CN219349280U - Light mixing element - Google Patents
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- CN219349280U CN219349280U CN202320209003.0U CN202320209003U CN219349280U CN 219349280 U CN219349280 U CN 219349280U CN 202320209003 U CN202320209003 U CN 202320209003U CN 219349280 U CN219349280 U CN 219349280U
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Abstract
The utility model provides a light mixing element. The light mixing element comprises a light inlet surface, a light outlet surface, a first side surface and a second side surface, one side of the light inlet surface is connected with one side of the light outlet surface through the first side surface, the other side of the light inlet surface is connected with the other side of the light outlet surface through the second side surface, and the light inlet surface, the light outlet surface, the first side surface and the second side surface enclose a light mixing cavity; the light-emitting surface is provided with a microstructure, and the microstructure comprises a total reflection microstructure and an emergent microstructure; at least part of incident light enters the light mixing cavity from the light incident surface, propagates along the first direction after being totally reflected by the total reflection microstructure, finally exits from the exit microstructure, and the Y component direction of at least part of the incident light is opposite to the first direction. The utility model solves the problems that the light and thin light mixing element in the prior art is difficult to simultaneously achieve the light mixing effect.
Description
Technical Field
The utility model relates to the technical field of light homogenizing equipment, in particular to a light mixing element.
Background
At present, devices applied to the optical field are updated along with the demands of users, such as wearing devices like AR/VR, miniature projection modules, eyeball tracking modules, unmanned aerial vehicle light supplementing modules and the like, and miniature optical elements and modules become the necessary requirements of some products, so that the modules are required to achieve the target requirements of light control within the range of the minimum volume, area and length, and thus, new challenges are presented to optical design.
The light mixing element needs a larger space to uniformly mix light with different wavelengths so as to achieve the purpose of uniform spatial color distribution. Mixing light in a very small volume is always a difficult problem in the field of illumination, the mixing light needs space, and the traditional mixing light mode comprises the following steps: the principle of the diffuse reflection light mixing cavity, the light guide column and the like is that light beams are reflected and mixed for multiple times in space so as to achieve the effect that emergent light is a light field with uniform color space distribution, and the modes all need to have enough volume or length, which is not beneficial to the reduction of the volume of a module.
That is, the light-mixing element in the prior art has the problem that the light and thin performance and the light-mixing effect are difficult to be simultaneously achieved.
Disclosure of Invention
The utility model mainly aims to provide a light mixing element so as to solve the problem that the light mixing element in the prior art is light and thin and has difficult light mixing effect.
In order to achieve the above objective, the present utility model provides a light mixing element, which includes a light incident surface, a light emergent surface, a first side surface and a second side surface, wherein one side of the light incident surface is connected with one side of the light emergent surface through the first side surface, the other side of the light incident surface is connected with the other side of the light emergent surface through the second side surface, and the light incident surface, the light emergent surface, the first side surface and the second side surface enclose a light mixing cavity; the light-emitting surface is provided with a microstructure, and the microstructure comprises a total reflection microstructure and an emergent microstructure; at least part of incident light enters the light mixing cavity from the light incident surface, propagates along the first direction after being totally reflected by the total reflection microstructure, finally exits from the exit microstructure, and the Y component direction of at least part of the incident light is opposite to the first direction.
Further, the total reflection microstructure and the emergent microstructure are sequentially arranged along the first direction.
Further, the first direction is perpendicular to the thickness direction of the light-mixing element.
Further, the total reflection microstructure includes a plurality of total reflection surfaces, and a plurality of total reflection surfaces are connected in order along the first direction, and two adjacent total reflection surfaces in a plurality of total reflection surfaces are the angle setting, and at least some incident light is propagated along the first direction after being reflected by a plurality of total reflection surfaces in proper order along the opposite direction of first direction.
Further, the total reflection microstructure sequentially comprises a first total reflection surface, a second total reflection surface and a third total reflection surface which are connected in an angle manner along the opposite direction of the first direction, and at least part of incident light is transmitted along the first direction after being sequentially reflected by the first total reflection surface, the second total reflection surface and the third total reflection surface.
Further, the emergent microstructure comprises an emergent surface and an auxiliary surface, the auxiliary surface and the emergent surface are connected in an angle along a first direction, and the distance between the auxiliary surface and the emergent surface in the first direction is gradually reduced along a direction away from the light incident surface.
