Front acid washing centrifugal uniform gel type slotting prism large plate batch shading and inking processing technology

Abstract

The application discloses a front-positioned acid washing centrifugal uniform-glue type slotted prism large plate batch light shielding and ink coating processing technology, which comprises the following steps: processing array-arranged light shielding grooves on the surface of an optical glass large plate base material and reserving a thickness allowance; using a hydrofluoric acid pickling solution to perform corrosion repair and roughening treatment on the inner wall of the light shielding grooves; performing multi-stage ultrasonic pure water cleaning and drying after pickling; pasting multiple workpieces on a flexible film of a bearing tool and matching the slot direction of the light shielding grooves with the centrifugal rotation direction of the bearing tool; quantitatively dropping liquid light shielding ink into each light shielding groove; placing the bearing tool on a rotary centrifugal device, driving the ink to uniformly spread along the groove wall through centrifugal force, and making the excess ink overflow to the surface of the workpiece; segmentally and gradiently heating and solidifying the ink; and grinding and polishing the whole workpiece after solidification by using the reserved thickness allowance, removing the surface overflowed ink and thinning to the standard size of the finished product. The application can reduce equipment and consumable investment and greatly improve the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of light-shielding ink coating technology, specifically to a batch light-shielding ink coating process for large plates of pre-acid washing, centrifugal uniform coating, and slotted prism. Background Technology

[0002] The slotted beam splitter prism in a periscope imaging module requires internal light-shielding slots to be filled with light-shielding ink to eliminate stray light and suppress imaging ghosting. Currently, both of the two mainstream ink coating solutions in the light-shielding ink coating industry have significant shortcomings: The first method is the traditional single / strip gluing + manual ink spreading solution. After the large board is grooved, it is first cut into strips and single prisms, and then gluing is applied to each one manually. The ink spread is achieved by manual scraping and wiping. Its processing efficiency is extremely low. The entire process of single-piece positioning, gluing, ink spreading, and removing excess ink is done manually, which limits the batch production capacity. The intensity of manual ink spreading is uncontrollable, and the ink thickness varies greatly in the groove, which can easily lead to light leakage and ink accumulation.

[0003] The second method is mass inking via screen printing. Currently, most mass inking of large boards uses screen printing, which has several cost and quality drawbacks: ① High equipment and consumable costs: Customized high-precision array screen printing stencils and specialized alignment tooling are required. Different slot widths and sizes necessitate separate stencil creation, leading to high stencil processing costs. Screens are consumables; after a period of use, they may become clogged or deformed, requiring regular replacement, resulting in long-term high consumable costs. ② Ink residue easily remains on the screen, making cleaning tedious. Small light-blocking slots are prone to clogging and ink shortages, resulting in a high rate of poor light-blocking performance. ③ Controlling the squeegee pressure and screen distance parameters is difficult. Thin, large boards are easily deformed under pressure, leading to severe ink overflow, requiring extensive manual wiping to remove the overflow.

[0004] The existing pre-treatment and post-treatment processes have inherent defects: ① The industry's conventional processes do not include a pre-treatment process of hydrofluoric acid (HF) pickling after grooving: After CNC machine tools / laser grooving, there are micro-cracks and processing scratches on the inner wall of the tank. When ink is applied directly, it cannot penetrate into the cracks, and after high and low temperature aging, the ink falls off and leaks light; moreover, the inner wall of the tank is smooth, resulting in poor ink adhesion; pickling is mostly set after ink coating and polishing, which corrodes the optical polished surface of the finished product, causing pitting and haze defects. ② Overflow ink treatment relies on manual wiping: Solvent + lint-free cloth is used to manually wipe away surface overflow ink, which has poor consistency, easily scratches the optical surface, leaves residual ink, and causes pinholes and film peeling in subsequent coating; there is no process route to use the reserved thickness margin of the large board for overall grinding to remove overflow ink. ③ The coating parameters lack standardized design of experiments (DOE) matching logic: Ink ratio and uniform coating speed are adjusted only by the operator's experience, and when the tank width and depth change, it is very easy to have ink shortage at the bottom of the tank and ink accumulation at the tank mouth.

[0005] In addition, the existing few centrifugal coating equipment are only for single-sided coating of a whole circular lens, and there is no solution for multiple square slotted prisms, ring arrangement, and centrifugal ink uniform coating in the groove; there is no structure with iron ring + UV film to flexibly support multiple workpieces, and it cannot be compatible with the batch processing of square and rectangular large plates / long strip prisms.

