CN219758590U

CN219758590U - Light mixing structure

Info

Publication number: CN219758590U
Application number: CN202320521203.XU
Authority: CN
Inventors: 程治明; 黄哲; 明玉生; 王聪; 贾敏; 陈远
Original assignee: Ningbo Sunny Olai Technology Co ltd
Current assignee: Ningbo Sunny Olai Technology Co ltd
Priority date: 2023-03-13
Filing date: 2023-03-13
Publication date: 2023-09-26
Anticipated expiration: 2033-03-13

Abstract

The utility model provides a light mixing structure. The light mixing structure comprises a light incident surface, a light emergent surface and a light mixing cavity surrounded by two side surfaces, wherein the light incident surface is opposite to the light emergent surface, the light emergent surface comprises a total reflection area, a first emergent area and a second emergent area, the total reflection area is positioned between the first emergent area and the second emergent area, at least part of incident light enters the light mixing cavity from the light incident surface, then propagates along a first direction and a second direction after passing through the total reflection area, finally is emergent from the first emergent area and the second emergent area respectively, the first direction is opposite to the second direction, and the direction of Y component of at least part of incident light is the same. The utility model solves the problem that the miniaturization and the emergent light spot area expansion of the light mixing structure in the prior art are difficult to be simultaneously compatible.

Description

Light mixing structure

Technical Field

The utility model relates to the technical field of three-dimensional imaging equipment, in particular to a light mixing structure.

Background

With the development of the optical field and the increase of the use thereof, the imaging display device is developed toward diversification. For example, the iterative trend of intelligent wearable devices, AR/VR (AR/VR) optical machines and the like gradually changes to miniaturization along with market demands, and the size of the lighting module needs to be as small as possible so as to be applied to miniaturized portable products, and meanwhile, a large-scale lighting spot area can be required to be realized, the utilization rate of light source energy is improved, and higher requirements are put forward for optical designers.

In the field of illumination optics, it is always a great difficulty to homogenize light rays, and it is necessary to homogenize light rays of different wavelengths in a certain space so as to achieve the purpose of uniform spatial color distribution. At present, the traditional light mixing modes such as a diffuse reflection light mixing cavity and a light guide column are adopted, the principle is based on the fact that light rays are reflected and mixed for multiple times in space, but the traditional light mixing structure cannot achieve the effect of light spot area expansion, and the functionality is poor.

That is, the light mixing structure in the prior art has the problem that miniaturization and expansion of the area of the emergent light spot are difficult to be simultaneously achieved.

Disclosure of Invention

The utility model mainly aims to provide a light mixing structure so as to solve the problem that miniaturization and emergent light spot area expansion of the light mixing structure in the prior art are difficult to be simultaneously combined.

In order to achieve the above objective, the present utility model provides a light mixing structure, including a light incident surface, a light emergent surface, and a light mixing cavity surrounded by two sides, where the light incident surface is opposite to the light emergent surface, the light emergent surface includes a total reflection area, a first exit area, and a second exit area, the total reflection area is located between the first exit area and the second exit area, at least part of incident light enters the light mixing cavity from the light incident surface, and propagates along a first direction and a second direction after passing through the total reflection area, and finally exits from the first exit area and the second exit area, respectively, where the first direction is opposite to the second direction, and the first direction is the same as the Y component direction of at least part of the incident light.

Further, the first direction and the second direction are perpendicular to the thickness direction of the light mixing structure.

Further, the light incident surface comprises an incident area, a first reflecting area and a second reflecting area, the incident area is located between the first reflecting area and the second reflecting area, the incident area is opposite to the total reflecting area, the first reflecting area is opposite to the first emergent area, the second reflecting area is opposite to the second emergent area, light transmitted along the first direction after passing through the total reflecting area is reflected to the first emergent area by the first reflecting area, and light transmitted along the second direction after passing through the total reflecting area is reflected to the second emergent area by the second reflecting area.

Further, the incident area, the first reflection area, the second reflection area, the total reflection area, the first emergent area and the second emergent area form a group of light mixing components, the light mixing structure comprises a plurality of groups of light mixing components, and the plurality of groups of light mixing components are sequentially arranged along the first direction and/or the second direction.

