Light guide for optical module
By providing a plurality of sub-regions with different roughness in the second coupling output region of the light guide, the problem of discontinuous light distribution in the prior art is solved, and smooth transition and uniformity improvement of light distribution are achieved.
Patent Information
- Application Number
- CN202510407450.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-04-16
- Filing Date
- 2025-04-02
- Publication Date
- 2025-10-24
Smart Images
Figure CN120830818A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The invention relates to a light guide for a light module of a motor vehicle headlamp, wherein the light guide is provided for jointly contributing to a light distribution of the light module, wherein the light distribution has an intensity maximum region and a peripheral region directly adjacent to the intensity maximum region, wherein the light distribution has a gradual transition from the intensity maximum region to the peripheral region, wherein the light guide comprises:
[0002] - a light entry side provided for receiving light of at least one light source and coupling it into the light guide;
[0003] - a light exit side provided for coupling out light coupled into the light guide via the light entry side in a direction of a main illumination direction, wherein a light image can be generated which jointly contributes to the light distribution;
[0004] wherein the light exit side is formed by an associated coupling-out surface comprising at least one first coupling-out region and a second coupling-out region, wherein the first coupling-out region is smoothly configured and provided for jointly contributing in the generation of the intensity maximum region,
[0005] wherein the second coupling-out region has a roughness and is provided for jointly contributing in the generation of the peripheral region of the light distribution;
[0006] Further, the invention relates to a light module having at least one light guide according to the invention.
[0007] Further, the invention relates to a motor vehicle headlamp having at least one light module according to the invention and / or a light guide according to the invention. BACKGROUND
[0008] The light distribution of prior art light guides usually has an intensity maximum region and a peripheral region adjacent to the intensity maximum region, which peripheral region should have no sharp boundaries to the outside, i.e. should have a continuous change. In order to achieve this, in the prior art the second coupling-out region only has a uniform roughness, which however leads to a jump-like transition of the intensity maximum region to the peripheral region, which is not desirable. SUMMARY
[0009] It is therefore an object of the invention to provide an improved light guide.
[0010] This object is achieved in that the second coupling-out region is formed by at least two sub-regions having different roughnesses from one another according to VDI 3400:1975-06, wherein the sub-regions are arranged such that the roughness increases from the first coupling-out region, wherein the sub-region having the lower roughness is directly adjacent to the first coupling-out region, so that a gradual transition from the region of maximum intensity to the peripheral region can be produced in the light distribution.
[0011] It should be noted here again that the first coupling-out region and the second coupling-out region are sections of the coupling-out surface and thus also surfaces. Here, the first coupling-out region is a smooth surface without roughness or grain compared to the second coupling-out region.
[0012] It should also be noted that the surface structure according to VDI 3400 is not a planar or concave or convex strip- or block-like arrangement. In the sense of the application, the surface structure or roughness according to VDI 3400 is for example a grain, which can be produced for example by the electro-erosion method EDM (electrical discharge machining). It can be provided that the light distribution is a main beam distribution.
[0013] It can be provided that the light distribution is a low beam distribution, wherein the peripheral region is a front zone of the low beam distribution.
[0014] It can be provided that the second coupling-out region has at least three sub-regions, each having a different roughness, wherein the sub-regions are arranged such that the roughness increases from the first coupling-out surface.
[0015] It can be provided that the second coupling-out region has exactly three sub-regions having different roughnesses, wherein the sub-regions are arranged such that the roughness increases from the first coupling-out surface.
[0016] It can be provided that the sub-regions have a roughness according to VDI 12, VDI 22, VDI 30.
[0017] It can be provided that the roughness within the sub-regions of the second coupling-out surface is uniform.
[0018] It can be provided that the roughness within the sub-regions of the second coupling-out surface is non-uniform.
[0019] It can be provided here that the roughness of the sub-regions has a gradual continuous change, preferably a linear change, respectively, wherein the change develops from the first coupling-out region towards the edge of the outermost sub-region of the second coupling-out surface. The linear change is designed here such that the transition between the sub-regions of the second coupling-out region that are adjacent to one another is also designed continuously.
[0020] It can be provided that the sub-regions of the second coupling-out region are configured in the form of elliptical ring segments.
