JPH09282905A - Vehicle headlights - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a vehicle headlamp capable of minimizing the risk of clouding or condensation on the inner surface of a lens. SOLUTION: A pair of air holes 54 and 56 are formed in a lower portion near both side end portions of a rear surface portion 12b of a body 12, and an air hole 58 is formed in an intermediate upper portion thereof. Headlight 10
When the temperature of the bulbs 24, 36, 28 rises due to the lighting of, convection occurs inside the lamp body. At that time, the air warmed in the lamp body is discharged from the air hole 58, and the outside air is introduced into the lamp body through the pair of air holes 54 and 56. As a result, clouding or dew condensation most occurs on the inner surface of the lens in the lamp body. Easy to increase the air permeability of the lower corners of both ends.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vehicle headlight,
In particular, it relates to the ventilation structure of the lamp body.

[0002]

2. Description of the Related Art An unsealed vehicular headlamp requires a ventilation structure for preventing fog and dew condensation from occurring inside the lamp body. As this ventilation structure,
As shown in FIGS. 9 and 10, air holes 2a and 2b are formed at upper and lower portions of a body 2 (or a reflecting mirror), and outside air is introduced into the lamp body through the lower air holes 2a to make the upper air holes 2
A structure for discharging from b is known.

[0003]

However, the above-mentioned conventional ventilation structure has a problem that it is not possible to effectively prevent the occurrence of fogging and dew condensation on the inner surface of the lens. For example, in the ventilation structure shown in each of the above drawings, since the lower corner portion where the air hole 2a is not formed in the lamp body has poor air permeability, the inner surface of the lens 4 is located at the portion 4a located at this lower corner portion. However, there is a problem that fogging and dew condensation tend to occur as shown in the figure.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a vehicle headlamp capable of minimizing the risk of clouding or dew condensation on the inner surface of the lens. To do.

[0005]

The present invention is to achieve the above object by devising the arrangement of air holes.

That is, according to the present invention, as described in claim 1, the bulb, the reflecting mirror for reflecting the light from the bulb to the front, the body for housing the reflecting mirror, and the front of the reflecting mirror. A vehicle headlamp comprising a lens arranged and attached to the body,
A pair of air holes are formed in the lower part near both side ends of the body, and an air hole is formed in an intermediate upper part of the pair of air holes in the body, In addition, as described in claim 4,
A vehicle headlamp comprising a bulb, a reflecting mirror that reflects light from the bulb forward, and a lens that is arranged in front of the reflecting mirror and is attached to the reflecting mirror. A pair of air holes are formed in the lower portions near both end portions of the mirror, and an air hole is formed in the middle upper portion of the pair of air holes in the reflecting mirror.

The "lower part" in the "lower part near both end portions" means that the upper edge of the air hole is located below the optical axis of the reflecting mirror, and the "lower intermediate part" in the "intermediate upper part". The “upper part” means that the lower end edge of the air hole is located above the optical axis of the reflecting mirror.

[0008]

When the temperature of the bulb rises due to the lighting of the headlight, convection occurs inside the lamp body. However, in the present invention, the body (or the reflector) has a lower portion near both end portions thereof. Since a pair of air holes are formed and an air hole is formed in the middle upper part, the air warmed in the lamp body is discharged from the air hole in the middle upper part, and the pair of air holes in the lower part near both side ends is formed. The outside air is introduced into the lamp body through the air holes of the. For this reason, it is possible to enhance the air permeability of the lower corner portions on both side end portions where the fog and dew condensation are most likely to occur on the inner surface of the lens in the lamp body.

Therefore, according to the present invention, it is possible to minimize the risk of fogging and dew condensation on the inner surface of the lens.

It goes without saying that the headlight to which the present invention is applied includes a headlight having only one set of the bulb and the reflecting mirror. However, as described in claim 2, the air hole is formed in the body. In the formed headlight, if multiple sets of bulbs and reflecting mirrors are installed side by side inside the body, if both sides of the lower corners of the lens become fogged or condensate Since it becomes easy to obstruct the light distribution performance that should be formed by the reflected light from the reflecting mirror located in the section,
It is particularly effective to adopt the configuration of the present invention. In this case, each of the above-mentioned reflecting mirrors may be independent, or a plurality of reflecting mirrors (in this case, "reflecting portion").
Can also be expressed). Similarly, in a headlight having an air hole formed in a reflecting mirror, a plurality of bulbs are provided and a reflecting portion for reflecting the light from each bulb forward is horizontally provided in the reflecting mirror. If multiple units are installed side by side,
If clouding or dew condensation occurs on the lens inner surface of the lower corners of both ends, it is easy to impair the light distribution performance that should be formed by the reflected light from the reflecting parts located at both ends, so the configuration of the present invention is adopted. This is especially effective.

