CN216792482U - Light uniformizing element - Google Patents
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- CN216792482U CN216792482U CN202220218531.8U CN202220218531U CN216792482U CN 216792482 U CN216792482 U CN 216792482U CN 202220218531 U CN202220218531 U CN 202220218531U CN 216792482 U CN216792482 U CN 216792482U
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Abstract
The utility model provides a light uniformizing element. The dodging component is a sheet structure, the dodging component comprises a transparent substrate, a first adhesive layer and a second adhesive layer, the first adhesive layer and the second adhesive layer are arranged on two opposite sides of the transparent substrate, the first adhesive layer is provided with a light incoming surface, the second adhesive layer is provided with a light outgoing surface, the light incoming surface is a cylindrical free-form surface, a plurality of concave surfaces and a plurality of convex surfaces are arranged in the cylindrical free-form surface, one concave surface is connected with one convex surface and forms a micro-lens unit in smooth transition, large-angle diffusion of light beams is achieved, the light outgoing surface is a Fresnel surface, the Fresnel surface is provided with a Fresnel structure, and collimation or convergence of the light beams are achieved. The utility model solves the problem of low product yield of the light homogenizing sheet in the prior art.
Description
Technical Field
The utility model relates to the technical field of optical equipment, in particular to a light homogenizing element.
Background
The mainstream 3D sensing technical solutions in the market are three: binocular Vision, Structured Light, and Time of Flight (ToF). The binocular precision is low, the structured light structure is complex and high in cost, the TOF has enough precision and low cost, and the trend of popularization is achieved. TOF is usually composed of a transmitting end and a receiving end, wherein the transmitting end is mainly composed of a Vcsel light source and a light homogenizer (diffuiser).
The common structure of the light homogenizing sheet is mainly formed by arraying concave or convex micro lens units according to a certain period or randomly, and correspondingly, the micro lens units are connected by sharp corners and are in a sharp bottom or sharp top shape. In the actual manufacturing process of the product, because of the influence of the optical proximity effect of the photoetching process, the sharp corner is easy to become a fillet, and the surface shape is difficult to be accurately matched with the design, so that the product performance can not meet the specification; and when the stencil is printed, the sharp corner is easy to form residual glue, which results in the reduction of the service life of the stencil and the reduction of the product yield. The current optical design of a wide scattering angle uniform light sheet, such as about 120 degrees, is mainly realized by increasing the design aspect ratio of the curved surface of the lens or selecting high-refractive-index stamping glue. Because the light diffraction at the sharp bottom structure of the convex master plate is more easily limited, the concave master plate is often adopted in the photoetching process, but the total reflection of light between adjacent micro lenses is easy to occur due to the improvement of the depth-to-width ratio of the curved surface design of the lens, so that the original light path trend is changed, and the light spot of the illuminated surface is partially bright.
That is to say, the light homogenizing sheet in the prior art has the problem of low product yield.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a light homogenizing element to solve the problem that a light homogenizing sheet in the prior art is low in product yield.
In order to achieve the above object, according to one aspect of the present invention, a light homogenizing element is provided, the light homogenizing element is a sheet structure, the light homogenizing element includes a transparent substrate, and a first adhesive layer and a second adhesive layer disposed on two opposite sides of the transparent substrate, the first adhesive layer has a light incident surface, the second adhesive layer has a light emitting surface, the light incident surface is a cylindrical free-form surface, the cylindrical free-form surface has a plurality of concave surfaces and a plurality of convex surfaces, one concave surface is connected with one convex surface and is in smooth transition to form a micro lens unit, so as to implement large-angle diffusion of light beams, the light emitting surface is a fresnel surface, and the fresnel surface has a fresnel structure, so as to implement collimation or convergence of light beams.
Further, the extension direction of the microlens unit is perpendicular to the extension direction of the fresnel structure.
Further, the junction of the concave surface and the convex surface has the same curvature.
Further, the convex surface in the microlens unit is turned 180 degrees and then arranged in proportion to the concave surface.
