Car lamp module and lens

Abstract

The invention provides a vehicle lamp module and a lens, and relates to the technical field of vehicle lamps, the vehicle lamp module comprises a light source module and the lens, the lens comprises a light incoming surface and a light outgoing surface, the light incoming surface comprises a first area and a second area, the first area is a middle area, and the second area is an edge area; the light emitting surface comprises a third area and a fourth area corresponding to the first area and the second area respectively, light beams of the light source module pass through the first area and the third area at a first incidence angle to form first light beams and pass through the second area and the fourth area at a second incidence angle to form second light beams, the first light beams are parallel light beams, and the second light beams are parallel light beams. The first incident angle is smaller than the second incident angle, the second incident angle of the second area in each position in the first direction is gradually increased, the second area and the fourth area promote the second light beam to be parallel light beams, and the emergent angles of the second light beam and the first light beam are the same, so that distortion of emergent light beams in the edge area of the lens is reduced; and the light spot quality of the lens edge area is optimized.

Description

Technical Field

[0001] The present application relates to the technical field of automobile lamps, and in particular to an automobile lamp module and a lens. Background Art

[0002] With the development of car lighting technology, the image quality requirements for the projected light spot of car lights are getting higher and higher, especially for the aberration problems such as distortion caused by large-angle edge beams in the car light beam. Traditional car light designs can no longer meet the requirements. Figure 1 As shown, a traditional headlight module is usually composed of a matrix-arranged LED light source 1, a light guide structure 2, a lens 3 and its mechanical housing 4. Based on this, from the perspective of the light spot projected by a single LED, the light spot formed by the edge LED has poor imaging quality compared to the light spot formed by the center LED, which is manifested in larger size, large edge distortion, low and unconcentrated energy. From the perspective of the overall projected light pattern, that is, multiple LED light spots are connected into a strip-like pattern, the center part has high and concentrated energy, the edge energy is dispersed and the edge is warped, and the boundary clarity is low. Summary of the Invention

[0003] In view of this, the present application provides a headlight module and lens that can reduce the distortion of the outgoing light beam in the edge area of the lens, optimize the quality of the projected light spot in the edge area of the lens, and thus optimize the lighting effect of the headlight module. The solution is as follows:

[0004] A vehicle light module, comprising:

[0005] A light source module, the light source module comprising at least a light source;

[0006] a lens located on the light-emitting side of the light source module, comprising a light-entering surface and a light-emitting surface; the light-entering surface comprising a first region and a second region, the first region being a middle region of the light-entering surface, the second region being an edge region excluding the middle region and being connected to the first region; the radius of curvature of the first region being infinite, and the radius of curvature of the second region being smaller than the radius of curvature of the first region and being a first preset value;

[0007] The light emitting surface includes a third area and a fourth area corresponding to the first area and the second area respectively, the curvature radius of the third area is a second preset value, the curvature radius of the fourth area is a third preset value, and the third preset value is greater than the second preset value;

[0008] The light beam emitted by the light source forms a first light beam through the first area and the third area at a first incident angle, and forms a second light beam through the second area and the fourth area at a second incident angle; the first light beam is a parallel light beam, and the second light beam is a parallel light beam, and constitutes an illumination light beam of the vehicle lamp module;

[0009] The first incident angle is smaller than the second incident angle, and the second incident angle at each location along the first direction in the second region gradually increases. The second region and the fourth region cause the second light beam to be a parallel light beam, and cause the second light beam to have the same beam angle as the first light beam.

[0010] The first direction is a direction from the first area to the second area.

[0011] Optionally, the second area includes a fifth area and a sixth area, and the fifth area and the sixth area are respectively located on two opposite sides of the first area;

[0012] The fourth area includes a seventh area and an eighth area, the seventh area corresponds to the fifth area, and the seventh area corresponds to the sixth area.

[0013] Optionally, the light incident surface is a rotationally symmetric curved surface, the center of the light incident surface coincides with the center of the first region, the curvature radius of each portion of the first region is the same, the curvature radius of each portion of the fifth region is the same, and the curvature radius of each portion of the sixth region is the same;

[0014] The light emitting surface is a rotationally symmetrical surface, the center of the light emitting surface coincides with the center of the third region, the curvature radius of each portion of the third region is the same, the curvature radius of each portion of the seventh region is the same, and the curvature radius of each portion of the eighth region is the same.

[0015] Optionally, the lens has negative optical power, and the light incident surface is a convex surface convex outwardly, and the light exit surface is a convex surface convex outwardly.

[0016] Optionally, the fifth region includes a plurality of first sub-regions arranged along the first direction, the second incident angles of the first sub-regions in the plurality of first sub-regions are different, and the second incident angles at all locations in the first sub-regions are the same;

[0017] The seventh area includes a plurality of second sub-areas arranged along the first direction, and the second sub-areas correspond to the first sub-areas one by one;

[0018] The sag of the first sub-region is a fourth preset value, and the sag of the second sub-region is a fifth preset value, so as to ensure that the optical paths of the light beams passing through the first sub-region and the second sub-region in the light beam emitted by the light source are the same, and the beam angle of the second light beam is the same as the beam angle of the first light beam;

[0019] The optical path of the light beam emitted by the light source and passing through the first sub-region and the second sub-region is the optical path from the light source module through the first sub-region and the second sub-region in sequence, the first sagittal height is the distance between the first sub-region and the cross-section of the lens along the second direction, and the second sagittal height is the distance between the second sub-region and the cross-section of the lens along the second direction; wherein the cross-section of the lens is perpendicular to the optical axis of the lens, the light incident surface and the light exit surface are respectively located on either side of the axial plane of the lens, and the second direction is parallel to the optical axis of the lens;

[0020] The vector height of the first sub-region is recorded as x1, h1 is the position of each of the plurality of first sub-regions on the cross section of the lens, c1 is the reciprocal of the radius of curvature of each of the plurality of first sub-regions, k1 is the cone coefficient, P1 is the fourth-order coefficient, P2 is the sixth-order coefficient, and P3 is the eighth-order coefficient;

[0021] The vector height of the second sub-region is denoted as x2. h2 is the position of each of the multiple second sub-regions on the cross-section of the lens, c2 is the inverse of the radius of curvature of each of the multiple second sub-regions, k2 is the cone coefficient, P4 is the fourth-order coefficient, P5 is the sixth-order coefficient, and P6 is the eighth-order coefficient.

