High-efficiency and high-image-quality-resolution optical lens, light-emitting assembly and vehicle

Abstract

The utility model relates to an optical lens with high efficiency and high image quality resolution, a light-emitting assembly and a vehicle. 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, wherein the first lens, the third lens and the fourth lens have positive focal power, and the second lens has negative focal power; 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 aperture diaphragm is arranged on the second lens or between the second lens and the object plane; and the vignetting diaphragm is arranged on the third lens or the fourth lens or between the third lens and the fourth lens. In the embodiment, the aperture diaphragm can limit the clear aperture of the system, so that the illumination efficiency is high; a vignetting diaphragm arranged on the third lens or the fourth lens or between the third lens and the fourth lens improves the image quality by limiting the clear aperture of the large view field; and the optical aberration of the system is corrected and optimized by combining four lenses.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical design field, especially a kind of optical lens, light-emitting assembly and vehicle with high efficiency and high image quality 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 It can be seen that, Figure 1 When the left side split pixel is large, the obstacle is not illuminated, Figure 1 When the right side split pixel is 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 driving at night.

[0004] The high-resolution pixelated lighting device is different from the traditional lighting device for vehicle lamp. It not only needs to provide high illumination efficiency, but also needs to consider the 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 small aperture lens group can well optimize the optical aberration of the system, but a small aperture lens group cannot provide high illumination efficiency; larger aperture has high illumination efficiency, but usually needs 5 or more lens pieces to correct aberration, making the cost higher. UTILITY MODEL CONTENT

[0005] Therefore, it is necessary to provide a kind of optical lens, light-emitting assembly and vehicle with high efficiency and high image quality resolution for at least part of the above problems.

[0006] A kind of optical lens with high efficiency and high image quality resolution, comprising:

[0007] First lens, second lens, third lens, fourth lens and image plane are sequentially arranged, the side of each lens away from the image plane is the first surface, and the side close to the image plane is the second surface;

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

[0009] The Abbe number 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 away from the image plane;

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

[0012] A vignetting stop is arranged at a position between the third lens and the fourth lens;

[0013] The central field of view of the optical lens is greater than 70% of the light passing aperture L1 of the first surface of the first lens at the light exit aperture Z1 of the first surface of the first lens, and the edge field of view is greater than 50% of the light passing aperture L1 of the first surface of the first lens at the light exit aperture B1 of the first surface of the first lens;

[0014] The ratio of the light passing aperture L4 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 a is greater than 35°.

[0015] In some embodiments, the aperture stop is arranged on a surface of the first lens or the second lens.

[0016] In some embodiments, the aperture stop is arranged on a surface of the first lens close to the image plane.

[0017] In some embodiments, the refractive index of the fourth lens is greater than the refractive index of the third lens.

[0018] In some embodiments, the surfaces of the first lens and the second lens are spherical or aspherical, and the surfaces of the third lens and the fourth lens are spherical.

[0019] In some embodiments, the distance L from the first surface of the first lens away from the image plane is not more than 80mm.

[0020] In some embodiments, the half field angle FOV of the lens group is greater than 10.5°, and the aperture range of the first lens is 40-60mm.

[0021] The above optical lens has the following beneficial technical effects:

[0022] The utility model provides a four piece formula low cost, big aperture under the design of lens group of giving consideration to high optical efficiency and good image quality.

[0023] In the embodiment, the aperture stop can limit the system light passing aperture, the central field of view of the lens group is greater than 70% of the light passing aperture L1 of the first surface of the first lens at the light exit aperture Z1 of the first surface of the first lens, and the edge field of view is greater than 50% of the light passing aperture L1 of the first surface of the first lens at the light exit aperture B1 of the first surface of the first lens, and the illumination efficiency is high.

[0024] The ratio of the light passing aperture L4 of the second surface of the fourth lens towards the image plane to the back intercept J1 of the lens group is greater than 2, which can make the lens group have a large light collection angle (half angle α is greater than 35°) for a light source located at the image plane 50, thereby obtaining good illumination efficiency;

[0025] Since the night lighting in the middle of the road is higher than that on both sides of the road, the illumination of the central field of view of the lens group is higher, and the illumination brightness of the edge field of view can be reduced, so that the vignetting diaphragm arranged between the third lens or the fourth lens or the third lens and the fourth lens of the present application improves the image quality by limiting the light passing aperture of the edge field of view. In combination with the 4-piece lens, the optical aberrations such as distortion, spherical aberration, field curvature and the like are corrected and optimized, and better image quality is obtained.

