Optical lens, imaging device and electronic device

Abstract

The present disclosure provides an optical lens, an imaging device, and an electronic device. The optical lens comprises at least four optical lenses from the object side to the image side. At least one of the at least four 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 or the image side of the optical lens. The anti-reflection coating comprises at least one film layer, the film layer located outside the anti-reflection coating being a ceramic film layer. The anti-reflection coating comprises 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. This configuration allows the optical lens comprising multiple optical lenses to achieve optimal anti-reflection effects, significantly improving the imaging quality of the optical lens.

Description

Technical Field

[0001] 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

[0002] Conventional coating technologies (PVD and conventional CVD) can only produce usable anti-reflective coatings on flat surfaces. The demand for high-quality lenses in high-end mobile devices has significantly increased, and the number of lenses in these high-end optical lenses has correspondingly increased significantly. Due to the increased difficulty in optical system design and the need for more robust correction of aberrations in large off-axis fields of view, the surface profile of optical lenses near the imaging surface has significantly increased, creating a bottleneck that conventional coating technologies cannot overcome. Therefore, the development of highly uniform coating technologies for high-end multi-lens optical systems and optical lenses with drastic surface profile variations has become a trend. Summary of the Invention

[0003] The present disclosure is about developing an optical lens with multiple optical lenses, which uses atomic layer deposition (ALD) coating technology and is designed with specific multiple anti-reflective coating factors to obtain an excellent coating configuration. Through the characteristics of the sub-wavelength microstructure on the surface of the anti-reflective coating, the high-quality optical lens with multiple optical lenses can obtain the best anti-reflection effect, so as to solve the problem of severe reflection of strong light at large angles caused by optical lenses with drastic surface changes, and enable the curved optical lenses to achieve a uniform anti-reflective coating (AR Coating) production effect in the entire field of view. In this way, when the optical lens combination is applied to the optical lens of multiple optical lenses, it helps to significantly improve the imaging quality of high-end optical lenses.

[0004] According to the present disclosure, an optical lens includes at least four optical lenses from the object side to the image side. At least one of the at least four optical lenses includes an anti-reflection coating. The optical lens including the anti-reflection coating is a plastic lens. The anti-reflection coating is located on the object side or the image side of the optical lens. The anti-reflection coating includes at least one film layer, the film layer located outside the anti-reflection coating is a ceramic film layer. 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. The total thickness of the anti-reflection coating at the center of the optical lens is Tc, the total thickness of the anti-reflection coating at the periphery of the optical lens is Tp, the optical lens is a substrate, the thickness of the substrate on the optical axis is CTs, the maximum horizontal displacement between the intersection of the optical axis and the optical lens surface is SAGmax, the first factor of the anti-reflection coating configuration of the optical lens is Far1, Far1 = |SAGmax| / CTs, 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 substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2 The main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR = LOG (Far1 × Far2 × Far3), which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR≤10.

[0005] According to the aforementioned optical lens, the thickness of the substrate on the optical axis is CTs, 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| / CTs, which can meet the following conditions: 0.500≤Far1≤3.350.

[0006] According to the aforementioned optical lens, 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 can meet the following conditions: 0.100≤Far2≤0.914.

[0007] According to the aforementioned optical lens, the refractive index of the substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2, which can meet the following conditions: 2.5≤Far3≤3.6.

[0008] According to the aforementioned optical lens, the refractive index of the substrate is Ns, which can satisfy the following condition: Ns≤1.7682.

[0009] According to the aforementioned optical lens, the film layer located outside the anti-reflection coating can be an aluminum oxide (Al2O3) film layer.

[0010] According to the aforementioned optical lens, the anti-reflection coating may include at least three film layers, and the materials of the at least three film layers may be different.

[0011] According to the aforementioned optical lens, the wavelength at which the reflectivity valley point at the center of the optical lens has a relatively low reflectivity within a range is Wtc, and the wavelength at which the reflectivity valley point at the periphery of the optical lens has a relatively low reflectivity within a range is Wtp, which can satisfy the following conditions: 0nm≤|Wtc-Wtp|≤25nm.

[0012] According to the aforementioned optical lens, the reflectivity valley point at the center of the optical lens has a relatively low reflectivity Rtc within a range, which can meet the following conditions: 0% <Rtc≤0.300%。

[0013] According to the aforementioned optical lens, the reflectivity valley point at the periphery of the optical lens has a relatively low reflectivity Rtp within a range, which can meet the following conditions: 0% <Rtp≤0.300%。

[0014] According to the aforementioned optical lens, the wavelength at which the reflectivity peak point at the center of the optical lens has a relatively high reflectivity within a range is Wcc, and the wavelength at which the reflectivity peak point at the periphery of the optical lens has a relatively high reflectivity within a range is Wcp, which can meet the following conditions: 0nm≤|Wcc-Wcp|≤20nm.

[0015] According to the aforementioned optical lens, the reflectivity peak point at the center of the optical lens has a relatively high reflectivity Rcc within a range, which can meet the following conditions: 0.200%≤Rcc≤0.700%.

[0016] According to the aforementioned optical lens, the reflectivity peak point at the periphery of the optical lens has a relatively high reflectivity Rcp within a range, which can meet the following conditions: 0.200%≤Rcp≤0.700%.

[0017] According to the aforementioned optical lens, at least one surface of the optical lens including the anti-reflection coating may include at least one inflection point.

[0018] According to the aforementioned optical lens, the total number of layers of the anti-reflection coating is tLs, which can satisfy the following condition: 1≤tLs≤8.

[0019] According to the aforementioned optical lens, the total thickness of the anti-reflection coating is tTk, which can meet the following conditions: 200nm <tTk≤400nm。

[0020] According to the present disclosure, an imaging device is provided, comprising an optical lens, a diffractive element, and an electronic photosensitive element. The optical lens comprises at least four optical lenses from the object side to the image side, at least one of the at least four optical lenses comprising an anti-reflection coating. The optical lens comprising the anti-reflection coating is a plastic lens, the anti-reflection coating being located on either the object-side or image-side surface of the optical lens. The anti-reflection coating comprises at least one film layer, the film layer located outside the anti-reflection coating being a ceramic film layer. The anti-reflection coating comprises a plurality of holes, wherein the holes adjacent to the outside of the anti-reflection coating are larger than the holes adjacent to the inside of the anti-reflection coating. The total thickness of the anti-reflection coating at the center of the optical lens is Tc, the total thickness of the anti-reflection coating at the periphery of the optical lens is Tp, the optical lens is a substrate, the thickness of the substrate on the optical axis is CTs, the maximum horizontal displacement between the intersection of the optical axis and the optical lens surface is SAGmax, the first factor of the anti-reflection coating configuration of the optical lens is Far1, Far1 = |SAGmax| / CTs, 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 substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2 The main factor for configuring the anti-reflection coating of an optical lens is FAR, where FAR = LOG(Far1 × Far2 × Far3), satisfying the following conditions: |Tc - Tp| / Tc ≤ 5.00%; and -1.5 ≤ FAR ≤ 10. At least one surface of the diffractive element includes an anti-reflection coating, which is an aluminum oxide coating. The electronic photosensitive element is disposed on an imaging surface of the optical lens.

[0021] According to the present disclosure, an imaging device is provided, comprising an optical lens, a curved surface element, and an electronic photosensitive element. The optical lens comprises at least four optical lenses from the object side to the image side, at least one of the at least four optical lenses comprising an anti-reflection coating. The optical lens comprising the anti-reflection coating is a plastic lens, the anti-reflection coating being located on either the object side or the image side of the optical lens. The anti-reflection coating comprises at least one film layer, the film layer located outside the anti-reflection coating being a ceramic film layer. The anti-reflection coating comprises a plurality of holes, wherein the holes adjacent to the outside of the anti-reflection coating are larger than the holes adjacent to the inside of the anti-reflection coating. The total thickness of the anti-reflection coating at the center of the optical lens is Tc, the total thickness of the anti-reflection coating at the periphery of the optical lens is Tp, the optical lens is a substrate, the thickness of the substrate on the optical axis is CTs, the maximum horizontal displacement between the intersection of the optical axis and the optical lens surface is SAGmax, the first factor of the anti-reflection coating configuration of the optical lens is Far1, Far1 = |SAGmax| / CTs, 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 substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2 The main factor for anti-reflection coating configuration of an optical lens is FAR, where FAR = LOG(Far1 × Far2 × Far3), which satisfies the following conditions: |Tc - Tp| / Tc ≤ 5.00%; and -1.5 ≤ FAR ≤ 10. At least one surface of the curved element includes a phase sub-wavelength structure, and the electronic photosensitive element is disposed on an imaging surface of the optical lens.

[0022] According to the present disclosure, an electronic device is provided, which is a mobile device, and includes the imaging device as described in the preceding paragraph.

[0023] When |Tc-Tp| / Tc satisfies the above conditions, a uniform anti-reflection coating effect can be achieved on an optical lens with varying curvature.

[0024] When FAR meets the above conditions, an excellent coating configuration can be obtained.

[0025] An optical lens provided according to the present disclosure includes at least one optical lens and at least one anti-reflection element from the object side to the image side. At least one surface of the at least one anti-reflection element includes an anti-reflection coating. The anti-reflection element with the anti-reflection coating is a glass element. The anti-reflection coating includes at least two film layers. One of the film layers closest to the substrate of the anti-reflection element is a first film layer, and the refractive index of the first film layer is less than that of the substrate. The film layer outside the anti-reflection coating is an alumina film layer. The anti-reflection coating includes multiple holes. 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, and the outermost film layer has a gradually changing refractive index. The total film thickness of the anti-reflection coating is tTk, the thickness of the substrate on the optical axis is CTs, the maximum value of the horizontal displacement between the intersection points of the optical lens surface and the optical axis is SAGmax, the first factor configured for the anti-reflection coating of the optical lens is Far1, Far1 = |SAGmax| / CTs, 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 configured for the anti-reflection coating of the optical lens is Far2, Far2 = 1 / (|SPavg| × |SPmin|), the refractive index of the substrate is Ns, and the third factor configured for the anti-reflection coating of the optical lens is Far3, Far3 = (1 / (Ns - 1)) 2 The main factor configured for the anti-reflection coating of the optical lens is FAR, FAR = LOG(Far1 × Far2 × Far3), and it satisfies the following conditions: 200 nm < tTk ≤ 400 nm; and -1.5 ≤ FAR ≤ 10.

