Optical lens and preparation method therefor, and electronic device

Abstract

An optical lens (100) and a preparation method therefor, and an electronic device. The optical lens (100) comprises an optical functional layer (2), a glass cover plate (1) and an anti-reflection film layer (3). The glass cover plate (1) is at least arranged on one side of the optical functional layer (2) in the thickness direction. The anti-reflection film layer (3) is formed on one side of the glass cover plate (1) away from the optical functional layer (2) in the thickness direction. The anti-reflection film layer (3) comprises a plurality of first anti-reflection film layers (31) and a plurality of second anti-reflection film layers (32), and the plurality of first anti-reflection film layers (31) and the plurality of second anti-reflection film layers (32) are alternately stacked in a direction away from the optical functional layer (2).

Description

Optical lens and preparation method thereof, and electronic device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on March 29, 2024, with application number 202410382031.1 and entitled “Optical lens, preparation method thereof, and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present disclosure relates to the field of optical imaging technology, and in particular to an optical lens, a preparation method thereof, and an electronic device. Background Art

[0004] As people's demand for the realism of virtual scenes continues to increase, aerial imaging technology has gradually attracted everyone's attention. Based on the equivalent negative refractive flat lens, the collected light source data is used through geometric models to realize the construction of real-life space.

[0005] In the visible light band (400nm~700nm), when light passes through the flat lens, the utilization rate of light is low, which affects the imaging effect of the flat lens and thus reduces the user's visual experience.

[0006] Public content

[0007] The present disclosure aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present disclosure is to provide an optical lens that, by providing an anti-reflection film layer, improves the light transmittance and light utilization rate of the optical lens, thereby improving the imaging effect of the optical lens and enhancing the user's visual experience.

[0008] Another object of the present disclosure is to provide a method for preparing an optical lens.

[0009] Another object of the present disclosure is to provide an electronic device using the above optical lens or an optical lens manufactured using the above optical lens manufacturing method.

[0010] According to an embodiment of the first aspect of the present disclosure, an optical lens includes: an optical functional layer; a glass cover plate, the glass cover plate being provided on at least one side of the optical functional layer in a thickness direction; an anti-reflection film layer, the anti-reflection film layer being formed on a side of the glass cover plate away from the optical functional layer in the thickness direction, the anti-reflection film layer including a plurality of first anti-reflection film layers and a plurality of second anti-reflection film layers, the plurality of first anti-reflection film layers and the plurality of second anti-reflection film layers being alternately stacked in a direction away from the optical functional layer.

[0011] According to the optical lens disclosed herein, the first anti-reflection film layer and the second anti-reflection film layer increase the transmittance of light, thereby making the anti-reflection film layer have high transmittance in the visible light band, and also reducing the reflected light on the surface of the glass cover plate, thereby improving the light transmittance and light utilization rate of the optical lens. For example, in the visible light band (400nm-700nm), the average light transmittance can reach 98.4%. This improves the imaging effect of the optical lens and also enhances the user's visual experience. Moreover, the anti-reflection film layer can protect the glass cover plate, thereby extending the service life of the optical lens.

[0012] According to some embodiments of the present disclosure, the bonding strength between the first anti-reflection film layer and the glass cover plate is greater than the bonding strength between the second anti-reflection film layer and the glass cover plate; and / or the refractive index of the first anti-reflection film layer is less than the refractive index of the second anti-reflection film layer.

[0013] According to some embodiments of the present disclosure, the first anti-reflection film layer is a silicon dioxide film layer; and / or the second anti-reflection film layer is a titanium dioxide film layer.

[0014] According to some embodiments of the present disclosure, the total number of layers of the plurality of first anti-reflection films and the plurality of second anti-reflection film layers is a, wherein a is an odd number; preferably, a satisfies: 5≤a≤11.

[0015] According to some embodiments of the present disclosure, the plurality of first anti-reflection film layers include n first anti-reflection film layers, which are arranged in the direction away from the optical functional layer, in order: the first first anti-reflection film layer, the second first anti-reflection film layer, the third first anti-reflection film layer... the n-1th first anti-reflection film layer and the nth first anti-reflection film layer, wherein the thickness of the first first anti-reflection film layer is d1, the thickness of the second first anti-reflection film layer is d2, the thickness of the third first anti-reflection film layer is d3, the thickness of the n-1th first anti-reflection film layer is d n-1 The thickness of the nth anti-reflection film layer is d n , where d1, d2, d3, d n-1 and d n Satisfies: d1 ≥ d n ≥d2 / d3 / d n-1 .

[0016] According to some embodiments of the present disclosure, when a=7, along the direction away from the optical functional layer, there are, in order, the first first anti-reflection film layer, the first second anti-reflection film layer, the second first anti-reflection film layer, the second second anti-reflection film layer, the third first anti-reflection film layer, the third second anti-reflection film layer, and the fourth first anti-reflection film layer. The thickness of the first first anti-reflection film layer is d1, wherein d1 satisfies: 139nm≤d1≤149nm; and / or, the thickness of the second first anti-reflection film layer is d2, wherein d2 satisfies: 31nm≤d2≤41nm; and / or, the thickness of the third first anti-reflection film layer is d3, wherein d3 satisfies: 6nm≤d3≤16nm; and / or, the thickness of the fourth first anti-reflection film layer is d4, wherein d4 satisfies: 81nm≤d4≤91nm; and / or, the thickness of the first second anti-reflection film layer is d5, wherein d5 satisfies: 7nm≤d5≤17nm; and / or, the thickness of the second second anti-reflection film layer is d6, wherein d6 satisfies: 55nm≤d6≤65nm; and / or, the thickness of the third second anti-reflection film layer is d7, wherein d7 satisfies: 29nm≤d7≤39nm.

[0017] According to the second aspect of the present disclosure, the preparation method of the optical lens of the embodiment comprises the following steps: S1: pre-treating the glass cover plate; S2: using an SI target, an intermediate frequency power supply, a power supply power of 35.9km~36.1kW, a single-layer film thickness of 67nm~77nm, and introducing 45sccm~55sccm of oxygen to form a first anti-reflection film layer on the glass cover plate pre-treated in S1, wherein the cumulative thickness of the first anti-reflection film layer is 139nm~149nm; S3: using a TIO target, an intermediate frequency power supply, a power supply power of 3.9km~4.1kW, a single-layer film thickness of 7nm~17 nm, introduce 15 sccm to 25 sccm of oxygen to form a second anti-reflection film layer, the cumulative thickness of the second anti-reflection film layer is 7nm to 17nm; S4: alternately repeat step S2 and step S3, control the power supply, power supply power, and gas volume in step S2 to control the single-layer film thickness of the first anti-reflection film layer and the cumulative thickness of the first anti-reflection film layer, and control the power supply, power supply power, and gas volume in step S3 to control the single-layer film thickness of the second anti-reflection film layer and the cumulative thickness of the second anti-reflection film layer; S5: finally, after fine extraction and rough extraction, take out the glass cover plate to complete the coating.

