High-efficiency optical lens with high central field-of-view image resolution

Abstract

The invention relates to an optical lens with high efficiency and high central field-of-view image resolution. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens and an image surface which are arranged in sequence, the surfaces of the first lens, the second lens and the third lens are aspheric surfaces, and the Abbe coefficient of the second lens is lower than that of the other three lenses; the first surface and the second surface of the second lens are bent towards one side far away from the image surface; the vignetting diaphragm is arranged on the first surface, far away from the image surface, of the fourth lens; and the aperture diaphragm is arranged on the first surface or the second surface of the first lens, and the distance between the aperture diaphragm and the vignetting diaphragm is 23-50 mm. The lighting efficiency is high; the surfaces of the first lens, the second lens and the third lens are aspheric surfaces, so that the transverse chromatic aberration is optimized, and the abbe coefficients of the other three lenses are higher than that of the second lens, so that the overall transverse chromatic aberration is reduced; by setting the distance between the aperture diaphragm and the vignetting diaphragm, the imaging quality of the central view field can be improved.

Description

Technical Field

[0001] The invention relates to the field of optical design, and in particular to an optical lens with high efficiency and high central field of view image resolution. Background Art

[0002] Traditional headlight devices can provide good lighting at night, but when a vehicle appears in the opposite or same direction in front of the driver, it may cause dazzle to the other driver, posing a safety hazard.

[0003] Pixelated lighting fixtures can solve the above problems, mainly by identifying the position of the vehicle in front and shielding the vehicle position to avoid glare, while the area outside the vehicle in front is still well illuminated. The higher the resolution of the pixelated lighting device, the more accurately it can shield the area in front of the vehicle, making the lighting range outside the shielded area larger, and the surrounding Figure 1 It can be seen that when the segmented pixels are large, the obstacles are not illuminated, and when the segmented pixels are small, the obstacles can be illuminated and driving is safer. Therefore, with high pixel resolution, the lighting area can avoid more potential risks and provide safer driving at night.

[0004] High-resolution pixelated lighting devices are different from traditional lighting devices for car lights. They not only need to provide efficient lighting efficiency, but also need to take into account clear image resolution. Therefore, a lens group is needed to optimize and reduce various optical aberrations, such as distortion, spherical aberration, field curvature, etc., to obtain better image quality. Usually, a lens group with a smaller aperture can optimize the optical aberration of the system well, but a lens group with a smaller aperture cannot provide high lighting efficiency; a larger aperture has high lighting efficiency, but usually requires 5 or more lenses to correct aberrations, which makes the cost higher. In addition, the existing pixelated lighting devices have large lateral chromatic aberrations and the image resolution of the center field of view is not high enough compared to the edge field of view. Summary of the invention

[0005] Based on this, it is necessary to provide an optical lens with high efficiency and high central field of view image resolution to address at least some of the above problems.

[0006] An optical lens with high efficiency and high central field image resolution, comprising:

[0007] A first lens, a second lens, a third lens, a fourth lens and an image plane are arranged in sequence, wherein a side of each lens away from the image plane is a first surface, and a side close to the image plane is a second surface;

[0008] The first lens, the third lens and the fourth lens have positive optical power, and the second lens has negative optical power;

[0009] The surfaces of the first lens, the second lens and the third lens are aspherical; the Abbe coefficient of the second lens is lower than that of the other three lenses;

[0010] and the first surface and the second surface of the second lens are both curved toward a side away from the image plane;

[0011] An aperture stop is provided at the first lens, the second lens, or a position between the first lens and the second lens;

[0012] The vignetting stop is arranged at the third lens element or the fourth lens element or at a position between the third lens element and the fourth lens element.

[0013] In some embodiments, the Abbe coefficients of the four lenses are different.

[0014] In some embodiments, a surface of the fourth lens is spherical.

[0015] In some embodiments, the aperture stop is disposed on a surface of the first lens opposite to the image surface.

[0016] In some embodiments, a ratio of a clear aperture L4 of a second surface of the fourth lens facing the image plane to a back focus J1 of the lens group is greater than 2.

