JPH09180508A - Headlight for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform required overhead sign irradiation without reducing light quantity for forming a luminous distribution pattern and without damaging the outside appearance of a luminaire. SOLUTION: Reflecting treatment by chromium plating is performed in a region A on the inner surface of a shade main body 22a of a shade 22 formed so as surround a bulb 18, and non-reflecting treatment by black coating is performed in a region A. Light from a filament 18a reflected in the region B having high reflectance is reflected on a reflecting surface 20a of a reflecting mirror 20, transmitted through a lens 12, and applied to the front upper part of a lighting device. Light necessary for overhead sign irradiation can be obtained without any work of the reflecting mirror 20 and the lens 12. Since the reflecting light from the region A is hardly generated, an adverse effect on formation of luminous distribution pattern can be prevented.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vehicle headlight,
In particular, it relates to the configuration of the shade.

[0002]

2. Description of the Related Art Generally, a vehicle headlamp is constructed so that light from a light source body (filament or the like) of a bulb is controlled by a reflector and a lens to obtain a required light distribution pattern. Further, in recent years, a headlamp has been developed which is configured to obtain a required light distribution pattern by light distribution control using only a reflecting mirror without relying on a lens.

By the way, when upward light is radiated to the front of the lamp, glare is given to an oncoming driver or a pedestrian, so that a light distribution pattern in which the upper light is suppressed as much as possible is obtained when the auxiliary light is turned on. It is essential to On the other hand, if the upper light is not generated at all, there is a problem that a so-called overhead sign such as a road guide plate or a road sign in the upper front becomes difficult to see when the vehicle is driven by the auxiliary light.

Therefore, conventionally, when the lens step 2s is formed on the lens 2 as shown in FIG. 7A, a part 2sA of the lens step 2s is used for overhead sign irradiation. , Again, FIG.
As shown in (b), when the lens 2 is transparent and the light distribution control step 4s is formed on the reflecting mirror 4, a part 4sA of the light distribution control step 4s is used for overhead sign irradiation. Has been devised to generate the required upward light.

[0005]

However, the headlight having the above-described overhead sign irradiation structure has the following problems.

That is, as shown in FIG. 7A, when a part 2sA of the lens step 2s is used for overhead sign irradiation, the part 2sA of the above-mentioned part 2sA is formed to form an original light distribution pattern. The transmitted light becomes a loss, and it is not easy to achieve a design harmony between the portion 2sA and the other portion of the lens step 2s, which causes the appearance of the lamp to deteriorate.

On the other hand, as shown in FIG. 7B, even when a part 4sA of the step 4s for controlling the light distribution is used for the irradiation of the overhead sign, the above-mentioned method is used to form the original light distribution pattern. The reflected light from the portion 4sA is lost, and the portion 4sA and the light distribution control step 4s are lost.
It is not easy to harmonize the design with other parts of the
Since the lens is transparent, it causes the appearance of the lamp to deteriorate. In particular, when the step 4s for controlling the light distribution is formed without step steps to improve the appearance, the fact that the step 4sA is provided causes a step, which is contrary to consideration for improving the appearance. This is not preferable.

The present invention has been made in view of the above circumstances, and a required overhead sign irradiation is performed without reducing the light amount for forming a light distribution pattern and without impairing the appearance of the lamp. The object is to provide a vehicle headlamp that can be operated.

[0009]

SUMMARY OF THE INVENTION In the present invention, attention is paid to the fact that many headlights are provided with a shade for cutting harmful light generated when a sub-light distribution pattern is formed. The above object is achieved by obtaining the overhead sign irradiation light by utilizing the inner surface reflection of the shade.

That is, according to the present invention, as described in claim 1, a bulb having a light source body, a reflecting mirror for reflecting light from the light source body forward, and a lens arranged in front of the reflecting mirror. And a shade surrounding the bulb, the reflectance of a predetermined region of the inner surface of the shade is set to be higher than the reflectance of a region other than the predetermined region, It is a feature.

The position and size of the "predetermined region" are not particularly limited as long as the overhead sign irradiation light can be obtained by the reflected light from the predetermined region.

[0012]

As described above, according to the present invention, the reflectance of a predetermined area of the inner surface of the shade provided so as to surround the bulb is set higher than the reflectance of other areas. Therefore, the following operational effects can be obtained.

