Airborne imaging device, heads-up display system, and vehicle

Abstract

This application relates to an aerial imaging device, a head-up display system, and a vehicle. The aerial imaging device includes a light source, a beam splitter, and a retroreflective imaging assembly. The light source emits initial light rays. The beam splitter is positioned in the path of the initial light rays and transmits a portion of the initial light rays to form transmitted light rays and reflects another portion of the initial light rays to form reflected light rays. The retroreflective imaging assembly is positioned in the path of the transmitted and reflected light rays and retroreflects the transmitted light rays to form a first retroreflected light ray and retroreflects the reflected light rays to form a second retroreflected light ray. The beam splitter also reflects the first retroreflected light rays to the imaging area and transmits the second retroreflected light rays to the imaging area. Compared to related technologies, where retroreflection only targets the light rays reflected by the beam splitter, this technical solution utilizes a retroreflective imaging assembly to both retroreflect transmitted and reflected light rays, thereby improving light utilization.

Description

Technical Field

[0001] This application relates to the field of optical technology, and in particular to an aerial imaging device, a head-up display system, and a vehicle. Background Technology

[0002] 3D display technology can display realistic 3D images, reconstruct information about 3D objects or scenes from different angles, and accurately represent spatial occlusion relationships, thus attracting widespread attention in various fields. Aerial imaging display technology transforms 3D light field images into images floating in the air, providing viewers with a truly 3D experience. This technology creates an immersive, suspended, true 3D display effect and is considered the most promising 3D display technology.

[0003] In related technologies, a dihedral mirror is used to perform two total internal reflections to redirect and converge light onto the other side of the flat panel for imaging. However, this method has low light utilization, resulting in low image brightness and poor display effect. Summary of the Invention

[0004] This application provides an aerial imaging device, a head-up display system, and a vehicle, which improves the light utilization rate of the aerial imaging device, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, an aerial imaging device is provided, comprising:

[0006] A light source, used to emit initial light;

[0007] A beam splitter, disposed in the path of the initial ray, is used to transmit a portion of the initial ray to form a transmitted ray and to reflect another portion of the initial ray to form a reflected ray; and

[0008] An antireflection imaging component is disposed on the path of the transmitted light and the reflected light, and is used to antireflect the transmitted light to form a first antireflected light, and antireflect the reflected light to form a second antireflected light;

[0009] The beam splitter is also used to reflect the first retroreflected light to the imaging area and transmit the second retroreflected light to the imaging area.

[0010] Optionally, the retroreflection imaging assembly includes a plurality of retroreflection imaging elements, some of which are disposed in the optical path of the transmitted light rays for retroreflecting the transmitted light rays into the first retroreflected light rays;

[0011] Another part of the retroreflective imaging element is disposed in the optical path of the reflected light, and is used to retroreflect the reflected light into the second retroreflective light.

[0012] Optionally, the plurality of retroreflective imaging elements include a first retroreflective imaging element disposed in the optical path of the transmitted light and a second retroreflective imaging element disposed in the optical path of the reflected light, wherein the first retroreflective imaging element and the second retroreflective imaging element are connected and form an angle, wherein the angle is greater than 0° and less than 180°.

[0013] Optionally, the included angle is 90°.

[0014] Optionally, the orthogonal projection of the beam splitter onto the first retroreflective imaging element completely covers the first retroreflective imaging element, and / or, the orthogonal projection of the beam splitter onto the second retroreflective imaging element completely covers the second retroreflective imaging element.

[0015] Optionally, the first retroreflective imaging element and the second retroreflective imaging element are symmetrical about the plane in which the beam splitter is located.

[0016] Optionally, the retroreflective imaging element includes a light-transmitting substrate and a plurality of retroreflective mirrors disposed on the light-transmitting substrate for reflecting light along the original path.

[0017] Optionally, a plurality of the retroreflector arrays are arranged on the side of the light-transmitting substrate away from the beam splitter, with the reflective surface of the retroreflectors facing the light-transmitting substrate.

[0018] Optionally, the reflective surface is provided with a reflective metal layer.

