Pixelized vehicle lamp projection lens

Abstract

The utility model relates to the technical field of automobile projection illumination, in particular to a pixelated automobile lamp projection lens. The pixelated car lamp projection lens sequentially comprises a first lens, a second lens, a third lens, an aperture diaphragm, a fourth lens, a fifth lens and an imaging surface from an object side to an image side along an optical axis. The first lens, the second lens, the fourth lens and the fifth lens all have positive focal power, and the third lens has negative focal power. According to the projection lens, five spherical lenses are adopted, and the imaging quality of the lens is improved by reasonably distributing the radius, the thickness and the spacing of each lens; the numerical aperture NA of the lens is greater than or equal to 0.35, so that the projection picture brightness of the lens is high and uniform; in addition, the lens is simple and compact in structure, and the lens is made of a full-glass material, so that the system has good environmental reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile lighting, especially a pixelated vehicle lamp projection lens. BACKGROUND

[0002] With the continuous progress of science and technology, as one of the important safety parts and appearance parts of the automobile, the vehicle lamp is undergoing important changes and gradually moving towards intelligentization and digitization, from ordinary lighting headlamps to ADB / AFS headlamps, and then to pixel-level digital projection headlamps that are constantly evolving. The pixel-level digital projection headlamps not only can project any required traffic signs and markings according to the traffic driving environment, but also can freely control the lighting area and illuminance, thereby enhancing the interaction between the vehicle and the environment, providing safer and more effective lighting for the driver and road participants, and minimizing the adverse effects such as dazzling on road participants, and providing users with a variety of application scenarios that are full of technological and fashionable feelings.

[0003] The pixel-level vehicle lamp lighting can be generally divided into three levels: million-pixel, ten-thousand-pixel, and hundred-pixel and below. Among them, the million-pixel vehicle lamp lighting has the highest resolution, the highest precision of graphic image control precision, and the most extensive and optimal automobile lighting application scenario experience. Obviously, the million-pixel vehicle lamp lighting needs to meet not only high-resolution projection imaging, but also vehicle-grade high-brightness lighting, and high reliability requirements and the demand of low cost of the host factory. SUMMARY

[0004] Therefore, the utility model aims at providing a pixelated vehicle lamp projection lens with high brightness and good imaging quality, which can be applied to automobile headlamps.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a pixelated vehicle lamp projection lens, which comprises an aperture stop, and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an imaging surface are sequentially arranged along the optical axis from the object side to the image side; the first lens, the second lens, the fourth lens, and the fifth lens all have positive focal power; the third lens has negative focal power; the aperture stop is located between the third lens and the fourth lens, or between the second lens and the third lens; the imaging surface is a high-resolution DMD, LCD, or LCoS device;

[0006] The first lens is a double-convex positive lens;

[0007] The second lens is a meniscus positive lens, the object side surface is a convex surface, and the image side surface is a concave surface;

[0008] The third lens is a double-concave positive lens;

[0009] The fourth lens is a meniscus positive lens, the object side surface is a concave surface, and the image side surface is a convex surface;

[0010] The fifth lens is a positive meniscus lens, the object side surface is convex, and the image side surface is concave;

[0011] The projection lens has a numerical aperture NA ≥ 0.35 and an illumination uniformity REI ≥ 90%, which can meet the requirements of high-brightness lighting of automobile headlights. The projection lens has an optical total length TTL < 100 mm, an optical back focus BFL ≥ 35 mm, and a diameter < φ50 mm, which can meet the requirements of the spatial layout of automobile headlights.

[0012] Furthermore, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses.

[0013] The refractive index of the material of the first lens is n1, then 1.50 <n1<1.90;

[0014] The Abbe number of the material of the first lens is v1, then 35 <v1<65;

[0015] The refractive index of the material of the second lens is n2, then 1.65 <n2<2.05;

[0016] The Abbe number of the material of the second lens is v2, then 30 <v2<55;

[0017] The refractive index of the material of the third lens is n3, then 1.65 <n3<2.00;

[0018] The Abbe number of the material of the third lens is v3, then 20 <v3<50;

[0019] The refractive index of the material of the fourth lens is n4, then 1.55 <n4<1.85;

[0020] The material Abbe number of the fourth lens is v4, then 30 <v4<60;

[0021] The refractive index of the material of the fifth lens is n5, then 1.50 <n5<1.85;

[0022] The Abbe number of the material of the fifth lens is v5, then 40 <v5<70。

[0023] The focal length of the projection lens is denoted as f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are denoted as f1, f2, f3, f4, and f5, respectively, where f1, f2, f3, f4, and f5 satisfy the following ratio with f:

[0024] 1.0<|f1 / f|<1.5,

[0025] 2.0<|f2 / f|<4.5,

[0026] 0.4 < |f3 / f| < 1.2,

[0027] 0.8 < |f4 / f| < 1.5,

[0028] 1.5 < |f5 / f| < 2.5.

