Vehicle lamp projection illumination system

Abstract

The utility model discloses a car lamp projection lighting system. A spatial light modulator, a projection lens and a photomask are sequentially arranged from an object side to an image side. The spatial light modulator is a DMD, an LCD or an LCoS, and is an object space in the vehicle lamp projection illumination system. The projection lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a diaphragm, wherein the first lens, the second lens and the third lens form a three-separated lens group or a single-double separated lens group. The diaphragm is located between the first lens and the photomask and specifically comprises an aperture diaphragm and a field diaphragm. The photomask is located between the fifth lens and the image space. The car lamp projection lighting system has the advantages of being high in optical efficiency and good in imaging quality, and meets the requirement for high resolution while meeting high-brightness lighting. In addition, the system 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 projection lighting, in particular to a vehicle lamp projection lighting system. Background Art

[0002] With the continuous advancement of science and technology, headlights, as one of the important safety and appearance parts of automobiles, are undergoing important changes and are gradually moving towards intelligence and digitization, 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 illumination, thereby enhancing the interaction between the car 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 a variety of application scenarios with a sense of technology and fashion.

[0003] Pixel-level car lighting can be roughly divided into three levels: megapixel, ten thousand pixels, and hundred pixels and below. Among them, megapixel car lighting has the highest resolution, the highest precision of graphic image control, and the most extensive and best automotive lighting application scenario experience. Obviously, megapixel car lighting needs to meet the requirements of high-resolution projection imaging, high-brightness lighting at the automotive level, high reliability requirements, and low-cost demands of OEMs. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a vehicle lamp projection lighting system with high optical efficiency and good imaging quality.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a vehicle lamp projection lighting system, comprising a spatial light modulation device, a projection lens and a light cover arranged in sequence from the object side to the image side; the projection lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an aperture; the first lens, the second lens and the third lens form a three-separated lens group or a single-double separated lens group; the aperture comprises an aperture aperture and a field aperture; the light cover is located between the fifth lens and the image side.

[0006] Furthermore, the focal length of the first lens is recorded as f1, the focal length of the second lens is recorded as f2, the focal length of the third lens is recorded as f3, the focal length of the fourth lens is recorded as f4, and the focal length of the fifth lens is recorded as f5; the focal length of the lens group is recorded as f123; the focal length of the projection lens is recorded as f0; and the parameters satisfy the following relationship:

[0007] f123>0 and 0.6<f123 / f0<1.1, 1<f5 / f0<2.

[0008] The spatial light modulation device is located on the focal plane of the projection lens, and is used to load the image control instructions sent by the vehicle computer, and then project a high-definition image through the projection lens.

[0009] The numerical aperture NA of the projection lens is ≥0.35, and the illumination uniformity REI is ≥90%; the total optical length TTL of the projection lens is <100 mm, the optical front focus FFL is ≥35 mm, and the diameter is <φ50 mm.

[0010] The first lens has positive optical power;

[0011] The second lens has negative optical power, and its surface shape is a negative meniscus shape;

[0012] The third lens has positive optical power;

[0013] The fourth lens has negative optical power;

[0014] The fifth lens has positive optical power, and its surface shape is a positive meniscus, plano-convex or biconvex shape.

[0015] The refractive index of the material of the first lens is n1, then l.50 <n1<1.85;

[0016] The material Abbe number of the first lens is v1, then 30 <v1<60;

[0017] The refractive index of the material of the second lens is n2, then 1.65 <n2<2.05;

[0018] The material Abbe number of the second lens is v2, then 15 <v2<40;

[0019] The refractive index of the material of the third lens is n3, then 1.65 <n3<2.00;

[0020] The material Abbe number of the third lens is v3, then 30 <v3<60;

[0021] The refractive index of the material of the fourth lens is n4, then 1.55 <n4<1.85;

[0022] The material Abbe number of the fourth lens is v4, then 20 <v4<40;

[0023] The refractive index of the material of the fifth lens is n5, then l.5 <n5<1.85;

[0024] The material Abbe number of the fifth lens is v5, then 40 <v5<70。

[0025] The aperture diaphragm is located between the first lens and the light cover. The numerical aperture NA of the aperture diaphragm control system is greater than or equal to 0.35. The field diaphragm is used to reduce system stray light and improve image quality in a large field of view. The aperture of the aperture diaphragm is circular, elliptical, rectangular with rounded corners, or irregular.

