Optical lenses and electronic devices containing them

Abstract

This invention provides an optical lens and an electronic device having the same. The optical lens includes: a first lens having positive optical power and a first side surface that is convex; a second lens having negative optical power, with both the first and second side surfaces of the second lens being concave; a third lens having positive optical power and a second side surface that is convex; a fourth lens having positive optical power and a first side surface that is convex; a fifth lens having positive optical power, with a first side surface that is convex and a second side surface that is concave; and a sixth lens having positive optical power, with a first side surface that is convex and a second side surface that is concave. This invention solves at least one of the following problems in the prior art: difficulty in miniaturizing optical lenses, poor image quality in low-light environments, difficulty in achieving a small FNO (focal number), and severe ghosting.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical lens and an electronic device having the same. Background Technology

[0002] With technological advancements and increasing application demands, optical lenses have become widely used in many devices, and users' requirements for them are also rising. To improve image quality, optical lenses utilize a large number of lenses; however, with increasing device integration, smaller lens sizes are needed for installation. This is especially true for LiDAR lenses, which are crucial components for acquiring external information in autonomous driving assistance systems. As these systems rapidly develop, user demands for LiDAR lenses are also increasing. To meet safe driving requirements and accommodate specific installation locations, LiDAR lenses in autonomous driving assistance systems have more unique requirements. However, existing optical lenses cannot simultaneously meet the requirements for small front-end diameter and miniaturization, and they also suffer from insufficient light transmission, making them unsuitable for low-light environments such as nighttime or rainy days. Furthermore, existing optical lenses cannot simultaneously meet the requirements for small FNO (field-to-noise ratio), and are affected by ghosting, limiting image clarity and failing to meet user needs.

[0003] In other words, existing optical lenses suffer from at least one of the following problems: difficulty in miniaturization, poor image quality in low-light conditions, difficulty in achieving a small FNO, and severe ghosting. Summary of the Invention

[0004] The main objective of this invention is to provide an optical lens and an electronic device having the same, in order to solve at least one of the following problems in the prior art: difficulty in miniaturizing optical lenses, poor imaging quality in dark environments, difficulty in achieving small FNO, and severe ghosting.

[0005] To achieve the above objectives, according to one aspect of the present invention, an optical lens is provided, comprising: a first lens having positive optical power and a first side surface of the first lens being convex; a second lens having negative optical power, and both the first side surface of the second lens and the second side surface of the second lens being concave; a third lens having positive optical power and a second side surface of the third lens being convex; a fourth lens having positive optical power and a first side surface of the fourth lens being convex; a fifth lens having positive optical power, a first side surface of the fifth lens being convex and a second side surface of the fifth lens being concave; and a sixth lens having positive optical power, a first side surface of the sixth lens being convex and a second side surface of the sixth lens being concave.

[0006] Furthermore, the second side surface of the first lens is concave.

[0007] Furthermore, the second side surface of the first lens is convex.

[0008] Furthermore, the first side surface of the third lens is concave.

[0009] Furthermore, the first side surface of the third lens is convex.

[0010] Furthermore, the second side surface of the fourth lens is concave.

[0011] Furthermore, the second side surface of the fourth lens is convex.

[0012] Furthermore, the optical lens also includes an aperture stop, which is located between the fourth lens and the fifth lens.

[0013] Furthermore, the total optical length (TTL) of the optical lens, the image height (H) corresponding to the maximum field of view of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: TTL / H / FOV≤0.4.

[0014] Furthermore, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: TTL / H / tan(FOV)≤15.

[0015] Furthermore, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: D / H / θ≤8.

[0016] Furthermore, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: D / H / FOV≤0.15.

[0017] Furthermore, the total focal length F of the optical lens, the radian value θ of the maximum field of view of the optical lens, and the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: (F*θ) / D≥0.15.

[0018] Furthermore, the optical back focal length (BFL) and the optical total length (TTL) of the optical lens satisfy the following condition: BFL / TTL≤0.3.

[0019] Furthermore, the optical back focal length (BFL) of the optical lens and the lens group length (TL) of the optical lens satisfy the following condition: BFL / TL≤0.3.

[0020] Furthermore, the focal length F3 of the third lens and the focal length F4 of the fourth lens satisfy the following condition: |F3 / F4|≤1.7.

[0021] Furthermore, the sagitta SAG4 of the second side of the second lens and the maximum aperture D4 of the second side of the second lens corresponding to the maximum field of view of the optical lens satisfy the following condition: arctan(SAG4 / D4)≥2.

[0022] Furthermore, the radius of curvature R7 of the first side surface of the fourth lens and the radius of curvature R8 of the second side surface of the fourth lens satisfy the following condition: |R7 / R8|≤2.

[0023] Furthermore, the total focal length F of the optical lens, the radius of curvature R3 of the first side of the second lens, and the radius of curvature R4 of the second side of the second lens satisfy the following condition: 0.6≤|F / R3|+|F / R4|≤1.3.

[0024] Furthermore, the overall focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: F / ENPD≤1.

[0025] Furthermore, the total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 1≤F / H≤3.

[0026] Furthermore, the total focal length F of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.5≤(H / 2) / (F*tan(θ / 2))≤1.5.

[0027] Furthermore, the total optical length (TTL) of the optical lens and the total focal length (F) of the optical lens must satisfy the following condition: TTL / F ≤ 5.

[0028] Furthermore, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy the following condition: F1 / F≥1.5.

[0029] Furthermore, the focal length F2 of the second lens and the total focal length F of the optical lens satisfy the following condition: F2 / F≤-0.1.

[0030] Furthermore, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy the following condition: F3 / F≥1.

[0031] Furthermore, the focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy the following condition: F4 / F≥2.

[0032] Furthermore, the focal length F5 of the fifth lens and the total focal length F of the optical lens satisfy the following condition: F5 / F≥1.

[0033] Furthermore, the focal length F6 of the sixth lens and the total focal length F of the optical lens satisfy the following condition: F6 / F≥2.5.

[0034] Furthermore, the radius of curvature R2 of the second side surface of the first lens and the radius of curvature R3 of the first side surface of the second lens satisfy the following condition: 0.2≤(R2-R3) / (R2+R3)≤2.3.

[0035] Furthermore, the center thickness of the m-th lens on the optical axis is the largest among all the center thicknesses of the lenses in the optical lens, and the center thickness of the n-th lens on the optical axis is the smallest among all the center thicknesses of the lenses in the optical lens. The center thickness dm of the m-th lens on the optical axis and the center thickness dn of the n-th lens on the optical axis satisfy the following condition: 0 ≤ dn / dm ≤ 0.8, where m and n take values ​​from 1, 2, 3, 4, 5, 6.

[0036] Furthermore, the distance T23 between the second and third lenses on the optical axis of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: T23 / TTL≥0.08.

[0037] Furthermore, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: R3 / R4≤-0.1.

[0038] According to another aspect of the present invention, an optical lens is provided, comprising: a first lens having positive optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having positive optical power; a fifth lens having positive optical power; and a sixth lens having positive optical power; wherein the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: R3 / R4≤-0.1.

[0039] Furthermore, the first side surface of the first lens is convex, and the second side surface of the first lens is concave.

[0040] Furthermore, the first side surface of the first lens is convex, and the second side surface of the first lens is also convex.

[0041] Furthermore, both the first side surface of the second lens and the second side surface of the second lens are concave.

[0042] Furthermore, the first side surface of the third lens is concave, and the second side surface of the third lens is convex.

[0043] Furthermore, the first side surface of the third lens is convex, and the second side surface of the third lens is also convex.

[0044] Furthermore, the first side surface of the fourth lens is convex, and the second side surface of the fourth lens is concave.

[0045] Furthermore, the first side surface of the fourth lens is convex, and the second side surface of the fourth lens is also convex.

[0046] Furthermore, the first side surface of the fifth lens is convex, and the second side surface of the fifth lens is concave.

[0047] Furthermore, the first side surface of the sixth lens is convex, and the second side surface of the sixth lens is concave.

[0048] Furthermore, the optical lens also includes an aperture stop, which is located between the fourth lens and the fifth lens.

[0049] Furthermore, the total optical length (TTL) of the optical lens, the image height (H) corresponding to the maximum field of view of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: TTL / H / FOV≤0.4.

[0050] Furthermore, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: TTL / H / tan(FOV)≤15.

[0051] Furthermore, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: D / H / θ≤8.

[0052] Furthermore, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: D / H / FOV≤0.15.

[0053] Furthermore, the total focal length F of the optical lens, the radian value θ of the maximum field of view of the optical lens, and the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: (F*θ) / D≥0.15.

[0054] Furthermore, the optical back focal length (BFL) and the optical total length (TTL) of the optical lens satisfy the following condition: BFL / TTL≤0.3.

[0055] Furthermore, the optical back focal length (BFL) of the optical lens and the lens group length (TL) of the optical lens satisfy the following condition: BFL / TL≤0.3.

