A film layer for improving the discoloration performance of a photochromic sheet

Abstract

The application discloses a film layer for improving the discoloring performance of a photochromic discoloring lens, which is arranged on the surface of the discoloring lens; the film layer comprises a multilayer structure which is stacked in sequence from the surface of the discoloring lens outward, wherein the first layer to the fifth layer of the multilayer structure are a first low-refractive silicon material layer, a first high-refractive zirconium-titanium material mixed layer, a second low-refractive silicon material layer, a first high-refractive titanium material layer and a third low-refractive silicon material layer in sequence; the optical thickness of the ith layer is δi i , and the physical film thickness is d i ; the material of the first high-refractive zirconium-titanium material mixed layer is a mixture of ZrO2 and TiO2 or a mixture of ZrO2 and Ti3O5, the optical thickness of the layer is 0.1641+1.6946<δ2<0.27+2.3246, and the physical film thickness d2 is 12+111nm<d2<19.74+152.27nm. The film layer has relatively strong transmittance in the wave range of 350-420nm, maintains the original color system in the visible light wave range, and enhances the ultraviolet transmittance, so that the discoloring layer can absorb more ultraviolet rays, thereby effectively starting the discoloring performance of the lens discoloring layer and enhancing the discoloring performance.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and in particular to a film layer for improving the color-changing performance of photochromic lenses. Background Technology

[0002] Photochromic lenses, also known as "photosensitive lenses," are based on the principle of reversible light color change. Under light and ultraviolet radiation, the lenses quickly darken, blocking strong light and absorbing ultraviolet rays, while exhibiting neutral absorption of visible light. When exposed to darkness, they quickly return to a colorless and transparent state, ensuring the lens's light transmittance. Therefore, photochromic lenses are suitable for both indoor and outdoor use, preventing damage to the eyes from sunlight, ultraviolet light, and glare.

[0003] Traditional optical films on the market have high reflectivity in the near-ultraviolet band of 360nm to 380nm, reflecting most ultraviolet light (traditional sunglasses coatings generally do not consider the transmission of light outside the visible spectrum). Therefore, coating traditional optical films on photochromic lenses that require a 360nm to 380nm threshold for activation will result in significant light loss. This will prevent the photochromic lens from absorbing more ultraviolet light, leading to a decrease in the photochromic performance or even rendering the photochromic function ineffective. Summary of the Invention

[0004] The purpose of this invention is to provide a film layer that improves the color-changing performance of photochromic sheets. This film system has strong transmittance in the 350-420nm wavelength range and maintains the original color system in the visible light band.

[0005] To achieve the above objectives, the solution of the present invention is: a film layer for improving the photochromic performance of photochromic lenses, wherein the film layer is disposed on the surface of the photochromic lens;

[0006] The film layer includes a multilayer structure stacked sequentially from the surface of the photochromic lens outwards. The first to fifth layers of the multilayer structure are, in sequence, a first low-refractive-index silicon material layer, a first high-refractive-index zirconium-titanium material hybrid layer, a second low-refractive-index silicon material layer, a first high-refractive-index titanium material layer, and a third low-refractive-index silicon material layer.

[0007] Let the optical thickness of the i-th layer be δ. i The physical film thickness is d i The first high-refractive-index zirconium-titanium hybrid layer is a mixture of ZrO2 and TiO2 or a mixture of ZrO2 and Ti3O5. The optical thickness δ2 of this layer is 0.1641+1.6946<δ2<0.27+2.3246, and the physical film thickness d2 is 12+111nm<d2<19.74+152.27nm.

[0008] It also includes a sixth layer, which is a protective layer with waterproof and oil-proof properties.

[0009] Furthermore, the material of the first low-refractive-index silicon material layer is SiO, and the optical thickness δ1 of the layer is 0.0698 < δ1 < 0.0708, and the physical film thickness d1 is 6.0 nm < d1 < 6.086 nm.

[0010] Furthermore, the material of the second low-refractive-index silicon material layer is SiO2, and the optical thickness δ3 of this layer is 1.0 < δ3 < 1.44, and the physical film thickness d3 is 96 nm < d3 < 137.39 nm.

