Light guide for a light module

Abstract

Light guide element (100) for a light module of a motor vehicle headlight, comprising the following: - a light entry side (200) and a light exit side (300), wherein the light exit side (300) is formed from a continuous output coupling surface comprising at least a first and a second output coupling area (310, 320), wherein the first output coupling area (310) is smooth, wherein the second coupling area (320) has roughnesses and is set up, wherein the second coupling area (320) is formed from at least two sub-areas (321, 322) which have different roughnesses according to VDI 3400:1975-06, wherein the sub-areas (321, 322) are arranged such that the roughnesses increase starting from the first coupling area, wherein that sub-area (321, 322) with the lower roughness directly adjoins the first coupling area (310), so that a gradual transition in the light distribution (10) from the intensity maximum area (10a) to the peripheral area (10b) can be generated.

Description

[0001] The invention relates to a light guide body for a light module of a motor vehicle headlight, wherein the light guide body is designed to contribute to the generation of a light distribution of the light module, wherein the light distribution has a maximum intensity region and a peripheral region immediately adjacent to the maximum intensity region, wherein the light distribution has a gradual transition from the maximum intensity region to the peripheral region, wherein the light guide body comprises the following: - a light entry side which is designed to receive light from at least one light source and to couple it into the light guide body, - a light exit side, which is configured to couple out the light coupled into the light guide body via the light entry side in the direction of a main emission direction, whereby a light image can be generated which contributes to the generation of the light distribution, whereby the light exit side is formed from a continuous coupling-out surface, comprising at least a first and a second coupling-out region, whereby the first coupling-out region is smooth and is configured to contribute to the generation of the intensity maximum region, wherein the second coupling-out region has roughnesses and is configured to participate in the generation of the peripheral region of the light distribution.

[0002] Furthermore, the invention relates to a light module with at least one light guide body according to the invention.

[0003] Furthermore, the invention relates to a motor vehicle headlight with at least one light module according to the invention and / or a light guide body according to the invention.

[0004] Light distributions of prior art light guides typically have a maximum intensity region and a peripheral region adjacent to this region, which should not have any sharp boundaries toward the outside, i.e., should have a continuous profile. To achieve this, in the prior art, the second output region only has a homogeneous roughness, which, however, leads to a sudden transition from the maximum intensity region to the peripheral region, which is undesirable.

[0005] It is therefore an object of the invention to provide an improved light guide body.

[0006] This object is achieved in that the second coupling-out region is formed from at least two partial regions which have different roughnesses according to VDI 3400:1975-06, wherein the partial regions are arranged such that the roughnesses increase starting from the first coupling-out region, wherein the partial region with the lower roughness directly adjoins the first coupling-out region, so that a gradual transition in the light distribution from the intensity maximum region to the peripheral region can be generated.

[0007] It should be emphasized again at this point that the first and second coupling-out regions are sections of one of the coupling-out surfaces and are therefore also surfaces. The first coupling-out region is a smooth surface, free of roughness or grain, in contrast to the second coupling-out region.

[0008] Furthermore, it should be noted that a surface structure according to VDI 3400 is not a striped or block-like arrangement of flat surfaces or concave or convex curved surfaces. Surface structures or roughnesses according to VDI 3400, within the meaning of the invention, are, for example, graining, which can be produced using EDM (Electric Discharge Machined) methods, for example. The light distribution can be a high-beam distribution.

[0009] It can be provided that the light distribution is a low beam distribution, with the peripheral area being the front of the low beam distribution.

[0010] It can be provided that the second coupling-out region has at least three sub-regions, each with different roughnesses, wherein the sub-regions are arranged such that the roughnesses increase starting from the first coupling-out surface.

[0011] It can be provided that the second coupling-out region has exactly three sub-regions with different roughnesses, wherein the sub-regions are arranged such that the roughnesses increase starting from the first coupling-out surface.

[0012] It can be provided that the sub-areas have roughnesses of VDI 12, VDI 22, VDI 30.

[0013] It can be provided that the roughness is homogeneous within a partial area of ​​the second coupling-out surface.

[0014] It can be provided that the roughness is inhomogeneous within a partial area of ​​the second coupling-out surface.

[0015] In this case, it can be provided that the roughness of the sub-regions each have a gradual, continuous profile, preferably a linear profile, wherein the profile extends from the first coupling-out region toward an edge of the outermost sub-region of the second coupling-out surface. A linear profile is designed such that the transition between adjacent sub-regions of the second coupling-out region is also continuous.

