Optical lens

Abstract

The embodiment of the present application relates to the field of optical lenses, and provides an optical lens, comprising: a lens body; a first intermediate layer covering a surface of the lens body; a second intermediate layer covering a surface of the first intermediate layer away from the lens body; a first anti-reflection film layer covering a surface of the second intermediate layer away from the first intermediate layer; a second anti-reflection film layer covering a surface of the first anti-reflection film layer away from the second intermediate layer; the refractive index of the second intermediate layer is less than the refractive index of the first intermediate layer, and the equivalent refractive index of the second anti-reflection film layer is less than the equivalent refractive index of the first anti-reflection film layer; the material of the first intermediate layer comprises: aluminum oxide, the material of the second intermediate layer comprises: silicon-aluminum mixture or silicon dioxide; the first anti-reflection film layer and the second anti-reflection film layer comprise: silicon dioxide spherical particles, and the diameter of the silicon dioxide spherical particles in the first anti-reflection film layer is greater than the diameter of the silicon dioxide spherical particles in the second anti-reflection film layer. The actual shooting haze and the high-temperature and high-humidity surface shape change can be improved while the ultra-low reflectivity is considered.

Description

Technical Field

[0001] The present invention relates to the field of optical lenses, and particularly to an optical lens. Background Technology

[0002] With the development of terminal technology, camera function has become an important feature of smart terminals and a major indicator for evaluating terminal performance.

[0003] To improve the image quality captured by a camera, optical lenses are typically formed on the surface of the lens. However, due to the high reflectivity of these optical lenses, the improvement in image quality is not as expected. Currently, alumina hydrolysis is commonly used to obtain cameras with low reflectivity, but this process can lead to fogging issues in actual shooting. Furthermore, for lenses made of moisture-absorbing materials such as EP, OKP, SP, and PMMA, physical vapor deposition (PVD coating) is typically applied to create optical thin films, followed by high-temperature and high-humidity environmental testing. This results in significant changes in the lens's surface shape, affecting the MTF performance and overall lens reliability.

[0004] Therefore, it is necessary to propose an optical lens that can improve the problem of fogging in real-world shooting while taking into account reflectivity and resist changes in surface shape under high temperature and high humidity. Summary of the Invention

[0005] This invention provides an optical lens that can at least improve the problem of fogging in real-world shooting and resist changes in surface shape under high temperature and high humidity while taking into account reflectivity.

[0006] According to some embodiments of the present invention, one aspect of the present invention provides an optical lens, comprising: a lens body and a composite film layer covering the lens body; the composite film layer comprising: a first intermediate layer, a second intermediate layer, a first antireflective film layer, and a second antireflective film layer; the first intermediate layer covers the surface of the lens body, the second intermediate layer covers the surface of the first intermediate layer away from the lens body, the first antireflective film layer covers the surface of the second intermediate layer away from the first intermediate layer, and the second antireflective film layer covers the surface of the first antireflective film layer away from the second intermediate layer; wherein, the refractive index of the second intermediate layer is less than the refractive index of the first intermediate layer, and the equivalent refractive index of the second antireflective film layer is less than the equivalent refractive index of the first antireflective film layer; the material of the first intermediate layer comprises: aluminum oxide, and / or, the material of the second intermediate layer comprises: a silicon-aluminum mixture or silicon dioxide; the first antireflective film layer and the second antireflective film layer comprise: spherical silicon dioxide particles, and the diameter of the spherical silicon dioxide particles in the first antireflective film layer is larger than that in the second antireflective film layer.

[0007] In some embodiments, the equivalent refractive index of the first antireflective coating is less than the refractive index of the second intermediate layer.

[0008] In some embodiments, the equivalent refractive index of the first antireflective coating layer is 1.2 to 1.35, and / or the refractive index of the second intermediate layer is 1.38 to 1.55.

[0009] In some embodiments, the refractive index of the first intermediate layer is 1.55 to 1.73, and / or the equivalent refractive index of the second antireflective coating layer is 1.06 to 1.16.

[0010] In some embodiments, the thickness of the first intermediate layer is less than the thickness of the second intermediate layer, and / or the equivalent thickness of the first antireflective coating layer is less than the equivalent thickness of the second antireflective coating layer.

