Pixel projection lens and automobile

Abstract

The utility model discloses a pixel projection lens and an automobile, and relates to the technical field of automobile illumination, the pixel projection lens is provided with an object side and an image side which are correspondingly arranged along the direction of an optical axis, the pixel projection lens comprises a first lens, a second lens, a third lens, a fourth lens and an image surface which are sequentially arranged from the object side to the image side, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the pixel projection lens meets the following conditions: 10lt; f1lt; 20; -6 lt; f2lt; f2lt; -14.5,-14.5,-14.5; 30 lt; f3lt; f3t; 40); 35 lt; f4lt; f4t; 50; the first lens and the second lens are aspheric lenses, and the third lens and the fourth lens are glass spherical lenses. By means of the arrangement, the pixel projection lens is good in imaging quality and good in stability and can not defocus under the environment condition of-40 DEG C to 105 DEG C, and therefore it is fully guaranteed that the pixel projection lens works stably in the environment with the large temperature difference.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile lighting, in particular to a pixel projection lens and an automobile. Background Art

[0002] With the rapid development of automotive lighting technology, consumers are demanding increasingly higher standards for headlights. In particular, the integration of lighting and projection technologies is making automotive headlights more intelligent and technologically advanced. Pixel headlights have become a trend in automotive lighting development. They primarily utilize MicroLEDs as light emitters, equipped with an optical lens system to efficiently collect and image the emitted light. Projecting illumination through the lens module achieves high-brightness, high-definition illumination of specific areas, while also achieving imaging with low chromatic aberration and distortion. In conjunction with the development of MicroLEDs, improving light collection efficiency, miniaturization, and cost reduction are key design challenges for these lenses.

[0003] Traditional solutions mainly adopt multi-piece glass structures, most of which have small apertures. In order to meet the projection lighting effect, a large number of glass lenses are used, resulting in large lens size and high cost. Utility Model Content

[0004] The main purpose of the utility model is to provide a pixel projection lens and a car, aiming to improve the problem that the existing vehicle headlight lens has a large number of lenses, resulting in large lens size and high cost.

[0005] To achieve the above-mentioned objectives, the present invention provides a pixel projection lens, which has an object side and an image side correspondingly arranged along the optical axis. The pixel projection lens includes, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and an image plane. The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4. The pixel projection lens satisfies the following conditions:

[0006] 10 <f1<20;-6<f2<-14.5;30<f3<40;35<f4<50;

[0007] The first lens and the second lens are aspherical lenses, and the third lens and the fourth lens are glass spherical lenses.

[0008] In one embodiment, the first lens is a positive lens, the object-side surface of the first lens is convex, and the image-side surface is convex;

[0009] The second lens is a negative lens, and the object-side surface and image-side surface of the second lens are concave;

[0010] The third lens is a positive lens, and the object-side surface and image-side surface of the third lens are convex;

[0011] The fourth lens is a positive lens, the object-side surface of the fourth lens is convex, and the image-side surface is concave.

[0012] In one embodiment, the refractive index of the first lens is n1, 1.4≤n1≤1.6;

[0013] The refractive index of the second lens is n2, 1.5≤n2≤1.7;

[0014] The refractive index of the third lens is n3, 1.6≤n3≤1.9;

[0015] The refractive index of the fourth lens is n4, 1.55≤n4≤1.8.

[0016] In one embodiment, the Abbe coefficient of the first lens is v1, 50≤v1≤68;

[0017] The dispersion coefficient of the second lens is v2, 20≤v2≤40;

[0018] The Abbe coefficient of the third lens is v3, 50≤v3≤68;

[0019] The Abbe coefficient of the fourth lens is v4, 50≤v4≤68.

[0020] In one embodiment, the distance between the object-side end of the first lens and the image plane is set to TTL, and the effective focal length of the pixel projection lens is EFL, wherein TTL / EFL≤2.5.

[0021] In one embodiment, the aperture value of the pixel projection lens is F, 0.5≤F≤1.0.

[0022] In one embodiment, the pixel projection lens further includes an aperture, and the aperture is disposed between the first lens and the second lens.

[0023] In one embodiment, the pixel projection lens further includes a light emitting body, wherein the light emitting body is spaced apart and arranged on the image side of the fourth lens, and an end surface of the light emitting body facing the object side serves as the image plane.