[0026] The pixelated illumination device has high resolution, can more accurately shield the front vehicle area, and has a larger illumination range outside the shielding area. When the divided pixels are small, the obstacle can be illuminated, and the driving is safer. Therefore, the pixel resolution is high, the illumination area can avoid more potential risks, and safer night driving is provided. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a contrast diagram for the pixel segmentation degree and the obstacle illumination degree;

[0028] Figure 2 It is a schematic diagram of the high-efficiency and high-image-quality-resolution optical lens provided by the embodiment of the present application;

[0029] Figure 3 It is Figure 2 It is a schematic diagram of the high-efficiency and high-image-quality-resolution optical lens total length L provided by the embodiment of the present application;

[0030] Figure 4 It is a schematic diagram of the light passing aperture L1 of the first surface of the first lens and the light output aperture Z1 of the central field of view;

[0031] Figure 5 It is a schematic diagram of the light passing aperture L1 of the first surface of the first lens and the light output aperture B1 of the edge field of view;

[0032] Figure 6 It is a schematic diagram of the light passing aperture L4 of the second surface of the fourth lens and the back intercept J1 of the lens group;

[0033] Figure 7 It is a schematic diagram of the light collection angle α of the central field of view of the embodiment;

[0034] Figure 8 It is a schematic diagram of the MTF of the embodiment (0-12.5lp / mm);

[0035] Figure 9 MTF diagram (0-8 lp / mm) for this example embodiment;

[0036] Figure 10 Distortion diagram for this example embodiment;

[0037] In the figure,

[0038] 10, first lens;

[0039] 20, second lens;

[0040] 30, third lens;

[0041] 40, fourth lens;

[0042] 50, image plane;

[0043] 60, aperture stop;

[0044] 70, vignetting stop. DETAILED DESCRIPTION

[0045] The utility model will be described further below with reference to the drawings.

[0046] For the purpose of facilitating understanding of the utility model, the various embodiments defined by the utility model claims will be described more fully below with reference to the relevant drawings. The drawings show the preferred embodiments of the utility model, which contain various specific details to help the understanding, but these details should be regarded as merely exemplary. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. Accordingly, those skilled in the art will recognize that changes and improvements can be made to the various embodiments described herein without departing from the scope of the utility model defined by the appended claims. In addition, the description of well-known functions and configurations can be omitted for the sake of clarity and brevity.

[0047] It will be apparent to those skilled in the art that the following description of various embodiments of the utility model is provided for explanatory purposes only and is not intended to limit the utility model defined by the appended claims.

[0048] Throughout the specification and claims of this application, the words "comprise" and "contain" and variations such as "comprising" and "comprises" and "including" and "includes" and "consist" and "consists" and "consists of" are used in their open-ended sense to mean that the specified component, integer or step is included but not limited to, and that other components, integers or steps can also be present. Features, integers or characteristics described in conjunction with a particular aspect, embodiment or example of the utility model are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith.

[0049] 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.

[0050] 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.

[0051] 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 may 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 may also be an intervening element.

[0052] The terms "up", "down", "left", "right", etc. mentioned in the text are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0053] 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 this invention pertains. 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 art 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.

[0054] like Figures 2-3 As shown, in one embodiment of the present invention, an optical lens with high efficiency and high image resolution is provided, comprising:

[0055] A first lens 10, a second lens 20, a third lens 30, a fourth lens 40 and an image plane 50 are sequentially arranged, wherein the side of each lens away from the image plane 50 is a first surface, and the side close to the image plane 50 is a second surface;

[0056] Wherein the first lens 10, the third lens 30 and the fourth lens 40 have positive optical power, the second lens 20 has negative optical power, the optical power φ represents the refractive power of the optical system to the incident parallel light beam.The greater the value of φ, the more the parallel light beam is folded; When φ>0, the light refraction is convergent; When φ<0, the light refraction is divergent; When φ=0, it corresponds to a plane refraction, at this time, the axial parallel light beam is still an axial parallel light beam after refraction, and no refraction phenomenon occurs;

[0057] The Abbe number of the second lens 20 is lower than that of the other three lenses, and the first surface and the second surface of the second lens 20 are both curved away from the image plane 50;

[0058] The aperture stop 60 is arranged at the position between the first lens 10, the second lens 20, or the first lens 10 and the second lens 20;

[0059] The vignetting stop 70 is arranged at the position between the third lens 30 or the fourth lens 40, or the third lens 30 and the fourth lens 40;

[0060] The central field of view of the optical lens is greater than 70% of the light passing diameter L1 of the first surface of the first lens at the light exit diameter Z1 of the first surface of the first lens, and the edge field of view is greater than 50% of the light passing diameter L1 of the first surface of the first lens at the light exit diameter B1 of the first surface of the first lens.

