Light uniformizing device and projection ray machine

Abstract

The invention provides a light uniformizing device and a projection light machine, the light uniformizing device comprises at least two first light mixing areas and second light mixing areas corresponding to the first light mixing areas, any first light mixing area comprises a first partial transmission partial reflection mirror which is obliquely arranged and a first full reflection surface which is matched with the first partial transmission partial reflection mirror, the transmission area is used for transmitting the light entering the first light mixing area to other first light mixing areas and transmitting the light to the corresponding second light mixing area through the transmission area; any second light mixing area comprises a second partial transmission partial reflection mirror which is obliquely arranged and a second full reflection surface which is matched with the second partial transmission partial reflection mirror, and is used for transmitting the received light to other second light mixing areas and transmitting the received light to the corresponding first light mixing area through the transmission area. According to the light uniformizing device of the scheme, light rays with different wavelengths can enter different first light mixing areas and are mixed and circularly reflected in the light uniformizing device, and the light uniformizing effect of the light uniformizing device can be improved.

Description

Technical Field

[0001] The present application relates to the field of optical technologies, and particularly to a light homogenizing device and a projection optical machine. Background Art

[0002] With the development of augmented reality technology, light homogenizing technology is widely applied to the display module of augmented reality devices. Common light homogenizing devices mainly use light pipes as core components. The light pipes reflect light multiple times through special internal structures to achieve uniform distribution of light.

[0003] In the prior art, the light homogenizing uniformity of the light pipe is related to the glass material, length, and end face size. Increasing the length of the light pipe can improve the light homogenizing uniformity of the light pipe. However, most augmented reality devices are miniaturized devices, and the length of the light pipe is limited in a limited space, resulting in difficulty in improving the light homogenizing effect of the light homogenizing device. Summary of the Invention

[0004] The present application provides a light homogenizing device and a projection optical machine, aiming to improve the light homogenizing effect of the light homogenizing device.

[0005] In a first aspect, the present application provides a light homogenizing device, which includes an input device, a transmission device, and an output device arranged oppositely; wherein:

[0006] The input device has at least two first light mixing areas, the output device has second light mixing areas corresponding to each of the first light mixing areas, and each of the first light mixing areas has an input surface for coupling light, and at least two of the input surfaces are respectively used for coupling lights of different wavelengths;

[0007] The transmission device has a transmission area arranged between each of the first light mixing areas and the second light mixing areas, and the transmission area is used for allowing light to travel back and forth between the first light mixing areas and the second light mixing areas;

[0008] Any one of the first light mixing areas includes an inclined first partially transmissive and partially reflective mirror and a first total reflection surface cooperating with the first partially transmissive and partially reflective mirror, and is used for propagating the light entering this first light mixing area to other first light mixing areas and transmitting it to the corresponding second light mixing area through the transmission area;

[0009] Any one of the second light mixing areas includes an inclined second partially transmissive and partially reflective mirror and a second total reflection surface cooperating with the second partially transmissive and partially reflective mirror, and is used for propagating the received light to other second light mixing areas and transmitting it to the corresponding first light mixing area through the transmission area;

[0010] At least one of the second light mixing areas has an output surface for coupling out light.

[0011] In the above technical solution, light rays of different wavelengths can enter different light mixing regions of the light homogenizing device from different light coupling surfaces. Under the action of the first partially transmissive and partially reflective mirror and the first total reflection surface, part of the light rays can enter another light mixing region from one first light mixing region to achieve light mixing. Another part of the light rays can reach the second light mixing region through the transmission region. Under the action of the second partially transmissive and partially reflective mirror and the second total reflection surface, part of the light rays entering the second light mixing region can be transmitted to the adjacent second light mixing region. And under the action of the second partially transmissive and partially reflective mirror and the second total reflection surface in the adjacent second light mixing region, part of the light rays can reach the corresponding first light mixing region from the adjacent second light mixing region through the corresponding transmission region. Thereby, the light rays are circularly reflected between the first light mixing region and the second light mixing region, increasing the number of reflections of the light rays in the light homogenizing device, and thus improving the light homogenizing effect of the light homogenizing device.

[0012] In a possible implementation manner, each of the first light mixing regions includes a light coupling cavity surrounded by a plurality of side surfaces, and the first partially transmissive and partially reflective mirror is disposed in the light coupling cavity;

[0013] Among the plurality of side surfaces, the side surface opposite to the light coupling cavity of the adjacent first light mixing region is a first light transmissive surface, and the side surface opposite to the corresponding transmission region among the plurality of side surfaces is a second light transmissive surface; among the other side surfaces except the first light transmissive surface and the second light transmissive surface, one side surface is a light coupling surface, and the remaining side surfaces are first total reflection surfaces;

[0014] After the light rays enter any one of the light coupling cavities from the light coupling surface, under the action of the first partially transmissive and partially reflective mirror and the first total reflection surface, part of the light rays enter the adjacent light coupling cavity through the first light transmissive surface, and part of the light rays enter the opposite transmission region through the second light transmissive surface.

[0015] In a possible implementation manner, each of the second light mixing regions includes a light output cavity surrounded by a plurality of side surfaces, and the second partially transmissive and partially reflective mirror is disposed in the light output cavity;

[0016] Among the plurality of side surfaces, the side surface opposite to the light output cavity of the adjacent second light mixing region is a third light transmissive surface, and the side surface opposite to the corresponding transmission region among the plurality of side surfaces is a fourth light transmissive surface;

[0017] Among the other side surfaces except the third light transmissive surface and the fourth light transmissive surface: if the second light mixing region includes a light output surface, one side surface is a light output surface, and the remaining side surfaces are second total reflection surfaces; if the second light mixing region does not include a light output surface, the remaining side surfaces are all second total reflection surfaces

[0018] After the light enters any one of the coupling cavities from the light-coupling surface, under the action of the second partial transmission and partial reflection mirror and the second total reflection surface, part of the light enters the adjacent light-extracting cavity through the third light-transmitting surface, and part of the light enters the opposite transmission area through the fourth light-transmitting surface.

[0019] In a possible implementation manner, the light-extracting surface is a partial transmission and partial reflection surface.

[0020] In a possible implementation manner, at least part of the side surfaces of each transmission area are third total reflection surfaces.

[0021] In a possible implementation manner, at least two adjacent transmission areas are in contact with each other, and the side surfaces where the two adjacent transmission areas are in contact with each other are partial transmission and partial reflection surfaces.