[0026] When tTk satisfies the above conditions, the best low-reflection effect can be effectively maintained.

[0027] According to the optical lens described above, the substrate can be a flat element.

[0028] According to the optical lens described above, the thickness of the substrate on the optical axis is CTs, and it can satisfy the following conditions: 0.15 mm < CTs ≤ 0.60 mm.

[0029] According to the optical lens described above, the refractive index of the substrate is Ns, and the third factor configured for the anti-reflection coating of the optical lens is Far3, Far3 = (1 / (Ns - 1)) 2 and it can satisfy the following conditions: 1.0 ≤ Far3 ≤ 5.0.

[0030] According to the optical lens described above, the average reflectance of the substrate at wavelengths of 400 nm - 630 nm is R4063, and it can satisfy the following conditions: 0% ≤ R4063 ≤ 1.3%.

[0031] According to the aforementioned optical lens, the average reflectivity of the substrate at a wavelength of 670 nm-1000 nm is R67100, which can meet the following condition: 0%≤R67100≤3.0%.

[0032] According to the aforementioned optical lens, the average transmittance of the substrate at a wavelength of 400 nm-600 nm is T4060, which can meet the following condition: 95%≤T4060≤100%.

[0033] According to the aforementioned optical lens, the anti-reflection coating can have a second film layer, the refractive index of the second film layer can be greater than the refractive index of the first film layer, the refractive index of the second film layer can be greater than the refractive index of the substrate, and the refractive index of the outermost film layer can be equivalently less than the refractive index of the first film layer and the substrate.

[0034] According to the aforementioned optical lens, the substrate may be a microlens. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] To make the above and other objects, features, advantages and embodiments of the present disclosure more apparent, the accompanying drawings are described as follows:

[0036] Figure 1 is a graph showing the relationship between the reflectivity and wavelength of an optical lens according to the first embodiment;

[0037] Figure 2 is a graph showing the relationship between the reflectivity and wavelength of an optical lens according to the second embodiment;

[0038] Figure 3 is a graph showing the relationship between the reflectivity and wavelength of an optical lens according to the third embodiment;

[0039] Figure 4 is a graph showing the relationship between the reflectivity and wavelength of an optical lens according to the sixth embodiment;

[0040] Figure 5 is a graph showing the relationship between the reflectivity and wavelength of an optical lens according to the seventh embodiment;

[0041] Figure 6 is a graph showing the relationship between the reflectivity and wavelength of an optical lens of the first comparative example;

[0042] Figure 7A This is a test chart of the image quality of the optical lens of the first comparative example under strong light with an incident angle of 55 degrees;

[0043] Figure 7B This is a test chart of the image quality of the optical lens of the second embodiment under strong light with an incident angle of 55 degrees;

[0044] Figure 8A is a cross-sectional view at the center of an optical lens including an anti-reflective coating according to a seventh embodiment;

[0045] Figure 8B is a cross-sectional view of the periphery of an optical lens including an anti-reflective coating according to a seventh embodiment;

[0046] Figure 9A This is a test chart of the image quality of the optical lens of the first comparative example under strong light with a large incident angle;

[0047] Figure 9B This is a test chart of the image quality of the optical lens of the thirteenth embodiment under strong light with large incident angles;

[0048] Figure 10A This is a test chart of the image quality of the microlens of the first comparative example;

[0049] Figure 10B This is a lens image quality test chart of the microlens of the thirteenth embodiment;

[0050] Figure 11 is a graph showing the relationship between the reflectivity and wavelength of the anti-reflection element of the second comparative example;

[0051] Figure 12 is a graph showing the relationship between the reflectivity and wavelength of the anti-reflection element of the fourteenth embodiment;

[0052] Figure 13 is a graph showing the relationship between the reflectivity and wavelength of the anti-reflection element of the fifteenth embodiment;

[0053] Figure 14 is a graph showing the relationship between transmittance and wavelength of the anti-reflection element of the second comparative example;

[0054] Figure 15 is a graph showing the relationship between transmittance and wavelength of the anti-reflection element of the fourteenth embodiment;

[0055] Figure 16 A schematic diagram of an imaging device according to an embodiment of the present disclosure;

[0056] Figure 17A for Figure 16 The partially enlarged schematic diagram of the imaging device at position 17A is shown;

[0057] Figure 17B for Figure 16 A partial enlarged schematic diagram of the imaging device at position 17B is shown;

[0058] Figure 17C for Figure 16 The imaging device shown and Figure 18 A partial enlarged schematic diagram of the diffraction element at position 17C is shown;

[0059] Figure 17D for Figure 16A partially enlarged schematic diagram of the imaging device at position 17D is shown; and

[0060] Figure 18 is a schematic diagram of a diffraction element in an imaging device.

[0061]

Explanation of symbols

[0062] 110: Curved surface component

[0063] 111, 121, 161: Object side surface

[0064] 120: Optical lens

[0065] 122: Image side surface

[0066] 130: Phase sub-wavelength structure

[0067] 140: Imaging surface

[0068] 150: Electronic photosensitive element

[0069] 160: Diffraction element

[0070] T1, T2, T3: valley points

[0071] C1, C2: Peak points DETAILED DESCRIPTION

[0072] The present disclosure provides an optical lens comprising at least four optical lenses from the object side to the image side. At least one of the at least four optical lenses comprises an anti-reflection coating. The optical lens comprising the anti-reflection coating is made of a plastic material. The anti-reflection coating is located on the object side or the image side of the optical lens. The anti-reflection coating comprises at least one film layer, the film layer located outside the anti-reflection coating being made of ceramic. The anti-reflection coating comprises a plurality of holes, and the size of the holes adjacent to the outside of the anti-reflection coating is greater than the size of the holes adjacent to the inside of the anti-reflection coating. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0073] This disclosure relates to the development of an optical lens with multiple optical elements. This lens utilizes atomic layer deposition coating technology and is designed with specific multiple anti-reflection coating factors to achieve an excellent coating configuration. By utilizing the sub-wavelength structure of the anti-reflection coating surface, high-quality optical lenses with multiple optical elements can achieve optimal anti-reflection effects. This addresses the severe reflection of strong light at large angles caused by optical lenses with drastically varying surface shapes, and enables curved optical lenses to achieve a uniform anti-reflection coating across the entire field of view. Consequently, when optical lens combinations are applied to optical lenses with multiple optical elements, the imaging quality of high-end optical lenses can be significantly improved.

[0074] The total thickness of the anti-reflective coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflective coating located at the periphery of the optical lens is Tp, which can meet the following conditions: |Tc-Tp| / Tc≤10.00%; |Tc-Tp| / Tc≤3.00%; |Tc-Tp| / Tc≤1.50%; or 0%<|Tc-Tp| / Tc≤0.50%.

[0075] 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 third factor of the anti-reflection coating configuration of the optical lens is Far3, and the main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR=LOG(Far1×Far2×Far3), which can meet the following conditions: -1.0≤FAR; -0.75≤FAR; -0.50≤FAR; -0.30≤FAR≤1; or 0.1≤FAR≤10.

[0076] This disclosure relates to the development of an optical lens with multiple optical elements. This lens utilizes atomic layer deposition coating technology and is designed with specific multiple anti-reflection coating factors to achieve an excellent coating configuration. By utilizing the sub-wavelength structure characteristics of the anti-reflection coating surface, high-quality optical lenses with multiple optical elements can achieve optimal anti-reflection effects. This addresses the severe reflection of strong light at large angles caused by optical lenses with drastically varying surface shapes, and enables curved optical lenses to achieve a uniform anti-reflection coating across the entire field of view. Consequently, the application of optical lens combinations in a multi-optical lens significantly improves the imaging quality of high-end optical lenses.

[0077] The optical lens may be a substrate having a thickness on the optical axis of CTs. 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, where Far1 = |SAGmax| / CTs. This factor may satisfy the following condition: 0.500 ≤ Far1. By controlling the relationship factor between the thickness of the optical lens and the off-axis horizontal displacement in the optical lens, an optimal coating configuration for the optical lens may be effectively obtained. Furthermore, the following conditions may be satisfied: 1.000 ≤ Far1; 1.500 ≤ Far1; 1.700 ≤ Far1; or 2.000 ≤ Far1.

[0078] The average value of the tangent slope of the optical lens surface within the optical effective diameter is SPavg, and the minimum value of the tangent slope of the optical lens surface within the optical effective diameter is SPmin. The second factor of the anti-reflection coating configuration of the optical lens is Far2, Far2 = 1 / (|SPavg| × |SPmin|), which can meet the following conditions: 0.100 ≤ Far2. By controlling the off-axis surface variation factor of the optical lens in the optical lens, the optimal coating configuration of the optical lens is effectively obtained, and the application value of the anti-reflection coating is improved. Furthermore, the following conditions can be met: 0.200 ≤ Far2; 0.300 ≤ Far2; 0.400 ≤ Far2; or 0.500 ≤ Far2.

