CN117250676A - Diffusion plate and manufacturing method thereof - Google Patents
Diffusion plate and manufacturing method thereof Download PDFInfo
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- CN117250676A CN117250676A CN202210670946.3A CN202210670946A CN117250676A CN 117250676 A CN117250676 A CN 117250676A CN 202210670946 A CN202210670946 A CN 202210670946A CN 117250676 A CN117250676 A CN 117250676A
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 39
- 238000003491 array Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/06—Simple or compound lenses with non-spherical faces with cylindrical or toric faces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The application provides a diffusion plate and a method for manufacturing the diffusion plate. The diffusion plate includes: a substrate and a plurality of lenticular lenses. A plurality of lenticular lenses are disposed on a surface of the substrate. Each lenticular lens includes a middle mirror and side mirrors positioned on either side of the middle mirror. The change rate of the surface slope of the middle mirror surface is smaller than that of the side mirror surfaces on a section perpendicular to the extending direction of the lenticular lens.
Description
Technical Field
The present application relates to the field of optical elements, and more particularly, to a diffusion plate and a method of manufacturing the same.
Background
The application of Head Up Display (HUD), lidar, projection systems and other devices is becoming more and more widespread, wherein the light homogenizing element plays an irreplaceable role in order to improve the projection effect of these devices. Since a diffusion plate (Diffuser) can modulate incident light to form a relatively uniform light field at a desired viewing angle as much as possible, the diffusion plate has become a preferred light homogenizing element for mounting on devices such as head-up display systems, laser radars, projection systems, and the like.
In general, a diffusion plate mounted on a device such as a laser radar is a cylindrical lens diffusion plate, which can expand a light field in one dimension. However, the light source at the emitting end of the lens diffusion plate of the laser Lei Dazhu often has a certain divergence angle (for example, the half width of the divergence angle is about 20 °), so that after the light emitted by the light source enters the diffusion plate of the near-field laser radar, phenomena such as incapability of better utilizing the energy of a light field and the like easily occur.
Disclosure of Invention
Embodiments presented herein address or partially address the deficiencies presented in the background section above or other deficiencies in the prior art.
One aspect of the present application provides such a diffuser plate. The diffusion plate includes: a substrate; and a plurality of lenticular lenses disposed on the surface of the substrate. Each of the lenticular lenses includes: a middle mirror; and side mirrors positioned on both sides of the middle mirror, wherein a rate of change of a surface slope of the middle mirror is smaller than a rate of change of a surface slope of the side mirror on a section perpendicular to an extending direction of the lenticular lens.
In one embodiment, the absolute value of the surface slope of the intermediate mirror is less than or equal to 0.1 in a section perpendicular to the extending direction of the lenticular lens.
In one embodiment, the face shapes of the middle mirror and the side mirrors include at least one of a flat surface, a convex surface, and a concave surface.
In one embodiment, the maximum value of the absolute value of the surface slope of the side mirror is 1.12 or more in a section perpendicular to the extending direction of the lenticular lens.
In one embodiment, the side mirror includes a first side mirror and a second side mirror located on both sides of the middle mirror, respectively, and a maximum value of an absolute value of a surface slope of at least one of the first side mirror and the second side mirror is 1.12 or more in a cross section perpendicular to the extending direction of the lenticular lens.
In one embodiment, each of the lenticular lenses includes at least one of the middle mirror, at least one of the first side mirrors, and at least one of the second side mirrors.
In one embodiment, a length of a middle projection of the perpendicular projection of the middle mirror onto the substrate in a predetermined direction is greater than or equal to a length of a side projection of the perpendicular projection of the side mirror onto the substrate in the predetermined direction.
In one embodiment, the lenticular lens receives light from a light source, wherein greater than or equal to 50% of the light is emitted through the central mirror.
In one embodiment, the plurality of lenticular lenses includes a plurality of lenticular lens arrays distributed in parallel to the predetermined direction, and a maximum difference h of heights of any two of the lenticular lenses in each of the lenticular lens arrays satisfies: h is equal to or greater than λ/(n-1), where λ is the wavelength of the light incident on the lenticular lens and n is the refractive index of the lenticular lens.
