Low-beam module

Abstract

The present disclosure relates to the technical field of vehicle lamps. Disclosed is a low-beam module. The low-beam module comprises a light source, a first optical structure, and a thick-walled light exit structure which are sequentially arranged in a first direction, the surface of the thick-walled light exit structure facing away from the first optical structure is a light exit surface, the thick-walled light exit structure has a first side surface and a second side surface which are arranged opposite to each other in a second direction, and the first direction is perpendicular to the second direction. A first groove extending in a third direction is formed on the second side surface of the thick-walled light exit structure, the third direction is perpendicular to the first direction and perpendicular to the second direction, the bottom width of the first groove is set to be less than the opening width of the first groove, and at least one of two side walls of the first groove comprises a plurality of arc-shaped surfaces arranged in the third direction, so that the bottom and the two side walls of the first groove form a light regulating structure. The light regulating structure is used to form illumination light of region III above a low-beam cut-off line, so that the design of the light exit surface of the thick-walled light exit structure is more flexible, thereby achieving good static appearance consistency.

Description

low beam module Technical Field

[0001] This disclosure relates to the field of automotive lighting technology, and more particularly to a low beam module.

[0002] Background of the Invention

[0003] We know that vehicle low beam headlights are for short-range illumination. To optimize lighting effects, ensure driving safety, and reduce interference with other road users, the illumination in zones I, II, and III of the low beam pattern must all meet requirements. Zone I covers the road surface 10m-25m in front of the vehicle, while Zone II covers the road surface 50m and further in front of the vehicle. The light patterns in Zones I and II are mainly composed of a combination of the low beam elbow cutoff line pattern and the low beam widening pattern. Zone III is the area above the low beam cutoff line. Although the illumination in Zone III is relatively weak, it is an anti-glare zone, mainly to avoid glare interference to other road users (such as pedestrians, cyclists, or drivers of oncoming vehicles). Therefore, the lighting design of low beam zone III is crucial for safe driving.

[0004] Currently, the optical structure that forms the III region illumination light above the near-light cutoff line is generally designed on the light-emitting surface of the optical element, which affects the appearance of the optical element. Summary of the Invention

[0005] To address the aforementioned technical issues, this disclosure provides a low beam module in which a dimming structure is designed on the side of the thick-walled light-emitting structure of the low beam module, rather than on the light-emitting surface. The dimming structure is used to generate Zone III illumination light above the low beam cutoff line, allowing for more freedom in the design of the light-emitting surface of the thick-walled light-emitting structure, resulting in good static appearance consistency and meeting different styling requirements.

[0006] To achieve the above objectives, the present disclosure provides the following technical solutions:

[0007] A low beam module includes a light source, a first optical structure, and a thick-walled light-emitting structure arranged sequentially along a first direction. The surface of the thick-walled light-emitting structure facing away from the first optical structure is a light-emitting surface. The side of the thick-walled light-emitting structure includes a first side and a second side arranged opposite to each other along a second direction. The first direction and the second direction are perpendicular to each other.

[0008] The second side is provided with a first groove extending along a third direction, which is perpendicular to the first direction and perpendicular to the second direction; the width of the bottom of the first groove along the first direction is less than the width of the opening of the first groove along the first direction; both sidewalls of the first groove are arc-shaped surfaces; the bottom of the first groove and the two sidewalls constitute a dimming structure; at least one of the two sidewalls of the first groove includes a plurality of sub-arc-shaped surfaces arranged along the third direction.

[0009] After the light emitted by the light source passes through the first optical structure, part of the light passes through the interior of the thick-walled light-emitting structure and then exits from the light-emitting surface, forming a near-beam elbow-shaped cutoff line light pattern and / or a near-beam broadening light pattern; another part of the light passes through the dimming structure and is dispersed or converged by multiple sub-arc surfaces along the third direction, and then exits from the light-emitting surface, forming the III-zone illumination light above the near-beam cutoff line.

[0010] Compared with existing technologies, the above technical solution has the following advantages:

[0011] The low beam module provided in this embodiment includes a light source, a first optical structure, and a thick-walled light-emitting structure arranged sequentially along a first direction. The surface of the thick-walled light-emitting structure facing away from the first optical structure is the light-emitting surface. The side surface of the thick-walled light-emitting structure includes a first side surface and a second side surface arranged opposite to each other along a second direction, with the first and second directions being perpendicular. A first groove extending along a third direction is provided on the second side surface of the thick-walled light-emitting structure. The third direction is perpendicular to both the first and second directions. The bottom width of the first groove along the first direction is smaller than the opening width of the first groove along the first direction. At least one of the two side walls of the first groove includes multiple arc-shaped surfaces arranged along the third direction. Thus, the bottom of the first groove and the two side walls constitute a dimming structure. After the light emitted by the light source passes through the first optical structure, part of the light passes through the interior of the thick-walled light-emitting structure and is then emitted from the light-emitting surface, forming a near beam elbow cutoff line light pattern and / or a near beam broadening light pattern. Another part of the light passes through the dimming structure and is dispersed or converged by the multiple arc-shaped surfaces along the third direction, and then emitted from the light-emitting surface, forming the III zone illumination light above the near beam cutoff line.

[0012] Therefore, the low beam module provided in this embodiment of the present disclosure designs a dimming structure on the side of its thick-walled light-emitting structure rather than on the light-emitting surface. The dimming structure forms the III-zone illumination light above the low beam cutoff line, which makes the design of the light-emitting surface of the thick-walled light-emitting structure more flexible, has good static appearance consistency, and can meet different styling requirements. Furthermore, the light incident on the side of the thick-walled light-emitting structure is usually stray light. By converting some of the stray light into the III-zone illumination light above the low beam cutoff line through the dimming structure located on the side of the thick-walled light-emitting structure, the optical efficiency of the low beam module can also be improved.

[0013] Brief description of the attached figures

[0014] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 is a side view of a low beam module provided in an embodiment of this disclosure;

[0016] Figure 2 is a partially enlarged schematic diagram of the second side of the thick-walled light-emitting structure in the low beam module provided in the embodiment of this disclosure;

[0017] Figure 3 is a partially enlarged schematic diagram of the second side of the low beam module provided in this embodiment, viewed from the inside of the thick-walled light-emitting structure.

[0018] Figure 4 is a schematic diagram of the light rays passing through the thick-walled light-emitting structure;

[0019] Figure 5 is a top view of the thickness light-emitting structure;

[0020] Figure 6 is a partially enlarged schematic diagram of the light guide tooth structure on the second side of the thick-walled light-emitting structure;

[0021] Figure 7 is a top-view perspective schematic diagram of a low beam module provided in an embodiment of this disclosure;

[0022] Figure 8 is a side view of the first total reflection surface structure and the thick-walled light-emitting structure in a low beam module provided in an embodiment of this disclosure.

[0023] Figure 9 is a bottom view of the overall structure of the first total reflection surface and the thick-walled light-emitting structure in a low beam module provided in an embodiment of this disclosure.

[0024] Figure 10 is a top-view perspective view of another low beam module provided in an embodiment of this disclosure;

[0025] Figure 11 is a side view of the second total reflection surface structure and the thick-walled light-emitting structure in another low beam module provided in this embodiment of the present disclosure.

[0026] Figure 12 is a bottom view of the overall structure of the second total reflection surface and the thick-walled light-emitting structure in a low beam module provided in an embodiment of this disclosure.

[0027] Figure 13 is a top-view perspective diagram of another low beam module provided in the embodiment of this disclosure;

[0028] Figure 14 is a side view schematic diagram of the main ray tracing of a low beam module provided in an embodiment of this disclosure;

[0029] Figure 15 is a side view schematic diagram of ray tracing near the cutoff line of a low beam module provided in an embodiment of this disclosure;

[0030] Figure 16 is a top view schematic diagram of ray tracing near the elbow-shaped cutoff line of a low beam module provided in an embodiment of this disclosure;

[0031] Figure 17 is a top view schematic diagram of the low beam broadening ray tracing of a low beam module provided in an embodiment of the present disclosure;

[0032] Figure 18 is a side view schematic diagram of the light tracing of the III zone illumination light above the low beam cutoff line provided in this embodiment of the low beam module.

