Head wearing device with light filtering function

Abstract

The invention discloses a head wearing device with a light filtering function. The head wearing device comprises a light-transmitting basic component and a light filtering medium attached to the surface of the light-transmitting basic component or dispersed in the light-transmitting basic component. After the light-transmitting basic component is combined with the light filtering medium, light rays with the wavelength ranging from 560 nm to 1200 nm (the average transmittance is larger than or equal to 80%) can selectively transmit the light-transmitting basic component, ultraviolet rays and high-energy blue light with the wavelength ranging from 200 nm to 505 nm (the transmittance is smaller than or equal to 5%) can be blocked, and the transmittance at the position of 555 nm is 40% to 50%. According to the light filtering medium, the long-wave-pass light filtering characteristic is achieved through the synergistic effect of the polyether modified organic light absorbing material and the nano titanium oxide. According to the invention, the defect that the traditional sunscreen mask blocks the sight line is overcome, red light and near-infrared light capable of promoting the generation of collagen are highly transmitted while a blackening and aging short-wave light source is absolutely blocked, moderate light transmission is kept at 555 nm to ensure the clear riding sight line, and perfect combination of physical protection and passive photon whitening is realized.

Description

Technical Field

[0001] This invention relates to the fields of optical protection and photonic beauty technology. Specifically, it relates to a headwear device that can selectively filter light of specific wavelengths and has phototherapy whitening and anti-photoaging functions, including but not limited to helmets, face shields, and sun hat brims. Background Technology

[0002] As people gain a deeper understanding of skin health and photoaging, the sun protection function of wearable head devices (such as electric scooter helmets and outdoor sun hats) is receiving increasing attention. However, existing sun protection masks or sun hats mainly suffer from the following irreconcilable technical contradictions: The contradiction between "full sun protection" and "visual safety": Although traditional dark sunglasses-style masks can block strong light, they can severely obstruct vision at night, on rainy days, or when entering tunnels, posing a great traffic safety hazard.

[0003] The contradiction between "UV protection" and "blocking beneficial light": Existing transparent UV-protective face masks can only block ultraviolet rays below 400nm. However, medical research shows that high-energy short-wave blue light with wavelengths between 400-500nm is also a major cause of melanin deposition and photoaging of the skin. Even more regrettably, red light with wavelengths between 600-700nm and some near-infrared (NIR) light in the solar spectrum actually has a "photorejuvenating" effect, promoting collagen secretion from facial skin fibroblasts and accelerating microcirculation. Traditional sunscreen coatings often employ a "one-size-fits-all" broad-band blocking or broad-band transmission strategy, failing to achieve selective filtering. Summary of the Invention

[0004] The purpose of this invention is to provide a headwear device with light filtering function, which aims to solve the technical problems of existing helmets, masks or sun hats that cannot simultaneously ensure high-definition vision, block melanin-inducing light, and allow beneficial light for phototherapy and skin rejuvenation.

[0005] A head-wearable device with light filtering function includes a light-transmitting base component and a light filtering medium. The light filtering medium is attached to the surface of the light-transmitting base component or dispersed inside the light-transmitting base component. After the light-transmitting base component is combined with the light filtering medium, it can selectively transmit light with wavelengths in the range of 560nm to 1200nm and block light with wavelengths in the range of 200nm to 505nm.

[0006] Preferably, the light filtering medium is an optical film, which is attached to at least one surface of the light-transmitting base component.

[0007] Preferably, the light filtering medium is a light absorber, which is mixed into the matrix material of the light-transmitting base component and integrally injection molded with the light-transmitting base component.

[0008] Preferably, the head-wearing device is a helmet, and the light-transmitting base component is a protective face shield disposed on the front side of the helmet.

[0009] Preferably, the headwear device is a sun hat, and the light-transmitting base component is the brim of the sun hat.

[0010] Preferably, when the light-transmitting base component is combined with the light filtering medium, the transmittance is less than or equal to 5% in the wavelength range of 200nm to 505nm, the average transmittance is greater than or equal to 80% in the wavelength range of 560nm to 1200nm, and the transmittance at a wavelength of 555nm is 40% to 50%.