In one embodiment, the surface slope of the side mirror is determined based on the diffusion angle of light incident to the lenticular lens and the refractive index of the lenticular lens.
In one embodiment, the surface slope z of the side mirror x The method meets the following conditions:
wherein,is incident on the columnar lensLight diffusion angle of mirror, n i Is the refractive index of the lenticular lens.
Another aspect of the present application provides a method of manufacturing a diffuser plate. The method comprises the following steps: setting a substrate; disposing a plurality of lenticular lenses on a surface of the substrate, wherein each of the lenticular lenses includes: a middle mirror; and side mirrors positioned on both sides of the middle mirror, wherein a change rate of a surface of the middle mirror is set to be smaller than a change rate of a surface slope of the side mirror on a section perpendicular to an extending direction of the lenticular lens.
In one embodiment, the method comprises: the surface patterns of the middle mirror surface and the side mirror surfaces are set to be surface patterns including at least one of a plane, a convex surface, and a concave surface.
In one embodiment, the method comprises: the absolute value of the surface slope of the intermediate mirror is set to be less than or equal to 0.1 on a section perpendicular to the extending direction of the lenticular lens.
In one embodiment, the method comprises: the maximum value of the absolute value of the surface slope of the side mirror is set to 1.12 or more on a section perpendicular to the extending direction of the lenticular lens.
In one embodiment, a middle projection length of the middle mirror surface is set to be greater than or equal to a side projection length of the side mirror surface, wherein the middle projection length is a length of a perpendicular projection of the middle mirror surface on the substrate along a predetermined direction, and the side projection length is a length of a perpendicular projection of the side mirror surface on the substrate along the predetermined direction.
In one embodiment, a plurality of lenticular lens arrays distributed in parallel to the predetermined direction among the plurality of lenticular lenses are arranged such that a maximum difference h in height of any two of the lenticular lenses in each of the lenticular lens arrays satisfies: h is equal to or greater than λ/(n-1), where λ is the wavelength of the light incident on the lenticular lens and n is the refractive index of the lenticular lens.
In one embodiment, the side mirror comprises a first side mirror and a second side mirror, one on each side of the middle mirror, the method comprising: each of the lenticular lenses is arranged to include at least one of the middle mirror, at least one of the first side mirrors, and at least one of the second side mirrors.
In the exemplary embodiment of the application, the plane shape of the cylindrical lens is designed in a segmented mode, and if the plane shape of the cylindrical lens comprises a middle mirror surface and a side mirror surface, the light emitted by the light source can be diffused in a segmented mode, and the design freedom of a diffused light field of the cylindrical lens is increased.
In the exemplary embodiment of the present application, on the cross section perpendicular to the extending direction of the lenticular lens, the change rate of the surface slope of the middle mirror surface is made smaller than the change rate of the surface slope of the side mirror surface, so that the light efficiency of the lenticular lens diffusing the light field can be ensured, and the energy of the light emitted by the light source is mainly concentrated in the middle light field corresponding to the middle mirror surface of the lenticular lens.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a side view of a diffuser plate according to an embodiment of the present application;
FIG. 2 is a top view of a diffuser plate according to an embodiment of the present application;
FIG. 3 is a schematic representation of the diffusion of a lenticular lens to a light field according to an embodiment of the present application;
fig. 4A to 4C are schematic structural views of a lenticular lens according to an embodiment of the present application;
FIG. 5 is a schematic view of a surface slope distribution of a lenticular lens according to an embodiment of the present application;
FIG. 6 is a schematic view of the spread angle distribution of light emitted by a light source according to an embodiment of the present application;
FIG. 7 is a schematic diagram of light field distribution after passing through a diffuser plate according to an embodiment of the present application;
FIG. 8 is a schematic diagram of random height differences of lenticular lenses according to an embodiment of the present application; and
fig. 9 is a flowchart of a method of manufacturing a diffusion plate according to an embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another feature, and do not denote any limitation of the features, particularly any order of precedence. Thus, a first side mirror discussed in this application may also be referred to as a second side mirror, and vice versa, without departing from the teachings of this application.
