Anti-reflective mirror lens against near infrared laser

Abstract

This invention discloses an anti-reflective lens for near-infrared laser protection, comprising a substrate layer. Both the upper and lower surfaces of the substrate layer are provided with hardening layers. The surface of the hardening layers is coated with a multi-layered high-reflectivity near-infrared anti-reflective film. The high-reflectivity near-infrared anti-reflective film comprises 12 layers: a first silicon dioxide layer, a first silicon nitride layer, a second silicon dioxide layer, a first titanium oxide layer, a third silicon dioxide layer, a second silicon nitride layer, a fourth silicon dioxide layer, a second titanium oxide layer, a fifth silicon dioxide layer, a third silicon nitride layer, a sixth silicon dioxide layer, and a third titanium oxide layer. An indium oxide layer, a seventh silicon dioxide layer, and a waterproof membrane layer are also deposited on the high-reflectivity near-infrared anti-reflective film. This invention can significantly improve the reflectivity of the near-infrared spectrum, thereby reducing the transmittance of near-infrared lasers and reducing the damage of near-infrared light to the eyes, while having almost no impact on the transmittance of visible light.

Description

Technical Field

[0001] This utility model relates to the field of resin lens technology, specifically to an anti-reflective lens that protects against near-infrared lasers. Background Technology

[0002] Near-infrared (NIR) radiation is electromagnetic radiation with wavelengths longer than red light within a certain range. As a type of high-energy thermal radiation, NIR radiation causes objects to heat up rapidly, and its damage to the eyes is particularly severe. The harmful effects of NIR radiation on the human eye are often overlooked. Short-wave infrared radiation with wavelengths between 780nm and 2000nm penetrates tissues most deeply, reaching a depth of up to 10mm. It can directly affect blood vessels, lymphatic vessels, nerve endings, and other subcutaneous tissues. Repeated exposure to high doses of infrared radiation can cause brown, marble-like pigmentation, which is related to the increased pigmentation of melanocytes in the basal cell layer of blood vessel walls due to thermal effects. In particular, NIR radiation is absorbed by the iris and lens of the eye, leading to eye damage and decreased vision. Because the eyeball contains a large amount of fluid, it absorbs NIR radiation strongly; therefore, direct exposure to the eyes can cause cataracts. The formation of cataracts is related to the effects of short-wave infrared radiation.

[0003] The mainstream lens coating technology currently is anti-reflective coating, also known as a low-reflection coating or anti-reflection coating. It primarily treats light as a wave and utilizes the interference properties of waves. When a thin film of appropriate thickness is coated on the lens surface, the reflected light from both sides of the film differs by half a wavelength. Due to interference, these differences cancel each other out, thus reducing light reflection and increasing light transmittance. Typically, anti-reflective coatings only consider the transmittance of visible light in the 400-780nm range, reducing reflection in this range to increase visible light transmittance and make the lens brighter. Furthermore, due to the different colors of the reflected light, lens coatings are also classified as green, blue, yellow-green, etc. Existing lens coatings have a visible light reflectance of approximately 2% in the 400-780nm range and generally do not consider the reflection of other wavelengths. Other wavelengths, particularly those in the near-infrared band above 780nm, typically have a reflectivity of only about 10%. This means that, without considering material absorption, approximately 90% of the near-infrared light will pass through the lens and radiate into the eyes. Therefore, an anti-reflective lens to protect against near-infrared lasers needs to be designed. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an anti-reflective lens for protecting against near-infrared lasers.

[0005] An anti-reflective lens for near-infrared laser protection includes a substrate layer. A hardening layer is disposed on both the upper and lower surfaces of the substrate layer. The surface of the hardening layer is coated with a multi-layered high-reflectivity near-infrared anti-reflective film. The high-reflectivity near-infrared anti-reflective film comprises 12 layers: a first silicon dioxide layer, a first silicon nitride layer, a second silicon dioxide layer, a first titanium oxide layer, a third silicon dioxide layer, a second silicon nitride layer, a fourth silicon dioxide layer, a second titanium oxide layer, a fifth silicon dioxide layer, a third silicon nitride layer, a sixth silicon dioxide layer, and a third titanium oxide layer. An indium oxide layer, a seventh silicon dioxide layer, and a waterproof membrane layer are also deposited on the high-reflectivity near-infrared anti-reflective film.