[0079] The refractive index of the substrate is Ns. The third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2 , which can meet the following conditions: 2.5 ≤ Far3. By controlling the difference factor between the refractive index of the optical lens and the refractive index of air, the anti-reflection coating is placed on the most appropriate optical lens surface in the optical lens. This allows light to pass through the anti-reflection coating layer in a gradient refractive index from the air side before entering the optical lens, thereby achieving the optimal anti-reflection effect and the desired anti-reflection effect. Furthermore, the following conditions can be met: 2.9 ≤ Far3; 3.0 ≤ Far3; 3.1 ≤ Far3; 3.3 ≤ Far3; or 3.5 ≤ Far3.

[0080] The substrate's refractive index, Ns, can meet the following conditions: Ns ≤ 1.7682. By applying coating technology to a low-refractive-index material closer to the refractive index of air, the anti-reflection coating's anti-reflection effect is effectively enhanced, and the reflectivity reduction effect is intensified. Furthermore, the following conditions can be met: Ns ≤ 1.700; or Ns ≤ 1.600.

[0081] The material of the film layer located inside the anti-reflection coating can be alumina (Al2O3). Through the appropriate configuration of the optical lens material and the anti-reflection coating film layer material in contact with the optical lens, better coating adhesion and protection of the optical lens surface can be obtained, avoiding the peeling off due to insufficient adsorption force of the anti-reflection coating, and avoiding surface defects of the optical lens caused during the coating production process, which helps to improve the passing rate of the optical lens in the environmental weather resistance test.

[0082] The anti-reflection coating can include at least three film layers, and the materials of the film layers can be different. By having an anti-scratch and wear-resistant protective film layer or a protective film layer for protecting the optical lens, the anti-reflection coating can be prevented from being damaged and chemically eroded.

[0083] The wavelength with a relatively low reflectivity within a range (±25 nm) at the reflectivity trough point at the center of the optical lens is Wtc, and the wavelength with a relatively low reflectivity within a range (±25 nm) at the reflectivity trough point at the periphery of the optical lens is Wtp, which can satisfy the following conditions: 0 nm ≤ |Wtc - Wtp| ≤ 25 nm. By controlling the reflectivity offset within a specific wavelength range at the reflectivity trough point, a consistent anti-reflection effect within the effective diameter of the optical lens can be maintained. Furthermore, the following conditions can be satisfied: 0 nm < |Wtc - Wtp| ≤ 15 nm; or 1 nm ≤ |Wtc - Wtp| ≤ 10 nm.

[0084] The relatively low reflectivity within a range (±25 nm) at the reflectivity trough point at the center of the optical lens is Rtc, which can satisfy the following conditions: 0% < Rtc ≤ 0.300%. By reducing the reflectivity at the reflectivity trough point at the center of the optical lens, it helps to improve the best anti-reflection effect of the anti-reflection coating within a specific wavelength range. Furthermore, the following conditions can be satisfied: Rtc ≤ 0.200%; or Rtc ≤ 0.100%.

[0085] The relatively low reflectivity within a range (±25 nm) at the reflectivity trough point at the periphery of the optical lens is Rtp, which can satisfy the following conditions: 0% < Rtp ≤ 0.300%. By reducing the reflectivity at the reflectivity trough point at the periphery of the optical lens, it helps to improve the best anti-reflection effect of the anti-reflection coating within a specific wavelength range. Furthermore, the following conditions can be satisfied: Rtp ≤ 0.200%; or Rtp ≤ 0.100%.

[0086] The wavelength with relatively high reflectivity within a range (±25nm) at the reflectivity peak at the center of the optical lens is Wcc, and the wavelength with relatively high reflectivity within a range (±25nm) at the reflectivity peak at the periphery of the optical lens is Wcp. They can meet the following conditions: 0nm≤|Wcc-Wcp|≤20nm. By controlling the reflectivity offset within a specific wavelength range at the reflectivity peak, a consistent anti-reflection effect can be maintained within the effective diameter of the optical lens. Furthermore, the following conditions can be met: 0nm≤|Wcc-Wcp|≤25nm; 0nm<|Wcc-Wcp|≤15nm; or 1nm≤|Wcc-Wcp|≤10nm.

[0087] The relatively high reflectivity Rcc at the reflectivity peak at the center of the optical lens within a range (±25nm) can meet the following conditions: 0.200% ≤ Rcc ≤ 0.700%. By reducing the reflectivity of the reflectivity peak at the center of the optical lens, it helps to improve the optimal anti-reflection effect of the anti-reflection coating within a specific wavelength range. Furthermore, the following conditions can be met: 0.300% ≤ Rcc ≤ 0.600%; or 0.400% ≤ Rcc ≤ 0.500%.

[0088] The relatively high reflectivity Rcp at the reflectivity peak point at the periphery of the optical lens within a range (±25nm) can meet the following conditions: 0.200% ≤ Rcp ≤ 0.700%. By reducing the reflectivity of the reflectivity peak point at the periphery of the optical lens, it helps to improve the optimal anti-reflection effect of the anti-reflection coating within a specific wavelength range. Furthermore, the following conditions can be met: 0.300% ≤ Rcp ≤ 0.600%; or 0.400% ≤ Rcp ≤ 0.500%.

[0089] At least one surface of an optical lens including an anti-reflection coating may include at least one inflection point. The design of the inflection point on the surface of the optical lens helps to maximize the cost-effectiveness of atomic layer deposition coating, and can achieve a uniform coating effect on the surface of the optical lens with drastic changes in surface shape, thereby avoiding the defect of excessively strong reflected light around the optical lens caused by the reflectivity being offset due to the difference in film thickness of the anti-reflection coating.

[0090] The total number of layers of the anti-reflection coating is tLs, which can meet the following conditions: 1≤tLs≤8. By controlling the number of film layers of the anti-reflection coating, the production efficiency can be effectively improved and the cost can be saved.

[0091] The total film thickness of the anti-reflection coating is tTk, which can satisfy the following conditions: 200 nm < tTk ≤ 400 nm. By controlling the total thickness of the anti-reflection coating, the optimal low-reflection effect can be effectively maintained. Furthermore, the following conditions can be satisfied: 150 nm ≤ tTk ≤ 800 nm; 200 nm ≤ tTk ≤ 600 nm; 230 nm ≤ tTk ≤ 500 nm; or 240 nm ≤ tTk ≤ 400 nm.

[0092] The full viewing angle of the optical lens is FOV, which can satisfy the following conditions: 60 degrees ≤ FOV ≤ 220 degrees; or 70 degrees ≤ FOV ≤ 100 degrees. Thus, the anti-reflection coating can be applied to optical lenses with different scene requirements according to the visual needs to achieve the required anti-reflection effect.

[0093] The total thickness of the anti-reflection coating at the center of the optical lens is Tc, which can satisfy the following conditions: 150 nm ≤ Tc ≤ 800 nm; 200 nm ≤ Tc ≤ 600 nm; 230 nm ≤ Tc ≤ 500 nm; or 240 nm ≤ Tc ≤ 400 nm.

[0094] The total thickness of the anti-reflection coating at the periphery of the optical lens is Tp, which can satisfy the following conditions: 150 nm ≤ Tp ≤ 800 nm; 200 nm ≤ Tp ≤ 600 nm; 230 nm ≤ Tp ≤ 500 nm; or 240 nm ≤ Tp ≤ 400 nm.

[0095] The present disclosure further provides an optical lens, which includes at least one optical lens and at least one anti-reflection element from the object side to the image side. At least one surface of the at least one anti-reflection element includes an anti-reflection coating. The anti-reflection element including the anti-reflection coating is made of a glass material. The anti-reflection coating includes at least two film layers. One of the film layers closest to the substrate of the anti-reflection element is a first film layer, and the refractive index of the first film layer is less than that of the substrate. The main material of the film layer outside the anti-reflection coating is alumina. The anti-reflection coating includes a plurality of holes. 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, and the outermost film layer has a gradually changing refractive index. The total film thickness of the anti-reflection coating is tTk, which satisfies the following conditions: 200 nm < tTk ≤ 400 nm.

[0096] The present disclosure is to develop an optical lens, which can apply coating technology and design with specific anti-reflection coating factors. Through the characteristics of the sub-wavelength structure on the surface of the anti-reflection coating, the optical lens with an anti-reflection element can obtain the best anti-reflection effect, solve the problem of severe reflection of strong light at large angles, and achieve a uniform anti-reflection coating production effect.

[0097] The substrate can be a flat element, and the thickness of the substrate on the optical axis is CTs, which can meet the following conditions: 0.15 mm < CTs ≤ 0.60 mm, and the finished product yield is improved by controlling appropriate substrate characteristics. Furthermore, the following conditions can be met: 0.15 mm ≤ CTs ≤ 2.00 mm; CTs ≤ 1.50 mm; CTs ≤ 1.00 mm; CTs ≤ 0.60 mm; CTs ≤ 0.45 mm; or CTs ≤ 0.35 mm.

[0098] The third factor of the anti-reflection coating of the optical lens is Far3, which can meet the following conditions: 1.0 ≤ Far3 ≤ 5.0. By controlling the difference factor between the refractive index of the substrate and the refractive index of air, the light can enter from the air side with a gradually changing refractive index to achieve the best anti-reflection effect and the required anti-reflection effect. Furthermore, the following conditions can be met: 1.4 ≤ Far3 ≤ 4.0; or 1.6 ≤ Far3 ≤ 3.6.

[0099] The average reflectance of the substrate at wavelengths of 400 nm - 630 nm is R4063, which can meet the following conditions: 0% ≤ R4063 ≤ 1.3%, and the required anti-reflection effect is achieved by controlling the reflectance performance. Furthermore, the following conditions can be met: R4063 ≤ 1.0%; R4063 ≤ 0.7%; or R4063 ≤ 0.5%.

[0100] The average reflectance of the substrate at wavelengths of 670 nm - 1000 nm is R67100, which can meet the following conditions: 0% ≤ R67100 ≤ 3.0%, and the required anti-reflection effect is achieved by controlling the reflectance performance. Furthermore, the following conditions can be met: R67100 ≤ 2.5%; R67100 ≤ 2.0%; or R67100 ≤ 1.5%.