In the drawings, the thickness, size, and shape of the components have been slightly adjusted for convenience of description. The figures are merely examples and are not drawn to scale. As used herein, the terms "about," "approximately," and the like are used as terms of a table approximation, not as terms of a table degree, and are intended to account for inherent deviations in measured or calculated values that will be recognized by one of ordinary skill in the art.
It will be further understood that terms such as "comprises," "comprising," "includes," "including," "having," "containing," "includes" and/or "including" are open-ended, rather than closed-ended, terms that specify the presence of the stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features listed, it modifies the entire list of features rather than just modifying the individual elements in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including engineering and technical terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
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 present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
Fig. 1 is a side view of a diffuser plate 1000 according to an embodiment of the present application. The diffusion plate 1000 may include a substrate 1100 and a plurality of lenticular lenses 1200.
The material of the substrate 1100 may be a transparent material. A plurality of lenticular lenses 1200 may be disposed on the surface of the substrate 1100. Illustratively, as shown in fig. 2, a plurality of lenticular lenses 1200 may form an array arrangement on one side surface of the substrate 1100. Illustratively, the lenticular lens 1200 may include a middle mirror 1210 and side mirrors 1220 located on either side of the middle mirror 1210. Illustratively, the side mirror 1220 can include a first side mirror 1221 located on one side of the middle mirror 1210 and a second side mirror 1222 located on the other side of the middle mirror 1210. As shown in fig. 3, the light emitted from the light source L may be incident on the lenticular lens 1200 through the substrate 1100. The present application is advantageous for increasing the design freedom of the diffusing light field of the lenticular lens 1200 by arranging the surface type of the lenticular lens 1200 in segments, such as the first side mirror 1221, the middle mirror 1210 and the second side mirror 1222.
The shape of the middle mirror 1210 can include at least one of a flat surface, a convex surface, and a concave surface. As shown in fig. 4A-4C, the middle mirror 1210 can be planar, convex, or concave in shape. It should be understood that this application exemplifies only the face shape of a portion of the middle mirror 1210. In practical application, the surface shape of the middle mirror 1210 can be reasonably set according to practical requirements. For example, the surface shape of the middle mirror 1210 may be any suitable surface shape such as a combination of a flat surface and a convex surface, a combination of a flat surface and a concave surface, or a combination of a convex surface and a concave surface.
The side mirror 1220 may have a surface shape including at least one of a flat surface, a convex surface, and a concave surface. In other words, the surface shape of the first side mirror 1221 may include at least one of a plane, a convex surface, and a concave surface. The second side mirror 1222 can have a surface shape that includes at least one of a flat surface, a convex surface, and a concave surface. It should be understood that, in practical applications, the surface shapes of the first side mirror 1221 and the second side mirror 1222 may be reasonably set according to practical requirements. For example, the surface shape of the first side mirror 1221 may be any suitable surface shape such as a combination surface shape of a plane surface and a convex surface, a combination surface shape of a plane surface and a concave surface, or a combination surface shape of a convex surface and a concave surface. The second side mirror 1222 can have any suitable surface shape, such as a combination of a flat surface and a convex surface, a combination of a flat surface and a concave surface, and a combination of a convex surface and a concave surface.
Illustratively, each lenticular lens 1200 can include at least one middle mirror 1210, at least one first side mirror 1221, and at least one second side mirror 1222. Although fig. 4A to 4C exemplarily show that one lenticular lens 1200 includes one middle mirror 1210, one first side mirror 1221, and one second side mirror 1222, it should be understood that the number of middle mirrors 1210, first side mirrors 1221, and second side mirrors 1222 that each lenticular lens 1200 may include is not specifically limited in the present application. In practical applications, the number of the middle mirror 1210, the first side mirror 1221, and the second side mirror 1222 that each lenticular lens 1200 may include may be reasonably set according to practical requirements.