[0022] Optionally, the sagittal heights of the first sub-regions in the plurality of first sub-regions are different, and the sagittal heights of the second sub-regions in the plurality of second sub-regions are different; or

[0023] The sagittal heights of the first sub-regions are different from each other, and the sagittal heights of at least two second sub-regions in the plurality of second sub-regions are the same.

[0024] Optionally, in the first sub-area, the value range of c1 is 0≤c1≤1500, the value range of k1 is -2≤k1≤10, and the value range of P1, P2, and P3 is 1e -8 ≤P1, P2, P3≤1e 3 ;

[0025] In the second sub-area, the value range of c2 is 0≤c2≤1500, the value range of k2 is -2≤k2≤10, and the value range of P4, P5, and P6 is 1e -8 ≤P4, P5, P6≤1e 3 .

[0026] Optionally, it also includes:

[0027] an aperture, the aperture being located between the light source module and the lens;

[0028] The aperture is used to control the beam angle of the outgoing light beam of the light source transmitted to the light incident surface, so that the beam angle of the illumination light beam of the vehicle lamp module is not less than a sixth preset value.

[0029] Optionally, along the third direction, the distance between the light source module and the light emitting surface is recorded as TTL, 80 mm ≤ TTL ≤ 100 mm; wherein the third direction is parallel to the optical axis of the lens;

[0030] Along the third direction, the distance between the aperture and the light incident surface is denoted as d, 35 mm ≤ d ≤ 45 mm;

[0031] The numerical aperture of the light incident surface is denoted as NA, NA=n·sinθ, 0.28≥NA≥45mm; wherein θ is the beam angle of the outgoing light beam of the light source transmitted to the light incident surface, n is the refractive index of the lens, 1.4≤n≤1.6.

[0032] A lens, applied to a vehicle lamp module, comprises: a light incident surface and a light emitting surface;

[0033] The light incident surface includes a first area and a second area, the first area being a middle area of the light incident surface, and the second area being an edge area excluding the middle area and being connected to the first area; the curvature radius of the first area is infinite, and the curvature radius of the second area is smaller than the curvature radius of the first area and is a first preset value;

[0034] The light emitting surface includes a third area and a fourth area corresponding to the first area and the second area respectively, the curvature radius of the third area is a second preset value, the curvature radius of the fourth area is a third preset value, and the third preset value is greater than the second preset value;

[0035] The light beam emitted by the light source of the vehicle lamp module passes through the first area and the third area at a first incident angle to form a first light beam, and passes through the second area and the fourth area at a second incident angle to form a second light beam; the first light beam and the second light beam are parallel light beams and constitute the illumination light beam of the vehicle lamp module;

[0036] The first incident angle is smaller than the second incident angle, and along the first direction, the second incident angle at each location of the second region gradually increases. The second region and the fourth region cause the second light beam to be a parallel light beam, and cause the second light beam to have the same exit angle as the first light beam.

[0037] The first direction is a direction from the first area to the second area.

[0038] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0039] The vehicle lamp module includes a light source module and a lens. The lens includes a light incident surface and a light exit surface. The light incident surface includes a first region and a second region, the first region being a middle region and the second region being an edge region. The light exit surface includes a third region and a fourth region corresponding to the first and second regions, respectively. A light beam emitted by the light source passes through the first and third regions at a first incident angle to form a first light beam, and passes through the second and fourth regions at a second incident angle to form a second light beam. The first light beam is a parallel light beam, and the second light beam is a parallel light beam. The first and second light beams constitute the illumination beam of the vehicle lamp module. The first incident angle is smaller than the second incident angle, and the second incident angle gradually increases at each location along the first direction in the second region. The second and fourth regions promote the parallelization of the second light beam, thereby reducing distortion of the second light beam and resulting in a less distorted and more concentrated light spot projected on the projection surface. Furthermore, the second and fourth regions promote the emission angle of the second light beam to be the same as the emission angle of the first light beam, thereby ensuring that the light spot projected by the second light beam on the projection surface is similar to or even identical to that of the first light beam on the projection surface. It can be seen that the car light module can reduce the distortion of the outgoing light beam in the edge area of the lens, and make the projection spot of the outgoing light beam in the edge area close to or even the same as the projection spot of the outgoing light beam in the middle area, so as to optimize the quality of the projection spot in the edge area of the lens, and then optimize the image quality of the car light module, that is, optimize the lighting effect of the car light module, so that when the car light module realizes the corresponding car light function, the projection image formed on the projection surface is kept as straight as possible at all places, which greatly improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0041] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0042] Figure 1 This is a structural diagram of an existing vehicle light module;

[0043] Figure 2 for Figure 1The light transmission diagram of the vehicle light module shown;

[0044] Figure 3 A schematic structural diagram of a vehicle light module provided in this application;

[0045] Figure 4 A comparison diagram of the light spots of the vehicle light module of the present application and the existing vehicle light module;

[0046] Figure 5 A schematic diagram of the lens structure of a headlight module provided in this application;

[0047] Figure 6 A schematic diagram of the lens structure of another vehicle light module provided in this application;

[0048] Figure 7 A comparison diagram of light transmission between the vehicle light module of the present application and the existing vehicle light module;

[0049] Figure 8 It is a schematic diagram of the arrow height distribution curve;

[0050] Figure 9 is the sagittal height distribution curve of the light incident surface and the light exit surface;

[0051] Figure 10 A comparison diagram of light transmission between the vehicle light module of the present application and the existing vehicle light module. DETAILED DESCRIPTION

