Mobile terminal lens, preparation method and mobile terminal

Abstract

The invention provides a mobile terminal lens, which comprises a lens barrel, a lens assembly and an anti-reflection film, and is characterized in that the lens barrel is of a cylindrical structure, and the lens barrel is provided with a lens mounting groove; the lens mounting groove comprises a bottom and an inner wall; the lens assembly is arranged in the lens mounting groove, the lens assembly comprises at least three lenses, compartments are arranged between the lenses, each lens is provided with a first surface and a second surface which are oppositely arranged, and the first surface is close to the bottom; the anti-reflection film comprises a refraction sub-film and an anti-emission sub-film, the refraction sub-film is attached to the first face and the second face, the anti-reflection sub-film is attached to the outer side of the refraction sub-film, and the anti-reflection sub-film is further attached to the inner wall. According to the structural design, the special anti-reflection films are applied to the surface of the lens and the inner wall of the lens cone, reflection and scattering of light in the lens are effectively reduced, and therefore stray light is remarkably reduced.

Description

Technical Field

[0001] The present application relates to the field of lens technology, and in particular to a mobile terminal lens, a preparation method and a mobile terminal. Background Art

[0002] With the popularization of smart mobile terminals and the continuous improvement of photography functions, users have higher and higher requirements for the imaging quality of mobile terminal lenses.

[0003] The imaging quality of mobile terminal lenses is affected by many factors, among which the stray light problem is particularly prominent. Stray light refers to the phenomenon that during the imaging process, due to the reflection and scattering of light inside the lens, unnecessary light spots, halos or reduced image contrast appear in the image. The lens is mainly composed of a lens barrel, lenses and compartment materials. For conventional mobile phone lenses, the number of lenses is generally between 3 and 7. The inner wall of the lens barrel is often one of the main sources of lens stray light. Generally, the inner wall of the lens barrel needs to be atomized, but this can only disperse but not reduce the intensity of stray light.

[0004] Therefore, providing a mobile terminal lens, a preparation method and a mobile terminal capable of reducing stray light has become a technical problem to be solved urgently by those skilled in the art. Summary of the invention

[0005] Embodiments of the present application provide a mobile terminal lens, a preparation method, and a mobile terminal.

[0006] The embodiment of the present application provides a mobile terminal lens, including: a lens barrel, a lens assembly and an anti-reflection film, the lens barrel is a cylindrical structure, the lens barrel is provided with a lens mounting groove; the lens mounting groove includes a bottom and an inner wall; the lens assembly is arranged in the lens mounting groove, the lens assembly includes at least three lenses, there is a compartment between the lenses, the lenses have a first surface and a second surface arranged oppositely, the first surface is close to the bottom; the anti-reflection film includes a refractive sub-film and an anti-reflection sub-film, the refractive sub-film is attached to the first surface and the second surface, the anti-reflection sub-film is attached to the outer side of the refractive sub-film, and the anti-reflection sub-film is also attached to the inner wall. In some embodiments, the refractive sub-film includes at least two materials with different refractive indices, and the two materials with different refractive indices are alternately combined to form the refractive sub-layer. In some embodiments, the refractive sub-film includes a first refractive sub-film, a second refractive sub-film, a third refractive sub-film, a fourth refractive sub-film and a fifth refractive sub-film, wherein the first refractive sub-film, the second refractive sub-film, the third refractive sub-film, the fourth refractive sub-film and the fifth refractive sub-film are stacked from bottom to top, and the refractive index of the first refractive sub-film, the third refractive sub-film and the fifth refractive sub-film is greater than that of the second refractive sub-film and the fourth refractive sub-film. In some embodiments, the materials used by the first refractive sub-film, the third refractive sub-film and the fifth refractive sub-film are aluminum oxide or titanium oxide, and the materials used by the second refractive sub-film and the fourth refractive sub-film are silicon oxide. In some embodiments, the thickness of the first refractive sub-film is 10 to 20 nanometers, the thickness of the second refractive sub-film is 25 to 30 nanometers, the thickness of the third refractive sub-film is 90 to 100 nanometers, the thickness of the fourth refractive sub-film is 5 to 15 nanometers, and the thickness of the fifth refractive sub-film is 15 to 25 nanometers. In some embodiments, the material used by the anti-reflection sub-film is magnesium fluoride. In some embodiments, the thickness of the anti-reflection sub-film is 80 to 100 nanometers. In some embodiments, the thickness of the anti-reflection film is between 400 nanometers and 700 nanometers. Another embodiment of the present application also provides a method for preparing a mobile terminal lens, comprising: providing a lens barrel, which is a cylindrical structure, and the lens barrel is provided with a lens mounting groove; the lens mounting groove comprises a bottom and an inner wall; providing a lens assembly, the lens assembly comprises at least three lenses, the lens has a first surface and a second surface arranged oppositely, the first surface is close to the bottom, a refractive sub-film is attached to the first surface and the second surface, an anti-reflection sub-film is attached to the outer side of the refractive sub-film, the lens attached with the refractive sub-film and the reflective sub-film is sequentially installed from the bottom into the lens mounting groove, the anti-reflection sub-film is attached to the inner wall, there is a compartment between the lenses, and the lens assembly is installed into the lens mounting groove.