Illustratively, as shown in fig. 5, in a cross section perpendicular to the extending direction of the lenticular lens 1200, the rate of change of the surface slope α of the middle mirror 1210 may be smaller than that of the side mirrors 1220. I.e., the rate of change of the surface slope α of the middle mirror 1210 can be smallSlope z of the surface of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 So that there is a sudden change in the slope of the facets between adjacent mirrors. In other words, the change in the surface slope α of the middle mirror 1210 per unit distance may be smaller than the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 Is a variable amount of (a). Illustratively, as shown in FIG. 5, the change in the surface slope α of the middle mirror 1210 at the A-position to the surface slope α of the middle mirror 1210 at the A1-position may be less than the surface slope z of the first side mirror 1221 at the A-position 1 Surface slope z to first side mirror 1221 at position C 1 The amount of change in the surface slope α of the middle mirror 1210 between points A and A1 (i.e., 0.0025 mm) may be less than the surface slope z of the first side mirror 1221 between points A and C (i.e., 0.0025 mm) 1 Is a variable amount of (a). The change in the surface slope α of the middle mirror 1210 at position B to the surface slope α of the middle mirror 1210 at position B1 may be less than the surface slope z of the second side mirror 1222 at position B 2 Surface slope z to second side mirror 1222 at D position 2 The amount of change in the surface slope α of the middle mirror 1210 from point B to point B1 (i.e., 0.0025 mm) may be less than the surface slope z of the second side mirror 1222 from point B to point D (i.e., 0.0025 mm) 1 Is a variable amount of (a). In other words, there may be a sudden change in the slope of the profile of the first side mirror 1221 and the middle mirror 1210 at point a; there may be a sudden change in the slope of the profile of the second side mirror 1222 and the middle mirror 1210 at point B. In the present application, the rate of change of the surface slope refers to the absolute value of the derivative of the surface slope.
Illustratively, the surface slope α of the middle mirror 1210 can satisfy |α|+.0.1, the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 Can satisfy |z 1 |＞0.1，|z 2 I > 0.1. It should be appreciated that the first side mirror 1221 and the second side mirror 1222 can have the same surface slope. Surface slope z of first side mirror 1221 1 Can be matched with the surface slope z of the second side mirror 1222 2 The same applies. When (when)However, the first side mirror 1221 and the second side mirror 1222 can have different surface slopes. Surface slope z of first side mirror 1221 1 Slope z of surface with second side mirror 1222 2 Different. In another exemplary embodiment, the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 The maximum of the absolute values of (2) may be greater than or equal to 1.12. In other words, the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 Can satisfy |z 1 |max≥1.12，|z 2 And the max is more than or equal to 1.12. Typically, as shown in fig. 6, the light emitted by the light source L, such as a VCSEL light source, has a divergence angle, such as a half width of about 20 °. The present application sets the first side mirror 1221 and the second side mirror 1222 to have a larger surface slope (i.e., surface slope z) by setting the middle mirror 1210 to have a smaller surface slope (i.e., surface slope α is smaller) 1 And z 2 Larger) may control the center region of the lenticular lens 1200 to be flatter and the side regions to be steeper. This can improve the light efficiency of the diffusion light field of the lenticular lens 1200, so that the energy of the light emitted by the light source L is mainly concentrated in the middle light field corresponding to the middle region of the lenticular lens 1200 (fig. 7). Illustratively, in the diffuser plate 1000 provided herein, more than 50% of the light may be emitted through the middle mirror 1210.
Illustratively, the surface slope of the side mirror 1220 may be determined based on the diffusion angle of light incident to the lenticular lens 1200 and the refractive index of the lenticular lens 1200. In other words, the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 May be determined based on the diffusion angle of light incident to the lenticular lens 1200 and the refractive index of the lenticular lens 1200. Specifically, the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 The following formula may be satisfied:
wherein,is the diffusion angle of light incident on the lenticular lens 1200, n i Is the refractive index of the lenticular lens 1200. Specifically, the->Can be the diffusion angle of the light emitted by the light source, n i May be the refractive index of the first side mirror and the second side mirror. When->Is the maximum diffusion angle of the light emitted by the light source, z x Then the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 Is a maximum value of (a).
In the present application, refractive index n of first side mirror 1221 and second side mirror 1222 i Can be 1.5, and the maximum diffusion angle of the light emitted by the light sourceMay be 45 deg., at which time the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 May be 2.19. Specifically, as shown in fig. 5 below, the surface slope profiles of the first side mirror 1221, the middle mirror 1210, and the second side mirror 1222.
