Optical projection lens, vehicle lamp and vehicle
By using an optical projection lens design with a combination of three lenses, the problems of poor projection effect and insufficient brightness of vehicle headlights have been solved, achieving a high-definition and high-brightness projection effect.
Patent Information
- Application Number
- CN202521925601.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-08
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-08
AI Technical Summary
The vehicle's headlights have problems with poor projection and insufficient brightness.
The optical projection lens employs a three-lens combination, including a first lens with negative optical power, a second lens with positive optical power, and a third lens with negative optical power. Combined with an aperture design, the light path is optimized to improve projection effect and brightness.
It improves the clarity and color accuracy of the projected image, enhances light efficiency, reduces energy waste, strengthens the uniformity and contrast of the projected brightness, and ensures the projection effect and illumination brightness of the vehicle lights.
Smart Images
Figure CN224682467U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of vehicle lighting technology, and particularly relates to an optical projection lens, a vehicle lamp, and a vehicle. Background Technology
[0002] In related technologies, vehicle lights not only provide illumination but also project patterns onto the ground, enabling human-vehicle interaction and thus meeting people's driving and entertainment needs. However, vehicle lights suffer from technical problems such as poor projection effects and insufficient brightness. Summary of the Invention
[0003] Based on the aforementioned technical problems, this application provides an optical projection lens, a vehicle headlight, and a vehicle, aiming to solve, to some extent, the technical problems of poor projection effect and insufficient brightness of vehicle headlights.
[0004] In a first aspect of this application, an optical projection lens is provided, comprising three lenses having optical power, wherein the three lenses are a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the imaging side to the image source side; the first lens has negative optical power, the imaging side surface of the first lens is convex at the optical axis, and the image source side surface of the first lens is concave at the optical axis; the second lens has positive optical power, both the imaging side surface and the image source side surface of the second lens are convex at the optical axis; the third lens has negative optical power, the imaging side surface of the third lens is convex at the optical axis, and the image source side surface of the third lens is concave at the optical axis, and the refractive index of the third lens is n3, where n3 > 1.7.
[0005] The optical projection lens provided in this application receives light emitted from the image source side. After being refracted by the third lens, the second lens, and the first lens, the light is output from the image source side surface of the first lens, forming a projected beam. This not only provides illumination but also projects patterns onto the ground and other surfaces, enabling human-vehicle interaction and meeting people's driving and entertainment needs. Simultaneously, the combination of a first lens with negative optical power, a second lens with positive optical power, and a third lens with negative optical power reduces chromatic aberration in the optical projection lens, improving image clarity and color accuracy when applied to projection lighting. This avoids abnormal color distribution and ensures projection quality. Furthermore, since the refractive index of the third lens is greater than 1.7, it effectively reduces the incident angle of light at the image source side, thereby improving light efficiency and reducing energy waste. This allows more light energy to be focused onto the projected image, improving brightness uniformity and contrast, and ensuring the projection effect and illumination brightness of the vehicle lights.
[0006] In some embodiments, the optical projection lens further includes an aperture stop disposed on the image source side surface of the second lens.
[0007] In some embodiments, the air gap between the image source side surface of the first lens and the imaging side surface of the second lens along the optical axis is D1; the air gap between the image source side surface of the second lens and the imaging side surface of the third lens along the optical axis is D2; and the air gap between the image source side surface of the third lens and the image source side surface along the optical axis is D3; wherein, D1>2D2, D2>4mm, and D3>2.7mm.
[0008] In some implementations, the equivalent focal length of the optical projection lens is f0; the equivalent focal length of the first lens is f1; the equivalent focal length of the second lens is f2; and the equivalent focal length of the third lens is f3; wherein f1>f2>f3>f0.
[0009] In some implementations, f1, f2, and f3 also satisfy the following conditions: |f1-f2|>100mm, |f2-f3|>10mm.
[0010] In some embodiments, the radius of curvature of the imaging-side surface of the first lens at the optical axis is R1, and the radius of curvature of the image-source-side surface of the first lens at the optical axis is R2, wherein |R2|>|R1|, and R1>40mm; the radius of curvature of the imaging-side surface of the second lens at the optical axis is R3, and the radius of curvature of the image-source-side surface of the second lens at the optical axis is R4, wherein |R4|>2|R3|, and R3>20mm; the radius of curvature of the imaging-side surface of the third lens at the optical axis is R5, and the radius of curvature of the image-source-side surface of the third lens at the optical axis is R6, wherein |R6|>2|R5|, and R5>10mm.