[0056] Furthermore, the focal length F3 of the third lens and the focal length F4 of the fourth lens satisfy the following condition: |F3 / F4|≤1.7.

[0057] Furthermore, the sagitta SAG4 of the second side of the second lens and the maximum aperture D4 of the second side of the second lens corresponding to the maximum field of view of the optical lens satisfy the following condition: arctan(SAG4 / D4)≥2.

[0058] Furthermore, the radius of curvature R7 of the first side surface of the fourth lens and the radius of curvature R8 of the second side surface of the fourth lens satisfy the following condition: |R7 / R8|≤2.

[0059] Furthermore, the total focal length F of the optical lens, the radius of curvature R3 of the first side of the second lens, and the radius of curvature R4 of the second side of the second lens satisfy the following condition: 0.6≤|F / R3|+|F / R4|≤1.3.

[0060] Furthermore, the overall focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: F / ENPD≤1.

[0061] Furthermore, the total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 1≤F / H≤3.

[0062] Furthermore, the total focal length F of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.5≤(H / 2) / (F*tan(θ / 2))≤1.5.

[0063] Furthermore, the total optical length (TTL) of the optical lens and the total focal length (F) of the optical lens must satisfy the following condition: TTL / F ≤ 5.

[0064] Furthermore, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy the following condition: F1 / F≥1.5.

[0065] Furthermore, the focal length F2 of the second lens and the total focal length F of the optical lens satisfy the following condition: F2 / F≤-0.1.

[0066] Furthermore, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy the following condition: F3 / F≥1.

[0067] Furthermore, the focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy the following condition: F4 / F≥2.

[0068] Furthermore, the focal length F5 of the fifth lens and the total focal length F of the optical lens satisfy the following condition: F5 / F≥1.

[0069] Furthermore, the focal length F6 of the sixth lens and the total focal length F of the optical lens satisfy the following condition: F6 / F≥2.5.

[0070] Furthermore, the radius of curvature R2 of the second side surface of the first lens and the radius of curvature R3 of the first side surface of the second lens satisfy the following condition: 0.2≤(R2-R3) / (R2+R3)≤2.3.

[0071] Furthermore, the center thickness of the m-th lens on the optical axis is the largest among all the center thicknesses of the lenses in the optical lens, and the center thickness of the n-th lens on the optical axis is the smallest among all the center thicknesses of the lenses in the optical lens. The center thickness dm of the m-th lens on the optical axis and the center thickness dn of the n-th lens on the optical axis satisfy the following condition: 0 ≤ dn / dm ≤ 0.8, where m and n take values ​​from 1, 2, 3, 4, 5, 6.

[0072] Furthermore, the distance T23 between the second and third lenses on the optical axis of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: T23 / TTL≥0.08.

[0073] According to another aspect of the present invention, an electronic device is provided, comprising the aforementioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0074] The above technical solution, by setting the first lens to have positive optical power, facilitates light convergence. By making the first side of the first lens convex, it can collect as much light as possible from a wide field of view into the rear optical system, increasing light transmission and improving illumination. It also helps control the aperture of the rear lens, enabling a smaller aperture design. Furthermore, in practical applications, it facilitates the sliding of water droplets, reducing their impact on imaging. Optionally, the second side of the first lens can be concave, which can control the direction of large-angle light rays at the lens edge, promoting a smoother light transition and reducing the sensitivity of the optical lens. Alternatively, the second side of the first lens can also be convex, meaning the first lens is biconvex with a gently sloping shape, allowing light to enter smoothly into the rear system and further smoothing the light path. It should be noted that using a high refractive index material for the first lens is preferable, as it helps reduce the front aperture and improve image quality.

[0075] By setting the second lens to a negative optical power, it is beneficial to properly diffuse the light, allowing the light path to smoothly transition to the third lens and the rear optical lens. By making both the first and second sides of the second lens concave, it is beneficial to reduce ghosting caused by BPF (bandpass filter) reflections, thereby improving image quality.

[0076] By setting the third lens to have positive optical power, it facilitates rapid light convergence. Setting the second side of the third lens to be convex further enables the light to converge and smoothly enter the rear optical system. Optionally, the first side of the third lens can be concave, which, with a fixed third lens aperture, helps achieve a small FNO (field-of-flight) for the optical lens. Alternatively, the first side of the third lens can be set to convex, meaning the third lens is biconvex, which also allows diverging light to converge rapidly and, with a fixed third lens aperture, helps achieve a small FNO for the optical lens.

[0077] By setting the fourth lens to have positive optical power, it facilitates rapid light convergence. Setting the first side of the fourth lens to be convex allows for a smooth transition of large-diameter light rays from the front aperture to the rear optical system. Optionally, the second side of the fourth lens can be concave, meaning the fourth lens has a crescent shape, which also facilitates a smooth light transition and allows diverging light rays to smoothly enter the rear. Alternatively, the second side of the fourth lens can be convex, meaning the fourth lens has a biconvex shape, which can compress the angle of the incident light, achieving a smooth light transition and allowing diverging light rays to smoothly enter the rear, further stabilizing the light path and allowing for a reduction in the aperture of the rear lens.

[0078] By setting the fifth lens to have positive optical power, it is beneficial for light to converge quickly. By making the first side of the fifth lens convex and the second side concave, that is, by making the fifth lens meniscus, the large-diameter light rays at the front end can quickly and smoothly enter the rear optical system, reducing the back focal length to some extent, and thus reducing the overall length of the optical lens. This also helps to improve image resolution.

[0079] By setting the sixth lens to have positive optical power, it is beneficial for light to converge quickly onto the imaging surface. By setting the first side of the sixth lens to be convex and the second side to be concave, the shape of the sixth lens is approximately a concentric circle, which allows light to converge quickly and smoothly onto the chip surface, further stabilizing the light path. Attached Figure Description

[0080] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0081] Figure 1 A cross-sectional view of an optical lens according to Example 1 of the present invention is shown;

[0082] Figure 2 A cross-sectional view of the optical lens of Example 2 of the present invention is shown;

[0083] Figure 3 A cross-sectional view of the optical lens of Example 3 of the present invention is shown;

[0084] Figure 4 A cross-sectional view of the optical lens of Example 4 of the present invention is shown;

[0085] Figure 5 A cross-sectional view of the optical lens of Example 5 of the present invention is shown;

[0086] Figure 6 A cross-sectional view of the optical lens of Example Six of the present invention is shown;

[0087] Figure 7 A cross-sectional view of the optical lens of Example Seven of the present invention is shown;

[0088] Figure 8 A cross-sectional view of the optical lens of Example 8 of the present invention is shown;

[0089] Figure 9 A cross-sectional view of the optical lens of Example Nine of the present invention is shown;

[0090] Figure 10 A cross-sectional view of the optical lens of Example 10 of the present invention is shown.

[0091] The above figures include the following reference numerals:

[0092] STO, aperture stop; L1, first lens; S1, first side surface of the first lens; S2, second side surface of the first lens; L2, second lens; S3, first side surface of the second lens; S4, second side surface of the second lens; L3, third lens; S5, first side surface of the third lens; S6, second side surface of the third lens; L4, fourth lens; S7, first side surface of the fourth lens; S8, second side surface of the fourth lens; L5, fifth lens; S9, first side surface of the fifth lens; S10, second side surface of the fifth lens;

[0093] L6, sixth lens; S11, first side surface of the sixth lens; S12, second side surface of the sixth lens; L7, filter; S13, first side surface of the filter; S14, second side surface of the filter; L8, protective glass; S15, first side surface of the protective glass; S16, second side surface of the protective glass; IMA, imaging plane. Detailed Implementation

[0094] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0095] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0096] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0097] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0098] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0099] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object side is called the first side surface of the lens, and the surface of each lens closest to the image side is called the second side surface of the lens. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the first side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the second side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0100] This application generally protects ordinary optical lenses. In the attached drawings, the left side is the object side and the right side is the image side. That is, the first side is the object side and the second side is the image side.

[0101] In an exemplary embodiment, the optical lens provided in this application can be used, for example, as a vehicle-mounted lens. Light rays from the object side can form an image from the image side.

[0102] When the optical lens of this application is applied to a projection lens or a radar transmitting lens, the left side is the imaging side and the right side is the image source side. In an exemplary embodiment, the optical lens provided in this application can be used as, for example, a projection lens or a lidar transmitting lens. In this case, the image side of the optical lens can be the image source side, and the object side can be the imaging side. Light from the image source side can be imaged on the imaging side. The imaging surface of the optical lens is the image source surface.

[0103] In order to solve at least one of the problems in the prior art, such as difficulty in miniaturizing optical lenses, poor imaging quality in dark environments, difficulty in achieving small FNO, and severe ghosting, the present invention provides an optical lens and an electronic device having the same.

