Lighting device and vehicle

Abstract

The utility model provides a lighting device and a vehicle. The lighting device comprises: at least one light source for emitting at least one lighting light; the fly's-eye lens is located on an emergent light path of the at least one light source, and the fly's-eye lens comprises a micro-lens array area formed by a plurality of convex micro-lenses and a peripheral area surrounding the micro-lens array area; the light spot coverage area of the illumination light covers the micro-lens array area to form light rays distributed on a first surface at the color wheel, the illumination uniformity of the light rays distributed on the first surface is greater than a first threshold value, and the light rays distributed on the first surface are emitted through the lens to form a first light beam; light rays distributed on a second surface are formed at the color wheel after the light spot coverage area of the illumination light covers the micro-lens array area and the peripheral area, the ratio of the illuminance of the center position of the light rays distributed on the second surface to the illuminance of the peripheral position is larger than a second threshold value, and the light rays distributed on the second surface penetrate through the lens to be emitted to form a second light beam.

Description

Technical Field

[0001] This application relates to the field of lighting technology, and more particularly to a lighting device and a vehicle. Background Technology

[0002] As the eyes of a car, headlights provide low beam, high beam, and adaptive driving beam functions. Projection headlights are gradually becoming a development trend in automotive headlights. When projecting images / videos, uniform light intensity is required across the entire image. For high beam illumination, a high center intensity is needed to help drivers gain a clear view of distant objects and improve safety at high speeds. Current projection headlights suffer from insufficient center intensity for high beam illumination and poor beam uniformity for projection display illumination. Utility Model Content

[0003] This application provides a lighting device and a vehicle for switching between high beam mode and projection mode using the same light source and optomechanical system, thereby meeting the functional requirements of high beam lighting and projection. The various aspects covered in this application are described below.

[0004] In a first aspect, this application provides an illumination device, comprising: at least one light source for emitting at least one illumination light; a compound eye lens located in the light path of the at least one light source, the compound eye lens comprising a microlens array region composed of a plurality of convex microlenses and a peripheral region surrounding the microlens array region; the illumination light spot covering the microlens array region of the compound eye lens forms a first surface-distributed light ray, the illuminance uniformity of the first surface-distributed light ray is greater than a first threshold, and the first surface-distributed light ray is emitted through the lens to form a first beam; the illumination light spot covering the microlens array region and the peripheral region forms a second surface-distributed light ray, the ratio of the illuminance at the center position to the illuminance at the peripheral position of the second surface-distributed light ray is greater than a second threshold, and the second surface-distributed light ray is emitted through the lens to form a second beam.

[0005] Secondly, this application provides a vehicle, including a vehicle body and a lighting device as described in the first aspect, the lighting device being disposed on the vehicle body.

[0006] In the optical path of the lighting device of this application embodiment, a compound eye lens is provided. The central region of the compound eye lens is a microlens array region composed of multiple convex microlenses, and the peripheral region of the compound eye lens is a non-convex microlens array region. By using a compound eye lens with a non-complete microarray to modulate the optical devices in the optical path, two operating modes can be achieved. In the first operating mode, the illumination light only passes through the central region to form a first-surface distribution of light, which can meet the uniform light pattern distribution required for projection display lighting. In the second operating mode, the illumination light passes through both the central region and the peripheral region to form a second-surface distribution of light, which can meet the requirement of strong central brightness and weak peripheral light pattern distribution for high beam lighting. This application embodiment helps to balance the strong central brightness light pattern distribution required for high beam lighting and the uniform light pattern distribution required for projection display lighting. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below.

[0008] Figure 1 This is a schematic diagram of a vehicle headlight projection display.

[0009] Figure 2 This is a schematic diagram of the high beam illumination of a vehicle's headlights.

[0010] Figure 3 This is a diagram illustrating the coverage angle requirements for high beam lighting under relevant traffic regulations.

[0011] Figure 4 This is a schematic diagram of the optical path of a vehicle lighting device provided by related technologies.

[0012] Figure 5 yes Figure 4 A schematic diagram showing the coverage angle of the high beam illumination of the lighting device shown.

[0013] Figure 6 This is a schematic diagram of the lighting device provided in the embodiments of this application.

[0014] Figure 7 yes Figure 6 The diagram shows the angular distribution behind the compound eye lens of the lighting device in high beam mode.

[0015] Figure 8 yes Figure 6 The diagram shows the distribution of the light spot at the color wheel of the lighting device under high beam function.

[0016] Figure 9 yes Figure 6 The diagram shows the angular distribution of the lighting device behind the compound eye lens under projection function.

[0017] Figure 10 yes Figure 6 The diagram shows the distribution of light spots on the color wheel of the lighting device under projection function.