[0006] Therefore, to solve the above-mentioned defects, a new large-scale batch light-shielding ink coating process is urgently needed. This new large-scale batch light-shielding ink coating process needs to solve the following technical problems: ① It replaces high-cost screen printing solutions, eliminates screen printing stencils and special precision screen printing fixtures, and uses only low-cost UV protective film, reducing equipment and consumable investment.

[0007] ② This invention solves the problems of low efficiency in manual ink application for single workpieces, uneven ink spreading, light leakage, and poor ink accumulation, and enables simultaneous centrifugal ink application for multiple workpieces.

[0008] ③ An additional HF pickling process is added before the grooving to repair micro-cracks in the inner wall of the grooving tank, roughen the inner wall and improve ink adhesion, while avoiding corrosion of the finished product's polished optical surface after pickling.

[0009] ④ Utilize the reserved thickness margin of the large board to grind and polish the entire surface to remove excess ink, completely replacing manual wiping, improving product consistency and reducing labor costs.

[0010] ⑤ By matching the ink ratio, centrifugal speed of the turntable and the tank size through DOE orthogonal experiments, the ink filling state in the tank can be precisely controlled to prevent light leakage and ink accumulation defects.

[0011] ⑥ Provides a flexible support solution of annular iron ring + UV film, with square prisms arranged in a circular array, compatible with vacuum adsorption turntable / mechanical clamping turntable, allowing for simultaneous processing of multiple pieces and significantly improving mass production efficiency. Summary of the Invention

[0012] The purpose of this invention is to address the shortcomings of existing technologies by providing a batch light-shielding and ink-coating process for large-scale slotted prism plates with pre-acid washing, centrifugal homogenization, and coating.

[0013] The objective of this invention is achieved through the following technical solution: a batch processing technology for light-shielding and ink coating of large-format slotted prism plates using a pre-acid washing and centrifugal homogenizing method, comprising the following steps: S1. Large plate grooving: An array of light-shielding grooves is processed on the surface of the optical glass large plate substrate, and the large plate substrate is reserved with a thickness allowance. S2. Pre-pickling treatment: Immerse the large plate after slotting in the pickling solution to corrode and roughen the inner wall of the light-shielding tank. S3. Cleaning and drying: The pickled plates are subjected to multi-stage ultrasonic pure water cleaning and hot air drying. S4. Clamping and fixing: Cut the cleaned and dried large plate into multi-section long strip small plate workpieces that are suitable for the bearing fixture as needed. Paste multiple workpieces onto the flexible film of the bearing fixture and make the groove direction of the light-shielding groove match the centrifugal rotation direction of the bearing fixture. S5. Quantitative ink dispensing: Use a dispensing machine to dispense liquid light-shielding ink into each light-shielding groove in a quantitative manner; S6. Centrifugal ink spreading: The carrier is placed on a rotating centrifugal device, and the ink in the light-shielding tank is evenly spread along the tank wall by centrifugal force, and the excess ink overflows to the surface of the workpiece. S7. Ink curing: The spread ink is cured by segmented gradient heating. S8. Overall grinding and polishing to remove excess ink: Using the reserved thickness allowance, the entire cured workpiece is ground and polished to remove excess ink from the surface and reduce the thickness to the standard size of the finished product.

[0014] Furthermore, in step S2, the pickling solution is a hydrofluoric acid pickling solution with a mass concentration of 12%, the pickling temperature is controlled by a constant temperature of 16℃~20℃, and the pickling time is configured to remove microcracks and micro-chipping in the tank and form a micro-rough surface.

[0015] Furthermore, in step S4, the supporting fixture includes a circular iron ring carrier and a flexible film attached to the surface of the circular iron ring carrier, the flexible film being a UV protective film; multiple workpieces are evenly arranged along the circumference of the circular iron ring carrier, and the opening direction of the light-shielding groove is parallel to the radial or diametrical direction of the circular iron ring carrier.

[0016] Furthermore, in step S6, the rotating centrifuge device includes a turntable, and the supporting fixture is fixed on the turntable by vacuum adsorption or side mechanical clamping. The rotation speed of the turntable is 1000 r / min to 2000 r / min.

