Lighting device for a motor vehicle headlamp and motor vehicle headlamp
By setting a deflection structure in the lighting device of the motor vehicle headlight, the light is controlled to form a signal light beam in the main body, the problem of diffuse light is solved and efficient signal light distribution control is achieved.
Patent Information
- Application Number
- CN202411686212.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-23
- Filing Date
- 2024-11-22
- Publication Date
- 2025-05-23
AI Technical Summary
When the lighting device of the existing motor vehicle headlights generates signal light distribution, it is difficult to control the light, which often leads to diffuse light and causes undesirable optical effects.
By providing a first deflection structure in the light coupling element, the light emitted by the light source is completely reflected and pointed to the second deflection structure. The second deflection structure deflects the light to the lower boundary surface of the light shielding device, thereby forming a signal light beam, preventing light from being emitted directly, and controlling the formation in the projection device.
The signal light distribution is controlled within the lighting device, avoiding diffuse light, ensuring the desired result of the optical effect, and not affecting the front area light distribution or low beam distribution.
Smart Images
Figure CN120027384A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a lighting device for a motor vehicle headlamp, which is used to generate a light distribution with a light-dark boundary, wherein the lighting device comprises:
[0002] A light-transmitting body,
[0003] at least one light coupling element,
[0004] a light source at least associated with the at least one light coupling-in element, wherein the at least one light coupling-in element is configured to couple light emitted by the at least one light source into the light-permeable body, and
[0005] · Projection device, wherein
[0006] The light coupling-in element is designed to couple at least a portion of the light emitted by the at least one light source into a light-permeable body in such a way that it propagates (fortpflanzt, sometimes referred to as travel) in the light-permeable body as a first light beam essentially in a light propagation direction toward a projection device, and wherein the light-permeable body has a shading device (Blendenvorrichtung) with a shading edge (Blendenkante), wherein the shading edge is arranged between the light coupling-in element and the projection device as viewed in the light propagation direction, and wherein the first light beam is modified (modifiziert, sometimes referred to as changed) by the shading edge into a second light beam, which is imaged by the projection device as a light distribution with a light-dark boundary, wherein the light-dark boundary, in particular the shape of the light-dark boundary, is formed by the shading edge, and wherein the shading edge is formed by a first lower boundary surface and a second lower boundary surface of the light-permeable body in such a way that these lower boundary surfaces converge in a common edge, namely the shading edge.
[0007] Furthermore, the invention relates to a motor vehicle headlight having at least one such lighting device. Background Art
[0008] Such lighting devices are known from the prior art in which, by modifying the light-permeable body, the light coupling element or the projection device, a signal light distribution can also be generated by means of the at least one light source in addition to the front light distribution or the low beam light distribution.
[0009] These modifications are usually designed in such a way that that portion of the light emitted by the light source which, without modification, either remains useless or contributes to the front light distribution or the low beam distribution and is used to produce the signal light distribution, emerges from the light-permeable body and is then imaged by a projection device (directly or after re-entering the light-permeable body) as a signal light distribution.
[0010] However, it has been found that the light emerging from a light-permeable body can be difficult to control and often results in diffuse light, which can lead to undesired optical effects. Summary of the invention
[0011] The object of the present invention is to provide a lighting device with which, in addition to a front light distribution or a low-beam light distribution, a signal light distribution can be additionally generated and in which the above-mentioned disadvantages do not occur.
[0012] This object is achieved using the lighting device mentioned at the beginning in the following manner, namely, according to the present invention, the light coupling element has a first deflection structure, which is constructed in such a way that light from at least one light source entering the light coupling element and incident on the deflection structure is totally reflected in such a way that the totally reflected light is directed to the second deflection structure, wherein the second deflection structure is arranged at an upper boundary surface of the light-guiding body opposite to the lower boundary surface, and wherein the second deflection structure is constructed in such a way that the light incident on the second deflection structure is deflected as a fourth light beam onto a first surface area of a first lower boundary surface of a shading device, which is arranged behind the second boundary surface of the shading device as viewed in the light propagation direction, and wherein the surface area deflects the light incident thereon as a fifth light beam into an area of a projection device, which images the light of the fifth light beam as a signal light beam into an area of the light distribution located above the light-dark boundary as an additional light distribution, for example as a signal light distribution.
