Vehicle-mounted projection lens and vehicle lamp using same

Abstract

The invention belongs to the technical field of vehicle lamps, and particularly relates to a vehicle-mounted projection lens and a vehicle lamp using the vehicle-mounted projection lens, and the vehicle-mounted projection lens at least comprises a first micro-lens array layer and a second micro-lens array layer which are sequentially arranged from the image side to the object side in the optical axis direction; wherein the first micro-lens array layer comprises a first aspheric lens group, a first plane lens and a second aspheric lens group which are sequentially arranged from the image side to the object side in the optical axis direction; the second micro lens array comprises a third aspheric lens group, a second plane lens and a fourth aspheric lens group which are sequentially arranged from the image side to the object side in the optical axis direction; a micro lens pattern layer is designed on the surface, facing the fourth aspheric lens group, of the second plane lens. According to the vehicle-mounted projection lens, on the premise that miniaturization of the vehicle-mounted projection lens is kept, the field angle is remarkably improved, and meanwhile high imaging quality and high light efficiency are both considered.

Description

Technical Field

[0001] This invention belongs to the field of automotive lighting technology, specifically relating to an in-vehicle projection lens and an automotive light using the same. Background Technology

[0002] With the rapid development of automotive intelligence and interactive technologies, the function of car lights has gradually evolved from traditional illumination and signal indication to a core carrier for information interaction between vehicles and their surrounding environment and pedestrians. It is also a crucial component for improving vehicle driving safety and enhancing the driving experience. In-vehicle ground projection technology, as a key direction for upgrading car light functions, can project clear images, light spots, guide lines, or text information onto the ground around the vehicle, achieving multi-dimensional practical functions: projecting warning light carpets to the sides of the doors provides intuitive safety warnings to vehicles and pedestrians behind, reducing safety hazards associated with opening doors and pulling over; projecting welcome animations, battery level, vehicle status, and other text and graphic information in front of the vehicle enables user-friendly human-vehicle interaction, enhancing the driving experience; and projecting reversing guide lines, turning trajectory lines, and vehicle width outlines helps drivers accurately judge vehicle posture, driving path, and surrounding distances, improving the accuracy and safety of assisted driving.

[0003] Currently, the main methods for implementing vehicle-mounted ground projection technology include microlens array (MLA) projection, film projection, DLP (Digital Light Processing) projection, and freeform surface projection. Among them, microlens array projection, due to its advantages of small size, high luminous efficiency, high uniformity of projection patterns, and high degree of design freedom, can meet the stringent requirements of miniaturization and integration of optical modules in vehicle scenarios, and has become the core direction and important prospect for the development of vehicle-mounted projection lighting technology. It has already been initially applied in vehicle-mounted products such as turn signal projection lights and welcome light carpet lights.

[0004] However, existing microlens array projection technology still suffers from a core technical problem of limited field of view in practical automotive applications. This problem severely restricts its application expansion in large-scale automotive projection. Existing technologies for improving the field of view of microlens array projection mainly fall into three categories, but all of them have significant technical defects and application limitations. They struggle to simultaneously meet the comprehensive requirements of automotive scenarios for a large field of view, high image quality, miniaturization, low processing cost, and easy mass production. Specific defects are as follows: Traditional automotive projection uses a single-layer microlens array structure, a basic solution with a limited field of view. Its maximum achievable field of view is only about 20°, far from meeting the application requirements of large-scale automotive projection. Attempting to increase the field of view by splicing multiple modules would not only significantly increase the overall size of the projection optical system, contradicting the miniaturization and integration requirements of automotive lights, but also lead to problems such as focusing difficulties at the splicing points, misalignment of the projected pattern, and cumulative light loss. Furthermore, it would substantially increase the manufacturing cost and assembly difficulty of the modules, lacking practical mass production application value. Moreover, attempts to improve the field of view using a single-layer microlens array structure can result in a dual deterioration of image quality and light efficiency, with aberrations such as spherical aberration, coma, and distortion becoming more prominent, significantly reducing the clarity and uniformity of the projected pattern and negating the core technological advantages of microlens array projection.

