CN120161663A - A light homogenizing device and a projection optical machine - Google Patents

Abstract

The application provides a light homogenizing device and a projection optical machine, wherein the light homogenizing device comprises at least two first light mixing areas and second light mixing areas corresponding to each first light mixing area, any one first light mixing area comprises a first partial transmission partial reflector obliquely arranged and a first total reflection surface matched with the first partial transmission partial reflector and is used for transmitting light entering the first light mixing area to other first light mixing areas and transmitting the light to the corresponding second light mixing areas through a transmission area, and any one second light mixing area comprises a second partial transmission partial reflector obliquely arranged and a second total reflection surface matched with the second partial transmission partial reflector and is used for transmitting received light to other second light mixing areas and transmitting the received light to the corresponding first light mixing areas through the transmission area. According to the light homogenizing device, light rays with different wavelengths can enter different first light mixing areas and are mixed and circularly reflected in the light homogenizing device, so that the light homogenizing effect of the light homogenizing device can be improved.

Description

Dodging device and projection ray apparatus

Technical Field

The present application relates to the field of optical technologies, and in particular, to a light homogenizing device and a projection optical machine.

Background

With the development of augmented reality technology, dodging technology is largely applied to display modules of augmented reality devices. The common light homogenizing device mainly adopts a light rod as a core component. The light bar reflects light for multiple times through the internal special structure, so that the light is uniformly distributed.

The light rod light uniformity in the prior art is related to glass materials, the length and the end face size, the length of the light rod is increased, and the light rod light uniformity can be improved. However, most of the augmented reality devices are miniaturized devices, and the length of the light rod is limited in a limited space, so that the light homogenizing effect of the light homogenizing device is difficult to improve.

Disclosure of Invention

The application provides a light homogenizing device and a projection light machine, which aim to improve the light homogenizing effect of the light homogenizing device.

In a first aspect, the present application provides a light homogenizing device, which includes a coupling-in device, a transmission device, and a coupling-out device disposed opposite to each other, wherein:

The coupling-in device is provided with at least two first light mixing areas, the coupling-out device is provided with a second light mixing area corresponding to each first light mixing area, each first light mixing area is provided with a coupling-in surface for coupling in light rays, and the at least two coupling-in surfaces are respectively used for coupling in light rays with different wavelengths;

The transmission device is provided with a transmission area arranged between each first light mixing area and each second light mixing area, and the transmission area is used for allowing light to pass back and forth between the first light mixing area and the second light mixing area;

Any one of the first light mixing areas comprises a first partial transmission partial reflector which is obliquely arranged and a first total reflection surface which is matched with the first partial transmission partial reflector, and 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 one of the second light mixing areas comprises a second partial transmission partial reflector which is obliquely arranged and a second total reflection surface which is matched with the second partial transmission partial reflector, and is used for transmitting received light to other second light mixing areas and transmitting the received light to the corresponding first light mixing areas through the transmission areas;

At least one of the second light mixing regions has a coupling-out surface for coupling out light.

In the above technical scheme, light rays with different wavelengths can enter different light mixing areas of the light evening device from different coupling-in surfaces, and under the action of the first partial transmission partial reflector and the first total reflection surface, part of light rays can enter another light mixing area from one first light mixing area to realize light ray mixing, and the other part of light rays can reach the second light mixing area through the transmission area, under the action of the second partial transmission partial reflector and the second total reflection surface, part of light rays entering the second light mixing area can be transmitted to the adjacent second light mixing area, and under the action of the second partial transmission partial reflector and the second total reflection surface of the adjacent second light mixing area, part of light rays can reach the corresponding first light mixing area through the corresponding transmission area from the adjacent second light mixing area, so that the light rays are circularly reflected between the first light mixing area and the second light mixing area, the reflection times of the light rays in the light evening device are improved, and the light evening effect of the light evening device is improved.

In a possible implementation manner, each first light mixing region comprises a coupling-in cavity surrounded by a plurality of side surfaces, and the first partially-transmitting partially-reflecting mirror is arranged in the coupling-in cavity;

The side surface of the plurality of side surfaces, which is opposite to the coupling-in cavity of the adjacent first light mixing area, is a first light transmission surface, the side surface of the plurality of side surfaces, which is opposite to the corresponding transmission area, is a second light transmission surface;

After light enters any coupling-in cavity from the coupling-in surface, under the action of the first partial transmission partial reflector and the first total reflection surface, part of the light enters the adjacent coupling-in cavity through the first light transmission surface, and part of the light enters the opposite transmission area through the second light transmission surface.

In a possible implementation manner, each second light mixing region comprises a coupling-out cavity surrounded by a plurality of sides, and the second partially-transmitting partially-reflecting mirror is arranged in the coupling-out cavity;

The side surface, opposite to the coupling-out cavity of the adjacent second light mixing region, of the plurality of side surfaces is a third light transmission surface, and the side surface, opposite to the corresponding transmission region, of the plurality of side surfaces is a fourth light transmission surface;

The other side surfaces except the third light-transmitting surface and the fourth light-transmitting surface are respectively a coupling surface and a second total reflection surface if the second light-mixing region comprises the coupling surface, and a second total reflection surface if the second light-mixing region does not comprise the coupling surface

After light enters any coupling-in cavity from the coupling-in surface, under the action of the second partial transmission partial reflector and the second total reflection surface, part of the light enters an adjacent coupling-out cavity through the third light transmission surface, and part of the light enters an opposite transmission area through the fourth light transmission surface.

In one possible embodiment, the coupling-out surface is a partially transmissive and partially reflective surface.

In one possible embodiment, at least part of the lateral surface of each transmission region is a third total reflection surface.

In one possible embodiment, at least two adjacent transmission areas abut against each other, and the side of the two adjacent transmission areas abutting against each other is a partially transmissive and partially reflective surface.

In one possible embodiment, the transmission device further comprises a diffusing mirror;

the diffusion mirror is arranged in the transmission area and used for diffusing light.

In a possible implementation manner, the coupling-in device comprises four first light mixing areas, and the four first light mixing areas are arranged in a shape of a Chinese character 'tian';

Each first light mixing region comprises two first partial transmission partial reflectors which are arranged in a crossing way, and the two first partial transmission partial reflectors incline towards two adjacent first light mixing regions respectively;

the two first partial transmission partial reflectors are used for transmitting the light entering the first light mixing areas to two adjacent first light mixing areas and transmitting the light to the corresponding second light mixing areas through the transmission areas.

