Lens assembly, camera module and electronic device

Abstract

The application discloses a lens assembly, a camera module and an electronic device. The lens assembly comprises a lens body, a carbon element film layer and a coating film layer. The coating film layer is located between the lens body and the carbon element film layer. The coating film layer comprises a first film layer and a second film layer stacked together. The refractive index of the first film layer is greater than that of the second film layer.

Description

Technical Field

[0001] This application belongs to the technical field of electronic devices, specifically relating to a lens assembly, a camera module, and an electronic device. Background Technology

[0002] In related technologies, electronic devices include camera modules, but the lens components of these modules lack sufficient rigidity. When using electronic devices, the lens components are easily scratched or abraded by sharp objects, resulting in scratches of varying depths. This increases the error in light reflection, and the reflected light with these errors forms "ghosting" when received by the image sensor, affecting the product's performance. Summary of the Invention

[0003] This application aims to provide a lens assembly, camera module, and electronic device, which solves one of the problems in the related technology where the lens assembly of the camera module is not hard enough, resulting in the lens assembly being easily scratched and abraded, which makes the captured image prone to "ghosting".

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] In a first aspect, embodiments of this application propose a lens assembly, comprising: a lens body; a carbon elemental film layer; and a coating layer, wherein the coating layer is located between the lens body and the carbon elemental film layer, and the coating layer comprises a first film layer and a second film layer stacked thereon, wherein the refractive index of the first film layer is greater than the refractive index of the second film layer.

[0006] Secondly, embodiments of this application provide a camera module, including: a lens assembly as described in the first aspect.

[0007] Thirdly, embodiments of this application provide an electronic device, including: and a camera module as described in the second aspect.

[0008] In embodiments of this application, the lens assembly includes a lens body, a carbon element film layer, and a coating layer.

[0009] The coating layer is located between the lens body and the carbon film layer. The carbon film layer and the coating layer work together to increase the hardness of the lens body, improve the abrasion resistance of the lens assembly, and have an anti-scratch effect, which is beneficial to improving the performance of the lens assembly.

[0010] In addition, the coating layer includes a first film layer and a second film layer, which are stacked together. The first film layer and the second film layer have different refractive indices; specifically, the refractive index of the first film layer is greater than that of the second film layer. That is, by setting film layers with different refractive indices, the reflectivity of the lens assembly to light can be reduced by utilizing the difference between high and low refractive indices, thereby improving the "ghosting" phenomenon produced when the camera module is shooting.

[0011] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0012] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0013] Figure 1 This is a schematic diagram of the lens assembly according to the first embodiment of this application;

[0014] Figure 2 This is a schematic diagram of the lens assembly according to the second embodiment of this application.

[0015] Figure label:

[0016] Figure 1 and Figure 2 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0017] 10 Lens assembly, 100 Carbon elemental film layer, 200 Coating layer, 210 First film layer, 220 Second film layer, 300 Mixed film layer, 400 Waterproof layer, 500 Undercoat layer, 600 Lens body. Detailed Implementation

[0018] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] The following is combined Figure 1 and Figure 2 This application describes a lens assembly 10, a camera module, and an electronic device according to embodiments thereof.

[0023] like Figure 1 and Figure 2 As shown, a lens assembly 10 according to some embodiments of this application includes: a lens body 600; a carbon elemental film layer 100; and a coating layer 200, wherein the coating layer 200 is located between the lens body 600 and the carbon elemental film layer 100, and the coating layer 200 includes a first film layer 210 and a second film layer 220 stacked thereon, wherein the refractive index of the first film layer 210 is greater than the refractive index of the second film layer 220.

[0024] In this embodiment, the lens assembly 10 includes a lens body 600, a carbon element film layer 100, and a coating layer 200.

[0025] The coating layer 200 is located between the lens body 600 and the carbon film layer 100. The carbon film layer 100 and the coating layer 200 work together to increase the hardness of the lens body 600, improve the sand abrasion resistance of the lens assembly 10, and have an anti-scratch effect, which is beneficial to improving the performance of the lens assembly 10.

[0026] Furthermore, the coating layer 200 includes a first coating layer 210 and a second coating layer 220, which are stacked together. The first coating layer 210 and the second coating layer 220 have different refractive indices; specifically, the refractive index of the first coating layer 210 is greater than that of the second coating layer 220. That is, by setting coating layers with different refractive indices, the reflectivity of the lens assembly 10 to light can be reduced by utilizing the difference between high and low refractive indices, thereby improving the "ghosting" phenomenon generated when the camera module is shooting.