[0006] Furthermore, the thickness of the hardening layer is 5±0.5μm, and the thicknesses of the multilayer structure of the high-reflectivity near-infrared antireflective film are sequentially 152-166nm, 10-15nm, 33-38nm, 45-51nm, 110-123nm, 15-22nm, 43-47nm, 25-28nm, 87-95nm, 22-30nm, 46-52nm, and 55-60nm; the thickness of the indium oxide layer is 6±1nm; and the thicknesses of the seventh silicon dioxide layer and the waterproof membrane layer are 86-105nm and 30±5nm, respectively.

[0007] Furthermore, the substrate layer is cured and molded from a transparent resin, which includes acrylic resin, styrene-based resin, polycarbonate, polyolefin-based resin, and diethylene glycol diallyl carbonate.

[0008] Furthermore, the hardening layer is formed on the substrate layer by sol-gel molding, and the hardening layer is configured as a highly cross-linked siloxane resin layer.

[0009] Furthermore, the silicon dioxide layer, silicon nitride layer, titanium oxide layer, and indium oxide layer are all deposited using a magnetron sputtering coating machine.

[0010] Furthermore, the total thickness of the high-reflectivity near-infrared antireflective film is 685±42nm.

[0011] Furthermore, the waterproof membrane layer is configured as a fluoropolymer layer.

[0012] Beneficial effects:

[0013] This invention provides an anti-reflective lens for near-infrared laser protection. It features a 12-layer high-reflectivity near-infrared anti-reflective film, using silicon nitride and titanium dioxide as high-refractive-index thin-film materials and silicon dioxide as a low-refractive-index thin-film material. The alternating arrangement of these two materials with appropriate thicknesses significantly improves the reflectivity of the near-infrared spectrum, thereby reducing the transmittance of near-infrared lasers and minimizing near-infrared damage to the eyes, while having almost no impact on visible light transmittance. The lens exhibits a near-infrared reflectivity of over 50% and a visible light transmittance of over 98%. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the anti-reflective lens for near-infrared laser protection according to this utility model.

[0015] In the diagram, 1 is the substrate layer; 2 is the hardening layer; 3 is the first silicon dioxide layer; 4 is the first silicon nitride layer; 5 is the second silicon dioxide layer; 6 is the first titanium oxide layer; 7 is the third silicon dioxide layer; 8 is the second silicon nitride layer; 9 is the fourth silicon dioxide layer; 10 is the second titanium oxide layer; 11 is the fifth silicon dioxide layer; 12 is the third silicon nitride layer; 13 is the sixth silicon dioxide layer; 14 is the third titanium oxide layer; 15 is the indium oxide layer; 16 is the seventh silicon dioxide layer; and 17 is the waterproof membrane layer. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings.

[0017] As attached Figure 1 . Specific implementation examples:

[0019] An anti-reflective lens for near-infrared laser protection includes a substrate layer 1. A hardening layer 2 is disposed on both the upper and lower surfaces of the substrate layer 1. The surface of the hardening layer 2 is coated with a multi-layered high-reflectivity near-infrared anti-reflective film. The high-reflectivity near-infrared anti-reflective film comprises 12 layers: a first silicon dioxide layer 3, a first silicon nitride layer 4, a second silicon dioxide layer 5, a first titanium oxide layer 6, a third silicon dioxide layer 7, a second silicon nitride layer 8, a fourth silicon dioxide layer 9, a second titanium oxide layer 10, a fifth silicon dioxide layer 11, a third silicon nitride layer 12, a sixth silicon dioxide layer 13, and a third titanium oxide layer 14. An indium oxide layer 15, a seventh silicon dioxide layer 16, and a waterproof membrane layer 17 are also deposited on the high-reflectivity near-infrared anti-reflective film.

[0020] This embodiment limits the thickness of each layer of the lens by considering factors such as the refractive index, film stress, coefficient of thermal expansion, and adhesion. The specific limits are as follows: The thickness of the hardening layer 2 is 5±0.5μm. The thicknesses of the multilayer structure of the high-reflectivity near-infrared antireflective film are 152-166nm, 10-15nm, 33-38nm, 45-51nm, 110-123nm, 15-22nm, 43-47nm, 25-28nm, 87-95nm, 22-30nm, 46-52nm, and 55-60nm, respectively. The thickness of the indium oxide layer 15 is 6±1nm. The thicknesses of the seventh silicon dioxide layer 16 and the waterproof membrane layer 17 are 86-105nm and 30±5nm, respectively. The total thickness of the high-reflectivity near-infrared antireflective film is 685±42nm.

