Optical lens, image capturing device and electronic device

Abstract

The invention provides an optical lens, an image capturing device and an electronic device. The optical lens comprises at least five optical lenses from an object side to an image side. At least one optical lens of the at least five optical lenses comprises an anti-reflection coating film, the optical lens comprising the anti-reflection coating film is made of a plastic material, the anti-reflection coating film is located on the object side surface or the image side surface of the optical lens, the anti-reflection coating film comprises at least one film layer, and the film layer is located on the object side surface or the image side surface of the optical lens. The film layer located on the outer side of the anti-reflection coating film is made of metal oxide, the anti-reflection coating film comprises a plurality of holes, and the size of the holes adjacent to the outer side of the anti-reflection coating film is larger than that of the holes adjacent to the inner side of the anti-reflection coating film. Therefore, the optical lens with a plurality of optical lenses can obtain the optimal anti-reflection effect, and the imaging quality of the optical lens can be remarkably improved.

Description

[0001] This application is a divisional application of a patent application with an application date of December 22, 2021, application number 202111578440.1, and invention name “Optical lens, imaging device and electronic device”. Technical Field

[0002] The present disclosure relates to an optical lens and an imaging device, and more particularly to an anti-reflection optical lens and an imaging device. Background Art

[0003] The film layer prepared by the traditional anti-reflection coating technology is not effective enough in reducing the reflectivity in the wide-wavelength range, and the strong light in the long-wavelength region will cause the image quality to deteriorate, which cannot meet the high-quality lens requirements of high-end mobile devices. In addition, the number of lenses in the optical lens has increased significantly. With the increasing difficulty of optical system design and the increase in the number of lenses, it is a trend to develop coating technology with excellent anti-reflection effect in the wide-wavelength range on high-end multi-lens optical systems and drastically changing optical lenses. Summary of the invention

[0004] The present disclosure provides a multi-lens optical system, which uses a multi-layer coating design method and is designed with specific multiple anti-reflection coating factors to achieve an excellent wide-wavelength coating configuration equation. The sub-wavelength microstructure characteristics of the surface of the anti-reflection coating layer enable the high-quality optical system with multiple lenses to obtain the best wide-wavelength anti-reflection effect, while solving the problem of severe reflection of strong light at large angles that is difficult to overcome on optical lenses with drastic surface changes. It is particularly suitable for application to optical lenses with curved changes and materials with higher refractive indices, so that they can achieve uniform anti-reflection effects in the entire field of view and in a wide-wavelength range. When used in combination in a multi-lens optical system, it helps to significantly improve the imaging quality of high-end optical lenses.

[0005] According to the present disclosure, an optical lens is provided, which includes at least five optical lenses from the object side to the image side. At least one of the at least five optical lenses includes an anti-reflection coating, and the optical lens including the anti-reflection coating is a plastic lens. The anti-reflection coating is located on the object side surface or the image side surface of the optical lens. The anti-reflection coating includes a plurality of holes, and the size of the holes adjacent to the outer side of the anti-reflection coating is larger than the size of the holes adjacent to the inner side of the anti-reflection coating. The anti-reflection coating includes at least two film layers, the film layer located on the innermost side of the anti-reflection coating is a first film layer, and the film layer connected to the first film layer is a second film layer, and the second film layer is an Al2O3 film layer. The thickness of the optical lens on the optical axis is CT, the maximum value of the horizontal displacement between the intersection of the optical lens surface and the optical axis is SAGmax, the first factor of the anti-reflection coating configuration of the optical lens is Far1, Far1=|SAGmax| / CT, the average value of the tangent slope of the optical lens surface within the optical effective diameter range is SPavg, the minimum value of the tangent slope of the optical lens surface within the optical effective diameter range is SPmin, the second factor of the anti-reflection coating configuration of the optical lens is Far2, Far2=1 / (|SPavg|×|SPmin|), the refractive index of the optical lens material is Ns, the refractive index of the first film layer material is N1, and the ultra-wideband factor when the optical lens is configured with anti-reflection coating is Farw, Farw=100×((N1-Ns) / (N1+Ns)) 2 The main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR = LOG (Far1 × Far2 × Farw), which satisfies the following conditions: -7.000≤FAR<0.

[0006] According to the present disclosure, an imaging device is provided, which includes the optical lens as described in the previous paragraph and an electronic photosensitive element, and the electronic photosensitive element is disposed on an imaging surface of the optical lens.

[0007] According to the present disclosure, an electronic device is provided, which is a mobile device, and the electronic device includes the imaging device as described in the previous paragraph.

[0008] When FAR meets the above conditions, by configuring the anti-reflection coating on the most appropriate optical lens surface in the optical system and adjusting the combination of the optical lens material and the first film layer material, it helps to achieve the best wide-wavelength anti-reflection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to make the above and other objects, features, advantages and embodiments of the present disclosure more clearly understood, the accompanying drawings are described as follows:

[0010] Figure 1 A schematic diagram of an image capturing device according to a first embodiment of the present disclosure;

[0011] Figure 2 for Figure 1 A schematic diagram of a diffractive element of an imaging device;

[0012] Figure 3 for Figure 1 A partially enlarged schematic diagram of an anti-reflection coating of an imaging device;

[0013] Figure 4 is a graph showing the relationship between the reflectivity and wavelength of an optical lens of a comparative example;

[0014] Figure 5 is a graph showing the relationship between the reflectivity and wavelength of an optical lens of the third embodiment;

[0015] Figure 6 is a graph showing the relationship between the reflectivity and wavelength of an optical lens of the fourth embodiment;

[0016] Figure 7 is a graph showing the relationship between the reflectivity and wavelength of an optical lens of the seventh embodiment;

[0017] Figure 8 is a graph showing the relationship between the reflectivity and wavelength of an optical lens of the eighth embodiment;

[0018] Fig. 9 is a graph showing the relationship between the reflectivity and wavelength of an optical lens of the ninth embodiment;

[0019] Fig. 10A This is a lens image quality test chart of the optical lens of the comparative example under strong incident light at 40 degrees;

[0020] Fig. 10B A lens image quality test chart of the optical lens of the fourth embodiment under 40-degree incident strong light; and

[0021] Fig.11 FIG. 4 is a cross-sectional view of an optical lens including an anti-reflection coating according to a fourth embodiment.

