Sunlight simulation device

Abstract

The utility model discloses a sunlight simulation device, and relates to the technical field of optics. The sunlight simulation device comprises a light source; the light collection module is used for collecting and converging the light beams emitted by the light source and emitting the converged light beams; the angle compression module is arranged in the light beam output direction of the light collection module and used for compressing the divergence angle of the light beam into a target angle range and emitting the compressed light beam; and the fly's-eye lens is arranged in the light beam output direction of the angle compression module and used for dodging the light beams and emitting the dodged light beams, and the target angle range is matched with the set incident angle range of the fly's-eye lens. The angle compression module is arranged to compress the divergence angle of the light beam, so that the divergence angle of the light beam is within the set incident angle range of the fly's-eye lens, and the light beam emitted after dodging treatment of the fly's-eye lens has the characteristics of small divergence angle and uniform irradiance. Therefore, the sunlight simulation device can meet related test requirements under the condition of low preparation cost.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to a sunlight simulation device. Background Art

[0002] For the projection display device of the vehicle, sunlight will be incident against the projection light path at a suitable angle, and because the projection light path has a divergent effect on the light beam, the reverse projection light path has a convergent effect on the sunlight, which causes the display panel to be ablated when the sunlight is projected onto the display panel. Since the sunlight simulation device can stably and efficiently simulate the sunlight exposure environment, in order to avoid the problem of sunlight backflow, the projection display device is tested by using the sunlight simulation device.

[0003] In the related technology, sunlight simulation devices are mainly used in aerospace and photovoltaic test scenarios. The sunlight simulation devices in aerospace applications are complex in structure and too costly, while the sunlight simulation devices in photovoltaic applications are simple in structure and low in preparation cost. However, there are problems such as excessive divergence angle of the outgoing light beam and poor irradiation uniformity. Therefore, traditional sunlight simulation devices are difficult to meet the testing requirements of vehicle projection display devices at a low cost. Utility Model Content

[0004] An embodiment of the present application provides a sunlight simulation device, comprising: a light source for emitting a light beam; a light collecting module, wherein the light source is arranged inside the light collecting module, the light collecting module is used to collect and converge the light beam, and emit the converged light beam; an angle compression module, arranged in the light beam output direction of the light collecting module, the angle compression module is used to compress the divergence angle of the converged light beam to within a target angle range, and emit the compressed light beam; a fly-eye lens, arranged in the light beam output direction of the angle compression module, the fly-eye lens is used to perform uniform light processing on the compressed light beam, and emit the uniform light beam, the target angle range matches the set incident angle range of the fly-eye lens.

[0005] Optionally, the angle compression module includes a first convex lens and a second convex lens; the first convex lens is arranged between the light collection module and the second convex lens, the first convex lens is used to converge the converged light beam and project the converged light beam to the second convex lens, the focus of the first convex lens coincides with the focus of the second convex lens, and the focal length of the first convex lens is smaller than the focal length of the second convex lens; the second convex lens is used to compress the divergence angle of the incident light beam to within the target angle range, and emit the compressed light beam to the compound eye lens.

[0006] Optionally, the angle compression module also includes a first square rod, which is arranged between the light collecting module and the first convex lens, and the first square rod is used to perform angle homogenization processing on the converged light beam, and compress the divergence angle of the light beam with uniform divergence angle after the angle homogenization processing, so as to emit the light beam with compressed divergence angle to the first convex lens.

[0007] Optionally, the angle compression module includes a second square rod, which is used to perform angle homogenization processing on the converged light beam, and compress the divergence angle of the light beam with uniform divergence angle after the angle homogenization processing, so as to emit the light beam with compressed divergence angle to the fly-eye lens.

[0008] Optionally, the sunlight simulation device further comprises a variable iris, wherein the variable iris is arranged at a light exit of the fly-eye lens, and the variable iris is used to limit a divergence angle of the light beam emitted from the fly-eye lens.

[0009] Optionally, the sunlight simulation device further comprises a collimating lens, which is arranged in the light beam output direction of the variable iris, and the variable iris is located at the focus of the collimating lens, and the collimating lens is used to collimate the incident light beam to emit a collimated light beam with a divergence angle in the range of [-θ, θ] after collimation, where θ is:

[0010]

[0011] Wherein, D is the aperture size of the variable iris, and f is the focal length of the collimating lens.

[0012] Optionally, the compound eye lens includes a first microlens array and a second microlens array, the first microlens array and the second microlens array are arranged in parallel, and the first microlens array includes a plurality of first microlenses, the second microlens array includes a plurality of second microlenses, and the plurality of first microlenses correspond one to one to the plurality of second microlenses; the ratio of the aperture size of the variable iris to the size of the first microlens, and the ratio of the aperture size of the variable iris to the size of the second microlens are both greater than or equal to 7.