[0021] Furthermore, the object is achieved by a light module, wherein the light module comprises at least one light guide according to the invention, wherein the light module comprises at least one light source and at least one projection optical element for generating a light distribution in front of the light module, wherein a light image that can be generated by the light guide can be projected in front of the light module by the projection optical element.
[0022] It may be provided that the at least one light source is designed as an LED.
[0023] Furthermore, the object is achieved by a motor vehicle headlight having at least one light guide according to the invention and / or at least one light module according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In the following, the present invention will be explained in more detail with reference to the accompanying exemplary drawings, in which:
[0025] Figure 1 shows a perspective view of an exemplary light module having an exemplary light guide and projection optics;
[0026] Figure 2 Show Figure 1 Side view of the example in;
[0027] Figure 3 Show Figure 1 A perspective view of a light guide in , wherein the light guide has a coupling-out surface having a first coupling-out region and a second coupling-out region;
[0028] Figure 4 A perspective view showing another example of a light guide;
[0029] Figure 5 A perspective view showing another example of a light guide;
[0030] Figure 6 A perspective view showing another exemplary light module having a light guide and projection optics; and
[0031] Figure 7 An exemplary light distribution that can be generated by an exemplary light module is shown, wherein the light distribution includes a region of maximum intensity and a peripheral region adjacent to the region.
[0032] Reference Signs List
[0033] Light distribution…10
[0034] Optical modules…20
[0035] Light source…30
[0036] Projection optics…40
[0037] region of maximum intensity 10a
[0038] peripheral region 10b
[0039] light guide 100
[0040] light entry side 200
[0041] light exit side 300
[0042] first coupling-out region 310
[0043] second coupling-out region 320
[0044] sub-regions 321, 322, 323 DETAILED DESCRIPTION
[0045] Figure 1 or Figure 2 An exemplary light module 20 or motor vehicle headlamp is shown, having a projection optical element 40 and an exemplary light guide 100 and a light source 30 configured as an LED, wherein the light guide 100 is arranged for jointly contributing to a light distribution 10 of the light module, wherein the light distribution 10 has a region of maximum intensity 10a and a peripheral region 10b directly adjacent to the region of maximum intensity 10a, wherein the light distribution 10 has a gradual transition from the region of maximum intensity 10a to the peripheral region 10b, as shown in Figure 7
[0046] The light guide 100 comprises a light entry side 200 arranged for receiving light of the at least one light source 30 and coupling it into the light guide 100.
[0047] Further, the light guide 100 comprises a light exit side 300 arranged for coupling out light coupled into the light guide 100 via the light entry side 200 along a main radiation direction X, wherein a light image jointly contributing to the light distribution 10 can be generated.
[0048] The light exit side 300 is formed by an associated coupling-out surface formed by a first coupling-out region and a second coupling-out region 310, 320, wherein the first coupling-out region 310 is smoothly configured and arranged for jointly contributing to the region of maximum intensity 10a of the light distribution 10,
[0049] The second coupling-out region 320 has a roughness and is arranged for jointly contributing to the peripheral region 10b of the light distribution 10. In Figure 1 the example shown (in Figure 3 ), the second coupling-out region 320 is formed by three subregions 321 , 322 , 323 , which have different roughnesses according to VDI 3400:1975-06.
[0050] The sub-regions 321, 322, 323 are arranged such that the roughness increases starting from the first coupling-out region 320, wherein the sub-region 321 with the lower roughness is directly adjacent to the first coupling-out region 310, wherein the sub-regions 321, 322, 323 are arranged such that the roughness increases starting from the first coupling-out surface 310, so that a gradual transition from the maximum intensity region 10a to the peripheral region 10b can be produced in the light distribution 10.
[0051] The light distribution 10 may be a high-beam distribution or a low-beam distribution, wherein the peripheral area 10 b is a front zone of the low-beam distribution.
[0052] exist Figure 3 In the example shown, the sub-regions 321 , 322 , 323 have a roughness of VDI 12 , VDI 22 , VDI 30 .
[0053] In another example of the light guide 100, Figure 4 As shown, the subregions 321 , 322 , 323 of the second coupling-out region 320 are designed in the form of elliptical rings.
[0054] In another example of the light guide 100, Figure 5 As shown, the second coupling-out region 320 includes a plurality of sub-regions, which are arranged in rows and columns. Starting from the first coupling-out region, the roughness of each sub-region gradually increases.
