Medium-near ultraviolet to visible light wide-wave domain anti-reflection film layer and lens

Abstract

The invention discloses a medium-near ultraviolet to visible light wide-wave domain anti-reflection film layer and a lens. The film layer is arranged on the concave surface of the lens; the film layer comprises a multi-layer structure which is sequentially stacked outwards from the concave surface of the lens, and the first layer to the fifth layer of the multi-layer structure are a first low-refractive-index silicon material layer, a second medium-refractive-index zirconium-titanium material mixed 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 in sequence. Benefited from the second medium-refractive-index zirconium-titanium material mixed material layer, the film layer can reduce the reflectivity of visible light while reducing the reflectivity of ultraviolet light, so that the anti-reflection from medium-near ultraviolet to visible light wide-wave domain is really realized. The lens coated with the film layer can prevent ultraviolet rays from entering eyes through secondary reflection, the eyes are prevented from being damaged, meanwhile, the visual comfort is improved, glare is reduced, and the effect of effectively protecting the eyes is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and mainly to a film layer and a lens with wide-wavelength anti-reflection function from mid-near ultraviolet to visible light. Background Art

[0002] The solar spectrum is a continuous spectrum with different wavelengths, which is divided into visible light and invisible light. Among them, invisible light is divided into ultraviolet (UV) and infrared (IR). UV includes long-wave ultraviolet UVA (320-380nm), medium-wave ultraviolet UVB (280-320nm) and short-wave ultraviolet UVC (100-280nm), while UVC is difficult to penetrate the atmosphere and irradiate the ground.

[0003] In the field of optical technology, especially eyewear manufacturing, most lens products on the market currently have two major problems: they cannot effectively achieve anti-UV reflection on the concave surface of the lens and fully absorb ultraviolet rays when dealing with the mid-to-near ultraviolet band of 280-380nm. The traditional methods in the field for anti-UV reflection on the concave surface of the lens and fully absorb ultraviolet rays have the following disadvantages:

[0004] (1) Traditional lenses tend to focus more on the anti-reflection treatment of the lenses in the visible light band to reduce the reflection of visible light entering the eyes, thereby improving visual clarity. However, the reflection problem of the lenses in the anti-ultraviolet band is often overlooked. Since the concave surface of the lens is closer to the eyes when worn, in the mid- and near-ultraviolet bands, if the concave surface is not effectively anti-reflective, ultraviolet rays may be reflected secondary inside the lens and then re-enter the human 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 when wearing it for a long time. Existing lens surface treatment technologies, such as coatings or coatings, can reduce reflections to a certain extent, but they are not ideal for ultraviolet protection in the 280-380nm band and cannot completely avoid the problem of secondary reflection of ultraviolet rays.

[0005] (2) Most lens products on the market solve the problem of UV absorption in the 280-380nm band 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 become ineffective over time and due to environmental factors, resulting in a decrease in absorption performance; on the other hand, although some materials have good UV absorption capabilities, their light transmittance, mechanical strength or processing performance may not meet the requirements of lens manufacturing. In addition, anti-reflective lenses on the market can often only achieve anti-visible light reflection or anti-ultraviolet light reflection, and cannot take into account both anti-ultraviolet light reflection and anti-visible light reflection at the same time, and achieve true anti-reflection in the wide-wave range from mid-to-near ultraviolet to visible light. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a film layer and a lens with wide-wavelength anti-reflection from mid-near ultraviolet to visible light.

[0007] According to a first aspect of the present invention, a film layer with wide-wavelength anti-reflection from mid-near ultraviolet to visible light is proposed, wherein the film layer is a multilayer structure stacked in sequence on the concave surface of a carrier outward, wherein 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 mixed 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 layer also includes a sixth waterproof and oil-proof protective layer.