[0029] The total length of the projection lens TTL and the focal length f of the optical system satisfy: TTL / f≤2.0.

[0030] The imaging height ImgH of the projection lens and the focal length f of the optical system satisfy: ImgH / f≥0.10.

[0031] Compared with the prior art, the utility model has following beneficial effects: the utility model discloses five spherical glass lenses, from the light power distribution and structure, the lens has certain symmetry, has great positive effect to the correction aberration, makes the lens have high optical efficiency and the characteristics of good imaging quality, satisfies high brightness illumination and also gives consideration to the requirement of high resolving power, in addition, the lens structure is simple and compact, and the lens uses full glass material, so that the system has good environmental reliability. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is the system diagram of the utility model embodiment;

[0033] Figure 2 It is the MTF diagram of the projection lens of the utility model;

[0034] Figure 3 It is the 32x16 grid projection simulation diagram of the utility model;

[0035] The figure mark is: 1, first lens;2, second lens;3, third lens;4, aperture diaphragm;5, fourth lens;6, fifth lens;S1, first lens object plane;S2, first lens image plane;S3, second lens object plane;S4, second lens image plane;S5, third lens object plane;S6, third lens image plane;S7, fourth lens object plane;S8, fourth lens image plane;S9, fifth lens object plane;S10, fifth lens image plane;IMG, imaging plane. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be described clearly and completely in conjunction with the drawings in the utility model embodiment, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor are within the protection scope of the utility model. Example

[0037] Reference Figures 1-3 As shown, a pixelated car light projection lens includes an aperture stop 4, and a first lens 1, a second lens 2, a third lens 3, a fourth lens 5, a fifth lens 6 and an imaging surface IMG are arranged in sequence along the optical axis from the object side to the image side; the first lens, the second lens, the fourth lens and the fifth lens all have positive optical power; the third lens has negative optical power; the aperture stop is located between the third lens and the fourth lens, or between the second lens and the third lens; the imaging surface is a high-resolution DMD, LCD or LCoS device.

[0038] like Figure 1 As shown: the first lens is a biconvex positive lens;

[0039] The second lens is a positive meniscus lens with a convex object-side surface and a concave image-side surface.

[0040] The third lens is a biconcave positive lens;

[0041] The fourth lens is a positive meniscus lens with a concave object-side surface and a convex image-side surface.

[0042] The fifth lens is a positive meniscus lens with a convex object-side surface and a concave image-side surface.

[0043] The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses.

[0044] According to the embodiments of the present invention:

[0045] The refractive index of the material of the first lens is n1, then 1.50 <n1<1.90;

[0046] The Abbe number of the material of the first lens is v1, then 35 <v1<65;

[0047] The refractive index of the material of the second lens is n2, then 1.65 <n2<2.05;

[0048] The Abbe number of the material of the second lens is v2, then 30 <v2<55;

[0049] The refractive index of the third lens is n3, then 1.65 <n3<2.00;

[0050] The Abbe number of the material of the third lens is v3, then 20 <v3<50;

[0051] The refractive index of the fourth lens is n4, then 1.55 <n4<1.85;

[0052] The Abbe number of the material of the fourth lens is v4, then 30 <v4<60;

[0053] The refractive index of the material of the fifth lens is n5, then 1.50 <n5<1.85;

[0054] The Abbe number of the material of the fifth lens is v5, then 40 <v5<70。

[0055] The focal length of the projection lens is denoted as f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are denoted as f1, f2, f3, f4, and f5, respectively, where f1, f2, f3, f4, and f5 satisfy the following ratio with f:

[0056] 1.0<|f1 / f|<1.5,

[0057] 2.0<|f2 / f|<4.5,

[0058] 0.4<|f3 / f|<1.2,

[0059] 0.8<|f4 / f|<1.5,

[0060] 1.5<|f5 / f|<2.5.