Further, the ratio between the concave surface and the convex surface is greater than 0 and less than 2.67.
Further, the columnar free-form surface has a plurality of microlens units, and the ratio of concave surfaces to convex surfaces in the plurality of microlens units is the same; or the ratio of concave to convex in at least two microlens elements is different.
Further, the distance between two adjacent convex surfaces is greater than 1 micrometer and less than or equal to 800 micrometers.
Further, the width of the concave surface is more than or equal to 4 micrometers and less than or equal to 400 micrometers; and/or the height of the concave surface is greater than or equal to 3.45 micrometers and less than or equal to 345 micrometers.
Further, the width of the convex surface is more than or equal to 1.5 micrometers and less than or equal to 400 micrometers; and/or the height of the convex surface is greater than or equal to 1.29 micrometers and less than or equal to 345 micrometers.
Further, the Fresnel structure is provided with a plurality of tooth structures, and the maximum tooth height in the tooth structures is more than or equal to 3 micrometers and less than or equal to 300 micrometers; and/or the maximum pitch in the tooth structure is greater than or equal to 10 micrometers and less than or equal to 1000 micrometers.
Further, the refractive index of the first adhesive layer and the second adhesive layer to yellow light of 589nm is greater than or equal to 1.4 and less than or equal to 1.6.
Further, the horizontal scattering angle corresponding to the dodging element is larger than 100 degrees and smaller than 150 degrees; and/or the vertical scattering angle corresponding to the light homogenizing element is greater than 5 degrees and less than 15 degrees.
By applying the technical scheme of the utility model, the light homogenizing element is of a sheet structure and comprises a transparent substrate, and a first adhesive layer and a second adhesive layer which are arranged on two opposite sides of the transparent substrate, wherein the first adhesive layer is provided with a light inlet surface, the second adhesive layer is provided with a light outlet surface, the light inlet surface is a cylindrical free curved surface, a plurality of concave surfaces and a plurality of convex surfaces are arranged in the cylindrical free curved surface, one concave surface is connected with one convex surface and is in smooth transition to form a micro lens unit, so that large-angle diffusion of light beams is realized, the light outlet surface is a Fresnel surface, and the Fresnel surface is provided with a Fresnel structure so as to realize collimation or convergence of the light beams.
The light incident surface of the dodging element is set to be a cylindrical free-form surface, and the convex surface and the concave surface on the light incident surface are in smooth transition instead of sharp-angle connection, so that the residual glue is reduced and left on the template, and the yield of the dodging element is effectively increased. Meanwhile, when the dodging element is designed, the concave surface and the convex surface are in smooth transition with continuous curvature, so that the reproduction and matching of a subsequent processing technology to the design surface type are facilitated, and the yield of the dodging element and the dodging effect of the dodging element are effectively ensured. The concave surface can realize the syntropy diffusion to the light, and the convex surface can realize the cross diffusion to the light so that the diffusion to the light beam can be realized to the column free curved surface, and fresnel surface can realize the collimation or the convergence to the light beam, through the design to the face type of income plain noodles and play plain noodles, makes the even distribution of back light through even light component emergence within the angle scope of design, realizes the even light effect of target.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 shows a schematic structural view of a light unifying element of an alternative embodiment of the present invention;
FIG. 2 shows a cross-sectional view of the light unifying element in FIG. 1 in a horizontal direction;
FIG. 3 shows a cross-sectional view of the light unifying element of FIG. 1 in a vertical direction;
FIG. 4 shows a schematic view of another angled configuration of the light unifying element of FIG. 1;
FIG. 5 is a schematic diagram showing the optical path of the dodging element of FIG. 1 in a horizontal direction;
FIG. 6 shows a schematic diagram of the optical path of the light unifying element of FIG. 1 in the vertical direction;
FIG. 7 is a schematic diagram showing the light path in the horizontal direction in an alternative embodiment in which the convex surfaces of the microlens units in the dodging element are periodically arranged after being reduced by the concave surfaces;
FIG. 8 is a schematic diagram showing the horizontal direction light paths of the microlens units in the dodging element in an alternative embodiment, wherein the convex surfaces of the microlens units are periodically arranged after being enlarged by the concave surfaces;
FIG. 9 is a schematic diagram showing the optical paths in the horizontal direction in which the microlens units in the dodging element are randomly arranged in an alternative embodiment;
FIG. 10 is a schematic diagram showing the optical paths of a simplified model of the microlens elements of an optional embodiment of the dodging element;
FIG. 11 shows a light intensity distribution curve of an alternative embodiment of the light unifying element;
FIG. 12 illustrates a spot pattern projected onto an illuminated surface by an alternate embodiment of the light homogenizing element.
