High-precision microwave lapping optical shade and production method thereof

Abstract

The application discloses a high-precision microwave grinding optical shade and a production method thereof. A shade substrate is selected, the surface of the shade substrate is cleaned and pretreated, a predetermined diameter shape and a hole are formed on the shade substrate through cooperation of a precision die and a punching equipment, target grinding time and speed are set according to sample test results, and a suitable special composite material is selected to grind the surface of the punched shade to eliminate gloss. In the production method of the shade, the diaphragm hole is rapidly formed through punching, the surface gloss is removed through grinding and extinction, the optical characteristics of the shade are improved, the functional performance of the final product is improved, stable production of high-quality shades is realized through cooperation of multiple production links from material selection to completion of the final product, and the application is suitable for optical application fields with strict requirements and has excellent performance in product yield, production process optimization and market adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of light shielding sheet production, in particular to a high-precision microwave-polished optical light shielding sheet and a production method thereof. Background Art

[0002] As described in the published patent "An Anti-Glare Shading Sheet" with publication number CN216561327U, in recent years, smart electronic products such as mobile phones and tablet computers have become prevalent in modern people's lives, and the imaging devices installed on electronic products have also flourished. With the development of science and technology, users have higher and higher requirements for the quality of portable electronic devices. The current mainstream market for optical shading sheet materials is PET and PI sheets. The main advantages are easy molding and reduced reflectivity after surface carbon layer treatment compared to the original material. The disadvantages are high cross-section reflection after punching, obvious glare, poor temperature resistance, and easy deformation after ring testing. When used in smart electronic products, it cannot support the long-term use of imaging equipment and different temperature conditions. Hard and high-strength materials, such as metal materials, have the problem of high reflection. During use, it is easy to cause high reflectivity and cause stray light to be generated when the lens is actually shooting, affecting the imaging effect. For this reason, we propose an anti-glare shading sheet.

[0003] In summary, the existing light shielding sheet has a high reflectivity, which causes stray light in actual lens shooting. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for producing a high-precision microwave-polished optical light shielding sheet comprises the following steps:

[0007] S100: Punching: A light shielding sheet substrate is selected, and the surface of the light shielding sheet substrate is cleaned and pre-treated to form a smooth first working surface on the outer surface of the light shielding sheet substrate. The light shielding sheet substrate is punched to form an outline and holes of a predetermined diameter using a precision mold and a punching device;

[0008] S200: Grinding and matting: A small number of samples are selected for preliminary grinding tests using a high-precision grinder to test the matting effect under the preliminary grinding test. The target grinding time and speed are set based on the sample test results. A suitable special composite material is selected to grind the surface of the light shielding sheet after punching to eliminate gloss, so that the outer surface of the light shielding sheet substrate forms the second working surface of the microwave grinding;

[0009] S300: Ultrasonic cleaning: using ultrasonic cleaning equipment to clean the second working surface of the light shielding sheet after the grinding process;

[0010] S500: Drying: Drying the cleaned second working surface of the light shielding sheet;

[0011] S600: Dust and static removal, using physical methods to remove dust particles and static charges on the second working surface of the shading sheet.

[0012] As a further solution of the present invention: S100 includes the following steps:

[0013] S110: The light-shielding sheet substrate is selected as an optical light-shielding sheet with low reflectivity;

[0014] S120: Surface cleaning and pretreatment of the shielding film substrate includes observing and measuring the particle size on the surface of the shielding film substrate using an optical microscope equipped with image analysis software, removing dust and grease from the surface of the shielding film substrate using ultrasonic cleaning, and drying the shielding film substrate using a drying device to ensure that the particle density on the surface of the shielding film substrate is ≤5g / cm² and the size of individual particles on the surface of the shielding film substrate is ≤10μm;

[0015] S130: The shading sheet substrate is fixed on a precision mold, and the precision mold includes a clamping component with a circular periphery. The center of the clamping component is provided with an aperture punch with a diameter of ≤0.2mm. The punching equipment is used to perform periphery punching and center punching operations on the covering sheet substrate to prepare a semi-finished shading sheet.