[0033] Figure 19 is a side view schematic diagram of stray light tracing of a low beam module provided in an embodiment of the present disclosure;

[0034] Figure 20 is a diagram showing the lighting effect of a low beam elbow-shaped cutoff line light pattern formed by a low beam module according to an embodiment of this disclosure.

[0035] Figure 21 is a diagram showing the lighting effect of a low beam broadening beam pattern formed by a low beam module according to an embodiment of this disclosure;

[0036] Figure 22 is a diagram showing the lighting effect of a complete low beam pattern formed by the combination of the elbow-shaped cutoff line light pattern and the widened low beam light pattern of a low beam module provided in an embodiment of this disclosure.

[0037] Reference numerals: 100 - Light source; 200 - First optical structure; 300 - Thick-walled light-emitting structure; 310 - Light-emitting surface; 320 - First side surface; 330 - Second side surface; U1 - First groove; T1 - Light-adjusting structure; S1 - Sub-arc surface; T2 - Light guide tooth structure; T21 - First tooth surface; T22 - Second tooth surface; T23 - Virtual surface; 210 - First reflective focusing structure; 211 - First light-incident surface; 212 - First reflective bowl surface; 213 - First cutoff surface; 220 - First total reflection surface structure; 221 - First total reflection surface; 222 - Second total reflection surface; 230 - Second reflective focusing structure; 231 - Second incident light surface; 232 - Second reflective bowl surface; 233 - First cutoff surface; 240 - Second total reflection surface structure; 241 - Third total reflection surface; 242 - Second total reflection surface; F - First focal point; FF - First focal line; U2 - Second groove; T3 - Dimming structure.

[0038] Methods of implementing the present invention

[0039] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0040] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure. However, this disclosure may be implemented in other ways different from those described herein, and those skilled in the art may make similar extensions without departing from the spirit of this disclosure. Therefore, this disclosure is not limited to the specific embodiments disclosed below.

[0041] Secondly, this disclosure is described in detail with reference to the schematic diagrams. When detailing the embodiments of this disclosure, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to general proportions. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this disclosure. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0042] As described in the background section, the illumination design of the low beam zone III is crucial for safe driving. However, the optical structure that forms the zone III illumination light above the low beam cutoff line is generally designed on the light-emitting surface of the optical element, which affects the appearance of the optical element.

[0043] In view of the above, this disclosure provides a low beam module. Figure 1 shows a side view of a low beam module provided by this disclosure. As shown in Figure 1, the low beam module includes a light source 100, a first optical structure 200, and a thick-walled light-emitting structure 300 arranged sequentially along a first direction X. The thick-walled light-emitting structure 300 has a certain thickness along the first direction X. The surface of the thick-walled light-emitting structure 300 facing away from the first optical structure 200 is the light-emitting surface 310. The side surface of the thick-walled light-emitting structure 300 includes a first side surface 320 and a second side surface 330 arranged opposite to each other along a second direction Y. The first direction X and the second direction Y are perpendicular.

[0044] As shown in Figure 1, the second side 330 of the thick-walled light-emitting structure 300 is provided with a first groove U1 extending along the third direction Z. The third direction Z is perpendicular to the first direction X and perpendicular to the second direction Y. The first direction X, the second direction Y and the third direction Z form a three-dimensional coordinate system. The plane formed by the first direction X and the third direction Z is a horizontal plane, the second direction Y is the longitudinal direction, that is, the longitudinal direction of the near beam, and the third direction Z is the transverse direction of the near beam.

[0045] To better understand this disclosure, Figure 2 shows a partially enlarged schematic diagram of the second side 330 of the thick-walled light-emitting structure 300 in the low beam module provided in the embodiment of this disclosure. As shown in Figure 2, the width w1 of the bottom of the first groove U1 along the first direction X is smaller than the width w2 of the opening of the first groove U1 along the first direction X. Thus, the two side walls C1 and C2 of the first groove U1 are both arc-shaped surfaces, and the bottom of the first groove U1 and the two side walls constitute the dimming structure T1.

[0046] Figure 3 further shows a partially enlarged schematic diagram of the second side surface 330 viewed from the inside of the thick-walled light-emitting structure 300. As shown in Figure 3, at least one of the two side walls of the first groove U1 includes a plurality of sub-arc surfaces S1 arranged along the third direction Z, i.e., optical patterns arranged along the third direction Z. That is, the side wall C1 of the first groove U1 includes a plurality of sub-arc surfaces S1 arranged along the third direction Z, or the side wall C2 of the first groove U1 includes a plurality of sub-arc surfaces S1 arranged along the third direction Z, or both the side walls C1 and C2 of the first groove U1 include a plurality of sub-arc surfaces S1 arranged along the third direction Z; the sub-arc surfaces S1 are arc-shaped along the second direction Y and arranged along the third direction Z.

[0047] With this configuration, referring to the light ray diagrams of the thick-walled light-emitting structure 300 shown in Figure 4 and Figure 2, after the light emitted from the light source 100 passes through the first optical structure 200, a portion of the light passes through the interior of the thick-walled light-emitting structure 300 and then exits from the light-emitting surface 310, forming a near-beam elbow-shaped cutoff line light pattern and / or a near-beam broadened light pattern; another portion of the light passes through the dimming structure T1, is dispersed or converged by multiple sub-arc surfaces S1 along the third direction Z, and then exits from the light-emitting surface 310, forming the III-zone illumination light above the near-beam cutoff line. Specifically, as shown in Figure 2, the light incident on the dimming structure T1, for example, the light incident on the sidewall C1 of the first groove U1, is refracted by the sidewall C1 of the first groove U1, passes through the first groove U1, and is then refracted by the sidewall C2 of the first groove U1, thereby forming the III-zone illumination light above the near-beam cutoff line.

[0048] This disclosure does not limit the specific structure of the first optical structure 300. Considering that the illumination light in region III above the near light cutoff line is relatively weak, if the light emitted by the light source 100 reaches the dimming structure T1 relatively concentrated after passing through the first optical structure 200, the curvature of the two side walls C1 and C2 of the first groove U1, as well as the curvature of the multiple sub-arc surfaces S1, can be set so that the multiple sub-arc surfaces S1 diverge the incident light along the third direction Z (i.e., laterally), thereby forming the illumination light in region III above the near light cutoff line; if the light emitted by the light source 100 reaches the dimming structure T1 relatively dispersed after passing through the first optical structure 200, the curvature of the two side walls C1 and C2 of the first groove U1, as well as the curvature of the multiple sub-arc surfaces S1, can be set so that the multiple sub-arc surfaces S1 converge the incident light along the third direction Z (i.e., laterally), thereby forming the illumination light in region III above the near light cutoff line.

[0049] Optionally, the radii of curvature of the sidewalls C1 and C2 of the first groove Y1 are less than 10 mm; the spacing between the sub-arc surfaces S1 arranged along the third direction Z on the sidewalls C1 and / or C2 of the first groove Y1 can be 1 mm, and the radius of curvature of the sub-arc surfaces S1 can be 2 mm. However, this disclosure does not limit these, and the radii of curvature of the sidewalls C1 and C2 of the first groove Y1, as well as the spacing and radius of curvature of the sub-arc surfaces S1 arranged along the third direction Z on the sidewalls C1 and / or C2 of the first groove Y1, can be set according to the actual situation.

[0050] Therefore, the low beam module provided in this embodiment, by designing a dimming structure T1 on the second side 330 of its thick-walled light-emitting structure 300 instead of the light-emitting surface 310, utilizes the dimming structure T1 to form the III-zone illumination light above the low beam cutoff line. This allows for greater freedom in the design of the light-emitting surface of the thick-walled light-emitting structure 300, resulting in good static appearance consistency and meeting diverse styling requirements. Furthermore, since the light incident on the side of the thick-walled light-emitting structure 300 is typically stray light, the dimming structure T1 located on the second side 330 of the thick-walled light-emitting structure 300 converts some of the stray light into the III-zone illumination light above the low beam cutoff line, thereby improving the optical efficiency of the low beam module.

