Pixelized vehicle lamp projection lens

Abstract

The invention 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, the five spherical lenses are adopted, and the imaging quality of the lens is improved by reasonably distributing the radius, the thickness and the distance 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 present invention relates to the technical field of automotive lighting, and in particular to a pixelated vehicle headlight projection lens. Background Art

[0002] With the continuous progress of technology, vehicle headlights, as one of the important safety components and exterior components of automobiles, are undergoing important changes and are gradually moving towards intelligence and digitalization, evolving from ordinary lighting headlights to ADB / AFS headlights and then to pixel-level digital projection headlights. Pixel-level digital projection headlights can not only project any required traffic signs and markings according to the traffic driving environment, but also freely control the lighting area and illuminance, thereby enhancing the interaction between the vehicle and the environment, providing safer and more effective lighting for drivers and road participants, minimizing the adverse hazards such as glare to road participants, and providing users with various application scenarios full of a sense of technology and fashion.

[0003] Pixel-level vehicle headlight lighting can generally be divided into three levels: million-level pixels, ten-thousand-level pixels, and one-hundred-level pixels and below. Among them, million-level pixel vehicle headlight lighting has the highest resolution, the highest precision in graphic image control, and the widest and best automotive lighting application scenario experience. Obviously, million-level pixel vehicle headlight lighting needs to meet the requirements of high-resolution projection imaging, high-brightness lighting for vehicle regulations, high reliability requirements, and the low-cost demands of the host factory, etc. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a pixelated vehicle headlight projection lens with high brightness and good imaging quality, which can be applied to vehicle headlights.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a pixelated vehicle headlight projection lens, including an aperture stop, and sequentially arranged along the optical axis from the object side to the image side are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an imaging surface; the first lens, the second lens, the fourth lens, and the fifth lens all have positive optical powers; the third lens has a 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.

[0006] Further: The first lens is a biconvex positive lens; The second lens is a meniscus positive lens, with the object side surface being convex and the image side surface being concave; The third lens is a biconcave positive lens; The fourth lens is a meniscus positive lens, with the object side surface being concave and the image side surface being convex; The fifth lens is a meniscus positive lens, with the object side being convex and the image side being concave.

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

[0008] The refractive index of the material of the first lens is n1, where 1.50 < n1 < 1.90; The Abbe number of the material of the first lens is v1, where 35 < v1 < 65; The refractive index of the material of the second lens is n2, where 1.65 < n2 < 2.05; The Abbe number of the material of the second lens is v2, where 30 < v2 < 55; The refractive index of the material of the third lens is n3, where 1.65 < n3 < 2.00; The Abbe number of the material of the third lens is v3, where 20 < v3 < 50; The refractive index of the material of the fourth lens is n4, where 1.55 < n4 < 1.85; The Abbe number of the material of the fourth lens is v4, where 30 < v4 < 60; The refractive index of the material of the fifth lens is n5, where 1.50 < n5 < 1.85; The Abbe number of the material of the fifth lens is v5, where 40 < v5 < 70.

[0009] 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 respectively denoted as f 1 、f 2 、f 3 、f 4 、f 5 ,where f 1 、f 2 、f 3 、f 4 、f 5 and f satisfy the following ratios: 1.0 < |f 1 / f| < 1.5, 2.0 < |f 2 / f| < 4.5, 0.4 < |f 3 / f| < 1.2, 0.8 < |f 4 / f| < 1.5, 1.5 < |f 5 / f| < 2.5.

[0010] The numerical aperture NA of the projection lens is ≥ 0.35, and the illumination uniformity REI is ≥ 90%, which can meet the requirements of high - brightness illumination for automotive headlamps; the total optical length TTL of the projection lens is < 100 mm, the back focal length BFL is ≥ 35 mm, and the diameter is < φ50 mm, which can meet the requirements of the spatial layout of automotive headlamps.

[0011] The relationship between the total optical length TTL of the projection lens and the focal length f of the optical system satisfies: TTL / f ≤ 2.0.

[0012] The relationship between the imaging height ImgH of the projection lens and the focal length f of the optical system satisfies: ImgH / f ≥ 0.10.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts five spherical glass lenses. From the perspective of the distribution of optical power and structure, the lens has a certain symmetry, which has a great positive effect on correcting aberrations, making the lens have the characteristics of high optical efficiency and good imaging quality, meeting the requirements of high - brightness illumination while taking into account the requirements of high resolution; in addition, the lens structure is simple and compact, and the lenses use all - glass materials, making the system have good environmental reliability. Description of the Drawings

[0014] Figure 1 is the system diagram of Embodiment 1 of the present invention; Figure 2 is the MTF diagram of the projection lens of the present invention; Figure 3 is the 32x16 grid projection simulation diagram of the present invention; In the figure, the reference numerals are: 1, the first lens; 2, the second lens; 3, the third lens; 4, the aperture stop; 5, the fourth lens; 6, the fifth lens; S1, the object surface of the first lens; S2, the image surface of the first lens; S3, the object surface of the second lens; S4, the image surface of the second lens; S5, the object surface of the third lens; S6, the image surface of the third lens; S7, the object surface of the fourth lens; S8, the image surface of the fourth lens; S9, the object surface of the fifth lens; S10, the image surface of the fifth lens; IMG, the imaging surface. Detailed Embodiments

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0016] Refer to Figures 1-3As shown in the figure, a pixelated headlight projection lens includes an aperture stop 4. Along the optical axis from the object side to the image side, 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 sequentially arranged. The first lens, the second lens, the fourth lens, and the fifth lens all have positive optical powers. The third lens has a 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.