[0017] In some embodiments, the vignetting stop is disposed on the first surface of the fourth lens opposite to the image surface, the aperture stop is disposed on the first surface or the second surface of the first lens, and the distance between the aperture stop and the vignetting stop is 23-50 mm.

[0018] In some embodiments, the refractive index of the fourth lens is greater than the refractive index of the third lens.

[0019] The above-mentioned optical lens with high efficiency and high central field image resolution has at least the following beneficial technical effects:

[0020] In this embodiment, the aperture stop disposed on the first surface or the second surface of the first lens can limit the system aperture, the light exit aperture Z1 of the central field of view of the lens group on the first surface of the first lens is greater than 70% of the light exit aperture L1 of the surface, and the light exit aperture B1 of the edge field of view on the first surface of the first lens is greater than 50% of the light exit aperture L1 of the surface, and the lighting efficiency is high;

[0021] In the present application, the vignetting stop placed on the first surface of the fourth lens away from the image plane improves the image quality by limiting the aperture of the large field of view; the four lenses are combined to correct and optimize the optical aberrations of the system, such as distortion, spherical aberration, field curvature, etc., to obtain better image quality.

[0022] The surfaces of the first lens, the second lens and the third lens of the present application are aspherical, which is beneficial to optimizing lateral chromatic aberration; and the Abbe coefficients of the other three lenses are higher than that of the second lens, which is beneficial to reducing the overall lateral chromatic aberration.

[0023] The pixelated lighting device of the present application has high resolution and can more accurately shield the vehicle area in front, making the lighting range outside the shielded area larger. Figure 1 It can be seen that when the segmented pixels are small, obstacles can be illuminated and driving is safer. Therefore, with high pixel resolution, the illuminated area can avoid more potential risks and provide safer driving at night.

[0024] The lens assembly provided by the present invention has low cost, high optical efficiency and good image quality while having a large aperture, small lateral chromatic aberration, and high resolution and imaging quality of the central field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram showing the comparison between the degree of pixel segmentation and the degree of illumination of obstacles;

[0026] Figure 2 A schematic diagram of an optical lens with high efficiency and high central field image resolution provided by an embodiment of the present invention;

[0027] Figure 3 for Figure 2 A schematic diagram of the aperture stop and the vignetting stop, the total length L of the optical lens with high efficiency and high image resolution in the central field of view, and the angle α of the light rays collected in the central field of view;

[0028] Figure 4 Schematic diagram of the light aperture L1 of the first surface of the first lens and the light exit aperture Z1 of the central field of view;

[0029] Figure 5 Schematic diagram of the light aperture L1 of the first surface of the first lens and the light exit aperture B1 of the edge field of view;

[0030] Figure 6 Schematic diagram of the second surface clear aperture L4 of the fourth lens and the back intercept J1 of the lens group;

[0031] Figure 7 Schematic diagram of MTF of this embodiment (0-12.5lp / mm);

[0032] Figure 8 Schematic diagram of MTF of this embodiment (0-8lp / mm);

[0033] Fig. 9 is a distortion diagram of this embodiment;

[0034] Fig.10 A schematic diagram of an optical lens provided by another embodiment of the present invention;

[0035] Fig.11 for Fig.10 Schematic diagram of setting the aperture stop and the vignetting stop and the total length L of the optical lens;

[0036] Fig.12 for Fig.10 Schematic diagram of the light aperture L1 of the first surface of the first lens and the light exit aperture Z1 of the central field of view;

[0037] Fig.13 for Fig.10 Schematic diagram of the light aperture L1 of the first surface of the first lens and the light exit aperture B1 of the edge field of view;

[0038] Fig.14 for Fig.10 Schematic diagram of the second surface clear aperture L4 of the fourth lens and the back focus J1 of the lens group;

[0039] Fig.15 for Fig.10 A schematic diagram of the angle α of light rays collected by the central field of view in an embodiment;

[0040] Fig.16 for Fig.10 MTF diagram of the embodiment (0-12.5lp / mm);