[0052] The following will be combined with the accompanying drawings to clearly and completely describe the embodiments of this application. Obviously, the described embodiments are only embodiments of one area of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0054] As mentioned in the background technology section, traditional headlight design can no longer meet the requirements. Figure 2 As shown, Figure 2Where x is the optical axis of lens 3, and h is the cross-sectional direction of lens 3. In conventional headlight modules, lens 3 typically has a conventional spherical design. For example, the light-entry surface 31 of the lens is an approximately flat surface with infinite curvature, while the light-exit surface 32 is a curved surface with a certain radius of curvature that completely conforms to the spherical formula. When the light beam passes through the center of lens 3, it emerges as parallel light. When the light beam passes through the edge of lens 3, the surface distribution of light-exit surface 32 conforms to the spherical formula, resulting in the same curvature radius distribution characteristics for the large field of view at the edge and the small field of view at the center. Furthermore, since the large field of view at the edge of light-exit surface 32 does not correct the light beam as well as the small field of view at the center, the projected spot of the light beam will experience shape distortion and energy diffusion when passing through the edge.

[0055] To this end, repeated experiments are usually conducted to adjust the curvature of the light-guiding structure 2 to match the lens 3 in order to correct the quality of the projection spot of the edge light beam. However, this can only optimize the projection spot quality to a small extent, and the imaging of the center LED and the edge LEDs will still be inconsistent on the distant detection screen.

[0056] Based on the above, this application provides a vehicle light module, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of a vehicle light module provided in this application, which includes:

[0057] The light source module 100 at least includes a light source, which may be an LED light source.

[0058] The lens 200 is located on the light-emitting side of the light source module 100, that is, the lens 200 is located on the light-emitting side of the light source in the light source module 100. The lens 200 includes a light-incident surface 210 and a light-emitting surface 220. Generally, the light-incident surface 210 and the light-emitting surface 220 can be two opposite surfaces of the lens 200.

[0059] The light incident surface 210 includes a first region 211 and a second region 212. The first region 211 is the middle region of the light incident surface 210, and the second region 212 is the edge region of the light incident surface 210 excluding the middle region, and the second region 212 is connected to the first region 211. The radius of curvature of the first region 211 is infinite, that is, the middle region of the light incident surface 210 of the lens 200 can be a surface with an infinite radius of curvature, that is, the first region 211 (the middle region of the light incident surface 210) can be a plane or a plane approximation. The radius of curvature of the second region 212 is smaller than the radius of curvature of the first region 211, and the radius of curvature of the second region 212 is a first preset value, so that the second region 212 has a stronger focusing ability for the light beam transmitted therethrough than the first region 211.

[0060] The light-emitting surface 220 includes a third area 221 and a fourth area 222 corresponding to the first area 211 and the second area respectively, wherein the curvature radius of the third area 221 is a second preset value, and the curvature radius of the fourth area 222 is a third preset value, and the third preset value is greater than the second preset value, so that the fourth area 222 has a certain divergence ability for the light beam transmitted through it relative to the third area 221.

[0061] The light beam emitted by the light source passes through the first region 211 and the third region 221 at a first incident angle to form a first light beam. The light beam emitted by the light source passes through the second region 212 and the fourth region 222 at a second incident angle to form a second light beam. In other words, the portion of the light beam emitted by the light source corresponding to the first region 211 is transmitted through the first region 211 and the third region 221 in sequence and is emitted from the third region 221 to form the first light beam. The portion of the light beam emitted by the light source corresponding to the second region 212 is transmitted through the second region 211 and the fourth region 222 in sequence and is emitted from the fourth region 222 to form the second light beam. The first light beam is a parallel light beam, the second light beam is a parallel light beam, and the first and second light beams constitute the illumination light beam of the vehicle lamp module. It should be noted that the first region 211 may be the middle region of the light incident surface 210, and the second region 212 may be the edge region of the light incident surface 210. Correspondingly, the third region 221 may be the middle region of the light exit surface 220, and the fourth region 222 may be the edge region of the light exit surface 220. Thus, the portion of the light beam emitted by the light source corresponding to the first region 211 may pass through the middle region of the light incident surface 210 (i.e., the first region 211) and the middle region of the light exit surface 220 (i.e., the third region 221) to form a fourth light beam. In other words, a portion of the light beam emitted by the light source may pass through the middle region of the lens 200 to form a fourth light beam. Furthermore, due to the structure of the lens 200 itself, the middle region of the lens 200 corrects the light beam transmitted therethrough to a greater degree than the edge region. Therefore, the light beam emitted by the light source passes through the middle region of the lens 200 to form a fourth light beam. The fourth light beam may be a parallel light beam with minimal distortion and concentrated energy, resulting in a better image quality of the projected light spot. It should also be noted that the fourth light beam being a parallel light beam means that the fourth light beam is a parallel light beam with a certain beam angle. The beam angle of the fourth light beam is the angle between the beam edge and the beam center when the fourth light beam is emitted, which depends on the beam angle of the LED light source. The beam angle of the LED light source can generally be regarded as ±60°, that is, the angle range in which most of the energy is concentrated.

[0062] The first incident angle is smaller than the second incident angle, and the second incident angle at each location along the first direction in the second region 212 gradually increases. The second region 212 and the fourth region 222 cause the second light beam to be a parallel light beam, and cause the exit angle of the second light beam to be the same as the exit angle of the first light beam. It should be noted that the second region 212 is an edge region located on one side of the first region 211, so that the incident angle of the second light beam through the second region 212 is greater than the incident angle of the first light beam through the first region 211, and the closer the region in the second region 212 is to the edge of the lens 200, the greater the incident angle of the second light beam. It should also be noted that the first direction is the direction from the first region 211 to the second region 212 in the light incident surface 210, that is, the first direction can be the direction from the middle region to the edge region in the light incident surface 210.