In one possible implementation manner, when each first light mixing region includes a coupling-in cavity surrounded by a plurality of sides, the coupling-in cavity is in a quadrangular prism shape, and two first partially-transmitting partially-reflecting mirrors are respectively arranged along two diagonal sections of the coupling-in cavity.

In one possible embodiment, each of the second light mixing regions includes two second partially transmissive partial reflectors, and the two second partially transmissive partial reflectors are respectively inclined toward two adjacent second light mixing regions;

the two second partially transmitting partially reflecting mirrors are used for transmitting the received light rays to two adjacent second light mixing areas and transmitting the received light rays to the corresponding first light mixing areas through the transmission areas.

In one possible implementation manner, when each of the second light mixing regions includes an outcoupling cavity surrounded by a plurality of sides, the outcoupling cavity is in a quadrangular prism shape, and two second partially-transmitting partially-reflecting mirrors are respectively disposed along two diagonal sections of the outcoupling cavity.

In a second aspect, the present application provides a projection light engine, which includes any one of the above light evening devices, where the light evening device is disposed in an optical path of the projection light engine.

According to the light homogenizing device used by the projection light machine, light rays with different wavelengths can enter different light mixing areas of the light homogenizing device from different coupling-in surfaces, part of the light rays can enter another light mixing area from one first light mixing area under the action of the first partial transmission partial reflector and the first total reflection surface to achieve light ray mixing, the other part of the light rays can reach the second light mixing area through the transmission area, part of the light rays entering the second light mixing area can be transmitted to the adjacent second light mixing area under the action of the second partial transmission partial reflector and the second total reflection surface of the adjacent second light mixing area, and part of the light rays can reach the corresponding first light mixing area from the adjacent second light mixing area through the corresponding transmission area, so that the light rays are circularly reflected between the first light mixing area and the second light mixing area, the reflection times of the light rays in the light homogenizing device are improved, and the light homogenizing effect of the light homogenizing device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the embodiments are briefly described below, which are incorporated in and constitute a part of the specification, these drawings showing embodiments consistent with the present disclosure and together with the description serve to illustrate the technical solutions of the present disclosure. It is to be understood that the following drawings illustrate only certain embodiments of the present disclosure and are therefore not to be considered limiting of its scope, for the person of ordinary skill in the art may admit to other equally relevant drawings without inventive effort.

FIG. 1 is a schematic view of an embodiment of a light homogenizing device;

FIG. 2 is a schematic diagram showing two sets of light homogenizing components arranged in parallel in an embodiment of the present application;

FIG. 3 is a diagram illustrating an example of a first light mixing region according to an embodiment of the present application;

FIG. 4 is an exploded view of an example of a first light mixing section in an embodiment of the application;

FIG. 5 is a diagram illustrating an example of a second light mixing region according to an embodiment of the present application;

FIG. 6 is an exploded view of an example of a second light mixing section in an embodiment of the application;

FIG. 7 is a diagram illustrating an example of a transmission area according to an embodiment of the present application;

Fig. 8 is a schematic view of an optical path in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings.

It is noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present disclosure should be taken in a general sense as understood by one of ordinary skill in the art to which the present disclosure pertains. The use of the terms "first," "second," and the like in one or more embodiments of the present description does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

In order to facilitate understanding of the light homogenizing device and the projection light machine provided by the embodiments of the present application, an application scene of the light homogenizing device is described first, and the light homogenizing device provided by the embodiments of the present application may be mounted on the projection light machine, where the light homogenizing device may uniformly distribute input light, so that output light has uniform brightness and color in a specific area, which is particularly important for display devices, and may avoid problems such as uneven brightness, color difference, etc.

With the development of augmented reality technology, dodging technology is largely applied to display modules of augmented reality devices. The common light homogenizing device mainly adopts a light rod as a core component. The light bar reflects light for many times through the internal special structure, and each time the light is reflected, a virtual light source is generated, and when the light is coupled out of the light bar through the many times of reflection, the light bar can be regarded as the common light emission of all virtual light sources, so that the light homogenizing effect is achieved, and the uniform distribution of the light is realized.

The light rod uniformity in the prior art is related to glass material, length and end face size. The length of the light bar is increased, so that the reflection times of light rays in the light bar can be increased, and the light uniformity of the light bar can be improved. However, most of the augmented reality (AR, augmented Reality) devices are miniaturized devices, and particularly, many wearable devices are not lacking, which will limit the space for installing the light uniformizing device, thereby resulting in a limited length of the light rod, resulting in difficulty in improving the light uniformizing effect of the light uniformizing device, which will affect the display effect of the device. Especially for the multi-chip packaged LED light source, the light emitting chips with different wavelengths are offset relative to the center position of the light bar, and the virtual light source array formed by reflection is seriously separated, so that the light homogenizing effect of the light homogenizing device is more required to be improved so as to ensure the display quality of the equipment.

Based on the above, the application provides a light homogenizing device, which aims to improve the light homogenizing effect of the light homogenizing device. The application provides a light homogenizing device which is specifically described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is an overall schematic diagram of a light homogenizing device in an embodiment of the application. The light homogenizing device provided by the embodiment of the application comprises the coupling-in device 1, the transmission device 2 and the coupling-out device 3, wherein light can enter the light homogenizing device through the coupling-in device 1 and then reach the coupling-out device 3 through the transmission device 2, the light is reflected for multiple times in the coupling-in device 1, the transmission device 2 and the coupling-out device 3 to achieve the light homogenizing effect, and finally the homogenized light can be coupled out from the coupling-out device 3.

The coupling-in device 1 has at least two first light-mixing zones 11, the coupling-out device 3 has a second light-mixing zone 31 corresponding to each first light-mixing zone 11, and the transmission device 2 has a transmission zone 21 arranged between each first light-mixing zone 11 and the first light-mixing zone 11, the transmission zone 21 being adapted for light to travel between the first light-mixing zone 11 and the second light-mixing zone 31. That is, in the transmission device 2, one first light mixing section 11, one transmission device 2 and one second light mixing section 31 can be regarded as one light homogenizing component, and the light homogenizing device comprises at least two such light homogenizing components.

