Optical lenses and electronic devices

Abstract

This invention provides an optical lens and an electronic device. The optical lens includes: a first lens with negative optical power, wherein a first side surface of the first lens is convex and a second side surface is concave; a second lens with negative optical power, wherein a second side surface of the second lens is concave; a third lens with positive optical power, wherein a second side surface of the third lens is convex; a fourth lens with optical power, wherein a first side surface of the fourth lens is convex and a second side surface is concave; a fifth lens with optical power; a sixth lens with optical power; a seventh lens with optical power, wherein a first side surface of the seventh lens is convex; an eighth lens with optical power, wherein a second side surface of the eighth lens is convex; and a ninth lens with negative optical power, wherein a first side surface of the ninth lens is convex and a second side surface is concave. This invention solves the problem in existing optical lenses that it is difficult to simultaneously achieve small aperture, high resolution, low distortion, high light transmission, large aperture, and high relative illumination.

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. Background Technology

[0002] With the continuous development of technology, the application fields of optical lenses have gradually covered various industries, such as machine vision monitoring, portable products, and automotive driver assistance systems. The development of optical lenses in each field mainly depends on changes in user needs. Taking the application of optical lenses in the field of automotive driver assistance systems as an example, with the rapid development of automotive driver assistance systems, optical lenses have been widely used in automobiles. These include in-vehicle reversing camera systems, dashcams, automatic parking and panoramic parking systems, and road navigation systems. In-vehicle lenses are key components for acquiring external information in autonomous driving assistance systems. With the rapid development of autonomous driving assistance systems, the performance requirements for forward-looking optical lenses are also increasing, moving towards higher resolution, larger field of view, and lower distortion. At the same time, as autonomous driving increasingly demands higher nighttime driving capabilities, the requirements for night vision functions in in-vehicle lenses are also becoming more stringent.

[0003] Existing technologies offer several optical lenses for automotive applications, but they generally suffer from several problems, such as: inability to simultaneously meet the requirements of high resolution and miniaturization; or, although the optical lenses can achieve megapixel clarity, they suffer from severe aberrations such as chromatic aberration, astigmatism, and distortion; or, poor light transmission capabilities, making them unsuitable for dark environments such as nighttime or rainy days; some cannot simultaneously meet the requirements of small front aperture and miniaturization; and others cannot simultaneously meet the requirements of large aperture and high resolution.

[0004] In other words, existing optical lenses suffer from the problem of not being able to simultaneously achieve small aperture, high resolution, low distortion, high light throughput, large aperture, and high relative illumination. Summary of the Invention

[0005] The main objective of this invention is to provide an optical lens and an electronic device to solve the problem that existing optical lenses cannot simultaneously achieve small aperture, high resolution, low distortion, high light transmission, large aperture and high relative illumination.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical lens is provided, comprising, from a first side to a second side, the following components in sequence: a first lens having negative optical power, wherein a first side surface of the first lens is convex and a second side surface is concave; a second lens having negative optical power, wherein a second side surface of the second lens is concave; a third lens having positive optical power, wherein a second side surface of the third lens is convex; a fourth lens having optical power, wherein a first side surface of the fourth lens is convex and a second side surface is concave; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having optical power, wherein a first side surface of the seventh lens is convex; an eighth lens having optical power, wherein a second side surface of the eighth lens is convex; and a ninth lens having negative optical power, wherein a first side surface of the ninth lens is convex and a second side surface is concave.

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

[0008] Furthermore, the first side surface of the second lens is convex.

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

[0010] Furthermore, the first side surface of the third lens is convex.

[0011] Furthermore, the fourth lens has positive optical power.

[0012] Furthermore, the fourth lens has negative optical power.

[0013] Furthermore, the fifth lens has negative optical power, and its first side surface is convex while its second side surface is concave.

[0014] Furthermore, the fifth lens has negative optical power, and the first side surface of the fifth lens is concave, and the second side surface is concave.

[0015] Furthermore, the fifth lens has positive optical power, and both its first and second sides are convex.

[0016] Furthermore, the sixth lens has positive optical power, and the first side surface of the sixth lens is convex, and the second side surface is convex.

[0017] Furthermore, the sixth lens has negative optical power, and the first side surface of the sixth lens is concave, and the second side surface is concave.

[0018] Furthermore, the seventh lens has positive optical power, and the second side surface of the seventh lens is convex.

[0019] Furthermore, the seventh lens has negative optical power, and the second side surface of the seventh lens is concave.

[0020] Furthermore, the eighth lens has positive optical power, and the first side surface of the eighth lens is convex.

[0021] Furthermore, the eighth lens has negative optical power, and the first side surface of the eighth lens is concave.

[0022] Furthermore, the fifth and sixth lenses are cemented together to form a cemented doublet, and the seventh and eighth lenses are cemented together to form a cemented doublet.

[0023] Furthermore, the optical lens also includes an aperture stop, which is positioned between the sixth and seventh lenses.

[0024] Furthermore, the first side surface of the second lens is provided with recurve, and / or the first side surface of the ninth lens is provided with recurve.

[0025] Furthermore, both the second and ninth lenses are aspherical lenses.

[0026] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: BFL / TTL≥0.01.

[0027] 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 corresponding to the maximum field of view of the optical lens satisfy the following relationship: D / H / θ≤3.

[0028] 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 total focal length F of the optical lens satisfy the following relationship: D / H / F≤3.

[0029] Furthermore, the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfies the following relationship with the total focal length F of the optical lens: 6≤TTL / F≤30.

[0030] 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: 0.01≤R7 / R8≤5.

[0031] Furthermore, the radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.01≤(R1-R2) / (R1+R2)≤0.85.

[0032] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens satisfy the following relationship: |(HF×θ) / (F×θ)|≤0.5.

[0033] Furthermore, the entrance pupil diameter ENPD of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: ENPD / H≥0.01.

[0034] Furthermore, the focal length F9 of the ninth lens satisfies the following relationship with the total focal length F of the optical lens: F9 / F≤-0.01.

[0035] 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 condition: 0.01≤F / H≤1.

[0036] Furthermore, the angle subtended by the second side of the first lens, arctan(1 / K(S2)), satisfies: arctan(1 / K(S2))≥35°.

[0037] Furthermore, the radius of curvature R8 of the second side of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: R8 / F≥0.01.

[0038] Furthermore, the focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: |F6 / F|≥0.01.

[0039] Furthermore, the sagitta SAG1 of the first side surface of the first lens and the sagitta SAG2 of the second side surface of the first lens satisfy the following condition: 0.05≤|SAG2 / SAG1|.

[0040] Furthermore, the radius of curvature R15 of the first side of the eighth lens satisfies the following relationship with the total focal length F of the optical lens: R15 / F≤5.

[0041] Furthermore, the focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the following condition: |F7 / F8|≤8.

[0042] Furthermore, the distance d4 between the second lens and the third lens satisfies the following condition with respect to the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane of the optical lens: d4 / TTL≥0.125.

[0043] Furthermore, the focal length F2 of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: -5≤F2 / R4≤-0.1.

[0044] According to another aspect of the present invention, an optical lens is provided, comprising, from a first side to a second side, the following in sequence: a first lens having negative optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having optical power; an eighth lens having optical power; and a ninth lens having negative optical power; wherein the radius of curvature R8 of the second side surface of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: R8 / F ≥ 0.01.

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

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

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

[0048] Furthermore, the first side of the third lens is concave, and the second side is convex.

[0049] Furthermore, the first side surface of the third lens is convex, and the second side surface is convex.

[0050] Furthermore, the fourth lens has positive optical power, and the first side of the fourth lens is convex and the second side is concave.

[0051] Furthermore, the fourth lens has negative optical power, and its first side surface is convex while its second side surface is concave.

[0052] Furthermore, the fifth lens has negative optical power, and its first side surface is convex while its second side surface is concave.

[0053] Furthermore, the fifth lens has negative optical power, and the first side surface of the fifth lens is concave, and the second side surface is concave.

[0054] Furthermore, the fifth lens has positive optical power, and both its first and second sides are convex.

[0055] Furthermore, the sixth lens has positive optical power, and the first side surface of the sixth lens is convex, and the second side surface is convex.

[0056] Furthermore, the sixth lens has negative optical power, and the first side surface of the sixth lens is concave, and the second side surface is concave.

[0057] Furthermore, the seventh lens has positive optical power, and both its first and second sides are convex.

[0058] Furthermore, the seventh lens has negative optical power, and its first side surface is convex while its second side surface is concave.

[0059] Furthermore, the eighth lens has positive optical power, and the first side surface of the eighth lens is convex, and the second side surface is convex.

[0060] Furthermore, the eighth lens has negative optical power, and the first side of the eighth lens is concave and the second side is convex.

[0061] Furthermore, the first side surface of the ninth lens is convex, and the second side surface is concave.

[0062] Furthermore, the fifth and sixth lenses are cemented together to form a cemented doublet, and the seventh and eighth lenses are cemented together to form a cemented doublet.

[0063] Furthermore, the optical lens also includes an aperture stop, which is positioned between the sixth and seventh lenses.

[0064] Furthermore, the first side surface of the second lens is provided with recurve, and / or the first side surface of the ninth lens is provided with recurve.

[0065] Furthermore, both the second and ninth lenses are aspherical lenses.

[0066] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: BFL / TTL≥0.01.

[0067] 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 corresponding to the maximum field of view of the optical lens satisfy the following relationship: D / H / θ≤3.

[0068] 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 total focal length F of the optical lens satisfy the following relationship: D / H / F≤3.

[0069] Furthermore, the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfies the following relationship with the total focal length F of the optical lens: 6≤TTL / F≤30.

[0070] 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: 0.01≤R7 / R8≤5.

[0071] Furthermore, the radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.01≤(R1-R2) / (R1+R2)≤0.85.

[0072] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens satisfy the following relationship: |(HF×θ) / (F×θ)|≤0.5.

[0073] Furthermore, the entrance pupil diameter ENPD of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: ENPD / H≥0.01.

[0074] Furthermore, the focal length F9 of the ninth lens satisfies the following relationship with the total focal length F of the optical lens: F9 / F≤-0.01.

[0075] 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 condition: 0.01≤F / H≤1.

[0076] Furthermore, the angle subtended by the second side of the first lens, arctan(1 / K(S2)), satisfies: arctan(1 / K(S2))≥35°.

[0077] Furthermore, the focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: |F6 / F|≥0.01.

[0078] Furthermore, the sagitta SAG1 of the first side surface of the first lens and the sagitta SAG2 of the second side surface of the first lens satisfy the following condition: 0.05≤|SAG2 / SAG1|.

[0079] Furthermore, the radius of curvature R15 of the first side of the eighth lens satisfies the following relationship with the total focal length F of the optical lens: R15 / F≤5.

[0080] Furthermore, the focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the following condition: |F7 / F8|≤8.

[0081] Furthermore, the distance d4 between the second lens and the third lens satisfies the following condition with respect to the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane of the optical lens: d4 / TTL≥0.125.

[0082] Furthermore, the focal length F2 of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: -5≤F2 / R4≤-0.1.

[0083] According to another aspect of the present invention, an electronic device is provided, including the aforementioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0084] According to the technical solution of this invention, the optical lens sequentially includes, from the first side to the second side: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with optical power, a fifth lens with optical power, a sixth lens with optical power, a seventh lens with optical power, an eighth lens with optical power, and a ninth lens with negative optical power. The first side of the first lens is convex and the second side is concave; the second side of the second lens is concave; the second side of the third lens is convex; the first side of the fourth lens is convex and the second side is concave; the first side of the seventh lens is convex; the second side of the eighth lens is convex; and the first side of the ninth lens is convex and the second side is concave.

[0085] The first lens has negative optical power, and its first side is convex while its second side is concave. The negative focal length and meniscus shape of the first lens maximize the collection of light from a wide field of view into the rear optical system, increasing light transmission and illumination. Simultaneously, the smooth light transition reduces system sensitivity. The first lens is preferably made of a high-refractive-index material, which facilitates a smaller front aperture. The convex design of the first side helps control the aperture of the rear lens, enabling miniaturization.