[0005] Some existing technologies attempt to improve the field of view by increasing the number of microlens array layers to design a three-layer microlens array system. While this has achieved some success in improving the field of view, it has brought new technical problems: the three-layer array structure significantly increases the overall size of the optical system, making it unsuitable for the limited installation space of automotive lights; the processing precision requirements of multi-layer arrays increase exponentially, greatly increasing the difficulty of alignment and assembly of each microlens layer and significantly reducing the processing yield; at the same time, the cost of molds, fixtures, and processing equipment for three-layer structures increases exponentially, resulting in high overall production costs and making it difficult to achieve mass production.

[0006] Existing technologies (such as CN217846868U) address the low field of view by adding a microprism array to a microlens array, achieving large-scale pattern projection in a non-tilted state. However, the core drawback of this approach is that the addition of the microprism array significantly increases the overall structural complexity and size of the optical system, undermining the core advantage of miniaturization of the microlens array. Furthermore, the composite processing of the microprism array and microlens array requires extremely high precision in mold making and assembly alignment, making processing difficult and yield rates hard to guarantee. Additionally, the extra prism structure introduces additional light loss and new aberrations, leading to a decrease in projection image quality. Moreover, the increased overall manufacturing cost makes this approach uncompetitive in the market.

[0007] In addition, some existing improved microlens array projection technologies (such as CN117588698A) combine light source arrays, focusing lens arrays and multi-layer microlens array groups to design non-tilted MLA dynamic projection devices. Although this solves the problems of process difficulty and low magnification and achieves dynamic projection effect, the core design focus of this solution is on the dynamic projection function, and the improvement effect on the field of view is limited. Moreover, the system structure includes multiple modules of light source, focusing and projection, which are large in size and have low integration, making it difficult to adapt to the application scenarios of vehicle lights.

[0008] In summary, none of the existing solutions for automotive microlens array projection technology can simultaneously meet the core requirements of automotive scenarios, such as a wide field of view, high image quality, miniaturization, low processing cost, and easy mass production. The industry urgently needs a new microlens array optical system design that can effectively improve the field of view with a simple structure and controllable processing cost, while ensuring high image quality and high light efficiency of the projection, and adapt to the actual application needs of automotive projection lights. Summary of the Invention

[0009] The first objective of this invention is to provide a vehicle-mounted projection lens to solve the technical problem of significantly improving the field of view while maintaining the miniaturization of the vehicle-mounted projection lens, and at the same time taking into account high imaging quality and high light efficiency.

[0010] The second objective of this invention is to provide a vehicle lamp that solves the technical problem of balancing high imaging quality and high luminous efficiency.

[0011] The vehicle-mounted projection lens of this invention is implemented as follows: A vehicle-mounted projection lens includes at least: a first microlens array layer and a second microlens array layer sequentially disposed along the optical axis from the image side to the object side; wherein The first microlens array layer includes a first aspherical lens group, a first planar lens, and a second aspherical lens group arranged sequentially from the image side to the object side along the optical axis; the second microlens array includes a third aspherical lens group, a second planar lens, and a fourth aspherical lens group arranged sequentially from the image side to the object side along the optical axis. The surface of the second planar lens facing the fourth aspherical lens group is designed with a microlens pattern layer.

[0012] In an optional embodiment of the present invention, the first aspherical lens group includes a plurality of first aspherical lenses arranged in an array, and the second aspherical lens group includes a plurality of second aspherical lenses arranged in an array. Multiple first aspherical lenses and multiple second aspherical lenses are distributed in a one-to-one manner on both sides of the first planar lens; The third aspherical lens group includes multiple third aspherical lenses arranged in an array, and the fourth aspherical lens group includes multiple fourth aspherical lenses arranged in an array. Multiple third aspherical lenses and multiple fourth aspherical lenses are distributed in a one-to-one manner on both sides of the second planar lens.

[0013] In an optional embodiment of the present invention, the first aspherical lens and the third aspherical lens are convex lenses with positive optical power; and the second aspherical lens and the fourth aspherical lens are convex lenses with negative optical power.