[0051] As previously known, the light incident on the side of the thick-walled light-emitting structure 300 is usually stray light. Therefore, optionally, as shown in Figures 1-4, and in conjunction with the top view of the thick-walled light-emitting structure 300 shown in Figure 5, it can be seen that the first side 320 and the second side 330 of the thick-walled light-emitting structure 300 are provided with multiple light-guiding tooth structures T2 arranged along the first direction X and extending along the third direction Z. The light-guiding tooth structures T2 protrude in a direction away from the thick-walled light-emitting structure 300. That is, taking the first side 320 of the thick-walled light-emitting structure 300 as being above its second side 330 as an example, the light-guiding tooth structures T2 on the first side 320 of the thick-walled light-emitting structure 300 protrude upwards. Similarly, the light-guiding tooth structures T2 on the second side 330 of the thick-walled light-emitting structure 300 protrude downwards. Figures 2 and 3 can more clearly show the light-guiding tooth structures T2 located on the second side 330 of the thick-walled light-emitting structure 300.

[0052] As shown in Figures 2 and 3, the light guide tooth structure T2 extends along the third direction Z and is arranged along the first direction X. The light guide tooth structure T2 is triangular pyramidal. To better understand the light guide tooth structure T2, Figure 6 further shows a partially enlarged schematic diagram of the light guide tooth structure T2 on the second side 330 of the thick-walled light-emitting structure 300. It can be seen that the light guide tooth structure T2 includes a first tooth surface T21, a second tooth surface T22, and a virtual surface T23 connecting the first tooth surface T21 and the second tooth surface T22. The first tooth surface T21 and the second tooth surface T22 can be seen from the first side 320 and the second side 330 of the thick-walled light-emitting structure 300, but the virtual surface T23 does not actually exist because the light guide tooth structure T2 and the thick-walled light-emitting structure 300 are integrally formed. For ease of description, the virtual surface T23 is defined as connecting the first tooth surface T21 and the second tooth surface T22. Thus, the virtual surface T23 of each light guide tooth structure T2 located on the first side 320 is the same plane, and the virtual surface T23 of each light guide tooth structure T2 located on the second side 330 is also the same plane.

[0053] Furthermore, as shown in Figure 6, in the light guide tooth structure T2, the first tooth surface T21 is located on the side of the second tooth surface T22 closer to the light-emitting surface 310. The angle θ1 between the first tooth surface T21 and the virtual surface T23 is greater than the angle θ2 between the second tooth surface T22 and the virtual surface T23. With this configuration, when the incident light reaches the first tooth surface T21 from inside the thick-walled light-emitting structure 300, the light is refracted. The refracted light continues to propagate to the second tooth surface T22. Moreover, the incident angle is relatively large. When the incident angle is greater than the critical angle, it is totally reflected off the second tooth surface T22, thereby dissipating some stray light. When the incident light reaches the second tooth surface T22 from inside the thick-walled light-emitting structure 300, the incident angle is relatively large. When the incident angle is greater than the critical angle, it will be totally reflected off the second tooth surface T22. This process reflects some stray light into the thick-walled light-emitting structure 300, where it may subsequently exit from the light-emitting surface 310 as part of the near-beam pattern, or dissipate from the light-emitting surface 310. It may also be reflected to the other side of the thick-walled light-emitting structure 300 and further reflected or refracted by the light guide tooth structure T2 on the other side. In short, stray light rays emitted from inside the thick-walled light-emitting structure 300 to the side of the thick-walled light-emitting structure 300, except for those reaching the dimming structure T1 to form the III zone illumination light above the near-beam cutoff line, can be dissipated by the light guide tooth structure T2. The light rays dissipated by the light guide tooth structure T2 undergo multiple reflections and refractions, continuously reducing their energy. Their illuminance and intensity values ​​will be reduced to a range invisible to the human eye, thus avoiding affecting the near-beam pattern.

[0054] In addition, the light guide tooth structure T2 protrudes in the direction away from the thick-walled light-emitting structure 300, so it will not affect the main light passing through the interior of the thick-walled light-emitting structure 300.

[0055] In practical applications, the material of the thick-walled light-emitting structure 300 can be polymethyl methacrylate (PMMA) or polycarbonate (PC). Based on this, optionally, in the light guide tooth structure T2, the included angle θ1 between the first tooth surface T21 and the virtual surface T23 can satisfy: 51° < θ1 < 90°, and the included angle θ2 between the second tooth surface T22 and the virtual surface T23 can satisfy: 5° < θ2 < 39°, so that the light guide tooth structure T2 can fully dissipate the incident stray light according to the above analysis process.

[0056] As previously known, after the light emitted from the light source 100 passes through the first optical structure 200, a portion of the light passes through the interior of the thick-walled light-emitting structure 300 and then exits from the light-emitting surface 310, forming a near-beam elbow-shaped cutoff line light pattern and / or a near-beam broadening light pattern. Optionally, the near-beam module is used to form a near-beam elbow-shaped cutoff line light pattern. As shown in Figure 1, the first optical structure 200 includes a first reflective focusing structure 210 and a first total reflection surface structure 220 arranged sequentially along the first direction X.

[0057] Figure 7 further shows a top perspective view of the low beam module provided in this embodiment. As shown in Figures 1 and 7, the first reflective focusing structure 210 includes a first light-incident surface 211 and a first reflective bowl surface 212. The first light-incident surface 211 is the surface of the first reflective focusing structure 210 that is away from the first total reflection surface structure 220. The first reflective bowl surface 212 is deflected relative to the first light-incident surface 211 toward the first total reflection surface structure 220. The first reflective focusing structure 210 also includes a first cut-off surface 213, which connects the first light-incident surface 211 and the first reflective bowl surface 212.

[0058] As shown in Figures 1 and 7, the first total reflection surface structure 220 includes a first total reflection surface 221 and a second total reflection surface 222 arranged opposite to each other along the second direction Y. The first total reflection surface 221 is connected to the first side surface 320, and the second total reflection surface 222 is connected to the second side surface 330. That is, the first total reflection surface structure 220 and the thick-walled light-emitting structure 300 are integrally formed structures.

[0059] Figure 8 further shows a side view of the first total reflection surface structure 220 and the thick-walled light-emitting structure 300 in the low beam module provided in this embodiment. Figure 9 further shows a bottom view of the first total reflection surface structure 220 and the thick-walled light-emitting structure 300 in the low beam module provided in this embodiment. As shown in Figures 8 and 9, a beam of parallel light is incident from the light-emitting surface 310, converged by the light-emitting surface 310, and then reflected sequentially by the first total reflection surface 221 and the second total reflection surface 222, focusing on the first focal point F. Furthermore, the distance L between the geometric center of the light-emitting surface 310 and the first focal point F along the first direction X is greater than the distance l between the second total reflection surface 222 and the first focal point F along the first direction X. Here, the distance L between the geometric center of the light-emitting surface 310 and the first focal point F along the first direction X represents the longitudinal focal length, and the distance l between the second total reflection surface 222 and the first focal point F along the first direction X represents the lateral focal length, that is, the longitudinal focal length is greater than the lateral focal length.

[0060] The light-emitting surface 310 is the outermost transparent surface of the low-beam module. It can be a convex surface along the second direction Y (i.e., longitudinal direction) to facilitate the focusing of parallel light incident from the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction). The second total reflection surface 222 can be a concave surface along the third direction Z (i.e., lateral direction) to facilitate the focusing of the beam of parallel light incident from the light-emitting surface 310 after reflection by the first total reflection surface 221 along the third direction Z (i.e., lateral direction). The first total reflection surface 221 can be a curved surface or a plane, used to match the light-emitting surface 310 and the second total reflection surface 222, and also plays a partial focusing role.

[0061] As shown in Figures 1 and 7, the light emitted by the light source 100 is incident through the first incident surface 211, converges to the first reflective surface 212, is reflected by the first reflective surface 212, and then is reflected by the second total reflection surface 222 and the first total reflection surface 221 in sequence before entering the thick-walled light-emitting structure 310 and exiting from the light-emitting surface 310. The shape of the first reflective surface 212 is projected as a near-beam elbow-shaped cutoff line light pattern, and the edge of the first reflective surface 212 near the first incident surface 211 is projected as the cutoff line of the near-beam elbow-shaped cutoff line light pattern.