Further, the incident area is a plane.

Further, the total reflection area comprises a first total reflection surface and a second total reflection surface, the first total reflection surface is connected with the second total reflection surface in an angle mode, the distance between the first total reflection surface and the second total reflection surface is gradually reduced along the direction away from the light incidence surface, a part of light rays incident from the incidence area are transmitted along the first direction after being subjected to total reflection of the first total reflection surface and the second total reflection surface in sequence, and another part of light rays incident from the incidence area are transmitted along the second direction after being subjected to total reflection of the second total reflection surface and the first total reflection surface in sequence.

Further, an angle between the first total reflection surface and the second total reflection surface is 30 ° or more and 150 ° or less.

Further, the first reflection area comprises a first reflection surface and a second reflection surface which are connected in an angle manner, the distance between the first reflection surface and the second reflection surface is gradually reduced along the direction away from the light-emitting surface, the first reflection surface is used for receiving the light rays of the total reflection area, the second reflection area comprises a third reflection surface and a fourth reflection surface which are connected in an angle manner, the distance between the third reflection surface and the fourth reflection surface is gradually reduced along the direction away from the light-emitting surface, the third reflection surface is used for receiving the light rays of the total reflection area, the fourth reflection surface is used for receiving the light rays of the third reflection surface, the first reflection surface and the third reflection surface are respectively connected with two sides of the incidence area, and the angle between the first reflection surface and the second reflection surface is more than or equal to 30 degrees and less than or equal to 150 degrees; and/or an angle between the third reflecting surface and the fourth reflecting surface is 30 ° or more and 150 ° or less.

Further, the first emergent area is a microstructure formed by connecting planar or multi-section sections in sequence at an angle; and/or the second emergent area is a microstructure formed by connecting planar or multi-section sections in sequence at an angle.

Further, when the first exit area and/or the second exit area are planar, a microlens array is disposed on the planar surface.

Further, when the first exit area and/or the second exit area are/is a microstructure, a microlens array is disposed on at least one surface section of the microstructure.

By applying the technical scheme of the utility model, the light mixing structure comprises a light incident surface, a light emergent surface and a light mixing cavity surrounded by two side surfaces, wherein the light incident surface is opposite to the light emergent surface, the light emergent surface comprises a total reflection area, a first emergent area and a second emergent area, the total reflection area is positioned between the first emergent area and the second emergent area, at least part of incident light enters the light mixing cavity from the light incident surface, and then propagates along a first direction and a second direction respectively after passing through the total reflection area, finally, the light is emergent from the first emergent area and the second emergent area respectively, the first direction is opposite to the second direction, and the first direction is the same as the Y component direction of at least part of incident light.

The light is reflected back to the light mixing structure for transmission through the total reflection area arranged on the light emitting surface, the thickness of the light mixing structure is used as a light mixing cavity, a light mixing element is not required to be additionally arranged, the required volume of light mixing is greatly reduced, miniaturization and portability of the light mixing structure and a light mixing module are facilitated, the total reflection area diffuses light in multiple directions, the light is not limited to the position of the light for changing the light emitting direction through total reflection, the total reflection area can change the propagation direction of the light in the light mixing cavity, the incident light enters the light mixing cavity from the light entering surface, then the light enters the total reflection area and propagates along the first direction and the second direction respectively, finally the light is emitted from the first light emitting area and the second light emitting area respectively, the first direction is opposite to the second direction, and the Y component direction of at least part of the incident light is the same. By the arrangement, light rays are subjected to multiple total reflections in the light mixing cavity along different directions of the first direction and the second direction, and then are emitted from the light emitting surface corresponding to the light entering surface in a large-area and large-solid angle mode, so that the area of an emergent light spot can be effectively expanded, better light mixing and area expansion effects of light beams are achieved, the area of the emergent light spot is enlarged, the light source utilization rate is improved, and uniform light mixing is realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic light path diagram of a light mixing structure according to an alternative embodiment of the present utility model;

FIG. 2 is a schematic view showing light transmission along a first direction of the light mixing structure of FIG. 1;

FIG. 3 is a schematic view showing light transmission along a second direction of the light mixing structure of FIG. 1;