Any of the first light mixing regions 11 has a coupling-in surface 111, and the coupling-in surface 111 may be a light-transmitting surface, specifically a full-transmitting surface, or a partially-transmitting partially-reflecting surface. Light emitted from the light source may enter the first light mixing region 11 through the coupling-in surface 111.

Any one of the first light mixing regions 11 includes a first partially transmissive partially reflective mirror 112 disposed obliquely, and a first total reflection surface 116 mated with the first partially transmissive partially reflective mirror 112. The first partially transmissive and partially reflective mirror 112 and the first total reflective surface 116 cooperate to transmit a portion of the light entering the first light mixing region 11 to the corresponding transmission region 21, and to transmit a portion of the light entering the first light mixing region 11 to other first light mixing regions 11 of the coupling-in device 1.

When the light homogenizing device is specifically applied, at least two coupling-in surfaces 111 of all the first light mixing regions 11 are used for coupling in light rays with different wavelengths, so that after light rays with a certain wavelength enter the first light mixing regions 11, under the action of the first partially-transmitting partially-reflecting mirror 112 and the matched first total-reflecting surface 116, part of light rays enter other first light mixing regions 11, and thus, the light rays with other wavelengths in other first light mixing regions 11 can be mixed, and the light rays with different wavelengths can be mixed. For the multi-chip packaged LED light source, different light emitting chips can be set to emit different colors of light into different first light mixing areas 11, and then the different colors of light are mixed in the coupling-in device 1 under the action of the first partially-transmitting partially-reflecting mirror 112 and the first total-reflecting mirror, which helps to alleviate the problem that the virtual light source array formed by reflection is seriously separated due to the offset of the center positions of the different wavelength light emitting chips relative to the light bar, so that the light homogenizing effect of the light homogenizing device is improved on the premise that the whole length of the light homogenizing device is limited.

It should be noted that at least two coupling-in surfaces 111 are used to couple in light rays of different wavelengths, which does not mean that each coupling-in surface 111 can only be used to couple in light rays of one wavelength. In another embodiment, for any of the coupling-in surfaces 111, the coupling-in surface 111 may correspond to only one wavelength of light, or the coupling-in surface 111 may be configured to allow two or more wavelengths of light to enter. For example, for a common RGBW (Red, green, blue, white, red, green, blue, white) light source, if the light-equalizing device has two first light-mixing regions 11, two colors of light can be provided for each coupling-in surface 111, or if the light-equalizing device has four first light-mixing regions 11, one color of light can be provided for each coupling-in surface 111.

Light entering the first light mixing zone 11 is partially mixed with light of other wavelengths entering an adjacent first light mixing zone 11, and a portion of this light will enter the second light mixing zone 31 through the transmission zone 21. And the second light mixing region 31 includes a second partially transmissive partially reflective mirror 312 disposed obliquely, and a second total reflection surface 316 mated with the partially transmissive partially reflective mirror. The second partially transmissive and partially reflective mirror 312 cooperates with the first total reflective surface 116 to transmit the light entering the second light mixing region 31 to the other second light mixing regions 31 and to the corresponding first light mixing regions 11. The light transmitted from the second light mixing region 31 to the corresponding first light mixing region 11 may be returned to the second light mixing region 31 under the action of the first partially transmitting and partially reflecting mirror 112 and the first total reflecting mirror, and part of the light may enter other first light mixing regions 11 adjacent to the first light mixing region 11, while the light transmitted from the second light mixing region 31 to the adjacent second light mixing region 31 may be returned to the second light mixing region 31 in the original path under the action of the second partially transmitting and partially reflecting mirror 312 of the adjacent second light mixing region 31, and part of the light may be transmitted to the first light mixing region 11 corresponding to the adjacent second light mixing region 31.

For convenience of understanding, referring to fig. 2, fig. 2 is a schematic diagram of two groups of light homogenizing components arranged in parallel, taking two groups of light homogenizing components arranged in parallel as an example, fig. 2 illustrates a part of light paths by using a dashed line with an arrow, after a beam of light enters the first light mixing region 11 from one coupling surface 111, a part of light is repeatedly reflected between the two first light mixing regions 11, a part of light is repeatedly reflected between the first light mixing region 11 and the second light mixing region 31, and a part of light is repeatedly reflected between the two second light mixing regions 31, that is, the light is repeatedly reflected in the same light homogenizing component, and is also repeatedly reflected between the two light homogenizing components. Thus, when the two coupling-in surfaces 111 respectively couple in light rays with different wavelengths, the two light rays can be fully and uniformly mixed between the two groups of light homogenizing components and circularly reflected for multiple times, so that the light homogenizing effect is achieved. Similarly, when the light homogenizing device comprises more light homogenizing components which are arranged in parallel, light rays are repeatedly reflected in the more light homogenizing components, so that the light homogenizing effect is further improved. It is worth to say that when the number of the light homogenizing components is greater than two, all the light homogenizing components can be arranged side by side in a straight shape or can be arranged in an array in the transverse and longitudinal directions.

Alternatively, when a single group of light homogenizing members is specifically provided, the components within the light homogenizing members may be arranged in the order of the first light mixing region 11, the transmission region 21, and the second light mixing region 31. When two or more groups of light homogenizing components are specifically arranged, 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 all the transmission areas 21 are arranged in the middle of the light homogenizing device.

Of all the second light-mixing regions 31, at least one second light-mixing region 31 has a coupling-out face 311 for coupling out light. That is, for the coupling-out device 3 comprising at least two second light-mixing zones 31, the coupling-out surface 311 may be provided only at one second light-mixing zone 31, or the coupling-out surface 311 may be provided at two or more second light-mixing zones 31. Since the light is fully mixed in the light homogenizing device and the light tends to be uniform on any plane after repeated refraction, the coupling surface 311 is arranged in any second light mixing area 31, so that the coupled light is uniformly mixed. In practical implementations, the coupling-out surface 311 is disposed in which second light mixing regions 31, which may be determined according to the actual requirements for light.