The horizontal position of the above "intermediate upper air hole" is not particularly limited as long as it is located in the middle of a pair of air holes in the lower part near both ends. However, as described in claim 3 or 5, if this is formed in the vicinity of the reflecting mirror (or reflecting portion) that is paired with the valve having the largest heat generation amount among the plurality of bulbs, then in the lamp body. Convection can be smoothly caused between the air holes in the lower part near both side ends and the air holes in the intermediate upper part, which can enhance the effect of preventing fogging and dew condensation.

The opening diameter of each "air hole" is not particularly limited, but as described in claim 7,
Since it is necessary for the air holes in the middle upper part to generate convection with each of the pair of air holes in the lower part near both ends,
It is preferable to set the opening diameter to be larger than that of each air hole in the lower portion near both end portions.

[0013]

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

First, a first embodiment of the present invention will be described.

FIG. 1 is a front view showing a vehicle headlamp according to this embodiment, and FIGS. 2 and 3 are a sectional view and a rear view taken along line II-II thereof.

As shown in FIGS. 1 and 2, a headlamp 10 according to this embodiment is a combination lamp having a headlamp function and a fog lamp function, and is a lamp body formed by a body 12 and a lens 14. On the mirror 16
Are provided so as to be tiltable in vertical and horizontal directions. The headlamp 10 is a headlamp provided on the right side of the vehicle. The headlamp provided on the left side of the vehicle is symmetrical in structure with respect to the structure of the illustrated headlamp, and has the same left and right light distribution. is there.

The body 12 is an injection-molded product made of resin, and a pair of upper and lower stud bolts 18 and 20 are provided at the outer end in the vehicle width direction, and the body 12 is inward in the vehicle width direction. A bracket 22 having an elongated hole 22a formed at the end is integrally formed with the body 12.

The reflecting mirror 16 includes a reflecting portion 16A for a main lamp of a headlamp, a reflecting portion 16B for both a main lamp and a sub lamp of a headlamp, and a reflecting portion 16C for a fog lamp arranged in series in a horizontal direction. It is integrally formed with.
A point P0 shown in FIG. 1 is an aiming fulcrum where the reflecting portion 16 is supported by the body 12 by a ball joint, and a point P1 is shown.
Is a vertical aiming point at which the reflecting portion 16 is supported by the body 12 so as to be tiltable in the vertical direction via an aiming screw (not shown), and a point P2 is such that the reflecting portion 16 places an aiming screw (not shown). The left and right aiming points are supported by the body 12 so as to be tiltable in the left and right directions.

A halogen bulb 24 having a C-8 type single filament is attached to the reflecting portion 16A on the optical axis Axa, and the reflecting portion 16B is provided.
Is equipped with a C-8 type discharge bulb (metal halide bulb) 26 on its optical axis Axb.
The reflector 16C includes a halogen bulb 28 having a C-6 type single filament on its optical axis Axc.
Is attached. In addition, in the reflecting portion 16B,
The shade 3 should be located in front of the valve 26.
2 are provided. The halogen bulbs 24 and 2
8 is designed to be directly connected to a power source through a connector (not shown), but the discharge bulb 26 requires a high voltage for its lighting, and therefore, the lighting circuit via the plug 36 and the cord 38. After being connected to the lighting circuit 42 housed in the case 40 once, it is connected to the power supply. An aluminum die-cast plug cover 44 is attached to the plug 36, and the cord 38 has a cord main body covered with a mesh type metal shield cover.

As shown in FIG. 2, in front of the reflecting mirror 16 in the lamp body, each reflecting portion 16A of the reflecting mirror 16 is provided.
Extension 64 surrounding 16B and 16C
Is provided.

As shown in FIG. 3, the lighting circuit case 4 is provided.
0 is attached to the body 12 in a state of being covered with a bracket 46 having a substantially U shape. The lighting circuit case 40
Is made of aluminum die cast and is attached to the bracket 46 by a screw 48. The bracket 46 is a press-formed product of a steel plate and is grounded to the vehicle body together with the lighting circuit case 40. The bracket 46 is configured such that a plurality of steel bolts 50 projecting downward from the bottom surface portion 12a of the body 12 are inserted into the body mounting holes of the bracket 46, and the nuts 52 are respectively attached to the bolts 50. By tightening, attachment to the body 12 is performed.