[0018] According to some embodiments of the present disclosure, the pretreatment includes rough pumping, fine pumping, and ion cleaning.

[0019] According to some embodiments of the present disclosure, when ion cleaning is performed, a low-power mode is adopted, and the power is P, where P satisfies: P≤1kW.

[0020] An electronic device according to an embodiment of the third aspect of the present disclosure includes: a display; an optical lens, wherein the optical lens is an optical lens according to the embodiment of the first aspect of the present disclosure or an optical lens manufactured according to the method for manufacturing an optical lens according to the embodiment of the second aspect of the present disclosure, and the optical lens collects light emitted from the display to form a floating real image on a side of the optical lens away from the display.

[0021] Additional aspects and advantages of the present disclosure will be given in part in the description that follows and, in part, will be obvious from the description that follows, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] FIG1 is a cross-sectional view of an optical lens according to an embodiment of the present disclosure;

[0024] FIG2 is a cross-sectional view of an anti-reflection film layer of an optical lens according to an embodiment of the present disclosure;

[0025] FIG3 shows the transmittance of an optical lens in different visible light bands according to an embodiment of the present disclosure, wherein the optical lens is not provided with an anti-reflection film layer;

[0026] FIG4 shows the transmittance of an optical lens in different visible light bands according to an embodiment of the present disclosure, wherein an anti-reflection film layer is provided on the optical lens;

[0027] FIG5 is a schematic diagram of assembling an optical functional layer and a glass cover of an optical lens according to an embodiment of the present disclosure;

[0028] FIG6 is a schematic diagram of a reflection unit of an optical lens according to an embodiment of the present disclosure;

[0029] 7 is a schematic diagram of a first light waveguide array and a second light waveguide array of an optical lens according to an embodiment of the present disclosure;

[0030] FIG8 is a schematic diagram of a reflective unit of an optical lens according to an embodiment of the present disclosure from another angle;

[0031] FIG9 is a schematic diagram of the floating real image imaging principle of the optical lens according to an embodiment of the present disclosure;

[0032] FIG10 is a schematic diagram of the light propagation principle of an optical lens according to an embodiment of the present disclosure;

[0033] FIG11 is a schematic diagram of a light propagation path of an optical lens according to an embodiment of the invention.

[0034] Figure numerals: 100, optical lens; 1, glass cover; 2, optical functional layer; 21, first optical waveguide array; 22, second optical waveguide array; 3, anti-reflection film layer; 31, first anti-reflection film layer; 32, second anti-reflection film layer; 4, reflection unit; 5, reflection film; 6, adhesive; 7, display light source. DETAILED DESCRIPTION

[0035] An embodiment of the present disclosure will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. An optical lens 100 according to an embodiment of the present disclosure will be described below with reference to FIG. 1 and FIG. 2 .

[0036] According to an embodiment of the first aspect of the present disclosure, the optical lens 100 , referring to FIG. 1 , includes an optical functional layer 2 , a glass cover plate 1 , and an anti-reflection film layer 3 .

[0037] Specifically, the glass cover plate 1 is provided on at least one side in the thickness direction of the optical functional layer 2 (for example, the up and down direction shown in FIG1 ). For example, in the example of FIG1 , the arrangement of the glass cover plate 1 includes the following situations: First, the glass cover plate 1 is located on the lower side of the optical functional layer 2. Second, the glass cover plate 1 is located on the upper side of the optical functional layer 2. Third, there are two glass cover plates 1, and the two glass cover plates 1 are respectively located on the upper side of the optical functional layer 2 and the lower side of the optical functional layer 2. In this arrangement, the glass cover plate 1 can protect the optical functional layer 2 and prevent the optical functional layer 2 from being damaged, thereby extending the service life of the optical functional layer 2 and further extending the service life of the optical lens 100. It should be noted that in the present application, there are two glass cover plates 1 and two optical functional layers 2, but this is not limited to this.

[0038] In conjunction with Figures 1 and 2 , the anti-reflection coating layer 3 is formed on the side of the glass cover plate 1 away from the optically functional layer 2 in the thickness direction (i.e., the vertical direction). The anti-reflection coating layer 3 includes multiple first anti-reflection coating layers 31 and multiple second anti-reflection coating layers 32, which are alternately stacked in a direction away from the optically functional layer 2. In the description of this disclosure, "multiple" means two or more. For example, in the examples of Figures 1 and 2 , the anti-reflection coating layer 3 is disposed in the following ways: First, when the glass cover plate 1 is located below the optically functional layer 2, the anti-reflection coating layer 3 is located on the lower side of the glass cover plate 1. Second, when the glass cover plate 1 is located above the optically functional layer 2, the anti-reflection coating layer 3 is located on the upper side of the glass cover plate 1. Third, when glass cover plates 1 are provided on both the upper and lower sides of the optically functional layer 2, the anti-reflection coating layer 3 is provided on the side of each glass cover plate 1 away from the optically functional layer 2.

[0039] The first anti-reflection film layer 31 and the second anti-reflection film layer 32 may be disposed in the following manner: First, the first anti-reflection film layer 31 is connected to the glass cover plate 1, and the second anti-reflection film layer 32 is connected to the first anti-reflection film layer 31 along a side away from the glass cover plate 1, and multiple first anti-reflection film layers 31 and multiple second anti-reflection film layers 32 are alternately stacked in a direction away from the optical functional layer 2. Second, the second anti-reflection film layer 32 is connected to the glass cover plate 1, and the first anti-reflection film layer 31 and the second anti-reflection film layer 32 are connected to a side away from the glass cover plate 1, and multiple second anti-reflection film layers 32 and multiple first anti-reflection film layers 31 are alternately stacked in a direction away from the optical functional layer 2.