[0055] The roughness of the sub-regions 321, 322, 323 can each have a gradual, continuous change, wherein the change progresses from the first coupling-out region 310 towards the edge of the outermost sub-region of the second coupling-out surface 320 - this can be for Figures 1 to 5 The embodiment shown in provides.
[0056] Figure 6 Another example of a light guide 100 is shown, in which a second coupling-out region 320 is arranged above and below the first coupling-out region 310, wherein the above description regarding the roughness of the subregions 321, 322, 323 of the second coupling-out region 320 also applies. The roughness of the subregions 321, 322, 323 above and / or below the first coupling-out region 310 can each have a gradual, continuous variation, wherein the variation progresses starting from the first coupling-out region 310 in the direction of the upper edge and the lower edge of the outermost subregion of the second coupling-out surface 320.
Claims
1. A light guide (100) for a light module of a motor vehicle headlamp, wherein The light guide (100) is provided for jointly contributing to a light distribution (10) of a light module, wherein the light distribution (10) has a region of maximum intensity (10a) and a peripheral region (10b) directly adjacent to the region of maximum intensity (10a), wherein the light distribution (10) has a gradual transition from the region of maximum intensity (10a) to the peripheral region (10b), wherein the light guide (100) comprises: - a light entry side (200) provided for receiving light of at least one light source and coupling it into the light guide (100); - a light exit side (300) provided for coupling out light coupled into the light guide (100) via the light entry side (200) in direction of a main illumination direction (X), wherein a light image jointly contributing to the light distribution (10) can be generated, wherein the light output side (300) is formed by an associated coupling-out surface comprising at least a first and a second coupling-out region (310, 320), wherein the first coupling-out region (310) is smoothly configured and provided for jointly contributing in generating the region of maximum intensity (10a), wherein the second coupling-out region (320) has a roughness and is provided for jointly contributing in generating the peripheral region (10b) of the light distribution (10), characterized in that the second coupling-out region (320) is formed by at least two sub-regions (321, 322) having different roughnesses according to VDI 3400:1975-06, wherein the sub-regions (321, 322) are arranged such that the roughness increases from the first coupling-out region, wherein the one sub-region (321, 322) having the lower roughness is directly adjacent to the first coupling-out region (310), such that a gradual transition from the region of maximum intensity (10a) to the peripheral region (10b) in the light distribution (10) can be generated.
2. The light guide of claim 1, wherein, The light distribution (10) is a high beam distribution.
3. The light distribution of claim 1, wherein, The light distribution (10) is a low beam distribution, wherein the peripheral region (10b) is a front zone of a low beam distribution.
4. The light guide according to any one of the preceding claims, wherein, The second coupling-out region (320) has at least three sub-regions (321, 322, 323), preferably exactly three sub-regions, which each have a different roughness, wherein the sub-regions (321, 322, 323) are arranged such that the roughness increases from the first coupling-out surface (310).
5. The light guide of claim 4, wherein, The sub-regions (321, 322, 323) have a roughness of VDI 12, VDI 22, VDI 30.
6. A light guide according to any one of the preceding claims, wherein, The roughness within the sub-regions (321, 322, 323) of the second coupling-out surface (320) is uniform.
7. The light guide of any one of claims 1 to 5, wherein, The roughness within the sub-regions (321, 322, 323) of the second coupling-out surface (320) is non-uniform.
8. The light guide according to claim 7, wherein: The roughness of the sub-areas (321, 322, 323) has a progressive continuous variation, wherein the variation develops from the first coupling-out area (310) towards the edge of the outermost sub-area of the second coupling-out surface (320).
9. A light guide according to any one of the preceding claims, wherein, The sub-areas (321, 322, 323) of the second coupling-out area (320) are configured in the form of elliptical ring segments.
10. A light module (20) for a motor vehicle headlamp, 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 optical element (40) for producing a light distribution (10) in front of the light module (20), wherein a light image producible by the light guide (100) can be projected by the projection optical element (40) in front of the light module (20).
11. The optical module according to claim 10, wherein The at least one light source (30) is configured as an LED.
12. Motor vehicle headlamp having at least one light guide (100) according to one of claims 1 to 9 and / or at least one light module (20) according to claim 10 or 11.