[0022] In a possible implementation manner, the transmission device further includes a diffusing mirror;

[0023] The diffusing mirror is disposed in the transmission area and is used for diffusing light.

[0024] In a possible implementation manner, the light-coupling device includes four first light-mixing areas, and the four first light-mixing areas are arranged in a "field" shape;

[0025] Each first light-mixing area includes two first partial transmission and partial reflection mirrors, the two first partial transmission and partial reflection mirrors are arranged crosswise, and the two first partial transmission and partial reflection mirrors are respectively inclined towards two adjacent first light-mixing areas;

[0026] The two first partial transmission and partial reflection mirrors are used for propagating the light entering this first light-mixing area to two adjacent first light-mixing areas and transmitting it to the corresponding second light-mixing area through the transmission area.

[0027] In a possible implementation manner, when each first light-mixing area includes a coupling cavity surrounded by a plurality of side surfaces, the coupling cavity is a quadrangular prism shape, and the two first partial transmission and partial reflection mirrors are respectively arranged along two diagonal sections of the coupling cavity.

[0028] In a possible implementation manner, each second light-mixing area includes two second partial transmission and partial reflection mirrors, and the two second partial transmission and partial reflection mirrors are respectively inclined towards two adjacent first light-mixing areas;

[0029] The two second partial transmission and partial reflection mirrors are used for propagating the received light to two adjacent second light-mixing areas and transmitting it to the corresponding first light-mixing area through the transmission area.

[0030] In a possible implementation, when each of the second light mixing regions includes an extraction cavity surrounded by a plurality of side surfaces, the extraction cavity is a quadrangular prism, and the two second partially transmissive and partially reflective mirrors are respectively arranged along two diagonal sections of the extraction cavity.

[0031] In a second aspect, the present application provides a projection optical machine, which includes any one of the homogenizing devices as described above, and the homogenizing device is arranged in the optical path of the projection optical machine.

[0032] For the homogenizing device used in the above projection optical machine, light rays of different wavelengths can enter different light mixing regions of the homogenizing device from different light coupling surfaces. And under the action of the first partially transmissive and partially reflective mirror and the first total reflection surface, some light rays can enter another light mixing region from one first light mixing region to achieve light mixing. Another part of the light rays can reach the second light mixing region through the transmission region. Under the action of the second partially transmissive and partially reflective mirror and the second total reflection surface, some of the light rays entering the second light mixing region can be transmitted to an adjacent second light mixing region. And under the action of the second partially transmissive and partially reflective mirror and the second total reflection surface in the adjacent second light mixing region, some light rays can reach the corresponding first light mixing region from the adjacent second light mixing region through the corresponding transmission region. Thus, the light rays are circularly reflected between the first light mixing region and the second light mixing region, increasing the number of reflections of the light rays in the homogenizing device, thereby improving the light homogenizing effect of the homogenizing device. Description of the Drawings

[0033] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings required to be used in the embodiments. The drawings here are incorporated into the specification and constitute a part of this specification. These drawings show embodiments that conform to the present disclosure and are used together with the specification to illustrate the technical solutions of the present disclosure. It should be understood that the following drawings only show some embodiments of the present disclosure, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 Schematic diagram of the overall homogenizing device in the embodiment of the present application;

[0035] Figure 2 Schematic diagram of two groups of homogenizing components arranged in parallel in the embodiment of the present application;

[0036] Figure 3 An example diagram of the first light mixing region in the embodiment of the present application;

[0037] Figure 4 An example exploded view of the first light mixing region in the embodiment of the present application;

[0038] Figure 5An exemplary diagram of the second light mixing area in an embodiment of the present application;

[0039] Figure 6 An exemplary exploded view of the second light mixing area in an embodiment of the present application;

[0040] Figure 7 An exemplary diagram of the transmission area in an embodiment of the present application;

[0041] Figure 8 A schematic diagram of the optical path in an embodiment of the present application. Detailed implementation manners

[0042] To make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0043] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should have the ordinary meanings understood by those of ordinary skill in the art to which this disclosure belongs. The "first", "second", and similar terms used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0044] To facilitate the understanding of the light homogenizing device and the projection optical machine provided in the embodiments of the present application, first, its application scenario will be described. The light homogenizing device provided in the embodiments of the present application can be installed on the projection optical machine. The light homogenizing device can evenly distribute the input light, so that the output light has uniform brightness and color in a specific area, which is particularly important for display devices and can avoid problems such as uneven brightness and color difference.

[0045] With the development of augmented reality technology, light homogenizing technology is widely applied to the display modules of augmented reality devices. Common light homogenizing devices mainly use light bars as the core components. The light bar reflects light multiple times through a special internal structure. Each time the light is reflected, a virtual light source is generated. When the light is coupled out of the light bar after multiple reflections, it can be regarded as all the virtual light sources emitting light together, thereby achieving the light homogenizing effect and realizing the uniform distribution of light.

[0046] The light homogenization uniformity in the prior art is related to the glass material, length, and end face size of the light bar. By increasing the length of the light bar, the number of reflections of light within the light bar can be increased, thereby improving the light homogenization uniformity of the light bar. However, augmented reality (AR) devices are mostly miniaturized devices, especially many wearable devices, which will limit the space for installing the light homogenization device, resulting in a limited length of the light bar and making it difficult to improve the light homogenization effect of the light homogenization device, which will affect the display effect of the device. Especially for multi-chip packaged LED light sources, the virtual light source arrays formed by reflection are severely separated due to the offset of light-emitting chips with different wavelengths relative to the center position of the light bar, so it is even more necessary to improve the light homogenization effect of the light homogenization device to ensure the display quality of the device.

[0047] Based on this, the present application provides a light homogenization device, aiming to improve the light homogenization effect of the light homogenization device. The following will specifically introduce the light homogenization device provided by the present application in conjunction with the accompanying drawings.

[0048] Refer to Figure 1 , Figure 1 It is a schematic diagram of the overall light homogenization device in an embodiment of the present application. The light homogenization device provided in the embodiment of the present application includes an input coupling device 1, a transmission device 2, and an output coupling device 3. Light can enter the light homogenization device through the input coupling device 1, and then reach the output coupling device 3 through the transmission device 2. The light undergoes multiple reflections within the input coupling device 1, the transmission device 2, and the output coupling device 3 to achieve the light homogenization effect, and the finally homogenized light can be coupled out from the output coupling device 3.