[0013] Optionally, a second microlens corresponding to each first microlens is provided at the focal point of each first microlens; each first microlens is used to converge the compressed light beam to the second microlens corresponding to each first microlens, and each second microlens is used to diverge the incident light beam and emit the diverged light beam to the variable aperture.

[0014] Optionally, the light collecting module includes an ellipsoidal reflector cup and a spherical reflector cup, the light source is arranged at a first focus of the ellipsoidal reflector cup; the ellipsoidal reflector cup is used to reflect a first light beam and converge the reflected first light beam to a second focus of the ellipsoidal reflector cup, the first light beam is a partial light beam emitted by the light source; the spherical reflector cup is arranged at an opening of the ellipsoidal reflector cup, and the focus of the spherical reflector cup coincides with the first focus, the spherical reflector cup is used to reflect a second light beam and converge the reflected partial light beam to the first focus, so that the ellipsoidal reflector cup reflects and converges the second light beam to the second focus, the second light beam is other light beams in the light beam emitted by the light source except the first light beam; the angle compression module is used to receive the first light beam and the second light beam converged by the ellipsoidal reflector cup, and compress the divergence angles of the converged first light beam and the second light beam to within a target angle range, so as to emit the compressed first light beam and the second light beam.

[0015] Optionally, the sunlight simulation device further comprises a first aperture, which is disposed between the light collecting module and the angle compression module, and is used for filtering stray light in the converged light beam and projecting the filtered light beam to the angle compression module.

[0016] The sunlight simulation device provided by the present application includes: a light source for emitting a light beam; a light collecting module, the light source is arranged inside the light collecting module, the light collecting module is used to collect and converge the light beam, and emit the converged light beam; an angle compression module is arranged in the light beam output direction of the light collecting module, the angle compression module is used to compress the divergence angle of the converged light beam to within a target angle range, and emit the compressed light beam; a compound eye lens is arranged in the light beam output direction of the angle compression module, the compound eye lens is used to perform homogenization treatment on the compressed light beam, and emit the homogenized light beam, and the target angle range matches the set incident angle range of the compound eye lens. Based on this, by arranging the angle compression module in the sunlight simulation device to compress the divergence angle of the light beam, and making the divergence angle of the compressed light beam within the set incident angle range of the compound eye lens, the light beam emitted after the homogenization treatment of the compound eye lens has the properties of small divergence angle and uniform irradiance, so that the sunlight simulation device can meet the testing requirements of the projection display device of the vehicle. At the same time, adding an angle compression module at the light output of the light collection module to compress the light beam divergence angle can shorten the optical path length of the sunlight simulation device, thereby reducing the volume of the sunlight simulation device and reducing the preparation cost of the device.

[0017] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic structural diagram of a sunlight simulation device provided in one embodiment of the present application is shown.

[0020] Figure 2 A schematic structural diagram of an angle compression module provided in one embodiment of the present application is shown.

[0021] Figure 3 A schematic structural diagram of an angle compression module provided in another embodiment of the present application is shown.

[0022] Figure 4 A schematic structural diagram of an angle compression module provided in yet another embodiment of the present application is shown.

[0023] Figure 5 A schematic structural diagram of a sunlight simulation device provided in another embodiment of the present application is shown.

[0024] Figure 6 A schematic structural diagram of a light collection module provided in an embodiment of the present application is shown.

[0025] Figure 7 A schematic structural diagram of a fly-eye lens provided in one embodiment of the present application is shown.

[0026] Figure 8 A schematic diagram of the optical path of a collimating lens provided in an embodiment of the present application is shown.

[0027] Fig. 9 A schematic structural diagram of a sunlight simulation device provided in yet another embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0029] The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the related art, the requirements for the light beam of the sunlight simulation device in aerospace applications are relatively high, that is, the light beam irradiance needs to be stable, the irradiance needs to be uniform, and the light beam divergence angle needs to be small. Complex structural designs are often used to meet the light beam requirements, and there are problems with high device preparation and maintenance costs. Among them, the irradiance of the light beam refers to the radiation flux of the light beam per unit area. In photovoltaic applications, the structure of the sunlight simulation device is simple and the preparation cost is low. It is usually composed of only a light source and a reflective cup, but the divergence angle of the emitted light beam is too large and the collimation effect is poor. The deviation in the light beam collimation will make it difficult for the sunlight simulation device to simulate the actual sunlight backflow effect, and therefore it is difficult to meet the testing requirements of the vehicle's projection display device.

