CN219715785U - Light diffuser - Google Patents

Abstract

The utility model provides a light diffuser. The light diffuser includes: the microlens array layer is provided with a multistage area, the multistage area at least comprises a first-stage area, a second-stage area and a third-stage area, the multistage area is composed of A.times.B first-stage areas, at least part of the first-stage area is composed of C.times.D second-stage areas, at least part of the second-stage area is composed of E.times.F third-stage areas, so that at least one low-stage area is composed of a plurality of high-stage areas, and each stage area is provided with microlenses matched with the high-stage areas in size. The utility model solves the problem that the light diffuser in the prior art has obvious diffraction fringes.

Description

Light diffuser

Technical Field

The utility model relates to the technical field of optical equipment, in particular to a light diffuser.

Background

At present, the mode of distance measurement in the industry mainly comprises binocular, structured light and TOF, wherein the binocular precision is lower, the structured light structure is complex and high in cost, the TOF has enough precision and low cost, and the method has a trend of popular popularization. TOF generally consists of a transmitting end and a receiving end, wherein the transmitting end mainly consists of a vcsel light source and a light diffuser (diffuser).

The prior light diffuser mainly adopts a periodic array of micro lenses with one size to realize the required light field distribution, and because of strong regularity of an array structure and regular optical path differences among the micro lenses, light spots finally displayed by the product form obvious diffraction stripes, and the use of the product is affected.

That is, the light diffuser of the prior art has a problem in that diffraction fringes are remarkable.

Disclosure of Invention

The utility model mainly aims to provide a light diffuser so as to solve the problem that diffraction fringes are obvious in the light diffuser in the prior art.

In order to achieve the above object, the present utility model provides a light diffuser comprising: the microlens array layer is provided with a multistage area, the multistage area at least comprises a first-stage area, a second-stage area and a third-stage area, the multistage area is composed of A.times.B first-stage areas, at least part of the first-stage area is composed of C.times.D second-stage areas, at least part of the second-stage area is composed of E.times.F third-stage areas, so that at least one low-stage area is composed of a plurality of high-stage areas, and each stage area is provided with microlenses matched with the high-stage areas in size.

Further, the multi-level region at least further comprises a four-level region, a five-level region and a six-level region, at least part of the three-level region is composed of M, N and four-level regions, at least part of the four-level region is composed of Q, G and five-level regions, at least part of the five-level region is composed of J, R and six-level regions, each level of region is formed by primary rectangular grid division, and the number of rectangular grid division times of the multi-level region is more than or equal to 5.

Further, the number of the higher-level regions in one lower-level region is 2 or more and 20 or less.

Further, the sizes of the plurality of higher-level regions in one lower-level region are all the same or different.

Further, the size of the multi-level region is larger than the effective display area of the light diffuser, and the length and width of the multi-level region are both larger than 10um.

Further, the number of high-level regions in at least two low-level regions in the low-level regions of 3*3 is different.

Further, the multi-stage region includes a highest-stage region and a lowest-stage region, and the size of the multi-stage region is 3 times or more the size of the highest-stage region.

Further, the size of the multi-stage region is 3 times or more the size of the lowest stage region.

Further, the size of the lowest level region is 3 times or more the size of the highest level region.

Further, the surface of the micro lens is one of a free curved surface, a cylindrical surface, a spherical surface and a conical surface, and the size of the micro lens is more than or equal to 10um and less than or equal to 1000um.

By applying the technical scheme of the utility model, the optical diffuser comprises a micro-lens array layer, the micro-lens array layer is provided with a multi-stage area, the multi-stage area at least comprises a first-stage area, a second-stage area and a third-stage area, the multi-stage area is composed of A.times.B first-stage areas, at least part of the first-stage area is composed of C.times.D second-stage areas, at least part of the second-stage area is composed of E.times.F third-stage areas, so that at least one low-stage area is composed of a plurality of high-stage areas, and each stage area is provided with micro lenses matched with the micro-lens.

The micro lens array layer is provided with a plurality of levels of areas, at least one low-level area is formed by a plurality of high-level areas, micro lenses matched with the micro lens array layer in size are arranged in each level of areas, the micro lenses of the higher level are divided into multiple levels, the sizes of the micro lenses of the higher level are smaller, the micro lenses in the multiple levels of areas are reasonably distributed, the optical path differences among the micro lenses are different, and the problem that diffraction fringes are obvious due to the optical path differences among the micro lenses can be effectively avoided in the multiple levels of areas.