[0022]

Explanation of symbols

[0023] 110: Lens tube element

[0024] 111: Outer surface

[0025] 112: Inner surface

[0026] 120: Shading element

[0027] 121,131,141: Surface

[0028] 130: Spacer element

[0029] 140: Diffraction element

[0030] 151: Imaging surface

[0031] 152: Electronic photosensitive element

[0032] NH: refractive index of high refractive index material

[0033] NL: refractive index of low refractive index material

[0034] Ns: refractive index of optical lens material

[0035] N1: Refractive index of the first film layer material

[0036] N2: Refractive index of the second film material

[0037] TL1: Thickness of the first film layer

[0038] TL2: thickness of the second film layer

[0039] tLs: Total number of anti-reflection coating layers

[0040] tTk: Total film thickness of anti-reflection coating

[0041] Far1: Anti-reflection coating configuration first factor

[0042] Far2: Anti-reflection coating configuration second factor

[0043] Farw: Ultra-wideband factor

[0044] FAR: Main factors for anti-reflection coating configuration

[0045] CT: Thickness of optical lens on the optical axis

[0046] SAGmax: Maximum value of horizontal displacement

[0047] SPavg: average value of tangent slope

[0048] SPmin: minimum value of tangent slope

[0049] Wtmin: valley wavelength of minimum reflectivity

[0050] Rtmin: The reflectivity of the valley point with the lowest reflectivity

[0051] R4060: Average reflectivity at wavelength 400nm–600nm

[0052] R4070: Average reflectivity at wavelengths of 400nm–700nm

[0053] R40100: Average reflectivity at wavelengths of 400nm–1000nm

[0054] R5060: Average reflectivity at wavelength 500nm–600nm

[0055] R6070: Average reflectivity at wavelength 600nm–700nm

[0056] R6080: Average reflectivity at wavelength 600nm–800nm

[0057] R70100: Average reflectivity at wavelengths of 700nm–1000nm

[0058] R80100: Average reflectivity at wavelengths of 800nm–1000nm

[0059] R90100: Average reflectivity at wavelength 900nm–1000nm

[0060] R40: Reflectivity at a wavelength of 400nm

[0061] R50: Reflectivity at a wavelength of 500nm

[0062] R60: Reflectivity at a wavelength of 600nm

[0063] R70: Reflectivity at a wavelength of 700nm

[0064] R80: Reflectivity at a wavelength of 800nm

[0065] R90: Reflectivity at a wavelength of 900nm

[0066] R100: Reflectivity at a wavelength of 1000nm

[0067] FOV: Full field of view

[0068] T1, T2, T3, T4, T5: Valley points

[0069] L1, L2, L3, L4, L5, L6, L7, L8, L9: Optical lenses

[0070] R1: Object side surface

[0071] R2: Image side surface

[0072] A1: Object side effective diameter area

[0073] A2: Image side effective diameter area

[0074] A3: Non-effective diameter area DETAILED DESCRIPTION

[0075] The present disclosure provides an optical lens, which includes at least five optical lenses from the object side to the image side. At least one of the at least five optical lenses includes an anti-reflection coating, the optical lens including the anti-reflection coating is made of a plastic material, the anti-reflection coating is located on the object side surface or the image side surface of the optical lens, the anti-reflection coating includes at least one film layer, the film layer located on the outside of the anti-reflection coating is made of a metal oxide, the anti-reflection coating includes a plurality of holes, and the size of the hole adjacent to the outside of the anti-reflection coating is larger than the size of the hole adjacent to the inside of the anti-reflection coating.

[0076] The refractive index of the optical lens material is Ns. The innermost film layer of the anti-reflection coating is the first film layer. The refractive index of the first film layer material is N1, which meets the following conditions: N1 <Ns。

[0077] The thickness of the first film layer is TL1, which satisfies the following conditions: 50 nm ≤ TL1 ≤ 200 nm. Furthermore, the following conditions may be satisfied: 80 nm ≤ TL1 ≤ 150 nm.

[0078] The refractive index of the optical lens material is Ns, the refractive index of the first film layer material is N1, and the ultra-wideband factor when the optical lens is equipped with an anti-reflection coating is Farw. Farw represents the difference factor between the refractive index of the optical lens and the refractive index of the first film layer. Farw=100×((N1-Ns) / (N1+Ns)) 2 , which satisfies the following conditions: Farw≤0.60. Furthermore, the following conditions may be satisfied: Farw≤0.50; Farw≤0.45; Farw≤0.40; Farw≤0.30; or 0≤Farw≤0.10.

[0079] The present disclosure provides a multi-lens optical system, which uses a multi-layer coating design method and is designed with specific multiple anti-reflection coating factors to achieve an excellent wide-wavelength coating configuration equation. The sub-wavelength microstructure characteristics of the surface of the anti-reflection coating layer enable the high-quality optical system with multiple lenses to obtain the best wide-wavelength anti-reflection effect, while solving the problem of severe reflection of strong light at large angles that is difficult to overcome on optical lenses with drastic surface changes. It is particularly suitable for application to optical lenses with curved changes and materials with higher refractive indices, so that they can achieve uniform anti-reflection effects in the entire field of view and in a wide-wavelength range. When used in combination in a multi-lens optical system, it helps to significantly improve the imaging quality of high-end optical lenses.

[0080] The thickness of the optical lens on the optical axis is CT, the maximum horizontal displacement between the intersection of the optical lens surface and the optical axis is SAGmax, the first factor of the anti-reflection coating configuration of the optical lens is Far1, Far1 represents the relationship factor between the thickness of the optical lens and the off-axis horizontal displacement, Far1 = |SAGmax| / CT, which can meet the following conditions: 0.500≤Far1, by controlling the relationship factor between the thickness of the optical lens and the off-axis horizontal displacement in the optical system, the best wide-wavelength coating configuration in the optical system can be effectively obtained. Furthermore, the following conditions can be met: 1.000≤Far1; 1.500≤Far1≤5; 1.700≤Far1≤10; or 2.000≤Far1≤100.

[0081] The average value of the tangent slope of the optical lens surface within the optical effective diameter range is SPavg, the minimum value of the tangent slope of the optical lens surface within the optical effective diameter range is SPmin, the second factor of the anti-reflection coating configuration of the optical lens is Far2, Far2 represents the variation factor of the off-axis surface of the optical lens, Far2 = 1 / (|SPavg|×|SPmin|), which can meet the following conditions: 0.100≤Far2, by controlling the variation factor of the off-axis surface of the optical lens in the optical system, the best wide-band coating configuration and application value of high-order coating in the optical system can be effectively obtained. Furthermore, the following conditions can be met: 0.200≤Far2≤0.7; 0.300≤Far2≤0.8; 0.400≤Far2≤0.9; or 0.500≤Far2≤1.

[0082] The first factor of the anti-reflection coating configuration of the optical lens is Far1, the second factor of the anti-reflection coating configuration of the optical lens is Far2, the ultra-wideband factor when the optical lens is configured with anti-reflection coating is Farw, and the main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR=LOG(Far1×Far2×Farw), which can meet the following conditions: -7.000≤FAR, by configuring the anti-reflection coating on the most appropriate optical lens surface in the optical system, and adjusting the combination of the optical lens material and the first film layer material, so that the light can pass through the film layer from the air end in a gradient refractive index change manner and then enter the optical lens, it is helpful to exert the best wide-band anti-reflection effect. Furthermore, the following conditions can be met: -5.000≤FAR; -4.000≤FAR; -2.500≤FAR; -2.000≤FAR<0; or -2.000≤FAR≤-1.000.