[0011] Preferably, the optical film is a multilayer physical adhesive film, which comprises, from the inside out: an adhesive layer for attaching to the surface of the light-transmitting base component; an optical base film layer, the material of which is selected from at least one of polyethylene terephthalate (PET), thermoplastic polyurethane elastomer (TPU) or polycarbonate (PC); and a selective filtering coating attached to and cured on the outer surface of the optical base film layer.

[0012] Preferably, the selective light-filtering coating is formed by curing a homogeneous or semi-homogeneous liquid material containing the following components, by mass fraction: 35-55 parts of a polyurethane flexible matrix; 15-25 parts of a polyether-modified organic selective light-absorbing material; 8-15 parts of a nano-titanium oxide dispersed phase; 10-20 parts of an acrylate-reinforced polyurethane rigid film-forming component; and 3-8 parts of a polyurethane adhesive additive.

[0013] Preferably, the matrix material of the light-transmitting base component is selected from at least one of polycarbonate, polymethyl methacrylate or polyester; the light absorber includes polyether-modified organic selective light-absorbing material and nano-titanium oxide, and the mass percentage of the light absorber in the matrix material is 0.1% to 5.0%.

[0014] Preferably, the light filter medium is configured to block ultraviolet light and high-energy short-wave blue light that cause melanin deposition and photoaging, and to allow yellow light, red light and near-infrared light that promote collagen production to achieve phototherapy whitening protection for the wearer's face.

[0015] The beneficial effects of this invention are as follows: This invention innovatively introduces the concept of long-wavelength photon beauty: breaking away from the traditional mindset that head protection equipment only pursues "light blocking." Through a specific light filtering medium, this device achieves an average transmittance of over 80% in the 560nm to 1200nm wavelength range, perfectly covering the yellow, red, and near-infrared light bands. When the wearer is under natural light, the light in this band can penetrate the mask and reach the dermis layer of the face, producing a photobiological regulatory effect, stimulating collagen regeneration, and achieving physical-level photon skin rejuvenation and whitening effects.

[0016] In the core optical curve design of this invention, the transmittance is ≤5% in the wavelength range of 200nm to 505nm. This means that high-energy short-wave blue light and ultraviolet light across the entire spectrum, which cause skin tanning and photoaging, are completely blocked. Simultaneously, this invention cleverly sets the steep cutoff point of the transmittance curve at 555nm (transmittance 40%-50%). 555nm is the yellow-green light wavelength to which the human eye is most sensitive under photopic vision. Preserving appropriate transmittance at this wavelength ensures that the wearer can still obtain a clear vision with extremely high contrast while blocking glaring blue light, completely solving the pain point of poor visibility for electric vehicle riders at night / in tunnels.

[0017] For the film application solution, this invention innovatively adopts a polyurethane-acrylate interpenetrating network system to stably disperse polyether-modified light-absorbing materials and nano-titanium oxides, ensuring both extreme long-wavelength optical properties and giving the outer layer of the film excellent scratch resistance. For the injection molding solution, a doping ratio of 0.1%-5.0% is specified, solving the problem of agglomeration and blackening of functional particles in high-temperature melts such as polycarbonate, and ensuring that the helmet visor meets the national standard for impact resistance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a head-wearing device with light filtering function in an embodiment of the present invention; Figure 2 This is a transmittance spectrum test diagram of an optical filter medium in one embodiment of the present invention.

[0020] Figure 3 The transmittance spectra of the multilayer physical adhesive film prepared in Example 2 of the present invention and the prior art (Comparative Example 1 and Comparative Example 2) are compared in the 200nm to 1200nm wavelength range. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. After understanding the technical solutions of this invention, those skilled in the art can, based on the core ideas of this invention, make non-substantial substitutions and adjustments to materials, equipment, and process parameters according to common knowledge in the art; such substitutions and adjustments all fall within the protection scope of this invention.