Wherein the figures include the following reference numerals:
10. a light incident surface; 11. a concave surface; 12. a convex surface; 20. a light-emitting surface; 21. and (4) a tooth structure.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, 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.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the utility model.
The utility model provides a light homogenizing element, aiming at solving the problem that the product yield of a light homogenizing sheet in the prior art is low.
As shown in fig. 1 to 12, the light equalizing element is a sheet structure, and includes a transparent substrate, and a first adhesive layer and a second adhesive layer disposed on two opposite sides of the transparent substrate, where the first adhesive layer has a light incident surface 10, the second adhesive layer has a light emitting surface 20, the light incident surface 10 is a cylindrical free-form surface, the cylindrical free-form surface has a plurality of concave surfaces 11 and a plurality of convex surfaces 12, one concave surface 11 is connected with one convex surface 12 and is in smooth transition to form a micro-lens unit, so as to implement large-angle diffusion of light beams, the light emitting surface 20 is a fresnel surface, and the fresnel surface has a fresnel structure, so as to implement collimation or convergence of light beams.
The light incident surface 10 of the light homogenizing element is set to be a cylindrical free-form surface, and the convex surface 12 and the concave surface 11 on the light incident surface 10 are in smooth transition instead of sharp-angle connection, so that the residual glue is reduced to be left on a template, and the yield of the light homogenizing element is effectively increased. Meanwhile, when the dodging element is designed, the concave surface 11 and the convex surface 12 are in smooth transition with continuous curvature, so that the reproduction and matching of a subsequent processing technology to a designed surface type are facilitated, and the yield of the dodging element and the dodging effect of the dodging element are effectively ensured. The concave surface 11 can realize the equidirectional diffusion of light, the convex surface 12 can realize the cross diffusion of light so that the cylindrical free-form surface can realize the diffusion of light beams, the Fresnel surface can realize the collimation or convergence of the light beams, and the light beams can be uniformly distributed in the designed angle range after being emitted by the light uniformizing element through the design of the surface types of the light incident surface 10 and the light emergent surface 20, so that the target light uniformizing effect is realized.
It should be noted that the concave surface 11 and the convex surface 12 are both elongated, i.e., columnar.
As shown in fig. 1 and 4, the extending direction of the microlens unit is perpendicular to the extending direction of the fresnel structure. When the light reaches the columnar free curved surface, the light is influenced by the structure on the columnar free curved surface to reach a required deflection angle, so that the light is deflected in the horizontal direction after being emitted, and the light diffusion effect is realized. When light passes through the Fresnel surface, the light is deflected towards the vertical direction under the influence of the Fresnel structure, so that the light collimation or convergence effect is realized, and the independent control of the horizontal light field and the vertical light field is realized.
Specifically, the arrangement direction of the microlens units is a horizontal direction, and the extension direction of the microlens units is a vertical direction.
Specifically, the junction of the concave surface 11 and the convex surface 12 has the same curvature. That is, the concave surface 11 and the convex surface 12 are connected to form a straight line. The arrangement ensures that the concave surface 11 and the convex surface 12 are in smooth transition, and a sharp-angled structure is not formed at the joint of the concave surface 11 and the convex surface 12, so that the forming of the dodging structure is ensured, and the yield of dodging elements is effectively ensured.