[0049] The input coupling device 1 has at least two first light mixing regions 11, the output coupling device 3 has a second light mixing region 31 corresponding to each first light mixing region 11, and the transmission device 2 has a transmission region 21 disposed between each first light mixing region 11 and the first light mixing region 11. This transmission region 21 allows light to travel back and forth between the first light mixing region 11 and the second light mixing region 31. That is, in the transmission device 2, one first light mixing region 11, one transmission device 2, and one second light mixing region 31 can be regarded as a light homogenization component, and the light homogenization device includes at least two such light homogenization components.

[0050] Any one of the first light mixing regions 11 has an input coupling surface 111, and this input coupling surface 111 is a light-transmitting surface, which can specifically be a fully transparent surface or a partially transmitting and partially reflecting surface. The light emitted from the light source can enter the first light mixing region 11 through the input coupling surface 111.

[0051] Any first light mixing area 11 includes a first partially transmissive and partially reflective mirror 112 disposed obliquely, and a first total reflection surface 116 cooperating with the first partially transmissive and partially reflective mirror 112. The first partially transmissive and partially reflective mirror 112 and the first total reflection surface 116 cooperate to transmit part of the light entering the first light mixing area 11 to the corresponding transmission area 21, and to transmit part of the light entering the first light mixing area 11 to other first light mixing areas 11 of the coupling device 1.

[0052] When specifically applying the light homogenizing device, at least two light coupling surfaces 111 of all the first light mixing areas 11 are used to couple in light of different wavelengths. After a certain wavelength of light enters the first light mixing area 11, under the action of the first partially transmissive and partially reflective mirror 112 and the cooperating first total reflection surface 116, part of the light will enter other first light mixing areas 11, so as to be mixed with light of other wavelengths in other first light mixing areas 11, thereby realizing the mixing of light of different wavelengths. For an LED light source with multi-chip packaging, different colors of light emitted by different light-emitting chips can be set to enter different first light mixing areas 11, and then these different colors of light will be mixed in the coupling device 1 under the action of the first partially transmissive and partially reflective mirror 112 and the first total reflection mirror, which helps to alleviate the serious separation problem of the virtual light source array formed by reflection due to the offset of different wavelength light-emitting chips relative to the center position of the light bar, thereby improving the light homogenizing effect of the light homogenizing device under the premise of limited overall length of the light homogenizing device.

[0053] It should be noted that at least two light coupling surfaces 111 being used to couple in light of different wavelengths does not mean that each light coupling surface 111 can only be used to couple in one wavelength of light. In specific implementation, for any light coupling surface 111, this light coupling surface 111 can correspond to only one wavelength of light, or it can be set that two or more wavelengths of light can enter this light coupling surface 111. For example, for a common RGBW (Red, Green, Blue, White) light source, if the light homogenizing device has two first light mixing areas 11, then each light coupling surface 111 can be set to correspond to two colors of light; or if the light homogenizing device has four first light mixing areas 11, each light coupling surface 111 can be set to correspond to one color of light.

[0054] The light entering the first light mixing area 11 is partially mixed with the light of other wavelengths in the adjacent first light mixing area 11, and a part of the light will enter the second light mixing area 31 through the transmission area 21. The second light mixing area 31 includes a second partially transmissive and partially reflective mirror 312 disposed obliquely, and a second total reflection surface 316 cooperating with the partially transmissive and partially reflective mirror. The second partially transmissive and partially reflective mirror 312 cooperates with the first total reflection surface 116 to transmit the light entering the second light mixing area 31 to other second light mixing areas 31 and to the corresponding first light mixing area 11. The light transmitted from the second light mixing area 31 to the corresponding first light mixing area 11 can, under the action of the first partially transmissive and partially reflective mirror 112 and the first total reflection mirror, partially return to the second light mixing area 31, and part of the light can enter other first light mixing areas 11 adjacent to this first light mixing area 11; and the light transmitted from the second light mixing area 31 to the adjacent second light mixing area 31, under the action of the second partially transmissive and partially reflective mirror 312 in the adjacent second light mixing area 31, part of the light returns to the second light mixing area 31 along the original path, and part of the light is transmitted to the first light mixing area 11 corresponding to the adjacent second light mixing area 31.

[0055] For ease of understanding, refer to Figure 2 , Figure 2 which is a schematic diagram of two sets of light homogenizing components arranged in parallel in the embodiment of the present application. Taking the parallel arrangement of two sets of light homogenizing components as an example, Figure 2 the partial light path is schematically shown by a dotted line with an arrow in. After a beam of light enters the first light mixing area 11 from an incident surface 111, part of the light is repeatedly reflected between the two first light mixing areas 11, part of the light is repeatedly reflected between the first light mixing area 11 and the second light mixing area 31, and part of the light is repeatedly reflected between the two second light mixing areas 31, that is, the light will be repeatedly reflected within the same light homogenizing component and will also be repeatedly reflected between the two light homogenizing components. In this way, when different wavelength lights are respectively coupled into the two incident surfaces 111, the two beams of light can be fully mixed between the two sets of light homogenizing components and multiple reflections occur cyclically, so as to achieve the light homogenizing effect. By analogy, when the light homogenizing device includes more light homogenizing components arranged in parallel, the light will be repeatedly reflected in more light homogenizing components, thereby further improving the light homogenizing effect. It should be noted that when the number of light homogenizing components is greater than two, all the light homogenizing components can be arranged side by side in a straight line, or can be arranged in an array in both the horizontal and vertical directions.

[0056] Optionally, when specifically setting a single set of light homogenizing components, the components within the light homogenizing components can be arranged in the order of the first light mixing area 11, the transmission area 21, and the second light mixing area 31. When specifically arranging two or more sets of light homogenizing components, the light homogenizing components can be arranged side by side, that is, all the first light mixing areas 11 are arranged on the same side of the light homogenizing device, all the second light mixing areas 31 are arranged on the opposite side of the light homogenizing device, and at the same time, all the transmission areas 21 are arranged in the middle of the light homogenizing device. Such an arrangement is more conducive to the cooperation between the light homogenizing device and the light emitting chips assembled on the circuit board.

[0057] In all the second light mixing areas 31, at least one second light mixing area 31 has an output surface 311 for coupling out light. That is, for the output device 3 including at least two second light mixing areas 31, the output surface 311 can be provided only in one second light mixing area 31, or can be provided in two or more second light mixing areas 31. Since the light has been fully mixed within the light homogenizing device and has undergone repeated refraction, the light has become uniform on any plane. Therefore, providing the output surface 311 in any second light mixing area 31 can make the output light be uniformly mixed light. In actual implementation, specifically in which second light mixing areas 31 to provide the output surface 311 can be determined according to the actual requirements for light.

