Optical lens

Abstract

The embodiment of the invention relates to the field of optical lenses, and provides an optical lens, which comprises a lens body, the first middle 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 antireflection film layer covers the surface, away from the first intermediate layer, of the second intermediate layer; the second antireflection film layer covers the surface, far away from the second intermediate layer, of the first antireflection film layer; the refractive index of the second intermediate layer is smaller than that of the first intermediate layer, and the effective refractive index of the second antireflection film layer is smaller than that of the first antireflection film layer; the material of the first intermediate layer comprises aluminum oxide, and the material of the second intermediate layer comprises a silicon-aluminum mixture or silicon dioxide; the first antireflection film layer and the second antireflection film layer comprise silicon dioxide spherical particles, and the diameter of the silicon dioxide spherical particles in the first antireflection film layer is larger than that of the silicon dioxide spherical particles in the second antireflection film layer. The ultra-low reflectivity can be considered, and meanwhile, the fogging and high-temperature-resistant and high-humidity-resistant face type change can be improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of optical lenses, and in particular to an optical lens. Background Art

[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] In order to improve the quality of the images taken by the camera, an optical lens is usually formed on the surface of the lens. However, due to the high reflectivity of the optical lens, the quality of the image taken does not meet expectations. Currently, the aluminum oxide hydrolysis process is usually used to obtain a camera with low reflectivity, but this process will cause fogging in actual shots. At the same time, for lenses made of hygroscopic materials such as EP, OKP, SP, and PMMA, physical vapor deposition (PVD coating) optical films are usually performed and then environmental testing experiments are conducted at high temperature and high humidity. The surface shape of the lens changes greatly, affecting the MTF performance after the reliability of the lens.

[0004] Therefore, it is necessary to propose an optical lens that takes into account reflectivity while improving the problem of fogging during actual shooting and resisting surface changes at high temperature and high humidity. Summary of the invention

[0005] The embodiment of the present invention provides an optical lens, which can at least improve the problem of fogging during actual shooting and the change of surface shape under high temperature and high humidity while taking into account the reflectivity.

[0006] According to some embodiments of the present invention, on the one hand, an optical lens is provided, comprising: a lens body and a composite film layer covering the lens body; the composite film layer comprises: a first intermediate layer, a second intermediate layer, a first anti-reflection film layer and a second anti-reflection 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-reflection film layer covers the surface of the second intermediate layer away from the first intermediate layer, and the second anti-reflection film layer covers the surface of the first anti-reflection film layer away from the second intermediate layer; wherein the refractive index of the second intermediate layer is smaller than the refractive index of the first intermediate layer, and the equivalent refractive index of the second anti-reflection film layer is smaller than the equivalent refractive index of the first anti-reflection 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 anti-reflection film layer and the second anti-reflection film layer comprise: spherical silicon dioxide particles, and the diameter of the spherical silicon dioxide particles in the first anti-reflection film layer is larger than the diameter of the spherical silicon dioxide particles in the second anti-reflection film layer.

[0007] In some embodiments, the equivalent refractive index of the first anti-reflection film layer is less than the refractive index of the second intermediate layer.

[0008] In some embodiments, the equivalent refractive index of the first anti-reflection film 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 anti-reflection film layer is 1.06 to 1.16.

[0010] In some embodiments, the thickness of the first intermediate layer is smaller than the thickness of the second intermediate layer, and / or the equivalent thickness of the first anti-reflection film layer is smaller than the equivalent thickness of the second anti-reflection film layer.

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

[0012] In some embodiments, the thickness of the first intermediate layer is 70 to 76 nm, and / or the thickness of the second intermediate layer is 75 to 80 nm, and / or the equivalent thickness of the first anti-reflection film layer is 83 to 95 nm, and / or the equivalent thickness of the second anti-reflection film layer is 100 to 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 embodiment of the present invention has at least the following advantages: first, the first intermediate layer and the second intermediate layer are sequentially arranged on the composite film layer on the lens body, which can improve the reliability of the optical lens, thereby preventing the optical lens from being abnormal due to the influence of temperature and humidity, and by arranging the first intermediate layer, it is also convenient to adjust the equivalent refractive index of the second intermediate layer, the first anti-reflection film layer and the second anti-reflection film layer, thereby facilitating the reduction of the reflectivity of the optical lens; secondly, the refractive index of the second intermediate layer is set to be smaller than the refractive index of the first intermediate layer, and the equivalent refractive index of the second anti-reflection film layer is set to be smaller than the equivalent refractive index of the first anti-reflection film layer, which can reduce the reflection of light from the second anti-reflection film layer into the first anti-reflection film layer, and can also reduce the reflection of light from the second intermediate layer into the first intermediate layer, thereby facilitating the improvement of the clarity of the image on the optical lens; finally, controlling the materials of the first intermediate layer and the second intermediate layer can facilitate the control of the performance of the first intermediate layer and the second intermediate layer, and controlling the size of the spherical silica particles of the first anti-reflection layer and the second anti-reflection layer can control the pores of the first anti-reflection layer and the second anti-reflection layer, thereby adjusting the equivalent refractive index of the first anti-reflection layer and the second anti-reflection layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] One or more embodiments are exemplarily described by pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the conventional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of a partial structure of an optical lens provided by one embodiment of the present invention;

