Coated polarized lens and preparation method thereof

Abstract

The present invention relates to a coated polarized lens and a method for preparing the same. The coated polarized lens comprises a substrate having a hardened layer provided on both the inner and outer surfaces of the substrate. A coating layer and a laser engraving layer are provided, starting from the hardened layer on the outer surface of the substrate and extending outwardly therefrom. The laser engraving layer is laser-engraved in the form of parallel lines. The coated polarized lens provided by the present invention has excellent polarization performance and durability, is applicable to a variety of lens substrates, has a simple production process, reduces manufacturing costs, and can completely replace conventional polarized lenses with PVA polarizing film, or with other protective layers such as TAC, PET, PMMA, and PVA film.

Description

Technical Field

[0001] The present invention belongs to the technical field of lenses, and in particular relates to a coated polarized lens and a preparation method thereof. Background Art

[0002] Polarized lenses are particularly suitable for outdoor activities like fishing, driving, sailing, hunting, and skiing, eliminating some of the annoying glare in everyday life. Many people experience this: in the summer heat, strong sunlight can make it difficult to open your eyes. The glare from smooth roads and building exteriors while driving, the ripples on the water while fishing, the arc light from welding, and the strong reflections from snow can all irritate your eyes, causing discomfort or even temporary blindness.

[0003] Existing polarized lenses on the market achieve their polarization effect by applying a polarizing film to the surface or sandwiching it between the lenses. This process is complex, and some substrates (such as CR39) require adhesives. This results in poor durability and high costs. Furthermore, due to the material properties of traditional polarizing films, when used on substrates with different refractive indices, they can crack due to poor adhesion and large shrinkage ratio differences, making them unsuitable for many frames. Summary of the Invention

[0004] The object of the present invention is to provide a coated polarized lens with good polarization performance, simple process, good durability, and applicability to a wide range of lens substrates.

[0005] In order to achieve the above-mentioned purpose of the present invention, the present invention adopts the following technical solutions:

[0006] The present invention provides a coated polarized lens, comprising a substrate, wherein both inner and outer surfaces of the substrate are provided with a hardening layer, and a coating layer and a laser engraving layer are sequentially provided outward from the hardening layer on the outer surface of the substrate, wherein the laser engraving layer is laser engraved in the shape of parallel lines.

[0007] The coated polarized lens provided by the present invention has a substrate made of a resin lens with a refractive index of 1.499 to 1.74, such as a resin lens with a refractive index of 1.499, 1.5, 1.54, 1.56, 1.58, 1.60, 1.66, 1.68, 1.70 or 1.74, preferably a CR39 resin lens. The scientific name of CR-39 is allyl diglycol carbonate. As an optical lens, the material properties of CR-39 are very suitable: a refractive index of 1.5 (close to that of ordinary glass lenses), a specific gravity of 1.32 (almost half that of glass), an Abbe number of 58 to 59 (with only very little dispersion), impact resistance, high light transmittance, and can be dyed and coated.

[0008] Resin lenses are softer and their wear resistance, corrosion resistance and friction resistance are not as good as glass lenses. The function of the hardening layer is to solidify a layer of hardening liquid on the inner and outer surfaces of the resin lens to form a thermochemical and mechanical protective layer on the inner and outer surfaces of the resin lens, so as to increase the wear resistance, corrosion resistance and friction resistance of the resin lens.

[0009] On the basis of the hardened layer, the present invention deposits one or more materials such as silicon dioxide, metallic chromium, titanium oxide, etc. in multiple layers with different thicknesses on the front side of the hardened resin lens, that is, the outer side of the eyeglass lens, by vacuum sputtering to form a light-shielding coating layer. The coating layer can be designed to be gray or brown. After coating, the transmittance of the lens is between 50% and 85%.

[0010] The gray coating layers include, from the inside to the outside, an 8-20nm metal chromium layer, a 35-45nm silicon dioxide layer, a 60-110nm titanium oxide layer, a 35-45nm silicon dioxide layer, a 100-180nm titanium oxide layer, and a 60-100nm silicon dioxide layer; the brown coating layers include, from the inside to the outside, a 20-40nm metal chromium layer, a 5-15nm silicon dioxide layer, a 20-40nm metal chromium layer, a 5-15nm silicon dioxide layer, a 20-40nm metal chromium layer, a 5-15nm silicon dioxide layer, a 20-40nm metal chromium layer, and a 60-100nm silicon dioxide layer.