[0016] It can be provided that the partial regions of the second coupling-out region are designed in the form of elliptical partial rings.

[0017] Furthermore, the object is achieved by a light module, wherein the light module comprises at least one light guide body according to the invention, wherein the light module comprises at least one light source and at least one projection optics for generating the light distribution in front of the light module, wherein the light image that can be generated by the light guide body can be projected by the projection optics in front of the light module.

[0018] It can be provided that the at least one light source is designed as an LED.

[0019] Furthermore, the object is achieved by a motor vehicle headlight with at least one light guide body according to the invention and / or at least one light module according to the invention. Character description

[0020] The invention is explained in more detail below with reference to exemplary drawings. Fig. 1 a perspective view of an exemplary light module with an exemplary light guide body and a projection optics; Fig. 2 a side view of the example from Fig. 1; Fig. 3 a perspective view of the light guide body from Fig. 1, wherein the light guide body has a coupling-out surface with a first and second coupling-out region; Fig. 4 is a perspective view of another example of a light guide body; Fig. 5 is a perspective view of another example of a light guide body; Fig. 6 a perspective view of another exemplary light module with a light guide body and a projection optics; and Fig. 7 an exemplary light distribution which can be generated by the exemplary light modules, wherein the light distribution has an intensity maximum area and a peripheral area adjoining this area.

[0021] Fig. 1 or Fig. 2 shows an exemplary light module 20 or a motor vehicle headlight with a projection optics 40 and an exemplary light guide body 100 as well as light sources 30, which are designed as LEDs, wherein the light guide body 100 is configured to contribute to the generation of a light distribution 10 of the light module, wherein the light distribution 10 has an intensity maximum region 10a and a peripheral region 10b immediately adjacent to the intensity maximum region 10a, wherein the light distribution 10 has a gradual transition from the intensity maximum region 10a to the peripheral region 10b, as in Fig. 7 can be seen.

[0022] The light guide body 100 comprises a light entry side 200, which is configured to receive light from at least one light source 30 and to couple it into the light guide body 100.

[0023] Furthermore, the light guide body 100 comprises a light exit side 300, which is configured to couple out the light coupled into the light guide body 100 via the light entry side 200 in the direction of a main emission direction X, wherein a light image can be generated that contributes to generating the light distribution 10.

[0024] The light exit side 300 is formed from a continuous coupling-out surface, which is formed from a first and a second coupling-out region 310, 320, wherein the first coupling-out region 310 is smooth and is designed to participate in the generation of the intensity maximum region 10a of the light distribution 10,

[0025] The second coupling-out region 320 has roughnesses and is configured to contribute to the generation of the peripheral region 10b of the light distribution 10. In the example shown, the second coupling-out region 320 is made of Fig. 1 (which in Fig. 3 is shown in detail) is formed from three sub-areas 321, 322, 323, which have different roughnesses according to VDI 3400:1975-06.

[0026] The partial regions 321, 322, 323 are arranged such that the roughness increases starting from the first coupling-out region 320, with the partial region 321 with the lower roughness directly adjoining the first coupling-out region 310. The partial regions 321, 322, 323 are arranged such that the roughness increases starting from the first coupling-out surface 310. Thus, a gradual transition in the light distribution 10 from the intensity maximum region 10a to the peripheral region 10b can be generated.

[0027] The light distribution 10 can be a high beam distribution or a low beam distribution, wherein the peripheral area 10b is the front of the low beam distribution.

[0028] In the example shown from Fig. 3, the sub-areas 321, 322, 323 have roughnesses of VDI 12, VDI 22, VDI 30.

[0029] In another example of a light guide body 100, as in Fig. 4, the partial regions 321, 322, 323 of the second coupling-out region 320 are formed in the form of elliptical rings.

[0030] In another example of a light guide body 100, as in Fig. As shown in Figure 5, the second coupling-out region 320 comprises several subregions arranged in rows and columns. Starting from the first coupling-out region, the roughness of the respective subregions gradually increases.

[0031] The roughness of the partial areas 321, 322, 323 can each have a gradual, continuous course, wherein the course runs from the first coupling-out area 310 in the direction of an edge of the outermost partial area of ​​the second coupling-out surface 320 - this can be done for the embodiments shown in Fig. 1 to Fig. 5 should be provided.

