Vehicle-mounted headlamp lens and automobile

Abstract

The application discloses a vehicle-mounted headlamp lens and a vehicle, relates to the technical field of vehicle-mounted headlamps, and comprises an optical module, wherein the optical module comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along an optical axis; the first lens and the fifth lens are both meniscus lenses, the convex surfaces of the first lens and the fifth lens are both convex in a first direction, the second lens is a double-concave lens, the third lens and the fourth lens are both double-convex lenses, and the first direction is a direction pointing to a projection magnification side along the optical axis. The vehicle-mounted headlamp lens is beneficial to improving the light energy utilization rate.

Description

Technical Field

[0001] This application relates to the field of automotive headlight technology, and in particular to an automotive headlight lens and automobile. Background Technology

[0002] Among related technologies, DLP headlight projection lenses are widely used in various vehicle models. In the future, DLP technology may be combined with technologies such as autonomous driving and vehicle networking to further improve vehicle safety and intelligence. Projection lenses generally consist of multiple lenses, and with continuous technological advancements and increasing customer demands, higher requirements are being placed on the energy efficiency of headlight lenses. Utility Model Content

[0003] The main purpose of this application is to propose a vehicle headlight lens and a car, which aims to at least improve the technical problem of low light energy utilization of current vehicle headlight lenses.

[0004] To achieve the above objectives, according to some embodiments of this application, this application provides a vehicle headlight lens, including: An optical module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture, and an optical modulation chip arranged sequentially along an optical axis. The first lens and the fifth lens are both concave and convex lenses, and the convex surfaces of the first lens and the fifth lens are both convex along a first direction. The second lens is a double-sided concave lens, and the third lens and the fourth lens are both double-sided convex lenses. The first direction is the direction along the optical axis pointing towards the projection magnification side.

[0005] In some embodiments, the second lens includes a first concave surface facing the third lens, the third lens includes a first convex surface facing the second lens, the shape of the first concave surface is adapted to the shape of the first convex surface, and the first concave surface is in contact with the first convex surface.

[0006] In some embodiments, the optical module further includes an optical modulation chip and an aperture, wherein the fourth lens, the fifth lens, the optical modulation chip and the aperture are arranged sequentially along the optical axis.

[0007] In some embodiments, the aperture of the aperture stop is 30mm to 40mm.

[0008] In some embodiments, the aperture stop is disposed at the outer edge of the fifth lens.

[0009] In some embodiments, the F-number of the optical module is 0.95 to 1.05; wherein, the F-number refers to the ratio of the lens focal length to the entrance pupil diameter.

[0010] In some embodiments, the absolute value of the focal length of the first lens is greater than 300mm, the absolute value of the focal length of the combined lens consisting of the second lens and the third lens is 30mm~90mm, the focal length of the fourth lens is 30mm~80mm, and the focal length of the fifth lens is 50mm~100mm; wherein, the focal length of the second lens is -30mm~-15mm, and the focal length of the third lens is 20mm~60mm.

[0011] In some embodiments, the center thickness of the first lens is 5mm to 15mm and the outer diameter is 37mm to 50mm; the center thickness of the second lens is 4.5mm to 8mm and the outer diameter is 37mm to 50mm; the center thickness of the third lens is 9mm to 16mm and the outer diameter is 37mm to 50mm; the center thickness of the fourth lens is 7mm to 12mm and the outer diameter is 37mm to 50mm; and the center thickness of the fifth lens is 5mm to 9mm and the outer diameter is 37mm to 50mm.

[0012] In some embodiments, the third lens, the fourth lens, and the fifth lens are all lanthanide rare earth glass lenses, and the refractive index of the third lens, the fourth lens, and the fifth lens is greater than 1.7.

[0013] In some embodiments, the optical modulation chip is a DMD chip.

[0014] According to some embodiments of this application, this application provides an automobile that includes the aforementioned vehicle headlight lens.

[0015] In the above solution, the vehicle headlight lens includes a housing and an optical module disposed within the housing. The optical module includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis. The first and fifth lenses are both concave and convex lenses, with their convex surfaces protruding along a first direction. The second lens is a double-sided concave lens, and the third and fourth lenses are both double-sided convex lenses. The first direction is the direction along the optical axis pointing towards the projection magnification side. This utility model is beneficial for improving light energy utilization.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. 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 the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an optical module according to some embodiments of this application; Figure 2 This is a schematic diagram of the optical path of an optical module in some embodiments of this application; Figure 3 The following are distortion curves of optical modules in some embodiments of this application; Figure 4 MTF curves of optical modules in some embodiments of this application; Figure 5 This is a relative illumination curve diagram of the optical module of some embodiments of this application; Figure 6 This is a color difference curve diagram of an optical module in some embodiments of this application.