[0019] Optionally, the shape of the retroreflector's orthogonal projection toward the light-transmitting substrate is a triangle or a hexagon.

[0020] Optionally, the shape of the retroreflector's orthogonal projection toward the light-transmitting substrate is an equilateral triangle.

[0021] Optionally, the retroreflector includes a first reflector, a second reflector, and a third reflector, wherein the first reflector, the second reflector, and the third reflector are adjacent to each other and connected to each other, and the first reflector, the second reflector, and the third reflector are perpendicular to each other.

[0022] Optionally, the first reflector, the second reflector, and the third reflector have the same shape and are all isosceles triangles.

[0023] According to a second aspect of this application, a head-up display system is also provided, including an aerial imaging device as described in the first aspect.

[0024] According to a third aspect of this application, a vehicle is also provided, including an aerial imaging device as described in the first aspect or a head-up display system as described in the second aspect.

[0025] In the aerial imaging device provided in this application embodiment, the initial light emitted from the light source is split by a beam splitter to form reflected and transmitted light. Then, a retroreflective imaging component is positioned along the paths of the transmitted and reflected light, enabling it to retroreflect both the transmitted and reflected light. Finally, the beam splitter reflects the first retroreflected light back to the imaging area and transmits the second retroreflected light back to the imaging area, achieving an aerial imaging effect. By utilizing the retroreflective imaging component to retroreflect both transmitted and reflected light, it ensures that the amount of light split by the beam splitter is reflected back to the beam splitter as much as possible, avoiding waste of light due to further reflection by non-reflective components. This improves light utilization and reduces the brightness requirements of the light source for aerial imaging, saving display costs.

[0026] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0029] Figure 1 This is a schematic diagram of the structure of the aerial imaging device provided in an exemplary embodiment of this disclosure;

[0030] Figure 2 This is a schematic diagram of the propagation path of light in an aerial imaging device according to an exemplary embodiment of the present disclosure;

[0031] Figure 3 This is a schematic diagram of the orthographic projection of the retroreflective imaging element in the aerial imaging device provided in an exemplary embodiment of this disclosure;

[0032] Figure 4 This is a schematic diagram of the propagation path of light passing through a retroreflector in an aerial imaging device according to an exemplary embodiment of the present disclosure.

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

[0034] 1. Light source; 2. Beam splitter; 3. Retroreflective imaging assembly; 31. Retroreflective imaging element; 311. Transparent substrate; 312. Retroreflector; 3121. First reflector; 3122. Second reflector; 3123. Third reflector; 3124. Reflective metal layer; 4. Imaging area. Detailed Implementation

[0035] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0036] This application provides an aerial imaging device 1, please refer to... Figure 1 .

[0037] The aerial imaging device includes a light source 1, a beam splitter 2, and a retroreflective imaging assembly 3. The light source 1 emits initial light. This light source 1 can be a display screen, and the image displayed on the screen can be projected to another location, such as in the air, via the beam splitter 2 and the retroreflective imaging assembly 3. The beam splitter 2 is positioned in the path of the initial light and transmits a portion of the initial light to form a transmitted light beam, and reflects another portion of the initial light beam to form a reflected light beam. The retroreflective imaging assembly 3 is positioned in the path of the transmitted and reflected light beams, and retroreflects the transmitted light beam to form a first retroreflected light beam, and retroreflects the reflected light beam to form a second retroreflected light beam. Compared to related technologies where retroreflection only targets the light reflected by the beam splitter 2, this application, by utilizing the retroreflective imaging assembly 3, can retroreflect both transmitted and reflected light beams, thus improving light utilization. Furthermore, the beam splitter 2 also reflects the first retroreflected light beam to the imaging area 4 and transmits the second retroreflected light beam to the imaging area 4.