[0016] As a further solution of the present invention: S200 includes the following steps:

[0017] S210: The specially prepared composite material used in the polishing step includes the following proportions by weight: modified epoxy resin accounts for 14% of the total amount, silicone rubber accounts for 6%, nano-diamond micropowder accounts for 18%, cubic boron nitride (cBN) micropowder accounts for 8%, ultrafine alumina (Al2O3) accounts for 12%, green silicon carbide micropowder (SiC) accounts for 3%, polyurethane elastomer microspheres account for 5%, zirconium oxide (ZrO2) accounts for 3%, carbon nanotubes or graphene accounts for 2%, molybdenum disulfide (MoS2) and hexagonal boron nitride (h-BN) account for 4%, self-healing microcapsules account for 2%, carbon black or metal oxides account for 4%, phosphate buffer accounts for 2%, polyacrylic polymer accounts for 1%, polyethylene wax accounts for 2%, ultraviolet absorber accounts for 1%, and antistatic agent accounts for 1%;

[0018] S220: Selecting a plurality of semi-finished shading sheet products and placing them in a plurality of high-precision grinders, wherein the high-precision grinders are equipped with the special composite material described in step S210, and the grinding times of the plurality of high-precision grinders are 10 minutes, 15 minutes, 20 minutes, 25 minutes, and 50 minutes, respectively; and the grinding speeds of the plurality of high-precision grinders are 300 rpm, 400 rpm, 500 rpm, 600 rpm, and 1000 rpm, respectively;

[0019] S230: Inspecting the semi-finished light shielding sheets processed by the multiple high-precision grinders in step S220 respectively. If the semi-finished light shielding sheet in a certain high-precision grinder meets the inspection requirements, the high-precision grinder is selected as the target grinder, and the operating parameters of the high-precision grinder are set as the target parameters.

[0020] If multiple semi-finished parts of the light shielding sheets processed by multiple high-precision grinders meet the inspection requirements, the operating parameters of the high-precision grinder with the shortest operating time are selected as the target parameters;

[0021] S260: placing the semi-finished light shielding sheet in a target grinding machine, and grinding the punched semi-finished light shielding sheet using target parameters to eliminate gloss, so as to obtain a finished light shielding sheet.

[0022] As a further solution of the present invention: S300 includes the following steps:

[0023] S310: Use ultrasonic cleaning equipment to clean the finished shading sheet, and the operating frequency of the ultrasonic cleaning equipment is between 80KHz and 130KHz.

[0024] As a further solution of the present invention: S500 includes the following steps:

[0025] S510: Preparation before drying: perform a preliminary inspection of all light shielding sheets before drying to ensure that there are no obvious contaminants or defects on the surface;

[0026] S520: Environmental preparation, setting up a dedicated oven, and ensuring the cleanliness inside the oven meets ISO Class 3 or above standards;

[0027] S530: Temperature control, setting the drying temperature in the oven to 50 degrees Celsius;

[0028] S540: Humidity monitoring, a high-precision humidity sensor is installed in the oven to ensure that the relative humidity does not exceed 5%RH;

[0029] S550: Airflow management, the oven is equipped with a controllable airflow system, and the air flow rate is controlled at 0.1-0.5m / s;

[0030] S560: Adopting the method of gradually increasing temperature, the shade is slowly transitioned from room temperature to the target temperature 50 degrees Celsius;

[0031] S570: The oven is provided with a temperature abnormality alarm mechanism, which triggers an alarm immediately once the temperature is detected to be out of the set range;

[0032] S580: Cooling and post-processing, after drying, the finished product of the shade in the oven is naturally cooled to near room temperature.

[0033] As a further scheme of the present application: the S600 includes the following steps:

[0034] S610: Initial air injection, using high-pressure compressed air filtered by HEPA, the surface of the shade is preliminarily sprayed and dusted to remove larger particles;

[0035] S620: Static elimination, using an ion air gun to neutralize the surface charge of the shade;

[0036] S630: Secondary air injection, using high-pressure compressed air for detailed spraying again to ensure no residual dust;

[0037] S640: Vacuum cleaning, for fine dust that is difficult to remove by air injection, a high-sensitivity vacuum cleaning device is used to suck away the remaining fine particles;

[0038] S650: Using a non-contact laser scanner or an optical microscope to perform the final detection on the surface of the shade.