[0032] Please refer to Figure 1 , Figure 1 The structure diagram of the sunlight simulation device 1 provided in one embodiment of the present application is shown. Figure 1 The sunlight simulation device 1 provided in the embodiment of the present application is described in detail. Figure 1 As shown, the sunlight simulation device 1 of the present embodiment includes a light source 10 , a light collecting module 20 , an angle compression module 30 and a fly-eye lens 40 .

[0033] Optionally, the light source 10 is used to emit a light beam, and the radiation spectrum energy distribution of the light beam emitted by the light source 10 is close to that of sunlight. The light source 10 includes, but is not limited to, a carbon arc lamp, a metal halide lamp, a xenon lamp, and a high-pressure sodium lamp. Since the light and electrical parameters of the xenon lamp are consistent, and the working state of the xenon lamp is less affected by changes in external conditions, a xenon lamp is usually selected as the light source 10 in this embodiment.

[0034] In this embodiment, since the light beam emitted by the light source 10 is a divergent light beam, a light collecting module 20 is provided, and the light source 10 is provided inside the light collecting module 20 to collect the divergent light beam emitted by the light source 10, thereby improving the utilization rate of the light beam emitted by the light source 10. That is, the light collecting module 20 is used to collect and converge the divergent light beam emitted by the light source 10, and emit the converged light beam, so that most of the light beam emitted by the light source 10 can be output along the light beam output direction of the sunlight simulation device 1.

[0035] In this embodiment, an angle compression module 30 and a fly-eye lens 40 are sequentially arranged in the light beam output direction of the light collection module 20. The angle compression module 30 is used to compress the divergence angle of the converged light beam to within a target angle range, and emit the light beam with compressed divergence angle to the fly-eye lens 40. The target angle range matches the set incident angle range of the fly-eye lens 40.

[0036] Based on the law of conservation of light spread, that is, for a light beam entering an optical element, the product of the incident angle of the light beam and the spot area of ​​the light beam on the incident surface is equal to the product of the exit angle of the light beam and the spot area of ​​the light beam on the exit surface. By setting an angle compression module 30 between the light collection module 20 and the fly-eye lens 40, the angle compression module 30 is used to compress the divergence angle of the light beam emitted by the light collection module 20 into the set incident angle range of the fly-eye lens 40, so that when the light collection module 20 emits a light beam, its divergence angle can be outside the set incident angle range of the fly-eye lens 40, that is, the light beam divergence angle is large, thereby greatly reducing the focal length of the light collection module 20. Therefore, compared with directly using the light collection device to emit a light beam with a divergence angle within the set incident angle range of the fly-eye lens 40, the method of adding the angle compression module 30 between the light collection module 20 and the fly-eye lens 40 can shorten the optical path length of the sunlight simulation device 1, thereby reducing the volume of the sunlight simulation device 1, which is conducive to reducing the preparation cost of the device.

[0037] Furthermore, the fly-eye lens 40 is used to perform homogenization processing on the light beam after the divergence angle is compressed and emitted by the light collection module 20, and emit the light beam after the homogenization processing. After the fly-eye lens 40 performs homogenization processing on the incident light beam, the irradiance of the light beam emitted by the fly-eye lens 40 is uniform and the divergence angle of the light beam is small.

[0038] It should be noted that the fly-eye lens 40 is usually formed by two groups of parallel microlens arrays, each group of microlens arrays includes a plurality of microlenses, and the plurality of microlenses on the light-entering surface correspond one-to-one to the plurality of microlenses on the light-emitting surface. When the incident angle of the light beam incident into the fly-eye lens 40 is outside the set incident angle range of the fly-eye lens 40, that is, when the divergence angle of the light beam incident into the fly-eye lens 40 is too large, the part of the light beam whose incident angle is outside the set incident angle range of the fly-eye lens 40 will be emitted to the microlens on the light-emitting surface that does not correspond to it after passing through the microlens on the light-entering surface, thereby forming a side lobe light beam. The large divergence angle of the side lobe light beam will result in poor collimation of the light beam finally emitted from the fly-eye lens 40, and uneven irradiance of the light beam on the target surface, making it difficult to meet the test requirements when the sunlight simulation device 1 is applied to a projection display device of a vehicle. The set incident angle range of the fly-eye lens 40 is the incident angle range of the light beam when the light beam can be emitted to the corresponding microlens on the light emitting surface after passing through the microlens on the light incident surface.