[0086] The second lens has negative optical power, and its second side surface is concave. The first side surface of the second lens can be either convex or concave. When the first side surface of the second lens is concave, it has negative optical power and diverges light rays, separating the central and peripheral rays of each field of view. This increases the aperture diameter and system illumination, while also facilitating the correction of aberrations between the central and peripheral rays, achieving high resolution. Under the same field of view, the light emitted from the second side surface of the first lens provides a larger light-receiving surface for subsequent optical systems, allowing for a larger aperture and greater light intake, thus increasing image brightness. Simultaneously, the concave first side surface of the second lens, combined with the concave second side surface of the first lens, ensures a smooth transition of light rays to the first side surface of the third lens, reducing light loss and improving illumination in the peripheral field of view. It also alters the trajectory of peripheral rays, reducing the front aperture of the optical lens, thus minimizing its size and contributing to miniaturization and cost reduction. When the first side of the second lens is convex, the second lens has negative optical power and diverges light. Under the same field of view, the light emitted from the second side of the second lens can provide a larger light receiving surface for the subsequent optical system. At the same time, the convex shape towards the first side causes a significant light reversal when the light enters the second lens, changing the trend of large-angle light. Meanwhile, the convexity of the first side of the second lens, combined with the concave surface of the second side of the first lens, allows the light emitted from the second lens to smoothly enter the first side of the third lens, which is conducive to a smooth light transition, reduces light energy loss, improves the illumination of the peripheral field of view, and changes the trend of edge light, thereby reducing the front diameter of the lens, reducing the size, and facilitating miniaturization and cost reduction.

[0087] The third lens has positive optical power, and its second side is convex. The first side of the third lens can be either convex or concave. When the first side of the third lens is concave, it has positive optical power and converges light rays. This positive power lens, when paired with the second lens, helps light enter the rear lens smoothly, improving resolution. Simultaneously, the concave first side of the third lens, combined with the concave second side of the second lens, alters the trajectory of peripheral light rays, reducing the front aperture and overall size, thus contributing to miniaturization and cost reduction. Conversely, when the first side of the third lens is convex, it also has positive optical power and converges light rays. When paired with the negative power second lens, it helps light enter the rear lens smoothly, improving resolution. Furthermore, the convex first side of the third lens, combined with the concave second side of the second lens, alters the trajectory of peripheral light rays, reducing the front aperture and overall size, thus contributing to miniaturization and cost reduction.

[0088] The fourth lens has a convex first side and a concave second side. Its optical power can be positive or negative. When the fourth lens has a negative optical power, it has a flat shape and its convex first side compresses the angle of the incident light, allowing for a smooth transition and facilitating the smooth flow of diverging light. This further reduces the aperture of the rear lens. When the fourth lens has a convex first side and a concave second side, the light reaches the second side almost perpendicularly, resulting in minimal light deflection and energy loss, while also reducing lens sensitivity. When the fourth lens has a positive optical power, it is a convex glass spherical surface that collects light rays entering through the third lens. The positive optical power helps to converge the light appropriately, resulting in a smooth transition. Furthermore, the significant difference in shape between the second and first sides of the third and fourth lenses significantly alters the light path. With the same fourth lens aperture, this allows for a reduction in the front aperture and miniaturization of the optical lens.

[0089] The optical power of the fifth lens can be positive or negative. When the optical power of the fifth lens is negative, it has a negative optical power, causing light to be incident almost perpendicularly on the second side of the fifth lens. The light transition is smooth, resulting in fewer aberrations, which is beneficial for achieving high resolution and improving the resolving capability of the optical system. At the same time, the fifth lens also has a diverging effect on light, which is beneficial for correcting aberrations between peripheral and central rays, achieving high resolution. When the optical power of the fifth lens is positive, it can further converge the light rays that have passed through the fourth lens, making the light rays from the fourth lens flow more smoothly after passing through the fifth lens.

[0090] The optical power of the sixth lens can be positive or negative. When the optical power of the sixth lens is positive, it can compress the angle of the incident light, achieving a smooth transition of light rays and allowing diverging light rays to smoothly enter the rear, further smoothing the light path and helping to reduce the aperture of the rear lens. When the optical power of the sixth lens is negative, it has a diverging effect on the light rays, causing the light rays that have converged through the fourth and fifth lenses to diverge appropriately, resulting in a smooth transition of light rays and smaller aberrations.

[0091] The first side of the seventh lens is convex, and its optical power can be positive or negative. The second side of the fifth lens can be either convex or concave. When the seventh lens has positive optical power and its second side is convex, it has positive optical power and converges light rays. Combined with the front aperture to converge the light, this reduces the rear aperture, which is beneficial for miniaturization. Simultaneously, both sides of the seventh lens are convex, which, combined with the concave first side of the eighth lens, allows the light to travel smoothly within the cemented doublet, correcting chromatic aberration while improving resolution. When the seventh lens has negative optical power and its second side is concave, it has negative optical power and appropriately diffuses the light converged by the sixth lens, resulting in a smoother light transition. The convex first side and concave second side of the seventh lens result in a larger deflection angle for light rays from the edge of the field of view, which helps collect more light rays from the edge of the field of view and improves the system's relative illumination.

[0092] The second side of the eighth lens is convex. The optical power of the eighth lens can be positive or negative, and the first side of the eighth lens can be convex or concave. When the eighth lens has a positive optical power and its first side is convex, it converges the light rays diffused by the seventh lens, resulting in a smooth light transition and reduced sensitivity. Both sides of the eighth lens are convex, making the exit angle and incident angle of the light rays close, resulting in a gentle light path and almost perpendicular light emission, which helps improve resolution. When the eighth lens has a negative optical power and its first side is concave, it appropriately diffuses the light rays converged by the seventh lens, resulting in a gentle light path within the cemented doublet lens. The concave first side and convex second side of the eighth lens increase the optical path of the peripheral field of view rays, making the distinction from the central field of view rays more obvious, which also helps improve resolution.

[0093] The ninth lens has negative optical power, and its first side surface is convex while its second side surface is concave. The ninth lens is preferably aspherical, with negative optical power and a convex-concave shape, allowing as many large-angle peripheral rays as possible to smoothly transition to the rear optical system, correcting astigmatism and field curvature, and improving the resolving power of the optical system.

[0094] This application employs nine lenses. By optimizing the optical power and surface shape of each lens, the optical lens of this invention has at least one beneficial effect, such as small aperture, high resolution, low sensitivity, low distortion, high light transmission, large aperture, and high relative illumination. Attached Figure Description

[0095] 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:

[0096] Figure 1 A schematic diagram of the structure of an optical lens of Example 1 of the present invention is shown;

[0097] Figure 2 A schematic diagram of the structure of the optical lens of Example 2 of the present invention is shown;

[0098] Figure 3 A schematic diagram of the structure of the optical lens of Example 3 of the present invention is shown;

[0099] Figure 4 A schematic diagram of the structure of the optical lens of Example 4 of the present invention is shown;

[0100] Figure 5 A schematic diagram of the structure of the optical lens of Example 5 of the present invention is shown;

[0101] Figure 6 A schematic diagram of the structure of the optical lens of Example Six of the present invention is shown;

[0102] Figure 7 A schematic diagram of the structure of the optical lens of Example Seven of the present invention is shown;

[0103] Figure 8 A schematic diagram of the structure of the optical lens of Example 8 of the present invention is shown;

[0104] Figure 9 A schematic diagram of the structure of the optical lens of Example 9 of the present invention is shown;

[0105] Figure 10 A schematic diagram of the structure of the optical lens of Example 10 of the present invention is shown;

[0106] Figure 11 A schematic diagram of the structure of the optical lens of Example Eleven of the present invention is shown;

[0107] Figure 12 A schematic diagram of the structure of the optical lens of Example Twelve of the present invention is shown;

[0108] Figure 13 A schematic diagram of the structure of the optical lens of Example Thirteen of the present invention is shown;

[0109] Figure 14 A schematic diagram of the structure of the optical lens of Example Fourteen of the present invention is shown.

[0110] The above figures include the following reference numerals:

[0111] 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; L6, Sixth lens; S10, First side surface of the sixth lens; S11, Second side surface of the sixth lens; STO, Aperture stop; L7, Seventh lens; S13, First side surface of the seventh lens; S14, Second side surface of the seventh lens; L8, Eighth lens; S14, First side surface of the eighth lens; S15, Second side surface of the eighth lens; L9, Ninth lens; S16, First side surface of the ninth lens; S17, Second side surface of the ninth lens; S18, First side surface of the protective glass; S19, Second side surface of the protective glass; IMA, Imaging plane. Detailed Implementation

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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 first side is called the first side surface of the lens, and the surface of each lens closest to the second 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 known 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.

[0118] It should be noted that the left side of the optical lens is the first side, and the right side of the optical lens is the second side.

[0119] In an exemplary embodiment, the optical lens provided in this application can be used as a vehicle-mounted lens. For a vehicle-mounted lens, the left side is the object side and the right side is the image side; the first side is also the object side, and the second side is also the image side.

[0120] In an exemplary embodiment, the optical lens provided in this application can be used as, for example, a projection lens or a lidar transmitter lens.

[0121] To address the problem that existing optical lenses cannot simultaneously achieve small aperture, high resolution, low distortion, high light throughput, large aperture, and high relative illumination, this invention provides an optical lens and an electronic device.

[0122] Example 1

[0123] like Figures 1 to 14 As shown, the optical lens, from the first side to the second side, includes, in sequence: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with optical power, a fifth lens with optical power, a sixth lens with optical power, a seventh lens with optical power, an eighth lens with optical power, and a ninth lens with negative optical power. The first side of the first lens is convex and the second side is concave; the second side of the second lens is concave; the second side of the third lens is convex; the first side of the fourth lens is convex and the second side is concave; the first side of the seventh lens is convex; the second side of the eighth lens is convex; and the first side of the ninth lens is convex and the second side is concave.

[0124] The first lens has negative optical power, and its first side is convex while its second side is concave. The negative focal length and meniscus shape of the first lens maximize the collection of light from a wide field of view into the rear optical system, increasing light transmission and illumination. Simultaneously, the smooth light transition reduces system sensitivity. The first lens is preferably made of a high-refractive-index material, which facilitates a smaller front aperture. The convex design of the first side helps control the aperture of the rear lens, enabling miniaturization.

[0125] The second lens has negative optical power, and its second side surface is concave. The first side surface of the second lens can be either convex or concave. When the first side surface of the second lens is concave, it has negative optical power and diverges light rays, separating the central and peripheral rays of each field of view. This increases the aperture diameter and system illumination, while also facilitating the correction of aberrations between the central and peripheral rays, achieving high resolution. Under the same field of view, the light emitted from the second side surface of the first lens provides a larger light-receiving surface for subsequent optical systems, allowing for a larger aperture and greater light intake, thus increasing image brightness. Simultaneously, the concave first side surface of the second lens, combined with the concave second side surface of the first lens, ensures a smooth transition of light rays to the first side surface of the third lens, reducing light loss and improving illumination in the peripheral field of view. It also alters the trajectory of peripheral rays, reducing the front aperture of the optical lens, thus minimizing its size and contributing to miniaturization and cost reduction. When the first side of the second lens is convex, the second lens has negative optical power and diverges light. Under the same field of view, the light emitted from the second side of the second lens can provide a larger light receiving surface for the subsequent optical system. At the same time, the convex shape towards the first side causes a significant light reversal when the light enters the second lens, changing the trend of large-angle light. Meanwhile, the convexity of the first side of the second lens, combined with the concave surface of the second side of the first lens, allows the light emitted from the second lens to smoothly enter the first side of the third lens, which is conducive to a smooth light transition, reduces light energy loss, improves the illumination of the peripheral field of view, and changes the trend of edge light, thereby reducing the front diameter of the lens, reducing the size, and facilitating miniaturization and cost reduction.

