# US 12,761,401 B2 · Augmented reality optical lens with eye protection function and preparation method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,761,401 B2 - Document ID: US12761401B2 - Status: Granted - Kind: B2 - Application number: 19/281,650 - Filed: 2025-07-26 - Published: 2025-11-20 - Granted: 2026-10-13 - Earliest claimed: 2025-03-03 - Assignees: Moldnano (Hangzhou) Technology Co., Ltd. - Applicants: Moldnano (Hangzhou) Technology Co., Ltd. - Inventors: Min Qiu; Kaikai Du; Lu Cai - Web page: https://patentgrep.com/patent/US12761401B2 ## CPC - G02B 1/14: Protective coatings, e.g. hard coatings - G02B 1/11: Anti-reflection coatings - G02B 27/0012: {Optical design, e.g. procedures, algorithms, optimisation routines} - C23C 14/35: by application of a magnetic field, e.g. magnetron sputtering {(C23C14/3457 takes precedence)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) ## Abstract The present disclosure provides an augmented reality optical lens with eye protection function and a preparation method therefor, addressing the issues of heat dissipation and eye protection in head-mounted display devices. The lens uses silicon carbide as a substrate, with specific optical thin-film structures on both sides. When the device generates heat, a heating element is connected to the lens by means of a thermally conductive tape, and the heat is dissipated by utilizing a thermal conductivity of silicon carbide. Heat dissipation is enhanced through heat exchange with air and by regulating a direction of infrared radiation, preventing human eyes from thermal radiation. The present disclosure integrates heat dissipation and eye protection functions, features a simple process and high yield, meets the demands for miniaturization, long battery life, and eye protection in head-mounted devices, enhances user experience, and promotes the development of augmented reality technology devices. ## Claims ### Claim 1 An augmented reality optical-lens device with eye protection function, comprising: a lens which comprises a substrate made of silicon carbide material, with optical thin-film structures disposed on both sides of the substrate, respectively; wherein the optical thin-film structure on a side facing a human eye sequentially comprises an infrared radiation layer, an infrared reflection layer, and a low-refractive-index dielectric layer; and the optical thin-film structure on a side facing an environment sequentially comprises an infrared reflection layer and an infrared radiation layer; and a thermally conductive tape, with one end thermally connected to the lens, and the other end arranged outside the lens and connecting at least one heating element in the device; wherein when the at least one heating element in the device generates heat, the heat is distributed across the lens by utilizing a thermal conductivity of silicon carbide for heat exchange and dissipation with surrounding air; and in outdoor conditions, optical thin films are used to regulate a direction of infrared radiation, so that the heat radiates away from the human eye in an atmospheric window band; wherein the infrared radiation layer facing the environment has an infrared emissivity of above 0.5 in the atmospheric window band, the infrared radiation layer facing the human eye has an infrared emissivity of below 0.6 in the atmospheric window band; both of the infrared radiation layers have a transmittance of above 0.55 in a wavelength range from 455 nm to 700 nm and of no more than 0.7 in a wavelength range from 200 nm to 380 nm, and block over 5% of blue light in a wavelength range from 380 nm to 455 nm; the atmospheric window band of the infrared reflection layers is between 8 μm and 14 μm, and the infrared reflection layers are made of an optical thin-film material with high transmittance in a visible light range and a reflectivity of above 50% in the atmospheric window band. ### Claim 2 (depends on 1) The augmented reality optical lens with eye protection function according to claim 1, wherein a thickness of the substrate is in a range from 0.2 mm to 4 mm. ### Claim 3 (depends on 2) The augmented reality optical lens with eye protection function according to claim 2, wherein the infrared radiation layers adopt a film layer structure with alternating high- and low-refractive-index materials, the high-refractive-index material is titanium dioxide or hafnium dioxide, and the low-refractive-index material is silicon dioxide, with a total alternating film layer count ranging from 4 to 50 and each layer having a thickness ranging from 5 nm to 500 nm. ### Claim 4 (depends on 3) The augmented reality optical lens with eye protection function according to claim 3, wherein the infrared reflection layer facing the human eye has a thickness of 100 nm, and the infrared reflection layer facing the environment has a thickness of 10 nm. ### Claim 5 (depends on 4) A preparation method for an augmented reality optical lens with eye protection function according to claim 4, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 6 (depends on 5) The preparation method according to claim 5, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 7 (depends on 3) A preparation method for an augmented reality optical lens with eye protection function according to claim 3, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 8 (depends on 7) The preparation method according to claim 7, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 9 (depends on 2) The augmented reality optical lens with eye protection function according to claim 2, wherein the infrared reflection layer