[0101] The average transmittance of the substrate at wavelengths of 400 nm - 600 nm is T4060, which can meet the following conditions: 95% ≤ T4060 ≤ 100%, and the required light transmission effect is achieved by controlling the transmittance performance. Furthermore, the following conditions can be met: 97% ≤ T4060; or 99% ≤ T4060.

[0102] The anti-reflection coating can have a second film layer. The refractive index of the second film layer can be greater than the refractive index of the first film layer, the refractive index of the second film layer can be greater than the refractive index of the substrate, and the refractive index of the outermost film layer is equivalently less than the refractive indices of the first film layer and the substrate, thereby effectively improving the anti-reflection effect.

[0103] The substrate can be a microlens, which helps to improve lobe-shaped stray light.

[0104] The refractive index of the substrate is Ns, which may satisfy the following conditions: 1.40≤Ns≤2.00; 1.45≤Ns≤1.90; 1.50≤Ns≤1.80; or 1.50≤Ns≤1.75.

[0105] The wavelength at which the substrate has a minimum reflectivity within the wavelength range of 400 nm to 1000 nm is WRmin, which may satisfy the following conditions: 550 nm ≤ WRmin ≤ 600 nm; 560 nm ≤ WRmin ≤ 595 nm; or 570 nm ≤ WRmin.

[0106] The average reflectivity of the substrate at a wavelength of 400 nm to 600 nm is R4060, which may satisfy the following conditions: 0%≤R4060≤1.3%; R4060≤1.0%; R4060≤0.7%; or R4060≤0.5%.

[0107] The average reflectivity of the substrate at a wavelength of 400 nm to 650 nm is R4065, which may satisfy the following conditions: 0%≤R4065≤1.3%; R4065≤1.0%; R4065≤0.7%; or R4065≤0.5%.

[0108] The average reflectivity of the substrate at a wavelength of 400 nm-1000 nm is R40100, which may satisfy the following conditions: 0%≤R40100≤2.5%; R40100≤2.0%; R40100≤1.5%; or R40100≤1.0%.

[0109] The average reflectivity of the substrate at a wavelength of 500 nm-600 nm is R5060, which may satisfy the following conditions: 0%≤R5060≤1.3%; R5060≤1.0%; R5060≤0.7%; or R5060≤0.5%.

[0110] The average reflectivity of the substrate at a wavelength of 600 nm-700 nm is R6070, which may satisfy the following conditions: 0%≤R6070≤2.5%; R6070≤2.0%; R6070≤1.5%; or R6070≤1.0%.

[0111] The average reflectivity of the substrate at a wavelength of 700 nm-1000 nm is R70100, which may satisfy the following conditions: 0%≤R70100≤3.0%; R70100≤2.5%; R70100≤2.0%; or R70100≤1.5%.

[0112] The average reflectivity of the substrate at wavelengths from 800 nm to 1000 nm is R80100, which can meet the following conditions: 0% ≤ R80100 ≤ 3.0%; R80100 ≤ 2.5%; R80100 ≤ 2.0%; or R80100 ≤ 1.5%.

[0113] The average reflectivity of the substrate at wavelengths from 900 nm to 1000 nm is R90100, which can meet the following conditions: 0% ≤ R90100 ≤ 3.0%; R90100 ≤ 2.5%; R90100 ≤ 2.0%; or R90100 ≤ 1.5%.

[0114] The reflectivity of the substrate at a wavelength of 500 nm is R50, which can meet the following conditions: 0% ≤ R50 ≤ 1.3%; R50 ≤ 1.0%; R50 ≤ 0.7%; or R50 ≤ 0.5%.

[0115] The reflectivity of the substrate at a wavelength of 600 nm is R60, which can meet the following conditions: 0% ≤ R60 ≤ 1.3%; R60 ≤ 1.0%; R60 ≤ 0.7%; or R60 ≤ 0.5%.

[0116] The reflectivity of the substrate at a wavelength of 650 nm is R65, which can meet the following conditions: 0% ≤ R65 ≤ 1.3%; R65 ≤ 1.0%; R65 ≤ 0.7%; or R65 ≤ 0.5%.

[0117] The reflectivity of the substrate at a wavelength of 700 nm is R70, which can meet the following conditions: 0% ≤ R70 ≤ 2.5%; R70 ≤ 2.0%; R70 ≤ 1.5%; or R70 ≤ 1.0%.

[0118] The reflectivity of the substrate at a wavelength of 800 nm is R80, which can meet the following conditions: 0% ≤ R80 ≤ 3.0%; R80 ≤ 2.5%; R80 ≤ 2.0%; or R80 ≤ 1.5%.

[0119] The reflectivity of the substrate at a wavelength of 900 nm is R90, which can meet the following conditions: 0% ≤ R90 ≤ 3.0%; R90 ≤ 2.5%; R90 ≤ 2.0%; or R90 ≤ 1.5%.

[0120] The reflectivity of the substrate at a wavelength of 1000 nm is R100, which can meet the following conditions: 0% ≤ R100 ≤ 3.0%; R100 ≤ 2.5%; R100 ≤ 2.0%; or R100 ≤ 1.5%.

[0121] The wavelength at which the substrate has the maximum transmittance within the wavelength range from 400 nm to 1000 nm is Tmax, which can meet the following conditions: 98% < Tmax ≤ 100%; or 99% ≤ Tmax.

[0122] The average transmittance of the substrate at wavelengths from 500 nm to 600 nm is T5060, which can meet the following conditions: 98% < T5060 ≤ 100%; or 99% ≤ T5060.

[0123] The transmittance of the substrate at a wavelength of 400 nm is T40, which can meet the following conditions: 85% ≤ T40 ≤ 100%; 90% ≤ T40; or 92% ≤ T40.

[0124] The transmittance of the substrate at a wavelength of 500 nm is T50, which can meet the following conditions: 98% < T50 ≤ 100%.

[0125] The transmittance of the substrate at a wavelength of 600 nm is T60, which can meet the following conditions: 98% < T60 ≤ 100%.

[0126] The transmittance of the substrate at a wavelength of 700 nm is T70, which can meet the following conditions: T70 ≤ 0.2%; or T70 ≤ 0.15%.

[0127] The excellent-quality optical lens provided by the present disclosure must be comprehensively evaluated through parameters such as the antireflection coating factor and then the best design is made. An antireflection coating is made on the surface of a specific plastic optical lens, so that the antireflection coating has excellent uniformity, high environmental weather resistance, the best antireflection effect and good imaging quality.

[0128] Preferably, both surfaces of the optical lens have antireflection coatings, but an antireflection coating can also be made only on an appropriate surface. By applying the technology of the present disclosure to the surface with a drastic change in the optical lens surface profile, the antireflection coating made by the atomic layer deposition method has the best value, achieving a balance between cost and quality. Making an antireflection coating on an optical lens with the most appropriate refractive index can achieve the best antireflection effect.

[0129] The reflectance of the present disclosure is measured with a single optical lens or substrate, and the reflectance data at an incident angle of 0 degrees are used as the comparison benchmark.

[0130] The surface pore formation process can effectively improve the distribution of holes on the surface of an optical lens, increasing the spacing between holes on the surface of the optical lens, presenting a sponge-like pore structure, or changing the density of the pores. The pore formation effect can also change with the depth of the anti-reflective coating. For example, the outer side of the anti-reflective coating exposed to air has a larger pore structure, while the inner side has a relatively smaller pore structure. It can be clearly seen that the holes / gaps distributed on the outer side are relatively larger than the holes on the inner side. This can also be explained by the fact that the distribution density of the irregular branched structure on the outer side is sparser under the same plane, while the distribution density of the irregular branched structure on the inner side is denser under the same plane. 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, and can make the outermost film layer have a gradient refractive index. The outer side and inner side of the anti-reflective coating refer to the side exposed to air in the cross-sectional view and schematic diagram, where the outer side is the side exposed to air and the inner side is the side closer to the optical lens or substrate. The surface pore formation process can be achieved by using plasma etching, chemical reaction etching, controlling the crystal grain size by time, or using high-temperature solution treatment, such as immersion in alcohol or water at a temperature above 50 degrees.

[0131] The outer layer of the anti-reflective coating disclosed herein can be made of metal oxides, metal nitrides, metal fluorides, non-metallic oxides, non-metallic nitrides, non-metallic fluorides, or ceramics. Ceramic materials primarily include oxides, nitrides, borides, and carbides, such as aluminum oxide. When the outer layer of the anti-reflective coating is made of SiO2, Nb2O5, Pa2O5, or MgF2, it can be fabricated using physical vapor deposition (PVD), dry etching with argon (Ar) ions, or wet etching with a phosphoric acid solution. This can also produce nanofiber structures of varying shapes, including columns, strips, cones, towers, petals, or irregular shapes. The thickness of the nanofiber structure is approximately 100 nm to 300 nm, and the diameter of the nanofibers is approximately 10 nm to 100 nm.

[0132] The refractive index of the high-refractive-index material of the anti-reflection coating at a wavelength of 587.6 nm is Nh, and the refractive index of the low-refractive-index material of the anti-reflection coating at a wavelength of 587.6 nm is Nl. The refractive index of the high-refractive-index material of the anti-reflection coating may be greater than 2.0, and the refractive index of the low-refractive-index material of the anti-reflection coating may be less than 1.8. For example, the anti-reflection coating material (refractive index at a wavelength of 587.6 nm) may be: MgF2 (1.3777), SiO2 (1.4585), Al2O3 (1.7682), HfO2 (1.8935), ZnO (1.9269), Sc2O3 (1.9872), AlN (2.0294), Si3N4 (2.0381), Ta2O5 (2.1306), ZrO2 (2.1588), ZnS (2.2719), Nb2O5 (2.3403), TiO2 (2.6142), or TiN (3.1307).

