Optical element, imaging lens and electronic device

Abstract

An optical element includes a substrate and a low reflective layer. The low-reflection layer is arranged on the surface of the base material, and the low-reflection layer comprises a plurality of nano-particles. The nanoparticles are stacked with each other, and the number of the nanoparticles decreases progressively in the direction away from the substrate, so that the effective refractive index of the low-reflection layer decreases progressively in the direction away from the substrate, thereby avoiding total reflection of light on the interface, and further reducing the reflectivity. When specific conditions are met, the nanoparticles can be stacked to form a gradient refractive index film layer, and the low-reflection layer can provide better anti-reflection capability. The invention further discloses an imaging lens with the optical element and an electronic device with the imaging lens.

Description

Technical Field

[0001] The present disclosure relates to an optical element, an imaging lens and an electronic device, and in particular to an optical element and an imaging lens suitable for an electronic device. Background Art

[0002] As semiconductor process technology becomes more sophisticated, the performance of electronic photosensitive elements has been improved, and pixels can reach a smaller size. Therefore, optical lenses with high imaging quality have become an indispensable part. In addition, with the rapid development of technology, the application range of mobile devices equipped with optical lenses has become wider, and the requirements for optical lenses have also become more diverse.

[0003] In recent years, it has become increasingly popular to use micro-optical lenses in mobile devices to take photos. However, mobile devices are often used outdoors and are affected by strong sunlight, which causes the optical lenses to be affected by strong non-imaging stray light. In particular, non-imaging light is easily reflected in the optical lens, greatly reducing the image quality.

[0004] Conventional technology uses ink coating, sandblasting, and coating on the surface of opaque optical elements in optical lenses to reduce reflectivity and eliminate stray light. Although this can improve the quality of optical imaging, it is still not enough to eliminate high-intensity stray light. Furthermore, in the field of optical lenses for non-mobile devices, there are other technologies for reducing reflectivity. These technologies produce microstructures with multiple holes by manufacturing the surface of the film layer. However, their structural support is insufficient and the film layer is easily deformed by external forces, which greatly reduces the anti-reflection effect. Therefore, how to improve the structure of the internal parts of the optical lens to reduce the reflection intensity of non-imaging light to meet the current high-standard requirements for electronic devices has become an important issue in the relevant field. Summary of the invention

[0005] In view of the above-mentioned problems, the present disclosure discloses an optical element, an imaging lens and an electronic device, which help maintain a low reflectivity of the optical element surface, reduce the reflection of non-imaging light, and reduce the influence of stray light, so as to effectively improve the optical imaging quality of the imaging lens.

[0006] The present disclosure provides an optical element, which includes a substrate and a low-reflection layer. The low-reflection layer is disposed on a surface of the substrate, and the low-reflection layer includes a plurality of nanoparticles. The nanoparticles are stacked on each other, and the number of the nanoparticles decreases in a direction away from the substrate. The average particle size of the nanoparticles is It preferably meets the following conditions: The low reflection layer is photographed by a scanning electron microscope from a bird's-eye view to obtain an image, and the photographing area of ​​the low reflection layer by the scanning electron microscope is preferably 2 μm 2 Up to 200 μm 2The number of pixels with grayscale values ​​of 100 to 150 in the image is G1015, and the number of pixels with grayscale values ​​of 200 to 250 in the image is G2025, which preferably meets the following conditions: <G1015 / G2025<40。

[0007] The present disclosure further provides an optical element, which includes a substrate and a low-reflection layer. The low-reflection layer is disposed on a surface of the substrate, and the low-reflection layer includes a plurality of nanoparticles. The nanoparticles are stacked on each other, and the number of the nanoparticles decreases in a direction away from the substrate. A scanning electron microscope is used to photograph the low-reflection layer from a bird's-eye view to obtain an image, and the scanning electron microscope preferably photographs an area of ​​1 μm 2 Up to 2000μm 2 The number of pixels with grayscale values ​​of 100 to 150 in the image is G1015, and the number of pixels with grayscale values ​​of 200 to 250 in the image is G2025, which preferably meets the following conditions: <G1015 / G2025<40。

[0008] The present disclosure provides an imaging lens, which includes the aforementioned optical element, wherein the optical axis of the imaging lens passes through the optical element.

[0009] The present disclosure provides an electronic device, which includes the aforementioned imaging lens and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the imaging lens.

[0010] According to the optical element, imaging lens and electronic device disclosed in the present invention, by stacking nanoparticles so that the number of nanoparticles away from the substrate is smaller, the equivalent refractive index of the low-reflection layer can be reduced in the direction away from the substrate, thereby avoiding total reflection of light at the interface, thereby reducing the reflectivity.

[0011] when When the above conditions are met, it is more conducive to the stacking of nanoparticles to form a gradient refractive index film layer.

[0012] When G1015 / G2025 meets the above conditions, the low-reflection layer can provide better anti-reflection ability.

[0013] The above description of the contents of the present disclosure and the following description of the embodiments are used to demonstrate and explain the spirit and principle of the present disclosure, and to provide further explanation of the claims of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A three-dimensional schematic diagram of an imaging lens according to a first embodiment of the present disclosure is shown.

[0015] Figure 2 Draw Figure 1 Schematic diagram of the imaging lens.

[0016] Figure 3 Draw Figure 1 A three-dimensional schematic diagram of the imaging lens from another perspective and a partial enlarged schematic diagram thereof.

[0017] Figure 4 Draw Figure 1 A cross-sectional schematic diagram of an imaging lens and a partially enlarged schematic diagram thereof.

[0018] Figure 5 A three-dimensional schematic diagram of optical elements of an imaging lens according to another embodiment of the present disclosure is shown.

[0019] Figure 6 A three-dimensional schematic diagram of optical elements of an imaging lens according to another embodiment of the present disclosure is shown.

[0020] Figure 7 A three-dimensional schematic diagram of an imaging lens according to a second embodiment of the present disclosure is shown.

[0021] Figure 8 Draw Figure 7 Schematic diagram of the cross section of the imaging lens.

[0022] Fig. 9 A three-dimensional schematic diagram of an imaging lens according to a third embodiment of the present disclosure is shown.

[0023] Fig.10 Draw Fig. 9 Schematic diagram of the cross section of the imaging lens.