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 layout of a microlens array layer of a prior art light diffuser;

FIG. 2 shows an illuminance distribution diagram of the light diffuser in FIG. 1;

FIG. 3 shows a schematic view of a light diffuser according to an alternative embodiment of the present utility model;

FIG. 4 shows a schematic diagram of meshing of multiple levels of regions of the light diffuser of FIG. 3;

FIG. 5 shows a schematic diagram of meshing of the primary region of FIG. 4;

FIG. 6 shows a schematic diagram of meshing of the secondary region of FIG. 5;

FIG. 7 shows a schematic view of a microlens array layer of an alternative embodiment of the light diffuser of the present utility model;

FIG. 8 shows a schematic diagram of an equal scale scaling of a microlens;

FIG. 9 shows an illuminance distribution for a light diffuser according to an alternative embodiment of the present utility model;

FIG. 10 illustrates a grid-like segmentation of a multi-stage region of a light diffuser in accordance with another alternative embodiment of the present utility model.

Wherein the above figures include the following reference numerals:

10. a light diffuser; 11. a microlens array layer; 111. a microlens; 20. a multi-level region; 30. a first level region; 40. a secondary region; 50. and a tertiary region.

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.

As shown in fig. 1 and 2, the arrangement of the microlenses of the light diffuser and the illuminance of the light diffuser in the prior art are shown. As shown in fig. 1, the conventional light diffuser is a periodic array arrangement mode of microlenses, the size of a single microlens is a×b, the size of the light diffuser is a×b, the number of rows m=a/a of the arrangement of the microlenses, the number of columns n=b/B of the arrangement, and the microlenses are paved on the effective area of the light diffuser, and because all the microlenses are equally spaced, when the light source passes through the light diffuser, equal optical path differences are generated among the microlenses, and further the obtained illuminance light spots generate light and dark alternate horizontal and vertical stripes, namely diffraction stripes (as shown in fig. 2), so that the use of the light diffuser is seriously affected.

In order to solve the problem that diffraction fringes are obvious in a light diffuser in the prior art, the utility model provides the light diffuser.

As shown in fig. 3 to 10, the light diffuser 10 includes a microlens array layer 11, the microlens array layer 11 has a multi-stage region 20, the multi-stage region 20 includes at least a first-stage region 30, a second-stage region 40, and a third-stage region 50, the multi-stage region 20 is composed of a a×b first-stage regions 30, at least a part of the first-stage region 30 is composed of c×d second-stage regions 40, and at least a part of the second-stage region 40 is composed of e×f third-stage regions 50, so that at least one low-stage region is composed of a plurality of high-stage regions, each having microlenses 111 whose dimensions match those of the high-stage regions.

The microlens array layer 11 has a plurality of levels of regions 20, and at least one lower level region is composed of a plurality of higher level regions, each level region has microlenses 111 matched with the sizes of the regions, so that the sizes of the microlenses 111 more to the higher level are smaller by dividing the microlens array layer 11 in multiple levels, and the optical path differences among the microlenses 111 are different by reasonably arranging the microlenses 111 in the multiple levels of regions 20, so that the problem that diffraction fringes are obvious due to the optical path differences among the microlenses 111 can be effectively avoided by the multiple levels of regions 20, and the light diffuser 10 can effectively eliminate diffraction fringe phenomena and improve imaging quality.

Specifically, the multi-level region 20 further includes at least four-level regions, five-level regions and six-level regions, at least part of the three-level region 50 is formed by m×n four-level regions, at least part of the four-level region is formed by q×g five-level regions, at least part of the five-level region is formed by j×r six-level regions, each level region is formed by one rectangular grid division, and the number of rectangular grid divisions of the multi-level region 20 is 5 or more.

It should be noted that, the low-level region and the high-level region are relatively speaking, the difference in the number of levels between the low-level region and the high-level region is equal to 1, and if the first-level region 30 is the low-level region, the second-level region 40 is the high-level region; if the secondary region 40 is a low-level region, the tertiary region 50 is a high-level region; if the tertiary region 50 is a low-level region, the quaternary region is a high-level region, and so on. Specifically, at least one primary region 30 of the plurality of primary regions 30 is constituted by a plurality of secondary regions 40, at least one secondary region 40 is constituted by a plurality of tertiary regions 50, at least one tertiary region 50 is constituted by a plurality of quaternary regions, at least one quaternary region is constituted by a plurality of quaternary regions, and so on. One lower level region is formed into a plurality of higher level regions by one rectangular mesh division, and in the present utility model, the number of rectangular mesh divisions is more than 5, that is, the lowest of the multi-level regions 20 of the present utility model includes one level region 30 to six level regions, and of course, seven level regions, eight level regions, or more may be included.