[0040] With this configuration, the anti-reflection coating 3 exhibits high transmittance in the visible light band of 400nm to 700nm. While maintaining the optical performance of the optical functional layer 2 itself, it improves the light transmittance of the optical lens 100 and reduces light loss. Specifically, the first anti-reflection coating layer 31 and the second anti-reflection coating layer 32 can reduce reflected light from the surface of the glass cover plate 1 and increase the refractive index of the glass cover plate 1, thereby increasing the speed at which light passes through, thereby increasing light transmittance, improving the imaging effect of the optical lens 100, and enhancing the user's visual experience. Furthermore, the anti-reflection coating layer 3 also protects the glass cover plate 1, thereby preventing damage to the glass cover plate 1 and further extending the service life of the optical lens 100.

[0041] According to the optical lens 100 disclosed herein, the first anti-reflection film layer 31 and the second anti-reflection film layer 32 increase the transmittance of light, thereby making the anti-reflection film layer 3 have high transmittance in the visible light band, and also reducing the reflected light on the surface of the glass cover plate 1, thereby improving the light transmittance and light utilization rate of the optical lens 100. For example, in the visible light band (400nm-700nm), the average light transmittance can reach 98.4%. This improves the imaging effect of the optical lens 100 and also enhances the user's visual experience. Moreover, the anti-reflection film layer 3 can protect the glass cover plate 1, thereby extending the service life of the optical lens 100.

[0042] According to some embodiments of the present disclosure, the bonding strength between the first anti-reflection film layer 31 and the glass cover plate 1 is greater than the bonding strength between the second anti-reflection film layer 32 and the glass cover plate 1; and / or the refractive index of the first anti-reflection film layer 31 is less than the refractive index of the second anti-reflection film layer 32.

[0043] For example, the arrangement of the first anti-reflection film layer 31 and the second anti-reflection film layer 32 includes the following situations: first, the bonding strength between the first anti-reflection film layer 31 and the glass cover plate 1 is greater than the bonding strength between the second anti-reflection film layer 32 and the glass cover plate 1; second, the refractive index of the first anti-reflection film layer 31 is less than the refractive index of the second anti-reflection film layer 32; third, the bonding strength between the first anti-reflection film layer 31 and the glass cover plate 1 is greater than the bonding strength between the second anti-reflection film layer 32 and the glass cover plate 1, and at the same time, the refractive index of the first anti-reflection film layer 31 is less than the refractive index of the second anti-reflection film layer 32.

[0044] Therefore, the first anti-reflection film layer 31 is preferably connected to the side of the glass cover plate 1 away from the optical functional layer 2. The bonding strength of the first anti-reflection film layer 31 increases the connection strength between the anti-reflection film layer 3 and the glass cover plate 1, thereby preventing the anti-reflection film layer 3 from falling off the glass cover plate 1, thereby ensuring that the optical lens 100 can be used normally for a long time. In addition, the different reflection and refraction effects of visible light of different wavelengths at the interface between the first anti-reflection film layer 31 and the second anti-reflection film layer 32 can be utilized to ensure that the anti-reflection film layer 3 has a high transmittance for visible light, thereby improving the utilization rate of light and the transparency of the anti-reflection film layer 3, thereby improving the imaging effect of the optical lens 100.

[0045] According to some embodiments of the present disclosure, the first anti-reflection film layer 31 is a silicon dioxide film layer; and / or the second anti-reflection film layer 32 is a titanium dioxide film layer. For example, the configuration of the first anti-reflection film layer 31 and the second anti-reflection film layer 32 includes the following situations: first, the first anti-reflection film layer 31 is a silicon dioxide film layer; second, the second anti-reflection film layer 32 is a titanium dioxide film layer; third, the first anti-reflection film layer 31 is a silicon dioxide film layer, and the second anti-reflection film layer 32 is a titanium dioxide film layer. For example, the chemical properties of silicon dioxide are relatively stable, and silicon dioxide has high temperature resistance, corrosion resistance and unique optical properties, thereby extending the service life of the first anti-reflection film layer 31. Titanium dioxide has the advantages of stability, easy production and recycling, thereby improving the utilization rate of the second anti-reflection film layer 32. The refractive index of the silicon dioxide film layer is smaller than that of the titanium dioxide film layer, which creates a contrast between the first anti-reflection film layer 31 and the second anti-reflection film layer 32 , thereby enhancing the reflective ability of the anti-reflection film layer 3 and thus improving the transmittance of the anti-reflection film layer 3 .

[0046] According to some embodiments of the present disclosure, the total number of layers of the plurality of first anti-reflection coating layers 31 and the plurality of second anti-reflection coating layers 32 is a, where a is an odd number. Thus, in the film structure formed by the plurality of first anti-reflection coating layers 31 and the plurality of second anti-reflection coating layers 32, the first anti-reflection coating layer 31 serves as the starting layer, and another first anti-reflection coating layer 31 serves as the ending layer. This achieves a stable connection between the anti-reflection coating layer 3 and the glass cover 1, and extends the service life of the anti-reflection coating layer 3. Optionally, a is 3, 5, 7, 9, 11, 13, or 15, but is not limited thereto.

[0047] According to other embodiments of the present disclosure, a satisfies: 5≤a≤11. For example, when the total number of layers a of the plurality of first anti-reflection film layers 31 and the plurality of second anti-reflection film layers 32 is less than 5, the first anti-reflection film layers 31 and the second anti-reflection film layers 32 form a weaker interference effect, thereby affecting the light transmittance of the anti-reflection film layer 3. When the total number of layers a of the plurality of first anti-reflection film layers 31 and the plurality of second anti-reflection film layers 32 is greater than 11, the total number of layers of the plurality of first anti-reflection film layers 31 and the plurality of second anti-reflection film layers 32 increases, which increases the production cost of the anti-reflection film layer 3 and also increases the difficulty of production, thereby reducing the production efficiency of the anti-reflection film layer 3. In addition, after the total number of layers of the plurality of first anti-reflection film layers 31 and the plurality of second anti-reflection film layers 32 increases to a certain number, the performance improvement brought by each additional layer will become smaller and smaller. Thus, by setting the total number of layers, a, of the plurality of first anti-reflection coating layers 31 and the plurality of second anti-reflection coating layers 32 to satisfy the following: 5 ≤ a ≤ 11, where a is an odd number, the total number of layers of the plurality of first anti-reflection coating layers 31 and the plurality of second anti-reflection coating layers 32 is appropriately set, thereby enhancing the interference effect between the first anti-reflection coating layers 31 and the second anti-reflection coating layers 32 and thereby improving light transmittance. Furthermore, the production cost and difficulty of the anti-reflection coating layers 3 are reduced, and the production efficiency of the anti-reflection coating layers 3 is improved, thereby improving the production efficiency of the optical lens 100 and reducing the production cost of the optical lens 100. Optionally, a is 5, 7, 9, or 11.

