JPH10208509A - Headlight for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headlight for vehicle with its extremely wide illumination angle by continuously connecting light distribution due to the light from a first reflection face and light distribution due to the light from a second reflection face on light distribution characteristics as the headlight for vehicle. SOLUTION: Light distribution characteristics generated from a first reflection face 3 has a light distribution width β of 40 degrees each on the left and right in vertical direction. If light distribution characteristics generated from a second reflection face 4 has a light distribution width γ each at the left and right in horizontal direction similarly, an angle α formed by an optical axis X of the reflection face 4 is near 60 degrees with respect to an optical axis Z of the reflection face 3. By setting thus, light distribution of both reflection faces 3 and 4 are continuously connected, and comprehensive light distribution characteristics from the right of 30 degrees to the left of 90 degree can be provided. A headlight 1 for vehicle is symmetrical on the left and right, the left and right symmetrical light distribution characteristics are provided from the left of 90 degrees to the right of 90 degrees with a pair being comprehensive, and the same visibility is provided with respect to left and right bent curved paths.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlamp for a vehicle such as an automobile, and more particularly, to securing insufficient illuminance on a traveling direction side when a vehicle passes a curved road such as a winding mountain road. It relates to the configuration of a headlight that can be used.

[0002]

2. Description of the Related Art In vehicles, particularly automobiles and two-wheeled vehicles, which travel on a curved road or make a right or left turn at an intersection, headlights are provided not only in the forward direction of the vehicle but also in the right and left directions. It is desirable that the headlamp has a wide irradiation range in the direction, but since the headlight described above is mounted on the front of the vehicle in the traveling direction, the limit is usually about 45 ° to the left and right. It is difficult to obtain a wide irradiation angle.

[0003] Therefore, what is performed is the installation of a cornering lamp 80 shown in FIG. 2, for example, a headlight provided with a headlight light source 91, a headlight reflecting mirror 92 and a front lens 93. In the lamp body 90, a corner light source 81 and a corner reflecting mirror 82 are provided so as to obtain an irradiation direction lateral to the traveling direction.

At this time, the front lens 93 is formed so as to turn to the side of the vehicle body,
It is assumed that the lens also serves as a lens. The cornering lamp 80 may be formed separately and provided on the side surface of the vehicle body. The cornering lamp 80 is not always lit at night, but is lit in conjunction with, for example, a direction indicator lamp.

[0005]

However, in the above-described conventional cornering lamp 80, first, at least one set of each of the left and right corner dedicated light sources 81 and corner reflecting mirrors 82 is required. Secondly, the problem arises that the cost is increased, and secondly, since the lighting is not turned on when the turning light is not used, the visibility cannot be secured in a situation where the turning light is not turned on, for example, a hairpin curve such as a mountain road. There are points, and the solution of these points is an issue.

[0006]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, one light source and a parabolic surface for reflecting the light from the light source in the traveling direction of the vehicle. A first reflecting surface as a system, a second reflecting surface as an ellipsoidal system for reflecting light from the light source toward the side on which the vehicle headlight is provided, and And an inner lens provided in the optical path of the reflected light from the reflective surface, and an optical path between the light from the first reflective surface and the light from the second reflective surface after passing through the inner lens. An outer lens, and the light distribution by the light from the first reflection surface and the light distribution by the light from the second reflection surface are continuous on the light distribution characteristics as the vehicle headlamp. It is an object of the present invention to provide a vehicular headlamp characterized by that.

[0007]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 is a vehicle headlamp according to the present invention. The vehicle headlamp 1 includes a light source 2 such as an H4 halogen bulb.
And an optical axis Z having a substantially focal point f0 in the light source 2 and coinciding with the traveling direction of the vehicle, and a parabolic surface such as a rotating parabolic surface that generates reflected light of substantially parallel rays toward the optical axis Z A first reflecting surface 3 is provided as a system.

In addition, according to the present invention, an ellipsoidal system such as a spheroidal surface, in which the light source 2 is the first focal point f1 and the second focal point f2 is provided with an optical axis X directed laterally to the traveling direction of the vehicle. And a second reflecting surface 4. If the vehicle headlamp 1 is mounted on the left side of the vehicle body, the second focal point f2 of the second reflection surface 4 reflects the reflected light as the left side of the first focal point f1. Vehicle headlight 1
Is configured to be reflected toward the side on which the is provided.

At this time, the optical axis Z of the first reflecting surface 3
And the angle α formed by the optical axis X toward the side of the second reflecting surface 4, as will be described later, the overall light distribution characteristics of the first reflecting surface 3 and the second reflecting surface 4 When forming, both reflective surfaces 3, 4
Are set so that the light distribution from the light source is continuous.

In the optical path after the reflected light from the second reflecting surface 4 passes through the second focal point f2, for example, an inner lens 5 provided with a Fresnel lens cut 5a is provided, and An outer lens 6 that covers the reflective surface 3, the second reflective surface 4, and the inner lens 5 is provided. At this time, the outer lens 6 is formed so as to be appropriately turned to the side of the vehicle body.