[0019] Explanation of icon numbers: 100. Optical module; 1. First lens; 2. Second lens; 21. First concave surface; 3. Third lens; 31. First convex surface; 4. Fourth lens; 5. Fifth lens; 6. Aperture; 7. DMD chip; A. Optical axis.

[0020] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, the use of terms such as "first," "second," etc., 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 that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] 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.

[0025] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are feasible to those skilled in the art. If a combination of technical solutions contradicts each other or cannot be implemented, it should be considered that such a combination does not exist and is not within the scope of protection claimed in this application. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0026] The descriptions of directions such as "up", "down", "front", "back", "left", and "right" in this application are based on the directions shown in the figure and are only used to explain the relative positional relationship between the components in the posture shown in the figure. If the specific posture changes, the directional indication will also change accordingly.

[0027] DLP (Digital Light Processing) projection headlights are products that apply DLP technology to vehicle headlights. They boast high brightness, high resolution, and the ability to project complex patterns such as adaptive lighting, lane projection, and pedestrian warnings. Furthermore, DLP technology supports dynamic adjustment, adapting to road conditions and the driving environment in real time. Currently, DLP headlight projection lenses are primarily used by high-end car brands such as Audi and Mercedes-Benz. These brands have used DLP technology to improve vehicle lighting and safety, while also enhancing the vehicle's technological sophistication and personalization. With continuous technological advancements and cost reductions, DLP headlight projection lenses are expected to be used in more vehicle models. In the future, DLP technology may be combined with technologies such as autonomous driving and vehicle-to-everything (V2X) connectivity to further improve vehicle safety and intelligence.

[0028] However, among related technologies, the low light energy utilization rate of DLP headlight projection lenses limits their use in automobiles.

[0029] Therefore, this application provides a vehicle headlight lens.

[0030] Reference Figure 1 and Figure 2 According to some embodiments of this application, this application provides a vehicle headlight lens, including a housing and an optical module 100 disposed within the housing. The optical module 100 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5 arranged sequentially along the optical axis A. The first lens 1 and the fifth lens 5 are both concave and convex lenses, and the convex surfaces of the first lens 1 and the fifth lens 5 are both convex along a first direction. The second lens 2 is a double-sided concave lens, and the third lens 3 and the fourth lens 4 are both double-sided convex lenses. The first direction is the direction along the optical axis A pointing towards the projection magnification side.

[0031] Arranged sequentially along the optical axis A, such as Figure 1 As shown, optical axis A is horizontal, so the components of optical module 100 can be as follows: Figure 1 The arrangement shown is from left to right. Of course, it could also be arranged from right to left. In this application, the first direction refers to the direction along the optical axis A towards the projection magnification side, that is... Figure 1 The direction indicated by the middle arrow, from right to left, can also be described as the direction from the fifth lens 5 (first lens) to the first lens 1. A concave-convex lens refers to a lens where one of its two surfaces is concave and the other convex. A double-concave lens refers to a second lens 2 where both surfaces are concave, also commonly referred to as a concave lens; a double-convex lens refers to a lens where both surfaces are convex, also commonly referred to as a convex lens. The automotive headlight lens is a key component of DLP (Digital Light Processing) headlights. DLP headlights have much higher light efficiency requirements than projectors with consumer lenses, corresponding to a much lower F-number. The F-number refers to the ratio of the lens's focal length to its entrance pupil diameter. A smaller F-number indicates a larger aperture, greater light intake, and higher luminous efficiency. The automotive headlight lens used in this embodiment can achieve an F-number of around 1.0; for example, the F-number of optical module 100 can be 0.95~1.05, which is beneficial for improving light energy utilization.

[0032] Reference Figure 1In some embodiments, the optical module 100 further includes a light modulation chip and an aperture 6, with the fourth lens 4, the fifth lens 5, the light modulation chip, and the aperture 6 arranged sequentially along the optical axis. The light modulation chip can be a DMD (Digital Micromirror Device) chip 7. In a specific embodiment, the aperture of the aperture 6 can be set to 30mm~40mm. By selecting appropriate focal lengths, center thicknesses, and aperture sizes for each lens, and matching them with an appropriate aperture size for the aperture 6, the light transmission can be improved.