[0083] The refractive index of the optical lens material is Ns, which can meet the following conditions: 1.530≤Ns≤1.690. By combining an optical lens with an appropriate refractive index and a film layer with a low refractive index in the middle, the anti-reflection effect of the film layer can be effectively enhanced, which helps to strengthen the effect of reducing the reflectivity. Furthermore, the following conditions can be met: 1.400≤Ns≤1.768; or 1.500≤Ns≤1.700.

[0084] The refractive index of the first film layer material is N1, which can meet the following conditions: 1.37≤N1≤1.63. By using a material with a low refractive index, the effect of the gradient refractive index can be effectively enhanced.

[0085] The material of the first film layer may be SiO2. Selecting a low refractive index material to prepare the film layer that contacts the optical lens helps to obtain the best gradient refractive index effect.

[0086] The anti-reflection coating may include at least two film layers of different main materials. By selecting a low refractive index material to prepare the film layer in the middle, a gradual gradient refractive index change can be effectively achieved, effectively exerting the effect of reducing reflectivity in a wide wavelength range.

[0087] The valley wavelength of the optical lens with the lowest reflectivity is Wtmin, which can meet the following conditions: 400nm≤Wtmin≤750nm. By controlling the lowest valley reflectivity to fall within a specific wavelength range, it helps to maintain a consistent low reflection effect in the short wavelength and long wavelength regions. Furthermore, the following conditions can be met: 450nm≤Wtmin≤740nm; 500nm≤Wtmin≤730nm; 550nm≤Wtmin≤720nm; or 600nm≤Wtmin≤710nm.

[0088] The valley point reflectivity of the optical lens with the lowest reflectivity is Rtmin, which can meet the following conditions: 0.01%≤Rtmin≤0.50%. By lowering the valley point reflectivity of the optical lens, it helps to enhance the anti-reflection effect of the film layer at a specific wavelength.

[0089] The average reflectivity of the optical lens at a wavelength of 400nm-1000nm is R40100, which can meet the following conditions: 0.05%≤R40100≤1.5%, so as to effectively control the overall low reflectivity in the ultra-wide wave range.

[0090] The reflectivity of the optical lens at a wavelength of 700 nm is R70, which can meet the following conditions: 0.01%≤R70≤1.0%, so as to effectively control the low reflectivity at a specific wavelength.

[0091] At least one surface of an optical lens including an anti-reflection coating may include at least one inflection point. The inflection point design of the optical lens surface disclosed herein helps to maximize the cost-effectiveness of coating using atomic layer deposition, and can achieve a uniform coating effect on the surface of the optical lens with drastic changes in surface shape, thereby avoiding the reflectivity shifting due to differences in film thickness, which may lead to the defect of excessive peripheral reflected light.

[0092] The total number of layers of the anti-reflection coating is tLs, which can meet the following conditions: 1≤tLs≤2. By controlling the number of film layers, the production efficiency can be effectively improved and the cost can be saved.

[0093] The film layer connected to the first film layer is a second film layer, and the thickness of the second film layer is TL2, which can meet the following conditions: 100nm≤TL2≤250nm. By controlling the thickness of the second film layer, it is helpful to achieve the best anti-reflection effect.

[0094] The total thickness of the anti-reflection coating is tTk, which can meet the following conditions: 100nm≤tTk≤300nm. By controlling the total thickness of the anti-reflection coating, the overall low reflection effect in the wide wave range can be effectively maintained. Furthermore, the following conditions can be met: 200nm≤tTk≤250nm.

[0095] Another embodiment of the present disclosure provides an imaging device, which includes the aforementioned optical lens and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the optical lens.

[0096] Another embodiment of another aspect of the present disclosure provides an imaging device, which includes the aforementioned optical lens, a diffractive element (Fresnel Lens) and an electronic photosensitive element, at least one surface of the diffractive element includes an anti-reflection coating, the anti-reflection coating of the diffractive element is made of aluminum oxide, and the electronic photosensitive element is disposed on an imaging surface of the optical lens. The present disclosure designs and manufactures a wide-band anti-reflection film layer on the diffractive element, which can solve the high reflection problem of the diffractive element at the turning point of the surface shape.

[0097] Another aspect of the present disclosure provides an electronic device, which is a mobile device and includes the aforementioned imaging device.

[0098] The full viewing angle of the optical lens is FOV, which can meet the following conditions: 60 degrees ≤ FOV ≤ 220 degrees; or 70 degrees ≤ FOV ≤ 100 degrees.

[0099] The average reflectivity of the optical lens at a wavelength of 400nm-700nm is R4070, which can meet the following conditions: 0.05%≤R4070≤1.5%, thereby effectively controlling the low reflectivity in the ultra-wide-wave visible light region.

[0100] The average reflectivity of the optical lens at a wavelength of 400nm-600nm is R4060, which can meet the following conditions: 0.05%≤R4060≤1.5%, thereby effectively controlling the low reflectivity in the wide-wave blue light and green light regions.

[0101] The average reflectivity of the optical lens at a wavelength of 500nm-600nm is R5060, which can meet the following conditions: 0.01%≤R5060≤1.0%, thereby effectively controlling the low reflectivity in the wide-wave green light region.

[0102] The average reflectivity of the optical lens at a wavelength of 600nm-700nm is R6070, which can meet the following conditions: 0.01%≤R6070≤1.0%, thereby effectively controlling the low reflectivity in the wide-wave red light region.

[0103] The average reflectivity of the optical lens at a wavelength of 600nm-800nm ​​is R6080, which can meet the following conditions: 0.01%≤R6080≤1.0%, thereby effectively controlling the low reflectivity in the wide-wave red light region.

[0104] The average reflectivity of the optical lens at a wavelength of 700nm-1000nm is R70100, which can meet the following conditions: 0.05%≤R70100≤2.0%, thereby effectively controlling the low reflectivity in the wide-wavelength and long-wavelength region.

[0105] The average reflectivity of the optical lens at a wavelength of 800nm-1000nm is R80100, which can meet the following conditions: 0.05%≤R80100≤2.5%, thereby effectively controlling the low reflectivity in the wide-wavelength and long-wavelength region.

[0106] The average reflectivity of the optical lens at a wavelength of 900nm-1000nm is R90100, which can meet the following conditions: 0.10%≤R90100≤5.0%, thereby effectively controlling the low reflectivity in the wide-wavelength and long-wavelength region.

[0107] The reflectivity of the optical lens at a wavelength of 400nm is R40, which can meet the following conditions: 0.10%≤R40≤35%, thereby effectively controlling the low reflectivity of blue visible light wavelengths in the wide wave range.

[0108] The reflectivity of the optical lens at a wavelength of 500nm is R50, which can meet the following conditions: 0.01%≤R50≤1.0%, thereby effectively controlling the low reflectivity of the green visible light wavelength in the wide wave range.