Further, the auxiliary surface and the emergent surface are connected at an acute angle.
Further, the total reflection microstructure is provided with a total reflection point, at least part of incident light rays are transmitted along a first direction after passing through the total reflection point, the emergent microstructure is provided with an emergent point, and the distance between the total reflection point and the emergent point, the reflection times of at least part of the incident light rays on the incident surface, the thickness of the light mixing element and the incident angle of at least part of the incident light rays on the incident surface meet the linear relation.
Further, the light incident surface is one of a plane, an inclined surface and a curved surface.
Further, the thickness of the light mixing element is more than 0.005mm and less than 50mm; and/or the volume of the light mixing element is greater than 0.02mm 3 And is smaller than 200000mm 3 。
By applying the technical scheme of the utility model, the light mixing element comprises a light inlet surface, a light outlet surface, a first side surface and a second side surface, one side of the light inlet surface is connected with one side of the light outlet surface through the first side surface, the other side of the light inlet surface is connected with the other side of the light outlet surface through the second side surface, and the light inlet surface, the light outlet surface, the first side surface and the second side surface enclose a light mixing cavity; the light-emitting surface is provided with a microstructure, and the microstructure comprises a total reflection microstructure and an emergent microstructure; at least part of incident light enters the light mixing cavity from the light incident surface, propagates along the first direction after being totally reflected by the total reflection microstructure, finally exits from the exit microstructure, and the Y component direction of at least part of the incident light is opposite to the first direction.
The light-emitting surface is provided with a microstructure, and the microstructure comprises a total reflection microstructure and an emergent microstructure; at least part of incident light enters the light mixing cavity from the light inlet surface, is transmitted along the first direction after being totally reflected by the total reflection microstructure, and finally is emitted from the light emitting microstructure, and the Y component direction of at least part of incident light is opposite to the first direction, so that the light is emitted from the light emitting microstructure after being repeatedly reflected in the first direction in the light mixing cavity, at the moment, the light emitting direction of the light emitted from the light emitting microstructure is different from the first direction, that is, the light transmitting direction in the light mixing cavity is equivalent to being perpendicular to the light emitting direction, and the total reflection microstructure and the light emitting microstructure are both positioned on the light emitting surface, and the thickness of the light mixing element is taken as the light cavity, so that the volume of the light mixing element is further compressed, the light mixing element is miniaturized, thinned and applied to portable small-sized products.
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 illustrates an optical path diagram of a light mixing element according to an alternative embodiment of the present utility model;
FIG. 2 is a schematic diagram of the incident light and the emergent light of FIG. 1;
FIG. 3 shows an optical path diagram of the total reflection microstructure of FIG. 1;
FIG. 4 shows a detailed view of the optical path profile of FIG. 1;
FIG. 5 is a graph showing the relationship between the total reflection point and the exit point of the light mixing element of the present utility model;
FIG. 6 shows an optical path diagram of an exit microstructure of the light mixing element of the present utility model;
fig. 7 shows an optical path diagram of one state of the light mixing element of the present utility model;
fig. 8 shows an optical path diagram of another state of the light mixing element of the present utility model.
Wherein the above figures include the following reference numerals:
10. a light incident surface; 20. a light-emitting surface; 21. a total reflection microstructure; 211. a first total reflection surface; 212. a second total reflection surface; 213. a third total reflection surface; 22. an exit microstructure; 221. an exit surface; 222. an auxiliary surface; 30. a first side; 40. a second side; 50. a light source.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in 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 application 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.
In order to solve the problem that the light and thin light mixing element in the prior art is difficult to achieve the light mixing effect at the same time, the utility model provides the light mixing element.
As shown in fig. 1 to 8, the light mixing element includes a light incident surface, a light emergent surface, a first side surface and a second side surface, one side of the light incident surface is connected with one side of the light emergent surface 20 through the first side surface 30, the other side of the light incident surface 10 is connected with the other side of the light emergent surface 20 through the second side surface 40, and the light incident surface 10, the light emergent surface 20, the first side surface 30 and the second side surface 40 enclose a light mixing cavity; the light emergent surface 20 is provided with a microstructure, and the microstructure comprises a total reflection microstructure 21 and an emergent microstructure 22; at least part of incident light enters the light mixing cavity from the light incident surface 10, propagates along the first direction after being totally reflected by the total reflection microstructure 21, and finally exits from the exit microstructure 22, wherein the Y component direction of at least part of the incident light is opposite to the first direction.