It should be noted that, in the embodiment of the present application, the coupling-in surface 111 and the coupling-out surface 311 are both functional descriptions, and when the coupling-in surface 111 and the coupling-out surface 311 are specifically disposed, the coupling-in surface 111 and the coupling-out surface 311 should have a light-transmitting property so that light enters the first light mixing region 11 through the coupling-in surface 111 and is coupled out of the second light mixing region 31 through the coupling-out surface 311, and more specifically, the coupling-in surface 111 and the coupling-out surface 311 may be completely transmissive surfaces or may also be partially transmissive and partially reflective surfaces, respectively. It should be further understood that, in the embodiment of the present application, the light is transmitted between different first light mixing regions 11, and transmitted between the first light mixing regions 11 and the second light mixing regions 31, and transmitted between different second light mixing regions 31, which may be achieved by providing corresponding light transmitting surfaces in the first light mixing regions 11 and the second light mixing regions 31.

When the coupling-in surface 111 is specifically disposed, the coupling-in surface 111 may be disposed opposite to the transmission region 21, so that after the light enters the first light-mixing region 11 through the coupling-in surface 111, part of the light may directly enter the transmission region 21 through the first partially-transmitting partially-reflecting mirror 112, and another part of the light may enter the adjacent first light-mixing region 11 through the reflection of the first partially-transmitting partially-reflecting mirror 112 and the reflection of the first total-reflecting surface 116, or of course, the coupling-in surface 111 may be disposed opposite to the adjacent first light-mixing region 11, so that after the light enters the first light-mixing region 11, part of the light may directly enter the adjacent first light-mixing region 11 through the first partially-transmitting partially-reflecting mirror 112, and another part of the light may enter the transmission region 21 through the reflection of the first partially-transmitting partially-reflecting mirror 112 and the reflection of the first total-reflecting surface 116. When the coupling surface 311 is specifically disposed, the coupling surface 311 may be a surface opposite to the transmission region 21, and since the light is fully and uniformly mixed in the light-homogenizing device, the selection of the coupling surface 311 does not affect the final display effect. Of course, in some possible embodiments, the coupling-out surface 311 may have a certain inclination angle with respect to the transmission area 21 or the adjacent first light-mixing area 11, so that after the light enters the first light-mixing area 11 through the coupling-in surface 111, the light may directly enter the transmission area 21 or the adjacent first light-mixing area 11, or may enter the transmission area 21 or the adjacent first light-mixing area 11 under the reflection of the total reflection surface.

In a specific example, the coupling-in face 111 and the coupling-out face 311 are arranged opposite the transmission region 21, respectively. In this way, when the dodging component is specifically mounted to the projector, the positions of the light emitting chip, the coupling-in surface 111, the coupling-out surface 311 and the light source imaging are all arranged on the same straight line, and the projector has the characteristic of simple structure.

The first light mixing region 11 and the second light mixing region 31 in the embodiment of the present application may be regions surrounded by some lenses, mirrors, and the like. When the first reflecting surface and the first partially transmissive partially reflecting mirror 112 are specifically disposed in the first light mixing region 11, the specific manner of disposition should be determined according to the light path disposition. In fig. 1, exemplary coupling-in surfaces 111 and coupling-out surfaces 311 are highlighted with grey color boxes, for the four first light-mixing zones 11 shown in fig. 1, only one coupling-in surface 111 is exemplarily labeled in one first light-mixing zone 11, which coupling-in surface 111 can be referenced by other coupling-in surfaces 111, and one coupling-in surface 111 is exemplarily labeled in all second light-mixing zones 31, and the position of the coupling-out surface 311 can be referenced also when there are more coupling-in surfaces 111.

Specifically, the first partially transmissive and partially reflective mirrors 112 and the first reflective surfaces need to cooperate to change the propagation direction of part of the light, so that the direction of the first light mixing region 11 pointing to the second light mixing region 31 is taken as a reference direction, the first partially transmissive and partially reflective mirrors 112 are inclined with respect to the reference plane by a certain angle, and the first partially transmissive and partially reflective mirrors 112 are inclined towards at least one direction of the adjacent first light mixing region 11. In this way, when the coupling-in surface 111 is arranged opposite to the transmission area 21, or when the coupling-in surface 111 is arranged opposite to the adjacent first coupling-in 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, for example, the adjacent first light mixing area 11. The number of the first total reflection surfaces 116 may be plural, and the plurality of first total reflection surfaces 116 may be disposed at a side of the first partially transmissive partially reflective mirror 112 facing away from the transmission region 21 or facing away from the adjacent first light mixing region 11, respectively. After the light passes through the first partially transmissive partially reflective mirror 112 or is reflected by the first partially transmissive partially reflective mirror 112, the light propagates in a direction deviating from the first light mixing region 11 or the transmission region 21, and the light is irradiated to the first total reflection surface 116, and returns to the first partially transmissive partially reflective mirror 112 or enters the transmission region 21 or enters the adjacent first light mixing region 11 under the reflection of the first total reflection surface 116.

When the first partially transmissive partially reflective mirror 112 and the second partially transmissive partially reflective mirror 312 are specifically disposed, the number of the first partially transmissive partially reflective mirror 112 and the second partially transmissive partially reflective mirror 312 can be selected according to the actual light path requirement. For example, if the coupling-in device 1 comprises three or more first light-mixing zones 11 and one first light-mixing zone 11 is adjacent to two or more first light-mixing zones 11, only one first partially transmissive partial reflector 112 may be arranged in the first light-mixing zone 11 and the first partially transmissive partial reflector 112 may be tilted towards only one adjacent first light-mixing zone 11 or towards two adjacent first light-mixing zones 11, or two first partially transmissive partial reflectors 112 may be arranged in the first light-mixing zone 11 and the two first partially transmissive partial reflectors 112 may be tilted towards different adjacent first light-mixing zones 11, respectively.

The principle of the second partially transmissive and fully reflective surfaces 312 and 316 is the same as that of the first partially transmissive and fully reflective surfaces 116, so the arrangement of the second partially transmissive and fully reflective surfaces 312 and 316 can be referred to the above description of the arrangement of the first partially transmissive and fully reflective surfaces 116 and will not be repeated here.

Alternatively, the transmissivity of the first partially transmissive partially reflective mirror 112 may be set to be 50%, so that the light passing through the first partially transmissive partially reflective mirror 112 may be equally divided, which is beneficial for uniform mixing of the light in the light homogenizing device, and similarly, the transmissivity of the second partially transmissive partially reflective mirror 312 may be set to be 50%, which is also beneficial for uniform mixing of the light in the light homogenizing device.