[0126] The third lens has positive optical power, and its second side is convex. The first side of the third lens can be either convex or concave. When the first side of the third lens is concave, it has positive optical power and converges light rays. This positive power lens, when paired with the second lens, helps light enter the rear lens smoothly, improving resolution. Simultaneously, the concave first side of the third lens, combined with the concave second side of the second lens, alters the trajectory of peripheral light rays, reducing the front aperture and overall size, thus contributing to miniaturization and cost reduction. Conversely, when the first side of the third lens is convex, it also has positive optical power and converges light rays. When paired with the negative power second lens, it helps light enter the rear lens smoothly, improving resolution. Furthermore, the convex first side of the third lens, combined with the concave second side of the second lens, alters the trajectory of peripheral light rays, reducing the front aperture and overall size, thus contributing to miniaturization and cost reduction.

[0127] The fourth lens has a convex first side and a concave second side. Its optical power can be positive or negative. When the fourth lens has a negative optical power, it has a flat shape and its convex first side compresses the angle of the incident light, allowing for a smooth transition and facilitating the smooth flow of diverging light. This further reduces the aperture of the rear lens. When the fourth lens has a convex first side and a concave second side, the light reaches the second side almost perpendicularly, resulting in minimal light deflection and energy loss, while also reducing lens sensitivity. When the fourth lens has a positive optical power, it is a convex glass spherical surface that collects light rays entering through the third lens. The positive optical power helps to converge the light appropriately, resulting in a smooth transition. Furthermore, the significant difference in shape between the second and first sides of the third and fourth lenses significantly alters the light path. With the same fourth lens aperture, this allows for a reduction in the front aperture and miniaturization of the optical lens.

[0128] The optical power of the fifth lens can be positive or negative. When the optical power of the fifth lens is negative, it has a negative optical power, causing light to be incident almost perpendicularly on the second side of the fifth lens. The light transition is smooth, resulting in fewer aberrations, which is beneficial for achieving high resolution and improving the resolving capability of the optical system. At the same time, the fifth lens also has a diverging effect on light, which is beneficial for correcting aberrations between peripheral and central rays, achieving high resolution. When the optical power of the fifth lens is positive, it can further converge the light rays that have passed through the fourth lens, making the light rays from the fourth lens flow more smoothly after passing through the fifth lens.

[0129] The optical power of the sixth lens can be positive or negative. When the optical power of the sixth lens is positive, it can compress the angle of the incident light, achieving a smooth transition of light rays and allowing diverging light rays to smoothly enter the rear, further smoothing the light path and helping to reduce the aperture of the rear lens. When the optical power of the sixth lens is negative, it has a diverging effect on the light rays, causing the light rays that have converged through the fourth and fifth lenses to diverge appropriately, resulting in a smooth transition of light rays and smaller aberrations.

[0130] The first side of the seventh lens is convex, and its optical power can be positive or negative. The second side of the fifth lens can be either convex or concave. When the seventh lens has positive optical power and its second side is convex, it has positive optical power and converges light rays. Combined with the front aperture to converge the light, this reduces the rear aperture, which is beneficial for miniaturization. Simultaneously, both sides of the seventh lens are convex, which, combined with the concave first side of the eighth lens, allows the light to travel smoothly within the cemented doublet, correcting chromatic aberration while improving resolution. When the seventh lens has negative optical power and its second side is concave, it has negative optical power and appropriately diffuses the light converged by the sixth lens, resulting in a smoother light transition. The convex first side and concave second side of the seventh lens result in a larger deflection angle for light rays from the edge of the field of view, which helps collect more light rays from the edge of the field of view and improves the system's relative illumination.

[0131] The second side of the eighth lens is convex. The optical power of the eighth lens can be positive or negative, and the first side of the eighth lens can be convex or concave. When the eighth lens has a positive optical power and its first side is convex, it converges the light rays diffused by the seventh lens, resulting in a smooth light transition and reduced sensitivity. Both sides of the eighth lens are convex, making the exit angle and incident angle of the light rays close, resulting in a gentle light path and almost perpendicular light emission, which helps improve resolution. When the eighth lens has a negative optical power and its first side is concave, it appropriately diffuses the light rays converged by the seventh lens, resulting in a gentle light path within the cemented doublet lens. The concave first side and convex second side of the eighth lens increase the optical path of the peripheral field of view rays, making the distinction from the central field of view rays more obvious, which also helps improve resolution.

[0132] The ninth lens has negative optical power, and its first side surface is convex while its second side surface is concave. The ninth lens is preferably aspherical, with negative optical power and a convex-concave shape, allowing as many large-angle peripheral rays as possible to smoothly transition to the rear optical system, correcting astigmatism and field curvature, and improving the resolving power of the optical system.

[0133] This application employs nine lenses. By optimizing the optical power and surface shape of each lens, the optical lens of this invention has at least one beneficial effect, such as small aperture, high resolution, low sensitivity, low distortion, high light transmission, large aperture, and high relative illumination.

[0134] In this embodiment, the first side surface of the second lens is concave. The second lens has negative optical power and diverges light, which can disperse the central and peripheral rays of each field of view, enlarge the aperture, increase the system illumination, and facilitate the correction of aberrations between the central and peripheral rays to achieve high resolution. Under the same field of view, the light emitted from the second side surface of the first lens can provide a larger light receiving surface for the subsequent optical system, enabling a larger physical aperture of the aperture, a larger aperture ring, and a greater amount of light intake, thus increasing the brightness of the image plane. At the same time, the concave nature of the first side surface of the second lens, in conjunction with the concave nature of the second side surface of the first lens, allows the light emitted from the second lens to smoothly enter the first side surface of the third lens, which facilitates a smooth light transition, reduces light energy loss, improves the illumination of the peripheral field of view, and changes the trend of peripheral rays, thereby reducing the front aperture of the optical lens, reducing its size, and contributing to miniaturization and cost reduction.

[0135] In this embodiment, the first side surface of the second lens is convex. The second lens has negative optical power and diverges light. Under the same field of view, the light emitted from the second side surface of the second lens can provide a larger light receiving surface for the subsequent optical system. At the same time, the convex shape towards the first side causes a significant light reversal when the light enters the second lens, changing the trend of large-angle light. Meanwhile, the convexity of the first side surface of the second lens, combined with the concave surface of the second side surface of the first lens, allows the light emitted from the second lens to smoothly enter the first side surface of the third lens, which facilitates a smooth light transition, reduces light energy loss, improves the illumination of the peripheral field of view, and changes the trend of edge light rays. This allows for a reduction in the front diameter of the lens, reducing its size and contributing to miniaturization and cost reduction.

[0136] In this embodiment, the first side surface of the third lens is concave. The third lens has positive optical power and converges light rays. The positive optical power lens, combined with the second lens, facilitates the smooth entry of light rays into the rear lens, improving resolution. At the same time, the concave first side surface of the third lens, in conjunction with the concave second side surface of the second lens, changes the trajectory of edge light rays, thereby reducing the front aperture and volume, which is beneficial for miniaturization and cost reduction.

[0137] In this embodiment, the first side surface of the third lens is convex. The third lens has positive optical power and converges light rays. Combined with the negative optical power of the second lens, it facilitates the smooth entry of light rays into the rear lens, improving resolution. At the same time, the convexity of the first side surface of the third lens, in conjunction with the concave surface of the second side surface of the second lens, changes the trajectory of edge light rays, thereby reducing the front aperture and volume, which is beneficial for miniaturization and cost reduction.

[0138] In this embodiment, the fourth lens has positive optical power. The fourth lens is a glass spherical surface convex to the first side, which collects the light entering through the third lens. Positive optical power helps to properly converge the light and make the light path transition smoothly. In addition, the second side of the third lens and the first side of the fourth lens have significantly different shapes, and the fourth lens significantly changes the light path. With the same aperture of the fourth lens, the purpose of reducing the front aperture of the optical lens and miniaturizing it can be achieved.

[0139] In this embodiment, the fourth lens has negative optical power. The fourth lens has negative optical power and a gently sloping shape. Its first side is convex, which compresses the angle of the incident light, achieving a smooth transition and allowing diverging light to smoothly enter the rear, further smoothing the light path and facilitating a reduction in the aperture of the rear lens. The first side of the fourth lens is convex, and the second side is concave. When light reaches the second side, it is almost perpendicularly incident, resulting in minimal light deflection and energy loss, while also reducing the lens's sensitivity.

[0140] In this embodiment, the fifth lens has negative optical power, with a convex first side and a concave second side. The negative optical power of the fifth lens ensures that light rays are incident almost perpendicularly onto its second side, resulting in a smooth light transition, minimal aberrations, and improved high resolution, thus enhancing the resolving power of the optical system. The convex first side of the fifth lens collects light rays entering through the fourth lens, facilitating light convergence. Furthermore, the significant shape difference between the second side of the fourth lens and the first side of the fifth lens allows the fifth lens to significantly alter the light trajectory, enabling a reduction in the front aperture and miniaturization of the optical lens.

[0141] In this embodiment, the fifth lens has negative optical power, and both its first and second sides are concave. The negative optical power of the fifth lens diverges light rays, which is beneficial for correcting aberrations between peripheral and central rays, thus achieving high resolution. Simultaneously, the concave nature of the first side of the fifth lens, combined with the concave nature of the second side of the fourth lens, facilitates a smoother light transition, reducing light loss and improving illumination in the peripheral field of view. Furthermore, it alters the trajectory of peripheral rays, contributing to miniaturization and cost reduction.

[0142] In this embodiment, the fifth lens has positive optical power, and both its first and second sides are convex. The positive optical power of the fifth lens further converges the light rays passing through the fourth lens. The convex first side of the fifth lens, combined with the concave second side of the fourth lens, allows the light rays to travel more smoothly after passing through the fourth lens, reducing light loss and improving the illumination of the surrounding field of view.

[0143] In this embodiment, the sixth lens has positive optical power, and both its first and second sides are convex. The sixth lens has positive optical power and a gently sloping shape. The convex first side of the sixth lens compresses the angle of the incident light, achieving a smooth transition and allowing diverging light to smoothly enter the rear, further smoothing the light path and facilitating a reduction in the aperture of the rear lens. Furthermore, the significant difference in shape between the second side of the fifth lens and the first side of the sixth lens results in a noticeable change in the light path by the sixth lens; with the same aperture of the sixth lens, the front aperture can be reduced, achieving miniaturization.

[0144] In this embodiment, the sixth lens has negative optical power, and both its first and second sides are concave. The negative optical power of the sixth lens diverges light rays, allowing the light rays converged by the fourth and fifth lenses to diverge appropriately, resulting in a smoother transition and fewer aberrations. Simultaneously, the concave nature of both sides ensures that light rays from the edge field of view have a longer optical path than those from the center field of view after passing through the sixth lens. This alters the trajectory of the light rays from the edge field of view, making them more concentrated upon reaching the imaging plane. This defocusing correction of edge field of view aberrations achieves high resolution.

[0145] In this embodiment, the seventh lens has positive optical power, and its second side surface is convex. The positive optical power of the seventh lens converges light rays, and when combined with the front aperture to further reduce light beams, it reduces the rear aperture, which is beneficial for miniaturization. Simultaneously, the convexity of both sides of the seventh lens, combined with the concave surface of the first side surface of the eighth lens, allows light to travel smoothly within the cemented doublet, correcting chromatic aberration while improving resolution.

[0146] In this embodiment, the seventh lens has negative optical power, and its second side is concave. The negative optical power of the seventh lens allows it to appropriately diffuse the light converged by the sixth lens, promoting a smoother light transition. The first side of the seventh lens is convex, and the second side is concave, resulting in a larger deflection angle for light rays from the edge of the field of view. This helps to collect more light rays from the edge of the field of view and improve the relative illumination of the system.