[0104] Example 1

[0105] like Figures 1 to 10 As shown, the optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has positive optical power and its first side surface is convex. The second lens has negative optical power and both its first and second side surfaces are concave. The third lens has positive optical power and its second side surface is convex. The fourth lens has positive optical power and its first side surface is convex. The fifth lens has positive optical power, its first side surface is convex, and its second side surface is concave. The sixth lens has positive optical power, its first side surface is convex, and its second side surface is concave.

[0106] By setting the first lens to have positive optical power, it is beneficial for light to converge. By setting the first side of the first lens to be convex, it is possible to collect as much light as possible from a large field of view into the rear optical system, increasing light transmission and improving illumination. At the same time, it is easier to control the aperture of the rear lens, enabling a small-aperture design. In addition, in practical applications, it is beneficial for water droplets to slide off, reducing their impact on imaging.

[0107] Optionally, the second side of the first lens is concave, which can control the direction of large-angle light rays at the edge of the lens, which is conducive to a smooth transition of light and can reduce the sensitivity of the optical lens.

[0108] Of course, the second side of the first lens can also be set to be convex, that is, the shape of the first lens is biconvex and the lens shape is flat, so that the light can enter smoothly into the rear and further make the light path transition smoothly.

[0109] It should be noted that the first lens preferably uses a high refractive index material, which is beneficial for reducing the front aperture and improving the image quality.

[0110] By setting the second lens to a negative optical power, it is beneficial to properly diffuse the light, allowing the light path to smoothly transition to the third lens and the rear optical lens. By making both the first and second sides of the second lens concave, it is beneficial to reduce ghosting caused by BPF (bandpass filter) reflections, thereby improving image quality.

[0111] By setting the third lens to have positive optical power, it is beneficial for light to converge quickly. By setting the second side of the third lens to be convex, the light is further converged and smoothly enters the rear optical system.

[0112] Optionally, the first side of the third lens is concave, which is beneficial for achieving a small FNO in the optical lens when the aperture of the third lens is fixed.

[0113] Of course, the first side of the third lens can also be set to be convex, that is, the shape of the third lens is biconvex, which makes the diverging light rays at the front end converge quickly and is conducive to achieving a small FNO of the optical lens when the aperture of the third lens is fixed.

[0114] By setting the fourth lens to have positive optical power, it is beneficial for light to converge quickly. By setting the first side of the fourth lens to be convex, the light from the large aperture at the front end can be smoothly transferred to the rear optical system.

[0115] Optionally, the second side of the fourth lens is concave, that is, the shape of the fourth lens is crescent-shaped, which is conducive to a smooth transition of light and allows the diverging light to enter smoothly into the rear.

[0116] Of course, the second side of the fourth lens can also be set to be convex, that is, the shape of the fourth lens is biconvex, which can compress the angle of the incident light, achieve a smooth transition of light, allow the diverging light to enter smoothly into the rear, further stabilize the light path, and help reduce the aperture of the rear lens.

[0117] By setting the fifth lens to have positive optical power, it is beneficial for light to converge quickly. By making the first side of the fifth lens convex and the second side concave, that is, by making the fifth lens meniscus, the large-diameter light rays at the front end can quickly and smoothly enter the rear optical system, reducing the back focal length to some extent, and thus reducing the overall length of the optical lens. This also helps to improve image resolution.

[0118] By setting the sixth lens to have positive optical power, it is beneficial for light to converge quickly onto the imaging surface. By setting the first side of the sixth lens to be convex and the second side to be concave, the shape of the sixth lens is approximately a concentric circle, which allows light to converge quickly and smoothly onto the chip surface, further stabilizing the light path.

[0119] In this embodiment, the optical lens also includes an aperture stop, which is located between the fourth lens and the fifth lens. This facilitates a smooth and efficient transition of light entering the optical lens to the rear end of the system, reduces the lens aperture at the rear end of the optical lens, and lowers the assembly sensitivity of the optical lens.

[0120] In this embodiment, the total optical length (TTL), the image height (H) corresponding to the maximum field of view (FOV) of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: TTL / H / FOV ≤ 0.4. Limiting TTL / H / FOV within a reasonable range facilitates reducing the total length of the optical lens while maintaining the same image height and field of view, thus promoting the miniaturization of the optical lens. Preferably, TTL / H / FOV ≤ 0.3.

[0121] In this embodiment, the total optical length (TTL) of the optical lens, the image height (H) corresponding to the maximum field of view (FOV) of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: TTL / H / tan(FOV) ≤ 15. By limiting TTL / H / tan(FOV) within a reasonable range, it is beneficial to reduce the total length of the optical lens while maintaining the same image height and field of view, which is conducive to the miniaturization of the optical lens. Preferably, TTL / H / tan(FOV) ≤ 13.

[0122] In this embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: D / H / θ ≤ 8. By limiting D / H / θ to a reasonable range, it is beneficial to control the front aperture of the optical lens to be relatively small, which is beneficial to the miniaturization of the optical lens. Preferably, D / H / θ ≤ 7.

[0123] In this embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: D / H / FOV ≤ 0.15. Limiting D / H / FOV within a reasonable range helps to control the front aperture of the optical lens to be relatively small, which is beneficial for miniaturization of the optical lens. Preferably, D / H / FOV ≤ 0.13.

[0124] In this embodiment, the overall focal length F of the optical lens, the radian value θ of the maximum field of view of the optical lens, and the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: (F*θ) / D ≥ 0.15. By limiting (F*θ) / D within a reasonable range, the front aperture of the optical lens can be made smaller, reducing the size of the optical lens while ensuring image quality. Preferably, (F*θ) / D ≥ 0.25.

[0125] In this embodiment, the optical back focal length (BFL) and the total optical length (TTL) of the optical lens satisfy the following condition: BFL / TTL ≤ 0.3. By limiting BFL / TTL to a reasonable range, a short back focal length is achieved while maintaining a small field of view (FNO), which is beneficial for module compactness and reduces the overall length of the optical lens. Preferably, BFL / TTL ≤ 0.18.

[0126] In this embodiment, the optical back focal length (BFL) and the lens group length (TL) of the optical lens satisfy the condition: BFL / TL ≤ 0.3. By limiting BFL / TL within a reasonable range, a short back focal length is achieved while maintaining a small field of view (FNO), which is beneficial for module compactness and reduces the overall length of the optical lens. Preferably, BFL / TL ≤ 0.2.

[0127] In this embodiment, the focal lengths F3 and F4 of the third lens and the fourth lens satisfy the condition |F3 / F4| ≤ 1.7. By limiting |F3 / F4| to a reasonable range, the focal lengths of adjacent third and fourth lenses are similar, which avoids the situation where the light path is sharply deflected due to one lens having too small or too large a focal length. This helps the light to transition smoothly and is beneficial to improving image quality. Preferably, |F3 / F4| ≤ 1.5.

[0128] In this embodiment, the sagitta SAG4 of the second side surface of the second lens and the maximum aperture D4 of the second side surface of the second lens corresponding to the maximum field of view of the optical lens satisfy the following condition: arctan(SAG4 / D4) ≥ 2. By limiting arctan(SAG4 / D4) within a reasonable range, the sagitta and aperture of the second side surface of the second lens are controlled, thereby controlling the angle of the surface and improving the ghosting caused by reflections from the color filter and the second side surface of the second lens. Preferably, arctan(SAG4 / D4) ≥ 3.

[0129] In this embodiment, the radius of curvature R7 of the first side surface of the fourth lens and the radius of curvature R8 of the second side surface of the fourth lens satisfy the condition: |R7 / R8|≤2. By limiting |R7 / R8| to a reasonable range, it is beneficial to control the radius of curvature of the first and second sides of the fourth lens, collect more light, and increase the light transmission capability of the system. Preferably, |R7 / R8|≤1.8.

[0130] In this embodiment, the overall focal length F of the optical lens, the radius of curvature R3 of the first side of the second lens, and the radius of curvature R4 of the second side of the second lens satisfy the following condition: 0.6 ≤ |F / R3| + |F / R4| ≤ 1.3. By limiting |F / R3| + |F / R4| to a reasonable range, the radii of curvature of the first and second sides of the second lens are controlled, which helps the light incident from the front-end optical system to smoothly enter the back-end optical system and improves image quality, while reducing the sensitivity of the optical lens. Preferably, 0.8 ≤ |F / R3| + |F / R4| ≤ 1.2.

[0131] In this embodiment, the overall focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the condition: F / ENPD ≤ 1. Limiting F / ENPD within a reasonable range facilitates achieving a small FNO for the optical lens and also increases light transmission. Preferably, F / ENPD ≤ 0.8.

[0132] In this embodiment, the overall focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 1 ≤ F / H ≤ 3. By limiting F / H to a reasonable range, the ratio of focal length to image height is controlled within a certain range, which is beneficial to improving resolution and avoiding excessively exaggerated image height or focal length that could cause abnormalities in the optical lens. Reasonable image height and focal length can improve the imaging quality of the optical lens. Preferably, 1.5 ≤ F / H ≤ 2.4.