[0026] Compared with the prior art, the beneficial effect of the utility model is that the first lens, the second lens, and the third lens of the projection lens form a three-separated lens group or a single-double separated lens group, the focal length of the lens group is positive, and the lens group as a whole is combined with the fourth lens and the fifth lens to form a structure similar to the Cooke three-piece structure, so the combination of these five lenses is very conducive to eliminating aberrations and can significantly improve the imaging quality of the projection lens. The diaphragm includes an aperture diaphragm and a field diaphragm, and is located between the first lens and the light shield, wherein the aperture diaphragm is located between the fourth lens and the fifth lens or between the fourth lens and the lens group, and the field diaphragm is generally located inside the lens group or between the fifth lens and the light shield. Through such an arrangement, a pixelated headlight optical system has a high projection resolution, and has the characteristics of high brightness, high reliability and low cost, which can well meet the market demand. The pixelated headlight optical system of the utility model has the characteristics of high optical efficiency and good imaging quality, which meets the requirements of high brightness illumination while taking into account the high resolution; in addition, the system has a simple and compact structure, and the lens therein uses all-glass material, so that the system has good environmental reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a system diagram of Embodiment 1 of the present utility model;

[0028] Figure 2 It is a 32x16 grid projection simulation diagram of the utility model;

[0029] Figure 3 It is a system diagram of the second embodiment of the utility model;

[0030] The numbers in the figure are: 1-first lens; 2-second lens; 3-third lens; 4-fourth lens; 5-fifth lens; 6-light cover; 7-lens group; S1-first lens S1 surface; S2-first lens S2 surface; S3-second lens S3 surface; S4-second lens S4 surface; S5-third lens S5 surface; S6-third lens S6 surface; S7-fourth lens S7 surface; S8-fourth lens S8 surface; S9-fifth lens S9 surface; S10-fifth lens S10 surface; IMG-spatial light modulation device. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Reference Figure 1-3 As shown, the utility model provides a vehicle lamp projection lighting system, which can be applied to vehicle headlights. The system includes a spatial light modulation device IMG, a projection lens and a light cover 6 arranged in sequence from the object side to the image side. The projection lens includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and an aperture. The first lens 1, the second lens 2 and the third lens 3 form a three-separated lens group 7 or a single-double separated lens group. The focal length of the lens group 7 is positive. The lens group as a whole is combined with the fourth lens and the fifth lens to form a structure similar to the Cooke three-piece structure. Therefore, the combination of these five lenses is very conducive to eliminating aberrations and can significantly improve the imaging quality of the projection lens. The aperture includes an aperture aperture and a field aperture, wherein the aperture aperture is located between the fourth lens and the fifth lens or between the fourth lens and the lens group, and the field aperture is generally located inside the lens group or between the fifth lens and the light cover; the light cover is located between the fifth lens and the image side. Example

[0033] The first lens has positive focal power and focal length recorded as f1, the second lens has negative focal power and focal length recorded as f2, the third lens has positive focal power and focal length recorded as f3, the fourth lens has negative focal power and focal length recorded as f4, and the fifth lens has positive focal power and focal length recorded as f5; the first lens, the second lens and the third lens form a three-separated lens group, the focal length of the combined lens group is recorded as f123, and the focal power is positive; the focal length of the projection lens is recorded as f0, and the focal power is positive; the parameters satisfy the following relationship:

[0034] f123>0 and 0.6<f123 / f0<1.1, 1<f5 / f0<2.

[0035] The spatial light modulator is located on the focal plane of the projection lens, and is used to load the image control instructions sent by the vehicle computer, and then project a high-definition image through the projection lens. The numerical aperture NA of the projection lens is ≥0.35, and the illumination uniformity REI is ≥90%; the total optical length TTL of the projection lens is <100mm, the optical front intercept FFL is ≥35mm, and the diameter is <φ50mm. The above-mentioned spatial light modulator is a high-resolution DMD, LCD or LCoS. In the vehicle lamp projection lighting system of the utility model, the spatial light modulator is the object side of the system. Through such a setting, a vehicle lamp projection lighting system has a very high projection resolution, and has the characteristics of high brightness, high reliability and low cost. It can also meet the requirements of the spatial layout of the vehicle headlights.