[0013] Compared to the solutions of the prior art, in which the light path is generated outside the body of the light guide, the present invention implements the light path only inside the body of the light guide for generating signal light, thereby avoiding the problems of the prior art described, such as uncontrollable diffuse light, which, for example, contributes to excessive light in the area of the HV line.
[0014] The signal light distribution can be controlled in a simple manner without negatively affecting the front light distribution or the low beam light distribution.
[0015] In addition, the use of three total reflection areas (which implement the optical path of the light rays that generate the signal light) allows the three areas to be coordinated with each other, for example in terms of their spacing, size, shape, inclination, etc., so that the light distribution of the generated signal light is optimally matched to the desired requirements.
[0016] Advantageous embodiments of the invention are described in the exemplary embodiments.
[0017] It can be provided that the first deflector structure comprises a deflector surface or is designed in the form of a deflector surface, wherein, for example, the deflector surface is designed as a plane surface or as a concavely curved surface.
[0018] The concave curvature can be used, for example, to generate parallel beams of rays which strike the second deflection structure at the upper boundary surface in a uniformly distributed manner, thereby making it possible to achieve a better control of the intensity.
[0019] Furthermore, it can be provided that the second deflecting structure is designed as a surface, in particular as a plane.
[0020] This allows, for example, a simple design, since only the surface inclination has to be designed, and the light pre-shaping and the amount of light are ensured by the first deflection structure.
[0021] It can be provided that the first surface area of the first lower surface forms a straight section curve in a vertical section.
[0022] Furthermore, it can be provided that the first surface area of the first lower surface forms a curved section curve, in particular a convex section curve, in horizontal section.
[0023] Preferably, the convex profile curve follows the Petzval surface or the focusing surface of the projection device.
[0024] Here, the horizontal section curve is obtained by cutting the corresponding surface with a horizontal plane, and the vertical section curve is obtained by cutting the corresponding surface with a vertical plane, which extend parallel to the optical axis of the lighting device or projection device or include the optical axis.
[0025] It is preferably provided that the first surface region is a boundary surface of a recess in the first lower boundary surface.
[0026] Below the first surface area, the third surface area of the first boundary surface is connected to the first surface area. By forming the recess, the second surface area is present in such a way that no light reaches the second surface area from the second deflection structure. Since only one surface area that reflects light in the direction of the projection device is used, it is easier to control the generation of the signal light distribution.
[0027] Furthermore, it can advantageously be provided that the first surface area is spaced apart from the second boundary surface and that a further second surface area of the first boundary surface is arranged between the first surface area and the second boundary surface, which second surface area connects the first surface area to the second boundary surface.
[0028] Furthermore, in this context it can be provided that the second surface area is arranged and designed in such a way that no light from the second deflecting structure reaches the second surface area.
[0029] By means of the second surface area, which forms a stripe between the first surface area and the second boundary surface, for example, a dark stripe can be realized in the light pattern between the light-dark boundary of the front light distribution or the low beam light distribution and the lower boundary of the signal light distribution.
[0030] Furthermore, it can be provided that the second deflecting structure is formed by a recess in the upper boundary surface.
[0031] The recess is formed by a preferably planar surface and, if appropriate, by a further boundary surface or surfaces which face away from the light source and on which generally no light is incident or which have no function in terms of optical technology.
[0032] Furthermore, it can be provided that the blocking edge is located or is located essentially in the Petzval surface or the focusing surface of the projection device.
[0033] Finally, it can advantageously be provided that the at least one light coupling-in element, the light-permeable body and the projection device are formed in one piece from a light-permeable material and jointly form the body.
