Composite membrane structure

Abstract

The composite film layer structure provided by the present invention comprises a substrate, and an intermediate layer, a first low-reflection film layer, and a second low-reflection film layer sequentially coated on the substrate, wherein the equivalent refractive index of the second low-reflection film layer is smaller than that of the first low-reflection film layer. When the incident angle is 0°, the average reflectance of the composite film layer structure in the 380-980 nm band is less than 0.1%, and it is endowed with ultra-low reflectance and low scattering characteristics, effectively solving the problem of clouding and significantly improving image quality.

Description

Technical Field

[0005] ,

[0004] , , , , , , ,

[0006] ,

[0001] The present invention relates to the technical field of optical lens coatings, and particularly to a composite film layer structure.

Background Art

[0002] In recent years, with the rapid development of science and technology, users' requirements for the image quality captured by cameras in portable electronic devices have become increasingly high, and lens coating technology has also become epoch-making. In related technologies, some portable electronic devices already adopt a new coating technology, namely the alumina hydrolysis process. After being coated by such a process, the lens can obtain an ultra-low reflectivity of 0.1% within the visible light band, significantly improve the ghosting of the camera, and improve the quality of the overall captured image. However, this process has an actual fogging problem caused by scattering characteristics. Especially when multiple lenses in one camera apply this process, the fogging problem is more likely to be prominent.

[0003] Therefore, it is necessary to provide a new composite film layer structure to meet the ultra-low reflectivity while reducing scattering and solve the technical problem of lens fogging during actual shooting.

Summary of the Invention

[0004] The object of the present invention is to overcome the above technical problems and provide a composite film layer structure with low reflectivity and low scattering.

[0005] To achieve the above object, the present invention provides a composite film layer structure, including a substrate, an intermediate layer coated on the substrate, a first low-reflection film layer coated on the surface of the intermediate layer away from the substrate, and a second low-reflection film layer coated on the surface of the first low-reflection film layer away from the intermediate layer. The equivalent refractive index of the second low-reflection film layer is smaller than that of the first low-reflection film layer.

[0006] Preferably, the equivalent refractive index of the first low-reflection film layer is n1, and the equivalent refractive index of the second low-reflection film layer is n2, where 1.15 ≤ n1 ≤ 1.38 and 1.05 ≤ n2 ≤ 1.15.

[0007] Preferably, the thickness of the first low-reflection film layer and the thickness of the second low-reflection film layer are both 50-200 nm.

[0008] Preferably, both the first low-reflection film layer and the second low-reflection film layer contain silica spherical particles with a diameter of 50-150 nm, wherein the diameter of the silica spherical particles in the first low-reflection film layer is greater than the diameter of the silica spherical particles in the second low-reflection film layer, and the porosity of the first low-reflection film layer is smaller than the porosity of the second low-reflection film layer.

[0009] Preferably, the substrate is a resin lens.

[0010] Preferably, the intermediate layer contains at least one of Ti3O5, H4, Nb2O5, HfO2, L5 silicon aluminum mixture, SiO2, MgF2, and Al2O3.

[0011] Compared to related technologies, the composite film layer structure provided by the present invention includes a substrate, an intermediate layer, a first low-reflection film layer, and a second low-reflection film layer sequentially coated on the substrate, wherein the equivalent refractive index of the second low-reflection film layer is smaller than that of the first low-reflection film layer. When the incident angle is 0°, the average reflectance of the composite film layer structure is less than 0.1% in the 380-980 nm band, and it is equipped with ultra-low reflectance and low scattering characteristics, effectively solving the problem of clouding and significantly improving image quality. [Brief explanation of the drawing]

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings that are necessary for describing the embodiments. Clearly, the drawings in the following description are merely some embodiments of the present invention, and those skilled in the art can obtain further drawings based on these without any creative work. [Figure 1] This is a schematic diagram of the composite film layer structure in the present invention. [Figure 2] This is a SEM surface profile diagram of the first low-reflection layer in the composite film structure of the present invention. [Figure 3] This is a SEM surface topography diagram of a film structure using conventional technology. [Figure 4] This is a diagram showing reflectance data for different incident angles of film structures using conventional technology. [Figure 5] This is a schematic diagram showing the reflectance of the composite film layer structure in the present invention at different incident angles. [Modes for carrying out the invention]

[0013] The following clearly and completely describes the technical solutions in embodiments of the present invention with reference to the drawings of the embodiments, and it is clear that the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained based on the embodiments of the present invention, without creative work by a person skilled in the art, are all within the scope of the protection of the present invention.

[0014] As shown in Figure 1, the present invention provides a composite film layer structure 100 comprising a substrate 10, an intermediate layer 20 coated on the substrate 10, a first low-reflection film layer 30 coated on the surface of the intermediate layer 20 away from the substrate 10, and a second low-reflection film layer 40 coated on the surface of the first low-reflection film layer 30 away from the intermediate layer 20.

[0015] Here, the thickness of the first low-reflection film layer 30 is 50-200 nm. The thickness of the second low-reflection film layer 40 is also 50-200 nm. The thicknesses of the first low-reflection film layer 30 and the second low-reflection film layer 40 may be the same or different, and can be adjusted according to actual needs.

