Vehicle projection lamp and vehicle

Abstract

The embodiment of the application provides a vehicle projection lamp and a vehicle; the vehicle projection lamp comprises an illumination light source, a collimating lens and a free-form lens array; the collimating lens is used for collimating the illumination light to form a parallel light beam and guiding the parallel light beam to the free-form lens array; the free-form lens array comprises a substrate and a plurality of free-form microlenses, the free-form lens array receives the parallel light beam, and through the refraction of the plurality of free-form microlenses, a predetermined illumination pattern is formed on a target projection surface; when the target projection surface is located in a far field, the distance from the free-form lens array to the target projection surface is greater than the diameter of the free-form lens array, and the surface type of each free-form microlens is the same surface type; when the target projection surface is located in a near field, the distance from the free-form lens array to the target projection surface is comparable to the diameter of the free-form lens array, and each free-form microlens is configured to have a respective independent surface type.

Description

Technical Field

[0001] This application relates to the field of vehicle projection technology, and more specifically, to a vehicle projection lamp and a vehicle. Background Technology

[0002] Existing automotive projection lights generally employ a complex optical structure to project ground patterns. This structure primarily consists of a sandwich structure formed by a dual microlens array (MLA) and a film. This traditional design suffers from significant technical drawbacks: First, its high structural complexity, encompassing multiple components such as a light source assembly, a condenser lens assembly, a deflector lens assembly, a film, and an imaging assembly, significantly increases manufacturing costs and assembly difficulties, hindering large-scale production and application. Second, the film, as a crucial light-shielding image layer, exhibits low energy utilization of incident light, resulting in wasted light energy and directly impacting the overall lighting effect and performance of the lamp. Therefore, there is an urgent market demand for a simplified automotive projection light design with higher light energy utilization. Summary of the Invention

[0003] The purpose of this application is to provide a new technology solution for automotive projection lighting and vehicles.

[0004] In a first aspect, this application provides a vehicle projection lamp. The vehicle projection lamp includes an illumination source, a collimating lens, and a freeform lens array arranged sequentially along the same optical axis;

[0005] The lighting source is used to emit lighting light;

[0006] The collimating lens is used to collimate the illumination light to form a parallel beam and guide the parallel beam to the freeform lens array;

[0007] The freeform lens array includes a substrate and a plurality of freeform microlenses disposed on the substrate. The freeform lens array receives a parallel beam of light projected from the collimating lens and forms a predetermined illumination pattern on the target projection surface through the refraction of the plurality of freeform microlenses.

[0008] When the target projection surface is located in the far field, the distance from the freeform lens array to the target projection surface is greater than the diameter of the freeform lens array, and the surface shape of each freeform microlens is the same.

[0009] When the target projection surface is in the near field, the distance from the freeform lens array to the target projection surface is equivalent to the diameter of the freeform lens array, and each freeform microlens is configured to have its own independent surface shape.

[0010] Optionally, the surface model of each of the freeform surface microlenses is as follows:

[0011]

[0012] Where (x, y) are the coordinates of each freeform microlens in a freeform surface coordinate system, with the center of each freeform surface as the origin; ω i，j P represents the weighting coefficient. i，j This is the set of control points in the x and y directions; and Let be the B-spline basis functions in the x and y directions.

[0013] Optionally, the recursive expression of the B-spline basis function is as follows:

[0014]

[0015] Where: u i For the nodes U = {u0, u1, ..., u...} in the parameter domain of the B-spline basis function, ... m}; Let p be the i-th p-th basis function, and p ≥ 3.

[0016] Optionally, by optimizing P in the surface model of the freeform microlens i，j The value of can be used to obtain the freeform surface shape corresponding to the lighting pattern.

[0017] Optionally, each of the freeform microlenses in the freeform lens array is configured to refract an incident parallel beam of light onto the target projection surface to form the same pattern, and all the same patterns are superimposed on the target projection surface to form the illumination pattern.