Specifically, the convex surface 12 in the microlens unit is turned 180 degrees and then arranged in proportion to the concave surface 11. The convex surface 12 is formed by reducing or enlarging the three-dimensional structure of the concave surface 11 in equal proportion according to a certain numerical value and then turning over, and the critical value (maximum value or minimum value) of the scaling is related to the light source light distribution and the target light distribution so as to meet the requirement that the total reflection of light cannot occur between adjacent curved surfaces, effectively reduce the light loss and ensure the light propagation efficiency.
Of course, the three-dimensional structure with the concave surface 11 as the convex surface 12 may be formed by scaling down or enlarging the three-dimensional structure according to a certain numerical value and then turning over.
Specifically, the ratio between the concave surface 11 and the convex surface 12 is greater than 0 and less than 2.67. If the ratio between the concave surface 11 and the convex surface 12 is greater than 2.67, the ratio between the convex surface 12 and the concave surface 11 is too large, the light incident from the convex surface 12 may be totally reflected or refracted at the concave surface 11 after being refracted, which is not favorable for matching between the light distribution of the dodging element and the light distribution of the light source and the target light distribution. And the proportion between the concave surface 11 and the convex surface 12 is limited within the range of 0 to 2.67, so that the matching between the light distribution of the dodging element and the light source and the target light distribution can be effectively ensured.
As shown in fig. 7 and 8, the columnar free-form surface has a plurality of microlens units in which the ratio of the concave surface 11 to the convex surface 12 is the same. That is to say, a plurality of microlens units are arranged in a periodic array, which is beneficial to the processing and manufacturing of the columnar free-form curved surface.
As shown in fig. 9, it is also possible to have a form in which the ratio of the concave surface 11 to the convex surface 12 in at least two microlens units is different. That is, the microlens units are randomly distributed, and the random distribution is beneficial to improving the light color uniformity of the projected light spot.
In the present embodiment, the distance between two adjacent convex surfaces 12 is greater than 1 micron and equal to or less than 800 microns. If the distance between two adjacent convex surfaces 12 is smaller than 1 micron, the distance between two adjacent convex surfaces 12 is too small, which is not favorable for manufacturing the columnar free-form surface. If the distance between two adjacent convex surfaces 12 is greater than 800 micrometers, the distance between two adjacent convex surfaces 12 is too large, so that the cylindrical free curved surface has a poor shaping effect on the light beam. The distance between two adjacent convex surfaces 12 is limited within the range of 1-800 microns, so that the columnar free curved surface can be manufactured, and the shaping effect of the columnar free curved surface on light beams can be ensured.
In the present embodiment, the width of the concave surface 11 is 4 micrometers or more and 400 micrometers or less. If the width of the concave surface 11 is less than 4 μm, the width of the concave surface 11 is too small, which is not favorable for the design and manufacture of the concave surface 11. If the width of the concave surface 11 is larger than 400 micrometers, the width of the concave surface 11 is too large, which is not beneficial to shaping the light beam and has poor diffusion effect. And the width of the concave surface 11 is limited to the range of 4 microns to 400 microns, so that the design and the manufacture of the concave surface 11 are facilitated while the light beam shaping effect of the concave surface 11 is ensured.
In the present embodiment, the height of the concave surface 11 is equal to or greater than 3.45 micrometers and equal to or less than 345 micrometers. If the height of the concave surface 11 is less than 3.45 micrometers, the height of the concave surface 11 is too small to shape the light beam. If the height of the concave surface 11 is greater than 345 micrometers, the height of the concave surface 11 is too large, which is easy to form residual glue and is not beneficial to demolding of the light uniformizing element. The height of the concave surface 11 is limited within the range of 3.45 micrometers to 345 micrometers, so that the light beam shaping effect of the concave surface 11 is ensured, residual glue is prevented from being formed at the concave surface 11, and the yield of the dodging element is ensured.