[0008] Through the special mixed layer, the reasonable design of the optical thickness of each layer and the physical film thickness, the film layer has a strong transmittance in the wide-wave range from near-ultraviolet to visible light, which can effectively reduce the reflectivity of ultraviolet and visible light. The reflectivity of the wavelength in the near-ultraviolet band of 280-380nm is less than 2.5%, which can prevent the secondary reflection of ultraviolet rays from entering the eyes to the maximum extent, avoid eye damage, and play an effective role in protecting the eyes; the visible light reflectivity in the 380-780nm band is also better than the standard limit of 2.5%. The high transmittance of visible light helps to improve visual comfort, enhance contrast and recognition. The oil-proof and water-proof protective layer can effectively protect the film layer from physical wear and tear and extend the service life of the film layer.

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

[0010] Preferably, the material of the second medium refractive index zirconium-titanium material mixed material layer is a mixture of Ti3O5 and ZrO2, the optical thickness δ2 of the layer is 0.01-0.12, and the physical film thickness d2 is 1-12nm. Zirconium dioxide (ZrO2) has a high refractive index and a high hardness; while titanium pentoxide (Ti3O5) is a high refractive index optical material that can significantly reduce light reflection and improve light transmittance, and has the characteristics of low resistance, strong adhesion, not easy to splash, and good optical surface finish after film formation. The zirconium-titanium mixed film has a high refractive index and light transmittance, and a stable structure. Through the special refractive index and film thickness design, the zirconium-titanium material mixed layer can effectively reduce the ultraviolet and visible light reflectivity at the same time, and achieve anti-reflection in the wide-wave range from near ultraviolet to visible light.

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

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

[0013] Preferably, the material of the fifth low-refractive-index silicon material layer is SiO2, the optical thickness δ5 of the layer is 0.3-1.0, 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 properties of the film system, making the film layer less likely to be stained with stains, oil and dust, and extremely easy to clean, thereby maintaining good light transmittance and extending the service life.

[0015] According to a second aspect of the present invention, a lens is provided, wherein a film layer having a wide-wavelength anti-reflection function from mid-near ultraviolet to visible light is deposited on a concave surface of the lens by a vacuum evaporation process.

[0016] After adopting the above scheme, the beneficial effects of the present invention are:

[0017] The film layer of the present application has a strong transmittance in the mid-to-near ultraviolet to visible light wave domain. The design of the second medium refractive index zirconium-titanium material mixed material layer enables the film layer to reduce the reflectivity of ultraviolet light and visible light at the same time, which is an effect that cannot be achieved by the composite film layer using a single material layer in the prior art. The lens prepared using this film layer can effectively achieve anti-reflection in the mid-to-near ultraviolet to visible light wide-wave domain, prevent ultraviolet rays from entering the eyes through secondary reflection, avoid eye damage, and play an effective role in protecting the eyes; at the same time, it can also improve the visual comfort when wearing the lens, as well as enhance contrast and recognition and reduce glare. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 The optical path diagram of light passing through the existing coated lens is shown;

[0020] Figure 3 shows a light path diagram when light passes through according to an embodiment of the present invention;

[0021] Figure 4 shows a spectral reflection characteristic curve diagram according to Example 1 of the present invention;

[0022] Figure 5 A spectral reflection characteristic curve diagram of Comparative Example 1 according to the present invention is shown;

[0023] Figure 6 A spectral reflection characteristic curve diagram of Comparative Example 2 according to the present invention is shown;

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

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

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

[0027] Example 1

[0028] A lens with wide-band anti-reflection from near-ultraviolet to visible light

[0029] Lens substrates can be made of PC, TAC, PA, etc. Among them, PC is polycarbonate, a thermoplastic material, which is light 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 the physical properties of impact resistance and deformation resistance.

[0030] The new film layer is set on the concave surface of the lens, allowing the lens to absorb more UV rays and prevent secondary reflection of UV rays from entering the eyes without affecting the optical performance of the lens.

