Design method of large-size optical invisible irregular metal grid

Abstract

The invention relates to the technical field of metal grids, in particular to a large-size optical invisible irregular metal grid design method which comprises the following steps: S1, fine grid parameter design; s2, efficient splicing of irregular grids is carried out; s3, visual weakening processing is conducted on the splicing position; and S4, carrying out line anti-reflection treatment. When the metal grids are spliced, tens of millions of objects are contained in the large-size irregular grids, each small-size pattern serves as an independent unit, the line segments which are well designed are combined into blocks, the number of the processed objects is effectively reduced, the design efficiency is improved, the flexibility and the consistency of the patterns are guaranteed through the design, and the design efficiency is improved. The small-size patterns can be completely identical copies and can also be variants generated under the same logic and constraint conditions, the balance of diversity and uniformity of the whole patterns is guaranteed, visual weakening processing is carried out on the splicing positions, and the light transmittance of the splicing positions is equal to the light transmittance in the plane by reducing the line width and improving the light transmittance of the splicing positions.

Description

Technical Field

[0001] The invention relates to the technical field of metal grids, and in particular to a design method for a large-size optically invisible irregular metal grid. Background Art

[0002] In the field of optics, optical transparency and visual invisibility are two concepts that are often confused. Even if the light transmittance of a metal mesh is as high as 80% or more, its microstructure may still be detected due to the resolution limit of the human eye. This feature limits the application of traditional metal meshes in the pursuit of complete invisibility, and when the metal mesh is spliced, the visual effect of the splicing is poor, so this needs to be improved. Summary of the invention

[0003] The purpose of the present invention is to provide a design method for a large-size optically invisible irregular metal grid to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a design method for a large-size optically invisible irregular metal grid, comprising the following steps:

[0005] S1: Fine mesh parameter design, which precisely controls the width of the metal mesh to 5 microns or less, and ensures that the mesh number reaches or exceeds 240 meshes. Under this parameter, the density of the metal mesh holes is significantly improved, exceeding the recognition limit of the human eye, making the mesh almost invisible visually.

[0006] S2: Efficient splicing of irregular grids. Through modular metal grids, multiple single independent small-sized units are set in the large-sized metal grid plate. When splicing, a modular splicing strategy is adopted to connect the small-sized units on the butt edges of two large-sized metal grid plates.

[0007] S3: Visual weakening treatment at the joint. The grid pattern is denser on both sides of the joint, and the final product will have a visual color difference with other areas. To avoid this phenomenon, the line width is reduced and the transmittance of the joint is increased, so that the transmittance of the area is equal to the in-plane transmittance.

[0008] S4: Line anti-reflection treatment, by blackening the line surface, by forming a uniform and dense black film on the surface of the metal grid line. This film can significantly reduce the metal's reflection of light, thereby reducing the visual presence of the metal grid.

[0009] Preferably, the aperture ratio needs to be increased in S1, and the aperture ratio of the metal grid is maximized by accurately calculating the circuit area ratio. Strict restrictions on the circuit width help improve the light transmittance of the grid, so that the metal grid circuit achieves an invisible effect.

[0010] Preferably, the calculation formula for the aperture ratio is: the aperture ratio of the metal grid = 1 - the proportion of the line area = the proportion of the pore area.

[0011] Preferably, in S2, the pattern side length of each independent small-sized unit is about 50 mm. The small-sized patterns can be exactly the same replications or variants generated under the same logic and constraints, ensuring the balance between the diversity and unity of the overall pattern.

[0012] Preferably, in S3, the line width at the splicing position needs to be adjusted. At the splicing position, the line width is adjusted to 50%-75% of that in other areas to reduce the visual concentration effect caused by splicing.

[0013] Preferably, in S3, the splicing area needs to be defined. The width of the splicing area is set to 1-2 times the size of the hole, so that the light transmission effect in the splicing area is consistent with that in the overall plane, avoiding the color difference phenomenon and further enhancing the invisibility effect.

[0014] Preferably, in S2, the butt joint fixing method of the two large-sized metal grid plates is welding fixation.

[0015] Preferably, the steps of the welding fixation are as follows:

[0016] S2-1: Set the welding shape, area according to the welding requirements, and determine the laser welding route. There is at least one laser welding point in each butted independent unit, and the length of each welding point is not less than half of the contact side length of the butted independent unit, thus ensuring the stability of the welded connection;

[0017] S2-2: Butt joint the metal grids to be welded, and the independent units to be welded together are closely adjacent to each other;

[0018] S2-3: Set the laser parameters, including the pulse width, frequency and scanning speed, so that the laser irradiates and scans on the metal thin film with a high melting point according to the welding route. Among them, a laser with a short pulse width and high frequency is used, and the obtained laser peak energy magnitude enables the line to be instantaneously heated and melted without being punctured. The melted parts of the metal grid lines in the independent units on both sides form a molten pool, thus completing the welding;

[0019] S2-4: After welding the metal grids, coat a layer of high-performance structural glue (transparent materials such as epoxy resin can be used) on the welding area. The structural glue increases the connection stability of the metal grids on both sides and fills the gaps at the welding position;

[0020] S2-5: After the structural glue hardens, polish the welding position to make the connection between the two metal grids smooth and flat.

[0021] Preferably, in S4, the blackening treatment is to oxidize the metal circuit so that a black oxide film is formed on its surface, which can also improve the corrosion resistance and aesthetics of the circuit;

[0022] The specific steps of the blackening treatment are as follows:

[0023] S4-1: Preparation stage. First, clean the metal grid plate. Thoroughly clean the metal circuit with deionized water, diluted alkali solution or special cleaning agent to remove oil, dust and oxides; then degrease, use degreaser to remove the grease on the surface; then perform pickling, use pickling solution to remove impurities such as oxides on the surface;

[0024] S4-2: Blackening treatment. Through chemical oxidation, immerse the metal grid plate in a chemical solution containing oxidant, and control the immersion time and temperature to form a uniform black oxide film;

[0025] S4-3: Post-treatment. Take out the oxidized circuit from the solution and thoroughly clean it with deionized water to remove the residual chemical substances on the surface; then perform sealing treatment, immerse the oxidized circuit in the sealer to seal the pores of the oxide film and improve the corrosion resistance; or adopt the method of baking to form a dense protective layer on the surface of the oxide film at a certain temperature;

[0026] S4-4: Drying and inspection. Dry the treated metal grid plate, which can be air-dried or hot-air dried, and check whether the surface of the blackened circuit is uniform, whether the oxide film is firm, and whether there are defects.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] A design method of a large-size optical stealth irregular metal grid proposed by the present invention. When splicing the metal grid, there are tens of millions of objects in the large-size irregular grid. Each small-size pattern is used as an independent unit and is combined into "blocks" through carefully designed line segments, effectively reducing the number of processing objects, reducing the computational complexity, and improving the design efficiency. This design ensures the flexibility and consistency of the pattern. The small-size patterns can be exactly the same copies or variants generated under the same logic and constraint conditions, ensuring the balance between the diversity and unity of the overall pattern. And visually weaken the splicing part. By reducing the line width, the light transmittance of the splicing part is increased to make its area equal to the in-plane light transmittance. Then, blacken the whole grid, which can significantly reduce the reflection of metal on light, thereby reducing the visual presence of the metal grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the splicing part of the metal grid plate of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figure 1 , the present invention provides a technical solution: a design method for a large-size optical invisible irregular metal grid, including the following steps:

[0032] S1: Fine grid parameter design, precisely control the width of the metal grid within 5 microns or less, and at the same time ensure that the mesh number reaches or exceeds 240 meshes, so that the density of the grid holes of the metal grid is significantly improved under this parameter, exceeding the recognition limit of the human eye, making the grid almost invisible visually;

[0033] S2: Efficient splicing of irregular grids. By modularizing the metal grid, multiple single and independent small-size units are set in the large-size metal grid plate. Since there are tens of millions of objects in the large-size irregular grid, the requirements for the processor are relatively high and the time consumption is long during the pattern formation process. When splicing, a modular splicing strategy is adopted. Each small-size pattern is used as an independent unit and combined into a "block" through carefully designed line segments, effectively reducing the number of processing objects, reducing the computational complexity, and improving the design efficiency. The small-size units on the docking edges of two large-size metal grid plates are docked;

[0034] S3: Visual weakening treatment at the splicing part. On both sides of the splicing part, the grid pattern is relatively dense, and the final product will form a color difference with other areas visually. To avoid this phenomenon, by reducing the line width and increasing the light transmittance at the splicing part, making its area equal to the in-plane light transmittance;

[0035] S4: Anti-reflection treatment of the circuit. By performing blackening treatment on the surface of the circuit, a uniform and dense black film is formed on the surface of the metal grid circuit. This film can significantly reduce the reflection of light by the metal, thereby reducing the visual presence of the metal grid.

[0036] In the above S1, it is necessary to increase the aperture ratio. By accurately calculating the proportion of the circuit area, ensure that the aperture ratio of the metal grid is maximized (that is, the proportion of the pore area increases). The strict limitation of the line width (the width of the line is not greater than 5 microns) helps to improve the light transmittance of the grid, enabling the metal grid circuit to achieve an invisible effect.

[0037] The formula for calculating the aperture ratio is: the aperture ratio of the metal grid = 1 - the proportion of the circuit area = the proportion of the pore area.

[0038] In S2, the side length of the pattern of each independent small-sized unit is about 50 mm. The small-sized patterns can be exactly the same copies or variants generated under the same logic and constraints, ensuring the balance between the diversity and unity of the overall pattern.

[0039] In S3, it is necessary to adjust the line width at the splicing position. At the splicing position, the line width is adjusted to 50%-75% of that in other areas to reduce the visual concentration effect caused by splicing.

[0040] In S3, it is necessary to define the splicing area. The width of the splicing area is set to 1-2 times the size of the hole, so that the light transmission effect in the splicing area is consistent with that in the overall plane, avoiding the color difference phenomenon and further enhancing the invisibility effect.

[0041] In S2, the butt joint fixing method of the two large-sized metal mesh plates is welding fixation.

[0042] The steps of the welding fixation are as follows:

[0043] S2-1: Set the welding shape, area according to the welding requirements, and determine the laser welding route. There is at least one laser welding point in each butt-jointed independent unit, and the length of each welding point is not less than half of the contact side length of the butt-jointed independent unit, so as to ensure the stability of the welded connection;

[0044] S2-2: Butt-joint the metal meshes to be welded, and make the independent units to be welded together close to each other;

[0045] S2-3: Set the laser parameters, including pulse width, frequency and scanning speed, so that the laser irradiates and scans on the metal thin film with a high melting point according to the welding route. Among them, short-pulse-width and high-frequency lasers are used, and the obtained laser peak energy is such that the line can be instantaneously heated and melted without being penetrated. The melted parts of the metal mesh lines in the two independent units on both sides form a molten pool, thus completing the welding. The pulse width and frequency of the laser can be: the pulse width of the corresponding laser is 2-20 ns, the frequency is 500-1000 KHz, and the scanning speed is 30-100 mm / s;

[0046] S2-4: After welding the metal meshes, coat a layer of high-performance structural glue (transparent materials such as epoxy resin can be used) on the welding area. The structural glue increases the connection stability of the metal meshes on both sides and fills the gap at the welding position;

[0047] S2-5: After the structural glue hardens, polish the welding position to make the connection between the two metal meshes smooth and flat.

[0048] The blackening treatment in S4 is to oxidize the metal circuit so that a black oxide film is formed on its surface, which can also improve the corrosion resistance and aesthetics of the circuit;

[0049] The specific steps during the blackening treatment are as follows:

[0050] S4-1: Preparation stage. First, clean the metal grid plate. Thoroughly clean the metal circuit using deionized water, diluted alkaline solution or special cleaning agent to remove oil, dust and oxides; then perform degreasing, using a degreasing agent to remove the surface grease; then perform pickling, using pickling solution (such as sulfuric acid, hydrochloric acid, etc.) to remove impurities such as surface oxides;

[0051] S4-2: Blackening treatment. Through chemical oxidation, immerse the metal grid plate in a chemical solution containing an oxidant, such as silver nitrate solution, hydrogen peroxide solution, etc., and control the soaking time and temperature to form a uniform black oxide film;

[0052] S4-3: Post-treatment. Take out the oxidized circuit from the solution and thoroughly clean it with deionized water to remove the residual chemical substances on the surface; then perform a sealing treatment (optional), immerse the oxidized circuit in a sealing agent, such as sodium silicate solution diluted with hot water, to seal the pores of the oxide film and improve the corrosion resistance; or adopt a baking method to form a dense protective layer on the surface of the oxide film at a certain temperature;

[0053] S4-4: Drying and inspection. Dry the treated metal grid plate, which can use air drying or hot air drying, and check whether the surface of the blackened circuit is uniform, whether the oxide film is firm, and whether there are defects.

[0054] When splicing the metal grid, there are tens of millions of objects in a large-sized irregular grid. Each small-sized pattern is used as an independent unit and is combined into a "block" through a carefully designed line segment, effectively reducing the number of processing objects, lowering the computational complexity, and improving the design efficiency. This design ensures the flexibility and consistency of the pattern. The small-sized patterns can be exactly the same replicas or variants generated under the same logic and constraint conditions, ensuring the balance between the diversity and unity of the overall pattern. And perform visual weakening treatment on the splicing part. By reducing the line width, the light transmittance at the splicing part is increased to make its area equal to the in-plane light transmittance. Then perform blackening treatment on the whole grid, which can significantly reduce the reflection of metal to light, thereby reducing the visual presence of the metal grid.

