A high-utilization simple-structure automobile diffuse reflection headlight optical system and headlight

Abstract

The application provides a high-utilization simple-structure automobile diffuse reflection car light optical system and car light, and belongs to the technical field of automobile car light optics. The system comprises a collimating light source, a light guide and a diffuse reflection plate. The light guide is made of transparent optical material. Parallel light beams from the collimating light source are totally reflected by a first pattern surface and a second pattern surface in the light guide in sequence, and are refracted by a third pattern surface to be emitted and irradiated to the diffuse reflection plate, so that the main optical axis direction of the light intensity distribution of Lambertian reflection through the diffuse reflection plate is a preset direction. The structure of the light guide and the mounting / placement angle of the diffuse reflection plate are adaptively designed, and the angle design satisfies specific total reflection / refraction constraint conditions. The application utilizes the total reflection principle to realize lossless conduction and accurate turning of the light path in a single light guide, and has the outstanding advantages of simple and compact structure, high light energy utilization, low production cost, convenient installation and large optical design freedom.

Description

Technical Field

[0001] This invention relates to the field of automotive lighting technology, specifically to a high-utilization, simple-structure automotive diffuse reflection lighting system and headlight. Background Technology

[0002] In the automotive lighting industry, diffuse reflection technology is widely used to enhance the visual effect of headlights. However, due to limitations imposed by factors such as installation space, appearance design, and regulatory standards, diffuse reflection technology is currently only widely used in interior lights where there are no regulatory requirements and the brightness requirement is low. Its application in exterior automotive lights is extremely limited. The core problem that the industry urgently needs to solve is: how to achieve uniform diffuse reflection of LED light sources within narrow installation dimensions, while simultaneously improving the light utilization rate of LED light sources and simplifying the positioning and installation process of headlights.

[0003] In existing technologies, such as the patent with publication number CN121112221A, a diffuse reflection uniform light emission vehicle lamp optical system is proposed. This system consists of an aluminum-plated reflector bowl, a fogging inner radiator, and a diffuse reflection plate. The light emitted by the LED light source is reflected 2 to 3 times by the aluminum-plated reflector bowl and homogenized by the fogging inner radiator before being diffusely reflected by the diffuse reflection plate. However, this technical solution has obvious drawbacks: First, the light loses a lot of energy after multiple aluminum-plated reflections and homogenization by the fogging inner radiator, resulting in extremely low light utilization. Second, the system requires a homogenizing plate, and the reflector surface needs to be aluminum-plated, which significantly increases material and process costs. Third, the lighting unit structure composed of the reflector bowl and homogenizing plate is complex, the installation process is cumbersome, and the installation space requirement is large, making it unsuitable for the narrow lighting installation area of ​​automobiles.

[0004] In summary, existing diffuse reflection automotive lighting systems suffer from low light utilization, high cost, complex installation, and poor spatial adaptability, making it difficult to meet the application requirements of automotive exterior lighting. There is an urgent need for a diffuse reflection automotive lighting system that is structurally simplified, has high light utilization, is compact in size, and is highly adaptable. Summary of the Invention

[0005] The purpose of this invention is to overcome at least one technical problem existing in the prior art and to provide a high-utilization, simple-structure automotive diffuse reflection lighting system and headlight.

[0006] On one hand, embodiments of the present invention provide a high-utilization, simple-structure automotive diffuse reflection headlight optical system. The optical system includes a collimating light source, a light guide, and a diffuser. The collimating light source generates a parallel light beam. The light guide includes an incident surface, a first patterned surface, a second patterned surface, and a third patterned surface. The light guide is configured such that a parallel light beam entering from the incident surface sequentially strikes the first patterned surface, undergoes total internal reflection at the first patterned surface, the reflected light strikes the second patterned surface, undergoes total internal reflection at the second patterned surface, and the reflected light strikes the third patterned surface. The light guide is refracted through the third patterned surface, and the refracted light is incident on the diffuse reflector, so that the principal axis of the light intensity distribution after the Lambert reflection by the diffuse reflector is in a preset direction; and the constraint condition in the process of adapting the design of the light guide structure is that the incident angle of the parallel beam on the first patterned surface is greater than or equal to the critical angle of total internal reflection, the incident angle of the beam reflected by the first patterned surface on the second patterned surface is greater than or equal to the critical angle of total internal reflection, and the incident angle of the beam reflected by the second patterned surface on the third patterned surface is less than the critical angle of total internal reflection.

