JPH071641B2 - Headlight for passing beam - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle headlight, and more particularly to a headlight dedicated to a passing beam.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional headlight 90 for a low beam, which is a paraboloid of revolution having a focal point f behind a light source 91 which is, for example, a filament of a halogen bulb. The reflecting mirror 92 is installed and the light source 9 is provided.
The lower half of the first mirror 1 is covered with the hood 93, and only the reflected light of the upper half of the reflecting mirror 92 that produces downward rays by providing the focus behind the light source 91 is used. By doing so, the light distribution characteristic for the low beam which does not include the dazzling light, that is, the upward light is obtained.

It is to be noted that a lens is provided in front of the reflecting mirror 92 in the irradiation direction, and the light distribution characteristic in which a basic shape is obtained by the light source 91 and the reflecting mirror 92 is further optimized. Has become.

[0004]

However, in the conventional passing beam headlamp 90 having the conventional structure, as is apparent from the above description, the lower half of the light source 91 is attached to the hood 93.
Since the desired light distribution characteristics are obtained by covering the headlight with the light source, the light amount emitted from the light source 91 can be used only at about 50%, and as a result, the headlight is compared with the power consumption of the light source 91. The problem is that 90 becomes dark, that is, the luminous flux utilization rate is low and the efficiency is poor, and the solution to this problem has been a problem.

[0005]

As a concrete means for solving the above-mentioned conventional problems, the present invention provides a low beam headlight having a light source and a reflecting mirror, wherein the reflecting mirror is either above or below. A first rotation parabolic reflection surface which is arranged in approximately one half and reflects the light from the light source as substantially parallel light directed downward appropriately, and a case where the first rotation parabolic reflection surface is arranged are different. The second rotation parabolic reflection surface, which is disposed in the central portion of the half of the side, reflects the light from the light source as substantially parallel light directed downward, and the left and right sides of the second rotation parabolic reflection surface, respectively. A parabolic prismatic surface of two surfaces arranged on the first surface to converge the light in one direction on the first surface and to condense the light on the second surface in a direction orthogonal thereto to direct the reflected light in the irradiation direction of the headlight. And a reflecting surface, wherein the light source emits light from the light source, and the second surface is a parabolic reflecting surface. By providing low beam headlamp, characterized in that a hood covering is intended to solve the conventional problems described above.

[0006]

EXAMPLES Next, the present invention will be described in detail based on the examples shown in the drawings. In the following description, all terms indicating directions such as up, down, front, back, left, and right will be described with reference to a state of sitting on a seat such as a driver's seat.

FIG. 1 shows a first embodiment of a low beam light headlamp 1 (hereinafter, abbreviated as headlight 1) according to the present invention. The point that the light distribution characteristic is basically formed by the light source 2 and the reflecting mirror 3 is similar to that of the conventional example, but according to the present invention, the position of the light source 2 in the upper half part of the reflecting mirror 3 is set. A first rotation parabolic reflection surface 31 having a focal point f1 is arranged rearward of the first rotation parabolic reflection surface 31a and a left first reflection surface 32a formed as a parabolic reflection surface 32a on the left side of the lower half. The left second reflecting surface 32b is arranged, and the left first reflecting surface 32a and the left second reflecting surface 3 are arranged on the right side.
2b has a right first reflecting surface 33a and a right second reflecting surface 33b which are symmetrical with each other, and has a focal point f2 in front of the position of the light source 2 in the center of the lower half. The paraboloidal reflecting surface 34 is arranged, and in addition, the light source 2 is provided with a hood 4 that covers the left second reflecting surface 32b and the right second reflecting surface 33b.

Here, the left first reflection surface 32a, the second left reflection surface 32b, and the right first reflection surface, which are the respective reflection surfaces of the lower half of the reflecting mirror 3 having the above-mentioned structure, particularly the gist of the present invention. 33a,
The configurations of the right second reflection surface 33b and the second rotation parabolic reflection surface 34 will be described. The right first reflecting surface 33a and the right second reflecting surface 33b are the left first reflecting surface 32 as described above.
Since the a and the left second reflecting surface 32b are symmetrical with respect to the vertical centerline CL of the reflecting mirror 3, the description will be given by using the left first reflecting surface 32a and the left second reflecting surface 32b as representatives. I shall.