[0014] In optional embodiments of the present invention, the refractive indices of the materials of the first aspherical lens, the second aspherical lens, the third aspherical lens, and the fourth aspherical lens are all 1.45 to 1.65, and the Abbe numbers are all 45 to 65.

[0015] In an optional embodiment of the present invention, the first planar lens and the second planar lens are planar glass lenses made of the same material; and The first and second planar lenses are made of materials with a refractive index of 1.4 to 1.5 and an Abbe number of 50 to 70.

[0016] In an optional embodiment of the present invention, an aperture stop is further provided between the first aspherical lens group and the first planar lens.

[0017] In an optional embodiment of the present invention, the F-number of the vehicle-mounted projection lens is 1.2 to 1.4.

[0018] In an optional embodiment of the present invention, the full field of view of the vehicle-mounted projection lens is between 20° and 42°, and the relative illuminance at the edge field of view is not less than 91% of that at the center field of view.

[0019] In an optional embodiment of the present invention, the distortion of the vehicle-mounted projection lens at the maximum field of view is less than 4%, and the chromatic aberration along the vertical axis is less than 2.5 μm.

[0020] The vehicle lights of this invention are implemented as follows: A vehicle headlight, comprising at least: the vehicle-mounted projection lens.

[0021] The beneficial effects of this invention are as follows: First, the vehicle-mounted projection lens and the vehicle headlight using it provided by this invention can balance a large field of view and high image quality. The dual-layer optical structure, composed of a first microlens array layer and a second microlens array layer, more than doubles the field of view, meeting the actual needs of large-scene projection in vehicles. Simultaneously, through the precise design of the combination of aspherical and planar lenses, optical aberrations such as spherical aberration, coma, astigmatism, and field curvature are effectively compensated, achieving high-quality projection with a large field of view and solving the problem of imbalance between field of view and image quality in existing technologies. Secondly, it can coordinate high luminous efficiency and low aberrations. The dual-layer optical structure sacrifices only a small portion of luminous efficiency. Through the rational selection of optical materials and the precise design of optical surfaces, aberrations such as chromatic aberration and distortion are effectively controlled, achieving high luminous efficiency while maintaining low aberrations, meeting the actual luminous efficiency requirements of vehicle projection. Furthermore, the minimalist design of the dual-layer optical structure reduces the number of optical components and lowers the processing costs of these components. The vehicle projection lens of this invention is designed specifically for vehicle projection scenarios and can be directly applied to ground projection of vehicle lights to achieve diverse functions such as safety warnings, human-vehicle interaction, and driver assistance. It is compatible with all application scenarios of microlens array vehicle projection technology, and the system's F-number, field of view, image quality and other parameters can be finely adjusted within the design range according to actual vehicle requirements, giving it strong scene adaptability.

[0022] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the vehicle-mounted projection lens disclosed in this invention; Figure 2 This is a schematic diagram of the structure of the first aspherical lens group and the first planar lens of the first microlens array layer of the vehicle projection lens disclosed in this invention. Figure 3This is a schematic diagram of the structure of the second aspherical lens group and the first planar lens of the first microlens array layer of the vehicle projection lens disclosed in this invention. Figure 4 This is a schematic diagram of the layout structure of the first microlens array layer and the second microlens array layer of the vehicle-mounted projection lens disclosed in this invention. Figure 5 This is a schematic diagram of the overall structure formed by fixing the first microlens array layer and the second microlens array layer of the vehicle projection lens disclosed in this invention together. Figure 6 This is a schematic diagram of the distortion of the vehicle-mounted projection lens disclosed in Embodiment 1 of the present invention; Figure 7 This is a test chart of the MTF performance of the vehicle-mounted projection lens disclosed in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the vertical chromatic aberration of the vehicle-mounted projection lens disclosed in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the relative illumination of the vehicle-mounted projection lens disclosed in Embodiment 1 of the present invention.