FIG. 4 shows an enlarged view of the optical path in FIG. 2;

FIG. 5 shows an enlarged view of the optical path in FIG. 3;

FIG. 6 shows a schematic light path diagram of a light mixing structure of the present utility model;

FIG. 7 shows a schematic view of the exit area of a light mixing structure according to an alternative embodiment of the utility model;

FIG. 8 shows a schematic view of the exit area of a light mixing structure according to another alternative embodiment of the utility model;

FIG. 9 shows a schematic view of the exit area of a light mixing structure according to another alternative embodiment of the utility model;

fig. 10 shows a schematic view of an exit area of a light mixing structure according to another alternative embodiment of the utility model.

Wherein the above figures include the following reference numerals:

10. a light incident surface; 11. an incident area; 12. a first reflective region; 121. a first reflecting surface; 122. a second reflecting surface; 13. a second reflective region; 131. a third reflective surface; 132. a fourth reflecting surface; 20. a light-emitting surface; 21. a total reflection region; 211. a first total reflection surface; 212. a second total reflection surface; 22. a first exit region; 23. a second exit region; 24. a microlens array; 30. a side surface; 40. a first direction; 50. a second direction; 60. a light source.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs unless otherwise indicated.

In the present utility model, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present utility model.

The utility model provides a light mixing structure, which aims to solve the problem that miniaturization and emergent light spot area expansion of the light mixing structure in the prior art are difficult to be simultaneously compatible.

As shown in fig. 1 to 10, the light mixing structure includes a light mixing cavity surrounded by a light incident surface 10, a light emergent surface 20 and two side surfaces 30, the light incident surface 10 is opposite to the light emergent surface 20, the light emergent surface 20 includes a total reflection area 21, a first emergent area 22 and a second emergent area 23, the total reflection area 21 is located between the first emergent area 22 and the second emergent area 23, at least part of incident light enters the light mixing cavity from the light incident surface 10, and then propagates along a first direction 40 and a second direction 50 after passing through the total reflection area 21, and finally exits from the first emergent area 22 and the second emergent area 23 respectively, the first direction 40 is opposite to the second direction 50, and the first direction 40 is the same as the Y component direction of at least part of the incident light.

By arranging the total reflection area 21 on the light emergent surface 20, the light is reflected back into the light mixing structure for transmission, the thickness of the light mixing structure is taken as a light mixing cavity, no additional light mixing element is required, the required volume of light mixing is greatly reduced, miniaturization and portability of the light mixing structure and the light mixing module are facilitated, and the total reflection area 21 diffuses the light in multiple directions, so that the total reflection area 21 is not limited to change the position of the emergent light by total reflection, the propagation direction of the light in the light mixing cavity is changed, the incident light enters the light mixing cavity from the light incident surface 10, and then propagates along the first direction 40 and the second direction 50 after passing through the total reflection area 21, and finally exits from the first emergent area 22 and the second emergent area 23 respectively, wherein the first direction 40 is opposite to the second direction 50, and the Y component direction of the first direction 40 is the same as the Y component direction of at least part of the incident light. By the arrangement, light rays are subjected to multiple total reflections in the light mixing cavity along different directions of the first direction 40 and the second direction 50, and then are emitted from the light emitting surface 20 corresponding to the light incident surface 10 in a large-area and large-solid angle mode, the area of an emergent light spot can be effectively expanded, the light beam achieves better light mixing and area expansion effects, the emergent light spot area is enlarged, and the utilization rate of the light source 60 and uniform light mixing are improved.

As shown in fig. 1, the first direction 40 and the second direction 50 are perpendicular to the thickness direction of the light mixing structure. As can be seen from the figure, the first direction 40 is downward, the second direction 50 is upward, and the light beam propagation direction is the thickness direction of the light mixing structure. The light emitted by the light source 60 enters the light mixing cavity through the light incident surface 10, and it can be clearly seen from the figure that the light in the light mixing cavity diffuses toward the directions of the two side surfaces 30, the two side surfaces 30 are oppositely arranged, the length of the two side surfaces 30 is the thickness of the light mixing structure, and then the light is emitted from the first emitting area 22 and the second emitting area 23 of the corresponding light emitting surface 20, so as to realize the light mixing and the expansion of the light emitting area 20. Also shown in fig. 1 are schematic diagrams of the incident light ray, the incident light ray Y component, the incident light ray X component, the outgoing light ray X component, and the outgoing light ray Y component.