[0018] Figures 11a-11b yes Figure 6 A schematic diagram of one possible implementation of the lighting device shown.

[0019] Figure 12 yes Figure 6 A schematic diagram of another possible implementation of the lighting device shown.

[0020] Figure 13 yes Figure 6 A schematic diagram of another possible implementation of the lighting device shown.

[0021] Figure 14 This is a schematic diagram of the constituent units / partial constituent units of the vehicle provided in the embodiments of this application. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The same or similar reference numerals are used in the drawings to represent the same or similar modules. It should be understood that the drawings are merely illustrative, and the scope of protection of this application is not limited thereto.

[0023] Car headlights, also known as automotive headlights, act as the eyes of a vehicle, illuminating the road ahead and providing the driver with a wide and bright field of vision to prevent traffic accidents. Headlights can provide both low beam and high beam illumination.

[0024] Projection headlights are gradually becoming a development trend in automotive headlights, and the requirements for functional integration are gradually increasing. For example... Figure 1 As shown, when projecting images / videos, it is required that the light intensity be as uniform as possible throughout the screen to meet people's needs for projected display image quality. For example... Figure 2 As shown, high beam illumination requires a very high intensity at the center of the beam to help the driver gain a clear view of distant objects and improve safety at high speeds. The beam intensity distribution required for these two functions differs significantly.

[0025] Relevant traffic regulations require the following specifications regarding the coverage angle and intensity distribution of high beam lighting: Figure 3 As shown in Table 1, its lighting range should cover at least ±12° in the horizontal direction and 0–2° in the vertical direction, and the intensity distribution should be strong in the center (i.e., strong in the center). Figure 3 The HV point (the front of the vehicle) has the characteristics of weak edges.

[0026] Projection displays also have standard requirements for the uniformity of brightness in the projected image. For example, GY / T 205-2011, "Technical Requirements and Measurement Methods for Projectors for Digital Cinema Mobile Projection Systems," specifies the uniformity of light output, meaning the consistency of white light illuminance at all positions on the screen when the projector outputs white light, requiring a uniformity of no less than 70% or 60%. T / CVIA-77-2020, "Laser Television Image Quality Evaluation Specification," also specifies brightness uniformity, with a score highest when it exceeds 75%. Therefore, for projection display functions, the requirements for illuminance / brightness uniformity in image quality are high, meaning the intensity distribution of the projector lamps must be uniform.

[0027] Table 1

[0028]

[0029] Automotive exterior design often requires that the size and dimensions of the headlight module cannot be increased. The beam intensity distribution required for high beam illumination and projection functions are significantly different, making it difficult to integrate the two into a single optical system.

[0030] Related technologies have proposed a solution for a projection headlight. For example... Figure 4 As shown, the optical path of this projection lamp uses a light-emitting diode (LED) light source, which is projected onto a digital micromirror device (DMD) through two collecting lenses and a freeform surface mirror, and then exits through a lens. Figure 5 As shown, this projection lamp can cover a range of ±7° horizontally and ±3.5° vertically. This solution creates a strong, non-uniform illumination at the center on the DMD, but it suffers from insufficient center intensity when used for high-beam illumination and poor beam intensity uniformity when used for projection display illumination.

[0031] It should be noted that the problem mentioned above, in which the projection headlight cannot simultaneously achieve strong center intensity during high beam illumination and uniform beam intensity during projection display, is only an example. The embodiments of this application can be applied to any type of scenario in which the lighting device cannot simultaneously achieve strong center intensity during high beam illumination and uniform intensity during projection display illumination.

[0032] Therefore, it is necessary to design a technical solution that balances strong center brightness during high-beam illumination with uniform brightness during projection display illumination.

[0033] Based on this, this application proposes a lighting device. The following is in conjunction with... Figure 6 The lighting device according to the embodiments of this application will be described in detail. For example... Figure 6 As shown, the lighting device 600 in this application embodiment may include at least one light source 610 and a compound eye lens 630.

[0034] The light source 610 is used to emit at least one illumination light.

[0035] In some embodiments, the light source 610 can be one or more of a light-emitting diode (LED), a laser diode (LD), and a laser. In other embodiments, the light source 610 can be a combination of one or more of a light-emitting diode, a laser diode, or a laser with a wavelength conversion device, which can specifically be a rotatable fluorescent color wheel or a fixed fluorescent device. Thus, the illumination light can be excitation light, a combined beam of the laser light and the excitation light, or only the laser light. For ease of explanation, this application embodiment uses a fluorescent color wheel as an example of the wavelength conversion device.