[0027] Optionally, the number of first film layers 210 is at least one, and the number of second film layers 220 is at least one. When both the number of first film layers 210 and second film layers 220 are multiple, the positions of the first film layers 210 and second film layers 220 can be set according to specific circumstances. For example, a second film layer 220 can be set between any two adjacent first film layers 210. For example, a first film layer 210 can be set between any two adjacent second film layers 220. For example, at least one second film layer 220 can be set between a portion of the multiple first film layers 210. For example, at least one first film layer 210 can be set between a portion of the multiple second film layers 220, and so on, etc., which will not be listed here.

[0028] In some embodiments, such as Figure 1 As shown, the lens assembly 10 further includes a hybrid film layer 300 disposed between the carbon elemental film layer 100 and the coating layer 200, wherein the hybrid film layer 300 contains Si-O bonds and carbon elemental.

[0029] In this embodiment, the structure of the lens assembly 10 is further defined such that the lens assembly 10 also includes a hybrid film layer 300, which is located between the carbon elemental film layer 100 and the coating layer 200.

[0030] Among them, the mixed film layer 300 contains Si-O bonds and carbon elemental, that is, a certain amount of silicon dioxide (SiO2) is doped in the carbon film layer. The mixed film layer 300 formed has a part where Si-O bonds and carbon (C) elemental coexist. Different ion source energies will form a part of hard silicon carbide (SiC) film layer (not shown in the figure).

[0031] The hybrid film layer 300, the carbon element film layer 100, and the coating layer 200 are combined to further enhance the hardness of the lens.

[0032] In some embodiments, the first film layer 210 includes a silicon nitride layer, and the second film layer 220 includes a silicon-aluminum mixture layer and / or a silicon oxynitride layer.

[0033] In this embodiment, the structures of the first film layer 210 and the second film layer 220 are further defined.

[0034] Optionally, the first film layer 210 includes a silicon nitride (Si3N4) layer.

[0035] Optionally, the second film layer 220 includes a silicon-aluminum mixture (SiOAl) layer and / or a silicon oxynitride (SiON) layer. That is, the second film layer 220 includes a silicon-aluminum mixture (SiOAl) layer. Alternatively, the second film layer 220 includes a silicon oxynitride (SiON) layer. Or, the second film layer 220 includes both a silicon-aluminum mixture (SiOAl) layer and a silicon oxynitride (SiON) layer.

[0036] It is understandable that the refractive index of the silicon nitride (Si3N4) layer is greater than that of the silicon-aluminum mixture (SiOAl) layer, and the refractive index of the silicon nitride (Si3N4) layer is greater than that of the silicon oxynitride (SiON) layer.

[0037] Optionally, the coating layer 200 includes a silicon nitride (Si3N4) layer and a silicon-aluminum mixture (SiOAl) layer.

[0038] Optionally, the coating layer 200 includes a silicon nitride (Si3N4) layer and a silicon oxynitride (SiON) layer.

[0039] Optionally, the coating layer 200 includes a silicon nitride (Si3N4) layer, a silicon oxynitride (SiON) layer, and a silicon-aluminum mixture (SiOAl) layer.

[0040] In some embodiments, such as Figure 1 and Figure 2 As shown, the lens assembly 10 also includes a waterproof layer 400 disposed on the side of the carbon elemental film layer 100 opposite to the coating layer 200.

[0041] In this embodiment, the structure of the lens assembly 10 is further defined such that the lens assembly 10 also includes a waterproof layer 400, which is disposed on the side of the carbon elemental film layer 100 opposite to the coating layer 200. The waterproof layer 400 has the functions of waterproofing and fingerprint resistance, giving the film surface a smooth effect. The waterproof layer 400 also protects other film layers, preventing water from flowing through the lens assembly 10 and entering the interior of the camera module. It has anti-fouling capabilities and can reduce the impact of scratches on the lens assembly 10 from other objects.

[0042] In some embodiments, the waterproof layer 400 is an anti-fingerprint layer.

[0043] In this embodiment, the structure of the waterproof layer 400 is further defined so that the waterproof layer 400 is an anti-fingerprint (AF) layer to meet the waterproof and anti-fingerprint requirements of the waterproof layer 400.