[0017] Furthermore, in step S7, the segmented gradient heating and curing includes a low-temperature pre-baking section and a high-temperature curing section. The temperature of the low-temperature pre-baking section is 75℃~85℃, and the holding time is 5 minutes. The temperature of the high-temperature curing section is 115℃~125℃, and the holding time is 60 minutes.

[0018] Furthermore, in step S8, the overall grinding and polishing involves simultaneously grinding the upper and lower surfaces of the workpiece, wherein the amount removed by grinding is equal to the reserved thickness allowance.

[0019] Furthermore, after step S8, the method further includes: Post-processing steps: The ground board is cut into multi-strip materials according to the design size. The beveled surface of the strip materials is precisely ground and polished. A screen-printed protective film is coated on the optically transparent surface and a beam-splitting film or anti-reflection film is vacuum-deposited. Finally, the single slotted prism is cut into finished products.

[0020] Compared with the prior art, the beneficial effects of the present invention are: (1) Significantly reduce equipment and consumable production costs and replace expensive screen printing solutions: This invention eliminates the need for customized screen printing stencils and high-precision alignment screen printing fixtures required for screen printing. Screens are high-frequency consumables and have high long-term replacement costs. This invention uses only low-cost disposable UV protective film as consumables, combined with a general-purpose small dispensing machine and a simple rotating turntable, which significantly reduces the overall cost of equipment procurement, maintenance and consumables.

[0021] (2) The production efficiency is significantly improved by synchronous centrifugation of multiple rings: The single set of iron rings of the present invention can simultaneously carry multiple slotted workpieces, and complete the uniform coating of ink in the slots of multiple products in one dispensing and one centrifugation. Compared with the traditional single manual dispensing and single screen printing, the mass production capacity of the present invention is increased several times, and there is no need to load and unload each piece for positioning, reducing the number of manual operation stations.

[0022] (3) Centrifugal force automatically spreads ink evenly and the light-blocking performance is stable: This invention relies on constant centrifugal force to drive the ink to spread evenly along the channel, and there are no problems such as screen printing clogging or uneven manual scraping force; with DOE verification to lock the ink ratio and speed parameters, the ink layer thickness in the tank can be stably controlled, eliminating the defects of ink shortage and light leakage at the bottom of the tank and ink accumulation at the mouth of the tank, and the product light defect rate is greatly reduced.

[0023] (4) Pre-treatment of the inner wall of the HF pickling tank significantly improves ink adhesion: The present invention performs HF pickling pretreatment after the tank is opened and before ink is applied, which can eliminate micro-cracks and scratches generated by CNC machine tools / laser processing, and at the same time roughen the inner wall of the tank to improve ink adhesion. The pickling process of the present invention is placed before the blank stage, which will not corrode the optically transparent surface of the subsequent polishing and forming, and can solve the pain point of traditional post-pickling damaging the product surface.

[0024] (5) Overall grinding replaces manual wiping to remove ink overflow, resulting in good quality consistency and low labor cost: This invention utilizes the reserved thickness margin of the board to grind the entire surface to remove ink overflow, completely eliminating the manual wiping process with a dust-free cloth, avoiding ink residue and optical surface scratches caused by manual operation; after grinding, the board surface is free of ink impurities, and the subsequent coating process is free of pinholes and poor film peeling, resulting in highly consistent processing quality of batch products.

[0025] (6) The equipment is highly versatile and can be adapted to multiple product specifications: This invention only requires adjusting the dispensing program and the centrifugal speed of the turntable to adapt to grooving prisms with different groove widths and depths; the iron ring carrier of this invention can be replaced with different diameter specifications, and is compatible with two substrate forms: large plates and long strips. One production line can meet the production of multiple product models.

[0026] (7) Closed-loop process to reduce product defects: The entire process of this invention is completed before the plate is granulated, including pickling, batch ink coating and overall ink removal, which reduces workpiece damage, scratches and dust pollution caused by multiple granulation and turnover, and significantly reduces the scrap rate of finished products. Attached Figure Description

[0027] Figure 1 This is a flowchart of the pre-acid washing, centrifugal uniform coating, slotted prism large plate batch light-shielding ink coating process of the present invention. Figure 2 This is a three-dimensional schematic diagram of the slotted large plate with reserved grinding allowance according to the present invention; Figure 3 This is a top view schematic diagram of multiple workpieces of the present invention being pasted on a UV protective film and uniformly arranged along the circumference of a circular iron ring carrier. Figure 4 This is a cross-sectional schematic diagram of the rotary centrifugal ink distribution process of the present invention. Detailed Implementation

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0029] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0030] It should be understood that although the terms first, second, third, etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of this invention, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0031] The present invention will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0032] See Figure 1 The pre-acid washing, centrifugal, uniform coating, slotted prism large plate batch light-shielding and ink coating process of the present invention specifically includes the following steps: S1. Large-plate grooving: An array of light-shielding grooves is processed on the surface of the optical glass large-plate substrate, and the large-plate substrate is reserved with a thickness allowance.

[0033] Specifically, a large quartz optical glass plate is selected as the substrate. Since the product requires single-sided grooving and ink coating, a certain thickness allowance needs to be reserved on the grooved surface; that is, a double-sided grinding allowance of 0.08~0.15mm is reserved for the overall thickness of the plate. Multiple sets of light-shielding grooves are processed in an array layout on the surface of the large plate using CNC milling equipment or laser grooving equipment. The grooving depth is greater than the designed groove depth of the finished product, reserving a correction allowance for subsequent acid pickling and etching. Figure 2 As shown. The large panels are not separated immediately after processing to maintain overall rigidity and facilitate subsequent batch transportation.

[0034] S2. Pre-pickling pretreatment (pre-core optimization process): Immerse the large plate after slotting in hydrofluoric acid (HF) pickling solution to corrode and roughen the inner wall of the light-shielding tank.

[0035] Specifically, the entire large plate after grooving is immersed in an acid pickling tank with a mass concentration of 12% HF pickling solution for constant temperature immersion treatment. The pickling temperature is 16℃~20℃, and the pickling time is configured to remove micro-cracks and micro-chipping in the tank and form a micro-rough surface, such as immersion treatment for 5 minutes. The pickling process serves multiple functions: First, HF etching removes micro-cracks, chipped edges, and tool scratches from the inner wall of the light-shielding groove generated during grooving, eliminating ink trapping in cracks and the potential for ink aging, peeling, and light leakage during subsequent use. Second, pickling uniformly roughens the microscopic surface of the inner wall of the light-shielding groove, increasing the mechanical and chemical bonding force between the light-shielding ink and the glass substrate, ensuring that the ink does not peel or flake after high and low temperature cycling. Simultaneously, pickling thoroughly removes residual glass fragments, cutting dust, and oil impurities from the light-shielding groove, ensuring a clean and contaminant-free environment. Finally, slight etching subtly adjusts individual differences in the dimensions (width and depth) of the inner wall of the light-shielding groove, standardizing the width and depth tolerances of batch products and reducing subsequent ink coating thickness variations, thus providing a prerequisite for consistent ink coating thickness. Because this pickling pretreatment process is performed after grooving and before ink coating and final polishing, it does not cause any damage to the optical surface of the finished product. The workpiece has not yet been polished and formed, so it will not corrode or damage the optically polished surface of the final product, thus avoiding the defect of damaging the light-transmitting surface after acid pickling.

[0036] It should be noted that when pickling large plates with HF, a perforated hanging fixture can be used to hang the large plates and immerse them in the pickling tank of HF pickling solution. This can ensure that the HF pickling solution completely wets the light-shielding tank, with no dead corners where liquid accumulates, and can pickle large plates in batches.

[0037] S3. Cleaning and drying: The pickled plates are subjected to multi-stage ultrasonic pure water cleaning and hot air drying.

[0038] Specifically, after pickling, the large boards are sequentially transferred to an overflow pure water cleaning tank for initial rinsing, then sent to a high-frequency ultrasonic vibration cleaning device to deeply remove residual HF acid ions from the board surface and the light-shielding tank. Finally, they are thoroughly dried using a dust-free hot air circulating drying system. This step ensures that there are no hydrofluoric acid ions remaining on the workpiece surface and in the light-shielding tank, preventing residual acid from corroding the ink and causing discoloration or reduced adhesion during subsequent curing. After drying, the workpiece remains clean and dry.

[0039] S4. Clamping and fixing: Cut the cleaned and dried large plate into multi-section long strip small plate workpieces that are suitable for the bearing fixture as needed. Paste multiple workpieces onto the flexible film of the bearing fixture and match the groove direction of the light-shielding groove with the centrifugal rotation direction of the bearing fixture.

[0040] Furthermore, the supporting fixture includes a circular iron ring carrier and a flexible film attached to the surface of the circular iron ring carrier. The flexible film is a UV protective film. Multiple workpieces are evenly arranged along the circumference of the circular iron ring carrier, and the opening direction of the light-shielding groove is parallel to the radial or diametrical direction of the circular iron ring carrier.

[0041] Specifically, the cleaned and dried large plate is cut into multiple long strips of smaller workpieces to fit the supporting fixture, resulting in multiple workpieces. A circular iron ring carrier is prepared, and a low-cost UV protective film is smoothly pasted onto its surface, forming the supporting fixture. This fixture allows for the circular array arrangement of multiple square workpieces. The UV protective film is a disposable consumable with extremely low cost. Multiple workpieces are smoothly pasted onto the UV protective film surface of the supporting fixture, and the workpieces are evenly arranged along the circumference of the circular iron ring carrier, ensuring that the opening direction of the light-shielding grooves of all workpieces is parallel to the diameter direction of the circular iron ring carrier (i.e., radial arrangement). Figure 3 As shown, the UV protective film flexibly adheres to the bottom surface of the workpiece (i.e., the non-optical back side), only blocking the non-optical back side of the workpiece, completely avoiding the light-shielding groove and the front side of the workpiece, so that all the light-shielding groove and the front side of the workpiece are fully exposed, ensuring that the subsequent ink coating and centrifugal ink mixing areas are unobstructed.

[0042] It should be noted that each supporting fixture, i.e., a single set of circular iron ring carriers, can simultaneously support and fix multiple workpieces, completing batch ink coating processing of multiple products in one go, thus achieving batch operation. The core innovative structure of the supporting fixture is to achieve the circular arrangement and clamping of multiple workpieces.

[0043] S5. Quantitative ink dispensing: Use a dispensing machine to dispense liquid light-shielding ink into each light-shielding tank in a quantitative manner.

[0044] Specifically, a general-purpose desktop dispensing machine is used. Based on the preset volume of the light-shielding groove and the ink viscosity, the dispensing amount is set, and liquid light-shielding ink is quantitatively dripped into the light-shielding groove on each workpiece. The dispensing machine controls the dispensing path through a pre-stored coordinate program. When changing product specifications, only the program parameters need to be updated; there is no need to replace the high-precision screen printing stencil or complex fixtures. The equipment purchase cost of the dispensing machine is far lower than that of a fully automatic screen printing machine. It does not require customized complex array alignment fixtures; changing product specifications only requires adjusting the dispensing coordinate program, making it highly versatile.

[0045] S6. Centrifugal Ink Spreading (Core Innovative Coating Method): The carrier is placed on a rotating centrifugal device, and the ink in the light-shielding tank is evenly spread along the tank wall by centrifugal force, and excess ink overflows onto the surface of the workpiece.

[0046] Furthermore, the rotary centrifuge device includes a turntable, and the supporting fixture is fixed on the turntable by vacuum adsorption or side mechanical clamping.

[0047] Specifically, the entire mounting fixture with the attached workpiece is placed on a rotating turntable. The turntable is equipped with both vacuum adsorption and side mechanical clamping for compatible fixation, accommodating circular iron ring carriers of different sizes. Therefore, the fixation method can be selected according to the size of the circular iron ring carrier to ensure no offset during high-speed rotation. The turntable is started and rotated at a high speed of 1000 rpm to 2000 rpm, using centrifugal force to drive the liquid light-shielding ink in the light-shielding tank to spread evenly from the inside to the outside along the channel. Under fixed ink viscosity, dispensing amount, and tank size, the ink thickness in the light-shielding tank is controlled by the dynamic balance of centrifugal force, ink viscous resistance, and surface tension, resulting in a uniformly thick wet film layer that completely covers the inner wall of the light-shielding tank. Excess ink naturally overflows to the outer edge of the workpiece under the continuous action of centrifugal force, avoiding local accumulation or ink shortage. Figure 4 As shown, the assembly relationship between the workpiece, the light-shielding groove, the ink, and the turntable is illustrated.

[0048] It should be noted that the opening direction of the light-shielding groove is parallel to the radial or diametrical direction of the circular iron ring carrier. When rotating, the direction of the centrifugal force matches the extension direction of the light-shielding groove, so that the ink is spread evenly without local ink shortages or local accumulation.

[0049] It should be understood that the present invention uses a circular iron ring carrier + UV protective film as a bearing fixture to support multiple workpieces, and uses the centrifugal force of the turntable to evenly distribute ink, replacing screen printing. There are no screen printing consumables, no need for high-precision screen printing fixtures, and only low-cost UV protective film is consumed.

[0050] Furthermore, DOE orthogonal experiments were conducted for different widths and depths of the light-shielding tanks to determine two sets of core process parameter standard windows: ① Light-shielding ink ratio: Adjusting the ratio of carbon black light-shielding powder, resin carrier, and diluent solvent to match the tank volume of different light-shielding tanks and control the ink viscosity to adapt to centrifugal spreading. ② Centrifugal speed and rotation time of the turntable: Setting gradient speeds based on the tank dimensions (i.e., tank width and depth) to ensure that the ink in the light-shielding tank is fully filled and does not leak light, while controlling the amount of ink overflow to avoid excessive ink accumulation. Two sets of process parameters can be obtained through DOE orthogonal experiments, and the calibrated parameters can be directly used during mass production to achieve stable production.

[0051] S7. Ink curing: The spread ink is cured by segmented gradient heating.

[0052] Specifically, after centrifugal ink homogenization, the mounting fixture and workpiece are placed into a hot air circulating oven. A segmented process of low-temperature pre-drying and high-temperature curing is employed. First, pre-drying is performed at 75℃~85℃ for 5 minutes, preferably at 80℃ for 5 minutes, allowing the diluent in the ink to evaporate slowly. Then, the temperature is raised to 115℃~125℃, preferably to 120℃, and maintained for 60 minutes for complete high-temperature curing, ensuring the opaque ink is fully cured. This segmented gradient heating curing method effectively prevents rapid ink shrinkage leading to bubbles or uneven curing causing delamination and peeling.

[0053] S8. Overall grinding and polishing to remove excess ink: Using the reserved thickness allowance, the entire cured workpiece is ground and polished to remove excess ink from the surface and reduce the thickness to the standard size of the finished product.

[0054] Specifically, utilizing the thickness allowance reserved before grooving, the workpiece undergoes overall planar grinding and polishing on both its top and bottom surfaces. The grinding process directly removes the cured ink layer that overflows from the workpiece surface due to centrifugal processing, eliminating the need for any solvent wiping or manual scraping. This eliminates the risks associated with manual operation, such as differences in wiping force, optical surface scratches, and ink residue. Simultaneously, the reserved thickness allowance is consumed, precisely grinding the overall thickness of the board to the finished standard dimensions. After grinding and polishing, a clean, flat, and smooth optical reference surface is formed, providing a qualified substrate for subsequent bevel processing and vacuum coating.

[0055] In some other embodiments, after step S8, a further step S9, namely the post-processing step, is included: the ground plate is cut into multi-strip blanks according to the design dimensions, such as 8-strip blanks; then the beveled surfaces of the blanks are precisely ground and polished; then a screen-printed protective film is coated on the optically transparent surface, and a beam-splitting film or anti-reflection film is vacuum-deposited, specifically using a vacuum deposition process; finally, it is cut along the cutting path to obtain independent, single-piece slotted beam-splitting prisms. The light-shielding ink in the light-shielding grooves of the finished product is fully filled and has qualified adhesion, and no light leakage is detected.

[0056] This embodiment has completed small-batch trial production on the production line. Testing showed that the ink adhesion (cross-cut test and high / low temperature cycling test) pass rate was ≥99.5%, the light-blocking effect met optical design requirements, the single-batch processing efficiency was significantly improved compared to traditional screen printing, and the overall processing cost was reduced by approximately 30%~40%, superior to traditional screen printing and single-particle dispensing processes. The process exhibits good stability and repeatability, making it suitable for large-scale industrial production of high-end optical prisms.