[0038] The technical solution provided in this application uses a beam splitter 2 to split the initial light emitted from the light source 1, forming reflected and transmitted light. Then, a retroreflective imaging component 3 is positioned along the paths of the transmitted and reflected light, enabling it to retroreflect both the transmitted and reflected light. Finally, the beam splitter 2 reflects the first retroreflected light back to the imaging area 4 and transmits the second retroreflected light back to the imaging area 4, achieving an aerial imaging effect. By utilizing the retroreflective imaging component 3 to retroreflect both transmitted and reflected light, it ensures that the amount of light split by the beam splitter 2 is reflected back to the beam splitter 2 by the retroreflective imaging component 3 as much as possible. This avoids wasted light due to further reflection by unreflectable components, improving light utilization and reducing the brightness requirements of the light source 1 for aerial imaging, thus saving display costs.

[0039] In some embodiments, see Figure 1 and Figure 2 The retroreflective imaging assembly 3 includes multiple retroreflective imaging elements 31. A portion of the retroreflective imaging elements 31 are positioned in the optical path of the transmitted light, used to retroreflect the transmitted light into a first retroreflected light ray, which is then reflected by the beam splitter 2 to the imaging region 4. Another portion of the retroreflective imaging elements 31 are positioned in the optical path of the reflected light, used to retroreflect the reflected light into a second retroreflected light ray, which is then transmitted by the beam splitter 2 to the imaging region 4. By retroreflecting the transmitted light back to the beam splitter 2 through a portion of the retroreflective imaging elements 31, and then using the beam splitter 2 to reflect the first retroreflected light ray to the imaging region 4, the light transmitted through the beam splitter 2 can be used for imaging. Another part of the retroreflective imaging element 31 reflects the reflected light back to the beam splitter 2, and then the beam splitter 2 transmits the second retroreflected light to the imaging area 4, so that the light reflected by the beam splitter 2 can be used for imaging. This ensures that both the light transmitted and reflected by the beam splitter 2 can be used for imaging. Compared with related technologies, which can only use reflected or transmitted light for imaging, the light utilization rate is higher. Moreover, compared with the aerial imaging devices in related technologies, the brightness of the light source 1 is lower when maintaining the same imaging brightness, which helps to save costs.

[0040] It should be noted that, in this embodiment, the retroreflective imaging component 3 is specifically configured as two components: a first retroreflective imaging element and a second retroreflective imaging element. The first retroreflective imaging element is disposed in the optical path of the transmitted light and is used to retroreflect the transmitted light into a first retroreflected light ray. The beam splitter 2 is used to reflect the first retroreflected light ray to the imaging area 4. The second retroreflective imaging element is disposed in the optical path of the reflected light and is used to retroreflect the reflected light into a second retroreflected light ray. The beam splitter 2 is used to transmit the second retroreflected light ray to the imaging area 4.

[0041] In some embodiments, the first retroreflective imaging element and the second retroreflective imaging element are connected and form an angle greater than 0° and less than 180°. By connecting the two retroreflective imaging elements 31 together, transmitted and reflected light rays separated by the beam splitter 2 are prevented from escaping through the gap between the two retroreflective imaging elements 31, thus avoiding light waste. Furthermore, by controlling the angle range between 0° and 180°, the two retroreflective imaging elements 31 are prevented from being on the same plane, which would prevent reflected or transmitted light rays from being further reflected by the retroreflective imaging elements 31, thus avoiding light waste.

[0042] Furthermore, the angle between the two retroreflective imaging elements 31 is 90°, and the beam splitter 2 is set within the space covered by the angle formed by the two retroreflective imaging elements 31, so that the reflected and transmitted rays split by the beam splitter 2 can fall onto the corresponding retroreflective imaging elements 31 as much as possible.

[0043] In some embodiments, see Figure 2 The orthogonal projection of the beam splitter 2 onto the first retroreflective imaging element 31 completely covers the first retroreflective imaging element 31, ensuring that the light transmitted through the beam splitter 2 can fall completely onto the first retroreflective imaging element 31, thereby improving the light utilization rate.

[0044] Furthermore, the orthographic projection of the beam splitter 2 onto the second retroreflective imaging element completely covers the second retroreflective imaging element, ensuring that the light reflected by the beam splitter 2 can completely fall onto the second retroreflective imaging element, thereby improving light utilization. In other words, the orthographic projection of the beam splitter 2 onto both retroreflective imaging elements 31 completely covers the corresponding retroreflective imaging element 31, so that both reflected and transmitted light can completely fall onto the corresponding retroreflective imaging element 31, further improving light utilization.