[0058] It should be noted that in the embodiments of the present application, the input surface 111 and the output surface 311 are both functional descriptions. When specifically setting the input surface 111 and the output surface 311, the input surface 111 and the output surface 311 should have a light transmissive property to allow light to enter the first light mixing area 11 through the input surface 111 and be coupled out of the second light mixing area 31 through the output surface 311. More specifically, the input surface 111 and the output surface 311 can respectively be a completely transmissive surface, or can also be a partially transmissive and partially reflective surface. It should also be understood that in the embodiments of the present application, the transmission of light between different first light mixing areas 11, the round-trip between the first light mixing area 11 and the second light mixing area 31, and the transmission between different second light mixing areas 31 can all be achieved by providing corresponding light transmissive surfaces in the first light mixing area 11 and the second light mixing area 31.

[0059] When specifically setting the light-coupling surface 111, the light-coupling surface 111 can be disposed opposite to the transmission region 21. In this way, after light enters the first light mixing region 11 through the light-coupling surface 111, part of the light can directly pass through the first partially transmissive and partially reflective mirror 112 and enter the transmission region 21, while the other part of the light can enter the adjacent first light mixing region 11 after being reflected by the first partially transmissive and partially reflective mirror 112 and the first total reflection surface 116; of course, the light-coupling surface 111 can also be disposed opposite to the adjacent first light mixing region 11. In this way, after light enters the first light mixing region 11, part of the light can pass through the first partially transmissive and partially reflective mirror 112 and directly enter the adjacent first light mixing region 11, and the other part of the light can enter the transmission region 21 after being reflected by the first partially transmissive and partially reflective mirror 112 and the first total reflection surface 116. When specifically setting the light-emitting surface 311, the light-emitting surface 311 can be a surface facing the transmission region 21. Since the light has been sufficiently mixed and homogenized in the light homogenizing device, the selection of the light-emitting surface 311 will not affect the final display effect. Of course, in some possible embodiments, the light-emitting surface 311 can also have a certain inclination angle relative to the transmission region 21 or the adjacent first light mixing region 11. In this way, after light enters the first light mixing region 11 through the light-coupling surface 111, it may directly enter the transmission region 21 or the adjacent first light mixing region 11, or may enter the transmission region 21 or the adjacent first light mixing region 11 under the reflection of the total reflection surface.

[0060] In a specific example, the light-coupling surface 111 and the light-emitting surface 311 are respectively disposed opposite to the transmission region 21. With such a setting, when specifically installing the light homogenizing component into the projection optical machine, the positions of the light-emitting chip, the light-coupling surface 111, the light-emitting surface 311, and the light source imaging are arranged on the same straight line, which has the characteristic of simple structure.

[0061] The first light mixing region 11 and the second light mixing region 31 in the embodiments of the present application can be regions surrounded by some lenses, mirrors, etc. When specifically setting the first reflection surface and the first partially transmissive and partially reflective mirror 112 in the first light mixing region 11, the specific setting method should be determined according to the optical path setting. Figure 1 The exemplary light-coupling surface 111 and light-emitting surface 311 are highlighted with gray color blocks in Figure 1 For the four first light mixing regions 11 shown in

[0062] Specifically, the first partial transmission partial reflector 112 and the first reflecting surface need to cooperate with each other to change the propagation direction of part of the light. Therefore, taking the direction from the first light mixing area 11 to the second light mixing area 31 as the reference direction and the plane perpendicular to the reference direction as the reference plane, the first partial transmission partial reflector 112 should be inclined relative to the reference plane at a certain angle, and the first partial transmission partial reflector 112 should be inclined at least towards the direction where one adjacent first light mixing area 11 is located. With this setting, when the coupling surface 111 is arranged opposite to the transmission area 21 or when the coupling surface 111 is arranged opposite to an adjacent first coupling area, the propagation direction of part of the light is changed, so that part of the light enters the transmission area 21 and part of the light enters the adjacent first light mixing area 11. The number of the first total reflection surfaces 116 can be multiple, and the multiple first total reflection surfaces 116 can be respectively arranged on the side of the first partial transmission partial reflector 112 facing away from the transmission area 21 or facing away from the adjacent first light mixing area 11. When the light passes through the first partial transmission partial reflector 112 or is reflected by the first partial transmission partial reflector 112 and propagates in a direction deviating from the first light mixing area 11 or the transmission area 21, the light will irradiate on the first total reflection surface 116, and under the reflection action of the first total reflection surface 116, the light returns to the first partial transmission partial reflector 112, or enters the transmission area 21, or enters the adjacent first light mixing area 11.

[0063] When specifically setting the first partial transmission partial reflector 112 and the second partial transmission partial reflector 312, the number of the first partial transmission partial reflector 112 and the second partial transmission partial reflector 312 can be selected according to the actual optical path requirements. For example, if the coupling device 1 includes three or more first light mixing areas 11 and one first light mixing area 11 is adjacent to two or more first light mixing areas 11, only one first partial transmission partial reflector 112 can be arranged in this first light mixing area 11, and the first partial transmission partial reflector 112 can be inclined only towards one adjacent first light mixing area 11 or towards two adjacent first light mixing areas 11; alternatively, two first partial transmission partial reflectors 112 can be arranged in this first light mixing area 11, and the two first partial transmission partial reflectors 112 can be respectively inclined towards different adjacent first light mixing areas 11.

[0064] The working principle of the second partial transmission partial reflector 312 and the second total reflection surface 316 is the same as that of the first partial transmission partial reflecting surface and the first total reflection surface 116. Therefore, the setting method of the second partial transmission partial reflector 312 and the second total reflection surface 316 can refer to the description of the setting method of the first partial transmission partial reflecting surface and the first total reflection surface 116 above, and will not be elaborated here.

[0065] Optionally, the transmittance of the first partial transmission and partial reflection mirror 112 can be set to 50%, so as to bisect the light passing through the first partial transmission and partial reflection mirror 112, which is beneficial to the uniform mixing of light in the light homogenizing device; similarly, the transmittance of the second partial transmission and partial reflection mirror 312 can be set to 50%, which is also beneficial to the uniform mixing of light in the light homogenizing device.