[0022] In this document, unless otherwise expressly stated, terms such as “comprising,” “including,” “containing,” or “having” are intended to cover non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to those processes, methods, articles, or apparatus. The term “and / or” in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Modifiers such as “first” and “second” used in this document are only used to distinguish different constituent elements and do not constitute a limitation on the order, importance, or number of constituent elements.

[0023] The "optical filtering medium" referred to in this invention refers to a physical or chemical system capable of selectively absorbing, reflecting, or interfering with the incident spectrum, thereby altering the transmission spectral distribution. The "long-pass filtering" referred to in this invention refers to the optical property of having high transmittance of light above a specific cutoff wavelength, while having extremely low transmittance or being completely blocked of light below that cutoff wavelength. The "average transmittance" referred to in this invention refers to the ratio of the integrated transmitted energy to the integrated incident energy of a material within a specified wavelength range.

[0024] This invention provides a head-wearable device with light filtering function, comprising a light-transmitting base component and a light-filtering medium. The light-filtering medium is attached to the surface of the light-transmitting base component or dispersed within the light-transmitting base component. After the light-transmitting base component is combined with the light-filtering medium, it can selectively transmit light with wavelengths in the range of 560nm to 1200nm and block light with wavelengths in the range of 200nm to 505nm.

[0025] The preparation method and technical effects of the present invention will be described in detail below through several specific embodiments.

[0026] Example 1: Preparation of selective light-filtering liquid materials This embodiment provides a selective optical filtering liquid material for forming an optical filtering medium. The liquid material is a homogeneous or semi-homogeneous coatable dispersion system. The liquid material formulation of this embodiment, by mass fraction, is as follows: Aliphatic polyurethane acrylate flexible matrix: 45.0%; Polyether-modified organic selective light-absorbing materials: 20.0%; Nano-titanium oxide dispersion: 12.0%; Hexafunctional pentaerythritol acrylate hard film-forming component: 15.0%; Silane coupling agent modified polyurethane adhesive additive: 5.0%; In addition, propylene glycol methyl ether acetate (PMA) is added at 30% of the total mass as a solvent and leveling agent.

[0027] The specific preparation steps of the above-mentioned selective light-filtering liquid material are as follows: Step 1.1 (Pretreatment of the dispersed phase of nano-titanium oxide): Take rutile nano-titanium dioxide powder with a primary particle size distribution between 20 nm and 30 nm. Place the nano-titanium dioxide powder in a high-speed mixer and slowly spray it with stearic acid at a mass fraction of 2% of its own weight and titanate coupling agent. Stir and mix at high speed at 110 degrees Celsius for 45 minutes to completely coat and modify the surface of the nanoparticles, thereby reducing the surface energy of the nanoparticles and preventing agglomeration in the subsequent organic system, thus obtaining modified nano-titanium oxide powder.

[0028] Step 1.2 (Grinding of Functional Slurry): The modified nano-titanium oxide powder obtained in Step 1.1 and the polyether-modified organic selective light-absorbing material are added to a high-speed dispersion vessel equipped with a water bath cooling jacket according to the formula ratio. Half the total solvent volume of PMA solvent is added. The disperser is turned on and pre-dispersed at 2500 rpm for 30 minutes. The mixture is then pumped into a horizontal sand mill and ground continuously for 120 minutes using 0.3 mm diameter zirconia grinding beads under circulating water cooling (with the material temperature controlled not to exceed 40 degrees Celsius). Laser particle size analysis shows that the D90 of the particles in the slurry is less than 80 nm, achieving nanoscale homogeneous dispersion, thus obtaining a highly stable functional slurry.

[0029] Step 1.3 (Construction of the prepolymer network): In another reactor equipped with an anchor stirrer and a reflux condenser, aliphatic polyurethane acrylate flexible matrix and hexafunctional pentaerythritol acrylate rigid film-forming component are added sequentially, along with the remaining PMA solvent. The reactor is heated to 60 degrees Celsius and stirred at a constant speed of 800 rpm for 60 minutes to ensure thorough mixing of the flexible long-chain macromolecules and the high-functionality rigid monomers, forming a prepolymer interpenetrating network structure.