In the present exemplary embodiment, as shown in fig. 8, a middle projection length H1 of the perpendicular projection of the middle mirror 1210 on the substrate 1100 in the predetermined direction X may be greater than or equal to a side projection length H2 of the perpendicular projection of the side mirror 1220 on the substrate 1110 in the predetermined direction X. In other words, the middle projection length H1 of the perpendicular projection of the middle mirror 1210 onto the substrate 1100 in the predetermined direction X may be greater than or equal to the side projection length sum H2 of the perpendicular projections of the first side mirror 1221 and the second side mirror 1222 onto the substrate 1110 in the predetermined direction X. That is, the ratio of the center projection length H1 of the perpendicular projection of the center mirror 1210 onto the substrate 1100 in the predetermined direction X to the entire projection length H of the perpendicular projection of the lenticular lens 1200 onto the substrate 1100 in the predetermined direction X may be greater than or equal to 0.5. The ratio of light intensity at the position of the side mirror 1220 after light is diffused by the lenticular lens 1200 to total energy can be effectively controlled by controlling the ratio of the central projection length H1 to the sum of the side projection lengths H2. It should be understood that, the larger the middle projection length H1 is, the smaller the sum of the side projection lengths H2 is, the larger the ratio of the middle projection length H1 to the whole projection length H is, the smaller the ratio of the light intensity at the position of the diffused side mirror 1220 to the total energy is, which is more beneficial to making the light intensity at the position of the middle mirror 1210 larger, and thus the light energy at the position of the middle mirror 1210 can be effectively improved, and the light efficiency loss can be reduced. Meanwhile, a small amount of light energy also exists at the position of the side mirror 1220, and in the application scene of the laser radar, the detection of the sky and the ground can be considered while the detection distance of the middle view field is satisfied by improving the light energy at the position of the middle mirror 1210.
In the present exemplary embodiment, the plurality of lenticular lenses 1200 may include a plurality of lenticular lens arrays 1200' distributed in parallel to the predetermined direction X. The lenticular array 1200' may include a series of closely spaced lenticular lenses 1200. Each lenticular lens 1200 can diffuse incident light to achieve a dodging effect. The maximum difference h in height of any two lenticular lenses 1200 in each lenticular lens array 1200' may satisfy: h is equal to or greater than λ/(n-1), where λ is the wavelength of light incident to the lenticular lens and n is the refractive index of the lenticular lens. Illustratively, different random heights may be provided for the lenticular lenses 1200 in each lenticular lens array 1200', and the maximum difference h of the random heights may satisfy: h is greater than or equal to lambda/(n-1). In the present application, the height difference of any two lenticular lenses 1200 in the lenticular lens array 1200' may be in the range of [ -h/2,h/2 ]. Illustratively, the random height difference of any two lenticular lenses 1200 in the lenticular array 1200' may be in the range of [ - λ/2 (n-1), λ/2 (n-1) ]. The smaller the random height maximum difference of any two lenticular lenses 1200 in the lenticular lens array 1200', the more advantageous the processing. For example, the random height difference of any two lenticular lenses 1200 in the lenticular array 1200' may be in the range of [ -940nm,940nm ]. As shown in fig. 8, the present application can effectively suppress diffraction effects due to periodic arrangement of lenticular lens surfaces by providing random height differences between the plurality of lenticular lenses 1200 in each lenticular lens array 1200', so as to satisfy application requirements of laser radars and the like. In an application scenario of the laser radar, the size of the first lenticular lens may be 30um (i.e., the overall projection length H of the vertical projection of the first lenticular lens on the substrate 1100 along the predetermined direction X may be 30 um), the initial height may be 5um, the wavelength λ of light incident to the lenticular lens may be 940nm, the refractive index n of the lenticular lens may be 1.5, and then the maximum value of the height difference between the random second lenticular lens and the first lenticular lens may be 1880nm, i.e., the height of the second lenticular lens may be 4.06um or 5.94um.
Another aspect of the present application provides a method of manufacturing the diffusion plate described above. Fig. 9 is a flowchart of a method 2000 of manufacturing a diffusion plate according to an embodiment of the present application.