In the above technical solution, light with different wavelengths may enter different light mixing regions of the light evening device from different coupling-in surfaces 111, and under the action of the first partially transmitting partially reflecting mirror 112 and the first fully reflecting surface 116, part of the light may enter one first light mixing region 11 to enter another light mixing region to achieve light mixing, and another part of the light may reach the second light mixing region 31 through the transmission region 21, and under the action of the second partially transmitting partially reflecting mirror 312 and the second fully reflecting surface 316, part of the light entering the second light mixing region 31 may be transmitted to the adjacent second light mixing region 31, and under the action of the second partially transmitting partially reflecting mirror 312 and the second fully reflecting surface 316 of the adjacent second light mixing region 31, part of the light may reach the corresponding first light mixing region 11 through the corresponding transmission region 21 from the adjacent second light mixing region 31, so that the light may be circularly reflected between the first light mixing region 11 and the second light mixing region 31, thereby improving the reflection times of the light in the light evening device.

Referring to fig. 3 and fig. 4 together, fig. 3 is a diagram illustrating an example of a first light mixing region according to an embodiment of the present application, and fig. 4 is an exploded view illustrating an example of the first light mixing region according to an embodiment of the present application.

In a possible embodiment, when the first light mixing zones 11 are specifically arranged, each first light mixing zone 11 includes a coupling-in cavity 113 surrounded by a plurality of sides, and the first partially transmissive partially reflective mirror 112 is arranged in the coupling-in cavity 113. The light emitted from the light source enters the first light mixing region 11 through the coupling-in surface 111, i.e. substantially enters the coupling-in cavity 113. In the sides enclosing the coupling-in cavity 113, i.e. comprising the coupling-in surface 111 for coupling light into the first light-mixing region 11, and the light-transmitting surface for entering the transmission region 21 and the adjacent first light-mixing region 11 from the coupling-in cavity 113, a first total reflection surface 116 cooperating with the first partially transmissive partially reflective mirror 112 is comprised.

Specifically, among the plurality of sides surrounding the coupling-in cavity 113, the side opposite to the coupling-in cavity 113 of the adjacent first light-mixing region 11 is the first light-transmitting surface 114, the side opposite to the corresponding transmission region 21 is the second light-transmitting surface 115, and among the other sides except for the first light-transmitting surface 114 and the second light-transmitting surface 115, one side is the coupling-in surface 111, and the other sides are the first total reflection surfaces 116.

After the light enters any coupling-in cavity 113 from the coupling-in surface 111, under the action of the first partially-transmitting partially-reflecting mirror 112 and the first total-reflecting surface 116, part of the light enters the adjacent coupling-in cavity 113 through the first light-transmitting surface 114, and part of the light enters the opposite transmission region 21 through the second light-transmitting surface 115.

The light propagating in the direction of the adjacent first light-mixing region 11 in one first light-mixing region 11 passes through the first light-transmitting surface 114 of the first light-mixing region 11, reaches the first light-transmitting surface 114 of the adjacent first light-mixing region 11, and further reaches the coupling-in cavity 113 of the adjacent first light-mixing region 11. It should be understood that, when a certain first light mixing region 11 is adjacent to two or more first light mixing regions 11, the light in the first light mixing region 11 needs to enter two or more adjacent first light mixing regions 11 respectively, and two or more first light transmitting surfaces 114 may be disposed correspondingly.

The first light mixing region 11 thus arranged directly utilizes the first light transmission surface, the second light transmission surface 115, the coupling-in surface 111 and the total reflection surface to form the coupling-in cavity 113, so that the coupling-in device 1 has a simple structure, and therefore, the assembly space can be saved, and in addition, the other side surfaces except the first light transmission surface 114, the second light transmission surface 115 and the coupling-in surface 111 of the coupling-in cavity 113 are all provided with the total reflection surfaces, so that on one hand, the reflection times of light can be increased, the light homogenizing effect of the light homogenizing device can be improved, the light loss can be reduced, and the final display effect of the light can be improved.

Referring to fig. 5 and fig. 6 together, fig. 5 is an exemplary view of a second light mixing region according to an embodiment of the present application, and fig. 6 is an exemplary exploded view of the second light mixing region according to an embodiment of the present application.

As an alternative embodiment, each second light mixing section 31 comprises a coupling-out cavity 313 surrounded by a plurality of sides, similar to the first light mixing section 11, and the second partially transmissive partially reflective mirror 312 is arranged in the coupling-out cavity 313. The light enters the second light mixing region 31, i.e. the light enters the coupling-out cavity 313 of the second light mixing region 31. In the sides surrounding the coupling-out cavity 313, the coupling-out surface 311 for coupling light out of the second light-mixing region 31 and the light-transmitting surface for allowing light from the transmission region 21 and the adjacent second light-mixing region 31 into the coupling-out cavity 313 are included, and the second total reflection surface 316 is also included, which is matched with the second partially transmissive and partially reflective mirror 312.

The side of the plurality of sides opposite to the coupling-out cavity 313 of the adjacent second light mixing region 31 is a third light-transmitting surface 314, and the side of the plurality of sides opposite to the corresponding transmission region 21 is a fourth light-transmitting surface 315.

The other side surfaces except the third light-transmitting surface 314 and the fourth light-transmitting surface 315 are the coupling-out surface 311 if the second light-mixing region 31 includes the coupling-out surface 311, the second total reflection surface 316 if the second light-mixing region 31 does not include the coupling-out surface 311, and the second total reflection surface 316 if the second light-mixing region 31 does not include the coupling-out surface 311.

After the light enters any coupling-in cavity 113 from the coupling-in surface 111, under the action of the second partially transmissive partially reflective mirror 312 and the second fully reflective surface 316, part of the light enters the adjacent coupling-out 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.

The same principle as the arrangement of the first light-transmitting surfaces 114, the number of the third light-transmitting surfaces 314 may be one, two or more for any one of the second light-mixing regions 31, depending on the number and arrangement of the second light-mixing regions 31.

The second light mixing region 31 thus arranged directly uses the third light transmitting surface 314, the fourth light transmitting surface 315, the coupling-in surface 111 and the total reflection surface to enclose the coupling-in cavity 113, so that the coupling-in device 1 has a compact structure, thereby saving assembly space, and in addition, the other side surfaces except the first light transmitting surface 114, the second light transmitting surface 115 and the coupling-in surface 111 of the coupling-in cavity 113 are all total reflection surfaces, so that on one hand, the reflection times of light rays can be increased, the light homogenizing effect of the light homogenizing device can be improved, the light loss can be reduced, and the final display effect of the light rays can be improved.

