A film layer and lens with anti-reflection in a wide wave band from mid-ultraviolet to visible light

Abstract

The application discloses a middle-near ultraviolet-to-visible light wide-waveband anti-reflection film layer and a lens, the film layer is arranged on a concave surface of the lens, the film layer comprises a multilayer structure which is stacked in sequence from the concave surface of the lens outwards, and the first layer to the fifth layer of the multilayer structure are a first low-refractive silicon material layer, a second middle-refractive zirconium-titanium material mixed material layer, a third low-refractive silicon material layer, a fourth middle-refractive zirconium material layer and a fifth low-refractive silicon material layer in sequence. Benefited from the second middle-refractive zirconium-titanium material mixed material layer, the film layer can reduce the reflectivity of visible light while reducing the reflectivity of ultraviolet light, and truly realizes the middle-near ultraviolet-to-visible light wide-waveband anti-reflection. The lens covered with the film layer can prevent the secondary reflection of ultraviolet light from entering the eyes, avoid damaging the eyes, improve visual comfort and reduce glare at the same time, and plays an effective role in protecting the eyes.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and mainly to a film and lens with anti-reflection properties in the mid-to-near ultraviolet to visible light wide-range waveband. Background Technology

[0002] The solar spectrum is a continuous spectrum with different wavelengths, divided into visible and invisible light. Invisible light is further divided into ultraviolet (UV) and infrared (IR) rays. UV includes long-wave ultraviolet A (320-380nm), medium-wave ultraviolet B (280-320nm), and short-wave ultraviolet C (100-280nm), while UVC rays have difficulty penetrating the atmosphere to reach the ground.

[0003] In the field of optical technology, particularly eyewear manufacturing, most lens products currently on the market generally suffer from two major problems when dealing with the mid-to-near ultraviolet (280-380nm) wavelength range: they cannot simultaneously and effectively achieve both concave surface UV reflection reduction and sufficient ultraviolet absorption. Traditional methods for addressing both concave surface UV reflection reduction and sufficient ultraviolet absorption in this field have the following drawbacks:

[0004] (1) Traditional lenses often focus more on anti-reflection treatment in the visible light band to reduce visible light reflection entering the eye and thus improve visual clarity. However, the issue of anti-ultraviolet (UV) reflection is often overlooked. Because the concave surface of the lens is closer to the eye when worn, in the mid-to-near UV band, if the concave surface is not effectively treated for anti-reflection, UV rays may undergo secondary reflection inside the lens and re-enter the eye, causing damage to sensitive tissues such as the retina. This secondary reflection phenomenon not only reduces the protective effect of the lens but also increases the discomfort of users during prolonged wear. Existing lens surface treatment technologies, such as coatings or plating, can reduce reflection to some extent, but their effect on UV protection in the 280-380nm band is not ideal and cannot completely avoid the problem of secondary UV reflection.

[0005] (2) Most commercially available lenses address the issue of UV absorption in the 280-380nm wavelength range by adding UV absorbers or using specific materials. However, these methods often have limitations in practical applications. On the one hand, UV absorbers may gradually lose their effectiveness over time and due to environmental factors, leading to a decline in absorption performance. On the other hand, while some materials may have good UV absorption capabilities, their light transmittance, mechanical strength, or processing performance may not meet the requirements for lens manufacturing. Furthermore, commercially available anti-reflective lenses often only provide protection against visible light reflection or UV light reflection, failing to simultaneously address both UV and visible light reflection, thus failing to achieve true anti-reflection across a wide wavelength range from near-ultraviolet to visible light. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides a film and lens with anti-reflection properties in the mid-to-near ultraviolet to visible light wide-band range.

[0007] According to a first aspect of the present invention, a wide-band anti-reflection film for near-ultraviolet to visible light is provided. The film is a multilayer structure stacked sequentially with the concave surface of the carrier facing outwards. The first to fifth layers of the multilayer structure are, in sequence, a first low-refractive-index silicon material layer, a second medium-refractive-index zirconium-titanium material hybrid material layer, a third low-refractive-index silicon material layer, a fourth medium-refractive-index zirconium material layer, and a fifth low-refractive-index silicon material layer. The film also includes a sixth waterproof and oil-proof protective layer.

[0008] Through a specially designed hybrid layer and optimized optical and physical film thicknesses, this film exhibits strong transmittance across a wide wavelength range from near-ultraviolet to visible light. It effectively reduces the reflectance of both ultraviolet and visible light, with a reflectance of less than 2.5% in the near-ultraviolet band (280-380nm). This minimizes secondary reflection of ultraviolet light into the eyes, preventing damage and providing effective eye protection. The visible light reflectance in the 380-780nm band also exceeds the standard limit of 2.5%. This high visible light transmittance contributes to improved visual comfort, enhanced contrast, and improved visibility. An oil- and water-resistant protective layer effectively protects the film from physical abrasion, extending its lifespan.