[0017] Figure 2 A curve of reflectivity of an optical lens provided by an embodiment of the present invention when light rays of different wavelengths and different incident angles are incident on the optical lens;

[0018] Figure 3 A curve showing the change in reflectivity of an optical lens before and after testing provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0019] As can be seen from the background technology, in order to improve the quality of the images taken by the camera, a composite film is usually formed on the surface of the lens. In the relevant technology, some portable electronic devices have adopted a new coating technology-aluminum oxide hydrolysis process, which can obtain ultra-low reflectivity (visible light band, reflectivity reaches 0.1%), which has a significant improvement on the camera stray light ghosting and improves the overall image quality. However, this process has the problem of fogging in actual shooting due to the scattering characteristics, which is more obvious when multiple lenses of a single camera are applied with this process.

[0020] The embodiment of the present invention provides an optical lens, wherein a first intermediate layer and a second intermediate layer are sequentially arranged on a composite film layer on a lens body, so that the reliability of the optical lens can be improved, thereby preventing the optical lens from being abnormally affected by temperature and humidity. Moreover, by arranging the first intermediate layer, it is also convenient to adjust the equivalent refractive index of the second intermediate layer, the first anti-reflection film layer and the second anti-reflection film layer, thereby facilitating the reduction of the reflectivity of the optical lens. Secondly, the refractive index of the second intermediate layer is set to be smaller than the refractive index of the first intermediate layer, and the equivalent refractive index of the second anti-reflection film layer is set to be smaller than the equivalent refractive index of the first anti-reflection film layer, so as to reduce the reflection rate of the light from the second intermediate layer. The reflection of the anti-reflection film layer entering the first anti-reflection film layer can also reduce the reflection of light from the second intermediate layer entering the first intermediate layer, which is beneficial to improve the clarity of the image on the optical lens, and setting the equivalent refractive index of the second anti-reflection film layer to be low can also improve the problem of fogging in actual shooting; finally, controlling the materials of the first intermediate layer and the second intermediate layer can facilitate the control of the performance of the first intermediate layer and the second intermediate layer, and controlling the size of the spherical silica particles of the first anti-reflection layer and the second anti-reflection layer can control the pores of the first anti-reflection layer and the second anti-reflection layer, thereby adjusting the equivalent refractive index of the first anti-reflection layer and the second anti-reflection layer.

[0021] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

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

[0023] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects before and after are in an "or" relationship.

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

[0025] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0026] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0027] In the accompanying drawings corresponding to the embodiments of the present invention, the thickness and area of ​​the layers are exaggerated for better understanding and ease of description. When describing a component (such as a layer, a film, a region or a lens body) on another component or on the surface of another component, the component may be "directly" located on the surface of the other component, or a third component may exist between the two components. On the contrary, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component as being "substantially" 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 partial edge of the entire surface.

[0028] In the description of the embodiments of the present invention, when a component "includes" another component, unless otherwise specified, other components are not excluded, and other components may be further included. In addition, when a component such as a layer, film, region, or plate is referred to as "on / located on" another component, it can be "directly on" another component (i.e., located on the surface of another component without other components between the two), or another component may exist in between. In addition, 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 means that no other components are located in between.

[0029] The terms used in the description of the various embodiments described herein are only used to describe specific embodiments and are not intended to be limiting. As used in the description of the various embodiments described and in the appended claims, "the components" are also intended to include plural forms unless the context clearly indicates otherwise. Among them, components include components such as layers, films, regions, or plates.

[0030] The following will describe the various embodiments of the present invention in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that, in the various embodiments of the present invention, many technical details are provided in order to enable the reader to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present invention can be implemented.

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

[0032] In some embodiments, the 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 , and the first intermediate layer 101 covers the surface of the lens body 100 .