[0063] As can be seen from the above, the lens 200 includes a middle region and an edge region. The middle region includes a first region 211 and a third region 221 that are opposite to each other, and the edge region includes a second region 212 and a fourth region 222 that are opposite to each other. The second region 212 and the fourth region 222 can cause the second light beam to be parallel and have the same beam angle (also known as the light exit angle) as the first light beam. That is, the second region 212 and the fourth region 222 can reduce the distortion of the second light beam, so that the projection spot of the second light beam on the projection surface has less distortion and more concentrated energy. Furthermore, the second light beam is parallel and has the same beam angle as the first light beam. That is, the second region 212 and the fourth region 222 can cause the projection spot of the second light beam on the projection surface to have less distortion and more concentrated energy. Furthermore, the projection spot of the second light beam on the projection surface is similar to or even identical to the projection spot of the first light beam on the projection surface. It should be noted that the projection surface can be the surface where the illumination area of the vehicle lamp module is located, or it can be a detection screen used to detect the image quality of each of the projection spots. This is not limited in this application and will depend on the specific circumstances.

[0064] In addition, the curvature radius of the second area 212 is smaller than the curvature radius of the first area 211, so that the second area 222 has a stronger convergence ability for the light beam transmitted through it relative to the first area 211, and the curvature radius of the fourth area 222 is smaller than the curvature radius of the third area 221, so that the fourth area 222 has a certain divergence ability for the light beam transmitted through it relative to the third area 221. That is to say, the second area 212 can converge the light beam transmitted through it to improve the imaging quality of the edge area of the lens 200, while the fourth area 222 can also diverge the second light beam to a certain extent to ensure the exit angle of the exit light beam, thereby ensuring the lighting range of the headlight module.

[0065] In summary, compared with the prior art, the car light module provided by the present application can reduce the distortion of the outgoing light beam in the edge area of the lens 200, and make the projection spot of the outgoing light beam in the edge area similar to or even the same as the projection spot of the outgoing light beam in the middle area. In other words, the car light module can optimize the quality of the projection spot in the edge area of the lens 200, and then optimize the image quality of the car light module, and then optimize the lighting effect of the car light module, so that when the car light module realizes the corresponding car light function, the projection image formed on the projection surface is kept as straight as possible at all places, which greatly improves the user experience.

[0066] For example Figure 4 As shown, Figure 4 a represents the above Figure 2 The diagram of the projection spot of a conventional headlight module is shown in FIG. b represents a diagram of the projection spot of a headlight module provided by the present application. From left to right in a, the projection spot of the light beam of the lens 3 passing through the edge area on one side of the middle area, the projection spot of the light beam passing through the middle area, and the projection spot of the light beam passing through the edge area on the other side of the middle area are shown. From left to right in b, the projection spot of the second light beam formed by the second area 212 on one side of the first area 211, the projection spot of the first light beam formed by the first area 211, and the projection spot of the second light beam formed by the second area 212 on the other side of the first area 211 are shown. According to Figure 4 It can be seen that the distortion of the projection spot of the outgoing light beam in the edge area of the car light module provided by the present application is small and the energy is concentrated, and the projection spot of the outgoing light beam formed in the edge area is similar to or even the same as the projection spot of the outgoing light beam formed in the middle area, which can reduce the distortion of the outgoing light beam in the edge area of the lens 200, and make the projection spot of the outgoing light beam in the edge area similar to or even the same as the projection spot of the outgoing light beam in the middle area, so that the car light module can optimize the quality of the projection spot in the edge area of the lens 200, and then optimize the image quality of the car light module, greatly improving the user experience.

[0067] It should be noted that, in the present application, the light source module 100 may include one LED light source or multiple LED light sources. When the light source module includes one LED light source, the LED light source corresponds to the center of the light incident surface 210 of the lens 200. When the light source module 100 includes multiple LED light sources, the multiple LED light sources may be arranged along a certain direction, and the multiple LED light sources are symmetrically distributed relative to the center of the light incident surface 210 of the lens 200, and the arrangement direction passes through the center of the light incident surface 210 of the lens 200, or they may be arranged in an array, and the array is also symmetrically distributed relative to the center of the light incident surface 210 of the lens 200, and the center of the array corresponds to the center of the light incident surface 210 of the lens 200.

[0068] In one embodiment of the present application, Figure 5 As shown, Figure 5 2 is a front view of the lens 200 , in which the second region 212 includes a fifth region 213 and a sixth region 214 . The fifth region 213 and the sixth region 214 are located on opposite sides of the first region 211 .

[0069] The fourth area 222 includes a seventh area 223 and an eighth area 224 . The seventh area 223 corresponds to the fifth area 213 , and the eighth area 224 corresponds to the sixth area 214 .

[0070] In another embodiment of the present application, Figure 6 As shown, Figure 6 2 is a front view of the lens 200 , in which the second region 212 is a whole and surrounds the first region 211 .

[0071] It should be noted that the above Figure 5 and Figure 6 The lens 200 shown is only an illustration of the lens 200 in the headlight module provided in the present application, and is not a limitation on the structure of the lens 200. The lens 200 of the headlight module of the present application may also have a structure other than the above, depending on the specific situation.

[0072] In one embodiment of the present application, Figure 5 As shown, the light incident surface 210 may be a rotationally symmetric curved surface, with the center of the light incident surface 210 coinciding with the center of the first region 211. The first region 211 has the same radius of curvature at all locations, the fifth region 213 has the same radius of curvature at all locations, and the sixth region 214 has the same radius of curvature at all locations. It should be noted that, based on the fact that the radius of curvature at all locations in the fifth region 213 and the radius of curvature at all locations in the sixth region 214 are the same, the radius of curvature of the fifth region 213 may be equal to the radius of curvature of the sixth region 214.

[0073] Accordingly, the light-emitting surface 220 may also be a rotationally symmetric curved surface, with the center of the light-emitting surface 220 coinciding with the center of the third region 221. The third region 221 has the same radius of curvature, the seventh region 223 has the same radius of curvature, and the eighth region 224 has the same radius of curvature. Similarly, the radius of curvature of the seventh region 223 may be equal to the radius of curvature of the eighth region 224.