[0066] In the above technical solution, light rays of different wavelengths can enter different light mixing regions of the light homogenizing device from different light coupling surfaces 111, and under the action of the first partial transmission and partial reflection mirror 112 and the first total reflection surface 116, part of the light rays can enter another light mixing region from one first light mixing region 11 to achieve light mixing. Another part of the light rays can reach the second light mixing region 31 through the transmission region 21. Under the action of the second partial transmission and partial reflection mirror 312 and the second total reflection surface 316, part of the light rays entering the second light mixing region 31 can be transmitted to the adjacent second light mixing region 31, and under the action of the second partial transmission and partial reflection mirror 312 and the second total reflection surface 316 in the adjacent second light mixing region 31, part of the light rays can reach the corresponding first light mixing region 11 from the adjacent second light mixing region 31 through the corresponding transmission region 21, so that the light rays are circularly reflected between the first light mixing region 11 and the second light mixing region 31, increasing the number of reflections of the light rays in the light homogenizing device, thereby improving the light homogenizing effect of the light homogenizing device.

[0067] Refer to Figure 3 and Figure 4 , Figure 3 which is an exemplary view of the first light mixing region in an embodiment of the present application; Figure 4 which is an exemplary exploded view of the first light mixing region in an embodiment of the present application.

[0068] In a possible implementation manner, when specifically setting the first light mixing region 11, each first light mixing region 11 includes a light coupling cavity 113 surrounded by multiple side surfaces, and the first partial transmission and partial reflection mirror 112 is disposed in the light coupling cavity 113. The light emitted by the light source enters the first light mixing region 11 through the light coupling surface 111, which is essentially entering the light coupling cavity 113. Among the multiple side surfaces surrounding the light coupling cavity 113, there are the light coupling surface 111 for light to be coupled into the first light mixing region 11, and the light transmitting surfaces for light to enter the transmission region 21 and the adjacent first light mixing region 11 from the light coupling cavity 113, and there is also the first total reflection surface 116 that cooperates with the first partial transmission and partial reflection mirror 112.

[0069] Specifically, among the multiple side surfaces surrounding the light coupling cavity 113, the side surface opposite to the light coupling cavity 113 of the adjacent first light mixing region 11 is the first light transmitting surface 114, and the side surface opposite to the corresponding transmission region 21 is the second light transmitting surface 115; among the other side surfaces except the first light transmitting surface 114 and the second light transmitting surface 115, one side surface is the light coupling surface 111, and the remaining side surfaces are all the first total reflection surfaces 116.

[0070] After the light enters any one of the light coupling cavities 113 from the light coupling surface 111, under the action of the first partial transmission and partial reflection mirror 112 and the first total reflection surface 116, part of the light enters the adjacent light coupling cavity 113 through the first light transmission surface 114, and part of the light enters the opposite transmission area 21 through the second light transmission surface 115.

[0071] The light propagating in the direction of the adjacent first light mixing area 11 in a first light mixing area 11, after passing through the first light transmission surface 114 of the first light mixing area 11, reaches the first light transmission surface 114 of the adjacent first light mixing area 11, and then reaches the light coupling cavity 113 of the adjacent first light mixing area 11. It should be understood that when a certain first light mixing area 11 is adjacent to two or more first light mixing areas 11, the light in the first light mixing area 11 needs to enter two or more adjacent first light mixing areas 11 respectively, and two or more first light transmission surfaces 114 can be correspondingly arranged.

[0072] The first light mixing area 11 is arranged in this way. The light coupling cavity 113 is directly formed by using the first light transmission surface, the second light transmission surface 115, the light coupling surface 111 and the total reflection surface, so that the structure of the light coupling device 1 is simple, and thus the assembly space can be saved; in addition, the other sides of the light coupling cavity 113 except the first light transmission surface 114, the second light transmission surface 115 and the light coupling surface 111 are all arranged as total reflection surfaces. On the one hand, the number of reflections of the light can be increased, the light homogenization effect of the light homogenizing device can be improved, and the light loss can also be reduced, which is beneficial to improving the final display effect of the light.

[0073] Refer to together Figure 5 and Figure 6 , Figure 5 is an exemplary view of the second light mixing area in the embodiment of the present application, Figure 6 An exemplary exploded view of the second light mixing area in the embodiment of the present application.

[0074] As an optional implementation manner, similar to the first light mixing area 11, each second light mixing area 31 includes a light coupling cavity 313 surrounded by a plurality of side surfaces, and a second partial transmission and partial reflection mirror 312 is arranged in the light coupling cavity 313. When the light enters the second light mixing area 31, it means that the light enters the light coupling cavity 313 of the second light mixing area 31. Among the plurality of side surfaces surrounding the light coupling cavity 313, there are a light coupling surface 311 for the light to be coupled out of the second light mixing area 31, a light transmission surface for the light to enter the light coupling cavity 313 from the transmission area 21 and the adjacent second light mixing area 31, and a second total reflection surface 316 that cooperates with the second partial transmission and partial reflection mirror 312.

[0075] The side surface opposite to the light coupling cavity 313 of the adjacent second light mixing area 31 among the plurality of side surfaces is the third light transmission surface 314, and the side surface opposite to the corresponding transmission area 21 among the plurality of side surfaces is the fourth light transmission surface 315.

[0076] Among the other side surfaces except the third light-transmitting surface 314 and the fourth light-transmitting surface 315: If the second light mixing region 31 includes the light coupling surface 311, one side surface is the light coupling surface 311, and the remaining side surfaces are the second total reflection surfaces 316; if the second light mixing region 31 does not include the light coupling surface 311, the remaining side surfaces are all the second total reflection surfaces 316.

[0077] After the light enters any one of the light coupling cavities 113 from the light coupling surface 111, under the action of the second partially transmitting and partially reflecting mirror 312 and the second total reflection surface 316, part of the light enters the adjacent light coupling cavity 313 through the third light-transmitting surface 314, and part of the light enters the opposite transmission region 21 through the fourth light-transmitting surface 315.

[0078] Similar to the setting principle of the first light-transmitting surface 114, for any one of the second light mixing regions 31, according to the number and arrangement of the second light mixing regions 31, the number of the third light-transmitting surfaces 314 can also be one, two or more.