[0024] Fig.11 A three-dimensional schematic diagram of one side of an electronic device according to a fourth embodiment of the present disclosure is shown.

[0025] Fig.12 Draw Fig.11 A three-dimensional schematic diagram of the other side of the electronic device.

[0026] Fig.13 A schematic diagram illustrating the process of capturing an image using an ultra-wide-angle imaging lens.

[0027] Fig.14 A schematic diagram showing the process of capturing an image using a high-pixel imaging lens is shown.

[0028] Fig.15 A schematic diagram illustrating the process of capturing an image using a telephoto imaging lens is shown.

[0029] Fig.16 A schematic three-dimensional diagram of one side of an electronic device according to a fifth embodiment of the present disclosure is shown.

[0030] Fig.17 A three-dimensional schematic diagram of an electronic device according to a sixth embodiment of the present disclosure is shown.

[0031] Fig.18 Draw Fig.17 A schematic side view of an electronic device.

[0032] Fig.19 Draw Fig.17 A schematic top view of an electronic device.

[0033] Fig. 20 The low reflection layer of an embodiment of the present disclosure is photographed from a bird's-eye view using a scanning electron microscope to obtain a photographic area of ​​4.9 μm 2 images.

[0034] Fig.21 for Fig. 20 Grayscale distribution diagram that counts the number of pixels of each grayscale value in the image.

[0035] Fig. 22 The same as Fig. 20 The low reflection layer of the embodiment of the invention is photographed to obtain a photographing area of ​​19.76 μm 2 images.

[0036] Fig.23 for Fig. 22 Grayscale distribution diagram that counts the number of pixels of each grayscale value in the image.

[0037] Fig.24 The same as Fig. 20 The low reflection layer of the embodiment of the invention is photographed to obtain a photographing area of ​​123.62 μm 2 images.

[0038] Fig.25 for Fig.24 Grayscale distribution diagram that counts the number of pixels of each grayscale value in the image.

[0039] Fig.26 The same as Fig. 20 The low reflection layer of the embodiment of the invention is photographed to obtain a photographic area of ​​492.5 μm 2 images.

[0040] Fig. 27 for Fig.26 Grayscale distribution diagram that counts the number of pixels of each grayscale value in the image.

[0041] Fig.28 The same as Fig. 20 The low reflection layer of the embodiment of the invention is photographed to obtain a photographing area of ​​1961 μm 2 images.

[0042] Fig.29 for Fig.28 Grayscale distribution diagram that counts the number of pixels of each grayscale value in the image.

[0043] Fig.30 for Figure 1 A partial side view schematic diagram of an imaging lens having adhesive dropped on the lens barrel.

[0044] Fig.31 for Fig.30 A partial top view of the diagram.

[0045] Fig.32 It is a partial side view schematic diagram of a lens barrel without a hydrophobic layer with adhesive dropped on it.

[0046] Fig.33 for Fig.32 A partial top view of the diagram.

[0047]

Explanation of symbols

[0048] 1,2,3,40a,40b,40c,40d,50,50a,50b,50c,50d,50e,50f,50g,50h,60: Imaging lens 10,20,30: Lens barrel

[0049] 100,100b,100c,200,300,B1: Base material

[0050] 101,101b,101c,201,301: low reflection layer

[0051] 1010:Nano particles

[0052] 1012: Intermediary layer

[0053] 1014: Hydrophobic layer

[0054] 102,CL1: Adhesive

[0055] 11,21,31: Lens

[0056] 12,12b: Shading sheet

[0057] 13: Spacer ring

[0058] 14,14c,24,34: Fixed ring

[0059] IMG: Imaging surface

[0060] OL: Optical axis

[0061] S1,S2,SS:Surface

[0062] Average particle size

[0063] D: Height difference

[0064] T:Thickness

[0065] θ: Water contact angle

[0066] 4,5,6: Electronic devices

[0067] 41,51: Flash module

[0068] 42: Focus assist module

[0069] 43: Image Signal Processor

[0070] 44: Display module

[0071] P1: Optical Components DETAILED DESCRIPTION

[0072] The detailed features and advantages of the present disclosure are described in detail in the following embodiments, and the contents are sufficient to enable any person skilled in the art to understand the technical content of the present disclosure and implement it accordingly. According to the contents disclosed in this specification, the scope of the patent application and the drawings, any person skilled in the art can easily understand the relevant purposes and advantages of the present disclosure. The following examples further illustrate the concept of the present disclosure in detail, but do not limit the scope of the present disclosure in any way.

[0073] The present disclosure provides an optical element, which includes a substrate and a low-reflection layer. The low-reflection layer is disposed on a surface of the substrate, and the low-reflection layer includes a plurality of nanoparticles. These nanoparticles are stacked one on top of the other, and the number of nanoparticles decreases in the direction away from the substrate. Thus, by stacking the nanoparticles so that the number of nanoparticles away from the substrate is smaller, the equivalent refractive index of the low-reflection layer can be decreased in the direction away from the substrate, thereby avoiding total reflection of light at the interface, thereby reducing the reflectivity. Please refer to Figure 3 and Figure 4 ,in Figure 3 is a partially enlarged front view schematic diagram of the low reflection layer 101 according to the first embodiment of the present disclosure, and Figure 4 FIG. 1 is a schematic cross-sectional view showing a stacked structure of nanoparticles 1010 in a low-reflection layer 101 according to the first embodiment of the present disclosure. The number of the nanoparticles decreases in a direction away from the substrate, which may refer to the stacking of the nanoparticles into a multi-layer structure, wherein the number of particles in each layer decreases in a direction away from the substrate, so that the nanoparticles form a plurality of tip structures away from the substrate. Figure 3 The lighter areas in the enlarged view represent higher surface heights, while the darker areas represent lower surface heights. Figure 3 and Figure 4It is only used to illustrate the configuration, and the film thickness of the low reflection layer and the particle size and particle shape of the nanoparticles disclosed in the present invention are not drawn according to the actual scale.