[0133] In this embodiment, the overall focal length F of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.5 ≤ (H / 2) / (F*tan(θ / 2)) ≤ 1.5. By limiting (H / 2) / (F*tan(θ / 2)) to a reasonable range, the ratio of the actual image height to the ideal image height is controlled, which is beneficial for achieving large angular resolution. Preferably, 0.8 ≤ (H / 2) / (F*tan(θ / 2)) ≤ 1.2.

[0134] In this embodiment, the total optical length (TTL) of the optical lens and the total focal length (F) of the optical lens satisfy the following condition: TTL / F ≤ 5. Limiting TTL / F within a reasonable range is beneficial for the miniaturization of the optical lens. However, if TTL / F is too small, the system sensitivity will be high; a larger TTL / F is beneficial for adjusting resolution and system sensitivity. Preferably, 3 ≤ TTL / F ≤ 4.2.

[0135] In this embodiment, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy the condition: F1 / F ≥ 1.5. By limiting F1 / F within a reasonable range, the focal length of the first lens is rationally allocated, allowing light to converge, which is beneficial for light with a large field of view to enter the optical system and improve illumination. Preferably, 1.8 ≤ F1 / F ≤ 3.

[0136] In this embodiment, the focal length F2 of the second lens and the total focal length F of the optical lens satisfy the condition: F2 / F ≤ -0.1. By limiting F2 / F within a reasonable range, setting the focal length of the second lens to a negative focal length helps to properly diffuse the light, allowing the light path to smoothly transition to the third lens and the subsequent optical system, which is beneficial for improving resolution. Preferably, -1.5 ≤ F2 / F ≤ -0.6.

[0137] In this embodiment, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy the condition: F3 / F ≥ 1. By limiting F3 / F within a reasonable range and rationally allocating the focal length of the third lens, it is beneficial for light to converge quickly, allowing the diverging light from the front end to enter the rear optical system quickly and smoothly. This also helps to achieve a small FNO for the system when the aperture of the third lens is fixed. Preferably, 2.4 ≤ F3 / F ≤ 6.

[0138] In this embodiment, the focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy the condition: F4 / F ≥ 2. By limiting F4 / F within a reasonable range and rationally allocating the focal length of the fourth lens, it is beneficial for light to converge quickly, allowing the large-aperture light at the front end to smoothly transition to the rear optical system. Preferably, 3.6 ≤ F4 / F ≤ 6.5.

[0139] In this embodiment, the focal length F5 of the fifth lens and the total focal length F of the optical lens satisfy the condition: F5 / F ≥ 1. By limiting F5 / F within a reasonable range and rationally allocating the focal length of the fifth lens, it is beneficial to quickly focus large-angle peripheral light rays entering through the fifth lens, thereby improving image quality. Preferably, 1.5 ≤ F5 / F ≤ 4.

[0140] In this embodiment, the focal length F6 of the sixth lens and the total focal length F of the optical lens satisfy the condition: F6 / F ≥ 2.5. By limiting F6 / F within a reasonable range and rationally allocating the focal length of the sixth lens, it is beneficial for large-angle peripheral light rays entering through the sixth lens to quickly converge to the image plane. Preferably, 3 ≤ F6 / F ≤ 11.

[0141] In this embodiment, the radius of curvature R2 of the second side surface of the first lens and the radius of curvature R3 of the first side surface of the second lens satisfy the following condition: 0.2 ≤ (R2-R3) / (R2+R3) ≤ 2.3. By limiting (R2-R3) / (R2+R3) within a reasonable range, it is ensured that the incident light rays from the first lens are relatively smooth when they enter the first side surface of the second lens, thereby reducing the tolerance sensitivity of the optical lens. Preferably, 0.4 ≤ (R2-R3) / (R2+R3) ≤ 2.

[0142] In this embodiment, the center thickness of the m-th lens on the optical axis is the largest among all the lens center thicknesses of the optical lens, and the center thickness of the n-th lens on the optical axis is the smallest among all the lens center thicknesses of the optical lens. The center thicknesses dm and dn of the m-th lens on the optical axis satisfy the following condition: 0 ≤ dn / dm ≤ 0.8, where m and n are values ​​from 1, 2, 3, 4, 5, and 6. By limiting dn / dm within a reasonable range, the center thicknesses of the first to sixth lenses are similar, which helps to minimize the overall light refraction variation of the optical lens under high and low temperatures and improve its temperature performance. Preferably, 0.1 ≤ dn / dm ≤ 0.6.

[0143] In this embodiment, the distance T23 between the second and third lenses on the optical axis of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: T23 / TTL ≥ 0.08. By limiting T23 / TTL within a reasonable range, controlling the distance T23 is beneficial for system miniaturization. Furthermore, when the third lens can quickly receive light from the second lens, rapid deflection of light within the third lens due to an excessively long T23 can be avoided. Such rapid deflection is detrimental to the system's sensitivity. Therefore, reasonably controlling T23 helps reduce the tolerance sensitivity of the optical lens and also contributes to a small FNO of the optical lens. Preferably, 0.12 ≤ T23 / TTL ≤ 0.2.

[0144] In this embodiment, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the condition: R3 / R4 ≤ -0.1. By limiting R3 / R4 within a reasonable range, the biconcave shape of the second lens facilitates proper light diffusion, allowing the light path to smoothly transition to the third lens and the subsequent optical system. Simultaneously, the second side surface of the second lens is set as concave, and a smaller R value for the second side surface is more beneficial for reducing ghosting caused by BPF reflections. However, the R value cannot be infinitely small, as an excessively small R value is detrimental to the manufacturing of the second lens. Preferably, -0.8 ≤ R3 / R4 ≤ -0.3.

[0145] Example 2

[0146] like Figures 1 to 10 As shown, the optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has positive optical power; the second lens has negative optical power; the third lens has positive optical power; the fourth lens has positive optical power; the fifth lens has positive optical power; and the sixth lens has positive optical power. The radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: R3 / R4≤-0.1.

[0147] Setting the first lens to have a positive optical power facilitates light convergence. Setting the second lens to a negative optical power helps to properly diffuse the light, ensuring a smooth transition of light rays to the third lens and subsequent optical lenses. Setting the third lens to have a positive optical power facilitates rapid light convergence. Setting the fourth lens to have a positive optical power facilitates rapid light convergence. Setting the fifth lens to have a positive optical power facilitates rapid light convergence. Setting the sixth lens to have a positive optical power facilitates rapid light convergence onto the imaging plane.

[0148] By limiting R3 / R4 within a reasonable range, the biconcave shape of the second lens helps to properly diffuse the light, allowing the light path to smoothly transition to the third lens and the rear optical system. At the same time, the second side of the second lens is set as a concave surface. A smaller R value on the second side of the second lens is more conducive to reducing ghosting of BPF reflections. However, the R value cannot be infinitely small, as an R value that is too small is not conducive to the processing of the second lens.

[0149] Preferably, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: -0.8≤R3 / R4≤-0.3.

[0150] By setting the first side of the first lens to be convex, a wider field of view of light can be collected to enter the rear optical system, increasing light transmission and illumination. This also facilitates control over the aperture of the rear lens, enabling a smaller aperture design. Furthermore, in practical applications, it helps water droplets slide off, reducing their impact on imaging. Optionally, the second side of the first lens can be concave, which can control the direction of large-angle light rays at the lens edge, promoting a smoother light transition and reducing the sensitivity of the optical lens. Alternatively, the second side of the first lens can also be convex, meaning the first lens is biconvex with a gently sloping shape, allowing light to enter smoothly into the rear system and further smoothing the light path.

[0151] It should be noted that the first lens preferably uses a high refractive index material, which is beneficial for reducing the front aperture and improving the image quality.

[0152] By setting both the first and second sides of the second lens to be concave, it is beneficial to reduce ghosting caused by BPF (bandpass filter) reflections and improve image quality.

[0153] By setting the second side of the third lens to be convex, light rays are further converged and smoothly enter the rear optical system. Optionally, the first side of the third lens is concave, which is beneficial for achieving a small FNO (field-of-flight) in the optical lens when the aperture of the third lens is fixed. Of course, the first side of the third lens can also be set to be convex, that is, the shape of the third lens is biconvex, which allows the diverging light rays at the front end to converge quickly and is beneficial for achieving a small FNO in the optical lens when the aperture of the third lens is fixed.

[0154] By setting the first side of the fourth lens to be convex, the large-diameter light from the front end smoothly transitions to the rear optical system. Optionally, the second side of the fourth lens is concave, meaning the fourth lens is crescent-shaped, which facilitates a smooth light transition and allows diverging light to smoothly enter the rear. Alternatively, the second side of the fourth lens can be convex, meaning the fourth lens is biconvex, which compresses the angle of the incident light, achieving a smooth light transition and allowing diverging light to smoothly enter the rear, further stabilizing the light path and allowing for a reduction in the aperture of the rear lens.