[0062] Among them, the first light-incident surface 211 mainly plays the role of collecting and focusing light; the first reflective bowl surface 212 is a total internal reflection freeform surface, which mainly plays the role of collecting and focusing light and forming a near-beam elbow-shaped cutoff line light pattern.

[0063] The first focal point F is located on the edge of the first reflective surface 212 near the first incident surface 211. The edge of the first reflective surface 212 near the first incident surface 211 is also the intersection line of the first reflective surface 212 and the first cutoff surface 213. Since the light emitted by the light source 100, which converges to the first cutoff surface 213 through the first incident surface 211, is not reflected by the first cutoff surface 213, and the final emitted light is the light emitted by the light source 100, which converges to the first reflective surface 212 through the first incident surface 211 and is reflected by the first reflective surface 212, the shape of the first reflective surface 212 is projected as a near-beam elbow-shaped cutoff line light pattern, and the edge of the first reflective surface 212 near the first incident surface 211 (i.e., the intersection line of the first reflective surface 212 and the first cutoff surface 213) is projected as the cutoff line of the near-beam elbow-shaped cutoff line light pattern.

[0064] Since the near-beam elbow cutoff line light pattern is relatively concentrated in the near-beam light pattern, the light emitted by the light source 100 is relatively concentrated after passing through the first optical structure 200 and reaching the dimming structure T1. Therefore, in this embodiment, the multiple sub-arc surfaces S1 in the dimming structure T1 diverge the incident light along the third direction Z (i.e., the lateral direction), thereby forming the III zone illumination light above the near-beam cutoff line.

[0065] Compared to existing low beam headlight structures, current low beam headlights typically employ a combination of four optical components—a light source, a reflector, a baffle, and a lens—to achieve the low beam effect. The reflector focuses the light emitted from the light source onto a single point, the baffle blocks excess light to form a cutoff line, and the lens evenly distributes the light to create the low beam pattern. This traditional low beam module has a complex internal structure, occupies a large space, has large assembly tolerances, and is prone to irregular beam patterns. Furthermore, because light undergoes Fresnel reflection at interfaces when passing through different media, this traditional low beam module suffers from high Fresnel loss and low optical efficiency. Additionally, the lens aperture of this traditional low beam module is relatively large, resulting in poor appearance consistency.

[0066] In the low-beam module provided in this embodiment, the first total internal reflection surface structure 220 and the thick-walled light-emitting structure 300 are integrally formed, that is, the first total internal reflection surface structure 220 and the thick-walled light-emitting structure 300 are combined into a single-layer projection lens structure, which effectively reduces Fresnel loss. Moreover, by utilizing total internal reflection, the optical path can be folded and the size shortened, which improves light efficiency while reducing the volume and weight of the lens, thus contributing to energy saving and cost reduction. The projection focusing effect is mainly achieved by the light-emitting surface 310, the first total internal reflection surface 221 and the second total internal reflection surface 222, resulting in less refraction and thus less dispersion and better color uniformity of the projected light pattern. Furthermore, the longitudinal focal length is greater than the lateral focal length, which facilitates the realization of a laterally wide and longitudinally narrow elbow-shaped cutoff line for low-beam light. The shape also helps to narrow the opening size of the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction). For example, the opening size of the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction) can be about 10mm. In addition, the light-emitting surface 310 can be a complete free-form surface, and the first total reflection surface 221 can be a complete free-form surface or a plane, which makes the static appearance of the lens more consistent and helps to meet different shape requirements such as the horizontal elongated module shape. The combination of the first total reflection surface structure 220 and the thick-walled light-emitting structure 300 into a single-layer projection lens structure can also reduce assembly tolerances, reduce costs, improve the controllability of light pattern, and avoid the problem of multi-layer lenses being burned due to focusing when exposed to sunlight.

[0067] Further optionally, as shown in Figures 1 and 7, the first reflective focusing structure 210, the first total reflection surface structure 220, and the thick-walled light-emitting structure 300 are integrally formed structures, that is, the first optical structure 200 and the thick-walled light-emitting structure 300 are integrally formed structures, thereby further shortening the dimensional chain, reducing the lens volume and weight, reducing assembly tolerances, reducing costs, further reducing Fresnel loss, improving optical efficiency, and further reducing dispersion and improving color uniformity.

[0068] As previously known, after the light emitted from the light source 100 passes through the first optical structure 200, a portion of the light passes through the interior of the thick-walled light-emitting structure 300 and then exits from the light-emitting surface 310, forming a near-beam elbow-shaped cutoff line light pattern and / or a near-beam broadening light pattern. Alternatively, the near-beam module is used to form a near-beam broadening light pattern, as shown in Figure 1. The first optical structure 200 includes a second reflective focusing structure 230 and a second total reflection surface structure 240 arranged sequentially along the first direction X.

[0069] Figure 10 further shows a top perspective view of the low beam module provided in this embodiment. As shown in Figures 1 and 10, the second reflective focusing structure 230 includes a second light-incident surface 231 and a second reflective bowl surface 232. The second light-incident surface 231 is the surface of the second reflective focusing structure 230 that is away from the second total reflection surface structure 240. The second reflective bowl surface 232 is deflected relative to the second light-incident surface 231 toward the second total reflection surface structure 240. The second reflective focusing structure 230 also includes a second cut-off surface 233, which connects the second light-incident surface 231 and the second reflective bowl surface 232.

[0070] As shown in Figures 1 and 10, the second total reflection surface structure 240 includes a third total reflection surface 241 and a fourth total reflection surface 242 arranged opposite to each other along the second direction Y. The third total reflection surface 241 is connected to the first side surface 320, and the fourth total reflection surface 242 is connected to the second side surface 330. That is, the second total reflection surface structure 240 and the thick-walled light-emitting structure 300 are integrally formed structures.

[0071] Figure 11 further shows a side view of the second total reflection surface structure 240 and the thick-walled light-emitting structure 300 in the low beam module provided in this embodiment. Figure 12 further shows a bottom view of the second total reflection surface structure 240 and the thick-walled light-emitting structure 300 in the low beam module provided in this embodiment. As shown in Figures 11 and 12, a beam of parallel light is incident from the light-emitting surface 310, converged by the light-emitting surface 310, and then reflected sequentially by the third total reflection surface 241 and the fourth total reflection surface 242, converging at the first focal line FF.

[0072] As previously known, the light-emitting surface 310 is the outermost transparent surface of the near-beam module, and can be a convex surface along the second direction Y (i.e., longitudinal direction) to facilitate the focusing of parallel light incident from the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction). The third total internal reflection surface 241 and the fourth total internal reflection surface 242 can be curved or planar, used to match the light-emitting surface 310, and also serve to partially focus and fold the optical path. In other words, the single-layer projection lens structure, which is integrally formed by the second total internal reflection surface structure 240 and the thick-walled light-emitting structure 300, mainly achieves longitudinal focusing of parallel light incident from the light-emitting surface 310.

[0073] As shown in Figures 1 and 10, the light emitted from the light source 300 is incident through the second incident surface 231, converges to the second reflective surface 232, and after being reflected by the second reflective surface 232, it is reflected by the fourth total reflection surface 242 and the third total reflection surface 241 in sequence, enters the thick-walled light-emitting structure 300, and then exits from the light-emitting surface 310. The shape of the second reflective surface 232 is projected as a near-beam broadening light pattern, and the edge of the second reflective surface 232 near the second incident surface 231 is projected as the cutoff line of the near-beam broadening light pattern.

[0074] Among them, the second light-incident surface 231 mainly plays the role of collecting and focusing light; the second reflective bowl surface 232 is a total internal reflection freeform surface, which mainly plays the role of collecting and focusing light and forming a near-beam broadening light pattern.