[0133] The first layer of coating material close to the surface of the plastic optical lens can be TiO2, AlN, Al2O3, aluminum hydroxide (Al(OH)3) or an aluminum-containing mixture. It can enhance the adhesion between the anti-reflective coating and the optical lens, prevent the anti-reflective coating from falling off, achieve the effect of protecting the surface of the optical lens, and effectively enhance the environmental weather resistance of the optical lens.

[0134] Anti-reflection coatings are based on the principle of destructive interference. Single or multi-layer thin films can be deposited on the surface of plastic optical lenses using physical vapor deposition (PVD), such as evaporation deposition or sputtering deposition, or chemical vapor deposition (CVD), such as ultra-high vacuum chemical vapor deposition, microwave plasma-assisted chemical vapor deposition, plasma-enhanced chemical vapor deposition, or atomic layer deposition.

[0135] The full field of view disclosed herein is the range from the center 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 optical lens surface.

[0136] The tangent slope of the optical lens surface is calculated when the optical axis is horizontal. The tangent slope is infinite (Infinity, INF, ∞) near the optical axis.

[0137] The optical lens may also include a diffraction element (Fresnel lens), a flat element such as an IR-cut filter, blue glass, a short-wavelength absorption element, a long-wavelength absorption element, or cover glass, a microlens disposed on the surface of the sensor or imaging surface, or a light-guiding element such as a reflector, prism, or fly-eye integrator. At least one surface of the anti-reflection element may have an anti-reflection coating. The primary materials of the different layers of the anti-reflection coating may be aluminum oxide, silicon oxide, or titanium oxide.

[0138] The optical lens may also include a planar element or a curved element, disposed within or outside the optical lens group. The surface of the planar element or curved element may have a phase subwavelength structure (MetaLens). The phase subwavelength structure may include a film layer composed of a metal oxide (such as TiO2, Al2O3), a metal nitride (such as AlN), a silicon oxide (such as SiO2), or a silicon nitride (such as SiN). A graphene film layer may be configured on the surface of the optical lens in the optical lens to achieve the same effect as the phase subwavelength structure.

[0139] Plastic optical lenses can experience significant surface shape variations due to thickness and high temperatures. The greater the number of anti-reflection coating layers, the more pronounced the temperature effect on surface accuracy. Lens correction technology effectively addresses the temperature effect of coatings on plastic optical lenses, helping to maintain the coating integrity and high precision of the plastic lens. This is a key technology for achieving high-quality imaging lenses.

[0140] Lens correction techniques can utilize moldflow analysis, curve fitting, or wavefront error methods, but are not limited to these. The moldflow analysis method uses moldflow analysis to identify the three-dimensional contour nodes of the optical lens surface where the lens shrinks along the Z-axis. This is converted into an aspheric curve and then compared with the original curve. The correction value is calculated by taking into account the material shrinkage rate and surface deformation trend of the optical lens. The curve fitting method measures the contour error of the optical lens surface, fits the curve with a function, and then applies an optimization algorithm to approximate the fitted curve to the measured points to obtain the correction value. The function can be exponential or polynomial, and the algorithm can be Gauss-Newton, simplex, or steepest descent. The wavefront error method uses interferometers to measure the wavefront error (imaging error) of the optical lens. The original design wavefront error is then used to comprehensively analyze the wavefront error generated during manufacturing and assembly. The correction value is then optimized using optical software.

[0141] Another embodiment of the present disclosure provides an imaging device comprising the aforementioned optical lens, a diffractive element, and an electronic photosensitive element. At least one surface of the diffractive element includes an anti-reflection coating made of aluminum oxide, and the electronic photosensitive element is disposed on an imaging surface of the optical lens. By applying the aluminum oxide anti-reflection coating to the diffractive element, the problem of high reflection at the inflection point of the diffractive element can be resolved.

[0142] Another embodiment of another aspect of the present disclosure provides an imaging device comprising the aforementioned optical lens, a curved surface element, and an electronic photosensitive element. At least one surface of the curved surface element includes a phase subwavelength structure, and the electronic photosensitive element is disposed on an imaging surface of the optical lens. By providing the curved surface element with the phase subwavelength structure, the number of optical lenses can be significantly reduced, effectively shortening the overall length of the optical lens, thereby achieving excellent optical lens miniaturization.

[0143] Another aspect of the present disclosure provides an electronic device, which is a mobile device and includes the aforementioned optical lens.

[0144] Based on the above description, specific embodiments are presented below for detailed description.

[0145] <First embodiment>

[0146] The optical lens of the first embodiment includes four optical lenses, namely, optical lens L1, optical lens L2, optical lens L3, and optical lens L4, from the object side to the image side. At least one of the four 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 or the image side of the optical lens. The anti-reflection coating includes at least one film layer, the film layer located outside the anti-reflection coating is made of ceramic. 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. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor of the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0147] The refractive index of the material of the optical lens L1 is Ns, which satisfies the following condition: Ns=1.54. The third factor of the anti-reflection coating configuration of the optical lens L1 is Far3, which satisfies the following condition: Far3=3.38.

[0148] The object side surface of the optical lens L1 is R1, 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: FAR = -0.610, the first factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L1 is Far1, which satisfies the following conditions: Far1 = 0.465, and the second factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L1 is Far2, which satisfies the following conditions: Far2 = 0.156.

[0149] The image side surface of the optical lens L1 is R2, and the main factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L1 is FAR, which satisfies the following conditions: FAR = -2.931, the first factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L1 is Far1, which satisfies the following conditions: Far1 = 0.057, and the second factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L1 is Far2, which satisfies the following conditions: Far2 = 0.006.

[0150] The refractive index of the material of the optical lens L2 is Ns, which satisfies the following condition: Ns = 1.63. The third factor of the anti-reflection coating configuration of the optical lens L2 is Far3, which satisfies the following condition: Far3 = 2.50.

[0151] The object side surface of the optical lens L2 is R1, 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: FAR = -4.577, the first factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L2 is Far1, which satisfies the following conditions: Far1 = 0.013, and the second factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L2 is Far2, which satisfies the following conditions: Far2 = 0.001.

[0152] The image side surface of the optical lens L2 is R2, and the main factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L2 is FAR, which satisfies the following conditions: FAR = -1.052, the first factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L2 is Far1, which satisfies the following conditions: Far1 = 0.413, and the second factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L2 is Far2, which satisfies the following conditions: Far2 = 0.086.

[0153] The refractive index of the material of the optical lens L3 is Ns, which satisfies the following condition: Ns = 1.54. The third factor of the anti-reflection coating configuration of the optical lens L3 is Far3, which satisfies the following condition: Far3 = 3.38.

[0154] The object side surface of the optical lens L3 is R1, 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: FAR = -0.097, the first factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L3 is Far1, which satisfies the following conditions: Far1 = 0.547, and the second factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L3 is Far2, which satisfies the following conditions: Far2 = 0.433.

[0155] The image side surface of the optical lens L3 is R2, and the main factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L3 is FAR, which satisfies the following conditions: FAR = 0.447, the first factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L3 is Far1, which satisfies the following conditions: Far1 = 1.076, and the second factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L3 is Far2, which satisfies the following conditions: Far2 = 0.770.

[0156] The refractive index of the material of the optical lens L4 is Ns, which satisfies the following condition: Ns = 1.53. The third factor of the anti-reflection coating configuration of the optical lens L4 is Far3, which satisfies the following condition: Far3 = 3.56.

[0157] The object side surface of the optical lens L4 is R1, 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: FAR = -0.460, the first factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L4 is Far1, which satisfies the following conditions: Far1 = 0.986, and the second factor of the anti-reflection coating configuration of the object side surface R1 of the optical lens L4 is Far2, which satisfies the following conditions: Far2 = 0.099.

[0158] The image side surface of the optical lens L4 is R2, and the main factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L4 is FAR, which satisfies the following conditions: FAR = 0.363, the first factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L4 is Far1, which satisfies the following conditions: Far1 = 1.125, and the second factor of the anti-reflection coating configuration of the image side surface R2 of the optical lens L4 is Far2, which satisfies the following conditions: Far2 = 0.575.

[0159] Please refer to Figure 1 , Figure 1 1 is a graph showing the relationship between the reflectivity and wavelength of the optical lens of the first embodiment. In addition, the detailed parameters of each optical lens included in the optical lens of the first embodiment are listed in Table 1 below.

[0160]

[0161]

[0162] Among them, the thickness of each substrate on the optical axis is CTs, the maximum value of the horizontal displacement between the intersection of each optical lens surface and the optical axis is SAGmax, the average value of the tangent slope of each optical lens surface within the optical effective diameter range is SPavg, and the minimum value of the tangent slope of each optical lens surface within the optical effective diameter range is SPmin.

[0163] <Second embodiment>

[0164] The optical lens of the second embodiment includes five optical lenses, namely, 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. The optical lens including the anti-reflection coating is made of a plastic material. The anti-reflection coating is located on the object side or image side of the optical lens. The anti-reflection coating includes at least one film layer, the film layer located outside the anti-reflection coating is made of ceramic. 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. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor of the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0165] Please refer to Figure 2 , Figure 2 The relationship between the reflectivity and wavelength of the optical lens of the second embodiment is shown in Table 2. In addition, the detailed parameters of each optical lens included in the optical lens of the second embodiment are listed in Table 2 below. The parameter definitions are the same as those of the first embodiment and will not be repeated here.