[0074] The low-reflection layer is photographed from a bird's-eye view using a scanning electron microscope (SEM) to obtain an image. The photographed area of ​​the low-reflection layer by the SEM is 1 μm2. 2 ) to 2000μm 2 ; Thus, nanoparticles can be clearly identified. Among them, the scanning electron microscope can also take pictures of the low reflection layer in an area of ​​2μm 2 Up to 200 μm 2 Among them, the scanning electron microscope can also capture the low reflection layer in an area of ​​4μm 2 Up to 130μm 2 ; Thus, the preferred shooting area can more clearly identify the nanoparticles. Among them, the scanning electron microscope can use secondary electron (Secondary Electron) images, which can provide more detailed surface morphology information. Among them, the image brightness should be increased as much as possible during shooting so that the nanoparticles can be clearly identified, but at the same time, the brightness of the nanoparticles should be avoided from being oversaturated. Specifically, the grayscale value of the brightest nanoparticle in the image is about 250.

[0075] Please refer to Fig. 20 and Fig.21 ,in Fig. 20 The low reflection layer of an embodiment of the present disclosure is photographed from a bird's-eye view using a scanning electron microscope to obtain a photographic area of ​​4.9 μm 2 images, and Fig.21 for Fig. 20 Grayscale distribution diagram of the number of pixels at each grayscale value in the image. Fig. 20It can be seen that the granular nanoparticles are stacked on top of each other, causing the low-reflection layer to form undulations. Among them, some of the larger-sized particles may be hollow, while some adjacent nanoparticles can fuse together, which helps to stack the nanoparticles more firmly. The bit depth of the image captured by the scanning electron microscope is 8 bits, and its grayscale value ranges from 0 (black) to 255 (white). The closer the nanoparticles are to the top, the higher their brightness, and thus the higher their grayscale value. In this way, it can be confirmed by image analysis that the number of nanoparticles in the low-reflection layer decreases in the direction away from the substrate. Among them, if the original image is of other bit depths such as 10 bits or 16 bits, the bit depth of the image needs to be converted to 8 bits before analysis. Among them, the image analysis uses the original image captured by the scanning electron microscope, and the image is not subjected to post-processing, such as post-processing that changes image information such as adjusting brightness or contrast.

[0076] The number of pixel points with grayscale values from 100 to 150 in the image is G1015, and the number of pixel points with grayscale values from 200 to 250 in the image is G2025, which satisfy the following condition: 3 < G1015 / G2025 < 40; thereby, the low-reflection layer can provide better antireflection ability. Among them, the following condition can also be satisfied: 9 < G1015 / G2025 < 27; thereby, it helps to adjust the gradient degree of the equivalent refractive index of the low-reflection layer. Please refer to Figures 20 to 29 , wherein Fig. 20 、 Fig. 22 、 Fig.24 、 Fig.26 and Fig.28 are respectively five images numbered 1 to 5 with a shooting area of 4.9μm 2 , 19.76μm 2 , 123.62μm 2 , 492.5μm 2 and 1961μm 2 obtained by shooting the low-reflection layer of an embodiment of the present disclosure from an aerial view with a scanning electron microscope, and Fig.21 、 Fig.23 、 Fig.25 、 Fig. 27 and Fig.29 are respectively the grayscale distribution diagrams of the number of pixel points with each grayscale value statistically analyzed in the images numbered 1 to 5. Among them, the images numbered 1 to 5 are of the same sample, with the magnification decreasing from large to small and the shooting area increasing from small to large. After shooting with a scanning electron microscope, image analysis software is used to analyze the grayscale values of all pixel points in the images numbered 1 to 5, and the pixel points with grayscale values from 100 to 250 are statistically analyzed as Fig.21 、 Fig.23 、 Fig.25 、 Fig. 27 and Fig.29As shown below. Table 1 below shows the number of pixel points G1015 with gray-scale values from 100 to 150, the number of pixel points G2025 with gray-scale values from 200 to 250, and their ratio G1015 / G2025 in the images of integration numbers 1 to 5 respectively. Additionally, it should be noted that since the gray-scale values from 0 to 100 are background noise and particles with insufficient brightness, and the gray-scale values from 250 to 255 are particles with excessive brightness, which are likely to affect the statistical values, thus in this disclosure, pixel points with gray-scale values from 100 to 250 are selected for statistics.

[0077]

[0078]

[0079] The average particle size of the nanoparticles is It can satisfy the following conditions: Thereby, it is more conducive to the stacking of nanoparticles to form a graded refractive index film layer. Among them, it can also satisfy the following conditions: Please refer to Fig. 20 , which is an image of the nanoparticles in the low-reflection layer taken by a scanning electron microscope, and the morphology and size of the nanoparticles can be observed. Then, the particles can be image-processed and analyzed, for example, by methods such as image analysis software, to calculate the average particle size. Among them, when calculating the average particle size of the nanoparticles, nanoparticles closer to the top of the low-reflection layer can be selected, and nanoparticles with a complete particle contour that can be observed are counted. Among them, at least five nanoparticles are required to calculate the average particle size. And when the nanoparticles are not circular, the longest connection line passing through the nanoparticles is taken as the particle size. For example, Table 2 below lists Fig. 20 the numbers in to of the particle sizes and their average values of seven representative nanoparticles

[0080]

[0081] The thickness of the low-reflection layer can have undulations, and the height difference of the thickness of the low-reflection layer is D, which can satisfy the following conditions: 120nm < D < 650nm. Thereby, it helps to form a graded refractive index and thus reduce the reflectivity. Among them, it can also satisfy the following conditions: 200nm < D < 450nm. Please refer to Figure 4, which is a schematic diagram showing the parameter D in accordance with the first embodiment of the present disclosure. Among them, the low-reflection layer is sectioned, and in the microscope field of view, the height difference between the highest point and the lowest point on the outer surface of the low-reflection layer can be regarded as the height difference D of the thickness of the low-reflection layer. Among them, a transmission electron microscope (TEM) or a scanning electron microscope can be used to photograph the cross-section of the low-reflection layer, and the height difference D of the thickness of the low-reflection layer can be determined through the photographed image, but the present disclosure is not limited thereto.