[0041] Fig.17 for Fig.10 MTF diagram of the embodiment (0-8lp / mm);

[0042] Fig.18 for Fig.10 A distortion diagram of an embodiment of the present invention;

[0043] Fig.19 for Fig.10 A lateral chromatic aberration curve diagram of an embodiment of the present invention;

[0044] In the figure,

[0045] 10. The first lens;

[0046] 20. Second lens;

[0047] 30. The third lens;

[0048] 40. The fourth lens;

[0049] 50. Image plane;

[0050] 60. Aperture diaphragm;

[0051] 70. Vignetting stop. DETAILED DESCRIPTION

[0052] The present invention will be further described below in conjunction with the accompanying drawings.

[0053] To facilitate understanding of the present invention, various embodiments defined by the claims of the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are given in the drawings, which contain various specific details to assist in this understanding, but these details should be regarded as exemplary only. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Accordingly, those of ordinary skill in the art will recognize that changes and improvements may be made to the various embodiments described herein without departing from the scope of the present invention defined by the appended claims. In addition, for the sake of clarity and brevity, descriptions of well-known functions and configurations may be omitted.

[0054] It will be apparent to those skilled in the art that the following description of various embodiments of the present invention is provided for illustrative purposes only and not for the purpose of limiting the invention as defined by the appended claims.

[0055] Throughout the specification and claims of this application document, the words "include" and "comprise" and variations of the words, such as "include" and "include" mean "including but not limited to", and are not intended to (and will not) exclude other components, integers or steps. Features, integers or characteristics described in conjunction with a particular aspect, embodiment or example of the present invention will be understood to be applicable to any other aspect, embodiment or example described herein, unless incompatible therewith.

[0056] It should be understood that the singular forms "a", "an", and "the" include plural references unless the context clearly dictates otherwise. The expressions "including" and / or "may include" used in the present invention are intended to indicate the presence of corresponding functions, operations, or elements, and are not intended to limit the presence of one or more functions, operations, and / or elements. In addition, in the present invention, the terms "including" and / or "having" are intended to indicate the presence of characteristics, quantities, operations, elements, and components, or combinations thereof, disclosed in the application documents. Therefore, the terms "including" and / or "having" should be understood as additional possibilities of one or more other characteristics, quantities, operations, elements, and components, or combinations thereof.

[0057] In the present invention, the expression "or" includes any or all combinations of the words listed together. For example, "A or B" may include A or B, or may include both A and B.

[0058] It should be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intervening element; when an element is considered to be "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or there can also be an intervening element.

[0059] The terms “upper”, “lower”, “left”, “right”, etc. mentioned in the text are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the context of the relevant field and this specification, and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0061] like Figure 2-Figure 3 As shown, in one embodiment of the present invention, there is provided an optical lens with high efficiency and high central field image resolution, comprising:

[0062] A first lens 10, a second lens 20, a third lens 30, a fourth lens 40 and an image plane 50 are arranged in sequence, and a side of each lens away from the image plane 50 is a first surface, and a side close to the image plane 50 is a second surface;

[0063] The first lens 10, the third lens 30 and the fourth lens 40 have positive focal power, and the second lens 20 has negative focal power. The focal power φ represents the refraction ability of the optical system to the incident parallel light beam. The larger the value of φ, the more the parallel light beam is refracted; when φ>0, the light refraction is convergent; when φ<0, the light refraction is divergent. When φ=0, it corresponds to plane refraction. At this time, the parallel light beam along the axis is still a parallel light beam along the axis after refraction, and no refraction phenomenon occurs;

[0064] The surfaces of the first lens 10, the second lens 20 and the third lens 30 are aspherical surfaces; the Abbe coefficient of the second lens 20 is lower than that of the other three lenses;

[0065] Furthermore, the first surface and the second surface of the second lens 20 are both curved toward a side away from the image plane 50 .