[0034] The light distribution with the light-dark boundary is preferably a front light distribution or a low-beam light distribution. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] The present invention is further described below with reference to the accompanying drawings.
[0036] Figure 1 A lighting device for a motor vehicle headlamp according to the prior art is shown in a perspective view from an oblique rear side.
[0037] Figure 1a The vertical section and the exemplary ray paths of the light rays emitted by the light source are shown. Figure 1 lighting devices,
[0038] Figure 2 The lighting device according to the present invention is shown in a side view,
[0039] Figure 2a The top view shows the Figure 2 lighting devices,
[0040] Figure 2b The perspective view from above shows the Figure 2 lighting devices,
[0041] Figure 2c The perspective view from below shows the Figure 2 lighting devices,
[0042] Figure 3 Shown according to Figure 2a The plane BB passes through the cross section of the lighting device, with a schematic representation of the direction of the rays,
[0043] Figure 3a A schematic representation of a further ray path from Figure 3 The cross section,
[0044] Figure 3bshows a vertical section in the area of the shading device,
[0045] Figure 4 Shown from Figure 2 A perspective view of an illumination device in the region of a light coupling-in element having a first deflection structure,
[0046] Figure 4a Shown from Figure 2 A perspective view of the lighting device in the region of the second deflection structure,
[0047] Figure 4b shows a perspective view of the entire lighting device,
[0048] Figure 4c Shown from Figure 2 A perspective view of a lighting device, with the focus on the shading device,
[0049] Figure 5 Schematically showing the relevant points of the front zone light distribution and the signal light distribution, and
[0050] Figure 6 A simulation of a low beam light distribution and a signal light distribution generated by the lighting device according to the present invention is shown. DETAILED DESCRIPTION
[0051] Figure 1 and Figure 1a First, a lighting device 1 for a motor vehicle headlamp according to the prior art is shown, which is used to generate a light distribution LV with a light-dark boundary HDG. Such a light distribution is, for example, a front light distribution or a low beam light distribution.
[0052] The present invention is based on such an illumination device 1 known from the prior art, and therefore identical technical features of the illumination device according to the prior art and the illumination device according to the present invention are denoted by the same reference numerals.
[0053] The lighting device 1 comprises a light-permeable body 100, light coupling elements 101 and a light source 10 associated with at least one light coupling element 101. Light emitted by the light source 10 is coupled into the light-permeable body 100 by the light coupling element 101 and travels in the direction of a projection device 200 of the lighting device 1.
[0054] The light source 10 is, for example, one or more LEDs, or in other words, the light source 10 includes one or more LEDs.
[0055] The projection device 200 is, for example, located opposite to the light coupling element 101 .
[0056] The light coupling element 101 is designed to couple at least a portion of the light emitted by the light source 10 into the light-permeable body 100 in such a way that it travels therein as a first light beam S1 to the projection device 200 .
[0057] The light-permeable body 100 has a light-blocking device 103 with a light-blocking edge 104 , wherein the light-blocking edge 104 is arranged between the light coupling element 101 and the projection device 200 as viewed in the light propagation direction X1 .
[0058] The first light beam S1 is modified by the light shielding edge 104 into a second light beam S2, which is imaged by the projection device 200 into a light distribution LV having a light-dark boundary HDG. The light-dark boundary HDG, in particular the shape of the light-dark boundary HDG, is determined by the light shielding edge 104.
[0059] The rays of the light beam S2 are modified by the projection device 200 to form a light beam S2 ′.
[0060] The light blocking edge 104 is formed by a first lower boundary surface 105 and a second lower boundary surface 106 of the light-permeable body 100 , which are located opposite the upper boundary surface 107 , in that the lower boundary surfaces 105 , 106 converge in a common edge, the light blocking edge 104 .
[0061] The blocking edge 104 is located or substantially located in the Petzval surface or the focusing surface of the projection device 200 .
[0062] Preferably, the light coupling element 101 shapes the light emitted by the light source and coupled into the light coupling element into a first light beam, wherein the light beam is preferably directed to an area, in particular to an area above a shading edge, preferably an area immediately above the shading edge.