[0011] Furthermore, the material of the first high-refractive-index titanium material layer is TiO2 or Ti3O5, and the optical thickness δ4 of the layer is 0.3 < δ4 < 0.6, and the physical film thickness d4 is 19.59 nm < d4 < 39.12 nm.

[0012] Furthermore, the material of the third low-refractive-index silicon material layer is SiO2, and the optical thickness δ5 of this layer is 1.8549 < δ5 < 2.260, and the physical film thickness d5 is 176.89 nm < d5 < 215.5 nm.

[0013] Furthermore, the physical film thickness d6 of the protective layer is 3.0 nm < d6 < 7.0 nm.

[0014] The beneficial effects of the present invention after adopting the above scheme are as follows: the film layer includes a first low-refractive-index silicon material layer, a first high-refractive-index zirconium-titanium material hybrid layer, a second low-refractive-index silicon material layer, a first high-refractive-index titanium material layer, and a third low-refractive-index silicon material layer, which are stacked sequentially from near the surface of the photochromic lens to away from the lens surface. The first high-refractive-index zirconium-titanium material hybrid layer is a mixture of ZrO2 and TiO2 or a mixture of ZrO2 and Ti3O5, and the optical thickness of this layer is 0.16. 41+1.6946<δ2<0.27+2.3246, the physical film thickness d2 is 12+111nm<d2<19.74+152.27nm. The design of this hybrid layer makes the reflectivity of the film system almost 0 for wavelengths of 360~380nm, and the film layer has strong transmittance in the 350~420nm wavelength range. It maintains the original color system in the visible light band and enhances ultraviolet transmittance, so that the photochromic layer can absorb more ultraviolet rays, thereby effectively activating the photochromic performance of the lens photochromic layer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the layered structure of the membrane layer of the present invention;

[0016] Figure 2 This is a schematic diagram of the layered structure of the film layer and the structure of the photochromic lens of the present invention;

[0017] Figure 3This is a spectral reflectance curve of a conventional high-refractive-index titanium material without a mixed-layer film.

[0018] Figure 4 This is a graph of the spectral reflectance characteristics of the film layer of the present invention (I);

[0019] Figure 5 This is the second graph showing the spectral reflectance characteristics of the film layer of the present invention.

[0020] Label Explanation:

[0021] 1. First low-refractive-index silicon material layer; 2. First high-refractive-index zirconium-titanium hybrid layer; 3. Second low-refractive-index silicon material layer; 4. First high-refractive-index titanium material layer; 5. Third low-refractive-index silicon material layer; 6. Protective layer; 7. Photochromic lens; 8. Air. Detailed Implementation

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides a coating layer for improving the photochromic performance of photochromic lenses. Photochromic lenses are generally divided into substrate photochromic lenses and coating photochromic lenses. Substrate photochromic lenses have silver halide added to the lens substrate. Utilizing the ionic reaction of silver halide, it decomposes into silver and halogens under strong light, coloring the lens. When the light weakens, they recombine to form silver halide, lightening the color. Coating photochromic lenses, on the other hand, undergo special treatment during the lens coating process. For example, spiropyran compounds are used and spin-coated at high speed onto the lens surface. Depending on the intensity of light and ultraviolet radiation, the molecular structure reverses its opening and closing to achieve the effect of allowing or blocking light.

[0024] Lens substrates can be made from materials such as PC, TAC, and PA. Among them, PC is polycarbonate, a thermoplastic material, which is lightweight and safe; TAC is cellulose triacetate, a thermoplastic plastic with a light transmittance of 93% and a density of 1.23-1.34; PA has physical properties such as impact resistance and deformation resistance.

[0025] A new type of film is applied to the surface of the photochromic lens 7, enabling the photochromic lens 7 to absorb more ultraviolet rays without affecting its photochromic performance.

[0026] like Figure 1 As shown, the film layer includes a multilayer structure stacked sequentially from the surface of the photochromic lens 7 outwards. The first to fifth layers of the multilayer structure are, in sequence, a first low-refractive-index silicon material layer 1, a first high-refractive-index zirconium-titanium material hybrid layer 2, a second low-refractive-index silicon material layer 3, a first high-refractive-index titanium material layer 4, a third low-refractive-index silicon material layer 5, and a sixth protective layer 6.