[0011] In some embodiments, the refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the third lens is n3, wherein: n3>n1>n2, n1>1.5, and n2>1.5.
[0012] In some embodiments, the Abbe number of the first lens is Vd1, the Abbe number of the second lens is Vd2, and the Abbe number of the third lens is Vd3, wherein: Vd2 - Vd1 > 40, Vd2 - Vd3 > 20. In some embodiments, the first lens is a resin aspherical lens; the second lens is a glass spherical lens; and the third lens is a glass spherical lens.
[0013] In a second aspect of this application, a vehicle lamp is provided, the vehicle lamp including the optical projection lens described in the first aspect and a light source, the light source being located on the image source side of the first optical projection lens.
[0014] The vehicle headlight with the optical projection lens described in the first aspect can improve the clarity and color accuracy of the image during projection illumination, so as to avoid abnormal color distribution, ensure projection quality, improve light efficiency, reduce energy waste, and thus enable more light energy to be focused on the projection image, improve brightness uniformity and contrast, and ensure the projection effect and illumination brightness of the vehicle headlight.
[0015] In a third aspect of this application, a vehicle is also provided, the vehicle including the vehicle lights described in the second aspect.
[0016] Vehicles equipped with the headlights described in the second aspect can improve the clarity and color accuracy of the image when the headlights are projected, so as to avoid abnormal color distribution and ensure projection quality; and can also improve light efficiency and reduce energy waste, thereby enabling more light energy to be focused on the projected image, improving brightness uniformity and contrast, and ensuring the projection effect and illumination brightness of the headlights. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 A schematic diagram of the structure of an optical projection lens 100 in one or more embodiments of this application is shown; Figure 2 It shows Figure 1 A frontal cross-sectional view; Figure 3 It shows Figure 1 A schematic diagram of the optical path principle of the optical projection lens 100 shown; Figure 4 The lens MTF curve of the optical projection lens 100 with the above parameters is shown; Figure 5 A lens dot diagram of an optical projection lens 100 having the above parameters is shown; Figure 6 The lens field curvature and distortion curves of the optical projection lens 100 with the above parameters are shown. Figure 7 A diagram showing the lens vertical aberration of an optical projection lens 100 with the above parameters is presented. Attached image description: 100. Optical projection lens; 10. First lens; 11. First imaging side surface; 12. First image source side surface; 20. Second lens; 21. Second imaging side surface; 22. Second image source side surface; 30. Third lens; 31. Third imaging side surface; 32. Third image source side surface; 40. Light source. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0021] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0022] Traditional vehicle headlights consist of LED chips, a cutoff line structure, a reflector, and a convex lens, resulting in low luminous efficacy and limited illumination functionality. Newly developed pixel headlights, however, utilize digital projection technology, enabling not only illumination but also the projection of patterns onto the ground for human-vehicle interaction, thus meeting driving and entertainment needs. However, traditional vehicle headlights still suffer from poor projection quality and insufficient brightness.
[0023] Based on the above-mentioned technical problems, in a first aspect of the embodiments of this application, an optical projection lens is provided. The optical projection lens includes only three lenses, and it can ensure the projection effect and illumination brightness of the vehicle headlights while realizing the basic function of illumination projection of the vehicle headlights through the combination of only three lenses.
[0024] Figure 1 A schematic diagram of the structure of an optical projection lens 100 according to one or more embodiments of this application is shown. Figure 2 It shows Figure 1 A frontal cross-sectional schematic diagram. Figure 3 It shows Figure 1 The diagram shows the optical path principle of the optical projection lens 100. (Combined with...) Figures 1-3 The optical projection lens 100 provided in this application embodiment includes three lenses with optical power. The three lenses are a first lens 10, a second lens 20, and a third lens 30. The first lens 10, the second lens 20, and the third lens 30 are arranged sequentially from the imaging side to the image source side along the optical axis. The first lens 10 has a negative optical power, the second lens 20 has a positive optical power, and the third lens 30 has a negative optical power. The refractive index of the third lens 30 is n3, where n3 > 1.7.