[0026] In the figure: First aspherical lens 1, First plane lens 2, Second aspherical lens 3, Third aspherical lens 4, Second plane lens 5, Fourth aspherical lens 6. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Please see Figures 1 to 9 As shown, this embodiment provides a vehicle-mounted projection lens, which includes at least: a first microlens array layer and a second microlens array layer arranged sequentially from the image side to the object side along the optical axis; wherein the first microlens array layer includes a first aspherical lens group, a first planar lens 2 and a second aspherical lens group arranged sequentially from the image side to the object side along the optical axis; the second microlens array includes a third aspherical lens group, a second planar lens 5 and a fourth aspherical lens group arranged sequentially from the image side to the object side along the optical axis.

[0029] More specifically, the first aspherical lens group includes multiple first aspherical lenses 1 arranged in an array, and the second aspherical lens group includes multiple second aspherical lenses 3 arranged in an array; the multiple first aspherical lenses 1 and multiple second aspherical lenses 3 are arranged one-to-one on both sides of the first planar lens 2. The third aspherical lens group includes multiple third aspherical lenses 4 arranged in an array, and the fourth aspherical lens group includes multiple fourth aspherical lenses 6 arranged in an array; the multiple third aspherical lenses 4 and multiple fourth aspherical lenses 6 are arranged one-to-one on both sides of the second planar lens 5. Based on this structure, it should be noted that the surface of the second planar lens 5 facing the fourth aspherical lens 6 is designed with a microlens pattern layer to carry the image information to be projected.

[0030] Based on the above structure, in one optional embodiment, a plurality of first aspherical lenses 1 are cemented together with a first planar lens 2, and the first planar lens 2 is cemented together with a plurality of second aspherical lenses 3; a plurality of third aspherical lenses 4 are cemented together with a second planar lens 5, and the second planar lens 5 is cemented together with a plurality of fourth aspherical lenses 6.

[0031] Referring to the accompanying diagram, a specific optional configuration is provided: the first aspherical lens 1 and the third aspherical lens 4 are convex lenses with positive optical power; and the second aspherical lens 3 and the fourth aspherical lens 6 are convex lenses with negative optical power. Based on this, the reasonable allocation of positive and negative optical power can effectively balance system aberrations and improve image quality. The refractive indices of the materials used for the first aspherical lens 1, the second aspherical lens 3, the third aspherical lens 4, and the fourth aspherical lens 6 are all 1.45–1.65, and their Abbe numbers are all 45–65. Therefore, the first aspherical lens 1, the second aspherical lens 3, the third aspherical lens 4, and the fourth aspherical lens 6 can be made of the same low-refractive-index, high-dispersion material. Using a material with a higher Abbe number can effectively control chromatic aberration, while the low refractive index helps reduce distortion. Furthermore, since all the aspherical lenses have the same shape, molds and fixtures can be shared, reducing production costs.

[0032] It should be noted that the first planar lens 2 and the second planar lens 5 are planar glass lenses made of the same material; and the refractive index of the materials of the first planar lens 2 and the second planar lens 5 is 1.4 to 1.5, and the Abbe number is 50 to 70. Using materials with higher Abbe numbers for the first planar lens 2 and the second planar lens 5 can effectively control chromatic aberration, while the low refractive index helps reduce distortion. Furthermore, the first planar lens 2 and the second planar lens 5 can optionally be lenses with identical shapes and structures, allowing them to share molds and fixtures, thus reducing production costs. The thickness of both the first planar lens 2 and the second planar lens 5 can be 0.75 mm, which not only serves a fixing function but also effectively reduces optical crosstalk between microlenses, improving system stability.

[0033] Based on the above structure, it should also be noted that this embodiment further includes an aperture stop between the first aspherical lens 1 and the first planar lens 2. This front aperture stop design effectively reduces the system aperture and overall size, facilitating integration into various automotive lighting systems.

[0034] Based on the above design, the F-number of the vehicle-mounted projection lens in this embodiment is between 1.2 and 1.4, and the full field of view is between 20° and 40°. Compared with the 20° field of view of existing single-layer microlens array systems, this embodiment can more than double the field of view, meeting the needs of large-scene projection.

[0035] In one specific implementation, the specific parameters of each optical surface in this embodiment are shown in Table 1:

[0036] In this embodiment, the first aspherical lens 1 and the third aspherical lens 4 are convex lenses with positive optical power; and the second aspherical lens 3 and the fourth aspherical lens 6 are convex lenses with negative optical power. The four aspherical lenses are made of the same material and have the same shape and structure. The material has a refractive index of 1.51 and an Abbe number of 55, which are in the refractive index range of 1.45 to 1.65 and the Abbe number range of 45 to 65.