That is, the light from the light source, which is reflected in the predetermined area having a relatively high reflectance, is reflected by the reflecting surface of the reflecting mirror and transmitted through the lens, so that the reflecting mirror and the lens are not modified. Without, it is possible to obtain the light required for overhead sign irradiation. On the other hand, since the reflectance is set relatively low in the regions other than the predetermined region,
It is possible to minimize the adverse effect of reflected light from the region on the formation of the light distribution pattern.

Therefore, according to the present invention, required overhead sign irradiation can be performed without reducing the amount of light for forming the light distribution pattern and without impairing the appearance of the lamp.

In the above structure, the specific structure for setting the reflectance of the predetermined region higher than the reflectance of the other regions is not particularly limited, but, for example,
As described in claim 2, it is possible to adopt a configuration in which the predetermined region is subjected to the reflection treatment and the other region is subjected to the non-reflection treatment, and by adopting such an aggressive constitution, the predetermined region is adopted. The reflectance of the shade can be set extremely high, while the reflectance of other regions can be set extremely low, so that the overhead sign irradiation light is secured by the shade inner surface reflection and the adverse effect on the light distribution pattern formation due to the shade inner surface reflection is prevented. It becomes easy to satisfy both.

The type of the headlamp to which the present invention is applied is not particularly limited, but as described in claim 3, a light distribution control step is formed on the reflecting surface of the reflecting mirror. In the case of a headlight that does not have a lens step formed on the lens, the reflective surface of the reflector inside the lamp can be seen well through the lens, so some of the steps for light distribution control above should be performed for overhead sign irradiation. If this is used, this portion will have a surface shape that is significantly different from the other portions of the light distribution control step, and this will cause the appearance of the lamp to deteriorate.
Adopting the configuration of the present invention is effective because there is no fear of such a deterioration in appearance. Particularly, when the reflecting surface does not have a step difference between the light distribution control steps as described in claim 4, the step is performed only on the portion for the overhead sign irradiation of the light distribution control step. This is particularly effective because a step is formed and stands out.

In the invention of the present application, the shape of the shade is not particularly limited, but as described in claim 5, it has a shape such that the direct light from the light source body is incident only on the reflecting surface. When setting the shade shape,
It is particularly effective to adopt the configuration of the present invention. That is, when the shade shape is set in this way,
While it is possible to completely prevent stray light that is not necessary for forming the light distribution pattern and reliably prevent glare, the overhead sign irradiation light is no longer obtained, so the irradiation direction was confirmed as in the present invention. By performing the overhead sign irradiation using the shade inner surface reflected light, it is possible to secure the overhead sign irradiation light while controlling the generation of stray light.

As described above, the formation position of the predetermined area is not particularly limited. However, when the light distribution pattern is formed while cutting stray light, the upper side on the opposite lane becomes particularly dark. Since it is easy, it is effective to set the reflected light in the predetermined area to a position where it can be irradiated upward on the opposite lane side through the reflecting surface and the lens, as described in claim 6.

Further, the shade usually has a shade main body and a leg portion for supporting the shade main body on a reflecting mirror as described in claim 7, but in such a case, the predetermined region is provided. By setting it in the vicinity of the leg portion of the shade body, it becomes easy to set the predetermined area to a relatively higher reflectance than other areas.

[0020]

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.

The headlight 10 is a so-called two-light headlight mounted on a two-wheeled vehicle (corresponding to a four-light headlight in a four-wheeled vehicle), and is formed by a lens 12 and a body 14. A main-light reflecting mirror unit and a sub-light reflecting mirror unit are arranged so as to be aimable in the lamp chamber. The illustrated reflecting mirror unit 16 is a reflecting mirror unit for a sub lamp. The reflecting mirror unit 16 includes a bulb 18, a reflecting mirror 20, and a shade 22.

Reflecting mirror unit 1 in the lens 12
The front part of 6 is formed as a transparent lens having no light distribution control function. The lens 12 has an effective portion 1
2a is formed in a step shape so as to be flush with the vehicle body side cowl 102, and is in contact with the vehicle body side cowl 102 via the end covers 24 above and below the effective portion 12a. Further, an inner cover 26 is arranged on the inner surface side of the lens 12 so as to hide a portion other than the reflecting surface 20a of the reflecting mirror 20 inside the lamp. The lens 12 and the inner cover 26 are attached to the body 14 via a sealant 28. This body 1
A socket cover 30 is attached to the rear end opening of the No. 4.

