 Connector 11 Lens 13 Code 31 Lighting circuit 32 Low voltage circuit section 33 Starter circuit section 36 Shield cover LL Passing beam lamp HL Traveling beam lamp

Claims (4)

[Claims] 1. A vehicle lamp comprising a discharge bulb internally arranged in a lamp body as a light source, and a lighting circuit for lighting the discharge bulb integrally supported by the lamp body. The discharge bulb is characterized in that a shield cover, which is attached to an outer surface portion of the lamp body at a rear side position of the discharge bulb and covers a cord connecting the lighting circuit and the discharge bulb, is arranged in the lamp body. Vehicle lighting. 2. The lighting circuit is a starter circuit unit for generating a high voltage, the starter circuit unit is internally housed in a container having a shield structure, and a cord is pulled out from a part of the container and connected to a discharge bulb. Item 2. A vehicle lamp having the discharge bulb of Item 1. 3. The shield cover is provided so as to cover the cord at least in a region where the cord drawn out from the starter circuit portion is inserted into the lamp body through a cord insertion hole provided in the lamp body. Item 3. A vehicle lamp having the discharge bulb of Item 2. 4. The vehicular lamp having a discharge bulb according to claim 3, wherein the shield cover is made of a metal plate and is fixedly supported by the lamp body together with the container of the starter circuit section.