High-efficiency optical lens with high central field-of-view image resolution and light-emitting assembly

Abstract

The utility model relates to an optical lens with high efficiency and high central field-of-view image resolution and a light-emitting assembly. 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 utility model relates to optical design field, especially a kind of optical lens and luminous assembly of high efficiency, high central field of view image resolution. BACKGROUND

[0002] The device for vehicle lamp in traditional technology can provide good illumination at night, but when the oncoming or same direction vehicle appears in front of the driver, it may cause the glare of the opposite driver and cause safety hazards.

[0003] The pixelated lighting lamp can solve the above problems, mainly by identifying the position of the front vehicle and shielding the vehicle position to avoid glare, while the area outside the front vehicle is still well illuminated. The higher the resolution of the pixelated lighting device, the more accurately the front vehicle area can be shielded, making the illumination range outside the shielded area larger, from the attached Figure 1 As can be seen, when the segmented pixels are large, the obstacle is not illuminated, and when the segmented pixels are small, the obstacle can be illuminated and the driving is safer, so the pixel resolution is high, the illumination area can avoid more potential risks and provide safer night driving.

[0004] The high-resolution pixelated lighting device is different from the traditional lighting device for vehicle lamp, which not only needs to provide high illumination efficiency, but also needs to consider 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. Generally, a smaller aperture lens group can well optimize the optical aberration of the system, but a smaller aperture lens group cannot provide high illumination efficiency; a larger aperture has high illumination efficiency, but usually needs 5 or more lens pieces to correct aberration, making the cost higher. In addition, the existing pixelated lighting device has large lateral chromatic aberration and the image resolution of the central field of view is not high enough compared to the edge field of view. SUMMARY

[0005] Therefore, it is necessary to provide a high-efficiency optical lens and luminous assembly with high central field of view image resolution to solve at least part of the above problems.

[0006] A high-efficiency optical lens with high central field of view image resolution, comprising:

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

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

[0009] The surface of the first lens, the second lens and the third lens is aspherical; and the Abbe number of the second lens is lower than that of the other three lenses.

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

[0011] The aperture stop is arranged at the position between the first lens and the second lens.

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

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

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

[0015] In some embodiments, the aperture stop is arranged at the side surface of the first lens facing away from the image plane.

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

[0017] In some embodiments, the vignetting stop is arranged at the first surface of the fourth lens facing away from the image plane, the aperture stop is arranged at 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 that of the third lens.

[0019] The optical lens with high efficiency and high image resolution in the central field of view has at least the following beneficial technical effects:

[0020] In the embodiment, the aperture stop arranged at the first surface or the second surface of the first lens can limit the system clear aperture, the light exit aperture Z1 of the lens group in the central field of view at the first surface of the first lens is greater than 70% of the clear aperture L1 of the surface, the light exit aperture B1 of the lens group in the edge field of view at the first surface of the first lens is greater than 50% of the clear aperture L1 of the surface, and the illumination efficiency is high.

[0021] The vignetting stop arranged at the first surface of the fourth lens away from the image plane in the application can improve the image quality by limiting the clear aperture of the large field of view; and the four lenses are combined to correct and optimize the optical aberrations of the system, such as distortion, spherical aberration, field curvature, etc., so that better image quality is obtained.

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

[0023] The pixelated lighting device of the present application has high resolution, can more accurately shield the area of the front vehicle, and makes the lighting range outside the shielding area larger, so that the driver can see the road more clearly. Figure 1 It can be seen that when the divided pixels are small, the obstacles can be illuminated, and the driving is safer, so the pixel resolution is high, the lighting area can avoid more potential risks, and safer driving at night is provided.