[0025] The optical projection lens 100 provided in this embodiment of the application, when in use, the light beam generally follows... Figure 3 The light emitted in the direction of the arrow, i.e., from the image source side, is refracted by the third lens 30, the second lens 20, and the first lens 10, and then output from the imaging side surface of the first lens 10 to form a projected beam. This allows for illumination while simultaneously projecting patterns onto the ground or other surfaces, enabling human-vehicle interaction and meeting people's driving and entertainment needs. Furthermore, the combination of the first lens 10 (with negative optical power), the second lens 20 (with positive optical power), and the third lens 30 (with negative optical power) improves aberrations and reduces chromatic aberration in the optical projection lens 100. This enhances the image clarity and color accuracy when the optical projection lens 100 is used for projection lighting, preventing abnormal color distribution and ensuring projection quality. Additionally, since the refractive index of the third lens 30 is greater than 1.7, it effectively reduces the angle of incidence of light at the image source side, thereby improving light efficiency and reducing energy waste. This allows more light energy to be focused onto the projected image, improving brightness uniformity and contrast, ensuring the projection effect and illumination brightness of the vehicle lights, demonstrating excellent practicality.
[0026] For ease of description, the imaging side surface of the first lens 10 is defined as the first imaging side surface 11, and the image source side surface of the first lens 10 is defined as the first image source side surface 12; the imaging side surface of the second lens 20 is defined as the second imaging side surface 21, and the image source side surface of the second lens 20 is defined as the second image source side surface 22; the imaging side surface of the third lens 30 is defined as the third imaging side surface 31, and the image source side surface of the third lens 30 is defined as the third image source side surface 32. The first lens 10, the second lens 20, and the third lens 30 are coaxially arranged, and the common axis of the first lens 10, the second lens 20, and the third lens 30 is the optical axis of the optical projection lens 100. The light source 40 is disposed on one side of the image source side surface of the third lens 30. The light source 40 may include a circuit board and multiple LEDs. The multiple LEDs are integrated on the side of the circuit board facing the image source side surface of the third lens 30 to emit light along the... Figure 3 The beam of light in the direction indicated by the arrow, light source 40 is the image source side of the optical projection lens 100.
[0027] Combination Figure 1 as well as Figure 3 In some embodiments, the imaging-side surface (i.e., the first imaging-side surface 11) of the first lens 10 is convex at the optical axis, and the image-source-side surface (i.e., the first image-source-side surface 12) of the first lens 10 is concave at the optical axis. This can further reduce the aberrations of the optical projection lens 100 and improve the image sharpness. At the same time, by designing the shape of the imaging-side surface of the first lens 10 as convex at the optical axis and the shape of the image-source-side surface of the first lens 10 as concave at the optical axis, peripheral field distortion can be suppressed, and excessive increase in peripheral field distortion can be prevented.
[0028] Combination Figure 1 as well as Figure 3 In some embodiments, both the imaging-side surface (i.e., the second imaging-side surface 21) and the image-source-side surface (i.e., the second image-source-side surface 22) of the second lens 20 are convex at the optical axis. By designing both the imaging-side surface and the image-source-side surface of the second lens 20 to be convex at the optical axis, it is beneficial for the light collected by the optical projection lens 100 to converge.
[0029] Combination Figure 1 as well as Figure 3 In some embodiments, the imaging-side surface (i.e., the third imaging-side surface 31) of the third lens 30 is convex at the optical axis, and the image-source-side surface (i.e., the third image-source-side surface 32) of the third lens 30 is concave at the optical axis. This configuration can further reduce the aberrations of various orders in the optical projection lens 100 and improve the image sharpness. At the same time, by designing the shape of the imaging-side surface of the third lens 30 as convex at the optical axis and the shape of the image-source-side surface of the third lens 30 as concave at the optical axis, peripheral field distortion can be suppressed, and excessive increase in peripheral field distortion can be prevented.