[0044] In some embodiments, such as Figure 1 and Figure 2As shown, the lens assembly 10 also includes: a base layer 500 disposed between the waterproof layer 400 and the carbon elemental film layer 100.

[0045] In this embodiment, the structure of the lens assembly 10 is further defined such that the lens assembly 10 also includes a base layer 500, which is located between the waterproof layer 400 and the carbon film layer 100. The function of the base layer 500 is to effectively bond the waterproof layer 400 and the carbon film layer 100 together, preventing the waterproof layer 400 from separating from the carbon film layer 100.

[0046] In some embodiments, the underlayer 500 includes a silicon dioxide layer.

[0047] In this embodiment, the structure of the underlayer 500 is further defined, such that the underlayer 500 includes a silica layer. The underlayer 500 enables the waterproof layer 400 and the carbon elemental film layer 100 to bond effectively. Specifically, the Si bonds in the silica layer have good bonding and adhesion effects with the carbon elemental (C) film layer, and the Si bonds can also bond with the OH groups in the waterproof layer 400. This allows the waterproof layer 400 and the carbon elemental film layer 100 to be firmly bonded together.

[0048] Optionally, the thickness of the 500-layer substrate can be greater than or equal to 1 nm and less than or equal to 10 nm. For example, the thickness of the 500-layer substrate can be 2 nm, 3 nm, 4 nm, 5 nm, 6 nm, 7 nm, 8 nm and 9 nm, etc., which will not be listed here.

[0049] Optionally, when the lens assembly 10 includes a carbon elemental film layer 100 but not a mixed film layer 300, the lens assembly 10 must include a base layer 500.

[0050] Optionally, when the lens assembly 10 includes a carbon elemental film layer 100 and a hybrid film layer 300, the lens assembly 10 may include an underlayer 500, or it may not include an underlayer 500. When the lens assembly 10 includes a carbon elemental film layer 100 and a hybrid film layer 300, and the lens assembly 10 does not include an underlayer 500, Si bonds can be bonded to the anti-fingerprint layer.

[0051] In some embodiments, the first membrane layer 210 is located between the second membrane layer 220 and the carbon elemental membrane layer 100; or the second membrane layer 220 is located between the first membrane layer 210 and the carbon elemental membrane layer 100.

[0052] In this embodiment, the positional relationship between the first membrane layer 210, the second membrane layer 220, and the carbon elemental membrane layer 100 is further defined. For example, the first membrane layer 210 is located between the second membrane layer 220 and the carbon elemental membrane layer 100. Alternatively, the second membrane layer 220 is located between the first membrane layer 210 and the carbon elemental membrane layer 100. That is, the positional relationship between the first membrane layer 210, the second membrane layer 220, and the carbon elemental membrane layer 100 can be set according to actual usage requirements.

[0053] A coating layer 200 is provided on the surface of the lens body 600, which enhances the structural strength of the lens assembly 10. It effectively supports and fixes the coating layer 200, the carbon elemental film layer 100, the undercoat 500, and the waterproof layer 400 located thereon, or effectively supports and fixes the coating layer 200, the carbon elemental film layer 100, the mixed film layer 300, the undercoat 500, and the waterproof layer 400 located thereon, or effectively supports and fixes the coating layer 200, the carbon elemental film layer 100, the mixed film layer 300, and the waterproof layer 400 located thereon.

[0054] Optionally, the lens body 600 includes a glass layer, a sapphire layer, etc., which will not be listed here.

[0055] A camera module according to some embodiments of this application includes: a lens assembly 10 as described in any of the above embodiments.

[0056] In this embodiment, the camera module includes a lens assembly 10.

[0057] The lens assembly 10 includes a carbon elemental film layer 100 and a coating layer 200.

[0058] The coating layer 200 is stacked on one side of the carbon elemental film layer 100. The carbon elemental film layer 100 and the coating layer 200 work together to increase the hardness of the lens assembly 10, improve the sand abrasion resistance of the lens assembly 10, and have an anti-scratch effect, which is beneficial to improving the performance of the lens assembly 10.

[0059] Furthermore, the coating layer 200 includes a first coating layer 210 and a second coating layer 220, which are stacked together. The first coating layer 210 and the second coating layer 220 have different refractive indices; specifically, the refractive index of the first coating layer 210 is greater than that of the second coating layer 220. That is, by setting coating layers with different refractive indices, the reflectivity of the lens assembly 10 to light can be reduced by utilizing the difference between high and low refractive indices, thereby improving the "ghosting" phenomenon generated when the camera module is shooting.