[0030] Step 1.4 (Compounding and Degassing): Under light-protected conditions, the high-stability functional slurry obtained in Step 1.2 is slowly filtered through a 200-mesh filter and added dropwise to the reactor in Step 1.3 at a dropping rate controlled at 2 kg / min. After the addition is complete, the prescribed amount of silane coupling agent modified polyurethane adhesive is added. The stirring speed is reduced to 400 rpm, and stirring continues for 120 minutes. Subsequently, the vacuum pump is turned on, and ultrasonic degassing is performed at a vacuum of -0.08 MPa for 45 minutes to completely remove the tiny air bubbles inside the liquid material, finally obtaining a pale yellow transparent selective light-filtering liquid material.

[0031] Example 2: Preparation of a multilayer physical adhesive film Based on the selective light-filtering liquid material prepared in Example 1, this embodiment provides a multilayer physical adhesive film that can be directly attached to the surface of the light-transmitting base component of a head-wearable device.

[0032] The preparation steps are as follows: Step 2.1 (Base Film Surface Treatment): Select an optical-grade thermoplastic polyurethane elastomer (TPU) film with a thickness of 100 micrometers as the optical base film layer. Pass the TPU film through a corona treatment machine at a speed of 15 m / min, with the discharge power set to 2.0 kW, and perform corona discharge treatment on one surface (coated side) of the base film to increase its surface tension to above 42 dyn / cm, ensuring excellent adhesion of subsequent coatings.

[0033] Step 2.2 (Microgravure Precision Coating): The selective filtering liquid material prepared in Example 1 is injected into the feed tank of the microgravure coating machine. Using a gravure roller with a screen ruling of 150 LPI, the liquid material is uniformly coated onto the corona-treated surface of the TPU film in a constant temperature and humidity cleanroom (Class 100 cleanliness, temperature 22°C, relative humidity 50%). The coating speed is set to 10 m / min, and the wet film thickness is controlled by adjusting the doctor blade pressure and coating gap.

[0034] Step 2.3 (Gradient Drying and Crosslinking Curing): The coated film is then placed in a 15-meter-long five-stage hot air drying oven. The temperatures of the five stages are set as follows: Stage 1: 65°C, Stage 2: 85°C, Stage 3: 105°C, Stage 4: 115°C, and Stage 5: 100°C. The purpose of the gradient temperature increase is to allow the PMA solvent to evaporate smoothly from the inside of the coating to the outside, preventing rapid skinning on the surface and resulting in pinhole defects caused by internal solvent encapsulation. After drying, the film enters an ultraviolet (UV) curing oven, where a photo-initiated crosslinking curing reaction is carried out under the irradiation of a high-pressure mercury lamp with a wavelength of 365nm. The conveyor belt speed is set so that the cumulative UV energy density received by the film surface reaches 850mJ / cm2. After curing, a selective filter coating with a precisely controlled thickness of 10 micrometers is formed on the surface of the TPU base film.

[0035] Step 2.4 (Adhesive Backing and Lamination): On the other side (uncoated side) of the TPU optical base film layer, a 15-micron thick layer of optical-grade acrylic pressure-sensitive adhesive is applied using a comma-shaped doctor blade coater (as an mounting adhesive layer). After drying in an 80-degree Celsius oven to remove the solvent from the pressure-sensitive adhesive, it is immediately rolled and laminated with a 50-micron thick release PET film. Finally, the film is wound up to obtain the finished physical bonding film of this embodiment.

[0036] Example 3: Preparation of a light-filtering helmet visor with an adhesive film This embodiment provides a head-wearing device, specifically an electric bicycle protective helmet.

[0037] The helmet comprises a rigid ABS shell, an internal EPS cushioning layer, and a light-transmitting base component hinged to the front of the shell. In this embodiment, the light-transmitting base component is a transparent curved protective visor injection molded from polycarbonate (PC) material, with a thickness of 2.5 mm and a visible light transmittance of more than 90% in the central area.