[0030] In some embodiments, to reduce stray light and improve imaging performance, the optical projection lens 100 may further include an aperture stop. The aperture stop is located on the image source-side surface (i.e., the second image source-side surface 22) of the second lens 20, and can be used as both an aperture stop and a field stop. Typically, the aperture stop affects the output aperture and aberrations of the optical projection lens 100. To balance the output aperture and aberrations, this embodiment places the aperture stop on the image source-side surface of the second lens 20 to reduce aberrations while ensuring the output aperture and thus guaranteeing projection quality. In other embodiments, the aperture stop can also be located at other positions, such as on the surface of the first image source-side surface 12 or the third image source-side surface 32. Alternatively, aperture stops can be provided on the surfaces of the first image source-side surface 12, the second image source-side surface 22, and the third image source-side surface 32, depending on the specific requirements. Furthermore, by placing the aperture stop on the image source-side surface of the second lens 20, the observation of the light source 40 from the imaging side surface of the optical projection lens 100 can be avoided to some extent, improving the overall aesthetics of the optical projection lens 100.
[0031] In some embodiments, the air gap along the optical axis between the image source side surface (i.e., the first image source side surface 12) of the first lens 10 and the imaging side surface (i.e., the second imaging side surface 21) of the second lens 20 is D1; the air gap along the optical axis between the image source side surface (i.e., the second image source side surface 22) of the second lens 20 and the imaging side surface (i.e., the third imaging side surface 31) of the third lens 30 is D2; and the air gap along the optical axis between the image source side surface (i.e., the third image source side surface 32) of the third lens 30 and the light source 40 is D3; wherein, D1>2D2, D2>4mm, and D3>2.7mm. Exemplarily, D2 can be 5mm, 6mm, or 7mm, and D3 can be 2.8mm, 2.9mm, or 3mm. The air gap affects the propagation path of light. By setting the air gap along the optical axis between the lenses in this way, a suitable optical power is determined, and specific aberrations are reduced to ensure image quality. Here, D3 is the back focal length of the optical projection lens 100.
[0032] In some embodiments, the equivalent focal length of the optical projection lens 100 is f0; the equivalent focal length of the first lens 10 is f1; the equivalent focal length of the second lens 20 is f2; and the equivalent focal length of the third lens 30 is f3; wherein f1>f2>f3>f0, |f1-f2|>100mm, and |f2-f3|>10mm. For example, |f1-f2| can be 105mm, 110mm, or 115mm; and |f2-f3| can be 10.5mm, 11mm, or 11.5mm. That is, the equivalent focal length of each lens in this embodiment increases sequentially along the optical axis from the imaging side to the image source side, and the equivalent focal length of each lens is greater than the equivalent focal length of the optical projection lens 100, in order to reduce specific aberrations and ensure image quality.
[0033] In some embodiments, the radius of curvature of the imaging side surface (i.e., the first imaging side surface 11) of the first lens 10 at the optical axis is R1, and the radius of curvature of the image source side surface (i.e., the first image source side surface 12) of the first lens 10 at the optical axis is R2, wherein |R2|>|R1|, and R1>40mm. For example, R1 can be 42mm, 44mm, or 45mm; the radius of curvature of the imaging side surface (i.e., the second imaging side surface 21) of the second lens 20 at the optical axis is R3, and the radius of curvature of the image source side surface (i.e., the second image source side surface 22) of the second lens 20 at the optical axis is R3. 2) The radius of curvature at the optical axis is R4, where |R4|>2|R3| and R3>20mm. For example, R3 can be 21mm, 22mm or 23mm. The radius of curvature at the optical axis of the imaging side surface (i.e. the third imaging side surface 31) of the third lens 30 is R5, and the radius of curvature at the optical axis of the image source side surface (i.e. the third image source side surface 32) of the third lens 30 is R6, where |R6|>2|R5| and R5>10mm. For example, R5 can be 10.5mm, 11mm, 11.5mm or 12mm. That is, the radius of curvature of each lens in this embodiment increases sequentially along the optical axis from the imaging side to the image source side. With this configuration, the light beam emitted by the light source 40 can first be diffused by the third lens 30 with the largest radius of curvature to ensure the output range, achieve large aperture output, and meet the field of view requirements. Then, it is constrained by the second lens 20 with a smaller radius of curvature and the first lens 10 to focus the light and ensure the imaging quality.
