CN117858483A - Spherical cover type electromagnetic shielding optical window based on spiral line arrangement circular ring net grating - Google Patents
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Abstract
A spherical cover type electromagnetic shielding optical window based on spiral line arrangement ring net grating belongs to the field of optical transparent electromagnetic shielding. Aiming at the current situation that the current spherical substrate has uneven distribution of metal grid unit structures and causes wave leakage and imaging quality degradation, the invention provides a grid structure which is formed by spirally arranging circular rings serving as basic units on a spherical surface. The ring unit can homogenize high-order diffraction, realize low side lobe optical diffraction characteristic, and the distribution form with the spiral line as the guide can make the ring net grating have better position uniformity on the sphere. The spherical cover type electromagnetic shielding light window based on the spiral line arrangement circular ring net grating provided by the invention can enable electromagnetic shielding characteristics and optical transparency at different positions of the spherical cover type light window surface to be more uniform and stable.
Description
Technical Field
The invention belongs to the field of optical transparent electromagnetic shielding, and particularly relates to a spherical cover type electromagnetic shielding light window based on spiral line arrangement circular ring net grids.
Background
The transparent electromagnetic shielding optical window has wide application in various instrument and meter, communication equipment and national defense equipment fields, such as optical windows of airplanes/satellites/ships/automobiles, optical windows and display panels of optical instruments, optical windows of electromagnetic isolation rooms and security facilities, transparent elements of communication equipment, mobile phone touch screens and the like. The transparent electromagnetic shielding optical window can have high light transmittance and high wave front quality, so that optical images and signal information can be accurately and efficiently transmitted, and meanwhile, the optical window can shield electromagnetic waves, and leakage of electromagnetic waves inside the optical window and interference of external electromagnetic waves inside the optical window are prevented. The research and application of the current transparent electromagnetic shielding optical window are mainly carried out on a plane optical window, and metal mesh grids with various structural forms are proposed and applied to the surface of the optical window, so that the metal mesh grids formed by connecting various complex structures are arranged as a main mode. Compared with the common plane transparent electromagnetic shielding optical window, the spherical optical window outline can obtain a larger field angle, and is more beneficial to improving the imaging range behind the optical window. The spherical cover type electromagnetic shielding optical window has very wide application prospect, and particularly has a plurality of equipment and facilities which are required for the range of the visual field and the imaging quality and work in environments such as high temperature and high pressure, high-speed fluid movement, multi-angle strong interference and the like. However, electromagnetic shielding of current spherical cap optically transparent components remains a technical difficulty, and related research and application cases are relatively few. In the prior researches, the metal grid form adopted on the spherical substrate is mainly divided into two types, wherein the first grid form takes manual design as a leading mode, and grid structures are directly distributed on the spherical outline, and are commonly grid structures with basic structures such as concentric circles, warp and weft lines, orthogonal double weft lines and the like; the second type of grid is usually a grid structure which is indirectly manufactured or randomly generated, for example, a grid which is processed by adopting a mode of 'self-assembled' crack grid with natural cracking of a film, stress stretching from a planar structure to a spherical structure and the like, and the generated grid pattern has certain randomness. In an actual application scene, the former type of grid structure generally lacks structural design aiming at spherical characteristics, and the grid distribution uniformity is poor, so that the larger the applied spherical sagittal ratio (the sagittal height of a spherical crown and the caliber ratio), the more obvious the grid density difference between the middle area of the spherical surface and the grid density of the edge area of the spherical surface is, and the uniformity and stability of the light transmission performance and the electromagnetic shielding performance are seriously influenced; the latter type of structure has larger randomness, the parameters are difficult to regulate and control, the uniformity of the mesh hole diameters is also difficult to ensure, and even though the structure density is reversely pushed by an algorithm, the thickness change of the mesh lines during manufacturing is difficult to control, so that the problems of broken wires, large local sheet resistance and the like are caused. The electromagnetic shielding is mainly realized in two modes of electromagnetic reflection and electromagnetic absorption, and through a reasonable and reliable spherical mesh grid structure, the electromagnetic shielding layer formed by the metal mesh grids on the surface of the spherical cover can realize the targets of electromagnetic reflection and electromagnetic absorption and can achieve better effect in the aspect of optical image information transmission.
