Light homogenizing sheet and TOF module
阅读说明:本技术 匀光片和tof模组 (Light homogenizing sheet and TOF module ) 是由 吴沣原 明玉生 魏明贵 孙理斌 汪杰 陈远 于 2020-08-28 设计创作,主要内容包括:本发明提供了一种匀光片和TOF模组。匀光片包括:基底层;微结构层,微结构层连接在基底层一侧的表面上,微结构层远离基底层一侧的表面具有微结构区,微结构区具有多个微透镜;准直镜层,准直镜层连接在微结构层远离基底层一侧的表面上,准直镜层远离微结构层一侧的表面具有隆起的准直镜,准直镜向微结构层的投影与微结构区的至少一部分重合。本发明解决了现有技术中的匀光片存在匀光效果差的问题。(The invention provides a light homogenizing sheet and a TOF module. The light homogenizing sheet comprises: a base layer; the microstructure layer is connected to the surface of one side of the substrate layer, the surface of one side, away from the substrate layer, of the microstructure layer is provided with a microstructure area, and the microstructure area is provided with a plurality of microlenses; the collimating mirror layer is connected to the surface of the side, away from the substrate layer, of the microstructure layer, the surface of the side, away from the microstructure layer, of the collimating mirror layer is provided with a raised collimating mirror, and the projection of the collimating mirror to the microstructure layer is overlapped with at least one part of the microstructure area. The invention solves the problem of poor light homogenizing effect of the light homogenizing sheet in the prior art.)
1. A light unifying sheet comprising:
a base layer (10);
a microstructure layer (20), wherein the microstructure layer (20) is connected to the surface of one side of the substrate layer (10), and the surface of the microstructure layer (20) far away from the substrate layer (10) is provided with a microstructure area which is provided with a plurality of microlenses (21);
the micro-structure layer (20) is kept away from on the surface of stratum basale (10) one side, collimating mirror layer (30) are kept away from collimating mirror (30) the surface of stratum basale (20) one side has a collimating mirror (31) that swells, collimating mirror (31) to the projection of stratum basale (20) with at least partly coincidence in micro-structure district.
2. A light homogenizing sheet according to claim 1, characterized in that the projection of the collimating mirror (31) onto the microstructure layer (20) is located within the microstructure area.
3. The light uniformizing sheet according to claim 1,
the microstructure layer (20) is a high-refractive-index glue layer, and the refractive index of the microstructure layer (20) is more than or equal to 1.5 and less than or equal to 1.9; and/or
The collimating mirror layer (30) is a low-refractive-index glue layer, and the refractive index of the collimating mirror layer (30) is greater than or equal to 1.4 and less than or equal to 1.6.
4. The dodging sheet according to claim 2, wherein the surface of the micro-lens (21) on the side away from the substrate layer (10) is a concave surface, and the surface of the collimating mirror layer (30) on the side close to the micro-structural layer (20) is provided with a convex structure matched with the concave surface, and the convex structure extends into the concave surface.
5. The light uniformizing sheet according to claim 1,
the thickness of the substrate layer (10) is greater than or equal to 0.1 mm and less than or equal to 1 mm; and/or
The thickness of the microstructure layer (20) is more than or equal to 10 micrometers and less than or equal to 100 micrometers; and/or
The thickness of the collimating mirror layer (30) is less than or equal to 2 mm; and/or
The thickness of the light homogenizing sheet is less than 3 mm.
6. A light homogenizing sheet according to claim 1, characterized in that the surface of the side of the collimating mirror (31) facing away from the substrate layer (10) is curved,
the curvature radius of the collimating mirror (31) is more than or equal to 0.5 mm and less than or equal to 5 mm; and/or
The height of the collimating mirror (31) is less than or equal to 2 mm.
7. The dodging sheet according to claim 1, wherein the distance between the centers of two adjacent microlenses (21) is greater than or equal to 1 micrometer and less than or equal to 100 micrometers.
8. The light uniformizing sheet according to claim 1,
the surface of the micro lens (21) is a continuous curved surface; and/or
The aperture of the micro lens (21) is in at least one of a closed shape formed by combining a polygon, a circle, a straight line and a curve and a closed shape formed by combining a plurality of sections of curves with different curvature radiuses.
9. A TOF module, comprising:
a light unifying sheet (40) according to any one of claims 1 to 8;
the fixed substrate is arranged on one side, away from the basal layer (10) of the light homogenizing sheet (40), and the fixed substrate and the light homogenizing sheet (40) are arranged at intervals to form an air layer;
a VCSEL light source (50), the VCSEL light source (50) being disposed on the stationary substrate.
10. The TOF module of claim 9 wherein the thickness of the layer of air is less than 0.4 mm.
Technical Field
The invention relates to the technical field of optical imaging equipment, in particular to a dodging sheet and a TOF module.
