CN111025670B - Infrared light diffusion sheet and optical system - Google Patents
Infrared light diffusion sheet and optical system Download PDFInfo
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- CN111025670B CN111025670B CN201911330959.0A CN201911330959A CN111025670B CN 111025670 B CN111025670 B CN 111025670B CN 201911330959 A CN201911330959 A CN 201911330959A CN 111025670 B CN111025670 B CN 111025670B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
-
- 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
- G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
-
- 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
-
- 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
- G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
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- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
The invention provides an infrared light diffusion sheet and an optical system. The infrared light diffusion sheet includes: a substrate; the dielectric layer is positioned on the substrate and comprises a plurality of dielectric units, and the plurality of dielectric units are arranged on the substrate at intervals; the dielectric layer further comprises a plurality of micro lenses, the micro lenses are arranged at intervals, the height of each micro lens is smaller than the length of the micro lens, and the distance between every two adjacent micro lenses is smaller than the length of the micro lens. The invention solves the problem that the diffusion sheet in the prior art can not be miniaturized and uniformly emit light at the same time.
Description
Technical Field
The invention relates to the technical field of optical imaging equipment, in particular to an infrared light diffusion sheet and an optical system.
Background
In the fields such as AR and VR which need 3D optical sensing, a scene must be illuminated by a light source with a certain spatial distribution and time distribution, and the distance from each position in the scene to the light source, that is, the depth, is restored according to the change of the spatial distribution and time distribution of the reflected light of the scene, so that the obtained depth map is the basis for various AR and VR applications.
Due to the nature of the solar spectrum in the environment, the wavelength of the light emitted by the light source is preferably in the infrared region in the range of 800-1000nm to reduce visible light interference. The light source generally uses a VSCEL laser or an array thereof, and the emitted coherent light passes through the DOE to form a spot pattern with a certain spatial distribution, or passes through a light diffusion sheet to form a uniform light pattern with a uniform spatial distribution but modulated in phase, time, and the like. As electronic devices become more miniaturized, there is a growing need for diffusers to meet the miniaturization demand.
That is, the diffusion sheet in the prior art has the problem that the miniaturization and the uniform light emission cannot be achieved at the same time.
Disclosure of Invention
The invention mainly aims to provide an infrared light diffusion sheet and an optical system, so as to solve the problem that the miniaturization and uniform light emission of the diffusion sheet in the prior art can not be realized at the same time.
In order to achieve the above object, according to one aspect of the present invention, there is provided an infrared light diffusion sheet including: a substrate; the dielectric layer is positioned on the substrate and provided with a plurality of dielectric units, the dielectric layer comprises a plurality of dielectric units, and the plurality of dielectric units are arranged on the substrate at intervals; the dielectric layer further comprises a plurality of micro lenses, the micro lenses are arranged at intervals, the height of each micro lens is smaller than the length of the micro lens, and the distance between every two adjacent micro lenses is smaller than the length of the micro lens.
Further, the dielectric unit is located at least on a surface of the microlens.
Furthermore, the infrared light diffusion sheet also comprises an antireflection film, wherein the antireflection film is positioned on the surface of the substrate on the side opposite to the dielectric layer; and/or the infrared light diffusion sheet further comprises a filter on a surface of the substrate on a side opposite to the dielectric layer.
Further, the abbe number of the materials of the substrate and the dielectric layer is larger than 40.
Further, the material of the substrate has a refractive index greater than 1.5 and less than 1.751 for light having a wavelength in the range of 850nm to 1010 nm; the material of the dielectric layer has a refractive index greater than 1.4 and less than 1.6 for light having a wavelength in the range 850nm to 1010 nm.
Further, a plurality of microlenses form a periodic array, and the microlenses are arranged at equal intervals.
Further, the distance between two adjacent microlenses is greater than or equal to 1 micrometer and less than or equal to 20 micrometers.
Further, the height of the micro lens is more than or equal to 1 micron and less than or equal to 50 microns; the length of the micro lens is greater than or equal to 5 micrometers and less than or equal to 200 micrometers.