First, the left first reflecting surface 32a is formed as a parabolic column surface in which a parabola appears in a cross section in one direction of the reflecting surface and a straight line appears in a cross section orthogonal thereto. Is formed so that a parabola appears in the front-rear direction of the left first reflecting surface 32a, and all the light rays from the light source 2 that have entered the left first reflecting surface 32a are installed so as to enter the left second reflecting surface 32b. ing.

On the other hand, the left second reflecting surface 32b is a parabolic prism whose cross section in the left-right direction is a parabola and which is a straight line in the up-down direction, and is a light beam incident from the left first reflecting surface 32a. Is set so as to be reflected to the front of the front of the headlight 1, so that the light of the light source 2 incident on the left first reflecting surface 32a is first converged into a substantially parallel light beam in the second vertical direction. It reaches the reflecting surface 32b, and then is converged by the left second reflecting surface 32b into substantially parallel rays also in the left-right direction.
At this time, since the left second reflecting surface 32b is covered with the hood 4 from the light source 2, it does not reflect the light from the light source 2 by itself.

Here, it is preferable that the left first reflecting surface 32a is formed so that the angles viewed from the light source 2 are substantially the same. As a result, the width becomes narrower at a position closer to the light source 2, and there is room for that. A second paraboloid of revolution 34 having a focal point f2 is provided in front of the position of the light source 2 in the center of the lower half of the reflecting mirror 3.

Next, the operation and effect of the headlamp 1 of the present invention having the above-mentioned structure will be described. FIG. 2 shows a light distribution characteristic D of the headlamp 1 of the present invention. Since the paraboloidal reflective surface 31 has the focal point f1 above the light source 2 and behind the position of the light source 2,
As described in the conventional example, all of the reflected light is a downward ray, and the shape thereof is a substantially semicircular light distribution characteristic d31 of the upper chord.
Therefore, the left first reflecting surface 32a and the left second reflecting surface 32b are
The reflected light from and is first converged into substantially parallel light rays in the vertical direction by the left first reflection surface 32a, and then is converged into substantially parallel light rays in the left and right directions by the second left reflection surface 32b. A spot-shaped light distribution characteristic d32 is obtained, which is projected to the center of the light distribution characteristic d31 from the first rotation parabolic reflection surface 31, and similarly distributed by the right first reflection surface 33a and the right second reflection surface 33b. The light characteristic d33 is also projected at almost the same position.

From the second rotary parabolic reflecting surface 34, the second rotary parabolic reflecting surface 34 has a focal point f2 in front of the position of the light source 2. It becomes a downward ray like the one-turn parabolic reflection surface 31,
The light distribution characteristic d34 projected to the lower center is obtained.

Here, when the light distribution characteristic D is examined in detail, the light distribution characteristic D is equivalent to that of the conventional example.
In addition to 31, light distribution characteristics d32, d33, d34 are added, that is, light distribution characteristics d32, d33, d3.
The alignment characteristic D which is brighter than that of the conventional example is obtained by the amount of 4.

In actual practice, as shown in FIG. 3, for example, in order to easily confirm the left shoulder when driving on the left side, the first paraboloid of revolution corresponding to the conventional one is conventionally implemented. Modifications such as extending the reflecting surface 31 to the lower half portion appropriately are possible.

FIG. 4 shows a second embodiment of the present invention. In the previous embodiment, the first rotation parabolic reflecting surface 31 is arranged on the upper half of the reflecting mirror 3 and the center of the lower half is formed. The second rotation parabolic reflection surface 34 is arranged in the left half of the left half reflection surface 3
2a, the left second reflecting surface 32b, the right first reflecting surface 33a, and the right second reflecting surface 33b are arranged, whereas in this embodiment, the reflecting mirror 5 is vertically inverted.

Along with this, the first rotation parabolic reflection surface 51, which is to be arranged substantially in the lower half of the reflection mirror 5, is the light source 2
Formed as a paraboloid of revolution having a focal point f2 in front of,
A second paraboloid of revolution 54 which is arranged in the center of the upper half of the same reflecting mirror 5 is formed as a paraboloid of revolution having a focal point f1 behind the light source 2, and both of the reflection surfaces 51, 54 are in front. Similar to the above embodiment, slightly downward reflected light is generated.