[0045] In some embodiments, the two retroreflective imaging elements 31 are symmetrical about the plane of the beam splitter 2, which is beneficial for optimizing the propagation path of light. The light paths of the light transmitted and reflected by the beam splitter 2, as well as the first retroreflected light and the second retroreflected light, can all be optimized by the symmetrical structure of the two retroreflective imaging elements 31 about the plane of the beam splitter 2.

[0046] In some embodiments, the retroreflective imaging element 31 includes a light-transmitting substrate 311 and a plurality of retroreflectors 312 disposed on the light-transmitting substrate 311 for reflecting light back along the original path. Each retroreflector 312 can ensure that the light incident on the retroreflector 312 is reflected back along the original path to the beam splitter 2, and then the beam splitter 2 performs secondary beam splitting to achieve aerial imaging.

[0047] Further, please see Figure 3An array of multiple retroreflectors 312 is arranged on the side of the light-transmitting substrate 311 away from the beam splitter 2, with the reflective surfaces of the retroreflectors 312 facing the light-transmitting substrate 311. The array of retroreflectors 312 on the light-transmitting substrate 311 allows the retroreflectors 312 to cover the substrate 311 as much as possible, reducing light leakage gaps in the retroreflective imaging element 31 and improving light utilization efficiency. The reflective surfaces of the retroreflectors 312 facing the light-transmitting substrate 311 ensure that when light is incident on the substrate 311, it passes through the substrate 311, reaches the reflective surface, and is retroreflected back to the beam splitter 2.

[0048] Furthermore, the reflective surface is provided with a reflective metal layer 3124. The metal material of the reflective metal layer 3124 can be aluminum, chromium, silver, indium, etc. The metal material can be formed by chemical vapor deposition (CVD), physical vapor deposition (PVD), electroplating, etc. to form the reflective metal layer 3124.

[0049] In some embodiments, the shape of the retroreflector 312 projected onto the light-transmitting substrate 311 is either triangular or hexagonal. Whether triangular or hexagonal, it has only three reflective surfaces, and these three surfaces are perpendicular to each other to ensure that the retroreflector 312 can achieve retroreflection of light. In this embodiment, the shape of the retroreflector 312 projected onto the light-transmitting substrate 311 is triangular.

[0050] Furthermore, the retroreflector 312, when projected onto the light-transmitting substrate 311, has an equilateral triangle shape. This facilitates the placement of the three reflective surfaces and the arrangement of the retroreflectors 312 on the light-transmitting substrate 311, reducing gaps between adjacent retroreflectors 312. Specifically, the arrangement can be such that two adjacent retroreflectors 312 are mutually dependent, meaning that two retroreflectors 312 are arranged adjacently and their projected shape on the light-transmitting substrate 311 is a parallelogram. Two adjacent retroreflectors 312 form a retroreflection group, and multiple retroreflection groups are arranged in an array on the light-transmitting substrate 311, with adjacent retroreflection groups in contact with each other to eliminate gaps.

[0051] In some embodiments, see Figure 4The retroreflector 312 includes a first reflector 3121, a second reflector 3122, and a third reflector 3123. The first reflector 3121, the second reflector 3122, and the third reflector 3123 are adjacent to each other and connected. The first reflector 3121, the second reflector 3122, and the third reflector 3123 are perpendicular to each other, so that the light entering the retroreflector 312 can be reflected multiple times by the first reflector 3121, the second reflector 3122, and the third reflector 3123 to form retroreflected light that is parallel to the original light entering the retroreflector 312 but in the opposite direction.

[0052] For example, suppose the direction of the light ray A incident on the retroreflector 312 is represented by the vector (a,b,c). After being reflected by the xoy mirror, the direction vector becomes (a,b,-c). After being reflected by the xoz mirror, the direction vector becomes (-a,b,c). Finally, after being reflected by the yoz mirror, the direction vector becomes (-a,-b,-c). At this point, the light ray is parallel to the light ray A incident on the retroreflector 312 and has the opposite direction, thus achieving retroreflection.