[0063] In particular, in the lighting device according to the present invention, Figure 1 Different from the schematic diagram, it can be arranged that the shading edge is curved in the horizontal direction, in particular concavely curved, and the shading edge preferably follows the focal line of the projection device, wherein the shading edge is preferably located in the Petzval surface of the projection device, or approximately in the Petzval surface of the projection device.
[0064] Regarding the expression “the shielding edge is located in the Petzval surface”, it should be pointed out that it is precisely the following relationship: the projection device has a focus F200 located on the optical axis X of the projection device 200. The Petzval surface or focal plane contains the focus F200, and similarly, the focal line extends through the focus and is located in the Petzval surface.
[0065] In principle, whether this involves Figure 1The straight shielding edge shown is also a curved edge (e.g., as described above), and the shielding edge 104 is now usually not located exactly in the Petzval surface or in the focus F200, but is located above the focus 200 at a (smaller) distance. Typically, the light-dark boundary HDG drops slightly below the horizontal 0°-0° line, or below the horizontal line, in the light image, usually 0.573° lower. In order to achieve this in the light image, the shielding edge 104 is slightly located in the vertical direction, in most cases in practice, a few tenths of a millimeter above the optical axis X of the projection device 200, or above the focus F200.
[0066] It is preferably provided here that the light coupling-in element 101 , the light-transmissive body 100 and the projection device 200 are formed integrally from a light-transmissive material and jointly form the body 1000 .
[0067] Starting from such a lighting device 1, as in Figure 2 , Figure 2a-2c , Figure 3 , Figure 3a , Figure 3b as well as Figure 4 , Figure 4a-4c As shown in detail in FIG. 1 , in the lighting device 1 according to the present invention, the light coupling element 101 has a first deflection structure 101a, which is configured such that the light of the light source 10 (which enters the light coupling element 101 and impinges on the deflection structure 101a) is totally reflected such that the totally reflected light S3 is directed to the second deflection structure 107a. The second deflection structure 107a is arranged at the upper boundary surface 107 of the light-guiding body 100, which is opposite to the lower boundary surfaces 105, 106.
[0068] Preferably, the light coupling element 101, the light-conducting body 100 and the projection device 200 form a continuous, one-piece body 1000. The transparent, light-permeable material has a refractive index greater than that of air, from which the individual elements can be formed, or in the case of a one-piece body 1000, the body 1000 can be made. The material includes, for example, PMMA (polymethyl methacrylate) or PC (polycarbonate) and is particularly preferably formed from them. However, the body can also be made of a glass material, in particular an inorganic glass material.
[0069] Figure 3 Here again with Figure 1a Similarly, the ray course is shown, that is, the ray course of the light rays that form the light distribution with light-dark boundaries. Figure 3a As shown, according to the present invention, a portion of the light emitted from the light source 10 and entering the light coupling element 101 is now used to form the signal light distribution SV.
[0070] The second deflection structure 107a is designed such that the light S3 impinging thereon impinges on a first surface region 105a of the first lower boundary surface 105. The first lower boundary surface 105 is the boundary surface arranged behind the second boundary surface 106 or the light blocking edge 104 as viewed in the light propagation direction.
[0071] The second deflection structure 107a deflects the incident light S3 as a fourth light beam S4 (or in other words, the incident light S3 is totally reflected at the deflection structure 107a).
[0072] The surface area 105a deflects the light incident thereon as the fifth light beam S5 into the area 200a of the projection device 200, specifically, into the area 200a at the light exit surface 201 of the projection device which acts as a refracting light. The area 200a images the light of the fifth light beam S5 as a signal light beam S6 into the area B of the light distribution located above the light-dark boundary HDG, which serves as an auxiliary light distribution, i.e., as a signal light distribution SV.
[0073] As shown, the first deflector structure 101 a is preferably designed in the form of a deflector surface, wherein the deflector surface is, for example, a flat surface or, as shown, preferably a concavely curved surface.