[0036] When the illumination light is only the excitation light, the light source 610 can be a blue LED and / or a blue LD. After the blue light is incident on the compound eye lens 630, a light spot with a predetermined light distribution is obtained, which enters the subsequent optical path for illumination or to excite a wavelength conversion device to obtain illumination light of the target color. When the illumination light is a combined beam of laser light and excitation light, or only laser light, the light source 610 is, for example, a combination of a blue LED and / or a blue LD and a fluorescent color wheel. Short-wavelength blue light is used as excitation light and is incident on the fluorescent color wheel. The color wheel receives the excitation light and emits long-wavelength laser light such as red, green, and / or yellow light. When the illumination light needs to be white light, yellow light is combined with blue light that has not been completely absorbed to obtain white light. After the white light is incident on the compound eye lens 630, a light spot with a predetermined light distribution is obtained, which enters the subsequent optical path.

[0037] For example, the light source 610 can be a laser diode. An LD chip is a semiconductor device driven by current. When the operating current reaches a threshold current, it can emit laser light of a set wavelength. The laser light can be blue light, violet light, or ultraviolet light, etc.

[0038] The compound eye lens 630 is located in the outgoing light path of the light source 610. The compound eye lens 630 may include a microlens array region and a peripheral region 632 surrounding the microlens array region. The microlens array region is a microlens array composed of multiple convex microlenses, typically located at the center. The peripheral region 632 is located around the center and is different from a microlens array structure composed of convex microlenses; it may also be referred to as a non-convex lens array region or a non-microconvex lens array region. For ease of explanation, in this embodiment, the microlens array region is collectively referred to as the central region 631. Therefore, the compound eye lens 630 may also be referred to as a non-complete microarray compound eye.

[0039] A compound eye is composed of numerous ommatidia. The microlens array region of a compound eye lens can achieve high light energy utilization and large-area uniform illumination in an illumination system. When the illumination light only covers the central region 631 of the microlens array, uniform light distribution can be achieved, resulting in a uniform surface distribution behind the compound eye lens 630.

[0040] Convex microlenses have the function of converging light. Unlike convex microlenses, in some embodiments, the peripheral region 632 of the compound eye lens 630 can be a region composed of a planar lens. In other embodiments, the peripheral region 632 can also be a region composed of frosted glass with a scattering effect. In still other embodiments, the peripheral region 632 of the compound eye lens 630 can be a region composed of a diverging lens (such as a concave lens), which helps to increase the light-scattering ability of the peripheral region 632 and increase the difference between the light intensity transmitted through the central region 631 and the light intensity of the peripheral region 632.

[0041] In some implementations, the lighting device 600 may also include a lens 690. The lens 690 is used to generate an image. For example, the lens 690 projects light onto a screen to generate an image.

[0042] The lighting device 600 can have two operating modes. In the first operating mode, the light spot emitted by the light source 610 covers only the central region 631 of the compound eye lens 630, forming a first surface-distributed light beam. In other words, the light beam passes through the central region 631 of the compound eye lens 630 without passing through the peripheral region 632, forming the first surface-distributed light beam. The illuminance uniformity of the first surface-distributed light beam is greater than a first threshold, and the light beam exits through the lens 690 to form a first beam. The first beam has good uniformity. The first threshold is less than 1, for example, it can be 60%, 70%, 75%, etc., and can be set according to relevant requirements. In the second operating mode, the light spot simultaneously covers both the central region 631 and the peripheral region 632 of the compound eye lens 630, forming a second surface-distributed light beam. In other words, the light beam passes through both the central region 631 and the peripheral region 632 of the compound eye lens 630, forming the second surface-distributed light beam. The ratio of the illuminance at the center position to the illuminance at the peripheral position of the second surface-distributed light beam is greater than a second threshold, and the light beam exits through the lens 690 to form a second beam. The first beam is characterized by a strong center and a weak periphery. The second threshold is greater than 1, for example, it can be 1.5, 2, 2.5, etc., and can be set according to the relevant regulations and requirements of the high beam function.

[0043] In this embodiment, the central region 631 of the compound eye lens 630 is a microlens array region composed of multiple convex microlenses, and the peripheral region 632 of the compound eye lens 630 is a non-convex microlens region. By using a non-complete microarray compound eye lens 630 to modulate the optical devices in the optical path, two operating modes can be achieved. In the first operating mode, the illumination light only passes through the central region 631 to form a first-surface distribution of light, which can meet the uniform light pattern distribution required for projection display illumination. In the second operating mode, the illumination light passes through both the central region 631 and the peripheral region 632 to form a second-surface distribution of light, which can meet the requirement of a strong central brightness and a weak peripheral light pattern distribution for high-beam illumination. Therefore, this embodiment helps to balance the strong central brightness light pattern distribution required for high-beam illumination and the uniform light pattern distribution required for projection display illumination.