[0109] The reflectivity of the optical lens at a wavelength of 600nm is R60, which can meet the following conditions: 0.01%≤R60≤1.0%, thereby effectively controlling the low reflectivity of red visible light wavelengths in the wide wave range.

[0110] The reflectivity of the optical lens at a wavelength of 700nm is R70, which can meet the following conditions: 0.01%≤R70≤1.0%, thereby effectively controlling the low reflectivity in the long wavelength region in the wide wave domain.

[0111] The reflectivity of the optical lens at a wavelength of 800nm ​​is R80, which can meet the following conditions: 0.01%≤R80≤1.0%, thereby effectively controlling the low reflectivity of wavelengths in the long wavelength region in the wide wave domain.

[0112] The reflectivity of the optical lens at a wavelength of 900nm is R90, which can meet the following conditions: 0.10%≤R90≤1.5%, thereby effectively controlling the low reflectivity of wavelengths in the long wavelength region in the wide wave domain.

[0113] The reflectivity of the optical lens at a wavelength of 1000nm is R100, which can meet the following conditions: 0.10%≤R100≤10%, thereby effectively controlling the low reflectivity of wavelengths in the long wavelength region in the wide wave domain.

[0114] The refractive index of the second film layer material is N2, the refractive index of the high refractive index material of the anti-reflection coating is NH, and the refractive index of the low refractive index material of the anti-reflection coating is NL.

[0115] The composition of the excellent quality optical lens disclosed in the present invention must be optimized by comprehensively evaluating parameters such as the anti-reflection coating factor, such as the ultra-wide waveband coating factor, the first factor, the second factor, and the main factor, and then an anti-reflection coating is made on the surface of a specific plastic optical lens so that the anti-reflection coating has the best anti-reflection effect and good imaging quality.

[0116] The anti-reflective coating design can be appropriately changed and applied to optical lenses of optical systems of other embodiments, and the number of film layers, optical lens materials, high refractive index coating materials or low refractive index coating materials can be changed as needed. After evaluating various optimal configuration factors, it can be applied to different optical systems and the most suitable optical lenses.

[0117] The present disclosure defines at least one trough in the wavelength range of 400 nm-1000 nm, wherein the at least one trough is defined sequentially from a short wavelength to a long wavelength.

[0118] The order of the valley points is defined based on the center, from short wavelength to long wavelength, in order of T1, T2, T3, etc., and increases in this order.

[0119] It is best to coat both sides of the anti-reflective coating, but it can also be produced on only one appropriate surface. By applying the technology disclosed in this disclosure to the most appropriate surface, the coating produced by atomic layer deposition has optimized value, achieving a balance between cost and quality, and is produced on optical lens materials with the most appropriate refractive index, so that the anti-reflective effect can be achieved to the best effect.

[0120] The reflectivity data of the present disclosure is measured on a single surface of an optical lens, and the reflectivity data at an incident angle of 0 degrees is used as a comparison benchmark.

[0121] The surface pore formation process can effectively improve the distribution of surface holes, increase the gap between the holes on the surface, present a sponge-like structure, or change the pore density. The pore formation effect can also change with the increase of depth, such as the outer side in contact with the air has a larger pore structure, while the deeper inner side has a relatively smaller pore structure. The pores are composed of spaces between irregular nanofiber structures (nanofiber), which have the effect of allowing air to remain or connect between the pores. The outer side and the inner side of the anti-reflection film layer refer to the cross-sectional view and the schematic diagram. The outer side is the side in contact with the air, and the inner side is the side closer to the substrate. The holes / gaps distributed on the outer side are relatively larger than the holes on the inner side. It can also be explained that in the same plane, the distribution density of the irregular branched structure on the outer side is sparser, and the distribution density of the irregular branched structure on the inner side is denser. The surface pore formation process can be achieved by using plasma etching, chemical reaction etching, time-controlled crystal particle size technology or high-temperature solution treatment, such as immersion in alcohol or water at a temperature above 50 degrees.

[0122] The refractive index of the high refractive index material of the anti-reflection coating disclosed in the present invention is greater than 2.0, and the refractive index of the low refractive index material is less than 1.8. The anti-reflection coating material (refractive index at a wavelength of 587.6nm) can be, for example: magnesium fluoride (MgF2, 1.3777), silicon dioxide (SiO2, 1.4585), thorium fluoride (ThF4, 1.5125), silicon monoxide (SiO, 1.55), cerium fluoride (CeF3, 1.63), aluminum oxide (Al2O3, 1.7682), yttrium trioxide (Y2O3, 1.79), hafnium dioxide (HfO2, 1.8935), zinc oxide (ZnO, 1.8935), and the like. nO, 1.9269), scandium oxide (Sc2O3, 1.9872), aluminum nitride (AlN, 2.0294), silicon nitride (Si3N4, 2.0381), tantalum pentoxide (Ta2O5, 2.1306), zirconium dioxide (ZrO2, 2.1588), zinc sulfide (ZnS, 2.2719), niobium pentoxide (Nb2O5, 2.3403), titanium dioxide (TiO2, 2.6142), titanium nitride (TiN, 3.1307). Or it can be a mixture of magnesium fluoride-silicon dioxide (MgF2-SiO2), in which the content ratio of each component is [SiO2]>[MgF2].

[0123] The first coating material (N1) near the surface of the plastic optical lens material can be configured as a low refractive index material such as magnesium fluoride (MgF2, 1.3777), silicon dioxide (SiO2, 1.4585), thorium fluoride (ThF4, 1.5125), silicon monoxide (SiO, 1.55), cerium fluoride (CeF3, 1.63), or a mixture of magnesium fluoride-silicon dioxide (MgF2-SiO2), wherein the content ratio of each component is [SiO2]>[MgF2]. The second coating material (N2) can be configured as aluminum nitride (AlN), aluminum oxide (Al2O3), aluminum hydroxide (Al(OH)3) or an aluminum-containing mixture.

[0124] The anti-reflective coating disclosed in the present invention can be deposited on the surface of a plastic optical lens as a single layer or a multilayer film, and can adopt a physical vapor deposition method (PVD), such as evaporation deposition or sputtering deposition, or a chemical vapor deposition method (CVD), such as ultra-high vacuum chemical vapor deposition, microwave plasma assisted chemical vapor deposition, plasma enhanced chemical vapor deposition or atomic layer deposition (ALD), etc.

[0125] The full field of view disclosed herein is the range from the central field of view (0Field) to the maximum image height field of view (1.0Field), and the full field of view covers the optically effective area of ​​the surface of the optical lens.

[0126] The tangent slope of the optical lens surface is calculated when the optical axis is horizontal, and the tangent slope is infinite (Infinity, INF, ∞) near the optical axis.

[0127] The optical lens also has a diffraction element (Fresnel lens), the surface of which has an anti-reflection coating made of aluminum oxide.

