JPH1097801A - Vehicle lamp fitting with electric discharge bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress electromagnetic radiation from an aperture formed between a reflector to which a conductive film is affixed and a metal cover placed behind an electric discharge bulb in a vehicle lamp fitting with the bulb. SOLUTION: A shield plate 24 bent along a back of reflector 3 is placed in the vicinity of the circumferential edge of a bulb fixing hole of the reflector 3 to which a discharge bulb 5 is affixed. The shield plate 24 is provided with legs 242, 243 and is fixed together with a socket fixture supporting the discharge bulb in the bulb fixing hole. A metal cover 22 is placed to cover a rear portion of the discharge lamp 5 from the back of the reflector 3. The shield plate 24 is grounded through the socket fixture and the like, thereby enabling suppressing of electromagnetic radiation from an aperture formed between the reflector 3 and the metal cover 22 in particular.

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, this type of lamp requires a high voltage in order to generate a discharge in the discharge bulb, and it is necessary to attach a lighting circuit for increasing the vehicle-mounted battery voltage to the required high voltage. In this lighting circuit, since a high voltage is generated on the secondary side, an electromagnetic wave associated with the high voltage is radiated to the outside, and this electromagnetic wave affects various electronic devices of a vehicle as noise, and these electronic devices are affected by noise. This will hinder normal operation. For example, noise is generated in a radio or noise is mixed in a signal system of a microcomputer mounted on an automobile.
Cause an I fault.

[0003] Such an electromagnetic wave also occurs in a discharge bulb to which the above-mentioned high voltage is applied, and the above-mentioned EMI disturbance is caused by the electromagnetic wave from the discharge bulb. For this reason, for example, Japanese Patent Application Laid-Open No. 5-101703 proposes a structure in which a shield member is provided so as to cover the periphery of a discharge bulb or a reflector along the inner surface of a lamp body. According to this technique, it is possible to suppress the radiation of electromagnetic waves toward the periphery of the discharge bulb by the shield member, and to take the above-described EMI countermeasures. In particular, in recent vehicle lamps, the reflector is formed of resin,
Since there are many configurations in which a metal reflective film is formed on the inner surface to serve as a reflective surface, such EMI measures are effective in this type of lamp.

[0004]

However, while this conventional technique is effective in suppressing the emission of electromagnetic waves toward the periphery of the discharge bulb, it is not possible to prevent the emission of electromagnetic waves behind the discharge bulb. difficult. In particular, in the mounting portion of the discharge bulb, a valve mounting hole is opened on the back of the reflector and the discharge bulb is mounted here, so that the shield member described above cannot be provided in the portion of the valve mounting hole. This makes it difficult to suppress the emission of electromagnetic waves. For this reason, for example, it is conceivable to adopt a structure in which a metal plug cover is fitted so as to cover the electrode terminals of the discharge bulb, and to prevent radiation of electromagnetic waves from at least the bulb mounting hole. However,
Even in this case, it is difficult to prevent radiation of electromagnetic waves through the gap between the peripheral edge of the valve mounting hole and the plug cover, and the effect of providing the plug cover is reduced.

An object of the present invention is to provide a vehicle lamp using such a discharge bulb as a light source, and in particular, to provide a vehicle lamp capable of effectively preventing radiation of electromagnetic waves at a mounting portion of the discharge bulb. It is in.

[0006]

The present invention is characterized in that a shield plate having a shape along the back surface of the reflector is provided in a region near the periphery of a valve mounting hole provided in the reflector. It is preferable that the shield plate is integrally formed with a mounting leg piece for fixing to the reflector, and is fixed to the reflector integrally with a member for fixing and supporting the discharge bulb to the reflector. Further, it is preferable that a power supply cord having a metal coating is connected to the discharge bulb, and the mounting leg of the shield plate is grounded via the metal coating of the power supply cord.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway front view of an embodiment in which the present invention is applied to a four-lamp headlight of an automobile.
2 and 3 are cross-sectional views taken along lines AA and BB in FIG. 1, respectively. In these figures, an integrated reflector 2 in which two revolving parabolic reflectors 3 and 4 are continuously provided inside a lamp body 1 and is located outside the vehicle body when mounted on a vehicle The reflector 3 on the side of the passing beam lamp LL is provided with a discharge bulb 5,
A halogen bulb 6 is detachably attached to a reflector on the side of the traveling beam lamp HL located inside the vehicle body. These valves 5 and 6 are attached by valve mounting holes 3a and 4a provided on the back of each of the reflectors 3 and 4.