In the present embodiment, the width of the convex surface 12 is 1.5 micrometers or more and 400 micrometers or less. If the width of the convex surface 12 is less than 1.5 μm, the width of the convex surface 12 is too small to be beneficial for the design and manufacture of the convex surface 12. If the width of the convex surface 12 is larger than 400 micrometers, the width of the convex surface 12 is too large, which is not beneficial to shaping the light beam and has poor diffusion effect. And the width of the convex surface 12 is limited to the range of 1.5 microns to 400 microns, so that the design and the manufacture of the convex surface 12 are facilitated while the beam shaping effect of the convex surface 12 is ensured.
In the present embodiment, the height of the convex surface 12 is not less than 1.29 micrometers and not more than 345 micrometers. If the height of the convex surface 12 is less than 1.29 μm, the height of the convex surface 12 is too small to shape the light beam. If the height of the convex surface 12 is greater than 345 micrometers, the convex surface 12 is too high and is easy to break, which is not favorable for demoulding the dodging element. The height of the convex surface 12 is limited within the range of 1.29 micrometers to 345 micrometers, so that the convex surface 12 is prevented from being broken while the light beam shaping effect of the convex surface 12 is ensured, and the yield of the dodging element is ensured.
As shown in fig. 3, the fresnel structure has a plurality of tooth structures 21, and the maximum tooth height in the tooth structures 21 is 3 micrometers or more and 300 micrometers or less. If the maximum tooth height is less than 3 μm, the tooth height in the tooth structure 21 is small, and the tooth structure 21 is less bulged, which is not favorable for shaping the light beam by the tooth structure 21. If the maximum tooth height is greater than 300 microns, the tooth structure 21 is raised to a greater extent, which is not favorable for demolding the tooth structure 21, and the tooth structure 21 is easy to be incomplete, so that the yield of the light uniformizing element is low. The maximum tooth height in the tooth structure 21 is limited within the range of 3 micrometers to 300 micrometers, so that the Fresnel shaping effect on light beams is guaranteed, meanwhile, the demolding of the tooth structure 21 is facilitated, and the yield of the dodging element is guaranteed.
Specifically, the maximum pitch of the teeth structure 21 is not less than 10 micrometers and not more than 1000 micrometers. If the maximum pitch is less than 10 microns, the maximum pitch is smaller, and the remaining pitches are smaller, the distance between the teeth is too small, which is not favorable for manufacturing the tooth structure 21. If the maximum pitch is greater than 1000 μm, the maximum pitch is too large, resulting in poor beam shaping effect of the tooth structure 21. And the maximum pitch is limited within the range of 10 microns to 1000 microns, so that the manufacturing and yield of the tooth structure 21 are ensured while the shaping effect of the tooth structure 21 on light beams is ensured.
Specifically, the refractive index of the first adhesive layer and the second adhesive layer to yellow light of 589nm is greater than or equal to 1.4 and less than or equal to 1.6. The first adhesive layer and the second adhesive layer are formed by impressing glue with refractive index larger than or equal to 1.4 and smaller than or equal to 1.6 for 589nm yellow light so as to form a columnar free curved surface and a Fresnel surface. The material of the dodging element can be epoxy resin and acrylate.
Specifically, the horizontal scattering angle corresponding to the dodging element is greater than 100 ° and less than 150 °. The horizontal scattering angle is in the range of 100 ° to 150 ° for the purpose of spreading the light beam horizontally.
Specifically, the vertical scattering angle corresponding to the dodging element is greater than 5 ° and less than 15 °. The vertical scatter angle is in the range of 5 ° to 15 ° for the purpose of collimating or shrinking the beam vertically.
The light homogenizing element performs beam shaping on light emitted by the VCSEL light source, and performs microstructure design on the light incident surface 10 and the light emergent surface 20 respectively, so that the emergent light is uniformly distributed within a designed angle range, and a target light homogenizing effect is realized.