[0007] Furthermore, the collimated light source includes at least one light-emitting element and a collimating optical component located in its light-emitting direction, wherein the collimating optical component is selected from Fresnel lenses, freeform lenses or total internal reflection lenses.

[0008] Furthermore, in order to ensure that the principal optical axis direction of the light intensity distribution after Lambertian reflection by the diffuse reflector is a preset direction, the structure of the light guide and the installation / placement angle of the diffuse reflector are adapted to be designed, including adapting the angle between the first patterned surface and the horizontal reference surface, the angle between the second patterned surface and the vertical reference surface, the angle between the third patterned surface and the horizontal reference surface, and the angle between the diffuse reflector and the vertical reference surface.

[0009] Furthermore, the first, second, and third patterned surfaces are planar and / or stepped oblique arc surfaces; the stepped oblique arc surface structure is composed of multiple sequentially arranged sub-optical surfaces, each of which is an oblique arc surface with curvature. By adjusting the tilt angle and / or curvature of each sub-optical surface, the uniformity of the light spot shape and intensity distribution incident on the diffuse reflector is controlled; the deflection angle of a single beam is controlled by adjusting the tilt angle of the sub-optical surface, and beam diffusion is achieved by adjusting the curvature of the sub-optical surface, with the curvature of the sub-optical surface being positively correlated with the light scattering angle of the beam.

[0010] Furthermore, the refractive index of the light guide is defined as n1, the refractive index of the surrounding medium is n2, and the critical angle for total internal reflection is defined as... The angle between the first patterned surface and the horizontal reference surface is A, the angle between the second patterned surface and the vertical reference surface is B, and the angle between the third patterned surface and the horizontal reference surface is C; the angles A, B, and C are configured to satisfy the following constraints: ; ; .

[0011] Furthermore, the angle D between the diffuse reflector and the vertical reference plane satisfies the following relationship: .

[0012] Furthermore, the light guide is constructed using a light path tracing method. Along the propagation path of light within the light guide, invalid structural parts that do not participate in light guiding and have no optical function are identified and removed. The removal of these invalid structural parts does not change the propagation path or optical properties of the light.

[0013] Furthermore, the first patterned surface, the second patterned surface, and the third patterned surface are integrally formed on the optical surface of the light guide body, forming an integral structure with the light guide without any additional splicing, bonding, or assembly processes.

[0014] Furthermore, the diffuse reflector is a Lambertian reflector and / or an aluminized diffuse reflector; when the diffuse reflector includes an aluminized diffuse reflector, the reflectivity of its aluminized surface is not lower than a preset threshold.

[0015] Secondly, embodiments of the present invention provide a vehicle lamp, including a lamp housing, a lamp cover, and the aforementioned high-utilization, simple-structure automotive diffuse reflection vehicle lamp optical system, wherein the light guide and the diffuse reflector are installed inside the lamp housing, and the lamp cover covers the light emission direction.

[0016] The beneficial effects of this invention are: (1) Simplified structure, reduced costs and improved efficiency: This invention eliminates the light-diffusing plate in the prior art, reduces the number of core components, simplifies the installation steps of the car lights, and reduces assembly costs; at the same time, it eliminates the need to use aluminum plating process for the light guide, reduces production steps, effectively improves production efficiency, and reduces material and process costs.

[0017] (2) The light utilization rate is greatly improved: by utilizing the total internal reflection characteristics of light inside the light guide, the light utilization rate is 100% during the total internal reflection process, and there is no need for a light homogenizing plate to participate in the light homogenization, avoiding the energy loss caused by multiple aluminum plating reflections and light homogenizing plates. The optical utilization rate of the system is significantly improved, and the cost of electronic components can be reduced.

[0018] (3) Miniaturized size and strong adaptability: The lighting unit of the present invention has a simple structure. The light guide can be further reduced in size by cutting off the ineffective part, saving installation space. Moreover, the surface shape and angle of the patterned surface can be flexibly adjusted, and the installation position of the diffuse reflector can be adapted according to actual needs. The design has a high degree of freedom and can break through the space and shape limitations of automotive lamps, expanding from automotive interior lights to exterior lights, with a wider range of application scenarios.