[0037] The aspherical surface shapes of the first aspherical lens 1, the second aspherical lens 3, the third aspherical lens 4, and the fourth aspherical lens 6 satisfy the following formula: (The aspherical formula is as follows:)

[0038] Where k represents the conic coefficient of the lens, and c represents the vertex curvature, neither of which introduces higher-order aspherical coefficients, reducing the actual production difficulty and cost. The parameters are shown in Table 2:

[0039] The aspherical formula in this embodiment does not introduce higher-order aspherical coefficients, which reduces the actual production difficulty and cost, while effectively compensating for the system's spherical aberration, coma, and astigmatism.

[0040] The optical simulation in this embodiment is based on a combination of an ideal point light source and an ideal collimating lens. Standard parallel light is incident on a double-layer microlens array system, and the optical performance of the system is comprehensively tested. The test results are as follows: Regarding distortion performance: See [link / reference] Figure 6 As shown, the distortion of the system in this embodiment is 4% at the maximum field of view, which is extremely low. The amount of deformation between the projected pattern and the original image is small, ensuring the accuracy of the projected pattern.

[0041] Regarding MTF performance: See [link / reference] Figure 7 As shown, the modulation transfer function values ​​of all fields of view at 14.4 lp / mm are all above 0.9, indicating that the system can still maintain extremely high pattern contrast, clear projection details, and excellent image quality even at high characteristic frequencies.

[0042] Regarding color difference performance: See [link / reference] Figure 8 As shown, the blue-green difference at the edge of the field of view is 2.5μm, and the red-green difference is 1.1μm. The color difference values ​​are all controlled within an extremely low range, the projected pattern has no obvious color edges, and the color reproduction is high.

[0043] Regarding illuminance performance: See [link / reference] Figure 9 As shown, the relative illuminance at the maximum field of view reaches over 91%, and the illuminance uniformity between the edge and center fields of view is good with no significant brightness attenuation, ensuring consistent projection brightness across a large field of view.

[0044] Regarding optical crosstalk: The low refractive index and high dispersion design of the first planar lens 2 and the second planar lens 5 effectively reduces optical crosstalk between microlenses, resulting in no ghosting or blurring of the projected pattern and excellent uniformity.

[0045] In summary, this embodiment, through the optimized structure and material combination of the dual-layer microlens array system, achieves excellent optical performance with a field of view of ±42°, MTF > 0.9@14.4lp / mm, distortion less than 4%, and relative illumination at the edge field of view not less than 91% of that at the center field of view, while maintaining system miniaturization. This effectively solves the problem of difficulty in balancing field of view and imaging quality in the prior art.

[0046] Example 2: Based on the vehicle-mounted projection lens of Embodiment 1, the vehicle-mounted projection lens provided in this embodiment is largely the same as that of Embodiment 1, except that some parameters have been adjusted to verify the scope of implementation of the present invention.

[0047] In this embodiment, the refractive index of the materials for the first aspherical lens 1, the second aspherical lens 3, the third aspherical lens 4, and the fourth aspherical lens 6 is selected to be 1.62, and the Abbe number is 48; the refractive index of the materials for the first plane lens 2 and the second plane lens 5 is selected to be 1.45, and the Abbe number is 68. The system F-number is 1.38, and the full field of view is ±40°.

[0048] Based on the above parameter design, optical performance simulation results show that the system in this embodiment has an MTF > 0.88@14.4lp / mm across the entire field of view, a distortion of 3.8% at the maximum field of view, and a relative illumination of 92% at the edge field of view. All performance indicators still meet the high requirements of vehicle-mounted projection, proving that the technical solution of this invention has good parameter adaptability.

[0049] Example 3: Based on the vehicle-mounted projection lens of Embodiment 1 or Embodiment 2, this embodiment provides a vehicle light, which includes at least the vehicle-mounted projection lens of Embodiment 1 or Embodiment 2.