[0075] The first focal line FF is located on the edge of the second reflective surface 232 near the second incident surface 231. The edge of the second reflective surface 232 near the second incident surface 231 is also the intersection line of the second reflective surface 232 and the second cutoff surface 233. Since the light emitted by the light source 100, which converges to the second cutoff surface 233 through the second incident surface 231, is not reflected by the second cutoff surface 233, and the final emitted light is the light emitted by the light source 100, which converges to the second reflective surface 232 through the second incident surface 231 and is reflected by the second reflective surface 232, the shape of the second reflective surface 232 is projected as a near-beam broadening light pattern, and the edge of the second reflective surface 232 near the second incident surface 231 (i.e., the intersection line of the second reflective surface 232 and the second cutoff surface 233) is projected as the cutoff line of the near-beam broadening light pattern.

[0076] Because the near beam broadening pattern is relatively divergent in the near beam pattern, the light emitted by the light source 100 is relatively divergent when it reaches the dimming structure T1 after passing through the first optical structure 200. Therefore, in this embodiment, the multiple sub-arc surfaces S1 in the dimming structure T1 converge the incident light along the third direction Z (i.e., the lateral direction), thereby forming the III zone illumination light above the near beam cutoff line.

[0077] As previously known, the single-layer projection lens structure formed by the first total reflection surface structure 220 and the thick-walled light-emitting structure 300 is mainly used to achieve longitudinal focusing, while the second reflection light-collecting structure 230 is mainly used to achieve lateral focusing. This achieves separation of longitudinal and lateral focusing, and the longitudinal focusing is greater than the lateral focal length.

[0078] Compared to existing low beam structures, the low beam module provided in this embodiment features a single-layer projection lens structure where the second total internal reflection surface structure 240 and the thick-walled light-emitting structure 300 are integrally formed. This effectively reduces Fresnel loss and, by utilizing total internal reflection, allows for optical path folding and size reduction. This improves luminous efficiency while minimizing lens volume and weight, thus contributing to energy saving and cost reduction. The projection focusing effect is primarily achieved by the light-emitting surface 310, the third total internal reflection surface 241, and the fourth total internal reflection surface 242, resulting in less refraction and thus lower dispersion and better color uniformity of the projected light. Furthermore, the longitudinal focal length is greater than the lateral focal length, facilitating the achievement of a low beam that is wider laterally and narrower longitudinally. The widening of the light pattern also helps to narrow the opening size of the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction). For example, the opening size of the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction) can be about 10mm. In addition, the light-emitting surface 310 can be a complete free-form surface, and the third total reflection surface 241 can be a complete free-form surface or a plane, which makes the static appearance of the lens more consistent and helps to meet different shape requirements such as horizontally elongated module shapes. The combination of the second total reflection surface structure 240 and the thick-walled light-emitting structure 300 into a single-layer projection lens structure can also reduce assembly tolerances, reduce costs, improve the controllability of the light pattern, and avoid the problem of multi-layer lenses being burned due to focusing sunlight.

[0079] Further optionally, as shown in Figures 1 and 7, the second reflective focusing structure 230, the second total reflection surface structure 240, and the thick-walled light-emitting structure 300 are integrally formed structures, that is, the first optical structure 100 and the thick-walled light-emitting structure 300 are integrally formed structures. This can further shorten the dimensional chain, reduce the lens volume and weight, reduce assembly tolerances, reduce costs, further reduce Fresnel loss, improve optical efficiency, and further reduce dispersion and improve color uniformity.

[0080] As previously known, after the light emitted from the light source 100 passes through the first optical structure 200, a portion of the light passes through the interior of the thick-walled light-emitting structure 300 and then exits from the light-emitting surface 310, forming a near-beam elbow-shaped cutoff line light pattern and / or a near-beam broadening light pattern. Alternatively, the near-beam module is used to simultaneously form a near-beam elbow-shaped cutoff line light pattern and a near-beam broadening light pattern, as shown in Figure 1. The first optical structure 200 includes a first reflective focusing structure 210 and a first total reflection surface structure 220 arranged sequentially along the first direction X, and a second reflective focusing structure 230 and a second total reflection surface structure 240 arranged sequentially along the first direction X. The first reflective focusing structure 210 and the second reflective focusing structure 230 are arranged side by side along the third direction Z, and the first total reflection surface structure 220 and the second total reflection surface structure 240 are arranged side by side along the third direction Z.

[0081] Figure 13 further shows a top perspective view of the low beam module provided in this embodiment. As shown in Figures 1 and 13, the first reflective focusing structure 210 includes a first light-incident surface 211 and a first reflective bowl surface 212. The first light-incident surface 211 is the surface of the first reflective focusing structure 210 that is away from the first total reflection surface structure 220. The first reflective bowl surface 212 is deflected relative to the first light-incident surface 211 toward the first total reflection surface structure 220. The first reflective focusing structure 210 also includes a first cut-off surface 213, which connects the first light-incident surface 211 and the first reflective bowl surface 212.

[0082] As shown in Figures 1 and 13, the first total reflection surface structure 220 includes a first total reflection surface 221 and a second total reflection surface 222 arranged opposite to each other along the second direction Y. The first total reflection surface 221 is connected to the first side surface 320, and the second total reflection surface 222 is connected to the second side surface 330. That is, the first total reflection surface structure 220 and the thick-walled light-emitting structure 300 are integrally formed structures.

[0083] In the low beam module provided in this embodiment, the side view of the first total reflection surface structure 220 and the thick-walled light-emitting structure 300 is shown in Figure 8, and the bottom view is shown in Figure 9. As shown in Figures 8 and 9, a beam of parallel light is incident from the light-emitting surface 310, converged by the light-emitting surface 310, and then reflected sequentially by the first total reflection surface 221 and the second total reflection surface 222, focusing on the first focal point F. Furthermore, the distance L between the geometric center of the light-emitting surface 310 and the first focal point F along the first direction X is greater than the distance l between the second total reflection surface 222 and the first focal point F along the first direction X. Here, the distance L between the geometric center of the light-emitting surface 310 and the first focal point F along the first direction X represents the longitudinal focal length, and the distance l between the second total reflection surface 222 and the first focal point F along the first direction X represents the lateral focal length, that is, the longitudinal focal length is greater than the lateral focal length.

[0084] The light-emitting surface 310 is the outermost transparent surface of the low-beam module. It can be a convex surface along the second direction Y (i.e., longitudinal direction) to facilitate the focusing of parallel light incident from the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction). The second total reflection surface 222 can be a concave surface along the third direction Z (i.e., lateral direction) to facilitate the focusing of the beam of parallel light incident from the light-emitting surface 310 after reflection by the first total reflection surface 221 along the third direction Z (i.e., lateral direction). The first total reflection surface 221 can be a curved surface or a plane, used to match the light-emitting surface 310 and the second total reflection surface 222, and also plays a partial focusing role.

[0085] As shown in Figures 1 and 13, the light emitted by the light source 100 is incident through the first incident surface 211, converges to the first reflective surface 212, is reflected by the first reflective surface 212, and then is reflected by the second total reflection surface 222 and the first total reflection surface 221 in sequence before entering the thick-walled light-emitting structure 310 and exiting from the light-emitting surface 310. The shape of the first reflective surface 212 is projected as a near-beam elbow-shaped cutoff line light pattern, and the edge of the first reflective surface 212 near the first incident surface 211 is projected as the cutoff line of the near-beam elbow-shaped cutoff line light pattern.

[0086] Among them, the first light-incident surface 211 mainly plays the role of collecting and focusing light; the first reflective bowl surface 212 is a total internal reflection freeform surface, which mainly plays the role of collecting and focusing light and forming a near-beam elbow-shaped cutoff line light pattern.

[0087] The first focal point F is located on the edge of the first reflective surface 212 near the first incident surface 211. The edge of the first reflective surface 212 near the first incident surface 211 is also the intersection line of the first reflective surface 212 and the first cutoff surface 213. Since the light emitted by the light source 100, which converges to the first cutoff surface 213 through the first incident surface 211, is not reflected by the first cutoff surface 213, and the final emitted light is the light emitted by the light source 100, which converges to the first reflective surface 212 through the first incident surface 211 and is reflected by the first reflective surface 212, the shape of the first reflective surface 212 is projected as a near-beam elbow-shaped cutoff line light pattern, and the edge of the first reflective surface 212 near the first incident surface 213 (i.e., the intersection line of the first reflective surface 212 and the first cutoff surface 213) is projected as the cutoff line of the near-beam elbow-shaped cutoff line light pattern.