[0018] Optionally, the freeform lens array is divided into multiple sub-regions, wherein each sub-region contains at least one freeform microlens, and each sub-region projects the incident parallel beam of light onto the target projection surface through refraction to form a part of the illumination pattern, and finally forms the illumination pattern on the target projection surface by image stitching.

[0019] Optionally, each of the freeform microlenses in the freeform lens array is configured to deflect the incident parallel beam of light along the same direction and project it onto a specific position on the target projection surface to form the same pattern. All the same patterns are superimposed on the target projection surface to form the illumination pattern; wherein the illumination pattern is laterally shifted relative to the optical axis of the vehicle projection lamp.

[0020] Optionally, the vehicle projection lamp further includes a prism located on the side of the freeform lens array away from the collimating lens, or between the collimating lens and the freeform lens array, for causing the illumination pattern to shift laterally relative to the optical axis of the vehicle projection lamp.

[0021] Optionally, the plurality of freeform microlenses are located on the side of the substrate opposite to the collimating lens.

[0022] Secondly, this application provides a vehicle, the vehicle comprising:

[0023] As described in the first aspect, automotive projection lighting fixtures.

[0024] The beneficial effects of this application are as follows:

[0025] This application provides an automotive projection lamp, aiming to offer a simple, easy-to-assemble, and highly transmittance automotive lighting fixture. It achieves precise control of the parallel beam emitted by the lighting source and collimating lens, and efficient pattern projection through a freeform surface lens array, solving the problems of complex structure and low energy utilization in existing projection lamps. The automotive projection lamp provided in this application can form a clear and uniform lighting pattern and has good near-field and far-field adaptability, meeting projection requirements at different distances.

[0026] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0028] Figure 1 A schematic diagram of a vehicle projection lamp used for far-field imaging, provided in an embodiment of this application;

[0029] Figure 2 A schematic diagram of a vehicle projection lamp used for near-field imaging, provided in an embodiment of this application;

[0030] Figure 3 This is one of the structural schematic diagrams of the vehicle projection lamp provided in the embodiments of this application;

[0031] Figure 4 This is a second structural schematic diagram of the vehicle projection lamp provided in the embodiments of this application;

[0032] Figure 5 This is the third structural schematic diagram of the vehicle projection lamp provided in the embodiments of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Illumination source; 2. Collimating lens; 3. Freeform surface lens array; 31. Substrate; 32. Freeform surface microlens; 01. Illumination pattern. Detailed Implementation

[0035] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0036] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0037] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0038] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0040] The vehicle projection lamp and vehicle provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0041] According to one embodiment of this application, a vehicle projection lamp is provided; see [link to relevant documentation]. Figure 1 and Figure 2The vehicle projection lamp includes an illumination source 1, a collimating lens 2, and a freeform lens array 3 arranged sequentially along the same optical axis. The illumination source 1 emits illumination light. The collimating lens 2 collimates the illumination light to form a parallel beam and guides the parallel beam to the freeform lens array 3. The freeform lens array 3 includes a substrate 31 and a plurality of freeform microlenses 32 disposed on the substrate 31. The freeform lens array 3 receives the parallel beam projected from the collimating lens 2 and guides it through the plurality of freeform microlenses 32. The refraction of the curved microlens 32 forms a predetermined illumination pattern 01 on the target projection surface; when the target projection surface is in the far field, the distance from the freeform lens array 3 to the target projection surface is greater than the diameter of the freeform lens array 3, and each of the freeform microlenses 32 has the same surface shape; when the target projection surface is in the near field, the distance from the freeform lens array 3 to the target projection surface is equivalent to the diameter of the freeform lens array 3, and each of the freeform microlenses 32 is configured to have its own independent surface shape.