Further, the thickness of the substrate is greater than or equal to 0.1 mm and less than or equal to 0.6 mm; and/or the length of the infrared light diffusion sheet is more than or equal to 2 mm and less than or equal to 4 mm, and the width of the infrared light diffusion sheet is more than or equal to 3 mm and less than or equal to 6 mm.
According to another aspect of the present invention, there is provided an optical system including: a laser light source; the infrared light diffusion sheet is positioned in the emergent direction of the laser light source so as to diffuse the light emitted by the laser light source; and the projection lens is positioned in the emergent direction of the diffused light of the infrared light diffusion sheet to form an image.
By applying the technical scheme of the invention, the infrared light diffusion sheet comprises a substrate and a dielectric layer, wherein the dielectric layer is positioned on the substrate and comprises a plurality of dielectric units, and the plurality of dielectric units are arranged on the substrate at intervals; the dielectric layer further comprises a plurality of micro lenses, the micro lenses are arranged at intervals, the height of each micro lens is smaller than the length of the micro lens, and the distance between every two adjacent micro lenses is smaller than the length of the micro lens.
By providing the dielectric layer on the infrared light diffusion sheet, when the infrared light diffusion sheet is irradiated with laser light, the surface of the infrared light diffusion sheet is changed, so that the diffraction efficiency of the laser light is increased, and the transmittance of the infrared light is increased. The dielectric units are arranged to enable the dielectric units and the substrate to have different refractive indexes, so that the optical path of light penetrating through the infrared light diffusion sheet is changed, and more uniform emergent light is formed. The micro-lenses can also change the process of the light passing through the infrared light diffusion sheet so as to further increase the uniformity of the emergent light. The optical path can be further changed by changing the refractive indexes of the dielectric unit and the substrate, so that the influence of the micro lens on the optical path can be reduced, the height of the micro lens is reduced, and the effect of realizing both miniaturization and uniform light emission of the infrared light diffusion sheet is realized.
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 is a schematic view showing the overall structure of an infrared light diffusion sheet according to an alternative embodiment of the present invention; and
fig. 2 shows an angled view of the infrared light diffusor sheet of fig. 1.
Wherein the figures include the following reference numerals:
10. a substrate; 20. a microlens.
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 an infrared light diffusion sheet and an optical system, aiming at solving the problem that the diffusion sheet in the prior art cannot be miniaturized and can not realize uniform light emission.
As shown in fig. 1 to 2, the infrared light diffusion sheet includes a substrate 10 and a dielectric layer, the dielectric layer is located on the substrate 10, the dielectric layer includes a plurality of dielectric units, and the plurality of dielectric units are arranged on the substrate 10 at intervals; the dielectric layer further includes a plurality of microlenses 20, the microlenses 20 are arranged at intervals, the height of each microlens 20 is smaller than the length of the microlens 20, and the distance between two adjacent microlenses 20 is smaller than the length of the microlens 20.
By providing the dielectric layer on the infrared light diffusion sheet, when the infrared light diffusion sheet is irradiated with laser light, the surface of the infrared light diffusion sheet is changed, so that the diffraction efficiency of the laser light is increased, and the transmittance of the infrared light is increased. The dielectric units are arranged to enable the dielectric units and the substrate to have different refractive indexes, so that the optical path of light penetrating through the infrared light diffusion sheet is changed, and more uniform emergent light is formed. The micro-lenses 20 can also change the light passing through the infrared diffuser to further increase the uniformity of the exiting light. The optical path can be further changed by changing the refractive indexes of the dielectric unit and the substrate, so that the influence of the micro lens 20 on the optical path can be reduced, the height of the micro lens 20 is reduced, and the effect of realizing both miniaturization and uniform light emission of the infrared light diffusion sheet is realized.
Note that, in the present application, the length of the microlens 20 refers to the maximum length of the microlens 20 parallel to the substrate 10, and the height of the microlens 20 refers to the maximum height in the direction perpendicular to the substrate 10.
In this application, the infrared light diffusion piece can be with the even emergent light that the transmissivity is high, the diffractometry is high with infrared light diffusion, and this infrared light diffusion piece is applicable to AR (augmented reality) sensing light source and the module of TOF (time of flight method 3D formation of image) class.