[0166]

[0167]

[0168] <Third embodiment>

[0169] The optical lens of the third embodiment includes five optical lenses, namely, 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. The optical lens including the anti-reflection coating is made of a plastic material. The anti-reflection coating is located on the object side or image side of the optical lens. The anti-reflection coating includes at least one film layer, the film layer located outside the anti-reflection coating is made of ceramic. 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. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor of the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0170] Please refer to Figure 3 , Figure 3Graph showing the relationship between reflectivity and wavelength of the optical lens of the third embodiment. Furthermore, the detailed parameters of the various optical lenses included in the optical lens of the third embodiment are listed in Table 3 below. The parameter definitions are the same as those of the first embodiment and are not further detailed here.

[0171]

[0172] <Fourth embodiment>

[0173] The optical lens of the fourth embodiment includes six optical lenses, namely, 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 or the image side of the optical lens. The anti-reflection coating comprises at least one layer, the layer located outside the anti-reflection coating being made of ceramic. 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. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0174] The detailed parameters of the optical lenses included in the optical lens of the fourth embodiment are listed in Table 4 below. The parameter definitions are the same as those of the first embodiment and will not be repeated here.

[0175]

[0176]

[0177]

[0178] <Fifth embodiment>

[0179] The optical lens of the fifth embodiment includes six optical lenses, namely, 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 or the image side of the optical lens. The anti-reflection coating comprises at least one layer, the layer located outside the anti-reflection coating being made of ceramic. 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. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0180] The detailed parameters of the optical lenses included in the optical lens of the fifth embodiment are listed in Table 5 below. The parameter definitions are the same as those of the first embodiment and will not be repeated here.

[0181]

[0182]

[0183]

[0184] <Sixth embodiment>

[0185] The optical lens of the sixth embodiment includes seven optical lenses, namely, 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 or the image side of the optical lens. The anti-reflection coating comprises at least one layer, the layer located outside the anti-reflection coating being made of ceramic. 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. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0186] Please refer to Figure 4 , Figure 4Graph showing the relationship between reflectivity and wavelength for the optical lens of the sixth embodiment. Furthermore, detailed parameters of the various optical lenses included in the optical lens of the sixth embodiment are listed in Table 6 below. The parameter definitions are the same as those for the first embodiment and are not further detailed here.

[0187]

[0188]

[0189]

[0190] <Seventh embodiment>

[0191] The optical lens of the seventh embodiment includes seven optical lenses, namely, 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 or the image side of the optical lens. The anti-reflection coating comprises at least one layer, the layer located outside the anti-reflection coating being made of ceramic. 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. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0192] Please refer to Figure 5 , Figure 5 Graph showing the relationship between reflectivity and wavelength for the optical lens of the seventh embodiment. Furthermore, detailed parameters of the various optical lenses included in the optical lens of the seventh embodiment are listed in Table 7 below. The parameter definitions are the same as those for the first embodiment and are not further detailed here.

[0193]

[0194]

[0195]

[0196] <Eighth embodiment>

[0197] The optical lens of the eighth embodiment includes seven optical lenses, namely, 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 either the object side or the image side of the optical lens. The anti-reflection coating comprises at least one layer, the layer located outside the anti-reflection coating being made of ceramic. 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. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0198] The detailed parameters of the optical lenses included in the optical lens of the eighth embodiment are listed in Table 8 below. The parameter definitions are the same as those of the first embodiment and will not be repeated here.

[0199]

[0200]

[0201] Ninth embodiment

[0202] The optical lens of the ninth embodiment includes seven optical lenses, namely, 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 either the object side or the image side of the optical lens. The anti-reflection coating comprises at least one layer, the layer located outside the anti-reflection coating being made of ceramic. 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. The total thickness of the anti-reflection coating located at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating located at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0203] The detailed parameters of the optical lenses included in the optical lens of the ninth embodiment are listed in Table 9 below. The parameter definitions are the same as those of the first embodiment and will not be repeated here.

[0204]

[0205]

[0206] <Tenth embodiment>

[0207] The optical lens of the tenth embodiment includes eight optical lenses, namely, from the object side to the image side, 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. 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 either the object side or the image side of the optical lens. The anti-reflection coating comprises at least one layer, the layer located outside the anti-reflection coating being made of ceramic. 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. The total thickness of the anti-reflection coating at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0208] The detailed parameters of the optical lenses included in the optical lens of the tenth embodiment are listed in Table 10 below. The parameter definitions are the same as those of the first embodiment and will not be repeated here.

[0209]

[0210]

[0211]

[0212] <Eleventh Example>

[0213] The optical lens of the eleventh embodiment includes eight optical lenses, namely, 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 either the object side or the image side of the optical lens. The anti-reflection coating comprises at least one layer, the layer located outside the anti-reflection coating being made of ceramic. 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. The total thickness of the anti-reflection coating at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0214] The detailed parameters of the optical lenses included in the optical lens of the eleventh embodiment are listed in Table 11 below. The parameter definitions are the same as those of the first embodiment and will not be repeated here.

[0215]

[0216]

[0217]

[0218] <Twelfth embodiment>

[0219] The optical lens of the twelfth embodiment includes nine optical lenses, namely, from the object side to the image side, 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. 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 either the object side or the image side of the optical lens. The anti-reflection coating comprises at least one layer, the layer located outside the anti-reflection coating being made of ceramic. 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. The total thickness of the anti-reflection coating at the center of the optical lens is Tc, and the total thickness of the anti-reflection coating at the periphery of the optical lens is Tp. The main factor for the anti-reflection coating configuration of the optical lens is FAR, which satisfies the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR.

[0220] The detailed parameters of the optical lenses included in the optical lens of the twelfth embodiment are listed in Table 12 below. The parameter definitions are the same as those of the first embodiment and will not be repeated here.

[0221]

[0222]

[0223]

[0224] Wavelength and reflectivity measurement results

[0225] Table 13 below shows the reflectivity measurement results of the first comparative example and the first embodiment.

[0226]

[0227]

[0228] Table 14 below shows the reflectivity measurement results of the second embodiment and the third embodiment.

[0229]

[0230]

[0231]

[0232] Table 15 below shows the reflectivity measurement results of the sixth and seventh embodiments.

[0233]

[0234]

[0235] Please refer to Figures 1 to 6 , Figure 6 This is a graph showing the relationship between reflectivity and wavelength for the optical lens of the first comparative example. The optical lens of this disclosure exhibits a certain number of reflectivity troughs and peaks within the wavelength range of 400nm-700nm. The reflectivity troughs are defined as T1, T2, T3, and so on, increasing from short wavelengths to long wavelengths, relative to the center of the optical lens. The reflectivity peaks are defined as C1, C2, and so on, increasing from short wavelengths to long wavelengths, relative to the center of the optical lens.

[0236] Based on the above, we can compare the reflectivity difference between the center and the periphery (near the maximum effective diameter) of the optical lens. Figure 6It can be seen that the reflectivity difference between the center and the periphery of the first comparative example is too large, and there are no obvious and equal reflectivity peaks and reflectivity troughs, so it cannot be compared, indicating that the coating technology of the first comparative example is insufficient and the film thickness control is poor.

[0237] The reflectivity described in the present invention is the measurement data of the surface of the optical element, and the transmittance is the measurement data of the entire optical lens assembly.

[0238] <Anti-reflective coating configuration and image quality measurement results>

[0239] Table 16, Table 17, and Table 18 below respectively show the anti-reflection coating configurations of the first comparative example, the second embodiment, and the seventh embodiment.

[0240]

[0241]

[0242]

[0243]

[0244] The anti-reflective coating configuration (Coating Design) is only used as an example in the second and seventh embodiments. The same coating design or a modified coating design can also be applied to the optical lenses of other embodiments. The number of anti-reflective coating layers, the material of the optical lens, and the high-refractive index and low-refractive index materials of the anti-reflective coating can be changed as needed. After evaluating the optimal configuration factors, it can be applied to different optical lenses and the most suitable optical lenses. The refractive index of the outer Al2O3 film layer gradually changes from a lower refractive index to a higher refractive index from the outside (air) to the inside (substrate). The effect of this gradient refractive index film layer is approximately equivalent to a film layer with a refractive index of approximately 1.21.

[0245] The reference wavelength for measuring the refractive index of the present invention is 510 nm or 587.6 nm.

[0246] In addition to the anti-reflection coating configurations mentioned in Table 17 and Table 18 above, the anti-reflection coating of the present disclosure may also have the following configurations:

[0247] (1) The anti-reflective coating is made by atomic layer deposition coating technology. The anti-reflective coating can include six film layers. The materials of the film layer from the inner side to the outer side of the anti-reflective coating are TiO2, SiO2, TiO2, SiO2, TiO2 and Al2O3 respectively, and the optical lens including the anti-reflective coating is made of a plastic material.

[0248] (2) The anti-reflective coating is made by atomic layer deposition coating technology. The anti-reflective coating can include eight film layers. The materials of the film layer from the inner side to the outer side of the anti-reflective coating are Al2O3, TiO2, SiO2, TiO2, SiO2, TiO2, SiO2 and Al2O3 respectively, and the optical lens including the anti-reflective coating is made of a plastic material.

[0249] (3) The anti-reflective coating is made by atomic layer deposition coating technology. The anti-reflective coating can include seven film layers. The materials of the film layer from the inner side to the outer side of the anti-reflective coating are Al2O3, TiO2, SiO2, TiO2, SiO2, TiO2 and SiO2 respectively, and the optical lens including the anti-reflective coating is made of a plastic material.

[0250] (4) The anti-reflective coating is made by atomic layer deposition coating technology. The anti-reflective coating can include two film layers. The materials of the film layer on the inner side and the film layer on the outer side of the anti-reflective coating are Al2O3 and MgF2 respectively, and the optical lens including the anti-reflective coating is made of a plastic material.