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

[0025] Figure 1 It is a schematic view for comparison between the pixel segmentation degree and the obstacle illumination degree;

[0026] Figure 2 It is a schematic view of the optical lens provided by the embodiment of the present application, which has high efficiency and high image resolution of central field of view;

[0027] Figure 3 It is a schematic view of the optical lens provided by the embodiment of the present application, which has high efficiency and high image resolution of central field of view; Figure 2 It is a schematic view of the optical lens provided by the embodiment of the present application, which has high efficiency and high image resolution of central field of view;

[0028] Figure 4 It is a schematic view of the optical lens provided by the embodiment of the present application, which has high efficiency and high image resolution of central field of view;

[0029] Figure 5 It is a schematic view of the optical lens provided by the embodiment of the present application, which has high efficiency and high image resolution of central field of view;

[0030] Figure 6 It is a schematic view of the optical lens provided by the embodiment of the present application, which has high efficiency and high image resolution of central field of view;

[0031] Figure 7 It is a schematic view of the MTF of the embodiment (0-12.5lp / mm);

[0032] Figure 8 It is a schematic view of the MTF of the embodiment (0-8lp / mm);

[0033] Figure 9 It is a distortion diagram of the embodiment;

[0034] Figure 10 It is a schematic view of the optical lens provided by the embodiment of the present application, which has high efficiency and high image resolution of central field of view;

[0035] Figure 11 It is a schematic view of the optical lens provided by the embodiment of the present application, which has high efficiency and high image resolution of central field of view; Figure 10A schematic diagram showing the aperture stop, vignetting stop, and the total length L of the optical lens.

[0036] Figure 12 for Figure 10 A schematic diagram of the light-passing aperture L1 of the first surface of the first lens and the light-exiting aperture Z1 of the central field of view;

[0037] Figure 13 for Figure 10 A schematic diagram of the light-passing aperture L1 and the light-exiting aperture B1 of the first surface of the first lens;

[0038] Figure 14 for Figure 10 A schematic diagram of the light-transmitting aperture L4 of the second surface of the fourth lens and the back intercept J1 of the lens group;

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

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

[0041] Figure 17 for Figure 10 MTF schematic diagram of an embodiment (0-8 lp / mm);

[0042] Figure 18 for Figure 10 The distortion diagram of the embodiment;

[0043] Figure 19 for Figure 10 The lateral color difference curve of the embodiment;

[0044] In the picture,

[0045] 10. First lens;

[0046] 20. Second lens;

[0047] 30. The third lens;

[0048] 40. The fourth lens;

[0049] 50. Like a face;

[0050] 60. Aperture stop;

[0051] 70. Gradually becoming hazy. Detailed Implementation

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

[0053] For the purpose of clarity and a concise description, descriptions of well-known functions and constructions can be omitted so as not to obscure the understanding of this application.

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

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

[0056] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. The terms "comprises," "comprising," "includes," and / or "including," as used herein, are meant to be interpreted in an inclusive, non-exclusive manner, i.e., they are meant to allow for the possibility that the subject matter being described might include additional elements than those recited. Furthermore, the terms "comprise" and / or "have" are meant to be interpreted in an inclusive, non-exclusive manner, i.e., they are meant to allow for the possibility that the subject matter being described might include additional features, quantities, operations, elements and / or components, or combinations thereof.

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

[0058] It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present; and when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present.

[0059] The terms "up," "down," "left," and "right" mentioned in the text are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

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

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

[0062] The first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the image plane 50 are arranged in sequence. The side of each lens away from the image plane 50 is the first surface, and the side closer to the image plane 50 is the second surface.

[0063] The first lens 10, the third lens 30, and the fourth lens 40 have positive optical power, while the second lens 20 has negative optical power. Optical power φ characterizes the refractive power of the optical system for an incident parallel beam of light. The larger the value of φ, the more pronounced the refraction of the parallel beam; when φ > 0, the refraction is converging; when φ < 0, the refraction is diverging. When φ = 0, it corresponds to plane refraction; in this case, the axial parallel beam remains axially parallel after refraction, and no refraction occurs.

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

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

[0066] Specifically, in one embodiment, the vignetting stop 70 is placed 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 23-50mm. In this case, the aperture stop 60 is placed on the first or 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 this utility model:

[0067]

[0068] The expression for an aspherical lens is as follows:

[0069]

[0070] 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 to J are coefficients of higher-order terms.

[0071] The following table shows the aspherical 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, and the vignetting stop 70 is placed on the first surface of the fourth lens 40. 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 this utility model has a high energy collection efficiency in each field of view. In specific implementation example one, the light angle (half-angle) collected in the center field of view is greater than 48 degrees (as shown in the attached figure). Figure 3 Therefore, this lens group has high illumination efficiency. If a light source with a emission angle of 2π is placed on the image plane 50, its energy utilization rate can also be greater than 40%.