As shown in fig. 2 and 3, the light incident surface 10 includes an incident area 11, a first reflective area 12 and a second reflective area 13, the incident area 11 is located between the first reflective area 12 and the second reflective area 13, and the incident area 11 is opposite to the total reflective area 21, the first reflective area 12 is opposite to the first exit area 22, and the second reflective area 13 is opposite to the second exit area 23, so that the light transmitted along the first direction 40 after passing through the total reflective area 21 is reflected by the first reflective area 12 to the first exit area 22, and the light transmitted along the second direction 50 after passing through the total reflective area 21 is reflected by the second reflective area 13 to the second exit area 23. By arranging the incident area 11 to correspond to the total reflection area 21, the incident light entering the light mixing cavity through the incident area 11 can be stably received by the total reflection area 21, so that the effect of changing the light propagation direction of the total reflection area 21 is ensured, and the light can be propagated in two opposite directions in the light mixing cavity; meanwhile, by arranging the first reflection area 12 to correspond to the first exit area 22 and the second reflection area 13 to correspond to the second exit area 23, it is beneficial to ensure that the light transmitted along the first direction 40 after passing through the total reflection area 21 can be stably received by the first reflection area 12, then reflected by the first reflection area 12 to exit from the first exit area 22, the light transmitted along the second direction 50 after passing through the total reflection area 21 can be received by the second reflection area 13, and then reflected by the second reflection area 13 to exit from the second exit area 23. Light is mixed in the light mixing cavity through multiple reflections, and meanwhile, light diffusion is realized through transmission along two opposite directions, so that the expansion light source 60 can be effectively controlled, and better light mixing and area expansion effects are achieved for the light beam.

As shown in fig. 6, the incident area 11, the first reflection area 12, the second reflection area 13, the total reflection area 21, the first exit area 22, and the second exit area 23 form a set of light mixing members, and the light mixing structure includes a plurality of sets of light mixing members, which are sequentially arranged along the first direction 40 and the second direction 50. That is, the multiple groups of light mixing components are sequentially arranged along the vertical direction of the thickness direction of the light mixing structure, and as each group of light mixing components can realize multi-directional transmission of light in the light mixing cavity, the multiple groups are arranged, so that the light mixing structure is beneficial to fully mixing light in the light mixing cavity, the light mixing and homogenizing effect of the light mixing structure is beneficial to being increased, the display uniformity of emergent light spots is ensured, the coverage area of the output light spots is further increased, and the utilization rate of the light source 60 is greatly improved.

Specifically, the incident area 11 is an interface where light is refracted into the light mixing structure through a certain medium, the interface can be a microstructure and plane combination designed according to the target requirement, the light beam in a specific angle range is controlled to be totally reflected, and the light beam propagates in the light mixing structure, and can also enter the light mixing element at a specific refraction angle according to a curved surface and an inclined surface designed according to the target requirement; in a specific embodiment of the utility model, the entrance area 11 is planar.

Specifically, the light-emitting surface 20 is an interface where light is refracted to the outside by the light-mixing structure, and the interface can be a combination of a microstructure and a plane designed according to the target requirement, so that light beams within a specific angle range are controlled to be totally reflected and returned to the light-mixing cavity to be transmitted, so that the light beams are laterally diffused in the light-mixing cavity, or can be a combination of a plane and an inclined plane designed according to the target requirement and the microstructure; the transverse direction is the first direction 40 and the second direction 50.