[0011] When the coating layer is a gray coating layer, the method for preparing the coated polarized lens includes the following steps:

[0012] (1) Hardening: Take a substrate and spray or dip hardening liquid onto the inner and outer surfaces of the substrate to obtain a hardened substrate;

[0013] (2) Coating: Taking a hardened substrate, depositing an 8-20 nm metal chromium layer, a 35-45 nm silicon dioxide layer, a 60-110 nm titanium oxide layer, a 35-45 nm silicon dioxide layer, a 100-180 nm titanium oxide layer, and a 60-100 nm silicon dioxide layer on the outer surface of the hardened substrate in sequence by vacuum sputtering to obtain a coated hardened substrate;

[0014] (3) Engraving: a. Design the engraving pattern to be a parallel line pattern; b. Suspend the coated hardened substrate on a workbench to ensure heat dissipation, adjust the focal length and process parameters of the molecular laser so that the focus is located on the coated side of the hardened substrate, and set the following process parameters: power range 3-20W, laser is continuous laser or pulsed laser, and the peak power does not exceed 20W when the laser is a pulsed laser, speed 350mm / s-500mm / s, light on delay 200mm-100mm, light off delay 100mm-300mm; c. Use a laser to engrave the designed engraving pattern onto the coated side of the hardened substrate to obtain the coated polarized lens.

[0015] When the coating layer is a brown coating layer, the method for preparing the coated polarized lens includes the following steps:

[0016] (1) Hardening: Take a substrate and spray or dip hardening liquid onto the inner and outer surfaces of the substrate to obtain a hardened substrate;

[0017] (2) Coating: A hardened substrate is taken and a 20-40 nm metal chromium layer, a 5-15 nm silicon dioxide layer, a 20-40 nm metal chromium layer, a 5-15 nm silicon dioxide layer, a 20-40 nm metal chromium layer, a 5-15 nm silicon dioxide layer, a 20-40 nm metal chromium layer, a 5-15 nm silicon dioxide layer, a 20-40 nm metal chromium layer, and a 60-100 nm silicon dioxide layer are sequentially deposited on the outer surface of the hardened substrate by vacuum sputtering to obtain a coated hardened substrate;

[0018] (3) Engraving: a. Design the engraving pattern to be a parallel line pattern; b. Suspend the coated hardened substrate on a workbench to ensure heat dissipation, adjust the focal length and process parameters of the molecular laser so that the focus is located on the coated side of the hardened substrate, and set the following process parameters: power range 3-20W, laser is continuous laser or pulsed laser, and the peak power does not exceed 20W when the laser is a pulsed laser, speed 350mm / s-500mm / s, light on delay 200mm-100mm, light off delay 100mm-300mm; c. Use a laser to engrave the designed engraving pattern onto the coated side of the hardened substrate to obtain the coated polarized lens.

[0019] In the preparation method provided by the present invention, the hardening liquid is selected from any one of SDC's MP7110 (refractive index 1.50), C415 (refractive index 1.60), and MP1670 (refractive index 1.67), and the refractive index of the hardening liquid must be the same as the refractive index of the substrate.

[0020] The beneficial effects of the present invention are:

[0021] The coated polarized lenses provided by the present invention incorporate a laser-engraved layer on the surface of the coating layer. This laser-engraved layer consists of parallel lines, equivalent to very fine grids. This design, similar to the principle of dense Venetian blinds, blocks harsh and irregular scattered light from the environment. Only light parallel to the "blind slits" can pass through and enter the eye, avoiding the glare effect of strong light and making the light perceived by the eye softer and clearer, thereby achieving a polarization effect. The lenses provided by the present invention have excellent polarization performance and durability, are applicable to a variety of lens substrates, and have a simple production process, reducing manufacturing costs. They can completely replace traditional polarized lenses with PVA polarizing film, or with other protective layers such as TAC, PET, PMMA, and PVA film. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 : carving pattern;