[0061] The ratio of the light passing diameter L4 of the second surface of the fourth lens to the lens group rear intercept J1 is greater than 2.

[0062] The following table is a set of lens group surface type, position and material parameters of the embodiment of the present application:

[0063]

[0064] The expression of the aspheric lens is as follows:

[0065]

[0066] 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 curvature radius, k is the conic coefficient, and A-J are high-order term coefficients.

[0067] The following table is the aspheric surface type parameter:

[0068]

[0069] In the embodiment, the aperture stop 60 of the system coincides with the position of the second surface of the first lens 10, and the vignetting stop 70 coincides with the position of the first surface of the fourth lens 40. The total length of the lens group of the embodiment is 62.9mm.

[0070] The lens group of the utility model has a high energy collection rate for each field of view. The angle (half angle) of light collected by the central field of view of the specific implementation case 1 is greater than 43 degrees (as shown in the attached figure). Figure 7 ), so the lens group has a high lighting efficiency. If a light source with a luminous angle of 2π is placed on the image plane 50, its energy utilization rate can also be greater than 40%.

[0071] The lens assembly of the utility model has good imaging quality. Figure 8 , the MTF of the specific implementation case is at 12.5lp / mm, the central field of view is greater than 0.85 (corresponding to the curve of the top 0deg in the implementation case), and the edge field of view (corresponding to the curve of the bottom 12deg in the implementation case) is greater than 0.55; reference Figure 9 , MTF is at 8lp / mm, the center field of view is greater than 0.95, and the edge field of view is greater than 0.75.

[0072] MTF is a scientific method to evaluate the resolution of a lens. The closer it is to 1, the better the image quality. Figure 8 The curve for the center field of view (0 degrees) is closer to 1 than the curve for the edge field of view (12 degrees), indicating higher resolution in the center field of view. lp / mm refers to the number of distinct light and dark line pairs within 1 mm. A higher number of line pairs indicates higher resolution.

[0073] refer to Figure 10 , the distortion of the lens assembly of the present invention is no more than 5%.

[0074] The utility model provides a four-piece lens group design with low cost and large aperture, which takes into account both high optical efficiency and good image quality.

[0075] 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 central field of view of the lens group on the first surface of the first lens 10 is larger than 70% of the light-clearing 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-clearing aperture L1 of the surface, so the lighting efficiency is high;

[0076] refer to Figure 6 The ratio of the clear aperture L4 (the aperture of the clear area) of the second surface of the fourth lens 40 on the side 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 on the side close to the image plane 50 and the image plane 50) is greater than 2, which enables 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 43°), thereby obtaining good lighting efficiency.

[0077] Because the requirement for night lighting in the middle of the road is higher than that on both sides of the road, the lighting requirement for the central field of view of the lens group is higher, and the lighting brightness of the edge field of view can be reduced, therefore, the vignetting diaphragm 70 provided between the third lens 30 or the fourth lens 40 or the third lens 30 and the fourth lens 40 improves the image quality by limiting the light aperture of the edge field of view, that is, the vignetting diaphragm 70 is provided to improve the image quality by sacrificing the lighting of the edge field of view. In combination with the 4 lenses, the optical aberrations such as distortion, spherical aberration, and field curvature are corrected and optimized, and better image quality is obtained.

[0078] The pixelated lighting device has high resolution, can more accurately shield the front vehicle area, and has a larger lighting range outside the shielding area. Figure 1 It can be seen that when the divided pixels are small, the obstacles can be illuminated and the driving is safer, and therefore the pixel resolution is high, the lighting area can avoid more potential risks, and safer driving at night is provided.

[0079] In some embodiments, the aperture diaphragm 60 is arranged on the surface of the first lens 10 and the second lens 20. The aperture diaphragm 60 is used to limit the light aperture of the system. If it is arranged at a position between the first lens 10 and the second lens 20 or a position between the first lens 10 and the object plane, an additional light shielding component needs to be additionally arranged. When the aperture diaphragm 60 is arranged on the surface of the lens, the area outside the aperture of the lens is not illuminated, and therefore the aperture of the lens itself determines the light aperture, and no additional device needs to be arranged, which can greatly save costs.

[0080] Reference Figure 3 In some embodiments, the aperture diaphragm 60 is arranged on the surface of the first lens 10 close to 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 turn and is finally emitted from the first lens 10. Arranging the aperture diaphragm 60 on the surface of the first lens 10 close to the image plane 50 can make the light aperture of each field of view passing through the first lens 10 as large as possible, that is, more light is emitted, thereby obtaining higher lighting efficiency.