[0039] Optionally, the angle range is matched to a target angle range that is less than or equal to a set incident angle range of the fly-eye lens 40. When the angle compression module 30 compresses the divergence angle of the converged light beam, the optical performance of the angle compression module 30 is designed so that the divergence angle range of the light beam compressed by the angle compression module 30 matches the set incident angle range of the fly-eye lens 40, thereby avoiding the formation of side lobe beams in the light beam after the uniform light treatment by the fly-eye lens 40. Moreover, after the divergence angle of the light beam is compressed twice by the angle compression module 30 and the fly-eye lens 40, the divergence angle of the light beam emitted by the sunlight simulation device 1 is greatly reduced, and the irradiance uniformity of the light beam on the target surface is improved, so that the light beam emitted by the sunlight simulation device 1 can meet the test requirements of the projection display device of the vehicle.

[0040] In this embodiment, the sunlight simulation device 1 includes: a light source 10, which is used to emit a light beam; a light collecting module 20, the light source 10 is arranged inside the light collecting module 20, the light collecting module 20 is used to collect and converge the light beam, and emit the converged light beam; an angle compression module 30, which is arranged in the light beam output direction of the light collecting module 20, the angle compression module 30 is used to compress the divergence angle of the converged light beam to within a target angle range, and emit the compressed light beam; a fly-eye lens 40, which is arranged in the light beam output direction of the angle compression module 30, the fly-eye lens 40 is used to perform uniform light processing on the compressed light beam, and emit the uniform light beam, and the target angle range matches the set incident angle range of the fly-eye lens 40. Based on this, by setting an angle compression module 30 in the sunlight simulation device 1 to compress the divergence angle of the light beam, and making the divergence angle of the compressed light beam within the set incident angle range of the fly-eye lens 40, the light beam emitted after the light homogenization treatment of the fly-eye lens 40 has the properties of small divergence angle and uniform irradiance, so that the sunlight simulation device 1 can meet the testing requirements of the projection display device of the vehicle. At the same time, adding an angle compression module 30 at the light outlet of the light collection module 20 to compress the divergence angle of the light beam can shorten the optical path length of the sunlight simulation device 1, thereby reducing the volume of the sunlight simulation device 1 and reducing the preparation cost of the device.

[0041] As an implementation method, Figure 2 As shown, Figure 2 FIG. 3 is a schematic diagram showing the structure of an angle compression module 30 provided in an embodiment of the present application. In this embodiment, the angle compression module 30 includes a first convex lens 31 and a second convex lens 32 .

[0042] Optionally, the first convex lens 31 is arranged between the light collecting module and the second convex lens 32. The first convex lens 31 is used to converge the converged light beam and project the converged light beam to the second convex lens 32. The focus of the first convex lens 31 coincides with the focus of the second convex lens 32, that is, the relative distance between the first convex lens 31 and the second convex lens 32 is the sum of the focal length of the first convex lens 31 and the focal length of the second convex lens 32, and the focal length of the first convex lens 31 is smaller than the focal length of the second convex lens 32.

[0043] In this embodiment, the light beam emitted from the first convex lens 31 converges at the focus of the second convex lens 32. The second convex lens 32 can compress the divergence angle of the incident light beam to within the target angle range, while amplifying the spot of the incident light beam and emitting the compressed light beam to the compound eye lens.

[0044] Optionally, after the light beam emitted by the light collection module is converged by the first convex lens 31 and the second convex lens 32, the divergence angle of the light beam will be compressed to the target angle range, so that the incident angle of the light beam at the compound eye lens is within the set incident angle range, avoiding the formation of side lobe beams in the light beam after the compound eye lens performs uniform light processing on the incident light beam, so that after the divergence angle of the light beam is compressed twice by the angle compression module 30 and the compound eye lens, the light beam emitted by the sunlight simulation device can meet the test requirements of the vehicle's projection display device. At the same time, by setting the angle compression module 30 including the first convex lens 31 and the second convex lens 32 between the light collection module and the compound eye lens, the focal length of the light collection module set in the sunlight simulation device can be greatly reduced, thereby reducing the volume of the sunlight simulation device.

[0045] As an implementation method, Figure 3 As shown, Figure 3 FIG. 2 is a schematic diagram showing the structure of an angle compression module 30 provided in another embodiment of the present application. In this embodiment, the angle compression module 30 includes a first convex lens 31 , a second convex lens 32 and a first square rod 33 .

[0046] Optionally, the first convex lens 31 is arranged between the light collecting module and the second convex lens 32. The first convex lens 31 is used to converge the converged light beam and project the converged light beam to the second convex lens 32. The focus of the first convex lens 31 coincides with the focus of the second convex lens 32, and the focal length of the first convex lens 31 is smaller than the focal length of the second convex lens 32; the second convex lens 32 is used to compress the divergence angle of the incident light beam to within the target angle range, and emit the compressed light beam to the compound eye lens.