[0023] Figure 2 : The transmission data of Example 1 after coating was measured using a spectrophotometer;

[0024] Figure 3 : The reflectance data after coating of Example 1 was measured using a spectrophotometer;

[0025] Figure 4 : The reflectance data of Example 4 after coating was measured using a spectrophotometer;

[0026] Figure 5 : The transmission data of Example 4 after coating was measured using a spectrophotometer;

[0027] Figure 6 : The transmission data of Example 2 after coating was measured using a spectrophotometer;

[0028] Figure 7 : The reflectance data after coating of Example 2 was measured using a spectrophotometer;

[0029] Figure 8 : The transmission data of Example 3 after coating was measured using a spectrophotometer;

[0030] Figure 9 : The reflectance data after coating of Example 3 was measured using a spectrophotometer;

[0031] Figure 10 : The reflectance data of Example 5 after coating was measured using a spectrophotometer;

[0032] Figure 11 : The transmission data of Example 5 after coating was measured using a spectrophotometer;

[0033] Figure 12 : The transmission data of Example 6 after coating was measured using a spectrophotometer;

[0034] Figure 13 : The reflection data of Example 6 after coating was measured using a spectrophotometer. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] This embodiment provides a coated polarized lens, including a CR39 resin lens. A hardened layer is provided on both the inner and outer surfaces of the CR39 resin lens. A gray coating layer and a laser engraving layer are provided in this order, starting from the hardened layer on the outer surface of the CR39 resin lens and extending outward. The laser engraving layer is laser-engraved in the form of parallel lines.

[0038] The method for preparing the coated polarized lens comprises the following steps:

[0039] (1) Hardening: Soak the CR39 resin lens in SDC's MP7110 (refractive index 1.50) hardening solution at a temperature of 15±2°C. After soaking for 3-5 seconds, pull the lens at a speed of 2 mm / s. After pulling, bake at 110°C for 3 hours to solidify the lens, thereby obtaining a hardened substrate.

[0040] (2) Coating: Take a hardened substrate and deposit an 18nm metal chromium layer, a 40nm silicon dioxide layer, a 95nm titanium oxide layer, a 40nm silicon dioxide layer, a 160nm titanium oxide layer, and an 85nm silicon dioxide layer on the outer surface of the hardened substrate in sequence by vacuum sputtering. The coated hardened substrate is obtained. The surface film is dark gray and is named Greycool85. The reflection and transmission data after coating are measured by a spectrophotometer. Figures 2-3 ;

[0041] (3) Carving: a. The design of the carving pattern is a parallel line shape pattern, see Figure 1 , the pen width is set to 20nm, and the interval width is 20nm; b. Place the coated hardened substrate on a workbench in the air, adjust the focal length and process parameters of the molecular laser so that the focus is located on the coated side of the hardened substrate, and set the following process parameters: power 3W, laser is continuous laser, speed 350mm / s, light on delay 200mm, light off delay 100mm; c. Use a laser to engrave the designed engraving pattern on the coated side of the hardened substrate to obtain the coated polarized lens.

[0042] Example 2

[0043] The only difference from Example 1 is that in step (2), a hardened substrate is taken, and a 12nm metal chromium layer, a 40nm silicon dioxide layer, a 70nm titanium oxide layer, a 40nm silicon dioxide layer, a 115nm titanium oxide layer, and an 85nm silicon dioxide layer are deposited on the outer surface of the hardened substrate in sequence by vacuum sputtering to obtain a coated hardened substrate. The surface film layer is dark gray and is named Greycool75. The reflection and transmission data after coating are measured by a spectrophotometer. Figures 6-7 .

[0044] Example 3

[0045] The only difference from Example 1 is that in step (2), a hardened substrate is taken, and an 8nm metal chromium layer, a 35nm silicon dioxide layer, a 60nm titanium oxide layer, a 35nm silicon dioxide layer, a 100nm titanium oxide layer, and a 70nm silicon dioxide layer are sequentially deposited on the outer surface of the hardened substrate by vacuum sputtering to obtain a coated hardened substrate. The surface film layer is dark gray and is named Greycool50. The reflection and transmission data after coating are measured by a spectrophotometer. Figures 8-9 .