[0031] The material of the first low refractive index silicon material layer 1 is SiO2, the material of the second medium refractive index zirconium-titanium mixed material layer 2 is a mixture of Ti3O5 and ZrO2, the material of the third low refractive index silicon material layer 3 is SiO2, the material of the fourth medium refractive index zirconium material layer 4 is ZrO2, the material of the fifth low refractive index silicon material layer 5 is 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 the existing coated lens when the light passes through it. Figure 3 This is the optical path diagram of the coated lens of the present invention when the light passes through it, from Figure 2 and Figure 3By comparison, it can be seen that the coated lens of the present invention can effectively prevent the secondary reflection of ultraviolet light.

[0033] Comparative Example 1

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

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

[0036] Comparative Example 2

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

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

[0039] The membrane system design of the present invention is produced 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 is the refractive index of the i-th film material; d i is the physical film thickness of the i-th film layer; λ0 is the reference wavelength, which is 550nm in the present 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 of each embodiment and comparative example

[0044]

[0045] Figure 4-6 The spectral reflection characteristic curves of Example 1 and Comparative Examples 1-2 are shown in Table 1 and Figure 4-6It can be seen that the ultraviolet reflectivity of the mid-near ultraviolet to visible light wide-wave anti-reflection film layer of the present invention is 2.09%, and the visible light reflectivity is only 1.49%, which can reduce the reflectivity of ultraviolet and visible light at the same time; while the comparative examples 1 and 2 without using the zirconium-titanium material mixed layer have higher visible light reflectivity and ultraviolet reflectivity, respectively. This shows that the zirconium-titanium material mixed layer used in the mid-near ultraviolet to visible light wide-wave anti-reflection film layer of the present invention can easily reduce the reflectivity of ultraviolet and visible light at the same time, and whether a single material layer of zirconium material or titanium material is used, it is impossible to achieve simultaneous control of ultraviolet reflectivity and visible light reflectivity to achieve mid-near ultraviolet to visible light wide-wave anti-reflection.

[0046] The above describes the specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A film layer with wide-wavelength anti-reflection from near-ultraviolet to visible light, characterized in that: The film layer is a multilayer structure stacked in sequence on the concave surface of the carrier, wherein the first to fifth layers of the multilayer structure are respectively a first low-refractive-index silicon material layer, a second medium-refractive-index zirconium-titanium mixed 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 layer also includes a sixth protective layer.

2. The film layer for anti-reflection in the broad wavelength range from near-ultraviolet to visible light according to claim 1, characterized in that: The material of the first low-refractive-index silicon material layer is SiO2, the optical thickness δ1 of the layer is 0.3-1.0, and the physical film thickness d1 is 20-100 nm.

3. The film layer for anti-reflection in the broad wavelength range from near-ultraviolet to visible light according to claim 1, characterized in that: The material of the second medium refractive index zirconium-titanium mixed material layer is a mixture of Ti3O5 and ZrO2, the optical thickness δ2 of the layer is 0.01-0.12, and the physical film thickness d2 is 1-12nm.

4. The film layer for anti-reflection in the broad wavelength range from near-ultraviolet to visible light according to claim 1, characterized in that: The material of the third low-refractive-index silicon material layer is SiO2, the optical thickness δ3 of the layer is 0.1-0.7, and the physical film thickness d3 is 10-70 nm.

5. The film layer for anti-reflection in the broad wavelength range from near-ultraviolet to visible light according to claim 1, characterized in that: The material of the fourth medium refractive index zirconium material layer is ZrO2, the optical thickness δ4 of the layer is 1.0-1.5, and the physical film thickness d4 is 85-125nm.

6. The film layer for anti-reflection in the wide wavelength range from mid-ultraviolet to visible light according to claim 1, characterized in that: The material of the fifth low-refractive-index silicon material layer is SiO2, the optical thickness δ5 of the layer is 0.3-1.0, and the physical film thickness d5 is 20-100 nm.

7. The film layer having a wide-wavelength anti-reflection function from near-ultraviolet to visible light according to claim 1, characterized in that: The physical film thickness d6 of the protective layer is 2-10 nm.

8. A lens, characterized in that: The film layer with wide-wavelength anti-reflection from near-ultraviolet to visible light as described in any one of claims 1 to 7 is coated on the concave surface of the lens.

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