[0009] Preferably, the first low-refractive-index silicon material layer is made of SiO2, with an optical thickness δ1 of 0.3-1.0 nm and a physical film thickness d1 of 20-100 nm. The SiO2 film has high transmittance to visible light, and by precisely controlling the optical and physical film thicknesses of the SiO2 film, the transmission or reflection of light of a specific wavelength can be achieved. Furthermore, the SiO2 film can improve the adhesion between the entire film layer and the substrate.

[0010] Preferably, the second zirconium-titanium hybrid material layer is a mixture of Ti3O5 and ZrO2, with an optical thickness δ2 of 0.01-0.12 nm and a physical film thickness d2 of 1-12 nm. Zirconium dioxide (ZrO2) has a high refractive index and high hardness; while titanium pentoxide (Ti3O5) is a high refractive index optical material that can significantly reduce light reflection, improve light transmittance, and has the characteristics of low resistance, strong adhesion, resistance to sputtering, and excellent optical surface finish after film formation. The zirconium-titanium hybrid film has high refractive index and light transmittance, and a stable structure. Through special refractive index and film thickness design, the zirconium-titanium hybrid material layer can effectively reduce ultraviolet and visible light reflectivity simultaneously, achieving anti-reflection in a wide wavelength range from near-ultraviolet to visible light.

[0011] Preferably, the material of the third low-refractive-index silicon material layer is SiO2, and the optical thickness δ3 of the layer is 0.1-0.7 nm, and the physical film thickness d3 is 10-70 nm.

[0012] Preferably, the fourth zirconium material layer is made of ZrO2, and the optical thickness δ4 of the layer is 1.0-1.5 nm, and the physical film thickness d4 is 85-125 nm.

[0013] Preferably, the fifth low-refractive-index silicon material layer is made of SiO2, and the optical thickness δ5 of this layer is 0.3-1.0 nm, and the physical film thickness d5 is 20-100 nm.

[0014] Preferably, the physical film thickness d6 of the protective layer is 2-10 nm. The waterproof and oil-proof protective layer can greatly improve the stability, scratch resistance, mechanical properties and waterproof performance of the film system, making the film layer less prone to stains, oil and dust, and easy to clean. It maintains good light transmittance and extends service life.

[0015] According to a second aspect of the present invention, a lens is provided in which a wide-band anti-reflective film covering the mid-to-near ultraviolet to visible light range is deposited on the concave surface of the lens by a vacuum evaporation process.

[0016] After adopting the above solution, the beneficial effects of the present invention are as follows:

[0017] The coating layer of this application exhibits strong transmittance across the mid-to-near ultraviolet to visible light spectrum. The design of the second refractive index zirconium-titanium hybrid material layer enables the coating layer to simultaneously reduce the reflectivity of both ultraviolet and visible light, an effect unattainable by existing composite coating layers using a single material layer. Lenses made using this coating layer effectively achieve broad-spectrum anti-reflection across the mid-to-near ultraviolet to visible light spectrum, preventing secondary reflection of ultraviolet rays into the eye and avoiding eye damage, thus effectively protecting the eyes. Simultaneously, it also improves visual comfort when wearing the lens, enhances contrast and visibility, and reduces glare. Attached Figure Description

[0018] Figure 1 A schematic diagram of a membrane layer structure according to an embodiment of the present invention is shown;

[0019] Figure 2 This shows the optical path diagram of light passing through an existing coated lens;

[0020] Figure 3 An optical path diagram of light passing through an embodiment according to the present invention is shown;

[0021] Figure 4 The spectral reflectance characteristics curve of Embodiment 1 according to the present invention is shown;

[0022] Figure 5 A graph showing the spectral reflectance characteristics of Comparative Example 1 according to the present invention is shown;

[0023] Figure 6 The spectral reflectance characteristics curve of Comparative Example 2 according to the present invention are shown;

[0024] Among them, 1-first low-refractive-index silicon material layer, 2-second medium-refractive-index zirconium-titanium material hybrid material layer, 3-third low-refractive-index silicon material layer, 4-fourth medium-refractive-index zirconium material layer, 5-fifth low-refractive-index silicon material layer, and 6-protective layer. Detailed Implementation

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The layered structure of the membrane layer of the present invention is as follows: Figure 1 As shown, the film is deposited on the concave surface of the carrier, and from the concave surface of the carrier outwards, it consists of a first low-refractive-index silicon material layer 1, a second medium-refractive-index zirconium-titanium material layer 2, a third low-refractive-index silicon material layer 3, a fourth medium-refractive-index zirconium material layer 4, a fifth low-refractive-index silicon material layer 5, and a sixth protective layer 6.

[0027] Example 1

[0028] A lens with broad anti-reflective range from near-ultraviolet to visible light.

[0029] 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.

[0030] The new coating is applied to the concave surface of the lens, enabling the lens to absorb more ultraviolet rays and preventing secondary reflection of ultraviolet rays into the eye without affecting the optical performance of the lens.

[0031] The first low-refractive-index silicon material layer 1 is made of SiO2, the second medium-refractive-index zirconium-titanium material layer 2 is made of a mixture of Ti3O5 and ZrO2, the third low-refractive-index silicon material layer 3 is made of SiO2, the fourth medium-refractive-index zirconium material layer 4 is made of ZrO2, the fifth low-refractive-index silicon material layer 5 is made of SiO2, and the sixth layer is a protective layer 6 with waterproof and oil-proof properties.