[0066] Specifically, in one embodiment, the vignetting stop 70 is disposed on the first surface of the fourth lens 40 facing away from the image plane 50, and the distance between the aperture stop 60 and the vignetting stop 70 is 23-50 mm. In this case, the aperture stop 60 is disposed on the first surface or the second surface of the first lens 10. The following table shows a set of lens group surface shapes, positions and material parameters of an embodiment of the present invention:

[0067]

[0068] The expression of aspheric lens is as follows:

[0069]

[0070] Among them, z is the vector height 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 cone coefficient, and A~J are high-order coefficients.

[0071] The following table shows the aspheric surface parameters of this embodiment:

[0072]

[0073]

[0074] In this embodiment, the aperture stop 60 of the system coincides with the first surface of the first lens 10, the vignetting stop 70 is disposed on the first surface of the fourth lens 40, and the distance between the aperture stop 60 and the vignetting stop 70 is 42.17 mm. The total length of the lens group in this embodiment is 59.66 mm.

[0075] The lens assembly of the present invention has a high energy collection rate for each field of view. The light angle (half angle) collected by the central field of view of the specific implementation example 1 is greater than 48 degrees (as shown in the attached figure). Figure 3 ), so the lens group has a higher lighting efficiency. If a light source with a light-emitting angle of 2π is placed on the image plane 50, its energy utilization rate can also be greater than 40%.

[0076] The central field of view of the lens group of the present invention has good imaging quality, referring to Figure 7 , the MTF of the specific embodiment 1 is at 12.5lp / mm, and the central field of view is greater than 0.92 (corresponding to the top 0deg curve in the figure in the implementation case); reference Figure 8 , MTF is at 8lp / mm, and the central field of view is greater than 0.96 (corresponding to the 0deg curve at the top of the figure).

[0077] MTF is a scientific method to evaluate the resolution of a lens. The closer it is to 1, the better the image quality. Figure 7 The lines corresponding to the center field of view (0deg) are closer to 1 than the lines corresponding to the edge field of view (12.8deg), that is, the resolution of the center field of view is higher. lp / mm refers to the number of light and dark line pairs that can be seen within 1mm. The higher the number of line pairs, the higher the resolution.

[0078] refer to Fig. 9 , the distortion of the lens assembly described in the present invention is no more than 5%.

[0079] The present invention provides a four-piece low-cost lens group design that combines high optical efficiency and good image quality under a large aperture.

[0080] In this embodiment, the aperture stop 60 can limit the light aperture of the system. Figure 4 , Figure 5 The light-emitting aperture Z1 of the center field of view of the lens group on the first surface of the first lens 10 is larger than 70% of the light-transmitting aperture L1 of the surface, and the light-emitting aperture B1 of the edge field of view on the first surface of the first lens 10 is larger than 50% of the light-transmitting aperture L1 of the surface, so the lighting efficiency is high;

[0081] If the aperture stop 60 is not disposed on the surface of the first lens 10, an additional component for shielding light needs to be provided. However, if the aperture stop 60 is disposed on the surface of the first lens, the area outside the lens aperture is blocked from light, so the lens itself determines the aperture for light transmission, and no additional components need to be provided, which can greatly save costs.

[0082] Because the nighttime lighting in the middle of the road is higher than that on both sides of the road, the lighting requirements for the central field of view of the lens group are higher, while the lighting brightness of the edge field of view can be reduced. Therefore, the first surface vignetting stop 70 placed away from the image plane of the fourth lens 40 improves the image quality by limiting the aperture of the edge field of view. In combination with the four lenses, the optical aberrations of the system, such as distortion, spherical aberration, field curvature, etc., are corrected and optimized to obtain better image quality.

[0083] The half FOV of the lens group of the present invention is 12.8 degrees, which makes the lighting range larger and can improve driving safety. When the vehicle enters a curve, the lighting device equipped with the lens group can provide more lighting to one side of the curve to improve driving safety. The larger FOV provided by the lens group means that the range of providing more lighting to the curve is larger.

[0084] The pixelated lighting device of the present application has high resolution and can more accurately shield the vehicle area in front, making the lighting range outside the shielded area larger. Figure 1 It can be seen that when the segmented pixels are large, the obstacles are not illuminated, and when the segmented pixels are small, the obstacles can be illuminated and driving is safer. Therefore, with high pixel resolution, the lighting area can avoid more potential risks and provide safer driving at night.