[0048] According to some embodiments of the present disclosure, the plurality of first anti-reflection film layers 31 include n first anti-reflection film layers 31, which are arranged in the direction away from the optical functional layer 2, in order: the first first anti-reflection film layer 31, the second first anti-reflection film layer 31, the third first anti-reflection film layer 31, ... the n-1th first anti-reflection film layer 31 and the nth first anti-reflection film layer 31, wherein the thickness of the first first anti-reflection film layer 31 is d1, the thickness of the second first anti-reflection film layer 31 is d2, the thickness of the third first anti-reflection film layer 31 is d3, the thickness of the n-1th first anti-reflection film layer 31 is d n-1 The thickness of the nth first anti-reflection film layer 31 is d n , where d1, d2, d3, d n-1 and d n Satisfies: d1 ≥ d n ≥d2 / d3 / d n-1 .

[0049] For example, among the multiple first anti-reflection coating layers 31, the first anti-reflection coating layer 31 near the glass cover plate 1 (i.e., the first first anti-reflection coating layer 31) and the first anti-reflection coating layer 31 away from the glass cover plate 1 (i.e., the nth first anti-reflection coating layer 31) are thicker than the other first anti-reflection coating layers 31. With this arrangement, the nth first anti-reflection coating layer 31 is thicker and is located at the outermost side of the optical lens 100. This enhances the protective effect of the nth first anti-reflection coating layer 31 on the other layers of the anti-reflection coating layer 3, thereby extending the service life of the optical lens 100. Furthermore, the first first anti-reflection coating layer 31 is connected to the side of the glass cover plate 1 away from the optical functional layer 2 and has a greater thickness, further increasing the bonding strength between the first first anti-reflection coating layer 31 and the glass cover plate 1, thereby further improving the stability of the connection between the anti-reflection coating layer 3 and the glass cover plate 1 and enhancing the operational stability of the optical lens 100.

[0050] According to some embodiments of the present disclosure, when a=7, along the direction away from the optical functional layer 2, there are, in order, the first first anti-reflection film layer 31, the first second anti-reflection film layer 32, the second first anti-reflection film layer 31, the second second anti-reflection film layer 32, the third first anti-reflection film layer 31, the third second anti-reflection film layer 32 and the fourth first anti-reflection film layer 31. The thickness of the first first anti-reflection film layer 31 is d1, wherein d1 satisfies: 139nm≤d1≤149nm; and / or, the thickness of the second first anti-reflection film layer 31 is d2, wherein d2 satisfies: 31nm≤d2≤41nm; and / or, the thickness of the third first anti-reflection film layer 31 is d3, wherein d3 satisfies: 6nm≤d3≤16nm; and / or, the thickness of the fourth first anti-reflection film layer 31 is d4, wherein d4 satisfies: 81nm≤d4≤91nm; and / or, the thickness of the first second anti-reflection film layer 32 is d5, wherein d5 satisfies: 7nm≤d5≤17nm; and / or, the thickness of the second second anti-reflection film layer 32 is d6, wherein d6 satisfies: 55nm≤d6≤65nm; and / or, the thickness of the third second anti-reflection film layer 32 is d7, wherein d7 satisfies: 29nm≤d7≤39nm.

[0051] For example, when a=7, the arrangement of the plurality of first anti-reflection film layers 31 and the plurality of second anti-reflection film layers 32 includes the following situations: first, the thickness of the first first anti-reflection film layer 31 is d1, wherein d1 satisfies: 139nm≤d1≤149nm; second, the thickness of the second first anti-reflection film layer 31 is d2, wherein d2 satisfies: 31nm≤d2≤41nm; third, the thickness of the third first anti-reflection film layer 31 is d3, wherein d3 satisfies: 6nm≤d3≤16nm; fourth, the thickness of the fourth first anti-reflection film layer 31 is d4, wherein d4 satisfies: 81nm≤d4≤91nm; fifth, the thickness of the first second anti-reflection film layer 32 is d5, wherein d5 satisfies: 7nm≤d5≤17nm; sixth, the thickness of the second second anti-reflection film layer 32 is d6, wherein d6 satisfies: 55nm≤d6≤65nm m; Seventh, the thickness of the third second anti-reflection film layer 32 is d7, wherein d7 satisfies: 29nm≤d7≤39nm; Eighth, the thickness of the first first anti-reflection film layer 31 is d1, the thickness of the second first anti-reflection film layer 31 is d2, the thickness of the third first anti-reflection film layer 31 is d3, the thickness of the fourth first anti-reflection film layer 31 is d4, the thickness of the first second anti-reflection film layer 32 is d5, the thickness of the second second anti-reflection film layer 32 is d6, and the thickness of the third second anti-reflection film layer 32 is d7, wherein d1, d2, d3, d4, d5, d6 and d7 respectively satisfy: 139nm≤d1≤149nm, 31nm≤d2≤41nm, 6nm≤d3≤16nm, 81nm≤d4≤91nm, 7nm≤d5≤17nm, 55nm≤d6≤65nm, and 29nm≤d7≤39nm.

[0052] When the thickness of the first anti-reflection film layer 31 is large, the propagation path of visible light is increased, thereby increasing the scattering and absorption of visible light, and thus reducing the transmittance of the anti-reflection film layer 3 in the visible light range. When the thickness of the first anti-reflection film layer 31 is small, the effective interference generated between the first anti-reflection film layer 31 and the second anti-reflection film layer 32 cannot be satisfied, thereby reducing the transmittance of visible light, and thus reducing the light transmittance of the optical lens 100. When the thickness of the second anti-reflection film layer 32 is large, it may cause excessive reflection of visible light, thereby reducing the overall transmittance of the anti-reflection film layer 3 in the visible light range. Moreover, unnecessary optical losses may be caused. When the thickness of the second anti-reflection film layer 32 is small, the effective interference generated between the first anti-reflection film layer 31 and the second anti-reflection film layer 32 cannot be satisfied, thereby reducing the transmittance of visible light, and thus reducing the light transmittance of the optical lens 100. Thus, by setting the thickness d1 of the first anti-reflection film layer 31, the thickness d2 of the second first anti-reflection film layer 31, the thickness d3 of the third first anti-reflection film layer 31, the thickness d4 of the fourth first anti-reflection film layer 31, the thickness d5 of the first second anti-reflection film layer 32, the thickness d6 of the second second anti-reflection film layer 32 and the thickness d7 of the third second anti-reflection film layer 32, respectively, to satisfy: 139nm≤d1≤149nm, 31nm≤d2≤41nm, 6nm≤d3≤ When the thickness of the first anti-reflection film layers 31 and the thickness of the second anti-reflection film layers 32 are set appropriately, effective interference between the first anti-reflection film layers 31 and the second anti-reflection film layers 32 is achieved, thereby increasing the transmittance of visible light, thereby increasing the transmittance of the optical lens 100 and improving the imaging effect of the optical lens 100. Furthermore, a reasonable propagation path for visible light is achieved, thereby avoiding unnecessary optical losses and increasing the rate at which light passes through, thereby improving light utilization.