In the embodiment of the present utility model, as shown in fig. 2 to 5, the total reflection area 21 includes a first total reflection surface 211 and a second total reflection surface 212, the first total reflection surface 211 and the second total reflection surface 212 are connected at an angle, and the distance between the first total reflection surface 211 and the second total reflection surface 212 is gradually reduced along the direction far from the light incident surface 10, so that the total reflection area 21 protrudes out of the light emergent surface 20, a part of the light incident from the incident area 11 is transmitted along the first direction 40 after being sequentially totally reflected by the first total reflection surface 211 and the second total reflection surface 212, and another part of the light incident from the incident area 11 is transmitted along the second direction 50 after being sequentially totally reflected by the second total reflection surface 212 and the first total reflection surface 211, that is, by adjusting the angle between the first total reflection surface 211 and the second total reflection surface 212, the total reflection light reflected by each other can be received, so that the light incident on the first total reflection surface 211 is totally reflected on the second total reflection surface 212 and then is totally reflected by the second total reflection surface 212 to the first total reflection surface 12 and then enters the first total reflection area 10; the light incident on the second total reflection surface 212 is totally reflected to the first total reflection surface 211, and then totally reflected by the first total reflection surface 211 to the second reflection area 13 of the light incident surface 10, so as to realize multiple reflections of the light between the structures on the light incident surface 10 and the light emergent surface 20, which is beneficial to realizing sufficient light mixing.

The direction from the second total reflection surface 212 to the first total reflection surface 211 is the second direction 50, and the direction from the first total reflection surface 211 to the second total reflection surface 212 is the first direction 40.

As shown in fig. 2 to 5, the angle between the first total reflection surface 211 and the second total reflection surface 212 is 30 ° or more and 150 ° or less. The total reflection area 21 is composed of a first total reflection surface 211 and a second total reflection surface 212, by restricting the angle between the first total reflection surface 211 and the second total reflection surface 212 to be in the range of 30 ° to 150 °, it is beneficial to ensure that the first total reflection surface 211 can receive the light reflected by the second total reflection surface 212, the second total reflection surface 212 can receive the light reflected by the first total reflection surface 211, so that the light reflected by the first total reflection surface 211 and the light reflected by the second total reflection surface can be received by each other, so as to ensure the effect that the total reflection area 21 changes the light transmission direction, so as to ensure that the light can be transmitted to the first direction 40 and the second direction 50 after passing through the total reflection area 21, and then the light transmitted to the two directions can be emitted from the appointed area of the light emitting surface 20, so that the emergent position, emergent angle and the area of the extended light source 60 of the light emitting surface 20 are changed, and the extended area of the extended light source 60 is realized.

As shown in fig. 4 and fig. 5, the first reflective area 12 includes a first reflective surface 121 and a second reflective surface 122 that are connected at an angle, and the distance between the first reflective surface 121 and the second reflective surface 122 gradually decreases along the direction away from the light-emitting surface 20, so that the first reflective area 12 is disposed protruding from the light-emitting surface 10, the first reflective surface 121 is configured to receive the light transmitted by the second total reflective surface 212 of the total reflective area 21, then the first reflective surface 121 reflects the light to the second reflective surface 122, the second reflective surface 122 is configured to receive the light of the first reflective surface 121, and then the second reflective surface 122 reversely disposes the light to the first light-emitting area 22 for emitting; the second reflecting area 13 includes a third reflecting surface 131 and a fourth reflecting surface 132 which are connected in an angle, the distance between the third reflecting surface 131 and the fourth reflecting surface 132 gradually decreases along the direction away from the light emitting surface 20, so that the second reflecting area 13 is arranged protruding from the light entering surface 10, the third reflecting surface 131 is used for receiving the light transmitted by the first total reflecting surface 211 of the total reflecting area 21, the third reflecting surface 131 reversely arranges the light into the fourth reflecting surface 132, the fourth reflecting surface 132 is used for receiving the light of the third reflecting surface 131, then the fourth reflecting surface 132 reversely arranges the light into the second emitting area 23 for emitting, the first reflecting surface 121 and the third reflecting surface 131 are respectively connected with two sides of the incident area 11, and the angle between the first reflecting surface 121 and the second reflecting surface 122 is more than or equal to 30 degrees and less than or equal to 150 degrees; the angle between the third reflecting surface 131 and the fourth reflecting surface 132 is 30 ° or more and 150 ° or less. By restricting the angle between the first reflecting surface 121 and the second reflecting surface 122 to be within a reasonable range, it is beneficial to ensure that the light rays reflected by the two surfaces can be received stably by each other; also, restricting the angle between the third reflecting surface 131 and the fourth reflecting surface 132 to be within a reasonable range is beneficial to ensuring that the light rays reflected by the third reflecting surface and the fourth reflecting surface can be received stably by each other; thereby ensuring that light transmitted in the first direction 40 and the second direction 50 can be continuously reflected in the light mixing cavity to achieve sufficient light mixing.