The light emergent surface 20 is provided with a microstructure, and the microstructure comprises a total reflection microstructure 21 and an emergent microstructure 22; at least part of incident light enters the light mixing cavity from the light incident surface 10, is transmitted along the first direction after being totally reflected by the total reflection microstructure 21, and finally is emitted from the light emitting microstructure 22, and the Y component direction of at least part of incident light is opposite to the first direction, so that the light is emitted from the light emitting microstructure 22 after being repeatedly reflected in the first direction in the light mixing cavity, at the moment, the light emitting direction of the light emitted from the light emitting microstructure 22 is different from the first direction, that is, the light transmitting direction in the light mixing cavity is equivalent to being perpendicular to the light emitting direction, and the total reflection microstructure 21 and the light emitting microstructure 22 are both positioned on the light emitting surface 20, and the light is transmitted to the light emitting microstructure 22 by the total reflection microstructure 21, namely, the thickness of the light mixing element is taken as a light cavity, thereby being beneficial to further compressing the volume of the light mixing element, and being beneficial to applying the light mixing element in portable small-sized and light-thin products.
As shown in fig. 1 and 2 (the specific shapes of the total reflection microstructure 21 and the exit microstructure 22 are not shown in fig. 1), the total reflection microstructure 21 and the exit microstructure 22 are sequentially arranged along the first direction. The first direction is perpendicular to the thickness direction of the light mixing element. The light source 50 is configured to provide an incident light, wherein a part of the incident light transmitted downward enters the light mixing cavity from the light incident surface 10, then enters the total reflection microstructure 21, propagates in the first direction in the light mixing cavity after being transmitted by total reflection of the total reflection microstructure 21, and has a direction opposite to a Y component of the incident light, the Y component of the incident light faces downward, and the first direction faces upward, and then exits after reaching a target exit point, so that an exit position and an exit angle of the light on the light exit surface 20 of the light mixing element are changed, thereby achieving the purpose of light mixing.
Specifically, the light incident surface 10 is an interface where incident light is refracted by a medium and enters the light mixing element, and the light incident surface 10 may be a plane or may be designed as an inclined plane or a curved plane according to requirements. In this application, a plane is preferred.
Specifically, the thickness of the light mixing element is more than 0.005mm and less than 50mm; preferably, the thickness of the light mixing element is greater than 0.01mm and less than 20mm; the volume of the light mixing element is larger than 0.02mm 3 And is smaller than 200000mm 3 . Through reasonable planning of thickness and volume of the light mixing element, the size of the light mixing element is limited in a smaller range on the premise of guaranteeing the light mixing effect of the light mixing element, so that the light and thin performance and miniaturization of the light mixing element are guaranteed, and the light and thin type light mixing element is conveniently applied to small-sized equipment.
As shown in fig. 3 and 4, the function of the total reflection microstructure 21 is to turn the direction of the incident light, so that the total reflection light beam propagates in the first direction; the total reflection microstructure 21 includes a plurality of total reflection surfaces, the plurality of total reflection surfaces are sequentially connected along a first direction, two adjacent total reflection surfaces among the plurality of total reflection surfaces are arranged at an angle, and at least part of incident light rays are sequentially reflected by the plurality of total reflection surfaces along a direction opposite to the first direction and then are propagated along the first direction. The first side 30 is close to the emergent microstructure 22 relative to the second side 40, so that the first side 30 is located above the second side 40 and is parallel to the second side 40, and the arrangement is such that the incident light is firstly incident on one total reflection surface closest to the first side 30, then is totally reflected towards other total reflection surfaces close to the second side 40 for transmission, finally is totally reflected onto the incident surface 10 through the total reflection surface closest to the second side 40, thereby realizing the direction adjustment of the incident light, and finally is transmitted towards the first direction.
As shown in fig. 3, the total reflection microstructure 21 sequentially includes a first total reflection surface 211, a second total reflection surface 212, and a third total reflection surface 213 that are connected by angles in a direction opposite to the first direction, that is, the first total reflection surface 211, the second total reflection surface 212, and the third total reflection surface 213 are connected by angles in a direction away from the first side 30, and at least part of incident light is sequentially transmitted in the first direction after being totally reflected by the first total reflection surface 211, the second total reflection surface 212, and the third total reflection surface 213.