The left first reflecting surface 52a, the left second reflecting surface 52b, the right first reflecting surface 53a, and the right second reflecting surface 53b, which are respectively arranged on the left and right sides of the second rotation parabolic reflecting surface 54, respectively.
The left first reflection surface 52a and the left second reflection surface 52b are each formed of a parabolic column surface that converges in a direction orthogonal to each other, and the right first reflection surface 53a and the right second reflection surface 53a are substantially the same. The reflecting surface 53b is also configured in the same manner, and the light from the light source 2 is irradiated in the irradiation direction.

Therefore, the operations and effects obtained in the second embodiment are of course exactly the same as those in the first embodiment described above, and therefore detailed description of the operations and effects here is omitted. To do.

[0020]

As described above, according to the present invention, the reflecting mirror is arranged in either the upper half or the lower half, and reflects the light from the light source as a substantially downward parallel light. A second reflecting surface, which is arranged in the center of the half of the opposite side to the first reflecting surface of the parabolic surface and reflects the light from the light source as substantially parallel light directed downward. The parabolic reflecting surface and the second rotating parabolic reflecting surface are respectively arranged on the left and right sides, and the light from the light source is converged in one direction on the first surface and in the direction orthogonal to this on the second surface. And a two-sided parabolic reflecting surface that directs reflected light in the irradiation direction of the headlight, and the light source covers the second-sided parabolic reflecting surface from the light from the light source. By using a low beam headlight with a hood, the light from the light source that was previously blocked by the hood It can be used as a light distribution characteristic of a headlight for a low-beam, thereby improving the luminous flux utilization rate of a light source and providing a headlight for a low-beam, which has an excellent effect on improving traffic safety. It is a thing.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a first embodiment of a low beam headlight according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a light distribution characteristic according to the same embodiment.

FIG. 3 is a front view showing the main part of the first embodiment from the irradiation direction.

FIG. 4 is a perspective view showing a main part of a second embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional example.

[Explanation of symbols]

 1 ... Headlight for passing beam 2 ... Light source 3, 5 ... Reflecting mirror 31, 51 ... First rotating parabolic reflecting surface 32a, 52a ... Left first reflecting surface 32b, 52b ... Left first Two reflecting surfaces 33a, 53a ... right first reflecting surface 33b, 53b ... right second reflecting surface 34, 54 second paraboloidal reflecting surface 4 ... Hood f1, f2 ... Focus

Claims (3)

[Claims] 1. In a low beam headlamp having a light source and a reflecting mirror, the reflecting mirrors are arranged in substantially one half of the upper and lower sides, and the light from the light source is appropriately converted into substantially parallel light directed downward. A first rotation parabolic reflection surface that reflects light and a light emitted from the light source that is arranged in the center of half of the side on which the first rotation parabolic reflection surface is arranged and that is different from that on which the first rotation parabolic reflection surface is arranged. A second rotation parabolic reflection surface that reflects as parallel light, and the light from the light source disposed on each of the left and right sides of the second rotation parabolic reflection surface converges in one direction on the first surface and converges on the second surface. It is composed of a two-sided parabolic reflecting surface that converges in a direction orthogonal to this and directs the reflected light in the irradiation direction of the headlamp, and the light source emits light from the light source to the second surface. A low beam headlight with a hood that covers the reflective surface of the column. 2. The first rotation paraboloidal reflecting surface is disposed in a substantially upper half part as having a focal point rearward of the position of the light source, and the second rotation paraboloidal reflecting surface is at the position of the light source. The headlight for a low beam as claimed in claim 1, wherein the headlight for a low beam is arranged in the center of the lower half so as to have a focal point in the front. 3. The first rotation paraboloidal reflecting surface is disposed in a substantially lower half part as having a focal point in front of the position of the light source, and the second rotation paraboloidal reflecting surface is at the position of the light source. The headlight for a low beam according to claim 1, wherein the headlight for a low beam is provided in the center of the upper half portion so as to have a focal point rearward.