[0060] An electronic device according to some embodiments of the present application includes: a camera module as described in any of the above embodiments.

[0061] In this embodiment, the electronic device includes a camera module.

[0062] The camera module includes a lens assembly 10.

[0063] The lens assembly 10 includes a carbon elemental film layer 100 and a coating layer 200.

[0064] The coating layer 200 is stacked on one side of the carbon elemental film layer 100. The carbon elemental film layer 100 and the coating layer 200 work together to increase the hardness of the lens assembly 10, improve the sand abrasion resistance of the lens assembly 10, and have an anti-scratch effect, which is beneficial to improving the performance of the lens assembly 10.

[0065] Furthermore, the coating layer 200 includes a first coating layer 210 and a second coating layer 220, which are stacked together. The first coating layer 210 and the second coating layer 220 have different refractive indices; specifically, the refractive index of the first coating layer 210 is greater than that of the second coating layer 220. That is, by setting coating layers with different refractive indices, the reflectivity of the lens assembly 10 to light can be reduced by utilizing the difference between high and low refractive indices, thereby improving the "ghosting" phenomenon generated when the camera module is shooting.

[0066] Alternatively, the electronic device may be a mobile terminal such as a mobile phone, a wearable device, a tablet computer, a laptop computer, a mobile computer, an augmented reality device, a virtual reality device, an in-vehicle device, a drone, or a handheld game console, etc.

[0067] Optionally, the lens assembly 10 of this application can meet the requirements for reflectivity and hardness of the base film. The lens assembly 10 includes a carbon elemental (C) film layer and a coating layer 200. The coating layer 200 includes a silicon nitride (Si3N4) layer, a silicon oxynitride (SiON) layer, and a silicon-aluminum mixture (SiOAl) layer. The combination of the carbon elemental film layer 100 and the coating layer 200 can increase the hardness of the lens assembly 10, reaching the Mohs hardness standard of 6, improving the abrasion resistance of sand particles, and providing scratch resistance.

[0068] Carbon is a nonmetallic element with the chemical symbol C. It is stable at room temperature, does not readily react, and has extremely low toxicity to humans. It can even be safely ingested in the form of graphite or activated carbon. It is located in Group IVA of the second period of the periodic table. Carbon exists both as a free element (diamond, graphite, etc.) and as compounds (mainly carbonates of calcium, magnesium, and other electropositive elements). It exists as carbon dioxide, a small but extremely important component of the atmosphere.

[0069] The carbon atoms in organic compounds can be hybridized in three ways.

[0070] s and p represent subshells. The closer the atomic orbital of an electron is to the nucleus, the stronger the attraction force of the nucleus on the electron, and the lower the electron's energy.

[0071] sp3 hybridization: One s atom and three p atoms hybridize into four orbitals, pointing towards the four vertices of a regular tetrahedron, such as the carbon atoms in methane and ethane.

[0072] sp2 hybridization: One s orbital and two p orbitals hybridize into three orbitals, pointing towards the three vertices of an equilateral triangle. The remaining p orbital then forms its own bond. For example, in the carbon atom of ethylene, one double bond is formed by the hybrid orbital, and the other by the two p orbitals.

[0073] sp hybridization: One s and one p atom hybridize into two orbitals that lie in a straight line, while the remaining two p orbitals form bonds independently. For example, in the carbon atom of acetylene, one of the three bonds is formed by the hybrid orbital, and the other two are formed by the p orbitals.

[0074] Diamond is formed when carbon atoms form covalent bonds using sp3 hybrid orbitals.

[0075] Graphite is formed when carbon atoms form covalent bonds using sp2 hybrid orbitals.

[0076] When carbon atoms are hybridized using a mixture of sp2 and sp3 bonds, diamond-like carbon is formed.

[0077] Carbon-based thin films encompass many types, including graphite, diamond, amorphous carbon, and graphene. When the film is predominantly composed of sp2 hybrid bonds, it exhibits the characteristics of graphite. When the film is predominantly composed of sp3 hybrid bonds, it exhibits the characteristics of diamond, and is commonly referred to as diamond or diamond-like carbon film. Diamond films possess numerous excellent physicochemical properties, such as high hardness, low coefficient of friction, thermal conductivity, insulation, ultraviolet absorption, resistance to radiation damage, and corrosion resistance. Diamond films are classified into single-crystal, polycrystalline, and amorphous materials. Single-crystal and polycrystalline diamond materials are often formed at high temperatures, while diamond-like carbon films are metastable amorphous materials formed at room temperature. They can be further divided into hydrogen-containing diamond-like carbon films, which have even higher hardness. When the sp3 bond content reaches over 70%, it is called amorphous tetrahedral carbon. The main method for evaluating the quality of diamond films is to examine their sp3 content; the higher the content, the closer their properties are to those of natural diamond. The SP3 hybridization content reaches 87%, the film hardness HV≥85Gpa, the flatness is 0.2nm, and the friction coefficient is less than or equal to 0.08.