[0074] The concave curvature can be used, for example, to generate a parallel beam of rays which are incident on the second deflection structure 107 a at the upper boundary surface 107 in a uniformly distributed manner, thereby enabling better control of the intensity.
[0075] The second deflection structure 101a is followed by a region 101b, which is optically inactive, in the transition to the light-guiding body 100. Preferably, the region 101b is tilted relative to the deflection structure 101a so that the light S3 deflected by the first deflection structure 101a, in particular totally reflected, can travel unhindered in the direction of the second deflection structure 107a.
[0076] The second deflector structure 107a is preferably designed as a surface, in particular as a plane.
[0077] For example, the second deflection structure 107a is formed by a recess 117 in the upper boundary surface 107. The recess 117 is formed by the preferably planar surface 107a and, if necessary, by a further boundary surface or a plurality of further boundary surfaces which face away from the light source 10 and on which generally no light is incident or which have no optical function.
[0078] As especially Figure 4cAs can be clearly seen in , the first surface region 105 a of the first lower surface 105 is preferably designed in such a way that in a vertical section through the light-conducting body 100 a straight profile curve 105 a ′ is produced in the region of the lower surface 105 .
[0079] Furthermore, it can be provided that the first surface area 105a of the first lower surface 105 forms a curved profile curve, in particular a convex profile curve, in a horizontal section. The convex profile curve preferably follows the Petzval surface or the focusing surface of the projection device.
[0080] Here, the horizontal section curve is obtained by cutting the corresponding surface with a horizontal plane, and the vertical section curve is obtained by cutting the corresponding surface with a vertical plane, which extend parallel to the optical axis of the lighting device or projection device or include the optical axis.
[0081] The first surface area 105a forms the boundary surface of the recess 115 in the first lower boundary surface 105. Below the first surface area 105a, the third surface area 105c of the first boundary surface 105 is connected to the first surface area. By forming the recess 115, the second surface area 105c is present in such a way that no light reaches the second surface area 105c from the second deflection structure 107a. By using only one surface area 105a that reflects light in the direction of the projection device, it is easier to control the generation of the signal light light distribution.
[0082] Furthermore, it can be advantageously provided that the first surface region 105a is spaced apart from the second boundary surface 106 and that a further second surface region 105b of the first boundary surface 105 is arranged between the first surface region 105a and the second boundary surface 106, the second surface region connecting the first surface region 105a to the second boundary surface 106. In this regard, it is advantageous if the second surface region 105b is arranged and designed in such a way that no light from the second deflection structure 107a reaches the second surface region 105b.
[0083] By means of the second surface area 105b forming a stripe between the first surface area 105a and the second boundary surface 106, a dark stripe BAN can be realized in the light pattern between the light-dark boundary of the front beam distribution or the low beam distribution and the lower boundary of the signal light distribution.
[0084] Figure 5 A light distribution LV is shown in the form of a schematic front light distribution with a light-dark boundary HDG, such as can be used, for example, according to Figure 1 However, it can also be produced using the lighting device 1 according to the present invention. Figure 5 Also shown is a region B in which the signal light distribution SV is to be generated, and the associated measuring points for which defined illumination intensity values must be observed (in this case in accordance with the corresponding ECE regulations).
[0085] Figure 6 A light distribution SV in the form of a low beam distribution with a light-dark boundary HDG is shown, and in addition a signal light distribution SV is shown. As can be seen, a dark band or stripe BAN is present between the light-dark boundary HDG and the lower boundary of the signal light distribution SV, which can be - as described above, in particular according to Figure 4c As described—this is achieved by the presence of the second surface area 105 b .