[0027] In this case, the optical thickness of the i-th layer is set to δ.i The physical film thickness is d i .

[0028] The first low-refractive-index silicon material layer 1 is made of SiO. The optical thickness δ1 of this layer is 0.0698 < δ1 < 0.0708, and the physical film thickness d1 is 6.0 nm < d1 < 6.086 nm.

[0029] The first high-refractive-index zirconium-titanium hybrid layer 2 is a mixture of ZrO2 and TiO2 or a mixture of ZrO2 and Ti3O5. The optical thickness of this layer is 0.1641+1.6946<δ2<0.27+2.3246, and the physical film thickness d2 is 12+111nm<d2<19.74+152.27nm.

[0030] The material of the second low-refractive-index silicon material layer 3 is SiO2. The optical thickness δ3 of this layer is 1.0 < δ3 < 1.44, and the physical film thickness d3 is 96 nm < d3 < 137.39 nm.

[0031] The first high-refractive-index titanium material layer 4 is made of TiO2 or Ti3O5. The optical thickness δ4 of this layer is 0.3 < δ4 < 0.6, and the physical film thickness d4 is 19.59 nm < d4 < 39.12 nm.

[0032] The third low-refractive-index silicon material layer 5 is made of SiO2. The optical thickness δ5 of this layer is 1.8549 < δ5 < 2.260, and the physical film thickness d5 is 176.89 nm < d5 < 215.5 nm.

[0033] It also includes a sixth layer, which is a protective layer 6 with waterproof and oil-proof properties, and the physical film thickness d6 of the protective layer 6 is 3.0nm < d6 < 7.0nm.

[0034] The data for each layer of material are shown in the table below:

[0035] Table 1

[0036]

[0037]

[0038] Titanium pentoxide (Ti3O5) among the above materials is a high-refractive-index optical material with the characteristics of low resistance, strong adhesion, not easy to sputter, and good optical surface finish after film formation.

[0039] The membrane system in this case was manufactured using the following method:

[0040] By N i d i =1 / 4λ0(Qwot)

[0041] Where Qwot (quarter-wave optical thickness) is 1 / 4 of the optical thickness of each layer of material; N i Let d be the refractive index of the i-th film layer material. i λ is the physical thickness of the i-th film layer, and λ0 is the reference wavelength.

[0042] To ensure good light transmission in the 360nm–380nm wavelength range, it is necessary to control the optical film thickness of each layer of material. In fact, this is achieved by controlling the phase difference between the reflection (A) formed at the interface between the light beam passing through the air 8 and the protective layer 6, the high refractive index layer and the low refractive index layer, and each layer and the photochromic lens, and the light beam (B) that, after further transmission, forms a reflected light at the next interface, passes through the film layer, and re-enters the air 8.

[0043] Since B travels a distance d more than A, the optical thickness is the physical thickness multiplied by the refractive index of the medium, i.e., d*n. When d*n = an odd multiple of (1 / 4)λ, B and A are coherent beams. One-quarter optical thickness (Qwot) is (1 / 4)λ, where λ is the wavelength of the beam.

[0044] The conditions are set using the membrane system software TFCalc, and the built-in function automatically optimizes d. i The value is used to achieve destructive interference in the 360nm to 380nm wavelength range, so that the spectral characteristics can meet the product requirements.

[0045] A first layer of low-refractive-index silicon monoxide is deposited on the surface of the photochromic lens 7. The disproportionation reaction of silicon monoxide during vapor condensation allows the photochromic lens 7 to bond better with the first high-refractive-index zirconium-titanium hybrid material layer, which can ensure the adhesion of subsequent optical film stacks and prevent them from falling off.

[0046] Through the rational design of optical and physical film thickness, the second to fourth layers enable the film to increase ultraviolet transmittance while effectively filtering out infrared and blue light, thereby maximizing the elimination of harmful light and effectively preventing the occurrence of eye diseases.

[0047] The sixth layer is a protective layer, which can be made of materials with waterproof and oil-proof properties, such as SH-HT waterproof coating (SuperHydrophobic Tablet). The waterproof coating can greatly improve the stability, scratch resistance, mechanical properties and waterproof performance of the coating system, making it difficult for the lens to adhere to stains, oil and dust, and making it very easy to clean. This reduces lens wear, maintains good light transmission and extends service life.