Specifically, the first and second exit regions 22 and 23The function is to refract the light in the light mixing cavity to the outside and realize diffusion. The first emergent region 22 is a microstructure formed by sequentially connecting planar or multi-section sections at an angle; the second exit area 23 is a microstructure formed by connecting planar or multi-segment sections in sequence at an angle. In the specific embodiment of the application, as shown in fig. 8, the first exit area 22 and the second exit area 23 are both planar. As shown in fig. 7, in other embodiments of the present utility model, at least one of the first exit region 22 and the second exit region 23 may also be a microstructure in which two surface segments are connected at an angle in a direction away from the light entrance surface 10,is the angle between one of the segments and the light exit surface 20.

As shown in fig. 9, in other embodiments of the present utility model, when one or more of the first and second exit regions 22 and 23 is a plane, a microlens array 24 is disposed on the plane. The light source 60 is incident on the light mixing structure at a specific angle, and the light beam diffusion is achieved by adding the microlens array 24 to the plane of the exit region.

As shown in fig. 10, in other embodiments of the present utility model, when one or more of the first and second exit regions 22 and 23 are microstructures, at least one of the surface sections of the microstructures is provided with a microlens array 24. By adding a microlens array 24 to at least one of the microstructures, the diffusing effect of the lens array on light is facilitated.

The following describes the design process of the light mixing structure according to the present utility model with reference to specific embodiments:

as shown in fig. 4 and 5, the design of the one-way total reflection area 21, the optical path as shown, where i is the angle at which light is refracted into the light mixing structure and θ is the angle of the cone angle (0 ° < θ < pi). The first reflection area 12, the second reflection area 13 and the total reflection area 21 have the same theta, and the angles 1, 2, 3 and 4 are respectively the incidence angles on the conical inclined planes, and theta' is the incidence angle from the total reflection to the light-emitting surface 20 after total reflection, so _out Is the emergence angle.

Alpha is the refraction angle of the incident light after propagating to the light incident surface 10, and is known from the law of refraction:

α＝arcsin(n ₀ sini/n)-----------------(1)

to make the totally reflected light continue to propagate laterally in the light mixing structure, there are:

θ _c ＝arcsin(n ₀ /n)-------------------------------(2)

to ensure that the light can be totally reflected on the inclined plane of each section, the light source comprises

∠1、∠2、∠3、∠4>θ _c

The terms 1, 2, 3 and 4 can be expressed as:

∠1＝∠4＝π-θ/2+α>θ _c ---------------------(3)

∠2＝∠3＝θ-π-θ/2-α>θ _c -----------------(4)

formulas (1) - (4) are boundary conditions for converting incident light rays of the light mixing structure into transverse propagation in the light mixing cavity, and the design of the inclined plane angle can be carried out according to the design requirement.

If n ₀ =1, n=1.51, θ _c 41.47 °; further represented by the formulas (1) to (4),

it can be obtained that θ, α needs to satisfy:

82.94°<θ<180°

0°<α<7.06°

the first and second emission regions 22 and 23 are the same or different, one of which is θ' and the target emission angle θ _out The following relationship is provided:

can be combined with theta' and theta according to the formula (5) _out Finding the angle of the exit microstructure

Exit plane and theta' and target exit angle theta _out The following relationship is provided:

n·sinθ′＝n ₀ ·sin(θ _out )-----------------(6)

it will be apparent that the embodiments described above are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The light mixing structure is characterized by comprising a light mixing cavity surrounded by a light inlet surface (10), a light outlet surface (20) and two side surfaces (30), wherein the light inlet surface (10) and the light outlet surface (20) are arranged oppositely,

the light-emitting surface (20) comprises a total reflection area (21), a first light-emitting area (22) and a second light-emitting area (23), the total reflection area (21) is positioned between the first light-emitting area (22) and the second light-emitting area (23),

at least part of incident light enters the light mixing cavity from the light incident surface (10), and then propagates along a first direction (40) and a second direction (50) after passing through the total reflection area (21), and finally is emitted from the first emission area (22) and the second emission area (23) respectively, wherein the first direction (40) is opposite to the second direction (50), and the direction of the Y component of the first direction (40) is the same as that of the at least part of incident light.