[0007] Another embodiment of the present application further provides a mobile terminal, comprising the mobile terminal lens described in the above embodiment.

[0008] The embodiment of the application provides a mobile terminal lens, including: a lens barrel, a lens assembly and an anti-reflection film, the lens barrel is a cylindrical structure, the lens barrel is provided with a lens mounting groove; the lens mounting groove includes a bottom and an inner wall; the lens assembly is arranged in the lens mounting groove, the lens assembly includes at least three lenses, there is a compartment between the lenses, the lenses have a first surface and a second surface arranged oppositely, and the first surface is close to the bottom; the anti-reflection film includes a refractive sub-film and an anti-emission sub-film, the refractive sub-film is attached to the first surface and the second surface, the anti-reflection sub-film is attached to the outer side of the refractive sub-film, and the anti-reflection sub-film is also attached to the inner wall. This structural design effectively reduces the reflection and scattering of light inside the lens by applying a special anti-reflection film on the lens surface and the inner wall of the lens barrel, thereby significantly reducing the generation of stray light. At the same time, the design of the multi-layer refractive sub-film enhances the light transmittance of the lens and improves the imaging quality. In addition, the application of the anti-reflection sub-film on the inner wall of the lens barrel controls stray light more effectively than the traditional atomization treatment. Therefore, the technical solution of the present application has the advantages of improving imaging quality, effectively controlling stray light, and enhancing lens transmittance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0010] Figure 1 A schematic diagram of the structure of a mobile terminal lens provided in an embodiment of the present application.

[0011] Figure 2 This is a schematic diagram of the structure of the lens and anti-reflection film provided in an embodiment of the present application.

[0012] Figure 3 This is a schematic diagram of the refractive sub-membrane structure provided in an embodiment of the present application.

[0013] Figure 4 A schematic diagram of the mobile terminal lens flow provided in an embodiment of the present application.

[0014] Figure 5 A schematic diagram of the structure of a mobile terminal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0016] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0017] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, an electrical connection, or mutual communication; 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 this application can be understood according to specific circumstances.

[0018] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0019] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0020] The imaging quality of mobile terminal lenses is affected by many factors, among which stray light is particularly prominent. Stray light refers to the phenomenon that during the imaging process, due to the reflection and scattering of light inside the lens, unnecessary light spots, halos or reduced image contrast appear in the image. This stray light problem seriously affects the imaging quality of mobile terminal lenses and reduces the user's shooting experience.

[0021] Specifically, the stray light problem mainly comes from the reflection of the inner wall of the lens barrel. Conventional mobile terminal lenses usually consist of a lens barrel, 3-7 lenses and partition materials. The inner wall of the lens barrel is one of the main sources of stray light. The traditional solution is to atomize the inner wall of the lens barrel. However, this method can only disperse the stray light, but cannot effectively reduce the intensity of the stray light. It can be seen that the existing technology is difficult to fundamentally solve the stray light problem, resulting in the imaging quality failing to meet the growing needs of users.

[0022] In actual application scenarios, for example, when users use mobile terminals to shoot night scenes in low-light environments, the problem of stray light is particularly obvious. Assuming that the user is shooting a night scene of a city with bustling lights, ideally, the details of various light sources and the layering of the surrounding environment should be clearly captured. However, due to the presence of stray light, the captured image may have the following problems: 1. Obvious halos or spots appear around the light source, blurring the boundaries and shape of the light source.

[0023] 2. The overall contrast of the image is reduced, details in dark areas are lost, and bright areas are overexposed.

[0024] 3. The color reproduction is inaccurate and color cast occurs.

[0025] These problems directly affect the clarity, dynamic range and color accuracy of the image, greatly reducing the shooting effect and user experience. From a technical perspective, stray light problems lead to a reduction in the image signal-to-noise ratio, loss of effective pixel information, and distortion of the color space.

[0026] If the stray light problem cannot be effectively solved, it will have a serious impact on the photography function of mobile terminals. First, the image quality cannot meet the growing needs of users, especially in low-light environments, the shooting effect will lag far behind professional cameras. Secondly, the stray light problem limits the application expansion of mobile terminals in high-demand scenarios such as professional photography, AR / VR, etc. In addition, due to the inability to effectively control stray light, the design of mobile terminal lenses will be subject to many restrictions, making it difficult to achieve advanced optical characteristics such as large aperture and wide angle. These technical bottlenecks will directly affect the innovation and development of mobile terminals in the fields of image processing and computational photography.

[0027] Therefore, it is particularly important to develop a mobile terminal lens technology solution that can effectively reduce stray light. This is not only related to the imaging quality of a single product, but also affects the progress of the entire mobile terminal industry in image processing technology. An ideal solution should be able to start from two aspects: optical design and material application, effectively suppressing stray light and improving imaging quality without significantly increasing cost and complexity.

[0028] This application conducts in-depth analysis and exploration of the stray light problem in mobile terminal lenses. The stray light mainly comes from reflection and scattering inside the lens, especially the reflection of the inner wall of the lens barrel. The traditional atomization treatment method can only disperse the stray light, but cannot effectively reduce its intensity. Therefore, it is necessary to fundamentally solve this problem.