At present, typical achievements and patents on spherical substrate grids are as follows:
patent publication No.: the CN1488997A 'a concave spherical photoetching and scribing machine' and 'deep concave spherical grid constant exposure laser direct writing control realization' and other patents and papers propose a design and manufacturing method of a spherical substrate grid, but the manufactured grid adopts structures such as 'weft lines or warp lines', and the like, and the uniformity of the aperture of the grid is difficult to ensure on a large sagittal ratio spherical substrate.
Patent publication No.: CN101917837a "an electromagnetic shielding conformal optical window with a longitude and latitude shaped grid structure", the grid structure adopts a concentric circle design, and the uniformity of the aperture of the spherical substrate grid is difficult to be ensured.
Patent publication No.: CN110931330a "a process for preparing honeycomb spherical grid", after the honeycomb grid is manufactured on a plane, pressing and attaching the honeycomb grid to a spherical surface by using a hydraulic press, wherein deformation and fracture of a line structure in the stretching and attaching process cannot be avoided, so that uniformity difference of the grid at different positions of the spherical surface is caused.
Patent publication No.: CN114051372a "a method for manufacturing a concave metal grid of a fairing", a grid of square grid type is carved on the concave spherical surface, and the uniformity difference of the holes of the grid of the spherical substrate is larger.
Patent application number: 201911335993.7 and 201510906030.3 patent publication nos.: CN106298401a "a tooling mold for forming a spherical grid and a method for forming a spherical grid", and patent publication No. CN218104063U "a tool for preparing a convex light-transmitting shielding window" are all the inventions that the wire grid is firstly attached to the spherical surface after being manufactured on a plane, and the problem that the density difference of the grid at different positions of the spherical surface can be caused due to deformation and fracture of a line structure in the stretching attaching process cannot be avoided.
Patent publication No.: CN104837326a "method for manufacturing electromagnetic shielding curved optical window with metal mesh structure", which adopts a method of drying mask liquid coating to generate cracks to form curved mesh, belongs to the "self-assembly" type, the cracks in this method are formed spontaneously by physical phenomenon, and the parameters such as period and line width of the mesh structure are difficult to control stably.
Patent publication No.: CN205828664U "a conformal spherical antenna array with good shielding effect" and patent publication No.: the main summary of CN205828676U "a conformal spherical antenna array" is to design the antenna array structure so that the antenna array can be provided with a shielding cover to prevent signal interference, but the shielding structure is not described, and the antenna shielding cover does not need to be optically transparent, so that it does not conflict with the disclosure of this patent.
In summary, the structure and manufacturing method of the spherical substrate grid of the present manual design type are mostly based on improvement of the planar grid to the spherical surface, completely depend on basic forms of latitude lines and concentric circles, lack design for three-dimensional spherical geometric features, and only connect the position nodes into the grid by using arcs. When the grid-like structure is observed from the top, but holes with high-density areas and structural deformities appear on the side along with the period, the requirements of the spherical substrate with a large sagittal ratio on the uniformity and consistency of the grid unit distribution are difficult to meet in the schemes; other mesh structures manufactured based on random and stretching schemes have the conditions of low random structure controllability and line breakage caused by stretching, and finally the uniform and stable light transmission performance and electromagnetic shielding performance of the spherical cover type light window are affected.
Disclosure of Invention
According to the spherical cover type electromagnetic shielding light window based on the spiral line arrangement circular ring net grids, the circular ring net grid units are arranged, the spherical metal net grids are obtained, the electromagnetic shielding performance and the optical performance stability of the spherical base net grids under multiple incidence angles are improved, and a high-quality transparent electromagnetic shielding net grid form is provided for the spherical cover type light window.
The technical scheme adopted by the invention is as follows: spherical cover type electromagnetic shielding optical window based on spiral line arrangement circular net grating: the electromagnetic shielding optical window structure consists of a transparent spherical cover substrate and a conductive circular net grid, wherein the conductive circular net grid is arranged on the convex spherical surface or the concave spherical surface of the transparent spherical cover substrate or both the convex spherical surface and the concave spherical surface; the conductive ring net grid is formed by spirally arranging ring units on the surface of a spherical surface, and at least one intersection point exists between each ring unit and a spiral line for indicating arrangement trend characteristics; the number of the spiral lines of the schematic arrangement trend features is more than or equal to 1, and the track of the spiral lines can be defined by a spiral line mathematical function expression of the spherical surface; the distance between the center of the circle of the circular ring unit and the nearest spiral line is smaller than or equal to the radius (R) of the outer circle of the circular ring; the ring units are intersected with at least one adjacent ring unit to form a ring net grid; the outer diameter (2*R) of the circular ring unit is smaller than 0.5 times of the wavelength of the shielded electromagnetic wave, and the inner diameter (2*r) is larger than the wavelength of the optical wave, so that the material for preparing the circular ring net grating has conductivity, and the spherical cover type optical window has a transparent electromagnetic shielding function.
The technical scheme of the invention comprises the following steps: types of helix on the sphere include: fibonacci, archimedes, ferma, equiangular, euler, logarithmic, and tetroduos.
The technical scheme of the invention comprises the following steps: the starting point of the spiral line can be located at any position of the complete spherical surface of the circular ring net grid, namely, the starting point of the spiral line can be located outside the spherical cover type electromagnetic shielding light window area.
The technical scheme of the invention comprises the following steps: the adjacent ring units on the sphere are N ring units with the nearest distance after the current ring unit and other ring units are ordered according to the spherical distance between the current ring unit and the other ring units, and the number of the N ring units which are intersected is generally 1-8, and the typical value is 4.
The technical scheme of the invention comprises the following steps: the diameter (2*R) of the outer circle of the ring unit is in millimeter and submillimeter magnitude, the line width of the ring unit, namely the difference (R-R) of the inner and outer circle radiuses of the ring is in micrometer or submillimeter magnitude, when the ring unit is intersected with the adjacent ring unit, the minimum width of the interconnected area is also in micrometer or submillimeter magnitude, and the thickness of the ring is larger than 100nm.
The technical scheme of the invention comprises the following steps: the spherical cover type circular ring net grid for shielding the optical window by the electromagnetic is made of metal, alloy, metal compound and graphene with good conductivity.
The technical scheme of the invention comprises the following steps: an antireflection film is arranged on the outer side of the conductive circular net gate.
The technical scheme of the invention comprises the following steps: and a protective film is arranged on the outer side of the conductive circular net gate.
The technical scheme of the invention comprises the following steps: an anti-reflection film is arranged on the outer side of the conductive circular net grid, and a protective film is arranged on the outer side of the anti-reflection film.
The innovation and good effect of the invention are:
1. compared with the common flat plate type optical window, the transparent spherical cover type optical window is based on the transparent spherical cover type optical window, and the optical system can obtain a larger imaging range under the condition of not using a wide angle and a fisheye lens, so that aberration such as distortion is reduced, and imaging quality of observation and photographic equipment after the optical window is improved.
2. The invention takes the ring unit as the most basic grid unit pattern, can homogenize the higher order diffraction distribution of the grid, realizes the optical diffraction characteristic of low sidelobes, and is beneficial to imaging; the mesh is formed by the spiral line arrangement ring units described by the mathematical expression, so that the mesh units can be uniformly distributed in all directions, the size of the light transmission aperture is uniform, the light window has relatively stable light transmission in the range of a visible angle, and the problems of vignetting, brightness, definition difference and the like caused by uneven mesh arrangement in different areas in the imaging or observing process are reduced.
3. On the basis of adopting the circular ring units, the invention promotes the homogenization of the mesh structure arranged on the basis of the spiral rule of space geometry, and has remarkable effect of improving the electromagnetic shielding performance of the spherical cover in different directions. When the traditional spherical grid structure scheme is applied to a large sagittal ratio spherical cover type optical window, the problem that the electromagnetic wave leakage of the position is aggravated and the whole electromagnetic shielding effect of the spherical cover type optical window is destroyed due to the fact that an aperture with an extreme size appears at the edge of the optical window is avoided.
In summary, the spherical substrate is used as the basis, the spiral line is used as a trend reference line to arrange the circular ring units, so that the spherical cover type electromagnetic shielding light window with the grid structure is formed and manufactured, and the electromagnetic shielding performance and the optical transparency performance have higher stability under multiple incidence angles.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional view of a spherical cover type electromagnetic shielding optical window based on a spiral line arrangement circular ring net grid.
Fig. 2 is an overall schematic diagram of a spherical cover type electromagnetic shielding optical window based on a spiral line arrangement circular ring net grid.
Fig. 3 is a schematic view of a spherical cover type electromagnetic shielding optical window based on a spiral line arrangement circular ring net grid.
Fig. 4 is a front view of a schematic diagram of the mesh structure of embodiment 1.
Fig. 5 is a schematic diagram of the mesh grid structure of example 1 from a top view.
Fig. 6 is a front view of a schematic diagram of the mesh structure of embodiment 2.
Fig. 7 is a schematic diagram of the mesh grid structure of example 2 from a top view.
Part number description in the drawings: 1. a transparent spherical substrate; 2. conductive ring net gate; 31. an antireflection film; 32. a protective film; 4. a spiral line; 5. grid on the complete sphere; 6. a truncated spherical grid; 7. a ring unit; 8. the circular rings are connected with each other; r, the radius of the outer circle of the circular ring unit; and r, radius of the inner circle of the circular ring unit.
Detailed Description
The invention is further described below with reference to the drawings and preferred embodiments: the purpose of the invention is realized in the following way: a point is arbitrarily selected as a starting point on the surface of a sphere with the same size as the surface of the target transparent spherical substrate (1), a spiral line (4) is arranged on the sphere, the spiral line (4) starts from the starting point on the whole sphere, winds the sphere, and reaches an end point symmetrical to the starting point about the center of the sphere; equally dividing the spiral line (4), wherein the end point of each small-section line is used as a position node; setting a circular ring on the tangential plane of the spherical surface through each position node, and projecting the circular ring on the spherical surface to obtain a structure, namely a circular ring unit (5) of the grid; the sizes of the circular ring units (5) are adjusted to enable adjacent circular rings to be intersected, and partial structures are mutually overlapped and connected to form a grid (2); the parameters of the circular ring can be finely adjusted by adopting a genetic algorithm and other modes, and the adjusted object is the circle center position and the radius of the circular ring, so that the overall uniformity of the grid is further improved; according to the size of the target spherical substrate (1), a region with proper size is cut from a designed spherical grid, the region is output as a grid design drawing, and a micro-nano processing technology is adopted, and metal, alloy and metal compound with good conductivity are used as materials to manufacture the spherical cover type optical window with transparent electromagnetic shielding performance on the transparent spherical substrate (1). In the practical use of the spherical cover type optical window, when visible light is incident on the grid on the spherical substrate, the wavelength of the light wave is smaller than the aperture of the grid unit, so that the light wave can smoothly pass through; when the electromagnetic wave to be shielded is incident on the grid of the spherical substrate, the wavelength of the electromagnetic wave is larger than the aperture of the grid unit, part of the electromagnetic wave is reflected, and part of the electromagnetic wave is converted into heat energy under the action of electromagnetic induction.
FIG. 1 is a schematic cross-sectional view of a spherical electromagnetic shielding optical window based on a spiral line arrangement circular grid, wherein the transparent spherical substrate (1) can be any transparent material as long as the transparent spherical substrate can be used as a transparent optical window material meeting the use requirement, and meanwhile, the circular grid (2) pattern can be processed on the surface of the transparent spherical substrate according to a certain process flow, and the transparent spherical substrate comprises common glass, quartz glass, infrared materials and transparent resin materials; the main part of the circular net grid (2) with electromagnetic shielding function is processed by high-conductivity materials, and can be processed on the convex spherical surface or the concave spherical surface of the spherical cover type optical window or simultaneously processed on the convex spherical surface and the concave spherical surface according to practical application requirements; the anti-reflection film (31) and the protective layer (32) are arranged according to the actual application requirement and cover the surface of the circular ring net grid (2), and can be formed by a single-layer or multi-layer film system structure, so that the effect of increasing the visible light transmittance is achieved, and meanwhile, the protective layer can prevent the metal part from being scratched or being exposed to the air for a long time to cause corrosion and oxidation.
Fig. 2 is an overall schematic diagram of a spherical cover type electromagnetic shielding optical window based on a circular ring net grid with spiral lines, wherein the design characteristics of the structure are explained from the perspective of top view, the spiral lines (4) are coiled on the whole spherical surface, the arrangement of circular ring units is controlled, and the distribution characteristics of two spiral lines are sketched in fig. 2 as a schematic diagram; the net grid (5) of the complete sphere is a spherical net grid obtained by arranging the circular ring units (7) into the complete sphere according to the spiral line (4) coiled into the complete sphere and the determined position nodes thereof; the spherical grid (6) is selected according to the caliber of the spherical cover type optical window and based on the complete spherical grid (5), and the grid of the part is manufactured on the transparent spherical substrate (1).
Fig. 3 is a schematic view of a spherical cover electromagnetic shielding optical window based on a spiral line arrangement circular ring net grid, the circular ring units (7) are basic units forming a net grid structure, the positions of the circular ring units are determined by equally-spaced spiral lines (4), the outer circle radius and the inner circle radius of each circular ring unit (7) are respectively R and R, mutually intersected overlapping areas (8) exist in adjacent circular ring units (7), the circular ring units (7) can be connected into a conductive grid, and therefore, the twice of the outer circle radius R of the circular ring units (7) is also larger than the minimum distance between the adjacent units.
For an understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings and described in the preferred embodiments.
Example 1:
according to an embodiment of the invention, as shown in fig. 4 and 5, a spherical cover type electromagnetic shielding optical window based on a spiral-arranged ring net grid in the embodiment adopts a fibonacci spiral function expression as shown in a formula (1),
where n is the number of total grid points of the complete sphere, k is the currently calculated grid point, R b The radius of the sphere is the irrational number of the rotation amplitude of the control spiral line, and the constant C has an influence on the number of the multiple spiral lines.
According to formula (1), the position node based on the spherical spiral line can be obtained after the corresponding parameters are brought in, and the center coordinates of the kth ring unit in the three-dimensional Cartesian coordinate system are (x) k ,y k ,z k ). The values of the parameters of the function in this case are: sphere radius R b =80 mm, number of full sphere mesh nodes n=160000 (for global presentation in the schematic drawing, the schematic drawing contains only 2000 mesh nodes), constantTaking each position node as a tangent plane of the spherical surface on the spherical surface, and setting a circular ring with an outer circle radius R=200 μm on the plane (the outer circle radius R=2.7 mm in the schematic diagram), wherein the width of the circular ring is 4 μm (the width of the circular ring in the schematic diagram is 100 μm); vertically projecting the circular ring to the spherical surface to obtain a circular ring grid on the spherical surface; further fine-tuning the position of the first ring of the grid unit, taking three rings adjacent to the first ring (namely the positions 2, 3 and 4 generated by the spiral line function), calculating the center of gravity, and moving the rings to the position so that the distance between the adjacent grid units is closer; and according to the caliber of the actual spherical cover type optical window, a structure with the consistent size is cut from the integral spherical grid to generate a design drawing, and the design drawing is used for manufacturing the spherical cover type optical window.
Example 2:
according to two embodiments of the present invention, as shown in fig. 6 and 7, in a spherical cover type electromagnetic shielding light window based on a circular ring net grid with spiral arrangement, the adopted three-dimensional spherical coordinate system spiral function expression is shown as formula (2),
where n is the number of total grid points of the complete sphere and k is the currently calculated grid point.
According to (2), after the corresponding parameters are brought in, the center coordinates of the kth ring unit in the three-dimensional spherical coordinate system areR b Is the radius of the sphere. The values of the parameters of the function in this case are: sphere radius R b =80 mm, number of full sphere mesh nodes n=160000 (for global illustration in schematic drawing, schematic drawing contains only 2000 mesh nodes); taking each position node as a tangent plane of the spherical surface on the spherical surface, and setting a circular ring with an outer circle radius R=200 μm on the plane (the outer circle radius R=2.7 mm in the schematic diagram), wherein the width of the circular ring is 6 μm (the width of the circular ring in the schematic diagram is 100 μm); vertically projecting the circular ring to the spherical surface to obtain a circular ring grid on the spherical surface; the position spacing of the grid units is further optimized and fine-tuned by using a genetic algorithm, so that the deviation of the distance between adjacent grid units is smaller; and according to the caliber of the actual spherical cover type optical window, a structure with the consistent size is cut from the integral spherical grid to generate a design drawing, and the design drawing is used for manufacturing the spherical cover type optical window.