[0019] (4) Excellent light uniformity: With uniform collimated light source as incident light, the light intensity distribution on the diffuse reflector can be adjusted as needed through the precise light control of the three patterned surfaces of the light guide, and the light uniformity is almost 100%, which meets the visual effect and regulatory requirements of automotive lights. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of a high-utilization, simple-structure automotive diffuse reflection headlight optical system provided in Embodiment 1 of the present invention.

[0022] Figure 2 This is a schematic diagram of a light guide with a stepped, sloping arc surface, provided in Embodiment 1 of the present invention.

[0023] Figure 3 This is a schematic diagram of the angle design reference and optical path propagation of a light guide provided in Embodiment 1 of the present invention.

[0024] Figure 4 This is a schematic diagram of a light guide component with a non-light-guiding, ineffective portion removed, provided in Embodiment 1 of the present invention.

[0025] Figure 5a This is a schematic diagram of the uniformity test of a vehicle lamp optical system using a common diffuse reflector provided in Embodiment 1 of the present invention.

[0026] Figure 5b This is a schematic diagram of the uniformity test of a vehicle lamp optical system using an aluminum-plated reflector provided in Embodiment 1 of the present invention. Detailed Implementation

[0027] Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but may also have additional steps not included in the figures. The process can correspond to a method, function, procedure, subroutine, subroutine, etc.

[0028] It should be understood that although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0030] Example 1 To facilitate understanding of the following embodiments, the overall inventive concept of the present invention is described here: The core of the inventive concept of the present invention is to eliminate the aluminum plating process of the light-diffusing plate and light guide that is relied upon in the prior art, and to achieve efficient light transmission by utilizing two total internal reflections and one refraction inside the light guide: the collimated light source provides a parallel beam of light, which enters without deflection through the light-incident surface of the light guide; the light undergoes total internal reflection (without energy loss) on the first and second patterned surfaces, and is refracted and emitted at the third patterned surface; the refracted light is incident on the diffuse reflection plate, and uniform light output is achieved through Lambertian reflection. At the same time, through angle adaptation design, the principal optical axis direction of the reflected light intensity distribution is set to a preset direction (such as the horizontal direction), which meets the light output requirements of different lamps. The light utilization rate of the total internal reflection process reaches 100%, avoiding the energy loss caused by multiple aluminum plating reflections and the light-diffusing plate; by adjusting the surface shape (planar / stepped inclined arc surface) and angle parameters of the patterned surface, uniform light intensity distribution on the diffuse reflection plate is achieved, and the light output uniformity is close to 100%. The patterned surface angle and overall size of the light guide can be flexibly adjusted according to the installation space. Ineffective structures are removed by optical path tracing to achieve miniaturization. The diffuse reflector can be made of Lambertian or aluminum-plated material, balancing brightness and uniformity, and is suitable for different scenarios such as automotive interior lights and exterior lights.

[0031] The specific implementation method is as follows: like Figure 1 The diagram shown is a schematic of a high-utilization, simple-structure automotive diffuse reflection lighting system provided by the present invention.

[0032] As an example, the optical system includes a collimating light source 1, a light guide 2, and a diffuser 3; the collimating light source 1 is used to generate a parallel light beam; the light guide 2 includes an incident surface, a first patterned surface 20, a second patterned surface 21, and a third patterned surface 22; the light guide 2 is configured such that a parallel light beam entering from the incident surface is sequentially incident on the first patterned surface 20, undergoes total internal reflection at the first patterned surface 20, the reflected light is incident on the second patterned surface 21, undergoes total internal reflection at the second patterned surface 21, and the reflected light is incident on the third patterned surface 22, undergoes total internal reflection at the third patterned surface 22, and then... The light guide 2 is refracted, and the refracted light from the light guide 2 is incident on the diffuse reflector 3, so that the principal axis direction of the light intensity distribution after the Lambertian reflection by the diffuse reflector 3 is a preset direction; and the constraint condition in the process of adapting the design of the structure of the light guide 2 is that the incident angle of the parallel beam on the first patterned surface 20 is greater than or equal to the critical angle of total internal reflection, the incident angle of the beam reflected by the first patterned surface 20 on the second patterned surface 21 is greater than or equal to the critical angle of total internal reflection, and the incident angle of the beam reflected by the second patterned surface 21 on the third patterned surface 22 is less than the critical angle of total internal reflection.

[0033] In some feasible implementations, the collimating light source 1 includes at least one light-emitting element (light-emitting diode) and a collimating optical component located in its light-emitting direction, wherein the collimating optical component is selected from Fresnel lens, freeform lens or total internal reflection lens.