[0011] In some embodiments, the thickness of the second intermediate layer is less than the equivalent thickness of the first antireflective film layer.

[0012] In some embodiments, the thickness of the first intermediate layer is 70-76 nm, and / or the thickness of the second intermediate layer is 75-80 nm, and / or the equivalent thickness of the first antireflective coating layer is 83-95 nm, and / or the equivalent thickness of the second antireflective coating layer is 100-115 nm.

[0013] In some embodiments, the material of the lens body includes: EP material, OKP material, SP material or PMMA material.

[0014] The technical solution provided by the embodiments of the present invention has at least the following advantages: First, by sequentially setting a first intermediate layer and a second intermediate layer on the composite film layer on the lens body, the reliability of the optical lens can be improved, thereby avoiding abnormalities caused by temperature and humidity. Moreover, by setting the first intermediate layer, it is also convenient to adjust the equivalent refractive index of the second intermediate layer, the first antireflective film layer, and the second antireflective film layer, thereby facilitating the reduction of the reflectivity of the optical lens. Second, by setting the refractive index of the second intermediate layer to be less than that of the first intermediate layer, and the equivalent refractive index of the second antireflective film layer to be less than that of the first antireflective film layer, the reflection of light entering the first antireflective film layer from the second antireflective film layer can be reduced, and the reflection of light entering the first intermediate layer from the second intermediate layer can also be reduced, thereby improving the clarity of the image on the optical lens. Finally, controlling the materials of the first and second intermediate layers facilitates the control of the performance of the first and second intermediate layers. Controlling the size of the silica spherical particles in the first and second antireflective layers can control the porosity of the first and second antireflective layers, thereby adjusting the equivalent refractive index of the first and second antireflective layers. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrative descriptions do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a partial structural diagram of an optical lens provided in an embodiment of the present invention;

[0017] Figure 2 A curve showing the reflectivity of an optical lens provided in an embodiment of the present invention when light of different wavelengths and incident at different incident angles is incident on it.

[0018] Figure 3 The curve showing the change in reflectivity of the optical lens before and after testing is provided for an embodiment of the present invention. Detailed Implementation

[0019] As the background technology shows, to improve the image quality captured by cameras, composite films are typically formed on the surface of lenses. Among related technologies, some portable electronic devices have adopted a new coating technology—alumina hydrolysis—which can achieve ultra-low reflectivity (0.1% in the visible light band), significantly improving camera stray light and ghosting, and enhancing overall image quality. However, this process suffers from a problem of fogging in actual shots due to its scattering characteristics, which is particularly noticeable when multiple lenses in a single camera are used.

[0020] This invention provides an optical lens in which a first intermediate layer and a second intermediate layer are sequentially disposed on a composite film layer on the lens body. This improves the reliability of the optical lens and prevents it from malfunctioning due to temperature and humidity. Furthermore, the first intermediate layer facilitates adjustment of the equivalent refractive index of the second intermediate layer, the first antireflective film layer, and the second antireflective film layer, thereby reducing the reflectivity of the optical lens. Additionally, the refractive index of the second intermediate layer is lower than that of the first intermediate layer, and the equivalent refractive index of the second antireflective film layer is lower than that of the first antireflective film layer, which reduces the amount of light escaping from the second intermediate layer. The reflection of light entering the first antireflective layer can also reduce the reflection of light entering the first intermediate layer from the second intermediate layer, thereby improving the image clarity on the optical lens. Moreover, setting the equivalent refractive index of the second antireflective layer to be low can also improve the problem of fogging in actual shooting. Finally, controlling the materials of the first and second intermediate layers makes it easier to control their performance. Controlling the size of the silica spherical particles in the first and second antireflective layers can control the porosity of the first and second antireflective layers, thereby adjusting the equivalent refractive index of the first and second antireflective layers.