[0085] The lens assembly vignetting stop 70 of this embodiment is disposed on the first surface of the fourth lens 40, and the vignetting factor parameters of each field of view are as follows:

[0086] X angle Y angle VDX VDY VCX VCY Center Field of View 0.00 0.00 0.00 0.00 0.13 0.13 0.00 8.96 0.00 -0.23 0.15 0.23 Edge field of view 0.00 12.80 0.00 -0.38 0.19 0.38

[0087] After the field of view and entrance pupil of the optical system are normalized, they can be regarded as unit circles. For example, the pupil coordinates (px=0, py=1) refer to the edge position in the y direction of the field of view. In the above table, the VDX item moves the center of the pupil in the x direction, and the VCX item makes the pupil larger or smaller in the x direction; the VDY item moves the center of the pupil in the y direction, and the VCY item makes the pupil larger or smaller in the y direction. In other words, the vignetting factor changes the original Px and Py, and the changed Px', Py' satisfy the following calculation formula:

[0088] Px'=VDX+Px(1-VCX)

[0089] Py'=VDY+Py(1-VCY)

[0090] For the x and y directions of the lens group, see Fig.12 Hint.

[0091] For lens groups, if the chromatic aberration is large, the lens group will also have color when used for vehicle lighting or projecting patterns. Commonly used vehicle modules use single lenses, which have large chromatic aberrations. Therefore, when used for lighting, dispersion will occur, such as the low beam cutoff line will have a blue color, which will cause discomfort to the driver. Fig.10 , providing another implementation example. In this embodiment, the central field of view has high image quality and efficiency, while also having excellent lateral chromatic aberration.

[0092] The following table shows the lens group surface shape, position and material parameters of this implementation case:

[0093]

[0094]

[0095] The expression of aspheric lens is as follows:

[0096]

[0097] Among them, z is the vector height 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 cone coefficient, and A~J are high-order coefficients.

[0098] The following table shows the aspheric surface parameters:

[0099]

[0100] like Fig.11 In this embodiment, the aperture stop 60 of the system coincides with the first surface of the first lens 10, and the vignetting stop 70 coincides with the first surface of the fourth lens 40. The distance between the aperture stop 60 and the vignetting stop 70 is 38.48 mm. The total length L of the lens group in this embodiment is 54.5 mm.

[0101] The lens group of this implementation case has a high energy collection rate for each field of view, and the light angle (half angle) collected by the central field of view is greater than 46 degrees (as shown in the attached Fig.15 ), so the lens group has a higher lighting efficiency. If a light source with a light-emitting angle of 2π is placed on the image plane 50, its energy utilization rate can also be greater than 40%.

[0102] The lens assembly of the present invention has good imaging quality. Fig.16 , the MTF of the specific implementation case is at 12.5lp / mm, and the central field of view is greater than 0.83 (corresponding to the top 0deg curve in the figure in the implementation case); reference Fig.17 , MTF is at 8lp / mm, and the central field of view is greater than 0.93.

[0103] MTF is a scientific method to evaluate the resolution of a lens. The closer it is to 1, the better the image quality. Fig.16 The lines corresponding to the center field of view (0deg) are closer to 1 than the lines corresponding to the edge field of view (12deg), that is, the resolution of the center field of view is higher. lp / mm refers to the number of light and dark line pairs that can be seen within 1mm. The higher the number of line pairs, the higher the resolution.

[0104] refer to Fig.18 , the distortion of the lens assembly of the present invention is no more than 5%; Fig.19 The lateral chromatic aberration of the lens group of the present invention does not exceed 1.1 μm. The multi-lens of the present invention has a strong ability to correct chromatic aberration, so when used as a vehicle module for lighting or projecting patterns, there will be no dispersion at the edges of the pattern, which can avoid causing discomfort to the driver.