As an alternative embodiment, when the coupling-out surface 311 is provided in particular, the coupling-out surface 311 is a partially transmissive and partially reflective surface. When light irradiates the coupling surface 311, part of the light is imaged through the coupling surface 311, and the two parts of the light can be reflected from the coupling surface 311 and return to the coupling cavity 113 to be flushed into the repeated reflection circulation, so that the number of repeated reflection times of the light is increased, and the light homogenizing effect is improved.

Optionally, the transmittance of the coupling surface 311 may be between 20% and 40%, and may specifically be 20%, 25%, 30%, 35%, 40%, etc. By setting the transmittance of the coupling-out surface 311 to be in the above range, on one hand, it can be ensured that enough light reaches the coupling-out surface 311 and is reflected back to the coupling-out cavity 313, thereby improving the light-homogenizing effect, and on the other hand, the risk of problems such as low imaging brightness, large imaging delay and the like caused by too low transmittance can be reduced.

Referring to fig. 7 together, fig. 7 is a diagram illustrating an example of a transmission area in an embodiment of the present application.

As an alternative embodiment, when the transmission device 2 is specifically provided, at least part of the side surface of each transmission region 21 is the third total reflection surface 211. The transmission region 21 is disposed between the first light mixing region 11 and the second light mixing region 31, and may be in a cylindrical shape. The two end surfaces of the cylindrical transmission area 21 correspond to the second light-transmitting surface 115 and the fourth light-transmitting surface 315, respectively, and therefore, the two end surfaces of the transmission area 21 should be light-transmitting surfaces. While the third total reflection surface 211 is used as at least a part of the side surface of the transmission area 21, that is, the third total reflection surface 211 may be used as all the side surface of the transmission area 21, or the third total reflection surface 211 may be used as a part of the side surface of the transmission area 21.

The number of the third total reflection surfaces 211 may be one, two or more, depending on the optical path setting. For the transmission device 2, the number of transmission regions 21 is opposite to the number of first light mixing regions 11 and second light mixing regions 31, and the number of first light mixing regions 11 is two or more, and the number of corresponding transmission regions 21 is two or more. If the opposite sides of the two adjacent transmission areas 21 are set as light transmission surfaces, after the light enters the transmission areas 21, the light can enter the adjacent transmission areas 21 from one transmission area 21, so as to further improve the mixing uniformity of the light. In the case where the side surface of the transmission region 21 opposite to the adjacent transmission region 21 is set as the light-transmitting surface, the third total reflection surface 211 may be used as the other side surface of the transmission region 21.

By providing the third total reflection surface 211, the number of reflection times of the light in the transmission area 21 can be increased, thereby improving the light homogenizing effect of the light homogenizing device.

As an alternative implementation manner, in the transmission device 2 according to the embodiment of the present application, at least two adjacent transmission areas 21 abut against each other, and the side surfaces of the two adjacent transmission areas 21 abutting against each other are partially transmissive and partially reflective surfaces. When the light irradiates the partial transmission and partial reflection surfaces of the transmission areas 21, partial light can enter the adjacent transmission areas 21 and be mixed with the light in the adjacent transmission areas 21, the mixing effect of the light is improved, partial light is reflected back into the transmission areas 21, the reflection times of the light are increased, and the uniform effect of the light is improved. In addition, two adjacent transmission areas 21 are arranged to abut against each other, so that the light homogenizing device has a compact structure and can save the assembly space.

Of course, in some possible embodiments, adjacent transmission areas 21 may also have a certain spacing. When the adjacent transmission areas 21 have a certain interval, the side surfaces of the transmission areas 21 may be all the third total reflection surfaces 211, so as to reduce the risk of light leakage of the transmission device 2 of the light homogenizing device.

As an alternative embodiment, when the transmission device 2 is specifically provided, the transmission device 2 further comprises a diffusing mirror for diffusing the light. Specifically, the diffusing mirror may be provided on the light propagation path inside the transmission region 21, or may be provided on the side of the transmission region 21 opposite to the adjacent transmission region 21. By arranging the diffusion mirror, the light in the transmission area 21 can be more dispersed, so that the light can be more easily irradiated to the third total reflection surface 211 positioned on the side surface of the transmission area 21, the reflection times can be increased, and the light homogenizing effect of the light homogenizing device can be improved.

Referring to fig. 8 together, fig. 8 is a schematic view of an optical path in an embodiment of the application.

As an alternative embodiment, the coupling-in device 1 according to the embodiment of the application comprises four first light-mixing zones 11, and the four first light-mixing zones 11 are arranged in a "field" shape. Each first light mixing region 11 includes two first partially transmissive partially reflective mirrors 112, the two first partially transmissive partially reflective mirrors 112 are disposed to intersect, and the two first partially transmissive partially reflective mirrors 112 are respectively inclined toward two adjacent first light mixing regions 11. As can be seen from the above description of the first partially transmissive partially reflective mirror 112, if the first partially transmissive partially reflective mirror 112 is inclined toward one adjacent first light mixing region 11, the first partially transmissive partially reflective mirror 112 can transmit light to the transmission region 21 and the adjacent first light mixing region 11, respectively. Thus, the two first partially transmissive partially reflective mirrors 112 are used to propagate light entering the first light mixing region 11 to two adjacent first light mixing regions 11 and to the corresponding second light mixing regions 31 through the transmission regions 21.

The light rays passing through the two first partially transmissive partially reflective mirrors 112 may be light rays directly from the coupling-in surface 111, light rays reflected by the first total reflection surface 116, or light rays from the first light-transmitting surface 114 or the second light-transmitting surface 115. Thus, when light passes through the two first partially transmissive partially reflective mirrors 112 during the progress toward the transmission region 21, the two first partially transmissive partially reflective mirrors 112 can propagate light to the transmission region 21 and the two adjacent first light mixing regions 11, respectively. The light path is reversible, so that when light passes through the two first partially transmissive partially reflective mirrors 112 in other directions, the light will also propagate in different directions, respectively. For example, when light passes through two first partially transmissive partially reflective mirrors 112 in a direction away from the transmission region 21, part of the light will propagate towards one adjacent first light mixing region 11, part of the light will propagate towards the other adjacent first light mixing region 11, and part of the light will also continue to propagate in a direction away from the transmission region 21.