[0053] The method for preparing the optical lens 100 according to the second embodiment of the present disclosure includes the following steps:

[0054] S1: pre-treating the glass cover plate 1; S2: using an SI target, an intermediate frequency power supply, a power supply power of 35.9km~36.1kW, a single layer film thickness of 67nm~77nm, and introducing 45sccm~55sccm of oxygen to form a first anti-reflection film layer 31, the cumulative thickness of the first anti-reflection film layer 31 is 139nm~149nm; S3: using a TIO target, an intermediate frequency power supply, a power supply power of 3.9km~4.1kW, a single layer film thickness of 7nm~17nm, and introducing 15sccm~2 5sccm, to form a second anti-reflection film layer 32, the cumulative thickness of the second anti-reflection film layer 32 is 7nm-17nm; S4: step S2 and step S3 are repeated alternately, and the power supply, power supply power, and gas amount in step S2 are controlled to control the single-layer film thickness of the first anti-reflection film layer 31 and the cumulative thickness of the first anti-reflection film layer 31, and the power supply, power supply power, and gas amount in step S3 are controlled to control the single-layer film thickness of the second anti-reflection film layer 32 and the cumulative thickness of the second anti-reflection film layer 32; S5: finally, after fine extraction and rough extraction, the glass cover plate 1 is taken out to complete the coating.

[0055] For example, the steps of the method for preparing the optical lens 100 are as follows:

[0056] S1: The glass cover plate 1 is used as a substrate and is placed on a substrate rack of a coating device, and then the glass cover plate 1 is pretreated;

[0057] S2: The glass cover plate 1 pretreated in S1 is subjected to the above-mentioned first anti-reflection film 31 by using an SI target, a medium frequency power supply, a power supply of 36 kW, a single layer thickness of 72 nm, and an oxygen flow of 50 sccm. The cumulative thickness of the above-mentioned first anti-reflection film 31 is 144 nm.

[0058] S3: Using a TIO target, an intermediate frequency power supply, a power supply of 4 kW, a single layer thickness of 12 nm, and an oxygen flow of 20 sccm, the first second anti-reflection film 32 is formed. The cumulative thickness of the first second anti-reflection film 32 is 12 nm.

[0059] S4: Repeat steps S2 and S3 alternately. The repetition process is as follows:

[0060] S2-1: Using an SI target, an intermediate frequency power supply, and an 18 kW power supply, the single layer thickness is 36 nm, and an oxygen flow rate of 50 sccm is introduced to form the second first anti-reflection film 31. The cumulative thickness of the second first anti-reflection film 31 is 36 nm.

[0061] S3-1: Using a TIO target, an intermediate frequency power supply, a power supply of 24 kW, a single layer thickness of 60 nm, and an oxygen flow rate of 20 sccm, the second anti-reflection film 32 is formed. The cumulative thickness of the second anti-reflection film 32 is 60 nm.

[0062] S2-2: Using an SI target, an intermediate frequency power supply, and a power supply of 5.5 kW, a single layer thickness of 11 nm, and an oxygen flow rate of 50 sccm, the third first anti-reflection film 31 is formed. The cumulative thickness of the third first anti-reflection film 31 is 11 nm.

[0063] S3-2: Using a TIO target, an intermediate frequency power supply, and a power supply of 13.6 kW, a single layer thickness of 34 nm, and an oxygen flow rate of 20 sccm, the third second anti-reflection film 32 is formed. The cumulative thickness of the third second anti-reflection film 32 is 34 nm.

[0064] S2-3: Using an SI target, an intermediate frequency power supply, and a power supply of 21.5 kW, a single layer thickness of 43 nm, and an oxygen flow rate of 50 sccm, the fourth first anti-reflection film 31 is formed. The cumulative thickness of the fourth first anti-reflection film 31 is 86 nm.

[0065] S5: After fine drawing and rough drawing, the glass cover plate 1 is taken out and the coating is completed.

[0066] During the coating process, the coating thickness is controlled by changing the coating time. It should be noted that during the formation of the plurality of first anti-reflection film layers 31 and the plurality of second anti-reflection film layers 32, the power supply power, single layer film thickness, and oxygen supply are preferably the above values, but are not limited thereto.

[0067] Furthermore, the coated glass cover plate 1 is assembled with the optical functional layer 2 to form an optical lens 100 . The exemplary structure of the optical lens 100 is described above.

[0068] According to the preparation method of the specific embodiment of the present disclosure, by adopting the above-mentioned preparation method, the coating method of each layer of the anti-reflection film layer 3 is simple, thereby improving the production efficiency of the anti-reflection film layer 3 and reducing the production difficulty, thereby reducing the production cost of the anti-reflection film layer 3 and reducing the production cost of the optical lens 100.

[0069] According to some embodiments of the present disclosure, pretreatment includes rough pumping, fine pumping, and ion cleaning. During the pretreatment process, rough pumping is performed first, followed by fine pumping, and fine pumping starts ion cleaning. Rough pumping and fine pumping are to extract the air in the cavity in the coating device to control the vacuum degree in the above cavity according to the requirements of the preparation process, thereby improving the yield of the coating. Ion cleaning can process surface impurities and particle points on the glass cover plate 1, making it easy to coat the side of the glass cover plate 1 away from the optical functional layer 2, and also avoiding the surface impurities and particle points affecting the imaging of the optical lens 100, thereby improving the use stability and imaging effect of the optical lens 100.