[0042] The automotive projection lamp provided in this application embodiment has an optical architecture design comprising an illumination source 1, at least one collimating lens 2, and a freeform lens array 3 arranged sequentially at intervals along the same optical axis. In other words, the core optical components of the automotive projection lamp provided in this application embodiment are arranged along the same optical axis. This optical architecture layout design ensures that the light rays used for projection, after being emitted from the illumination source 1 and collimated by the collimating lens 2, can be directly and efficiently shaped and projected through the freeform lens array 3, reducing light energy loss and optical path interference.

[0043] See Figures 3 to 5 The freeform lens array 3 is located on the light-emitting side of the collimating lens 2. This arrangement allows the light to be controlled by the freeform lens array 3 after leaving the collimating lens 2, which lays the foundation for the subsequent formation of a clear and accurate illumination pattern 01.

[0044] The freeform lens array 3 provided in this application embodiment is the main part of the entire vehicle projection lamp. The freeform lens array 3 mainly consists of a substrate 31 and a plurality of freeform microlenses 32 disposed on one side surface of the substrate 31. The surface shape of each freeform microlens 32 is carefully designed to control and shape the projected light, and finally form an illumination pattern 01 on the target projection surface.

[0045] In this application, because the freeform lens array 3 can precisely control the propagation path and distribution of light, the light from the illumination source 1 can be projected onto the target projection surface to the maximum extent and form an illumination pattern 01 (e.g., Figures 1 to 5 (The rightmost arrow in the image shows this), which significantly improves the utilization rate of light energy.

[0046] The lighting source 1 is, for example, an LED light source. LED light sources, with their advantages of high brightness, low power consumption, and long lifespan, are a preferred choice for the automotive projection lighting fixtures of this application.

[0047] The collimating lens 2 is positioned adjacent to the illumination source 1, and its main function is to collimate the diverging light emitted by the illumination source 1 into parallel light. This step is crucial for the subsequent formation of a clear pattern by the freeform lens array 3.

[0048] By using the collimating lens 2 to collimate the divergent light emitted from the illumination source 1 into parallel light, the utilization rate of light can be greatly improved. Parallel light can better match the design requirements of the freeform lens array 3, reduce light loss during transmission, and thus improve the overall illumination efficiency.

[0049] When collimated parallel light rays pass through the freeform lens array 3, they can form a clearer pattern. This is because the propagation path of the parallel light rays in the freeform lens array 3 is more consistent, reducing the blurring of the pattern caused by light divergence.

[0050] With the collimating lens 2, the design of the freeform lens array 3 can be simplified, allowing focus on optimizing the freeform microlens surface to achieve specific pattern effects without having to consider the impact of light divergence on pattern clarity.

[0051] The combination of the illumination source 1 and the collimating lens 2 improves the overall optical stability of the illumination assembly. This stability helps reduce light deviation caused by vibration or temperature changes during use, thereby ensuring the accuracy and consistency of pattern projection.

[0052] In this application, by designing the surface shape of each freeform microlens 32, precise shaping and projection of the projected light from the illumination source 1 can be achieved, thereby forming a clear and accurate illumination pattern 01 on the target projection surface. This capability is crucial for automotive projection lighting fixtures because it directly affects the user's visual experience and lighting effect.

[0053] Compared to the traditional sandwich structure using a dual-microlens array and a film, the automotive projection lamp proposed in this application is structurally simpler. Specifically, it can consist of only three main parts: the illumination source 1, the collimating lens 2, and the freeform surface lens array 3. This effectively reduces the number of optical components, thereby lowering the assembly difficulty and facilitating large-scale production and widespread application.

[0054] Furthermore, the design of the freeform lens array 3 is highly flexible, allowing for customization based on different lighting requirements and lighting patterns 01. This flexibility enables the automotive projection lamp of this application to be applicable to various vehicle models and lighting scenarios, meeting the diverse needs of the market.

[0055] The vehicle projection lamps provided in this application have adaptability to both near and far fields.

[0056] For far-field projection: When the target projection surface is located at a considerable distance (i.e., in the far field), the distance from the freeform lens array 3 to the target projection surface is greater than its diameter. In this case, to simplify the design and manufacturing process while ensuring the clarity and uniformity of the projected illumination pattern 01, the surface shape of each freeform microlens 32 is designed to be identical. This design allows for uniform light distribution during long-distance projection, forming a clear and consistent illumination pattern 01.