The valve 18 is an H7 valve having a so-called C-8 type single filament 18a. An adapter 32 is attached to the valve 18, and the socket cover 3 is attached to the adapter 32.
0 is attached.

The above-mentioned reflecting mirror 20 is a reflecting mirror made of FRP, and its reflecting surface 20a has, as shown in FIG.
(For right light distribution) is formed. As shown in FIG. 3, these light distribution control steps 20s are formed in a cross-sectional corrugated shape having no step difference. The reflecting mirror 20 is formed from the filament 18a (light source body) of the bulb 18 to the reflecting surface 2
The light incident on the light source 0a is subjected to light distribution control in the light distribution control step 20s to form a right light distribution pattern P as shown by a solid line in FIG. Further, as shown in FIG. 2, a hole 20c for allowing formation of a pair of shade mounting portions 20b and a valve fixing spring locking portion is formed in the vicinity of the rear top portion of the reflecting surface 20a. .

The shade 22 is a shade body 22a.
2 and 4, and as shown in FIGS. 2 and 4, the pair of claws 22c of each leg 22b are attached and fixed to the reflecting mirror 20 so as to abut against the shade attachment portion 20b. ing. The shade body 22a is formed in an umbrella shape so as to surround the bulb 18, and has a rear end surface 22a.
d is set in a shape such that the direct light from the filament 18a is incident only on the reflecting surface 22a. As a result, harmful stray light generated during the formation of the light distribution pattern, such as direct light to the front of the lamp, reflected light from the upper and lower inner wall surfaces of the reflecting mirror 20, reflected light from the inner cover 26, etc., can be surely cut. Has become.

The shade 22 is entirely plated with chrome in order to improve the appearance quality of the lamp.
However, a region A (region indicated by a mesh line in FIGS. 1 and 4) on the inner surface of the shade body 22a is subjected to heat-resistant black coating treatment on the chrome-plated layer. As is clear from FIG. 4, the shade body 22a
The area B other than the area A (that is, the area not subjected to the black coating treatment) B on the inner surface of the shade is set near the rear end surface 22c of the shade body 22a and near the pair of legs 22b. The chrome-plated layer is formed so as to remain in a substantially rectangular shape. As a result, the area A
Represents a non-reflection processed area, and the area B constitutes a reflection processed area. Of the light incident on the inner surface of the shade body 22a from the filament 18a, the incident light on the region A is almost absorbed and no reflected light is generated, while the incident light on the region B is reflected at a certain reflectance. Then, the light is incident on the reflecting surface 20a of the reflecting mirror 20. As shown in FIG. 1, the light reflected by the region B and incident on the reflecting surface 20a becomes slightly upward light, passes through the lens 12, and is emitted to the front of the lamp. The light emitted in this manner is, as shown by the broken line in FIG. 5, slightly above the line H-H (horizontal line passing through the central axis Ax of the lamp) and the line V-V (central axis Ax of the lamp).
A relatively weak overhead sign irradiating light (50 to 400 cd) that spreads slightly over the vertical line
Illumination light) Pohs. Then, this overhead sign irradiation light Pohs irradiates the overhead sign OHS installed above and in front of the vehicle on the vehicle traveling path. In FIG. 5, L1 is a road center line, and L2 and L3 are road side edge lines of the own lane and the oncoming lane.

As described above in detail, in this embodiment, the region B of the inner surface of the shade body 22a of the shade 22 provided so as to surround the bulb 18 is subjected to the reflection treatment by chrome plating, Since the antireflection treatment by black coating is applied to A, the following effects can be obtained.

That is, the light from the filament 18a reflected in the region B having a high reflectance is reflected by the reflecting surface 2 of the reflecting mirror 20.
Since the light is reflected by 0a, passes through the lens 22, and is emitted toward the upper front of the lamp, the light necessary for the illumination of the overhead sign can be obtained without making any action on the reflecting mirror 20 and the lens 22. On the other hand, since the reflected light from the area A is hardly generated, it is possible to prevent the adverse effect on the light distribution pattern formation due to this.

Therefore, according to this embodiment, the required overhead sign irradiation can be performed without reducing the light amount for forming the light distribution pattern and without impairing the appearance of the lamp.