[0047] In this embodiment, the first square rod 33 is arranged between the light collecting module 20 and the first convex lens 31. The first square rod 33 is used to perform angle homogenization processing on the light beam converged by the light collecting module 20, and to compress the divergence angle of the light beam with uniform divergence angle after the angle homogenization processing, so as to emit the light beam with compressed divergence angle to the first convex lens 31.

[0048] Optionally, both the first square rod 33 and the fly-eye lens can perform homogenization on the incident light beam, but the difference from the fly-eye lens is that: the first square rod 33 is used to perform homogenization on the angular distribution of the light beam, so that the divergence angle of the light beam in all directions is uniform, thereby improving the uniformity of the light beam; the fly-eye lens is used to perform homogenization on the surface distribution of the light beam, so that the irradiance of the light beam on the target surface is uniform.

[0049] In this embodiment, by adding the first square rod 33 between the light collection module and the first convex lens 31, the first square rod 33 performs angle homogenization on the converged light beam, and when the angle homogenized light beam is emitted to the first convex lens 31, the light beam received by the first convex lens 31 is a light beam with a uniform divergence angle. When the first convex lens 31 and the second convex lens 32 perform divergence angle compression on the light beam with a uniform divergence angle emitted by the square rod, and emit the light beam to the fly-eye lens for homogenization again, the irradiance uniformity of the light beam finally emitted by the sunlight simulation device can be improved.

[0050] Furthermore, since the first square rod 33 has a certain taper, the first square rod 33 can perform angle homogenization on the light beam and also compress the divergence angle of the light beam to a certain extent. The taper of the first square rod 33 is the ratio of the diameter of the light outlet of the first square rod 33 to the diameter of the light entrance (the diameter of the light outlet is greater than the diameter of the light entrance), and the greater the taper of the first square rod 33, the better the effect of the first square rod 33 on compressing the divergence angle of the light beam. The first square rod 33 can be a solid square rod or a hollow square rod, and the shape of the first square rod 33 can be at least one of a square, a hexagon and an octagon, and preferably a square rod close to a circle is used.

[0051] In this embodiment, by compressing the divergence angle of the light beam through the first square rod 33, the first convex lens 31 and the second convex lens 32, the incident angle of the light beam incident on the fly-eye lens can be further reduced, thereby avoiding the formation of side lobe beams in the light beam emitted by the fly-eye lens, reducing the divergence angle of the light beam emitted by the sunlight module device, and improving the collimation of the emitted light beam, so that the final emitted light beam is closer to the illumination effect of sunlight.

[0052] As an implementation method, Figure 4 As shown, Figure 4 FIG. 2 is a schematic diagram showing the structure of an angle compression module 30 provided in another embodiment of the present application. In this embodiment, the angle compression module 30 includes a second square rod 34 .

[0053] In this embodiment, the second square rod 34 is used to perform angle homogenization processing on the converged light beam, and to compress the divergence angle of the light beam with uniform divergence angle after the angle homogenization processing, so as to emit the light beam with compressed divergence angle to the fly-eye lens.

[0054] Specifically, the second square rod 34 is used to perform homogenization on the angular distribution of the light beam, so that the divergence angle of the light beam in all directions is uniform, thereby improving the uniformity of the light beam, and after the light beam is emitted to the fly-eye lens and homogenized again, the irradiance uniformity of the light beam emitted by the sunlight simulation device can be improved. In addition, while the second square rod 34 performs angle homogenization on the light beam, it can also compress the divergence angle of the light beam to a certain extent, so that the incident angle of the light beam in the fly-eye lens is within the set incident angle range, avoiding the formation of side lobe beams in the light beam after the fly-eye lens performs homogenization on the incident light beam, so that after the divergence angle of the light beam is compressed twice by the second square rod 34 and the fly-eye lens, the light beam emitted by the sunlight simulation device can meet the test requirements of the vehicle projection display device.

[0055] Please refer to Figure 5 , Figure 5 FIG. 2 shows a schematic diagram of the structure of a sunlight simulation device provided by another embodiment of the present application. Figure 5 As shown, the sunlight simulation device of this embodiment includes a light source 10 , a light collecting module 20 , an angle compression module 30 and a fly-eye lens 40 .