[0034] In some embodiments, the refractive index of the first lens 10 is n1 and the Abbe number is Vd1, the refractive index of the second lens 20 is n2 and the Abbe number is Vd2, and the refractive index of the third lens 30 is n3 and the Abbe number is Vd3, wherein: n3>n1>n2, n1>1.5, n2>1.5, n3>1.7, Vd2-Vd1>40, and Vd2-Vd3>20, in order to reduce chromatic aberration, ensure uniform imaging color, and thus ensure imaging quality.
[0035] In some embodiments, the first lens 10 is a negative optical power aspherical lens, the second lens 20 is a positive optical power spherical lens, and the third lens 30 is a negative optical power spherical lens. That is, the optical projection lens 100 uses fewer lenses and fewer aspherical high-order terms, which can effectively reduce the difficulty of manufacturing and assembly.
[0036] Because plastic is inexpensive, easy to process, and readily available for spherical fabrication, the first lens 10, the second lens 20, and the third lens 30 can all be made of plastic. Of course, to improve image quality, the first lens 10, the second lens 20, and the third lens 30 can also be made partially or entirely of glass. Glass is highly adaptable to the environment and has a wide temperature range, ensuring image quality. In the embodiments of this application, the first lens 10 is a resin aspherical lens; the second lens 20 is a glass spherical lens; and the third lens 30 is a glass spherical lens.
[0037] In this embodiment, the relevant parameters of the optical projection lens 100 are shown in Table 1, and the parameters of each lens of the optical projection lens 100 are shown in Table 2.
[0038]
[0039] Table 1
[0040] Table 2 In some embodiments, the surface of the lens of the optical projection lens 100 may be aspherical. For these aspherical surfaces, the aspherical equation is: .
[0041] Where: z is the sag at position r on the aspherical surface, c is the paraxial curvature of the aspherical surface, c=1 / R, R is the radius of curvature, K is the conic coefficient, and A~J are coefficients of higher-order terms.
[0042] Table 3 shows the aspherical parameters of the optical projection lens 100, and Table 4 shows the RMS radius and GEO radius of the optical projection lens 100 with the above parameters.
[0043]
[0044] Table 3
[0045] Table 4 As can be seen from Tables 3 and 4, the optical projection lens 100 provided in this application embodiment has fewer lenses and fewer aspherical high-order terms, which can effectively reduce the difficulty of manufacturing and assembly, and facilitate the processing, manufacturing and assembly of the optical projection lens 100, thus having good practicality.
[0046] Figure 4 The lens MTF curve of the optical projection lens 100 with the above parameters is shown. Figure 5 A lens dot diagram of an optical projection lens 100 having the above parameters is shown. Figure 6The image shows the lens field curvature and distortion curves of the optical projection lens 100 with the above parameters. Figure 7 A diagram showing the transverse aberration of an optical projection lens 100 with the aforementioned parameters is presented. From Figure 4 The MTF curve shown and Figure 5 As shown in the dot plot, although the edge field of view is poor, the imaging quality within the central field of view is very good and meets the imaging quality requirements; from Figure 6 The lens field curvature and distortion parameters shown are as follows: Figure 7 As can be seen from the lens transverse aberration shown, the optical projection lens 100 of this application embodiment can meet the requirements of vehicle headlight projection. That is, when the optical projection lens 100 provided in this application embodiment is applied to a projection imaging system, it can not only meet the imaging quality requirements, but also meet the requirements of applications with high energy requirements (i.e., the requirements of lighting brightness), and has good practicality.
[0047] In a second aspect of this application, an embodiment provides a vehicle lamp, which includes an optical projection lens 100 (as described in the first aspect) and a light source 40. The light source 40 is disposed on the image source side of a third lens 20. Light emitted from the light source 40 is refracted by the third lens 30, the second lens 20, and the first lens 10, and then output from the imaging side surface of the first lens 10 to form a projected beam. This beam not only provides illumination but also projects patterns onto the ground or other surfaces, enabling human-vehicle interaction and thus meeting people's driving and entertainment needs. The aforementioned optical projection lens can be applied to headlights, and of course, to other types of vehicle lamps; this application does not impose any limitations on this application.
[0048] Headlights equipped with optical projection lenses can improve the clarity and color accuracy of projected images to avoid abnormal color distribution; they can also improve light efficiency and reduce energy waste, thereby enabling more light energy to be focused on the projected image, improving brightness uniformity and contrast, and ensuring the projection effect and illumination brightness of the headlights.