Next, the operation and effects of the vehicle headlamp 1 according to the present invention having the above-described structure will be described. In the description, it is assumed that the vehicle headlamp 1 is mounted on the left side in the traveling direction of the vehicle, and the light source 2 is an H4 having a passing filament 2a and a traveling filament 2b.
It is assumed that the lamp is a halogen bulb, and the same filaments 2a and 2b as those of the conventional headlamp are arranged on the first reflecting surface 3.

First, when the passing filament 2a is turned on, the first reflecting surface 3 is a parabolic reflecting surface such as a paraboloid of revolution, and the passing filament 2a is moved to the lower half. Since the light is covered and is disposed at an appropriate distance ahead of the focal point f0 of the first reflecting surface 3 in the irradiation direction, the reflected light is generated in the upper half of the reflecting surface 3 and the upward light Is suitable for passing light distribution that does not occur.

At this time, since the light from the same passing filament 2a reaches the second reflecting surface 4, reflected light is similarly generated in the upper half of the second reflecting surface 4, and The reflected light once converged to the focal point f2 has a shape suitable for passing light distribution that does not generate upward light, like the first reflecting surface 3, and the light from each of the reflecting surfaces 3, 4 is
For example, diffusion in the horizontal direction is appropriately performed by the inner lens 6 or the outer lens 5.

Here, suppose that the light distribution characteristic generated by the first reflecting surface 3 has a light distribution width β of 40 ° in each of the left and right directions in the horizontal direction, and is generated by the second reflecting surface 4. Similarly, if the light distribution characteristics have a light distribution width γ of 30 ° each in the left and right directions in the horizontal direction,
If the angle α formed by the optical axis X of the second reflecting surface 4 is set to be close to 60 °, the light distribution of the two reflecting surfaces 3 and 4 will be seamlessly connected, and the total from 30 ° right to 90 ° left Is obtained.

Needless to say, the vehicle headlamp 1 is composed of a pair having left-right symmetrical characteristics.
, And the same visibility can be obtained both for a curved road that turns to the left and a curved road that turns to the right.

Further, when the traveling filament 2b is turned on, the overall light distribution characteristic having an irradiation width substantially similar to that of the passing filament 2a can be obtained. However, since the lower half of the traveling filament 2b is not covered, the light reaches the entire surface of both the first reflecting surface 3 and the second reflecting surface 4, and the obtained light distribution characteristics are high. Although the light distribution is included, the traveling light distribution is originally selected when there is no oncoming vehicle, so that there is no practical problem.

Therefore, according to the present invention, one light source 2
, The first reflecting surface 3, the second reflecting surface 4, the inner lens 5, and the outer lens 6 make it possible to obtain the vehicle headlamp 1 having an extremely wide irradiation angle in the horizontal direction. Since the first reflecting surface 3 and the second reflecting surface 4 can be integrated, the above-described function can be obtained substantially only by adding the inner lens 5.

[0018]

As described above, according to the present invention, 1
Two light sources, a first reflecting surface that is a parabolic system that reflects light from the light sources toward the traveling direction of the vehicle, and light from the light sources on the side where the vehicle headlight is provided. A second reflecting surface that is an ellipsoidal system that reflects toward the side, an inner lens provided in an optical path of light reflected from the second reflecting surface, and light from the first reflecting surface. An outer lens provided on an optical path with light from the second reflection surface after passing through the inner lens, and light distribution by light from the first reflection surface and light from the second reflection surface. The light distribution by this is a vehicle headlamp that is continuous on the light distribution characteristics of this vehicle headlamp, so that it does not need to provide additional lighting such as cornering lamps in the horizontal direction as in the conventional example. A vehicle headlamp with an extremely wide irradiation angle can be obtained, reducing costs. In which exhibits the excellent effect.

Also, since a single light source can provide a light distribution characteristic having an extremely wide irradiation angle in the horizontal direction, power consumption does not increase and it is not necessary to turn off the light as in a conventional cornering lamp. In this way, it is possible to always run with the above light distribution characteristics, improving the visibility from the driver side, improving the visibility from oncoming vehicles and pedestrians, and extremely improving safety. It works.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vehicle headlight 2 ... Light source 2a ... Passing filament 2b ... Running filament 3 ... First reflection surface 4 ... Second reflection surface 5 ... Inner lens 6 ... Outer lens

Claims (1)

[Claims] 1. A light source, a first reflecting surface of a parabolic system for reflecting light from the light source toward the traveling direction of the vehicle, and a vehicle headlight for transmitting the light from the light source. A second reflecting surface which is an ellipsoidal system that reflects toward the side of the side provided with, an inner lens provided in an optical path of light reflected from the second reflecting surface, and the first lens An outer lens provided in an optical path of light from the reflection surface and light from the second reflection surface after passing through the inner lens, and light distribution by light from the first reflection surface and the second light distribution. And a light distribution by the light from the reflection surface of the vehicle headlight is continuous on a light distribution characteristic of the vehicle headlight.