[0082] The low-reflection layer may further include an intermediate layer disposed between the substrate and the nanoparticles, and the thickness of the intermediate layer may have undulations. Thereby, it helps the nanoparticles to form a gradient refractive index. Among them, the intermediate layer can be a black coating, and after being coated on the surface of the substrate, a dry etching process (such as bombarding the intermediate layer with plasma) is used on the intermediate layer to make its thickness have undulations. For example, the intermediate layer can be a black ink spraying layer formed by a quick-drying ink based on epoxy resin, a blackening coating layer deposited by chemical vapor deposition, or a photoresistive coating layer, etc., which are dark coatings with light absorption effects, but the present disclosure is not limited thereto. Among them, a material with a higher hardness can be selected for the intermediate layer, which helps to form a surface profile with undulations.

[0083] The water contact angle of the surface of the substrate is θ, which can satisfy the following conditions: 90 degrees < θ < 130 degrees. Thereby, the surface of the substrate has a hydrophobic property, which can prevent pollutants from staying on the surface, thus helping to improve the anti-pollution ability. Please refer to Fig.30 , which is a schematic diagram showing the water contact angle θ in accordance with the first embodiment of the present disclosure.

[0084] The low-reflection layer may further include a hydrophobic layer, and the hydrophobic layer is farther from the substrate than the nanoparticles. Among them, the thickness of the hydrophobic layer is T, which can satisfy the following conditions: 10 nm < T < 50 nm. Thereby, it can provide better hydrophobic properties and can protect the nanoparticles. Please refer to Figure 4 , which is a schematic diagram showing the parameter T in accordance with the first embodiment of the present disclosure.

[0085] The optical element may further include an adhesive to enable the optical element to be interconnected with adjacent elements. Among them, the adhesive is disposed on the surface of the substrate, and the adhesive is farther from the substrate than the hydrophobic layer. Thereby, the hydrophobic layer helps to control the flow of the adhesive, which can prevent the adhesive from spreading to the surrounding area, thus avoiding affecting the appearance of the optical element and the connection stability. Please refer to Figure 30 to Figure 33 , where Fig.30FIG. 1 is a partial side view of an imaging lens 1 according to the first embodiment of the present disclosure, in which an adhesive 102 is dripped onto the lens barrel 10 . Fig.31 for Fig.30 A partial top view of Fig.32 is a partial side view schematic diagram of an optical element P1 (eg, a lens barrel) without a hydrophobic layer with adhesive CL1 dropped thereon, and Fig.33 for Fig.32 A partial top view of the diagram. Fig.30 and Fig.31 It can be seen that the optical element (such as the lens barrel 10) provided with the hydrophobic layer 1014 has better control over the diffusion of the liquid such as the adhesive (such as glue) 102. Fig.32 and Fig.33 It can be seen that for an optical element P1 without a hydrophobic layer, the adhesive CL1 thereon will diffuse to the surrounding area, thus affecting the function of the adhesive CL1 and the appearance of the optical element P1. Fig.30 The surface S1 of the middle substrate 100 is provided with a hydrophobic layer 1014 , and the water contact angle θ between the hydrophobic layer 1014 and the adhesive 102 is 117.1 degrees on the left side of the figure, and 117.1 degrees on the right side of the figure, and the average is 117.1 degrees. Fig.32 The surface SS of the middle substrate B1 has no hydrophobic layer, and the water contact angle θ between the surface SS and the adhesive CL1 is 67.2 degrees on the left side of the figure and 67.2 degrees on the right side of the figure, and the average is 67.2 degrees.

[0086] The main component of the nanoparticles may be one of SiO2, TiO2 and Al2O3, wherein the main component represents a weight percentage greater than 50%.

[0087] The present disclosure provides an imaging lens, which includes the aforementioned optical element, wherein the optical axis of the imaging lens passes through the optical element. The optical element has an optical purpose, and the optical element may be, for example, a lens barrel, a light shielding plate, a spacer ring or a fixing ring, etc. The mechanical purpose of these optical elements helps the imaging lens to gather light, but the optical purpose of the optical element is not limited to this. Among them, the optical element may be an opaque material and has a light shielding purpose. Among them, the optical purpose of the optical element may be a purpose related to optical phenomena such as turning, converging, diverging, shielding, and reducing reflection, but the present disclosure is not limited to the literal description of the above-mentioned purpose.

[0088] The surface of the substrate may be located at the object side of the optical element. The object side of the optical element is easier to observe from the outside of the imaging lens, so a lower surface reflectivity and better anti-fouling ability are required. The low reflectivity referred to herein may refer to an average reflectivity of less than 0.2% in the visible light band.

[0089] The present disclosure provides an electronic device, which includes the aforementioned imaging lens and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the imaging lens.

[0090] The various technical features of the optical elements disclosed in the present disclosure can be configured in combination to achieve corresponding effects.

[0091] According to the above implementation modes, specific embodiments are proposed below and described in detail with reference to the accompanying drawings.

[0092] <First Embodiment>

[0093] Please refer to Figures 1 to 4 , Fig.30 and Fig.31 ,in Figure 1 A three-dimensional schematic diagram of an imaging lens according to a first embodiment of the present disclosure is shown. Figure 2 Draw Figure 1 Schematic diagram of the imaging lens. Figure 3 Draw Figure 1 Another perspective stereoscopic diagram of the imaging lens and its partial enlarged diagram, Figure 4 Draw Figure 1 A cross-sectional schematic diagram of the imaging lens and a partial enlarged schematic diagram thereof, Fig.30 for Figure 1 A partial side view schematic diagram of an imaging lens having adhesive dropped on the lens barrel of the imaging lens, and Fig.31 for Fig.30 A partial top view of the diagram.

[0094] The imaging lens 1 of the present embodiment is an ultra-wide-angle imaging lens, and its lens viewing angle is 120 degrees. The imaging lens 1 includes a plurality of optical elements and an imaging surface IMG, and these optical elements include a lens barrel 10, a plurality of lenses 11, a plurality of light shielding sheets 12, a spacer ring 13 and a fixing ring 14. Among them, the lenses 11, the light shielding sheets 12, the spacer ring 13 and the fixing ring 14 are all accommodated in the lens barrel 10, and the optical axis OL of the imaging lens 1 passes through these optical elements. After entering the lens barrel 10, the light passes through the lens 11 and the light shielding sheet 12 to become imaging light and is imaged on the imaging surface IMG. It is worth noting that the components in the lens barrel 10 are not limited to the outlines in the accompanying drawings.

