CN111338008A - Light-transmitting cover plate and optical device - Google Patents
Light-transmitting cover plate and optical device Download PDFInfo
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- CN111338008A CN111338008A CN202010144509.9A CN202010144509A CN111338008A CN 111338008 A CN111338008 A CN 111338008A CN 202010144509 A CN202010144509 A CN 202010144509A CN 111338008 A CN111338008 A CN 111338008A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/46—Indirect determination of position data
- G01S17/48—Active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
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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
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a light-transmitting cover plate and an optical device, wherein the light-transmitting cover plate comprises: the light homogenizing structure is integrally formed on the cover plate body; the light homogenizing structure is composed of a plurality of at least one micro lens unit, and the micro lens unit comprises: a first microlens and a second microlens. The cover plate body and the light homogenizing structure are integrally arranged, so that the light source module is simplified into the laser bare chip, the cost is greatly reduced, the size of the light source module is far larger than that of the laser bare chip, the number of light sources is increased under the high-power requirement, and the bare chip arrangement also saves a large amount of PCB (printed circuit board) arrangement space compared with the light source module arrangement. In addition, only need use the processing cost of laser apron, both can realize the structure function demand of apron, realize the optical function of even slide simultaneously, more importantly, the light source only need through optical lens transmission once and go out, and the light efficiency has obviously promoted, has reduced the complete machine consumption.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a light-transmitting cover plate and an optical device.
Background
The current laser ranging device, such as the tof camera, the light source emitting end of the current laser ranging device includes a laser module and a laser transparent cover. The laser module is formed by packaging a laser bare chip and a light homogenizing sheet (diffuser), and mainly meets the illumination requirement required by laser testing. The laser module emits illumination beams to project illumination spots through the laser transparent cover. In the implementation mode, from the optical perspective, light firstly passes through diffuer, the transmittance is about 85%, then passes through the laser transparent cover, the luminous efficiency is about 85%, and therefore the light is transmitted twice, and the light loss is large. From the cost perspective, the dodging sheet mostly uses the buffer of the american RPC company, which is expensive, and the light source module is far more expensive than the laser bare chip. Therefore, it is necessary to provide a further solution to the above problems.
Disclosure of Invention
The invention aims to provide a light-transmitting cover plate and an optical device to overcome the defects in the prior art.
To achieve the above object, the present invention provides a light-transmitting cover plate, including: the light homogenizing structure is integrally formed on the cover plate body;
the light homogenizing structure is composed of a plurality of at least one micro lens unit, and the micro lens unit comprises: a first microlens and a second microlens;
the lens curved surface of the first micro lens is determined by a CNC process fillet, the first micro lens has a first light-emitting effect, the minimum curvature radius of the lens curved surface of the second micro lens is at least larger than any curvature radius of the lens curved surface of the first micro lens, the second micro lens has a second light-emitting effect, and the second light-emitting effect is designed to be complementary to a light spot formed by the first micro lens and a light spot formed by the second micro lens in an imaging surface, so that the light-transmitting cover plate has a required light-emitting effect.
As an improvement of the light-transmitting cover plate of the present invention, the first microlenses are distributed on the peripheral sides of the second microlenses.
As an improvement of the light-transmitting cover plate, the first micro lens is polygonal, the first micro lens comprises a plurality of arched curved surfaces, and the edges of the adjacent arched curved surfaces are smoothly connected.
As an improvement of the light-transmitting cover plate of the present invention, the first microlens includes: the device comprises a first arched curved surface arranged oppositely in the X direction, a second arched curved surface arranged oppositely in the Y direction and a third arched curved surface smoothly connecting the first arched curved surface and the second arched curved surface.
As an improvement of the light-transmitting cover plate, the first micro lenses are distributed at the local positions on the peripheral sides of the second micro lenses.
As an improvement of the light-transmitting cover plate, the processing method comprises the following steps: the method comprises the steps that a first micro lens is determined by a minimum round corner of a CNC (computerized numerical control) process, the first lens has a first light-emitting effect, a second micro lens is simulated according to the first micro lens, so that the second micro lens has a second light-emitting effect, the second light-emitting effect is designed to be that a light spot formed by the first micro lens is complementary to a light spot formed by the second micro lens on an imaging surface, and the light-transmitting cover plate has a required light-emitting effect, wherein the minimum curvature radius of a lens curved surface of the second micro lens is at least larger than any curvature radius of the first micro lens.