[0076] The lens assembly described in this invention has excellent image quality in its central field of view. (Reference) Figure 7 In specific embodiment one, the MTF is 12.5 lp / mm, and the central field of view is greater than 0.92 (corresponding to the uppermost 0-degree curve in the implementation case); see reference. Figure 8 At an MTF of 8 lp / mm, the central field of view is greater than 0.96 (corresponding to the curve at the top of the figure with a depth of 0 degrees).

[0077] MTF is a scientific method for evaluating lens resolution; 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), meaning the center field of view has higher resolution. lp / mm refers to the number of light and dark line pairs that can be clearly seen within 1mm; a higher number of line pairs indicates higher resolution.

[0078] refer to Figure 9 The distortion of the lens assembly described in this utility model is no more than 5%.

[0079] This invention provides a four-element, low-cost lens assembly design that combines high optical efficiency and good image quality with a large aperture.

[0080] In this embodiment, the aperture stop 60 can limit the light transmission aperture of the system, as referenced. Figure 4 , Figure 5 The light-emitting aperture Z1 of the center field of view of the lens group is more than 70% greater than the light-transmitting aperture L1 of the first surface of the first lens 10, and the light-emitting aperture B1 of the edge field of view of the first surface of the first lens 10 is more than 50% greater than the light-transmitting aperture L1 of the first surface, resulting in high illumination efficiency.

[0081] If the aperture stop 60 is not located on the surface of the first lens 10, additional components for light blocking are required. However, by placing the aperture stop 60 on the surface of the first lens, the area outside the lens aperture is not light-transmitting. Therefore, the lens itself determines the aperture diameter, eliminating the need for additional components and significantly reducing costs.

[0082] Because the requirements for nighttime lighting in the middle of the road are higher than those on the sides, the illumination requirements for the central field of view of the lens group are higher, while the illumination brightness of the peripheral field of view can be reduced. Therefore, this application places a vignetting stop 70 on the first surface of the fourth lens 40, which is far from the image plane, to improve image quality by limiting the light transmission aperture of the peripheral field of view. Combined with the four lenses, optical aberrations of the system, such as distortion, spherical aberration, and field curvature, are corrected and optimized to obtain better image quality.

[0083] The lens assembly described in this invention has a semi-field of view (FOV) of 12.8 degrees, which provides a wider illumination range and improves driving safety. When a vehicle enters a curve, the lighting device equipped with this lens assembly can provide more illumination to one side of the curve, enhancing driving safety. The larger FOV of the lens assembly means a wider range of illumination provided towards the curve.

[0084] This application's pixelated lighting device has high resolution, enabling more precise masking of the area in front of vehicles, resulting in a larger illumination range outside the masked area. Figure 1 As can be seen, when the number of pixels is large, obstacles are not illuminated, while when the number of pixels is small, obstacles can be illuminated, making driving safer. Therefore, high pixel resolution allows the illuminated area to avoid more potential risks, providing safer driving at night.

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

[0086] Xangle Yangle VDX VDY VCX VCY central 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] The field of view and entrance pupil of the optical system can be normalized to a unit circle, such as the pupil coordinate (px=0, py=1) refers to the position from the edge of the y direction in the field of view. The VDX term in the table above moves the center of the pupil in the x direction, and the VCX term makes the pupil larger or smaller in the x direction; the VDY term moves the center of the pupil in the y direction, and the VCY term makes the pupil larger or smaller in the y direction. That is, the vignetting factor changes the original Px and Py, and the changed Px', Py' satisfies the following calculation formula:

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

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

[0090] See the lens group x and y directions Figure 12 schematic.

[0091] For lens groups, if the chromatic aberration is large, the lens group will also have color when used for vehicle lighting or projection patterns. The commonly used vehicle module adopts a single lens, and the chromatic aberration of the single lens is large, so when used for lighting, color dispersion will occur, such as blue at the near light cutoff line, which will cause discomfort to the driver. Referring to Figure 10 , another embodiment is provided, which has high central field of view image quality and efficiency, and also has excellent lateral chromatic aberration.