[0147] In this embodiment, the eighth lens has positive optical power, and its first side surface is convex. The positive optical power of the eighth lens allows it to converge light rays diffused by the seventh lens, resulting in a smooth light transition and reduced sensitivity. The convexity of both sides of the eighth lens ensures that the exit angle and incident angle of the light rays are close, resulting in a gentle light path and almost perpendicular light emission, which helps improve resolution.

[0148] In this embodiment, the eighth lens has negative optical power, and its first side surface is concave. The negative optical power of the eighth lens allows it to appropriately diffuse the light converged by the seventh lens, resulting in a smoother light path within the cemented doublet lens. The concave first side and convex second side of the eighth lens increase the optical path of the edge field of view rays, making them more clearly distinguishable from the central field of view rays, thus improving resolution.

[0149] In this embodiment, the fifth and sixth lenses are cemented together to form a cemented doublet, and the seventh and eighth lenses are cemented together to form another cemented doublet. By using cemented doublets, light rays from the front lens can be smoothly transitioned to the rear optical system, reducing the overall length of the optical lens. This allows for sufficient correction of various aberrations in the optical system, improving resolution and optimizing optical performance such as distortion and CRA while maintaining a compact structure. Using cemented doublets reduces the air gap between the two lenses, decreasing the overall system length; the complementary dispersion of the two lenses in a cemented doublet helps reduce chromatic aberration and improve image quality; it also reduces the number of assembly components between the two lenses, simplifying processes and lowering costs; furthermore, it reduces field curvature, which can correct off-axis point aberrations. It also allows for reasonable focal length allocation, facilitating thermal compensation and achieving good temperature performance.

[0150] In this embodiment, the optical lens also includes an aperture stop, which is disposed between the sixth lens and the seventh lens. The aperture stop's placement between the sixth and seventh lenses facilitates effective light convergence entering the optical system, reduces the lens aperture at the rear of the optical system, and lowers the system's assembly sensitivity.

[0151] In this embodiment, the first side surface of the second lens is inverted, and / or the first side surface of the ninth lens is inverted. Inverting the surface helps to balance aberrations and improve resolution.

[0152] In this embodiment, both the second and ninth lenses are aspherical lenses. Using two aspherical lenses is beneficial for correcting system aberrations and improving resolution.

[0153] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane of the optical lens, and the optical back focal length, i.e., the distance BFL from the center of the second side surface of the last lens to the center of the imaging plane, satisfy the condition: BFL / TTL ≥ 0.01. Satisfying this condition meets the special requirements for the back focal length of the optical lens and also provides space for the installation and focusing of optical components, avoiding mechanical interference. Preferably, BFL / TTL ≥ 0.1.

[0154] 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 corresponding to the maximum field of view of the optical lens satisfy the condition: D / H / θ≤3. Satisfying this condition allows the optical lens to have a large target surface and a small aperture under a fixed focal length. Preferably, D / H / θ≤2.

[0155] 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 total focal length F of the optical lens satisfy the condition: D / H / F≤3. Satisfying this condition, under the condition of a fixed focal length, provides the optical lens with the characteristics of a large target surface and a small aperture. Preferably, D / H / F≤1.

[0156] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 6 ≤ TTL / F ≤ 30. If TTL / F is too small, the system sensitivity will be high; if TTL / F is large, it is beneficial for resolution and system sensitivity. Therefore, considering cost, miniaturization, system resolution, and sensitivity protection, a range is considered. Preferably, 8.5 ≤ TTL / F ≤ 15.

[0157] 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: 0.01 ≤ R7 / R8 ≤ 5. By rationally configuring the radius of curvature of the fourth lens, the light collected by the third lens is compressed, resulting in a relatively smooth light path and a stable transition of light to the rear. This effectively reduces system aberrations and improves system imaging quality. If the value is below the lower limit of the condition, the incident angle of the light rays incident on the first side surface of the fourth lens increases, leading to a decrease in relative illumination. Therefore, satisfying this condition allows for the acquisition of a high-quality, bright image. Preferably, 0.1 ≤ R7 / R8 ≤ 3.

[0158] In this embodiment, the radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the condition: 0.01 ≤ (R1-R2) / (R1+R2) ≤ 0.85. Satisfying this condition corrects aberrations in the optical system and ensures that when light rays exiting the first lens are incident on the first side surface of the second lens, the incident light is relatively smooth, thereby reducing the tolerance sensitivity of the optical system. Preferably, 0.1 ≤ (R1-R2) / (R1+R2) ≤ 0.6.

[0159] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens satisfy the following condition: |(HF×θ) / (F×θ)|≤0.5. This ensures that increasing the focal length of the optical lens, while keeping the field of view and image plane size constant, enhances the imaging effect in the central region of the image plane. Preferably, |(HF×θ) / (F×θ)|≤0.25.

[0160] In this embodiment, the entrance pupil diameter ENPD of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: ENPD / H ≥ 0.01. While ensuring that the field of view and image plane size of the optical lens remain unchanged, a larger entrance pupil diameter is beneficial for increasing light transmission and improving relative illumination. Preferably, ENPD / H ≥ 0.1.

[0161] In this embodiment, the focal length F9 of the ninth lens satisfies the condition F9 / F ≤ -0.01 with the total focal length F of the optical lens. By rationally allocating the focal length of the ninth lens, light can enter the optical system smoothly, which is beneficial for light collection, ensuring light transmission, and improving resolution. Preferably, F9 / F ≤ -0.1.

[0162] In this embodiment, 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: 0.01 ≤ F / H ≤ 1. By controlling the focal length and image height within a certain range, it is beneficial to improve resolution. Preferably, 0.1 ≤ F / H ≤ 0.8.

[0163] In this embodiment, the angle subtended by the second side of the first lens, arctan(1 / K(S2)), satisfies: arctan(1 / K(S2)) ≥ 35°. A larger angle subtended by the second side of the first lens facilitates rapid focusing of large-angle peripheral light rays entering through the first lens, thus improving image quality. Preferably, arctan(1 / K(S2)) ≥ 50°.

[0164] In this embodiment, the radius of curvature R8 of the second side surface of the fourth lens and the focal length F of the entire optical lens satisfy the condition: R8 / F ≥ 0.01. When the ratio of the radius of curvature of the second side surface of the fourth lens to the focal length is within a controlled range, it can help smooth the light path, especially the light at the edge of the field of view, which can better correct aberrations, improve image quality, and achieve high resolution. Preferably, R8 / F ≥ 0.1.

[0165] In this embodiment, the focal length F6 of the sixth lens satisfies the condition |F6 / F|≥0.01 with the overall focal length F of the optical lens. Properly allocating the focal length of the sixth lens allows light to enter the rear optical system smoothly, while also improving light collection, ensuring sufficient light transmission, and enhancing resolution. Preferably, |F6 / F|≥0.1.

[0166] In this embodiment, the sagitta SAG1 of the first side surface of the first lens and the sagitta SAG2 of the second side surface of the first lens satisfy the condition: 0.05 ≤ |SAG2 / SAG1|. The significant difference in the sagitta R between the two sides of the first lens is beneficial for light collection, allowing for a smooth transition of light to the rear, and effectively reducing system aberrations and improving system imaging quality. Preferably, 0.5 ≤ |SAG2 / SAG1|.

[0167] In this embodiment, the radius of curvature R15 of the first side surface of the eighth lens satisfies the condition R15 / F ≤ 5 with respect to the overall focal length F of the optical lens. Through the reasonable configuration of the radius of curvature of the object side surface of the eighth lens, the light path is made relatively gentle, thus allowing the light to smoothly transition to the rear. This effectively reduces system aberrations and improves the system's imaging quality. Preferably, R15 / F ≤ 3.

[0168] In this embodiment, the focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the condition |F7 / F8|≤8. By setting the focal lengths of the two lenses in the cemented doublet to be similar, it is beneficial to correct chromatic aberration and improve image quality. Preferably, |F7 / F8|≤6.5.

[0169] In this embodiment, the distance d4 between the second and third lenses satisfies the following condition with respect to the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane of the optical lens: d4 / TTL ≥ 0.125. The second and third lenses account for a large proportion of the overall weight of the optical lens. Properly setting the distance between the second and third lenses helps to center the center of gravity of the entire system, effectively reducing system sensitivity. Preferably, d4 / TTL ≥ 0.15.

[0170] In this embodiment, the focal length F2 of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following relationship: -5 ≤ F2 / R4 ≤ -0.1. By appropriately matching the focal length and radius of curvature of the second side surface, and considering that the second side surface of the second lens is concave, controlling the second lens to have a negative optical power is beneficial for collecting light rays entering through the first lens, preventing excessive divergence of light rays from the first side, and facilitating control of the aperture of the rear lens. The combination of the second and first lenses, with two meniscus lenses of the same negative optical power in the same direction, results in a smoother outgoing light beam, which is beneficial for achieving low distortion. Preferably, -2.5 ≤ F2 / R4 ≤ -1.

[0171] Example 2

[0172] like Figures 1 to 14 As shown, the optical lens, from the first side to the second side, sequentially includes: a first lens with negative optical power; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with optical power; a fifth lens with optical power; a sixth lens with optical power; a seventh lens with optical power; an eighth lens with optical power; and a ninth lens with negative optical power. The radius of curvature R8 of the second side of the fourth lens satisfies the following relationship with the focal length F of the entire optical lens: R8 / F ≥ 0.01. When the ratio of the radius of curvature of the second side of the fourth lens to the focal length is within a controlled range, it can help smooth the light path, especially the light at the edge of the field of view, better correct aberrations, improve image quality, and achieve high resolution. Preferably, R8 / F ≥ 0.1.

[0173] In this embodiment, the first side of the first lens is convex, and the second side is concave. The first lens has a negative focal length and is designed in a meniscus shape to collect as much light as possible from a wide field of view into the rear optical system, increasing light transmission and illumination. Simultaneously, it allows for a smoother light transition, reducing system sensitivity. The first lens is preferably made of a high-refractive-index material, which facilitates a smaller front aperture. Furthermore, the convex design of the first side helps control the aperture of the rear lens, enabling a miniaturized design.

[0174] In this embodiment, both the first and second sides of the second lens are concave. The second lens has negative optical power and diverges light, separating the central and peripheral rays of each field of view, thus enlarging the aperture and increasing system illumination. It also facilitates the correction of aberrations between the central and peripheral rays, achieving high resolution. Under the same field of view, the light emitted from the second side of the first lens provides a larger light-receiving surface for the subsequent optical system, allowing for a larger aperture and greater light intake, thus increasing image brightness. Simultaneously, the concave nature of the first side of the second lens, combined with the concave nature of the second side of the first lens, ensures a smooth transition of light to the first side of the third lens, reducing light loss and improving illumination in the peripheral field of view. Furthermore, it alters the trajectory of peripheral rays, reducing the front aperture of the optical lens, thus minimizing its size and contributing to miniaturization and cost reduction.

[0175] In this embodiment, the first side surface of the second lens is convex, and the second side surface is concave. The second lens has negative optical power and diverges light. Under the same field of view, the light emitted from the second side surface of the second lens can provide a larger light receiving surface for the subsequent optical system. At the same time, the convex shape towards the first side causes a significant light reversal when the light enters the second lens, changing the trend of large-angle light. Meanwhile, the convexity of the first side surface of the second lens, combined with the concave surface of the second side surface of the first lens, allows the light emitted from the second lens to smoothly enter the first side surface of the third lens, which facilitates a smooth light transition, reduces light energy loss, improves the illumination of the peripheral field of view, and changes the trend of edge light rays. This allows for a reduction in the front aperture of the lens, reducing its size and contributing to miniaturization and cost reduction.

[0176] In this embodiment, the first side of the third lens is concave, and the second side is convex. The third lens has positive optical power and converges light rays. The positive optical power lens, combined with the second lens, facilitates the smooth entry of light rays into the rear lens, improving resolution. At the same time, the concave first side of the third lens, in conjunction with the concave second side of the second lens, alters the trajectory of edge light rays, reducing the front aperture and volume, which is beneficial for miniaturization and cost reduction.