[0074] From the above, it can be seen that the curvature radius of the middle area of the light incident surface 210 and the light exit surface 220 of the lens 200 is the same, and the curvature radius of the edge areas on both sides is also the same, which can simplify the shape of the lens 200 and further simplify the shape of the headlight module, thereby simplifying the production of the headlight module.

[0075] In one embodiment of the present application, the lens 200 has a negative optical power, which enables the lens 200 to have a certain divergence ability for the light beam, thereby ensuring the illumination range of the vehicle light module. The light entrance surface 210 can be a convex surface that protrudes outward, and the light exit surface 220 can be a convex surface that protrudes outward, but this application does not limit this. The light entrance surface 210 can also be a flat surface or a concave surface, depending on the specific situation.

[0076] In one embodiment of the present application, the fifth region 213 may include multiple first sub-regions, the multiple first sub-regions are arranged along the first direction, and the second incident angles of each first sub-region in the multiple first sub-regions are different, and the second incident angles at each location in the first sub-region are the same, that is, the second incident angles of the emitted light beam from the light source are different when it is incident on each first sub-region in the multiple first sub-regions, but for a single first sub-region, the second incident angles at each location are the same.

[0077] Correspondingly, the seventh region 223 may include multiple second sub-regions, and the multiple second sub-regions correspond one-to-one to the multiple first sub-regions, that is, the part of the emission light beam of the light source that is incident through the first sub-region is emitted through the corresponding second sub-region to form a second light beam.

[0078] Among them, the vector height of the first sub-region is the fourth preset value, and the vector height of the second sub-region is the fifth preset value, so as to make the optical paths of the light beams in the emission light beam of the light source passing through the first sub-region and the second sub-region the same, and make the beam angle of the second light beam the same as the beam angle of the first light beam, that is, make the optical paths of the light beams in the emission light beam of the light source incident through the second region 212 at different incident angles all the same, and the beam angle of the second light beam formed through the second region 212 and the fourth region 222 is the same as the beam angle of the first light beam. The optical paths of the light beam emitted by the light source through the first sub-region and the second sub-region are the optical paths experienced by the light beam emitted by the light source starting from the light source module 100, emitted from the light source module 100, and passing through the first sub-region and the second sub-region in sequence, so that the optical paths of the light beams in the emission light beam of the light source incident through the second region 212 at different incident angles are the same, the second light beam incident through the second region 212 at different incident angles can be made into a parallel light beam when it emerges from the fourth region 222, that is, the emergent light beam through the edge region of the lens 200 is a parallel light beam, thereby making the second light beam into a parallel light beam. As Figure 7 As shown, Figure 7 The dotted line represents the traditional headlight module, the solid line represents the headlight module of the present application, beam 1 is the lighting beam of the headlight module provided by the present application, and beam 2 is the lighting beam of the traditional headlight module. Figure 2As can be seen, the traditional headlight module's lens has a spherical light-emitting surface. This prevents the light beam from incident at large angles from the lens edge from being nearly parallel, resulting in a significant difference between the projected light spot at the edge and the center of the detection screen. However, the present invention utilizes an optimized aspheric surface design, resulting in a nearly parallel light beam that is nearly parallel to the central light beam, producing similar light spot image quality.

[0079] The first sagittal height is the distance between the first sub-region and the cross section of the lens 200 along the second direction, and the second sagittal height is the distance between the second sub-region and the cross section of the lens 200 along the second direction. The cross section of the lens 200 is perpendicular to the optical axis of the lens 200, and the light incident surface 210 and the light exit surface 220 are respectively located on both sides of the axial plane of the lens 200. The second direction is parallel to the optical axis of the lens 200.

[0080] The vector height of the first sub-region is recorded as x1, h1 is the position of each of the multiple first sub-regions on the cross section of the lens 200, c1 is the reciprocal of the radius of curvature of each of the multiple first sub-regions, k1 is the cone coefficient, P1 is the fourth-order coefficient, P2 is the sixth-order coefficient, and P3 is the eighth-order coefficient.

[0081] The vector height of the second sub-region is recorded as x2, h2 is the position of each of the multiple second sub-regions on the cross section of the lens 200, c2 is the reciprocal of the radius of curvature of each of the multiple second sub-regions, k2 is the cone coefficient, P4 is the fourth-order coefficient, P5 is the sixth-order coefficient, and P6 is the eighth-order coefficient.

[0082] Based on the above, for the second region 212 and the fourth region 222, on the premise of keeping the same curvature everywhere in the second region 212 and keeping the same curvature everywhere in the fourth region 222, high-order power terms are introduced for the vector height of each first sub-region and the corresponding second sub-region. Since the edge area of the lens 200 is a large-angle incident area with a larger incident angle of the light beam, and as the incident angle increases, the aberration will also increase rapidly, that is, the transmission error of the incident light beam in the edge area of the lens 200 increases faster than that in the central area of the lens 200. The present application introduces a high-order power term for the vector height of the edge area of the lens 200, which is equivalent to customizing the vector height for the edge area with different incident angles, and the slope of the vector height can change rapidly with the changing trend of the incident angle, so that the optical path of the incident light beam at different incident angles in the edge area of the lens 200 is the same, and the error of the incident light beam in the edge area of the lens 200 is corrected, so that the incident light beam in the edge area of the lens 200 and the incident light beam in the central area are emitted with the same error, so that the projection spot of the output light beam in the edge area is close to or even the same as the projection spot of the output light beam in the middle area, so as to optimize the quality of the projection spot of the edge area of the lens 200, and then optimize the image quality of the headlight module, greatly improving the user experience.