[0079] The second light mixing region 31 is set in this way, and the light coupling cavity 113 is directly enclosed by the third light-transmitting surface 314, the fourth light-transmitting surface 315, the light coupling surface 111 and the total reflection surface, so that the structure of the light coupling device 1 is simple, and thus the assembly space can be saved; in addition, the other side surfaces of the light coupling cavity 113 except the first light-transmitting surface 114, the second light-transmitting surface 115 and the light coupling surface 111 are all set as total reflection surfaces. On the one hand, the number of reflections of the light can be increased, the light homogenizing effect of the light homogenizing device can be improved, and the light loss can also be reduced, which is beneficial to improving the final display effect of the light.

[0080] As an optional implementation manner, when specifically setting the light coupling surface 311, the light coupling surface 311 is a partially transmitting and partially reflecting surface. By setting the light coupling surface 311 as a partially transmitting and partially reflecting surface, when the light irradiates the light coupling surface 311, part of the light passes through the light coupling surface 311 to form an image, and the other part of the light can be reflected from the light coupling surface 311 and return to the light coupling cavity 113 to enter the cycle of repeated reflections, thereby increasing the number of repeated reflections of the light and improving the light homogenizing effect.

[0081] Optionally, the transmittance of the light coupling surface 311 can be set to be between 20% and 40%, specifically, it can be 20%, 25%, 30%, 35%, 40%, etc. By setting the transmittance of the light coupling surface 311 within the above range, on the one hand, it can ensure that enough light is reflected back to the light coupling cavity 313 after reaching the light coupling surface 311, thereby improving the light homogenizing effect; on the other hand, it can reduce the risk of problems such as low imaging brightness and large imaging delay caused by too low transmittance.

[0082] Refer to Figure 7 , Figure 7 which is an exemplary diagram of the transmission region in the embodiment of the present application.

[0083] As an alternative implementation, when specifically setting the transmission device 2, at least part of the side surface of each transmission area 21 is a third total reflection surface 211. The transmission area 21 is arranged between the first light mixing area 11 and the second light mixing area 31, and can specifically be in a cylindrical shape. The two end faces of the cylindrical transmission area 21 respectively correspond to the second light transmission surface 115 and the fourth light transmission surface 315. Therefore, the two end faces of the transmission area 21 should be light transmission surfaces. The third total reflection surface 211 is used as at least part of the side surface of the transmission area 21, that is, the third total reflection surface 211 can be used as the entire side surface of the transmission area 21, or the third total reflection surface 211 can also be used as part of the side surface of the transmission area 21.

[0084] According to the requirements of the optical path setting, the number of the third total reflection surfaces 211 can also be one, two or more. For the transmission device 2, the number of the transmission areas 21 is relative to the number of the first light mixing areas 11 and the second light mixing areas 31, and the number of the first light mixing areas 11 is two or more, and correspondingly the number of the transmission areas 21 is also two or more. If the mutually opposite side surfaces of two adjacent transmission areas 21 are set as light transmission surfaces, after the light enters the transmission area 21, it can also enter the adjacent transmission area 21 from one transmission area 21, thereby further improving the mixing uniformity of the light. When setting the side surface of the transmission area 21 opposite to the adjacent transmission area 21 as a light transmission surface, the third total reflection surface 211 can be used as the other side surface of the transmission area 21.

[0085] By setting the third total reflection surface 211, the number of reflections of the light in the transmission area 21 can be increased, thereby improving the light homogenization effect of the light homogenization device.

[0086] As an alternative implementation, in the transmission device 2 of the embodiment of the present application, at least two adjacent transmission areas 21 are in mutual abutment, and the mutually abutting side surfaces of the two adjacent transmission areas 21 are partially transmissive and partially reflective surfaces. With such a setting, when the light irradiates on the partially transmissive and partially reflective surface of the transmission area 21, part of the light can enter the adjacent transmission area 21 and be mixed with the light located in the adjacent transmission area 21, improving the mixing effect of the light; part of the light will be reflected back into the transmission area 21, increasing the number of reflections of the light, thereby improving the uniform effect of the light. In addition, setting two adjacent transmission areas 21 in mutual abutment makes the structure of the light homogenization device compact and can save the assembly space.

[0087] Certainly, in some possible implementation manners, there may also be a certain interval between the adjacent transmission areas 21. When there is a certain interval between the adjacent transmission areas 21, the entire side surface of the transmission area 21 can be set as the third total reflection surface 211 to reduce the risk of light leakage of the transmission device 2 of the light homogenization device.

[0088] As an alternative implementation, when specifically setting the transmission device 2, the transmission device 2 further includes a diffusing mirror for diffusing light. Specifically, the diffusing mirror can be disposed on the light propagation path inside the transmission area 21 or on the side surface of the transmission area 21 opposite to the adjacent transmission area 21. By providing the diffusing mirror, the light in the transmission area 21 can be made more dispersed, so that the light is more easily irradiated onto the third total reflection surface 211 on the side of the transmission area 21, thereby increasing the number of reflections and enhancing the light homogenization effect of the light homogenizing device.

[0089] Refer to together Figure 8 , Figure 8 is the optical path schematic diagram in the embodiment of the present application.

[0090] As an alternative implementation, in the embodiment of the present application, the coupling-in device 1 includes four first light mixing areas 11, and the four first light mixing areas 11 are arranged in a "field" shape. Each first light mixing area 11 includes two first partially transmissive and partially reflective mirrors 112, the two first partially transmissive and partially reflective mirrors 112 are arranged crosswise, and the two first partially transmissive and partially reflective mirrors 112 are respectively inclined towards two adjacent first light mixing areas 11. From the above description of the first partially transmissive and partially reflective mirror 112, it can be seen that if the first partially transmissive and partially reflective mirror 112 is inclined towards an adjacent first light mixing area 11, the first partially transmissive and partially reflective mirror 112 can transmit light to the transmission area 21 and the adjacent first light mixing area 11 respectively. Therefore, the two first partially transmissive and partially reflective mirrors 112 are used to transmit the light entering the first light mixing area 11 to two adjacent first light mixing areas 11 and transmit it to the corresponding second light mixing area 31 through the transmission area 21.

[0091] The light passing through the two first partially transmissive and partially reflective mirrors 112 described above can be the light directly from the light coupling surface 111, the light reflected by the first total reflection surface 116, or the light from the first light transmissive surface 114 or the second light transmissive surface 115. Therefore, when the light passes through the two first partially transmissive and partially reflective mirrors 112 during the process of advancing towards the transmission area 21, the two first partially transmissive and partially reflective mirrors 112 can transmit the light to the transmission area 21 and two adjacent first light mixing areas 11 respectively. And the optical path is reversible, so when the light passes through the two first partially transmissive and partially reflective mirrors 112 in other directions, the light will also be transmitted in different directions. For example, when the light passes through the two first partially transmissive and partially reflective mirrors 112 in the direction away from the transmission area 21, part of the light will be transmitted towards an adjacent first light mixing area 11, part of the light will be transmitted towards another adjacent first light mixing area 11, and part of the light will continue to be transmitted in the direction away from the transmission area 21.