[0017] As Figure 1 shown: The first lens is a biconvex positive lens; The second lens is a meniscus positive lens, with the object side surface being convex and the image side surface being concave; The third lens is a biconcave positive lens; The fourth lens is a meniscus positive lens, with the object side surface being concave and the image side surface being convex; The fifth lens is a meniscus positive lens, with the object side surface being convex and the image side surface being concave.

[0018] The first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all glass spherical lenses.

[0019] According to an embodiment of the present invention: If the refractive index of the material of the first lens is n1, then 1.50 < n1 < 1.90; If the Abbe number of the material of the first lens is v1, then 35 < v1 < 65; If the refractive index of the material of the second lens is n2, then 1.65 < n2 < 2.05; If the Abbe number of the material of the second lens is v2, then 30 < v2 < 55; If the refractive index of the material of the third lens is n3, then 1.65 < n3 < 2.00; If the Abbe number of the material of the third lens is v3, then 20 < v3 < 50; If the refractive index of the material of the fourth lens is n4, then 1.55 < n4 < 1.85; If the Abbe number of the material of the fourth lens is v4, then 30 < v4 < 60; If the refractive index of the material of the fifth lens is n5, then 1.50 < n5 < 1.85; If the Abbe number of the material of the fifth lens is v5, then 40 < v5 < 70.

[0020] 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 respectively denoted as f 1 、f 2 、f 3 、f 4 、f 5 ,where f1 , f 2 , f 3 , f 4 , f 5 and f satisfy the following ratios: 1.0 < |f 1 / f| < 1.5, 2.0 < |f 2 / f| < 4.5, 0.4 < |f 3 / f| < 1.2, 0.8 < |f 4 / f| < 1.5, 1.5 < |f 5 / f| < 2.5.

[0021] The numerical aperture NA of the projection lens ≥ 0.35, and the illumination uniformity REI ≥ 90%, which can meet the requirements of high - brightness illumination for automotive headlamps; the total optical length TTL of the projection lens < 100 mm, the back focal length BFL ≥ 35 mm, and the diameter < φ50 mm, which can meet the requirements of the spatial layout of automotive headlamps.

[0022] The total optical length TTL of the projection lens and the focal length f of the optical system satisfy: TTL / f ≤ 2.0.

[0023] The imaging height ImgH of the projection lens and the focal length f of the optical system satisfy: ImgH / f ≥ 0.10.

[0024] According to the embodiments of the present invention: The present invention uses five spherical glass lenses. From the perspective of the power distribution and structure, the lens has a certain symmetry, which has a great positive effect on correcting aberrations, making the lens have the characteristics of high optical efficiency and good imaging quality, meeting the requirements of high - brightness illumination while taking into account the requirements of high resolution; in addition, the lens structure is simple and compact, and the lenses use all - glass materials, making the system have good environmental reliability.

[0025] Table 1 shows the detailed parameters of Example 1: Table 1

[0026] Figure 2 is the MTF curve graph of the embodiment of the present invention, Figure 3 is the 32x16 grid simulation graph of the embodiment of the present invention.

[0027] In summary, the present invention has the characteristics of high optical efficiency and good imaging quality, meets the requirements of high - brightness illumination while taking into account the requirements of high resolution, and has good imaging quality when applied to a projection imaging system.

[0028] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A pixelated vehicle light projection lens, comprising 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 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.

2. The pixelated vehicle light projection lens according to claim 1, characterized in that: The first lens is a biconvex positive lens; The second lens is a positive meniscus lens, the object side surface is convex, and the image side surface is concave; 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.

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

4. The pixelated vehicle light projection lens according to claim 1, characterized in that: The refractive index of the material of the first lens is n1, then l.50 <n1<1.90; The material Abbe number 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 material Abbe number 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 material Abbe number 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 l.50 <n5<1.85; The material Abbe number of the fifth lens is v5, then 40 <v5<70。 5. The pixelated vehicle light projection lens according to claim 1, characterized in that: 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, f5, respectively, wherein f1, f2, f3, f4, f5 and f satisfy the following ratio: 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.

6. The pixelated vehicle light projection lens according to claim 1, characterized in that: The numerical aperture NA of the projection lens is ≥0.35, and the illumination uniformity REI is ≥90%, which can meet the requirements of high-brightness lighting of automobile headlights; the total optical length TTL of the projection lens is <100mm, the optical back focus BFL is ≥35mm, and the diameter is <φ50mm, which can meet the requirements of spatial layout of automobile headlights.

7. The pixelated vehicle light projection lens according to claim 1, characterized in that: 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.

8. The pixelated vehicle light projection lens according to claim 1, characterized in that: 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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