[0034] The composite film layer 110 further includes: a second intermediate layer 102 , and the second intermediate layer 102 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 anti-reflection film layer 103 , and the first anti-reflection film layer 103 covers a surface 101 of the second intermediate layer 102 away from the first intermediate layer.

[0036] The composite film layer 110 also includes: a second anti-reflection film layer 104, the second anti-reflection film layer 104 covers the surface of the first anti-reflection 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 anti-reflection film layer 104 is less than the equivalent refractive index of the first anti-reflection 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 anti-reflection film layer 103 and the second anti-reflection film layer 104 include: spherical silicon dioxide particles, and the diameter of the spherical silicon dioxide particles in the first anti-reflection film layer 103 is larger than the spherical silicon dioxide particles in the second anti-reflection film layer 104.

[0037] In the optical lens provided by the embodiment of the present invention, the composite film layer 110 on the lens body 100 sequentially arranges the first intermediate layer 101 and the second intermediate layer 102, which can improve the reliability of the optical lens, thereby preventing the optical lens from being abnormal due to the influence of temperature and humidity. Moreover, by setting the first intermediate layer 101, it is also convenient to adjust the equivalent refractive index of the second intermediate layer 102, the first anti-reflection film layer 103 and the second anti-reflection film layer 104, so as to facilitate reducing the reflectivity of the optical lens. Secondly, the refractive index of the second intermediate layer 102 is set to be smaller than the refractive index of the first intermediate layer 101, and the equivalent refractive index of the second anti-reflection film layer 104 is set to be smaller than the equivalent refractive index of the first anti-reflection film layer 103, which can reduce the light from the second anti-reflection film layer The reflection entering the first anti-reflection film layer 103 can also reduce the reflection of light entering the first intermediate layer 101 from the second intermediate layer 102, which is beneficial to improve the clarity of the image on the optical lens, and setting the second anti-reflection film layer 104 to have a low equivalent refractive index 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 can facilitate the control of the performance of the first intermediate layer 101 and the second intermediate layer 102, and controlling the size of the spherical silica particles of the first anti-reflection layer 103 and the second anti-reflection layer 104 can control the pores of the first anti-reflection layer 103 and the second anti-reflection layer 104, thereby adjusting the equivalent refractive index of the first anti-reflection layer 103 and the second anti-reflection layer 104.

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

[0039] In some embodiments, the material of the lens body 100 includes: EP (EP Polymer ethylene-propylene copolymer) material, OKP (petrochemical derivative plastic) material, SP (Spendex spandex) material or PMMA (PolymethylMethacrylate) material and other hygroscopic materials. For these materials, these materials easily absorb water vapor in the air, resulting in a large change in the surface shape of the lens body 100, which will affect the overall reliability. Therefore, by sequentially arranging the first intermediate layer 101, the second intermediate layer 102, the first anti-reflection film layer 103 and the second anti-reflection film layer 104 on the surface of the lens body 100, the overall high temperature and humidity resistance of the optical lens can be improved to avoid failure of the optical lens.

[0040] For the first intermediate layer 101, the refractive index of the first intermediate layer 101 can be 1.55 to 1.73, for example, 1.57, 1.6, 1.63, 1.67, 1.7 or 1.72, etc. For the first intermediate layer 101, the larger the refractive index of the first intermediate layer 101 is, the more likely it is to affect the dispersion coefficient of the final imaging pattern, and the smaller the refractive index of the first intermediate layer 101 is, the more likely it is that the light will be reflected on the surface of the first intermediate layer 101. Therefore, setting the refractive index of the first intermediate layer 101 to 1.55 to 1.73 can reduce the reflection of the light on the surface of the first intermediate layer 101 while taking into account the dispersion coefficient of the imaging pattern, thereby improving the performance of the optical lens.

[0041] The thickness of the first intermediate layer 101 may be 70-76 nm, for example, 71 nm, 72 nm, 73 nm, 74 nm or 75 nm, etc. For the first intermediate layer 101, setting the thickness of the first intermediate layer 101 to 70-76 nm can reduce the reflectivity of the optical lens as much as possible while ensuring the reliability of the optical lens.

[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 of the second intermediate layer 102 can be 1.38-1.55, for example, 1.39, 1.43, 1.46, 1.5 or 1.53, etc. For the second intermediate layer 102, the larger the refractive index of the second intermediate layer 102 is, the more likely it is to affect the dispersion coefficient of the final imaging pattern, and the smaller the refractive index of the second intermediate layer 102 is, the more likely it is that the light will be reflected on the surface of the second intermediate layer 102. Therefore, setting the refractive index of the second intermediate layer 102 to 1.55-1.73 can reduce the reflection of the light on the surface of the second intermediate layer 102 while taking into account the dispersion coefficient of the imaging pattern, thereby improving the performance of the optical lens.