[0039] A high-precision microwave grinding optical shade, the production of the microwave grinding optical shade adopts the production method described above.

[0040] Compared with the prior art, the present application has the following advantages:

[0041] The production method of the shade disclosed by the present application forms the diaphragm hole quickly by punching, removes the surface gloss by grinding and extinction, and improves the optical properties of the shade, which helps to improve the functional performance of the final product. Through the cooperation of multiple production links from material selection to the completion of the final product, stable production of high-quality and high-performance shades is realized, which is suitable for strict optical application fields, reduces the reflectivity of the shade, and avoids the problem of stray light in lens shooting. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a flow chart of steps S100-S600 in the present application;

[0043] Figure 2 is a flow chart of steps S110-S130 in the present application;

[0044] Figure 3 It is a flow chart of steps S2100-S260 in the present invention. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] See also Figure 1-3 A method for producing a high-precision microwave-polished optical shielding film comprises the following steps:

[0047] S100: Punching: A light shielding sheet substrate is selected, and the surface of the light shielding sheet substrate is cleaned and pre-treated to form a smooth first working surface on the outer surface of the light shielding sheet substrate. The light shielding sheet substrate is punched to form an outline and holes of a predetermined diameter using a precision mold and a punching device;

[0048] S200: Grinding and matting: A small number of samples are selected for preliminary grinding tests using a high-precision grinder to test the matting effect under the preliminary grinding test. The target grinding time and speed are set based on the sample test results. A suitable special composite material is selected to grind the surface of the light shielding sheet after punching to eliminate gloss, so that the outer surface of the light shielding sheet substrate forms the second working surface of the microwave grinding;

[0049] S300: Ultrasonic cleaning: using ultrasonic cleaning equipment to clean the second working surface of the light shielding sheet after the grinding process;

[0050] S500: Drying: Drying the cleaned second working surface of the light shielding sheet;

[0051] S600: Dust and static removal, using physical methods to remove dust particles and static charges on the second working surface of the shading sheet;

[0052] The use of precision molds and punching equipment for punching can ensure the dimensional accuracy of the shading sheet and the holes, and improve the consistency and quality stability of the product;

[0053] The grinding and matting step not only removes the surface gloss, but also may improve the optical properties of the mask, such as reducing reflections and increasing contrast, which helps to improve the visual effect or functional performance of the final product;

[0054] Ultrasonic cleaning can penetrate deep into the tiny pores of the light shield to remove residues, rather than just surface contaminants, thus ensuring a high degree of cleanliness of the light shield;

[0055] Ensure that the shade sheet is thoroughly and evenly dried to avoid quality problems such as deformation and mildew caused by residual moisture;

[0056] The dust removal step reduces dust particles on the finished product, which, for example, can cause malfunctions or reduce image quality in mobile phone cameras.

[0057] The static charge on the surface of the shading sheet easily attracts dust and other small particles. The static removal step can prevent this from happening, further improving the cleanliness of the product and reducing interference during subsequent processing or use;

[0058] Setting the grinding time and speed through sample testing, as well as selecting the appropriate special composite materials, can not only ensure product quality, but also improve production efficiency and reduce costs;

[0059] In summary, in the sunshade production method described in the present invention, the aperture hole is quickly formed by punching, the surface gloss is removed by grinding and matting, and the optical properties of the sunshade are improved at the same time, which helps to improve the functional performance of the final product. Through the cooperation of multiple production links, from the selection of materials to the completion of the final product, the stable production of high-quality and high-performance sunshades is achieved, which is suitable for use in optical applications with strict requirements, reduces the reflectivity of the sunshade, and avoids the problem of stray light in actual lens shooting.

[0060] In the embodiment of the present invention, the S100 includes the following steps:

[0061] S110: The light-shielding sheet substrate is selected as an optical light-shielding sheet with low reflectivity;

[0062] S120: Surface cleaning and pretreatment of the shielding film substrate includes observing and measuring the particle size on the surface of the shielding film substrate using an optical microscope equipped with image analysis software, removing dust and grease from the surface of the shielding film substrate using ultrasonic cleaning, and drying the shielding film substrate using a drying device to ensure that the particle density on the surface of the shielding film substrate is ≤5g / cm² and the size of individual particles on the surface of the shielding film substrate is ≤10μm;

[0063] S130: The light shielding sheet substrate is fixed on a precision mold. The precision mold includes a clamping assembly with a perfect circular periphery. The center of the clamping assembly is provided with an aperture punch with a diameter of ≤0.2 mm. The punching equipment is used to perform periphery punching and center punching operations on the cover sheet substrate to produce a semi-finished light shielding sheet.

[0064] Choosing optical-grade plastic with high light transmittance and low haze as the base material for the light shield ensures that the maximum amount of light is allowed to pass through when needed, and that light is not scattered due to irregularities inside or on the surface of the material, thereby ensuring clarity and accuracy of imaging.

[0065] Good mechanical strength means that the shading sheet can withstand the physical stress during installation and various external forces in the use environment, and is not easy to break or deform, thereby improving the durability and life of the product;

[0066] Observation and measurement using an optical microscope equipped with image analysis software ensures accurate detection of surface defects on the light shielding sheet substrate.

[0067] Ultrasonic cleaning can effectively remove tiny particles and grease from the substrate surface, while drying equipment ensures that the substrate is dry after cleaning. These measures help reduce defects, improve the optical performance of the mask, and make subsequent processing smoother.

[0068] Ensure that the particle density on the surface of the light shielding sheet substrate is ≤5g / cm² and the individual particle size is ≤10μm. This not only reduces foreign matter that may affect optical performance, but also reduces the risk of scratches or other damage in precision molds.

[0069] The use of a clamping assembly with a perfectly circular periphery and an aperture punch with a diameter of ≤0.2mm enables high-precision molding of the light shield. This design ensures the neatness and smoothness of the light shield edge, as well as the positional accuracy and shape consistency of the central aperture, which is crucial for applications requiring precise control of the optical path.

[0070] By using punching equipment to perform peripheral punching and center punching operations, the required semi-finished shading sheets can be obtained quickly and accurately, improving production efficiency while ensuring consistency in product quality.

[0071] In the embodiment of the present invention, the step S200 includes the following steps:

[0072] S210: The specially prepared composite material used in the polishing step includes the following proportions by weight: modified epoxy resin accounts for 14% of the total amount, silicone rubber accounts for 6%, nano-diamond micropowder (mixed with different particle sizes) accounts for 18%, cubic boron nitride (cBN) micropowder accounts for 8%, ultrafine alumina (Al2O3) accounts for 12%, green silicon carbide micropowder (SiC) accounts for 3%, polyurethane elastomer microspheres account for 5%, zirconium oxide (ZrO2) accounts for 3%, carbon nanotubes or graphene accounts for 2%, molybdenum disulfide (MoS2) and hexagonal boron nitride (h-BN) account for 4%, self-healing microcapsules account for 2%, carbon black or metal oxides account for 4%, phosphate buffer accounts for 2%, polyacrylic polymer accounts for 1%, polyethylene wax accounts for 2%, ultraviolet absorber accounts for 1%, and antistatic agent accounts for 1%;

[0073] S220: Selecting a plurality of semi-finished shading sheet products and placing them in a plurality of high-precision grinders, wherein the high-precision grinders are equipped with the special composite material described in step S210, and the grinding times of the plurality of high-precision grinders are 10 minutes, 15 minutes, 20 minutes, 25 minutes, and 50 minutes, respectively; and the grinding speeds of the plurality of high-precision grinders are 300 rpm, 400 rpm, 500 rpm, 600 rpm, and 1000 rpm, respectively;

[0074] S230: Inspecting the semi-finished light shielding sheets processed by the multiple high-precision grinders in step S220 respectively. If the semi-finished light shielding sheet in a certain high-precision grinder meets the inspection requirements, the high-precision grinder is selected as the target grinder, and the operating parameters of the high-precision grinder are set as the target parameters.

[0075] If multiple semi-finished parts of the light shielding sheets processed by multiple high-precision grinders meet the inspection requirements, the operating parameters of the high-precision grinder with the shortest operating time are selected as the target parameters;

[0076] S260: placing the semi-finished light shielding sheet in a target grinding machine, and grinding the punched semi-finished light shielding sheet using target parameters to eliminate gloss, thereby obtaining a finished light shielding sheet;

[0077] A carefully formulated, custom-made composite material containing multiple ingredients is used, with modified epoxy resin as a binder to provide good adhesion and chemical stability. Silicone rubber increases flexibility and impact resistance, helping to reduce stress generated during the grinding process. Nano-diamond powder (particle size 50nm, 100nm, 200nm) is used to meet different needs from coarse grinding to fine grinding without excessive damage to the plastic surface. Cubic boron nitride (cBN) powder (1-3μm) is suitable for applications with high hardness and wear resistance, but its dosage needs to be carefully controlled to prevent scratches. Ultrafine alumina (Al2O3) (average particle size <0.5μm) is suitable for grinding medium-hard materials and is friendly to plastics. Green silicon carbide powder (SiC) is only used in small quantities, mainly for quickly removing initial large defects. In addition, polyurethane elastomer microspheres are added to enhance the cushioning effect and reduce the pressure on the plastic surface; functional additives include zirconium oxide (ZrO2), carbon nanotubes or graphene to improve toughness and conductivity; molybdenum disulfide (MoS2) and hexagonal boron nitride (h-BN) are used as solid lubricants to reduce friction; self-healing microcapsules containing silicone oil or other lubricants extend tool life; carbon black or metal oxides such as Fe2O3 and TiO2 ensure the shading effect after grinding; phosphate buffer adjusts the pH value; polyacrylic polymers are used as dispersants to keep the abrasive particles evenly distributed. In order to better adapt to the plastic material, a small amount of polyethylene wax is added as an additional lubricant, as well as an appropriate amount of ultraviolet absorber to protect the plastic from damage by UV radiation, and finally an antistatic agent to prevent static adsorption of dust from affecting the processing quality.

[0078] After being ground under different conditions, semi-finished shading sheets are inspected to ensure that only products that meet the standards can proceed to the next step. The grinding machine with the shortest operating time and that meets the requirements is selected as the target machine. This not only improves production efficiency but also reduces energy consumption and equipment wear. Grinding the punched shading sheet semi-finished products using the selected optimal parameters can effectively eliminate gloss and achieve the desired optical performance, i.e., good shading effect.

[0079] By precisely controlling the composition of the specially formulated composite material and various parameters during the grinding process, we achieve refined management of the surface treatment of the shading sheet, which not only ensures the optical properties and mechanical strength of the product, but also improves production efficiency and resource utilization.

[0080] In the embodiment of the present invention, the S300 includes the following steps:

[0081] S310: using ultrasonic cleaning equipment to clean the finished shading sheet, the operating frequency of the ultrasonic cleaning equipment is between 80KHz and 130KHz;

[0082] Ultrasonic cleaning utilizes the cavitation effect, which is the phenomenon of rapid formation and collapse of microbubbles when ultrasonic waves propagate in a liquid. The collapse of these bubbles can generate a strong local impact force on the surface of the object, effectively removing particles, grease, and other contaminants attached to the surface. Compared to traditional cleaning methods, ultrasonic cleaning can more thoroughly clean hard-to-reach areas such as small gaps and recesses, ensuring that every corner of the finished piece of shade is fully cleaned. Operating in the high-frequency range of 80KHz to 130KHz, the ultrasonic cleaning process is relatively gentle, reducing the risk of physical damage to the surface of the finished piece of shade. This is because the cavitation effect at higher frequencies is less intense, but still strong enough to achieve efficient cleaning. The finished piece of shade after cleaning has higher cleanliness, which helps to ensure that its optical performance is not affected by surface stains, thereby improving the quality and reliability of the final product. Ultrasonic cleaning can effectively clean without the use of chemical cleaning agents, reducing the amount of chemicals used and the potential environmental pollution and health risks they may cause.

[0083] In the embodiments of the present application, the S500 comprises the following steps:

[0084] S510: Pre-drying preparation, preliminary inspection of all shades before drying to ensure that the surface is free of obvious contaminants or defects;

[0085] S520: Environmental preparation, set up a dedicated oven to ensure that the cleanliness in the oven meets the ISO Class 3 or above standard;

[0086] S530: Temperature control, set the drying temperature in the oven to 50 degrees Celsius;

[0087] S540: Humidity monitoring, high-precision humidity sensors are installed in the oven to ensure that the relative humidity does not exceed 5%RH;

[0088] S550: Airflow management, the oven is equipped with a controllable airflow system, and the air flow rate is controlled at 0.1-0.5m / s;

[0089] S560: Gradually increase the temperature to slowly transition the shade from room temperature to the target temperature of 50 degrees Celsius;

[0090] S570: Temperature anomaly alarm mechanism is set in the oven, which will trigger an alarm immediately once the temperature exceeds the set range;

[0091] S580: Cooling and post-processing, after drying is completed, the finished piece of shade in the oven is naturally cooled to near room temperature;

[0092] A preliminary inspection before drying can promptly detect and remove shading sheets with obvious contaminants or defects on the surface, avoiding unnecessary energy waste and time costs, while ensuring that the products entering subsequent processes have a high initial quality;

[0093] A dedicated drying oven with a cleanliness level of ISO Class 3 or above, along with strict management of humidity and airflow, provides an optimal drying environment for the shielding film. This helps prevent the introduction of new contamination during the drying process and ensures that the surface of the shielding film is not affected by moisture, maintaining its optical properties.

[0094] Determine the appropriate drying temperature of 50 degrees Celsius and relative humidity not exceeding 5% RH, which can effectively remove moisture without affecting the material properties and ensure the stability and consistency of the finished shade sheet;

[0095] Controlling the air velocity between 0.1-0.5m / s can promote uniform heat distribution, accelerate the evaporation process, and avoid the risk of the sunshade being displaced or damaged due to excessive airflow;

[0096] The gradual heating method is used to slowly transition the light shield to the target temperature, which can reduce the impact of thermal stress on the material and prevent deformation or other structural problems caused by rapid heating;

[0097] The temperature anomaly alarm mechanism can immediately issue an alarm when temperature fluctuations occur, allowing operators to take quick action to avoid possible batch losses and ensure the safety of the production process;

[0098] After drying, let the shade sheet cool naturally to near room temperature, which helps to reduce the internal stress caused by rapid cooling, ensure the stability of the physical properties of the shade sheet, and extend its service life;

[0099] Through a series of precise control measures, not only the quality and reliability of the shading sheets are improved, but also the production efficiency is optimized and the defective rate is reduced.

[0100] In the embodiment of the present invention, the S600 includes the following steps:

[0101] S610: Initial air spraying, using HEPA-filtered high-pressure compressed air to perform preliminary dust removal on the surface of the shading sheet to remove larger particles;

[0102] S620: Static electricity elimination, using an ion air gun to neutralize the surface charge of the shading sheet;

[0103] S630: Secondary air jetting, using high-pressure compressed air again for detailed spraying to ensure no residual dust;

[0104] S640: Vacuum cleaning, for fine dust that is difficult to remove with air jets, a highly sensitive vacuum cleaner is used to suck away the remaining fine particles;

[0105] S650: Use a non-contact laser scanner or optical microscope to perform final inspection on the surface of the light shield;

[0106] Using HEPA-filtered high-pressure compressed air for the initial air blast can effectively remove larger particulate contaminants on the surface of the shading sheet. HEPA filtration ensures the purity of the blast air itself and prevents secondary contamination. This step can quickly remove most visible dust and impurities, laying the foundation for subsequent more detailed treatment.

[0107] The ion air gun neutralizes the surface charge of the shading sheet, eliminating electrostatic attraction and reducing the possibility of dust re-adsorption. Static elimination helps improve the effectiveness of subsequent cleaning steps and ensures that fine dust will not re-attach to the surface due to static electricity.

[0108] Use high-pressure compressed air to spray carefully again to further clean any tiny particles that may have been missed or newly generated, ensuring that there is no residual dust on the surface of the shading sheet;

[0109] Repeated air jetting process enhances the thoroughness of cleaning, especially suitable for products with extremely high optical performance requirements;

[0110] For fine dust that is difficult to remove by air jets, highly sensitive vacuum cleaners are used to accurately absorb these remaining small particles, ensuring the ultimate cleanliness of the surface. The application of vacuum cleaners complements the shortcomings of air jets.

[0111] The final inspection of the mask surface using a non-contact laser scanner or optical microscope can accurately check and confirm whether the surface is completely dust-free and meets strict quality control standards;

[0112] Ensuring extreme cleanliness of the light shield surface can significantly improve product quality and reliability. Through multi-step cleaning and final inspection, the yield rate is increased and rework costs are reduced.

[0113] A high-precision microwave-polished optical shading sheet, the production of which adopts the above-mentioned production method,

[0114] The shading sheet manufactured using the above production method not only has excellent optical and mechanical properties, but also performs well in terms of product quality consistency, production process optimization, environmental protection and market adaptability.

[0115] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. A method for producing a high-precision microwave-polished optical light-shielding sheet, characterized in that: The steps include: S100: Punching: A light shielding sheet substrate is selected, and the surface of the light shielding sheet substrate is cleaned and pre-treated to form a smooth first working surface on the outer surface of the light shielding sheet substrate. The light shielding sheet substrate is punched to form an outline and holes of a predetermined diameter using a precision mold and a punching device; S200: Grinding and matting: A small number of samples are selected for preliminary grinding tests using a high-precision grinder to test the matting effect under the preliminary grinding test. The target grinding time and speed are set based on the sample test results. A suitable special composite material is selected to grind the surface of the light shielding sheet after punching to eliminate gloss, so that the outer surface of the light shielding sheet substrate forms the second working surface of the microwave grinding; S300: Ultrasonic cleaning: using ultrasonic cleaning equipment to clean the second working surface of the light shielding sheet after the grinding process; S500: Drying: Drying the cleaned second working surface of the light shielding sheet; S600: Dust and static removal, using physical methods to remove dust particles and static charges on the second working surface of the shading sheet.

2. The method for producing a high-precision microwave-polished optical shielding sheet according to claim 1, characterized in that: The S100 includes the following steps: S110: The light-shielding sheet substrate is selected as an optical light-shielding sheet with low reflectivity; S120: Surface cleaning and pretreatment of the shielding film substrate includes observing and measuring the particle size on the surface of the shielding film substrate using an optical microscope equipped with image analysis software, removing dust and grease from the surface of the shielding film substrate using ultrasonic cleaning, and drying the shielding film substrate using a drying device to ensure that the particle density on the surface of the shielding film substrate is ≤5g / cm² and the size of individual particles on the surface of the shielding film substrate is ≤10μm; S130: The shading sheet substrate is fixed on a precision mold, and the precision mold includes a clamping component with a circular periphery. The center of the clamping component is provided with an aperture punch with a diameter of ≤0.2mm. The punching equipment is used to perform periphery punching and center punching operations on the covering sheet substrate to prepare a semi-finished shading sheet.