[0251] (5) The anti-reflective coating is made by atomic layer deposition coating technology. The anti-reflective coating can include two film layers. The materials of the film layer on the inner side and the film layer on the outer side of the anti-reflective coating are Al2O3 and SiO2 respectively, and the optical lens including the anti-reflective coating is made of a plastic material.

[0252] (6) The anti-reflective coating is made by atomic layer deposition coating technology. The anti-reflective coating can include three film layers. The materials of the film layer on the inner side and the film layer on the outer side of the anti-reflective coating are Al2O3, SiO2 and MgF2 respectively, and the optical lens including the anti-reflective coating is made of a plastic material.

[0253] (7) The anti-reflective coating is made by atomic layer deposition coating technology. The anti-reflective coating may include a film layer, the material of the film layer is AlN, and the optical lens including the anti-reflective coating is made of a plastic material.

[0254] Table 19 below is a comparison of the thickness of the anti-reflection coating at the center and periphery of the optical lens of the first comparative example, the second embodiment and the seventh embodiment.

[0255]

[0256] Please refer to Figure 7A and Figure 7B , Figure 7A This is a test chart of the image quality of the optical lens of the first comparative example under strong light with an incident angle of 55 degrees. Figure 7BThis is a test chart of the image quality of the optical lens of the second embodiment under strong light with an incident angle of 55 degrees. The anti-reflection coating of the second embodiment is made by atomic layer deposition coating technology. Figure 7A and Figure 7B It can be seen that although both the first comparative example and the second embodiment have oblique stripe flare, the flare intensity of the second embodiment is significantly lower than that of the first comparative example, indicating that the optical lens of the second embodiment can indeed achieve better imaging quality.

[0257] Furthermore, please refer to Figure 8A and Figure 8B , Figure 8A is a cross-sectional view at the center of an optical lens including an anti-reflective coating according to a seventh embodiment, Figure 8B FIG. 7 is a cross-sectional view of the periphery of an optical lens including an anti-reflection coating according to the seventh embodiment. Figure 8A and Figure 8B It is obvious that the holes on the outside of the anti-reflection coating are relatively larger than those on the inside. This indicates that in the same plane, the irregular branched nanofiber structure on the outside of the anti-reflection coating is sparsely distributed, while the irregular branched nanofiber structure on the inside is densely distributed.

[0258] <Thirteenth embodiment>

[0259] The anti-reflection element of the optical lens of the thirteenth embodiment may include at least one filter element or a protective glass, namely, filter element F1, filter element F2, filter element F3, filter element F4, filter element F5, filter element F6, or protective glass G1. Detailed parameters and sizes of the filter elements and protective glass that may be included in the optical lens of the thirteenth embodiment are listed in Table 20 below. The parameter definitions are the same as those of the first embodiment and are not further detailed here.

[0260]

[0261] Table 21 and Table 22 below respectively show two anti-reflection coating configurations of the thirteenth embodiment.

[0262]

[0263]

[0264]

[0265] In the anti-reflection coating disclosed herein, the layer closest to the substrate is the first layer, followed by the second layer, the third layer, and so on, with the second layer in contact with the first layer, and so on. The refractive index of the first layer is N1, the refractive index of the second layer is N2, and so on.

[0266] In an anti-reflection coating configuration of the thirteenth embodiment, the substrate is glass or plastic, the refractive index of the substrate is 1.53-1.92, and the thickness of the substrate is 0.20 mm, 0.30 mm, or 0.55 mm. The first film layer is SiO2, the refractive index of the first film layer is 1.46, and the thickness of the first film layer is 21 nm. The second film layer is TiO2, the refractive index of the second film layer is 2.35, and the thickness of the second film layer is 9 nm. The third film layer is SiO2, the refractive index of the third film layer is 1.46, and the thickness of the third film layer is 48 nm. The fourth film layer is TiO2, the refractive index of the fourth film layer is 2.35, and the thickness of the fourth film layer is 4 nm. The fifth film layer is SiO2, the refractive index of the fifth film layer is 1.46, and the thickness of the fifth film layer is 65 nm. The sixth film layer is Al2O3, the sixth film layer has a graded refractive index and an equivalent refractive index of approximately 1.21, and the thickness of the sixth film layer is 120 nm. The equivalent refractive index of the sixth film layer is smaller than that of the first film layer, the second film layer, the third film layer, the fourth film layer, the fifth film layer and the substrate; the refractive index of the fifth film layer is smaller than that of the fourth film layer; the refractive index of the fourth film layer is greater than that of the third film layer; the refractive index of the third film layer is smaller than that of the second film layer; the refractive index of the second film layer is greater than that of the first film layer; and the refractive index of the first film layer is smaller than that of the substrate.

[0267] In another anti-reflection coating configuration of the thirteenth embodiment, the substrate is glass or plastic, the substrate has a refractive index of 1.53-1.92, and the substrate thickness is 0.20 mm, 0.30 mm, or 0.55 mm. The first film layer is SiO2, the first film layer has a refractive index of 1.46, and the first film layer has a thickness of 100 nm. The second film layer is Al2O3, the second film layer has a graded refractive index, an equivalent refractive index of approximately 1.21, and the second film layer has a thickness of 115 nm. The equivalent refractive index of the second film layer is lower than that of the first film layer and the substrate, and the refractive index of the first film layer is lower than that of the substrate.

[0268] Please refer to Figure 9A and Figure 9B , Figure 9A This is a test chart of the image quality of the optical lens of the first comparative example under strong light with a large incident angle (19 degrees). Figure 9B This is a test chart of the image quality of the optical lens of the thirteenth embodiment under strong light with a large incident angle (19 degrees). Figure 9A and Figure 9B It can be seen that the first comparative example has obvious stray light in the corners of the image, while the thirteenth embodiment has no obvious stray light in the corners of the image, indicating that the optical lens of the thirteenth embodiment can effectively improve the problem of corner stray light under strong light conditions at large angles.

[0269] Furthermore, please refer to Figure 10A and Figure 10B , Figure 10AThis is a test chart of the image quality of the microlens of the first comparative example. Figure 10B This is a test chart of the image quality of the microlens of the thirteenth embodiment. Figure 10A and Figure 10B It can be seen that the first comparative example has obvious petal-shaped stray light, while the thirteenth embodiment has none, which means that the optical lens of the thirteenth embodiment can significantly improve the problem of petal-shaped stray light.

[0270] <Reflectivity and transmittance measurement results>

[0271] Tables 23 and 24 below are the reflectivity measurement results of the second comparative example, the fourteenth embodiment, and the fifteenth embodiment.

[0272]

[0273]

[0274]

[0275]

[0276]

[0277]

[0278]

[0279] Please refer to Figures 11 to 13 , Figure 11 is a graph showing the relationship between the reflectivity and wavelength of the anti-reflection element of the second comparative example, Figure 12 is a graph showing the relationship between the reflectivity and wavelength of the anti-reflection element of the fourteenth embodiment, Figure 13 FIG. 1 is a graph showing the relationship between the reflectivity and wavelength of the anti-reflection element of the fifteenth embodiment. Figures 11 to 13 It can be seen that the reflectivity of the fourteenth embodiment and the fifteenth embodiment is significantly lower than that of the second comparative example, indicating that the fourteenth embodiment and the fifteenth embodiment can achieve excellent anti-reflection effects by adopting different coating methods.

[0280] Table 25 and Table 26 below are the transmittance measurement results of the second comparative example and the fourteenth embodiment.

[0281]

[0282]

[0283]

[0284]

[0285]

[0286]

[0287] Please refer to Figure 14 and Figure 15 , Figure 14 is a graph showing the relationship between the transmittance and wavelength of the anti-reflection element of the second comparative example, Figure 15 FIG1 is a graph showing the relationship between the transmittance and wavelength of the anti-reflection element of the fourteenth embodiment. Figure 14 and Figure 15 It can be seen that the transmittances of the fourteenth embodiment and the second comparative example at different wavelengths are similar, which means that the fourteenth embodiment can maintain good transmittance at short wavelengths and also have good filtering effect at long wavelengths.

[0288] <Fifteenth embodiment>

[0289] Please refer to Figure 16 , Figure 16 The imaging device of the fifteenth embodiment includes, from the object side to the image side, a curved surface device 110 , an optical lens 120 , and an electronic photosensitive element 150 , and the electronic photosensitive element 150 is disposed on the imaging surface 140 of the optical lens 120 .

[0290] Please refer to 17A to 17D , Figure 17A 、 Figure 17B 、 Figure 17C and Figure 17D They are Figure 16 The image capturing device is shown as a partially enlarged schematic diagram at positions 17A, 17B, 17C and 17D.

[0291] The object side surface 111 of the curved element 110 includes a phase sub-wavelength structure, the detailed structure of which is as follows: Figure 17A As shown, the object side surface 121 of the optical lens 120 includes a graphene structure, the detailed structure of which is as follows Figure 17B As shown, the image side surface 122 of the optical lens 120 includes an anti-reflection coating, the detailed structure of which is as shown in FIG. Figure 17C The imaging device may further include a phase sub-wavelength structure 130, the detailed structure of which is as shown in FIG. Figure 17D shown.

[0292] Please refer to Figure 18 , Figure 18Schematic diagram of a diffractive element 160 in an imaging device. The imaging device may further include a diffractive element 160, and at least one surface of the diffractive element 160 may include an anti-reflection coating. The material of the anti-reflection coating of the diffractive element 160 may be aluminum oxide. In this embodiment, the object-side surface 161 of the diffractive element 160 includes an anti-reflection coating, and its detailed structure is as follows: Figure 17C shown.