Background
With the rapid development of the optical industry, the 3D sensing system becomes more and more powerful, which has become a large industrial trend in the coming years. The TOF lens module has an increasing application in the current face recognition and three-dimensional detection technology, and the projection end of the TOF lens module is generally composed of a VCSEL light source chip and a dodging sheet. The conventional dodging sheet generally comprises a substrate layer and a microstructure layer, and can realize the diffusion effect of the VCSEL light source. The light emitted by the VCSEL light source chip generally has a divergence angle of about 28 degrees, after passing through the collimating-layer-free light homogenizing sheet, the area with higher central intensity of an emergent light field is an actual effective area, the edge intensity of the light field needs to be slowly reduced to 0, and the area with lower intensity cannot be utilized, so that the actual efficiency is low and is often about 80%.
That is, the light uniformizing sheet in the prior art has a problem of poor light uniformizing effect.
Disclosure of Invention
The invention mainly aims to provide a light uniformizing sheet and a TOF module, and aims to solve the problem that a light uniformizing sheet in the prior art is poor in light uniformizing effect.
In order to achieve the above object, according to one aspect of the present invention, there is provided a light uniformizing sheet including a base layer; the microstructure layer is connected to the surface of one side of the substrate layer, the surface of one side, away from the substrate layer, of the microstructure layer is provided with a microstructure area, and the microstructure area is provided with a plurality of microlenses; the collimating mirror layer is connected to the surface of the side, away from the substrate layer, of the microstructure layer, the surface of the side, away from the microstructure layer, of the collimating mirror layer is provided with a raised collimating mirror, and the projection of the collimating mirror to the microstructure layer is overlapped with at least one part of the microstructure area.
Further, the projection of the collimating mirror to the microstructure layer is located in the microstructure area.
Furthermore, the microstructure layer is a high-refractive-index glue layer, and the refractive index of the microstructure layer is more than or equal to 1.5 and less than or equal to 1.9; and/or the collimating mirror layer is a low-refractive-index glue layer, and the refractive index of the collimating mirror layer is more than or equal to 1.4 and less than or equal to 1.6.
Furthermore, the surface of the side, away from the substrate layer, of the micro lens is a concave surface, the surface of the side, close to the micro structure layer, of the collimating lens layer is provided with a convex structure matched with the concave surface, and the convex structure extends into the concave surface.
Further, the thickness of the substrate layer is greater than or equal to 0.1 mm and less than or equal to 1 mm; and/or the thickness of the microstructure layer is more than or equal to 10 microns and less than or equal to 100 microns; and/or the thickness of the collimating mirror layer is less than or equal to 2 mm; and/or the light homogenizing sheet has a thickness of less than 3 mm.
Furthermore, the surface of one side of the collimating mirror, which is far away from the substrate layer, is a curved surface, and the curvature radius of the collimating mirror is greater than or equal to 0.5 mm and less than or equal to 5 mm; and/or the height of the collimating mirror is less than or equal to 2 mm.
Further, the distance between the centers of two adjacent microlenses is greater than or equal to 1 micrometer and less than or equal to 100 micrometers.
Further, the surface of the microlens is a continuous curved surface; and/or the aperture of the micro lens is in at least one of a closed shape formed by combining a polygon, a circle, a straight line and a curve and a closed shape formed by combining a plurality of sections of curves with different curvature radiuses.
According to another aspect of the invention, there is provided a TOF module comprising: the light homogenizing sheet; the fixed substrate is arranged on one side of the light homogenizing sheet, which is far away from the basal layer of the light homogenizing sheet, and the fixed substrate and the light homogenizing sheet are arranged at intervals to form an air layer; and the VCSEL light source is arranged on the fixed substrate.
Further, the thickness of the air layer is less than 0.4 mm.
By applying the technical scheme of the invention, the light homogenizing sheet comprises a substrate layer, a microstructure layer and a collimating mirror layer, wherein the microstructure layer is connected on the surface of one side of the substrate layer, the surface of the microstructure layer, which is far away from the substrate layer, is provided with a microstructure area, and the microstructure area is provided with a plurality of microlenses; the collimating mirror layer is connected on the surface of the side, far away from the substrate layer, of the microstructure layer, the surface of the side, far away from the microstructure layer, of the collimating mirror layer is provided with a raised collimating mirror, and the projection of the collimating mirror to the microstructure layer is overlapped with at least one part of the microstructure area.