[0044] In this embodiment, the different beam intensities required by the lighting device 600 under different operating modes can be achieved by using multiple optical devices in the optical path.

[0045] In some implementations, the optical path of the illumination device 600 may further include: a focusing lens 640, a color wheel 650, a collecting lens 660, a total internal reflection prism 670, and a digital micromirror element 680. A compensating prism may also be provided at the total internal reflection (TIR) ​​prism 670.

[0046] High-beam lighting requires high light intensity and is usually white light. White light is a broadband light, and in fields such as lighting and projection, it is difficult to obtain white light that meets the requirements for high brightness through bulbs and semiconductors.

[0047] In some embodiments, the color wheel 650 is located in the outgoing light path of the compound eye lens 630 to convert the illumination light into target light, for example, white light or other light of a desired color. The illumination light is excitation light having a first wavelength range, used to excite the color wheel 650 to generate laser light with at least a second wavelength range. The excitation light is light from which an external energy input excites a substance (such as an atom, molecule, or material) to transition from its ground state to an excited state. The laser light is ordered light generated by stimulated emission processes within the substance. Understandably, the first wavelength range differs from the second wavelength range.

[0048] The color wheel 650 is a wavelength conversion mechanism. When excited by excitation light, the wavelength conversion mechanism performs wavelength conversion and generates laser light. The converted excitation light and the unconverted excitation light are combined to produce white light (i.e., emitted light).

[0049] For example, the excitation light can be a blue laser. When the blue laser is irradiated onto a high-speed rotating fluorescent color wheel 650, wavelength conversion occurs, producing a yellow-green received laser. The yellow-green received laser and the unconverted blue excitation light are combined to produce a broadband white light, which is then projected as a spot through a lens. In other words, a broadband white light is emitted to achieve the effect of illumination.

[0050] In other embodiments, the color wheel 650 may also be located in the incident light path of the compound eye lens 630, i.e., in front of the compound eye lens 630. In this case, the illumination light is the combined beam of the excitation light and the laser beam.

[0051] The digital micromirror device 680 is used for direction and area adjustment of the light beam. A digital micromirror device (DMD) is a surface light modulator in a space light modulator (SLM). A surface light modulator includes an array of micromirror actuators. The angle of each micromirror can be adjusted individually, and the number of mirrors corresponds to the resolution of the projected image; each mirror can display one or more pixels. The digital micromirror device is used to achieve imaging in the optical path, enabling the lighting device to project different patterns onto the road ahead of the vehicle. This helps to reduce the size of vehicle lights, enabling smaller, multi-functional vehicle lighting devices.

[0052] In some implementations, different surface distributions corresponding to different operating modes of light can be formed at the color wheel 650. In the first operating mode, the illumination light spot covers the microlens array area of ​​the compound eye lens 630 and is transmitted to the color wheel 650 to form the first surface distribution of light; or, the illumination light passes through the central region 631 of the compound eye lens 630 and is transmitted to the color wheel 650 to form the first surface distribution of light. The illuminance uniformity of the first surface distribution of light is greater than a first threshold, and the light from the first surface distribution is emitted through the lens 690 to form a first beam. In the second operating mode, the illumination light spot covers the microlens array area and the peripheral area of ​​the compound eye lens 630 and is transmitted to the color wheel 650 to form the second surface distribution of light; or, the illumination light passes through the central region 631 and the peripheral region 632 and is transmitted to the color wheel 650 to form the second surface distribution of light. The ratio of the illuminance at the center position to the illuminance at the peripheral position of the second surface distribution of light is greater than a second threshold, and the light from the second surface distribution is emitted through the lens 690 to form a second beam. Since the final output is white light, the color wheel 650 can convert the illumination light into white light. Typically, the optical path extension loss is minimized when the desired surface distribution is formed at the color wheel 650. Forming the surface distribution required for different light modes at the color wheel 650 position helps reduce the loss of optical path extension.

[0053] Figure 7 yes Figure 6The diagram shows an angular distribution of the lighting device behind the compound eye lens in high beam mode. (See diagram for example.) Figure 7 As shown, in the second operating mode, the angular distribution of the light spot behind the compound eye lens 630 shows that the light radiation intensity at the center (horizontal ±0.5°, vertical ±0.5°) is approximately 6000 W / Sr, while the light radiation intensity at the peripheral position is approximately 3800 W / Sr. The peripheral position is... Figure 7 The green area is the rectangular region with a horizontal angle of -3.5° to 3.5° and a vertical angle of -1.5° to 1.5°, excluding the center. Radiant intensity is a physical quantity describing the radiation characteristics of a point radiation source; it refers to the radiant flux per unit solid angle in a certain direction.