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

[0045] In some embodiments, the thickness of the first intermediate layer 101 is less than the thickness of the second intermediate layer 102. It can be understood that the first intermediate layer 101 is the film layer closest to the lens body 100, that is, the light will pass through the first intermediate layer 101 to irradiate the surface of the lens body 100, and the greater the thickness of the first intermediate layer 101, the greater the probability of reflection and diffuse reflection. Therefore, in order to improve the imaging quality of the image 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, the light loss in the first intermediate layer 101 is avoided, and the reflectivity of the optical lens can be further reduced. Moreover, since the refractive index of the first intermediate layer 101 is high, the optical effect is guaranteed even if the thickness of the first intermediate layer 101 is reduced, so that the optical effect of the first intermediate layer 101 can be guaranteed while reducing the cost.

[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 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 making the second intermediate layer 102 have a certain reliability.

[0047] In some embodiments, setting the material of the second intermediate layer 102 to a silicon-aluminum mixture or silicon dioxide can facilitate controlling the refractive index of the second intermediate layer 102. Moreover, under the premise that the material of the first intermediate layer 101 is aluminum oxide, setting the material of the second intermediate layer 102 to a silicon-aluminum mixture or silicon dioxide can reduce the 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 anti-reflection film layer 103, the equivalent refractive index of the first anti-reflection film layer 103 may be less than the refractive index of the second intermediate layer 102. In this way, a structure is formed in which the equivalent refractive index decreases in sequence in the direction from the lens body 100 to the second anti-reflection film layer 104. In this way, during the incident process of light, although the medium is changing, the probability of light being reflected in different media is decreasing, thereby reducing the reflectivity of the optical lens. Moreover, the structure in which the equivalent refractive index decreases in sequence can avoid abnormalities caused by sudden changes in the refractive index.

[0049] In some embodiments, the equivalent refractive index of the first anti-reflection film layer 103 may 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 anti-reflection film layer 103 to be 1.2 to 1.35, the overall reflectivity of the optical lens is reduced, and the clarity of subsequent imaging is improved.

[0050] It should be noted that in the process of forming the first anti-reflection film layer 103, there may be a situation where the refractive index is different at various positions. For example, it is necessary to form a first anti-reflection film layer 103 with a refractive index of 1.3. Ideally, the refractive index of each position of the first anti-reflection film layer 103 is 1.3, but in actual conditions, there may be some positions with a refractive index higher than 1.3 and some positions with a refractive index lower than 1.3. Therefore, the above refractive index is explained using an equivalent refractive index. The equivalent refractive index here is actually the refractive index required under ideal conditions, and the equivalent reflectivity of this inhomogeneous layer can be simulated by macleod software to obtain the equivalent refractive index of the film layer.

[0051] In some embodiments, the equivalent thickness of the first anti-reflection film layer 103 can be controlled by controlling the porosity of the first anti-reflection film layer 103. The smaller the porosity of the first anti-reflection film layer 103, the greater the equivalent refractive index of the first anti-reflection film layer 103; the greater the porosity of the first anti-reflection film layer 103, the smaller the equivalent refractive index of the first anti-reflection film layer 103.

[0052] In some embodiments, the equivalent thickness of the first anti-reflection film layer 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 anti-reflection film layer 103 to 83-95 nm, the first anti-reflection film layer 103 can have a certain reliability while reducing the reflectivity of the optical lens, thereby reducing the interference of the external environment on the first anti-reflection film layer 103 and avoiding the failure of the first anti-reflection film layer 103.

[0053] It should be noted that, in the process of forming the first anti-reflection film layer 103, some positions may be thicker than others. For example, a first anti-reflection film layer 103 with a thickness of 85 nm needs to be formed. Ideally, the thickness of each position of the first anti-reflection film layer 103 is 85 nm. However, in actual conditions, some positions may have a thickness of 87 nm or less than 85 nm. Therefore, the above thickness is explained using an equivalent thickness. The equivalent thickness here is actually the thickness required under ideal conditions, and the equivalent thickness of this inhomogeneous layer can be simulated by the macleod software to obtain the equivalent thickness of the film layer.