[0053] In some embodiments, the first reflector 3121, the second reflector 3122, and the third reflector 3123 have the same shape and are all isosceles triangles. This is beneficial for improving light utilization and avoiding light waste caused by some light not being reflected by the three reflectors due to their different shapes and sizes. Furthermore, the fact that all three reflectors are isosceles triangles also facilitates the shaping and setting of the retroreflector 312 and the calculation and optimization of the light path.

[0054] The simulation calculation of the light utilization rate of the aerial imaging device of this application is as follows:

[0055] Assuming the reflectivity of beam splitter 2 is x, then its transmittance is 1-x, the utilization rate of the first portion of light is x(1-x), the utilization rate of the second portion of light is (1-x)x, and the total light utilization rate is 2x(1-x), as detailed in the table below:

[0056] Reflectivity of beam splitter (%) 10 20 30 40 50 40 30 20 10 Light utilization rate (%) 18 32 42 48 50 48 42 32 18

[0057] As can be seen from the table, when the reflectance is 10%, the light utilization rate can reach 18%; when the reflectance is 50%, the light utilization rate is 50%, which is the highest light utilization rate.

[0058] In some embodiments, the side length of the orthogonal projection of the retroreflector 312 onto the light-transmitting substrate 311 can range from 10µm to 30µm. Specifically, in this embodiment, the side length can be 10µm, 20µm, 30µm, etc.

[0059] In some embodiments, the light-transmitting substrate 311 in the retroreflective imaging element 31 is plate-shaped, and the beam splitter is also plate-shaped. The area of ​​the light-transmitting substrate 311 and the area of ​​the beam splitter are both positively correlated with the area to be imaged, and the side lengths of the beam splitter 2 and the light-transmitting substrate 311 are both in the range of 200mm to 500mm.

[0060] It should be noted that the arrows in the attached diagram are not part of the structure of this device, but rather a schematic diagram of the optical propagation path, and are not intended to limit the structure of this device.

[0061] The embodiments of this application provide a method for manufacturing an aerial imaging device, including designing the structure of a retroreflector 312 on a computer, obtaining a large-format retroreflector 312 array through close-packing, making a photolithography master mold through grayscale exposure and development processes, and then making a mold through anti-adhesion and UV adhesive transfer processes. After the mold is treated with anti-adhesion, the feature structure is copied onto a substrate such as PC, PET, or PMMA with a certain thickness and strength through a transfer process. Finally, a reflective metal film is deposited and screen-printed to obtain the retroreflector 312.

[0062] For example, the structure of the retroreflector 312 is designed and structural data is generated; the retroreflective imaging component 3 is designed and its data is transferred to a computer; photolithography is performed on a photolithography substrate, followed by development, drying, and anti-adhesion processes to create a master mold; the master mold is then placed on a mold transfer machine, coated with UV adhesive, a PC board is placed on the master mold, and after roll transfer and UV curing, the PC mold is obtained after demolding; the PC mold is then treated with anti-adhesion and coated with UV adhesive to form a PC and P board with a certain thickness and strength. ET, PMMA, and other substrates are placed on a PC mold, rolled and transferred, and then UV cured. After demolding, the substrate of retroreflector 312 is obtained. The substrate of retroreflector 312 is placed in a vacuum sputtering machine to deposit a layer of high-reflectivity metal film, which can be aluminum, chromium, silver, indium, etc. After designing the film system according to a specific reflectivity, a dielectric film is deposited on a PC, PET, PMMA, or other substrate of a specific thickness to obtain beam splitter 2. Two retroreflectors 312 and one beam splitter 2 are assembled according to a preset structure to obtain the aerial imaging device in this embodiment.

[0063] According to the second aspect disclosed in this application, a head-up display system is provided, including the aerial imaging device described in any of the foregoing embodiments. Since this head-up display system possesses all the structures and beneficial effects of the aforementioned aerial imaging device, further details are omitted here.