[0024] In one embodiment, the diameter of the image plane of the light-emitting body is IC, and IC≤13.2 mm.

[0025] The utility model also provides a car, comprising the above-mentioned pixel projection lens.

[0026] In the technical solution of the present invention, the first lens and the second lens are aspherical lenses. Aspherical lenses have better curvature radius characteristics and have the advantages of improving distortion aberration and astigmatism aberration. After adopting aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. At the same time, the use of plastic aspherical lenses can also reduce the manufacturing cost of the pixel projection lens. The third lens and the fourth lens are glass spherical lenses. Glass lenses can effectively resist the problem of lens deformation due to heat, reduce the impact of temperature on the optical performance of the lens, and maintain the high precision of the lens for a long time. By combining the materials and distributing the surface shapes of the multiple lenses of the pixel projection lens and reasonably controlling the focal lengths of the first lens, the second lens, the third lens, and the fourth lens, the manufacturing cost of the pixel projection lens is reduced while the imaging quality and stability of the pixel projection lens are improved. The lens can remain focused under environmental conditions of -40°C to 105°C, thereby fully ensuring the stable operation of the pixel projection lens in an environment with large temperature differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a structural diagram of an embodiment of a pixel projection lens provided by the present invention;

[0029] Figure 2 for Figure 1 MTF diagram of an embodiment of a pixel projection lens in FIG;

[0030] Figure 3 for Figure 1 Schematic diagram of MTF of another embodiment of the pixel projection lens in FIG.

[0031] Description of Figure Numbers:

[0032] 100. Pixel projection lens; 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Aperture; 6. Light-emitting body.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0037] The present invention provides a pixel projection lens, aiming to improve the problems of large lens size and high cost caused by the large number of lens lenses in existing vehicle headlights.

[0038] Please refer to Figure 1 , in an embodiment of the present invention, the pixel projection lens 100 has an object side and an image side arranged corresponding to each other along the optical axis direction. The pixel projection lens 100 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and an image plane in sequence from the object side to the image side. The focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, the focal length of the third lens 3 is f3, the focal length of the fourth lens 4 is f4. The pixel projection lens 100 satisfies the following conditions: 10 < f1 < 20; -6 < f2 < -14.5; 30 < f3 < 40; 35 < f4 < 50; The first lens 1 and the second lens 2 are aspherical lenses, and the third lens 3 and the fourth lens 4 are glass spherical lenses.

[0039] In the technical solution of the present invention, the first lens 1 and the second lens 2 are aspherical lenses. Aspherical lenses have better curvature radius characteristics and have the advantages of improving distortion aberration and astigmatism aberration. After using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. At the same time, the use of plastic aspherical lenses can also reduce the manufacturing cost of the pixel projection lens 100. The third lens 3 and the fourth lens 4 are glass spherical lenses. Glass lenses can effectively resist the problem of lens deformation due to heat, reduce the impact of temperature on the optical performance of the lens, and maintain the high precision of the lens for a long time. By combining the materials and distributing the surface shapes of the multiple lenses of the pixel projection lens 100, and rationally controlling the focal lengths of the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4, the manufacturing cost of the pixel projection lens 100 is reduced while ensuring that the pixel projection lens 100 has good imaging quality and stability. It can remain in focus under environmental conditions of -40°C to 105°C, thereby fully ensuring the stable operation of the pixel projection lens 100 in environments with large temperature differences.

[0040] It can be understood that in the embodiment of the present invention, the first lens 1 and the second lens 2 are configured as aspherical lenses, and the third lens 3 and the fourth lens 4 are configured as glass spherical lenses. This can further reduce the impact of the high temperature on the image side of the pixel projection lens 100 on the imaging of the first lens 1 and the second lens 2, thereby ensuring clear imaging of the pixel projection lens 100.

[0041] It should be noted that the present invention does not limit the specific values ​​of the focal length f1 of the first lens 1, the focal length f2 of the second lens 2, the focal length f3 of the third lens 3, and the focal length f4 of the fourth lens 4. The focal length f1 of the first lens 1, the focal length f2 of the second lens 2, the focal length f3 of the third lens 3, and the focal length f4 of the fourth lens 4 can be set to any value within the corresponding range, and the present invention does not impose any restrictions on this. In actual settings, you can select according to your needs.