As shown in fig. 3, where θ is the angle at which the incident light is refracted into the light mixing element, α, β, γ are the angles (0 < α, β, γ < pi/2) between the first total reflection surface 211, the second total reflection surface 212, and the third total reflection surface 213 and the horizontal line, and angle 1, < 2, and angle 3 are the angles of incidence on the first total reflection surface 211, the second total reflection surface 212, and the third total reflection surface 213, respectively.
θ' is the incident angle of the light ray entering the light incident surface 10 after being totally reflected by the third total reflection surface 213, and the geometric relationship can be known:
θ’＝2α+2β-2γ-θ-π/2----------------------------(1)
to allow the totally reflected light to continue to propagate in the first direction in the light mixing element, it is necessary to have
θ’>θc，θc＝arcsin(n0/n)-------------------------------(2)
At the same time, in order to ensure that the light rays can be totally reflected on the first total reflection surface 211, the second total reflection surface 212 and the third total reflection surface 213, there are
∠1、∠2、∠3>θc；
The terms 1, 2 and 3 can be expressed as:
∠1＝90-α+θ>θc----------------------------------(3)
∠2＝2α+β-θ-π/2>θc----------------------------(4)
∠3＝3π/2-2α-2β+γ+θ>θc----------------------(5)
equations (1) - (5) are boundary conditions for converting the incident light of the light mixing element into the first direction propagation inside the light mixing cavity, and the angles of the first total reflection surface 211, the second total reflection surface 212 and the third total reflection surface 213 can be designed according to the design requirement.
n0 is the refractive index of the outside, n is the refractive index of the material of the light mixing element, if n0=1, n=1.51, θc≡ 41.47 °; and then the value ranges and the relation which are required to be satisfied by alpha, beta and gamma can be obtained by the formulas (1) - (5):
40.735°<α<88.53°；
171.47°-2α<β<90°；
2α+2β-268.53°<γ<90°；
45°<β-γ；
for example: when θ=40°, α=60°, β=75°, γ=2°, and the angle θ' =46° between the light rays after multiple total reflections incident on the light incident surface 10 satisfies the total reflection condition. As shown in fig. 3, the light propagates in the light mixing element along the first direction after being totally reflected by the first total reflection surface 211, the second total reflection surface 212 and the third total reflection surface 213, and the first direction is opposite to the Y component direction of the incident light.
As shown in fig. 6, the function of the emitting microstructure 22 is to refract the light in the light mixing element into another medium, that is, to refract the light mixing element into the outside; the emitting microstructure 22 includes an emitting surface 221 and an auxiliary surface 222, where the auxiliary surface 222 and the emitting surface 221 are connected at an angle along a first direction, that is, the emitting surface 221 is close to the first side 30 relative to the auxiliary surface 222, and a distance between the auxiliary surface 222 and the emitting surface 221 in the first direction gradually decreases along a direction away from the light incident surface 10, so that the auxiliary surface 222 and the emitting surface 221 form a triangle-like structure. Preferably, the auxiliary surface 222 and the exit surface 221 are connected at an acute angle. Of course, the angle between the auxiliary surface 222 and the exit surface 221 may be adjusted according to the thickness of the light mixing element and the exit point of the light. This is arranged such that light transmitted in the first direction within the light mixing element is finally emitted to the outside from the emitting surface 221, to achieve the light mixing effect.
As shown in fig. 5, the total reflection microstructure 21 has a total reflection point, at least part of the incident light propagates along the first direction after passing through the total reflection point, the exit microstructure 22 has an exit point, and the distance s between the total reflection point and the exit point, the reflection number m of at least part of the incident light on the light incident surface 10, the thickness d of the light mixing element, and the incident angle θ' of at least part of the incident light transmitted along the first direction satisfy a linear relationship.
The light returns from the total reflection point to the light mixing cavity, propagates to the exit point after multiple total reflections in the light mixing cavity, and if the light is reflected m times on the light incident surface 10, the distance s between the exit point and the total reflection point can be calculated by the formula:
s＝2m*(d*tanθ’)-------------------------------(6)
wherein m is an integer, and the appropriate value of m can be selected according to the size, design requirement and other factors of the light mixing element, so that s is in the target range. M and d can also be adjusted to meet the exact requirements for s.