[0128] Plastic optical lenses will have large surface shape errors due to thickness and high temperature. The more layers of film there are, the more obvious the temperature effect on surface shape accuracy will be. Lens correction technology can effectively solve the temperature effect problem when coating the plastic surface, which helps maintain the coating integrity of the optical lens and the high precision of the plastic optical lens, and is a key technology for achieving high-quality imaging lenses.

[0129] Lens correction technology can be applied to mold flow analysis method, curve fitting function method or wavefront error method, but not limited to them. The mold flow analysis method is to find the three-dimensional contour node of the optical lens surface shrinking in the Z axis through mold flow analysis, convert it into an aspheric curve, and then compare the difference with the original curve, and calculate the correction value by considering the material shrinkage rate and surface deformation trend. The curve fitting function method is to measure the contour error of the component surface, fit the curve with a function, and then use the optimization algorithm to approximate the fitting curve to the measurement point to obtain the correction value. The function can be exponential or polynomial, and the algorithm can be Gauss Newton method, simplex algorithm or steepest descent method. The wavefront error method is to measure the wavefront error (imaging error) data of the optical system through an interferometer, and then use the original design value wavefront error to comprehensively analyze the wavefront error generated by manufacturing and assembly, and obtain the correction value through optical software optimization.

[0130] Based on the above description, specific embodiments are presented below for detailed description.

[0131] <First Embodiment>

[0132] Please refer to Figure 1 , Figure 1 FIG. 1 is a schematic diagram of an image capturing device according to a first embodiment of the present disclosure. Figure 1 It can be seen that the imaging device of the first embodiment includes an optical lens (not labeled) and an electronic photosensitive element 152. The optical lens includes five optical lenses (not shown) and an imaging surface 151 from the object side to the image side, and the electronic photosensitive element 152 is disposed on the imaging surface 151 of the optical lens. The full viewing angle of the optical lens of the first embodiment is FOV, which satisfies the following condition: FOV = 74.74 degrees.

[0133] The five optical lenses are optical lens L1, optical lens L2, optical lens L3, optical lens L4 and optical lens L5 from the object side to the image side. At least one of the five optical lenses includes an anti-reflection coating, and the optical lens including the anti-reflection coating is made of a plastic material. The anti-reflection coating is located on the object side surface or the image side surface of the optical lens. The anti-reflection coating includes at least one film layer, and the material of the film layer located on the outside of the anti-reflection coating is metal oxide. The anti-reflection coating includes a plurality of holes, and the size of the holes adjacent to the outside of the anti-reflection coating is larger than the size of the holes adjacent to the inside of the anti-reflection coating.

[0134] The ultra-wideband factor when the optical lens L1 is configured with an anti-reflection coating is Farw, which satisfies the following conditions: Farw = 0.071. The first factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L1 is Far1, the second factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L1 is Far2, and the main factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L1 is FAR, which satisfies the following conditions: Far1 = 0.535; Far2 = 0.295; and FAR = -1.950. The first factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L1 is Far1, the second factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L1 is Far2, and the main factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L1 is FAR, which satisfies the following conditions: Far1=0.010; Far2=0.012; and FAR=-5.050.

[0135] The thickness of the optical lens L1 on the optical axis is CT, which satisfies the following condition: CT = 0.63. The innermost film layer of the anti-reflection coating is the first film layer, the refractive index of the material of the first film layer is N1, and the refractive index of the material of the optical lens L1 is Ns, which satisfies the following condition: Ns = 1.54.

[0136] The maximum horizontal displacement between the object side surface R1 of the optical lens L1 and the intersection with the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.34. The average value of the tangent slope of the object side surface R1 of the optical lens L1 within the optical effective diameter range is SPavg, which satisfies the following condition: |SPavg|=2.67. The minimum value of the tangent slope of the object side surface R1 of the optical lens L1 within the optical effective diameter range is SPmin, which satisfies the following condition: |SPmin|=1.27.

[0137] The maximum horizontal displacement between the intersection of the image side surface R2 of the optical lens L1 and the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.01. The average value of the tangent slope of the image side surface R2 of the optical lens L1 within the optical effective diameter is SPavg, which satisfies the following condition: |SPavg|=29.41. The minimum value of the tangent slope of the image side surface R2 of the optical lens L1 within the optical effective diameter is SPmin, which satisfies the following condition: |SPmin|=2.79.

[0138] The ultra-wideband factor when the optical lens L2 is configured with an anti-reflection coating is Farw, which satisfies the following conditions: Farw = 0.334. The first factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L2 is Far1, the second factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L2 is Far2, and the main factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L2 is FAR, which satisfies the following conditions: Far1 = 0.058; Far2 = 0.003; and FAR = -4.271. The first factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L2 is Far1, the second factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L2 is Far2, and the main factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L2 is FAR, which satisfies the following conditions: Far1=0.730; Far2=0.156; and FAR=-1.421.

[0139] The thickness of the optical lens L2 on the optical axis is CT, which satisfies the following condition: CT = 0.25. The innermost film layer of the anti-reflection coating is the first film layer, the refractive index of the material of the first film layer is N1, and the refractive index of the material of the optical lens L2 is Ns, which satisfies the following condition: Ns = 1.64.

[0140] The maximum horizontal displacement between the object side surface R1 of the optical lens L2 and the intersection with the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.01. The average value of the tangent slope of the object side surface R1 of the optical lens L2 within the optical effective diameter range is SPavg, which satisfies the following condition: |SPavg|=43.48. The minimum value of the tangent slope of the object side surface R1 of the optical lens L2 within the optical effective diameter range is SPmin, which satisfies the following condition: |SPmin|=8.33.

[0141] The maximum horizontal displacement between the intersection of the image side surface R2 of the optical lens L2 and the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.18. The average value of the tangent slope of the image side surface R2 of the optical lens L2 within the optical effective diameter is SPavg, which satisfies the following condition: |SPavg|=4.61. The minimum value of the tangent slope of the image side surface R2 of the optical lens L2 within the optical effective diameter is SPmin, which satisfies the following condition: |SPmin|=1.39.

[0142] The ultra-wideband factor when the optical lens L3 is configured with an anti-reflection coating is Farw, which satisfies the following conditions: Farw = 0.334. The first factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L3 is Far1, the second factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L3 is Far2, and the main factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L3 is FAR, which satisfies the following conditions: Far1 = 0.370; Far2 = 0.031; and FAR = -2.411. The first factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L3 is Far1, the second factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L3 is Far2, and the main factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L3 is FAR, which satisfies the following conditions: Far1=0.327; Far2=0.018; and FAR=-2.695.

[0143] The thickness of the optical lens L3 on the optical axis is CT, which satisfies the following condition: CT = 0.26. The innermost film layer of the anti-reflection coating is the first film layer, the refractive index of the material of the first film layer is N1, and the refractive index of the material of the optical lens L3 is Ns, which satisfies the following condition: Ns = 1.64.