[0048] This project incorporates the narrow-bandpass design concept of optical filters into the photochromic lens coating process, using the photochromic lens as a substrate and performing vacuum evaporation. The process involves sequentially depositing and crystallizing low-refractive-index silicon as a bonding layer, followed by alternating deposition of high-refractive-index and low-refractive-index materials to form thin-film optical layers. The thin-film layers begin with a random lattice pattern, then form island structures, which then connect to form sheet structures, and finally accumulate into a columnar thin-film structure. This type of coating process, by combining materials with various refractive indices, facilitates the easier elimination of stray light in the film system design.

[0049] Figures 3 to 5 This is a graph showing the spectral reflectance characteristics. The horizontal axis represents wavelength, and the vertical axis represents reflectance.

[0050] like Figure 3 As shown, in conventional high-refractive-index titanium materials without a mixed layer design, the film layer exhibits high reflectivity in the 360nm–380nm ultraviolet band, and the resulting loss is difficult to eliminate. However, after incorporating a mixed-layer design with high-refractive-index zirconium-titanium, as... Figure 4 As shown, the film system has very low reflectivity for wavelengths of 360–380 nm, almost zero, effectively solving the aforementioned problem. The newly designed film system, through spectral analysis and optimization of the refractive index of the coating material, incorporates the theory of narrow bandpass in optical communication design to create a 360–380 nm bandpass, effectively activating the photochromic function of the lens's photochromic layer.

[0051] Therefore, as Figure 5 As shown, the novel film layer formed by the composite structure of the above layers has strong transmittance in the 350-420nm wavelength range, and maintains its original color system in the visible light band. The ultraviolet transmittance is enhanced, which allows the photochromic layer of the lens to absorb more ultraviolet rays, thereby effectively activating the photochromic performance of the lens photochromic layer and enhancing the photochromic performance.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. All equivalent changes made based on the key design features of this case shall fall within the protection scope of this case.

Claims

1. A film layer for improving the color-changing performance of photochromic sheets, characterized in that: The film layer is disposed on the surface of the photochromic lens; The film layer includes a multilayer structure stacked sequentially from the surface of the photochromic lens outwards. The first to fifth layers of the multilayer structure are, in sequence, a first low-refractive-index silicon material layer, a first high-refractive-index zirconium-titanium material hybrid layer, a second low-refractive-index silicon material layer, a first high-refractive-index titanium material layer, and a third low-refractive-index silicon material layer. Let the optical thickness of the i-th layer be δ. i Optical thickness δ i The Qwot value corresponds to the film layer, and the physical film thickness is d. i The first low-refractive-index silicon material layer is made of SiO, and the optical thickness δ1 of this layer is 0.0698 < δ1 < 0.0708, and the physical film thickness d1 is 6.0 nm < d1 < 6.086 nm. The first high-refractive-index zirconium-titanium hybrid layer is a mixture of ZrO2 and TiO2 or a mixture of ZrO2 and Ti3O5. The optical thickness δ2 of this layer is 1.8587 < δ2 < 2.5946, and the physical film thickness d2 is 123 nm < d2 < 172.01 nm. The material of the second low-refractive-index silicon material layer is SiO2, and the optical thickness δ3 of this layer is 1.0 < δ3 < 1.44, and the physical film thickness d3 is 96 nm < d3 < 137.39 nm. The first high-refractive-index titanium material layer is made of TiO2 or Ti3O5, and the optical thickness δ4 of this layer is 0.3 < δ4 < 0.6, and the physical film thickness d4 is 19.59 nm < d4 < 39.12 nm. The material of the third low-refractive-index silicon material layer is SiO2. The optical thickness δ5 of this layer is 1.8549 < δ5 < 2.260, and the physical film thickness d5 is 176.89 nm < d5 < 215.5 nm. It also includes a sixth layer, which is a protective layer with waterproof and oil-proof properties.

2. The film layer for improving the color-changing performance of photochromic sheets as described in claim 1, characterized in that: The physical film thickness d6 of the protective layer is 3.0 < d6 < 7.0 nm.

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