As an improvement of the light-transmitting cover plate, when the number of the micro lens units is multiple, the micro lens units are arranged on the cover plate body in an array form.
As an improvement of the light-transmitting cover plate, the cover plate body and the light homogenizing structure on the cover plate body are integrally formed by adopting the same material.
As an improvement of the light-transmitting cover plate, the cover plate body is also provided with an installation structure suitable for assembling the light-transmitting cover plate.
To achieve the above object, the present invention provides an optical device comprising: the light source, the light-transmitting cover plate that is located on the light source light path.
Compared with the prior art, the invention has the beneficial effects that: the cover plate body and the light homogenizing structure are integrally arranged, so that the light source module is simplified into the laser bare chip, the cost is greatly reduced, the size of the light source module is far larger than that of the laser bare chip, the number of light sources is increased under the high-power requirement, and the bare chip arrangement also saves a large amount of PCB (printed circuit board) arrangement space compared with the light source module arrangement. In addition, only need use the processing cost of laser apron, both can realize the structure function demand of apron, realize the optical function of even slide simultaneously, more importantly, the light source only need through optical lens transmission once and go out, and the light efficiency has obviously promoted, has reduced the complete machine consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic perspective view of an embodiment of a transparent cover plate according to the present invention;
FIG. 2 is a front view of embodiment 1 of a microlens unit of the present invention;
FIGS. 3-5 are schematic views showing the positional relationship among the first, second and third arcuate surfaces in FIG. 1;
FIG. 6 is a front view of embodiment 3 of a microlens unit of the present invention;
FIG. 7 is a perspective view of a plurality of microlens units according to the present invention;
fig. 8 is a perspective view illustrating a case where a plurality of microlens units are provided according to the present invention.
Detailed Description
The present invention is described in detail below with reference to various embodiments, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should be able to make modifications and substitutions on the functions, methods, or structures of these embodiments without departing from the scope of the present invention.
The technical conception of the invention is as follows: since a laser cover plate, light source, and optically effective diffuser are essential to the tof camera and are desirably implemented with minimal cost and simplest assembly, it is contemplated that integrating a self-lapping light sheet with the cover plate provides at least the following substantial benefits: (1) the light homogenizing sheet cost and the laser cover plate cost are combined into one, namely the expensive U.S. monopoly diffuser cost (purchased according to a light source module with the diffuser, the price is 60 rmb) is saved, according to the scheme provided by the invention, the light source bare chip is 10rmb, the cover plate unit price is 1rmb, 49rmb is saved, and (2) the size of the diffuser light source module is at least 5-10 times that of the bare chip, under the condition of high power, the space of a PCB (printed circuit board) is greatly reduced, and the whole structural space of a transmitting end can be made very small. (3) The light source modules on the market are limited in lighting angle, the customization cost is about 2 million dollars, the self-polishing light is more free, and the light source modules can be designed at any angle. (4) The optical assembly is completed by completing the assembly of the laser cover plate, and the assembly is simplified. (5) Light only penetrates through the laser cover plate once, and the lighting effect is greatly saved.
The object of the present invention is to provide a light-transmitting cover plate, comprising: the light-homogenizing structure comprises a cover plate body 100 and a light-homogenizing structure 200 formed on the cover plate body 100, wherein the light-homogenizing structure 200 is integrally formed on the cover plate body 100.
The light uniformizing structure 200 is composed of a plurality of at least one microlens unit, and the microlens unit includes: a first microlens and a second microlens. When the number of the microlens units is plural, the plurality of microlens units are arranged on the cover plate body 100 in an array form.
The cover plate body 100 and the light homogenizing structure 200 thereon may be made of the same material, so that the cover plate body 100 and the light homogenizing structure 200 thereon are integrally formed. The cover plate body 100 is further provided with a mounting structure 101 suitable for assembling the light-transmitting cover plate, specifically, the mounting structure 101 is a protruding screw hole arranged at four corners of the cover plate body 100.
The microlens unit includes: the first micro lens and the second micro lens are respectively provided with a convex lens curved surface.
The first micro lens and the second micro lens are arranged in an optical complementary manner, wherein the complementary arrangement is mainly realized by arranging lens curved surfaces and a position structure relationship of the two micro lenses to obtain a proper light-emitting angle.