[0034] In some feasible implementations, in order to make the principal optical axis direction of the light intensity distribution after the Lambertian reflection of the diffuse reflector 3 a preset direction, the structure of the light guide 2 and the installation / placement angle of the diffuse reflector 3 are adapted to the design, including the adapted design of the angle between the first patterned surface 20 and the horizontal reference surface, the angle between the second patterned surface 21 and the vertical reference surface, the angle between the third patterned surface 22 and the horizontal reference surface, and the angle between the diffuse reflector 3 and the vertical reference surface.

[0035] In some feasible implementations, combined with Figure 2 As shown, the first patterned surface 20, the second patterned surface 21, and the third patterned surface 22 are planar and / or stepped oblique arc surfaces; the stepped oblique arc surface structure is composed of multiple sequentially arranged sub-optical surfaces, each of which is an oblique arc surface with curvature. By adjusting the tilt angle and / or curvature of each of the sub-optical surfaces, the uniformity of the light spot shape and light intensity distribution incident on the diffuse reflector 3 is controlled.

[0036] Preferably, the deflection angle of a single beam of light is controlled by adjusting the tilt angle of the sub-optical surface, and the beam diffusion is achieved by adjusting the curvature of the sub-optical surface. The curvature of the sub-optical surface is positively correlated with the light scattering angle of the beam.

[0037] Preferably, the light intensity and light emission uniformity on the diffuse reflector 3 are determined by the curvature, size, and slope of the three patterned surfaces. By adjusting these three parameters, any desired light intensity distribution can be obtained on the diffuse reflector, which is fully compatible with the light emission requirements of different car lights.

[0038] Preferably, in a preferred embodiment of the present invention, at least one of the first patterned surface 20, the second patterned surface 21 and the third patterned surface 22 is not a simple plane, but adopts a stepped oblique arc surface structure.

[0039] Specifically, the stepped inclined arc surface is composed of multiple continuously arranged sub-optical surfaces 201 (taking the first patterned surface 20 as an example). Each sub-optical surface 201 is an inclined arc surface with a specific curvature. These sub-optical surfaces 201 together form a complete patterned surface on a macroscopic level, but on a microscopic level, each sub-surface independently modulates the incident light. Its working principle is as follows: When a relatively wide parallel beam of light is incident on the stepped inclined arc surface, the beam is physically divided into multiple sub-beams, each of which illuminates a sub-optical surface 201. By precisely designing the tilt angle (slope) of each sub-optical surface 201, the deflection direction of the corresponding sub-beam can be independently controlled; simultaneously, by designing the curvature (radian) of each sub-optical surface 201, the diffusion angle of the sub-beam can be controlled; the larger the radian, the more pronounced the diffusion. Finally, all the sub-beams modulated by their respective sub-optical surfaces are re-superimposed and merged in the far field (i.e., at the position of the diffuse reflector 3). By globally optimizing the slope and curvature parameters of all sub-optical surfaces, pixel-level precision control can be achieved over the shape of the final synthesized light spot, the uniformity of light intensity distribution, and the direction of the principal optical axis. This design replaces the diffuser plate in traditional technologies, completing light homogenization during the light guiding stage, thereby achieving extremely high light energy utilization.

[0040] The following is a specific design example to further illustrate this. Assume that the principal optical axis of the light field emitted from the diffuser 3 is expected to be horizontal. First, determine the material of the light guide (e.g., PC, refractive index n1 = 1.586) and the critical angle for total internal reflection (approximately 39.2°). Determine the preset position and angle D of the diffuser 3 based on the vehicle's shape. Then, employ a reverse optical path design method: starting from the desired uniform light spot on the diffuser 3, trace the light rays in the reverse direction to calculate the required beam set on the outgoing light surface (third patterned surface 22). To generate this beam set, the third patterned surface 22 is designed as a stepped, sloping arc surface. For example, the third patterned surface 22 is divided into 10 sub-optical surfaces along its length. For the 5th and 6th sub-surfaces in the middle, a smaller tilt angle and curvature can be designed so that the emitted light mainly contributes to the brightness of the light spot center. For the 1st and 2nd sub-surfaces and the 9th and 10th sub-surfaces on the sides, a larger tilt angle and a certain curvature are designed so that the emitted light is deflected to both sides and appropriately diffused to fill the edge of the light spot and ensure uniformity. The angle and curvature parameters of all sub-surfaces are determined through iterative optimization using optical simulation software (such as Zemax, Code V, and LightTools). Then, based on the optimized parameters of the third patterned surface 22, the parameters of the second patterned surface 21 and the first patterned surface 20 are derived in a forward direction. These surfaces can also adopt a stepped inclined arc surface structure, and the slope of their sub-optical surfaces can be finely adjusted to compensate for and correct the optical path, ensuring that the parallel light from the collimated light source 1 can accurately meet the direction requirements of the incident light for each sub-optical surface on the third patterned surface 22 after two total internal reflections. Through the above design, a target light field with uniform brightness, clear boundaries, and strictly horizontal principal optical axis can be obtained directly on the diffuse reflector plate 3 without relying on any external light-diffusing elements. The system's optical efficiency can approach the theoretical limit of total internal reflection.