[0054] Figure 8 yes Figure 6 This diagram illustrates the distribution of the light spot at the color wheel of the lighting device in high beam mode. Figure 8 As shown, in the second operating mode, the irradiance (E) at the center position (X±0.2mm, Y±0.2mm) of the light distributed on the second surface of the color wheel is approximately 30 watts per square millimeter (W / mm²). 2 The irradiance in the surrounding area is approximately 18 W / mm². 2 The ratio of irradiance at the center location to that at the periphery location is greater than the second threshold. Wherein, the periphery location is... Figure 8 The green area in the image. Irradiance, or simply irradiance, is the amount of radiation projected onto a unit receiving area.

[0055] Figure 9 yes Figure 6 The diagram shows the angular distribution of the lighting device behind the compound eye lens in projection mode. (See diagram for reference.) Figure 9 As shown, in the first working mode, the angular distribution of the light spot behind the compound eye lens 630 is relatively uniform, and the light radiation intensity within the coverage area (red rectangular area) is about 3000W / Sr. Figure 10 yes Figure 6 The diagram shows the light spot distribution at the color wheel of the lighting device under projection function. (See diagram for example.) Figure 10 As shown, in the first working mode, the irradiance of the light distributed on the first surface of the color wheel (red rectangular area) is relatively uniform, approximately 16 W / mm². 2 .

[0056] In this embodiment, the light spot of the light source in front of the compound eye lens 630 is modulated to form the angular distribution required for the two working modes behind the compound eye lens, thereby forming the central strong light spot required for the high beam function and the uniform light spot required for the projection function at the color wheel. The fluorescence excited by the color wheel 650 passes through the collecting lens 660 and enters the total internal reflection prism 670 to the digital micromirror element 680, forming the required central strong light spot and uniform light spot on the digital micromirror element 680, respectively. Further, through imaging by the lens 690, a beam with adjustable intensity distribution is finally formed, namely, a uniformly distributed first beam or a second beam with a strong center and weak periphery.

[0057] The lighting device of this application embodiment will be further described below with reference to some possible implementations of the embodiments of this application.

[0058] In some implementations, the illumination device 600 may further include a first lens 620. The first lens 620 is located between at least one light source 610 and the compound eye lens 630. The first lens 620 is used to adjust the light spot coverage area of ​​the illumination light entering the compound eye lens 630. The light spot coverage area is either a microlens array area or a microlens array area plus a surrounding area.

[0059] Typically, the collimation of the light emitted by the light source 610 is poor. For example, the first lens 620 can be a collimating lens to shape and collimate the light beam so that all the illumination light emitted by the light source 610 passes through the compound eye lens 630. The collimating lens has a first state and a second state, which correspond to the first and second operating modes of the illumination device 600, respectively. When the first lens 620 is in the first state, the illumination light passes through the central region 631 of the compound eye lens 630 but not through the peripheral region 632, thereby forming a uniform light spot required for the projection function. When the first lens 620 is in the second state, the illumination light passes through both the central region 631 and the peripheral region 632 of the compound eye lens 630, thereby forming a light spot with a strong center and weak periphery required for the high beam function. By switching between the two states of the first lens 620, the first and second operating modes can be switched.

[0060] In some implementations, the first lens 620 is a collimating lens, and its focal length is adjustable. When the focal length of the first lens 620 is the first focal length, the area covered by the illumination light entering the compound eye lens 630 is the microlens array area. The first lens 620 is in a first state, corresponding to a first operating mode. When the focal length of the first lens 620 is the second focal length, the area covered by the illumination light entering the compound eye lens 630 is the microlens array area and its surrounding area. The first lens 620 is in a second state, corresponding to a second operating mode. The first focal length and the second focal length are not the same; typically, the first focal length is smaller than the second focal length.

[0061] In some implementations, the first lens 620 is a collimating lens. When the distance between the collimating lens and at least one light source 610 is a first distance, the area covered by the illumination light entering the compound eye lens 630 is the microlens array area. When the distance between the collimating lens and at least one light source 610 is a second distance, the area covered by the illumination light entering the compound eye lens 630 is the microlens array area and its surrounding area, where the first distance is less than the second distance. That is, by changing the distance, the two states of the first lens 620 are switched, achieving the switching between a first operating mode and a second operating mode.

[0062] In some specific implementations, the position of at least one light source 610 can be moved relative to the first lens 620.