[0070] According to some embodiments of the present disclosure, when ion cleaning is performed, a low-power mode is used, with a power of P, where P satisfies: P ≤ 1 kW. When the power p is greater than 1 kW, the power is relatively high, and during the cleaning process, the surface of the glass cover plate 1 is easily damaged, thereby affecting the imaging effect of the optical lens 100. Therefore, by setting the power P to satisfy: P ≤ 1 kW, the power setting is reasonable, avoiding damage to the surface of the glass cover plate 1, thereby preventing the imaging effect of the optical lens 100 from being affected.

[0071] As shown in Figures 3 and 4 below, Figure 3 shows the transmittance of the optical lens in the conventional technology (i.e., the optical lens without the anti-reflection film layer 3) in the visible light band (400nm to 700nm), with an average transmittance of 90.3%. Figure 4 shows the transmittance of the optical lens 100 in the present application (i.e., the optical lens 100 with the anti-reflection film layer 3) in the visible light band (400nm to 700nm), with an average transmittance of 98.4%, an increase of 8.1% in average transmittance. Moreover, the optical loss of the optical lens 100 is correspondingly reduced. Compared with the optical lens in the conventional technology, the light loss of the optical lens 100 is reduced by at least 6%.

[0072] An electronic device (not shown) according to an embodiment of the third aspect of the present disclosure includes a display (not shown) and an optical lens 100 .

[0073] Specifically, the optical lens 100 is an optical lens 100 manufactured according to the optical lens 100 of the first aspect embodiment of the present disclosure or the optical lens 100 manufactured according to the preparation method of the optical lens 100 of the second aspect embodiment of the present disclosure. The optical lens 100 collects the light emitted by the display and forms a floating real image on the side of the optical lens 100 away from the display.

[0074] According to the electronic device disclosed herein, the optical lens 100 or the optical lens 100 manufactured by the method for manufacturing the optical lens 100 improves the imaging effect of the floating imaging of the electronic device.

[0075] Optionally, the structure and imaging principle of the optical functional layer 2 in the present disclosure are described below with reference to FIG. 5 to FIG. 11 , and the specific contents are as follows.

[0076] According to some embodiments of the present disclosure, referring to FIG5 , the two optical functional layers 2 can be two optical waveguide unit arrays, respectively. Each glass cover plate 1 has two optical surfaces. The two optical waveguide unit arrays are arranged between the two glass cover plates 1, and the optical waveguide extension directions of the two optical waveguide unit arrays are arranged orthogonally. For example, in the example of FIG5 , the optical surface of the glass cover plate 1 is used to protect the optical waveguide unit array. The two optical waveguide unit arrays can be arranged between the two glass cover plates 1 by adhesive, and the extension directions of the optical waveguide units of the two optical waveguide unit arrays are arranged orthogonally, that is, the extension directions of the optical waveguide units are perpendicular to each other, so that the light beams converge at one point and ensure that the object-image plane is symmetrical relative to the equivalent refractive index optical lens 100, thereby realizing imaging of the optical lens 100. In addition, the use of two orthogonally arranged optical waveguide unit arrays improves the imaging resolution of the optical lens 100 and ensures the imaging quality of the optical lens 100.

[0077] As shown in Figures 5 and 6 , the two optical waveguide arrays can be a first optical waveguide array 21 and a second optical waveguide array 22. The first optical waveguide array 21 and the second optical waveguide array 22 are closely aligned and orthogonally arranged on the same plane. Preferably, the first optical waveguide array 21 and the second optical waveguide array 22 have the same thickness to facilitate design and production.

[0078] Each of the two glass cover plates 1 has two optical surfaces, and the glass cover plates 1 have a transmittance of 90%-100% for light with a wavelength between 390nm and 760nm. The glass cover plates 1 are used to protect the optical waveguide arrays and filter out excess light. It should be noted that if the tight orthogonal bonding of the first and second optical waveguide arrays 21, 22 provides sufficient strength, or if the installation environment has thickness restrictions, it is also possible to configure only one glass cover plate 1, or not configure a glass cover plate 1 at all.

[0079] As shown in FIG6 , the first optical waveguide array 21 and the second optical waveguide array 22 are composed of a plurality of reflective units 4 with rectangular cross-sections. The length of each reflective unit 4 is limited by the outer dimensions of the optical waveguide array and thus varies in length. The reflective units 4 in the first optical waveguide array 21 extend in the X direction, while the reflective units 4 in the second optical waveguide array 22 extend in the Y direction. The Z direction is the thickness direction of the optical waveguide array. The extension directions (optical waveguide array directions) of the reflective units 4 in the first optical waveguide array 21 and the second optical waveguide array 22 are perpendicular to each other. That is, when viewed from the Z direction (thickness direction), the first optical waveguide array 21 and the second optical waveguide array 22 are arranged orthogonally. This allows the two light beams in the orthogonal directions to converge at a point, and ensures that the object-image plane (the light source side and the imaging side) are symmetrical relative to the optical lens 100, resulting in an equivalent negative refraction phenomenon and achieving aerial imaging.

[0080] As shown in FIG7 , the first optical waveguide array 21 or the second optical waveguide array 22 is composed of a plurality of parallel reflective units 4 arranged at an angle of 45° relative to the user's viewing angle. Specifically, the first optical waveguide array 21 can be composed of reflective units 4 arranged side by side at a 45° angle to the lower left and having a rectangular cross-section, while the second optical waveguide array 22 can be composed of reflective units 4 arranged side by side at a 45° angle to the lower right and having a rectangular cross-section. The arrangement directions of the reflective units 4 in the two optical waveguide arrays can be interchanged. For example, the reflective units 4 in the first optical waveguide array 21 extend in the Y direction, while the reflective units 4 in the second optical waveguide array 22 extend in the X direction. The Z direction is the thickness direction of the optical waveguide array. When viewed from the Z direction (thickness direction), the first optical waveguide array 21 and the second optical waveguide array 22 are arranged orthogonally, so that the two light beams in the orthogonal directions converge at a point, and the object-image plane (the light source side and the imaging side) is ensured to be symmetrical relative to the optical lens 100, resulting in an equivalent negative refraction phenomenon and achieving aerial imaging. The optical waveguide material has an optical refractive index m1. In some embodiments, m1>1.4, for example, the value of m1 is 1.5, 1.8, 2.0, etc.

