Foundation low-beam imaging lens and optical system

Abstract

The application provides a basic low-beam imaging lens and an optical system, comprising: a lens body, wherein an entrance surface and a multiplexed light-out convex lens surface are arranged on the lens body; the entrance surface comprises at least three entrance concave lens surfaces, the positions of the focal points formed by the at least three entrance concave lens surfaces are different, and the curvatures of the at least three entrance concave lens surfaces are different; and the focal length range of each entrance concave lens surface contains a corresponding focal point converged by the optical system. The application can avoid the use of a low-beam horizontal cutoff line light-shielding plate, can reduce the cost of a module on one hand, can reduce the length of a size chain on the other hand, and can improve the stability of the optical performance of the module.

Description

Technical Field

[0001] This invention relates to the field of automotive lighting technology, specifically to a basic low-beam imaging lens and optical system, and more particularly to a novel narrow-aperture cylindrical single lens for automobiles with a large tilt angle. Background Technology

[0002] With the rapid advancement of manufacturing technology, more and more product designs can be precisely manufactured. Imaging lenses, however, have extremely high processing requirements; even slight deformations can affect image quality and the final optical performance. But a complete product requires the assembly of numerous parts, and each assembly adds to the product system's tolerance. The cumulative tolerances from multiple assembly steps offset the improvements in manufacturing precision, ultimately impacting the product's actual optical performance.

[0003] As a highly integrated and precision-critical component in automobiles, automotive lights are particularly sensitive to the accuracy and number of parts. Meanwhile, automobiles are no longer just simple means of transportation; the increasing application of new technologies makes limited space increasingly compact and insufficient. To accommodate more functional modules, every space in a car is being fully utilized. The emergence of autonomous driving has driven the development of automotive radar. To improve space utilization, more and more radars are being integrated into the headlights, occupying space that was originally intended for lighting functions.

[0004] To mitigate these effects, current mainstream auxiliary low beam or the base low beam (wide-angle beam pattern) function within modules integrates the cut-off line shield with other components, such as the heat sink. To improve efficiency, a highly reflective aluminum layer is plated in certain areas to achieve stable performance. However, this design remains traditional, with the light source outside the focal point, making it difficult to reduce module size. The heat sink's precision cannot meet the design requirements of the cut-off line shield, inevitably leading to significant differences in the optical performance of the actual components, and the optical performance failing to fully meet design requirements. Therefore, inventing a basic low beam imaging lens has become an urgent problem to solve. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of this invention is to provide a basic near-light imaging lens and optical system.

[0006] According to the present invention, a basic near-light imaging lens includes: a lens body, wherein the lens body is provided with an incident light surface and a multiplexed exit light convex lens surface;

[0007] The light-incident surface includes at least three light-incident concave lens surfaces, the focal points formed by the at least three light-incident concave lens surfaces are at different positions, and the curvatures of the at least three light-incident concave lens surfaces are different.

[0008] The focal length range of each of the aforementioned incident concave lens surfaces includes the focal point that the optical system in which it is located converges.

[0009] Preferably, the multiplexed output convex lens surface is a continuous surface.

[0010] Preferably, the multiplexed light-emitting convex lens surface is a cylindrical optical surface.

[0011] Preferably, there are at least three incident concave lens surfaces, and two adjacent incident concave lens surfaces are discontinuous.

[0012] Preferably, the incident concave lens surfaces are all base incident surfaces.

[0013] Preferably, the light-incident concave lens surface is configured as three, and the three light-incident concave lens surfaces are respectively a first base light-incident surface, a second base light-incident surface and a third base light-incident surface;

[0014] The focal points of the first base incident surface, the second base incident surface, and the third base incident surface are at different positions.

[0015] Preferably, the lens body is made of any one of the following materials: polycarbonate, polymethyl methacrylate, or glass.

[0016] Preferably, the optical system is any one of the following: a single light source system, a reflective optical system, a direct optical system, or a projection optical system.

[0017] The present invention also provides an optical system including the aforementioned basic near-light imaging lens.

[0018] Preferably, it also includes a reflector bowl, which includes a first cavity, a second cavity, and a third cavity;

[0019] The first cavity is configured corresponding to the first light-incident surface, the second cavity is configured corresponding to the second light-incident surface, and the third cavity is configured corresponding to the third light-incident surface.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The basic near beam imaging lens of the present invention adopts the design concept of imaging optics, taking the boundary of the image formed by the convergence of light as the horizontal cutoff line light pattern of the basic near beam, and projecting it onto the ground through the lens. This can avoid the use of the near beam horizontal cutoff line light shield, which can reduce the cost of the module on the one hand, and also reduce the length of the dimension chain on the other hand, and improve the stability of the module's optical performance.

[0022] 2. This invention divides the light-incident surface of the lens body into three concave lens surfaces with different upper and lower focal positions. The image boundary will also be refracted to different design positions to form a bathtub-shaped auxiliary low beam pattern. The design of the bathtub beam pattern fully meets the requirements of vehicle lighting regulations and C-NCAP rating, thereby helping to improve the vehicle's rating.

[0023] 3. Compared with traditional convex lenses, this invention designs the focal point of the optical system to be inside the focal length on the inner surface of the lens, rather than at the focal point. This can greatly reduce the front and rear dimensions of the system and save space for the module inside the headlight.

[0024] 4. Each light-incident surface of the present invention can be designed into different shapes according to different design requirements, and finally combined on the inner surface of the same lens, while the outer surface is the same cylindrical surface, thereby ensuring the consistency of the outer surface, improving the overall appearance of the module, and meeting the market's design requirements. Attached Figure Description

[0025] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the paraxial optical imaging principle.

[0027] Figure 2 This is a schematic diagram illustrating the design principle of the basic near-light imaging lens of this invention.

[0028] Figure 3 This is a simulated light pattern diagram of a single LED before and after lens diffusion according to the present invention;

[0029] Figure 4 This is a comparative schematic diagram showing the effect of the lens diffusion angle on the present invention;

[0030] Figure 5 This is a simulated light pattern diagram illustrating the effect of the lens diffusion angle on the light pattern of the present invention.

[0031] Figure 6 This is a schematic diagram of the imaging at different focal length positions of the lens of the present invention;

[0032] Figure 7 This is a rear view of the lens of the present invention and a cross-sectional view along lines AA, BB, and CC.

[0033] Figure 8 This is a schematic diagram of the optical system of the present invention;

[0034] Figure 9 for Figure 8 A simulated bathtub light pattern diagram of the optical system;

[0035] Figure 10 This is a structural diagram of the basic near-light imaging lens of the present invention.

[0036] The diagram shows:

[0037] Lens body 1, Reflecting bowl 2

[0038] First light-receiving surface 101 First cavity 201

[0039] Second light-receiving surface 102 Second cavity 202

[0040] Third light-receiving surface 103, Third cavity 203

[0041] Reuse of the 104 glossy surface Detailed Implementation

[0042] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0043] Example 1:

[0044] like Figures 1-10 As shown, this embodiment provides a basic near-light imaging lens, including: a lens body 1, on which an incident light surface and a multiplexed exiting light convex lens surface 104 are provided. The incident light surface includes at least three incident light concave lens surfaces, the positions of the focal points formed by the at least three incident light concave lens surfaces are different, the curvatures of the at least three incident light concave lens surfaces are different, and the focal length range of each incident light concave lens surface includes the focal point converged by the optical system to which it belongs, that is, the focal point converged by the optical system to each incident light concave lens surface is located within the focal length of each incident light concave lens surface.

[0045] The lens body 1 is made of any of the following materials: polycarbonate, polymethyl methacrylate, or glass. The optical system is any of the following: a single light source system, a reflective optical system, a direct optical system, or a projection optical system.

[0046] The multiplexed output convex lens surface 104 is a continuous surface. The multiplexed output convex lens surface 104 is a cylindrical optical surface. There are at least three incident concave lens surfaces, and adjacent incident concave lens surfaces are discontinuous surfaces.

[0047] All light-incident concave lens surfaces are base light-incident surfaces. There are three light-incident concave lens surfaces: a first base light-incident surface 101, a second base light-incident surface 102, and a third base light-incident surface 103. The focal points of the first base light-incident surface 101, the second base light-incident surface 102, and the third base light-incident surface 103 are located at different positions.

[0048] This embodiment also provides an optical system, including the basic near-light imaging lens described above.

[0049] The optical system of this embodiment also includes a reflector bowl 2, which includes a first cavity 201, a second cavity 202, and a third cavity 203. The first cavity 201 is disposed corresponding to the first light-incident surface 101, the second cavity 202 is disposed corresponding to the second light-incident surface 102, and the third cavity 203 is disposed corresponding to the third light-incident surface 103.

[0050] The basic near-light imaging lens in this embodiment adopts the design concept of imaging optics: in the horizontal direction, the inner surface is magnified and widened by the lateral diffusion of the curvature of a specially designed concave lens, and then magnified into an inverted image by the convex lens on the outer surface of the lens and projected onto the road surface; in the vertical direction, three or more separate concave lenses at different focal lengths refract the light into three images with different boundary heights, and then magnified into an inverted image by the convex lens on the outer surface of the lens and projected onto the road surface.

[0051] The basic low-beam imaging lens of this embodiment utilizes an imaging lens-designed low-beam system that avoids the need for a low-beam horizontal cutoff line light shield. This reduces module costs and shortens the dimensional chain, thereby improving the stability of the module's optical performance.

[0052] In this embodiment, the inner surface of the lens is designed to be divided into three different upper and lower focal positions. Therefore, the boundary of the image will be refracted to different design positions, forming a bathtub-shaped auxiliary low beam pattern. The design of the bathtub beam pattern fully meets the requirements of vehicle lighting regulations and C-NCAP rating, thereby helping to improve the vehicle's rating.

[0053] Example 2:

[0054] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0055] This embodiment provides an optical lens for widening the low beam at a large angle, and in particular a novel narrow-aperture automotive cylindrical single lens with a large tilt angle.

[0056] The optical lens of this embodiment comprises at least one light-incident surface and a light-exit surface 104 that performs all functions. The at least one light-incident surface includes a first light-incident surface 101, a second light-incident surface 102, and a third light-incident surface 103.

[0057] The first light-receiving surface 101 is a spot light-receiving surface, the second light-receiving surface 102 is a low beam base light-receiving surface, and the third light-receiving surface 103 is a spot light-receiving surface. The spot light-receiving surface is a spot light-receiving surface with a 45° cutoff line, the low beam base light-receiving surface is a light-receiving surface with a horizontal cutoff line, and the spot light-receiving surface is a light-receiving surface with a 45° cutoff line.

[0058] This embodiment is a thin lens with a near-light module and a tilt angle of 0 to 40°. The first light-incident surface 101 and the third light-incident surface 103 adopt a near-field optical design, while the second light-incident surface 102 adopts a far-field optical design. The different light field designs of different functional areas avoid problems such as low light efficiency and poor light pattern caused by large-angle tilting.

[0059] This embodiment employs a far-field optical design in the near-light base functional area to reduce the impact of large-angle tilting on the base widening of the near-field imaging optical system, ensuring the efficiency and uniformity of the base beam pattern. Since the light does not need to pass through a lens for imaging, only a lens with uniform wall thickness is required to achieve the optical performance. Therefore, the second light-incident surface 102 can be a curved surface identical to the composite light-out surface 104. This area is a lens with uniform wall thickness, avoiding the asymmetrical beam pattern caused by large-angle tilting, thus achieving a large-angle tilting module design to meet customer needs. Simultaneously, the second light-incident surface 102, whose position can be freely adjusted, is easier to match in terms of structural dimensions with the first light-incident surfaces 101 and the third light-incident surface 103 on both sides, reducing the light-incident surface drop caused by large-angle tilting, achieving a lens body 1 with uniform wall thickness, and reducing manufacturing difficulty.

[0060] The lens in this embodiment consists of three or more separately designed light-incident surfaces and the same light-outcident surface. The light-incident surfaces include a first light-incident surface (right side of the bathtub), a second light-incident surface (horizontal cutoff line), and a third light-incident surface (left side of the bathtub). The three parts together form the basic low beam pattern with a large-angle widening effect.

[0061] The basic low-beam lens in this embodiment adopts the design concept of imaging optics: in the horizontal direction, the inner surface is magnified and widened by the lateral diffusion of the curvature of a specially designed concave lens, and then magnified into an inverted image by the convex lens on the outer surface of the lens and projected onto the road surface; in the vertical direction, three or more separate concave lenses at different focal lengths refract the light into three images with different boundary heights, and then magnified into an inverted image by the convex lens on the outer surface of the lens and projected onto the road surface.

[0062] This embodiment utilizes an imaging lens to design a low-beam system that avoids the need for a horizontal cutoff line light shield. This reduces module costs and length of the dimension chain, thereby improving the stability of the module's optical performance.

[0063] Meanwhile, this embodiment divides the inner surface of the lens into three different upper and lower focal points. Therefore, the image boundary is refracted to different designed positions, forming a bathtub-shaped auxiliary low beam pattern. This bathtub-shaped beam pattern fully meets the requirements of automotive lighting regulations and the China Insurance Automotive Safety Index (C-IASI) rating requirements, thus helping to improve the vehicle's rating.

[0064] Compared to traditional convex lenses, this embodiment designs the focal point of the optical system to be inside the focal length on the inner surface of the lens, rather than at the focal point. This greatly reduces the front and rear dimensions of the system and saves space for the module inside the headlight.

[0065] Each light-incident surface in this embodiment is designed with a different shape due to different design requirements. They are ultimately combined on the inner surface of the same lens, while the outer surface is the same cylindrical surface, thus ensuring the consistency of the outer surface, improving the overall appearance of the module, and meeting the market's design requirements.

[0066] The basic near-light imaging lens in this embodiment reduces the size of the lens and lowers the cost.

[0067] Example 3:

[0068] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0069] This embodiment provides a novel basic near-beam imaging lens, comprising at least three light-incident surfaces and a multifunctional light-exit surface 104. The at least three light-incident surfaces include a first light-incident surface 101 (right side of the bathtub), a second light-incident surface 102, and a third light-incident surface 103 (left side of the bathtub). These three parts together form a basic near-beam beam pattern with a large-angle broadening effect. The first light-incident surface 101, the second light-incident surface 102, and the third light-incident surface 103 are all near-beam base light-incident surfaces, and the second light-incident surface 102 has a horizontal cutoff line.

[0070] The basic low-beam lens in this embodiment adopts the design concept of imaging optics, and designs the focal point of the optical system to be located at any position inside the focal length of the concave lens on the inner surface of the lens. The focal length of the lens body 1 is adjustable and variable according to the design requirements. Adjusting it forward and backward will cause a change in the size of the light pattern, and adjusting it up and down will cause a change in the position of the light pattern. This design is conducive to achieving the optimal auxiliary low-beam light pattern, and the adjustable and variable focal length improves the design diversity.

[0071] Based on the principles of geometric optics imaging:

[0072] like Figure 2 In the horizontal direction, the light rays of the optical system converge above the optical axis at L1, and then are refracted and magnified by the concave lens on the inner surface to be above the optical axis at L. Finally, they are formed into an inverted image on the 25m screen by the lens on the outer surface of the lens.

[0073] like Figure 6 In the vertical direction, concave lenses at different focal lengths at different heights can refract the same virtual object 1 converged by the optical system into images 1 and 1' at different height boundaries. These images are then magnified by convex lenses on the outer surface of the lenses to form inverted images 2 and 2' projected onto the road surface. For example... Figure 9 The three different designs ultimately formed a bathtub-shaped light pattern.

[0074] The theoretical calculations are as follows:

[0075] a. According to Figure 1 Paraxial optical imaging theory can be used to derive the formula for the focal length of a lens:

[0076] On the left side of the system, given α = H / L and α = h / (Lf),

[0077] We obtain h = H(Lf); (1)

[0078] On the right side of the system, given β=h′ / f′, β=h / (0.5d+f) and h′=h,

[0079] We obtain f′=0.5d+f; (2)

[0080] At the same time, according to β=h′ / f′, β=H′ / L′ and H′=H,

[0081] We obtain h′=Hf′ / L′; (3)

[0082] Combining the formulas (1) and (2) on the left and right sides of the system, we get 1 = f′ / L′ + f / L; (4)

[0083] Substituting formula (2) into formula (4) yields:

[0084] f=(2LL′-Ld) / 2(L+L′) (5)

[0085] f′=(2LL′+Ld) / 2(L+L′) (6)

[0086] α = H / L

[0087] b. According to Figure 2-3 The ideal optical imaging principle can be used to deduce the image size of the designed lens:

[0088] On the left side of the system, given L1 / L = H1 / H2,

[0089] Therefore, H2 = H1L / L1; (7)

[0090] On the right side of the system, O′L′ is much larger than O′f′, therefore, through H′2O=H2O and H3 / (L′-f′)=H2′ / f′,

[0091] We arrive at H3 / L′=H2 / f′,

[0092] Finally, we obtain H3 = H1LL′ / L1f′.

[0093] c. Initial design settings: L = 80mm, L' = 25000mm, d = 10mm, L1 = 24mm, H1 = 5.5mm;

[0094] Based on the formulas in a and b, we can derive and calculate the following:

[0095] f'=79.8mm, f=74.8mm, H2=8.1mm, H3=2539.0mm.

[0096] Finally, the single-sided diffusion angle of H3 on a screen with a D=25000mm² is:

[0097] θ = arctan(H3 / D) = 5.8°.

[0098] The software design uses a centered single light source and a lens with near-zero diffusion. However, considering that the lens in the software cannot be perfectly designed to have zero diffusion, the simulation results are compared with the theoretically calculated θ results. Figure 3-1 The same conclusion holds. Furthermore, practical designs will incorporate lenses with diffusion features to broaden and magnify the light pattern to approximately 14°. Figure 3-2 Three side-by-side light sources emit light in a cross pattern. Figure 8 Ultimately, this can result in a complete optical design with a left-right diffusion angle exceeding 30° or greater, shaped like a bathtub. Figure 9 .

[0099] Furthermore, the light source that converges into the virtual object can be a single light source or an optical system such as a reflective, direct, or projective system.

[0100] Furthermore, the near-light base incident surface 102 of the lens body 1 can be appropriately adjusted in terms of horizontal and vertical curvature according to design requirements to improve the broadening and uniformity of the base light pattern, while providing a variety of light pattern designs.

[0101] Furthermore, the light-emitting surface of the lens body 1 is a cylindrical optical surface, not a conventional spherical optical surface. The side-by-side arrangement of functions greatly reduces the aperture size. Moreover, it is a continuous curved surface shared by all functions. Its tilt angle, curvature, and size can be adjusted according to design requirements, thereby improving the appearance and application range of the lens.

[0102] Furthermore, the number of light-incident surfaces of the lens body 1 can be further divided or merged according to functional requirements. That is, a single light-incident surface can be further divided into at least two sub-light-incident surfaces, or at least two light-incident surfaces can be merged into one surface. The number is variable. Combined with the individual design of each light-incident surface area of ​​the lens of the present invention and integrated into one, more functions can be designed and reused beyond single functions, such as corner lights, front fog lights, etc., which will not be further listed.

[0103] Furthermore, the lens body 1 can be integrated with other modules to ultimately match and form complete low beam and high beam patterns.

[0104] Furthermore, the shape of the lens body 1 can be partially cut according to the design requirements, which improves the applicability of the lens design and increases the design possibilities.

[0105] Furthermore, the material of the lens body 1 can be polycarbonate (PC), polymethyl methacrylate (PMMA), or glass.

[0106] Example 5:

[0107] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1 and Embodiment 2.

[0108] like Figure 8 As shown, this embodiment provides an optical system comprising a lens body 1 and a reflector bowl 2. The lens body 1 includes three light-incident surfaces and a light-out surface 104 that multiplexes all functions. The at least three light-incident surfaces include a first light-incident surface 101 (right side of the bathtub), a second light-incident surface 102 (horizontal cutoff line), and a third light-incident surface 103 (left side of the bathtub). The first, second, and third light-incident surfaces are all near-light base light-incident surfaces.

[0109] The reflecting bowl 2 includes three cavities. The light from the first reflecting cavity 201 mainly passes through the first incident surface 101, forming... Figure 9 The light pattern diagram shows step 1; the light from the second reflecting cavity 202 mainly passes through the second incident surface 102, forming... Figure 9 The light pattern is shown in step 2 on the upper part of the diagram; the light rays from the third reflecting cavity 203 mainly pass through the third incident surface 103, forming... Figure 9 Step 3 on the beam pattern diagram; the three parts of the design together form the basic low beam pattern with a large-angle widening effect.

[0110] In the horizontal direction, such as Figure 2 As shown, the light rays from the optical system converge above the optical axis at L1, then are refracted and magnified by the concave lens on the inner surface to be above the optical axis at L, and finally formed into an inverted image on the 25m screen by the lens on the outer surface. Figure 7 As shown in the AA cross-sectional diagram, the inner surface is concave, which diffuses the light. The larger the diffusion angle, the more uniform the energy distribution at the cutoff line, such as... Figure 4 The three comparison diagrams shown are as follows: Figure 5 Optical simulation results also confirm this. However, while meeting the design broadening requirements, efficiency and other issues must also be considered to optimize the diffusion angle of the lens and ultimately obtain the best light pattern.

[0111] In the vertical direction, such as Figure 6 As shown, concave lenses at focal lengths at different heights can refract the same virtual object 1 converged by the optical system into images 1 and 1' at different height boundaries, corresponding to... Figure 7 The BB cross-sectional view is then magnified into an inverted image by a convex lens on the outer surface of the lens and projected onto the road surface. Image 2 and image 2' correspond to each other. Figure 7 The CC cross-section. Three different designs ultimately form a bathtub-shaped light pattern, such as... Figure 9 As shown.

[0112] To obtain a basic low beam profile with a 30-degree beam extension, a specific design can be derived through theoretical calculations and analysis.

[0113] a. According to Figure 1 Paraxial optical imaging theory can be used to derive the formula for the focal length of a lens:

[0114] On the left side of the system, given α = H / L and α = h / (Lf),

[0115] We obtain h = H(Lf); (1)

[0116] On the right side of the system, given β=h′ / f′, β=h / (0.5d+f) and h′=h,

[0117] We obtain f′=0.5d+f; (2)

[0118] At the same time, according to β=h′ / f′, β=H′ / L′ and H′=H,

[0119] We obtain h′=Hf′ / L′; (3)

[0120] Combining the left and right sides of the system (1) and (2), we get 1 = f′ / L′ + f / L; (4)

[0121] Substituting formula (2) into formula (4) yields:

[0122] f=(2LL′-Ld) / 2(L+L′) (5)

[0123] f′=(2LL′+Ld) / 2(L+L′) (6)

[0124] α = H / L

[0125] b. According to Figure 2-3 The ideal optical imaging principle can be used to deduce the image size of the designed lens:

[0126] On the left side of the system, given L1 / L = H1 / H2,

[0127] Therefore, H2 = H1L / L1; (7)

[0128] On the right side of the system, O′L′ is much larger than O′f′, therefore, through H2′O=H2O and H3 / (L′-f′)=H′2 / f′,

[0129] We arrive at H3 / L′=H2 / f′,

[0130] Finally, we obtain H3 = H1LL′ / L1f′.

[0131] c. Initial design settings: L = 80mm, L' = 25000mm, d = 10mm, L1 = 24mm, H1 = 5.5mm;

[0132] Based on the formulas in a and b, we can derive and calculate the following:

[0133] f'=79.8mm, f=74.8mm, H2=8.1mm, H3=2539.0mm.

[0134] Finally, the single-sided diffusion angle of H3 on a screen with a D=25000mm² is:

[0135] θ = arctan(H3 / D) = 5.8°.

[0136] The software design uses a centered single light source and a lens with near-zero diffusion. However, considering that the lens in the software cannot be perfectly designed to have zero diffusion, the simulation results are compared with the theoretically calculated θ result. Figure 3-1 The same conclusion. Meanwhile, practical designs will incorporate lenses with diffusion to broaden and magnify the light pattern to approximately 14°. Figure 3-2 Three side-by-side light sources emit light in a cross pattern. Figure 8 Ultimately, this can result in a complete optical design with a bathtub-shaped lateral diffusion angle exceeding 30° or greater. Figure 9 ).

[0137] The basic low-beam lens in this embodiment adopts the design concept of imaging optics, and designs the focal point of the optical system to be located at any position inside the focal length of the concave lens on the inner surface of the lens. The focal length of the lens body 1 is adjustable and variable according to the design requirements. Adjusting it forward and backward will cause a change in the size of the light pattern, and adjusting it up and down will cause a change in the position of the light pattern. This design is conducive to achieving the optimal auxiliary low-beam light pattern, and the adjustable and variable focal length improves the design diversity.

[0138] This invention avoids the use of a near-beam horizontal cutoff line light shield, which reduces module cost and length of the dimension chain, thereby improving the stability of module optical performance.

[0139] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0140] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A basic near-light imaging lens, characterized in that, include: Lens body (1), wherein the lens body (1) is provided with an incident light surface and a multiplexed exit light convex lens surface (104). The light-incident surface includes at least three light-incident concave lens surfaces, the focal points formed by the at least three light-incident concave lens surfaces are at different positions, and the curvatures of the at least three light-incident concave lens surfaces are different. The focal length range of each of the aforementioned incident concave lens surfaces includes the focal point that the optical system in which it is located converges; That is, the focal point of the optical system corresponding to each incident concave lens surface is located within the focal length of each incident concave lens surface; All light-incident concave lens surfaces are base light-incident surfaces; there are three light-incident concave lens surfaces, namely a first base light-incident surface (101), a second base light-incident surface (102), and a third base light-incident surface (103). The focal points of the first base incident surface (101), the second base incident surface (102), and the third base incident surface (103) are at different positions; The optical system can be any of the following: a single light source system, a reflective optical system, a direct optical system, or a projection optical system.

2. The basic near-light imaging lens according to claim 1, characterized in that, The multiplexed light-emitting convex lens surface (104) is a continuous surface.

3. The basic near-light imaging lens according to claim 2, characterized in that, The multiplexed light-emitting convex lens surface (104) is a cylindrical optical surface.

4. The basic near-light imaging lens according to claim 1, characterized in that, At least three incident concave lens surfaces, wherein two adjacent incident concave lens surfaces are discontinuous.

5. The basic near-light imaging lens according to claim 1, characterized in that, The lens body (1) is made of any of the following materials: polycarbonate, polymethyl methacrylate, or glass.

6. An optical system, characterized in that, Includes the basic near-light imaging lens as described in any one of claims 1 to 5.

7. The optical system according to claim 6, characterized in that, It also includes a reflector bowl (2), which includes a first cavity (201), a second cavity (202), and a third cavity (203); The first cavity (201) is set to correspond to the first base light-incident surface (101), the second cavity (202) is set to correspond to the second base light-incident surface (102), and the third cavity (203) is set to correspond to the third base light-incident surface (103).

Images