JP3088078B2 - Vehicle headlights - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular headlamp having a discharge bulb, and more particularly to a structure for mounting a lighting circuit case, which houses a lighting circuit of the discharge bulb, to a lamp body.

[0002]

2. Description of the Related Art In recent years, a discharge bulb has been used as a light source of a vehicle headlamp since it can emit high-intensity light.

[0003] In a headlamp having such a discharge bulb, it is necessary to provide a lighting circuit for applying a high voltage to the discharge bulb and lighting the discharge bulb. Since it is composed of components, it is usually mounted on the lamp of a headlight while being housed in a lighting circuit case. Since this lighting circuit case is relatively large, it is difficult to house it inside the lamp body in terms of securing space.
As disclosed in Japanese Patent Publication No. 0, the lighting circuit case is often provided outside the lamp body.

[0004]

However, since the lighting circuit case in which the lighting circuit is housed has a considerable weight, the lighting circuit case is simply attached to the outer surface of the lamp body as in the prior art. In the structure of the above, a large load is applied to the lighting circuit case mounting portion of the lamp body due to the weight of the lighting circuit case, vibration transmitted to the headlight while the vehicle is traveling, and the like. Damage may occur.

The present invention has been made in view of such circumstances, and a vehicle headlamp capable of minimizing the possibility that deformation or breakage of a lighting circuit case mounting portion of a lamp body occurs. It is intended to provide.

[0006]

SUMMARY OF THE INVENTION The present invention achieves the above object by using a predetermined metal plate as a reinforcing member.

That is, according to the present invention, as described in claim 1, a discharge bulb, a lamp housing the discharge bulb, a lighting circuit for lighting the discharge bulb, and a state where the lighting circuit is housed. A lighting circuit case attached to the outer surface of the lamp body;
A plurality of through holes are formed in each of the lamp body and the lighting circuit case, and a metal plate in which bolts are welded at a plurality of locations is formed on an inner surface of the lamp body. It is provided so as to penetrate each of the through holes of the case, and a nut is fastened and fixed to each of the bolts.

[0008] The "lamp" is not limited to a specific member as long as it is a component of the headlamp and accommodates a discharge bulb. For example, in a headlamp provided with a reflecting mirror movable type aiming mechanism (an aiming mechanism that tilts a reflecting mirror housed in a space formed by a lens and a body in a lamp in which a lens is attached to a body). A reflector such as a body or a head-mounted reflecting mirror having a movable unit aiming mechanism (an aiming mechanism that tilts the reflecting mirror as a unit together with the lens in a lamp in which the lens is attached to the reflecting mirror) is used as a lamp body. Can be adopted.

[0009]

As described above, according to the present invention, in the present invention, a metal plate having bolts welded to a plurality of locations is provided by each of a plurality of through holes formed in a lamp body and a lighting circuit case. The lighting circuit case is mounted on the lamp body by mounting the lighting circuit case on the inner surface of the lamp body with the nuts tightened and fixed to the bolts, so that the lighting of the lamp body is performed. The circuit case mounting portion can be held and held between the lighting circuit case and the metal plate, thereby preventing the occurrence of stress concentration in the lighting circuit case mounting portion.

Therefore, according to the present invention, a large load may be applied to the lighting circuit case mounting portion of the lamp body due to the weight of the lighting circuit case, vibration transmitted to the headlight while the vehicle is running, and the like. Even so, the possibility of deformation or breakage of the lighting circuit case mounting portion can be minimized by the reinforcing function of the metal plate.

Further, in the present invention, since each bolt is a so-called weld bolt welded to a metal plate, the metal plate is arranged at a predetermined position on the inner surface of the lamp body, and a nut is fastened and fixed to each bolt. The lighting circuit case can be attached to the lamp body by the simple work described above.

The mounting position of the lighting circuit case on the lamp body is not particularly limited, but when the lighting circuit case is mounted on the bottom surface of the lamp body as described in claim 2, Since the circuit case mounting portion is easily deformed, it is particularly effective to adopt the configuration of the present invention.

In addition, in a headlamp provided with a discharge bulb, a cord for connecting the discharge bulb and a lighting circuit is required. By forming the insertion holes for inserting the cords in the circuit case, the cords can be easily routed.

In the present invention, the material of the lamp body is not particularly limited. However, in the case of a lamp body made of a material having relatively low rigidity such as a resin molded product, the structure of the present invention is applied. Adoption is particularly effective.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing a vehicle headlamp according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a main part thereof.

As shown in FIG. 1, a headlamp 10 according to the present embodiment has a reflecting mirror 16 provided in a space formed by a body 12 and a lens 14 so as to be tiltable in the vertical and horizontal directions. Has become.

The body 12 is an injection-molded article made of resin, and has four through holes 12b at its bottom 12a.
Are formed, and a metal plate 18 is provided on the inner surface of the bottom surface portion 12a. This metal plate 18
, Weld bolts 20 are welded at four locations corresponding to the respective through holes 12b, and these weld bolts 20 project downward through the respective through holes 12b.