[0057] In the case of far-field projection described above, in practical applications, the distance from the freeform lens array 3 to the target projection surface is much greater than its diameter, for example, it can be at least 20 times greater than the diameter. In this case, the surface shape of each freeform microlens 32 on the freeform lens array 3 is designed to be the same or approximately the same.

[0058] For near-field projection: When the target projection surface is at a relatively close distance (i.e., near field), the distance from the freeform lens array 3 to the target projection surface is similar to or the same as its diameter. In this case, to achieve more complex illumination patterns and higher precision requirements, the surface shape of each freeform microlens 32 is independently designed. This personalized design allows each microlens to precisely control the refraction path of light, thereby forming a fine illumination pattern during near-field projection.

[0059] It should be noted that in this application, the cross-section of the freeform lens array 3 is circular; therefore, the size of the freeform lens array 3 refers to its diameter.

[0060] The vehicle projection lamp proposed in this application demonstrates significant technical advantages in terms of structure, light energy utilization, projection pattern clarity, ease of assembly, flexibility, and applicability, and has high application value and market potential.

[0061] In some examples of this application, the surface model of each of the freeform surface microlenses is as follows:

[0062]

[0063] Where (x, y) are the coordinates of each freeform microlens in a freeform surface coordinate system, with the center of each freeform surface as the origin; ω i，j P represents the weighting coefficient. i，j This is the set of control points in the x and y directions; and Let be the B-spline basis functions in the x and y directions.

[0064] This application describes an example of a scheme for defining the surface model of a freeform microlens 32, which is based on B-spline (NURBS) functions and a control point set P. i，j To construct the surface shape of each freeform microlens 32. The following is a detailed analysis of this example and a description of its technical effects.

[0065] Each of the freeform microlenses 32 has a freeform coordinate system with its center as the origin. The coordinates (x, y) represent any point in this coordinate system.

[0066] The surface model of the freeform surface provided in this application is defined by combining weighted B-spline basis functions with a control point set. Wherein, ω i，j These are weighting coefficients, which determine the degree of influence of each control point on the final freeform surface shape. i，j It is a set of control points in the x and y directions, which together determine the shape, i.e., the surface profile, of the freeform microlens 32.

[0067] and These are B-spline basis functions in the x and y directions. They are mathematical tools for constructing complex surfaces, providing smooth and controllable curves and surfaces.

[0068] B-spline basis functions: B-splines are piecewise functions based on polynomials, characterized by local controllability, smoothness, and flexibility. Here, B-spline basis functions are used to generate smooth surfaces based on a set of control points, while allowing fine-tuning of the surface shape by adjusting the weighting coefficients.

[0069] According to this example in the application, by adjusting the control point set P i，j and weighting coefficient ω i，j This allows for precise control over the shape of the freeform microlens surface 32. The use of B-spline basis functions ensures that the generated surface is smooth, without abrupt transitions or sharp points, which is crucial for reducing adverse effects such as scattering and diffraction in optical systems. The model allows for adaptation to different design requirements by simply modifying the control point set or weighting coefficients, providing great flexibility for freeform surfaces and enabling rapid optimization of the freeform microlens surface design.

[0070] This application describes a method for defining the surface profile of freeform microlenses based on B-splines and control point sets. This method offers advantages such as precise control, smoothness, flexibility, scalability, and efficient computation. These advantages make this method promising for broad applications in optical design, micro / nano fabrication, and other fields.

[0071] In some examples of this application, the recursive expression of the B-spline basis function is as follows:

[0072]

[0073] Where: u i For the nodes U = {u0, u1, ..., u...} in the parameter domain of the B-spline basis function, ... m}; Let p be the i-th p-th basis function, and p ≥ 3.