As shown in FIG. 3, the rear surface portion 1 of the body 12
A pair of air holes 54 and 56 penetrating the rear surface portion 12b are formed in the lower portions near both side ends of 2b, and the above-mentioned rear portion is also formed in the middle upper portion of the pair of air holes 54 and 56. An air hole 58 penetrating the surface portion 12b is formed. That is, the air holes 54 and 56 have the reflection portions 16A and 1
The air holes 58 are provided obliquely below the optical axes Axa and Axc of 6C, respectively, and the air holes 58 are provided obliquely above the optical axis Axb of the reflecting portion 16B. The air holes 58 are the air holes 54, 5
The opening diameter is set to be larger than 6.

As shown in FIG. 4, a U-shaped rubber tube 60 is attached to the air hole 58, and as shown in FIG. 5, the air hole 54 has a slightly smaller U-shaped rubber tube. 62 is attached. As shown in FIG. 3, the same rubber tube 62 as that of the air hole 54 is also attached to the air hole 56.

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

When the headlight 10 is turned on, the bulbs 24, 2
When the temperatures of 6 and 28 rise, convection occurs inside the lamp body. At that time, the discharge bulb 26 has a larger amount of heat generation than the other two halogen bulbs 24 and 28. Further, since the discharge bulb 26 is attached to the reflecting portion 16B of the headlamp that also serves as the main light and the sub light,
The lighting time is the longest among the three bulbs 24, 26, 28, and the amount of heat generated is also large in this respect.

In the present embodiment, a pair of air holes 5 are formed in the lower portion of the rear surface portion 12b of the body 12 in the vicinity of both side end portions.
4, 56 are formed, and these air holes 54,
Since the air hole 58 is formed in the upper middle part of 56, the air warmed in the lamp body is discharged from the air hole 58, and the outside air is introduced into the lamp body from the air holes 54 and 56. For this reason, it is possible to enhance the air permeability of the lower corners of both side end portions where the fog and dew condensation are most likely to occur on the inner surface of the lens 14 in the lamp body, and thereby the risk of fogging and dew condensation on the inner surface of the lens 14 is minimized. Can be suppressed to

In particular, in the present embodiment, the air holes 58
However, since it is provided diagonally above the optical axis Axb of the reflecting portion 16B to which the discharge bulb 26 having the longest lighting time and the largest calorific value among the three bulbs 24, 26, 28 is attached, Convection can be smoothly caused between the air holes 54 and 56 at the lower portions near both side ends and the air holes 58, whereby the effect of preventing fogging and dew condensation can be enhanced. Moreover, since the air hole 58 is set to have a larger opening diameter than the air holes 54 and 56,
Convection in the lamp body can be easily caused.

Further, in general, the headlight 1 according to the present embodiment.
When the extension 64 is provided in front of the reflecting mirror 16 in the lamp body as in 0, the reflecting portion 16A,
Convection is less likely to occur between the lamp chambers in front of 16B and 16C, but in the present embodiment, since the air hole arrangement structure as described above is adopted, smooth convection occurs between the lamp chambers. As a result, the effect of preventing the occurrence of fogging and dew condensation can be enhanced.

In the present embodiment, the headlamp 10 provided with the reflecting mirror 16 in which the three reflecting portions 16A, 16B and 16C are integrally formed in a horizontal arrangement in series has been described. As shown, even in the headlight 10 'in which three independent reflecting mirrors 16A', 16B ', 16C' are arranged side by side in the horizontal direction, by adopting the same air hole arrangement structure as in the above embodiment. It is possible to obtain the same effect as that of the above embodiment.

Next, a second embodiment of the present invention will be described.

FIG. 7 is a front view showing a vehicle headlamp according to this embodiment, and FIG. 8 is a sectional view taken along line VIII-VIII thereof.

While the headlamp 10 according to the first embodiment is a reflector-movable headlamp in which a reflector 16 is housed in a lamp body composed of a body 12 and a lens 14, The headlamp 70 according to the embodiment is a unit movable headlamp in which the lens 14 is attached to the reflecting mirror 72 and the reflecting mirror 72 itself constitutes a part of the lamp body.

Further, the headlamp 70 has only a headlamp function, unlike the first embodiment. That is, in the reflecting mirror 72 of the headlight 70, the main lamp reflecting portion 72A of the headlamp and the head lamp sub-light reflecting portion 72B of the headlamp are integrally formed in a horizontal arrangement in series. Has become.