The reflecting mirror 16 has a C-8 type discharge bulb (metal halide bulb) 22 mounted on the optical axis thereof, and the shade 2 is arranged so as to cover the front thereof.
4 are provided. Further, an extension 26 is provided in front of the reflecting mirror 16.

Since the discharge bulb 22 requires a high voltage for lighting, the plug 28 and the cord 30
Lighting circuit 3 housed in lighting circuit case 32 via
4, once connected to a power supply.

The lighting circuit case 32 is made of aluminum die-casting and has a substantially rectangular parallelepiped outer shape. Flanges 32a are formed at two positions before and after the upper end of the lighting circuit case 32. 32a has a through hole 32b
Are respectively formed. And this lighting circuit case 3
2 is provided with the respective weld bolts 20 in the respective through holes 32b.
The nut 36 is fastened and fixed to each of the weld bolts 20 in a state where the nut 36 is pressed against the bottom surface portion 12 a of the body 12 so as to penetrate the body 12.

The cord 30 is provided so as to pass through the metal plate 18, the bottom portion 12a of the body 12, and the insertion holes 18a, 12c and 32c formed in the lighting circuit case 32.

Next, the operation of the present embodiment will be described.

In this embodiment, the metal plate 18 to which the weld bolts 20 are welded is formed at four locations, and each of the weld bolts 20 is attached to the body 12 and the lighting circuit case 3.
The lighting circuit case is provided on the inner surface of the bottom portion 12a of the body 12 so as to penetrate each of the four through holes 12b and 32b formed in the nut 2 and tightens and fixes the nuts 36 to the respective weld bolts 20. 32 is mounted on the body 12, the bottom surface 12a of the body 12 can be held between the lighting circuit case 32 and the metal plate 18, thereby holding the bottom surface 12a with a stress. Concentration can be prevented from occurring.

Therefore, according to the present embodiment, a large load may be applied to the bottom surface 12a of the body 12 due to the weight of the lighting circuit case 32, vibration transmitted to the headlights while the vehicle is running, and the like. Even so, the possibility of deformation or breakage of the bottom surface 12a due to the reinforcing function of the metal plate 18 can be minimized.

In particular, in the present embodiment, since the lighting circuit case 32 is attached to the outer surface of the bottom portion 12a of the body 12, the bottom portion 12a is easily deformed. This can be effectively suppressed by employing the circuit case mounting structure.

Moreover, in the present embodiment, the bolts for attaching the lighting circuit case 32 to the body 12 are
Since the weld bolt 20 is welded to the metal plate 18, the metal plate 18 is attached to the bottom surface 12 a of the body 12.
The lighting circuit case 32 can be mounted by a simple operation of merely arranging the nut 36 on each weld bolt 20 at a predetermined position on the inner surface and tightening the nut 36.

Since the body 12 in this embodiment is a resin molded product having relatively low rigidity, the metal plate 1
It is particularly effective to adopt a lighting circuit case mounting structure using the light emitting device 8.

Further, in the present embodiment, the cord 30 connecting the discharge bulb 22 and the lighting circuit 34 is provided with the metal plate 18, the bottom surface 12a of the body 12, and the insertion holes 18a, 12c formed in the lighting circuit case 32. And 32c are inserted so that the cord 30 can be easily routed.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a vehicle headlamp according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the vehicle headlamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Headlamp 12 Body (light body) 12a Bottom part 12b Through hole 12c Insertion hole 14 Lens 16 Reflector 18 Metal plate 18a Insertion hole 20 Weld bolt (bolt) 22 Discharge valve 28 Plug 30 Code 32 Lighting circuit case 32a Flange part 32b through hole 32c insertion hole 34 lighting circuit 36 nut

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-16723 (JP, A) JP-A-7-114820 (JP, A) JP-A-7-114805 (JP, A) 50806 (JP, U) UK Patent Application Publication 2277796 (GB, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F21S 8/10 F16B 5/00-5/12

Claims (3)

(57) [Claims] 1. A discharge bulb, a lamp housing the discharge bulb, a lighting circuit for lighting the discharge bulb, and a lighting circuit case mounted on an outer surface of the lamp with the lighting circuit housed therein. A plurality of through holes are formed in each of the lamp body and the lighting circuit case, and a metal plate having bolts welded to a plurality of locations on an inner surface of the lamp body, A headlight for a vehicle, wherein each of the bolts is provided so as to pass through each of the through holes of the lamp body and the lighting circuit case, and a nut is fastened and fixed to each of the bolts. . 2. The vehicle headlight according to claim 1, wherein a mounting position of the lighting circuit case to the lamp body is a bottom portion of the lamp body. 3. The metal plate, the lamp body, and the lighting circuit case, each having an insertion hole through which a cord connecting the discharge bulb and the lighting circuit is inserted is formed. 2. The vehicle headlight according to 2.