[0038] The multi-layered physical bonding film prepared in Example 2 was die-cut according to the two-dimensional unfolded contour of the helmet visor. The release PET film on the bonding film was peeled off, exposing the adhesive layer. In a dust-free environment, a small amount of bonding liquid (pure water containing a very small amount of neutral detergent) was evenly sprayed onto the outer surface of the helmet visor, and then the adhesive layer of the physical bonding film was aligned and attached to the visor. A flexible scraper was used to smoothly scrape and press from the center of the visor outwards to remove moisture and air bubbles. After standing for 24 hours, the pressure-sensitive adhesive fully exerted its adhesiveness, and the physical bonding film and the PC visor were firmly bonded together, forming a helmet with light filtering function.

[0039] Example 4: Preparation of a light-filtering sun hat with an adhesive film This embodiment provides a headwear device, specifically an outdoor sun protection hat.

[0040] The sun hat includes a fabric crown and a rigid brim extending forward. In this embodiment, the light-transmitting base component is the brim of the sun hat, which is made of transparent polymethyl methacrylate (PMMA, acrylic) with a thickness of 1.5 mm.

[0041] Following the same film-applying process as in Example 3, the multi-layered physical adhesive film prepared in Example 2 was cut and attached to the upper surface of the PMMA brim. After attachment, the flexibility of the physical adhesive film perfectly matched the curvature of the PMMA brim, creating a sun hat with phototherapy whitening function.

[0042] Example 5: Preparation of light-filtering functional injection molding masterbatch This embodiment provides a high-concentration light absorber masterbatch for one-piece injection molding.

[0043] Step 5.1: Take the polyether-modified organic selective light-absorbing material and the modified nano titanium oxide powder (mass ratio of the two is 20:12) in the formula ratio, put them in a high-speed mixer and mix them evenly to obtain composite light absorber powder.

[0044] Step 5.2: Select optical-grade polycarbonate (PC) resin granules with a melt index of 10 g / 10 min (300 degrees Celsius / 1.2 kg). Dry the PC resin granules continuously in a dehumidifying dryer at 120 degrees Celsius for 4 hours until the moisture content is reduced to below 0.02%.

[0045] Step 5.3: Add PC resin granules and composite light absorber powder to the main feed inlet of the twin-screw extruder at a mass ratio of 85:15. The length-to-diameter ratio (L / D) of the twin-screw extruder is 40:1. Set the temperatures of each heating zone of the extruder as follows: Zone 1 230°C, Zone 2 255°C, Zone 3 265°C, Zone 4 270°C, Zone 5 275°C, and the die head temperature 270°C. Set the screw speed to 350 rpm. The molten blend is extruded from the die head into strips, cooled and shaped in a constant-temperature water bath, and then cut into cylindrical masterbatches with a length of approximately 3 mm by a pelletizer. This masterbatch is a high-efficiency functional masterbatch containing 15% light absorber concentration.

[0046] Example 6: Preparation of a one-piece injection molded light-filtering helmet visor This embodiment provides a light-filtering helmet mask obtained by direct blending and injection molding.

[0047] Step 6.1: The high-efficiency functional masterbatch prepared in Example 5 and pure optical-grade PC resin particles are mixed evenly in a low-speed mixer at a mass ratio of 1:9. The mass percentage of the light absorber (i.e., the sum of polyether-modified organic selective light-absorbing material and nano-titanium oxide) in the mixed raw materials is exactly 1.5%, which falls within the optimal range of 0.1% to 5.0% as defined in the claims.

[0048] Step 6.2: Place the well-mixed raw materials into a dehumidifying drying oven at 120 degrees Celsius and dry for 3 hours.

[0049] Step 6.3: Perform integrated injection molding using a precision injection molding machine with a mask-type cavity. Injection parameters are set as follows: barrel rear section temperature 260°C, middle section temperature 275°C, front section temperature 285°C, nozzle temperature 280°C. Mold temperature is controlled at 90°C to reduce internal stress in the product and improve surface gloss. Injection pressure is set to 85 MPa, holding pressure to 60 MPa, holding time to 8 seconds, and cooling time to 15 seconds.