In an alternative embodiment of the utility model, A equals B, C equals D, E equals F, M equals N, Q equals G, J equals R; in another alternative embodiment of the present utility model, a is not equal to B, C is not equal to D, E is not equal to F, M is not equal to N, Q is not equal to G, J is not equal to R.

Specifically, the number of higher-level regions in one lower-level region is 2 or more and 20 or less. That is, the number of the secondary regions 40 in one primary region 30 is 2 or more and 20 or less, the number of the tertiary regions 50 in one secondary region 40 is 2 or more and 20 or less, the number of the quaternary regions in one tertiary region 50 is 2 or more and 20 or less, the number of the quaternary regions in one quaternary region is 2 or more and 20 or less, the number of the quaternary regions is 2 or more and 20 or less, the number of the sixth regions in one quaternary region is 2 or more and 20 or less, and so on.

Specifically, in the embodiment of the present utility model, each of the regions is rectangular in shape, and the sizes of the plurality of higher regions in one lower region are the same or different. That is, the plurality of higher-level regions in one lower-level region may be rectangles of equal size as shown in fig. 4, 5; the plurality of higher-level regions in one lower-level region may also be rectangular shapes of unequal sizes as shown in fig. 10.

Specifically, the size of the multi-stage area 20 is larger than the effective display area of the light diffuser 10, and since the size of the effective display area of the light diffuser 10 is generally in the range of more than 10um and less than 10000um, the length and width of the multi-stage area 20 are both larger than 10um.

Specifically, the number of high-level regions in at least two low-level regions among the low-level regions of 3*3 is different. Further, in the range of the primary region 30 of 3*3, the number of secondary regions 40 in at least two primary regions 30 is different; within the scope of the secondary areas 40 of 3*3, wherein the number of tertiary areas 50 in at least two secondary areas 40 is different; within the scope of the tertiary regions 50 of 3*3, wherein the number of quaternary regions in at least two tertiary regions 50 are different, and so forth. Preferably, the number of higher regions in the lower regions of 3*3 varies.

In the embodiment of the present utility model, the multi-stage region 20 includes a highest-stage region and a lowest-stage region, and the size of the multi-stage region 20 is more than 3 times the size of the highest-stage region. The size of the highest level region is the smallest in the multi-level region 20 and the size of the lowest level region is the largest in the multi-level region 20.

Specifically, the size of the multi-stage region 20 is 3 times or more the size of the lowest stage region. The size of the lowest level region is 3 times or more the size of the highest level region.

The surface of the microlens 111 is one of a free-form surface, a cylindrical surface, a spherical surface, and a conical surface, and the size of the microlens 111 is 10um or more and 1000um or less.

The manner of forming the multi-stage region 20 of the microlens array layer 11 of the light diffuser 10 of the present utility model is described below with reference to specific embodiments and drawings.

As shown in fig. 3, the size of the single microlens 111 is a×b, the length and width of the design size of the light diffuser 10 are k×a and k×b, respectively, the size of the light diffuser 10 is greater than or equal to the size of the effective display area of the light diffuser 10 (the range of the dashed line frame is the effective display area), the light diffuser 10 has a multi-stage area 20, the multi-stage area 20 includes at least the above-mentioned one-stage area 30 to six-stage area, and only the mesh division of the multi-stage area 20 into the three-stage area 50 will be described below.

As shown in fig. 4, the multi-level region 20 is first gridded into a plurality of first-level regions 30 such that the multi-level region 20 is composed of the plurality of first-level regions 30. In the embodiment of the present utility model, na=4 indicates that the multi-level region 20 is divided into 4*4 uniform first-level regions 30, and each of the first-level regions 30 is rectangular and equal in size.