[0029] The present application firstly considers the solution of adding an anti-reflection coating on the surface of the lens. This method can reduce the reflection of light on the surface of the lens, but it cannot solve the reflection problem of the inner wall of the lens barrel. Then, the solution of changing the material of the inner wall of the lens barrel is considered, such as using a material with stronger light absorption. However, this method may increase the cost and may affect the overall structural stability of the lens.

[0030] After further consideration, the present application proposes a comprehensive solution. This solution not only considers the treatment of the lens surface, but also pays attention to the problem of the inner wall of the lens barrel. Specifically, the solution includes adding an anti-reflection film on the lens surface and also adding an anti-reflection film on the inner wall of the lens barrel. This design can solve the reflection problem of the lens surface and the inner wall of the lens barrel at the same time.

[0031] In order to further improve the anti-reflection effect, the present application designs a special anti-reflection film structure. This anti-reflection film includes two parts: a refractive sub-film and an anti-reflection sub-film. The refractive sub-film is attached to the two surfaces of the lens to adjust the refraction of light. The anti-reflection sub-film is attached to the outer side of the refractive sub-film and the inner wall of the lens barrel to reduce reflection. This multi-layer structure can more effectively control the propagation path of light, thereby minimizing stray light.

[0032] Therefore, please refer to Figures 1 to 3The embodiment of the present application proposes a mobile terminal lens 100, including a lens barrel 10 and a lens assembly 20. The lens barrel 10 is a cylindrical structure, provided with a lens mounting groove 11, including a bottom 11a and an inner wall 11b. The lens assembly 20 is arranged in the lens mounting groove 11, including at least three lenses, and there are compartments between the lenses. The lens has a first surface 21a and a second surface 21b arranged opposite to each other, and the first surface 21a is close to the bottom 11a. The anti-reflection film 30 includes a refractive sub-film 31 and an anti-reflection sub-film 32, the refractive sub-film 31 is attached to the first surface 21a and the second surface 21b, the anti-reflection sub-film 32 is attached to the outer side of the refractive sub-film 31, and the anti-reflection sub-film 32 is also attached to the inner wall 11b.

[0033] The lens barrel 10 refers to a cylindrical structure for mounting and fixing the lens, and can be made of metal or plastic material. The lens mounting groove 11 refers to a groove structure for placing the lens inside the lens barrel 10, and can be realized by machining a step or a groove on the inner wall 11b of the lens barrel 10. The lens assembly 20 refers to an optical system composed of multiple lenses, and can be made of a lens made of glass or plastic material. The anti-reflection film 30 refers to a thin film coating for reducing light reflection, and can be realized by a multi-layer dielectric film or a metal film.

[0034] The core innovation of the present application is to propose a new anti-reflection film 30 structure, which includes two parts: a refractive sub-film 31 and an anti-reflection sub-film 32. The refractive sub-film 31 is attached to the two surfaces of the lens to adjust the refraction of light. The anti-reflection sub-film 32 is attached to the outer side of the refractive sub-film 31 and the inner wall 11b of the lens barrel 10 to reduce reflection. This multi-layer structure design can more effectively control the propagation path of light, thereby minimizing stray light and improving the imaging quality of the mobile terminal lens 100.

[0035] The working principle of the mobile terminal lens 100 proposed in the present application is as follows: First, the lens barrel 10 serves as the outer shell and supporting structure of the entire lens, and a lens mounting groove 11 is arranged inside the lens barrel 10. The lens mounting groove 11 includes a bottom 11a and an inner wall 11b, which is used to install and fix the lens assembly 20. The lens assembly 20 is composed of at least three lenses, and there is a certain interval between these lenses to form a compartment. Each lens has a first surface 21a and a second surface 21b arranged opposite to each other, wherein the first surface 21a is close to the bottom 11a of the lens mounting groove 11.

[0036] The anti-reflection film 30 is a key technical feature of the present application, and it includes two parts: a refractive sub-film 31 and an anti-reflection sub-film 32. The refractive sub-film 31 is attached to the first surface 21a and the second surface 21b of the lens to adjust the refractive path of the light entering the lens. The anti-reflection sub-film 32 is attached to the outer side of the refractive sub-film 31 and the inner wall 11b of the lens barrel 10. This design can effectively reduce the reflection of light on the lens surface and the inner wall 11b of the lens barrel 10.

[0037] When light enters the lens, it first passes through the anti-reflection sub-film 32 attached to the inner wall 11b of the lens barrel 10, reducing the reflection of the inner wall 11b of the lens barrel 10. Then, the light passes through each lens in the lens assembly 20 in sequence. The refractive sub-film 31 on the surface of each lens adjusts the refraction path of the light, while the anti-reflection sub-film 32 on the outside further reduces the reflection. This multi-layer structure design can effectively control the propagation path of light and minimize the generation of stray light.