[0144] The maximum horizontal displacement between the object side surface R1 of the optical lens L3 and the intersection with the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.10. The average value of the tangent slope of the object side surface R1 of the optical lens L3 within the optical effective diameter is SPavg, which satisfies the following condition: |SPavg|=9.09. The minimum value of the tangent slope of the object side surface R1 of the optical lens L3 within the optical effective diameter is SPmin, which satisfies the following condition: |SPmin|=3.50.

[0145] The maximum horizontal displacement between the image side surface R2 of the optical lens L3 and the intersection with the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.09. The average value of the tangent slope of the image side surface R2 of the optical lens L3 within the optical effective diameter range is SPavg, which satisfies the following condition: |SPavg|=11.90. The minimum value of the tangent slope of the image side surface R2 of the optical lens L3 within the optical effective diameter range is SPmin, which satisfies the following condition: |SPmin|=4.55.

[0146] The ultra-wideband factor when the optical lens L4 is configured with an anti-reflection coating is Farw, which satisfies the following conditions: Farw = 0.078. The first factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L4 is Far1, the second factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L4 is Far2, and the main factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L4 is FAR, which satisfies the following conditions: Far1 = 0.228; Far2 = 0.021; and FAR = -3.415. The first factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L4 is Far1, the second factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L4 is Far2, and the main factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L4 is FAR, which satisfies the following conditions: Far1=0.765; Far2=0.159; and FAR=-2.020.

[0147] The thickness of the optical lens L4 on the optical axis is CT, which satisfies the following condition: CT = 0.64. The innermost film layer of the anti-reflection coating is the first film layer, the refractive index of the material of the first film layer is N1, and the refractive index of the material of the optical lens L4 is Ns, which satisfies the following condition: Ns = 1.54.

[0148] The maximum horizontal displacement between the object side surface R1 of the optical lens L4 and the intersection with the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.15. The average value of the tangent slope of the object side surface R1 of the optical lens L4 within the optical effective diameter is SPavg, which satisfies the following condition: |SPavg|=9.26. The minimum value of the tangent slope of the object side surface R1 of the optical lens L4 within the optical effective diameter is SPmin, which satisfies the following condition: |SPmin|=5.03.

[0149] The maximum horizontal displacement between the intersection of the image side surface R2 of the optical lens L4 and the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.49. The average value of the tangent slope of the image side surface R2 of the optical lens L4 within the optical effective diameter is SPavg, which satisfies the following condition: |SPavg|=3.17. The minimum value of the tangent slope of the image side surface R2 of the optical lens L4 within the optical effective diameter is SPmin, which satisfies the following condition: |SPmin|=1.98.

[0150] The ultra-wideband factor when the optical lens L5 is configured with an anti-reflection coating is Farw, which satisfies the following conditions: Farw = 0.078. The first factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L5 is Far1, the second factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L5 is Far2, and the main factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L5 is FAR, which satisfies the following conditions: Far1 = 1.911; Far2 = 0.172; and FAR = -1.588. The first factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L5 is Far1, the second factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L5 is Far2, and the main factor of the anti-reflective coating configuration of the image side surface R2 of the optical lens L5 is FAR, which satisfies the following conditions: Far1=1.272; Far2=0.262; and FAR=-1.582.

[0151] The thickness of the optical lens L5 on the optical axis is CT, which satisfies the following condition: CT = 0.32. The innermost film layer of the anti-reflection coating is the first film layer, the refractive index of the material of the first film layer is N1, and the refractive index of the material of the optical lens L5 is Ns, which satisfies the following condition: Ns = 1.54.

[0152] The maximum horizontal displacement between the object side surface R1 of the optical lens L5 and the intersection with the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.62. The average value of the tangent slope of the object side surface R1 of the optical lens L5 within the optical effective diameter is SPavg, which satisfies the following condition: |SPavg|=3.32. The minimum value of the tangent slope of the object side surface R1 of the optical lens L5 within the optical effective diameter is SPmin, which satisfies the following condition: |SPmin|=1.75.

[0153] The maximum horizontal displacement between the intersection of the image side surface R2 of the optical lens L5 and the optical axis is SAGmax, which satisfies the following condition: |SAGmax|=0.41. The average value of the tangent slope of the image side surface R2 of the optical lens L5 within the optical effective diameter range is SPavg, which satisfies the following condition: |SPavg|=3.45. The minimum value of the tangent slope of the image side surface R2 of the optical lens L5 within the optical effective diameter range is SPmin, which satisfies the following condition: |SPmin|=1.11.

[0154] Please refer to Figure 2 and Figure 3 , Figure 2 for Figure 1 A schematic diagram of a diffractive element 140 of an imaging device, Figure 3 for Figure 1 The imaging device of the first embodiment may further include a lens barrel element 110, a shading element 120, a spacer element 130, and a diffractive element 140, wherein an anti-reflective coating may be disposed on an outer surface 111 of the lens barrel element 110, an inner surface 112 of the lens barrel element 110, a surface 121 of the shading element 120, a surface 131 of the spacer element 130, a surface 141 of the diffractive element 140, an object side effective diameter area A1 of the optical lens in the optical lens, an image side effective diameter area A2 of the optical lens in the optical lens, and a non-effective diameter area A3 of the optical lens in the optical lens, and the anti-reflective coating has the following characteristics: Figure 3 The structure shown.

[0155] The detailed parameters of the optical lenses included in the optical lens of the first embodiment are listed in Table 1 below.

[0156]

[0157]

[0158] <Second Embodiment>

[0159] The imaging device of the second embodiment includes an optical lens and an electronic photosensitive element. The optical lens includes six optical lenses and an imaging surface from the object side to the image side, and the electronic photosensitive element is disposed on the imaging surface of the optical lens. The full viewing angle of the optical lens of the second embodiment is FOV, which satisfies the following condition: FOV = 85.45 degrees.

[0160] The six optical lenses are optical lens L1, optical lens L2, optical lens L3, optical lens L4, optical lens L5 and optical lens L6 from the object side to the image side. At least one of the six optical lenses includes an anti-reflection coating. The optical lens including the anti-reflection coating is made of a plastic material. The anti-reflection coating is located on the object side surface or the image side surface of the optical lens. The anti-reflection coating includes at least one film layer. The material of the film layer located on the outside of the anti-reflection coating is metal oxide. The anti-reflection coating includes a plurality of holes, and the size of the holes adjacent to the outside of the anti-reflection coating is larger than the size of the holes adjacent to the inside of the anti-reflection coating. Each optical lens has an object side surface R1 and an image side surface R2.

[0161] The detailed parameters of the optical lenses included in the optical lens of the second embodiment are listed in Table 2 below, and the parameter definitions in Table 2 are the same as those in the first embodiment, which will not be repeated here.