[0155] By setting the first side of the fifth lens to be convex and the second side to be concave, thus making the fifth lens crescent-shaped, light rays from the large aperture at the front end can enter the rear optical system quickly and smoothly, reducing the back focal length to some extent and consequently reducing the overall length of the optical lens. This also helps improve image resolution.

[0156] By setting the first side of the sixth lens to be convex and the second side to be concave, the shape of the sixth lens is approximately concentric, which allows light to be quickly and smoothly focused onto the chip surface, further stabilizing the light path.

[0157] In this embodiment, the optical lens also includes an aperture stop, which is located between the fourth lens and the fifth lens. This facilitates a smooth and efficient transition of light entering the optical lens to the rear end of the system, reduces the lens aperture at the rear end of the optical lens, and lowers the assembly sensitivity of the optical lens.

[0158] In this embodiment, the total optical length (TTL), the image height (H) corresponding to the maximum field of view (FOV) of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: TTL / H / FOV ≤ 0.4. Limiting TTL / H / FOV within a reasonable range facilitates reducing the total length of the optical lens while maintaining the same image height and field of view, thus promoting the miniaturization of the optical lens. Preferably, TTL / H / FOV ≤ 0.3.

[0159] In this embodiment, the total optical length (TTL) of the optical lens, the image height (H) corresponding to the maximum field of view (FOV) of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: TTL / H / tan(FOV) ≤ 15. By limiting TTL / H / tan(FOV) within a reasonable range, it is beneficial to reduce the total length of the optical lens while maintaining the same image height and field of view, which is conducive to the miniaturization of the optical lens. Preferably, TTL / H / tan(FOV) ≤ 13.

[0160] In this embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: D / H / θ ≤ 8. By limiting D / H / θ to a reasonable range, it is beneficial to control the front aperture of the optical lens to be relatively small, which is beneficial to the miniaturization of the optical lens. Preferably, D / H / θ ≤ 7.

[0161] In this embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: D / H / FOV ≤ 0.15. Limiting D / H / FOV within a reasonable range helps to control the front aperture of the optical lens to be relatively small, which is beneficial for miniaturization of the optical lens. Preferably, D / H / FOV ≤ 0.13.

[0162] In this embodiment, the overall focal length F of the optical lens, the radian value θ of the maximum field of view of the optical lens, and the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: (F*θ) / D ≥ 0.15. By limiting (F*θ) / D within a reasonable range, the front aperture of the optical lens can be made smaller, reducing the size of the optical lens while ensuring image quality. Preferably, (F*θ) / D ≥ 0.25.

[0163] In this embodiment, the optical back focal length (BFL) and the total optical length (TTL) of the optical lens satisfy the following condition: BFL / TTL ≤ 0.3. By limiting BFL / TTL to a reasonable range, a short back focal length is achieved while maintaining a small field of view (FNO), which is beneficial for module compactness and reduces the overall length of the optical lens. Preferably, BFL / TTL ≤ 0.18.

[0164] In this embodiment, the optical back focal length (BFL) and the lens group length (TL) of the optical lens satisfy the condition: BFL / TL ≤ 0.3. By limiting BFL / TL within a reasonable range, a short back focal length is achieved while maintaining a small field of view (FNO), which is beneficial for module compactness and reduces the overall length of the optical lens. Preferably, BFL / TL ≤ 0.2.

[0165] In this embodiment, the focal lengths F3 and F4 of the third lens and the fourth lens satisfy the condition |F3 / F4| ≤ 1.7. By limiting |F3 / F4| to a reasonable range, the focal lengths of adjacent third and fourth lenses are similar, which avoids the situation where the light path is sharply deflected due to one lens having too small or too large a focal length. This helps the light to transition smoothly and is beneficial to improving image quality. Preferably, |F3 / F4| ≤ 1.5.

[0166] In this embodiment, the sagitta SAG4 of the second side surface of the second lens and the maximum aperture D4 of the second side surface of the second lens corresponding to the maximum field of view of the optical lens satisfy the following condition: arctan(SAG4 / D4) ≥ 2. By limiting arctan(SAG4 / D4) within a reasonable range, the sagitta and aperture of the second side surface of the second lens are controlled, thereby controlling the angle of the surface and improving the ghosting caused by reflections from the color filter and the second side surface of the second lens. Preferably, arctan(SAG4 / D4) ≥ 3.

[0167] In this embodiment, the radius of curvature R7 of the first side surface of the fourth lens and the radius of curvature R8 of the second side surface of the fourth lens satisfy the condition: |R7 / R8|≤2. By limiting |R7 / R8| to a reasonable range, it is beneficial to control the radius of curvature of the first and second sides of the fourth lens, collect more light, and increase the light transmission capability of the system. Preferably, |R7 / R8|≤1.8.

[0168] In this embodiment, the overall focal length F of the optical lens, the radius of curvature R3 of the first side of the second lens, and the radius of curvature R4 of the second side of the second lens satisfy the following condition: 0.6 ≤ |F / R3| + |F / R4| ≤ 1.3. By limiting |F / R3| + |F / R4| to a reasonable range, the radii of curvature of the first and second sides of the second lens are controlled, which helps the light incident from the front-end optical system to smoothly enter the back-end optical system and improves image quality, while reducing the sensitivity of the optical lens. Preferably, 0.8 ≤ |F / R3| + |F / R4| ≤ 1.2.

[0169] In this embodiment, the overall focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the condition: F / ENPD ≤ 1. Limiting F / ENPD within a reasonable range facilitates achieving a small FNO for the optical lens and also increases light transmission. Preferably, F / ENPD ≤ 0.8.

[0170] In this embodiment, the overall focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 1 ≤ F / H ≤ 3. By limiting F / H to a reasonable range, the ratio of focal length to image height is controlled within a certain range, which is beneficial to improving resolution and avoiding excessively exaggerated image height or focal length that could cause abnormalities in the optical lens. Reasonable image height and focal length can improve the imaging quality of the optical lens. Preferably, 1.5 ≤ F / H ≤ 2.4.

[0171] In this embodiment, the overall focal length F of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.5 ≤ (H / 2) / (F*tan(θ / 2)) ≤ 1.5. By limiting (H / 2) / (F*tan(θ / 2)) to a reasonable range, the ratio of the actual image height to the ideal image height is controlled, which is beneficial for achieving large angular resolution. Preferably, 0.8 ≤ (H / 2) / (F*tan(θ / 2)) ≤ 1.2.

[0172] In this embodiment, the total optical length (TTL) of the optical lens and the total focal length (F) of the optical lens satisfy the following condition: TTL / F ≤ 5. Limiting TTL / F within a reasonable range is beneficial for the miniaturization of the optical lens. However, if TTL / F is too small, the system sensitivity will be high; a larger TTL / F is beneficial for adjusting resolution and system sensitivity. Preferably, 3 ≤ TTL / F ≤ 4.2.

[0173] In this embodiment, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy the condition: F1 / F ≥ 1.5. By limiting F1 / F within a reasonable range, the focal length of the first lens is rationally allocated, allowing light to converge, which is beneficial for light with a large field of view to enter the optical system and improve illumination. Preferably, 1.8 ≤ F1 / F ≤ 3.

[0174] In this embodiment, the focal length F2 of the second lens and the total focal length F of the optical lens satisfy the condition: F2 / F ≤ -0.1. By limiting F2 / F within a reasonable range, setting the focal length of the second lens to a negative focal length helps to properly diffuse the light, allowing the light path to smoothly transition to the third lens and the subsequent optical system, which is beneficial for improving resolution. Preferably, -1.5 ≤ F2 / F ≤ -0.6.

[0175] In this embodiment, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy the condition: F3 / F ≥ 1. By limiting F3 / F within a reasonable range and rationally allocating the focal length of the third lens, it is beneficial for light to converge quickly, allowing the diverging light from the front end to enter the rear optical system quickly and smoothly. This also helps to achieve a small FNO for the system when the aperture of the third lens is fixed. Preferably, 2.4 ≤ F3 / F ≤ 6.

[0176] In this embodiment, the focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy the condition: F4 / F ≥ 2. By limiting F4 / F within a reasonable range and rationally allocating the focal length of the fourth lens, it is beneficial for light to converge quickly, allowing the large-aperture light at the front end to smoothly transition to the rear optical system. Preferably, 3.6 ≤ F4 / F ≤ 6.5.

[0177] In this embodiment, the focal length F5 of the fifth lens and the total focal length F of the optical lens satisfy the condition: F5 / F ≥ 1. By limiting F5 / F within a reasonable range and rationally allocating the focal length of the fifth lens, it is beneficial to quickly focus large-angle peripheral light rays entering through the fifth lens, thereby improving image quality. Preferably, 1.5 ≤ F5 / F ≤ 4.