On the back surface of the lamp body 1 facing the bulbs 5, 6, there are provided opening portions 1 for inserting the bulbs.
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.

Further, as described later, an aluminum film 31 (see FIG. 6) 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. Although not shown, the lamp body 1 is not shown.
An aluminum film is also applied or vapor-deposited on each inner surface of the back cover 7 and the inner surface is used as a part of the reflection surface and a pseudo-reflector, while being used as a shield film for electromagnetically shielding the inside of the lamp body 1. Is also composed. A lens 10 is attached to the front opening of the lamp body 1, and a lamp chamber for each of the lamps LL and HL is defined in the lamp body 1.

FIG. 4 is a partially exploded perspective view of a main part, FIG. 5 is a perspective view of a partially assembled state, and FIG.
As shown in the cross-sectional views along the line CC, respectively, in the reflector 3 to which the discharge bulb 5 is mounted, a pair of mounting walls 3b and 3c are integrally formed in the valve mounting hole 3a on the back surface.
A socket fixture 11 formed by processing a metal plate is fixed to the mounting walls 3b, 3c, and the discharge bulb 5 is attached by the socket fixture 11.

The socket fixture 11 is composed of a pair of fixing pieces 12 and 13 each formed by processing a metal plate having a spring property. The upper end 121 of the first fixing piece 12 is fixed to the mounting wall 3b by a screw 14, and a cover receiving part 122 formed in a substantially U-shape is integrally formed on the outer part thereof. A retainer spring 1 made of a U-shaped wire spring is provided at the upper end 121.
6 is fixedly supported by the screw 14. The upper end 1 of the second fixing piece 13 is fixed to the mounting wall 3 c facing the first fixing piece 12 by two screws 15.
31 is fixed. A cover receiving portion 13 which is formed in a U-shape similarly to the first fixing piece 12 is formed on an outer portion thereof.
2 are integrally formed. Further, hooks 1 for hooking both ends of the retainer spring 16 are provided on both sides thereof.
34 are integrally formed so that both ends of the retainer spring 16 can be locked. Further, on one side, a shield tube fixing portion composed of a pair of holding pieces 136 formed in an arc shape is provided at a tip end of an arm portion 135 protruding laterally, and between these holding pieces 136. The peripheral surface of the end portion of the shield tube described later fits and can be held by the spring force of the holding piece. Note that each of the cover receiving portions 12 of the first and second fixing pieces 12 and 13 is provided.
Engagement grooves 123 and 133 are formed on outer surfaces of the metal covers 2 and 132 so as to be fitted to engagement protrusions provided on a metal cover described later.

A shield plate 24 is provided on the back surface of the reflector 3 in the peripheral area of the valve mounting hole 3a.
As shown in the enlarged perspective view and the plan view in FIGS. 7A and 7B, the shield plate 24 is formed by punching a metal plate such as aluminum into a shape close to an ellipse, and then forming the metal plate into a substantially spherical shape. It is bent into a curved shape, that is, a shape along the curved shape of the back surface of the reflector, and a window 241 is opened in the center thereof, and a pair of L-shaped mountings is provided at two places on the inner edge of the window 241. The leg pieces 242 and 243 are formed to protrude. Further, a plurality of grooves 244 and notches 245 are formed in a plurality of locations on the inner edge of the window toward the outer diameter direction. The mounting leg pieces 242 and 243 are fixed to the reflector 3 together with the socket fixture 11 by means of the screws 14 and 15 on the mounting walls 3b and 3c of the valve mounting holes.
In a state electrically connected to the first connector, the first connector is fixedly supported so as to extend along the back surface of the reflector 3 around the valve mounting hole. At this time, the groove 244 and the notch 245 are
Of the shield plate 24
Is stabilized.