[0021] The substrate layer 1 is cured and molded from transparent resin, which includes acrylic resin, styrene resin, polycarbonate, polyolefin resin and diethylene glycol dielyl carbonate.

[0022] The hardening layer 2 is formed on the substrate layer 1 by sol-gel molding, and the hardening layer 2 is set as a highly cross-linked siloxane resin layer.

[0023] The indium oxide layer 15 has electrical conductivity and also serves as an antistatic agent.

[0024] The waterproof membrane layer 17 is a fluoropolymer layer, which can prevent water and pollution.

[0025] The silicon dioxide layer, silicon nitride layer, titanium oxide layer, and indium oxide layer 15 were all deposited using an SP-200 magnetron sputtering coating machine. The working gases were high-purity nitrogen and high-purity oxygen, and the sputtering gas was high-purity argon. The sputtered silicon atoms reacted with nitrogen to form silicon nitride and with oxygen to form silicon dioxide; the sputtered titanium atoms reacted with oxygen to form titanium oxide. The resulting multilayer composite high-reflectivity near-infrared antireflective film exhibits high transmittance in the visible light band and also provides some protection against near-infrared light. The film is uniform and robust, meeting the daily use requirements of resin lenses. Experimental results show that the prepared lens has a near-infrared reflectance of over 50% and a visible light transmittance of over 98%, effectively protecting the eyes without affecting visible light transmission while reflecting some near-infrared light.

[0026] Although the present invention has been disclosed above with reference to preferred embodiments, these are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection of the claims of this application.

Claims

1. An anti-reflective lens for blocking near-infrared lasers, characterized in that, The substrate includes a substrate layer, on both its upper and lower surfaces having a hardening layer. The surface of the hardening layer is coated with a multi-layered high-reflectivity near-infrared anti-reflection film. The high-reflectivity near-infrared anti-reflection film includes 12 layers: a first silicon dioxide layer, a first silicon nitride layer, a second silicon dioxide layer, a first titanium oxide layer, a third silicon dioxide layer, a second silicon nitride layer, a fourth silicon dioxide layer, a second titanium oxide layer, a fifth silicon dioxide layer, a third silicon nitride layer, a sixth silicon dioxide layer, and a third titanium oxide layer. An indium oxide layer, a seventh silicon dioxide layer, and a waterproof membrane layer are also coated on the high-reflectivity near-infrared anti-reflection film.

2. The anti-reflective lens for near-infrared laser protection according to claim 1, characterized in that, The thickness of the hardening layer is 5±0.5μm, and the thicknesses of the multilayer structure of the high-reflectivity near-infrared antireflective film are sequentially 152-166nm, 10-15nm, 33-38nm, 45-51nm, 110-123nm, 15-22nm, 43-47nm, 25-28nm, 87-95nm, 22-30nm, 46-52nm, and 55-60nm; the thickness of the indium oxide layer is 6±1nm; and the thicknesses of the seventh silicon dioxide layer and the waterproof membrane layer are 86-105nm and 30±5nm, respectively.

3. The anti-reflective lens for near-infrared laser protection according to claim 1, characterized in that, The substrate layer is formed by curing transparent resin.

4. The anti-reflective lens for near-infrared laser protection according to claim 1, characterized in that, The hardening layer is formed on the substrate layer by sol-gel molding, and the hardening layer is a highly cross-linked siloxane resin layer.

5. The anti-reflective lens for near-infrared laser protection according to claim 1, characterized in that, The silicon dioxide layer, silicon nitride layer, titanium oxide layer, and indium oxide layer were all deposited using a magnetron sputtering coating machine.

6. The anti-reflective lens for near-infrared laser protection according to claim 2, characterized in that, The total thickness of the high-reflectivity near-infrared antireflective film is 685±42nm.

7. The anti-reflective lens for near-infrared laser protection according to claim 1, characterized in that, The waterproof membrane layer is configured as a fluoropolymer layer.

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