[0021] In the description of the embodiments of this invention, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this invention, "multiple" means two or more, unless otherwise explicitly defined.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments of this invention, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0024] In the description of the embodiments of the present invention, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0025] In the description of the embodiments of the present invention, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0026] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0027] In the accompanying drawings corresponding to the embodiments of the present invention, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or lens body) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0028] In the description of embodiments of the present invention, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly" on the other component (i.e., located on the surface of the other component with no other components between them), or it can have another component present in between. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located in between.

[0029] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "component" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0030] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of the present invention to facilitate a better understanding of the invention. However, the technical solutions claimed in this invention can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0031] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an optical lens provided by the present invention.

[0032] In some embodiments, an optical lens may include a lens body 100 and a composite film layer 110 covering the lens body 100.

[0033] The composite film layer 110 includes: a first intermediate layer 101, which covers the surface of the lens body 100.

[0034] The composite film layer 110 further includes a second intermediate layer 102, which covers the surface of the first intermediate layer 101 away from the lens body 100.

[0035] The composite film layer 110 further includes: a first antireflective film layer 103, which covers the surface 101 of the second intermediate layer 102 away from the first intermediate layer.

[0036] The composite film layer 110 further includes: a second antireflective film layer 104, which covers the surface of the first antireflective film layer 103 away from the second intermediate layer 102, wherein the refractive index of the second intermediate layer 102 is less than the refractive index of the first intermediate layer 101, and the equivalent refractive index of the second antireflective film layer 104 is less than the equivalent refractive index of the first antireflective film layer 103; the material of the first intermediate layer 101 includes: aluminum oxide, and / or the material of the second intermediate layer 102 includes: a silicon-aluminum mixture or silicon dioxide; the first antireflective film layer 103 and the second antireflective film layer 104 include: silicon dioxide spherical particles, and the diameter of the silicon dioxide spherical particles in the first antireflective film layer 103 is larger than that in the second antireflective film layer 104.

[0037] The optical lens provided in this embodiment of the invention has a first intermediate layer 101 and a second intermediate layer 102 sequentially disposed on the composite film layer 110 on the lens body 100. This improves the reliability of the optical lens and avoids abnormalities caused by temperature and humidity. Furthermore, by providing the first intermediate layer 101, it is easier to adjust the equivalent refractive index of the second intermediate layer 102, the first antireflective film layer 103, and the second antireflective film layer 104, thereby reducing the reflectivity of the optical lens. Additionally, by setting the refractive index of the second intermediate layer 102 to be lower than that of the first intermediate layer 101, and the equivalent refractive index of the second antireflective film layer 104 to be lower than that of the first antireflective film layer 103, it is possible to reduce light loss from the second antireflective film layer. The reflection entering the first antireflective coating layer 103 can also reduce the reflection of light entering the first intermediate layer 101 from the second intermediate layer 102, thereby improving the image clarity on the optical lens. Moreover, setting the equivalent refractive index of the second antireflective coating layer 104 to be low can also improve the problem of fogging in actual shooting. Finally, controlling the materials of the first intermediate layer 101 and the second intermediate layer 102 makes it easier to control the performance of the first intermediate layer 101 and the second intermediate layer 102. Controlling the size of the silica spherical particles of the first antireflective layer 103 and the second antireflective layer 104 can control the porosity of the first antireflective layer 103 and the second antireflective layer 104, thereby adjusting the equivalent refractive index of the first antireflective layer 103 and the second antireflective layer 104.

[0038] The diameter of the silica spherical particles in the first antireflective coating layer 103 is 100-300 nm, and the diameter of the silica spherical particles in the second antireflective coating layer 104 is 50-200 nm.

[0039] In some embodiments, the material of the lens body 100 includes hygroscopic materials such as EP (EP Polymer), OKP (Oxide-based Plastic), SP (Spendex), or PMMA (Polymethyl Methacrylate). These materials readily absorb moisture from the air, leading to significant changes in the surface shape of the lens body 100 and affecting overall reliability. Therefore, by sequentially depositing a first intermediate layer 101, a second intermediate layer 102, a first antireflective coating layer 103, and a second antireflective coating layer 104 on the surface of the lens body 100, the overall high-temperature and high-humidity resistance of the optical lens can be improved, preventing optical lens failure.