[0105] In this embodiment, the aperture stop 60 can limit the light aperture of the system. Fig.12 , Fig.13 The light-emitting aperture Z1 of the central field of view of the lens group on the first surface of the first lens 10 is larger than 70% of the light-transmitting aperture L1 of the surface, and the light-emitting aperture B1 of the edge field of view on the first surface of the first lens 10 is larger than 50% of the light-transmitting aperture L1 of the surface, so the lighting efficiency is high;

[0106] In this embodiment, the surfaces of the first lens 10, the second lens 20, and the third lens 30 are aspherical surfaces, and each aspherical surface has more flexible adjustable parameters to correct various aberrations, which is beneficial to optimizing lateral chromatic aberration; and the Abbe coefficients of the other three lenses are higher than that of the second lens 20, which is beneficial to reducing the overall lateral chromatic aberration. Therefore, the lens assembly provided in this embodiment is low in cost, has high optical efficiency and good image quality while having a large aperture, and has excellent lateral chromatic aberration.

[0107] refer to Fig.14The ratio of the light-clearance diameter L4 (diameter of the light-clearance area) of the second surface of the fourth lens 40 facing the image plane 50 to the back focus J1 of the lens group (the distance between the center of the second surface of the fourth lens 40 facing the image plane 50 and the image plane 50) is greater than 2, which allows the lens group to have a larger light collection angle for the light source located at the image plane 50 (as shown in the figure, the half angle α is greater than 35°), thereby obtaining good lighting efficiency.

[0108] In some embodiments, the refractive index and Abbe coefficient of the material of the first lens, the second lens, the third lens, and the fourth lens are all different. Lenses of materials with different characteristics cooperate with each other to adjust to reduce chromatic aberration, and through actual tests, four lenses with different Abbe coefficients can better balance the chromatic aberration of the lens group.

[0109] In some embodiments, the surface of the fourth lens 40 is a spherical surface. The fourth lens is close to the light source and is made of glass material with better temperature tolerance. For glass, the processing cost of a spherical surface is much lower than that of an aspherical surface. Therefore, a spherical surface design is used to reduce costs, so that the lens assembly of the present invention can have better cost control.

[0110] refer to Figure 3 In some embodiments, the aperture stop 60 is disposed on the surface of the first lens 10 away from the image plane 50. When the lens group is used in a vehicle lighting device, the image plane 50 is the position of the light source, and the light emitted by the light source passes through the fourth lens 40, the third lens 30, and the second lens 20 in sequence, and finally exits from the first lens 10. The aperture stop 60 is disposed on the surface of the first lens 10 away from the image plane 50 so that the aperture of each field of view in the first lens 10 is as large as possible, that is, more light is emitted, thereby obtaining a higher lighting efficiency.

[0111] refer to Figure 6 and Fig.14 In some embodiments, the ratio of the clear aperture L4 (aperture of the clear area) of the second surface of the fourth lens 40 close to the image plane 50 to the back focus J1 of the lens group (the distance between the center of the second surface of the fourth lens 40 close to the image plane 50 and the image plane 50) is greater than 2, so that the lens group has a larger light collection angle (such as Figure 3 The half angle α is 48°), thereby achieving good lighting efficiency.

[0112] In some embodiments, the refractive index of the fourth lens 40 is greater than the refractive index of the third lens 30. When the lens group is used for vehicle lighting, the light source is set at the image plane 50 of the lens group, and the fourth lens 40 is closer to the light source. The light emitted by the light source preferentially passes through the fourth lens 40. The high refractive index has a stronger deflection energy for the light, and more energy emitted by the light source can be collected into the lens group, making the lighting efficiency of the lens group higher. Therefore, it is preferred to use a material with a higher refractive index than the third lens 30 for the fourth lens 40.

[0113] In some embodiments, an anti-reflection film is provided on part or all of the surfaces of the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40. The anti-reflection film reduces the energy loss caused by Fresnel reflection when light passes through the lens surface, thereby improving the lighting efficiency of the system.

[0114] refer to Figure 3 In some embodiments, the distance L between the first surface of the first lens 10 facing away from the image plane 50 and the image plane 50 does not exceed 80 mm, preferably, is less than 65 mm. Compared with the traditional lighting optical system, it has a smaller depth and is more advantageous for being arranged in a lamp with limited space.