[0081] As shown in FIG8 , for the first optical waveguide array 21 and the second optical waveguide array 22, each reflective unit 4 has two intersecting surfaces with its adjacent reflective unit 4, and each intersecting surface is bonded by a highly light-transmitting adhesive 6. Preferably, the adhesive 6 can be a photosensitive adhesive or a thermosetting adhesive. The thickness of the adhesive 6 is T1, and satisfies T1>0.001mm, for example, T1=0.002mm, T1=0.003mm, or T1=0.0015mm. The specific thickness can be set according to specific needs. Adhesive 6 is provided between adjacent optical waveguide arrays in the optical lens 100, as well as between the optical waveguide array and the glass cover plate 1, to enhance firmness.

[0082] In some embodiments, the reflective unit 4 can have a rectangular cross-section, and a reflective film 5 can be provided on one or both sides of the reflective unit 4 along the arrangement direction. Specifically, in the arrangement direction of the optical waveguide array, each reflective unit 4 is coated with a reflective film 5 on both sides. The reflective film 5 can be made of a metal material such as aluminum, silver, or other non-metallic compound material that achieves total reflection. The function of the reflective film 5 is to prevent light from entering adjacent optical waveguide arrays due to lack of total reflection, thereby generating stray light that affects imaging. Alternatively, each reflective unit 4 can also have a dielectric film added to the reflective film 5 to increase light reflectivity.

[0083] The cross-sectional width d and cross-sectional length b of a single reflective unit 4 satisfy 0.1mm≤d≤5mm and 0.1mm≤b≤5mm. Furthermore, to obtain a better imaging effect, 0.1mm≤d≤2mm and 0.1mm≤b≤2mm are satisfied. For example, d=0.2mm, b=0.2mm; or, d=0.5mm, b=0.5mm. When displaying on a large screen, large-size requirements can be achieved by splicing multiple optical waveguide arrays. The overall shape of the optical waveguide array is set according to the needs of the application scenario. In this embodiment, the two groups of optical waveguide arrays are generally rectangular structures, the reflective units 4 at the two diagonals are triangular, and the reflective unit 4 in the middle is a trapezoidal structure. The lengths of the individual reflective units 4 are different. The reflective units 4 located at the diagonals of the rectangle are the longest, and the reflective units 4 at the two ends are the shortest. In addition, the optical lens 100 may also include an anti-reflection component and a viewing angle control component. The anti-reflection component can increase the overall transmittance of the optical lens 100 and improve the clarity and brightness of the floating real image. The viewing angle control component can be used to eliminate afterimages of floating real images, reduce the observer's sense of dizziness, and prevent the observer from peeking into the device from other angles, thereby improving the overall aesthetics of the device. The anti-reflection component and the viewing angle control component can be combined or independently positioned between the glass cover plate 1 and the waveguide array, between two layers of waveguide arrays, or on the outer layer of the glass cover plate 1.

[0084] Specifically, the aerial imaging principle of the floating real image disclosed in the present invention is as follows:

[0085] At the micrometer scale, a mutually orthogonal double-layer waveguide array structure is used to perform orthogonal decomposition of any optical signal. The original signal is projected onto the first optical waveguide array 21. A rectangular coordinate system is established with the original signal projection point as the origin and the x-axis perpendicular to the first optical waveguide array 21 as the axis. Within this rectangular coordinate system, the original signal is decomposed into two mutually orthogonal signals: signal X located on the x-axis and signal Y located on the y-axis. Signal X, upon passing through the first optical waveguide array 21, undergoes total reflection on the surface of the reflective film 5 at the same angle of incidence. Meanwhile, signal Y, remaining parallel to the first optical waveguide array 21, undergoes total reflection on the surface of the reflective film 5 at the same angle of incidence after passing through the first optical waveguide array 21. The resulting optical signal, composed of signal Y and signal X, is mirror-symmetrical with the original optical signal. Therefore, light from any direction passing through optical lens 100 achieves mirror symmetry. Divergent light from any light source converges symmetrically through optical lens 100 to form a floating real image. The imaging distance of the floating real image is the same as the distance from optical lens 100 to the image source, i.e., the display device, resulting in equidistant imaging. Furthermore, the floating real image is located in mid-air, requiring no specific carrier, but rather presenting a real image directly in the air. Therefore, the image in space perceived by the user is the image emitted by display light source 7 (as shown in FIG9 ).

[0086] In the embodiment of the present disclosure, the light emitted by the display light source 7 undergoes the above-described process on the optical lens 100 when passing through the optical lens 100. Specifically, as shown in FIG10 , the incident angles of the light on the first optical waveguide array 21 are α1, α2, and α3, respectively. The reflection angles of the light on the first optical waveguide array 21 are β1, β2, and β3, respectively, where α1 = β1, α2 = β2, and α3 = β3. After being reflected by the first optical waveguide array 21, the incident angles of the light on the second optical waveguide array 22 are γ1, γ2, and γ3, respectively. The reflection angles of the light on the second optical waveguide array 22 are δ1, δ2, and δ3, respectively, where γ1 = δ1, γ2 = δ2, and γ3 = δ3.

[0087] Furthermore, the incident angles after convergent imaging are α1, α2, α3...α n , the distance between the display light source 7 and the optical lens 100 is L, then the distance between the imaging position of the floating real image and the optical lens 100 is also L, and the viewing angle ε of the floating real image is 2 times max(α).

[0088] It is understandable that if the size of the optical waveguide array is small, the image can only be seen at a certain distance from the imaging side of the optical waveguide array; and if the size of the optical waveguide array is increased, a larger imaging distance can be achieved, thereby increasing the field of view.

[0089] Preferably, the angle between the optical lens 100 and the display light source 7 is set to be within the range of 45°±5°, thereby effectively utilizing the size of the optical lens 100, improving imaging quality and reducing the effects of residual images. Furthermore, if there are other requirements for the imaging position, other angles can be selected while sacrificing some imaging quality. Preferably, the size of the optical lens 100 is set to be able to display the entire floating real image presented by the display light source 7. However, if only a portion of the image of the display light source 7 is required during actual use, the size and position of the optical lens 100 can be freely adjusted according to the actual display image, without any restrictions.

[0090] In addition, the above mainly describes the imaging principle of the optical lens 100 using a double-layer optical waveguide array structure. In other embodiments, if the four sides are all provided with multiple cubic columnar reflective units 4 with reflective films 5, and the multiple cubic columnar reflective units 4 are arranged in an array along the X and Y directions in a single layer of the optical waveguide array structure, that is, the two layers of the optical waveguide array are merged into one layer, its imaging principle is the same as that of the double-layer optical waveguide array structure, and it can also be used as the structure of the optical lens 100.