[0042] Furthermore, in an embodiment of the present invention, the first lens 1 is a positive lens, with the object-side surface and the image-side surface being convex; the second lens 2 is a negative lens, with the object-side surface and the image-side surface being concave; the third lens 3 is a positive lens, with the object-side surface and the image-side surface being convex; and the fourth lens 4 is a positive lens, with the object-side surface and the image-side surface being convex. This arrangement ensures the imaging quality of the pixel projection lens 100 through the rational matching of the four lens faces.

[0043] Furthermore, in the present invention, the refractive index of the first lens 1 is n1, 1.4≤n1≤1.6, the refractive index of the second lens 2 is n2, 1.5≤n2≤1.7, the refractive index of the third lens 3 is n3, 1.6≤n3≤1.9, and the refractive index of the fourth lens 4 is n4, 1.55≤n4≤1.8.

[0044] Likewise, the present invention does not limit the refractive index of the first lens 1 , the refractive index of the second lens 2 , the refractive index of the third lens 3 , and the refractive index of the fourth lens 4 .

[0045] It should be noted that, in the embodiment of the present invention, the refractive index n1 of the first lens 1, the refractive index n2 of the second lens 2, the refractive index n3 of the third lens 3, and the refractive index n4 of the fourth lens 4 can be set to any value within the corresponding range. The present invention does not impose any restrictions on this. In actual settings, they can be selected according to needs.

[0046] In addition, in another embodiment of the present invention, the dispersion coefficient of the first lens 1 is v1, 50≤v1≤68, the dispersion coefficient of the second lens 2 is v2, 20≤v2≤40, the dispersion coefficient of the third lens 3 is v3, 50≤v3≤68, and the dispersion coefficient of the fourth lens 4 is v4, 50≤v4≤68.

[0047] The present invention also does not limit the Abbe coefficient v1 of the first lens 1 , the Abbe coefficient v2 of the second lens 2 , the Abbe coefficient v3 of the third lens 3 , and the Abbe coefficient v4 of the fourth lens 4 .

[0048] Similarly, in the embodiment of the present invention, the dispersion coefficient v1 of the first lens 1, the dispersion coefficient v2 of the second lens 2, the dispersion coefficient v3 of the third lens 3, and the dispersion coefficient v4 of the fourth lens 4 can be set to any value within the corresponding range. The present invention does not impose any restrictions on this. In actual settings, they can be selected according to needs.

[0049] In one embodiment of the present invention, the distance between the object-side end of the first lens 1 and the image plane is set to TTL, and the effective focal length of the pixel projection lens 100 is EFL, wherein TTL / EFL≤2.5.

[0050] In a further embodiment of the present invention, the aperture value of the pixel projection lens 100 is F, 0.5≤F≤1.0. This configuration enables the pixel projection lens 100 to have a large light transmission, thereby achieving excellent image brightness, thereby further improving the imaging quality of the pixel projection lens 100.

[0051] It is understandable that the present invention does not limit the specific value of the aperture value F of the pixel lens. In the embodiment of the present invention, the aperture value F of the pixel projection lens 100 can be set to any value within the range. The present invention does not impose any restrictions on this. During actual setting, it can be selected according to needs.

[0052] In addition, it should be noted that the pixel projection lens 100 further includes an aperture 5, which is disposed between the first lens 1 and the second lens 2. The aperture 5300 limits the light beam aperture on the optical axis, intercepting some light, thereby reducing light spots and increasing image contrast, thereby improving the imaging quality of the pixel projection lens 100.

[0053] It should be further explained that the pixel projection lens 100 further includes a light emitting body 6, which is spaced apart from the image side of the fourth lens 4. The end surface of the light emitting body 6 facing the object side serves as the image plane. With this arrangement, the light emitting body 6 can emit light along the optical axis.

[0054] Of course, the present invention does not limit the specific size of the light-emitting body 6. In one embodiment of the present invention, the diameter of the image plane of the light-emitting body 6 is IC, and IC≤13.2 mm.

[0055] In a specific embodiment of the present invention, the object-side surface of the first lens 11 is S1, and the image-side surface is S2; the object-side surface of the second lens 22 is S4, and the image-side surface is S5; the object-side surface of the third lens 33 is S6, and the image-side surface is S7; the object-side surface of the fourth lens 44 is S8, and the image-side surface is S9; and the image plane is S10.