[0056] In this embodiment, the light source 10 is disposed inside the light collection module 20. The light collection module 20 is used to collect and converge the light beam emitted by the light source 10, and emit the converged light beam to improve the utilization rate of the light beam emitted by the light source 10. The light collection module 20 includes an ellipsoidal reflector cup and a spherical reflector cup, such as Figure 6 As shown, Figure 6 A schematic structural diagram of a light collection module 20 provided in an embodiment of the present application is shown.

[0057] In this embodiment, the light source is disposed at the first focus F1 of the ellipsoidal reflector 21. The ellipsoidal reflector 21 is used to reflect the first light beam and converge the reflected first light beam to the second focus F2 of the ellipsoidal reflector 21. The first light beam is a partial light beam emitted by the light source.

[0058] Optionally, the spherical reflector 22 is disposed at the opening of the ellipsoidal reflector 21, and the focus of the spherical reflector 22 coincides with the first focus F1. The spherical reflector 22 is used to reflect the second light beam and converge the reflected part of the light beam to the first focus F1, so that the ellipsoidal reflector 21 reflects and converges the second light beam to the second focus F2. The second light beam is the other light beam in the light beam emitted by the light source except the first light beam. The angle compression module is used to receive the first light beam and the second light beam after being converged by the ellipsoidal reflector 21, and compress the divergence angle of the converged light beam to within the target angle range to emit the compressed light beam.

[0059] In this embodiment, the second light beam is actually the part of the light beam emitted by the light source that cannot be directly collected by the ellipsoidal reflector 21, that is, the spherical reflector 22 is used to reflect the second light beam that cannot be collected by the ellipsoidal reflector 21 back to the first focus F1 of the ellipsoidal reflector 21, so that the second light beam can be reflected again by the ellipsoidal reflector 21 and converged to the second focus F2 of the ellipsoidal reflector 21. Therefore, by using the light collection module 20 formed by the ellipsoidal reflector 21 and the spherical reflector 22, the collection efficiency of the light beam emitted by the light source can be improved, and the focal length of the light collection module 20 can be reduced while ensuring that the divergence angle of the emitted light beam is small, thereby reducing the size of the mask simulation device.

[0060] In this embodiment, the angle compression module 30 is arranged in the light beam output direction of the light collection module 20, and is used to compress the divergence angle of the converged light beam to within the target angle range, and emit the compressed light beam. In addition, the sunlight simulation device of this embodiment also includes a first aperture 50, which is arranged between the light collection module 20 and the angle compression module 30. The first aperture 50 is used to filter the stray light in the converged light beam, and project the filtered light beam to the angle compression module 30 to ensure that the radiation spectrum energy distribution of the light beam finally emitted by the sunlight simulation device is close to that of sunlight. Among them, stray light refers to incident light of other wavelengths away from the absorbed light, and stray light is easily generated when the light beam emitted by the light source 10 is reflected by the optical elements in the sunlight simulation device.

[0061] In this embodiment, the fly-eye lens 40 is arranged in the light beam output direction of the angle compression module 30, and is used to perform homogenization processing on the compressed light beam and emit the homogenized light beam, and the target angle range matches the set incident angle range of the fly-eye lens 40. Among them, the fly-eye lens 40 can also adjust the spot of the light beam, and the shape of the fly-eye lens 40 is set according to the spot shape required for the sunlight simulation test, so that the spot of the light beam finally emitted by the sunlight simulation device can meet the test requirements.

[0062] Furthermore, the sunlight simulation device of this embodiment further includes a variable iris 60, which is disposed at the light exit of the fly-eye lens 40, and is used to limit the divergence angle of the light beam emitted by the fly-eye lens 40. Figure 7 As shown, Figure 7 FIG. 4 is a schematic diagram showing the structure of a fly-eye lens 40 provided in an embodiment of the present application. In this embodiment, the fly-eye lens 40 includes a first microlens array 41 and a second microlens array 42 .

[0063] Optionally, the first microlens array 41 and the second microlens array 42 are arranged in parallel, and the first microlens array 41 includes a plurality of first microlenses 411 , and the second microlens array 42 includes a plurality of second microlenses 421 , and the plurality of first microlenses 411 correspond to the plurality of second microlenses 421 one by one.

[0064] In this embodiment, a second microlens 421 corresponding to each first microlens 411 is provided at the focal point of each first microlens 411, and the incident angle of the light beam emitted by the angle compression module is within the set incident angle range of the fly-eye lens 40 at each first microlens 411, so that each first microlens 411 can converge the compressed light beam to the second microlens 421 corresponding to each first microlens 411, thereby avoiding the formation of a side lobe light beam in the light beam emitted by the fly-eye lens 40. Each second microlens 421 is used to diverge the incident light beam and emit the diverged light beam to the variable aperture, and the light beams emitted by multiple second microlenses 421 overlap and image at infinity to form a uniform light spot, thereby achieving uniform light beam processing.