In this headlight 70, the halogen bulb 24 is mounted on the optical axis Axa of the reflecting section 72A, and the discharge bulb 26 is mounted on the optical axis Axb of the reflecting section 72B. , And its peripheral structure are the same as in the first embodiment.

As shown in FIG. 7, a pair of air holes 74 and 76 penetrating the reflecting mirror 72 are formed in the lower portions near both end portions of the reflecting mirror 72, and the reflecting portion 7 is also formed.
The reflecting mirror 72 is also provided near the upper portion between the 2A and the reflecting portion 72B.
An air hole 78 that penetrates through is formed. The air hole 78 is set to have a larger opening diameter than the air holes 74 and 76, and the rubber tube 60 is attached to the air hole 78 and the rubber tube 6 is attached to the air holes 74 and 76.
The points 2 are attached respectively, which is similar to the first embodiment.

Next, the operation of this embodiment will be described.

When the headlight 10 is turned on, the bulbs 24 and 26 are turned on.
When the temperature rises, convection occurs inside the lamp, but a pair of air holes 7 are formed in the lower part near both side ends of the reflecting mirror 72.
4, 76 are formed, and these air holes 74,
Since the air hole 78 is formed in the upper middle part of the lamp 76, the air warmed in the lamp body is discharged from the air hole 78, and the outside air is introduced into the lamp body from the air holes 74 and 76. For this reason, it is possible to enhance the air permeability of the lower corners of both side end portions where the fogging and dew condensation is most likely to occur on the inner surface of the lens 14 in the lamp body, and thereby the risk of fogging and dew condensation on the inner surface of the lens 14 is minimized. Can be suppressed to

Further, since the air hole 58 is set to have a larger opening diameter than the air holes 54 and 56, convection in the lamp body can be easily caused.

[Brief description of drawings]

FIG. 1 is a front view showing a vehicle headlamp according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a rear view of FIG. 1;

4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a view similar to FIG. 2 showing a modified example of the first embodiment.

FIG. 7 is a front view showing a vehicle headlamp according to a second embodiment of the present invention.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a rear perspective view showing a conventional example.

FIG. 10 is a front view showing a conventional example.

[Explanation of symbols]

 10, 10 'Headlight 12 Body 12b Rear surface 14 Lens 16 Reflector 16A, 16B, 16C Reflector 16A', 16B ', 16C' Reflector 24, 28 Halogen bulb 26 Discharge bulb 40 Lighting circuit case 42 Lighting circuit 46 Bracket 54, 56, 58 Air hole 60, 62 Rubber tube 64 Extension 70 Headlight 72 Reflector 72A, 72B Reflector 74, 76, 78 Air hole

Claims (7)

[Claims] 1. A bulb, a reflecting mirror that reflects light from the bulb forward, a body that houses the reflecting mirror, and a lens that is arranged in front of the reflecting mirror and is attached to the body. In a vehicle headlight comprising: a body, a pair of air holes are formed in a lower portion near both end portions of the body, and an air hole is formed in an intermediate upper portion of the pair of air holes in the body. A vehicle headlight characterized by the fact that 2. The vehicle headlamp according to claim 1, wherein a plurality of sets of the bulb and the reflecting mirror are arranged side by side in the horizontal direction inside the body. 3. The vehicle according to claim 2, wherein the air hole in the middle upper portion is formed in the vicinity of a reflecting mirror that forms a pair with a valve having the largest heat generation amount among the plurality of valves. Headlight. 4. A vehicle headlamp comprising a bulb, a reflector for reflecting light from the bulb forward, and a lens arranged in front of the reflector and attached to the reflector. In the lamp, a pair of air holes are formed in a lower portion near both end portions of the reflecting mirror, and an air hole is formed in an intermediate upper portion of the pair of air holes in the reflecting mirror. A headlight for a vehicle. 5. A plurality of said bulbs are provided, and a plurality of reflecting portions for reflecting the light from each of said bulbs forward are arranged side by side in the horizontal direction on said reflecting mirror. The vehicle headlight according to item 4. 6. The vehicle according to claim 5, wherein the air hole in the middle upper portion is formed in the vicinity of a reflecting portion forming a pair with a valve having the largest heat generation amount among the plurality of valves. Headlight. 7. The air holes in the middle upper portion have a larger opening diameter than the air holes in the lower portions near both side ends.
The vehicle headlamp according to any one of claims 1 to 6, characterized in that: