Absorption type anti-blue-light film material and multilayer film system superposition coating method thereof on lens

Abstract

The invention discloses an absorption type anti-blue-light film material and a multilayer film system superposition coating method thereof on a lens. According to the invention, rare earth materials such as nano cerium oxide, europium oxide and holmium oxide are selected, and inorganic salt additives such as titanium dioxide and lead chromate are combined, so that the multi-component composite film material is formed. The special electronic structure of the rare earth element enables the material to efficiently absorb blue light of different wave bands, and the addition of the inorganic salt enhances the thermal stability and chemical inertness of the material, and avoids performance degradation in the high-temperature sintering process. All the components form a stable composite structure through oxygen loss and oxygen abstraction reactions in the sintering process, and the problem that the absorption range of a traditional single-component membrane material is narrow is solved. The surface of the lens is sequentially plated with the low-refractive-index silicon dioxide layer, the blue light absorption function layer and the diamond-like carbon protection layer to form a seven-layer film system structure, so that the blue light blocking effect is enhanced, targeted absorption of harmful wave bands is ensured by accurately controlling the thickness of each layer, and the stability of the overall optical performance is considered.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical lens coating, and particularly relates to an absorption type blue light blocking film material and a method for multi-layer film system superposition coating on a lens. Background Art

[0002] With the popularization of intelligent electronic devices, the time that the human eye is exposed to harmful blue light (380 - 500 nm, especially the high-energy band of 415 - 455 nm) has increased significantly, which is likely to cause problems such as retinal damage and visual fatigue, causing great harm to the human eye; currently, existing anti-blue light reflective coating technologies, such as using a single-layer indium tin oxide coating, block blue light through the principle of interference reflection, and the blue light blocking rate is less than 30%, having problems such as obvious reflection and affecting light transmittance.

[0003] However, currently, most blue light absorbing film materials are added with organic yellow dyes, but generally have defects such as a narrow absorption band, poor durability, or serious color deviation.

[0004] Therefore, there is an urgent need to develop a new type of anti-blue light functional film material with wide-band absorption, high light transmittance, and strong firmness. Summary of the Invention

[0005] The purpose of the present invention is to provide an absorption type blue light blocking film material and a method for multi-layer film system superposition coating on a lens to solve the above-mentioned problems.

[0006] The technical solution adopted by the present invention is as follows: An absorption type blue light blocking film material and a method for multi-layer film system superposition coating on a lens, the film material includes:

[0007] ① Nano cerium oxide: 30 - 50%; ② Nano europium oxide 10 - 20%; ③ Nano holmium oxide: 10 - 20%; ④ Nano titanium dioxide 20 - 40%; ⑤ Lead chromate 5 - 15%.

[0008] In a preferred embodiment, the method includes the following steps:

[0009] S1: Prepare an absorption type blue light blocking functional film material, mix 30 - 50% of nano cerium oxide, 10 - 20% of nano europium oxide, 10 - 20% of nano holmium oxide, 20 - 40% of nano titanium dioxide, and 5 - 15% of lead chromate by weight percentage, and grind them with a ball mill until the uniformity reaches more than 98% and the particle size is less than 50 nm;

[0010] S2: Press the mixed powder into a block under a high pressure of 300 - 330 kg per square centimeter in a static press, then break it into particles of 1 - 3 mm, and place it in a vacuum sintering furnace to sinter at 1200 - 1280 °C for 6 - 6.5 hours to obtain a blue light absorption functional film material;

[0011] S3: Vacuum electroplate the first layer of bottom nano-silica film on the surface of the lens substrate, with a refractive index of 1.46 and a thickness of 10 - 25 nanometers. Control the vacuum degree at 4.5×10-3 to 5×10-3 Pa, and the ion source bombardment time at 3 - 3.5 minutes;

[0012] S4: Sequentially electroplate the second layer of functional layer, the blue light absorption film, with a thickness of 100 - 150 nanometers, using the film material prepared in step S2, and achieve it through the vacuum electroplating process;

[0013] S5: Electroplate the third layer of matching layer, nano-silica film, with a refractive index of 1.46 and a thickness of 15 - 40 nanometers, which is used to reduce the interface reflection;

[0014] S6: Repeat electroplating the fourth layer of functional layer, the blue light absorption film, with a thickness of 100 - 150 nanometers, and continue to electroplate the fifth layer of matching layer, nano-silica film, with a thickness of 10 - 35 nanometers;

[0015] S7: Electroplate the sixth layer of functional layer, the blue light absorption film, with a thickness of 80 - 120 nanometers, and then electroplate the seventh layer of protective layer, diamond-like carbon film, with a thickness of 10 - 30 nanometers to improve the wear resistance;

[0016] S8: After completing the superposition of the seven-layer film system, test and verify that the blue light blocking rate exceeds 45%, the average visible light transmittance is greater than 85%, and the color difference index ΔE is less than 2 to ensure compliance with the optical performance requirements.

[0017] In a preferred embodiment, in step S1, when formulating the absorptive blue light blocking functional film material, first accurately weigh and mix cerium oxide nanoparticles, europium oxide nanoparticles, holmium oxide nanoparticles, titanium dioxide nanoparticles, and lead chromate according to weight percentages. Cerium oxide nanoparticles account for 30% to 50%, europium oxide nanoparticles account for 10% to 20%, holmium oxide nanoparticles account for 10% to 20%, titanium dioxide nanoparticles account for 20% to 40%, and lead chromate accounts for 5% to 15%. The mixed raw materials are ground by a high-energy ball mill to ensure that the uniformity of the mixture reaches more than 98%, and the particle size is controlled below 50 nanometers to enhance the activity and uniformity of subsequent reactions.

[0018] In a preferred embodiment, in step S2, the mixed powder is sent to a static press after ball milling and pressed into a dense block under high pressure conditions of 300 to 330 kilograms per square centimeter, and then mechanically crushed into particles of 1 to 3 millimeters. The crushed particles are placed in a vacuum sintering furnace and continuously sintered for 6 to 6.5 hours in an oxygen-free environment at 1200 to 1280 degrees Celsius. This process prompts the rare earth oxides and inorganic salt additives to undergo oxygen loss and oxygen capture reactions to form a composite coating material with broadband blue light absorption ability.

[0019] In a preferred embodiment, in step S3, a first bottom layer of nano-silica film is deposited on the surface of the lens substrate by vacuum electroplating. The refractive index of this film layer is 1.46, and the thickness is controlled between 10 nanometers and 25 nanometers. During the coating process, the system vacuum is maintained within the range of 4.5×10-3 Pa to 5×10-3 Pa, and the ion source bombardment time lasts for 3 minutes to 3.5 minutes to ensure that the film layer adheres to the substrate surface evenly and densely, providing a flat substrate for the subsequent functional layers.

[0020] In a preferred embodiment, in step S4, the second layer is a blue light absorption functional layer. Using the composite film material prepared in step S2, a film layer with a thickness of 100 to 150 nanometers is formed by vacuum electroplating technology. Through the synergistic effect of rare earth materials, this layer specifically absorbs high-energy blue light in the wavelength range of 430 to 480 nanometers, while maintaining a high transmittance of visible light, achieving the core function of a blue light blocking rate exceeding 45%.

[0021] In a preferred embodiment, in step S5, the third layer, the matching layer, continues to use low-refractive-index nano-silica material, with a thickness set at 15 to 40 nanometers and a refractive index maintained at 1.46. By adjusting the refractive index difference between adjacent film layers, this layer effectively reduces the interface reflected light, avoiding the decrease in transmittance or light interference phenomenon caused by the superposition of multiple film systems.

[0022] In a preferred embodiment, in step S6, the fourth and fifth layers are successively coated with the functional layer and the matching layer. The thickness of the fourth-layer functional layer is 100 to 150 nanometers, and the thickness of the fifth-layer matching layer is adjusted to 10 to 35 nanometers. This design enhances the blue light absorption efficiency through a multi-level cascade structure, while using the matching layer to further optimize the optical performance and reduce the risk of color deviation.

[0023] In a preferred embodiment, in step S7, the thickness of the sixth-layer functional layer is reduced to 80 to 120 nanometers to ensure maintaining the optical balance of the overall film system while absorbing blue light. Finally, the seventh-layer protective layer is coated, using diamond-like carbon film material with a thickness of 10 to 30 nanometers. This layer significantly improves the surface hardness of the film layer, and its abrasion resistance is better than 6H pencil hardness by Taber test, effectively extending the service life of the lens.

[0024] In a preferred embodiment, in step S8, after the seven-layer film system is stacked, the comprehensive performance of the lens needs to be tested. Under the CIE standard light source D65, it is verified that the average transmittance of visible light is not less than 85%, the blue light absorption rate in the 450-nanometer wavelength band exceeds 45%, and the color difference index ΔE is strictly controlled within 2. At the same time, through mechanical tests such as abrasion resistance and adhesion, it is ensured that the product meets the dual standards of optical protection and durability.

[0025] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0026] 1. In the present invention, by carefully selecting rare earth materials such as nano cerium oxide, europium oxide, and holmium oxide, and combining inorganic salt additives such as titanium dioxide and lead chromate, a multi-component composite film material is formed. The special electronic structure of rare earth elements enables them to efficiently absorb blue light in different wavelength bands, while the addition of inorganic salts enhances the thermal stability and chemical inertness of the material, avoiding performance degradation during high-temperature sintering. During the sintering process, each component forms a stable composite structure through oxygen loss and oxygen capture reactions, synergistically broadening the blue light absorption range to 430 - 480 nanometers, covering the main wavelength band of harmful high-energy blue light, and solving the problem of narrow absorption range of traditional single-component film materials.

[0027] 2. In the present invention, a low-refractive-index silica layer, a blue light absorption functional layer, and a diamond-like carbon protective layer are sequentially coated on the lens surface to form a seven-layer film system structure. The functional layer adjusts the refractive index with the matching layer through multiple superpositions, and utilizes the optical wave interference effect to enhance the blue light absorption efficiency. The silica matching layer effectively reduces interface reflection, avoids light energy loss, and at the same time balances the stress distribution between the film layers to prevent cracking. The design of the multi-layer structure not only strengthens the blue light blocking effect, but also ensures targeted absorption of harmful wavelength bands by precisely controlling the thickness of each layer, taking into account the stability of the overall optical performance.

[0028] 3. In the present invention, for the blue light wavelength band of 415 - 455 nanometers that is most harmful to the human eye, the rare earth elements in the composite film material, through selective absorption and scattering effects, combined with the interference enhancement effect of the multi-layer film system, enable the blue light blocking rate to exceed 45%. The optimization of the functional layer thickness and the film material ratio ensures that high-energy blue light is gradually weakened during penetration, while avoiding excessive interference with adjacent visible light wavelength bands, achieving efficient protection against harmful blue light and reducing the risks of retinal damage and visual fatigue.

[0029] 4. In the present invention, by reducing interface reflection through a low-refractive-index matching layer and precisely controlling the thickness of the functional layer, the average transmittance in the visible light wavelength band is increased to more than 85%. While blocking blue light, the film system design maximally retains the transmission of beneficial light, ensuring visual clarity and color restoration. The lens exhibits the characteristics of low reflectivity and high transmittance in a natural light environment, is suitable for long-term use of electronic screens, and takes into account both protection and visual comfort.

[0030] 5. In the present invention, through material ratio and structure optimization of the multi-layer film system, the color difference index ΔE is strictly controlled within 2, avoiding the common yellow color cast problem of traditional blue light blocking coatings and restoring true colors. The introduction of the diamond-like carbon film protective layer significantly enhances the surface hardness of the lens, and its abrasion resistance reaches the 6H pencil hardness standard through Taber testing, far exceeding that of conventional coatings. This design not only extends the service life of the lens, but also ensures the stability of optical performance during long-term use, meeting the durability requirements of daily protection and professional scenarios. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the film layer structure of the present invention;

[0032] Figure 2 It is a comparative curve graph of the blue light absorption spectrum in the present invention;

[0033] Figure 3 It is a comparative graph of the average visible light transmittance in the present invention. Detailed Embodiments

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] An absorption type anti-blue light film material and a multi-layer film system stacking coating method thereof on a lens. The film material includes:

[0036] ① Nano cerium oxide: 30 - 50%; ② Nano europium oxide 10 - 20%; ③ Nano holmium oxide: 10 - 20%; ④ Nano titanium dioxide 20 - 40%; ⑤ Lead chromate 5 - 15%.

[0037] The method includes the following steps:

[0038] S1: Prepare an absorption type anti-blue light functional film material. Mix 30 - 50% of nano cerium oxide, 10 - 20% of nano europium oxide, 10 - 20% of nano holmium oxide, 20 - 40% of nano titanium dioxide and 5 - 15% of lead chromate by weight percentage, and grind them with a ball mill until the uniformity reaches more than 98% and the particle size is less than 50 nm;

[0039] S2: Press the mixed powder into a block under a high pressure of 300 - 330 kg per square centimeter in a static press, then break it into particles of 1 - 3 mm, and place it in a vacuum sintering furnace to sinter for 6 - 6.5 hours at 1200 - 1280 degrees Celsius to obtain a blue light absorption functional film material;

[0040] S3: Vacuum electroplate the first layer of bottom nano silica film on the surface of the lens substrate, with a refractive index of 1.46 and a thickness of 10 - 25 nm. Control the vacuum degree at 4.5×10-3 to 5×10-3 Pa, and the ion source bombardment time is 3 - 3.5 minutes;

[0041] S4: Sequentially electroplate the second layer of functional blue light absorption film, with a thickness of 100 - 150 nm, using the film material prepared in step S2, and realize it through the vacuum electroplating process;

[0042] S5: Electroplate the third layer of matching layer nano-silica film with a refractive index of 1.46 and a thickness of 15 - 40 nanometers to reduce interface reflection;

[0043] S6: Repeatedly electroplate the fourth layer of functional layer blue light absorption film with a thickness of 100 - 150 nanometers, and continue to electroplate the fifth layer of matching layer nano-silica film with a thickness of 10 - 35 nanometers;

[0044] S7: Electroplate the sixth layer of functional layer blue light absorption film with a thickness of 80 - 120 nanometers, and then electroplate the seventh layer of protective layer diamond-like carbon film with a thickness of 10 - 30 nanometers to enhance wear resistance;

[0045] S8: After completing the superposition of the seven-layer film system, test and verify that the blue light blocking rate exceeds 45%, the average visible light transmittance is greater than 85%, and the color difference index ΔE is less than 2 to ensure compliance with the optical performance requirements.

[0046] In step S1, when formulating the absorptive blue light blocking functional film material, first accurately weigh and mix cerium oxide nanoparticles, europium oxide nanoparticles, holmium oxide nanoparticles, titanium dioxide nanoparticles, and lead chromate according to weight percentages. Cerium oxide nanoparticles account for 30% to 50%, europium oxide nanoparticles account for 10% to 20%, holmium oxide nanoparticles account for 10% to 20%, titanium dioxide nanoparticles account for 20% to 40%, and lead chromate accounts for 5% to 15%. The mixed raw materials are ground by a high-energy ball mill to ensure that the uniformity of the mixture reaches over 98% and the particle size is controlled below 50 nanometers to enhance the activity and uniformity of subsequent reactions.

[0047] In step S2, the mixed powder is sent to a static press after ball milling and pressed into a dense block under high pressure conditions of 300 to 330 kilograms per square centimeter, and then mechanically crushed into particles of 1 to 3 millimeters. The crushed particles are placed in a vacuum sintering furnace and continuously sintered for 6 to 6.5 hours in an oxygen-free environment at 1200 to 1280 degrees Celsius. This process promotes the oxygen loss and oxygen capture reactions between rare earth oxides and inorganic salt additives to form a composite coating material with broadband blue light absorption ability.

[0048] In step S3, deposit the first layer of bottom nano-silica film on the surface of the lens substrate by vacuum electroplating. The refractive index of this film layer is 1.46, and the thickness is controlled between 10 nanometers and 25 nanometers. During the coating process, the system vacuum is maintained within the range of 4.5×10-3 Pa to 5×10-3 Pa, and the ion source bombardment time lasts for 3 minutes to 3.5 minutes to ensure that the film layer adheres to the substrate surface evenly and densely, providing a flat substrate for the subsequent functional layers.

[0049] In step S4, the second layer is a blue light absorption functional layer. Using the composite film material prepared in step S2, a film layer with a thickness of 100 to 150 nanometers is formed through vacuum electroplating technology. Through the synergistic effect of rare earth materials, this layer specifically absorbs high-energy blue light in the wavelength range of 430 to 480 nanometers, while maintaining a high transmittance of visible light, achieving the core function of a blue light blocking rate exceeding 45%.

[0050] In step S5, the third layer, the matching layer, continues to use low-refractive-index nano-silica material with a thickness set to 15 to 40 nanometers and a refractive index maintained at 1.46. By adjusting the refractive index difference between adjacent film layers, this layer effectively reduces the interface reflected light, avoiding the decrease in transmittance or light interference phenomenon caused by the superposition of multi-layer film systems.

[0051] In step S6, the fourth and fifth layers are successively coated with the functional layer and the matching layer repeatedly. The thickness of the fourth layer functional layer is 100 to 150 nanometers, and the thickness of the fifth layer matching layer is adjusted to 10 to 35 nanometers. This design enhances the blue light absorption efficiency through a multi-level cascade structure, while using the matching layer to further optimize the optical performance and reduce the risk of color deviation.

[0052] In step S7, the thickness of the sixth layer functional layer is reduced to 80 to 120 nanometers to ensure maintaining the optical balance of the overall film system while absorbing blue light. Finally, the seventh layer, the protective layer, is coated with diamond-like carbon film material with a thickness of 10 to 30 nanometers. This layer significantly improves the surface hardness of the film layer, and its abrasion resistance is better than 6H pencil hardness by Taber test, effectively extending the service life of the lens.

[0053] In step S8, after completing the superposition of the seven-layer film system, the comprehensive performance of the lens needs to be tested. Under the CIE standard light source D65, it is verified that the average transmittance of visible light is not less than 85%, the blue light absorption rate in the 450-nanometer wavelength band exceeds 45%, and the color difference index ΔE is strictly controlled within 2. At the same time, through mechanical tests such as abrasion resistance and adhesion, it is ensured that the product meets the dual standards of optical protection and durability.

[0054] It can be known from the above that:

[0055] In the present invention, by selecting rare earth materials such as nano-cerium oxide, europium oxide, and holmium oxide, and combining inorganic salt additives such as titanium dioxide and lead chromate, a multi-component composite film material is formed. The special electronic structure of rare earth elements enables them to efficiently absorb blue light in different wavelength bands, while the addition of inorganic salts enhances the thermal stability and chemical inertness of the material, avoiding performance degradation during the high-temperature sintering process. Each component forms a stable composite structure through oxygen loss and oxygen capture reactions during the sintering process, synergistically broadening the blue light absorption range to 430 - 480 nanometers, covering the main wavelength band of harmful high-energy blue light, and solving the problem of narrow absorption range of traditional single-component film materials.

[0056] In the present invention, a low-refractive-index silica layer, a blue-light absorption functional layer, and a diamond-like carbon protective layer are sequentially deposited on the lens surface to form a seven-layer film system structure. The functional layer enhances the blue-light absorption efficiency by means of multiple superpositions and refractive-index adjustment of the matching layer, utilizing the optical-wave interference effect. The silica matching layer effectively reduces the interface reflection, avoids light-energy loss, and at the same time balances the stress distribution between the film layers to prevent cracking. The design of the multi-layer structure not only strengthens the blue-light blocking effect, but also ensures the targeted absorption of the harmful wavelength band and takes into account the stability of the overall optical performance by precisely controlling the thickness of each layer.

[0057] In the present invention, for the blue-light wavelength band of 415 - 455 nm, which is the most harmful to the human eye, the rare-earth elements in the composite film material, through selective absorption and scattering effects, combined with the interference enhancement effect of the multi-layer film system, enable the blue-light blocking rate to exceed 45%. The optimization of the functional layer thickness and the film material ratio ensures that the high-energy blue light is gradually weakened during the penetration process, while avoiding excessive interference with the adjacent visible-light wavelength band, achieving efficient protection against harmful blue light and reducing the risks of retinal damage and visual fatigue.

[0058] In the present invention, by reducing the interface reflection through the low-refractive-index matching layer and combining with the precise control of the functional layer thickness, the average transmittance in the visible-light wavelength band (400 - 700 nm) is increased to more than 85%. While blocking blue light, the film system design maximally retains the transmission of beneficial light rays to ensure visual clarity and color rendition. The lens exhibits the characteristics of low reflectivity and high transmittance in a natural-light environment, is suitable for long-term use in front of an electronic screen, and takes into account both protection and visual comfort.

[0059] In the present invention, through the material ratio and structure optimization of the multi-layer film system, the color difference index ΔE is strictly controlled within 2, avoiding the common yellow color cast problem of traditional blue-light blocking coatings and restoring the true color. The introduction of the diamond-like carbon film protective layer significantly enhances the surface hardness of the lens, and its abrasion resistance reaches the 6H pencil hardness standard through the Taber test, far exceeding that of conventional coatings. This design not only extends the service life of the lens, but also ensures the stability of the optical performance during long-term use, meeting the durability requirements for daily protection and professional scenarios.

[0060] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the said element.

[0061] The foregoing description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An absorptive anti-blue light film material and a method for coating a multi-layer film system on a lens, characterized in that: The film material includes: ① Nano cerium oxide: 30 - 50%; ② Nano europium oxide 10 - 20%; ③ Nano holmium oxide: 10 - 20%; ④ Nano titanium dioxide 20 - 40%; ⑤ Lead chromate 5 - 15%.

2. The multi-layer film system superposition coating method of an absorption type anti-blue light film material on a lens according to claim 1, characterized in that: The method includes the following steps: S1: Prepare the absorptive blue-light-blocking film material. Mix nano cerium oxide 30 - 50%, nano europium oxide 10 - 20%, nano holmium oxide 10 - 20%, nano titanium dioxide 20 - 40% and lead chromate 5 - 15% by weight percentage, and grind them in a ball mill until the uniformity reaches over 98% and the particle size is less than 50 nm. S2: Press the mixed powder into a block under a high pressure of 300 - 330 kg per square centimeter in a static press, then crush it into particles of 1 - 3 mm, and place it in a vacuum sintering furnace to sinter at 1200 - 1280 °C for 6 - 6.5 hours to obtain the blue-light-absorbing film material. S3: Vacuum electroplate the first layer of bottom nano silica film on the surface of the lens substrate, with a refractive index of 1.46 and a thickness of 10 - 25 nm. Control the vacuum degree at 4.5×10-3 to 5×10-3 Pa, and the ion source bombardment time is 3 - 3.5 minutes. S4: Sequentially electroplate the second layer of functional layer blue-light-absorbing film, with a thickness of 100 - 150 nm, using the film material prepared in step S2, and achieve it through the vacuum electroplating process. S5: Electroplate the third layer of matching layer nano silica film, with a refractive index of 1.46 and a thickness of 15 - 40 nm, to reduce the interface reflection. S6: Repeat electroplating the fourth layer of functional layer blue-light-absorbing film, with a thickness of 100 - 150 nm, and continue electroplating the fifth layer of matching layer nano silica film, with a thickness of 10 - 35 nm. S7: Electroplate the sixth layer of functional layer blue-light-absorbing film, with a thickness of 80 - 120 nm, and then electroplate the seventh layer of protective layer diamond-like carbon film, with a thickness of 10 - 30 nm, to improve the wear resistance. S8: After completing the superposition of the seven-layer film system, test and verify that the blue-light blocking rate exceeds 45%, the average visible light transmittance is greater than 85%, and the color difference index ΔE is less than 2 to ensure compliance with the optical performance requirements.

3. The multi-layer film system superposition coating method of an absorption type anti-blue light film material on a lens according to claim 1, characterized in that: In step S1, when preparing the absorptive blue-light-blocking film material, first accurately weigh and mix nano cerium oxide, nano europium oxide, nano holmium oxide, nano titanium dioxide and lead chromate by weight percentage. The proportion of nano cerium oxide is 30% to 50%, the proportion of nano europium oxide is 10% to 20%, the proportion of nano holmium oxide is 10% to 20%, the proportion of nano titanium dioxide is 20% to 40%, and the proportion of lead chromate is 5% to 15%. The mixed raw materials are ground by a high-energy ball mill to ensure that the uniformity of the mixture reaches over 98% and the particle size of the particles is controlled below 50 nm.

4. The multi-layer film system superposition coating method of an absorption type anti-blue light film material on a lens according to claim 1, characterized in that: In step S2, the mixed powder is sent to a static press after ball milling and pressed into a dense block under a high pressure of 300 to 330 kg / cm², and then mechanically crushed into particles with a size of 1 to 3 mm. The crushed particles are placed in a vacuum sintering furnace and sintered continuously for 6 to 6.5 hours in an oxygen-free environment at 1200 to 1280 °C. This process promotes the oxygen loss and oxygen capture reactions between rare earth oxides and inorganic salt additives to form a composite coating material with broadband blue light absorption ability.

5. The multi-layer film system superposition coating method of an absorption type anti-blue light film material on a lens according to claim 1, characterized in that: In step S3, a first layer of bottom nano-silica film is deposited on the surface of the lens substrate by vacuum electroplating. The refractive index of this film layer is 1.46, and the thickness is controlled between 10 nm and 25 nm. During the coating process, the system vacuum is maintained in the range of 4.5×10⁻³ Pa to 5×10⁻³ Pa, and the ion source bombardment time lasts for 3 to 3.5 minutes to ensure that the film layer adheres to the substrate surface evenly and densely, providing a flat substrate for the subsequent functional layer.

6. The multi-layer film system superposition coating method of an absorption type anti-blue light film material on a lens according to claim 1, characterized in that: In step S4, the second layer is a blue light absorption functional layer, and the composite film material prepared in step S2 is used to form a film layer with a thickness of 100 to 150 nm through vacuum electroplating technology.

7. A multi-layer film system superposition coating method of an absorption type anti-blue light film material on a lens according to claim 1, characterized in that: In step S5, the third layer of the matching layer continues to use low refractive index nano-silica material, with a thickness set at 15 to 40 nm and a refractive index maintained at 1.

46.

8. A multi-layer film system superposition coating method of an absorption type anti-blue light film material on a lens according to claim 1, characterized in that: In step S6, the fourth layer and the fifth layer are successively coated with the functional layer and the matching layer. The thickness of the fourth layer of the functional layer is 100 to 150 nm, and the thickness of the fifth layer of the matching layer is adjusted to 10 to 35 nm.

9. A method for depositing a multi-layer film system of an absorption-type blue light blocking film material on a lens as claimed in claim 1, characterized in that: In step S7, the thickness of the sixth layer of the functional layer is reduced to 80 to 120 nm to ensure maintaining the optical balance of the overall film system while absorbing blue light. Finally, a seventh layer of protective layer is coated, using diamond-like carbon film material with a thickness of 10 to 30 nm.

10. The multi-layer film system superposition coating method of an absorption type anti-blue light film material on a lens according to claim 1, characterized in that: In step S8, after the seven-layer film system is stacked, the comprehensive performance of the lens needs to be tested. Under the CIE standard light source D65, it is verified that the average visible light transmittance is not less than 85%, the blue light absorption rate in the 450 nm band exceeds 45%, and the color difference index ΔE is strictly controlled within 2.

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