[0040] The refractive index of the first intermediate layer 101 can be between 1.55 and 1.73, for example, 1.57, 1.6, 1.63, 1.67, 1.7, or 1.72, etc. For the first intermediate layer 101, a higher refractive index may affect the dispersion coefficient of the final image pattern, while a lower refractive index may lead to reflection of light on its surface. Therefore, setting the refractive index of the first intermediate layer 101 to 1.55 to 1.73 can reduce the reflection of light on its surface while maintaining the dispersion coefficient of the image pattern, thereby improving the performance of the optical lens.

[0041] The thickness of the first intermediate layer 101 can be 70–76 nm, such as 71 nm, 72 nm, 73 nm, 74 nm, or 75 nm, etc. Setting the thickness of the first intermediate layer 101 to 70–76 nm can minimize the reflectivity of the optical lens while ensuring its reliability.

[0042] In some embodiments, the material of the first intermediate layer 101 may include aluminum oxide.

[0043] For the second intermediate layer 102, the refractive index can be 1.38 to 1.55, for example, 1.39, 1.43, 1.46, 1.5, or 1.53, etc. A higher refractive index for the second intermediate layer 102 may affect the dispersion coefficient of the final image pattern, while a lower refractive index may cause light to reflect off its surface. Therefore, setting the refractive index of the second intermediate layer 102 to 1.55 to 1.73 can reduce light reflection on its surface while maintaining the dispersion coefficient of the image pattern, thereby improving the performance of the optical lens.

[0044] The refractive index of the second intermediate layer 102 is calculated and optimized based on the first intermediate layer 101, so as to cooperate with the first intermediate layer 101 to reduce the overall reflectivity of the optical lens, thereby forming an ultra-low reflectivity optical lens.

[0045] In some embodiments, the thickness of the first intermediate layer 101 is less than the thickness of the second intermediate layer 102. It is understood that the first intermediate layer 101 is the film layer closest to the lens body 100, meaning that light will pass through the first intermediate layer 101 to illuminate the surface of the lens body 100. The greater the thickness of the first intermediate layer 101, the greater the probability of reflection and diffuse reflection. Therefore, to improve the image quality on the lens body 100, by controlling the thickness of the first intermediate layer 101 to be less than the thickness of the second intermediate layer 102, excessive light loss within the first intermediate layer 101 can be avoided, further reducing the reflectivity of the optical lens. Moreover, due to the high refractive index of the first intermediate layer 101, the optical effect is maintained even with a reduced thickness, thus ensuring the optical performance of the first intermediate layer 101 while reducing costs.

[0046] In some embodiments, the thickness of the second intermediate layer 102 is 75-80 nm. Setting the thickness of the second intermediate layer 102 to 75-80 nm is the optimal thickness of the second intermediate layer 102 obtained based on the first intermediate layer 101. Within this thickness range, the overall reflectivity of the optical lens can be reduced as much as possible while ensuring that the second intermediate layer 102 has a certain degree of reliability.

[0047] In some embodiments, using a silicon-aluminum mixture or silicon dioxide as the material for the second intermediate layer 102 facilitates control of the refractive index of the second intermediate layer 102. Furthermore, if the material for the first intermediate layer 101 is aluminum oxide, using a silicon-aluminum mixture or silicon dioxide as the material for the second intermediate layer 102 can reduce lattice mismatch at the contact interface between the first intermediate layer 101 and the second intermediate layer 102, thereby improving the reliability of the connection between the first intermediate layer 101 and the second intermediate layer 102.

[0048] For the first antireflective coating layer 103, the equivalent refractive index of the first antireflective coating layer 103 can be less than the refractive index of the second intermediate layer 102. This creates a structure where the equivalent refractive index decreases sequentially from the lens body 100 towards the second antireflective coating layer 104. Thus, during light incidence, although the medium changes, the probability of light reflection in different media decreases, thereby reducing the reflectivity of the optical lens. Furthermore, the sequentially decreasing equivalent refractive index structure avoids anomalies caused by abrupt changes in refractive index.