[0036] In this embodiment, the first lens to the fifth lens are all glass lenses, wherein the first lens has positive optical power; the second lens has negative optical power, and its surface shape is a negative meniscus shape; the third lens has positive optical power; the fourth lens has negative optical power; the fifth lens has positive optical power, and its surface shape is a positive meniscus, plano-convex or biconvex shape.

[0037] The refractive index of the material of the first lens is n1, then l.50 <n1<1.85;

[0038] The material Abbe number of the first lens is v1, then 30 <v1<60;

[0039] The refractive index of the material of the second lens is n2, then l.65 <n2<2.05;

[0040] The material Abbe number of the second lens is v2, then 15 <v2<40;

[0041] The refractive index of the material of the third lens is n3, then 1.65 <n3<2.00;

[0042] The material Abbe number of the third lens is v3, then 30 <v3<60;

[0043] The refractive index of the material of the fourth lens is n4, then 1.55 <n4<1.85;

[0044] The material Abbe number of the fourth lens is v4, then 20 <v4<40;

[0045] The refractive index of the material of the fifth lens is n5, then l.5 <n5<1.85;

[0046] The material Abbe number of the fifth lens is v5, then 40 <v5<70。

[0047] The aperture is located between the first lens and the light shield. The numerical aperture of the aperture aperture control system is ≥0.35. The field aperture is used to reduce system stray light and improve the image quality of a large field of view. The aperture of the aperture is circular, elliptical, rectangular with rounded corners, or special-shaped. The shape of the light shield can be freely designed according to the needs of the shape, and its aperture is generally circular, rectangular with rounded corners or arcs, or other shapes. The light shield is generally injection molded with a high-temperature resistant resin material and then surface treated. It plays a decorative role in the system and can also be used as a system aperture. The following table is the detailed parameters of Example 1

[0048]

[0049] Figure 2 This is a 32x16 grid simulation diagram of the first embodiment. Example

[0050] like Figure 3 As shown, compared with the first embodiment, the difference of the second embodiment is that in the second embodiment, the second lens and the third lens form a doublet lens.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vehicle lamp projection lighting system, characterized in that: The invention comprises a spatial light modulation device, a projection lens and a light shield which are arranged in sequence from the object side to the image side; the projection lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an aperture; the first lens, the second lens and the third lens form a three-separated lens group or a single-double-separated lens group; the aperture includes an aperture aperture and a field aperture; the light shield is located between the fifth lens and the image side.

2. The vehicle lamp projection lighting system according to claim 1, characterized in that: The focal length of the first lens is recorded as f1, the focal length of the second lens is recorded as f2, the focal length of the third lens is recorded as f3, the focal length of the fourth lens is recorded as f4, and the focal length of the fifth lens is recorded as f5; the focal length of the lens group is recorded as f123; the focal length of the projection lens is recorded as f0; the parameters satisfy the following relationship: f123>0 and 0.6<f123 / f0<1.1, 1<f5 / f0<2.

3. The vehicle lamp projection lighting system according to claim 1, characterized in that: The spatial light modulation device is located on the focal plane of the projection lens, and is used to load the image control instructions sent by the vehicle computer, and then project a high-definition image through the projection lens.

4. The vehicle lamp projection lighting system 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%; the total optical length TTL of the projection lens is <100 mm, the optical front focus FFL is ≥35 mm, and the diameter is <φ50 mm.

5. The vehicle lamp projection lighting system according to claim 1, characterized in that: The first lens has positive optical power; The second lens has negative optical power, and its surface shape is a negative meniscus shape; The third lens has positive optical power; The fourth lens has negative optical power; The fifth lens has positive optical power, and its surface shape is a positive meniscus, plano-convex or biconvex shape.

6. The vehicle lamp projection lighting system according to claim 1, characterized in that: The refractive index of the material of the first lens is n1, then l.50 <n1<1.85; The material Abbe number of the first lens is v1, then 30 <v1<60; 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 15 <v2<40; 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 30 <v3<60; 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 20 <v4<40; The refractive index of the material of the fifth lens is n5, then l.5 <n5<1.85; The material Abbe number of the fifth lens is v5, then 40 <v5<70。 7. The vehicle lamp projection lighting system according to claim 1, characterized in that: The aperture diaphragm is located between the first lens and the light cover. The numerical aperture NA of the aperture diaphragm control system is greater than or equal to 0.

35. The field diaphragm is used to reduce system stray light and improve image quality in a large field of view. The aperture of the aperture diaphragm is circular, elliptical, rectangular with rounded corners, or irregular.

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