DE2261054C3 - Vehicle headlights with asymmetrical light distribution - Google Patents

Description

The invention relates to a vehicle headlight with an asymmetrical light distribution the cut-off line between the oncoming traffic that runs horizontally Section and its uphill section facing away from the oncoming traffic has a step.

In the known and predominantly z. Currently used headlights with asymmetrical low beam the asymmetrical design of the light distribution is achieved by the asymmetrical design of the low beam source partially covering, hood-like umbrella, which is not from the umbrella acted upon part of the reflector is limited by a solid angle of about 165 °. To the light on the right To reinforce the roadside (in right-hand traffic), the lens is in one on the side of the oncoming traffic lying, sector-like area provided with prisms that cover most of the area over the horizontal center plane light directed upwards along the ascending section of the cut-off line to the Bend towards the middle of the lane. In this way, dipped lighting that does not disturb oncoming traffic can be used Achieve, through which the right edge of the road is preferably illuminated.

However, it has been shown that the range of such a low beam for a fast trip on Roads with separate lanes for each direction of traffic are insufficient. A general shift in However, the cut-off line to the front is not possible, since the oncoming traffic then follows that of the oncoming traffic used adjacent lane would be dazzled even if the two lanes crossed by one Median strips are separated. In addition, such a headlight would illuminate the driver the vehicle in front of you in your lane via the rear-view mirror.

To remedy this has already been suggested to the headlights with asymmetrical low beam (continuously horizontal Cut-off line) to switch on a second headlight, one that runs vertically or almost vertically Has a light-dark boundary or an angularly bent light-dark boundary, the kink point of which is in is roughly in the middle of the horizontally running cut-off line of the other headlight, but a little above. This means that there is a further on the right half of your own lane Reaching low beam achieved, but the way in which this light is generated, is not favorable because the number of headlights doubles. In addition, a pair of headlights must be very precisely aligned be set.

The object of the invention is now to provide a low beam headlamp while circumventing the disadvantages listed above to create whose light-dark border in the transition from the horizontally running part to the rising part has a vertically extending step. The amendment is intended to be opposite the known asymmetrical low beam headlights should be as low as possible. According to the invention this is achieved in that the step is created by lowering the horizontal section of the cut-off line and when this section of the cut-off line is lowered, light passes through the diffuser arranged optical means from the side with the horizontally extending portion to the side with the rising section of the cut-off line is deflected horizontally. The lowering of the horizontal Section of the light-dark boundary by moving spiral images under the ascending section has the advantage that no light is lost through shading, but this light is lost in addition to Illumination of the right roadside is used. This results in a preferred illumination the right edge of the road at a great distance from the vehicle. The headlight is like that set that the lowered, horizontal section of the cut-off line is that for the low beam occupies the prescribed position.

In an advantageous embodiment of the inventive concept, when lowering the horizontal running section of the cut-off line, the outer part is deflected vertically downwards. These Embodiment has the advantage that the immediately below the horizontally extending portion of the The light-dark border area is illuminated more intensely.

To further intensify the illumination of the right-hand side of the road, an appropriate Further development of the inventive concept light rays from the area of the apron lighting to the rising section of the cut-off line and raised vertically adjacent to the step.

The invention is explained with reference to the following drawing, namely shows

F i g. 1 the lens, where the viewing direction corresponds to the direction of travel,

F i g. 2 the figure of light as it is without the use of a diffuser on a perpendicular in front of the headlight displayed measuring screen appears while

F i g. 3 represents the course of the cut-off line, as it is with the use of the in F i g. 1 shown Diffuser is achieved.

F i g. 4 shows the course of the old and the course of the cut-off line on the road, as well as the course proposed by the invention.

The invention is described below with reference to a headlamp in which a parabolic reflector is used and the light source is in front of the focal point of the reflector. The lower reflector häjfie is covered up to a sector of about 15 ° with respect to the light source. The diffuser 1 is divided into areas A, B, C, D, E, F, with the individual areas deflecting the light differently. In area A , prisms are arranged which bend the light, which is directed obliquely upwards, along the ascending section 2 of the light-dark boundary towards the center of the lane. This is shown in FIG. 2 clarified by the direction indication A '

The light that passes through the area B of the diffusing screen, which has prisms, is raised up to the rising section 2 of the light-dark boundary, the spiral images from step 3 of the light-dark boundary being applied. The direction of displacement of these helical images is denoted by B ' . Area B of the diffusion disk lies in the quadrant above area A and adjoins the vertical center plane of the diffusion disk.

The area C of the diffuser is provided with prisms which deflect the light horizontally and below the rising part of the cut-off line. The individual spiral images are advanced so far that they form stage 3. The direction of displacement '' of the individual spiral patterns is indicated by C '.

The area D of the lens is provided with prisms, which are superimposed with lenses at the same time. The prisms cause light to be deflected in direction D ", while the lines cause a scattering effect in direction E ' .

The area iT of the diffuser is with cylindrical lenses occupies which scatter the light passing through this area very strongly, so that no strong light Apron lighting is achieved. A strong apron • lighting would make the eye too close in front of the Adapt vehicle lying point.

In Figure 3 is the course of the invention Light-dark border, which results from the rising section 2 and the horizontally running section

4 with the intermediate step 3, shown. The position of the helical images deflected by the diffusion disk areas A to D is shown in FIG. 3 represented by the designation Λ "to D" The area F of the lens is for the above

ι · '<described low beam ineffective. Using a two-filament incandescent lamp, with the second filament in the focal point of the reflector, the vehicle headlight according to the invention can also be used as a high-beam headlight. In this case

»Α would be the area F of the lens optical means to optimize the high beam received.

In Fig. 4 is the right-hand lane of a two-lane road with one two-lane lane for each Direction of traffic shown The right edge of the lane

. '' of the right lane 6 is denoted by 5 and the left The lane edge of the left lane 8 is denoted by 7. The two lanes 6 and 8 forming the lane are indicated by the middle line 9 limited The oncoming traffic has the same lane.

-; · which adjoins the edge of the road 7 with the interposition of an intermediate strip. The designations in FIG. 4 on the right side of the road 5 give the dated Position of the vehicle from the measured distance. The course of the dashed line 10 indicates the location of the

π light-dark border of the previously known asymmetrical low beam. The dashed line 11 is the Course of the cut-off line according to the light distribution proposed in the present application.

For this 1 sheet of Zeiclinuinv.'n

Claims (3)

Patent claims: 1. Vehicle headlights with asymmetrical light distribution with the cut-off line between their horizontally running section facing the oncoming traffic and their uphill section facing away from the oncoming traffic has a step, thereby characterized in that the step (3) by lowering the horizontal section (4) the light-dark border arises and when lowering of this section (4) of the light-dark boundary light through arranged in the diffuser (1) optical means from the side of the horizontally extending section (4) to the side of the rising section (2) of the cut-off line (is deflected in the direction (? ',}. 2. Vehicle headlight according to claim 1, characterized in that when the horizontally extending section (4) of the light-dark boundary is lowered, the outer part is deflected vertically downwards (in the direction D '). 3. Vehicle headlight according to claim 1 or 2, characterized in that light rays from the area of the apron lighting up to the rising section (2) of the cut-off line and on the step (3) is raised vertically (in direction B ') will.