[0049] In a third aspect of this application, an embodiment of this application also provides a vehicle that includes the vehicle lights described in the second aspect.
[0050] Vehicles equipped with headlights in the second aspect can improve the clarity and color accuracy of images projected by the headlights, thereby avoiding abnormal color distribution and ensuring projection quality. Furthermore, they can improve light efficiency, reduce energy waste, and thus allow more light energy to be focused onto the projected image, improving brightness uniformity and contrast, and ensuring the projection effect and illumination brightness of the headlights. For example, the vehicle is an automobile, and the headlights provided in the second aspect are mounted on the automobile body.
[0051] The optical projection lens provided in this application embodiment utilizes a combination of "negative-positive-negative" optical power to complete a three-element lens design. This reduces the number of lenses while ensuring the projection effect and illumination brightness of the optical projection lens, thereby reducing the size of the optical projection lens and the size of the vehicle headlight with the optical projection lens, reducing the space occupied by the headlight on the vehicle body, and facilitating its installation on the vehicle body. In addition, the "negative-positive-negative" optical power structure can effectively control the aperture of the outermost lens, making it suitable for lighting needs with narrow apertures (≤20mm). In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0052] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0053] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.
[0054] In the description of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.
[0056] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.
[0057] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.
Claims
1. An optical projection lens, characterized in that, It includes three lenses with optical power, namely a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the imaging side to the image source side; The first lens has negative optical power, the imaging side surface of the first lens is convex at the optical axis, and the image source side surface of the first lens is concave at the optical axis; The second lens has positive optical power, and both the imaging side surface and the image source side surface of the second lens are convex at the optical axis; The third lens has negative optical power, the imaging side surface of the third lens is convex at the optical axis, the image source side surface of the third lens is concave at the optical axis, and the refractive index of the third lens is n3, where n3 > 1.
7.
2. The optical projection lens according to claim 1, characterized in that, The optical projection lens also includes an aperture stop, which is disposed on the image source side surface of the second lens.
3. The optical projection lens according to claim 1, characterized in that, The air gap between the image source side surface of the first lens and the imaging side surface of the second lens along the optical axis is D1; The air gap between the image source side surface of the second lens and the imaging side surface of the third lens along the optical axis is D2; The air gap between the image source side surface of the third lens and the image source side along the optical axis is D3; Among them, D1>2D2, D2>4mm, and D3>2.7mm.
4. The optical projection lens according to claim 1, characterized in that, The equivalent focal length of the optical projection lens is f0; The equivalent focal length of the first lens is f1; The equivalent focal length of the second lens is f2; The equivalent focal length of the third lens is f3; Among them, f1> f2> f3> f0.
5. The optical projection lens according to claim 4, characterized in that, The f1, f2, and f3 also satisfy the following condition: |f1- f2|>100mm, |f2- f3|>10mm.
6. The optical projection lens according to claim 1, characterized in that, The radius of curvature of the imaging side surface of the first lens at the optical axis is R1, and the radius of curvature of the image source side surface of the first lens at the optical axis is R2, wherein |R2|>|R1|, and R1>40mm; The radius of curvature of the imaging side surface of the second lens at the optical axis is R3, and the radius of curvature of the image source side surface of the second lens at the optical axis is R4, wherein |R4|>2|R3|, and R3>20mm; The radius of curvature of the imaging side surface of the third lens at the optical axis is R5, and the radius of curvature of the image source side surface of the third lens at the optical axis is R6, |R6|>2|R5|, and R5>10mm.
7. The optical projection lens according to claim 1, characterized in that, The first lens has a refractive index of n1, the second lens has a refractive index of n2, and the third lens has a refractive index of n3, wherein: n3 > n1 > n2, n1 > 1.5, and n2 > 1.
5.
8. The optical projection lens according to claim 7, characterized in that, The Abbe number of the first lens is Vd1, the Abbe number of the second lens is Vd2, and the Abbe number of the third lens is Vd3, wherein: Vd2 - Vd1 > 40, and Vd2 - Vd3 > 20.
9. A vehicle light, characterized in that, The vehicle lights include: The optical projection lens according to any one of claims 1-8; A light source, located on the image source side of the optical projection lens.
10. A vehicle, characterized in that, The vehicle includes the headlights as described in claim 9.