[0074] B-spline basis functions are piecewise functions based on polynomials used to generate smooth and controllable curves and surfaces. In this example of the application, the recursive expression of the B-spline basis function is used to define the i-th p-th basis function.

[0075] Recursive expressions are the core of B-spline basis functions, allowing complex basis functions to be generated through simple iterative computation. The u in the expression... i The nodes U = {u0, u1, ..., u2} represent the parameter domain of the B-spline basis functions. m These nodes define the segmental boundaries of the basis functions. Let p be the i-th p-th basis function, where p ≥ 3, representing the order of the basis function. The higher the order, the smoother the generated curve or surface, but the computational complexity will also increase accordingly.

[0076] Node U determines the segment positions and shapes of the B-spline basis functions. By adjusting the position and number of nodes, the number of segments and the length of each segment can be controlled, thus affecting the shape of the generated freeform surface.

[0077] In some examples of this application, P is optimized in the surface model of the freeform microlens 32. i，j The value of can be used to obtain the freeform surface shape corresponding to the lighting pattern 01.

[0078] In this application, the surface model of the freeform microlens is defined based on a series of mathematical functions and a set of control points. In this model, the control point set P i，j They play a crucial role in determining the shape of the surface of freeform microlenses.

[0079] The goal of optimization is to adjust the control point set P i，jThe value of allows the freeform microlens to form specific illumination patterns in the far or near field. This involves mathematical calculations and simulation processes, such as ray tracing simulations and parameter optimization algorithms.

[0080] The lighting pattern is the desired output of the optimization process; it can be any predetermined shape or pattern.

[0081] By precisely controlling the surface shape of the freeform microlens 32, highly customized lighting effects can be achieved.

[0082] By optimizing the control point set P i，j A value that allows for highly accurate lighting patterns can be obtained. This is crucial for applications requiring high-precision optical performance, such as welcome lights and optical projection.

[0083] Compared to traditional welcome lighting modules, the optical solution provided in this application embodiment can achieve complex lighting effects using only a single freeform lens array 3. This helps reduce the number of components, simplify the assembly process, and lower costs.

[0084] Furthermore, by eliminating light-blocking layers such as film, light utilization is improved. This allows the welcome lights to consume less energy while maintaining the same lighting effect.

[0085] See some examples in this application. Figure 3 Each of the freeform microlenses 32 in the freeform lens array 3 is configured to refract an incident parallel beam of light onto the target projection surface to form the same pattern, and all the same patterns are superimposed on the target projection surface to form the illumination pattern 01.

[0086] In this example of the application, see Figure 3 Each freeform microlens 32 in the freeform lens array 3 is configured to cause the received incident parallel beam (from the illumination source 1 and collimated by the collimating lens 2) to form the same pattern on the target projection surface (e.g., Figure 1 The arrow on the right represents illumination pattern 01. Ultimately, all the patterns formed by the freeform microlenses 32 are superimposed on the target projection surface to form illumination pattern 01.

[0087] In other words, each freeform microlens 32 can form on the target projection surface as shown in the figure. Figure 3 The arrow patterns shown on the right are formed by the superposition of all the arrow patterns formed by the freeform surface microlenses 32 on the target projection surface, ultimately forming... Figure 3 The arrow on the right side is the lighting pattern 01.

[0088] According to this example of the application, in the case of near-field projection, each freeform microlens 32 in the freeform lens array 3 can be individually designed to ensure that they can project incident light onto the target projection surface and form an identical pattern at that location. This consistency is key to achieving a high-quality projection effect. It should be noted that the light field of the final illumination pattern 01 is perpendicular to the optical axis of the automotive projection lamp.

[0089] Since each freeform microlens 32 can form the same pattern on the target projection surface, the illumination pattern 01 formed across the entire target projection surface exhibits a high degree of consistency. This consistency is crucial for enhancing visual effects and user experience.