[0050] In general, the vehicle headlights in this embodiment include an LED light source, a collimating lens group, and an in-vehicle projection lens as described in Embodiment 1 or Embodiment 2. The light emitted by the LED light source is collimated by the collimating lens group and then incident on the in-vehicle projection lens. The image information on the microlens pattern layer on the surface of the second planar lens 5 facing the fourth aspherical lens 6 is projected onto the ground around the vehicle, realizing functions such as welcome light carpet and turn signal.

[0051] The headlight in this embodiment is small in size and can be easily integrated into locations such as rearview mirrors, lower door panels, or front and rear bumpers. Actual illumination tests show that the headlight can project a clear, uniform, and distortion-free pattern onto the ground at a distance of 0.5 to 2 meters from the vehicle, covering a field of view of approximately 1.5 meters × 1.0 meter, meeting the needs of automotive applications. It can be widely used in various passenger and commercial vehicles as headlights, signal lights, welcome lights, ambient lighting, etc., to achieve functions such as safety warnings, human-vehicle interaction, and driver assistance. The system is compact, cost-effective, and produces high-quality images, demonstrating good industrial applicability.

[0052] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure below should be considered as the inventor's contribution to this disclosure.

[0053] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0054] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0055] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0056] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0057] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

Claims

1. A vehicle-mounted projection lens, characterized in that, It includes at least: a first microlens array layer and a second microlens array layer sequentially arranged along the optical axis from the image side to the object side; wherein The first microlens array layer includes a first aspherical lens group, a first planar lens, and a second aspherical lens group arranged sequentially from the image side to the object side along the optical axis; the second microlens array includes a third aspherical lens group, a second planar lens, and a fourth aspherical lens group arranged sequentially from the image side to the object side along the optical axis. The surface of the second planar lens facing the fourth aspherical lens group is designed with a microlens pattern layer.

2. The vehicle-mounted projection lens according to claim 1, characterized in that, The first aspherical lens group includes a plurality of first aspherical lenses arranged in an array, and the second aspherical lens group includes a plurality of second aspherical lenses arranged in an array. Multiple first aspherical lenses and multiple second aspherical lenses are distributed in a one-to-one manner on both sides of the first planar lens; The third aspherical lens group includes multiple third aspherical lenses arranged in an array, and the fourth aspherical lens group includes multiple fourth aspherical lenses arranged in an array. Multiple third aspherical lenses and multiple fourth aspherical lenses are distributed in a one-to-one manner on both sides of the second planar lens.

3. The vehicle-mounted projection lens according to claim 2, characterized in that, The first aspherical lens and the third aspherical lens are convex lenses with positive optical power; and the second aspherical lens and the fourth aspherical lens are convex lenses with negative optical power.

4. The vehicle-mounted projection lens according to claim 3, characterized in that, The refractive indices of the materials used for the first, second, third, and fourth aspherical lenses are all between 1.45 and 1.65, and the Abbe numbers are all between 45 and 65.

5. The vehicle-mounted projection lens according to any one of claims 2 to 4, characterized in that, The first and second plane lenses are plane glass lenses made of the same material; and The first and second planar lenses are made of materials with a refractive index of 1.4 to 1.5 and an Abbe number of 50 to 70.

6. The vehicle-mounted projection lens according to any one of claims 1 to 4, characterized in that, An aperture stop is also provided between the first aspherical lens group and the first planar lens.

7. The vehicle-mounted projection lens according to claim 1 or 2, characterized in that, The F-number of the vehicle-mounted projection lens is 1.2 to 1.

4.

8. The vehicle-mounted projection lens according to claim 1 or 2, characterized in that, The full field of view of the vehicle-mounted projection lens is between 20° and 42°, and the relative illuminance at the edge field of view is not less than 91% of that at the center field of view.

9. The vehicle-mounted projection lens according to claim 8, characterized in that, The vehicle-mounted projection lens exhibits distortion of less than 4% at its maximum field of view and a chromatic aberration of less than 2.5μm along its vertical axis.

10. A vehicle light, characterized in that, At least including: The vehicle-mounted projection lens as described in any one of claims 1 to 9.

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