[0081] Referring to the drawings, 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 passes through the fourth lens 40 first, and the higher refractive index has stronger deflection energy on the light, which can collect more energy emitted by the light source into the lens group, so that the lighting efficiency of the lens group is higher. Therefore, it is preferred to apply a material with a higher refractive index than the third lens 30 to the fourth lens 40.

[0082] In some embodiments, the surfaces of the first lens 10 and the second lens 20 can be spherical or aspherical, and the surfaces of the third lens 30 and the fourth lens 40 are spherical. Since the third lens and the fourth lens are made of glass, the processing cost of the spherical surface is much lower than that of the aspherical surface. Therefore, the lens group can have better cost control.

[0083] In some embodiments, the refractive index and the Abbe number of the first lens, the second lens, the third lens and the fourth lens are different. The lenses with different characteristics cooperate with each other to make the chromatic aberration smaller. Through actual test, the four lenses with different Abbe numbers can better balance the chromatic aberration of the lens group.

[0084] In some embodiments, an antireflection film can be 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 antireflection film reduces the energy loss caused by Fresnel reflection when the light passes through the lens surface, thereby improving the illumination efficiency of the system.

[0085] 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 80 mm, preferably less than 65 mm. Compared with the traditional illumination optical system, the longitudinal depth is smaller, which is more advantageous for arranging in a lamp with limited space.

[0086] In some embodiments, the half field angle FOV of the lens group is greater than 10.5°. The lens group has a wider field angle FOV, and the half FOV of the embodiment is 12 deg, which makes the illumination range larger and improves the safety of driving. The illumination device with the lens group can provide more illumination 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 illumination to the curve is larger.

[0087] In some embodiments, the aperture of the first lens 10 ranges from 40 to 60 mm. An aperture smaller than 40 mm cannot obtain a higher system illumination efficiency, and an aperture larger than 60 mm affects the lens group to obtain a better image resolution.

[0088] A light emitting assembly includes a light source and the optical lens with high efficiency and high image resolution as described above, and the light source is arranged on the image plane 50.

[0089] A vehicle includes a vehicle body and the light emitting assembly as described above, and the light emitting assembly is arranged on the vehicle body.

[0090] In the above description, although expressions such as "first" and "second" can be used to describe various elements of the present application, 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.

[0091] The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular expression includes the plural expression, unless there is a significant difference in context or scheme.

[0092] The above description is only an exemplary embodiment of the present application, and is not intended to limit the scope of protection of the present application, which is determined by the appended claims.

[0093] 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 technical features in the above-described embodiments are described, however, as long as the combination of technical features does not exist, and the simple transformation mode and adaptive and functional structure transformation scheme of the prior art can be conceived by those skilled in the art, it should be considered within the scope of the present application.

[0094] The above-described embodiments only express several embodiments of the present application, which are described in detail, but should not be construed as limiting the scope of the present application. It should be noted that, although the present application has been shown and described with reference to various embodiments, those skilled in the art can make a number of forms and details of various modifications and improvements without departing from the concept of the present application, and these all belong to the scope of the present application defined by the appended claims. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. An optical lens with high efficiency and high 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 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; an aperture stop, provided on the first lens, the second lens, or between the first lens and the second lens; a vignetting stop, disposed on the third lens element or the fourth lens element or between the third lens element and the fourth lens element; The optical lens has a central field of view, a light exit aperture Z1 on the first surface of the first lens that is greater than 70% of the light-clearing aperture L1 of the surface, and a peripheral field of view, a light exit aperture B1 on the first surface of the first lens that is greater than 50% of the light-clearing aperture L1 of the surface; 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 is greater than 35°.

2. The optical lens with high efficiency and high image resolution according to claim 1, characterized in that: The aperture stop is arranged on the surface of the first lens or the second lens.

3. The optical lens with high efficiency and high image resolution according to claim 1, wherein: The aperture stop is arranged on a surface of the first lens close to the image plane.

4. The optical lens with high efficiency and high image resolution according to claim 1, wherein: The refractive index of the fourth lens is greater than the refractive index of the third lens.

5. The optical lens with high efficiency and high image resolution according to claim 1, wherein: The surfaces of the first lens and the second lens are spherical or aspherical, and the surfaces of the third lens and the fourth lens are spherical.

6. The optical lens with high efficiency and high image resolution according to claim 1, wherein: A distance L between a first surface of the first lens facing away from the image plane and the image plane does not exceed 80 mm.

7. The optical lens with high efficiency and high image resolution according to claim 1, wherein: The half field of view (FOV) of the lens group is greater than 10.5°, and the aperture of the first lens is in the range of 40 to 60 mm.

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

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

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