[0041] In some feasible implementations, the refractive index of the light guide (2) is defined as n1, the refractive index of the surrounding medium is n2, and the critical angle for total internal reflection is... The angle between the first patterned surface (20) and the horizontal reference surface is A, the angle between the second patterned surface (21) and the vertical reference surface is B, and the angle between the third patterned surface (22) and the horizontal reference surface is C; the angles A, B, and C are configured to satisfy the following constraints: ; ; .

[0042] Preferably, the angle D between the diffuse reflector (3) and the vertical reference plane satisfies the following relationship: .

[0043] Specifically, in combination Figure 3As shown, only the simplified case of a single inclined plane without steps is considered. The refractive index of the light guide is defined as n1, and the refractive index of air as n2. Clockwise is defined as the positive direction of rotation, i.e., the rotation angle is positive, and counterclockwise is negative. Angle A is defined as the rotation angle of the first patterned surface relative to the horizontal reference plane, angle B as the rotation angle of the second patterned surface relative to the vertical reference plane, angle C as the rotation angle of the third patterned surface relative to the horizontal reference plane, and angle D as the rotation angle of the diffuse reflector 3 relative to the vertical reference plane. Figure 3 In the first light path, a parallel ray enters the light guide 2 and contacts the first patterned surface 20 to form total internal reflection. The incident angle and the total internal reflection angle are... The generated total internal reflection ray forms the second optical path; the second optical path is incident on the second patterned surface 21, and the incident angle and the total internal reflection angle are... The total internal reflection ray forms the third optical path; the third optical path is incident on the third patterned surface 22 at an angle of incidence of... The refracted ray forms the fourth optical path. According to the law of refraction, the angle of the fourth optical path can be calculated as follows: The fourth light path incident on diffuse reflector 3 produces Lambertian reflection. It is known that the direction of maximum intensity in Lambertian reflection is the center of the ray. To ensure that the direction of its strongest light is horizontal, i.e., the fifth light path, the scattered light produced by the fourth light path on diffuse reflector 3 is the fifth light path. Angle D should be half the angle between the fourth and fifth light paths. Among them, angles A and B should be wide enough to ensure that the incident light ray is greater than the angle of total internal reflection; angle C should ensure that the incident light ray is less than the angle of total internal reflection. Now, assuming the light guide material is PC with a refractive index n1 = 1.586 and the air refractive index n2 = 1, we can obtain... ; ; . Figure 3 In the simplified example, angle A is rotated 30° in the positive direction of the horizontal reference plane, i.e., A = 30°; angle B is parallel to the vertical reference plane, B = 0°; angle C is parallel to the horizontal reference plane, C = 0°. Substituting these parameters into the formula, the angle of the fourth light path is 52.46°. If the fifth light path is to be parallel, then the position angle D of the diffuse reflector 3 is... This embodiment features a high degree of design freedom and can be adapted to various surface shapes and diffuse reflector positions. Figure 3 This is only a simplified explanation for easy understanding. If a complex stepped surface is used, multiple calculations should be performed based on the inclination angle of each stepped surface.

[0044] In some feasible implementations, combined with Figure 4 As shown, the light guide 2 uses the optical path tracing method to identify and remove the ineffective structural parts of the light guide 2 that do not participate in light guiding and have no optical function along the propagation path of the light inside the light guide 2. The removal of the ineffective structural parts does not change the propagation path and optical characteristics of the light.