[0078] The silicon-aluminum hybrid (SiOAl) layer uses a customized target material with a Si to Al ratio of 95:5, or 90:10, etc., and the Si to Al ratio is not limited to these ratios. The carbon elemental film layer 100 increases the smoothness and hardness of the outer layer. The carbon elemental film layer 100 exists in a mixed state of sp2 and sp3, with an sp3 hybridization rate higher than 50%.

[0079] The lens assembly 10 includes a high-refractive-index silicon nitride (Si3N4) layer, a medium-refractive-index silicon oxynitride (SiON) layer, a silicon-aluminum mixture (SiOAl) layer, a low-refractive-index underlayer 500 (silicon dioxide layer), and a rigid carbon film layer 100. The rigidity of the lens assembly 10 is increased by stacking these three layers with different refractive indices. The refractive index and thickness of the film system (C) are adjusted to meet reflectivity requirements. The thickness of the carbon film layer 100 is greater than or equal to 8 nm and less than or equal to 12 nm. If the requirements for reflectivity and transmittance are reduced, the thickness of the carbon film layer 100 can be increased.

[0080] The lens assembly 10 includes a carbon elemental film layer 100, a coating layer 200, a base layer 500, and a waterproof layer 400.

[0081] The coating layer 200 includes a silicon nitride (Si3N4) layer, a silicon oxynitride (SiON) layer, and a silicon-aluminum mixture (SiOAl) layer to meet the requirements for basic hardness and reflectivity. The coating layer 200 can be stacked using any base material, and the number of layers is not limited. The carbon elemental film layer 100 can improve the film's hardness and smoothness, or both the carbon elemental film layer 100 and the mixed film layer 300 can improve the film's hardness and smoothness. The thickness of the carbon elemental film layer 100 and the mixed film layer 300 needs to be adjusted and controlled based on absorption, reflectivity, and other parameters.

[0082] like Figure 1 As shown, the lens assembly 10 includes a carbon elemental film layer 100 and a mixed film layer 300. A small amount of SiO2 is doped into the carbon film layer, resulting in a mixture of Si-O bonds and elemental carbon. Different ion source energies can lead to the formation of a partially hard SiC film layer (not shown in the figure). The carbon elemental film layer 100 and the mixed film layer 300 together constitute a hard C film. Figure 1 and Figure 2 The arrows in the diagram indicate the direction of light transmission.

[0083] like Figure 2 As shown, the carbon elemental film layer 100 requires high ion source energy to ionize C into finer particles, forming a higher content of amorphous SP3. The thickness of the carbon elemental film layer 100 is greater than or equal to 8 nm and less than or equal to 12 nm, balancing reflectivity and hardness. The thickness of the carbon elemental film layer 100 is not limited to the above range; if absorption or reflectivity requirements are not high, but hardness is required, the thickness of the carbon elemental film layer 100 can be appropriately increased.

[0084] The purpose of the undercoat 500 is to effectively bond the carbon elemental film layer 100 and the waterproof layer 400. The Si bonds in the undercoat 500 have good bonding and adhesion with the carbon elemental (C) film layer, and the Si bonds can also bond with the OH groups in the waterproof layer 400. If the lens assembly 10 includes a mixed film layer 300 and a carbon elemental film layer 100, the lens assembly 10 may not include the undercoat 500.

[0085] Waterproof layer 400 includes an anti-fingerprint layer. Waterproof layer 400 serves to waterproof and prevent fingerprints. Waterproof layer 400 includes a perfluoropolyether-based main agent. The thickness of waterproof layer 400 includes, but is not limited to, greater than 750 nm.

[0086] The coating layer 200 is deposited by magnetron sputtering equipment, including but not limited to PECVD (plasma-enhanced chemical vapor deposition), CVD (chemical vapor deposition), and multi-arc ion plating, which has good density and high hardness.