The method 2000 of manufacturing a diffusion plate may include: s2100, setting a substrate; and S2200, disposing a plurality of lenticular lenses on a surface of the substrate, wherein each lenticular lens comprises: a middle mirror; and side mirrors positioned on both sides of the middle mirror, wherein the change rate of the surface slope of the middle mirror is set smaller than the change rate of the surface slope of the side mirrors on a section perpendicular to the extending direction of the lenticular lens.
In an exemplary embodiment of the present application, the method 2000 may further include: the surface patterns of the middle mirror surface and the side mirror surfaces are set to a surface pattern including at least one of a plane surface, a convex surface, and a concave surface. As shown in fig. 4A to 4C, the surface shape of the middle mirror 1210 may be set to be flat, convex, or concave. It should be understood that this application exemplifies only the face shape of a portion of the middle mirror 1210. In practical application, the surface shape of the middle mirror 1210 can be reasonably set according to practical requirements. For example, the surface shape of the middle mirror 1210 may be any suitable surface shape such as a combination of a flat surface and a convex surface, a combination of a flat surface and a concave surface, or a combination of a convex surface and a concave surface.
The side mirror 1220 may have a surface shape including at least one of a flat surface, a convex surface, and a concave surface. In other words, the surface shape of the first side mirror 1221 may include at least one of a plane, a convex surface, and a concave surface. The second side mirror 1222 can have a surface shape that includes at least one of a flat surface, a convex surface, and a concave surface. It should be understood that, in practical applications, the surface shapes of the first side mirror 1221 and the second side mirror 1222 may be reasonably set according to practical requirements. For example, the surface shape of the first side mirror 1221 may be any suitable surface shape such as a combination surface shape of a plane surface and a convex surface, a combination surface shape of a plane surface and a concave surface, or a combination surface shape of a convex surface and a concave surface. The second side mirror 1222 can have any suitable surface shape, such as a combination of a flat surface and a convex surface, a combination of a flat surface and a concave surface, and a combination of a convex surface and a concave surface.
Illustratively, each lenticular lens 1200 can include at least one middle mirror 1210, at least one first side mirror 1221, and at least one second side mirror 1222. Although fig. 4A to 4C exemplarily show that one lenticular lens 1200 includes one middle mirror 1210, one first side mirror 1221, and one second side mirror 1222, it should be understood that the number of middle mirrors 1210, first side mirrors 1221, and second side mirrors 1222 that each lenticular lens 1200 may include is not specifically limited in the present application. In practical applications, the number of the middle mirror 1210, the first side mirror 1221, and the second side mirror 1222 that each lenticular lens 1200 may include may be reasonably set according to practical requirements.
In an exemplary embodiment of the present application, the method 2000 may further include: the absolute value of the surface slope of the intermediate mirror surface is set to be 0.1 or less on a section perpendicular to the extending direction of the lenticular lens. Illustratively, the maximum value of the absolute value of the surface slope of the side mirror surface may be set to 1.12 or more on a section perpendicular to the extending direction of the lenticular lens. As shown in FIG. 5, the surface slope α of the middle mirror 1210 may be set to satisfy |α|+.0.1, and the surface slope z of the first side mirror 1221 may be set to 1 And a surface slope z of the second side mirror 1222 2 Is set to satisfy |z 1 |＞0.1，|z 2 I > 0.1. It should be appreciated that the first side mirror 1221 and the second side mirror 1222 can have the same surface slope, i.e., the first side mirror1221 surface slope z 1 Can be matched with the surface slope z of the second side mirror 1222 2 The same applies. Of course, the first side mirror 1221 and the second side mirror 1222 can have different surface slopes, i.e., the surface slope z of the first side mirror 1221 1 Can be matched with the surface slope z of the second side mirror 1222 2 Different. In another exemplary embodiment, the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 The maximum of the absolute values of (2) may be greater than or equal to 1.12. In other words, the surface slope z of the first side mirror 1221 1 And a surface slope z of the second side mirror 1222 2 Can satisfy |z 1 |max≥1.12，|z 2 And the max is more than or equal to 1.12. Typically, as shown in fig. 6, the light emitted by the light source L, such as a VCSEL light source, has a divergence angle, such as a half width of about 20 °. The present application sets the first side mirror 1221 and the second side mirror 1222 to have a larger surface slope (i.e., surface slope z) by setting the middle mirror 1210 to have a smaller surface slope (i.e., surface slope α is smaller) 1 And z 2 Larger) may control the center region of the lenticular lens 1200 to be flatter and the side regions to be steeper. This can improve the light efficiency of the diffusion light field of the lenticular lens 1200, so that the energy of the light emitted by the light source L is mainly concentrated in the middle light field corresponding to the middle region of the lenticular lens 1200 (fig. 7). Illustratively, in the diffuser plate 1000 provided herein, more than 50% of the light may be emitted through the middle mirror 1210.
