JP3122034B2 - Vehicle headlights - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A non-sealed vehicle headlamp requires a ventilation structure to prevent fogging and dew formation 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 the body 2 (or the reflecting mirror), and outside air is introduced into the lamp body from the lower air holes 2a to form the upper air holes 2a.
A structure for discharging from b is known.

[0003]

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

The present invention has been made in view of such circumstances, and has as its object to provide a vehicular headlamp capable of minimizing the possibility of fogging or dew formation on the inner surface of a lens. Is what you do.

[0005]

According to the present invention, the above object is achieved by devising the arrangement of air holes.

That is, according to the present invention, as described in claim 1, a bulb, a reflecting mirror for reflecting light from the bulb forward, a body for housing the reflecting mirror, and a front of the reflecting mirror are provided. And a lens mounted on the body and arranged on the body,
A pair of air holes is 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 plurality of sets of the reflecting mirrors are arranged side by side in the horizontal direction, and the middle upper air hole is formed in the vicinity of a reflecting mirror paired with a valve having the largest calorific value among the plurality of valves. And a valve as described in claim 2,
A vehicular headlamp comprising: a reflector for reflecting light from the bulb forward; and a lens disposed in front of the reflector and attached to the reflector. A pair of air holes is formed in a lower portion near the end portion, and an air hole is formed in an intermediate upper portion of the pair of air holes in the reflecting mirror. A plurality of reflectors for reflecting light from each of the bulbs in a forward direction are arranged side by side in a horizontal direction, and the air hole in the middle upper portion is a reflection pair that forms the largest calorific value of the plurality of bulbs. And being formed near the portion.

[0007] The term "lower" in the "lower portion near both end portions" means that the upper end edge of the air hole is located below the optical axis of the reflecting mirror. “Up” means that the lower edge of the air hole is located above the optical axis of the reflector.

[0008]

When the temperature of the bulb rises due to the lighting of the headlamp, convection occurs inside the lamp body. In the present invention, however, the body (or the reflecting mirror) is provided at the lower portion near both side ends 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 a pair of lower parts near both side ends is formed. The outside air is introduced into the lamp body from the air hole of the lamp. For this reason, it is possible to enhance the air permeability of the lower corner portions on both side ends where fogging 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 possibility of fogging or dew formation on the inner surface of the lens.

Further, in a headlamp having an air hole formed in a body, when a plurality of sets of bulbs and reflectors are arranged in a horizontal direction inside the body, If fogging or condensation occurs on the inner surface of the lens at the lower corners on both sides, light distribution performance to be formed by light reflected from the reflectors located on both sides is likely to be impaired. Is particularly effective. In this case, each of the reflecting mirrors may be independent, or a plurality of reflecting mirrors (in this case, also referred to as “reflecting portions”) may be integrally formed. . Similarly, as described in claim 2,
In the case of a headlamp in which an air hole is formed in a reflector, a plurality of bulbs are provided, and a plurality of reflectors for reflecting light from each bulb forward in the reflector are arranged side by side in the horizontal direction. If fogging or dew condensation occurs on the inner surface of the lens at the lower corners on both sides, the light distribution performance to be formed by the reflected light from the reflectors located on both sides is likely to be impaired. Adoption is particularly effective.

Further, in the present invention, since the "air hole in the middle upper portion" is formed near a reflecting mirror (or reflecting portion) paired with a valve having the largest heat value among a plurality of valves, In the lamp body, convection can be smoothly generated between each air hole in the lower portion near both side end portions and the air hole in the middle upper portion, thereby improving the effect of preventing fogging and dew condensation.

Although the opening diameter of each of the "air holes" is not particularly limited, as described in claim 3, the air holes in the middle upper part are each a pair of air holes in the lower part near both ends. Since it is necessary to generate a convection between the air holes, it is preferable to set the opening diameter to be larger than each of the air holes in the lower portion in the vicinity of 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 the present embodiment, and FIGS. 2 and 3 are a sectional view taken along line II-II and a rear view thereof.

As shown in FIGS. 1 and 2, a headlamp 10 according to the present 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. 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 article made of resin, and has a pair of upper and lower stud bolts 18 and 20 provided at outer ends in the vehicle width direction. At the end, a bracket 22 having an elongated hole 22 a is formed integrally with the body 12.

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

The reflector 16A is provided with a halogen bulb 24 having a C-8 type single filament on its optical axis Axa.
Has a C-8 type discharge bulb (metal halide bulb) 26 mounted on its optical axis Axb,
The reflecting section 16C has a halogen bulb 28 having a C-6 type single filament on its optical axis Axc.
Is attached. In addition, the reflecting portion 16B includes:
The shade 3 is located in front of the valve 26.
2 are provided. The halogen bulbs 24 and 2
8 is directly connected to a power supply via a connector (not shown). However, since the discharge bulb 26 requires a high voltage for its lighting, a lighting circuit is connected via a plug 36 and a cord 38. After being once connected to the lighting circuit 42 housed in the case 40, it is connected to a power supply. A plug cover 44 made of aluminum die casting is attached to the plug 36, and the cord 38 has a structure in which the cord body is covered by 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,
Extension 64 so as to surround 16B and 16C
Is provided.