[0088] As shown in Figures 1 and 13, the second total reflection surface structure 240 includes a third total reflection surface 241 and a fourth total reflection surface 242 arranged opposite to each other along the second direction Y. The third total reflection surface 241 is connected to the first side surface 320, and the fourth total reflection surface 242 is connected to the second side surface 330. That is, the second total reflection surface structure 240 and the thick-walled light-emitting structure 300 are integrally formed structures.

[0089] In the low beam module provided in this embodiment, the side view of the second total reflection surface structure 240 and the thick-walled light-emitting structure 300 as a whole is shown in Figure 11, and the bottom view is shown in Figure 12. As shown in Figures 11 and 12, a beam of parallel light is incident from the light-emitting surface 310, converged by the light-emitting surface 310, and then reflected by the third total reflection surface 241 and the fourth total reflection surface 242 in sequence, converging at the first focal line FF.

[0090] As previously known, the light-emitting surface 310 is the outermost transparent surface of the near-beam module, and can be a convex surface along the second direction Y (i.e., longitudinal direction) to facilitate the focusing of parallel light incident from the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction). The third total internal reflection surface 241 and the fourth total internal reflection surface 242 can be curved or planar, used to match the light-emitting surface 310, and also serve to partially focus and fold the optical path. In other words, the single-layer projection lens structure, which is integrally formed by the second total internal reflection surface structure 240 and the thick-walled light-emitting structure 300, mainly achieves longitudinal focusing of parallel light incident from the light-emitting surface 310.

[0091] As shown in Figures 1 and 13, the light emitted from the light source 300 is incident through the second incident surface 231, converges to the second reflective surface 232, and after being reflected by the second reflective surface 232, it is reflected by the fourth total reflection surface 242 and the third total reflection surface 241 in sequence, enters the thick-walled light-emitting structure 300, and then exits from the light-emitting surface 310. The shape of the second reflective surface 232 is projected as a near-beam broadening light pattern, and the edge of the second reflective surface 232 near the second incident surface 231 is projected as the cutoff line of the near-beam broadening light pattern.

[0092] Among them, the second light-incident surface 231 mainly plays the role of collecting and focusing light; the second reflective bowl surface 232 is a total internal reflection freeform surface, which mainly plays the role of collecting and focusing light and forming a near-beam broadening light pattern.

[0093] The first focal line FF is located on the edge of the second reflective surface 232 near the second incident surface 231. The edge of the second reflective surface 232 near the second incident surface 231 is also the intersection line of the second reflective surface 232 and the second cutoff surface 233. Since the light emitted by the light source 100, which converges to the second cutoff surface 233 through the second incident surface 231, is not reflected by the second cutoff surface 233, and the final emitted light is the light emitted by the light source 100, which converges to the second reflective surface 232 through the second incident surface 231 and is reflected by the second reflective surface 232, the shape of the second reflective surface 232 is projected as a near-beam broadening light pattern, and the edge of the second reflective surface 232 near the second incident surface 231 (i.e., the intersection line of the second reflective surface 232 and the second cutoff surface 233) is projected as the cutoff line of the near-beam broadening light pattern.

[0094] As previously known, the single-layer projection lens structure formed by the first total reflection surface structure 220 and the thick-walled light-emitting structure 300 is mainly used to achieve longitudinal focusing, while the second reflection light-collecting structure 230 is mainly used to achieve lateral focusing. This achieves separation of longitudinal and lateral focusing, and the longitudinal focusing is greater than the lateral focal length.

[0095] In this embodiment, the first reflective focusing structure 210, the first total reflection surface structure 220, and the thick-walled light-emitting structure 300 are combined to form a near-beam elbow-shaped lens module unit, used to form a near-beam elbow-shaped cutoff line light pattern; the second reflective focusing structure 230, the second total reflection surface structure 240, and the thick-walled light-emitting structure 300 are combined to form a near-beam broadening lens module unit, used to form a near-beam broadening light pattern; the near-beam module may include one or more near-beam elbow-shaped lens module units, or it may include one or more near-beam broadening lens module units. Furthermore, the first total reflection surface structure 220 and the thick-walled light-emitting structure 300 are integrally formed, and the second total reflection surface structure 240 is also integrally formed with the thick-walled light-emitting structure 300. That is, the first total reflection surface structure 220, the second total reflection surface structure 240, and the thick-walled light-emitting structure 300 are integrally formed. Thus, the first total reflection surface 221 and the third total reflection surface 241 can be combined to form a complete smooth plane or curved surface, resulting in good consistency in the static appearance of the lens.

[0096] Compared to existing low beam structures, the low beam module provided in this embodiment features a single-piece structure where the first total internal reflection surface 220 and the thick-walled light-emitting structure 300 are integrated, as are the second total internal reflection surface 240 and the thick-walled light-emitting structure 300. This means the first total internal reflection surface 220 and the thick-walled light-emitting structure 300 are combined into a single-layer projection lens structure, and the second total internal reflection surface 240 and the thick-walled light-emitting structure 300 are also combined into a single-layer projection lens structure. This effectively reduces Fresnel loss, and by utilizing total internal reflection, the light path can be folded, shortening the size. This improves luminous efficiency while reducing the size and weight of the lens, contributing to energy saving and cost reduction. The projection focusing effect is mainly achieved by the light-emitting surface 310, the first total internal reflection surface 221 / the third total internal reflection surface 241, the second total internal reflection surface 222, and the fourth total internal reflection surface 242. This results in less refraction, leading to less dispersion and better color uniformity of the projected light. Furthermore, the longitudinal focus... The focal length is greater than the lateral focal length, which facilitates the realization of a wide lateral and narrow longitudinal near-beam beam pattern. It also helps to narrow the opening size of the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction). For example, the opening size of the light-emitting surface 310 along the second direction Y (i.e., longitudinal direction) can be about 10mm. In addition, the light-emitting surface 310 can be a complete free-form surface. The first total reflection surface 221 / the third total reflection surface 241 can be a complete free-form surface or a plane, which makes the static appearance of the lens consistent and helps to meet different shape requirements such as the horizontally elongated module shape. The first total reflection surface structure 220 and the thick-walled light-emitting structure 300 are combined into a single-layer projection lens structure, and the second total reflection surface structure 240 and the thick-walled light-emitting structure 300 are also combined into a single-layer projection lens structure. This can also reduce assembly tolerances, reduce costs, improve beam pattern controllability, and avoid the problem of multi-layer lenses being burned due to focusing when exposed to sunlight.

[0097] Since the near-beam elbow cutoff line light pattern is relatively concentrated in the near-beam light pattern, the light emitted by the light source 100 is relatively concentrated after passing through the first optical structure 200 and reaching the dimming structure T1. Therefore, in this embodiment, the multiple sub-arc surfaces S1 in the dimming structure T1 diverge the incident light along the third direction Z (i.e., the lateral direction), thereby forming the III zone illumination light above the near-beam cutoff line.

[0098] Further optionally, as shown in Figures 1 and 13, the first reflective focusing structure 210, the first total reflective surface structure 220, the second reflective focusing structure 230, the second total reflective surface structure 240, and the thick-walled light-emitting structure 300 are integrally formed structures, with the first reflective focusing structure 210 and the second reflective focusing structure 230 arranged side-by-side along the third direction Z. In this embodiment, the first total reflective surface 221 and the third total reflective surface 241 can be combined to form a complete smooth plane or curved surface; the second total reflective surface 222 and the fourth total reflective surface 242 are arranged side-by-side along the third direction Z; the first reflective bowl surface 212 and the second reflective bowl surface 232 are arranged side-by-side along the third direction Z; the first light-incident surface 211 and the second light-incident surface 231 are arranged side-by-side along the third direction Z. Optionally, the first light-incident surface 211 and the second light-incident surface 231 can also be combined to form a complete smooth plane or curved surface. This configuration can further shorten the dimension chain, reduce lens volume and weight, reduce assembly tolerances, lower costs, further reduce Fresnel loss, improve optical efficiency, and further reduce dispersion and improve color uniformity.