In the exemplary embodiment of the present application, the middle projection length of the middle mirror surface may be set to be greater than or equal to the side projection length of the side mirror surface, where the middle projection length is a length of a perpendicular projection of the middle mirror surface on the substrate along a predetermined direction, and the side projection length is a length of a perpendicular projection of the side mirror surface on the substrate along the predetermined direction. Specifically, as shown in fig. 8, a middle projection length H1 of the perpendicular projection of the middle mirror 1210 on the substrate 1100 in the predetermined direction X may be greater than or equal to a side projection length H2 of the perpendicular projection of the side mirror 1220 on the substrate 1110 in the predetermined direction X. In other words, the middle projection length H1 of the perpendicular projection of the middle mirror 1210 onto the substrate 1100 in the predetermined direction X may be greater than or equal to the side projection length sum H2 of the perpendicular projections of the first side mirror 1221 and the second side mirror 1222 onto the substrate 1110 in the predetermined direction X. That is, the ratio of the central projection length H1 of the perpendicular projection of the central mirror 1210 onto the substrate 1100 in the predetermined direction X to the entire projection length H of the perpendicular projection of the lenticular lens 1200 onto the substrate 1100 in the predetermined direction X may be greater than 0.5. The ratio of light intensity at the position of the side mirror 1220 after light is diffused by the lenticular lens 1200 to total energy can be effectively controlled by controlling the ratio of the central projection length H1 to the sum of the side projection lengths H2. It should be understood that, the larger the middle projection length H1 is, the smaller the sum of the side projection lengths H2 is, the larger the ratio of the middle projection length H1 to the whole projection length H is, the smaller the ratio of the light intensity at the position of the diffused side mirror 1220 to the total energy is, which is more beneficial to making the light intensity at the position of the middle mirror 1210 larger, and thus the light energy at the position of the middle mirror 1210 can be effectively improved, and the light efficiency loss can be reduced. Meanwhile, a small amount of light energy also exists at the position of the side mirror 1220, and in the application scene of the laser radar, the detection of the sky and the ground can be considered while the detection distance of the middle view field is satisfied by improving the light energy at the position of the middle mirror 1210.
In the present exemplary embodiment, a plurality of lenticular lens arrays distributed in parallel to a predetermined direction among a plurality of lenticular lenses may be arranged such that a maximum difference h in height of any two lenticular lenses in each lenticular lens array satisfies: h is equal to or greater than λ/(n-1), where λ is the wavelength of light incident to the lenticular lens and n is the refractive index of the lenticular lens. Illustratively, different random heights may be provided for the lenticular lenses 1200 in each lenticular lens array 1200', and the maximum difference h of the random heights may satisfy: h is greater than or equal to lambda/(n-1). In the present application, the height difference of any two lenticular lenses 1200 in the lenticular lens array 1200' may be in the range of [ -h/2,h/2 ]. Illustratively, the random height difference of any two lenticular lenses 1200 in the lenticular array 1200' may be in the range of [ - λ/2 (n-1), λ/2 (n-1) ]. The smaller the random height maximum difference of any two lenticular lenses 1200 in the lenticular lens array 1200', the more advantageous the processing. For example, the random height difference of any two lenticular lenses 1200 in the lenticular array 1200' may be in the range of [ -940nm,940nm ]. As shown in fig. 8, the present application can effectively suppress diffraction effects due to periodic arrangement of lenticular lens surfaces by providing random height differences between the plurality of lenticular lenses 1200 in each lenticular lens array 1200', so as to satisfy application requirements of laser radars and the like. In an application scenario of the laser radar, the size of the first lenticular lens may be 30um (i.e., the overall projection length H of the vertical projection of the first lenticular lens on the substrate 1100 along the predetermined direction X may be 30 um), the initial height may be 5um, the wavelength λ of light incident to the lenticular lens may be 940nm, the refractive index n of the lenticular lens may be 1.5, and then the maximum value of the height difference between the random second lenticular lens and the first lenticular lens may be 1880nm, i.e., the height of the second lenticular lens may be 4.06um or 5.94um.