[0065] The ratio of the aperture size of the variable iris to the size of the first microlens 411, and the ratio of the aperture size of the variable iris to the size of the second microlens 421 are both greater than or equal to 7. That is, the through hole diameter of the variable iris needs to cover at least 7 microlenses to achieve a uniform light output effect, and the more microlenses there are, the more uniform the irradiance of the light beam on the target surface.

[0066] In some embodiments, different filters for selecting the radiation bands required for the test can be provided at the light outlet of the variable aperture 60, so that the light beam can achieve different irradiances and different spectral distributions on the target surface after passing through the variable aperture 60, so that by replacing the filter, the sunlight simulation device can simulate different test environments. Among them, the filter can be an infrared blocking plate for blocking infrared light, thereby filtering the infrared light in the light beam, so that when the test is performed based on the light beam emitted by the sunlight simulation device, the influence of visible light on the device can be analyzed; the filter can also be a light blocking plate for blocking visible light, thereby filtering the visible light in the light beam, so that when the test is performed based on the light beam emitted by the sunlight simulation device, the influence of infrared light on the device can be analyzed. In addition, the filter can also be a polarizer for filtering P-polarized light or S-polarized light, which is not limited here.

[0067] Furthermore, the sunlight simulation device of this embodiment further includes a collimating lens 70, which is disposed in the light beam output direction of the variable aperture 60, and the collimating lens 70 can be composed of a group or a single collimating lens 70 unit, which is not limited here. Figure 8 As shown, Figure 8 FIG. 1 is a schematic diagram showing the optical path of a collimating lens 70 provided in an embodiment of the present application.

[0068] In this embodiment, the variable iris 60 is disposed at the focus of the collimating lens 70, that is, the relative distance between the variable iris 60 and the collimating lens 70 is equal to the focal length of the collimating lens 70. The collimating lens 70 is used to collimate the incident light beam to emit a collimated light beam with a divergence angle within the range of [-θ, θ] after collimation, where θ is:

[0069]

[0070] Wherein, D is the aperture size of the variable iris 60, and f is the focal length of the collimating lens 70. That is, when the focal length f of the collimating lens 70 remains unchanged, the smaller the aperture size D of the variable iris 60, the smaller the divergence angle of the light beam emitted after the collimation process of the collimating lens 70, so that by adjusting the aperture size D of the variable iris 60, the divergence angle of the light beam finally emitted by the sunlight simulation device can be adjusted, so that the light beam emitted by the sunlight simulation device can meet the test requirements of the projection display device of the vehicle.

[0071] In this embodiment, the divergence angle of the light beam is compressed by setting an angle compression module 30 in the sunlight simulation device, and the divergence angle of the compressed light beam is within the set incident angle range of the fly-eye lens 40, so that the irradiance of the light beam emitted after the fly-eye lens 40 is uniform, and a variable aperture 60 for limiting the divergence angle of the light beam is set at the light outlet of the fly-eye lens 40, so that the divergence angle of the light beam finally emitted by the sunlight simulation device is small, meeting the test requirements of the projection display device of the vehicle. At the same time, the sunlight simulation device of the embodiment of the present application has a simple structure and a small device size, which reduces the preparation cost of the device, so that the sunlight simulation device can meet the relevant test requirements at a low preparation cost.

[0072] Please refer to Fig. 9 , Fig. 9 FIG. 2 shows a schematic diagram of the structure of a sunlight simulation device provided by another embodiment of the present application. Fig. 9 As shown, the sunlight simulation device of this embodiment includes the light source 10, light collection module 20, angle compression module 30, fly-eye lens 40, first aperture 50, variable aperture 60 and collimating lens 70 described in the above embodiment, which will not be repeated here.

[0073] Optionally, the sunlight simulation device further includes a reflector 80 , which is disposed in the light beam output direction of the variable aperture 60 . The reflector 80 is used to change the transmission direction of the light beam when receiving the light beam emitted by the variable aperture 60 , and reflect the light beam to the collimating lens 70 .