[0049] In some embodiments, the equivalent refractive index of the first antireflective coating layer 103 can be 1.2 to 1.35, for example, 1.21, 1.25, 1.27, 1.3, 1.32, or 1.34, etc. By controlling the equivalent refractive index of the first antireflective coating layer 103 to be 1.2 to 1.35, the overall reflectivity of the optical lens is reduced while the clarity of subsequent imaging is improved.

[0050] It should be noted that during the formation of the first antireflective coating 103, there may be different refractive indices at different locations. For example, if the first antireflective coating 103 with a refractive index of 1.3 is to be formed, ideally, the refractive index of the first antireflective coating 103 at all locations should be 1.3. However, in reality, there may be some locations with a refractive index higher than 1.3 and some locations with a refractive index lower than 1.3. Therefore, the refractive index mentioned above is described using the equivalent refractive index. The equivalent refractive index here is actually the refractive index required under ideal conditions. Moreover, the equivalent refractive index of such a heterogeneous layer can be obtained by simulating it using the Macleod software.

[0051] In some embodiments, the equivalent thickness of the first antireflective film 103 can be controlled by controlling the porosity of the first antireflective film 103. The smaller the porosity of the first antireflective film 103, the larger the equivalent refractive index of the first antireflective film 103. The larger the porosity of the first antireflective film 103, the smaller the equivalent refractive index of the first antireflective film 103.

[0052] In some embodiments, the equivalent thickness of the first antireflective coating 103 is 83–95 nm, for example, 85 nm, 87 nm, 90 nm, 91 nm, or 94 nm, etc. By setting the equivalent thickness of the first antireflective coating 103 to 83–95 nm, the reflectivity of the optical lens can be reduced while ensuring the reliability of the first antireflective coating 103, thereby reducing the interference of the external environment on the first antireflective coating 103 and preventing the first antireflective coating 103 from failing.

[0053] It should be noted that during the formation of the first antireflection film 103, there may be some areas that are thicker than others. For example, if the first antireflection film 103 needs to be 85nm thick, ideally, the thickness of the first antireflection film 103 at all locations should be 85nm. However, in reality, there may be some locations with a thickness of 87nm or less than 85nm. Therefore, the above thickness is described using the equivalent thickness. The equivalent thickness here is actually the thickness required under ideal conditions. Moreover, the equivalent thickness of such a non-homogeneous layer can be obtained by simulating the film using the Macleod software.

[0054] In some embodiments, the thickness of the second intermediate layer 102 may be less than the equivalent thickness of the first antireflective coating layer 103. By setting the thickness of the second intermediate layer 102 to be less than the equivalent thickness of the first antireflective coating layer 103, the reflection or transmission of light between the second intermediate layer 102 and the first antireflective coating layer 103 can be effectively controlled, thereby reducing the reflection of light between the second intermediate layer 102 and the first antireflective coating layer 103 and increasing the transmission of light between the second intermediate layer 102 and the first antireflective coating layer 103, thereby improving the performance of the optical lens.

[0055] The first antireflective coating 103 can be a micro / nano film structure (LSC film). This structure also has the properties of a smooth structure and low scattering rate, thus solving the problem of fogging in actual shooting through the first antireflective coating 103. At the same time, the loose film layer and low stress of the first antireflective coating 103 can improve the high temperature and high humidity resistance of the optical lens.

[0056] For the second antireflective coating layer 104, the equivalent refractive index of the second antireflective coating layer 104 can be 1.06 to 1.16, for example, 1.1, 1.11, 1.12, 1.13, 1.14, or 1.14, etc. By setting the equivalent refractive index of the second antireflective coating layer 104 to 1.06 to 1.16, the difference in refractive index between the second antireflective coating layer 104 and air can be reduced, thereby reducing the reflection and scattering of light between the layers when light is incident on the second antireflective coating layer 104, thus improving the clarity of the final image.

[0057] In some embodiments, the optical lens comprising a first intermediate layer 101, a second intermediate layer 102, a first antireflection film layer 103, and a second antireflection film layer 104 can cause reflection and refraction to occur repeatedly along the path of light, forming an interference effect, thereby achieving the purpose of reducing reflected light and increasing transmitted light.