[0033] Reference Figure 1 In some embodiments, the second lens 2 includes a first concave surface 21 facing the third lens 3, and the third lens 3 includes a first convex surface 31 facing the second lens 2. The shape of the first concave surface 21 is adapted to the shape of the first convex surface 31, and the first concave surface 21 and the first convex surface 31 are fitted together. The second lens 2 and the third lens 3 are cemented together. Specifically, the second lens 2 is a biconcave lens, and the side of the second lens 2 facing the third lens 3 is defined as the first concave surface 21. The third lens 3 is a biconvex lens, and the side of the third lens 3 facing the second lens 2 is defined as the first convex surface 31. The adaptation of the shape of the first concave surface 21 to the shape of the first convex surface 31 means that the two can fit together tightly, and there is almost no gap between the second lens 2 and the third lens 3 after they are fitted together. In terms of lens material selection, the second lens 2 can be made of a high-refractive-index, high-dispersion glass lens, and the third lens 3 can be made of a high-refractive-index, low-dispersion glass.

[0034] Reference Figure 1 and Figure 2 In some embodiments, the aperture stop 6 is disposed on the end face of the fifth lens 5 on the side opposite to the fourth lens 4, where the end face refers to the outer edge of the concave surface of the fifth lens 5. This arrangement has at least two advantages: First, it increases the back working distance. Because the larger the field of view of the same DMD chip 7, the smaller the lens focal length, and consequently the smaller the back working distance. However, illumination design requires sufficient back working distance for the lens, and placing the aperture stop 6 on the right end face of the fifth lens 5 maximizes this back working distance. Second, it helps reduce the lens aperture. In illumination design, as the field of view increases, the corresponding beam aperture angle of the beam from the DMD chip 7 towards the lens gradually decreases. Therefore, vignetting design is also considered in lens design, thereby reducing the apertures of the first lens 1, second lens 2, third lens 3, and fourth lens 4.

[0035] In some embodiments, the absolute value of the focal length of the first lens 1 is greater than 300mm, the absolute value of the focal length of the combined lens formed by the second lens 2 and the third lens 3 is 30mm~90mm, the focal length of the fourth lens 4 is 30mm~80mm, and the focal length of the fifth lens 5 is 50mm~100mm; wherein, the focal length of the second lens 2 is -30mm~-15mm, and the focal length of the third lens 3 is 20mm~60mm. The absolute value of the focal length of the first lens 1 being greater than 300mm means that the focal length of the first lens 1 can be either a positive or negative focal length, and the absolute value of either is greater than 300mm. The absolute value of the focal length of the combined lens formed by the second lens 2 and the third lens 3 being 30mm~90mm means that the second lens 2 and the third lens 3 are cemented together to form a new combined lens, and the focal length of this combined lens can be either a positive or negative focal length. The third lens 3, the fourth lens 4, and the fifth lens 5 are all positive focal lengths. Choosing an appropriate focal length value helps to obtain a suitable range of F-numbers and improve light energy utilization.

[0036] In some embodiments, the center thickness of the first lens 1 is 5mm~15mm, and the outer diameter is 37mm~50mm; the center thickness of the second lens 2 is 4.5mm~8mm, and the outer diameter is 37mm~50mm; the center thickness of the third lens 3 is 9mm~16mm, and the outer diameter is 37mm~50mm; the center thickness of the fourth lens 4 is 7mm~12mm, and the outer diameter is 37mm~50mm; and the center thickness of the fifth lens 5 is 5mm~9mm, and the outer diameter is 37mm~50mm. Here, the center thickness refers to the thickness at the center of the lens, which is generally the thickness at the point where the optical axis A passes through; and the outer diameter refers to the diameter corresponding to the circle at the outermost edge of each lens.

[0037] In some embodiments, the third lens 3, the fourth lens 4, and the fifth lens 5 are all lanthanide rare earth glass lenses, and the refractive indices of the third lens 3, the fourth lens 4, and the fifth lens 5 are all greater than 1.7. Regarding the selection of materials for each lens, the first lens 1 can be made of glass or plastic with high refractive index and high dispersion characteristics, the second lens 2 is made of glass with high refractive index and high dispersion, and the third lens 3, the fourth lens 4, and the fifth lens 5 are all made of glass with high refractive index and low dispersion.

[0038] To clearly illustrate the utility of this application, a specific embodiment is described below. The optical module 100 has a focal length of 33.65 mm, a field of view of 18° × 9°, and an F-number of 1.0. It is illuminated with light of wavelengths of 0.4 μm, 0.55 μm, and 0.6 μm, respectively.