Specifically, the lens curved surface of the first microlens is determined by a CNC process fillet, the first microlens has a first light emitting effect, the minimum curvature radius of the lens curved surface of the second microlens is at least larger than any curvature radius of the lens curved surface of the first microlens, the second microlens has a second light emitting effect, and the second light emitting effect is designed such that a light spot formed by the first microlens and a light spot formed by the second microlens are complementary in an imaging surface, so that the microlens unit has a required light emitting effect.
Based on the technical concept, in an implementation manner, the microlens units may be arranged in a one-dimensional plane, and alternatively, may also be spatially arranged in planes of different dimensions. When the microlens array is arranged in planes with different dimensions, one microlens unit can be distributed in different spatial dimensions, or a plurality of microlens units can be respectively distributed in different spatial dimensions. That is, the first microlens and/or the second microlens may be disposed in a plane of one dimension, and the first microlens and/or the second microlens may be disposed in cooperation therewith in a plane of another dimension. Or a microlens unit is arranged in a plane of one dimension, and another microlens unit is arranged in a plane of the other dimension according to the spatial orientation matched with the microlens unit.
Further, when the microlens units are arranged in planes with different dimensions, the first microlenses and/or the second microlenses distributed in different spatially-different planes are arranged, that is, the projections of the first microlenses in different planes in one plane are kept to be non-overlapping, and the projections of the second microlenses in different planes in one plane are kept to be non-overlapping
The micro lens units are correspondingly arranged in shape according to the required light spot shape. Specifically, when a circular light spot needs to be formed, the shape of the microlens unit is approximately circular; when a polygonal light spot needs to be formed, the shape of the micro lens unit is approximately polygonal; when the special-shaped light spot needs to be formed, the shape of the micro lens unit is approximately special-shaped.
In the molding process, the micro-lens unit is processed and molded by the following processing method:
the method comprises the steps that a first micro lens is determined by a minimum round corner of a CNC (computer numerical control) process, the first lens has a first light-emitting effect, a second micro lens is simulated according to the first micro lens, so that the second micro lens has a second light-emitting effect, the second light-emitting effect is designed to be that a light spot formed by the first micro lens is complementary to a light spot formed by the second micro lens on an imaging surface, and the micro lens unit has a required light-emitting effect, wherein the minimum curvature radius of a lens curved surface of the second micro lens is at least larger than any curvature radius of the first micro lens.
The following will illustrate the technical solution of the microlens unit of the present invention with reference to specific examples.
Example 1
As shown in fig. 2, in the present embodiment, the microlens unit is implemented to be disposed in a one-dimensional plane. To form a rectangular spot, the microlens unit is substantially rectangular in shape.
The microlens unit of the present embodiment includes: a first microlens 1 and a second microlens 2.
The first microlenses 1 are distributed around the second microlenses 2, that is, the first microlenses 1 are continuously disposed around the second microlenses 2. The edge of the first microlens 1 is smoothly connected with the edge of the second microlens 2. Since the microlens unit of the present embodiment is substantially rectangular in shape, the first microlenses 1 located on the peripheral sides of the second microlenses 2 are correspondingly arranged in a rectangular ring-shaped configuration.
The first microlens 1 of the rectangular ring-shaped structure includes a plurality of arcuate curved surfaces, edges of adjacent arcuate curved surfaces are smoothly connected, curvature parameters of surfaces of the arcuate curved surfaces can be set to be the same or different according to a required light-emitting angle, and the same or different covers the situation that parts are the same or different.
As shown in fig. 3 to 5, specifically, a plurality of arcuate curved surfaces are provided in such a manner that the first microlens 1 includes: a first arched curved surface 11 arranged oppositely in the X direction, a second arched curved surface 12 arranged oppositely in the Y direction, and a third arched curved surface 13 smoothly connecting the first arched curved surface 11 and the second arched curved surface 12. The number of the third arched curved surfaces 13 is four, and every two of the four third arched curved surfaces 13 are arranged in the diagonal direction.
The second micro-lens 2 is located between the areas surrounded by the plurality of arched curved surfaces, and the outline shape of the second micro-lens is a rectangle internally connected with the first micro-lens 1. And the lens curved surface of the second microlens 2 is also an arch-shaped curved surface. The light-emitting angle of the arched curved surface is designed according to the light-emitting angle compensation of the lens curved surface of the first micro lens 1. In the molding mode, the lens curved surfaces of the first micro lens 1 and the second micro lens 2 can be processed and molded according to the required light-emitting angle through a CNC process. Therefore, the method ensures the machinability of the conventional CNC process, ensures the optical effect, greatly simplifies the machining schemes of other micro-lens arrays, and has lower cost and higher design freedom.