As shown in FIG. 3, the lighting circuit case 4
Numeral 0 is attached to the body 12 while being covered by a substantially U-shaped bracket 46. 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 protruding downward from the bottom surface 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 1 of the body 12
A pair of air holes 54 and 56 penetrating the rear surface portion 12b are formed in the lower portion near both side end portions of the pair of air holes 2b. An air hole 58 penetrating through the surface portion 12b is formed. That is, the air holes 54 and 56 are connected to the reflecting portions 16A and 1A.
6C are provided diagonally below the optical axes Axa and Axc, respectively, and the air holes 58 are provided diagonally above the optical axis Axb of the reflection section 16B. The air holes 58 are 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. As shown in FIG. 5, a slightly small U-shaped rubber tube is provided in the air hole 54. 62 are attached. As shown in FIG. 3, the same rubber tube 62 as the air hole 54 is 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 temperature of 6, 28 rises, convection occurs inside the lamp body. At that time, the discharge bulb 26 generates a larger amount of heat than the other two halogen bulbs 24 and 28. Further, since the discharge bulb 26 is attached to the reflector 16B serving as both the main lamp and the sub lamp of the headlamp,
The lighting time is the longest among the three bulbs 24, 26, and 28, and also in this respect, the calorific value is large.

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 near both ends.
4, 56 are formed, and these air holes 54,
Since the air hole 58 is formed in the middle upper portion of the lamp 56, the air heated 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 increase the air permeability of the lower corners at both end portions where fogging and dew condensation are most likely to occur on the inner surface of the lens 14 in the lamp body, thereby minimizing the possibility of fogging and dew formation on the inner surface of the lens 14. Can be suppressed.

In particular, in this embodiment, the air holes 58
However, since it is provided diagonally above the optical axis Axb of the reflector 16B to which the discharge bulb 26 having the longest lighting time and the largest heat generation among the three bulbs 24, 26, 28 is attached, the lamp body Convection can be smoothly generated between the air holes 54 and 56 and the air holes 58 in the lower portion near the both end portions, thereby improving the effect of preventing fogging and condensation. Moreover, since the air hole 58 is set to have a larger opening diameter than the air holes 54 and 56,
Convection within the lamp body can easily occur.

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,
Although convection hardly occurs between the lamp chambers in front of 16B and 16C, in the present embodiment, since the air hole arrangement structure as described above is employed, it is necessary to smoothly generate convection between the lamp chambers. This can enhance the effect of preventing fogging and condensation.

In this embodiment, the headlamp 10 having the reflecting mirror 16 in which three reflecting portions 16A, 16B, and 16C are integrally formed in a horizontal series is described. As shown, the headlamp 10 'in which three independent reflecting mirrors 16A', 16B ', and 16C' are arranged in a horizontal direction also employs the same air hole arrangement structure as in the above embodiment. The same operation and effect as those of the above embodiment can be obtained.

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

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

The headlamp 10 according to the first embodiment is a movable headlamp of a reflecting mirror type in which a reflecting mirror 16 is accommodated in a lamp body composed of a body 12 and a lens 14. The headlight 70 according to the embodiment is a unit movable headlight in which the lens 14 is attached to the reflecting mirror 72 and the reflecting mirror 72 itself forms a part of a lamp body.

The headlight 70 has only a headlamp function unlike the first embodiment. That is, the reflecting mirror 72 of the headlight 70 is formed by integrally forming a reflecting portion 72A for a main lamp of a headlamp and a reflecting portion 72B for both a main lamp and a sub-lamp of a headlamp in series in a horizontal direction. Has become.

In the headlight 70, the halogen bulb 24 is mounted on the optical axis Axa of the reflector 72A, and the discharge bulb 26 is mounted on the optical axis Axb of the reflector 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 through the reflecting mirror 72 are formed below the reflecting mirror 72 near both ends.
The reflection mirror 72 is also provided near the upper portion between the reflector 2A and the reflector 72B.
Is formed. The point that the air hole 78 is set to have a larger opening diameter than the air holes 74 and 76, the rubber tube 60 is attached to the air hole 78, and the rubber tube 6 is inserted into the air holes 74 and 76.
2 are attached as in the first embodiment.

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

When the headlight 10 is turned on, the bulbs 24, 26
When the temperature rises, convection occurs inside the lamp body, but a pair of air holes 7
4 and 76 are formed, and these air holes 74 and
Since the air hole 78 is formed in the middle upper portion 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 increase the air permeability of the lower corners at both end portions where fogging and dew condensation are most likely to occur on the inner surface of the lens 14 in the lamp body, thereby minimizing the possibility of fogging and dew formation on the inner surface of the lens 14. Can be suppressed.

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 generated.

[Brief description of the 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 modification of the first embodiment;

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

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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F21S 8/10 F21V 31/03 F21W 101: 10

Claims (3)

(57) [Claims] 1. A bulb, a reflector for reflecting light from the bulb forward, a body for housing the reflector, a lens disposed in front of the reflector and attached to the body, A pair of air holes is formed at a lower portion near both side ends of the body, and an air hole is formed at an intermediate upper portion of the pair of air holes in the body. A plurality of sets of the bulb and the reflecting mirror are arranged in a horizontal direction inside the body, and the air hole in the middle upper portion is paired with a valve having the largest heat generation among the plurality of valves. A vehicle headlight formed near a reflector. 2. A vehicle headlight comprising: a bulb; a reflector for reflecting light from the bulb forward; and a lens disposed in front of the reflector and attached to the reflector. In the lamp, a pair of air holes is formed at a lower portion near both end portions of the reflector, and an air hole is formed at an intermediate upper portion of the pair of air holes in the reflector. A plurality of reflectors for reflecting light from the respective bulbs forward in the reflector in a horizontal direction, and the air hole in the upper middle portion is the most heat generating amount of the plurality of bulbs. Is formed in the vicinity of a reflection part which forms a pair with a large bulb. 3. The air hole in the upper middle portion has a larger opening diameter than each air hole in the lower portion near the both end portions.
The vehicle headlight according to claim 1 or 2, wherein