[0055] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A design method for a large-size optically invisible irregular metal grid, characterized by: The following steps are included: S1: Fine mesh parameter design, which precisely controls the width of the metal mesh to 5 microns or less, and ensures that the mesh number reaches or exceeds 240 meshes. Under this parameter, the density of the metal mesh holes is significantly improved, exceeding the recognition limit of the human eye, making the mesh almost invisible visually. S2: Efficient splicing of irregular grids. Through modular metal grids, multiple single independent small-sized units are set in the large-sized metal grid plate. When splicing, a modular splicing strategy is adopted to connect the small-sized units on the butt edges of two large-sized metal grid plates. S3: Visual weakening treatment at the joint. The grid pattern is denser on both sides of the joint, and the final product will have a visual color difference with other areas. To avoid this phenomenon, the line width is reduced and the transmittance of the joint is increased, so that the transmittance of the area is equal to the in-plane transmittance. S4: Line anti-reflection treatment, by blackening the line surface, by forming a uniform and dense black film on the surface of the metal grid line. This film can significantly reduce the metal's reflection of light, thereby reducing the visual presence of the metal grid.

2. The design method of a large-size optical invisible random metal grid according to claim 1, characterized in that: In S1, the aperture ratio needs to be increased. By accurately calculating the circuit area ratio, the aperture ratio of the metal grid can be maximized. Strict restrictions on the circuit width help improve the light transmittance of the grid, making the metal grid circuit invisible.

3. The design method of a large-size optical invisible random metal grid according to claim 2, characterized in that: The calculation formula for the opening ratio is: opening ratio of the metal grid = 1 - circuit area ratio = pore area ratio.

4. The design method of a large-size optical invisible random metal grid according to claim 1, characterized in that: The pattern side length of each independent small-sized unit in S2 is about 50 mm. The small-sized pattern can be an identical copy or a variant generated under the same logic and constraints, ensuring a balance between the diversity and unity of the overall pattern.

5. The design method of a large-size optical invisible random metal grid according to claim 1, characterized in that: In the S3, the line width at the splicing location needs to be adjusted. At the splicing location, the line width is adjusted to 50%-75% of other areas to reduce the visual concentration effect caused by the splicing.

6. The design method of a large-size optical invisible random metal grid according to claim 1, characterized in that: In the S3, the splicing area needs to be limited, and the width of the splicing area is set to 1-2 times the size of the hole, so that the light transmission effect of the splicing area is consistent with that of the overall surface, avoiding color difference and further improving the invisible effect.

7. The design method of a large-size optical invisible random metal grid according to claim 1, characterized in that: The two large-sized metal mesh plates in S2 are fixed by welding.

8. The design method of a large-size optical invisible random metal grid according to claim 7, characterized in that: The steps of welding and fixing are: S2-1: Set the welding shape and area according to the welding requirements, and determine the laser welding route. Each connected independent unit has at least one laser welding point, and the length of each welding point is not less than half the length of the contact edge of the connected independent unit, so as to ensure the stability of the welding connection; S2-2: The metal grids to be welded are connected relative to each other, and the independent units to be welded are close together; S2-3: Setting laser parameters, including pulse width, frequency and scanning speed, so that the laser irradiates and scans the metal film with a high melting point along the welding route, wherein a short pulse width and high frequency laser is used, and the laser peak energy obtained at the same time enables the circuit to be instantly heated and melted without being broken down, and the metal grid circuits in the independent units on both sides are partially melted to form a molten pool, thereby completing the welding; S2-4: After welding the metal mesh, apply a layer of high-performance structural glue on the welding area. The structural glue increases the connection stability of the metal meshes on both sides and fills the gap at the welding point; S2-5: After the structural glue hardens, grind the weld to make the connection between the two metal meshes smooth and flat.

9. The design method of a large-size optical invisible random metal grid according to claim 1, characterized in that: The blackening treatment in S4 is to oxidize the metal circuit to form a black oxide film on its surface, which can also improve the corrosion resistance and aesthetics of the circuit; The specific steps of blackening treatment are: S4-1: In the preparation stage, the metal grid plate is first cleaned. Use deionized water, diluted alkali solution or special cleaning agent to thoroughly clean the metal circuit to remove oil, dust and oxides; then degrease and use degreasing agent to remove grease on the surface; then pickle and use pickling liquid to remove oxides and other impurities on the surface; S4-2: Blackening treatment, through chemical oxidation, immersing the metal mesh plate in a chemical solution containing an oxidant, controlling the immersion time and temperature to form a uniform black oxide film; S4-3: Post-treatment: remove the oxidized circuit from the solution and thoroughly wash it with deionized water to remove residual chemicals on the surface; then perform sealing treatment: immerse the oxidized circuit in a sealant to seal the pores of the oxide film and improve corrosion resistance; or use a baking method to form a dense protective layer on the surface of the oxide film at a certain temperature; S4-4: Drying inspection: Dry the treated metal grid plate. Air drying or hot air drying can be used. Check whether the surface of the blackened circuit is uniform, whether the oxide film is firm, and whether there are any defects.

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