[0177] In this embodiment, the first side surface of the third lens is convex, and the second side surface is also convex. The third lens has positive optical power and converges light rays. Combined with the negative optical power of the second lens, it facilitates the smooth entry of light rays into the rear lens, improving resolution. At the same time, the convexity of the first side surface of the third lens, in conjunction with the concaveness of the second side surface of the second lens, changes the trajectory of edge light rays, thereby reducing the front aperture and volume, which is beneficial for miniaturization and cost reduction.

[0178] In this embodiment, the fourth lens has positive optical power, with its first side being convex and its second side being concave. When the optical power of the fourth lens is positive, it is a glass spherical surface convex towards the first side, collecting light rays entering through the third lens. Positive optical power helps to properly converge the light rays, resulting in a smooth transition in the light path. Furthermore, the significant difference in shape between the second side of the third lens and the first side of the fourth lens leads to a noticeable change in the light path. With the same aperture of the fourth lens, the goal of reducing and miniaturizing the front aperture of the optical lens can be achieved.

[0179] In this embodiment, the fourth lens has a negative optical power, with a convex first side and a concave second side. When the optical power of the fourth lens is negative, it has a flat shape and the convex first side compresses the angle of the incident light, allowing for a smooth transition and facilitating the smooth flow of diverging light into the rear. This further reduces the aperture of the rear lens. The convex first side and concave second side ensure that light rays are almost perpendicularly incident when they reach the second side, resulting in minimal light deflection and energy loss, while also reducing lens sensitivity.

[0180] In this embodiment, the fifth lens has negative optical power, with a convex first side and a concave second side. The negative optical power of the fifth lens ensures that light rays are incident almost perpendicularly onto its second side, resulting in a smooth light transition, minimal aberrations, and improved high resolution, thus enhancing the resolving power of the optical system. The convex first side of the fifth lens collects light rays entering through the fourth lens, facilitating light convergence. Furthermore, the significant shape difference between the second side of the fourth lens and the first side of the fifth lens allows the fifth lens to significantly alter the light trajectory, enabling a reduction in the front aperture and miniaturization of the optical lens.

[0181] In this embodiment, the fifth lens has negative optical power, and both its first and second sides are concave. The negative optical power of the fifth lens diverges light rays, which is beneficial for correcting aberrations between peripheral and central rays, thus achieving high resolution. Simultaneously, the concave nature of the first side of the fifth lens, combined with the concave nature of the second side of the fourth lens, facilitates a smoother light transition, reducing light loss and improving illumination in the peripheral field of view. Furthermore, it alters the trajectory of peripheral rays, contributing to miniaturization and cost reduction.

[0182] In this embodiment, the fifth lens has positive optical power, and both its first and second sides are convex. The positive optical power of the fifth lens further converges the light rays passing through the fourth lens. The convex first side of the fifth lens, combined with the concave second side of the fourth lens, allows the light rays to travel more smoothly after passing through the fourth lens, reducing light loss and improving the illumination of the surrounding field of view.

[0183] In this embodiment, the sixth lens has positive optical power, and both its first and second sides are convex. The sixth lens has positive optical power and a gently sloping shape. The convex first side of the sixth lens compresses the angle of the incident light, achieving a smooth transition and allowing diverging light to smoothly enter the rear, further smoothing the light path and facilitating a reduction in the aperture of the rear lens. Furthermore, the significant difference in shape between the second side of the fifth lens and the first side of the sixth lens results in a noticeable change in the light path by the sixth lens; with the same aperture of the sixth lens, the front aperture can be reduced, achieving miniaturization.

[0184] In this embodiment, the sixth lens has negative optical power, and both its first and second sides are concave. The negative optical power of the sixth lens diverges light rays, allowing the light rays converged by the fourth and fifth lenses to diverge appropriately, resulting in a smoother transition and fewer aberrations. Simultaneously, the concave nature of both sides ensures that light rays from the edge field of view have a longer optical path than those from the center field of view after passing through the sixth lens. This alters the trajectory of the light rays from the edge field of view, making them more concentrated upon reaching the imaging plane. This defocusing correction of edge field of view aberrations achieves high resolution.

[0185] In this embodiment, the seventh lens has positive optical power, and both its first and second sides are convex. The positive optical power of the seventh lens converges light rays, and when combined with the front aperture to further reduce light beams, it reduces the rear aperture, which is beneficial for miniaturization. Furthermore, the convexity of both sides of the seventh lens, combined with the concave surface of the first side of the eighth lens, allows light to travel smoothly within the cemented doublet, correcting chromatic aberration while improving resolution.

[0186] In this embodiment, the seventh lens has negative optical power, with a convex first side and a concave second side. The negative optical power of the seventh lens allows it to appropriately diffuse the light converged by the sixth lens, promoting a smoother light transition. The convex first side and concave second side of the seventh lens result in a larger deflection angle for light rays from the edge of the field of view, which helps to collect more light rays from the edge of the field of view and improve the relative illumination of the system.

[0187] In this embodiment, the eighth lens has positive optical power, and both its first and second sides are convex. The positive optical power of the eighth lens allows it to converge light rays diffused by the seventh lens, resulting in a smooth light transition and reduced sensitivity. The convexity of both sides of the eighth lens ensures that the exit angle and incident angle of the light rays are close, resulting in a gentle light path and almost perpendicular light emission, which helps improve resolution.

[0188] In this embodiment, the eighth lens has negative optical power, with a concave first side and a convex second side. The negative optical power of the eighth lens appropriately diffuses the light converged by the seventh lens, resulting in a smoother light path within the cemented doublet lens. The concave first side and convex second side of the eighth lens increase the optical path of the edge field of view rays, making the distinction between them and the center field of view rays more obvious, which is beneficial for improving resolution.

[0189] In this embodiment, the first side surface of the ninth lens is convex, and the second side surface is concave. The ninth lens is preferably aspherical, with negative optical power and a convex-concave shape, so that as many peripheral large-angle rays as possible can smoothly transition to the rear optical system, correcting astigmatism and field curvature, and improving the resolving power of the optical system.

[0190] This application employs nine lenses. By optimizing the optical power and surface shape of each lens, the optical lens of this invention has at least one beneficial effect, such as small aperture, high resolution, low sensitivity, low distortion, high light transmission, large aperture, and high relative illumination.

[0191] In this embodiment, the fifth and sixth lenses are cemented together to form a cemented doublet, and the seventh and eighth lenses are cemented together to form another cemented doublet. By using cemented doublets, light rays from the front lens can be smoothly transitioned to the rear optical system, reducing the overall length of the optical lens. This allows for sufficient correction of various aberrations in the optical system, improving resolution and optimizing optical performance such as distortion and CRA while maintaining a compact structure. Using cemented doublets reduces the air gap between the two lenses, decreasing the overall system length; the complementary dispersion of the two lenses in a cemented doublet helps reduce chromatic aberration and improve image quality; it also reduces the number of assembly components between the two lenses, simplifying processes and lowering costs; furthermore, it reduces field curvature, which can correct off-axis point aberrations. It also allows for reasonable focal length allocation, facilitating thermal compensation and achieving good temperature performance.

[0192] In this embodiment, the optical lens also includes an aperture stop, which is disposed between the sixth lens and the seventh lens. The aperture stop's placement between the sixth and seventh lenses facilitates effective light convergence entering the optical system, reduces the lens aperture at the rear of the optical system, and lowers the system's assembly sensitivity.

[0193] In this embodiment, the first side surface of the second lens is inverted, and / or the first side surface of the ninth lens is inverted. Inverting the surface helps to balance aberrations and improve resolution.

[0194] In this embodiment, both the second and ninth lenses are aspherical lenses. Using two aspherical lenses is beneficial for correcting system aberrations and improving resolution.

[0195] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane of the optical lens, and the optical back focal length, i.e., the distance BFL from the center of the second side surface of the last lens to the center of the imaging plane, satisfy the condition: BFL / TTL ≥ 0.01. Satisfying this condition meets the special requirements for the back focal length of the optical lens and also provides space for the installation and focusing of optical components, avoiding mechanical interference. Preferably, BFL / TTL ≥ 0.1.

[0196] 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 corresponding to the maximum field of view of the optical lens satisfy the condition: D / H / θ≤3. Satisfying this condition allows the optical lens to have a large target surface and a small aperture under a fixed focal length. Preferably, D / H / θ≤2.

[0197] 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 total focal length F of the optical lens satisfy the condition: D / H / F≤3. Satisfying this condition, under the condition of a fixed focal length, provides the optical lens with the characteristics of a large target surface and a small aperture. Preferably, D / H / F≤1.

[0198] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 6 ≤ TTL / F ≤ 30. If TTL / F is too small, the system sensitivity will be high; if TTL / F is large, it is beneficial for resolution and system sensitivity. Therefore, considering cost, miniaturization, system resolution, and sensitivity protection, a range is considered. Preferably, 8.5 ≤ TTL / F ≤ 15.

[0199] 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: 0.01 ≤ R7 / R8 ≤ 5. By rationally configuring the radius of curvature of the fourth lens, the light collected by the third lens is compressed, resulting in a relatively smooth light path and a stable transition of light to the rear. This effectively reduces system aberrations and improves system imaging quality. If the value is below the lower limit of the condition, the incident angle of the light rays incident on the first side surface of the fourth lens increases, leading to a decrease in relative illumination. Therefore, satisfying this condition allows for the acquisition of a high-quality, bright image. Preferably, 0.1 ≤ R7 / R8 ≤ 3.

[0200] In this embodiment, the radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the condition: 0.01 ≤ (R1-R2) / (R1+R2) ≤ 0.85. Satisfying this condition corrects aberrations in the optical system and ensures that when light rays exiting the first lens are incident on the first side surface of the second lens, the incident light is relatively smooth, thereby reducing the tolerance sensitivity of the optical system. Preferably, 0.1 ≤ (R1-R2) / (R1+R2) ≤ 0.6.

[0201] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens satisfy the following condition: |(HF×θ) / (F×θ)|≤0.5. This ensures that increasing the focal length of the optical lens, while keeping the field of view and image plane size constant, enhances the imaging effect in the central region of the image plane. Preferably, |(HF×θ) / (F×θ)|≤0.25.

[0202] In this embodiment, the entrance pupil diameter ENPD of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: ENPD / H ≥ 0.01. While ensuring that the field of view and image plane size of the optical lens remain unchanged, a larger entrance pupil diameter is beneficial for increasing light transmission and improving relative illumination. Preferably, ENPD / H ≥ 0.1.

[0203] In this embodiment, the focal length F9 of the ninth lens satisfies the condition F9 / F ≤ -0.01 with the total focal length F of the optical lens. By rationally allocating the focal length of the ninth lens, light can enter the optical system smoothly, which is beneficial for light collection, ensuring light transmission, and improving resolution. Preferably, F9 / F ≤ -0.1.

[0204] In this embodiment, 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: 0.01 ≤ F / H ≤ 1. By controlling the focal length and image height within a certain range, it is beneficial to improve resolution. Preferably, 0.1 ≤ F / H ≤ 0.8.

[0205] In this embodiment, the angle subtended by the second side of the first lens, arctan(1 / K(S2)), satisfies: arctan(1 / K(S2)) ≥ 35°. A larger angle subtended by the second side of the first lens facilitates rapid focusing of large-angle peripheral light rays entering through the first lens, thus improving image quality. Preferably, arctan(1 / K(S2)) ≥ 50°.

[0206] In this embodiment, the focal length F6 of the sixth lens satisfies the condition |F6 / F|≥0.01 with the overall focal length F of the optical lens. Properly allocating the focal length of the sixth lens allows light to enter the rear optical system smoothly, while also improving light collection, ensuring sufficient light transmission, and enhancing resolution. Preferably, |F6 / F|≥0.1.