The dielectric element is a dielectric material.
In the present embodiment, the dielectric unit is located at least on the surface of the microlens 20. The optical path difference of the emergent light can be reduced by the arrangement, so that the light intensity of the emergent light is more uniform, and more uniform images can be obtained.
Optionally, the infrared light diffusion sheet further includes an antireflection film on a surface of the substrate 10 on the side opposite to the dielectric layer; and/or the infrared light diffusor sheet further comprises a filter on the surface of the substrate 10 opposite the dielectric layer. The reflection of light on the infrared light diffusion sheet can be reduced by arranging the antireflection film on the infrared light diffusion sheet, the light transmission amount of the infrared light diffusion sheet is increased, the light transmittance of the infrared light diffusion sheet is further increased, and meanwhile, stray light can be reduced by the antireflection film. The filter plate can allow infrared light to pass through, and influence of other light on the infrared light is reduced. And the antireflection film and the filter are disposed on the surface of the substrate 10 on the side opposite to the dielectric layer, so that the influence of the antireflection film and the filter on the dielectric layer can be reduced, and the dielectric layer can stably operate. The antireflection film may include common materials such as silicon nitride, silicon dioxide, titanium dioxide, and aluminum oxide, and may also include an organic polymer.
It should be noted that the filter in this embodiment is preferably an infrared narrow-band filter, and of course, the type of the filter may be set according to the requirement of the light to be filtered actually.
In this embodiment, the infrared light diffusion sheet may be provided with a functional film for preventing static electricity, cracking, and increasing hardness. In order to protect the periodic microlenses 20 on the dielectric layer, these functional films are preferably arranged on the surface of the substrate 10 on the side opposite to the dielectric layer.
In this embodiment, the abbe number of the materials of the substrate 10 and the dielectric layer is greater than 40. Having the abbe numbers of the materials of substrate 10 and the dielectric layers greater than 40 reduces dispersion and distortion of the image that emerges through the infrared diffuser.
In the present embodiment, the refractive index of the material of the substrate 10 for light having a wavelength in the range of 850nm to 1010nm is greater than 1.5 and less than 1.751. The arrangement is such that light can be greatly deflected when entering the substrate 10, so as to be reflected and scattered inside the infrared light diffusion sheet, thereby increasing the uniformity of emergent light of the infrared light diffusion sheet. The material of the substrate 10 may be various types of optical glass, preferably optical glass having an abbe number of more than 50. The abbe number of the material of the substrate 10 may be 55, 60, 65, 70, 80, etc. The refractive index of the material of the substrate 10 for light having a wavelength in the range of 850nm to 1010 may be 1.55, 1.6, 1.7, 1.73, etc.
In the present embodiment, the refractive index of the material of the dielectric layer for light having a wavelength in the range of 850nm to 1010nm is greater than 1.4 and less than 1.6. This arrangement can increase the uniformity of the outgoing light from the infrared light diffusion sheet. The dielectric layer can be made of various plastics or resins, and specifically, can be made of various similar polymers such as polycarbonate, polystyrene, polyethylene terephthalate, polyethylene naphthalate, polypropylene, polymethyl methacrylate, polyolefin, or the like, or a combination thereof. The material of the dielectric layer may have a refractive index of 1.45, 1.5, 1.55, etc. for light having a wavelength in the range of 850nm to 1010 nm.
The material of the dielectric layer is preferably a plastic or resin having an abbe number greater than 40, for example, the abbe number of the material of the dielectric layer may be 45, 50, 55, 60, 65, 70, 80, etc.
To meet the requirements of the TOF module for the angle of ray spread in the application, the refractive index of the material of the dielectric layer is preferably slightly less than the refractive index of the substrate 10.
As shown in fig. 1 to 2, a plurality of microlenses 20 form a periodic array, and the microlenses 20 are arranged at equal intervals. The microlenses 20 are periodically arranged, so that the infrared light diffusion sheets can be conveniently manufactured, the consistency of the infrared light diffusion sheets in the mass production process can be increased, and the difference between the produced infrared light diffusion sheets can be reduced.