2. The light mixing structure according to claim 1, wherein the first direction (40) and the second direction (50) are both perpendicular to the thickness direction of the light mixing structure.

3. The light mixing structure according to claim 1, wherein the light incident surface (10) comprises an incident area (11), a first reflective area (12) and a second reflective area (13), the incident area (11) is located between the first reflective area (12) and the second reflective area (13), the incident area (11) and the total reflective area (21), the first reflective area (12) and the first exit area (22), the second reflective area (13) and the second exit area (23) are arranged opposite to each other, and light rays transmitted in the first direction (40) after passing through the total reflective area (21) are reflected to the first exit area (22) by the first reflective area (12), and light rays transmitted in the second direction (50) after passing through the total reflective area (21) are reflected to the second exit area (23) by the second reflective area (13).

4. A light mixing structure according to claim 3, characterized in that the entrance area (11), the first reflection area (12), the second reflection area (13), the total reflection area (21), the first exit area (22) and the second exit area (23) form a set of light mixing elements, the light mixing structure comprising a plurality of sets of light mixing elements, the plurality of sets of light mixing elements being arranged in sequence in the first direction (40) and/or the second direction (50).

5. A light mixing structure according to claim 3, characterized in that the entrance area (11) is planar.

6. A light mixing structure according to claim 3, wherein the total reflection area (21) comprises a first total reflection surface (211) and a second total reflection surface (212), the first total reflection surface (211) is connected with the second total reflection surface (212) at an angle, the distance between the first total reflection surface (211) and the second total reflection surface (212) is gradually reduced along a direction away from the light incident surface (10), a part of light rays incident by the incidence area (11) are sequentially transmitted along the first direction (40) after being totally reflected by the first total reflection surface (211) and the second total reflection surface (212), and another part of light rays incident by the incidence area (11) are sequentially transmitted along the second direction (50) after being totally reflected by the second total reflection surface (212) and the first total reflection surface (211).

7. The light mixing structure according to claim 6, wherein an angle between the first total reflection surface (211) and the second total reflection surface (212) is 30 ° or more and 150 ° or less.

8. A light mixing structure according to claim 3, characterized in that the first reflective area (12) comprises a first reflective surface (121) and a second reflective surface (122) connected at an angle, the distance between the first reflective surface (121) and the second reflective surface (122) gradually decreasing in a direction away from the light exit surface (20), the first reflective surface (121) being adapted to receive light rays of the total reflective area (21), the second reflective surface (122) being adapted to receive light rays of the first reflective surface (121), the second reflective area (13) comprising a third reflective surface (131) and a fourth reflective surface (132) connected at an angle, the distance between the third reflective surface (131) and the fourth reflective surface (132) gradually decreasing in a direction away from the light exit surface (20), the third reflective surface (131) being adapted to receive light rays of the total reflective area (21), the fourth reflective surface (132) being adapted to receive light rays of the third reflective surface (131), the third reflective surface (131) being connected to both sides of the first reflective surface (121) and the fourth reflective surface (132) being connected to the light rays of the light ray (11),

an angle between the first reflecting surface (121) and the second reflecting surface (122) is 30 DEG or more and 150 DEG or less; and/or

An angle between the third reflecting surface (131) and the fourth reflecting surface (132) is 30 DEG or more and 150 DEG or less.

9. The light mixing structure of claim 1, wherein,

the first emergent area (22) is a microstructure formed by sequentially connecting plane or multi-section sections in an angle manner; and/or

The second emergent area (23) is a microstructure formed by connecting planar or multi-section sections in sequence at an angle.

10. A light mixing structure according to claim 9, characterized in that when the first exit area (22) and/or the second exit area (23) are planar, a micro lens array (24) is arranged on the planar surface.

11. A light mixing structure according to claim 9, characterized in that when the first (22) and/or the second (23) exit area are microstructures, at least one facet of the microstructures is provided with a micro lens array (24).