[0058] In some embodiments, the equivalent thickness of the second antireflective film 104 can be controlled by controlling the porosity of the second antireflective film 104. The smaller the porosity of the second antireflective film 104, the larger the equivalent refractive index of the second antireflective film 104; the larger the porosity of the second antireflective film 104, the smaller the equivalent refractive index of the second antireflective film 104.

[0059] In some embodiments, the equivalent thickness of the second antireflective coating 104 is 100–115 nm, such as 105 nm, 107 nm, 109 nm, 110 nm, 112 nm, or 114 nm, etc. The thicker the second antireflective coating 104, the higher its reflectivity. Simultaneously, a thicker second antireflective coating 104 enhances the optical lens's resistance to high temperatures and humidity. Therefore, setting the equivalent thickness of the second antireflective coating 104 to 100–115 nm controls its reflectivity while considering the reliability of the optical lens.

[0060] In some embodiments, the equivalent thickness of the first antireflective coating layer 103 is less than the equivalent thickness of the second antireflective coating layer 104. By setting the equivalent thickness of the first antireflective coating layer 103 to be less than the equivalent thickness of the second antireflective coating layer 104, the reflection or transmission of light between the first antireflective coating layer 103 and the second antireflective coating layer 104 can be effectively controlled, thereby reducing the reflection of light between the first antireflective coating layer 103 and the second antireflective coating layer 104 and increasing the transmission of light between the first antireflective coating layer 103 and the second antireflective coating layer 104, thereby improving the performance of the optical lens.

[0061] In some embodiments, the equivalent thicknesses of the first intermediate layer 101, the second intermediate layer 102, the first antireflective film layer 103, and the second antireflective film layer 104 increase sequentially in the direction from the lens body 100 to the second antireflective film layer 104. The reduction in film thickness leads to a decrease in optical path difference, thereby improving the accuracy of pattern formation on the surface of the lens body 100.

[0062] The spherical particles in the first antireflective coating 103 have a large diameter, resulting in small pores and a high equivalent refractive index. Conversely, the spherical particles in the second antireflective coating 104 have a small diameter, resulting in large pores and a low equivalent refractive index. This reduces the reflection of light entering the first antireflective coating 103 from the second antireflective coating.

[0063] The second antireflective coating 104 can be a micro / nano film structure (LSC film). This structure also has the properties of a smooth structure and low scattering rate, thus solving the problem of fogging in actual shooting through the second antireflective coating 104. At the same time, the porous structure and low stress of the second antireflective coating 104 can improve the high temperature and high humidity resistance of the optical lens.

[0064] In some embodiments, reference Figure 2 and Table 1, Figure 2 The curves show the reflectivity of light rays incident on an optical lens at different incident angles, as provided in an embodiment of the present invention.

[0065] R%@380-900nm AOI 0 AOI 45 AOI 60 Rmax / % 0.08 0.53 2.76 Rave / % 0.05 0.18 1.29

[0066] Table 1

[0067] in, Figure 2 The table shows the reflectance curves for three different incident angles. In Table 1, R%@380-900nm represents the wavelength of the incident light, AOI 0 represents an incident angle of 0°, AOI 45 represents an incident angle of 45°, and AOI 60 represents an incident angle of 60°. Rmax / % represents the maximum value of the overall reflectance of the first antireflection film 103 and the second antireflection film 104 when the wavelength of the incident light is 380-900nm. Rave / % represents the average value of the overall reflectance of the first antireflection film 103 and the second antireflection film 104 when the wavelength of the incident light is 380-900nm.

[0068] It can be seen that when the incident angle of light is 0°, the average reflectance of the first antireflective coating layer 103 and the second antireflective coating layer 104 in the 380-900nm wavelength band is 0.05%, and the maximum reflectance is only 0.08%, which is lower than 0.1%, significantly reducing the reflectance of the optical lens. When the incident angle of light is 45°, the average reflectance of the first antireflective coating layer 103 and the second antireflective coating layer 104 in the 380-900nm wavelength band is 0.18%, and the maximum reflectance is only 0.53%. When the incident angle of light is 60°, the average reflectance of the first antireflective coating layer 103 and the second antireflective coating layer 104 in the 380-900nm wavelength band is only 1.29%, and the maximum reflectance is only 2.76%, which can significantly improve the overall optical properties.