[0074] In this embodiment, when a reflector 80 is set between the variable aperture 60 and the collimating lens 70 to adjust the transmission direction of the light beam, the reflection output direction of the reflector 80 can be changed according to the test requirements of the vehicle's projection display device, and the setting of the reflector 80 reduces the size of the sunlight simulation device and reduces the preparation cost of the device.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A sunlight simulation device, characterized in that: The sunlight simulation device comprises: A light source, for emitting a light beam; A light collecting module, wherein the light source is disposed inside the light collecting module, and the light collecting module is used to collect and converge the light beams and emit the converged light beams; An angle compression module is arranged in the light beam output direction of the light collection module, and is used to compress the divergence angle of the converged light beam to within a target angle range, and emit the compressed light beam; A fly-eye lens is arranged in the light beam output direction of the angle compression module, and is used to perform light homogenization on the compressed light beam and emit the light beam after light homogenization. The target angle range matches the set incident angle range of the fly-eye lens.

2. The sunlight simulation device according to claim 1, characterized in that: The angle compression module includes a first convex lens and a second convex lens; The first convex lens is disposed between the light collecting module and the second convex lens, and is used to converge the converged light beam and project the converged light beam to the second convex lens, the focus of the first convex lens coincides with the focus of the second convex lens, and the focal length of the first convex lens is smaller than the focal length of the second convex lens; The second convex lens is used to compress the divergence angle of the incident light beam into the target angle range, and emit the compressed light beam to the fly-eye lens.

3. The sunlight simulation device according to claim 2, characterized in that: The angle compression module also includes a first square rod, which is arranged between the light collecting module and the first convex lens. The first square rod is used to perform angle homogenization processing on the converged light beam, and compress the divergence angle of the light beam with uniform divergence angle after the angle homogenization processing, so as to emit the light beam with compressed divergence angle to the first convex lens.

4. The sunlight simulation device according to claim 1, characterized in that: The angle compression module includes a second square rod, which is used to perform angle homogenization processing on the converged light beam and compress the divergence angle of the light beam with uniform divergence angle after the angle homogenization processing, so as to emit the light beam with compressed divergence angle to the fly-eye lens.

5. The sunlight simulation device according to claim 1, characterized in that: The sunlight simulation device also includes a variable iris, which is arranged at the light exit of the fly-eye lens and is used to limit the divergence angle of the light beam emitted by the fly-eye lens.

6. The sunlight simulation device according to claim 5, characterized in that: The sunlight simulation device further comprises a collimating lens, which is arranged in the light beam output direction of the variable iris, and the variable iris is located at the focus of the collimating lens, and the collimating lens is used to collimate the incident light beam to emit a collimated light beam with a divergence angle within the range of [-θ, θ] after collimation, where θ is: θ=2tan ―1 2 D f ; Wherein, D is the aperture size of the variable iris, and f is the focal length of the collimating lens.

7. The sunlight simulation device according to claim 5, characterized in that: The fly-eye lens includes a first microlens array and a second microlens array, the first microlens array and the second microlens array are arranged in parallel, and the first microlens array includes a plurality of first microlenses, the second microlens array includes a plurality of second microlenses, and the plurality of first microlenses correspond to the plurality of second microlenses one by one; A ratio of the aperture size of the variable iris to the size of the first microlens, and a ratio of the aperture size of the variable iris to the size of the second microlens are both greater than or equal to 7.

8. The sunlight simulation device according to claim 7, characterized in that: A second microlens corresponding to each first microlens is disposed at the focus of each first microlens; Each of the first microlenses is used to converge the compressed light beam to the second microlens corresponding to each of the first microlenses, and each of the second microlenses is used to diverge the incident light beam and emit the diverged light beam to the variable aperture.

9. The sunlight simulation device according to any one of claims 1 to 8, characterized in that: The light collection module includes an ellipsoidal reflector cup and a spherical reflector cup, and the light source is arranged at a first focus of the ellipsoidal reflector cup; The ellipsoidal reflective cup is used to reflect a first light beam and converge the reflected first light beam to a second focus of the ellipsoidal reflective cup, wherein the first light beam is a partial light beam emitted by the light source; The spherical reflector is disposed at the opening of the ellipsoidal reflector, and the focus of the spherical reflector coincides with the first focus. The spherical reflector is used to reflect the second light beam and converge the reflected part of the light beam to the first focus, so that the ellipsoidal reflector reflects and converges the second light beam to the second focus. The second light beam is the other light beam in the light beam emitted by the light source except the first light beam. The angle compression module is used to receive the first light beam and the second light beam converged by the ellipsoidal reflective cup, and compress the divergence angles of the converged first light beam and the second light beam to within a target angle range to emit the compressed first light beam and the second light beam.

10. The sunlight simulation device according to any one of claims 1 to 8, characterized in that: The sunlight simulation device also includes a first aperture, which is arranged between the light collection module and the angle compression module. The first aperture is used to filter stray light in the converged light beam and project the filtered light beam to the angle compression module.

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