[0087] The carbon elemental film layer 100 primarily utilizes a High Power Impulse Magnetron Sputtering (HIPIMS) power supply. HIPIMS is a high-power pulsed power supply used for thin film deposition. Its basic principle is to generate a high-energy ion beam by instantaneously applying a high voltage, thereby enhancing the sputtering of material on the target surface and producing higher-quality films. The core of the HIPIMS power supply is a circuit with multiple switching transistors that can generate high-voltage pulses in an extremely short time. These high-voltage pulses increase the ionization degree of the target surface, thus increasing the sputtering rate and energy. Because the pulse width generated by the HIPIMS power supply is very narrow (typically between several microseconds and tens of nanoseconds), the generated ion beam has very high energy and power densities. Using HIPIMS for thin film deposition can produce higher-quality films. This is because the high-energy ion beam can improve the film's density, hardness, adhesion, and other properties, and allows for control over the film's composition and crystal structure. Furthermore, HIPIMS can effectively reduce impurity generation and gas contamination, improving deposition efficiency. In summary, HIPIMS power supplies enhance material sputtering on the target surface by generating high-power pulsed voltages, thereby achieving higher-quality thin film deposition. C films deposited using HIPIMS power supply equipment can achieve a high sp3 hybridization rate, enabling the film to reach diamond-like hardness. To achieve even harder films, the sp3 ratio of C atoms in the C-containing film needs to be higher than 60%.

[0088] The lens body 600 includes a glass layer, a sapphire layer, etc., which will not be listed here. The surface of the glass layer can be strengthened to increase the hardness of the glass matrix. Surface polishing can increase the smoothness of the glass layer surface.

[0089] The maximum reflectance of the carbon elemental film layer 100 and the coating layer 200 in the visible light region (420nm-680nm) is less than 4%.

[0090] The maximum reflectance of the carbon elemental film layer 100, the coating layer 200, and the hybrid film layer 300 in the visible light region (420nm-680nm) is less than 4%.

[0091] The lens has a Mohs hardness of 6, which meets the requirement of being scratch-free.

[0092] like Figure 1 and Figure 2 As shown, d1, d2, ..., dn represent the physical thickness of the corresponding layers. 1, 2...n represent the corresponding layer numbers. The refractive index of the silicon nitride (Si3N4) layer is 1.99-2.09 at 550 nm, the refractive index of the silicon oxynitride (SiON) layer is 1.50-1.6 at 550 nm, and the refractive index of the silicon-aluminum mixture (SiOAl) layer is 1.48-1.6 at 550 nm. The refractive index of the carbon elemental film layer 100 is between 1.8 and 2.1, with higher refractive index due to the greater amorphous content. The carbon elemental film layer 100 requires a high-frequency pulsed power supply; H2 can be added to suppress the formation of SP2 bonds and promote the conversion to SP3 bonds. The outermost layer is a waterproof membrane.

[0093] The lens assembly 10 of this application exhibits abrasion resistance that meets the requirements of over 4000 cycles of steel wool abrasion. A Mohs hardness of 6 indicates no scratches or only minor scratches. Its sand abrasion resistance meets the requirements of 150 cycles.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A lens assembly, characterized in that, include: Lens body; Carbon elemental membrane layer; A coating layer is located between the lens body and the carbon elemental film layer. The coating layer includes a first film layer and a second film layer stacked together, wherein the refractive index of the first film layer is greater than the refractive index of the second film layer. The first film layer includes a silicon nitride layer, and the second film layer includes a silicon-aluminum mixture layer and / or a silicon oxynitride layer; A hybrid film layer is disposed between the carbon elemental film layer and the coating layer, wherein the hybrid film layer contains Si-O bonds and carbon elemental matter; A waterproof layer is provided on the side of the carbon elemental film layer that is opposite to the coating layer; A base layer is disposed between the waterproof layer and the carbon elemental film layer, and the base layer includes a silicon dioxide layer.

2. The lens assembly according to claim 1, characterized in that, The waterproof layer is a fingerprint-resistant layer.

3. The lens assembly according to claim 1 or 2, characterized in that, The first membrane layer is located between the second membrane layer and the carbon elemental membrane layer; or The second membrane layer is located between the first membrane layer and the carbon elemental membrane layer.

4. A camera module, characterized in that, include: The lens assembly as described in any one of claims 1 to 3.

5. An electronic device, characterized in that, include: The camera module as described in claim 4.

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