[0095] The lens barrel 10 includes a substrate 100, a low-reflection layer 101, and an adhesive 102. The substrate 100 has a surface S1 facing the object side, and the surface S1 is located at the object side end of the lens barrel 10. The low-reflection layer 101 is disposed on the surface S1 of the substrate 100, and the low-reflection layer 101 includes a plurality of nanoparticles 1010, an intermediate layer 1012, and a hydrophobic layer 1014. The adhesive 102 is disposed on the surface S1 of the substrate 100, and the adhesive 102 is farther from the substrate 100 than the low-reflection layer 101.

[0096] The nanoparticles 1010 of the low-reflection layer 101 are stacked and arranged one on top of the other, and the number of the nanoparticles 1010 decreases in a direction away from the substrate 100. In this embodiment, the main component of the nanoparticles 1010 is SiO2.

[0097] The intermediate layer 1012 of the low reflection layer 101 is disposed between the substrate 100 and the nanoparticles 1010 , and the thickness of the intermediate layer 1012 has ups and downs. The hydrophobic layer 1014 of the low reflection layer 101 is farther away from the substrate 100 than the nanoparticles 1010 .

[0098] like Fig. 20 As shown, the average particle size of the nanoparticles 1010 is It meets the following conditions:

[0099] like Figure 4 As shown, the height difference of the thickness of the low reflection layer 101 is D, which satisfies the following condition: D=372nm.

[0100] The thickness of the hydrophobic layer 1014 is T, which satisfies the following condition: T=35 nm.

[0101] like Fig.30 As shown, the water contact angle of the surface S1 of the substrate 100 is θ, which satisfies the following condition: θ=117.1 degrees.

[0102] The low reflection layer 101 is photographed from a bird's-eye view using a scanning electron microscope to obtain an image, and the photographing area of ​​the low reflection layer 101 using the scanning electron microscope is 1 μm 2 Up to 2000μm 2 The number of pixels with grayscale values ​​between 100 and 150 in the image is G1015, and the number of pixels with grayscale values ​​between 200 and 250 in the image is G2025, which meets the following conditions: 3 <G1015 / G2025<40。

[0103] In the optical element of the imaging lens 1 of the present embodiment, the lens barrel 10 is provided with a low-reflection layer 101, but the present disclosure is not limited thereto. In the optical element of the imaging lens of other embodiments, for example, a light shielding sheet, a spacer ring, or a fixing ring may be provided with a low-reflection layer. In addition, in some embodiments, the imaging lens may also have multiple optical elements all provided with a low-reflection layer.

[0104] For example, see Figure 5 , is a three-dimensional schematic diagram illustrating an optical element of an imaging lens according to another embodiment of the present disclosure. The imaging lens of this embodiment is different from the aforementioned Figure 1The imaging lens 1 is similar to the imaging lens 1, and the same reference numerals are used to represent the same components. The functions and effects of each component are the same as those described above and will not be repeated here.

[0105] In the optical element of the imaging lens of the present embodiment, the shading film 12b includes a substrate 100b and a low-reflection layer 101b. The substrate 100b has a surface S1 facing the object side, and the surface S1 is located at the object side end of the shading film 12b. The low-reflection layer 101b is disposed on the surface S1 of the substrate 100b. The nanoparticles of the low-reflection layer 101b are stacked on each other, and the number of nanoparticles decreases in the direction away from the substrate 100b. An image is obtained by photographing the low-reflection layer 101b of the shading film 12b from a bird's-eye view using a scanning electron microscope, and the photographing area of ​​the low-reflection layer 101b using the scanning electron microscope is 1 μm 2 Up to 2000μm 2 The number of pixels with grayscale values ​​between 100 and 150 in the image is G1015, and the number of pixels with grayscale values ​​between 200 and 250 in the image is G2025, which meets the following conditions: 3 <G1015 / G2025<40。

[0106] For another example, please refer to Figure 6 , is a three-dimensional schematic diagram illustrating an optical element of an imaging lens according to another embodiment of the present disclosure. The imaging lens of this embodiment is different from the aforementioned Figure 1 The imaging lens 1 is similar to the imaging lens 1, and the same reference numerals are used to represent the same components. The functions and effects of each component are the same as those described above and will not be repeated here.

[0107] In the optical element of the imaging lens of the present embodiment, the fixing ring 14c includes a substrate 100c, a low-reflection layer 101c and an adhesive. The substrate 100c has a surface S2 facing the image side, and the surface S2 is located at the image side end of the fixing ring 14c. The low-reflection layer 101c is arranged on the surface S2 of the substrate 100c. The adhesive is arranged on the surface S2 of the substrate 100c, and the adhesive is away from the substrate 100c compared with the low-reflection layer 101c. Among them, the nanoparticles of the low-reflection layer 101c are stacked on each other, and the number of nanoparticles decreases in the direction away from the substrate 100c. The low-reflection layer 101c contacts the adhesive so that the fixing ring 14c can be connected to the lens barrel, thereby fixing the lens. In addition, the hydrophobic property of the hydrophobic layer of the low-reflection layer 101c can prevent the adhesive from affecting the reflectivity of the low-reflection layer 101c, thereby reducing the generation of stray light. The low reflection layer 101c of the fixing ring 14c is photographed by a scanning electron microscope from a bird's-eye view to obtain an image, and the photographing area of ​​the low reflection layer 101c by the scanning electron microscope is 1 μm 2 Up to 2000μm 2The number of pixels with grayscale values ​​between 100 and 150 in the image is G1015, and the number of pixels with grayscale values ​​between 200 and 250 in the image is G2025, which meets the following conditions: 3 <G1015 / G2025<40。

[0108] <Second Embodiment>

[0109] Please refer to Figure 7 and Figure 8 ,in Figure 7 A perspective schematic diagram of an imaging lens according to a second embodiment of the present disclosure is shown, and Figure 8 Draw Figure 7 The imaging lens 2 of this embodiment is similar to the imaging lens 1 of the first embodiment, and the same reference numerals are used to represent the same elements. The functions and effects of each element are the same as those described above, and will not be described in detail here.