[0050] Step 6.4: Unmold and eject to obtain a light-filtering helmet visor with a uniform pale yellow transparent appearance and completely homogeneous internal material. This visor can be directly assembled onto a helmet without any subsequent surface coating or film application.

[0051] To fully demonstrate the unexpected technical effects of this invention, the following comparative examples and performance tests are provided.

[0052] Comparative Example 1: Conventional UV-protective transparent face mask The same optical-grade PC resin particles as in Example 6 were used for injection molding, but instead of the composite light absorber powder specific to this invention, only 0.3% of a conventional benzotriazole ultraviolet absorber (UV-326) was added. The injection molding conditions were exactly the same as in Example 6, resulting in a transparent helmet visor.

[0053] Comparative Example 2: Regular blackout dark brown face mask The same optical-grade PC resin granules as in Example 6 were used for injection molding, with 2.0% of conventional carbon black masterbatch added during mixing to reduce overall light transmittance. The injection molding conditions were exactly the same as in Example 6, resulting in a helmet visor with a dark brown color.

[0054] Comparative Example 3: A single inorganic light-absorbing medium mask (used to verify the synergistic effect of the formulation) was prepared using the same process and PC resin particles as in Example 6, but only 1.5% of modified nano-titanium oxide powder was added during mixing, and no polyether-modified organic selective light-absorbing material was added. The injection molding conditions were exactly the same as in Example 6 to obtain the mask.

[0055] To verify the superior performance of the head-wearable device with light filtering function described in this invention in terms of optical selectivity, mechanical durability, and photon whitening protection, the following systematic tests and evaluations were conducted on the samples prepared in the above embodiments (represented by the physical adhesive film of Embodiment 2 and the integrated injection-molded mask of Embodiment 6) and Comparative Examples 1-3.

[0056] Test item 1: Fine-grained test of full-band spectral transmittance; Testing instrument: Shimadzu UV-3600Plus series UV-Vis-NIR spectrophotometer.

[0057] Test conditions: The wavelength scanning range was set to 200.00 nm to 1200.00 nm, the scanning speed was high speed, the slit width was 2.0 nm, the time constant was 1.0 second, and the automatic scanning mode was used. For Example 2, the transmittance (T%) was measured by attaching it to a 2.0 mm thick standard high-transmittance PC test plate; for Example 6 and each comparative example, 2.5 mm thick injection-molded samples were directly used for measurement.

[0058] Data extraction rules: Record the average transmittance of the sample in the 200-505nm band (to evaluate the ability to block black / blue light), the single-point transmittance at 555nm (to evaluate the cutoff point of visual clarity under photopic vision), and the average transmittance in the 560-1200nm band (to evaluate the transmittance of the beneficial phototherapy band).

[0059] Test item two: Mechanical durability and impact resistance test; Coating adhesion test: According to GB / T9286-1998 "Cross-cut test for paint and varnish films", a cross-cut tester is used to score 100 lines on the coating surface, and 3M 600 test tape is used to peel it off. The degree of coating peeling is observed. Grade 0 is the best (no peeling at all), and grade 5 is the worst.

[0060] Surface hardness test: According to GB / T6739-2006 "Determination of hardness of paint film by pencil method", the scratch resistance of the coating or mask surface is determined.

[0061] Drop hammer impact test (for the integrated face shield of Example 6 and the comparative example): In accordance with the provisions of GB811-2022 "Helmet for Motorcycle and Electric Bicycle Riders" regarding the impact resistance performance of goggles, a steel cone with a mass of 3 kg was dropped freely from a height of 1 meter to impact the center of the face shield, and it was observed whether it shattered or was penetrated.