Example 2
In this embodiment, the microlens unit is arranged in a one-dimensional plane. In order to form a pentagonal spot, the shape of the microlens unit is substantially pentagonal.
The microlens unit of the present embodiment includes: a first microlens and a second microlens.
The first microlenses are distributed on the periphery of the second microlenses, that is, the first microlenses are continuously arranged around the second microlenses. The edge of the first microlens is smoothly connected with the edge of the second microlens. Since the shape of the microlens unit of the present embodiment is substantially pentagonal, the first microlenses located on the peripheral sides of the second microlenses are correspondingly arranged in a pentagonal ring structure.
The first micro-lens of the pentagonal annular structure comprises a plurality of arched curved surfaces, the edges of the adjacent arched curved surfaces are smoothly connected, the curvature parameters of the surfaces of the arched curved surfaces can be set to be the same or different according to the required light-emitting angle, and the same or different conditions cover the situation that parts are the same or different. Specifically, any side of the pentagonal annular structure is an arched curved surface, and the adjacent arched curved surfaces are smoothly connected through another arched curved surface.
The second micro lens is positioned among the areas surrounded by the plurality of arched curved surfaces, and the outline shape of the second micro lens is a pentagon inscribed in the first micro lens. And the lens curved surface of the second micro lens is also an arch curved surface. The light-emitting angle of the arched curved surface is designed according to the light-emitting angle compensation of the lens curved surface of the first micro lens. In the molding mode, the lens curved surfaces of the first micro lens and the second micro lens can be processed and molded according to the required light-emitting angle through a CNC process. Therefore, the method ensures the machinability of the conventional CNC process, ensures the optical effect, greatly simplifies the machining schemes of other micro-lens arrays, and has lower cost and higher design freedom.
Example 3
As shown in fig. 6, in the present embodiment, the microlens units are spatially arranged in planes of different dimensions. Specifically, the present invention is an embodiment in which a plurality of microlens units are distributed in different spatial dimensions. To form a rectangular spot, any microlens element is substantially rectangular in shape.
The microlens unit of the present embodiment includes: a first microlens 1 and a second microlens 2. The first microlenses 1 are distributed at local positions on the peripheral sides of the second microlenses 2, and the edges of the first microlenses 1 are smoothly connected with the edges of the second microlenses 2.
In one embodiment, the number of the microlens units of the present embodiment is two, and the two microlens units are stacked, and the stacked arrangement herein includes: a case where two microlens units are close to each other or a case where two microlens units have a space therebetween.
In any microlens unit, the lens curved surfaces of the first microlens 1 and the second microlens 2 are both cylindrical curved surfaces, and the light-emitting angle of the first microlens 1 and the light-emitting angle of the second microlens 2 are designed in a compensation mode. In this embodiment, the first microlenses 1 are convex cylindrical curved surfaces, and the second microlenses 2 are concave cylindrical curved surfaces.
Correspondingly, the size of the cylindrical surface of the first microlens 1 and the cylindrical surface of the second microlens 2 are set according to requirements, namely, the cylindrical surfaces are correspondingly set according to the required light-emitting angle in width and height. The first microlenses 1 are distributed on both sides of the second microlenses 2, and the two microlens units are orthogonally arranged, that is, the arrangement directions of the microlenses of the two combined microlenses are kept perpendicular.
In the molding mode, the lens curved surfaces of the first micro lens 1 and the second micro lens 2 can be processed and molded according to the required light-emitting angle through a CNC process. Therefore, the method ensures the machinability of the conventional CNC process, ensures the optical effect, greatly simplifies the machining schemes of other micro-lens arrays, and has lower cost and higher design freedom.
When the number of the microlens units is plural, the plural microlens units are arranged in an array form. According to different embodiments of the microlens unit, the technical solutions of the plurality of microlens units are exemplified below with reference to specific embodiments.
Example 4
As shown in fig. 7, in combination with the microlens unit in the above-described embodiment 1, a plurality of microlens units 10 are arranged in an array, and adjacent microlens units 10 are smoothly connected. The first microlenses of the rectangular shape are the common curved surfaces of the adjacent microlens units.