[0061] The numerical aperture NA of the projection lens is ≥0.35, and the illumination uniformity REI is ≥90%, which can meet the high-brightness lighting requirements of automobile headlights. The total optical length TTL of the projection lens is less than 100mm, the optical back focus BFL is ≥35mm, and the diameter is less than φ50mm, which can meet the spatial layout requirements of automobile headlights.

[0062] The total optical length TTL of the projection lens and the focal length f of the optical system satisfy: TTL / f≤2.0.

[0063] The imaging height ImgH of the projection lens and the focal length f of the optical system satisfy: ImgH / f≥0.10.

[0064] According to the embodiments of the present invention: the present invention adopts five spherical glass lenses. From the perspective of optical power distribution and structure, the lens has a certain symmetry, which has a great positive effect on correcting aberrations, so that the lens has the characteristics of high optical efficiency and good imaging quality, meeting the requirements of high-brightness lighting while taking into account high resolution; in addition, the lens structure is simple and compact, and the lenses are made of all-glass materials, which makes the system have good environmental reliability.

[0065] Table 1 is the detailed parameters of the embodiment:

[0066] Table 1

[0067]

[0068] Figure 2 This is an MTF curve diagram of an embodiment of the utility model.Figure 3 is a 32x16 grid simulation diagram of the embodiment of the utility model.

[0069] In conclusion, the utility model has the characteristics of high optical efficiency and good imaging quality, meets the requirements of high brightness illumination and high resolution, and has good imaging quality when applied to a projection imaging system.

[0070] The above is only the preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A pixelated vehicle light projection lens, including an aperture stop, characterized in that: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an imaging surface are sequentially arranged along the optical axis from the object side to the image side; the first lens, the second lens, the fourth lens, and the fifth lens all have positive focal power; the third lens has negative focal power; the aperture stop is located between the third lens and the fourth lens, or between the second lens and the third lens; the imaging surface is a high-resolution DMD, LCD, or LCoS device; The first lens is a biconvex positive lens; The second lens is a positive meniscus lens, with a convex object-side surface and a concave image-side surface; The third lens is a biconcave positive lens; The fourth lens is a positive meniscus lens, the object side surface is concave, and the image side surface is convex; The fifth lens is a positive meniscus lens, the object side surface is convex, and the image side surface is concave; The projection lens has a numerical aperture NA ≥ 0.35 and an illumination uniformity REI ≥ 90%, which can meet the requirements of high-brightness lighting of automobile headlights. The projection lens has an optical total length TTL < 100 mm, an optical back focus BFL ≥ 35 mm, and a diameter < φ50 mm, which can meet the requirements of the spatial layout of automobile headlights.

2. The pixelated vehicle light projection lens according to claim 1, wherein: The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses.

3. The pixelated vehicle light projection lens according to claim 1, wherein: The refractive index of the material of the first lens is n1, then 1.50 <n1<1.90; The Abbe number of the material of the first lens is v1, then 35 <v1<65; The refractive index of the material of the second lens is n2, then 1.65 <n2<2.05; The Abbe number of the material of the second lens is v2, then 30 <v2<55; The refractive index of the material of the third lens is n3, then 1.65 <n3<2.00; The Abbe number of the material of the third lens is v3, then 20 <v3<50; The refractive index of the material of the fourth lens is n4, then 1.55 <n4<1.85; The material Abbe number of the fourth lens is v4, then 30 <v4<60; The refractive index of the material of the fifth lens is n5, then 1.50 <n5<1.85; The Abbe number of the material of the fifth lens is v5, then 40 <v5<70。 4. The pixelated vehicle light projection lens according to claim 1, wherein: The focal length of the projection lens is denoted as f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are denoted as f1, f2, f3, f4, and f5, respectively, where f1, f2, f3, f4, and f5 satisfy the following ratio with f: 1.0<|f1 / f|<1.5, 2.0<|f2 / f|<4.5, 0.4<|f3 / f|<1.2, 0.8<|f4 / f|<1.5, 1.5<|f5 / f|<2.

5.

5. The pixelated vehicle light projection lens according to claim 1, wherein: The total optical length TTL of the projection lens and the focal length f of the optical system satisfy the following relationship: TTL / f≤2.

0.

6. The pixelated vehicle light projection lens according to claim 1, wherein: The imaging height ImgH of the projection lens and the focal length f of the optical system satisfy the following relationship: ImgH / f≥0.10.

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