[0062] Table 1: Comprehensive test results of optical and mechanical properties of each embodiment and comparative example

[0063] In-depth data analysis and mechanism exploration: combining the data in Table 1 with Figure 3 From the spectral curves, we can draw the following clear conclusions: First, extreme short-wavelength blocking and high long-wavelength transmittance are achieved synergistically. Examples 2 and 6 show average transmittance of less than 2% in the 200-505nm melanin / aging wavelength range, perfectly blocking ultraviolet light and high-energy short-wavelength blue light. Simultaneously, in the 560-1200nm red / near-infrared phototherapy wavelength range, transmittance reaches over 84%. In contrast, Comparative Example 1 (a conventional UV mask), while blocking UV rays, offers almost no protection against blue light in the 400-505nm range (with a transmittance as high as 78.5%), failing to prevent pigmentation caused by blue light. Comparative Example 2 (a dark brown mask) crudely weakens all wavelengths of light to about 30%, blocking not only blue light but also red light with skin-rejuvenating effects—a traditional, inferior solution that "kills a thousand enemies but loses eight hundred of its own."

[0064] Secondly, the 555nm cutoff point ensures an unparalleled visual experience. The human eye is most sensitive to yellow-green light with a wavelength of 555nm during the day (photopic vision). Examples 2 and 6 precisely control the transmittance at this single wavelength between 40% and 50%. This unique "long-pass steep-cut-off-edge" design makes the light extremely soft and non-glaring when the wearer looks directly at glaring sunlight because blue light is absorbed; at the same time, since nearly half of the green / yellow light is transmitted near 555nm, the overall visual brightness does not suffer from the severe "blindness" seen in Example 2, greatly ensuring the traffic safety of electric vehicle riders entering and exiting tunnels or at dusk.

[0065] Third, the non-obviousness and synergistic effect of the formulation were confirmed. Comparative Example 3 used only nano-titanium oxide, which had a transmittance of up to 22.4% in the 200-505nm range, and its spectral curve showed a slowly decreasing slope, making it impossible to form a steep cutoff at 555nm. This fully demonstrates that the "polyether-modified organic selective light-absorbing material" and "nano-titanium oxide" specified in the examples of this invention are not simply a physical mixture. The two produce a strong synergistic absorption effect in the polyurethane-acrylate interpenetrating network or high-temperature PC melt: the organic light-absorbing material is responsible for "precisely cutting off" short wavelengths, while the inorganic nano-titanium oxide is responsible for broadband diffuse reflection assistance and improving weather resistance. This unexpected technical effect fully demonstrates the outstanding substantive characteristics and significant progress of the formulation combination of this invention.

[0066] Fourth, excellent mechanical support. The surface hardness of the physical bonding film in Example 2 reached 3H, far exceeding the 1H of commercially available ordinary PET film, and its adhesion reached the highest level of 0, completely overcoming the defect of poor scratch resistance of organic light-absorbing films, making the film suitable for long-term outdoor use. The integrated injection-molded face shield in Example 6 perfectly passed the national standard drop hammer impact test, proving that adding composite light-absorbing powder at a ratio of 0.1% to 5.0% will not cause degradation and embrittlement of PC polymer chains, ensuring the helmet's core mechanical protection baseline.

[0067] Clinical translational evaluation of photon whitening and anti-aging: Although this application belongs to the field of physics and materials, its final translational application is directly aimed at human health protection. According to the principle of skin photobiology, when wearing the light filter mask or sun hat provided by this invention and exposed to strong sunlight: (1) blocking the source: the dose of ultraviolet (UVA / UVB) and high-energy blue light received by the facial skin is close to zero. The melanocytes in the epidermis lose the stimulation of blue light signal, and their tyrosinase activity is effectively inhibited, fundamentally blocking the path of tanning and melasma. (2) phototherapy intervention: the high-purity 600-700nm red light and part of the near-infrared light that penetrates the mask can penetrate into the dermis of the skin without obstacles (the penetration depth can reach 2-5mm) and be absorbed by the mitochondria of fibroblasts. By enhancing the activity of cytochrome C oxidase, it promotes the synthesis of adenosine triphosphate (ATP), thereby accelerating the expression of collagen and elastin. Wearing the helmet or sun hat of this invention for daily commuting not only provides robust sun protection but also truly utilizes natural light for passive and non-invasive facial anti-aging and whitening care.