[0110] The imaging lens 2 of this embodiment is a telephoto imaging lens, and its lens viewing angle is 36 degrees. The imaging lens 2 includes a plurality of optical elements and an imaging surface IMG, and these optical elements include a lens barrel 20, a plurality of lenses 21 and a fixing ring 24. Among them, the lenses 21 and the fixing ring 24 are both accommodated in the lens barrel 20, and the optical axis OL of the imaging lens 2 passes through these optical elements. After entering the lens barrel 20, the light passes through the lens 21 and becomes an imaging light and is imaged on the imaging surface IMG. It is worth noting that the components in the lens barrel 20 are not limited to the outlines in the accompanying drawings.

[0111] The lens barrel 20 includes a substrate 200 and a low reflection layer 201. The substrate 200 has a surface S1 facing the object side, and the surface S1 is located at the object side end of the lens barrel 20. The low reflection layer 201 is disposed on the surface S1 of the substrate 200, and the low reflection layer 201 includes a plurality of nanoparticles.

[0112] The nanoparticles of the low reflection layer 201 are stacked and arranged, and the number of the nanoparticles decreases in a direction away from the substrate 200. In this embodiment, the main component of the nanoparticles is one of SiO2, TiO2 and Al2O3.

[0113] The average particle size of the nanoparticles is It meets the following conditions:

[0114] The height difference of the low reflection layer 201 is D, which satisfies the following conditions: 120nm <D<650nm。

[0115] The low reflection layer 201 is photographed from a bird's-eye view using a scanning electron microscope to obtain an image, and the photographing area of ​​the low reflection layer 201 using the scanning electron microscope is 1 μm 2 Up to 2000μm2 The number of pixels with grayscale values ​​between 100 and 150 in the image is G1015, and the number of pixels with grayscale values ​​between 200 and 250 in the image is G2025, which meets the following conditions: 3 <G1015 / G2025<40。

[0116] In the optical element of the imaging lens 2 of the present embodiment, the low-reflection layer 201 is configured for the lens barrel 20, but the present disclosure is not limited thereto. In the optical element of the imaging lens of other embodiments, for example, the fixing ring may be configured with a low-reflection layer. In addition, in some embodiments, the imaging lens may also have multiple optical elements all configured with a low-reflection layer.

[0117] <Third Embodiment>

[0118] Please refer to Fig. 9 and Fig.10 ,in Fig. 9 A three-dimensional schematic diagram of an imaging lens according to a third embodiment of the present disclosure is shown, and Fig.10 Draw Fig. 9 The imaging lens 3 of this embodiment is similar to the imaging lens 1 of the first embodiment, and the same reference numerals are used to represent the same elements. The functions and effects of each element are the same as those described above, and will not be described in detail here.

[0119] The imaging lens 3 of the present embodiment is a wide-angle imaging lens, and its lens viewing angle is 79 degrees. The imaging lens 3 includes a plurality of optical elements and an imaging surface IMG, and these optical elements include a lens barrel 30, a plurality of lenses 31 and a fixing ring 34. Among them, the lenses 31 and the fixing ring 34 are both accommodated in the lens barrel 30, and the optical axis OL of the imaging lens 3 passes through these optical elements. After the light enters the lens barrel 30, it passes through the lens 31 and becomes an imaging light and is imaged on the imaging surface IMG. It is worth noting that the components in the lens barrel 30 are not limited to the outlines in the accompanying drawings.

[0120] The lens barrel 30 includes a substrate 300 and a low reflection layer 301. The substrate 300 has a surface S1 facing the object side, and the surface S1 is located at the object side end of the lens barrel 30. The low reflection layer 301 is disposed on the surface S1 of the substrate 300, and the low reflection layer 301 includes a plurality of nanoparticles.

[0121] The nanoparticles of the low reflection layer 301 are stacked and arranged, and the number of the nanoparticles decreases in a direction away from the substrate 300. In this embodiment, the main component of the nanoparticles is one of SiO2, TiO2 and Al2O3.

[0122] The average particle size of the nanoparticles is It meets the following conditions:

[0123] The height difference of the low reflection layer 301 is D, which satisfies the following conditions: 120nm <D<650nm。

[0124] The low reflection layer 301 is photographed from a bird's-eye view using a scanning electron microscope to obtain an image, and the photographing area of ​​the low reflection layer 301 using the scanning electron microscope is 1 μm 2 Up to 2000μm 2 The number of pixels with grayscale values ​​between 100 and 150 in the image is G1015, and the number of pixels with grayscale values ​​between 200 and 250 in the image is G2025, which meets the following conditions: 3 <G1015 / G2025<40。

[0125] In the optical element of the imaging lens 3 of the present embodiment, the low-reflection layer 301 is configured for the lens barrel 30, but the present disclosure is not limited thereto. In the optical element of the imaging lens of other embodiments, for example, the fixing ring may be configured with a low-reflection layer. In addition, in some embodiments, the imaging lens may also have multiple optical elements all configured with a low-reflection layer.

[0126] <Fourth Embodiment>

[0127] Please refer to Fig.11 and Fig.12 ,in Fig.11 A three-dimensional schematic diagram of one side of an electronic device according to a fourth embodiment of the present disclosure is shown, and Fig.12 Draw Fig.11 A three-dimensional schematic diagram of the other side of the electronic device.

[0128] In this embodiment, the electronic device 4 is a smart phone and includes a plurality of imaging lenses, a flash module 41, a focus auxiliary module 42, an image signal processor 43, a display module (user interface) 44, an image software processor (not shown), and an electronic photosensitive element (not shown).

[0129] These imaging lenses include an ultra-wide-angle imaging lens 40a, a high-pixel imaging lens 40b, a telephoto imaging lens 40c, and a telephoto imaging lens 40d. The imaging lens 40a, for example, includes the imaging lens 1 of the first embodiment, and the imaging lens 40c, for example, includes the imaging lens 2 of the second embodiment. Electronic photosensitive elements are disposed on the imaging surfaces of the imaging lenses 40a, 40b, 40c, and 40d.

[0130] The ultra-wide-angle imaging lens 40a has the function of accommodating multiple views. Fig.13 FIG. 4 is a schematic diagram showing an image captured by an ultra-wide-angle imaging lens 40 a.

[0131] The high-pixel imaging lens 40b has the functions of high resolution and low distortion. The high-pixel imaging lens 40b can further capture Fig.13 part of the image. Fig.14 FIG. 4 is a schematic diagram showing the process of capturing an image using a high-pixel imaging lens 40 b.