[0092] The following table is the lens group surface type, position and material parameters of this embodiment:

[0093]

[0094]

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

[0096]

[0097] Wherein, z is the sag of the aspheric surface at position r, c is the paraxial curvature of the aspheric surface, c = 1 / r, r is the radius of curvature, k is the conic coefficient, and A-J are high-order term coefficients.

[0098] The following table is the aspheric surface type parameters:

[0099]

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

[0101] The lens assembly in this implementation case has a high energy harvesting efficiency across all fields of view, with the angle (half-angle) of the light rays collected in the central field of view being greater than 46 degrees (as shown in the attached diagram). Figure 15 Therefore, this lens group has high illumination efficiency. If a light source with a emission angle of 2π is placed on the image plane 50, its energy utilization rate can also be greater than 40%.

[0102] The lens assembly described in this invention has excellent image quality. (Reference) Figure 16 In the specific implementation case, the MTF is 12.5 lp / mm, and the center field of view is greater than 0.83 (corresponding to the top 0-deeg curve in the implementation case figure); Reference Figure 17 The MTF is 8 lp / mm, and the central field of view is greater than 0.93.

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

[0104] refer to Figure 18 The distortion of the lens assembly described in this utility model is no greater than 5%; Reference Figure 19 The lateral chromatic aberration of the lens assembly described in this invention does not exceed 1.1 μm. This application's multi-lens chromatic aberration correction capability is strong; therefore, when used as vehicle module lighting or projected patterns, there will be no chromatic aberration at the edges of the graphics, avoiding driver discomfort.

[0105] In this embodiment, the aperture stop 60 can limit the light transmission aperture of the system, as referenced. Figure 12 , Figure 13 The light-emitting aperture Z1 of the center field of view of the lens group is more than 70% greater than the light-transmitting aperture L1 of the first surface of the first lens 10, and the light-emitting aperture B1 of the edge field of view of the first surface of the first lens 10 is more than 50% greater than the light-transmitting aperture L1 of the first surface, resulting in high illumination efficiency.

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

[0107] refer to Figure 14The ratio of the light passing aperture L4 (the aperture of the light passing area) of the second surface of the fourth lens 40 on the side towards the image plane 50 to the lens group back intercept J1 (the distance between the center of the second surface of the fourth lens 40 on the side towards the image plane 50 and the image plane 50) is greater than 2, which can make the lens group have a larger light collection angle (for example, the half angle a is greater than 35°) for the light source located at the image plane 50, thereby obtaining good illumination efficiency.

[0108] In some embodiments, the refractive indexes and Abbe numbers of the first lens, the second lens, the third lens and the fourth lens are different. The lenses with different properties cooperate with each other to make the chromatic aberration smaller, and through actual tests, the four lenses with different Abbe numbers 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 a glass material which has better temperature resistance. For glass, the processing cost of a spherical surface is much lower than that of a non-spherical surface, so the spherical surface design reduces the cost, and the lens group of the utility model can have better cost control.

[0110] Reference Figure 3 In some embodiments, the aperture stop 60 is arranged on the surface of the first lens 10 away from the image plane 50. When the lens group is used for 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. Arranging the aperture stop 60 on the surface of the first lens 10 away from the image plane 50 can make the light passing aperture of each field of view at the first lens 10 as large as possible, that is, more light exits, thereby obtaining higher illumination efficiency.

[0111] Reference Figure 6 and Figure 14 In some embodiments, the ratio of the light passing aperture L4 (the aperture of the light passing area) of the second surface of the fourth lens 40 on the side towards the image plane 50 to the lens group back intercept J1 (the distance between the center of the second surface of the fourth lens 40 on the side towards the image plane 50 and the image plane 50) is greater than 2, which can make the lens group have a larger light collection angle (for example, the half angle a is greater than 35°) for the light source located at the image plane 50, thereby obtaining good illumination efficiency. Figure 3 the half angle a is 48°), thereby obtaining good illumination efficiency.