[0032] Fig.6 shows a further example of a light guide body 100, wherein the second coupling-out region 320 is arranged on a top and bottom side of the first coupling-out region 310. The above-mentioned statements regarding the roughness of the partial regions 321, 322, 323 of the second coupling-out region 320 also apply. The roughness of the partial regions 321, 322, 323 above and / or below the first coupling-out region 310 can each have a gradual, continuous profile, wherein the profile extends from the first coupling-out region 310 toward both the top and bottom edges of the outermost partial region of the second coupling-out surface 320. LIST OF REFERENCE SYMBOLS 10 Light distribution 20 light modules 30 light source 40 Projection optics 10a Intensity maximum range 10b Peripheral area 100 light guides 200 light entry side 300 light exit side 310 First decoupling area 320 Second decoupling area 321, 322, 323 sub-areas

Claims

[1] Light guide body (100) for a light module of a motor vehicle headlight, wherein the light guide body (100) is configured to contribute to generating a light distribution (10) of the light module, wherein the light distribution (10) has an intensity maximum region (10a) and a peripheral region (10b) immediately adjacent to the intensity maximum region (10a), wherein the light distribution (10) has a gradual transition from the intensity maximum region (10a) to the peripheral region (10b), wherein the light guide body (100) comprises the following: - a light entry side (200) which is configured to receive light from at least one light source and couple it into the light guide body (100), - a light exit side (300) which is configured to couple the light coupled into the light guide body (100) via the light entry side (200) in the direction of a main emission direction (X), wherein a light pattern can be generated which contributes to the generation of the light distribution (10), wherein the light exit side (300) is formed from a continuous output coupling surface comprising at least a first and a second output coupling area (310, 320), wherein the first output coupling area (310) is smooth and is configured to contribute to the generation of the intensity maximum area (10a), wherein the second coupling area (320) has roughness and is designed to contribute to the generation of the peripheral area (10b) of the light distribution (10), characterized by , that the second coupling area (320) is formed from at least two sub-areas (321, 322) which have different roughnesses according to VDI 3400:1975-06, wherein the sub-areas (321, 322) are arranged such that the roughnesses increase from the first coupling area, wherein the sub-area (321, 322) with the lower roughness is directly adjacent to the first coupling area (310), so that a gradual transition in the light distribution (10) from the intensity maximum area (10a) to the peripheral area (10b) can be generated. [2] Light guide body according to claim 1, wherein the light distribution (10) is a high beam distribution. [3] Light guide body according to claim 1, wherein the light distribution (10) is a low beam distribution, wherein the peripheral area (10b) is the area in front of the low beam distribution. [4] Light guide body according to one of the preceding claims, wherein the second coupling area (320) has at least three sub-areas (321, 322, 323), preferably exactly three sub-areas, each with different roughnesses, wherein the sub-areas (321, 322, 323) are arranged such that the roughnesses increase starting from the first coupling area (310). [5] Light guide body according to claim 4, wherein the sub-areas (321, 322, 323) have roughnesses of VDI 12, VDI 22, VDI 30. [6] Light guide body according to one of the preceding claims, wherein the roughness within a partial area (321, 322, 323) of the second coupling surface (320) is homogeneous. [7] Light guide body according to one of claims 1 to 5, wherein the roughness within a partial area (321, 322, 323) of the second output surface (320) is inhomogeneous. [8] Light guide body according to claim 7, wherein the roughness of the sub-areas (321, 322, 323) each have a gradual, continuous progression, the progression extending from the first coupling area (310) towards an edge of the outermost sub-area of ​​the second coupling surface (320). [9] Light guide body according to one of the preceding claims, wherein the sub-areas (321, 322, 323) of the second output coupling area (320) are formed in the form of elliptical sub-rings. [10] Light module (20) for a motor vehicle headlight, wherein the light module (20) comprises at least one light guide (100) according to one of the preceding claims, wherein the light module (20) comprises at least one light source (30) and at least one projection optic (40) for generating the light distribution (10) in front of the light module (20), wherein the light image that can be generated by the light guide (100) can be projected by the projection optic (40) in front of the light module (20). [11] Light module according to claim 10, wherein the at least one light source (30) is designed as an LED. [12] Motor vehicle headlights with at least one light guide element (100) according to one of claims 1 to 9 and / or at least one light module (20) according to claim 10 or 11.

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