[0045] Preferably, the first patterned surface 20, the second patterned surface 21, and the third patterned surface 22 are integrally formed on the optical surfaces of the light guide 2 body, forming an integral structure with the light guide 2 without additional splicing, bonding, or assembly processes.

[0046] In some feasible embodiments, the diffuse reflector 3 is a Lambertian reflector and / or an aluminized diffuse reflector; when the diffuse reflector 3 includes an aluminized diffuse reflector, the reflectivity of its aluminized surface is not lower than a preset threshold. Specifically, in a preferred embodiment of the present invention, the diffuse reflector 3 is a Lambertian reflector. This plate uses polymethyl methacrylate as a substrate and is injection molded using a precision mold, forming a random microprism structure with an average height of 10-50 micrometers on its light-emitting surface. This microstructure allows incident light to be sufficiently scattered on its surface, thereby obtaining reflective characteristics close to an ideal Lambertian reflector, with a surface reflectivity of over 92%. This embodiment provides soft and uniform light without specular glare, suitable for interior ambient lighting or daytime running lights where visual comfort is paramount. In another preferred embodiment of the present invention, the diffuse reflector 3 is an aluminized diffuse reflector. This plate uses engineering plastics (such as polycarbonate) as a substrate, first matte-treating its surface to create a certain roughness, and then depositing an aluminum film on it using a vacuum evaporation process. Its aluminum-plated surface has a reflectivity of not less than 85% (i.e., a specific example of the "preset threshold"). This implementation method ensures high light efficiency while exhibiting excellent weather resistance and structural strength, making it particularly suitable for applications in harsh environments where exterior vehicle lighting requires high brightness.

[0047] It is understood that the diffuse reflector 3 is not limited to the two specific forms described above. For example, a metal or plastic plate coated with a high-reflectivity diffuse white paint (such as a coating containing barium sulfate or titanium dioxide particles) can also be used as a Lambertian reflector. For aluminized diffuse reflectors, the "preset threshold" can be specifically set according to different optical efficiency targets and cost considerations, such as 80%, 88%, or 90%, as long as its reflectivity is sufficient to ensure that the overall light effect of the system meets the design expectations. All structures or materials that can achieve the required Lambertian reflection characteristics and meet the corresponding reflectivity requirements fall within the protection scope of this embodiment.

[0048] In some feasible implementations, combined with Figures 5a-5b As shown, the upper area is a rectangular test area marked with points (1-7), corresponding to the effective light-emitting range of the reflector in the vehicle lighting system; the lower curve: the horizontal axis represents the test length (unit: mm), and the vertical axis represents the brightness value, reflecting the brightness distribution at different positions of the reflector. Figure 3The system was designed with a uniform collimated light source of 10 lumens and a luminous flux of 5mm × 5mm. The resulting brightness was 28,000 cd / m² on the Lambertian reflector and 4,000,000 cd / m² on the 85% aluminized reflector. This significantly improved the system's optical utilization and achieved a uniformity of 90%. Furthermore, the brightness curves for both reflectors remained stable with minimal fluctuations, indicating excellent light uniformity in this diffuse reflection headlight system. The brightness difference was also significant: the 85% aluminized reflector exhibited a significantly higher brightness than the ordinary diffuse reflector, highlighting the advantage of aluminized materials in terms of reflection efficiency.

[0049] Example 2 This embodiment provides a vehicle lamp, including a lamp housing, a lamp cover, and a high-utilization, simple-structure automotive diffuse reflection lamp optical system as described in Embodiment 1. The light guide 2 and the diffuse reflector 3 are installed inside the lamp housing, and the lamp cover covers the light emission direction.

[0050] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A high-utilization, simple-structure automotive diffuse reflection lighting system, characterized in that, The optical system includes a collimating light source (1), a light guide (2), and a diffuse reflector (3); The collimated light source (1) is used to generate a parallel beam of light; The light guide (2) includes an incident surface, a first patterned surface (20), a second patterned surface (21), and a third patterned surface (22). The light guide (2) is configured such that a parallel light beam entering from the incident surface is sequentially incident on the first patterned surface (20), undergoes total internal reflection at the first patterned surface (20), and the reflected light is incident on the second patterned surface (21), undergoes total internal reflection at the second patterned surface (21), and the reflected light is incident on the third patterned surface (22), refracted out of the light guide (2) at the third patterned surface (22), and the refracted light from the light guide (2) is incident on the diffuse reflector (3), so that the principal optical axis direction of the light intensity distribution after the Lambert reflection by the diffuse reflector (3) is a preset direction. Furthermore, the constraint conditions in the process of adapting the design of the light guide (2) structure are that the incident angle of the parallel beam on the first patterned surface (20) is greater than or equal to the critical angle of total internal reflection, the incident angle of the beam reflected by the first patterned surface (20) on the second patterned surface (21) is greater than or equal to the critical angle of total internal reflection, and the incident angle of the beam reflected by the second patterned surface (21) on the third patterned surface (22) is less than the critical angle of total internal reflection.