[0207] In this embodiment, the sagitta SAG1 of the first side surface of the first lens and the sagitta SAG2 of the second side surface of the first lens satisfy the condition: 0.05 ≤ |SAG2 / SAG1|. The significant difference in the sagitta R between the two sides of the first lens is beneficial for light collection, allowing for a smooth transition of light to the rear, and effectively reducing system aberrations and improving system imaging quality. Preferably, 0.5 ≤ |SAG2 / SAG1|.

[0208] In this embodiment, the radius of curvature R15 of the first side surface of the eighth lens satisfies the condition R15 / F ≤ 5 with respect to the overall focal length F of the optical lens. Through the reasonable configuration of the radius of curvature of the object side surface of the eighth lens, the light path is made relatively gentle, thus allowing the light to smoothly transition to the rear. This effectively reduces system aberrations and improves the system's imaging quality. Preferably, R15 / F ≤ 3.

[0209] In this embodiment, the focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the condition |F7 / F8|≤8. By setting the focal lengths of the two lenses in the cemented doublet to be similar, it is beneficial to correct chromatic aberration and improve image quality. Preferably, |F7 / F8|≤6.5.

[0210] In this embodiment, the distance d4 between the second and third lenses satisfies the following condition with respect to the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane of the optical lens: d4 / TTL ≥ 0.125. The second and third lenses account for a large proportion of the overall weight of the optical lens. Properly setting the distance between the second and third lenses helps to center the center of gravity of the entire system, effectively reducing system sensitivity. Preferably, d4 / TTL ≥ 0.15.

[0211] In this embodiment, the focal length F2 of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following relationship: -5 ≤ F2 / R4 ≤ -0.1. By appropriately matching the focal length and radius of curvature of the second side surface, and considering that the second side surface of the second lens is concave, controlling the second lens to have a negative optical power is beneficial for collecting light rays entering through the first lens, preventing excessive divergence of light rays from the first side, and facilitating control of the aperture of the rear lens. The combination of the second and first lenses, with two meniscus lenses of the same negative optical power in the same direction, results in a smoother outgoing light beam, which is beneficial for achieving low distortion. Preferably, -2.5 ≤ F2 / R4 ≤ -1.

[0212] Optionally, the optical lens may also include a filter located on the second side of the ninth lens and a protective glass for protecting the photosensitive element located on the imaging surface.

[0213] The optical lens in this application can employ multiple lenses, such as the nine lenses mentioned above. This application does not specifically limit the number of spherical and aspherical lenses; the number of aspherical lenses can be increased when image quality is a primary concern. Aspherical lenses are characterized by a continuously changing curvature from the lens center to the periphery. Unlike spherical lenses, which have a constant curvature from the lens center to the periphery, aspherical lenses have superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. Using aspherical lenses can minimize aberrations that occur during imaging, thereby improving image quality.

[0214] In this exemplary embodiment, the solution is not limited to using plastic or glass for the lenses. If temperature performance is a primary concern, the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth 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 disruption to the normal use of the optical lens. For example, an all-glass optical lens has a wider temperature range, maintaining stable optical performance within the range of -40℃ to 105℃. Specifically, when resolving quality and reliability are of primary concern, the first to ninth lenses can all be aspherical glass lenses. Of course, in applications where temperature stability requirements are lower, the first to ninth lenses in the optical lens can also be made entirely of plastic. Using plastic to make optical lenses can effectively reduce manufacturing costs. Alternatively, the first to ninth lenses in the optical lens can also be made of a combination of plastic and glass.

[0215] This application also provides an electronic device, including the aforementioned optical lens and an imaging element that converts 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.

[0216] 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 nine lenses are described as an example in the embodiments, the optical lens is not limited to including nine lenses. If necessary, the optical lens may also include other numbers of lenses.

[0217] 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.

[0218] It should be noted that any of the following examples, from Example 1 to Example 14, are applicable to all embodiments of this application.

[0219] Example 1

[0220] like Figure 1 The diagram shown is a schematic of the optical lens structure of Example 1.

[0221] like Figure 1 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0222] The first lens L1 has negative 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 convex, 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 negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0223] In this example, the total effective focal length F of the optical lens is 7.839mm, the total length TTL of the optical lens is 79.887mm, and the entrance pupil diameter ENPD of the optical lens is 3.920mm.

[0224] Table 1 shows the basic structural parameters of the optical lens in Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0225] Surf Radius Thickness Nd Vd 1 21.034 1.622 1.95 17.94 2 11.479 6.263 3 -200.000 1.287 1.59 61.16 4 12.520 16.721 5 98.012 3.026 1.81 33.29 6 -45.806 15.833 7 21.567 2.874 2.00 25.44 8 112.991 6.506 9 99.955 0.700 1.85 23.79 10 10.437 2.725 1.44 95.10 11 -25.299 0.199 STO Infinity -0.099 13 16.281 3.155 1.50 81.59 14 -8.017 4.029 1.85 23.79 15 -12.089 0.100 16 53.870 3.455 1.81 41.00 17 13.865 2.000 18 Infinity 1.000 1.52 64.21 19 Infinity 8.491 20 Infinity -0.205 IMA / /

[0226] Table 1

[0227] In Example 1, the surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0228]

[0229] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; A, B, C, D, E, F, and G are all higher-order coefficients. Table 2 below shows the conic coefficient k and the higher-order coefficients A, B, C, D, E, F, and G that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 1.

[0230]

[0231] Table 2

[0232] Example 2

[0233] like Figure 2 The diagram shown is a schematic of the optical lens structure for Example 2. For the sake of brevity, descriptions similar to those in Example 1 will be omitted in this example and the following examples.

[0234] like Figure 2 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0235] The first lens L1 has negative 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 convex, 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 negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0236] In this example, the total effective focal length F of the optical lens is 7.897mm, the total length TTL of the optical lens is 79.887mm, and the entrance pupil diameter ENPD of the optical lens is 3.949mm.

[0237] Table 3 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).

[0238] Surf Radius Thickness Nd Vd 1 21.034 1.622 1.95 17.94 2 11.479 6.263 3 -200.000 1.287 1.59 61.16 4 12.520 16.721 5 98.012 3.026 1.81 33.29 6 -45.806 15.833 7 21.567 2.874 2.00 25.44 8 112.991 6.506 9 99.955 0.700 1.85 23.79 10 10.333 2.725 1.44 95.10 11 -25.299 0.199 STO Infinity -0.099 13 16.281 3.155 1.50 81.59 14 -8.017 4.029 1.85 23.79 15 -12.089 0.100 16 53.870 3.455 1.81 41.00 17 13.865 2.000 18 Infinity 1.000 1.52 64.21 19 Infinity 8.491 20 Infinity -0.009 IMA / /

[0239] Table 3

[0240] Table 4 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 2.

[0241]

[0242] Table 4

[0243] Example 3

[0244] like Figure 3 The diagram shown is a schematic of the optical lens structure in Example 3.

[0245] like Figure 3 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0246] The first lens L1 has negative 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 convex, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, 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 negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0247] In this example, the total effective focal length F of the optical lens is 7.877mm, the total length TTL of the optical lens is 79.873mm, and the entrance pupil diameter ENPD of the optical lens is 3.938mm.

[0248] In this example, both the first side surface S3 of the second lens and the first side surface S16 of the ninth lens are curved.

[0249] Table 5 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).

[0250] Surf Radius Thickness Nd Vd 1 21.869 1.836 1.95 17.94 2 11.403 5.697 3 250.000 1.300 1.59 61.15 4 11.636 16.773 5 95.863 4.197 1.81 33.29 6 -46.238 15.441 7 20.625 2.295 2.00 25.43 8 94.373 6.723 9 85.425 0.650 1.85 23.78 10 10.117 2.696 1.44 95.10 11 -25.839 0.335 STO Infinity -0.235 13 16.874 3.124 1.50 81.61 14 -7.848 3.864 1.85 23.78 15 -11.799 0.101 16 64.106 3.468 1.81 40.99 17 14.419 2.000 18 Infinity 1.000 1.52 64.20 19 Infinity 8.607 20 Infinity -0.052 IMA / /

[0251] Table 5

[0252] Table 6 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 3.

[0253]

[0254] Table 6

[0255] Example 4

[0256] like Figure 4 The diagram shown is a schematic of the optical lens structure of Example 4.

[0257] like Figure 4 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0258] The first lens L1 has negative 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 convex, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, 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 negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0259] In this example, the total effective focal length F of the optical lens is 7.869mm, the total length TTL of the optical lens is 79.846mm, and the entrance pupil diameter ENPD of the optical lens is 3.935mm.

[0260] In this example, both the first side surface S3 of the second lens and the first side surface S16 of the ninth lens are curved.

[0261] Table 7 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).

[0262] Surf Radius Thickness Nd Vd 1 21.869 1.836 1.95 17.94 2 11.403 5.697 3 250.000 1.300 1.59 61.15 4 11.636 16.773 5 95.863 4.197 1.81 33.29 6 -46.238 15.441 7 20.625 2.295 2.00 25.43 8 93.430 6.723 9 85.425 0.650 1.85 23.78 10 10.117 2.669 1.44 95.10 11 -25.580 0.335 STO Infinity -0.235 13 16.874 3.124 1.50 81.61 14 -7.848 3.864 1.85 23.78 15 -11.799 0.101 16 64.106 3.468 1.81 40.99 17 14.419 2.000 18 Infinity 1.000 1.52 64.20 19 Infinity 8.607 20 Infinity -0.038 IMA / /

[0263] Table 7

[0264] Table 8 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 4.

[0265]

[0266] Table 8

[0267] Example 5

[0268] like Figure 5 The diagram shown is a schematic of the optical lens structure of Example 5.

[0269] like Figure 5 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0270] The first lens L1 has negative 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 convex, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S7 is convex, and its second side surface S8 is concave. The fifth lens L5 has negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0271] In this example, the total effective focal length F of the optical lens is 7.349mm, the total length TTL of the optical lens is 79.950mm, and the entrance pupil diameter ENPD of the optical lens is 3.675mm.

[0272] Table 9 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).

[0273] Surf Radius Thickness Nd Vd 1 19.199 2.500 1.95 17.94 2 11.998 8.310 3 -200.000 1.300 1.59 61.15 4 10.574 16.599 5 67.211 4.789 1.81 33.29 6 -41.733 15.674 7 19.318 4.487 2.00 25.43 8 14.478 0.100 9 10.095 2.749 1.85 23.78 10 8.142 2.929 1.44 95.10 11 -216.090 -0.047 STO Infinity 1.412 13 12.069 3.567 1.50 81.61 14 -9.481 2.651 1.85 23.78 15 -17.553 0.100 16 26.494 2.850 1.81 40.99 17 11.675 2.000 18 Infinity 1.000 1.52 64.20 19 Infinity 6.698 20 Infinity 0.281 IMA / /

[0274] Table 9

[0275] Table 10 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 5.

[0276]

[0277] Table 10

[0278] Example 6

[0279] like Figure 6 The diagram shown is a schematic of the optical lens structure of Example 6.

[0280] like Figure 6 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0281] The first lens L1 has negative 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 convex, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S7 is convex, and its second side surface S8 is concave. The fifth lens L5 has negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0282] In this example, the total effective focal length F of the optical lens is 7.348mm, the total length TTL of the optical lens is 80.165mm, and the entrance pupil diameter ENPD of the optical lens is 3.674mm.

[0283] Table 11 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).

[0284]

[0285]

[0286] Table 11

[0287] Table 12 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example Six.

[0288]

[0289] Table 12

[0290] Example 7

[0291] like Figure 7 The diagram shown is a schematic of the optical lens structure of Example 7.

[0292] like Figure 7 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0293] The first lens L1 has negative 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 convex, 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 negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0294] In this example, the total effective focal length F of the optical lens is 7.797mm, the total length TTL of the optical lens is 79.893mm, and the entrance pupil diameter ENPD of the optical lens is 3.898mm.

[0295] In this example, both the first side surface S3 of the second lens and the first side surface S16 of the ninth lens are curved.