As shown in fig. 1 to 2, the microlens 20 is square in the present embodiment, but is not limited to the square. The microlens 20 may be a hemisphere, an aspherical curved surface, a free curved surface, a saddle, a pillar, or any other shape as long as it has a shape or a change in refractive index that enables a change in the optical path difference of transmitted light.
The periodic array may be fabricated by micro-fabrication techniques such as imprinting, photolithography, and electron beam exposure, and is preferably fabricated in a large area using a template and then diced. In the case of imprinting, a dielectric layer is first applied to the substrate 10, then the temperature is raised to soften the dielectric layer material and the mold is pressed against the dielectric layer to form a two-dimensional periodic array or the reverse pattern, and finally the pattern is transferred to the glass substrate by pattern transfer through plating or direct etching. In the case of photolithography, after a photosensitive dielectric such as PMMA is coated on the substrate 10, exposure is performed by irradiating a laser beam with a flood film or directly by a spatially encoded laser beam, and finally the exposed portion is removed by a developing solution, leaving a pattern.
In the present embodiment, the distance between two adjacent microlenses 20 is greater than or equal to 1 micrometer and less than or equal to 20 micrometers. The diffraction effect can be reduced by the arrangement, and the difficulty of mass production can be reduced.
In the present embodiment, the height of the microlens 20 is 1 micron or more and 50 microns or less; the length of the microlens 20 is 5 micrometers or more and 200 micrometers or less. This arrangement allows the infrared light diffusion sheet to have high transmittance and high diffraction efficiency.
In order to achieve a balance between high transmittance and high diffraction efficiency and a suitable exit angle, the relationship between the size of the microlenses 20 and the pitch of the adjacent microlenses 20 should be optimized, and reducing the height of the microlenses 20 is advantageous in reducing the manufacturing difficulty. Therefore, the height H of each microlens 20, the length D of each microlens 20, and the spacing D between two adjacent microlenses 20 satisfy: h < D, D < D.
Preferably, H < D/2, D < D/2.
In the present application, high transmittance means transmittance of more than 90%, and high diffraction efficiency means diffraction efficiency of more than 70%. The diffraction efficiency is defined as the proportion of the part with more than 10% of the central energy of the emergent light field in the energy of all the emergent light fields. A suitable exit angle is an exit angle greater than 60 degrees. The exit angle is defined as the spatial angle of the distribution of the exiting light field in the X and Y directions.
In the present embodiment, the thickness of the substrate 10 is 0.1 mm or more and 0.6 mm or less. The arrangement can ensure the structural strength of the infrared light diffusion sheet, so that the infrared light diffusion sheet can be stably used. In addition, the limitation of the thickness of the substrate 10 to the range of 0.1 mm to 0.6 mm can ensure miniaturization of the substrate, so that the infrared light diffusion sheet is suitable for a small lens.
In this embodiment, the length of the infrared light diffusion sheet is greater than or equal to 2 mm and less than or equal to 4 mm, and the width of the infrared light diffusion sheet is greater than or equal to 3 mm and less than or equal to 6 mm. This arrangement allows the infrared light diffusing sheet to be adapted to a small optical module, preferably a TOF module.
In this embodiment, the infrared light diffusion sheet is a rectangle, the length of the infrared light diffusion sheet is the length of the longest side of the infrared light diffusion sheet, and the width of the infrared light diffusion sheet is the length of the short side of the infrared light diffusion sheet.
The optical system comprises a laser light source, the infrared light diffusion sheet and a projection lens, wherein the infrared light diffusion sheet is positioned in the emergent direction of the laser light source so as to diffuse light emitted by the laser light source; the projection lens is positioned in the emergent direction of the diffused light of the infrared light diffusion sheet to form an image. The surface of the substrate 10 on the side opposite to the dielectric layer is disposed toward the laser light source, and the side having the dielectric layer is disposed toward the transmission lens to make the light emitted from the infrared light diffusion sheet more uniform.