[0092] The four first light mixing areas 11 are arranged in a "field" shape, which means that the four first light mixing areas 11 are arranged in two rows and two columns. Such an arrangement makes the light homogenizing components in the light homogenizing device arranged compactly on the one hand. On the other hand, as Figure 8 shown, two first partially transmissive and partially reflective mirrors 112 are arranged in each first light mixing area 11, which can make the light form two cycles in the light homogenizing device. One cycle is the cycle of the light between the four first light mixing areas 11, that is, Figure 8 the A cycle in Figure 8 , and the other cycle is the cycle of the light between a group of two adjacent light homogenizing components, that is,

[0093] the B cycle in Figure 3 . These two cycle optical paths can increase the number of reflections of the light in a limited space, thereby improving the light homogenizing effect of the light homogenizing device.

[0094] As an alternative embodiment, each second light mixing area 31 includes two second partially transmissive and partially reflective mirrors 312, and the two second partially transmissive and partially reflective mirrors 312 are respectively inclined at an angle towards two adjacent second light mixing areas. As described above for the first partially transmissive and partially reflective mirror 112, if the second partially transmissive and partially reflective mirror 312 is inclined at an angle towards an adjacent second light mixing area 31, then after the light entering the second light mixing area 31 from the transmission area 21 passes through the two second partially transmissive and partially reflective mirrors 312, part of the light enters an adjacent second light mixing area 31, part of the light enters another adjacent second light mixing area 31, and part of the light will continue to advance along the direction of the transmission area 21 pointing to the second light mixing area 31. The light advancing along the direction of the transmission area 21 pointing to the second light mixing area 31 may reach the second total reflection surface 316 and be reflected back into the second light mixing area 31, or may reach the coupling surface 311 and be coupled out of the second light mixing area 31.

[0095] It should be understood that the light entering the second light mixing area 31 described above can be the light from the transmission area 21, the light reflected by the second total reflection surface 316, or the light from the third light transmission surface 314 or the fourth light transmission surface 315. The light from the third light transmission surface 314 or the fourth light transmission surface 315 is the light from an adjacent second light mixing area 31. When these lights pass through the two second partial transmission and partial reflection mirrors 312, part of the light will be transmitted to another adjacent second light mixing area 31, part of the light will enter the transmission area 21 and finally reach the first light mixing area 11, and still part of the light will propagate along the direction of the transmission area 21 pointing to the second light mixing area 31 and finally reach the second total reflection surface 316 or the coupling-out surface 311.

[0096] By arranging two second partial transmission and partial reflection mirrors 312 in the second light mixing area 31 as described above, a circular light path can be formed among the four second light mixing areas 31, that is, the C cycle as shown in Figure 8 Furthermore, a circular light path can be formed between two adjacent light homogenizing components in different B cycles, that is, the D cycle as shown in Figure 8 By forming the C cycle and the D cycle, the number of reflections of the light can be further increased, thereby further improving the light homogenizing effect of the light homogenizing device.

[0097] For the coupling-in device 1 including four first light mixing areas 11, if the four transmission devices 2 are adjacent to each other two by two and are in contact with each other, and the contacting surfaces of the two adjacent transmission devices 2 are light transmission surfaces: simultaneously arranging first partial transmission and partial reflection mirrors 112 inclined towards two adjacent first light mixing areas 11 in the first light mixing area 11 and second partial transmission and partial reflection mirrors 312 inclined towards two adjacent second light mixing areas 31 in the second light mixing area 31 respectively, in addition to realizing the above four circular light paths A, B, C, and D in the light homogenizing device, the light can also form a light path cycle between two adjacent first light mixing areas 11 and the second light mixing areas 31 corresponding to the other two first light mixing areas 11. In this way, more loops of circular reflection of the light can be formed in the light homogenizing device, thereby further increasing the number of light reflections and improving the light homogenizing effect of the light homogenizing device.

[0098] Optionally, when each second light mixing area 31 includes a coupling-out cavity 313 surrounded by multiple side surfaces, the coupling-out cavity 313 is in the shape of a quadrangular prism, and the two second partial transmission and partial reflection mirrors 312 are respectively arranged along two diagonal sections of the coupling-out cavity 313. Similarly, the coupling-out cavity 313 is only one cavity, and the quadrangular prism shape is only used to describe the shape of the cavity. The advantages of arranging the second partial transmission and partial reflection mirrors 312 in this way can refer to the description of the first partial transmission and partial reflection mirrors 112 above, which will not be elaborated here.

[0099] In some possible embodiments, the number of the first partially transmissive and partially reflective mirrors 112 in the first light mixing region 11 may be three, and the three first partially transmissive and partially reflective mirrors 112 are respectively arranged along three diagonal cutting planes of the coupling cavity 113; and the number of the second partially transmissive and partially reflective mirrors 312 in the second light mixing region 31 may also be three, and the three second partially transmissive and partially reflective mirrors 312 are arranged along three diagonal cutting planes of the decoupling cavity 313, so as to further increase the number of reflections of light and improve the light homogenizing effect of the light homogenizing device.

[0100] When specifically arranging the first partially transmissive and partially reflective mirror 112 and the second partially transmissive and partially reflective mirror 312, the first partially transmissive and partially reflective mirror 112 and the second partially transmissive and partially reflective mirror 312 can be set as semi-transmissive and semi-reflective mirrors, so that the light passing through the first partially transmissive and partially reflective mirror 112 and the second partially transmissive and partially reflective mirror 312 will be evenly distributed in different directions, improving the uniformity of light mixing.

[0101] The embodiment of the present application further provides a projection optical machine, which includes any one of the above light homogenizing devices, and the light homogenizing device is arranged in the optical path of the projection optical machine.