[0056] In this embodiment, the focal length of the pixel projection lens 100 is f=27.8 mm, the aperture value is F=0.6, and the image plane diameter IC=13.2 mm.

[0057] It should be noted that, in this embodiment, the basic parameters of the pixel projection lens 100, including lens surface shape, curvature radius, thickness, refractive index, Abbe number, and semi-diameter, are shown in Table 1:

[0058] Table 1

[0059] Surface number Surface shape (mm) Curvature radius (mm) Thickness (mm) Refractive index dispersion coefficient Semi-diameter (mm) OBJ spherical surface Infinity 25000 1 Aspheric 33.806 22.461 1.49 57.4 24.5 2 Aspheric -9.822 0.330 23.1 STO spherical surface Infinity 2.020 19.5 4 Aspheric 299.185 2.916 1.59 29.9 19.4 5 Aspheric 7.376 6.989 16.5 6 spherical surface 55.492 9.931 1.73 54.7 16.6 7 spherical surface -43.782 0.158 16.3 8 spherical surface 17.927 15.733 1.62 63.4 12.9 9 spherical surface 29.196 5.248 8.7 10 spherical surface Infinity 0

[0060] It can be understood that in this embodiment, both the first lens 1 and the second lens 2 are aspherical lenses. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has a better curvature radius characteristic and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens.

[0061] Accordingly, in this embodiment, the third lens 3 and the fourth lens 4 are both glass spherical lenses. This configuration uses spherical lenses to reduce costs while ensuring image quality and reliability, has low assembly sensitivity, and improves the yield rate of finished products.

[0062] It should be noted that, in this embodiment, the object-side surface of the second lens 2 is a concave surface. However, since the second lens 2 is an aspheric lens, according to the definition of an aspheric lens, in this embodiment, the curvature radius of the second lens 2 is a positive value.

[0063] Furthermore, in this embodiment, the aspheric surface shape of the aspheric lens satisfies the following conditions:

[0064]

[0065] Among them, c is the curvature corresponding to the radius, y is the radial coordinate (its unit is the same as the lens length unit), k is the conic quadratic curve coefficient, (when the k coefficient is less than -1, the surface curve is a hyperbola, when the k coefficient is equal to -1, it is a parabola, when the k coefficient is between -1 and 0, it is an ellipse, when the k coefficient is equal to 0, it is a circle, and when the k coefficient is greater than 0, it is an oblate circle), a1, a2, a3, a4, a5, a6 are high-order aspheric coefficients, and the high-order coefficients of each aspheric mirror surface can be seen from the following Table 2:

[0066] Table 2

[0067]

[0068] This setting, through the reasonable distribution of lens optical power, adjustment of glass shape and material matching, effectively eliminates chromatic aberration and secondary spectrum, so that the spherical aberration, coma, astigmatism, etc. on each lens compensate and offset each other to achieve a clear imaging effect, and realize the optimal correction of high-order aberrations and chromatic aberrations.

[0069] Figure 2 FIG. 1 is a schematic diagram of the MTF curve of the pixel projection lens 100 in this embodiment.

[0070] It should be noted that Table 2 shows a design value of the aspheric coefficient of the lens in the pixel projection lens 100 described in this embodiment. The specific numerical value of the aspheric coefficient design value can be adjusted according to product requirements, and the present invention does not impose any limitation on this.

[0071] In another specific embodiment of the present invention, the object-side surface of the first lens 11 is S1, and the image-side surface is S2; the object-side surface of the second lens 22 is S4, and the image-side surface is S5; the object-side surface of the third lens 33 is S6, and the image-side surface is S7; the object-side surface of the fourth lens 44 is S8, and the image-side surface is S9; and the image plane is S10.

[0072] In this embodiment, the focal length of the pixel projection lens 100 is f=27.8 mm, the aperture value is F=0.67, and the image plane diameter IC is 13.2 mm.

[0073] It should be noted that, in this embodiment, the basic parameters of the pixel projection lens 100, including lens surface shape, curvature radius, thickness, refractive index, Abbe number, and semi-diameter, are shown in Table 3:

[0074] Table 3

[0075]

[0076]

[0077] Likewise, in this embodiment, the first lens 1 and the second lens 2 are configured as aspherical lenses, and the third lens 3 and the fourth lens 4 are configured as glass spherical lenses.