[0032] Figure 2 This is the optical path diagram of light passing through an existing coated lens. Figure 3 This is the optical path diagram of light passing through the coated lens of the present invention. Figure 2 and Figure 3As can be seen from the comparison, the coated lens of the present invention can effectively prevent secondary reflection of ultraviolet light.

[0033] Comparative Example 1

[0034] The difference between this comparative example and Example 1 is as follows:

[0035] The material of the second refractive index material layer 2 is Ti3O5, and the material of the fourth refractive index material layer 4 is Ti3O5.

[0036] Comparative Example 2

[0037] The difference between this comparative example and Example 1 is as follows:

[0038] The material of the second refractive index layer 2 is ZrO2, and the material of the fourth refractive index layer 4 is Ti3O5.

[0039] The membrane system of this invention is manufactured in the following manner:

[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 d is the refractive index of the i-th film layer material; i λ is the physical thickness of the i-th film layer; λ0 is the reference wavelength, which is 550nm in this invention.

[0042] The material data and performance parameters of each embodiment and comparative example are shown in Table 1:

[0043] Table 1 Summary of material data and performance parameters for each embodiment and comparative example

[0044]

[0045] Figure 4-6 The spectral reflectance characteristics of Example 1 and Comparative Examples 1-2 are shown in Table 1 and Table 2. Figure 4-6As can be seen, the ultraviolet reflectance of the mid-to-near ultraviolet to visible light wide-range antireflection film of the present invention is 2.09%, and the visible light reflectance is only 1.49%, which can simultaneously reduce the reflectance of ultraviolet and visible light. In contrast, Comparative Examples 1 and 2, which do not use a zirconium-titanium hybrid layer, have higher visible light and ultraviolet light reflectance, respectively. This indicates that the zirconium-titanium hybrid layer used in the mid-to-near ultraviolet to visible light wide-range antireflection film of the present invention can easily reduce the reflectance of both ultraviolet and visible light simultaneously. However, neither a single material layer of zirconium nor titanium can achieve simultaneous control of ultraviolet and visible light reflectance, thus failing to achieve mid-to-near ultraviolet to visible light wide-range antireflection.

[0046] The specific embodiments of this application have been described above, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A wide-band anti-reflection film covering the mid-to-near ultraviolet to visible light range, characterized in that: The film layer is a multilayer structure stacked sequentially with the concave surface of the carrier facing outwards. The first to fifth layers of the multilayer structure are, in sequence, a first low-refractive-index silicon material layer, a second medium-refractive-index zirconium-titanium material hybrid material layer, a third low-refractive-index silicon material layer, a fourth medium-refractive-index zirconium material layer, and a fifth low-refractive-index silicon material layer. The first low-refractive-index silicon material layer is a SiO2 layer with a physical film thickness d1 = 20-100 nm. The second medium-refractive-index zirconium-titanium material hybrid material layer is a Ti3O5 and ZrO2 hybrid material layer with a physical film thickness d2 = 1-12 nm and an optical thickness δ2 = 0.01-0.12 nm. The optical thickness is measured as 1 / 4 of the reference wavelength optical thickness, which is 550 nm. The third low-refractive-index silicon material layer is a SiO2 layer with a physical film thickness d3 of 10-70 nm. The fourth medium-refractive-index zirconium material layer is a ZrO2 layer with a physical film thickness d4 of 85-125 nm. The fifth low-refractive-index silicon material layer is a SiO2 layer with a physical film thickness d5 of 20-100 nm. The film layer also includes a sixth protective layer. The average reflectivity of the film layer in the 280-380 nm and 380-780 nm wavelength bands is less than 2.5%.

2. The anti-reflection film in the mid-to-near ultraviolet to visible light wide-bandwidth range according to claim 1, characterized in that: The optical thickness δ1 of the first low-refractive-index silicon material layer is 0.3-1.

0.

3. The anti-reflection film in the mid-to-near ultraviolet to visible light wide-bandwidth range according to claim 1, characterized in that: The optical thickness δ3 of the third low-refractive-index silicon material layer is 0.1-0.

7.

4. The anti-reflection film in the mid-to-near ultraviolet to visible light wide-bandwidth range according to claim 1, characterized in that: The optical thickness δ4 of the fourth zirconium material layer with refractive index is 1.0-1.

5.

5. The anti-reflection film layer in the mid-to-near ultraviolet to visible light wide-bandwidth range according to claim 1, characterized in that: The optical thickness δ5 of the fifth low-refractive-index silicon material layer is 0.3-1.

0.

6. The anti-reflection film in the mid-to-near ultraviolet to visible light wide-bandwidth range according to claim 1, characterized in that: The physical film thickness d6 of the protective layer is 2-10 nm.

7. A lens, characterized in that: The anti-reflective coating for the mid-to-near ultraviolet to visible light wide range, as described in any one of claims 1-6, is deposited on the concave surface of the lens.

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