[0296] Table 13 shows the basic structural parameters of the optical lens of Example 7, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0297] Surf Radius Thickness Nd Vd 1 20.015 1.534 1.95 17.94 2 10.802 5.829 3 97.019 1.300 1.59 61.15 4 10.887 16.478 5 -999.000 3.814 1.81 33.29 6 -30.673 16.383 7 21.559 2.171 2.00 25.43 8 120.959 6.757 9 47.989 0.650 1.85 23.78 10 9.178 2.851 1.44 95.10 11 -25.455 0.461 STO Infinity -0.361 13 19.798 2.993 1.50 81.61 14 -7.851 3.817 1.85 23.78 15 -11.946 0.100 16 71.869 3.481 1.81 40.99 17 15.196 2.000 18 Infinity 1.000 1.52 64.20 19 Infinity 8.635 20 Infinity -2.266 IMA / /

[0298] Table 13

[0299] Table 14 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 7.

[0300]

[0301] Table 14

[0302] Example 8

[0303] like Figure 8 The diagram shown is a schematic of the optical lens structure of Example 8.

[0304] like Figure 8 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0305] The first lens L1 has negative 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 convex, 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 negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0306] In this example, the total effective focal length F of the optical lens is 7.801mm, the total length TTL of the optical lens is 79.890mm, and the entrance pupil diameter ENPD of the optical lens is 3.901mm.

[0307] In this example, both the first side surface S3 of the second lens and the first side surface S16 of the ninth lens are curved.

[0308] Table 15 shows the basic structural parameters of the optical lens of Example 8, where the units for radius of curvature (Radius) and thickness (Thickness / Distance) are millimeters (mm).

[0309]

[0310]

[0311] Table 15

[0312] Table 16 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 8.

[0313]

[0314] Table 16

[0315] Example 9

[0316] like Figure 9 The diagram shown is a schematic of the optical lens structure of Example 9.

[0317] like Figure 9 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0318] The first lens L1 has negative 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 convex, 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 negative optical power, its first side surface S9 is concave, and its second side surface S10 is concave. The sixth lens L6 has positive optical power, its first side surface S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0319] In this example, the total effective focal length F of the optical lens is 7.824mm, the total length TTL of the optical lens is 79.898mm, and the entrance pupil diameter ENPD of the optical lens is 3.912mm.

[0320] In this example, the first side surface S16 of the ninth lens is curved.

[0321] Table 17 shows the basic structural parameters of the optical lens of Example 9, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0322] Surf Radius Thickness Nd Vd 1 23.577 1.500 1.95 17.94 2 12.261 5.526 3 -199.980 1.300 1.59 61.15 4 12.533 16.531 5 71.624 3.778 1.81 33.29 6 -54.679 15.831 7 22.386 2.955 2.00 25.43 8 164.901 6.657 9 -100.000 0.650 1.85 23.78 10 13.054 2.600 1.44 95.10 11 -18.926 -0.088 STO Infinity 0.188 13 15.124 3.260 1.50 81.61 14 -7.960 4.378 1.85 23.78 15 -11.850 0.100 16 46.835 3.397 1.81 40.99 17 12.964 2.000 18 Infinity 1.000 1.52 64.20 19 Infinity 8.336 20 Infinity -0.329 IMA / /

[0323] Table 17

[0324] Table 18 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 9.

[0325]

[0326]

[0327] Table 18

[0328] Example 10

[0329] like Figure 10 The diagram shown is a schematic of the optical lens structure of Example 10.

[0330] like Figure 10 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0331] The first lens L1 has negative 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 convex, 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 negative optical power, its first side surface S9 is concave, and its second side surface S10 is concave. The sixth lens L6 has positive optical power, its first side surface S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0332] In this example, the total effective focal length F of the optical lens is 7.824mm, the total length TTL of the optical lens is 79.895mm, and the entrance pupil diameter ENPD of the optical lens is 3.912mm.

[0333] In this example, the first side surface S16 of the ninth lens is curved.

[0334] Table 19 shows the basic structural parameters of the optical lens of Example 10, where the units for radius of curvature (Radius) and thickness (Thickness / Distance) are millimeters (mm).

[0335]

[0336]

[0337] Table 19

[0338] Table 20 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 10.

[0339]

[0340] Table 20

[0341] Example 11

[0342] like Figure 11 The diagram shown is a schematic of the optical lens structure of Example 11.

[0343] like Figure 11 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0344] The first lens L1 has negative 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 convex, 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 negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has negative optical power, its first side surface S13 is convex, and its second side surface S14 is concave. The eighth lens L8 has positive optical power. Its first side surface S14 and second side surface S15 are both convex. The ninth lens L9 has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0345] In this example, the total effective focal length F of the optical lens is 7.676mm, the total length TTL of the optical lens is 79.900mm, and the entrance pupil diameter ENPD of the optical lens is 3.838mm.

[0346] Table 21 shows the basic structural parameters of the optical lens in Example 11, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0347] Surf Radius Thickness Nd Vd 1 18.054 2.391 1.95 17.94 2 11.212 7.326 3 -327.280 1.300 1.59 61.15 4 11.067 15.528 5 231.043 3.705 1.81 33.29 6 -37.382 13.120 7 26.465 2.212 2.00 25.43 8 475.748 5.358 9 116.981 0.650 1.85 23.78 10 9.887 6.000 1.44 95.10 11 -26.072 0.075 STO Infinity 1.940 13 11.760 3.674 1.85 23.78 14 8.333 4.193 1.50 81.61 15 -16.679 0.100 16 82.028 2.299 1.81 40.99 17 16.931 2.000 18 Infinity 1.000 1.52 64.20 19 Infinity 7.031 20 Infinity -0.286 IMA / /

[0348] Table 21

[0349] Table 22 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example 11.

[0350]

[0351] Table 22

[0352] Example 12

[0353] like Figure 12 The diagram shown is a schematic of the optical lens structure of Example Twelve.

[0354] like Figure 12 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0355] The first lens L1 has negative 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 convex, 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 negative 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 S10 is convex, and its second side surface S11 is convex. The seventh lens L7 has negative optical power, its first side surface S13 is convex, and its second side surface S14 is concave. The eighth lens L8 has positive optical power. Its first side surface S14 and second side surface S15 are both convex. The ninth lens L9 has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0356] In this example, the total effective focal length F of the optical lens is 7.670mm, the total length TTL of the optical lens is 79.878mm, and the entrance pupil diameter ENPD of the optical lens is 3.835mm.

[0357] Table 23 shows the basic structural parameters of the optical lens of Example Twelve, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0358]

[0359]

[0360] Table 23

[0361] Table 24 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example Twelve.

[0362]

[0363] Table 24

[0364] Example Thirteen

[0365] like Figure 13 The diagram shown is a schematic of the optical lens structure of Example Thirteen.

[0366] like Figure 13 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0367] The first lens L1 has negative 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 convex, 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 convex. The sixth lens L6 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0368] In this example, the total effective focal length F of the optical lens is 7.743mm, the total length TTL of the optical lens is 78.293mm, and the entrance pupil diameter ENPD of the optical lens is 3.872mm.

[0369] In this example, both the first side surface S3 of the second lens and the first side surface S16 of the ninth lens are curved.

[0370] Table 25 shows the basic structural parameters of the optical lens of Example Thirteen, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0371] Surf Radius Thickness Nd Vd 1 18.590 1.500 1.95 17.94 2 9.807 6.685 3 -200.000 1.300 1.59 61.15 4 15.413 15.000 5 39.893 12.978 1.81 33.29 6 -6570.378 7.132 7 16.023 2.216 2.00 25.43 8 35.647 8.106 9 11.741 2.590 1.44 95.10 10 -24.723 0.700 1.85 23.78 11 15.107 0.769 STO Infinity -0.669 13 10.243 3.187 1.50 81.61 14 -8.148 2.495 1.85 23.78 15 -11.324 0.131 16 31.113 3.758 1.81 40.99 17 11.939 2.000 18 Infinity 1.000 1.52 64.20 19 Infinity 7.415 20 Infinity -0.432 IMA / /

[0372] Table 25

[0373] Table 26 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example Thirteen.

[0374]

[0375] Table 26

[0376] Example Fourteen

[0377] like Figure 14 The diagram shown is a schematic of the optical lens structure of Example Fourteen.

[0378] like Figure 14 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, aperture STO, seventh lens L7, eighth lens L8, ninth lens L9, first side surface S18 of the protective glass, second side surface S19 of the protective glass, and imaging surface IMA.

[0379] The first lens L1 has negative 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 convex, 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 convex. The sixth lens L6 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has negative optical power. Its first side surface S14 is concave, and its second side surface S15 is convex. The ninth lens L9 also has negative optical power. Its first side surface S16 is convex, and its second side surface S17 is concave. Light from the first side passes sequentially through surfaces S1 to S19 and is finally imaged onto the imaging plane IMA. S20 is used to assist focusing during the optimization process and does not actually exist. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S10 of the fifth lens and the first side surface S10 of the sixth lens are the same surface. Similarly, since the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet, the second side surface S14 of the seventh lens and the first side surface S14 of the eighth lens are the same surface.

[0380] In this example, the total effective focal length F of the optical lens is 7.683mm, the total length TTL of the optical lens is 78.105mm, and the entrance pupil diameter ENPD of the optical lens is 3.842mm.

[0381] In this example, both the first side surface S3 of the second lens and the first side surface S16 of the ninth lens are curved.

[0382] Table 27 shows the basic structural parameters of the optical lens of Example Fourteen, where the units for radius of curvature (Radius) and thickness (Thickness / Distance) are millimeters (mm).

[0383]

[0384]

[0385] Table 27

[0386] Table 28 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S3, S4, S16, and S17 in Example Fourteen.

[0387] Higher order terms / 4 6 8 10 12 14 16 Surf K A B C D E F G 3 -99 1.9792E-04 -6.5984E-06 1.5785E-07 -2.6182E-09 2.7455E-11 -1.6142E-13 4.0161E-16 4 -3.5418 2.0395E-04 -7.5345E-06 1.8053E-07 -3.2363E-09 3.6399E-11 -2.2895E-13 5.8729E-16 16 -53.606 -3.4738E-04 -1.0629E-05 5.4238E-07 -4.0396E-08 2.0985E-09 -5.7538E-11 6.355E-13 17 -3.4806 -4.5887E-04 -2.5019E-06 5.0391E-07 -4.2368E-08 2.3522E-09 -6.7644E-11 7.7105E-13

[0388] Table 28 summarizes that Examples 1 to 14 satisfy the relationships shown in Table 29.

[0389]

[0390]

[0391] Table 29

[0392] Table 30 gives the effective focal length F of the optical lenses in Examples 1 to 14, and the effective focal lengths of each lens from F1 to F9, etc. (unit: mm).

[0393]

[0394]

[0395] Table 30

[0396] 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.

[0397] 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.

[0398] 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.

[0399] 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 total number of lenses of the optical lens is nine, sequentially comprising from the first side to the second side: a first lens with negative refractive power, the first side of the first lens being convex, and the second side being concave; a second lens with negative refractive power, the second side of the second lens being concave; a third lens with positive refractive power, the second side of the third lens being convex; a fourth lens with refractive power, the first side of the fourth lens being convex, and the second side being concave; a fifth lens with refractive power; a sixth lens with refractive power; a seventh lens with refractive power, the first side of the seventh lens being convex; an eighth lens with refractive power, the second side of the eighth lens being convex; a ninth lens with negative refractive power, the first side of the ninth lens being convex, and the second side being concave; the fifth lens and the sixth lens are cemented to form a double-cemented lens, and the seventh lens and the eighth lens are cemented to form a double-cemented lens.