[0057] In summary, the complete process flow of this invention is as follows: large plate with reserved thickness allowance for grooving and forming → hydrofluoric acid pickling pretreatment → multi-stage ultrasonic pure water cleaning and drying → slitting into multi-section long strip small plate workpieces → pasting multiple workpieces onto the UV protective film of the supporting fixture (uniformly arranged circumferentially) → dispensing the light-shielding ink into each groove using a dispensing machine → fixing the supporting fixture on a turntable (vacuum adsorption / side mechanical clamping) → high-speed centrifugation of the turntable and uniform spreading of the ink in the light-shielding groove by relying on centrifugal force → segmented gradient heating to cure the ink → overall grinding and polishing of the workpiece (consuming the reserved thickness allowance and simultaneously removing surface ink overflow) → slitting into long strips → precision grinding and polishing of the beveled surface of the long strips → coating the optically transparent surface with a screen-printed protective film and vacuum coating → cutting and slitting to obtain single grooved prism finished products. This invention achieves batch light-shielding ink coating processing of large plates through the above process flow.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for batch processing of light-shielding ink coating on large grooved prism plates using a pre-acid washing and centrifugal homogenizing method, characterized in that... Includes the following steps: S1. Large plate grooving: An array of light-shielding grooves is processed on the surface of the optical glass large plate substrate, and the large plate substrate is reserved with a thickness allowance. S2. Pre-pickling treatment: Immerse the large plate after slotting in the pickling solution to corrode and roughen the inner wall of the light-shielding tank. S3. Cleaning and drying: The pickled plates are subjected to multi-stage ultrasonic pure water cleaning and hot air drying. S4. Clamping and fixing: Cut the cleaned and dried large plate into multi-section long strip small plate workpieces that are suitable for the bearing fixture as needed. Paste multiple workpieces onto the flexible film of the bearing fixture and make the groove direction of the light-shielding groove match the centrifugal rotation direction of the bearing fixture. S5. Quantitative ink dispensing: Use a dispensing machine to dispense liquid light-shielding ink into each light-shielding groove in a quantitative manner; S6. Centrifugal ink spreading: The carrier is placed on a rotating centrifugal device, and the ink in the light-shielding tank is evenly spread along the tank wall by centrifugal force, and the excess ink overflows to the surface of the workpiece. S7. Ink curing: The spread ink is cured by segmented gradient heating. S8. Overall grinding and polishing to remove excess ink: Using the reserved thickness allowance, the entire cured workpiece is ground and polished to remove excess ink from the surface and reduce the thickness to the standard size of the finished product.

2. The pre-acid washing, centrifugal homogenizing, slotted prism large-plate batch light-shielding and ink-coating process according to claim 1, characterized in that, In step S2, the pickling solution is hydrofluoric acid pickling solution with a mass concentration of 12%, the pickling temperature is controlled by constant temperature, and the temperature is 16℃~20℃. The pickling time is configured to remove microcracks and micro-chipping in the tank and form a micro-rough surface.

3. The pre-acid washing, centrifugal homogenizing, slotted prism large-plate batch light-shielding and ink-coating process according to claim 1, characterized in that, In step S4, the supporting fixture includes a circular iron ring carrier and a flexible film attached to the surface of the circular iron ring carrier. The flexible film is a UV protective film. Multiple workpieces are evenly arranged along the circumference of the circular iron ring carrier, and the opening direction of the light-shielding groove is parallel to the radial or diametrical direction of the circular iron ring carrier.

4. The pre-acid washing, centrifugal homogenizing, slotted prism large-plate batch light-shielding and ink-coating process according to claim 1, characterized in that, In step S6, the rotating centrifuge device includes a turntable, and the supporting fixture is fixed on the turntable by vacuum adsorption or side mechanical clamping. The rotation speed of the turntable is 1000 r / min to 2000 r / min.

5. The pre-acid washing, centrifugal homogenizing, slotted prism large-plate batch light-shielding and ink-coating process according to claim 1, characterized in that, In step S7, the segmented gradient heating and curing includes a low-temperature pre-baking section and a high-temperature curing section. The temperature of the low-temperature pre-baking section is 75℃~85℃, and the holding time is 5 minutes. The temperature of the high-temperature curing section is 115℃~125℃, and the holding time is 60 minutes.

6. The pre-acid washing, centrifugal homogenizing, slotted prism large-plate batch light-shielding and ink-coating process according to claim 1, characterized in that, In step S8, the overall grinding and polishing involves grinding both the upper and lower surfaces of the workpiece simultaneously, wherein the amount removed by grinding is equal to the reserved thickness allowance.

7. The pre-acid washing, centrifugal homogenizing, slotted prism large-plate batch light-shielding and ink-coating process according to claim 1, characterized in that, Following step S8, the method further includes: Post-processing steps: The ground board is cut into multi-strip materials according to the design size. The beveled surface of the strip materials is precisely ground and polished. A screen-printed protective film is coated on the optically transparent surface and a beam-splitting film or anti-reflection film is vacuum-deposited. Finally, the single slotted prism is cut into finished products.

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