[0016] Figure 2 shows the SEM surface shape of the first low-reflection film layer 30. Specifically, the first low-reflection film layer 30 is manufactured from silica spherical particles with a diameter of 50-150 nm. The second low-reflection film layer 40 is also manufactured from silica spherical particles with a diameter of 50-150 nm. However, in the composite film layer structure 100 provided by the present invention, the diameter of the silica spherical particles in the first low-reflection film layer 30 is larger than the diameter of the silica spherical particles in the second low-reflection film layer 40. The silica spherical particles in the first low-reflection film layer 30 are large and therefore have low porosity, while the silica spherical particles in the second low-reflection film layer 40 are small and have high porosity, resulting in a porosity of the first low-reflection film layer 30 being smaller than that of the second low-reflection film layer 40. Here, the equivalent refractive index of the second low-reflection film layer 40 is smaller than that of the first low-reflection film layer 30. Specifically, the equivalent refractive index of the first low-reflection film layer 30 is n1, and the equivalent refractive index of the second low-reflection film layer 40 is n2, satisfying 1.15 ≤ n1 ≤ 1.38 and 1.05 ≤ n2 ≤ 1.15.

[0017] As can be seen from Figure 3, in conventional technology, the surface shape of the film structure manufactured using the alumina hydrolysis process exhibits a grass-like structure, with relatively sharp particle edges. This results in significant scattering when light rays reach the film structure, causing clouding during actual shooting and affecting image quality. The SEM surface shape diagram of the first low-reflection film layer 30 in the present invention, shown in Figure 2, reveals that the outer shape of the silica spherical particles is flat. Thus, the light scattering problem can be effectively solved, improving image acquisition quality.

[0018] As can be understood, the substrate 10 is a resin lens, and its raw material can be selected from one of APEL, EP, OKP, SP, and K26R. The intermediate layer 20 contains at least one of Ti3O5, H4, Nb2O5, HfO2, L5 silicon aluminum mixture, SiO2, MgF2, and Al2O3.

[0019] Furthermore, the present invention further provides reflectivity data of the composite film layer structure 100 and the conventional AR film structure when the angle of incidence AOI is 0°, 45°, and 60°. The specific data is as shown in Table 1 below. JPEG2026512177000002.jpg33158

[0020] Referring to Table 1, FIG. 4, and FIG. 5 above, the superiority of the reflectivity of the composite film layer structure 100 in the present invention is clear compared with the conventional AR film structure. When the angle of incidence AOI of the light ray is 0°, the average value Rave of the reflectivity within the 380 - 980 nm band of the composite film layer structure 100 is 0.05%, and the maximum value Rmax of the reflectivity is only 0.07%, which is lower than 0.1%. Compared with the conventional AR film structure, a very large improvement can be seen. When the angle of incidence AOI of the light ray is 60°, the average value Rave of the reflectivity within the 380 - 980 nm band of the composite film layer structure 100 is 0.97%, which is less than one-fifth of the reflectivity of the conventional AR film, and it has significant superiority in optical properties.

[0021] The present invention further tests the reliability of the composite film layer structure 100, and the test conditions are shown in Table 2 below. JPEG2026512177000003.jpg27165

[0022] The composite film layer structure 100 provided by the present invention has no film layer peeling, film cracking, and clouding phenomena in high-temperature environments, high-temperature and high-humidity environments, low-temperature environments, and thermal shock environments, and has good reliability. When a user uses an optical lens having the composite film layer structure in various extreme environments, good image quality can be obtained.

[0023] Compared with related technologies, the composite film layer structure provided by the present invention includes a substrate, and an intermediate layer, a first low-reflection film layer, and a second low-reflection film layer sequentially coated on the substrate. The equivalent refractive index of the second low-reflection film layer is smaller than the equivalent refractive index of the first low-reflection film layer. When the angle of incidence is 0°, the average value of the reflectivity within the 380 - 980 nm band of the composite film layer structure is less than 0.1%, and it has ultra-low reflectivity and low scattering characteristics, effectively solving the problem of clouding and significantly improving the image quality.

[0024] The above descriptions are merely embodiments of the present invention, and it should be noted that those skilled in the art can make further improvements without departing from the original spirit of the invention, but all of these improvements fall within the scope of protection of the present invention.

Claims

1. It is a composite film layer structure, A composite film layer structure comprising a substrate, an intermediate layer coated on the substrate, a first low-reflection film layer coated on the surface of the intermediate layer away from the substrate, and a second low-reflection film layer coated on the surface of the first low-reflection film layer away from the intermediate layer, wherein the equivalent refractive index of the second low-reflection film layer is smaller than that of the first low-reflection film layer.

2. The composite film layer structure according to claim 1, characterized in that the equivalent refractive index of the first low-reflection film layer is n1, the equivalent refractive index of the second low-reflection film layer is n2, and 1.15 ≤ n1 ≤ 1.38 and 1.05 ≤ n2 ≤ 1.

15.

3. The composite film layer structure according to claim 1, characterized in that the thickness of the first low-reflection film layer and the thickness of the second low-reflection film layer are both 50-200 nm.

4. The composite film layer structure according to claim 1, characterized in that both the first low-reflection film layer and the second low-reflection film layer contain silica spherical particles having a diameter of 50-150 nm, the diameter of the silica spherical particles in the first low-reflection film layer is greater than the diameter of the silica spherical particles in the second low-reflection film layer, and the porosity of the first low-reflection film layer is smaller than the porosity of the second low-reflection film layer.

5. The composite film layer structure according to claim 1, characterized in that the substrate is a resin lens.

6. The intermediate layer is Ti ３ O ５ , H4, Nb ２ O ５ , HfO ２ , L5 silicon-aluminum mixture, SiO ２ , MgF ２ , Al ２ O ３ The composite film layer structure according to claim 1, characterized by including at least one of the above.

Images