2. The optical lens of claim 1, wherein, The first side of the second lens is concave.

3. The optical lens of claim 1, wherein, The first side of the second lens is convex.

4. The optical lens of claim 1, wherein, The first side of the third lens is concave.

5. The optical lens of claim 1, wherein, The first side of the third lens is convex.

6. The optical lens of claim 1, wherein, The fourth lens has positive refractive power.

7. The optical lens of claim 1, wherein, The fourth lens has negative refractive power.

8. The optical lens of claim 1, wherein, The fifth lens has negative refractive power, the first side of the fifth lens being convex, and the second side being concave.

9. The optical lens of claim 1, wherein, The fifth lens has negative refractive power, the first side of the fifth lens being concave, and the second side being concave.

10. The optical lens of claim 1, wherein, The fifth lens has positive refractive power, the first side of the fifth lens being convex, and the second side being convex.

11. The optical lens of claim 1, wherein, The sixth lens has positive refractive power, the first side of the sixth lens being convex, and the second side being convex.

12. The optical lens of claim 1, wherein, The sixth lens has negative refractive power, the first side of the sixth lens being concave, and the second side being concave.

13. The optical lens of claim 1, wherein, The seventh lens has positive refractive power, the second side of the seventh lens being convex.

14. The optical lens of claim 1, wherein, The seventh lens has negative refractive power, the second side of the seventh lens being concave.

15. The optical lens of claim 1, wherein, The eighth lens has positive refractive power, the first side of the eighth lens being convex.

16. The optical lens of claim 1, wherein, The eighth lens has negative refractive power, the first side of the eighth lens being concave.

17. The optical lens of claim 1, wherein, The optical lens further comprises a diaphragm, which is arranged between the sixth lens and the seventh lens.

18. The optical lens of claim 1, wherein, The first side of the second lens is provided with a reverse curve, and / or the first side of the ninth lens is provided with a reverse curve.

19. The optical lens of claim 1, wherein, The second lens and the ninth lens are both aspherical lenses.

20. The optical lens of any of claims 1 to 19, wherein, The total optical length of the optical lens, that is, the distance TTL between the first side center of the first lens of the optical lens and the center of the imaging surface of the optical lens, and the optical back focal length of the optical lens, that is, the distance BFL between the second side center of the last lens of the optical lens and the center of the imaging surface, satisfy: 0.146≥BFL / TTL≥0.

1.

21. The optical lens of any of claims 1 to 19, wherein, The maximum light aperture D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the radian value θ corresponding to the maximum field of view angle of the optical lens satisfy: 1.344≤D / H / θ≤2.

22. The optical lens of any of claims 1 to 19, wherein, The maximum aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the total focal length F of the optical lens satisfy: 0.248≤D / H / F≤1.

23. The optical lens of any of claims 1 to 19, wherein, The total optical length TTL of the optical lens, i.e., the distance from the center of the first side surface of the first lens of the optical lens to the center of the imaging surface of the optical lens, and the total focal length F of the optical lens satisfy: 8.5≤TTL / F≤15.

24. The optical lens of any of claims 1 to 19, wherein, 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: 0.01≤R7 / R8≤3.

25. The optical lens of any of claims 1 to 19, wherein, The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy: 0.1≤(R1-R2) / (R1+R2)≤0.

6.

26. The optical lens of any of claims 1 to 19, wherein, The image height H corresponding to the maximum field angle of the optical lens, the total focal length F of the optical lens, and the radian value θ corresponding to the maximum field angle of the optical lens satisfy: |(H-F×θ) / (F×θ)|≤0.

25.

27. The optical lens of any of claims 1 to 19, wherein, The entrance pupil diameter ENPD of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.331≥ENPD / H≥0.

1.

28. The optical lens of any of claims 1 to 19, wherein, The focal length F9 of the ninth lens and the total focal length F of the optical lens satisfy: -3.794≤F9 / F≤-0.

1.

29. The optical lens of any of claims 1 to 19, wherein, The total focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.1≤F / H≤0.

8.

30. The optical lens of any of claims 1 to 19, wherein, The opening angle of the second side surface of the first lens arctan(1 / K(S2)) satisfies: 68.883≥arctan(1 / K(S2))≥50.

31. The optical lens of any of claims 1 to 19, wherein, The radius of curvature R8 of the second side surface of the fourth lens and the total focal length F of the optical lens satisfy: 62.031≥R8 / F≥0.

1.

32. The optical lens of any of claims 1 to 19, wherein, The focal length F6 of the sixth lens and the total focal length F of the optical lens satisfy: 2.441≥|F6 / F|≥0.

1.

33. The optical lens of any of claims 1 to 19, wherein, The sag SAG1 of the first side surface of the first lens and the sag SAG2 of the second side surface of the first lens satisfy: 0.5≤|SAG2 / SAG1|≤1.

480.

34. The optical lens of any of claims 1 to 19, wherein, The radius of curvature R15 of the first side surface of the eighth lens and the total focal length F of the optical lens satisfy: -1.290≤R15 / F≤3.

35. The optical lens of any of claims 1 to 19, wherein, The focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy: 0.182≤|F7 / F8|≤6.

5.

36. The optical lens of any of claims 1 to 19, wherein, The distance d4 between the second lens and the third lens and the total optical length TTL of the optical lens, i.e., the distance from the center of the first side surface of the first lens of the optical lens to the center of the imaging surface of the optical lens, satisfy: 0.210≥d4 / TTL≥0.

15.

37. The optical lens of any of claims 1 to 19, wherein, The focal length F2 of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy: -2.5≤F2 / R4≤-1.

38. An optical lens, characterized in that, The total number of the lenses of the optical lens is nine, sequentially comprising from the first side to the second side: a first lens with negative refractive power, the first side of the first lens is convex, and the second side of the first lens is concave; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with refractive power, the first side of the fourth lens is convex; a fifth lens with refractive power; a sixth lens with refractive power; a seventh lens with refractive power, the first side of the seventh lens is convex; an eighth lens with refractive power, the second side of the eighth lens is convex; a ninth lens with negative refractive power; the fifth lens and the sixth lens are cemented to form a double-cemented lens, and the seventh lens and the eighth lens are cemented to form a double-cemented lens; the radius of curvature R8 of the second side of the fourth lens and the total focal length F of the optical lens satisfy: 1.970≤R8 / F≤62.

031.

39. The optical lens of claim 38, wherein, the first side of the second lens is concave, and the second side of the second lens is concave.

40. The optical lens of claim 38, wherein, the first side of the second lens is convex, and the second side of the second lens is concave.

41. The optical lens of claim 38, wherein, the first side of the third lens is concave, and the second side of the third lens is convex.

42. The optical lens of claim 38, wherein, the first side of the third lens is convex, and the second side of the third lens is convex.

43. The optical lens of claim 38, wherein, the fourth lens has positive refractive power, and the second side of the fourth lens is concave.

44. The optical lens of claim 38, wherein, the fourth lens has negative refractive power, and the second side of the fourth lens is concave.

45. The optical lens of claim 38, wherein, the fifth lens has negative refractive power, the first side of the fifth lens is convex, and the second side of the fifth lens is concave.

46. The optical lens of claim 38, wherein, the fifth lens has negative refractive power, the first side of the fifth lens is concave, and the second side of the fifth lens is concave.

47. The optical lens of claim 38, wherein, the fifth lens has positive refractive power, the first side of the fifth lens is convex, and the second side of the fifth lens is convex.

48. The optical lens of claim 38, wherein, the sixth lens has positive refractive power, the first side of the sixth lens is convex, and the second side of the sixth lens is convex.

49. The optical lens of claim 38, wherein, the sixth lens has negative refractive power, the first side of the sixth lens is concave, and the second side of the sixth lens is concave.

50. The optical lens of claim 38, wherein, the seventh lens has positive refractive power, and the second side of the seventh lens is convex.

51. The optical lens of claim 38, wherein, the seventh lens has negative refractive power, and the second side of the seventh lens is concave.

52. The optical lens of claim 38, wherein, the eighth lens has positive refractive power, and the first side of the eighth lens is convex.

53. The optical lens of claim 38, wherein, the eighth lens has negative refractive power, and the first side of the eighth lens is concave.

54. The optical lens of claim 38, wherein, the first side of the ninth lens is convex, and the second side of the ninth lens is concave.

55. The optical lens of claim 38, wherein, The optical lens further comprises a diaphragm, which is arranged between the sixth lens and the seventh lens.

56. The optical lens of claim 38, wherein, the first side of the second lens is provided with a reverse curve, and / or the first side of the ninth lens is provided with a reverse curve.

57. The optical lens of claim 38, wherein, The second lens and the ninth lens are both aspherical lenses.

58. The optical lens of any of claims 38-57, wherein, The total optical length of the optical lens, that is, the distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens, and the optical back focal length BFL of the optical lens, that is, the distance from the second side center of the last lens of the optical lens to the center of the imaging surface, satisfy: 0.125≤BFL / TTL≤0.

146.

59. The optical lens of any of claims 38-57, wherein, The maximum light aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the radian value θ corresponding to the maximum field angle of the optical lens satisfy: 1.344≤D / H / θ≤1.

581.

60. The optical lens of any of claims 38-57, wherein, The maximum light aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the total focal length value F of the optical lens satisfy: 0.248≤D / H / F≤0.

308.

61. The optical lens of any of claims 38-57, wherein, The total optical length of the optical lens, that is, the distance TTL from the center of the first side surface of the first lens of the optical lens to the center of the imaging surface of the optical lens, and the total focal length value F of the optical lens satisfy: 10.111≤TTL / F≤10.

910.

62. The optical lens of any of claims 38-57, wherein, 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: 0.056≤R7 / R8≤1.

334.

63. The optical lens of any of claims 38-57, wherein, The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy: 0.231≤(R1-R2) / (R1+R2)≤0.

316.

64. The optical lens of any of claims 38-57, wherein, The image height H corresponding to the maximum field angle of the optical lens, the total focal length value F of the optical lens, and the radian value θ corresponding to the maximum field angle of the optical lens satisfy: 0.056≤|(H-F×θ) / (F×θ)|≤0.

128.

65. The optical lens of any of claims 38-57, wherein, The entrance pupil diameter ENPD of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.310≤ENPD / H≤0.

331.

66. The optical lens of any of claims 38-57, wherein, The focal length value F9 of the ninth lens and the total focal length value F of the optical lens satisfy: -3.794≤F9 / F≤-2.

927.

67. The optical lens of any of claims 38-57, wherein, The total focal length value F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.620≤F / H≤0.

662.

68. The optical lens of any of claims 38-57, wherein, The opening angle arctan(1 / K(S2)) of the second side surface of the first lens satisfies: 54.951≤arctan(1 / K(S2))≤68.

883.

69. The optical lens of any of claims 38-57, wherein, The focal length value F6 of the sixth lens and the total focal length value F of the optical lens satisfy: 1.390≤|F6 / F|≤2.

441.

70. The optical lens of any of claims 38-57, wherein, The sag SAG1 of the first side surface of the first lens and the sag SAG2 of the second side surface of the first lens satisfy: 1.124≤|SAG2 / SAG1|≤1.

480.

71. The optical lens of any of claims 38-57, wherein, The radius of curvature R15 of the first side surface of the eighth lens and the total focal length value F of the optical lens satisfy: -1.290≤R15 / F≤1.

087.

72. The optical lens of any of claims 38-57, wherein, The focal length value F7 of the seventh lens and the focal length value F8 of the eighth lens satisfy: 0.182≤|F7 / F8|≤5.

588.

73. The optical lens of any of claims 38-57, wherein, A distance d4 between the second lens and the third lens and an optical total length of the optical lens, i.e., a center distance TTL from a first side of the first lens of the optical lens to an imaging surface of the optical lens satisfy: 0.190≤d4 / TTL≤0.

210.

74. The optical lens of any of claims 38-57, wherein, A focal length value F2 of the second lens and a curvature radius R4 of a second side of the second lens satisfy: -1.907≤F2 / R4≤-1.

560.

75. An electronic device, comprising: An imaging device including the optical lens of any one of claims 1 to 74 and configured to convert an optical image formed by the optical lens into an electrical signal.

Images