[0132] The telephoto imaging lenses 40c and 40d have a high magnification function. The telephoto imaging lenses 40c and 40d can further capture Fig.14 part of the image. Fig.15 A schematic diagram of capturing an image with telephoto imaging lenses 40c and 40d is shown. The maximum field of view (FOV) of the imaging lens corresponds to Fig.15 perspective.

[0133] When the user shoots the subject, the electronic device 4 uses the ultra-wide-angle imaging lens 40a, the high-pixel imaging lens 40b, the telephoto imaging lens 40c or the telephoto imaging lens 40d to focus and capture the image, activates the flash module 41 for fill light, and uses the object distance information of the subject provided by the focus auxiliary module 42 for rapid focusing, and the image signal processor 43 performs image optimization processing to further improve the image quality produced by the imaging lens, while providing a zoom function. The focus auxiliary module 42 can use an infrared or laser focus auxiliary system to achieve rapid focusing. The display module 44 can use a touch screen with a touch function, and can manually adjust the shooting angle, thereby switching different imaging lenses, and cooperating with the diverse functions of the image software processor to perform image shooting and image processing (or a physical shooting button can be used for shooting). The image processed by the image software processor can be displayed on the display module 44.

[0134] <Fifth Embodiment>

[0135] Please refer to Fig.16 , is a three-dimensional schematic diagram illustrating one side of an electronic device according to a fifth embodiment of the present disclosure.

[0136] In this embodiment, the electronic device 5 is a smart phone. The electronic device 5 includes an imaging lens 50, an imaging lens 50a, an imaging lens 50b, an imaging lens 50c, an imaging lens 50d, an imaging lens 50e, an imaging lens 50f, an imaging lens 50g, an imaging lens 50h, a flash module 51, an image signal processor, a display device, an image software processor (not shown), and an electronic photosensitive element (not shown). The imaging lens 50, the imaging lens 50a, the imaging lens 50b, the imaging lens 50c, the imaging lens 50d, the imaging lens 50e, the imaging lens 50f, the imaging lens 50g, and the imaging lens 50h are all arranged on the same side of the electronic device 5, and the display device is arranged on the other side of the electronic device 5. Among them, the imaging lens 50, for example, includes the imaging lens 1 of the first embodiment, the imaging lens 50d, for example, includes the imaging lens 2 of the second embodiment, and the imaging lens 50e, for example, includes the imaging lens 3 of the third embodiment. The electronic photosensitive element is disposed on the imaging surface of the imaging lenses 50, 50a, 50b, 50c, 50d, 50e, 50f, 50g, and 50h.

[0137] The imaging lens 50 is an ultra-wide-angle imaging lens, the imaging lens 50a is a telephoto imaging lens, the imaging lens 50b is a telephoto imaging lens, the imaging lens 50c is a telephoto imaging lens, the imaging lens 50d is a telephoto imaging lens, the imaging lens 50e is a wide-angle imaging lens, the imaging lens 50f is a wide-angle imaging lens, the imaging lens 50g is an ultra-wide-angle imaging lens, and the imaging lens 50h is a Time of Flight (ToF) imaging lens. The imaging lens 50, the imaging lens 50a, the imaging lens 50b, the imaging lens 50c, the imaging lens 50d, the imaging lens 50e, the imaging lens 50f and the imaging lens 50g of this embodiment have different viewing angles, so that the electronic device 5 can provide different magnifications to achieve an optical zoom shooting effect. In addition, the imaging lens 50a and the imaging lens 50b are telephoto imaging lenses with a light deflection element configuration. In addition, the imaging lens 50h can obtain depth information of the image. The electronic device 5 includes a plurality of imaging lenses 50, 50a, 50b, 50c, 50d, 50e, 50f, 50g, 50h as an example, but the number and configuration of the imaging lenses are not intended to limit the present disclosure. When the user takes a photo of a subject, the electronic device 5 uses the imaging lens 50, the imaging lens 50a, the imaging lens 50b, the imaging lens 50c, the imaging lens 50d, the imaging lens 50e, the imaging lens 50f, the imaging lens 50g or the imaging lens 50h to focus light and take an image, activates the flash module 51 for fill light, and performs subsequent processing in a manner similar to the aforementioned embodiment, which will not be described in detail herein.

[0138] <Sixth Embodiment>

[0139] Please refer to Figures 17 to 19 ,in Fig.17 FIG. 1 is a three-dimensional schematic diagram of an electronic device according to a sixth embodiment of the present disclosure. Fig.18 Draw Fig.17 A schematic side view of an electronic device, and Fig.19 Draw Fig.17 A schematic top view of an electronic device.

[0140] In this embodiment, the electronic device 6 is a car and includes a plurality of vehicle imaging lenses 60, and these imaging lenses 60 include the imaging lenses disclosed herein, which can be applied to a panoramic driving assistance system, a driving recorder, and a reverse imaging device, for example.

[0141] like Fig.17 As shown, the imaging lens 60 can be set around the car body, for example, to capture images around the car, which helps to identify the road conditions outside the car, thereby realizing the automatic assisted driving function. In addition, the images can be combined into a panoramic picture through the image software processor to provide the driver with images of the blind spots, so that the driver can control the situation around the car body, which is convenient for driving and parking.

[0142] like Fig.18 As shown, the imaging lens 60 may be disposed, for example, below the left and right rearview mirrors, respectively, wherein the viewing angle of the imaging lens 60 may be 40 degrees to 90 degrees, for capturing image information within the left and right lanes.

[0143] like Fig.19 As shown, the imaging lens 60 can also be arranged, for example, below the left and right rearview mirrors and inside the front and rear windshields, thereby helping the driver to obtain external space information outside the cockpit, providing more viewing angles to reduce blind spots and improve driving safety.

[0144] The optical elements and imaging lenses disclosed herein are not limited to applications in smart phones, panoramic driving assistance systems, driving recorders, and reversing imaging devices. Optical elements and imaging lenses can be applied to a variety of mobile focus systems as required, and have the characteristics of excellent aberration correction and good imaging quality. For example, optical elements and imaging lenses can be widely used in electronic devices such as three-dimensional (3D) image capture, digital cameras, mobile devices, tablet computers, smart TVs, network monitoring equipment, multi-lens devices, identification systems, somatosensory game consoles, and wearable devices. The aforementioned electronic devices are only exemplary examples of the actual application of the present disclosure, and do not limit the scope of application of the optical elements and imaging lenses disclosed herein.