[0083] Based on the above, the design and implementation process of the edge area of the lens 200 can be as follows: first, the light incident surface 210 can be divided into three equal parts, corresponding to the first area 211, the fifth area 213 and the sixth area 214 respectively. The light exit surface 220 can also be divided into three equal parts, corresponding to the third area 221, the seventh area 223 and the eighth area 224 respectively. The first area 211 is a plane or an approximate plane with infinite curvature. The curvature radius of the third area 221 is R=(1+q)·R0, the absolute value of q is less than 0.2, and R0 is as follows Figure 2 The curvature radius of the light emitting surface 32 of the lens 3 in the conventional vehicle lamp module is shown.

[0084] For the edge region of the lens 200, the fifth region 213, and the seventh region 223, during the design process, either the fifth region 213 or the seventh region 223 can be used as the first step in the design. That is, the design of the edge region of the lens 200 can be carried out based on the incident light beam or the outgoing light beam. For example, when designing based on the outgoing light beam, the expected exit angle of the second light beam can be calculated based on the expected exit direction of the second light beam, thereby obtaining the expected incident angle of the light beam emitted by the light source entering the fifth region 213. When incident at this expected angle, a tangent line is drawn at the intersection of the light beam emitted by the light source and the fifth region 213. Starting from the side of the fifth region 213 near the center of the light incident surface 210 of the lens 200, n (for example, n=4) tangent lines are selected in the region near the center of the lens 200 to form the initial sagittal height distribution curve of the fifth region 213. The sagittal height distribution curve of the area near the center of the lens 200 in the fifth region 213 after fitting is obtained according to the calculation formula of the first sagittal height, as shown in FIG. Figure 8 As shown. Afterwards, n tangent lines are taken in the direction of the edge in the fifth region 213, and the previous step is repeated to finally obtain the sagitta distribution curve of the fifth region 213. It should be noted that in the process of obtaining the sagitta distribution curve of the fifth region 213, when the deviation of the fitted curve is too large, a higher-order power term can be added to the calculation formula of the first sagitta to make the obtained sagitta distribution curve closer to the desired sagitta distribution. It should also be noted that in the process of gradually increasing the incident angle and superimposing higher-order power terms, it may be necessary to make slight adjustments to the curvature radius and cone coefficient of the corresponding area. Note that the absolute value of the adjustment amplitude is less than 20% of the original value.

[0085] During the design process of the fifth region 213 and the seventh region 223, after obtaining the sagittal distribution curve of the fifth region 213, the sagittal distribution of the seventh region 223 is changed to match the sagittal distribution of the fifth region 213, so that the optical path length of the light beam emitted by the light source through each first sub-region of the fifth region 213 and the light beam transmitted from the light source module 100 through the fifth region 213 and the seventh region 223 is equal. Figure 9 As shown, Figure 9 In a, the sagittal height distribution curve of the light incident surface 210 is represented, and x in a represents the sagittal height of the light incident surface 210, and h represents the coordinate position of each point of the light incident surface 210 on the cross section of the lens 200. In b, the sagittal height distribution curve of the light emitting surface 220 is represented, and x in b represents the sagittal height of the light incident surface 210, and h represents the coordinate position of each point of the light incident surface 210 on the cross section of the lens 200.

[0086] like Figure 10 As shown, Figure 10 a in the Figure 2The light transmission diagram of the traditional car light module shown in FIG, b is a light transmission diagram of a car light module provided by the present application, according to Figure 10 It can be seen that for the traditional car light module, if the optimized light l1, l2 and l3 ( Figure 10 When parallel light (shown by the dashed line in a) is incident backward, three discrete focal points O1, O2, and O3 are generated on the centerline of the light source module. However, for the vehicle light module of this application, if the optimized parallel light beams L1, L2, and L3 are incident backward, a common focal point is generated because the second light beam is a parallel beam. Therefore, based on the principle of reversible optical paths, when designing the edge region of lens 200, either the fifth region 213 or the seventh region 223 can be used as the first step in the design.

[0087] The above content describes in detail the design principles and processes of the edge area, fifth area 213 and seventh area 223 of the lens 200, which are the same as the design principles and processes of the sixth area 214 and eighth area 223 of the lens 200 and will not be repeated here.

[0088] In one embodiment of the present application, the sagittal heights of the first sub-regions in the plurality of first sub-regions are different, and the sagittal heights of the second sub-regions in the plurality of second sub-regions are different. In another embodiment of the present application, the sagittal heights of the first sub-regions in the plurality of first sub-regions are different, and the sagittal heights of at least two second sub-regions in the plurality of second sub-regions are the same. It can be seen from this that for the vehicle light module provided by the present application, the sagittal height of the edge area of the lens 200 can be designed according to actual needs while ensuring the quality of the projected image, and the shape of the edge area of the lens 200 can be designed according to actual needs, and thus the vehicle light module has broad application prospects.

[0089] In one embodiment of the present application, in the first sub-region, the value range of c1 can be 0≤c1≤1500, the value range of k1 can be -2≤k1≤10, and the value range of P1, P2, and P3 can be 1e -8 ≤P1, P2, P3≤1e 3 .

[0090] In the second sub-area, the value range of c2 can be 0≤c2≤1500, the value range of k2 can be -2≤k2≤10, and the value range of P4, P5, and P6 can be 1e -8 ≤P4, P5, P6≤1e 3 .

[0091] In one embodiment of the present application, Figure 3 As shown, the vehicle lamp module further includes an aperture STOP, which is located between the light source module 100 and the lens 200 .

[0092] The aperture STOP is used to control the beam angle of the outgoing light beam of the light source in the light source module 100 when it is transmitted to the light incident surface 210 of the lens 200, that is, to control the beam angle of the outgoing light beam of the light source when it is transmitted to the lens 200 and incident on the light incident surface 210 of the lens 200, so that half of the beam angle of the lighting beam of the car light module is not less than the sixth preset value.

[0093] The sixth preset value is 11°, that is, the half angle HFOV of the illumination light beam of the headlight module satisfies ≥11°.

[0094] In one embodiment of the present application, along the fourth direction, the distance between the light source module 100 and the light emitting surface 220 is recorded as TTL, 80 mm ≤ TTL ≤ 100 mm, and the third direction is parallel to the optical axis of the lens 200 .