[0063] Typically, the light source 610 is connected to the heat dissipation system, making the design of the moving structure relatively complex. In some other specific implementations, the position of the first lens 620 can be moved relative to at least one light source 610; in other words, the position of the first lens 620 is adjustable. When the distance between the first lens 620 and at least one light source 610 is a first distance, the first lens 620 is in a first state. Figures 11a-11b yes Figure 6 The diagram illustrates one possible implementation of the lighting device. Other optical elements following the color wheel 650 are omitted from the diagram; these other optical elements can be connected to… Figure 6 The arrangement may be consistent or inconsistent. For example... Figure 11a As shown, the first lens 620 allows illumination light to pass through the central region 631 of the compound eye lens 630 without passing through the peripheral region 632, corresponding to the first operating mode, thereby forming the uniform light spot required for the projection function. When the distance between the first lens 620 and at least one light source 610 is a second distance, the first lens 620 is in a second state. The first distance and the second distance are not the same; typically, the first distance is smaller than the second distance. Figure 11b As shown, the first lens 620 allows illumination light to pass through the central region 631 and the peripheral region 632 of the compound eye lens 630, corresponding to the second working mode, thereby forming a light spot with a strong center and weak periphery required for the high beam function. By adjusting the front and rear position of the first lens 620 in the optical path, the first working mode and the second working mode can be switched. This adjustment method is simple and reliable.

[0064] Taking the 610 light source as an example of a laser, Figure 11a , Figure 11bThe main working process of the lighting device 600 is as follows: The light source 610 emits illumination light, which reaches the first lens 620. The position of the first lens 620 is adjusted so that the distance between it and the light source 610 is a first distance, so that the light spot emitted by the first lens 620 only covers the microlens array in the central region 631 of the compound eye lens 630 for uniform light distribution, resulting in a uniform surface distribution after the compound eye lens 630, i.e., it is in the first working mode. After passing through the focusing lens 640, the light reaches the color wheel 650, forming a uniform light spot at the color wheel position. After being collected by the lens 660, the total internal reflection prism 670, the compensating prism, and the digital micromirror element 680, the light is emitted through the lens 690 to form a uniformly distributed first beam, which can realize the projection display function with uniform light intensity. Furthermore, the distance between the first lens 620 and the light source 610 is adjusted to a second distance, so that the light spot coverage area in front of the compound eye lens 630 is the central area 631 and the peripheral area 632 (i.e., the microlens array area and the non-micro-convex lens array area) of the compound eye lens 630, which is the second working mode. The light spot forms a distribution with strong intensity in the center and weak intensity at the periphery at the color wheel 650 position. After being collected by the lens 660, the total internal reflection prism 670, the compensation prism, and the digital micromirror element 680, it is emitted through the lens 690 to form a non-uniformly distributed second beam, thus realizing the high beam illumination function. Through the adjustment of the digital micromirror element 680 and other components, the second beam can meet the requirements of relevant traffic regulations for high beam illumination, such as the illumination range covering ±12° in the horizontal direction and 0~2° in the vertical direction, with the intensity distribution showing the characteristics of strong intensity in the center and weak intensity at the edges.

[0065] In some implementations, the focal length of the first lens 620 is based on refractive index adjustment. The refractive index of the first lens 620 can be adjusted based on one or more of the following methods: optical, electrical, thermal, mechanical, or chemical.

[0066] Specifically, such as Figure 12 As shown, the first lens 620 is a lens with an adjustable refractive index. Figure 12 Implementation examples and Figure 11aThe main difference in the embodiments lies in the performance of the first lens 620. The first lens 620 is an optically adjustable lens, and the lens material can be one or more of liquid crystal, semiconductor, polymer, metamaterial, etc. The refractive index of the first lens 620 is adjusted by applying external stimuli such as light, electricity, heat, force, or chemicals to both ends of the first lens 620. For example, applying an electrical signal to both ends of the first lens 620 adjusts its refractive index to a first refractive index, the focal length at the first refractive index is the first focal length, and the first lens 620 is in a first state, corresponding to a first operating mode. Turning off the electrical signal restores its refractive index to a second refractive index, the focal length at the second refractive index is the second focal length, and the first lens 620 is in a second state, corresponding to a second operating mode. Generally, the refractive index is inversely proportional to the focal length, and the first refractive index is greater than the second refractive index.

[0067] Adjusting the refractive index is essentially adjusting the focal length, so that the area of ​​light coverage in front of the compound eye lens 630 varies in different operating modes. For example... Figure 12 As shown, in the first working mode, corresponding to the projection display function, the light distribution in front of the compound eye lens 630 is as shown by the dashed line, covering only the central area 631 of the compound eye lens 630. In the second working mode, corresponding to the high beam function, the light distribution in front of the compound eye lens 630 is as shown by the solid line, covering the central area 631 and the peripheral area 632 of the compound eye lens 630.