[0068] In summary, this invention innovatively proposes and realizes a light-filtering headwear device with the characteristics of "short-wave cutoff + long-wave high transmittance". It not only perfectly solves the contradiction of "the inability to achieve both light blocking and vision safety" in traditional helmet visors, but also pioneers a technical path for passive photon whitening using a specific solar spectrum range. It has extremely high practical value and broad market prospects.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the core principles of the invention (e.g., changing the specific geometry of the basic light-transmitting component, applying light absorbers to goggles or ski goggles and other headwear, or fine-tuning the copolymerization ratio of polyurethane and acrylate, etc.). These obvious improvements and modifications should all be considered within the scope of protection of the present invention.

Claims

1. A head-wearable device with light filtering function, characterized in that, It includes a light-transmitting base component and a light-filtering medium, wherein the light-filtering medium is attached to the surface of the light-transmitting base component or dispersed inside the light-transmitting base component; after the light-transmitting base component is combined with the light-filtering medium, it can selectively transmit light with wavelengths in the range of 560nm to 1200nm and block light with wavelengths in the range of 200nm to 505nm.

2. The head-wearable device with light filtering function according to claim 1, characterized in that, The light filtering medium is an optical thin film, which is attached to at least one side surface of the light-transmitting base component.

3. The head-wearable device with light filtering function according to claim 1, characterized in that, The light filtering medium is a light absorber, which is mixed into the matrix material of the light-transmitting base component and integrally injection molded with the light-transmitting base component.

4. The head-wearable device with light filtering function according to any one of claims 1 to 3, characterized in that, The head-wearing device is a helmet, and the light-transmitting basic component is a protective face shield located on the front side of the helmet.

5. The head-wearable device with light filtering function according to any one of claims 1 to 3, characterized in that, The headwear device is a sun hat, and the light-transmitting base component is the brim of the sun hat.

6. The head-wearable device with light filtering function according to claim 1, characterized in that, When the light-transmitting base component is combined with the light filtering medium, the transmittance is less than or equal to 5% in the wavelength range of 200nm to 505nm, and the average transmittance is greater than or equal to 80% in the wavelength range of 560nm to 1200nm.

7. The head-wearable device with light filtering function according to claim 2, characterized in that, The optical film is a multi-layer physical adhesive film, which includes, from the inside out: an adhesive layer for attaching to the surface of the light-transmitting base component; an optical base film layer, the material of which is selected from at least one of polyethylene terephthalate, thermoplastic polyurethane elastomer, or polycarbonate; and a selective filtering coating attached to and cured on the outer surface of the optical base film layer.

8. The head-wearable device with light filtering function according to claim 7, characterized in that, The selective light-filtering coating is formed by curing a homogeneous or semi-homogeneous liquid material containing the following components, by mass fraction: 35-55 parts of a polyurethane flexible matrix; 15-25 parts of a polyether-modified organic selective light-absorbing material; 8-15 parts of a nano-titanium oxide dispersed phase; and 10-20 parts of an acrylate-reinforced polyurethane rigid film-forming component. 3-8 parts of polyurethane adhesive additives.

9. The head-wearable device with light filtering function according to claim 3, characterized in that, The matrix material of the light-transmitting base component is selected from at least one of polycarbonate, polymethyl methacrylate or polyester; the light absorber includes polyether-modified organic selective light-absorbing material and nano-titanium oxide, and the mass percentage of the light absorber in the matrix material is 0.1% to 5.0%.

10. The head-wearable device with light filtering function according to claim 1, characterized in that, The light filter medium is configured to block ultraviolet light and high-energy short-wave blue light that cause melanin deposition and photoaging, and to transmit yellow light, red light and near-infrared light that promote collagen production, so as to achieve phototherapy whitening protection for the wearer's face.

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