[0145] Although the present disclosure is disclosed in the above embodiments, these embodiments are not intended to limit the present disclosure. Any changes and modifications made without departing from the spirit and scope of the present disclosure are within the scope of patent protection of the present disclosure. Please refer to the attached claims for the scope of protection defined by the present disclosure.

Claims

1. An optical element, characterized in that: Include: a substrate; and A low reflection layer is disposed on a surface of the substrate, and the low reflection layer comprises: A plurality of nanoparticles, wherein the nanoparticles are stacked one on another, and the number of the nanoparticles decreases in a direction away from the substrate; The average particle size of the nanoparticles is It meets the following conditions: The low-reflection layer is photographed by a scanning electron microscope from a bird's-eye view to obtain an image. The scanning electron microscope photographs an area of ​​2 μm 2 Up to 200 μm 2 , the number of pixels with grayscale values ​​of 100 to 150 in the image is G1015, and the number of pixels with grayscale values ​​of 200 to 250 in the image is G2025, which meets the following conditions: 3 <G1015 / G2025<40。 2. The optical element according to claim 1, characterized in that The scanning electron microscope photographs the low reflection layer in an area of ​​4 μm 2 Up to 130μm 2 .

3. The optical element according to claim 2, characterized in that The number of pixels with grayscale values ​​of 100 to 150 in the image is G1015, and the number of pixels with grayscale values ​​of 200 to 250 in the image is G2025, which meets the following conditions: 9 <G1015 / G2025<27。 4. The optical element according to claim 1, characterized in that The average particle size of the nanoparticles is It meets the following conditions:

5. The optical element according to claim 1, characterized in that The thickness of the low-reflection layer has ups and downs, and the height difference of the thickness of the low-reflection layer is D, which satisfies the following conditions: 120nm <D<650nm。 6. The optical element according to claim 5, characterized in that The height difference of the thickness of the low-reflection layer is D, which satisfies the following conditions: 200nm <D<450nm。 7. The optical element according to claim 5, characterized in that The low reflection layer further includes an intermediate layer, which is arranged between the substrate and the nanoparticles, and the thickness of the intermediate layer has high and low fluctuations.

8. The optical element according to claim 1, characterized in that The water contact angle of the surface of the substrate is θ, which satisfies the following conditions: 90 degrees <θ < 130 degrees.

9. The optical element according to claim 8, characterized in that The low-reflection layer further comprises a hydrophobic layer, the hydrophobic layer is farther away from the substrate than the nanoparticles, the thickness of the hydrophobic layer is T, and it satisfies the following conditions: 10nm <T<50nm。 10. The optical element according to claim 9, characterized in that The invention also comprises an adhesive, wherein the adhesive is disposed on the surface of the substrate and the adhesive is farther from the substrate than the hydrophobic layer.

11. The optical element according to claim 1, characterized in that The main component of the nanoparticles is one of SiO2, TiO2 and Al2O3.

12. An optical element, characterized in that: Include: a substrate; and A low reflection layer is disposed on a surface of the substrate, and the low reflection layer comprises: A plurality of nanoparticles, wherein the nanoparticles are stacked one on another, and the number of the nanoparticles decreases in a direction away from the substrate; The low-reflection layer is photographed by a scanning electron microscope from a bird's-eye view to obtain an image. The scanning electron microscope photographs an area of ​​1 μm 2 Up to 2000μm 2 , the number of pixels with grayscale values ​​of 100 to 150 in the image is G1015, and the number of pixels with grayscale values ​​of 200 to 250 in the image is G2025, which meets the following conditions: 3 <G1015 / G2025<40。 13. The optical element according to claim 12, characterized in that The average particle size of the nanoparticles is It meets the following conditions:

14. The optical element according to claim 13, characterized in that The average particle size of the nanoparticles is It meets the following conditions:

15. The optical element according to claim 12, characterized in that The scanning electron microscope photographs the low reflection layer in an area of ​​4 μm 2 Up to 130μm 2 .

16. The optical element according to claim 12, characterized in that The number of pixels with grayscale values ​​of 100 to 150 in the image is G1015, and the number of pixels with grayscale values ​​of 200 to 250 in the image is G2025, which meets the following conditions: 9 <G1015 / G2025<27。 17. The optical element according to claim 12, characterized in that The thickness of the low-reflection layer has ups and downs, and the height difference of the thickness of the low-reflection layer is D, which satisfies the following conditions: 120nm <D<650nm。 18. The optical element according to claim 17, characterized in that The height difference of the thickness of the low-reflection layer is D, which satisfies the following conditions: 200nm <D<450nm。 19. The optical element according to claim 17, characterized in that The low reflection layer further includes an intermediate layer, which is arranged between the substrate and the nanoparticles, and the thickness of the intermediate layer has high and low fluctuations.

20. The optical element according to claim 12, characterized in that The water contact angle of the surface of the substrate is θ, which satisfies the following conditions: 90 degrees <θ < 130 degrees.

21. The optical element according to claim 20, characterized in that The low-reflection layer further comprises a hydrophobic layer, the hydrophobic layer is farther away from the substrate than the nanoparticles, the thickness of the hydrophobic layer is T, and it satisfies the following conditions: 10nm <T<50nm。 22. The optical element according to claim 21, characterized in that The invention also comprises an adhesive, wherein the adhesive is disposed on the surface of the substrate and the adhesive is farther from the substrate than the hydrophobic layer.

23. The optical element according to claim 12, characterized in that The main component of the nanoparticles is one of SiO2, TiO2 and Al2O3.

24. An imaging lens, characterized in that: Include: The optical element according to claim 1 or claim 12, wherein an optical axis of the imaging lens passes through the optical element.

25. The imaging lens according to claim 24, characterized in that: The surface of the substrate is located at an object-side end of the optical element.

26. An electronic device, characterized in that: Include: The imaging lens according to claim 24; and An electronic photosensitive element is arranged on an imaging surface of the imaging lens.

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