[0162]

[0163]

[0164]

[0165] <Third Embodiment>

[0166] The imaging device of the third embodiment includes an optical lens and an electronic photosensitive element. The optical lens includes seven optical lenses and an imaging surface from the object side to the image side, and the electronic photosensitive element is disposed on the imaging surface of the optical lens. The full viewing angle of the optical lens of the third embodiment is FOV, which satisfies the following condition: FOV = 78.95 degrees.

[0167] The seven optical lenses are optical lens L1, optical lens L2, optical lens L3, optical lens L4, optical lens L5, optical lens L6 and optical lens L7 from the object side to the image side. At least one of the seven optical lenses includes an anti-reflection coating. The optical lens including the anti-reflection coating is made of a plastic material. The anti-reflection coating is located on the object side surface or the image side surface of the optical lens. The anti-reflection coating includes at least one film layer. The material of the film layer located on the outside of the anti-reflection coating is metal oxide. The anti-reflection coating includes a plurality of holes, and the size of the holes adjacent to the outside of the anti-reflection coating is larger than the size of the holes adjacent to the inside of the anti-reflection coating. Each optical lens has an object side surface R1 and an image side surface R2.

[0168] The detailed parameters of the optical lenses included in the optical lens of the third embodiment are listed in Table 3 below, and the parameter definitions in Table 3 are the same as those in the first embodiment, which will not be repeated here.

[0169]

[0170]

[0171]

[0172] <Fourth Embodiment>

[0173] The imaging device of the fourth embodiment includes an optical lens and an electronic photosensitive element. The optical lens includes seven optical lenses and an imaging surface from the object side to the image side, and the electronic photosensitive element is disposed on the imaging surface of the optical lens. The full viewing angle of the optical lens of the fourth embodiment is FOV, which satisfies the following condition: FOV = 84.98 degrees.

[0174] The seven optical lenses are optical lens L1, optical lens L2, optical lens L3, optical lens L4, optical lens L5, optical lens L6 and optical lens L7 from the object side to the image side. At least one of the seven optical lenses includes an anti-reflection coating. The optical lens including the anti-reflection coating is made of a plastic material. The anti-reflection coating is located on the object side surface or the image side surface of the optical lens. The anti-reflection coating includes at least one film layer. The material of the film layer located on the outside of the anti-reflection coating is metal oxide. The anti-reflection coating includes a plurality of holes, and the size of the holes adjacent to the outside of the anti-reflection coating is larger than the size of the holes adjacent to the inside of the anti-reflection coating. Each optical lens has an object side surface R1 and an image side surface R2.

[0175] The detailed parameters of the optical lenses included in the optical lens of the fourth embodiment are listed in Table 4 below, and the parameter definitions in Table 4 are the same as those in the first embodiment, which will not be repeated here.

[0176]

[0177]

[0178] <Fifth Embodiment>

[0179] The imaging device of the fifth embodiment includes an optical lens and an electronic photosensitive element. The optical lens includes eight optical lenses and an imaging surface from the object side to the image side, and the electronic photosensitive element is disposed on the imaging surface of the optical lens. The full viewing angle of the optical lens of the fifth embodiment is FOV, which satisfies the following condition: FOV = 85.11 degrees.

[0180] The eight optical lenses are optical lens L1, optical lens L2, optical lens L3, optical lens L4, optical lens L5, optical lens L6, optical lens L7 and optical lens L8 from the object side to the image side. At least one of the eight optical lenses includes an anti-reflection coating. The optical lens including the anti-reflection coating is made of a plastic material. The anti-reflection coating is located on the object side surface or the image side surface of the optical lens. The anti-reflection coating includes at least one film layer. The material of the film layer located on the outside of the anti-reflection coating is metal oxide. The anti-reflection coating includes a plurality of holes, and the size of the holes adjacent to the outside of the anti-reflection coating is larger than the size of the holes adjacent to the inside of the anti-reflection coating. Each optical lens has an object side surface R1 and an image side surface R2.

[0181] The detailed parameters of the optical lenses included in the optical lens of the fifth embodiment are listed in the following Table 5, and the parameter definitions in Table 5 are the same as those in the first embodiment, which will not be repeated here.

[0182]

[0183]

[0184]

[0185] <Sixth Embodiment>

[0186] The imaging device of the sixth embodiment includes an optical lens and an electronic photosensitive element. The optical lens includes nine optical lenses and an imaging surface from the object side to the image side, and the electronic photosensitive element is disposed on the imaging surface of the optical lens. The full viewing angle of the optical lens of the sixth embodiment is FOV, which satisfies the following condition: FOV = 86.76 degrees.

[0187] The nine optical lenses are optical lens L1, optical lens L2, optical lens L3, optical lens L4, optical lens L5, optical lens L6, optical lens L7, optical lens L8 and optical lens L9 from the object side to the image side. At least one of the nine optical lenses includes an anti-reflection coating. The optical lens including the anti-reflection coating is made of a plastic material. The anti-reflection coating is located on the object side surface or the image side surface of the optical lens. The anti-reflection coating includes at least one film layer. The material of the film layer located on the outermost side of the anti-reflection coating is metal oxide. The anti-reflection coating includes a plurality of holes, and the size of the hole adjacent to the outermost side of the anti-reflection coating is larger than the size of the hole adjacent to the innermost side of the anti-reflection coating. Each optical lens has an object side surface R1 and an image side surface R2.

[0188] The detailed parameters of the optical lenses included in the optical lens of the sixth embodiment are listed in Table 6 below, and the parameter definitions in Table 6 are the same as those in the first embodiment, which will not be repeated here.

[0189]

[0190]

[0191]

[0192] <Reflectivity measurement results at different wavelengths>

[0193] First, the following Table 7 lists the anti-reflection coating configurations of the comparative example and the first embodiment to the ninth embodiment.

[0194]

[0195]

[0196] It can be seen from Table 7 that the anti-reflection coating of the comparative example has six film layers in total, and the total film thickness is 246nm. In comparison, the anti-reflection coating of the first to ninth embodiments only has two film layers, and the total film thickness is only 215nm, which shows that the anti-reflection coating configuration method of the present disclosure can effectively improve the manufacturing efficiency and save costs.

[0197] The following will be measured for the comparative example, the aforementioned third embodiment, the fourth embodiment, the seventh embodiment, the eighth embodiment and the ninth embodiment to obtain their respective valley wavelengths, valley reflectivities and reflectivities at different wavelengths, and the results are listed in the following Tables 8 to 10.