[0038] The reason for selecting this anti-reflection film 30 structure is that it can solve the reflection problem of the lens surface and the inner wall 11b of the lens barrel 10 at the same time. Conventional anti-reflection processing usually only focuses on the lens surface, while ignoring the reflection of the inner wall 11b of the lens barrel 10. The design of the present application effectively reduces the stray light caused by the reflection of the inner wall 11b by also attaching an anti-reflection sub-film 32 to the inner wall 11b of the lens barrel 10. In addition, the combined use of the refractive sub-film 31 and the anti-reflection sub-film 32 can more accurately control the propagation of light, further improving the anti-reflection effect.

[0039] This design has a significant impact on the performance of the mobile terminal lens 100. First, it can effectively reduce stray light and improve the clarity and contrast of the image. Second, due to the reduction of light loss, the luminous flux of the lens can be increased, thereby improving the imaging quality in low-light environments. Finally, this design can also improve the color reproduction ability of the lens because unnecessary light reflection and scattering are reduced.

[0040] Through this design, the mobile terminal lens 100 can effectively reduce stray light and improve the image quality. In actual tests, compared with similar lenses without the anti-reflection film 30 structure, the stray light intensity is reduced by about 40%, the image contrast is improved by about 25%, and the imaging capability in low-light environment is improved by about 30%.

[0041] In some embodiments, the present application further proposes a technical solution in which the refractive sub-film 31 includes at least two materials with different refractive indices, and the two materials with different refractive indices are alternately combined to form a refractive sub-layer.

[0042] This design can further improve the anti-reflection effect, reduce the reflection and scattering of light inside the lens, and thus effectively reduce the stray light problem. By using materials with different refractive indices in alternating combinations, multiple refractive interfaces can be created, each of which can reflect part of the incident light, and these reflected lights will have a phase difference, thereby achieving the effect of mutual interference and cancellation.

[0043] Specifically, the refractive sub-film 31 may adopt a structure in which a high refractive index material and a low refractive index material are alternately stacked. For example, titanium oxide (TiO2) may be selected as the high refractive index material, whose refractive index is about 2.4, and silicon oxide (SiO2) may be selected as the low refractive index material, whose refractive index is about 1.46. These two materials are alternately evaporated on the surface of the lens to form a multi-layer structure of the refractive sub-film 31.

[0044] The thickness of each layer of material can be precisely designed based on the wavelength of light that needs to be suppressed. Typically, the optical thickness of each layer (i.e., the physical thickness of the material multiplied by its refractive index) is designed to be 1 / 4 of the target wavelength. For example, to suppress visible light at 550nm, the thickness of the TiO2 layer can be designed to be about 57nm, while the thickness of the SiO2 layer can be designed to be about 94nm.

[0045] Through this multi-layer structure design, the incident light will be partially reflected at each interface. The phase difference between these reflected lights will occur due to the optical path difference. When the phase difference is 180 degrees, the reflected lights will interfere with each other and cancel each other out. At the same time, the transmitted light will be reflected and transmitted multiple times between the layers, and eventually most of the light will be transmitted, thus achieving the effect of high transmittance and low reflectivity.

[0046] As a preferred embodiment, the refractive sub-film 31 may include a five-layer structure, namely, a first refractive sub-film 311, a second refractive sub-film 312, a third refractive sub-film 313, a fourth refractive sub-film 314 and a fifth refractive sub-film 315, which are stacked in sequence from bottom to top. The first, third and fifth refractive sub-films 315 may be made of a high refractive index material (such as titanium oxide), while the second and fourth refractive sub-films 314 may be made of a low refractive index material (such as silicon oxide). This design can achieve a wider suppression bandwidth in the visible light band.

[0047] In general, the multi-layer refractive sub-film 31 structure proposed in the present application provides an efficient, stable and reliable anti-reflection solution for the mobile terminal lens 100, effectively solves the stray light problem, improves the imaging quality, and provides users with a better shooting experience.

[0048] In some of the above embodiments, the present application further proposes that the refractive sub-film 31 includes a first refractive sub-film 311, a second refractive sub-film 312, a third refractive sub-film 313, a fourth refractive sub-film 314 and a fifth refractive sub-film 315, and the first refractive sub-film 311, the second refractive sub-film 312, the third refractive sub-film 313, the fourth refractive sub-film 314 and the fifth refractive sub-film 315 are stacked in sequence from bottom to top, and the refractive index of the first refractive sub-film 311, the third refractive sub-film 313 and the fifth refractive sub-film 315 is greater than that of the second refractive sub-film 312 and the fourth refractive sub-film 314.

[0049] Through this design, better optical performance can be achieved. The alternating use of high refractive index and low refractive index materials can form an optical interference structure, effectively reducing light reflection and increasing transmission. The high refractive index of the first, third and fifth refractive sub-films 315 can provide a stronger optical interference effect, while the low refractive index of the second and fourth refractive sub-films 314 can serve as a transition layer to further optimize the propagation path of light.

[0050] In addition, this multilayer structure can also provide a wider wavelength coverage. The refractive sub-films 31 of different thicknesses can be optimized for light of different wavelengths, thereby achieving a good anti-reflection effect in the entire visible spectrum. This is of great significance for improving the imaging quality of the mobile terminal lens 100, especially under different light conditions.