[0115] In some embodiments, the half field of view FOV of the lens group is greater than 10.5°. The lens group of the present invention has a wider field of view FOV, and the half FOV of the implementation case is not less than 12 degrees, which makes the range of illumination larger and improves driving safety. The lighting device equipped with the lens group can provide more lighting to one side of the curve when the vehicle enters a curve to improve driving safety. The larger FOV provided by the lens group means a larger range of providing more lighting to the curve.

[0116] In some embodiments, the aperture of the first lens 10 is in the range of 40 to 60 mm. If the aperture is less than 40 mm, a higher system lighting effect cannot be obtained, and if the aperture is greater than 60 mm, the lens group is unable to obtain a better image resolution.

[0117] A light emitting component comprises a light source and the optical lens with high efficiency and high central field of view image resolution, wherein the light source is arranged on the image plane 50.

[0118] A vehicle comprises a vehicle body and the light-emitting component, wherein the light-emitting component is arranged on the vehicle body.

[0119] In the above description, although expressions such as "first" and "second" may be used to describe various elements of the present invention, they are not intended to limit the corresponding elements. For example, the above expressions are not intended to limit the order or importance of the corresponding elements. The above expressions are used to distinguish one component from another component.

[0120] The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. A singular expression includes a plural expression unless there is a significant difference in context or scheme therebetween.

[0121] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

[0122] Those skilled in the art will understand that the various technical features of the above-described embodiments may be omitted, added or combined in any manner accordingly. To make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, and the simple transformation methods that can be thought of by those skilled in the art and the solutions for making adaptive and functional structural transformations to the prior art should be considered to be within the scope of this specification.

[0123] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that although the present invention has been shown and described with reference to various embodiments, for ordinary technicians in the field, various deformations and improvements in several forms and details can be made without departing from the concept of the present invention, and without departing from the scope of the present invention defined by the attached claims, all of which belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An optical lens with high efficiency and high central field image resolution, characterized in that: include: A first lens, a second lens, a third lens, a fourth lens and an image plane are arranged in sequence, wherein a side of each lens away from the image plane is a first surface, and a side close to the image plane is a second surface; The first lens, the third lens and the fourth lens have positive optical power, and the second lens has negative optical power; The surfaces of the first lens, the second lens and the third lens are aspherical; the Abbe coefficient of the second lens is lower than that of the other three lenses; and the first surface and the second surface of the second lens are both curved toward a side away from the image plane; a vignetting stop disposed on a first surface of the fourth lens element away from the image plane; The aperture stop is disposed on the first surface or the second surface of the first lens, and the distance between the aperture stop and the vignetting stop is 23-50 mm.

2. The optical lens with high efficiency and high central field image resolution according to claim 1, characterized in that: The refractive index and Abbe coefficient of the materials of the first lens, the second lens, the third lens and the fourth lens are all different.

3. The optical lens with high efficiency and high central field image resolution according to claim 1, characterized in that: The surface of the fourth lens is a spherical surface.

4. The optical lens with high efficiency and high central field image resolution according to claim 1, characterized in that: The aperture stop is arranged on a surface of the first lens which is away from the image plane.

5. The optical lens with high efficiency and high central field image resolution according to claim 1, characterized in that: The ratio of the clear aperture L4 of the second surface of the fourth lens facing the image plane to the back focus J1 of the lens group is greater than 2, and the light collection half-angle α of the optical lens for the light source located at the image plane is greater than 35°.

6. The optical lens with high efficiency and high central field image resolution according to claim 1, characterized in that: The refractive index of the fourth lens is greater than the refractive index of the third lens.

7. A light emitting component, characterized in that: It comprises a light source and an optical lens with high efficiency and high central field image resolution as described in any one of claims 1 to 6, wherein the light source is arranged on the image plane.

8. A vehicle, characterized in that: It comprises a vehicle body and the light-emitting assembly as claimed in claim 7, wherein the light-emitting assembly is arranged on the vehicle body.

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