Through set up the collimating mirror layer on even light piece for the collimating mirror layer can play the effect of contracting VCSEL light source divergence angle, can change the angular distribution of VCSEL light source intensity, makes emergent light field edge strength falling speed accelerate, thereby has reduced the decline transition region of emergent light field and has occupied the angle, has improved incident beam utilization ratio to more than 90%, has improved the effective window efficiency in even light piece emergent light field simultaneously, and then has improved the even light efficiency of even light piece. The projection of the collimating mirror to the microstructure layer is overlapped with at least one part of the microstructure area, so that light rays emitted by the VCSEL light source can be stably transmitted to the microstructure layer through the collimating mirror, the dodging effect of the dodging sheet is guaranteed, and the TOF module is further guaranteed to work stably. By integrating the substrate layer, the microstructure layer and the collimating mirror layer, the volume of the light homogenizing sheet is effectively reduced, and the light homogenizing sheet meets the requirement of miniaturization.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic of the structure of an alternative embodiment of a shim and TOF module of the present disclosure; and
FIG. 2 shows a sectional view of the gloss homogenizing sheet of FIG. 1;
FIG. 3 is a schematic diagram showing two-dimensional distribution of the center point and the shape aperture of the micro-structured layer of the dodging sheet of FIG. 1;
FIG. 4 shows a schematic of the emergent light field of a conventional non-collimated light uniformizer;
FIG. 5 is a schematic diagram showing the intensity distribution of the transverse slice of the emergent light field of a conventional non-collimated dodging sheet;
FIG. 6 shows a schematic of the emergent light field of the light homogenizer of FIG. 1;
FIG. 7 shows a schematic diagram of the transverse slice intensity distribution of the emergent light field of the light homogenizer of FIG. 1.
Wherein the figures include the following reference numerals:
10. a base layer; 20. a microstructure layer; 21. a microlens; 30. a collimating mirror layer; 31. a collimating mirror; 40. light homogenizing; 50. a VCSEL light source.
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 invention.
The invention provides a light homogenizing sheet and a TOF module, and aims to solve the problem that a light homogenizing sheet in the prior art is poor in light homogenizing effect.
As shown in fig. 1 to 7, the light homogenizing
Through set up collimating
It should be noted that the effective window efficiency is the actual windowing efficiency, and the actual windowing efficiency is the ratio of the light intensity in the angular field of view to the total emitted light intensity. The higher the efficiency of the effective window, the better the light uniformizing effect of the light uniformizing
As shown in fig. 1, the projection of the
Specifically, the
Of course, the surface of the
Specifically, the thickness of the
The material of the
Optionally, a film may be coated on the surface of the
Specifically, the thickness of the
It should be noted that the material of the
Optionally, a film may be coated on the surface of the
Specifically, the thickness of the
It should be noted that the
Optionally, a film may be coated on the surface of the
Specifically, the thickness of the
As shown in fig. 1, a surface of the
Specifically, the height of the
It should be noted that the collimating
Specifically, the distance between the centers of two
It should be noted that the
As shown in fig. 3, the central point and the shape aperture of the
The periodic type is a repetitive point-taking method having a certain rule, the pseudo-periodic type is a specified and approximately random point-taking method, the quasi-periodic type is a non-repetitive point-taking method having a certain rule, and the completely random type is a random point-taking method.
In addition, the surface of the
It should be noted that the
The TOF module comprises the
The thickness of the whole TOF module is not less than 100 micrometers and not more than 5 millimeters, so that the TOF module is miniaturized.
Optionally, the TOF module can be used in miniaturized devices such as mobile phones and tablet computers.
Specifically, the thickness of the air layer is less than 0.4 mm. If the thickness of the air layer is greater than 0.4 mm, it is not favorable for miniaturization of the TOF module. Through the thickness of the air layer is reasonably controlled, friction between the VCSEL
As shown in fig. 2, a sectional view of the
As shown in fig. 4, which is a schematic diagram of an emergent light field of a conventional non-collimated light homogenizing sheet, it can be seen from the diagram that the central intensity of the emergent light field is relatively high, and an area where the illumination intensity I is greater than 50% of the central illumination intensity is an actual effective area, that is, an actual using area is located inside a dashed line frame in the diagram. The edge intensity of the light field needs to be slowly reduced to 0, the intensity outside the dotted line frame is small, and the area with the illumination intensity I being 50% lower than the central illumination intensity cannot be utilized, so that the actual use efficiency is low and is generally about 80%.
As shown in fig. 5, a schematic diagram of the distribution of the transverse slice intensity of the emergent light field of the conventional non-collimated light uniformizing sheet is shown, in which the horizontal axis is the transverse slice angle, the vertical axis is the light field intensity, and the dotted line is the value of 50% of the central intensity, and it can be observed from the diagram that the edge intensity of the light field is slowly decreased, so that the region with intensity less than 50% of the central intensity cannot be used, resulting in low actual efficiency.
As shown in fig. 6, which is a schematic diagram of an emergent light field of the
As shown in fig. 7, a schematic diagram of the distribution of the transverse slice intensity of the emergent light field of the
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, 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 example 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 is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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.
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