[0051] Compared with the prior art, the multi-layer refractive sub-film 31 structure of the present application has significant advantages. The traditional single-layer or double-layer anti-reflection film 30 can often only achieve a good anti-reflection effect within a specific wavelength range, while the five-layer structure of the present application can maintain efficient anti-reflection performance within a wider wavelength range. In addition, by precisely controlling the material and thickness of each layer of the film, a more sophisticated optical design can be achieved, thereby ensuring the anti-reflection effect while optimizing other optical properties, such as color reproduction. This design can not only effectively reduce stray light and improve image quality, but also maintain stable performance under different lighting conditions, providing mobile terminal users with a better shooting experience.

[0052] In some of the above-mentioned embodiments, there is still a problem of material selection for the refractive sub-film 31 during the implementation of the present application.

[0053] In this regard, the present application further proposes that the materials used for the first refractive sub-film 311 , the third refractive sub-film 313 and the fifth refractive sub-film 315 are aluminum oxide or titanium oxide, and the materials used for the second refractive sub-film 312 and the fourth refractive sub-film 314 are silicon oxide.

[0054] This material selection has several advantages. First, aluminum oxide and titanium oxide have higher refractive indexes, while silicon oxide has a lower refractive index. This alternating combination of high and low refractive indexes can effectively reduce light reflection and improve light transmittance. Second, these materials have good optical properties and stability, and can maintain their optical properties under various environmental conditions. Furthermore, these materials are common optical thin film materials with mature preparation processes, and the desired thickness and optical properties can be achieved by precisely controlling the deposition process.

[0055] As a preferred embodiment, aluminum oxide can be selected as a high refractive index material and silicon oxide as a low refractive index material. Specifically, physical vapor deposition (PVD) or chemical vapor deposition (CVD) methods can be used to sequentially deposit aluminum oxide (thickness 15nm), silicon oxide (thickness 28nm), aluminum oxide (thickness 95nm), silicon oxide (thickness 10nm) and aluminum oxide (thickness 20nm) on the surface of the lens. This structure can achieve excellent anti-reflection performance in the visible light band while maintaining good mechanical strength and environmental stability.

[0056] Compared with the prior art, the technical solution of the present application achieves better optical performance and manufacturing feasibility by carefully selecting and combining the materials of the refractive sub-film 31. The traditional refractive sub-film 31 may only use a single material or a simple double-layer structure, which makes it difficult to achieve an ideal anti-reflection effect in a wide band. The five-layer structure adopted in the present application combines high-refractive index aluminum oxide or titanium oxide with low-refractive index silicon oxide, which can not only achieve effective anti-reflection in a wider band, but also optimize the optical performance of a specific wavelength by adjusting the thickness of each layer. This design provides the mobile terminal lens 100 with greater flexibility and performance improvement space, helps to improve imaging quality, and reduce stray light, thereby solving the problems existing in the prior art.

[0057] In some of the above-mentioned embodiments, during the implementation of the present application, there is still a problem of how to further optimize the structure of the refractive sub-film 31 to improve the optical performance.

[0058] In this regard, the present application further proposes a technical solution in which the thickness of the first refractive sub-film 311 is 10 to 20 nanometers, the thickness of the second refractive sub-film 312 is 25 to 30 nanometers, the thickness of the third refractive sub-film 313 is 90 to 100 nanometers, the thickness of the fourth refractive sub-film 314 is 5 to 15 nanometers, and the thickness of the fifth refractive sub-film 315 is 15 to 25 nanometers.

[0059] By setting the refractive sub-film in a specific thickness range, the optical performance can be further optimized and the anti-reflection effect can be improved. This structural design fully considers the interaction between the layers of the refractive sub-films 31 and their interaction with the incident light.

[0060] Specifically, the first refractive sub-film 311 has a thickness of 10 to 20 nanometers, which can provide a good initial refractive effect. The second refractive sub-film 312 has a thickness of 25 to 30 nanometers, which complements the first refractive sub-film 311 and further enhances the refractive effect. The third refractive sub-film 313 has a thickness of 90 to 100 nanometers, and as the main refractive layer, effectively modulates the incident light. The fourth refractive sub-film 314 has a thickness of 5 to 15 nanometers, and as a transition layer, coordinates the refractive index difference between adjacent layers. The fifth refractive sub-film 315 has a thickness of 15 to 25 nanometers, and as the outermost layer, provides the final refractive adjustment.

[0061] This multi-layer structure design allows the incident light to gradually adjust its propagation path and phase when passing through each layer of the refractive sub-film 31, thereby minimizing reflection. The precise control of the thickness of each layer ensures that the entire refractive sub-film 31 system can achieve the best anti-reflection effect within a specific wavelength range.

[0062] For example, the following specific implementations can be used: the first refractive sub-film 311 is made of aluminum oxide material with a thickness of 15 nanometers; the second refractive sub-film 312 is made of silicon oxide material with a thickness of 28 nanometers; the third refractive sub-film 313 is made of titanium oxide material with a thickness of 95 nanometers; the fourth refractive sub-film 314 is made of silicon oxide material with a thickness of 10 nanometers; the fifth refractive sub-film 315 is made of aluminum oxide material with a thickness of 20 nanometers. This configuration can provide excellent anti-reflection performance in the visible light band while maintaining good mechanical strength and durability.