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

[0055] The first anti-reflection film layer 103 may be a micro-nano film layer structure (LSC film), which also has the properties of a flat structure and low scattering rate, so that the problem of fogging during actual shooting can be solved by the first anti-reflection film layer 103. At the same time, the first anti-reflection film layer 103 has a loose film layer and low stress, which can improve the high temperature and humidity resistance of the optical lens.

[0056] For the second anti-reflection film layer 104, the equivalent refractive index of the second anti-reflection film layer 104 can be 1.06-1.16, 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 anti-reflection film layer 104 to 1.06-1.16, the difference in refractive index between the second anti-reflection film layer 104 and the air can be reduced, thereby reducing the reflection and scattering of light between the film layers when the light is incident on the second anti-reflection film layer 104, thereby improving the clarity of the final image formed.

[0057] In some embodiments, an optical lens including a first intermediate layer 101, a second intermediate layer 102, a first anti-reflection film layer 103 and a second anti-reflection film layer 104 can allow reflection and refraction to be repeated on the path of light, forming a mutual interference effect, thereby achieving the purpose of reducing reflected light and increasing transmitted light.

[0058] In some embodiments, the equivalent thickness of the second anti-reflection film layer 104 can be controlled by controlling the porosity of the second anti-reflection film layer 104. The smaller the porosity of the second anti-reflection film layer 104, the greater the equivalent refractive index of the second anti-reflection film layer 104; the greater the porosity of the second anti-reflection film layer 104, the smaller the equivalent refractive index of the second anti-reflection film layer 104.

[0059] In some embodiments, the equivalent thickness of the second anti-reflection film layer 104 is 100-115 nm, for example, 105 nm, 107 nm, 109 nm, 110 nm, 112 nm or 114 nm, etc. The thicker the second anti-reflection film layer 104 is, the higher the reflectivity of the second anti-reflection film layer 104 is. At the same time, the thicker the second anti-reflection film layer 104 is, the stronger the ability to improve the high temperature and high humidity resistance of the optical lens is. Therefore, the equivalent thickness of the second anti-reflection film layer 104 is set to 100-115 nm. While taking into account the reliability of the optical lens, the reflectivity of the second anti-reflection film layer 104 is controlled.

[0060] In some embodiments, the equivalent thickness of the first anti-reflection film layer 103 is less than the equivalent thickness of the second anti-reflection film layer 104. By setting the equivalent thickness of the first anti-reflection film layer 103 to be less than the equivalent thickness of the second anti-reflection film layer 104, the reflection or transmission of light in the first anti-reflection film layer 103 and the second anti-reflection film layer 104 can be effectively controlled, thereby reducing the reflection of light between the first anti-reflection film layer 103 and the second anti-reflection film layer 104, and increasing the transmission of light between the first anti-reflection film layer 103 and the second anti-reflection film 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 anti-reflection film layer 103, and the second anti-reflection film layer 104 increase in sequence from the lens body 100 to the second anti-reflection film layer 104. The reduction in film layer thickness will lead to a reduction in optical path difference, which is beneficial to improving the accuracy of forming a pattern on the surface of the lens body 100.

[0062] The diameter of the spherical particles in the first anti-reflection film layer 103 is large, so the pores of the first anti-reflection film layer 103 are small, resulting in a large equivalent refractive index of the first anti-reflection film layer 103. The diameter of the spherical particles in the second anti-reflection film layer 104 is small, so the pores of the second anti-reflection film layer 104 are large, resulting in a small equivalent refractive index of the second anti-reflection film layer 104, which can reduce the reflection of light from the second anti-reflection film layer into the first anti-reflection film layer 103.

[0063] The second anti-reflection film layer 104 may be a micro-nano film layer structure (LSC film), which also has the properties of a flat structure and low scattering rate, so that the problem of fogging during actual shooting can be solved by the second anti-reflection film layer 104. At the same time, the second anti-reflection film layer 104 has a loose film layer and low stress, which can improve the high temperature and humidity resistance of the optical lens.

[0064] In some embodiments, reference Figure 2 And Table 1, Figure 2 A curve of reflectivity when light with different incident angles enters an optical lens provided by 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 3 reflectivity curves at different incident angles are shown. In Table 1, R%@380-900nm represents the wavelength of the incident light, AOI 0 represents the incident angle of 0, AOI 45 represents the incident angle of 45°, AOI 60 represents the incident angle of 60°, Rmax / % represents the maximum value of the overall reflectivity of the first anti-reflection film layer 103 and the second anti-reflection film layer 104 when the wavelength of the incident light is 380-900nm, and Rave / % represents the average value of the overall reflectivity of the first anti-reflection film layer 103 and the second anti-reflection film layer 104 when the wavelength of the incident light is 380-900nm.