The above description is merely illustrative of the implementations of the application and of the principles of the technology applied. It should be understood by those skilled in the art that the scope of protection referred to in this application is not limited to the specific combination of the above technical features, but also encompasses other technical solutions formed by any combination of the above technical features or their equivalents without departing from the technical concept. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (10)
1. A diffuser plate, comprising:
a substrate; and
a plurality of lenticular lenses disposed on a surface of the substrate, wherein each of the lenticular lenses includes:
a middle mirror; and
side mirror surfaces positioned on both sides of the middle mirror surface,
wherein, on a section perpendicular to the extending direction of the lenticular lens, the change rate of the surface slope of the middle mirror surface is smaller than that of the side mirror surface.
2. The diffusion plate according to claim 1, wherein an absolute value of a surface slope of the middle mirror surface is less than or equal to 0.1 in a cross section perpendicular to the extending direction of the lenticular lens.
3. The diffuser plate of claim 1, wherein the face shapes of the middle and side mirrors comprise at least one of a flat surface, a convex surface, and a concave surface.
4. The diffusion plate according to claim 2, wherein a maximum value of an absolute value of a surface slope of the side mirror is 1.12 or more in a cross section perpendicular to the extending direction of the lenticular lens.
5. The diffuser plate of claim 4 wherein said side mirrors include first and second side mirrors on opposite sides of said middle mirror,
the maximum value of the absolute value of the surface slope of at least one of the first side mirror surface and the second side mirror surface is 1.12 or more in a cross section perpendicular to the extending direction of the lenticular lens.
6. The diffuser plate of claim 5 wherein each of said lenticular lenses includes at least one of said middle mirror, at least one of said first side mirror, and at least one of said second side mirror.
7. The diffuser plate of claim 1, wherein a center projected length of a perpendicular projection of the center mirror onto the substrate in a predetermined direction is greater than or equal to a side projected length of a perpendicular projection of the side mirror onto the substrate in the predetermined direction.
8. The diffuser plate of claim 7 wherein the lenticular lens receives light from a light source wherein greater than or equal to 50% of the light is emitted through the central mirror.
9. The diffuser plate of claim 7, wherein said plurality of lenticular lenses comprises a plurality of lenticular lens arrays distributed in a direction parallel to said predetermined direction,
the maximum difference h of the heights of any two of the lenticular lenses in each lenticular lens array satisfies: h is equal to or greater than λ/(n-1), where λ is the wavelength of light incident to the lenticular lens and n is the refractive index of the lenticular lens.
10. A method of manufacturing a diffuser plate, comprising:
setting a substrate;
disposing a plurality of lenticular lenses on a surface of the substrate, wherein each of the lenticular lenses includes:
a middle mirror; and
side mirror surfaces positioned on both sides of the middle mirror surface,
wherein, on a section perpendicular to the extending direction of the lenticular lens, the change rate of the surface slope of the middle mirror surface is set smaller than that of the side mirror surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210670946.3A CN117250676A (en) | 2022-06-10 | 2022-06-10 | Diffusion plate and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210670946.3A CN117250676A (en) | 2022-06-10 | 2022-06-10 | Diffusion plate and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117250676A true CN117250676A (en) | 2023-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210670946.3A Pending CN117250676A (en) | 2022-06-10 | 2022-06-10 | Diffusion plate and manufacturing method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN117250676A (en) |
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2022
- 2022-06-10 CN CN202210670946.3A patent/CN117250676A/en active Pending
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