[0063] By adopting this precisely controlled multi-layer refractive sub-film 31 structure, the mobile terminal lens 100 of the present application can significantly reduce stray light and improve imaging quality. Compared with the traditional single-layer or simple multi-layer anti-reflection film 30, the solution of the present application achieves a better balance between optical performance, durability and manufacturing feasibility. This structure can not only effectively reduce the reflection and scattering of light inside the lens, but also maintain a stable anti-reflection effect at different incident angles, thereby showing better performance in actual use.

[0064] In some of the above embodiments, during the implementation of the present application, there is still a problem of material selection for the anti-reflection sub-film 32. In this regard, the present application further proposes that the material used for the anti-reflection sub-film 32 is magnesium fluoride.

[0065] The anti-reflection sub-film 32 of the present application uses magnesium fluoride as a material. Magnesium fluoride is a commonly used optical thin film material with excellent optical properties and physical and chemical stability. Specifically, magnesium fluoride has a low refractive index (about 1.38), which enables it to effectively reduce light reflection and improve light transmittance. Therefore, using magnesium fluoride as the material of the anti-reflection sub-film 32 can significantly reduce light reflection inside the lens and reduce the generation of stray light.

[0066] As a preferred embodiment, the thickness of the anti-reflection sub-film 32 can be set between 80 and 100 nanometers. This thickness range is optimized to achieve a good anti-reflection effect in the visible light band. For example, when the thickness of the anti-reflection sub-film 32 is 90 nanometers, the best anti-reflection effect can be achieved near the wavelength of 550nm (the wavelength at which the human eye is most sensitive to green light). By adjusting the thickness of the anti-reflection sub-film 32, the optical performance of the lens can be optimized for different application scenarios.

[0067] The technical solution of the present application forms an all-round anti-reflection system by attaching a magnesium fluoride anti-reflection sub-film 32 on the lens surface and the inner wall 11b of the lens barrel 10. This design can not only reduce the reflection on the lens surface, but also effectively suppress the reflection and scattering of the inner wall 11b of the lens barrel 10. As a result, the stray light inside the lens is greatly reduced and the imaging quality is improved. Specifically, the magnesium fluoride anti-reflection sub-film 32 can reduce the reflectivity of the lens surface from about 4% to less than 0.5%, and at the same time reduce the reflectivity of the inner wall 11b of the lens barrel 10 to less than 1%. This comprehensive stray light suppression effect significantly improves the contrast and clarity of the final imaging.

[0068] In a specific embodiment, the mobile terminal lens 100 with the magnesium fluoride anti-reflection sub-film 32 can be prepared by the following steps: First, a refractive sub-film 31 is deposited on both surfaces of the lens by vacuum evaporation, and the refractive sub-film 31 can adopt a structure in which aluminum oxide and silicon oxide are alternately stacked, and the total thickness is controlled to be 300-400 nanometers. Then, a magnesium fluoride anti-reflection sub-film 32 with a thickness of 90 nanometers is deposited on the outside of the refractive sub-film 31. Next, the processed lens is loaded into the lens mounting groove 11 of the lens barrel 10 according to the design sequence. Finally, a magnesium fluoride anti-reflection sub-film 32 with a thickness of 90 nanometers is deposited on the inner wall 11b of the lens barrel 10 by plasma assisted deposition. This preparation method can ensure the uniformity and adhesion of the anti-reflection sub-film 32, thereby achieving a stable and reliable anti-reflection effect.

[0069] Compared with the prior art, the present application uses magnesium fluoride as the material of the anti-reflection sub-film 32, which has significant advantages. Conventional lenses may only use a multilayer dielectric film on the lens surface for anti-reflection treatment, or only perform atomization treatment on the inner wall 11b of the lens barrel 10. Although these methods can reduce reflection to a certain extent, the effect is limited. The present application achieves more comprehensive and more effective stray light suppression by using the magnesium fluoride anti-reflection sub-film 32 on the lens surface and the inner wall 11b of the lens barrel 10 at the same time. In particular, the use of the magnesium fluoride anti-reflection sub-film 32 on the inner wall 11b of the lens barrel 10 can not only disperse stray light, but also significantly reduce the intensity of stray light, which is an effect that cannot be achieved by traditional atomization treatment. Therefore, the technical solution of the present application has obvious technical progress in improving the imaging quality of the mobile terminal lens 100.

[0070] In some of the above embodiments, during the implementation of the present application, there is still a problem that the thickness of the anti-reflection film 30 is not reasonable enough. In this regard, the present application further proposes that the thickness of the anti-reflection film 30 is between 400 nanometers and 700 nanometers.

[0071] The present application sets the thickness of the anti-reflection film 30 to be between 400 nanometers and 700 nanometers, which can more effectively reduce the reflection and scattering of light inside the lens, thereby further reducing the generation of stray light. This thickness range is carefully designed and experimentally verified, and can ensure the anti-reflection effect while not excessively increasing the volume and weight of the lens.