[0099] To better understand this disclosure, Figure 14 shows a side view of the main beam trace of the low beam module provided in this embodiment; Figure 15 shows a side view of the beam trace near the cutoff line of the low beam module provided in this embodiment; Figure 16 shows a top view of the beam trace near the elbow-shaped cutoff line of the low beam module provided in this embodiment; Figure 17 shows a top view of the beam trace of the low beam broadening of the low beam module provided in this embodiment; and Figure 18 shows a side view of the beam trace of the low beam module forming the III zone illumination light above the low beam cutoff line.

[0100] Optionally, as shown in Figures 10 and 13, the second reflective focusing structure 230 includes two second reflective bowls 232. These two second reflective bowls 232 are arranged side by side adjacent to each other along the third direction Z, and are symmetrically arranged along the first direction X. These two second reflective bowls 232 correspond to the same second total reflection surface structure 240, that is, they correspond to the same third total reflection surface 241 and the same fourth total reflection surface 242.

[0101] With this configuration, as shown in Figure 17, the light rays emitted from the two second reflective bowls 232 are distributed in a cross direction Z (lateral direction). That is, along the third direction Z (lateral direction), the light rays emitted from the left second reflective bowl 232 are distributed in the right half, and the light rays emitted from the right second reflective bowl 232 are distributed in the left half, which is beneficial for expanding the emitted light pattern along the third direction Z (lateral direction).

[0102] Alternatively, there can be only one second reflector 232. By adjusting the shape of the second reflector 232, the beam pattern of the emitted near beam can also be broadened.

[0103] Based on any of the above embodiments, since the first total reflection surface 221 and the second total reflection surface 222 are arranged opposite to each other along the second direction Y, some of the light reflected from the first reflection surface 212 may reach the vicinity of the second side surface 330 of the thick-walled light-emitting structure 300 without passing through the second total reflection surface 222 and the first total reflection surface 221. Alternatively, some of the light reflected from the first reflection surface 212 may reach the vicinity of the second side surface 330 of the thick-walled light-emitting structure 300 even if it passes through the second total reflection surface 222 and the first total reflection surface 221. The light that reaches the vicinity of the second side surface 330 of the thick-walled light-emitting structure 300 does not contribute to the near-beam pattern and can be considered as stray light. Although the aforementioned embodiments have used a dimming structure T1 to convert some stray light reaching the second side 330 of the thick-walled light-emitting structure 300 into III-zone illumination light above the near-light cutoff line, and used a light guide tooth structure T2 to dissipate stray light reaching both sides of the thick-walled light-emitting structure 300, it may still be insufficient to completely dissipate the stray light reaching the second side 330 of the thick-walled light-emitting structure 300.

[0104] Based on this, as shown in Figures 1-3, the second side 330 of the thick-walled light-emitting structure 300 is further provided with a second groove U2 extending along the third direction Z. The second groove U2 is located on the side of the first groove U1 near the first optical structure 100. The width w3 of the bottom of the second groove U1 along the first direction X is smaller than the width w4 of the opening of the second groove U2 along the first direction X. Thus, the two side walls C3 and C4 of the second groove U2 are both arc-shaped surfaces. The bottom of the second groove U2 and the two side walls C3 and C4 constitute a light-blocking structure T3.

[0105] Optionally, the radii of curvature of the two sidewalls C3 and C4 of the second groove U2 are less than 10 mm, but this disclosure does not limit this, and the radii of curvature of the two sidewalls C3 and C4 of the second groove U2 can be set according to the actual situation.

[0106] Figure 19 shows a side view schematic diagram of stray light tracing of the low beam module provided in this embodiment. It can be seen that after the light emitted by the light source 100 passes through the first optical structure 200, part of the light reaches the light blocking structure T2. Part of the light that passes through the light blocking structure T2 reaches the dimming structure T1 to form the III zone illumination light above the low beam cutoff line. Another part of the light reaches the light guide tooth structure T2 and is dissipated by the light guide tooth structure T2. Yet another part of the light reaches the light emitting surface 310, but does not form a low beam pattern. Instead, it is refracted by the light emitting surface 310 to a higher region of the beam pattern, which is outside the visible angle range of the human eye.

[0107] As shown in Figure 2, the distance between the dimming structure T1 and the light-blocking structure T2 along the first direction X is S. The inventors have found that when S decreases, the intensity of the illumination light in Zone III above the formed near beam cutoff line weakens, and when S increases, the intensity of the illumination light in Zone III above the formed near beam cutoff line increases. S can be set according to actual needs.

[0108] Figure 20 shows the lighting effect of a low beam elbow cutoff line light pattern formed by a low beam module according to an embodiment of the present disclosure. Figure 21 shows the lighting effect of a low beam broadening light pattern formed by a low beam module according to an embodiment of the present disclosure. Figure 22 shows the lighting effect of a complete low beam light pattern formed by combining a low beam elbow cutoff line light pattern formed by a low beam module with a low beam broadening light pattern according to an embodiment of the present disclosure.

[0109] The various parts of this manual are described in a combination of parallel and progressive methods. Each part focuses on the differences between the other parts, and the same or similar parts can be referred to each other.

[0110] The features described above regarding the disclosed embodiments can be substituted or combined with each other to enable those skilled in the art to implement or use this disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low beam module, comprising a light source, a first optical structure, and a thick-walled light-emitting structure arranged sequentially along a first direction, wherein the surface of the thick-walled light-emitting structure facing away from the first optical structure is a light-emitting surface, and the side surface of the thick-walled light-emitting structure includes a first side surface and a second side surface arranged opposite to each other along a second direction, wherein the first direction and the second direction are perpendicular. The second side is provided with a first groove extending along a third direction, which is perpendicular to the first direction and perpendicular to the second direction; the width of the bottom of the first groove along the first direction is less than the width of the opening of the first groove along the first direction; both sidewalls of the first groove are arc-shaped surfaces; the bottom of the first groove and the two sidewalls constitute a dimming structure; at least one of the two sidewalls of the first groove includes a plurality of sub-arc-shaped surfaces arranged along the third direction. After the light emitted by the light source passes through the first optical structure, part of the light passes through the interior of the thick-walled light-emitting structure and then exits from the light-emitting surface, forming a near-beam elbow-shaped cutoff line light pattern and / or a near-beam broadening light pattern; another part of the light passes through the dimming structure and is dispersed or converged by multiple sub-arc surfaces along the third direction, and then exits from the light-emitting surface, forming the III-zone illumination light above the near-beam cutoff line.

2. The low beam module according to claim 1, wherein, The first side and the second side are provided with a plurality of light guide tooth structures arranged along the first direction and extending along the third direction, and the light guide tooth structures protrude in a direction away from the thick-walled light-emitting structure; The light guide tooth structure is triangular pyramidal in shape. The light guide tooth structure includes a first tooth surface, a second tooth surface, and a virtual surface connecting the first tooth surface and the second tooth surface. The virtual surfaces of each light guide tooth structure located on the first side are on the same plane, and the virtual surfaces of each light guide tooth structure located on the second side are on the same plane. The first tooth surface is located on the side of the second tooth surface closer to the light-emitting surface, and the angle between the first tooth surface and the virtual surface is greater than the angle between the second tooth surface and the virtual surface.

3. The low beam module according to claim 2, wherein, The included angle θ1 between the first tooth surface and the virtual surface satisfies: 51° < θ1 < 90°; The included angle θ2 between the second tooth surface and the virtual surface satisfies: 5° < θ2 < 39°.