Example 5
In combination with the microlens unit in embodiment 2, a plurality of microlens units are arranged in an array, and adjacent microlens units are smoothly connected. The first microlens of the pentagon is a common curved surface of the adjacent microlens units.
Example 6
As shown in fig. 8, in combination with the microlens unit in the above-described embodiment 3, two microlens units are disposed in a laminated fit. In any layer, a plurality of microlens units 10 are arranged side by side, and adjacent microlens units 10 are smoothly connected. That is, any one of the first microlenses is smoothly connected to the second microlenses on both sides thereof.
Based on the light-transmitting cover plate, the invention also provides an optical device which uses the light homogenizing device to realize uniform light emitting of illumination so as to meet the actual illumination requirement. The optical device may take various forms depending on actual products, and for example, the optical device may be a laser ranging apparatus. The laser ranging device may specifically be a tof camera.
In one embodiment, the laser ranging apparatus comprises: the light source, the light-transmitting cover plate that is located on the light source light path. The light source can be a laser module. This laser module specifically includes: and (5) laser bare chip. At the moment, the laser bare chip realizes uniform light emission through the light-transmitting cover plate.
In summary, the light-transmitting cover plate of the present invention has the first microlens and the second microlens, which are optically complementary to each other, so as to achieve uniform emission of the light beam. Meanwhile, the purpose of light uniformization can be realized under the conditions of large-scale incident angles and different light intensities according to the characteristics of different light sources, and the actual use requirements are fully met.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A light-transmissive cover sheet, the cover sheet comprising: the light homogenizing structure is integrally formed on the cover plate body;
the light homogenizing structure is composed of a plurality of at least one micro lens unit, and the micro lens unit comprises: a first microlens and a second microlens;
the lens curved surface of the first micro lens is determined by a CNC process fillet, the first micro lens has a first light-emitting effect, the minimum curvature radius of the lens curved surface of the second micro lens is at least larger than any curvature radius of the lens curved surface of the first micro lens, the second micro lens has a second light-emitting effect, and the second light-emitting effect is designed to be complementary to a light spot formed by the first micro lens and a light spot formed by the second micro lens in an imaging surface, so that the light-transmitting cover plate has a required light-emitting effect.
2. The light-transmissive cover plate of claim 1, wherein the first microlenses are distributed around the second microlenses.
3. The light-transmitting cover sheet according to claim 2, wherein the first microlenses are polygonal, and the first microlenses comprise a plurality of arcuate curved surfaces, and edges of adjacent arcuate curved surfaces are smoothly connected.
4. The light-transmissive cover sheet of claim 3, wherein the first microlenses comprise: the device comprises a first arched curved surface arranged oppositely in the X direction, a second arched curved surface arranged oppositely in the Y direction and a third arched curved surface smoothly connecting the first arched curved surface and the second arched curved surface.
5. The cover plate of claim 1, wherein the first microlenses are distributed at a local position on the peripheral side of the second microlenses.
6. The light-transmitting cover sheet according to claim 1, wherein the processing method comprises the steps of: the method comprises the steps that a first micro lens is determined by a minimum round corner of a CNC (computerized numerical control) process, the first lens has a first light-emitting effect, a second micro lens is simulated according to the first micro lens, so that the second micro lens has a second light-emitting effect, the second light-emitting effect is designed to be that a light spot formed by the first micro lens is complementary to a light spot formed by the second micro lens on an imaging surface, and the light-transmitting cover plate has a required light-emitting effect, wherein the minimum curvature radius of a lens curved surface of the second micro lens is at least larger than any curvature radius of the first micro lens.
7. The cover plate of claim 1, wherein when the microlens unit is plural, the plural microlens units are arranged on the cover plate body in an array.
8. The light-transmitting cover plate of claim 1, wherein the cover plate body and the light-homogenizing structure thereon are integrally formed of the same material.
9. The light transmitting cover sheet of claim 1 wherein the cover sheet body is further provided with mounting structures adapted for assembly of the light transmitting cover sheet.
10. An optical device, comprising: the light source, the light-transmitting cover plate of any one of claims 1-9 on the light source light path.
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| CN202010144509.9A CN111338008A (en) | 2020-03-04 | 2020-03-04 | Light-transmitting cover plate and optical device |
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| CN202010144509.9A CN111338008A (en) | 2020-03-04 | 2020-03-04 | Light-transmitting cover plate and optical device |
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Application publication date: 20200626 |