[0068] It can be seen that when the incident angle of the light is 0°, the average reflectivity of the first anti-reflection film layer 103 and the second anti-reflection film layer 104 in the 380-900nm band is 0.05%, and the maximum reflectivity is only 0.08%, which is lower than 0.1%, significantly reducing the reflectivity of the optical lens; when the incident angle of the light is 45°, the average reflectivity of the first anti-reflection film layer 103 and the second anti-reflection film layer 104 in the 380-900nm band is 0.18%, and the maximum reflectivity is only 0.53%; when the incident angle of the light is 60°, the average reflectivity of the first anti-reflection film layer 103 and the second anti-reflection film layer 104 in the 380-900nm band is only 1.29%, and the maximum reflectivity 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 for 120 hours front 0.3966μm 0.2497μm back 0.4234μm 0.2743μm

[0070] Table 2

[0071]

[0072] Table 3

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

[0074] The data in Table 2 are the changes in the height difference between the highest point and the lowest point 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 slightly before and after the test, and the degree of change is less than 0.2 μm.

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

[0076] It can be seen from Table 3 that the optical lens provided by the embodiment of the present invention has no film cracking, falling off, or wrinkling in the film layer under high temperature environment, low temperature environment, high temperature and high humidity environment, and alternating hot and humid environment, has good reliability, and improves the quality of the captured image.

[0077] Depend on Figure 3 It can be seen that after the optical lens provided by the embodiment of the present invention is continuously exposed to high temperature and high humidity for 120 hours, the reflectivity remains basically unchanged, and it has good reliability and can ensure the quality of the captured images.

[0078] It can be understood by those skilled in the art that the above-mentioned embodiments are specific embodiments of the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the embodiments of the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present invention, so the protection scope of the embodiments of the present invention shall be based on the scope defined in the claims.

Claims

1. An optical lens, characterized in that: include: A lens body and a composite film layer covering the lens body; The composite film layer comprises: a first intermediate layer, a second intermediate layer, a first anti-reflection film layer and a second anti-reflection 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-reflection film layer covers the surface of the second intermediate layer away from the first intermediate layer, and the second anti-reflection film layer covers the surface of the first anti-reflection film layer away from the second intermediate layer; Among them, the refractive index of the second intermediate layer is smaller than the refractive index of the first intermediate layer, and the equivalent refractive index of the second anti-reflection film layer is smaller than the equivalent refractive index of the first anti-reflection film layer; the material of the first intermediate layer includes: aluminum oxide, and / or, the material of the second intermediate layer includes: silicon aluminum mixture or silicon dioxide; the first anti-reflection film layer and the second anti-reflection film layer include: spherical silicon dioxide particles, and the diameter of the spherical silicon dioxide particles in the first anti-reflection film layer is larger than the spherical silicon dioxide particles in the second anti-reflection film layer.

2. The optical lens according to claim 1, characterized in that: The equivalent refractive index of the first anti-reflection film layer is smaller than the refractive index of the second intermediate layer.

3. The optical lens according to claim 1 or 2, characterized in that: The equivalent refractive index of the first anti-reflection film layer is 1.2 to 1.35, and / or the refractive index of the second intermediate layer is 1.38 to 1.

55.

4. The optical lens according to claim 1, characterized in that: The refractive index of the first intermediate layer is 1.55 to 1.73, and / or the equivalent refractive index of the second anti-reflection film layer is 1.06 to 1.

16.

5. The optical lens according to claim 1, characterized in that: The thickness of the first intermediate layer is smaller than the thickness of the second intermediate layer, and / or the equivalent thickness of the first anti-reflection film layer is smaller than the equivalent thickness of the second anti-reflection film layer.

6. The optical lens according to claim 1 or 5, characterized in that: The thickness of the second intermediate layer is less than the equivalent thickness of the first anti-reflection film layer.

7. The optical lens according to claim 1 or 5, characterized in that: The thickness of the first intermediate layer is 70 to 76 nm, and / or the thickness of the second intermediate layer is 75 to 80 nm, and / or the equivalent thickness of the first anti-reflection film layer is 83 to 95 nm, and / or the equivalent thickness of the second anti-reflection film layer is 100 to 115 nm.

8. The optical lens according to claim 1, characterized in that: The material of the lens body includes: EP material, OKP material, SP material or PMMA material.

Images