[0069] Lens body surface Before high temperature and humidity High temperature and high humidity 120h front 0.3966μm 0.2497μm back 0.4234μm 0.2743μm

[0070] Table 2

[0071]

[0072] Table 3

[0073] Refer to Tables 2 and 3 and Figure 3 Table 2 shows the change in height difference between the highest and lowest points on the surface of the lens body 100 before and after the test, and Table 3 shows the changes in the appearance of the optical lens under different test conditions. Figure 3 The curve represents the change in the reflectivity of the optical lens before and after the test.

[0074] The data in Table 2 shows the change in height difference between the highest and lowest points on the surface of the lens body 100 before and after the test. It can be seen that the surface of the film layer changes little before and after the test, with the degree of change being less than 0.2 μm.

[0075] In Table 3, high temperature refers to the condition of 85℃±2℃, low temperature refers to the condition of -40℃±2℃, double 85 high temperature and high humidity refers to the condition of temperature of 85℃±2℃ and humidity of 85%±5%RH, and alternating damp heat refers to the cyclic test in which the initial temperature rises to 85℃±2℃ and the initial humidity rises to 85%±5%RH, and then drops back to the initial temperature.

[0076] As can be seen from Table 3, the optical lens provided by the embodiments of the present invention exhibits no film cracking, peeling, or wrinkling in high-temperature, low-temperature, high-humidity, or alternating humid heat environments, demonstrating good reliability and improving the quality of acquired images.

[0077] Depend on Figure 3 As can be seen, after the optical lens provided in this embodiment of the invention has been subjected to high temperature and high humidity for 120 hours, the reflectivity remains basically unchanged, which shows good reliability and can guarantee the quality of the captured images.

[0078] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of the embodiments of the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the embodiments of the present invention; therefore, the scope of protection of the embodiments of the present invention should be determined by the scope defined in the claims.

Claims

1. An optical lens, characterized in that, include: The lens body and the composite film layer covering the lens body; The composite film layer includes: a first intermediate layer, a second intermediate layer, a first antireflective film layer, and a second antireflective film layer; The first intermediate layer covers the surface of the lens body, the second intermediate layer covers the surface of the first intermediate layer away from the lens body, the first anti-reflective coating layer covers the surface of the second intermediate layer away from the first intermediate layer, and the second anti-reflective coating layer covers the surface of the first anti-reflective coating layer away from the second intermediate layer. Wherein, the refractive index of the second intermediate layer is less than that of the first intermediate layer, and the equivalent refractive index of the second antireflective coating layer is less than that of the first antireflective coating layer; the material of the first intermediate layer includes aluminum oxide, and the material of the second intermediate layer includes a silicon-aluminum mixture or silicon dioxide; the first and second antireflective coating layers include spherical silicon dioxide particles, and the diameter of the spherical silicon dioxide particles in the first antireflective coating layer is larger than that in the second antireflective coating layer; The equivalent refractive index of the first antireflective coating layer is less than the refractive index of the second intermediate layer; The thickness of the first intermediate layer is less than the thickness of the second intermediate layer; The refractive index of the first intermediate layer is 1.55~1.73, and the refractive index of the second intermediate layer is 1.38~1.55; The equivalent thickness of the first antireflective coating layer is smaller than the equivalent thickness of the second antireflective coating layer; The thickness of the second intermediate layer is less than the equivalent thickness of the first antireflective coating layer; The thickness of the first intermediate layer is 70~76nm, the thickness of the second intermediate layer is 75~80nm, the equivalent thickness of the first antireflection film is 83~95nm, and the equivalent thickness of the second antireflection film is 100~115nm.

2. The optical lens according to claim 1, characterized in that, The equivalent refractive index of the first antireflective coating is 1.2~1.

35.

3. The optical lens according to claim 1, characterized in that, The equivalent refractive index of the second antireflective coating is 1.06~1.

16.

4. The optical lens according to claim 1, characterized in that, The lens body is made of materials including EP, OKP, SP, or PMMA.

Images