[0178] In this embodiment, the focal length F6 of the sixth lens and the total focal length F of the optical lens satisfy the condition: F6 / F ≥ 2.5. By limiting F6 / F within a reasonable range and rationally allocating the focal length of the sixth lens, it is beneficial for large-angle peripheral light rays entering through the sixth lens to quickly converge to the image plane. Preferably, 3 ≤ F6 / F ≤ 11.

[0179] In this embodiment, the radius of curvature R2 of the second side surface of the first lens and the radius of curvature R3 of the first side surface of the second lens satisfy the following condition: 0.2 ≤ (R2-R3) / (R2+R3) ≤ 2.3. By limiting (R2-R3) / (R2+R3) within a reasonable range, it is ensured that the incident light rays from the first lens are relatively smooth when they enter the first side surface of the second lens, thereby reducing the tolerance sensitivity of the optical lens. Preferably, 0.4 ≤ (R2-R3) / (R2+R3) ≤ 2.

[0180] In this embodiment, the center thickness of the m-th lens on the optical axis is the largest among all the lens center thicknesses of the optical lens, and the center thickness of the n-th lens on the optical axis is the smallest among all the lens center thicknesses of the optical lens. The center thicknesses dm and dn of the m-th lens on the optical axis satisfy the following condition: 0 ≤ dn / dm ≤ 0.8, where m and n are values ​​from 1, 2, 3, 4, 5, and 6. By limiting dn / dm within a reasonable range, the center thicknesses of the first to sixth lenses are similar, which helps to minimize the overall light refraction variation of the optical lens under high and low temperatures and improve its temperature performance. Preferably, 0.1 ≤ dn / dm ≤ 0.6.

[0181] In this embodiment, the distance T23 between the second and third lenses on the optical axis of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: T23 / TTL ≥ 0.08. By limiting T23 / TTL within a reasonable range, controlling the distance T23 is beneficial for system miniaturization. Furthermore, when the third lens can quickly receive light from the second lens, rapid deflection of light within the third lens due to an excessively long T23 can be avoided. Such rapid deflection is detrimental to the system's sensitivity. Therefore, reasonably controlling T23 helps reduce the tolerance sensitivity of the optical lens and also contributes to a small FNO of the optical lens. Preferably, 0.12 ≤ T23 / TTL ≤ 0.2.

[0182] It should be noted that the total length TTL of the optical lens is the on-axis distance from the first side of the first lens to the imaging plane of the optical lens, the optical back focal length BFL is the on-axis distance from the last lens to the imaging plane of the optical lens, and the lens group length TL of the optical lens is the on-axis distance from the first side of the first lens to the second side of the last lens.

[0183] Optionally, the aforementioned optical lens may also include a filter for correcting color deviation and a protective glass for protecting the photosensitive element located on the imaging surface.

[0184] In an exemplary embodiment, the first to sixth lenses can all be glass lenses. Optical lenses made of glass can suppress the shift in the back focus of the optical lens due to temperature changes, thereby improving system stability. Simultaneously, using glass avoids lens blurring caused by high and low temperature variations in the operating environment, thus preventing interference with normal lens use. For example, an all-glass optical lens has a wider temperature range, maintaining stable optical performance within the range of -40°C to 105°C. Specifically, when image quality and reliability are of paramount importance, the first to sixth lenses can all be glass lenses. Of course, in applications with lower temperature stability requirements, the first to sixth lenses in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce manufacturing costs. Alternatively, the first to sixth lenses in the optical lens can also be made of a combination of plastic and glass.

[0185] This application also provides an electronic device, including the aforementioned optical lens and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The imaging element may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The electronic device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. This electronic device is equipped with the optical lens described above.

[0186] However, those skilled in the art will understand that the number of lenses constituting the optical lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although six lenses are described as an example in the embodiments, the optical lens is not limited to including six lenses. If necessary, the optical lens may also include other numbers of lenses.

[0187] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical lenses applicable to the above embodiments.

[0188] Example 1

[0189] like Figure 1As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0190] The first lens L1 has positive optical power, with its first side surface S1 being convex and its second side surface S2 being convex. The second lens L2 has negative optical power, with its first side surface S3 being concave and its second side surface S4 being concave. The third lens L3 has positive optical power, with its first side surface S5 being concave and its second side surface S6 being convex. The fourth lens L4 has positive optical power, with its first side surface S7 being convex and its second side surface S8 being convex. The fifth lens L5 has positive optical power, with its first side surface S9 being convex and its second side surface S10 being concave. The sixth lens L6 has positive optical power, with its first side surface S11 being convex and its second side surface S12 being concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0191] In this example, the focal length F of the optical lens is 18.170mm, the total length TTL of the optical lens is 69.282mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0192] Table 1 shows the basic structural parameters of the optical lens in Example 1, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0193] Surf Radius Thickness Nd Vd 0 Infinity Infinity 1 35.9711 7.3321 1.85 23.79 2 -278.2909 4.3458 3 -28.7763 2.6561 1.91 35.26 4 50.2585 10.9797 5 -33.4252 11.7651 1.52 64.20 6 -22.2567 0.1995 7 139.9868 5.2387 1.85 23.79 8 -139.9868 -0.6578 STO Infinity 0.8573 9 22.3918 7.8001 1.90 31.32 10 43.1019 0.1985 11 16.4296 8.2751 1.85 23.79 12 15.8230 3.5249 13 Infinity 1.1000 1.52 54.09 14 Infinity 3.9396 15 Infinity 0.5000 1.52 54.09 16 Infinity 1.2270 IMA Infinity 0.00E+00

[0194] Table 1

[0195] Example 2

[0196] like Figure 2 As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0197] The first lens L1 has positive optical power, with its first side surface S1 being convex and its second side surface S2 being convex. The second lens L2 has negative optical power, with its first side surface S3 being concave and its second side surface S4 being concave. The third lens L3 has positive optical power, with its first side surface S5 being concave and its second side surface S6 being convex. The fourth lens L4 has positive optical power, with its first side surface S7 being convex and its second side surface S8 being convex. The fifth lens L5 has positive optical power, with its first side surface S9 being convex and its second side surface S10 being concave. The sixth lens L6 has positive optical power, with its first side surface S11 being convex and its second side surface S12 being concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0198] In this example, the focal length F of the optical lens is 18.165mm, the total length TTL of the optical lens is 72.626mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0199] Table 2 shows the basic structural parameters of the optical lens in Example 2, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0200]

[0201]

[0202] Table 2

[0203] Example 3

[0204] like Figure 3 As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0205] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is concave. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0206] In this example, the focal length F of the optical lens is 18.210mm, the total length TTL of the optical lens is 68.372mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0207] Table 3 shows the basic structural parameters of the optical lens in Example 3, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0208]

[0209]

[0210] Table 3

[0211] Example 4

[0212] like Figure 4 As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0213] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is concave. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0214] In this example, the focal length F of the optical lens is 18.240mm, the total length TTL of the optical lens is 73.539mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0215] Table 4 shows the basic structural parameters of the optical lens in Example 4, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0216]

[0217]

[0218] Table 4

[0219] Example 5

[0220] like Figure 5 As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0221] The first lens L1 has positive optical power, with its first side surface S1 being convex and its second side surface S2 being convex. The second lens L2 has negative optical power, with its first side surface S3 being concave and its second side surface S4 being concave. The third lens L3 has positive optical power, with its first side surface S5 being concave and its second side surface S6 being convex. The fourth lens L4 has positive optical power, with its first side surface S7 being convex and its second side surface S8 being concave. The fifth lens L5 has positive optical power, with its first side surface S9 being convex and its second side surface S10 being concave. The sixth lens L6 has positive optical power, with its first side surface S11 being convex and its second side surface S12 being concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0222] In this example, the focal length F of the optical lens is 17.890mm, the total length TTL of the optical lens is 67.619mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0223] Table 5 shows the basic structural parameters of the optical lens in Example 5, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0224]

[0225]

[0226] Table 5

[0227] Example 6

[0228] like Figure 6 As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0229] The first lens L1 has positive optical power, with its first side surface S1 being convex and its second side surface S2 being convex. The second lens L2 has negative optical power, with its first side surface S3 being concave and its second side surface S4 being concave. The third lens L3 has positive optical power, with its first side surface S5 being concave and its second side surface S6 being convex. The fourth lens L4 has positive optical power, with its first side surface S7 being convex and its second side surface S8 being concave. The fifth lens L5 has positive optical power, with its first side surface S9 being convex and its second side surface S10 being concave. The sixth lens L6 has positive optical power, with its first side surface S11 being convex and its second side surface S12 being concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0230] In this example, the focal length F of the optical lens is 17.760mm, the total length TTL of the optical lens is 67.498mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0231] Table 6 shows the basic structural parameters of the optical lens in Example 6, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0232]

[0233]

[0234] Table 6

[0235] Example 7

[0236] like Figure 7 As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0237] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is concave. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is concave. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0238] In this example, the focal length F of the optical lens is 18.090mm, the total length TTL of the optical lens is 65.870mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0239] Table 7 shows the basic structural parameters of the optical lens in Example 7, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0240]