[0091] In the embodiment, the first optical waveguide array 21 and the second optical waveguide array 22 have the same thickness, thereby simplifying the structural complexity of the first optical waveguide array 21 and the second optical waveguide array 22, reducing the difficulty of manufacturing the first optical waveguide array 21 and the second optical waveguide array 22, improving the production efficiency of the first optical waveguide array 21 and the second optical waveguide array 22, and reducing the production cost of the first optical waveguide array 21 and the second optical waveguide array 22. It should be noted that the thickness consistency here is a relative range, not an absolute consistency. That is, for the purpose of improving production efficiency, a certain thickness difference between the optical waveguide arrays can exist without affecting the quality of aerial imaging.

[0092] According to some embodiments of the present disclosure, the imaging mode of the display light source 7 may include RGB (red, green, blue) light emitting diodes (Light Emitting Diode, LED), LCD (Liquid Crystal Display), LCOS (Liquid Crystal on Silicon) devices, OLED (Organic Light-Emitting Diode, organic light-emitting diode) arrays, projection, laser, laser diode or any other suitable display or stereoscopic display, without limitation.

[0093] Other structures and operations of the electronic device according to the embodiment of the present disclosure are well known to those skilled in the art and will not be described in detail here.

[0094] In the description of the present disclosure, it should be understood that the terms "center", "thickness", "up", "down", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure 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 disclosure.

[0095] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0096] Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. An optical lens, characterized in that: include: Optical functional layer; a glass cover plate, the glass cover plate being provided at least on one side in a thickness direction of the optical functional layer; and An anti-reflection film layer is formed on a side of the glass cover plate away from the optical functional layer in the thickness direction, and the anti-reflection film layer includes a plurality of first anti-reflection film layers and a plurality of second anti-reflection film layers, and the plurality of first anti-reflection film layers and the plurality of second anti-reflection film layers are alternately stacked in a direction away from the optical functional layer.

2. The optical lens according to claim 1, wherein The bonding strength between the first anti-reflection film layer and the glass cover plate is greater than the bonding strength between the second anti-reflection film layer and the glass cover plate; and / or The refractive index of the first anti-reflection film layer is smaller than the refractive index of the second anti-reflection film layer.

3. The optical lens according to claim 1 or 2, characterized in that: The first anti-reflection film layer is a silicon dioxide film layer; and / or The second anti-reflection film layer is a titanium dioxide film layer.

4. The optical lens according to claim 3, wherein: The total number of layers of the plurality of first anti-reflection films and the plurality of second anti-reflection films is a, wherein a is an odd number; preferably, a satisfies: 5≤a≤11.

5. The optical lens according to claim 4, wherein: The plurality of first anti-reflection film layers include n first anti-reflection film layers, which are arranged in the order of the first first anti-reflection film layer, the second first anti-reflection film layer, the third first anti-reflection film layer, ... the n-1th first anti-reflection film layer and the nth first anti-reflection film layer in a direction away from the optical functional layer, wherein the thickness of the first first anti-reflection film layer is d1, the thickness of the second first anti-reflection film layer is d2, the thickness of the third first anti-reflection film layer is d3, the thickness of the n-1th first anti-reflection film layer is d n-1 The thickness of the nth anti-reflection film layer is d n , where d1, d2, d3, d n-1 and d n Satisfies: d1 ≥ d n ≥d2 / d3 / d n-1 .

6. The optical lens according to claim 5, wherein: When a=7, along the direction away from the optical functional layer, the first first anti-reflection film layer, the first second anti-reflection film layer, the second first anti-reflection film layer, the second second anti-reflection film layer, the third first anti-reflection film layer, the third second anti-reflection film layer, and the fourth first anti-reflection film layer are sequentially arranged, wherein: The thickness of the first anti-reflection film layer is d1, wherein d1 satisfies: 139nm≤d1≤149nm; and / or The thickness of the second first anti-reflection film layer is d2, wherein d2 satisfies: 31nm≤d2≤41nm; and / or The thickness of the third first anti-reflection film layer is d3, wherein d3 satisfies: 6nm≤d3≤16nm; and / or The thickness of the fourth first anti-reflection film layer is d4, wherein d4 satisfies: 81nm≤d4≤91nm; and / or The thickness of the first second anti-reflection film layer is d5, wherein d5 satisfies: 7nm≤d5≤17nm; and / or The thickness of the second anti-reflection film layer is d6, wherein d6 satisfies: 55nm≤d6≤65nm; and / or The thickness of the second anti-reflection film layer is d7, wherein d7 satisfies: 29nm≤d7≤39nm.

7. A method for preparing an optical lens, characterized in that: The following steps are involved: S1: pre-treating the glass cover; S2: The glass cover plate pretreated in S1 is subjected to an SI target, an intermediate frequency power supply, a power supply of 35.9 km / h to 36.1 kW, a single layer thickness of 67 nm to 77 nm, and an oxygen flow of 45 sccm to 55 sccm to form a first anti-reflection film layer, wherein the cumulative thickness of the first anti-reflection film layer is 139 nm to 149 nm; S3: Using a TIO target, an intermediate frequency power supply, a power supply of 3.9 km / h to 4.1 kW, a single layer thickness of 7 nm to 17 nm, and an oxygen flow of 15 sccm to 25 sccm to form a second anti-reflection film layer, the cumulative thickness of the second anti-reflection film layer being 7 nm to 17 nm; S4: Step S2 and step S3 are repeated alternately, and the power supply, power, and gas volume of step S2 are controlled to control the thickness of a single layer of the first anti-reflection film layer and the cumulative thickness of the first anti-reflection film layer. Controlling the power supply, power, and gas volume in step S3 to control the thickness of a single layer of the second anti-reflection film and the cumulative thickness of the second anti-reflection film; S5: After fine drawing and rough drawing, the glass cover is removed and the coating is completed.

8. The method for preparing an optical lens according to claim 7, wherein: The pretreatment includes rough extraction, fine extraction and ion cleaning.

9. The method for preparing an optical lens according to claim 8, wherein: When ion cleaning is used, a low-power mode is adopted, and the power is P, wherein P satisfies: P≤1kW.

10. An electronic device, characterized in that: include: monitor; and An optical lens, wherein the optical lens is an optical lens according to any one of claims 1 to 6 or an optical lens made according to the method for making an optical lens according to any one of claims 7 to 9, and the optical lens collects light emitted from the display to form a floating real image on a side of the optical lens away from the display.

Images