[0112] In some embodiments, the refractive index of the fourth lens 40 is greater than that of the third lens 30, when the lens group is used for vehicle lighting, the light source is arranged 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 is preferentially passed through the fourth lens 40, the high refractive index has a stronger deflection energy on the light, and more energy emitted by the light source can be collected into the lens group, so that the lighting efficiency of the lens group is higher, and therefore a material with a higher refractive index than the third lens 30 is preferably applied to the fourth lens 40.

[0113] In some embodiments, an antireflection film is arranged 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 antireflection film reduces the energy loss caused by Fresnel reflection when the light passes through the lens surface, thereby improving the lighting efficiency of the system.

[0114] Reference Figure 3 In some embodiments, the distance L from the first surface of the first lens 10 away from the image plane 50 to the image plane 50 is not more than 80mm, and is preferably less than 65mm, which has a smaller depth compared to a traditional lighting optical system, and is more advantageous for arrangement 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 has a wider field of view FOV, and the half FOV of the implementation case is not less than 12deg, which makes the lighting range larger and improves the safety of driving. The lighting device carrying the lens group can provide more lighting to one side of the curve when the vehicle enters the curve, thereby improving the safety of driving. The lens group provides a larger FOV, which means that the range of providing more lighting to the curve is larger.

[0116] In some embodiments, the aperture of the first lens 10 ranges from 40mm to 60mm. An aperture smaller than 40mm cannot obtain a higher system lighting efficiency, and an aperture greater than 60mm affects the lens group to obtain a better image resolution.

[0117] A light-emitting assembly includes a light source and the optical lens with high efficiency and high central field of view image resolution, and the light source is arranged at the image plane 50.

[0118] A vehicle includes a vehicle body and the light-emitting assembly arranged at the vehicle body.

[0119] In the above description, although expressions such as "first" and "second" can be used to describe various elements of the utility model, 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.

[0120] The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments, and are not intended to limit the utility model. The singular expression contains the plural expression, unless there is a significant difference in context, scheme.

[0121] The above is only the exemplary embodiment of the utility model, and is not used to limit the protection scope of the utility model, and the protection scope of the utility model is determined by the appended claims.

[0122] Those skilled in the art can understand that the technical features of the above-described embodiments can be omitted, added or combined in any way, in order to make the description simple, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combination of the technical features does not exist contradictory, and the simple transformation mode and the adaptive and functional structure transformation scheme of the prior art that the person skilled in the art can think of, should be considered as the scope of the present application.

[0123] The above-described embodiments only express several embodiments of the utility model, and the description is more specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be pointed out that although the utility model has been shown and described with reference to various embodiments, for those skilled in the art, without departing from the concept of the utility model, a number of forms and details can be made, and the scope of the utility model defined by the appended claims is not deviated, which belongs to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An optical lens having high efficiency and high resolution in a central field of view, characterized in that, Comprise: First lens, second lens, third lens, fourth lens and image plane arranged in sequence, each lens away from the side of the image plane is the first surface, close to the side of the image plane is the second surface; Wherein the first lens, the third lens and the fourth lens have positive refractive power, the second lens has negative refractive power; The surface of the first lens, the second lens, the third lens is aspherical surface; The Abbe number 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 curved away from the image plane; Vignetting diaphragm, placed in the fourth lens away from the first surface of the image plane; Aperture diaphragm, placed in the first surface or the second surface of the first lens, and the distance between the aperture diaphragm and the vignetting diaphragm is 23-50mm.

2. The optical lens of claim 1, wherein, The material refractive index and Abbe number of the first lens, the second lens, the third lens and the fourth lens are different.

3. The optical lens of claim 1, wherein, The surface of the fourth lens is spherical.

4. The optical lens of claim 1, wherein, The aperture diaphragm is arranged on the surface of the first lens away from the image plane.

5. The optical lens of claim 1, wherein, The ratio of the second surface of the fourth lens to the lens group rear intercept J1 is greater than 2, and the light collection half angle α of the optical lens to the light source located at the image plane is greater than 35°.

6. The optical lens of claim 1, wherein, The refractive index of the fourth lens is greater than that of the third lens.

7. A light emitting assembly characterized in that, Comprise light source and high efficiency, high central field of view image resolution optical lens as claimed in any one of claims 1-6, the light source is arranged on the image plane.

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