To simplify the design model, for a VCSEL light source located at spatial coordinates (0, -b,0), it is assumed that there is a concave ML that can meet certain light distribution design objectives1As shown in FIG. 10, the surface can be XY-richThe expression is expressed by a formula curved surface equation:
wherein c isjFor the coefficients of the known polynomial terms,
if for concave surface ML1The structure size is scaled by p times in an equal proportion, and the structure is symmetrically turned around the X axis on the XZ plane and then is translated by (L + L)/2 along the X axis to obtain a convex ML2Wherein p is a positive number and
l ═ p · L, making the concave surface ML1Convex surface ML2Just contiguous and smoothly transitioning.
Concave ML1And convex ML2Satisfies the following conditions:
the microlens ML can be obtained by simultaneous equations (1), (2) and (3)2Each cj。
Currently, the concave surface ML1And convex ML2The contour equations projected on the XZ plane are respectively
After simplification
Assuming that the included angle between the incident light emitted by the VCSEL and the Z axis is theta, the linear equation is as follows:
z3＝l1(θ,x)＝k1x-b ═ cot (θ). x-b equation (4)
The concave ML can be obtained by simultaneous formulas (1) and (4)1Incident point coordinate (x)i,zi) Wherein x isi,ziAre variables related to theta. The slope of the tangent line and the normal line passing through the point are respectively
Then according to the formula of the included angle between the two straight lines
Slope formula tan (r) ═ kNAnd fresnel law sin (α) ═ n · si (n β), and α, β, and γ can be obtained, respectively, and these three parameters are variables relating to θ. The linear equation for the corresponding refracted ray is:
z4＝l2(θ,x)＝k2·(x-xi)+zi＝tan(β+γ)·(x-xi)+zi，
when theta is changed within a certain range of values, the refracted ray z4(theta, x) will change accordingly, and each value thetaiCorrespondingly, there is a unique refracted ray z4(θ,x)。
When x is in the range of l/2 < x < (p +1) · l/2, if any point or interval exists, z can be satisfied4(θ,x)≤z2(p, x), then convex ML2Will refract the light ray z4(θ, x) create refractive or reflective interference, thereby affecting the optical path.
Thus, if and only if there is only one refracted ray z4(θ, x) exactly coincides with the convex ML2Tangential, while the other rays are directed away from the surface of the microlens element, i.e. refracted ray z4A point x on (theta, x)0Satisfies z4(θ0,x0)＝z2(p0,x0) The scaling threshold p can be obtained0。
In a specific embodiment, the size of the light homogenizing element is 2.5 × 0.5mm, wherein the pitch of the microlens units of the light incident surface 10 is 60 μm, the width and height of the concave surface 11 are 40 μm and 34.5 μm respectively, the width and height of the convex surface 12 adjacent to the concave surface are 20 μm and 17.25 μm respectively, and the scaling ratio is 2: 1; the maximum tooth height of the Fresnel structure of the light-emitting surface is 30 mu m, and the maximum tooth pitch is 100 mu m. After light emitted by the Vcsel light source is independently shaped by two sides of the light homogenizing sheet, light intensity distribution with a scattering angle of 128 degrees by 9 degrees can be output, and the light intensity distribution appears as narrow line light spots on an illuminated surface, as shown in fig. 11 and 12.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the curved surface is smooth and continuous without sharp corners, which is beneficial to the surface shape matching of the process end and the design end, improves the iteration efficiency of product design, and simultaneously increases the service life of the template and the yield of products;
2. aiming at the design of a wide scattering angle light field, the concave surfaces and the convex surfaces are sequentially arranged at intervals according to a certain scaling ratio, so that the total reflection between the adjacent curved surfaces can be prevented, the possibility is provided for the use of the low-refractive-index imprinting glue, and the manufacturing cost is reduced;
3. curvature continuous transition is directly designed in the micro-lens unit, and the problem of uneven diffusion of the light homogenizing sheet caused by overlarge fillet occupation ratio can be solved by the accurate matching design of adjacent curved surfaces;
4. the double-sided microstructure design of the light homogenizing unit has the advantages that the stretching directions of the light incident surface 10 and the light emergent surface 20 are mutually vertical, the independent control of horizontal and vertical light fields can be realized, the Fresnel structure is arranged on the light emergent surface 20, the use of a collimating element is reduced, and the structural space and the cost of an optical system are saved.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
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 application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of 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 this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides an even light component, its characterized in that, even light component is sheet structure, even light component includes transparent substrate and sets up the first glue film and the second glue film of the relative both sides of transparent substrate, first glue film has income plain noodles (10), the second glue film has play plain noodles (20), it is cylindrical free-form surface to go into plain noodles (10), a plurality of concave surfaces (11) and a plurality of convex surfaces (12), one have in the cylindrical free-form surface concave surface (11) and one convex surface (12) are connected and smooth transition forms the microlens unit, realize the wide-angle diffusion to the light beam, it is fresnel surface to go out plain noodles (20), fresnel surface has fresnel structure, realizes the collimation or the convergence to the light beam.