[0090] See some examples in this application. Figure 4 The freeform lens array 3 is divided into multiple sub-regions, each of which contains at least one freeform microlens 32. Each sub-region projects the incident parallel light beam onto the target projection surface through refraction and forms a part of the illumination pattern 01. Finally, the illumination pattern 01 is formed by splicing the light beams onto the target projection surface.

[0091] In this example of the application, see Figure 4 The surface of the freeform lens array 3, which is equipped with freeform microlenses 32, is divided into multiple regions. Each region contains one or more freeform microlenses 32. Each region focuses or deflects incident light to form a part of the illumination pattern 01. Different regions form different parts of the target image, and finally, the complete illumination pattern 01 is formed by image stitching on the target projection surface. This division strategy in this example of the application helps to finely control the distribution of light on the target projection surface.

[0092] Each sub-region contains a freeform microlens 32 designed with a specific surface shape, capable of refracting and projecting the incident parallel light beam onto a predetermined position on the target projection surface. In this way, each sub-region can independently form a portion of the illumination pattern 01.

[0093] Specifically, see Figure 4 The arrow pattern shown on the right is the lighting pattern 01 formed on the target projection surface. It is clear that it is composed of multiple sub-patterns.

[0094] In other words, on the target projection surface, the partial patterns formed by all the sub-regions are stitched together to ultimately constitute a complete lighting pattern. This stitching method requires precise matching of the light distribution between each sub-region to ensure the integrity and clarity of the final lighting pattern 01.

[0095] The design of this example in this application brings unique and significant technical effects, which are analyzed in detail below:

[0096] By dividing the freeform lens array 3 into multiple sub-regions and designing the surface shape of the freeform microlens 32 in each sub-region, high-precision lighting patterns can be formed. Since each sub-region can independently form a part of the lighting pattern 01, light can be used more effectively and light waste can be reduced, which helps to improve the overall light efficiency of the welcome lights and reduce energy consumption.

[0097] The design strategy in this example allows designers to freely adjust the shape, size, and layout of the lighting pattern 01 according to specific needs. This makes it possible to develop products with unique lighting effects, helping to enhance the product's market competitiveness.

[0098] In summary, this application describes a method for dividing a freeform lens array 3 into multiple sub-regions and achieving high-precision pattern formation by designing the surface shape of the freeform microlens 32 in each sub-region. This method offers advantages such as high-precision pattern formation, improved light efficiency, simplified assembly process, enhanced design flexibility, and ease of maintenance and upgrades. These advantages make this method promising for wide applications in fields such as welcome lighting and optical projection.

[0099] See some examples in this application. Figure 5 Each of the freeform microlenses 32 in the freeform lens array 3 is configured to deflect the incident parallel beam of light along the same direction and project it to a specific position on the target projection surface to form the same pattern. All the same patterns are superimposed on the target projection surface to form the illumination pattern 01. The illumination pattern 01 is laterally shifted relative to the optical axis of the vehicle projection lamp.

[0100] This example in the application describes a specific configuration of a freeform lens array in a welcome light fixture; see [link to relevant documentation]. Figure 5 Each freeform microlens is designed to deflect an incident parallel beam of light in the same direction and project it onto a specific position on the target projection surface, forming an identical pattern. These identical patterns overlap on the target projection surface, ultimately forming an illumination pattern 01 with lateral displacement. (See Figure 01.) Figure 5 The arrow on the right.

[0101] Compared to the optical axis of automotive projection lights, Figure 5 The illumination pattern 01 shown has a lateral shift. This lateral shift is achieved through the precise design of the freeform microlens 32, without the need to add additional lenses or prisms to shift the light field.

[0102] The design in this example allows for precise lateral movement control of the lighting pattern 01, enabling adjustments to the lateral movement distance and direction to meet the needs of different application scenarios.

[0103] By superimposing multiple identical patterns of light onto the target projection surface, the brightness and clarity of the lighting pattern are enhanced, making the welcome lights more visible and attractive at night or in low-light environments.