The four first light mixing areas 11 are arranged in a shape of a Chinese character 'tian', which means that the four first light mixing areas 11 are arranged in two rows and two columns, and on one hand, the arrangement mode makes the arrangement of light homogenizing components in the light homogenizing device compact. On the other hand, as shown in fig. 8, two first partially transmissive partially reflective mirrors 112 are disposed in each first light mixing region 11, so that light rays can form two cycles in the light homogenizing device. One of the cycles is a cycle of light between four first light mixing regions 11, i.e., the a cycle in fig. 8, and the other cycle is a cycle of light between a set of two adjacent light homogenizing components, i.e., the B cycle in fig. 8. The two circulating light paths can increase the reflection times of light rays in a limited space, so that the light homogenizing effect of the light homogenizing device is improved.

With continued reference to fig. 3, alternatively, when a plurality of sides are specifically employed to enclose the coupling-in cavity 113, the coupling-in cavity 113 may have a quadrangular prism shape, and the two first partially transmissive partially reflective mirrors 112 are disposed along two diagonal cuts of the coupling-in cavity 113, respectively. It should be appreciated that the coupling-in cavity 113 is only one cavity, whereas the quadrangular prism shape is only used to shape the cavity. The two first partially transmitting and partially reflecting mirrors 112 are arranged as described above, so that on one hand, the first partially transmitting and partially reflecting mirror 112 occupies all the diagonal surfaces, and all the light rays can reach the next component after passing through the first partially transmitting and partially reflecting mirror 112, and the light rays are reflected by reflection necessarily when passing through the first partially transmitting and partially reflecting mirror 112, so that the reflection times of the light rays can be increased, and the light rays are more uniform, and on the other hand, the first partially transmitting and partially reflecting mirror 112 arranged in this way can be directly fixed at the edge of the coupling-in cavity 113, and the assembly difficulty is reduced.

As an alternative embodiment, each second light mixing region 31 includes two second partially transmissive partially reflective mirrors 312, and the two second partially transmissive partially reflective mirrors 312 are respectively inclined at an angle toward two adjacent second light mixing regions. As can be seen from the above description of the first partially transmissive and partially reflective mirror 112, if the second partially transmissive and partially reflective mirror 312 is inclined towards one adjacent second light mixing region 31, after the light entering the second light mixing region 31 from the transmission region 21 passes through the two second partially transmissive and partially reflective mirrors 312, part of the light enters one adjacent second light mixing region 31, part of the light enters the other adjacent second light mixing region 31, and part of the light proceeds along the direction of the transmission region 21 pointing to the second light mixing region 31. The light traveling along the direction of the transmission area 21 toward 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 from the second light mixing area 31.

It should be understood that the light entering the second light mixing region 31 may be the light from the transmission region 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. Light from the third light-transmitting surface 314 or the fourth light-transmitting surface 315 is light from one adjacent second light-mixing region 31, and when the light passes through the two second partially-transmitting partial reflectors 312, part of the light will be transmitted to the other adjacent second light-mixing region 31, part of the light will enter the transmission region 21 and finally reach the first light-mixing region 11, and part of the light will propagate along the direction of the transmission region 21 pointing to the second light-mixing region 31 and finally reach the second total reflection surface 316 or the coupling-out surface 311.

By providing two second partially transmissive partially reflective mirrors 312 in the second light mixing regions 31 as described above, a circulating light path, i.e., a C-cycle as in fig. 8, can be formed between four second light mixing regions 31, and further a circulating light path, i.e., a D-cycle as in fig. 8, can be formed between two adjacent light homogenizing components in different B-cycles. The reflection times of the light rays can be further improved through the formation of the C cycle and the D cycle, so that the light homogenizing effect of the light homogenizing device is further improved.

For the coupling-in device 1 comprising four first light mixing regions 11, if the four transmission devices 2 are adjacent to each other and abut against each other, and the abutting surfaces of the two adjacent transmission devices 2 are light-transmitting surfaces, a first partially-transmitting partially-reflecting mirror 112 inclined towards the two adjacent first light mixing regions 11 and a second partially-transmitting partially-reflecting mirror 312 inclined towards the two adjacent second light mixing regions 31 are arranged at the same time in the first light mixing regions 11, respectively, so that besides the four circulating light paths A, B, C, D are realized in the light homogenizing device, light can also form a light path circulation between the two adjacent first light mixing regions 11 and the second light mixing regions 31 corresponding to the other two first light mixing regions 11, and more light circulation reflection loops can be formed in the light homogenizing device, thereby further improving the light reflection times of the light homogenizing device and improving the light homogenizing effect of the light homogenizing device.

Alternatively, when each of the second light mixing regions 31 includes the coupling-out cavity 313 surrounded by a plurality of sides, the coupling-out cavity 313 has a quadrangular prism shape, and the two second partially transmissive partially reflective mirrors 312 are disposed along two diagonal surfaces of the coupling-out cavity 313, respectively. Likewise, the coupling-out cavity 313 is only one cavity, whereas the quadrangular prism shape is only used to shape the cavity. The advantage of providing the second partially transmissive partially reflective mirror 312 is referred to above for the first partially transmissive partially reflective mirror 112, and will not be described here.

In some possible embodiments, the number of the first partially transmissive partially reflective mirrors 112 in the first light mixing region 11 may be three, and the three first partially transmissive partially reflective mirrors 112 are respectively disposed along three diagonal surfaces of the coupling-in cavity 113, and the number of the second partially transmissive partially reflective mirrors 312 in the second light mixing region 31 may be three, and the three second partially transmissive partially reflective mirrors 312 are disposed along three diagonal surfaces of the coupling-out cavity 313, so as to further improve the reflection times of the light and improve the light homogenizing effect of the light homogenizing device.

When the first partially transmissive and partially reflective mirrors 112 and 312 are specifically disposed, the first and second partially transmissive and partially reflective mirrors 112 and 312 may be disposed to be half-transmissive and half-reflective, so that the light passing through the first and second partially transmissive and partially reflective mirrors 112 and 312 is uniformly distributed in different directions, thereby improving the uniformity of light mixing.

The embodiment of the application also provides a projection light machine, which comprises any light homogenizing device, wherein the light homogenizing device is arranged in the light path of the projection light machine.