[0198]

[0199]

[0200]

[0201]

[0202] Please refer to Figures 4 to 9 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9The relationship between the reflectivity and wavelength of the optical lens of the comparative example, the third embodiment, the fourth embodiment, the seventh embodiment, the eighth embodiment and the ninth embodiment is shown respectively. From the above measurement results, it can be seen that the anti-reflection effect of the optical lens of the comparative example will fluctuate with the change of wavelength, and the anti-reflection effect in the short wavelength region and the long wavelength region is not good. In contrast, the optical lens of the third embodiment, the fourth embodiment, the seventh embodiment, the eighth embodiment and the ninth embodiment can achieve a uniform anti-reflection effect at different wavelengths, proving that the optical lens of the present disclosure has the best anti-reflection effect in a wide wavelength range, which helps to improve the imaging quality.

[0203] Please refer to Fig. 10A and Fig. 10B , Fig. 10A and Fig. 10B These are the lens image quality test diagrams of the optical lens of the comparative example and the fourth embodiment under 40-degree incident strong light. Fig. 10A In the figure, it can be seen that unexpected light is generated in the upper right corner of the image, while Fig. 10B In the figure, the stray light in the upper right corner is significantly reduced, indicating that the optical lens of the present disclosure has an excellent effect of eliminating stray light in the corners.

[0204] Please refer to Fig.11 , Fig.11 is a cross-sectional view of an optical lens including an anti-reflection coating according to a fourth embodiment, Fig.11 It is obvious that the holes on the outer side of the anti-reflection coating are relatively larger than those on the inner side, which indicates that in the same plane, the irregular nanofiber structure on the outer side of the anti-reflection coating is sparsely distributed, while the irregular nanofiber structure on the inner side is densely distributed.

[0205] The present disclosure provides a multi-lens optical system, which uses a multi-layer coating design method and is designed with specific multiple anti-reflection coating factors to achieve an excellent wide-wavelength coating configuration equation. The sub-wavelength microstructure characteristics of the surface of the anti-reflection coating layer enable the high-quality optical system with multiple lenses to obtain the best wide-wavelength anti-reflection effect, while solving the problem of severe reflection of strong light at large angles that is difficult to overcome on optical lenses with drastic surface changes. It is particularly suitable for application to optical lenses with curved changes and materials with higher refractive indices, so that they can achieve uniform anti-reflection effects in the entire field of view and in a wide-wavelength range. When used in combination in a multi-lens optical system, it helps to significantly improve the imaging quality of high-end optical lenses.

[0206] Although the present disclosure has been disclosed as above by way of embodiments, it is not intended to limit the present disclosure. Anyone familiar with the art may make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the scope defined in the attached claims.

Claims

1. An optical lens, characterized in that: The optical lens includes from the object side to the image side: At least five optical lenses; Wherein, at least one of the optical lenses comprises an anti-reflection coating, the optical lens comprising the anti-reflection coating is a plastic lens, the anti-reflection coating is located on the object side surface or the image side surface of the optical lens, the anti-reflection coating comprises a plurality of holes, and the size of the holes adjacent to the outer side of the anti-reflection coating is larger than the size of the holes adjacent to the inner side of the anti-reflection coating, the anti-reflection coating comprises at least two film layers, the film layer located on the innermost side of the anti-reflection coating is a first film layer, the film layer connected to the first film layer is a second film layer, and the second film layer is an Al2O3 film layer; Wherein, the thickness of the optical lens on the optical axis is CT, the maximum value of the horizontal displacement between the intersection of the optical lens surface and the optical axis is SAGmax, the first factor of the anti-reflection coating configuration of the optical lens is Far1, Far1=|SAGmax| / CT, the average value of the tangent slope of the optical lens surface within the optical effective diameter range is SPavg, the minimum value of the tangent slope of the optical lens surface within the optical effective diameter range is SPmin, the second factor of the anti-reflection coating configuration of the optical lens is Far2, Far2=1 / (|SPavg|×|SPmin|), the refractive index of the optical lens material is Ns, the refractive index of the first film layer material is N1, and the ultra-wide wave domain factor of the optical lens when the anti-reflection coating is configured is Farw, Farw=100×((N1-Ns) / (N1+Ns)) 2 , the main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR = LOG (Far1 × Far2 × Farw), which satisfies the following conditions: -7.000≤FAR<0.

2. The optical lens according to claim 1, characterized in that: The main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR = LOG (Far1 × Far2 × Farw), which satisfies the following conditions: -5.000≤FAR<0.

3. The optical lens according to claim 2, characterized in that: The thickness of the optical lens on the optical axis is CT, the maximum horizontal displacement between the intersection of the optical lens surface and the optical axis is SAGmax, and the first factor of the anti-reflection coating configuration of the optical lens is Far1, Far1 = |SAGmax| / CT, which satisfies the following conditions: 1.000≤Far1≤10.

4. The optical lens according to claim 3, characterized in that: The average value of the tangent slope of the optical lens surface within the optical effective diameter range is SPavg, the minimum value of the tangent slope of the optical lens surface within the optical effective diameter range is SPmin, and the second factor of the anti-reflection coating configuration of the optical lens is Far2, Far2 = 1 / (|SPavg| × |SPmin|), which satisfies the following conditions: 0.100≤Far2≤0.

7.

5. The optical lens according to claim 1, characterized in that: The first film layer is a SiO2 film layer.

6. The optical lens according to claim 1, characterized in that: The refractive index of the optical lens material is Ns, the refractive index of the first film material is N1, and the ultra-wideband factor of the optical lens when the anti-reflection coating is configured is Farw, Farw = 100 × ((N1-Ns) / (N1+Ns)) 2 , which satisfies the following conditions: Farw≤0.

50.

7. The optical lens according to claim 1, characterized in that: The thickness of the first film layer is TL1, which satisfies the following conditions: 80nm≤TL1≤150nm.

8. The optical lens according to claim 7, characterized in that: The thickness of the second film layer is TL2, which satisfies the following conditions: 100nm≤TL2≤250nm.

9. The optical lens according to claim 1, characterized in that: The total film thickness of the anti-reflection coating is tTk, which satisfies the following conditions: 200nm≤tTk≤300nm.

10. The optical lens according to claim 1, characterized in that: The average reflectivity of the optical lens at a wavelength of 400nm-700nm is R4070, which meets the following conditions: 0.05％≤R4070≤1.5％。 11. The optical lens according to claim 10, characterized in that: The average reflectivity of the optical lens at a wavelength of 500nm-600nm is R5060, which meets the following conditions: 0.01％≤R5060≤1.0％。 12. The optical lens according to claim 1, characterized in that: The valley wavelength of the optical lens with the lowest reflectivity is Wtmin, which meets the following conditions: 500nm≤Wtmin≤730nm.

13. The optical lens according to claim 12, characterized in that: The optical lens has a valley point reflectivity of the lowest reflectivity, Rtmin, which satisfies the following conditions: 0.01%≤Rtmin≤0.50%.

14. An imaging device, characterized in that: Include: The optical lens as claimed in claim 1; and An electronic photosensitive element is arranged on an imaging surface of the optical lens.

15. An electronic device, being a mobile device, characterized in that: The electronic device comprises: The imaging device as claimed in claim 14.

Images