Claims
1. A lighting device (1) for a motor vehicle headlamp, the lighting device being used to generate a light distribution (LV) with a light-dark boundary (HDG), wherein: The lighting device comprises: a light-transmissive body (100), at least one light coupling element (101), a light source (10) at least associated with the at least one light coupling-in element (101), wherein the at least one light coupling-in element (101) is configured to couple light emitted by the at least one light source (10) into the light-permeable body (100), and A projection device (200), wherein The light coupling element (101) is configured to couple at least a portion of the light emitted by the at least one light source (10) into the light-permeable body (100) in such a way that at least a portion of the light propagates in the light-permeable body (100) as a first light beam (S1) substantially in a light propagation direction toward the projection device (200), and wherein The light-permeable body (100) has a shading device (103) with a shading edge (104), wherein the shading edge (104) is arranged between the light coupling element (101) and the projection device (200) as viewed in the light propagation direction, and wherein The light-shielding edge (104) is formed by a first lower boundary surface (105) and a second lower boundary surface (106) of the light-permeable body (100), in that the lower boundary surfaces (105, 106) converge in a common edge, the light-shielding edge (104). It is characterized in that The light coupling element (101) has a first deflection structure (101a) which is designed such that light of the at least one light source (10) that enters the light coupling element (101) and impinges on the deflection structure (101a) is totally reflected such that the totally reflected light (S3) is directed toward a second deflection structure (107a), wherein The second deflection structure (107a) is arranged at an upper boundary surface (107) of the light-guiding body (100) opposite to the lower boundary surfaces (105, 106), and wherein The second deflection structure (107a) is constructed so that the light impinging on the second deflection structure is deflected as a fourth light beam (S4) onto a first surface area (105a) of a first lower boundary surface (105) of the shading device (103), wherein the first lower boundary surface (105) is arranged behind a second boundary surface (106) of the shading device (103) as viewed in the light propagation direction (X1), and wherein The surface area (105a) deflects the light impinging thereon as a fifth light beam (S5) into an area (200a) of the projection device (200), and the area images the light of the fifth light beam (S5) as a signal light beam (S6) into an area (B) of the light distribution located above the light-dark boundary as an additional light distribution, for example as a signal light distribution (SV).
2. The lighting device according to claim 1, wherein: The first deflector structure (101a) comprises a deflector surface or is configured in the form of a deflector surface, wherein, for example, the deflector surface is configured as a plane or as a concavely curved surface.
3. A lighting device according to any one of the preceding claims, wherein: The second deflecting structure (107a) is designed as a surface, in particular as a plane.
4. A lighting device according to any one of the preceding claims, wherein: The first surface area (105a) of the first lower surface (105) forms a straight section curve in a vertical section.
5. A lighting device according to any one of the preceding claims, wherein: The first surface area (105a) of the first lower surface (105) forms a curved profile curve, in particular a convex profile curve, in a horizontal section.
6. A lighting device according to any one of the preceding claims, wherein: The first surface region (105a) is a boundary surface of a recess (115) in the first lower boundary surface (105).
7. A lighting device according to any one of the preceding claims, wherein: The first surface area (105a) is spaced apart from the second boundary surface (106), and a further second surface area (105b) of the first boundary surface (105) is arranged between the first surface area (105a) and the second boundary surface (106), the second surface area connecting the first surface area (105a) and the second boundary surface (106).
8. The lighting device according to claim 7, wherein: The second surface area (105b) is arranged and designed in such a way that no light from the second deflection structure (107a) reaches the second surface area (105b).
9. A lighting device according to any one of the preceding claims, wherein: The second deflecting structure (107a) is formed by a recess (117) in the upper boundary surface (107).
10. A lighting device according to any one of the preceding claims, wherein: The light blocking edge (104) is located, or is substantially located, in the Petzval surface or the focusing surface of the projection device (200).
11. A lighting device according to any one of the preceding claims, wherein: The at least one light coupling-in element (101), the light-permeable body (100) and the projection device (200) are formed in one piece from a light-permeable material and together form a body (1000).
12. A lighting device according to any one of the preceding claims, wherein: The light distribution (LV) with the light-dark boundary (HDG) is a front light distribution or a low-beam light distribution.
13. A motor vehicle headlamp comprising at least one lighting device according to any one of claims 1 to 12.