[0046] Example 4

[0047] This embodiment provides a coated polarized lens, including a CR39 resin lens, wherein both the inner and outer surfaces of the CR39 resin lens are provided with a hardened layer, and a brown coating layer and a laser engraving layer are provided in order from the hardened layer on the outer surface of the CR39 resin lens outward, wherein the laser engraving layer is laser-engraved in the form of parallel lines;

[0048] The method for preparing the coated polarized lens comprises the following steps:

[0049] (1) Hardening: Soak the CR39 resin lens in SDC's MP7110 (refractive index 1.50) hardening solution at a temperature of 15±2°C. After soaking for 3-5 seconds, pull the lens at a speed of 2 mm / s. After pulling, bake at 110°C for 3 hours to solidify the lens, thereby obtaining a hardened substrate.

[0050] (2) Coating: Take a hardened substrate and deposit a 38.5nm metal chromium layer, a 13nm silicon dioxide layer, a 30nm metal chromium layer, a 13nm silicon dioxide layer, a 30nm metal chromium layer, a 13nm silicon dioxide layer, a 30nm metal chromium layer, a 13nm silicon dioxide layer, a 30nm metal chromium layer, and a 90nm silicon dioxide layer on the outer surface of the hardened substrate in sequence by vacuum sputtering. The coated hardened substrate is obtained. The surface film is dark brown and is named brown85. The reflection and transmission data after coating are measured by a spectrophotometer. Figures 4-5 ;

[0051] (3) Carving: a. The design of the carving pattern is a parallel line shape pattern, see Figure 1 , the pen width is set to 40μm, and the interval width is 40μm; b. Place the coated hardened substrate on a workbench in the air, adjust the focal length and process parameters of the molecular laser so that the focus is located on the coated side of the hardened substrate, and set the following process parameters: power 20W, laser is pulsed laser, speed 500mm / s, light on delay 100mm, light off delay 300mm; c. Use a laser to engrave the designed engraving pattern on the coated side of the hardened substrate to obtain the coated polarized lens.

[0052] Example 5

[0053] The only difference from Example 4 is that in step (2), a hardened substrate is taken, and a 35nm metal chromium layer, a 12nm silicon dioxide layer, a 28nm metal chromium layer, a 12nm silicon dioxide layer, a 28nm metal chromium layer, a 12nm silicon dioxide layer, a 28nm metal chromium layer, a 12nm silicon dioxide layer, a 28nm metal chromium layer, and a 90nm silicon dioxide layer are deposited on the outer surface of the hardened substrate in sequence by vacuum sputtering to obtain a coated hardened substrate. The surface film layer is dark brown and is named brown75. The reflection and transmission data after coating are measured by a spectrophotometer. Figure 10-11 .

[0054] Example 6

[0055] The only difference from Example 4 is that in step (2), a hardened substrate is taken, and a 20nm metal chromium layer, a 10nm silicon dioxide layer, a 20nm metal chromium layer, a 10nm silicon dioxide layer, a 20nm metal chromium layer, a 10nm silicon dioxide layer, a 20nm metal chromium layer, a 10nm silicon dioxide layer, a 20nm metal chromium layer, and a 70nm silicon dioxide layer are deposited on the outer surface of the hardened substrate in sequence by vacuum sputtering to obtain a coated hardened substrate. The surface film layer is dark brown and is named brown50. The reflection and transmission data after coating are measured by a spectrophotometer. Figure 12-13 .

[0056] The polarization effect of the lenses in the above embodiments was tested using the following formula using a transmittance tester.