2. A light unifying element according to claim 1 wherein the extension direction of the microlens unit is perpendicular to the extension direction of the fresnel structure.
3. A light unifying element according to claim 1 characterized in that the junction of the concave surface (11) and the convex surface (12) has the same curvature.
4. A light unifying element according to claim 1 characterized in that the convex surface (12) in the microlens unit is turned 180 degrees and then arranged in proportion to the concave surface (11).
5. A light unifying element according to claim 4 characterized in that the ratio between the concave (11) and convex (12) surfaces is greater than 0 and less than 2.67.
6. The light unifying element according to claim 4, wherein the columnar free-form surface has a plurality of microlens units,
the ratio of the concave surface (11) to the convex surface (12) in a plurality of the microlens units is the same; or
The proportions of the concave surface (11) and the convex surface (12) in at least two microlens units are different.
7. A light homogenizing element according to claim 1, characterized in that the spacing between two adjacent convex surfaces (12) is greater than 1 micron and less than or equal to 800 microns.
8. The light unifying element of claim 1,
the width of the concave surface (11) is more than or equal to 4 micrometers and less than or equal to 400 micrometers; and/or
The height of the concave surface (11) is more than or equal to 3.45 micrometers and less than or equal to 345 micrometers.
9. The light unifying element of claim 1,
the width of the convex surface (12) is more than or equal to 1.5 micrometers and less than or equal to 400 micrometers; and/or
The height of the convex surface (12) is greater than or equal to 1.29 micrometers and less than or equal to 345 micrometers.
10. A light unifying element according to any of claims 1 to 9 characterized in that the Fresnel structure has a plurality of tooth structures (21),
the maximum tooth height in the tooth structure (21) is more than or equal to 3 micrometers and less than or equal to 300 micrometers; and/or
The maximum pitch of the teeth structure (21) is greater than or equal to 10 micrometers and less than or equal to 1000 micrometers.
11. A light unifying element according to any one of claims 1 to 9 wherein the refractive index of the first glue layer and the second glue layer for yellow light of 589nm is greater than or equal to 1.4 and less than or equal to 1.6.
12. A light unifying element according to any one of claims 1 to 9,
the horizontal scattering angle corresponding to the dodging element is larger than 100 degrees and smaller than 150 degrees; and/or
The vertical scattering angle corresponding to the dodging element is larger than 5 degrees and smaller than 15 degrees.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115016051A (en) * | 2022-06-24 | 2022-09-06 | 奥比中光科技集团股份有限公司 | Diffuser and design method thereof |
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2022
- 2022-01-26 CN CN202220218531.8U patent/CN216792482U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115016051A (en) * | 2022-06-24 | 2022-09-06 | 奥比中光科技集团股份有限公司 | Diffuser and design method thereof |
| WO2023245901A1 (en) * | 2022-06-24 | 2023-12-28 | 奥比中光科技集团股份有限公司 | Diffuser and design method therefor |
| CN115016051B (en) * | 2022-06-24 | 2024-05-31 | 奥比中光科技集团股份有限公司 | Diffuser and design method thereof |
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