[0104] The precise design of the freeform microlens 32 enables the beam to be deflected and projected in a predetermined direction. This beam control helps reduce light waste, improve light efficiency, and reduce energy consumption.

[0105] In some examples of this application, the vehicle projection lamp further includes a prism located on the side of the freeform lens array 3 away from the collimating lens 2, or between the collimating lens 2 and the freeform lens array, for causing the illumination pattern 01 to shift laterally relative to the optical axis of the vehicle projection lamp.

[0106] According to this example of the application, when the lighting pattern 01 is not on the optical axis, see [reference needed]. Figure 5 As shown by the arrow, the vehicle projection lamp of this application can also be designed to include a prism ( Figure 5 (Not shown in the image). This prism can be located on the side of the freeform lens array 3 opposite to the illumination component, or between the illumination component and the freeform lens array 3. Its main function is to adjust the direction of the light field of the illumination pattern 01 so that it can be projected to the correct position according to predetermined requirements.

[0107] The introduction of the prism can precisely control the projection position of the illumination pattern 01. Even if the light field of the illumination pattern 01 is not perpendicular to the optical axis or has a lateral shift, accurate projection can still be achieved by adjusting the prism.

[0108] Without a prism, achieving accurate projection of the illumination pattern 01 would likely require a more complex freeform lens array 3. However, the use of a prism can simplify the design complexity of the freeform lens array 3 and reduce manufacturing costs to some extent.

[0109] See some examples in this application. Figures 1 to 3 The plurality of freeform microlenses 32 are located on the side surface of the substrate 31 opposite to the lighting assembly.

[0110] The optical propagation path of the vehicle projection lamp provided in this application embodiment is as follows:

[0111] The collimating lens 2 collimates the light emitted by the LED light source 1 into parallel rays, which are then projected onto the freeform lens array 3. The freeform lens array 3 consists of multiple carefully designed freeform microlenses, each of which performs a specific focusing or deflection operation on the incident collimated light. The light processed by the freeform lens array 3 finally forms a clear and bright projected image on the target projection surface.

[0112] The vehicle projection lamp provided in this application embodiment introduces a specially designed freeform surface lens array 3 on the light-emitting side of the lighting component. Compared with the prior art, this design has at least the following significant advantages:

[0113] (1) The overall optical structure of the lamp is simplified and the production cost is reduced: The automotive projection lamp provided in this application greatly simplifies the overall structure of the lamp by using a freeform surface lens array 3 instead of the traditional double microlens array and film structure. This design reduces the number of optical components, which not only reduces the manufacturing cost, but also makes the assembly process simpler and faster, which is conducive to large-scale production and promotion.

[0114] (2) Improved light energy utilization: By removing the film as a light-blocking image layer, the automotive projection lamp of this application significantly improves the energy utilization of incident light. The freeform lens array 3 can more precisely control the propagation path and distribution of light, so that more light can be effectively projected to the predetermined position to form a clear and bright projection pattern, thereby improving the overall lighting effect and performance of the automotive projection lamp.

[0115] (3) Enhanced Applicability: The freeform surface lens array 3 of the automotive projection lamp provided in this application has high flexibility and can be customized according to different lighting needs and lighting patterns 01. Whether it is a simple geometric shape or a complex artistic pattern, precise projection can be achieved by adjusting the surface shape of the freeform surface microlens. In addition, the automotive projection lamp is also suitable for different installation positions and illumination angles, and can meet the needs of various lighting and decoration scenarios inside and outside the car.

[0116] (4) Optical Performance Optimization: The application of the freeform surface lens array 3 also helps to optimize the optical performance of the entire automotive projection lamp. By precisely designing the surface shape of each freeform surface microlens 32, precise control and shaping of light can be achieved, reducing stray light and glare, and improving the uniformity and clarity of the light spot. This not only enhances the user's visual experience but also improves the aesthetics and practicality of the lamp.

[0117] According to another embodiment of this application, a vehicle is provided, the vehicle including the vehicle projection lamp as described above.