The design of the emission microstructure 22 is shown in fig. 6, and the emission microstructure 22 has the following relationship with θ' and the target emission angle θout:
the angle between the exit surface 221 of the exit microstructure 22 and the horizontal line can be determined according to equation (7) in combination with θ' and θout
As shown in fig. 7, the light is emitted from the light emitting surface 20, and the light beam with a specific incident angle is mixed with the light of other emission angles of the light source 50 by changing the emission point and the emission angle after passing through the light mixing element, so as to achieve the purpose of mixing light.
As shown in fig. 8, of course, the emitting microstructure 22 may also be disposed on the light incident surface 10, the light is emitted from the light incident surface 10, the light source 50 enters the light mixing element at a specific angle, the light propagates in the light mixing element for a certain distance, and then is refracted out of the light mixing element through the emitting microstructure 22 of the light incident surface 10, and the light is turned around in the X, Y axis.
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 example embodiments in accordance with the present application. 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 claims of the present application 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 present application described herein may be implemented in sequences other than those illustrated or 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 (10)
1. The light mixing element is characterized by comprising a light entering surface (10), a light exiting surface (20), a first side surface (30) and a second side surface (40), wherein one side of the light entering surface (10) is connected with one side of the light exiting surface (20) through the first side surface (30), the other side of the light entering surface (10) is connected with the other side of the light exiting surface (20) through the second side surface (40), and a light mixing cavity is formed by the light entering surface (10), the light exiting surface (20), the first side surface (30) and the second side surface (40) in an enclosing mode;
the light emitting surface (20) is provided with a microstructure, and the microstructure comprises a total reflection microstructure (21) and an emitting microstructure (22); at least part of incident light enters the light mixing cavity from the light incident surface (10), propagates along a first direction after being totally reflected by the total reflection microstructure (21), and finally exits from the emergent microstructure (22), wherein the Y component direction of at least part of the incident light is opposite to the first direction.
2. The light-mixing element according to claim 1, characterized in that the total reflection microstructure (21) and the exit microstructure (22) are arranged in sequence along the first direction.
3. The light-mixing element according to claim 1, wherein the first direction is perpendicular to a thickness direction of the light-mixing element.
4. The light mixing element according to claim 1, wherein the total reflection microstructure (21) comprises a plurality of total reflection surfaces, the plurality of total reflection surfaces are sequentially connected along the first direction, two adjacent total reflection surfaces among the plurality of total reflection surfaces are arranged at an angle, and at least part of incident light rays are sequentially reflected by the plurality of total reflection surfaces along the opposite direction of the first direction and then propagate along the first direction.
5. The light mixing element according to claim 4, wherein the total reflection microstructure (21) comprises a first total reflection surface (211), a second total reflection surface (212) and a third total reflection surface (213) which are connected in an angle in order along the opposite direction of the first direction, and the at least part of the incident light rays propagate along the first direction after being reflected by the first total reflection surface (211), the second total reflection surface (212) and the third total reflection surface (213) in order.
6. The light-mixing element according to claim 1, characterized in that the exit microstructure (22) comprises an exit surface (221) and an auxiliary surface (222), the auxiliary surface (222) and the exit surface (221) are connected at an angle along the first direction, and the distance of the auxiliary surface (222) and the exit surface (221) in the first direction decreases gradually in a direction away from the light-entering surface (10).
7. A light-mixing element according to claim 6, characterized in that the auxiliary surface (222) and the exit surface (221) are connected at an acute angle.
8. The light-mixing element according to claim 1, wherein the total-reflection microstructure (21) has a total reflection point, the at least part of the incident light rays propagate along the first direction after passing through the total-reflection point, the exit microstructure (22) has an exit point, and the distance between the total-reflection point and the exit point, the number of reflections of the at least part of the incident light rays on the light-entering surface (10), the thickness of the light-mixing element and the incident angle of the at least part of the incident light rays on the light-entering surface (10) satisfy a linear relationship.
9. The light-mixing element according to claim 1, wherein the light-entering surface (10) is one of a plane, an inclined surface and a curved surface.
10. The light-mixing element of claim 1, wherein,
the thickness of the light mixing element is more than 0.005mm and less than 50mm; and/or
The volume of the light mixing element is larger than 0.02mm 3 And is smaller than 200000mm 3 。
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