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 description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An infrared light diffusing sheet, comprising:
a substrate (10);
a dielectric layer which is located on the substrate (10), wherein the dielectric layer comprises a plurality of dielectric units, the plurality of dielectric units are arranged on the substrate (10) at intervals, and when the infrared light diffusion sheet is irradiated by laser, the surface of the infrared light diffusion sheet is changed, so that the diffraction efficiency and the transmittance of the laser are increased;
the dielectric layer further comprises a plurality of micro lenses (20), the micro lenses (20) are arranged at intervals, the height of each micro lens (20) is smaller than the length of the micro lens (20), and the distance between every two adjacent micro lenses (20) is smaller than the length of the micro lens (20);
the refractive index of the material of the substrate (10) for light having a wavelength in the range of 850nm to 1010nm is greater than 1.5 and less than 1.751; the dielectric layer is made of a material having a refractive index of greater than 1.4 and less than 1.6 for light having a wavelength in the range of 850nm to 1010 nm.
2. The infrared light diffuser sheet according to claim 1, wherein the dielectric unit is located at least on the surface of the microlenses (20).
3. The infrared light diffusing sheet according to claim 1,
the infrared light diffusion sheet further comprises an antireflection film on a surface of the substrate (10) on a side opposite to the dielectric layer; and/or
The infrared light diffusion sheet further comprises a filter on a surface of the substrate (10) on a side opposite to the dielectric layer.
4. The infrared light diffuser sheet according to claim 1, wherein the abbe number of the material of the substrate (10) and the dielectric layer is greater than 40.
5. An infrared light diffusing sheet according to any one of claims 1 to 4, wherein a plurality of the microlenses (20) form a periodic array, and each of the microlenses (20) is arranged at equal intervals.
6. The infrared light diffusion sheet according to claim 5, wherein the distance between two adjacent microlenses (20) is greater than or equal to 1 micrometer and less than or equal to 20 micrometers.
7. The infrared light diffusion sheet according to any one of claims 1 to 4,
the height of the micro lens (20) is more than or equal to 1 micron and less than or equal to 50 microns;
the length of the micro lens (20) is greater than or equal to 5 micrometers and less than or equal to 200 micrometers.
8. The infrared light diffusion sheet according to any one of claims 1 to 4,
the thickness of the substrate (10) is greater than or equal to 0.1 mm and less than or equal to 0.6 mm; and/or
The length of the infrared light diffusion sheet is greater than or equal to 2 mm and less than or equal to 4 mm, and the width of the infrared light diffusion sheet is greater than or equal to 3 mm and less than or equal to 6 mm.
9. An optical system, comprising:
a laser light source;
the infrared light diffusion sheet as set forth in any one of claims 1 to 8, which is located in an exit direction of the laser light source to diffuse light emitted from the laser light source;
and the projection lens is positioned in the emergent direction of the diffused light of the infrared light diffusion sheet so as to form an image.
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| CN201911330959.0A CN111025670B (en) | 2019-12-20 | 2019-12-20 | Infrared light diffusion sheet and optical system |
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| CN201911330959.0A CN111025670B (en) | 2019-12-20 | 2019-12-20 | Infrared light diffusion sheet and optical system |
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| JP5498027B2 (en) * | 2009-01-30 | 2014-05-21 | 株式会社ジロオコーポレートプラン | Optical sheet for liquid crystal display device and backlight unit using the same |
| JP7391495B2 (en) * | 2018-02-14 | 2023-12-05 | デクセリアルズ株式会社 | Diffusion plate, diffusion plate design method, display device, projection device, and lighting device |
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| JP2003121609A (en) * | 2001-10-11 | 2003-04-23 | Hitachi Ltd | Optical sheet and display device equipped with the same |
| CN103185907A (en) * | 2011-12-30 | 2013-07-03 | 爱思开哈斯显示用薄膜有限公司 | Micro optical lens and backlight unit and liquid display using micro optical lens |
| CN103511913A (en) * | 2012-06-28 | 2014-01-15 | 鑫成科技(成都)有限公司 | Backlight module, liquid crystal display device and light source module |
| CN107179572A (en) * | 2016-03-11 | 2017-09-19 | 台达电子工业股份有限公司 | Diffuser, LASER Light Source module and its preparation method using it |
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