[0078] It should be noted that, in this embodiment, the object-side surface of the second lens 2 is a concave surface. However, since the second lens 2 is an aspheric lens, according to the definition of an aspheric lens, in this embodiment, the curvature radius of the second lens 2 is a positive value.

[0079] In this embodiment, the aspheric surface shape of the aspheric lens also satisfies the following conditions:

[0080]

[0081] Among them, c is the curvature corresponding to the radius, y is the radial coordinate (its unit is the same as the lens length unit), k is the conic quadratic curve coefficient, (when the k coefficient is less than -1, the surface curve is a hyperbola, when the k coefficient is equal to -1, it is a parabola, when the k coefficient is between -1 and 0, it is an ellipse, when the k coefficient is equal to 0, it is a circle, and when the k coefficient is greater than 0, it is an oblate circle), a1, a2, a3, a4, a5, a6 are high-order aspheric coefficients, and the high-order coefficients of each aspheric mirror surface can be seen from the following Table 4:

[0082] Table 4

[0083]

[0084] This setting, through the reasonable distribution of lens optical power, adjustment of glass shape and material matching, effectively eliminates chromatic aberration and secondary spectrum, so that the spherical aberration, coma, astigmatism, etc. on each lens compensate and offset each other to achieve a clear imaging effect, and realize the optimal correction of high-order aberrations and chromatic aberrations.

[0085] Figure 3 FIG. 1 is a schematic diagram of the MTF curve of the pixel projection lens 100 in this embodiment.

[0086] It should be noted that Table 4 shows a design value of the aspheric coefficient of the lens in the pixel projection lens 100 described in this embodiment. The specific numerical value of the aspheric coefficient design value can be adjusted according to product requirements, and the present invention does not impose any limitation on this.

[0087] The present invention also provides a car, which includes a pixel projection lens 100. The specific structure of the pixel projection lens 100 refers to the above embodiment. Since the present car adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0088] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pixel projection lens, characterized in that: The pixel projection lens has an object side and an image side correspondingly arranged along the optical axis. The pixel projection lens includes, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and an image plane. The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4. The pixel projection lens meets the following conditions: 10 <f1<20;-6<f2<-14.5;30<f3<40;35<f4<50; The first lens and the second lens are aspherical lenses, and the third lens and the fourth lens are glass spherical lenses.

2. The pixel projection lens according to claim 1, wherein: The first lens is a positive lens, and the object-side surface and the image-side surface of the first lens are convex; The second lens is a negative lens, and the object-side surface and image-side surface of the second lens are concave; The third lens is a positive lens, and the object-side surface and image-side surface of the third lens are convex; The fourth lens is a positive lens, the object-side surface of the fourth lens is convex, and the image-side surface is concave.

3. The pixel projection lens according to claim 1, wherein: The refractive index of the first lens is n1, 1.4≤n1≤1.6; The refractive index of the second lens is n2, 1.5≤n2≤1.7; The refractive index of the third lens is n3, 1.6≤n3≤1.9; The refractive index of the fourth lens is n4, 1.55≤n4≤1.

8.

4. The pixel projection lens according to claim 1, wherein: The dispersion coefficient of the first lens is v1, 50≤v1≤68; The dispersion coefficient of the second lens is v2, 20≤v2≤40; The Abbe coefficient of the third lens is v3, 50≤v3≤68; The Abbe coefficient of the fourth lens is v4, 50≤v4≤68.

5. The pixel projection lens according to claim 1, wherein: The distance between the end of the first lens facing the object side and the image plane is set to TTL, and the effective focal length of the pixel projection lens is EFL, wherein TTL / EFL≤2.

5.

6. The pixel projection lens according to claim 1, wherein: The aperture value of the pixel projection lens is F, 0.5≤F≤1.

0.

7. The pixel projection lens according to claim 1, wherein: The pixel projection lens further includes an aperture, and the aperture is disposed between the first lens and the second lens.

8. The pixel projection lens according to claim 1, wherein: The pixel projection lens further includes a light emitting body, which is spaced apart and arranged on the image side of the fourth lens. An end surface of the light emitting body facing the object side serves as the image plane.

9. The pixel projection lens according to claim 8, wherein: The diameter of the image plane of the luminous body is IC, and IC is ≤ 13.2 mm.

10. An automobile, characterized in that: Comprising the pixel projection lens according to any one of claims 1 to 9.

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