[0241]

[0242] Table 7

[0243] Example 8

[0244] like Figure 8 As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0245] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is concave. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is concave. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0246] In this example, the focal length F of the optical lens is 18.140mm, the total length TTL of the optical lens is 66.226mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0247] Table 8 shows the basic structural parameters of the optical lens in Example 8, where the radius of curvature (Radius) and thickness / distance are in millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0248]

[0249]

[0250] Table 8

[0251] Example 9

[0252] like Figure 9 As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0253] The first lens L1 has positive optical power, with its first side surface S1 being convex and its second side surface S2 being convex. The second lens L2 has negative optical power, with its first side surface S3 being concave and its second side surface S4 being concave. The third lens L3 has positive optical power, with its first side surface S5 being convex and its second side surface S6 being convex. The fourth lens L4 has positive optical power, with its first side surface S7 being convex and its second side surface S8 being convex. The fifth lens L5 has positive optical power, with its first side surface S9 being convex and its second side surface S10 being concave. The sixth lens L6 has positive optical power, with its first side surface S11 being convex and its second side surface S12 being concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0254] In this example, the focal length F of the optical lens is 17.950mm, the total length TTL of the optical lens is 67.082mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0255] Table 9 shows the basic structural parameters of the optical lens in Example 9, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0256]

[0257]

[0258] Table 9

[0259] Example 10

[0260] like Figure 10 As shown, the optical lens, from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an imaging surface IMA.

[0261] The first lens L1 has positive optical power, with its first side surface S1 being convex and its second side surface S2 being convex. The second lens L2 has negative optical power, with its first side surface S3 being concave and its second side surface S4 being concave. The third lens L3 has positive optical power, with its first side surface S5 being convex and its second side surface S6 being convex. The fourth lens L4 has positive optical power, with its first side surface S7 being convex and its second side surface S8 being convex. The fifth lens L5 has positive optical power, with its first side surface S9 being convex and its second side surface S10 being concave. The sixth lens L6 has positive optical power, with its first side surface S11 being convex and its second side surface S12 being concave. The filter L7 has its first side surface S13 and its second side surface S14. The protective glass L8 has its first side surface S15 and its second side surface S16. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged onto the imaging surface IMA.

[0262] In this example, the focal length F of the optical lens is 17.869mm, the total length TTL of the optical lens is 66.261mm, and the maximum field of view FOV of the optical lens is 31.700°.

[0263] Table 10 shows the basic structural parameters of the optical lens in Example 10, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm). Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity.

[0264]

[0265]

[0266] Table 10

[0267] In summary, Examples 1 through 15 satisfy the relationships shown in Table 11.

[0268] Conditional / Example 1 2 3 4 5 6 7 8 9 10 TTL / H / FOV 0.235 0.246 0.233 0.250 0.229 0.227 0.223 0.224 0.223 0.218 TTL / H / tan(FOV) 12.044 12.606 11.953 12.820 11.740 11.656 11.468 11.523 11.438 11.211 D / H / θ 6.182 6.368 6.156 6.025 6.171 6.136 6.040 6.060 5.794 5.734 D / H / FOV 0.108 0.111 0.107 0.105 0.108 0.107 0.105 0.106 0.101 0.100 (F*θ) / D 0.316 0.306 0.319 0.326 0.311 0.309 0.322 0.322 0.326 0.326 BFL / TTL 0.149 0.142 0.149 0.139 0.152 0.152 0.158 0.159 0.148 0.149 BFL / TL 0.174 0.165 0.175 0.162 0.179 0.179 0.187 0.189 0.173 0.174 |F3 / F4| 1.113 1.190 1.372 1.185 0.920 0.884 0.871 0.942 0.453 0.441 arctan(SAG4 / D4) 3.807 3.688 4.077 4.243 3.946 3.967 4.151 4.383 3.740 3.608 |R7 / R8| 1.000 1.000 0.738 1.177 0.228 0.349 0.201 0.145 1.267 1.205 |F / R3|+|F / R4| 0.993 0.990 0.992 0.990 1.023 1.015 1.027 1.037 0.958 0.944 F / ENPD 0.713 0.712 0.714 0.715 0.702 0.696 0.709 0.711 0.704 0.701 F / H 1.951 1.947 1.966 1.964 1.918 1.894 1.945 1.949 1.890 1.867 (H / 2) / (F*tan(θ / 2)) 0.903 0.904 0.896 0.897 0.918 0.930 0.905 0.903 0.932 0.943 TTL / F 3.813 3.998 3.755 4.032 3.780 3.801 3.641 3.651 3.737 3.708 F1 / F 2.219 2.181 2.335 2.426 2.268 2.286 2.321 2.625 2.462 2.488 F2 / F -1.135 -1.117 -1.134 -1.140 -1.101 -1.109 -1.096 -1.086 -1.159 -1.179 F3 / F 5.414 5.636 5.513 5.124 4.614 4.528 4.413 4.460 2.764 2.667 F4 / F 4.865 4.738 4.017 4.324 5.017 5.119 5.067 4.736 6.108 6.048 F5 / F 2.531 2.602 2.996 3.006 2.584 2.657 2.473 2.277 2.569 2.705 F6 / F 5.843 6.109 3.964 4.004 4.727 4.377 4.362 5.604 10.662 9.829 (R2-R3) / (R2+R3) 0.813 0.583 1.265 1.788 0.818 0.816 1.187 1.635 0.916 0.905 dn / dm 0.226 0.484 0.274 0.215 0.248 0.248 0.275 0.277 0.405 0.452 T23 / TTL 0.158 0.158 0.160 0.149 0.154 0.153 0.154 0.144 0.168 0.169 R3 / R4 -0.573 -0.531 -0.614 -0.663 -0.548 -0.549 -0.576 -0.616 -0.520 -0.502

[0269] Table 11

[0270] Table 12 gives the complete set of focal length values ​​F for the optical lenses of Examples 1 to 10, and the focal length values ​​F1 to F6 (unit: mm) for each lens.

[0271]

[0272]

[0273] Table 12

[0274] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0275] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0276] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0277] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical lens, characterized in that, The optical lens has six lenses with optical power, including: A first lens, the first lens having positive optical power, and the first side surface of the first lens being a convex surface; The second lens has negative optical power, and both the first side surface and the second side surface of the second lens are concave. The third lens has positive optical power, and the second side surface of the third lens is convex. The fourth lens has positive optical power, and the first side surface of the fourth lens is convex. The fifth lens has positive optical power, the first side surface of the fifth lens is convex, and the second side surface of the fifth lens is concave. The sixth lens has positive optical power, the first side surface of the sixth lens is convex, and the second side surface of the sixth lens is concave. The total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 11.211≤TTL / H / tan(FOV)≤15.

2. The optical lens according to claim 1, characterized in that, The second side surface of the first lens is concave.

3. The optical lens according to claim 1, characterized in that, The second side surface of the first lens is convex.

4. The optical lens according to claim 1, characterized in that, The first side surface of the third lens is concave.

5. The optical lens according to claim 1, characterized in that, The first side surface of the third lens is convex.

6. The optical lens according to claim 1, characterized in that, The second side surface of the fourth lens is concave.

7. The optical lens according to claim 1, characterized in that, The second side surface of the fourth lens is convex.

8. The optical lens according to claim 1, characterized in that, The optical lens also includes an aperture stop, which is located between the fourth lens and the fifth lens.

9. The optical lens according to any one of claims 1 to 8, characterized in that, The total optical length (TTL) of the optical lens, the image height (H) corresponding to the maximum field of view (FOV) of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: TTL / H / FOV≤0.

4.

10. The optical lens according to any one of claims 1 to 8, characterized in that, The maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 5.734≤D / H / θ≤8.

11. The optical lens according to any one of claims 1 to 8, characterized in that, The maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: D / H / FOV≤0.

15.

12. The optical lens according to any one of claims 1 to 8, characterized in that, The total focal length F of the optical lens, the radian value θ of the maximum field of view of the optical lens, and the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.326≥(F*θ) / D≥0.

15.

13. The optical lens according to any one of claims 1 to 8, characterized in that, The optical back focal length (BFL) and the optical total length (TTL) of the optical lens satisfy the following condition: 0.139 ≤ BFL / TTL ≤ 0.

3.

14. The optical lens according to any one of claims 1 to 8, characterized in that, The optical back focal length (BFL) of the optical lens and the lens group length (TL) of the optical lens satisfy the following condition: 0.162 ≤ BFL / TL ≤ 0.

3.

15. The optical lens according to any one of claims 1 to 8, characterized in that, The focal length F3 of the third lens and the focal length F4 of the fourth lens satisfy the following condition: |F3 / F4|≤1.

7.

16. The optical lens according to any one of claims 1 to 8, characterized in that, The sagitta SAG4 of the second side of the second lens and the maximum aperture D4 of the second side of the second lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 4.383≥arctan(SAG4 / D4)≥2.