[0057] Polarization calculation formula: P = (((T + T`) 2 -4×T ⊥ ) 1 / 2 ) / (T+T`)

[0058] T: The axis of the single lens is perpendicular to the horizontal direction

[0059] T`: The axis of the single lens is parallel to the horizontal direction

[0060] T ⊥ :The two lens axes are perpendicular to each other

[0061]

[0062] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A coated polarized lens, characterized in that: The invention comprises a substrate, wherein both inner and outer surfaces of the substrate are provided with a hardening layer, and a coating layer and a laser engraving layer are provided outward from the hardening layer on the outer surface of the substrate. The coating layer comprises, from the inner to the outer surface, an 8-20nm metal chromium layer, a 35-45nm silicon dioxide layer, a 60-110nm titanium oxide layer, a 35-45nm silicon dioxide layer, a 100-180nm titanium oxide layer, and a 60-100nm silicon dioxide layer. The laser engraving layer is laser-engraved in the shape of parallel lines. The pen width of the parallel line-shaped laser engraving is 20nm, and the interval width is 20nm. Alternatively, the coating layer includes, from the inside to the outside, a 20-40nm metal chromium layer, a 5-15nm silicon dioxide layer, a 20-40nm metal chromium layer, a 5-15nm silicon dioxide layer, a 20-40nm metal chromium layer, a 5-15nm silicon dioxide layer, a 20-40nm metal chromium layer, and a 60-100nm silicon dioxide layer.

2. The coated polarized lens according to claim 1, characterized in that: The substrate is a resin lens with a refractive index of 1.499 to 1.

74.

3. The coated polarized lens according to claim 2, characterized in that: The substrate is a CR39 resin lens.

4. The method for preparing the coated polarized lens according to claim 1, characterized in that: The steps include: (1) Hardening: Take the substrate and spray or dip the hardening liquid onto the inner and outer surfaces of the substrate to obtain a hardened substrate; (2) Coating: Take a hardened substrate and deposit an 8-20 nm metal chromium layer, a 35-45 nm silicon dioxide layer, a 60-110 nm titanium oxide layer, a 35-45 nm silicon dioxide layer, a 100-180 nm titanium oxide layer, and a 60-100 nm silicon dioxide layer on the outer surface of the hardened substrate in sequence by vacuum sputtering to obtain a coated hardened substrate; (3) Engraving: a. Design the engraving pattern to be a parallel line pattern; b. Place the coated hardened substrate in the air on a workbench, adjust the focal length and process parameters of the molecular laser so that the focus is on the coated side of the hardened substrate, and set the following process parameters: power range 3-20W, laser is continuous laser or pulsed laser, and the peak power does not exceed 20W when the laser is a pulsed laser, speed 350mm / s-500mm / s, light on delay 200mm-100mm, light off delay 100mm-300mm; c. Use a laser to engrave the designed engraving pattern onto the coated side of the hardened substrate, thereby obtaining the coated polarized lens; Alternatively, the method for preparing the coated polarized lens comprises the following steps: (1) Hardening: Take the substrate and spray or dip the hardening liquid onto the inner and outer surfaces of the substrate to obtain a hardened substrate; (2) Coating: Take a hardened substrate and deposit a 20-40 nm metal chromium layer, a 5-15 nm silicon dioxide layer, a 20-40 nm metal chromium layer, a 5-15 nm silicon dioxide layer, a 20-40 nm metal chromium layer, a 5-15 nm silicon dioxide layer, a 20-40 nm metal chromium layer, a 5-15 nm silicon dioxide layer, a 20-40 nm metal chromium layer, and a 60-100 nm silicon dioxide layer on the outer surface of the hardened substrate by vacuum sputtering to obtain a coated hardened substrate; (3) Engraving: a. Design the engraving pattern to be a parallel line pattern; b. Place the coated hardened substrate in the air on a workbench, adjust the focal length and process parameters of the molecular laser so that the focus is on the coated side of the hardened substrate, and set the following process parameters: power range 3-20W, laser is continuous laser or pulsed laser, and the peak power does not exceed 20W when the laser is a pulsed laser, speed 350mm / s-500mm / s, light on delay 200mm-100mm, light off delay 100mm-300mm; c. Use a laser to engrave the designed engraving pattern onto the coated side of the hardened substrate to obtain the coated polarized lens.

5. The method for preparing a coated polarized lens according to claim 4, characterized in that: The hardening liquid is selected from any one of MP7110, C415, and MP1670 produced by SDC, and the refractive index of the hardening liquid is the same as that of the substrate.

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