As shown in fig. 5, the primary region 30 of 4*4 is then subjected to a second meshing, taking the Nb11 region as an example (b represents the second meshing, 11 represents the first row and first column), and nb11=5 represents meshing the Nb11 region, that is, the primary region 30, into uniform 5*5 secondary regions 40, each of which secondary regions 40 is rectangular and equal in size. In the second and subsequent meshing steps, the number of meshes is different from each other within the area of 3*3, for example, (Nb 11, nb21, nb31, nb12, nb22, nb32, nb13, nb23, nb 33), (Nb 21, nb31, nb41, nb22, nb32, nb42, nb23, nb33, nb 43), etc., and the number of meshes is more than 2 and less than 20 each time, and the number of meshes of each stage area is assigned, and the number of meshes is shown as the same as the Nb11 area, and only the division of the Nb11 area is shown in the figure.

As shown in fig. 6, the next grid division is performed on the secondary area 40, and Nc11 is taken as an example, where the secondary area 40 is divided into three-level areas 50 of 11×11, and other area division specifications are the same as the second grid division requirement, and after that, each area is continuously divided until the size of the area is 0.1 to 10 times the structural size, and the grid division number is greater than 5 times.

As shown in fig. 7, the micro lens array layer 11 of the whole light diffuser 10 is a schematic diagram after grid division, the length and width of each small grid are L and W respectively, as shown in L1 and W1 in the figure, the length and width of all small grids are Li and Wi (i=1, 2, 3, 4, 5 and … …), each small grid is provided with one micro lens 111, and the micro lens 111 is to be filled with grids without leaving white, so that the micro lens 111 needs to be scaled according to each grid, as shown in fig. 8, the length and width of the original micro lens 111 are a×b×h respectively, the length and width of the original micro lens 111 is li=qi×a, wi=qi×b and qi×h after scaling for the grid area size, (Q is scaling multiple, i corresponds to the length and width of each small grid area i=1, 2, 3, 4, 5× 5 … …), the micro lens 111 is arranged according to the length and width of each small grid area, the light beam is not scaled by a scaling angle, and the light path difference is not changed in the light scattering area, as shown in the light scattering area is not changed, and the light scattering phenomenon is shown in the light scattering area is greatly, and the light scattering area is not changed.

As shown in fig. 10, a grid division method different from the above-described light diffuser 10 is shown. The same level of area 30 obtained after each meshing in the above manner is of equal size. In fig. 10, for example, when the multi-level region 20 is divided into a plurality of a-B primary regions 30 by meshing, the length or width of the primary regions 30 are not equal, and the final illuminance effect is shown in fig. 9.

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 (10)

1. A light diffuser, comprising:

a microlens array layer (11), the microlens array layer (11) having a multilevel region (20), the multilevel region (20) comprising at least a first level region (30), a second level region (40) and a third level region (50), the multilevel region (20) being composed of a×b number of the first level regions (30), at least part of the first level regions (30) being composed of c×d number of the second level regions (40), at least part of the second level regions (40) being composed of e×f number of the third level regions (50), such that at least one low level region is composed of a plurality of high level regions, each of the level regions having microlenses (111) matching a size thereof.

2. The light diffuser of claim 1, wherein the multi-stage region (20) further comprises at least a four-stage region, a five-stage region, and a six-stage region, at least a portion of the three-stage region (50) is formed by m×n of the four-stage regions, at least a portion of the four-stage region is formed by q×g of the five-stage region, at least a portion of the five-stage region is formed by j×r of the six-stage region, each stage region is formed by one rectangular grid division, and the number of rectangular grid divisions of the multi-stage region (20) is 5 or more.

3. The light diffuser of claim 1 wherein the number of the higher-level regions in one of the lower-level regions is 2 or more and 20 or less.

4. A light diffuser as recited in claim 1, wherein a plurality of said higher regions in one said lower region are all the same or different in size.

5. A light diffuser according to claim 1, characterized in that the size of the multi-level region (20) is larger than the effective display area of the light diffuser, and that the length and width of the multi-level region (20) are both larger than 10um.

6. The light diffuser of claim 1 wherein the number of the high-level regions in at least two of the low-level regions of 3*3 is different.

7. The light diffuser of claim 1, wherein the multi-level region (20) comprises a highest level region and a lowest level region, the multi-level region (20) having a size that is more than 3 times the size of the highest level region.

8. A light diffuser according to claim 7, characterized in that the size of the multi-level region (20) is more than 3 times the size of the lowest level region.

9. The light diffuser of claim 7 wherein the size of the lowest level region is more than 3 times the size of the highest level region.

10. The light diffuser according to any one of claims 1 to 9, wherein a surface of the microlens (111) is one of a free-form surface, a cylindrical surface, a spherical surface, and a tapered surface, and a size of the microlens (111) is 10um or more and 1000um or less.