DE2261054A1 - VEHICLE HEADLIGHTS WITH ASYMMETRIC LIGHT DISTRIBUTION - Google Patents

Description

Westfälische Metall Industrie KG Lippstadt, December 1st, 1972

PAT / Bg / Sch H u e c k & Co No. 2501

Description for

Patent registration : "Vehicle headlights with asymmetrical light distribution"

The invention relates to a vehicle headlight with an asymmetrical light distribution, in which the cut-off line on the side facing the oncoming traffic horizontally and on the side facing away from the oncoming traffic rising runs.

In the case of the known headlights, the asymmetrical light distribution is used due to the asymmetrical design of the hood-like screen that partially covers the low-beam light source achieved, the part of the reflector not exposed to the light being limited by a solid angle of approximately 165 °. In order to intensify the light on the right side of the road (when driving on the right), the lens is in one on the side of the Providing oncoming traffic lying, sector-like area with prisms, the most of the above the horizontal center plane also obliquely upward light along the rising section of the light-conceited boundary to the middle of the lane bow down. In this way, a low beam lighting that does not disturb the oncoming traffic can be achieved which the right side of the road is preferably illuminated.

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However, it has been shown that the range of such a low beam for fast travel on roads with separate Railways are insufficient for each direction of traffic. A general shift of the cut-off line forwards. is not possible, however, because the oncoming traffic on the neighboring lane used by the oncoming traffic is then dazzled would if the two lanes were separated by a median. In addition, such a headlight lighting would dazzle the driver of a vehicle in front of you in your own lane via the rear-view mirror. task The invention is now to create a headlight, the light distribution of which, while circumventing the disadvantages mentioned above is designed so that only the right half of your own lane is illuminated further than before will. According to the invention, this is achieved in that the horizontally extending section of the light-dark boundary is lowered, so that a step arises to the rising section of the light-dark boundary and that Lowering of the horizontal section of the cut-off line is carried out by optical means arranged in the diffuser, which deflect at least part of the light falling below the rising section of the cut-off line horizontally. Lowering the horizontal section of the cut-off line by shifting spiral images below the rising ones Section has the great advantage that no light is lost through shading, but this light is lost in addition to the Illumination of the right roadside is used. This results in the addition of this light to the

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normal low beam a preferred illumination of the right Roadside at a distance of 100 and more meters. In front of the vehicle. The entire headlight is adjusted so that the lowered, horizontal section of the cut-off line assumes the position prescribed for the low beam.

In an advantageous embodiment of the inventive concept, when the horizontally extending section is lowered the cut-off line a part of the light under the rising running section of the light-dark border falling horizontally deflected, and the other preferably on the outer Part of the light lying on the edge of the light figure is deflected downwards. This has the advantage that once the light is deflected does not have to be so strong and on the other hand the immediately below the horizontally running section of the light-dark

The area lying on the border is illuminated more intensely.

To further intensify the illumination of the right-hand side of the road are in an expedient development of the inventive concept Spiral images from the area of the light figure, which provides the apron lighting, up to that rising running section of the cut-off line and at the step attached vertically.

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

Fig. 1 the lens, the direction of view of the Corresponds to the direction of travel,

Fig. 2 shows the light figure as it is without the use of a

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The diffusing screen appears on a measuring screen set up vertically in front of the headlight, while

FIG. 3 shows the course of the light-dark boundary, as it is with the use of the one shown in FIG. 1 Diffuser is achieved.

4 shows the course of the old and the course of the light-dark boundary proposed by the invention in the street.

The invention is described below using a headlight, in which a parabolic reflector is used and the light source is in front of the focal point of the reflector. In In this case, the light rays incident on the upper half of the reflector emerge at an angle to the roadway. The lower one The reflector half is covered up to a sector of about 15 ° with respect to the light source. The lens 1 is in the areas A, B, C, D, E, F divided, whereby the individual areas deflect the light differently. In the area A are arranged prisms, which the obliquely upward light along the ascending section 2 of the Bend the cut-off line towards the center of the lane. This is in 2 by the direction indication A 'clarified.

The light that passes through the area B of the lens, which has prisms, becomes up to that running section 2 of the cut-off line is raised adjacent, with the spiral images at step 3 of the cut-off line issue. The direction of displacement of these helical images

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is denoted by B *. Area B of the lens is located in the quadrant above area A and adjoins the vertical center plane of the diffusing screen.

The area C of the diffuser is provided with prisms, which the light horizontally and under the rising part of the Distract the cut-off line. The individual spiral images are shifted so far that they form stage 3. The direction of displacement of the individual spiral patterns is marked with C. specified.

The area D of the diffuser is provided with prisms, which are simultaneously superimposed with lenses. The prisms cause light to be deflected in direction D ^! , while the lenses cause a scattering effect in the direction E '.

The area E of the diffusing screen is covered with cylindrical lenses that greatly reduce the light passing through this area scatter heavily so that no strong apron lighting is achieved. A strong apron lighting would be the eye in one Adapt the point too close in front of the vehicle.

In Fig. 3 is the course of the light-dark boundary according to the invention, the rising section 2 and the .horizontal extending section 4 with the intermediate Stage 3 composed, shown. The position of the helical images deflected by the diffuser areas A to D. is represented in FIG. 3 by the designations A "to D".

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The area F of the lens is for that described above Low beam ineffective. When using a two-filament light bulb, wherein the second thread lies in the focal point of the reflector, the vehicle headlight according to the invention can can also be used as high beam headlights. In this case, the area F would be the lens optical means for optimizing the high beam received.

In Fig. 4 is the right lane of a two-lane road with a two-lane lane for each traffic direction shown. The right lane edge of the right lane 6 is denoted by 5 and the left edge of the lane is denoted by the left Lane 8 is denoted by 7. The two lanes 6 and 8 forming the roadway are delimited by the middle line 9. Oncoming traffic has the same lane, which is connected to the edge of the lane with the interposition of an intermediate lane 7 connects. The designations in Fig. 4 on the right side of the road 5 give the measured from the point of view of the vehicle Distance on. The course of the dashed line IC shows the position of the cut-off line of the previously known asymmetrical low beam. The dashed line 11 is the course of the cut-off line according to the present one Registration proposed light distribution.

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Claims (2)

- 7 claims Vehicle headlights with an asymmetrical light distribution in which the cut-off line on the side facing oncoming traffic horizontally and on the side facing away from oncoming traffic Side rising, characterized in that the horizontally extending Section (4) of the cut-off line is lowered, so that it rises Section (2) of the light-dark boundary a stage (3) arises, and that the lowering of the horizontal section (4) of the "light-dark border" by arranged in the diffuser optical means (C) takes place, the at least part of the light under the rising Deflect the section of the cut-off line falling horizontally. 2. Vehicle headlight according to claim 1, characterized in that when lowering the horizontally extending section (4) of the cut-off line, part of the light under the rising section (2) falling horizontally (in direction C) and the other part after below (in direction D ¹ ) is deflected. - 8th- 409 8 26/00 52 3 · Vehicle headlight according to claim 1 or 2, · characterized in that spiral images from the area of the apron lighting up to the ascending section (2) of the cut-off line and adjacent to the step (3) vertically (in direction B ^f ) be raised. 409826/0052