[0064] According to the third aspect disclosed in this application, a vehicle is provided that includes the aerial imaging device described in any of the foregoing embodiments or the head-up display system described in any of the foregoing embodiments. The vehicle has all the beneficial effects of the aerial imaging device or the head-up display system described above, which will not be repeated here.

[0065] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An aerial imaging device, characterized in that, include: Light source (1), used to emit initial light; A beam splitter (2) is disposed in the path of the initial ray and is used to transmit a portion of the initial ray to form a transmitted ray and reflect another portion of the initial ray to form a reflected ray; and Retroreflection imaging component (3) is disposed on the path of the transmitted light and the reflected light, and is used to retroreflect the transmitted light to form a first retroreflected light and to retroreflect the reflected light to form a second retroreflected light; The beam splitter (2) is also used to reflect the first retroreflected light to the imaging area (4) and transmit the second retroreflected light to the imaging area (4).

2. The aerial imaging device according to claim 1, characterized in that, The retroreflection imaging assembly (3) includes a plurality of retroreflection imaging elements (31), some of which are disposed in the optical path of the transmitted light and are used to retroreflect the transmitted light into the first retroreflected light. Another part of the retroreflective imaging element (31) is disposed in the optical path of the reflected light, for retroreflecting the reflected light as the second retroreflective light.

3. The aerial imaging device according to claim 2, characterized in that, The plurality of retroreflective imaging elements (31) include a first retroreflective imaging element disposed on the optical path of the transmitted light and a second retroreflective imaging element disposed on the optical path of the reflected light. The first retroreflective imaging element and the second retroreflective imaging element are connected and form an angle, the angle being greater than 0° and less than 180°.

4. The aerial imaging device according to claim 3, characterized in that, The included angle is 90°.

5. The aerial imaging device according to claim 3, characterized in that, The orthogonal projection of the beam splitter (2) onto the first retroreflective imaging element completely covers the first retroreflective imaging element, and / or the orthogonal projection of the beam splitter (2) onto the second retroreflective imaging element completely covers the second retroreflective imaging element.

6. The aerial imaging device according to claim 5, characterized in that, The first retroreflective imaging element and the second retroreflective imaging element are symmetrical about the plane in which the beam splitter (2) is located.

7. The aerial imaging apparatus according to any one of claims 2 to 6, characterized in that, The retroreflective imaging element (31) includes a light-transmitting substrate (311) and a plurality of retroreflective mirrors (312) disposed on the light-transmitting substrate for reflecting light along the original path.

8. The aerial imaging device according to claim 7, characterized in that, An array of multiple retroreflectors (312) is arranged on the side of the light-transmitting substrate (311) away from the beam splitter (2), with the reflective surface of the retroreflectors (312) facing the light-transmitting substrate (311).

9. The aerial imaging device according to claim 8, characterized in that, The reflective surface is provided with a reflective metal layer (3124).

10. The aerial imaging device according to claim 7, characterized in that, The shape of the orthographic projection of the retroreflector (312) onto the light-transmitting substrate (311) is a triangle or a hexagon.

11. The aerial imaging device according to claim 10, characterized in that, The shape of the orthographic projection of the retroreflector (312) onto the light-transmitting substrate (311) is an equilateral triangle.

12. The aerial imaging device according to claim 7, characterized in that, The retroreflector (312) includes a first reflector (3121), a second reflector (3122), and a third reflector (3123). The first reflector (3121), the second reflector (3122), and the third reflector (3123) are adjacent to each other and connected to each other. The first reflector (3121), the second reflector (3122), and the third reflector (3123) are perpendicular to each other.

13. The aerial imaging device according to claim 12, characterized in that, The first reflector (3121), the second reflector (3122), and the third reflector (3123) have the same shape and are all isosceles triangles.

14. A head-up display system, characterized in that, Includes the aerial imaging device as described in any one of claims 1 to 13.

15. A vehicle, characterized in that, Includes the aerial imaging device as described in any one of claims 1 to 13 or the head-up display system as described in claim 14.

Images