2. The high-utilization, simple-structure automotive diffuse reflection lighting system according to claim 1, characterized in that, The collimated light source (1) includes at least one light-emitting element and a collimating optical component located in its light-emitting direction. The collimating optical component is selected from Fresnel lenses, freeform lenses or total internal reflection lenses.

3. The high-utilization, simple-structure automotive diffuse reflection lighting system according to claim 1, characterized in that, In order to make the main optical axis direction of the light intensity distribution after the Lambertian reflection of the diffuse reflector (3) a preset direction, the structure of the light guide (2) and the installation / placement angle of the diffuse reflector (3) are adapted to be designed, including the angle between the first patterned surface (20) and the horizontal reference surface, the angle between the second patterned surface (21) and the vertical reference surface, the angle between the third patterned surface (22) and the horizontal reference surface, and the angle between the diffuse reflector (3) and the vertical reference surface.

4. The high-utilization, simple-structure automotive diffuse reflection lighting system according to claim 1, characterized in that, The first patterned surface (20), the second patterned surface (21) and the third patterned surface (22) are planar and / or stepped oblique arc surfaces; the stepped oblique arc surface structure is composed of multiple sub-optical surfaces arranged in sequence, and the sub-optical surfaces are oblique arc surfaces with curvature. By adjusting the tilt angle and / or curvature of each sub-optical surface, the uniformity of the light spot shape and light intensity distribution incident on the diffuse reflector (3) is controlled. The deflection angle of a single beam of light is controlled by adjusting the tilt angle of the sub-optical surface, and the beam diffusion is achieved by adjusting the curvature of the sub-optical surface. The curvature of the sub-optical surface is positively correlated with the light scattering angle of the beam.

5. The high-utilization, simple-structure automotive diffuse reflection lighting system according to claim 1, characterized in that, The refractive index of the light guide (2) is defined as n1, the refractive index of the surrounding medium is n2, and the critical angle for total internal reflection is... The angle between the first patterned surface (20) and the horizontal reference surface is A, the angle between the second patterned surface (21) and the vertical reference surface is B, and the angle between the third patterned surface (22) and the horizontal reference surface is C; the angles A, B, and C are configured to satisfy the following constraints: ； ； 。 6. The high-utilization, simple-structure automotive diffuse reflection lighting system according to claim 5, characterized in that, The angle D between the diffuse reflector (3) and the vertical reference plane satisfies the following relationship: 。 7. The high-utilization, simple-structure automotive diffuse reflection lighting system according to claim 1, characterized in that, The light guide (2) adopts the optical path tracing method to identify and cut off the ineffective structural parts in the light guide (2) that do not participate in light guiding and have no optical function along the propagation path of light inside the light guide (2). After the ineffective structural parts are cut off, the propagation path and optical characteristics of light are not changed.

8. The high-utilization, simple-structure automotive diffuse reflection lighting system according to claim 7, characterized in that, The first patterned surface (20), the second patterned surface (21), and the third patterned surface (22) are integrally formed on the optical surface of the light guide (2) body, and are integral with the light guide (2) structure without additional splicing, bonding or assembly processes.

9. The high-utilization, simple-structure automotive diffuse reflection lighting system according to claim 1, characterized in that, The diffuse reflector (3) is a Lambert reflector and / or an aluminum-plated diffuse reflector; when the diffuse reflector (3) includes an aluminum-plated diffuse reflector, the reflectivity of its aluminum-plated surface is not lower than a preset threshold.

10. A vehicle light, characterized in that, The system includes a lamp housing, a lamp shade, and a high-utilization, simple-structure automotive diffuser lighting system as described in any one of claims 1 to 9, wherein the light guide (2) and the diffuser (3) are installed inside the lamp housing, and the lamp shade covers the light-emitting direction.

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