3. The method for producing a high-precision microwave-polished optical light-shielding sheet according to claim 2, wherein: The S200 includes the following steps: S210: The specially prepared composite material used in the polishing step includes the following proportions by weight: modified epoxy resin accounts for 14% of the total amount, silicone rubber accounts for 6%, nano-diamond micropowder accounts for 18%, cubic boron nitride (cBN) micropowder accounts for 8%, ultrafine alumina (Al2O3) accounts for 12%, green silicon carbide micropowder (SiC) accounts for 3%, polyurethane elastomer microspheres account for 5%, zirconium oxide (ZrO2) accounts for 3%, carbon nanotubes or graphene accounts for 2%, molybdenum disulfide (MoS2) and hexagonal boron nitride (h-BN) account for 4%, self-healing microcapsules account for 2%, carbon black or metal oxides account for 4%, phosphate buffer accounts for 2%, polyacrylic polymer accounts for 1%, polyethylene wax accounts for 2%, ultraviolet absorber accounts for 1%, and antistatic agent accounts for 1%; S220: Selecting a plurality of semi-finished shading sheet products and placing them in a plurality of grinders, wherein the high-precision grinders are equipped with the special composite material described in step S210, and the grinding times of the plurality of high-precision grinders are 10 minutes, 15 minutes, 20 minutes, 25 minutes, and 50 minutes, respectively; and the grinding speeds of the plurality of high-precision grinders are 300 rpm, 400 rpm, 500 rpm, 600 rpm, and 1000 rpm, respectively; S230: Inspecting the semi-finished light shielding sheets processed by the multiple high-precision grinders in step S220 respectively. If the semi-finished light shielding sheet in a certain high-precision grinder meets the inspection requirements, the high-precision grinder is selected as the target grinder, and the operating parameters of the high-precision grinder are set as the target parameters. If multiple semi-finished parts of the light shielding sheets processed by multiple high-precision grinders meet the inspection requirements, the operating parameters of the high-precision grinder with the shortest operating time are selected as the target parameters; S260: placing the semi-finished light shielding sheet in a target grinding machine, and grinding the punched semi-finished light shielding sheet using target parameters to eliminate gloss, so as to obtain a finished light shielding sheet.

4. The method for producing a high-precision microwave-polished optical shielding sheet according to claim 3, wherein: The S300 includes the following steps: S310: Use ultrasonic cleaning equipment to clean the finished shading sheet, and the operating frequency of the ultrasonic cleaning equipment is between 80KHz and 130KHz.

5. The method for producing a high-precision microwave-polished optical light-shielding sheet according to any one of claims 1 to 4, characterized in that: The S500 includes the following steps: S510: Preparation before drying: perform a preliminary inspection of all light shielding sheets before drying to ensure that there are no obvious contaminants or defects on the surface; S520: Environmental preparation, setting up a dedicated oven, and ensuring the cleanliness inside the oven meets ISO Class 3 or above standards; S530: Temperature control, setting the drying temperature in the oven to 50 degrees Celsius; S540: Humidity monitoring, a high-precision humidity sensor is installed in the oven to ensure that the relative humidity does not exceed 5%RH; S550: Airflow management, the oven is equipped with a controllable airflow system, and the air flow rate is controlled at 0.1-0.5m / s; S560: Using a gradual temperature increase method, the shading sheet slowly transitions from room temperature to the target temperature of 50 degrees Celsius; S570: The oven is equipped with a temperature anomaly alarm mechanism. Once the temperature exceeds the set range, the alarm is immediately triggered. S580: Cooling and post-processing. After drying, the finished shading sheet in the oven is naturally cooled to near room temperature.

6. The method for producing a high-precision microwave-polished optical light-shielding sheet according to claim 5, characterized in that: The S600 includes the following steps: S610: Initial air spraying, using HEPA-filtered high-pressure compressed air to perform preliminary dust removal on the surface of the shading sheet to remove larger particles; S620: Static electricity elimination, using an ion air gun to neutralize the surface charge of the shading sheet; S630: Secondary air jetting, using high-pressure compressed air again for detailed spraying to ensure no residual dust; S640: Vacuum cleaning, for fine dust that is difficult to remove with air jets, a highly sensitive vacuum cleaner is used to suck away the remaining fine particles; S650: Use a non-contact laser scanner or optical microscope to perform final inspection of the shielding surface.

7. A high-precision microwave polished optical shading sheet, characterized in that: The microwave polishing optical shading sheet is produced by the production method according to any one of claims 1 to 6.

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