On the other hand, in the discharge bulb 5, a discharge tube 51 and a conductive support 52 electrically connected to the discharge tube 51 are provided upright on a front surface of a cylindrical socket 5a. The discharge tube 51 and the support 52 are respectively connected to the socket 5a. Is electrically connected to the electrode part 55 of the The discharge tube 51 is covered with a transparent cylindrical shroud 53.
A conductive light-shielding paint 54 is applied to a part of the
The area of the light emitted from is limited. A shade 17 made of a metal material is disposed on the front side of the discharge bulb 5.
A pair of stems 172 that extend straight in the rear direction of the lamp are provided integrally on both radial sides of the lamp 71. The distal ends 173 of the stems 172 are inserted from the front side of the reflector 3 along both sides of the valve mounting hole 3a, and the first and second fixing pieces 1 of the socket fixture 11 are inserted.
Mounting walls 3b, 3c with screws 14, 15 together with 2, 3
Fixedly supported.

The discharge bulb 5 is inserted into the bulb mounting hole 3a from the rear side of the reflector 3, and the socket 5a of the discharge bulb is inserted into the space between the mounting walls 3b and 3c. Contact In doing so,
The intermediate portion of the retainer spring 16 is elastically contacted with the back side of the socket 5a, and both ends thereof are connected to the hooks 1 of the second fixing piece 13.
34, the retainer spring 16
The discharge bulb 5 is fixedly supported on the reflector 3 by the elastic pressing force. The first and second fixing pieces 12 and 13 are electrically connected to each other by the retainer spring 16.

Further, the socket 5a of the discharge bulb 5
, A connector 18 is fitted. The connector 18 is connected to a cord 19 drawn from a lighting circuit 20, and is electrically connected to the electrode portion 55 of the discharge bulb 5 when the connector 18 is fitted to the socket 5a.
A high voltage is applied to the discharge bulb 5. The cord 19 is formed of two conductive wires, and is inserted into a shield tube 21 having a metal mesh formed in a tubular shape to perform shielding.
When the connector 18 is fitted in the socket 5a, the shield tube 21 is clamped at one end by a shield tube fixing portion 136 provided on the second fixing piece 13 of the socket fixture 11, and the second fixing is performed. It is in a state of being electrically connected to the piece 13. Although not shown, the shield cylinder 21 is connected to the ground potential of the lighting circuit 20 at the other end.

Further, so as to cover the connector 18,
A container-shaped metal cover 22 formed by processing a metal material is provided. Engagement projections 221 are provided on the peripheral surface of the metal cover 22 at radially opposite positions, and are provided on the other part of the peripheral surface with cutouts through which the shield tube is inserted. 222 are provided. The metal cover 22 is placed on the outside of the mounting walls 3b and 3c of the reflector 3, and opposing portions of the peripheral surface of the metal cover 22 are provided on the first and second fixing pieces 12 and 13 of the socket fixture 11, respectively. By being inserted into the portions 122 and 132 and the engagement protrusions 221 being fitted into the engagement grooves 123 and 133 at that time, the socket is fixed to the socket fixture 11 and, as a result, fixedly supported by the reflector 3 and simultaneously. The socket fixture 11 and the shield plate 24 are respectively brought into contact with and electrically connected thereto. In this state, the shield tube 21 is pulled out through the notch 222.

The cord 19 and the shield tube 2
The lighting circuit 20, which is connected to the other end of 1 and supplies a high voltage to the discharge bulb 5, is housed in a metal case 23. The lighting circuit case 23 is fixedly supported at the lower surface of the lamp body 1, in particular, at a position directly below the passing beam lamp LL having the discharge bulb 5 by a bracket, a bolt or the like (not shown). Then, the cord 19 connected to the discharge bulb 5 is pulled out from the case 23 and is connected to the connector 18 in the lamp body 1 in a state of being covered with the shield tube 21.

According to the configuration of the lamp of this embodiment, the lighting circuit 20 is shielded by the metal case 23, so that the electromagnetic wave from the lighting circuit 20 is not radiated to the outside. Further, a cord 19 which is drawn out of the lighting circuit case 23 and extended to the discharge bulb 5 is provided.
Is shielded by the shield tube 21,
Electromagnetic radiation from the cord 19 is also prevented. further,
In the discharge bulb 5, the connector 18 and the socket 5a are covered with a metal cover 22. The periphery of the discharge bulb 5 is covered with a conductive film 31 (see FIG. 6) such as an aluminum film as a reflection surface formed on the reflector 3. Therefore, they surround the back side and the periphery. Further, since the metal shade 17 exists on the front side of the discharge bulb 5, a part of the front surface thereof is also covered.