17. The optical lens according to any one of claims 1 to 8, characterized in that, The radius of curvature R7 of the first side surface of the fourth lens and the radius of curvature R8 of the second side surface of the fourth lens satisfy the following condition: |R7 / R8|≤2.

18. The optical lens according to any one of claims 1 to 8, characterized in that, The total focal length F of the optical lens, the radius of curvature R3 of the first side of the second lens, and the radius of curvature R4 of the second side of the second lens satisfy the following condition: 0.6≤|F / R3|+|F / R4|≤1.

3.

19. The optical lens according to any one of claims 1 to 8, characterized in that, The total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following condition: 0.696≤F / ENPD≤1.

20. The optical lens according to any one of claims 1 to 8, characterized in that, The total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: 1≤F / H≤3.

21. The optical lens according to any one of claims 1 to 8, characterized in that, The total focal length F of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.5≤(H / 2) / (F*tan(θ / 2))≤1.

5.

22. The optical lens according to any one of claims 1 to 8, characterized in that, The total optical length (TTL) of the optical lens and the total focal length (F) of the optical lens satisfy the following condition: 3 ≤ TTL / F ≤ 5.

23. The optical lens according to any one of claims 1 to 8, characterized in that, The focal length F1 of the first lens and the total focal length F of the optical lens satisfy the following condition: 3≥F1 / F≥1.

5.

24. The optical lens according to any one of claims 1 to 8, characterized in that, The focal length F2 of the second lens and the total focal length F of the optical lens satisfy the following condition: -1.5≤F2 / F≤-0.

1.

25. The optical lens according to any one of claims 1 to 8, characterized in that, The focal length F3 of the third lens and the total focal length F of the optical lens satisfy the following condition: 6≥F3 / F≥1.

26. The optical lens according to any one of claims 1 to 8, characterized in that, The focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy the following condition: 6.5 ≥ F4 / F ≥ 2.

27. The optical lens according to any one of claims 1 to 8, characterized in that, The focal length F5 of the fifth lens and the total focal length F of the optical lens satisfy the following condition: 4≥F5 / F≥1.

28. The optical lens according to any one of claims 1 to 8, characterized in that, The focal length F6 of the sixth lens and the total focal length F of the optical lens satisfy the following condition: 11≥F6 / F≥2.

5.

29. The optical lens according to any one of claims 1 to 8, characterized in that, The radius of curvature R2 of the second side surface of the first lens and the radius of curvature R3 of the first side surface of the second lens satisfy the following condition: 0.2≤(R2-R3) / (R2+R3)≤2.

3.

30. The optical lens according to any one of claims 1 to 8, characterized in that, The center thickness of the m-th lens on the optical axis of the optical lens is the largest among all the center thicknesses of the lenses in the optical lens, and the center thickness of the n-th lens on the optical axis is the smallest among all the center thicknesses of the lenses in the optical lens. The center thickness dm of the m-th lens on the optical axis and the center thickness dn of the n-th lens on the optical axis satisfy the following condition: 0 ≤ dn / dm ≤ 0.8, where m and n take values ​​from 1, 2, 3, 4, 5, 6.

31. The optical lens according to any one of claims 1 to 8, characterized in that, The distance T23 between the second lens and the third lens on the optical axis of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: 0.2≥T23 / TTL≥0.

08.

32. The optical lens according to any one of claims 1 to 8, characterized in that, The radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: -0.8≤R3 / R4≤-0.

1.

33. The optical lens according to any one of claims 1 to 8, characterized in that, The following conditions must be met: 0.218≤TTL / H / FOV≤0.3, 11.211≤TTL / H / tan(FOV)≤13, 5.734≤D / H / θ≤7, 0.10≤D / H / FOV≤0.13, 0.326≥(F*θ) / D≥0.25, 0.139≤BFL / TTL≤0.18, 0.162≤BFL / TL≤0.2, 0.441≤|F3 / F4|≤1.5, 4.383≥arctan(SAG4 / D4)≥3, 0.145≤|R7 / R8|≤1.8, 0.8≤|F / R3|+ |F / R4|≤1.2, 0.696≤F / ENPD≤0.8, 1.5≤F / H≤2.4, 0.8≤(H / 2) / (F*tan(θ / 2))≤1.2, 3≤TTL / F≤4.2, 1.8≤F1 / F≤3, -1.5≤F2 / F≤-0.6, 2.4 ≤F3 / F≤6, 3.6≤F4 / F≤6.5, 1.5≤F5 / F≤4, 3≤F6 / F≤11, 0.4≤(R2-R3) / (R2+R3)≤2, 0.1≤dn / dm≤0.6, 0.12≤T23 / TTL≤0.2, -0.8≤R3 / R4≤-0.3, including the following parameters: the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, the maximum field of view FOV of the optical lens, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the radian value θ of the maximum field of view of the optical lens, the total focal length F of the optical lens, the optical back focal length BFL of the optical lens, the lens group length TL of the optical lens, the focal length F3 of the third lens, the focal length F4 of the fourth lens, the sagitta SAG4 of the second side of the second lens, the maximum aperture D4 of the second side of the second lens corresponding to the maximum field of view of the optical lens, the radius of curvature R7 of the first side of the fourth lens, the radius of curvature R8 of the second side of the fourth lens, and the first side of the second lens. The radius of curvature R3 of the surface, the radius of curvature R4 of the second side surface of the second lens, the entrance pupil diameter ENPD of the optical lens, the focal length F1 of the first lens, the focal length F2 of the second lens, the focal length F5 of the fifth lens, the focal length F6 of the sixth lens, the radius of curvature R2 of the second side surface of the first lens, the distance T23 between the second lens and the third lens on the optical axis of the optical lens, the center thickness dm of the m-th lens on the optical axis, and the center thickness dn of the n-th lens on the optical axis, wherein the center thickness of the m-th lens on the optical axis of the optical lens is the largest among all the center thicknesses of the lenses in the optical lens, and the center thickness of the n-th lens on the optical axis of the optical lens is the smallest among all the center thicknesses of the lenses in the optical lens, and m and n are taken from 1, 2, 3, 4, 5, 6.

34. The optical lens according to any one of claims 1 to 8, characterized in that, The following conditions must be met: 0.218≤TTL / H / FOV≤0.25, 11.211≤TTL / H / tan(FOV)≤12.82, 5.734≤D / H / θ≤6.368, 0.10≤D / H / FOV≤0.111, 0.326≥(F*θ) / D≥0.306, 0.139≤BFL / TTL≤0.159, 0.162≤BFL / TL≤0.189, 0.441≤|F3 / F4|≤1.372, 4.383≥arctan(SAG4 / D4)≥3.608, 0.145≤|R7 / R8|≤1.267, 0.944≤|F / R3|+|F / R4|≤1.037, 0.696≤F / E NPD≤0.715, 1.867≤F / H≤1.966, 0.896≤(H / 2) / (F*tan(θ / 2))≤0.943, 3.641≤TT L / F≤4.032, 2.625≥F1 / F≥2.181, -1.179≤F2 / F≤-1.086, 5.636≥F3 / F≥2.667, 6.1 08≥F4 / F≥4.017, 3.006≥F5 / F≥2.277, 10.662≥F6 / F≥3.964, 0.583≤(R2-R3) / (R 2+R3)≤1.788, 0.215≤dn / dm≤0.484, 0.169≥T23 / TTL≥0.144, -0.663≤R3 / R4≤-0.502, including the following parameters: the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, the maximum field of view FOV of the optical lens, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the radian value θ of the maximum field of view of the optical lens, the total focal length F of the optical lens, the optical back focal length BFL of the optical lens, the lens group length TL of the optical lens, the focal length F3 of the third lens, the focal length F4 of the fourth lens, the sagitta SAG4 of the second side of the second lens, the maximum aperture D4 of the second side of the second lens corresponding to the maximum field of view of the optical lens, the radius of curvature R7 of the first side of the fourth lens, the radius of curvature R8 of the second side of the fourth lens, and the first... The following parameters are considered: the radius of curvature R3 of the side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, the entrance pupil diameter ENPD of the optical lens, the focal length F1 of the first lens, the focal length F2 of the second lens, the focal length F5 of the fifth lens, the focal length F6 of the sixth lens, the radius of curvature R2 of the second side surface of the first lens, the distance T23 between the second and third lenses on the optical axis of the optical lens, the center thickness dm of the m-th lens on the optical axis, and the center thickness dn of the n-th lens on the optical axis, wherein the center thickness of the m-th lens on the optical axis is the largest among all the center thicknesses of the lenses in the optical lens, and the center thickness of the n-th lens on the optical axis is the smallest among all the center thicknesses of the lenses in the optical lens, and m and n are taken from 1, 2, 3, 4, 5, 6.

35. An electronic device, characterized in that, It includes an optical lens as described in any one of claims 1 to 34 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images