[0118] The vehicle provided in this embodiment integrates the automotive projection lighting fixtures described in the previous embodiments, offering drivers and passengers a more unique riding experience through rich projection effects and application scenarios. Simultaneously, the automotive projection lighting fixtures can also enhance driving safety to a certain extent, and have broad market application prospects.

[0119] The specific implementation of the vehicle in this application can refer to the various embodiments of the above-described vehicle projection lamps, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0120] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0121] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A vehicle projection lamp, characterized in that, It includes an illumination source (1), a collimating lens (2), and a freeform lens array (3) arranged sequentially along the same optical axis; The lighting source (1) is used to emit lighting light; The collimating lens (2) is used to collimate the illumination light to form a parallel beam and guide the parallel beam to the freeform lens array (3). The freeform lens array (3) includes a substrate (31) and a plurality of freeform microlenses (32) disposed on the substrate (31). The freeform lens array (3) receives a parallel beam of light projected from the collimating lens (2) and forms a predetermined illumination pattern (01) on the target projection surface through the refraction of the plurality of freeform microlenses (32). When the target projection surface is located in the far field, the distance from the freeform lens array (3) to the target projection surface is greater than the diameter of the freeform lens array (3), and the surface shape of each freeform microlens (32) is the same. When the target projection surface is in the near field, the distance from the freeform lens array (3) to the target projection surface is equivalent to the diameter of the freeform lens array (3), and each freeform microlens (32) is configured to have its own independent surface shape; The surface model of each of the freeform surface microlenses is as follows: ； in:( x , y ω represents the coordinates of each freeform microlens in a freeform surface coordinate system, with the center of each freeform surface as the origin; i，j P represents the weighting coefficient. i，j for x and y A set of control points in two directions; and for x and y B-spline basis functions in the direction.

2. The vehicle projection lamp according to claim 1, characterized in that, The recursive expression for the B-spline basis function is as follows: ； in: u i For the nodes of the parameter domain of the B-spline basis function U ={ u 0, u 1, ..., u m }; For the first i indivual p Order basis functions, and p ≥3.

3. The vehicle projection lamp according to claim 1, characterized in that, By optimizing the surface model of the freeform microlens (32), the P... i，j The value of can be used to obtain the freeform surface shape corresponding to the lighting pattern (01).

4. The vehicle projection lamp according to claim 3, characterized in that, Each of the freeform microlenses (32) in the freeform lens array (3) is configured to refract an incident parallel beam of light onto the target projection surface to form the same pattern, and all the same patterns are superimposed on the target projection surface to form the illumination pattern (01).

5. The vehicle projection lamp according to claim 3, characterized in that, The freeform lens array (3) is divided into multiple sub-regions, wherein each sub-region contains at least one freeform microlens (32), and each sub-region projects the incident parallel beam onto the target projection surface through refraction to form a part of the illumination pattern (01), and finally forms the illumination pattern (01) by image stitching on the target projection surface.

6. The vehicle projection lamp according to claim 3, characterized in that, Each of the freeform microlenses (32) in the freeform lens array (3) is configured to deflect the incident parallel beam of light along the same direction and project it to a specific position on the target projection surface to form the same pattern. All the same patterns are superimposed on the target projection surface to form the illumination pattern (01); wherein the illumination pattern (01) is laterally shifted relative to the optical axis of the vehicle projection lamp.

7. The vehicle projection lamp according to claim 4, characterized in that, The vehicle projection lamp also includes a prism, which is located on the side of the freeform lens array (3) away from the collimating lens (2), or between the collimating lens (2) and the freeform lens array, for causing the illumination pattern (01) to shift laterally relative to the optical axis of the vehicle projection lamp.

8. The vehicle projection lamp according to claim 1, characterized in that, The plurality of freeform microlenses (32) are located on the side surface of the substrate (31) opposite to the collimating lens (2).

9. A vehicle, characterized in that, include: The vehicle projection lamp as described in any one of claims 1 to 8.

Images