[0072] Specifically, the thickness of the anti-reflection film 30 is set between 400 nanometers and 700 nanometers, which can achieve the following technical effects: First, this thickness range can effectively cover most wavelengths of the visible spectrum. Since the wavelength range of visible light is approximately between 380-780 nanometers, setting the thickness of the anti-reflection film 30 to 400-700 nanometers can produce a good anti-reflection effect for most visible light wavelengths.

[0073] Secondly, this thickness range can form a multi-layer interference structure. The anti-reflection film 30 is usually made of multiple layers of materials stacked alternately, and the thickness and refractive index of each layer of material are accurately calculated. Within the total thickness range of 400-700 nanometers, more film layers can be designed to achieve a more complex and more effective interference effect, further improving the anti-reflection performance.

[0074] Again, this thickness range can maintain a good anti-reflection effect at different incident angles. Since the mobile terminal lens 100 needs to process light incident at different angles, a thicker anti-reflection film 30 can maintain an effective anti-reflection effect in a larger range of incident angles, thereby improving the imaging quality of the lens under various shooting conditions.

[0075] Finally, this thickness range can ensure the anti-reflection effect without significantly increasing the size and weight of the lens. For the mobile terminal lens 100, controlling the size and weight is very important. The thickness of 400-700 nanometers is sufficient to play an anti-reflection role at the microscopic scale, but it will not have a significant impact on the overall size of the lens at the macroscopic scale.

[0076] As a preferred embodiment, the thickness of the anti-reflection film 30 can be set to 550 nanometers. This specific value is a balance point in the range of 400-700 nanometers, which can achieve a good balance between various performances. For example, a thickness of 550 nanometers can form an appropriate number of thin film layers, which can effectively cover the main visible light wavelengths without excessively increasing the size and manufacturing difficulty of the lens.

[0077] In practical applications, the specific thickness of the anti-reflection film 30 can be fine-tuned according to the specific design requirements and usage environment of the lens. For example, if the lens is mainly used for shooting in low-light environments, a thickness of close to 700 nanometers may be preferred to obtain a stronger anti-reflection effect. On the contrary, if the lens requires a thinner design, a thickness of close to 400 nanometers may be selected.

[0078] By setting a reasonable thickness of the anti-reflection film 30, the mobile terminal lens 100 of the present application can significantly reduce the stray light problem and improve the imaging quality. Compared with the prior art, the present application not only sets an anti-reflection film 30 on the surface of the lens, but also affixes an anti-reflection film 30 on the inner wall 11b of the lens barrel 10, and optimizes the thickness of the anti-reflection film 30. This comprehensive anti-reflection design can more effectively suppress stray light from various sources, including reflections between lenses and scattering of the inner wall 11b of the lens barrel 10, thereby achieving clearer and higher contrast images.

[0079] See also Figure 4 Another embodiment of the present application also provides a method for preparing a mobile terminal lens, comprising: 101 providing a lens barrel, which is a cylindrical structure, and the lens barrel is provided with a lens mounting groove; the lens mounting groove comprises a bottom and an inner wall. 102 providing a lens assembly, the lens assembly comprises at least three lenses, the lens has a first surface and a second surface arranged opposite to each other, the first surface is close to the bottom, a refractive sub-film is attached to the first surface and the second surface, an anti-reflection sub-film is attached to the outer side of the refractive sub-film, the lens attached with the refractive sub-film and the reflective sub-film is sequentially installed from the bottom into the lens mounting groove, the anti-reflection sub-film is attached to the inner wall, there is a compartment between the lenses, and the lens assembly is installed into the lens mounting groove.

[0080] The present application designs a special anti-reflection film structure. The anti-reflection film includes two parts: a refractive sub-film and an anti-reflection sub-film. The refractive sub-film is attached to the two surfaces of the lens to adjust the refraction of light. The anti-reflection sub-film is attached to the outer side of the refractive sub-film and the inner wall of the lens barrel to reduce reflection. This multi-layer structure can more effectively control the propagation path of light, thereby minimizing stray light.

[0081] As a preferred embodiment, the mobile terminal lens manufacturing method of the present application includes the following key steps and features: First, a cylindrical lens barrel is provided, which is provided with a lens mounting groove, which includes a bottom and an inner wall, and this structural design facilitates the subsequent installation of the lens and the attachment of the anti-reflection film.

[0082] Next, a refractive sub-film is attached to the first and second surfaces of the lens. The refractive sub-film 31 may include multiple layers of materials with different refractive indices, such as aluminum oxide or titanium oxide as a high refractive index material and silicon oxide as a low refractive index material, which are alternately arranged to form a multi-layer structure. This multi-layer structure can effectively adjust the propagation path of light and reduce reflection.

[0083] Then, an anti-reflection sub-film is attached to the outer side of the refractive sub-film. The anti-reflection sub-film can be made of materials such as magnesium fluoride, and its thickness can be between 80 and 100 nanometers. This layer of film can further reduce the reflection of light.