[0293] Thus, in the optical lens of the multi-optical lens disclosed herein, an anti-reflective coating is prepared on a specific optical lens with a significant range of surface shape changes using a high-order coating technology, and the thickness of the anti-reflective coating at the center and the periphery of the optical lens is highly consistent, thereby achieving a uniform and consistent anti-reflective effect across the entire field of view, and controlling the offset amplitude of the reflectivity waveform change within a small range, which helps maintain the consistency of the anti-reflective efficiency and achieve the high specification requirements and high image quality of the optical lens of the multi-optical lens. The disclosed content focuses on controlling the coating configuration technology in the optical lens, which not only gives full play to the application value of the high-order coating technology, but also obtains the best production effect of the anti-reflective coating, so that the optical lens with a large range of surface shape changes can obtain a consistent anti-reflective effect within the effective diameter range of the entire field of view, thereby reducing the reflection problem of strong light at large angles and improving the image quality of the overall optical lens.

[0294] Although the present disclosure has been disclosed above with reference to the embodiments, it is not intended to limit the present disclosure. Anyone skilled in 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 appended claims.

Claims

1. An optical lens, characterized in that: The optical lens from the object side to the image side includes: At least four optical lenses; At least one of the optical lenses comprises an anti-reflective coating, the optical lens comprising the anti-reflective coating is a plastic lens, the anti-reflective coating is located on the object-side surface or the image-side surface of the optical lens, the anti-reflective coating comprises at least one film layer, the film layer located on the outer side of the anti-reflective coating is a ceramic film layer, the anti-reflective coating comprises a plurality of holes, and the size of the holes adjacent to the outer side of the anti-reflective coating is larger than the size of the holes adjacent to the inner side of the anti-reflective coating; The total thickness of the anti-reflection coating at the center of the optical lens is Tc, the total thickness of the anti-reflection coating at the periphery of the optical lens is Tp, the optical lens is a substrate, the thickness of the substrate on the optical axis is CTs, 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 = |SAGmax| / CTs, 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 substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)). 2 The main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR = LOG (Far1 × Far2 × Far3), which meets the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR≤10.

2. The optical lens according to claim 1, wherein: The thickness of the substrate on the optical axis is CTs, the maximum horizontal displacement between the intersection of the optical axis and the surface of the optical lens is SAGmax, and the first factor of the anti-reflection coating configuration of the optical lens is Far1, Far1 = |SAGmax| / CTs, which satisfies the following conditions: 0.500≤Far1≤3.

350.

3. The optical lens according to claim 2, wherein: 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.

914.

4. The optical lens according to claim 3, wherein: The refractive index of the substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2 , which satisfies the following conditions: 2.5≤Far3≤3.

6.

5. The optical lens according to claim 1, wherein: The refractive index of the substrate is Ns, which satisfies the following conditions: Ns≤1.7682.

6. The optical lens according to claim 5, wherein: The film layer located outside the anti-reflection coating film is an aluminum oxide film layer.

7. The optical lens according to claim 6, wherein: The anti-reflection coating film includes at least three film layers, and the materials of the at least three film layers are different.

8. The optical lens according to claim 1, wherein: The wavelength of the reflectivity valley point at the center of the optical lens with relatively low reflectivity within a range is Wtc, and the wavelength of the reflectivity valley point at the periphery of the optical lens with relatively low reflectivity within a range is Wtp, which meets the following conditions: 0nm≤|Wtc-Wtp|≤25nm.

9. The optical lens according to claim 8, wherein: The reflectivity valley point at the center of the optical lens has a relatively low reflectivity Rtc within a range that satisfies the following conditions: 0% <Rtc≤0.300%。 10. The optical lens according to claim 9, wherein: The reflectivity valley point at the periphery of the optical lens has a relatively low reflectivity Rtp within a range that satisfies the following conditions: 0% <Rtp≤0.300%。 11. The optical lens according to claim 1, wherein: The wavelength of the reflectivity peak at the center of the optical lens with a relatively high reflectivity within a range is Wcc, and the wavelength of the reflectivity peak at the periphery of the optical lens with a relatively high reflectivity within a range is Wcp, which meets the following conditions: 0nm≤|Wcc-Wcp|≤20nm.

12. The optical lens according to claim 11, wherein: The reflectivity peak at the center of the optical lens has a relatively high reflectivity Rcc within a range that satisfies the following conditions: 0.200%≤Rcc≤0.700%.

13. The optical lens according to claim 12, wherein: The reflectivity peak point at the periphery of the optical lens has a relatively high reflectivity Rcp within a range that satisfies the following conditions: 0.200%≤Rcp≤0.700%.

14. The optical lens according to claim 1, wherein: At least one surface of the optical lens including the anti-reflection coating includes at least one inflection point.

15. The optical lens according to claim 1, wherein: The total number of layers of the anti-reflection coating is tLs, which meets the following conditions: 1≤tLs≤8.

16. The optical lens according to claim 1, wherein: The total thickness of the anti-reflection coating is tTk, which meets the following conditions: 200nm <tTk≤400nm。 17. An imaging device, characterized in that: Include: An optical lens, comprising, from the object side to the image side: At least four optical lenses; At least one of the optical lenses comprises an anti-reflective coating, the optical lens comprising the anti-reflective coating is a plastic lens, the anti-reflective coating is located on the object-side surface or the image-side surface of the optical lens, the anti-reflective coating comprises at least one film layer, the film layer located on the outer side of the anti-reflective coating is a ceramic film layer, the anti-reflective coating comprises a plurality of holes, and the size of the holes adjacent to the outer side of the anti-reflective coating is larger than the size of the holes adjacent to the inner side of the anti-reflective coating; The total thickness of the anti-reflection coating at the center of the optical lens is Tc, the total thickness of the anti-reflection coating at the periphery of the optical lens is Tp, the optical lens is a substrate, the thickness of the substrate on the optical axis is CTs, 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| / CTs, 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 substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2 The main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR = LOG (Far1 × Far2 × Far3), which meets the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR≤10; a diffractive element, at least one surface of which comprises an anti-reflection coating, wherein the anti-reflection coating of the diffractive element is an aluminum oxide coating; and An electronic photosensitive element is arranged on an imaging surface of the optical lens.

18. An imaging device, characterized in that: Include: An optical lens, comprising, from the object side to the image side: At least four optical lenses; At least one of the optical lenses comprises an anti-reflective coating, the optical lens comprising the anti-reflective coating is a plastic lens, the anti-reflective coating is located on the object-side surface or the image-side surface of the optical lens, the anti-reflective coating comprises at least one film layer, the film layer located on the outer side of the anti-reflective coating is a ceramic film layer, the anti-reflective coating comprises a plurality of holes, and the size of the holes adjacent to the outer side of the anti-reflective coating is larger than the size of the holes adjacent to the inner side of the anti-reflective coating; The total thickness of the anti-reflection coating at the center of the optical lens is Tc, the total thickness of the anti-reflection coating at the periphery of the optical lens is Tp, the optical lens is a substrate, the thickness of the substrate on the optical axis is CTs, 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| / CTs, 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 substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2 The main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR = LOG (Far1 × Far2 × Far3), which meets the following conditions: |Tc-Tp| / Tc≤5.00%; and -1.5≤FAR≤10; a curved element, at least one surface of which comprises a phase sub-wavelength structure; and An electronic photosensitive element is arranged on an imaging surface of the optical lens.

19. An electronic device, being a mobile device, characterized in that: The electronic device comprises: The imaging device according to claim 17.

20. An optical lens, characterized in that: The optical lens from the object side to the image side includes: at least one optical lens; and at least one anti-reflective element; Among them, at least one surface of at least one of the antireflection elements includes an antireflection coating film. The antireflection element including the antireflection coating film is a glass element. The antireflection coating film includes at least two film layers. One of the film layers closest to a substrate of the antireflection element is a first film layer, and the refractive index of the first film layer is less than the refractive index of the substrate; Among them, the film layer located outside the antireflection coating film is an aluminum oxide film layer. The antireflection coating film includes a plurality of holes. The sizes of the holes adjacent to the outside of the antireflection coating film are larger than the sizes of the holes adjacent to the inside of the antireflection coating film, and the outermost film layer has a gradually changing refractive index; Wherein, the total film thickness of the anti-reflection coating is tTk, the thickness of the substrate on the optical axis is CTs, 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 = |SAGmax| / CTs, 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 substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2 The main factor of the anti-reflection coating configuration of the optical lens is FAR, FAR = LOG (Far1 × Far2 × Far3), which meets the following conditions: 200nm < tTk ≤ 400nm; and -1.5 ≤ FAR ≤ 10.

21. The optical lens according to claim 20, wherein: The substrate is a flat plate element.

22. The optical lens according to claim 21, wherein: The thickness of the substrate on the optical axis is CTs, which satisfies the following conditions: 0.15mm < CTs ≤ 0.60mm.

23. The optical lens according to claim 22, wherein: The refractive index of the substrate is Ns, and the third factor of the anti-reflection coating configuration of the optical lens is Far3, Far3 = (1 / (Ns-1)) 2 , which satisfies the following conditions: 1.0 ≤ Far3 ≤ 5.

0.

24. The optical lens according to claim 23, wherein: 0％≤R4063≤1.3％。 25. The optical lens according to claim 24, wherein: The average reflectance of the substrate at wavelengths of 400nm - 630nm is R4063, which satisfies the following conditions: 0％≤R67100≤3.0％。 26. The optical lens according to claim 25, wherein: The average reflectance of the substrate at wavelengths of 670nm - 1000nm is R67100, which satisfies the following conditions: 95％≤T4060≤100％。 27. The optical lens according to claim 26, wherein: The average transmittance of the substrate at wavelengths of 400nm - 600nm is T4060, which satisfies the following conditions:

28. The optical lens according to claim 20, wherein: The antireflection coating film has a second film layer. The refractive index of the second film layer is greater than the refractive index of the first film layer. The refractive index of the second film layer is greater than the refractive index of the substrate, and the refractive index of the outermost film layer is equivalently less than the refractive indices of the first film layer and the substrate. The substrate is a microlens.

Images