In this state, the socket fixture 11 is fixed to the shield cylinder fixing portion 136 of the second fixing piece 13.
Since the shield tube 21 is electrically connected to the shield tube 21, the second fixing piece 13 itself is set to the ground potential via the shield tube 21. The conductive film 31 and the metal shade 17 of the reflector 3, the shield plate 24 extending to the back surface of the reflector 3, and the metal cover 22 are electrically connected to each other via the second fixing piece 13. All are set to the ground potential. Thereby, the discharge bulb 5 and the socket 5a are shielded on the back side and the periphery, and a part on the front side, and the emission of electromagnetic waves from these parts toward the periphery of the lamp is suppressed.

Therefore, in this lamp, since the entire periphery of the discharge bulb 5 is electrically connected to the ground potential via the socket fixture 11 to form a shield wall, the radiation of the electromagnetic wave from the discharge bulb 5 and the socket 5a is performed. Can be effectively prevented. In this case, the conductive film 31 provided on the reflector is not formed at the position of the valve mounting hole, but this portion is shielded by the metal cover 22, and the portion between the conductive film 31 and the metal cover 22 is shielded. The gap is shielded by the shield plate 24. For this reason, the shield plate 24 can effectively prevent radiation of electromagnetic waves from a gap between the conductive film 31 and the metal cover 22 in the valve mounting hole.
In particular, since the shield plate 24 is formed by bending a metal plate such as aluminum which is easy to process, and is disposed in close contact with the back surface of the reflector 3, it is possible to effectively shield the gap described above. It is possible to enhance the shielding effect.

The above embodiment shows an example in which the present invention is applied to a four-lamp type headlamp of an automobile. However, other vehicle lamps such as a two-lamp type headlamp and fog lamps are also applicable. The present invention can be similarly applied as long as a discharge bulb is used as a light source.
Further, the present invention can be similarly applied to a lamp using a projection type lamp using a discharge bulb as a light source.

[0022]

As described above, according to the present invention, the area near the periphery of the bulb mounting hole for mounting the discharge bulb is provided.
A shield plate is arranged along the back of the reflector, and this shield plate prevents the emission of electromagnetic waves from the discharge bulb.Therefore, there is a gap between the conductive film provided on the reflector and the metal plug cover. Even if it occurs, it is possible to effectively prevent radiation of electromagnetic waves from this gap. In addition, since the shield plate is grounded via the mounting leg portion provided on the shield plate, wiring for grounding the shield plate is unnecessary, so that the configuration is not complicated and the assembly work is not complicated. Absent.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of a headlight according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is a partially exploded perspective view of a reflector rear opening.

FIG. 5 is a perspective view of a state where a part of FIG. 4 is assembled.

6 is a sectional view taken along the line CC in FIG.

FIG. 7 is an enlarged perspective view and a plan view of the shield plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp body 2 Lens 3, 4 Reflector 3a Valve mounting hole 3b, 3c Mounting wall 5 Discharge bulb 5a Socket 11 Socket fixture 12 First fixing piece 13 Second fixing piece 16 Retainer spring 17 Metal shade 18 Connector 19 Code 20 Lighting circuit 22 Metal cover 24 Shield plate 242,243 Mounting leg piece

Claims (3)

[Claims] 1. A vehicular lamp in which a discharge bulb is fixedly supported in a bulb mounting hole provided in a reflector, a shield plate having a shape along the rear surface of the reflector is disposed in a region near the periphery of the bulb mounting hole. A vehicular lamp having a discharge bulb. 2. A shield plate is integrally formed with a mounting leg for fixing to the reflector, and the mounting leg is fixed to the reflector integrally with a member for fixing and supporting the discharge bulb to the reflector. A vehicle lamp having the discharge bulb according to claim 1. 3. The power supply cord having a metal coating is connected to the discharge bulb, and the mounting leg is electrically connected to the metal coating of the power supply cord, and is grounded via the metal coating. A vehicle lamp having a discharge bulb.