[0068] The above embodiments achieve the switching between the first operating mode and the first operating mode by adjusting the position or refractive index of the first lens 620. In other implementations, the switching between the first operating mode and the first operating mode can be achieved by controlling the on / off state of some of the light sources 610.

[0069] Specifically, the aforementioned at least one light source 610 can be multiple light sources, which may include a first light source and a second light source located around the first light source. The first light source is a portion of the multiple light sources located in the middle position, and the second light source is another portion of the light sources located around the first light source. The second light source can be any of the other portion of the light sources located around the first light source, and the second light source may also include multiple sub-light sources. Typically, the first light source is directly opposite the central region 631 of the compound eye lens 630, or is located on the central axis of the central region 631. In the first operating mode, the first light source is in the on state and the second light source is in the off state. The light emitted by the first light source constitutes the illumination light, which passes through the central region 631 of the compound eye lens 630 and does not pass through the peripheral region 632. Alternatively, when the first light source is in the on state and the second light source is in the off state, the light emitted by the first light source passes through the central region 631 (microlens array region) of the compound eye lens 630 and does not pass through the peripheral region 632 (non-microconvex lens array region). In the second operating mode, both the first and second light sources are turned on. The light emitted by the first and second light sources together constitute the illumination light, which passes through the central region 631 and the peripheral region 632 of the compound eye lens 630, meaning the illumination light covers the entire area of ​​the compound eye lens 630. Alternatively, both the first and second light sources are turned on, and the light emitted by the first and second light sources passes through the central region 631 and the peripheral region 632 of the compound eye lens 630.

[0070] Figure 13 yes Figure 6 A schematic diagram of another possible implementation of the lighting device shown. Figure 13 The left side is a magnified schematic diagram. Taking a light source 610 composed of multiple lasers as an example... Figure 13As shown, the light source 610 may include a first light source 611 and a second light source 612 located around the first light source 611. The second light source 612 may include multiple sub-light sources. By controlling the switch of the laser, when the first light source 611 is turned on and the second light source 612 is turned off, the emitted light from the first light source 611 is as shown by the solid line, so that the illumination light formed by the light source only passes through the central region 631 of the compound eye lens 630 to form a uniform light spot, which is then focused by the focusing lens 640 onto the color wheel 650. The illuminated color wheel 650 produces a uniformly distributed light spot, that is, a first surface-distributed light spot is formed. Furthermore, when both the first light source 611 and the second light source 612 are activated, the illumination light generated by all the light sources passes through the central region 631 and the peripheral region 632 (i.e., the microlens array region and the non-micro-convex lens array region) of the compound eye lens 630. The emitted light from the second light source 612, as shown by the dotted line, causes the illumination light to form a surface distribution with a strong center and a weak periphery behind the compound eye lens 630. Consequently, a light spot with a strong center and a weak periphery is also formed at the color wheel 650, thus forming a second surface distribution light spot. Finally, the second beam required for high-beam illumination is formed through the lens 690, meeting the relevant regulatory requirements for high-beam illumination beams.

[0071] In the optical path of the lighting device 600 of this application embodiment, a compound eye lens 630 is provided. The central region 631 of the compound eye lens 630 is a microlens array region composed of multiple convex microlenses, and the peripheral region 632 of the compound eye lens 630 is a non-micro-convex lens array region. By using the compound eye lens 630, which is not a completely micro-array, to modulate the optical devices in the optical path, two operating modes can be achieved. In the first operating mode, the illumination light only passes through the central region 631 and does not pass through the peripheral region 632 to form a first-surface distribution of light, which can meet the uniform light pattern distribution required for illumination display. In the second operating mode, the illumination light passes through both the central region 631 and the peripheral region 632 to form a second-surface distribution of light, which can meet the requirement of a strong central brightness light pattern distribution required for high beam illumination. This application embodiment helps to balance the strong central brightness light pattern distribution required for high beam illumination and the uniform light pattern distribution required for projection display illumination.

[0072] This application also provides a vehicle. Figure 14 This is a schematic diagram of the constituent units / partial constituent units of the vehicle provided in the embodiments of this application. For example... Figure 14 As shown, vehicle 1400 may include: vehicle body 1410 and lighting device 600 as described above.

[0073] Those skilled in the art will understand that Figure 14 This is merely an example of vehicle 1400 and does not constitute a limitation on the vehicle. It may include more or fewer parts than shown, or combine certain parts, or use different parts.