[0039] Figure 3The horizontal axis represents distortion, and the vertical axis represents the field of view. The curves for each wavelength almost overlap, and the distortion is less than 2%, proving that the imaging distortion is small. Figure 4 The MTF curve, short for Modulation Transfer Function, is a scientific tool used to measure the sharpness and contrast of an image formed by a lens or optical system. It objectively reflects the lens's ability to reproduce details of the real world. In the graph, the dashed and solid lines represent the curves obtained from light waves in the tangential and sagittal directions, respectively. It can be seen that for different field of view angles, even when the horizontal axis is aligned to 16, the sharpness on the vertical axis can still reach above 0.5. Figure 5 The values ​​represent light with a wavelength of 0.55 μm. The horizontal axis represents the lateral field of view, and the vertical axis represents the relative illuminance. It can be seen that when the field of view is 0° to 9.0°, the relative illuminance is above 85%. Figure 6 This diagram shows the color difference, with the three straight lines corresponding to three different wavelengths. It can be seen that the maximum deviation for the three different wavelengths of light is 4.5, which is within an acceptable range. The above diagrams demonstrate that the optical module 100 of the automotive headlight lens meets the manufacturing requirements.

[0040] According to some embodiments of this application, this application provides an automobile that includes the aforementioned vehicle headlight lens. Since the automobile incorporates all the technical solutions of all embodiments of the aforementioned vehicle headlight lens, it possesses at least all the beneficial effects brought by all the aforementioned technical solutions, which will not be elaborated upon here.

[0041] The above description is merely an optional embodiment of this application and does not limit the scope of protection of this application. Any equivalent structural transformations made based on the content of this application's specification and drawings under the concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of this application.

Claims

1. A vehicle headlight lens, characterized in that, The system includes an optical module comprising a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along an optical axis. The first lens and the fifth lens are both concave and convex lenses, and the convex surfaces of the first lens and the fifth lens are both convex along a first direction. The second lens is a double-sided concave lens, and the third lens and the fourth lens are both double-sided convex lenses. The first direction is the direction along the optical axis pointing towards the projection magnification side.

2. The vehicle headlight lens according to claim 1, characterized in that, The second lens includes a first concave surface facing the third lens, and the third lens includes a first convex surface facing the second lens. The shape of the first concave surface is adapted to the shape of the first convex surface, and the first concave surface is in contact with the first convex surface.

3. The vehicle headlight lens according to claim 1, characterized in that, The optical module also includes an optical modulation chip and an aperture, and the fourth lens, the fifth lens, the optical modulation chip and the aperture are arranged sequentially along the optical axis.

4. The vehicle headlight lens according to claim 3, characterized in that, The aperture is disposed on the end face of the fifth lens on the side opposite to the fourth lens.

5. The vehicle headlight lens according to claim 3, characterized in that, The aperture of the aperture is 30mm~40mm.

6. The vehicle headlight lens according to claim 1, characterized in that, The F-number of the optical module is 0.95 to 1.05; where F-number refers to the ratio of the lens focal length to the entrance pupil diameter.

7. The vehicle headlight lens according to claim 1, characterized in that, The absolute value of the focal length of the first lens is greater than 300mm, the absolute value of the focal length of the combined lens consisting of the second lens and the third lens is 30mm~90mm, the focal length of the fourth lens is 30mm~80mm, and the focal length of the fifth lens is 50mm~100mm; wherein, the focal length of the second lens is -30mm~-15mm, and the focal length of the third lens is 20mm~60mm.

8. The vehicle headlight lens according to claim 7, characterized in that, The first lens has a center thickness of 5mm to 15mm and an outer diameter of 37mm to 50mm; the second lens has a center thickness of 4.5mm to 8mm and an outer diameter of 37mm to 50mm; the third lens has a center thickness of 9mm to 16mm and an outer diameter of 37mm to 50mm; the fourth lens has a center thickness of 7mm to 12mm and an outer diameter of 37mm to 50mm; and the fifth lens has a center thickness of 5mm to 9mm and an outer diameter of 37mm to 50mm.

9. The vehicle headlight lens according to any one of claims 1 to 7, characterized in that, The third lens, the fourth lens, and the fifth lens are all lanthanide rare earth glass lenses, and the refractive index of the third lens, the fourth lens, and the fifth lens is greater than 1.

7.

10. The vehicle headlight lens according to any one of claims 1 to 7, characterized in that, The optical modulation chip is a DMD chip.

11. A car, characterized in that, The vehicle includes a headlight lens as claimed in any one of claims 1 to 10.

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