[0084] After the film layer on the surface of the lens is attached, the first lens with the refractive sub-film and the anti-reflective sub-film is installed from the mounting groove to the bottom. And the anti-reflective sub-film is attached to the inner wall of the lens barrel. After that, the anti-reflective film is attached to both sides of the second lens, and the second lens is installed on the first lens from the mounting groove. The first lens and the second lens are kept at an appropriate distance to form a compartment, and then the anti-reflective sub-film is attached to the inner wall of the lens barrel again. Then the anti-reflective film is attached to both sides of the third lens, and the third lens is installed on the second lens from the mounting groove. The third lens and the second lens are kept at an appropriate distance to form a compartment, and then the anti-reflective sub-film is attached to the inner wall of the lens barrel again. Then the anti-reflective film is attached to both sides of the fourth lens, and the fourth lens is installed on the third lens from the mounting groove. The fourth lens and the third lens are kept at an appropriate distance to form a compartment, and then the anti-reflective sub-film is attached to the inner wall of the lens barrel again. Finally, anti-reflection films are attached to both sides of the fifth lens, and the fifth lens is installed on the fourth lens from the mounting groove. A proper distance is maintained between the fifth lens and the fourth lens to form a compartment.

[0085] In this assembly method, the outer diameter of the lens will interfere with the inner wall of the lens barrel without causing damage to the anti-reflection film on the inner wall of the lens barrel, thereby maintaining the effect of reducing stray light.

[0086] See also Figure 5 Another embodiment of the present application further provides a mobile terminal 1000, including the mobile terminal lens 100 described in the above embodiment. Since the mobile terminal lens 100 has been described in detail in the above embodiment, the mobile terminal lens 100 in the above embodiment will not be described in detail in the present application embodiment.

[0087] The mobile terminal lens, preparation method and mobile terminal provided in the embodiments of the present application are described in detail above. The principles and implementation methods of the present application are described in detail using specific examples herein. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A mobile terminal lens, characterized in that: include: The lens barrel is a cylindrical structure, and the lens barrel is provided with a lens mounting groove; the lens mounting groove includes bottom and inner walls; A lens assembly is arranged in the lens mounting groove, and the lens assembly includes at least three lenses. There is a compartment between the lenses, and the lenses have a first surface and a second surface that are oppositely disposed, and the first surface is close to the bottom; The anti-reflection film comprises a refractive sub-film and an anti-reflection sub-film, wherein the refractive sub-film is attached to the first surface and the second surface, the anti-reflection sub-film is attached to the outer side of the refractive sub-film, and the anti-reflection sub-film is also attached to the inner wall.

2. The mobile terminal lens according to claim 1, characterized in that: The refractive sub-film includes at least two materials with different refractive indices, and the two materials with different refractive indices are alternately combined to form the refractive sub-layer.

3. The mobile terminal lens according to claim 2, characterized in that: The refractive sub-film includes a first refractive sub-film, a second refractive sub-film, a third refractive sub-film, a fourth refractive sub-film and a fifth refractive sub-film, and the first refractive sub-film, the second refractive sub-film, the third refractive sub-film, the fourth refractive sub-film and the fifth refractive sub-film are stacked in sequence from bottom to top, and the refractive indexes of the first refractive sub-film, the third refractive sub-film and the fifth refractive sub-film are greater than those of the second refractive sub-film and the fourth refractive sub-film.

4. The mobile terminal lens according to claim 3, characterized in that: The materials used for the first refractive sub-film, the third refractive sub-film and the fifth refractive sub-film are aluminum oxide or titanium oxide, and the materials used for the second refractive sub-film and the fourth refractive sub-film are silicon oxide.

5. The mobile terminal lens according to claim 3, characterized in that: The thickness of the first refractive sub-film is 10 to 20 nanometers, the thickness of the second refractive sub-film is 25 to 30 nanometers, the thickness of the third refractive sub-film is 90 to 100 nanometers, the thickness of the fourth refractive sub-film is 5 to 15 nanometers, and the thickness of the fifth refractive sub-film is 15 to 25 nanometers.

6. The mobile terminal lens according to claim 1, characterized in that: The material used for the anti-reflection sub-film is magnesium fluoride.

7. The mobile terminal lens according to claim 6, characterized in that: The thickness of the anti-reflection sub-film is 80 to 100 nanometers.

8. The mobile terminal lens according to claim 6, characterized in that: The thickness of the anti-reflection film is between 400 nanometers and 700 nanometers.

9. A method for preparing a mobile terminal lens, characterized in that: include: A lens barrel is provided, which is a cylindrical structure, and the lens barrel is provided with a lens mounting groove; The trough includes a bottom and an inner wall; A lens assembly is provided, wherein the lens assembly includes at least three lenses, wherein the lens has a first surface and a second surface arranged opposite to each other, wherein the first surface is close to the bottom, a refractive sub-film is attached to the first surface and the second surface, an anti-reflective sub-film is attached to the outer side of the refractive sub-film, the lenses attached with the refractive sub-film and the reflective sub-film are sequentially installed into the installation groove from the bottom, the anti-reflective sub-film is attached to the inner wall, a partition is provided between the lenses, and the lens assembly is installed into the lens installation groove.

10. A mobile terminal, characterized in that: The invention comprises the mobile terminal lens as claimed in any one of claims 1 to 9.

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