facing the human eye has a thickness of 100 nm, and the infrared reflection layer facing the environment has a thickness of 10 nm. ### Claim 10 (depends on 9) A preparation method for an augmented reality optical lens with eye protection function according to claim 9, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 11 (depends on 10) The preparation method according to claim 10, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 12 (depends on 2) A preparation method for an augmented reality optical lens with eye protection function according to claim 2, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 13 (depends on 12) The preparation method according to claim 12, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 14 (depends on 1) The augmented reality optical lens with eye protection function according to claim 1, wherein the low-refractive-index dielectric layer facing the human eye is made of magnesium fluoride with a thickness ranging from 5 nm to 500 nm. ### Claim 15 (depends on 14) The augmented reality optical lens with eye protection function according to claim 14, wherein the infrared reflection layer facing the human eye has a thickness of 100 nm, and the infrared reflection layer facing the environment has a thickness of 10 nm. ### Claim 16 (depends on 15) A preparation method for an augmented reality optical lens with eye protection function according to claim 15, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 17 (depends on 16) The preparation method according to claim 16, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 18 (depends on 14) A preparation method for an augmented reality optical lens with eye protection function according to claim 14, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 19 (depends on 18) The preparation method according to claim 18, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 20 (depends on 1) The augmented reality optical lens with eye protection function according to claim 1, wherein the infrared reflection layers are made of indium tin oxide, with a layer count ranging from 1 to 10 and each layer having a thickness ranging from 5 nm to 500 nm. ### Claim 21 (depends on 20) The augmented reality optical lens with eye protection function according to claim 20, wherein the infrared reflection layer facing the human eye has a thickness of 100 nm, and the infrared reflection layer facing the environment has a thickness of 10 nm. ### Claim 22 (depends on 21) A preparation method for an augmented reality optical lens with eye protection function according to claim 21, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 23 (depends on 22) The preparation method according to claim 22, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 24 (depends on 20) A preparation method for an augmented reality optical lens with eye protection function according to claim 20, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 25 (depends on 24) The preparation method according to claim 24, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 26 (depends on 1) The augmented reality optical lens with eye protection function according to claim 1, wherein the thermally conductive tape is made of graphene or copper tape. ### Claim 27 (depends on 26) The augmented reality optical lens with eye protection function according to claim 26, wherein the infrared reflection layer facing the human eye has a thickness of 100 nm, and the infrared reflection layer facing the environment has a thickness of 10 nm. ### Claim 28 (depends on 27) A preparation method for an augmented reality optical lens with eye protection function according to claim 27, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 29 (depends on 28) The preparation method according to claim 28, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 30 (depends on 26) A preparation method for an augmented reality optical lens with eye protection function according to claim 26, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 31 (depends on 30) The preparation method according to claim 30, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 32 (depends on 1) The augmented reality optical lens with eye protection function according to claim 1, wherein the infrared reflection layer facing the human eye has a thickness of 100 nm, and the infrared reflection layer facing the environment has a thickness of 10 nm. ### Claim 33 (depends on 32) A preparation method for an augmented reality optical lens with eye protection function according to claim 32, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 34 (depends on 33) The preparation method according to claim 33, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating. ### Claim 35 (depends on 1) A preparation method for an augmented reality optical lens with eye protection function according to claim 1, comprising: S00, inputting optimization objectives into simulation software, comprising visible light transmittance and infrared emissivity; S10, inputting an initial structure, establishing a model of a lens, optimizing a thickness of each layer using the simulation software to obtain a final optimized thickness of each layer of the lens, thereby obtaining final design values; and S20, depositing materials sequentially on a substrate according to the final design values using a thin film deposition method. ### Claim 36 (depends on 35) The preparation method according to claim 35, wherein the materials are sequentially deposited on the substrate according to the final design values through electron beam evaporation coating or magnetron sputtering coating.