The above description is only two specific examples of the present invention, and the spherical cover type electromagnetic shielding light window manufactured by the above cases can be used in the electromagnetic shielding requirement scene with X and Ku wave bands. It will be apparent to those skilled in the art that various modifications and changes in form and details may be made without departing from the principles and construction of the invention, but these modifications and changes based on the inventive concept are still within the scope of the appended claims.
Claims (9)
1. Ball cover type electromagnetic shielding optical window based on spiral line arrangement ring net grating, which is characterized in that: the electromagnetic shielding optical window structure consists of a transparent spherical cover substrate (1) and a conductive circular net grid (2), wherein the conductive circular net grid (2) is arranged on the convex spherical surface or the concave spherical surface of the transparent spherical cover substrate (1) or both the convex spherical surface and the concave spherical surface; the conductive ring net grid (2) is formed by spirally arranging ring units (7) on the surface of a spherical surface, and each ring unit (7) has at least one intersection point with a spiral line (4) for indicating arrangement trend characteristics; the number of the spiral lines (4) of the schematic arrangement trend characteristics is more than or equal to 1, and the track of the spiral lines (4) can be defined by a spiral line mathematical function expression of the spherical surface; the distance between the center of the circle of the circular ring unit (7) and the nearest spiral line is smaller than or equal to the radius (R) of the outer circle of the circular ring; the ring units (7) are intersected with at least one adjacent ring unit to form a ring net grid; the outer diameter (2*R) of the circular ring unit (7) is smaller than 0.5 times of the wavelength of the shielded electromagnetic wave, and the inner diameter (2*r) is larger than the wavelength of the light wave; the material for preparing the circular net grating has conductivity, so that the spherical cover type optical window has a transparent electromagnetic shielding function.
2. The spherical cover type electromagnetic shielding optical window based on the spiral line arrangement ring net grating as claimed in claim 1, wherein: the types of the spiral (4) on the sphere include: fibonacci, archimedes, ferma, equiangular, euler, logarithmic, and tetroduos.
3. The spherical cover type electromagnetic shielding optical window based on the spiral line arrangement ring net grating as claimed in claim 1, wherein: the starting point of the spiral line (4) can be positioned at any position of a complete spherical surface (5) provided with the circular ring net grid, namely, the starting point of the spiral line (4) can be positioned outside the spherical cover type electromagnetic shielding light window area (6).
4. The spherical cover type electromagnetic shielding optical window based on the spiral line arrangement ring net grating as claimed in claim 1, wherein: the adjacent ring units (7) on the sphere refer to N ring units (7) with the nearest distance after the current ring unit (7) and other ring units (7) are ordered according to the spherical distance between the current ring unit and each other, the number of the N ring units (7) which are generally intersected is 1-8, and the typical value is 4.
5. The spherical cover type electromagnetic shielding optical window based on the spiral line arrangement ring net grating as claimed in claim 1, wherein: the diameter (2*R) of the outer circle of the circular ring unit (7) is in the millimeter and sub-millimeter level, the line width of the circular ring unit (7), namely the difference (R-R) of the inner and outer circle radiuses of the circular ring, is in the micrometer or sub-micrometer level, the minimum width of the area (8) connected with each other is also in the micrometer or sub-micrometer level when the circular ring unit (7) is intersected with the adjacent circular ring unit, and the thickness of the circular ring is larger than 100nm.
6. The spherical cover type electromagnetic shielding optical window based on the spiral line arrangement ring net grating as claimed in claim 1, wherein: the spherical cover type circular ring net grid (2) for shielding the optical window is made of metal, alloy, metal compound and graphene with good conductivity.
7. The spherical cover type electromagnetic shielding optical window based on the spiral line arrangement ring net grating as claimed in claim 1, wherein: an antireflection film (31) is arranged on the outer side of the conductive circular net grid (2).
8. The spherical cover type electromagnetic shielding optical window based on the spiral line arrangement ring net grating as claimed in claim 1, wherein: a protective film (32) is arranged on the outer side of the conductive ring net gate (2).
9. The spherical cover type electromagnetic shielding optical window based on the spiral line arrangement ring net grating as claimed in claim 1, wherein: an antireflection film (31) is arranged outside the conductive ring net gate (2), and a protection film (32) is arranged outside the antireflection film (31).
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