[0095] Along the third direction, the distance between the aperture STOP and the light incident surface 210 is denoted as d, and is 35 mm ≤ d ≤ 45 mm.

[0096] The numerical aperture of the light entrance surface is recorded as NA, NA = n·sinθ, 0.28 ≥ NA ≥ 45 mm. Figure 3 As shown, θ is half of the beam angle of the outgoing light beam of the light source module 100 transmitted to the light incident surface 210 , and n is the refractive index of the lens 200 , where 1.4≤n≤1.6.

[0097] The present application also provides a lens, which is applied to a vehicle lamp module, such as Figure 3 As shown, the lens 200 includes a light incident surface 210 and a light emitting surface 220 .

[0098] The light incident surface 210 includes a first region 211 and a second region 212. The first region 211 is the middle region of the light incident surface 210, and the second region 212 is the edge region of the light incident surface 210 excluding the middle region, and the second region 212 is connected to the first region 211. The radius of curvature of the first region 211 is infinite, that is, the middle region of the light incident surface 210 of the lens 200 can be a surface with an infinite radius of curvature, that is, the first region 211 (the middle region of the light incident surface 210) can be a plane or a plane approximation. The radius of curvature of the second region 212 is smaller than the radius of curvature of the first region 211, and the radius of curvature of the second region 212 is a first preset value, so that the second region 212 has a stronger focusing ability for the light beam transmitted therethrough than the first region 211.

[0099] The light-emitting surface 220 includes a third area 221 and a fourth area 222 corresponding to the first area 211 and the second area respectively, wherein the curvature radius of the third area 221 is a second preset value, and the curvature radius of the fourth area 222 is a third preset value, and the third preset value is greater than the second preset value, so that the fourth area 222 has a certain divergence ability for the light beam transmitted through it relative to the third area 221.

[0100] The light beam emitted by the light source in the light source module of the vehicle lamp module passes through the first region 211 and the third region 221 at a first incident angle to form a first light beam, and the light beam emitted by the light source passes through the second region 212 and the fourth region 222 at a second incident angle to form a second light beam. The first light beam is a parallel light beam, the second light beam is a parallel light beam, and the first and second light beams constitute the illumination beam of the vehicle lamp module.

[0101] The first incident angle is smaller than the second incident angle, and the second incident angle at each location along the first direction in the second region 212 gradually increases. The second region 212 and the fourth region 222 cause the second light beam to be a parallel light beam, and cause the exit angle of the second light beam to be the same as the exit angle of the first light beam.

[0102] As can be seen from the above, the lens 200 includes a middle area and an edge area, the middle area includes a first area 211 and a third area 221 that are opposite to each other, and the edge area includes a second area 212 and a fourth area 222 that are opposite to each other. The second area 212 and the fourth area 222 can cause the second light beam to be a parallel light beam and cause the beam angle (also known as the light exit angle) of the second light beam to be the same as that of the first light beam. That is, the second area 212 and the fourth area 222 can reduce the distortion of the second light beam, so that the projection spot of the second light beam on the projection surface has small distortion and concentrated energy, and cause the second light beam to be parallel light and have the same beam angle as that of the first light beam. That is, the second area 212 and the fourth area 222 can cause the projection spot of the second light beam on the projection surface to be small distortion and concentrated energy, and cause the projection spot of the second light beam on the projection surface to be similar to or even the same as the projection spot of the first light beam on the projection surface.

[0103] In addition, the curvature radius of the second area 212 is smaller than the curvature radius of the first area 211, so that the second area 222 has a stronger convergence ability for the light beam transmitted through it relative to the first area 211, and the curvature radius of the fourth area 222 is smaller than the curvature radius of the third area 221, so that the fourth area 222 has a certain divergence ability for the light beam transmitted through it relative to the third area 221. That is to say, the second area 212 can converge the light beam transmitted through it to improve the imaging quality of the edge area of the lens 200, while the fourth area 222 can also diverge the second light beam to a certain extent to ensure the exit angle of the exit light beam, thereby ensuring the lighting range of the headlight module.

[0104] From the above, it can be seen that the lens 200 can reduce the distortion of the outgoing light beam in the edge area of the lens 200, and make the projection spot of the outgoing light beam in the edge area close to or even the same as the projection spot of the outgoing light beam in the middle area, thereby optimizing the quality of the projection spot in the edge area of the lens 200, improving the image quality of the car light module, or optimizing the lighting effect of the car light module, so that when the car light module realizes the corresponding car light function, the projection image formed on the projection surface is kept as straight as possible at all places, which greatly improves the user experience.

[0105] The various embodiments in this specification are described in a progressive, parallel, or combined manner. Each embodiment focuses on the differences from other embodiments, and reference can be made to the descriptions of the embodiments for similar or identical areas. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple. For relevant details, refer to the descriptions of the methods.

[0106] It should be noted that in the description of this application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a centrally located component.

[0107] It should also be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the article or device comprising the aforementioned elements.

[0108] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle light module, characterized in that: include: A light source module, the light source module comprising at least a light source; A lens, located on the light-emitting side of the light source module, comprising a light-incident surface and a light-emitting surface; The light incident surface includes a first area and a second area, the first area being a middle area of the light incident surface, and the second area being an edge area excluding the middle area and being connected to the first area; the curvature radius of the first area is infinite, and the curvature radius of the second area is smaller than the curvature radius of the first area and is a first preset value; The light emitting surface includes a third area and a fourth area corresponding to the first area and the second area respectively, the curvature radius of the third area is a second preset value, the curvature radius of the fourth area is a third preset value, and the third preset value is greater than the second preset value; The light beam emitted by the light source forms a first light beam through the first area and the third area at a first incident angle, and forms a second light beam through the second area and the fourth area at a second incident angle; the first light beam is a parallel light beam, and the second light beam is a parallel light beam, and constitutes an illumination light beam of the vehicle lamp module; The first incident angle is smaller than the second incident angle, and the second incident angle at each location along the first direction in the second region gradually increases. The second region and the fourth region cause the second light beam to be a parallel light beam, and cause the second light beam to have the same beam angle as the first light beam. The first direction is a direction from the first area to the second area.