[0074] It should be understood that the vehicles in the embodiments of this application can be wheeled vehicles or work equipment on land. Vehicles can be motor vehicles, including those used for passenger transport, goods transport, and specialized engineering operations. Vehicles can be passenger cars and freight cars. Passenger cars can be private cars, buses, commercial vehicles, or even soft-seat cars, hard-sleeper cars, dining cars, baggage cars, postal cars, etc. Freight cars can be flatcars, open wagons, covered wagons, tank cars, refrigerated cars, etc. Vehicles can also be special vehicles, such as armored cash transport vehicles, vans, or vehicle-mounted modular units. Vans or vehicle-mounted modular units are special-purpose equipment used in geological exploration, water conservancy projects, construction projects, military field operations, communications, and other operations requiring fieldwork or combat. Vehicles in the embodiments of this application can be vehicles powered by traditional energy sources, such as gasoline, diesel, or natural gas, or vehicles powered by new energy sources, such as electric vehicles or hydrogen fuel cell vehicles. The embodiments of this application do not specifically limit the type of vehicle.

[0075] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0076] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0077] In the embodiments provided in this application, it should be understood that the disclosed apparatus / device and method can be implemented in other ways. For example, the apparatus / device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0078] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0079] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0080] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0081] Furthermore, in the description of this application and the appended claims, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A lighting device, characterized in that, include: At least one light source for emitting at least one illumination light; A compound eye lens is located in the outgoing light path of the at least one light source. The compound eye lens includes a microlens array region composed of multiple convex microlenses and a peripheral region surrounding the microlens array region. The illumination spot covers the microlens array area of ​​the compound eye lens to form a first surface distribution of light. The illuminance uniformity of the first surface distribution of light is greater than a first threshold. The first surface distribution of light passes through the lens to form a first beam. The illumination light spot covers the microlens array area and the surrounding area to form a second surface-distributed light beam. The ratio of the illuminance at the center position to the illuminance at the surrounding position of the second surface-distributed light beam is greater than a second threshold. The second surface-distributed light beam passes through the lens and is emitted to form a second beam.

2. The lighting device according to claim 1, characterized in that, The lighting device also includes: The first lens is located between the at least one light source and the compound eye lens; The first lens is used to adjust the light spot coverage area of ​​the illumination light entering the compound eye lens, wherein the light spot coverage area is the microlens array area, or the light spot coverage area is the microlens array area and the surrounding area.

3. The lighting device according to claim 2, characterized in that, The first lens is a collimating lens, and the focal length of the first lens is adjustable. When the focal length of the first lens is the first focal length, the area covered by the illumination light entering the compound eye lens is the microlens array area. When the focal length of the first lens is the second focal length, the area covered by the illumination light entering the compound eye lens is the microlens array area and the surrounding area.

4. The lighting device according to claim 3, characterized in that, When the distance between the collimating lens and the at least one light source is a first distance, the area covered by the spot of the illumination light entering the compound eye lens is the microlens array area. When the distance between the collimating lens and the at least one light source is a second distance, the area covered by the illumination light entering the compound eye lens is the microlens array area and the surrounding area.

5. The lighting device according to claim 4, characterized in that, The position of the first lens can be moved relative to the at least one light source.

6. The lighting device according to claim 3, characterized in that, The focal length of the first lens is adjusted based on its refractive index, which is adjusted by one or more of the following methods: optical, electrical, thermal, mechanical, or chemical.

7. The lighting device according to claim 1, characterized in that, The at least one light source includes: A first light source and a second light source located around the first light source; When the first light source is in the on state and the second light source is in the off state, the light emitted by the first light source passes through the microlens array region of the compound eye lens and does not pass through the peripheral region; Both the first light source and the second light source are in the on state. The light emitted by the first light source and the light emitted by the second light source pass through the microlens array region and the surrounding region of the compound eye lens.

8. The lighting device according to any one of claims 1-7, characterized in that, The peripheral region of the compound eye lens is a region formed by diverging lenses.

9. The lighting device according to any one of claims 1-7, characterized in that, The at least one light source includes one or more of light-emitting diodes, laser diodes, and lasers, and the lighting device further includes: A color wheel, located in the output light path of the compound eye lens, is used to convert the illumination light into target light; The illumination light is an excitation light with a first wavelength range, used to excite the color wheel to generate a laser with at least a second wavelength range. The light spot covering the microlens array area forms a first surface distribution of light at the color wheel. The light spot covering the microlens array area and the surrounding area forms a second surface distribution of light at the color wheel.

10. A vehicle, characterized in that, include: The vehicle body, and the lighting device as described in any one of claims 1 to 9, wherein the lighting device is disposed on the vehicle body.

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