4. The low beam module according to claim 1 or 2, wherein, The first optical structure includes a first reflective focusing structure and a first total reflection surface structure arranged sequentially along the first direction; The first reflective focusing structure includes a first light-incident surface and a first reflective bowl surface. The first light-incident surface is the surface of the first reflective focusing structure that is away from the first total reflection surface structure. The first reflective bowl surface is deflected relative to the first light-incident surface towards the first total reflection surface structure. The first total reflection surface structure includes a first total reflection surface and a second total reflection surface arranged opposite to each other along the second direction. The first total reflection surface is connected to the first side surface, and the second total reflection surface is connected to the second side surface. A beam of parallel light is incident from the light-emitting surface, converged by the light-emitting surface, and then reflected sequentially by the first total reflection surface and the second total reflection surface to focus on a first focal point. The first focal point is located on the edge of the first reflective bowl surface near the first incident surface. The light emitted by the light source is incident on the first incident surface, converges to the first reflective bowl surface, is reflected by the first reflective bowl surface, and then is reflected by the second total reflection surface and the first total reflection surface in sequence before entering the thick-walled light-emitting structure and exiting from the light-emitting surface. The shape of the first reflective bowl surface is projected as a near-beam elbow-shaped cutoff line light pattern, and the edge of the first reflective bowl surface near the first incident surface is projected as the cutoff line of the near-beam elbow-shaped cutoff line light pattern. In the dimming structure, the multiple sub-arc surfaces diverge the incident light along the third direction.

5. The low beam module according to claim 4, wherein, The distance between the geometric center of the light-emitting surface and the first focal point along the first direction is the longitudinal focal length, and the distance between the second total reflection surface and the first focal point along the first direction is the lateral focal length. The longitudinal focal length is greater than the lateral focal length.

6. The low beam module according to claim 4 or 5, wherein, The first reflective focusing structure further includes a first cut-off surface, which connects the first incident light surface and the first reflective bowl surface; the first focal point is located on the edge of the first reflective bowl surface near the first incident light surface, and the edge of the first reflective bowl surface near the first incident light surface is the intersection line of the first reflective bowl surface and the first cut-off surface.

7. The low beam module according to claim 1 or 2, wherein, The first optical structure includes a second reflective focusing structure and a second total reflection surface structure arranged sequentially along the first direction; The second reflective focusing structure includes a second light-incident surface and a second reflective bowl surface. The second light-incident surface is the surface of the second reflective focusing structure that is away from the second total reflection surface structure. The second reflective bowl surface is deflected relative to the second light-incident surface towards the second total reflection surface structure. The second total reflection surface structure includes a third total reflection surface and a fourth total reflection surface arranged opposite to each other along the second direction. The third total reflection surface is connected to the first side surface, and the fourth total reflection surface is connected to the second side surface. A beam of parallel light is incident from the light-emitting surface, converged by the light-emitting surface, and then reflected sequentially by the third and fourth total reflection surfaces to converge at a first focal line. The first focal line is located on the edge of the second reflective surface near the second incident surface. The light emitted by the light source is incident on the second incident surface, converges to the second reflective bowl surface, is reflected by the second reflective bowl surface, and then is reflected by the fourth total reflection surface and the third total reflection surface in sequence before entering the thick-walled light-emitting structure and exiting from the light-emitting surface. The shape of the second reflective bowl surface is projected as a near-beam broadening light pattern, and the edge of the second reflective bowl surface near the second incident surface is projected as the cutoff line of the near-beam broadening light pattern. In the dimming structure, multiple sub-arc surfaces converge the incident light rays along the third direction.

8. The low beam module according to claim 7, wherein, The second reflective focusing structure further includes a second cut-off surface, which connects the second incident light surface and the second reflective bowl surface; the first focal line is located on the edge of the second reflective bowl surface near the second incident light surface, and the edge of the second reflective bowl surface near the second incident light surface is the intersection line of the second reflective bowl surface and the second cut-off surface.

9. The low beam module according to claim 1 or 2, wherein, The first optical structure includes a first reflective focusing structure and a first total reflection surface structure arranged sequentially along the first direction, and a second reflective focusing structure and a second total reflection surface structure arranged sequentially along the first direction. The first reflective focusing structure includes a first light-incident surface and a first reflective bowl surface. The first light-incident surface is the surface of the first reflective focusing structure that is away from the first total reflection surface structure. The first reflective bowl surface is deflected relative to the first light-incident surface towards the first total reflection surface structure. The first total reflection surface structure includes a first total reflection surface and a second total reflection surface arranged opposite to each other along the second direction. The first total reflection surface is connected to the first side surface, and the second total reflection surface is connected to the second side surface. A beam of parallel light is incident from the light-emitting surface, converged by the light-emitting surface, and then reflected sequentially by the first total reflection surface and the second total reflection surface to focus on a first focal point. The first focal point is located on the edge of the first reflective bowl surface near the first incident surface. The light emitted by the light source is incident on the first incident surface, converges to the first reflective bowl surface, is reflected by the first reflective bowl surface, and then is reflected by the second total reflection surface and the first total reflection surface in sequence before entering the thick-walled light-emitting structure and exiting from the light-emitting surface. The shape of the first reflective bowl surface is projected as a near-beam elbow-shaped cutoff line light pattern, and the edge of the first reflective bowl surface near the first incident surface is projected as the cutoff line of the near-beam elbow-shaped cutoff line light pattern. In the dimming structure, the multiple sub-arc surfaces diverge the incident light along the third direction. The second reflective focusing structure includes a second light-incident surface and a second reflective bowl surface. The second light-incident surface is the surface of the second reflective focusing structure that is away from the second total reflection surface structure. The second reflective bowl surface is deflected relative to the second light-incident surface towards the second total reflection surface structure. The second total reflection surface structure includes a third total reflection surface and a fourth total reflection surface arranged opposite to each other along the second direction. The third total reflection surface is connected to the first side surface, and the fourth total reflection surface is connected to the second side surface. A beam of parallel light is incident from the light-emitting surface, converged by the light-emitting surface, and then reflected sequentially by the third and fourth total reflection surfaces to converge at a first focal line. The first focal line is located on the edge of the second reflective surface near the second incident surface. The light emitted by the light source is incident on the second incident surface, converges to the second reflective bowl surface, is reflected by the second reflective bowl surface, and then is reflected by the fourth total reflection surface and the third total reflection surface in sequence before entering the thick-walled light-emitting structure and exiting from the light-emitting surface. The shape of the second reflective bowl surface is projected as a near-beam broadening light pattern, and the edge of the second reflective bowl surface near the second incident surface is projected as the cutoff line of the near-beam broadening light pattern.

10. The low beam module according to any one of claims 2 to 9, wherein, The second side is also provided with a second groove extending along the third direction. The second groove is located on the side of the first groove close to the first optical structure. The width of the bottom of the second groove along the first direction is smaller than the width of the opening of the second groove along the first direction. The bottom of the second groove and the two sidewalls form a light-blocking structure. After the light emitted by the light source passes through the first optical structure, part of the light reaches the light-blocking structure, part of the light that passes through the light-blocking structure reaches the dimming structure, another part of the light reaches the light guide tooth structure, and yet another part of the light reaches the light-emitting surface, but does not form a near-beam pattern.

11. The low beam module according to claim 4 or 9, wherein, The first reflective light-concentrating structure, the first total reflective surface structure, and the thick-walled light-emitting structure are integrally formed.

12. The low beam module according to claim 7 or 9, wherein, The second reflective light-concentrating structure, the second total reflective surface structure, and the thick-walled light-emitting structure are integrally formed.

13. The low beam module according to claim 9, wherein, The first reflective focusing structure, the first total reflective surface structure, the second reflective focusing structure, the second total reflective surface structure, and the thick-walled light-emitting structure are integrally formed. The first total reflection surface and the third total reflection surface combine to form a complete smooth plane or curved surface; The second total reflection surface and the fourth total reflection surface are arranged side by side along the third direction; The first reflective surface and the second reflective surface are arranged side by side along the third direction; The first incident light surface and the second incident light surface combine to form a complete smooth plane or curved surface.

14. The low beam module according to claim 7 or 9, wherein, The second reflective focusing structure includes two second reflective bowls, which are arranged side by side adjacent to each other along the third direction, and are symmetrically arranged along the first direction.

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