2. The vehicle light module according to claim 1, characterized in that: The second area includes a fifth area and a sixth area, and the fifth area and the sixth area are respectively located on opposite sides of the first area; The fourth area includes a seventh area and an eighth area, the seventh area corresponds to the fifth area, and the seventh area corresponds to the sixth area.

3. The vehicle light module according to claim 2, characterized in that: The light incident surface is a rotationally symmetrical curved surface, the center of the light incident surface coincides with the center of the first region, the curvature radius of each portion of the first region is the same, the curvature radius of each portion of the fifth region is the same, and the curvature radius of each portion of the sixth region is the same; The light emitting surface is a rotationally symmetrical curved surface, the center of the light emitting surface coincides with the center of the third region, the curvature radius of each portion of the third region is the same, and the curvature radius of each portion of the seventh region is the same; The curvature radius of each location in the eighth region is the same.

4. The vehicle light module according to claim 3, characterized in that: The lens has negative optical power, the light incident surface is a convex surface convex outward, and the light exit surface is a convex surface convex outward.

5. The vehicle light module according to claim 3, characterized in that: The fifth region includes a plurality of first sub-regions arranged along the first direction, wherein the second incident angles of the first sub-regions are different from each other, and the second incident angles at all locations in the first sub-regions are the same; The seventh area includes a plurality of second sub-areas arranged along the first direction, and the second sub-areas correspond to the first sub-areas one by one; The sag of the first sub-region is a fourth preset value, and the sag of the second sub-region is a fifth preset value, so as to ensure that the optical paths of the light beams passing through the first sub-region and the second sub-region in the light beam emitted by the light source are the same, and the beam angle of the second light beam is the same as the beam angle of the first light beam; The optical path of the light beam emitted by the light source and passing through the first sub-region and the second sub-region is the optical path from the light source module through the first sub-region and the second sub-region in sequence, the first sagittal height is the distance between the first sub-region and the cross-section of the lens along the second direction, and the second sagittal height is the distance between the second sub-region and the cross-section of the lens along the second direction; wherein the cross-section of the lens is perpendicular to the optical axis of the lens, the light incident surface and the light exit surface are respectively located on either side of the axial plane of the lens, and the second direction is parallel to the optical axis of the lens; The vector height of the first sub-region is recorded as x1, h1 is the position of each of the plurality of first sub-regions on the cross section of the lens, c1 is the reciprocal of the radius of curvature of each of the plurality of first sub-regions, k1 is the cone coefficient, P1 is the fourth-order coefficient, P2 is the sixth-order coefficient, and P3 is the eighth-order coefficient; The vector height of the second sub-region is denoted as x2. h2 is the position of each of the multiple second sub-regions on the cross-section of the lens, c2 is the inverse of the radius of curvature of each of the multiple second sub-regions, k2 is the cone coefficient, P4 is the fourth-order coefficient, P5 is the sixth-order coefficient, and P6 is the eighth-order coefficient.

6. The vehicle light module according to claim 5, characterized in that: The sagittal heights of the first sub-regions are different, and the sagittal heights of the second sub-regions are different; or The sagittal heights of the first sub-regions are different from each other, and the sagittal heights of at least two second sub-regions in the plurality of second sub-regions are the same.

7. The vehicle light module according to claim 5 or 6, characterized in that: In the first sub-region, the value range of c1 is 0≤c1≤1500, the value range of k1 is -2≤k1≤10, and the value range of P1, P2, and P3 is 1e -8 ≤P1, P2, P3≤1e 3 ; In the second sub-area, the value range of c2 is 0≤c2≤1500, the value range of k2 is -2≤k2≤10, and the value range of P4, P5, and P6 is 1e -8 ≤P4, P5, P6≤1e 3 .

8. The vehicle lamp module according to claim 1, characterized in that: Also includes: an aperture, the aperture being located between the light source module and the lens; The aperture is used to control the beam angle of the outgoing light beam of the light source transmitted to the light incident surface, so that the beam angle of the illumination light beam of the vehicle lamp module is not less than a sixth preset value.

9. The vehicle light module according to claim 9, characterized in that: Along the third direction, the distance between the light source module and the light emitting surface is recorded as TTL, 80mm≤TTL≤100mm; wherein the third direction is parallel to the optical axis of the lens; Along the third direction, the distance between the aperture and the light incident surface is denoted as d, 35 mm ≤ d ≤ 45 mm; The numerical aperture of the light incident surface is denoted as NA, NA=n·sinθ, 0.28≥NA≥45mm; wherein θ is the beam angle of the outgoing light beam of the light source transmitted to the light incident surface, n is the refractive index of the lens, 1.4≤n≤1.

6.

10. A lens, characterized in that: Applied to car light modules, including: light incident surface and light emitting surface; The light incident surface includes a first area and a second area, the first area being a middle area of the light incident surface, and the second area being an edge area excluding the middle area and being connected to the first area; the curvature radius of the first area is infinite, and the curvature radius of the second area is smaller than the curvature radius of the first area and is a first preset value; The light emitting surface includes a third area and a fourth area corresponding to the first area and the second area respectively, the curvature radius of the third area is a second preset value, the curvature radius of the fourth area is a third preset value, and the third preset value is greater than the second preset value; The light beam emitted by the light source of the vehicle lamp module passes through the first area and the third area at a first incident angle to form a first light beam, and passes through the second area and the fourth area at a second incident angle to form a second light beam; the first light beam and the second light beam are parallel light beams and constitute the illumination light beam of the vehicle lamp module; The first incident angle is smaller than the second incident angle, and along the first direction, the second incident angle at each location of the second region gradually increases. The second region and the fourth region cause the second light beam to be a parallel light beam, and cause the second light beam to have the same exit angle as the first light beam. The first direction is a direction from the first area to the second area.

Images