[0102] For the light homogenizing device used in the above projection optical machine, light of different wavelengths can enter different light mixing regions of the light homogenizing device from different coupling surfaces 111, and under the action of the first partially transmissive and partially reflective mirror 112 and the first total reflection surface 116, part of the light can enter another light mixing region from one first light mixing region 11 to realize light mixing, and another part of the light can reach the second light mixing region 31 through the transmission region 21. Under the action of the second partially transmissive and partially reflective mirror 312 and the second total reflection surface 316, part of the light entering the second light mixing region 31 can be transmitted to the adjacent second light mixing region 31, and under the action of the second partially transmissive and partially reflective mirror 312 and the second total reflection surface 316 in the adjacent second light mixing region 31, part of the light can reach the corresponding first light mixing region 11 from the adjacent second light mixing region 31 through the corresponding transmission region 21, so that the light is cyclically reflected between the first light mixing region 11 and the second light mixing region 31, increasing the number of reflections of the light in the light homogenizing device, and thus improving the light homogenizing effect of the light homogenizing device.

[0103] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification shall be included within the protection scope of this disclosure.

[0104] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A light homogenizing device, characterized in that: include: A coupling device, a transmission device and a coupling device are arranged opposite to each other; wherein: The coupling device has at least two first light mixing areas, the coupling device has a second light mixing area corresponding to each of the first light mixing areas, and each of the first light mixing areas has a coupling surface for coupling light, and at least two of the coupling surfaces are respectively used to couple light of different wavelengths; The transmission device comprises a transmission area arranged between each of the first light mixing area and the second light mixing area, and the transmission area is used for allowing light to travel back and forth between the first light mixing area and the second light mixing area; Any of the first light-mixing areas comprises an inclined first partially transmissive and partially reflective mirror and a first total reflection surface cooperating with the first partially transmissive and partially reflective mirror, and is used to transmit the light entering the first light-mixing area to other first light-mixing areas and to the corresponding second light-mixing area through the transmission area; Any of the second light-mixing areas comprises an inclined second partially transmissive partial reflector and a second total reflection surface cooperating with the second partially transmissive partial reflector, and is used to transmit the received light to other second light-mixing areas and to the corresponding first light-mixing area through the transmission area; At least one of the second light mixing regions has an outcoupling surface for outcoupling light.

2. The light homogenizing device according to claim 1, characterized in that: Each of the first light mixing regions comprises an incoupling cavity surrounded by a plurality of side surfaces, and the first partially transmissive and partially reflective mirror is disposed in the incoupling cavity; The side surface of the plurality of side surfaces opposite to the coupling cavity of the adjacent first light mixing area is a first light-transmitting surface, and the side surface of the plurality of side surfaces opposite to the corresponding transmission area is a second light-transmitting surface; among the other side surfaces except the first light-transmitting surface and the second light-transmitting surface, one side surface is a coupling surface, and the other side surfaces are first total reflection surfaces; After the light enters any of the coupling cavities from the coupling surface, under the action of the first partially transmitting and partially reflecting mirror and the first total reflection surface, part of the light enters the adjacent coupling cavity through the first light-transmitting surface, and part of the light enters the opposite transmission area through the second light-transmitting surface.

3. The light homogenizing device according to claim 2, characterized in that: Each of the second light mixing regions comprises an outcoupling cavity surrounded by a plurality of side surfaces, and the second partially transmissive and partially reflective mirror is disposed in the outcoupling cavity; The side surface of the plurality of side surfaces opposite to the outcoupling cavity of the adjacent second light mixing area is a third light-transmitting surface, and the side surface of the plurality of side surfaces opposite to the corresponding transmission area is a fourth light-transmitting surface; Among the other side surfaces except the third light-transmitting surface and the fourth light-transmitting surface: if the second light-mixing area includes an out-coupling surface, one side surface is an out-coupling surface, and the other side surfaces are second total reflection surfaces; if the second light-mixing area does not include an out-coupling surface, the other side surfaces are second total reflection surfaces After the light enters any of the coupling-in cavities from the coupling-in surface, under the action of the second partially transmitting partial reflecting mirror and the second total reflecting surface, part of the light enters the adjacent coupling-out cavity through the third light-transmitting surface, and part of the light enters the opposite transmission area through the fourth light-transmitting surface.

4. The light homogenizing device according to claim 1, characterized in that: The outcoupling surface is a partially transmissive and partially reflective surface.

5. The light homogenizing device according to claim 1, characterized in that: At least part of the side surface of each transmission area is a third total reflection surface.

6. The light homogenizing device according to claim 5, characterized in that: At least two adjacent ones of the said transmission areas are in contact with each other, and the sides of two adjacent ones of the said transmission areas in contact with each other are partially transmissive and partially reflective surfaces.

7. The light homogenizing device according to claim 5, characterized in that: The said transmission device further includes a diffusing mirror; The said diffusing mirror is arranged in the said transmission area and is used for diffusing light.

8. The light homogenizing device according to any one of claims 1 to 7, characterized in that: The said light coupling-in device includes four first light mixing areas, and the four said first light mixing areas are arranged in a "field" shape; Each of the said first light mixing areas includes two first partially transmissive and partially reflective mirrors, the two said first partially transmissive and partially reflective mirrors are arranged crosswise, and the two said first partially transmissive and partially reflective mirrors are respectively inclined towards two adjacent first light mixing areas; The two said first partially transmissive and partially reflective mirrors are used for propagating the light entering the said first light mixing area to two adjacent ones of the said first light mixing areas and transmitting it to the corresponding second light mixing area through the said transmission area.

9. The light homogenizing device according to claim 8, characterized in that: When each of the said first light mixing areas includes a light coupling-in cavity surrounded by multiple sides, the said light coupling-in cavity is a quadrangular prism shape, and the two said first partially transmissive and partially reflective mirrors are respectively arranged along two diagonal sections of the said light coupling-in cavity.

10. The light homogenizing device according to claim 8, characterized in that: Each of the said second light mixing areas includes two second partially transmissive and partially reflective mirrors, and the two said second partially transmissive and partially reflective mirrors are respectively inclined towards two adjacent ones of the first light mixing areas; The two said second partially transmissive and partially reflective mirrors are used for propagating the received light to two adjacent ones of the said second light mixing areas and transmitting it to the corresponding first light mixing area through the said transmission area.

11. The light homogenizing device according to claim 10, characterized in that: When each of the said second light mixing areas includes a light coupling-out cavity surrounded by multiple sides, the said light coupling-out cavity is a quadrangular prism shape, and the two said second partially transmissive and partially reflective mirrors are respectively arranged along two diagonal sections of the said light coupling-out cavity.

12. A projection optical machine, characterized in that: Comprising a light homogenizing device according to any one of claims 1 to 11, the said light homogenizing device is arranged in the optical path of the said projection optical machine.

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