In particular, the reflecting mirror 20 in this embodiment is
Since the reflecting surface 20a does not have a step difference between the light distribution control steps 20s, if a part of the light distribution control step 20s is used for overhead sign irradiation, the step is performed only for that portion. Since the step difference is formed, the step difference becomes very conspicuous through the transparent lens 12, but in the present embodiment, there is no possibility of causing such deterioration in appearance.

Further, in the headlight 10 according to this embodiment, the shape of the shade book 22a of the shade 22 is set so that the direct light from the filament 18a is incident only on the reflecting surface 20a, Since there is almost no possibility that part of the stray light accidentally becomes the overhead sign irradiation light, the configuration of the present embodiment in which the overhead sign irradiation is performed using the shade inner surface reflected light whose directionality has been confirmed is particularly effective. is there.

In this embodiment, the region B is set in the vicinity of the leg portion 22b of the shade body 22a,
Since the chrome-plated portion that is continuous with the leg portions 22b is configured, it is possible to easily perform masking or the like when performing the black coating treatment of the area A.

In the above embodiment, the filament 18a is used as the light source body, but other light source bodies (for example, a discharge light emitting portion in a metal halide lamp).
Of course, can be adopted.

In the above embodiment, the two-lamp type headlamp for a two-wheeled vehicle has been described, but a similar configuration can be adopted for a one-lamp type headlamp, and further for a four-wheeled vehicle. A similar configuration can be adopted for the headlight, and in these cases, the same effect as the above embodiment can be obtained.

Further, in the above embodiment, the headlight for right light distribution has been described, but the same configuration can be adopted for the headlight for left light distribution. In this case,
The light distribution pattern P of the left light distribution and the overhead sign irradiation light Pohs as shown in FIG. 6 are obtained, and it is possible to obtain the same effects as those of the above embodiment.

[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 a II of FIG. 1 showing a reflector unit of the headlight.
Direction arrow view

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is an IV of FIG. 2 showing the shade of the headlight as a single item.
a direction arrow view (a) and IVb direction arrow view (b)

FIG. 5 is a light distribution pattern showing the operation of the above embodiment.

FIG. 6 is a light distribution pattern showing an operation of a modified example of the above embodiment.

FIG. 7 is a perspective view showing a conventional example.

[Explanation of symbols]

 10 Vehicle headlamp 12 Lens 12a Effective portion 14 Body 16 Reflecting mirror unit 18 Bulb 20 Reflecting mirror 20a Reflecting surface 20b Shade mounting portion 20c Hole 20s Light distribution control step 22 Shade 22a Shade body 22b Leg 22c Claw 22d Rear end surface 26 Inner cover Ax Central axis of lamp A Non-reflective treatment area B Reflective treatment area (predetermined area) L1 Road center line L2 Road side edge line of own lane L3 Road side edge line of oncoming lane OHS overhead sign P Light distribution pattern Pohs Overhead sign Irradiation light

Claims (7)

[Claims] 1. A vehicle comprising a bulb having a light source, a reflector for reflecting light from the light source forward, a lens arranged in front of the reflector, and a shade surrounding the bulb. The vehicle headlamp, wherein the reflectance of a predetermined region of the inner surface of the shade is set higher than the reflectance of a region other than the predetermined region. 2. The vehicle headlamp according to claim 1, wherein the predetermined region is subjected to a reflection treatment and the region other than the predetermined region is subjected to a non-reflection treatment. 3. The vehicle headlamp according to claim 1 or 2, wherein a light distribution control step is formed on the reflecting surface, and the lens step is not formed on the lens. 4. The vehicle headlamp according to claim 3, wherein the reflective surface has no step difference between the light distribution control steps. 5. The vehicle according to claim 1, wherein the shape of the shade is set so that the direct light from the light source body is incident only on the reflecting surface. Headlight. 6. The predetermined area is set to a position where light from the light source body, which has been reflected by the predetermined area, then reflected by the reflecting surface, and transmitted through the lens, can be radiated upward toward the opposite lane. The vehicle headlight according to any one of claims 1 to 5, wherein 7. The shade has a shade body and a leg portion for supporting the shade body on a reflecting mirror, and the predetermined region is set in a portion near the leg portion of the shade body. The vehicle headlamp according to any one of claims 1 to 6, characterized in that: