Lens module, lamp and vehicle

Abstract

The utility model discloses a lens module, lamps and lanterns and vehicle relates to lighting technical field. This lens module includes first lens, second lens and third lens that arrange in order from object side to image side along the optical axis direction, wherein, the object side surface of first lens is plane, and the image side surface of first lens is concave surface, second lens is double convex lens, and third lens is meniscus lens, and the object side surface of third lens is convex, and the image side surface of third lens is concave. The lens module of utility model embodiment is suitable for being applied to multi -pixel light source, is used for realizing far and near light illumination, and simultaneously, the simple structure of lens module is favorable to reduce overall size, reduce assembly difficulty and manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and in particular to a lens module, a lamp, and a vehicle. Background Technology

[0002] In existing technologies, to achieve the illumination and projection functions of automotive headlights, a complex lens module architecture with four or more elements and multiple pixel light sources is typically used. This four-element lens structure results in a large overall module size, making it difficult to meet the requirements of modern automobiles for lightweight and compact design. Moreover, the large number of optical components complicates the assembly process, thereby increasing manufacturing costs and production difficulties.

[0003] Therefore, how to simplify the lens structure, reduce its size, and lower its cost while ensuring good light distribution performance and image clarity has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the first aspect of the present invention aims to provide a lens module suitable for use with multi-pixel light sources to achieve both near and far beam illumination. Furthermore, the lens module has a simple structure, which helps to reduce overall size, assembly difficulty, and manufacturing costs.

[0005] The second aspect of this utility model is to provide a lamp having the above-mentioned lens module.

[0006] The objective of the third aspect of this utility model is to provide a vehicle having the aforementioned lamps.

[0007] According to an embodiment of the present invention, the lens module includes a first lens, a second lens, and a third lens arranged sequentially from the object side to the image side along the optical axis; wherein, the object side of the first lens is a plane, and the image side of the first lens is a concave surface; the second lens is a biconvex lens; the third lens is a meniscus lens, and the object side of the third lens is a convex surface, and the image side of the third lens is a concave surface.

[0008] According to the lens module of this utility model embodiment, by setting the image-side surface of the first lens to be a concave aspherical surface, aberrations are effectively corrected; the second lens is a biconvex lens, which suppresses chromatic aberration and supports a large field of view; and the third lens is a meniscus lens, which optimizes the optical power distribution. The overall structure of the lens module is compact, with high light energy utilization and good image quality, making it suitable for automotive headlight illumination with multi-pixel light sources.

[0009] According to some alternative embodiments of the lens module, the image-side surface of the first lens is a low-order even-order aspherical surface.

[0010] Further optionally, the Abbe number of the second lens is greater than 80.

[0011] Alternatively, the refractive index of the third lens may be greater than 1.7.

[0012] Alternatively, the radius of curvature of the object side of the third lens is R1, and the radius of curvature of the image side of the third lens is R2, satisfying |R1|<|R2|; The equivalent focal length of the lens module is F0, and the equivalent focal length of the combination of the first and second lenses is F12, satisfying 0.45. <F12 / F0<0.55; The equivalent focal length of the third lens is F3, which satisfies 0.65. <F3 / F0<0.69。

[0013] Specifically, the first lens is made of plastic; the second lens and the third lens are both made of glass.

[0014] A lighting fixture according to a second aspect of the present invention includes: a multi-pixel light source and a lens module, wherein the lens module is disposed on the light-emitting side of the multi-pixel light source, and a third lens is disposed adjacent to the multi-pixel light source. The lens module is the lens module described in the first aspect of the present invention.

[0015] Furthermore, the equivalent focal length of the lens module is F0, and the total optical length from the object side of the first lens to the imaging surface of the multi-pixel light source is TOTR, satisfying TOTR / F0<2.8.

[0016] Furthermore, the actual working F / # of the lens module is WFNO, which satisfies WFNO<0.7.

[0017] A vehicle according to a third aspect embodiment of the present invention includes a lamp. The lamp is the lamp described in the second aspect embodiment of the present invention.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a side view of the lens module in some embodiments of the present invention; Figure 2 This is a front view of the lens module in some embodiments of the present invention; Figure 3 This is an optical path diagram of the lens module in some embodiments of this utility model; Figure 4 The graph shows the modulation transfer function (MTF) curve at 10 meters for Example 1. Figure 5 This is a modulation transfer function (MTF) curve at 25 meters for Example 1; Figure 6 This is an application example diagram of the lens module combined with near-beam widening in Embodiment 1; Figure 7 This is an application example diagram of the lens module in conjunction with the ADB function in Embodiment 1; Figure 8 This is a graph showing the field curvature and distortion of the lens module in Example 1; Figure 9 This is a chromatic aberration curve of the lens module in Example 1; Figure 10 This is a dot diagram of the lens module in Example 1; Figure 11 This is a graph showing the field curvature and distortion of the lens module in Example 2; Figure 12 This is a chromatic aberration curve of the lens module in Example 2; Figure 13 This is a dot diagram of the lens module in Example 2; Figure 14 This is a graph showing the field curvature and distortion of the lens module in Example 3; Figure 15 This is a chromatic aberration curve of the lens module in Example 3; Figure 16 This is a dot diagram of the lens module in Example 3.

[0020] Figure label: Lens module 100 First lens 10, second lens 20, third lens 30 The object-side surface of the first lens S1, the image-side surface of the first lens S2 The object-side surface of the second lens S3, the image-side surface of the second lens S4 The object-side surface of the third lens (S5) and the image-side surface of the third lens (S6) Multi-pixel light source 200. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the terms "center," "inner," "outer," "axial," 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 utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The following is for reference. Figures 1-3 A lens module 100 according to an embodiment of the present utility model is described.

[0025] The lens module 100 of this utility model embodiment has a wide range of applications and can be used in various optical scenarios such as vehicle lights and lighting devices. This application describes the lens module 100 as an example of its application in vehicle lights, and will not be repeated hereafter.

[0026] like Figure 1 As shown, a lens module 100 according to an embodiment of the present invention includes a first lens 10, a second lens 20 and a third lens 30 arranged sequentially from the object side to the image side along the optical axis.

[0027] In the existing technology, some vehicle lights often adopt a four-piece or more lens module 100 architecture with multiple pixel light sources to achieve lighting and projection functions, resulting in a large overall module size and bulky volume, which is not conducive to compact space design.

[0028] In contrast, the lens module 100 of this application adopts a three-lens structure, which is simpler in overall structure while ensuring optical performance. It can effectively match multi-pixel light sources to achieve light distribution control of high beam and low beam, and reduce the overall size of the lens module 100, thereby reducing assembly difficulty and manufacturing cost. This is beneficial for achieving lightweighting and integration in space-constrained application scenarios such as automotive lights.

[0029] Among them, the object side S1 of the first lens is a plane, and the image side S2 of the first lens is a concave surface.

[0030] The first lens object side S1 adopts a planar structure, which facilitates flat docking with the mechanical structure or optical components of other modules, such as sealing covers, thereby improving the integration of the vehicle lamp.

[0031] In addition, the object side S1 of the first lens is a plane, which can avoid unnecessary initial refraction under paraxial incident light conditions, reduce the introduction of aberrations, and maintain the stability of beam propagation.

[0032] The second lens 20 is a biconvex lens. That is, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is convex.

[0033] By setting a second lens 20 with two convex surfaces, it is helpful to optimize the position of the aperture stop. The aperture stop is usually set near or on the surface of the lens to improve the incident angle of off-axis rays and suppress higher-order aberrations such as coma, astigmatism and distortion.

[0034] In addition, the biconvex lens supports a large field of view, especially expanding the horizontal field of view, which is beneficial to meeting the requirements of low beam illumination of vehicle lights for the width of the lateral light pattern, and realizing wide and uniform road lighting.

[0035] Especially when used in conjunction with multi-pixel light sources, it can achieve precise control of the cutoff line between low and high beams and stability of high and low beam switching, thereby improving driving safety.

[0036] The third lens 30 is a meniscus lens, and the object side S5 of the third lens is convex, while the image side S6 of the third lens is concave.

[0037] Specifically, the third lens 30 is a meniscus lens. Its convex surface faces the object side, and its concave surface faces the image side. This structure provides weak positive optical power or near-neutral optical power, allowing for precise correction of residual aberrations without affecting the overall optical balance of the system. The concave design of the image side helps ensure a certain back focal length (BFL, the distance from the vertex of the last lens in the lens module 100 to the surface where the light source is located), improving the heat dissipation of the lens module 100 in automotive lighting applications.

[0038] Furthermore, in this embodiment, the stop of the lens module 100 is positioned between the first lens 10 and the second lens 20. Since the object-side surface S5 of the third lens is convex, light rays entering the third lens 30 can be appropriately converged, allowing the stop to be positioned closer to the third lens 30. This arrangement helps optimize the incident angle of off-axis rays, reduces the tilt of the principal ray at the edge of the image plane, effectively improves off-axis aberrations such as coma, astigmatism, and field curvature, and enhances the illumination uniformity and sharpness of the edge field of view.

[0039] Therefore, the third lens 30 adopts a meniscus lens, which helps to improve the optical performance of the entire lens module 100, while also taking into account the heat dissipation requirements of the overall module.

[0040] like Figure 3 The diagram shown is an optical path diagram of the lens module 100 according to an embodiment of the present invention. This optical path diagram can clearly show the propagation process of light emitted from the light source, refracted sequentially by the third lens, the second lens, and the first lens, demonstrating the optical principle by which the lens module 100 achieves large aperture and wide field of view illumination.

[0041] According to some alternative embodiments of the lens module 100, the first lens image side surface S2 is a low-order even-order aspherical surface.

[0042] Optionally, the image-side surface S2 of the first lens is a concave even-order aspherical surface, which can better correct system aberrations.

[0043] Further optionally, the Abbe number of the second lens 20 is greater than 80.

[0044] In the above technical solution, the second lens 20 is made of high Abbe number material, which can effectively correct chromatic aberration. Combined with optimized aperture position, it suppresses various aberrations such as distortion and supports the realization of a large field of view, which is conducive to expanding the lateral coverage width of low beam illumination and meeting the light distribution requirements of vehicle lights.

[0045] Furthermore, in automotive lighting applications, especially when used with white LEDs or multi-pixel LEDs, the wide spectrum and rich colors of the light source can lead to blurred cutoff lines for low beams, diffused high beams, or colored halos at the edges if color difference control is poor, affecting lighting safety. The second lens 20, made of high Abbe number materials, helps to achieve a purer and sharper beam distribution, meeting the beam control requirements of automotive lighting standards.

[0046] Alternatively, the refractive index of the third lens 30 may be greater than 1.7.

[0047] By selecting high refractive index materials, the surface curvature of the third lens 30 and the system optical power distribution can be optimized while ensuring optical performance, thereby providing design freedom for the BFL.

[0048] Alternatively, the radius of curvature of the object-side surface S5 of the third lens is R1, and the radius of curvature of the image-side surface S6 of the third lens is R2, satisfying |R1| < |R2|. This configuration makes the object-side surface S5 of the third lens relatively steeper, which helps to effectively converge light within a limited space. Combined with its meniscus structure facing the light source, it helps to extend the beam fl. This configuration also helps to ensure that the distance between the third lens 30 and the light source remains greater than 3mm, thereby meeting the thermal reliability requirements of the vehicle lamp under continuous operating conditions.

[0049] The equivalent focal length of the lens module 100 is F0, and the equivalent focal length of the first lens 10 and the second lens 20 in combination is F12, which satisfies 0.45<F12 / F0<0.55. Such arrangement realizes reasonable distribution of the optical power of the light transmission module, prevents aberrations from being concentrated on a single lens, is beneficial to reducing on-axis and off-axis aberrations such as spherical aberration and coma, and improves imaging quality.

[0050] The equivalent focal length of the third lens 30 is F3, which satisfies 0.65<F3 / F0<0.69. The matching of optical power between the respective lenses is further optimized, so that the third lens 30 bears a moderate positive optical power, which not only helps to control the total optical length of the whole, but also is beneficial to improving field curvature and distortion, realizing large field-of-view angle illumination, and can cooperate to complete the transverse broadening of the low-beam light pattern.

[0051] Specifically, the first lens 10 is a plastic member; both the second lens 20 and the third lens 30 are glass members.

[0052] Wherein, the first lens 10 is located at the front end on the object side, and the use of a plastic member facilitates the realization of a complex aspheric structure by means of injection molding or the like, reduces the processing cost, and is beneficial to mass production.

[0053] While the second lens 20 and the third lens 30 bear the main optical power of the lens module 100, and have high requirements for thermal stability, weather resistance and refractive index consistency. It can be known that the glass member has a low thermal expansion coefficient, high temperature resistance and optical stability, which can effectively avoid problems such as lens deformation, refractive index drift or optical axis offset caused by ambient temperature changes or heat generation during long-time operation, thereby ensuring the stability and reliability of the lens module 100 during long-term use.

[0054] Further, the first lens 10 is an optical-grade plastic member, and the second lens 20 and the third lens 30 are optical-grade glass members.

[0055] Optionally, the first lens 10 is preferably a polymethyl methacrylate (PMMA) member or a polycarbonate (PC) member, etc.

[0056] Both the second lens 20 and the third lens 30 are glass members, preferably optical glass.

[0057] Through the above combination manner, the cost control can be considered while ensuring the optical performance of the lens module 100.

[0058] A lamp according to an embodiment of the second aspect of the present utility model comprises: a multi-pixel light source and a lens module 100, wherein the lens module 100 is arranged on the light exit side of the multi-pixel light source, and the third lens 30 is arranged adjacent to the multi-pixel light source. The lens module 100 adopts the lens module 100 according to the embodiment of the first aspect of the present utility model.

[0059] It is worth noting that there are no restrictions on the types of lamps; they can be applied to various vehicle lighting devices, such as headlights, adaptive front lighting systems (AFS), intelligent pixel headlights, daytime running lights, turn signals, taillights, brake lights, or fog lights.

[0060] In some specific embodiments, each light-emitting unit of the multi-pixel light source can be controlled independently. Combined with the excellent light distribution performance of the lens module 100 of this application, a variety of intelligent lighting functions can be realized.

[0061] The lens module 100 of this embodiment has a large field of view, which can be used for lateral beam pattern broadening in low beam illumination; it has a high center field of view modulation transfer function (MTF), resulting in clear imaging. Meanwhile, the lens module 100 adopts a simple three-piece structure, which helps to reduce overall size, assembly difficulty, and manufacturing costs. The overall lamp structure is compact, with precise light distribution and stable thermal performance, making it suitable for modern automotive lighting systems with high requirements for spatial layout and optical performance.

[0062] Furthermore, the equivalent focal length of the lens module 100 is F0, the total optical length of the imaging surface of the first lens object side S1 to the multi-pixel light source is TOTR, which satisfies TOTR / F0<2.8; and the actual working F / # of the lens module 100 is WFNO, which satisfies WFNO<0.7.

[0063] In this way, while ensuring optical performance, the lens module 100 achieves a highly compact structural design, effectively shortening the axial dimension, which helps to reduce the overall volume of the headlight module, improve space utilization, and facilitates its arrangement and integration in the limited front compartment space.

[0064] Meanwhile, the actual operating F / # of the lens module 100 is WFNO, satisfying WFNO < 0.7. It can be seen that a smaller F / # means that the lens module 100 has a larger relative aperture and stronger light-gathering capability, enabling it to efficiently collect divergent light emitted from multi-pixel light sources and improve light energy utilization. That is, under the same light source output power, higher illumination brightness can be obtained, while maintaining brightness while reducing power consumption and heat generation, thus reducing reliance on heat dissipation structures.

[0065] A vehicle according to a third aspect of the present invention includes a lamp. The lamp is an embodiment of the lamp of the second aspect of the present invention.

[0066] It is worth noting that the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The vehicle is equipped with lights, which can be located at the front, rear, sides, or top of the vehicle, for illumination, signal indication, and beam control functions.

[0067] By employing the lens module 100 of this invention in conjunction with a multi-pixel light source, the vehicle can achieve a wider field of view, effectively matching the lateral beam width requirements of low-beam illumination. Simultaneously, the vehicle exhibits higher light energy utilization, resulting in higher illumination brightness. The compact optical length of the lens module 100 helps reduce installation space, and its improved thermal stability ensures stable and reliable light distribution performance under various complex operating conditions.

[0068] The following is for reference. Figures 1-2 The lens module 100 according to an embodiment of the present invention is described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0069] The lens module 100 includes a first lens 10, a second lens 20, and a third lens 30 arranged sequentially from the object side to the image side along the optical axis. The object side surface S1 of the first lens is planar, and the image side surface S2 of the first lens is concave. The image side surface S2 of the first lens is a low-order even-order aspherical surface.

[0070] The second lens 20 is a biconvex lens. The Abbe number of the second lens 20 is greater than 80.

[0071] The third lens 30 is a meniscus lens, with its object-side surface being convex and its image-side surface being concave. The refractive index of the third lens 30 is greater than 1.7. The radius of curvature of the object-side surface of the third lens 30 is R1, and the radius of curvature of the image-side surface of the third lens 30 is R2, satisfying |R1|<|R2|.

[0072] The first lens 10 is made of plastic. The second lens 20 and the third lens 30 are both made of glass.

[0073] The technical solution of this utility model is further illustrated below through some specific numerical examples.

[0074] Example 1 Embodiment 1 of this utility model employs a three-lens structure, with a first lens, a second lens, and a third lens arranged sequentially from the object side to the image side along the optical axis. The first lens has a planar object side and a concave even-order aspherical surface on the image side; the second lens is a biconvex lens; and the third lens is a meniscus lens with a convex object side and a concave image side. Table 1 below lists the main design parameters of Embodiment 1.

[0075] Table 1. Design parameters of lens module 100

[0076] As shown in Table 1, the actual operating F / # of this embodiment is 0.662, which meets the technical requirement of WFNO < 0.7. This F-number of less than 0.7 indicates that the lens has a large aperture, which can efficiently collect divergent light from multi-pixel light sources, thereby improving light energy utilization. Under the same light source power, power consumption and heat generation are reduced while maintaining brightness.

[0077] Meanwhile, the full field of view (FFOV) listed in Table 1 is 52.0°, which is a large field of view design. The wide field of view can match the requirements of automotive low beam headlights for lateral illumination width, thereby widening the low beam pattern, improving the driver's field of vision, and enhancing driving safety.

[0078] Furthermore, the total optical length TOTR in Table 1 is 35mm. Combined with the equivalent focal length F1=12.78mm, we can calculate that TOTR / F1≈2.74, which satisfies the condition "TOTR / F1<2.8". This indicates that the lens module 100 has a compact total optical length, which is beneficial to reducing the overall volume of the headlight module and making it easier to arrange in the space-constrained front compartment of a car.

[0079] In this first embodiment, the surface shape of the aspherical surface is defined by the following mathematical expression: Where z is the sag at position r on the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R, and R is the radius of curvature; k is the conic coefficient, and A~J are the coefficients of different even-degree terms; The aspherical coefficients of the first lens 10 in this embodiment are shown in Table 3: Table 3 Aspherical coefficients of the first lens 10 in Embodiment 1

[0080] Among them, the coefficient of the higher-order term DJ is 0, which makes it easy to process.

[0081] The lens module 100 adopts a 1P2G (one plastic, two glass) structure. The second lens uses high Abbe number Vd=81.61 optical glass, effectively correcting chromatic aberration. The third lens is a meniscus glass lens with a high refractive index Nd=1.729, whose object-side radius of curvature |R1| (11.78mm) is smaller than the image-side radius of curvature |R2| (56.54mm), satisfying |R1|<|R2|. This design helps to extend the back focal length (BFL). Simultaneously, the back focal length (BFL) is 3.5mm (see Table 1), exceeding the design requirement of 3mm. This provides sufficient space between the lens and the heat source (light source), effectively improving the module's thermal reliability during continuous illumination.

[0082] In this first embodiment, the large field of view can be used to meet near beam widening, while the small field of view within ±10° can be used for ADB (Adaptive Diffuse Optimization) function. Therefore, within the small field of view ±10° at a specific frequency of 3 lp / mm, combined with... Figures 4-7 At 10m / 25m, the contrast ratio of the optical imaging lens is greater than 0.4, which ensures that the pixelated illumination boundary of the car headlights is clear.

[0083] The aberration analysis curves of lens module 100 in this embodiment are shown below. Figures 8-9 As shown.

[0084] like Figure 8 As shown, the field curvature and distortion of this embodiment are well controlled, and the image is clear from the center to the edge without obvious deformation. Figure 9 The display shows a maximum field of view of up to 26°, and the image height changes uniformly with increasing viewing angle, indicating that the system can provide a wide and consistent lighting effect. These features enable this invention to not only provide bright and clear illumination over a large area, but also ensure uniform light distribution, thus improving the performance of vehicle lights.

[0085] Combination Figure 10 The dot plot of the lens group shows that the light spots in each field of view are highly concentrated and the RMS radius is small, indicating that the system has excellent imaging quality, good focusing performance and high resolution, and can effectively improve the clarity and light energy utilization of the illumination system.

[0086] The RMS radius and GEO radius of each field of view are shown in Table 4.

[0087] It's worth noting that the RMS radius refers to the root mean square radius, which describes the distance distribution from the convergence point of light rays to the ideal focal point in an optical system within a specific field of view. Simply put, it measures the dispersion of the actual focal point relative to the theoretically optimal focal position; a smaller value indicates higher image quality and a more concentrated light spot.

[0088] GEO radius: This refers to the geometric radius, also known as the maximum ray aberration, and is an indicator describing the size of the spot formed by light rays on the imaging plane. The GEO radius is half the distance between the two outermost points after all light rays reach the image plane at a specific field of view. Compared to the RMS radius, the GEO radius more intuitively reflects the maximum extent of the light spot.

[0089] Table 4. RMS radius and GEO radius of each field of view in Example 1

[0090] As can be seen from the RMS radius and GEO radius data for each field of view shown in Table 4, the three-element optical lens of this invention exhibits excellent imaging concentration in the central field of view (field of view 1), with an RMS radius of 51.140 micrometers and a GEO radius of 150.160 micrometers. This indicates a highly concentrated light spot in the central region, resulting in clear and sharp imaging, fully meeting the requirements of adaptive high beam (ADB) for pixel boundary sharpness. Even in the edge fields of view (such as field of view 6), controllable aberration levels are maintained, ensuring the uniformity and reliability of illumination throughout the overall field of view. As shown in Table 4, the lens module 100 of Embodiment 1 of this application achieves good imaging quality under a large field of view, while also maintaining system compactness and thermal stability.

[0091] Example 2 The design parameters for large aperture and large field of view are shown in Table 5: Table 5 Lens module design parameters in Example 2

[0092] The parameters of each lens element in the optical lens of Example 2 are shown in Table 6: Table 6. Lens parameters in Example 2

[0093] The aspherical expression of the image side surface S2 of the first lens is as follows: Where z is the sag at position r on the aspherical surface, c is the paraxial curvature of the aspherical surface, c = 1 / R, R is the radius of curvature, k is the conic coefficient, and A~J are coefficients of different even-order terms. The aspherical coefficients of the lens module 100 in this embodiment are shown in Table 7: Table 7 Aspherical coefficients in Example 2

[0094] Among them, the coefficient of the higher-order term DJ is 0, which makes it easy to process.

[0095] The aberration analysis curves of the two-mirror group in this embodiment are shown below. Figures 11-13 As shown in Table 8, the RMS radius and GEO radius of each field of view are shown in Table 8.

[0096] Table 8. RMS radius and GEO radius of each field of view in Example 2

[0097] Example 3 The design parameters for the large aperture and large field of view in Example 3 are shown in Table 9: Table 9 Design parameters of lens module 100 in Example 3:

[0098] The parameters of each lens element in the optical lens of Example 3 are shown in Table 10: Table 10 Lens parameters in Example 3

[0099] The expression for an aspherical surface is as follows: Where z is the sag at position r on the aspherical surface, c is the paraxial curvature of the aspherical surface, c=1 / R, R is the radius of curvature, K is the conic coefficient, and A~J are coefficients of different even-order terms. The aspherical coefficients of the optical lens module (1) of this patent are shown in Table 11: Table 11 Aspherical coefficients in Example 3

[0100] Among them, the coefficient of the higher-order term DJ is 0, which makes it easy to process.

[0101] The aberration analysis curves of each lens group are shown below. Figures 14-16 As shown in Table 12, the RMS radius and GEO radius of each field of view are as follows.

[0102] Table 12 RMS radius and GEO radius of each field of view in Example 3

[0103] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0104] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A lens module, characterized in that, The lens module includes a first lens, a second lens, and a third lens arranged sequentially from the object side to the image side along the optical axis. Wherein, the object side of the first lens is a plane, and the image side of the first lens is a concave surface; The second lens is a biconvex lens; the third lens is a meniscus lens, and the object side of the third lens is convex, while the image side of the third lens is concave.

2. The lens module according to claim 1, characterized in that, The image-side surface of the first lens is a low-order even-order aspherical surface.

3. The lens module according to claim 1, characterized in that, The Abbe number of the second lens is greater than 80.

4. The lens module according to claim 1, characterized in that, The refractive index of the third lens is greater than 1.

7.

5. The lens module according to claim 1, characterized in that, The object-side radius of curvature of the third lens is R1, and the image-side radius of curvature of the third lens is R2, satisfying |R1|<|R2|. The equivalent focal length of the lens module is F0, and the equivalent focal length of the combination of the first and second lenses is F12, satisfying 0.

45. <F12 / F0<0.55; The equivalent focal length of the third lens is F3, which satisfies 0.

65. <F3 / F0<0.69。 6. The lens module according to claim 5, characterized in that, The first lens is made of plastic; the second lens and the third lens are both made of glass.

7. A lamp, characterized in that, include: Multi-pixel light source; The lens module according to any one of claims 1-6 is disposed on the light-emitting side of the multi-pixel light source, and the third lens is disposed adjacent to the multi-pixel light source.

8. The lamp according to claim 7, characterized in that, The equivalent focal length of the lens module is F0, and the total optical length from the object side of the first lens to the imaging surface of the multi-pixel light source is TOTR, satisfying TOTR / F0<2.

8.

9. The lamp according to claim 8, characterized in that, The actual working F / # of the lens module is WFNO, which satisfies WFNO < 0.

7.

10. A vehicle, characterized in that, Including the luminaires according to any one of claims 7-9.

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