In the light homogenizing device used in the projection light machine, light with different wavelengths can enter different light mixing areas of the light homogenizing device from different coupling surfaces 111, and under the action of the first partially-transmitting partially-reflecting mirror 112 and the first fully-reflecting surface 116, part of light can enter one first light mixing area 11 to enter the other light mixing area to achieve light mixing, the other part of light can reach the second light mixing area 31 through the transmission area 21, under the action of the second partially-transmitting partially-reflecting mirror 312 and the second fully-reflecting surface 316, part of light entering the second light mixing area 31 can be transmitted to the adjacent second light mixing area 31, and under the action of the second partially-transmitting partially-reflecting mirror 312 and the second fully-reflecting surface 316 of the adjacent second light mixing area 31, part of light can reach the corresponding first light mixing area 11 through the corresponding transmission area 21, so that the light can be circularly reflected between the first light mixing area 11 and the second light mixing area 31, and the number of times of light reflection in the light homogenizing device is improved, and the light homogenizing effect of the light homogenizing device is improved.

The present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the one or more embodiments of the disclosure, are therefore intended to be included within the scope of the disclosure.

The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (12)

1. The light homogenizing device is characterized by comprising a coupling-in device, a transmission device and a coupling-out device which are oppositely arranged, wherein:

The coupling-in device is provided with at least two first light mixing areas, the coupling-out device is provided with a second light mixing area corresponding to each first light mixing area, each first light mixing area is provided with a coupling-in surface for coupling in light rays, and the at least two coupling-in surfaces are respectively used for coupling in light rays with different wavelengths;

The transmission device is provided with a transmission area arranged between each first light mixing area and each second light mixing area, and the transmission area is used for allowing light to pass back and forth between the first light mixing area and the second light mixing area;

Any one of the first light mixing areas comprises a first partial transmission partial reflector which is obliquely arranged and a first total reflection surface which is matched with the first partial transmission partial reflector, and 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 one of the second light mixing areas comprises a second partial transmission partial reflector which is obliquely arranged and a second total reflection surface which is matched with the second partial transmission partial reflector, and is used for transmitting received light to other second light mixing areas and transmitting the received light to the corresponding first light mixing areas through the transmission areas;

At least one of the second light mixing regions has a coupling-out surface for coupling out light.

2. The light homogenizing device of claim 1, wherein each of the first light mixing zones comprises a coupling-in cavity surrounded by a plurality of sides, the first partially transmissive partially reflective mirror disposed within the coupling-in cavity;

The side surface of the plurality of side surfaces, which is opposite to the coupling-in cavity of the adjacent first light mixing area, is a first light transmission surface, the side surface of the plurality of side surfaces, which is opposite to the corresponding transmission area, is a second light transmission surface;

After light enters any coupling-in cavity from the coupling-in surface, under the action of the first partial transmission partial reflector and the first total reflection surface, part of the light enters the adjacent coupling-in cavity through the first light transmission surface, and part of the light enters the opposite transmission area through the second light transmission surface.

3. The light homogenizing device of claim 2, wherein each of the second light mixing zones comprises an out-coupling cavity surrounded by a plurality of sides, the second partially transmissive partially reflective mirror disposed within the out-coupling cavity;

The side surface, opposite to the coupling-out cavity of the adjacent second light mixing region, of the plurality of side surfaces is a third light transmission surface, and the side surface, opposite to the corresponding transmission region, of the plurality of side surfaces is a fourth light transmission surface;

The other side surfaces except the third light-transmitting surface and the fourth light-transmitting surface are respectively a coupling surface and a second total reflection surface if the second light-mixing region comprises the coupling surface, and a second total reflection surface if the second light-mixing region does not comprise the coupling surface

After light enters any coupling-in cavity from the coupling-in surface, under the action of the second partial transmission partial reflector and the second total reflection surface, part of the light enters an adjacent coupling-out cavity through the third light transmission surface, and part of the light enters an opposite transmission area through the fourth light transmission surface.

4. The light homogenizing device of claim 1, wherein the coupling surface is a partially transmissive partially reflective surface.

5. The light homogenizing device of claim 1, wherein at least a portion of a side surface of each of the transmitting zones is a third total reflection surface.

6. The light homogenizing device of claim 5, wherein at least two adjacent ones of the transmission zones abut each other and a side of the two adjacent ones of the transmission zones that abut each other is a partially transmissive partially reflective surface.

7. The light homogenizing apparatus of claim 5, wherein the transmitting apparatus further comprises a diffusing mirror;

the diffusion mirror is arranged in the transmission area and used for diffusing light.

8. The light evening device according to any one of claims 1 to 7, wherein the coupling-in device comprises four first light mixing areas, the four first light mixing areas being arranged in a "field" shape;

Each first light mixing region comprises two first partial transmission partial reflectors which are arranged in a crossing way, and the two first partial transmission partial reflectors incline towards two adjacent first light mixing regions respectively;

the two first partial transmission partial reflectors are used for transmitting the light entering the first light mixing areas to two adjacent first light mixing areas and transmitting the light to the corresponding second light mixing areas through the transmission areas.

9. The light homogenizing device of claim 8, wherein when each of the first light mixing regions comprises a coupling-in cavity surrounded by a plurality of sides, the coupling-in cavity is quadrangular, and two of the first partially transmissive partially reflective mirrors are disposed along two diagonal facets of the coupling-in cavity, respectively.

10. The light homogenizing apparatus of claim 8, wherein each of the second light mixing zones comprises two second partially transmissive partially reflective mirrors, and the two second partially transmissive partially reflective mirrors are respectively tilted toward two adjacent second light mixing zones;

the two second partially transmitting partially reflecting mirrors are used for transmitting the received light rays to two adjacent second light mixing areas and transmitting the received light rays to the corresponding first light mixing areas through the transmission areas.

11. The light homogenizing device of claim 10, wherein when each of the second light mixing regions comprises a coupling-out cavity surrounded by a plurality of sides, the coupling-out cavity is in a shape of a quadrangular prism, and two of the second partially transmissive partially reflective mirrors are disposed along two diagonal facets of the coupling-out cavity, respectively.

12. A projection light machine, comprising the light uniformizing device according to any one of claims 1 to 11, wherein the light uniformizing device is disposed in an optical path of the projection light machine.