Optical lens

Abstract

This application discloses an optical lens, which includes, in sequence along the optical axis from the object side to the image side: a first lens with negative optical power, a second lens with positive or negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power; wherein, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 0.7≤F3 / F≤1.2.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens. Background Technology

[0002] With the continuous upgrading and development of Internet technology, video cameras are widely used in shooting fields such as video conferencing, online teaching, and live streaming, and therefore the requirements for their image quality are getting higher and higher.

[0003] However, existing video lenses still have many shortcomings. For example, some existing lenses are generally too long and too large, resulting in high overall cost and weight; their thermal stability is poor, failing to meet the requirements for clear imaging in extreme temperature environments; in addition, some existing lens systems have large aberrations and poor image quality, while also exhibiting significant distortion, causing noticeable deformation of the captured image and affecting post-processing; and some existing lenses have small image spheres, failing to meet the requirements for imaging large-area chips at higher resolutions. Summary of the Invention

[0004] This application provides an optical lens that, along the optical axis from the object side to the image side, may sequentially include: a first lens with negative optical power, a second lens with positive or negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power; wherein the effective focal length F3 of the third lens and the total effective focal length F of the optical lens can satisfy: 0.7≤F3 / F≤1.2.

[0005] In one embodiment, the object-side surface of the second lens is concave, and the image-side surface is convex; the object-side surface of the third lens is convex, and the image-side surface is concave; the object-side surface of the fourth lens is convex, and the image-side surface is concave; the image-side surface of the fifth lens is convex, and the image-side surface is convex; the object-side surface of the sixth lens is convex, and the image-side surface is concave; the object-side surface of the seventh lens is convex, and the image-side surface is convex; the object-side surface of the eighth lens is convex, and the image-side surface is concave; and the object-side surface of the ninth lens is convex, and the image-side surface is concave.

[0006] In one embodiment, the fourth lens and the fifth lens are cemented doublet lenses bonded together.

[0007] In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens can satisfy: -1.6≤F1 / F≤-1.14.

[0008] In one embodiment, the radius of curvature R21 of the object side of the second lens and the total effective focal length F of the optical lens can satisfy: -1.1≤R21 / F≤-0.5.

[0009] In one embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens can satisfy: -0.9≤F4 / F≤-0.4.

[0010] In one embodiment, the effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens can satisfy: 0.4≤F5 / F≤0.8.

[0011] In one embodiment, the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens can satisfy: -2.33≤F6 / F≤-1.7.

[0012] In one embodiment, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens can satisfy: 0.41≤F7 / F≤8.69.

[0013] In one embodiment, the effective focal length F8 of the eighth lens and the total effective focal length F of the optical lens can satisfy: -3.84≤F8 / F≤-1.73.

[0014] In one embodiment, the radius of curvature R91 of the object side of the ninth lens and the radius of curvature R92 of the image side of the ninth lens can satisfy: 0.4≤R91 / R92≤0.8.

[0015] In one embodiment, the effective focal length F9 of the ninth lens and the total effective focal length F of the optical lens can satisfy: 1.1≤F9 / F≤1.8.

[0016] In one embodiment, the combined effective focal length F45 of the fourth and fifth lenses and the total effective focal length F of the optical lens can satisfy: 0≤F45 / F≤60.15.

[0017] In one embodiment, the combined effective focal length Fb of the fourth to ninth lenses and the total effective focal length F of the optical lens can satisfy: 2.71≤Fb / F≤7.42.

[0018] In one embodiment, the refractive index ND3 of the third lens can satisfy: 1.85≤ND3≤2.01.

[0019] In one implementation, the Abbe number VD5 of the fifth lens can satisfy: 60≤VD5≤95.

[0020] In one embodiment, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens can satisfy: 2.1≤F / ENPD≤2.3.

[0021] In one embodiment, the maximum aperture Dmax of the optical lens and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis can satisfy: 0.3≤Dmax / TTL≤0.5.

[0022] In one embodiment, the distance BFL from the center of the image side of the ninth lens to the imaging surface on the optical axis and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis can satisfy: 0.04≤BFL / TTL≤0.2.

[0023] In one embodiment, the optical lens may satisfy at least one of the following conditions: -1.55≤F1 / F≤-1.16; -1.06≤R21 / F≤-0.58; -0.75≤F4 / F≤-0.54; 0.55≤F5 / F≤0.68; -2.28≤F6 / F≤-1.80; 1.74≤F7 / F≤7.36; -3.54≤F8 / F≤-2.03; 0.55≤R91 / R92≤0.71; wherein, F1 is the effective focal length of the first lens, R21 is the radius of curvature of the object-side surface of the second lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, R91 is the radius of curvature of the object-side surface of the ninth lens, and R92 is the radius of curvature of the image-side surface of the ninth lens.

[0024] The optical lens according to the embodiments of this application includes first to ninth lenses arranged sequentially from the object side to the image side along the optical axis, wherein the first, fourth, sixth and eighth lenses all have negative optical power, the third, fifth, seventh and ninth lenses all have positive optical power, and the second lens may have positive or negative optical power; the effective focal length F3 of the third lens and the total effective focal length F of the lens satisfy the condition 0.7≤F3 / F≤1.2. By setting the optical lens as described above, the focal length value of the third lens is reasonably allocated, and it can be combined with a high refractive index material to correct the spherical aberration generated by the preceding optical system, which is beneficial to achieving high image quality.

[0025] The high-definition large-target optical lens provided according to the embodiments of this application adopts a nine-element architecture. By reasonably setting some parameters such as the lens's optical power, surface shape, radius of curvature, refractive index, and Abbe number, the lens can possess some or all of the characteristics such as short overall optical length, good thermal stability, high resolution, low distortion, high illumination, and the ability to achieve a large target surface. For example, the optical lens can achieve clear and stable imaging in an ambient temperature range of -30℃ to 70℃, and the optical distortion can meet the requirement of |Optical Distortion| ≤ 2.1%, and the target surface size of the lens can be greater than or equal to 1 / 1.55 ​​inch. Attached Figure Description

[0026] Other features, objects, and advantages of this application will become more apparent from the following detailed description of the embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0027] Figure 1 A schematic diagram of the structure of an optical lens according to Embodiment 1 of this application is shown;

[0028] Figure 2 A distortion curve diagram of an optical lens according to Embodiment 1 of this application is shown;

[0029] Figure 3 A relative illumination curve of an optical lens according to Embodiment 1 of this application is shown;

[0030] Figure 4 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown;

[0031] Figure 5 A distortion curve diagram of an optical lens according to Embodiment 2 of this application is shown;

[0032] Figure 6 A relative illumination curve of an optical lens according to Embodiment 2 of this application is shown;

[0033] Figure 7 A schematic diagram of the structure of an optical lens according to Embodiment 3 of this application is shown;

[0034] Figure 8 A distortion curve of an optical lens according to Embodiment 3 of this application is shown;

[0035] Figure 9 A relative illumination curve of the optical lens according to Embodiment 3 of this application is shown;

[0036] Figure 10 A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown;

[0037] Figure 11 A distortion curve of an optical lens according to Embodiment 4 of this application is shown;

[0038] Figure 12 A relative illumination curve of an optical lens according to Embodiment 4 of this application is shown. Detailed Implementation

[0039] To facilitate understanding of this application, a more complete description of the application will be provided below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] 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.

[0041] 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.

[0042] In this article, 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging side is called the image-side surface of the lens.

[0043] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0044] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] The features, principles and other aspects of this application are described in detail below.

[0047] In an exemplary embodiment, the optical lens according to this application may include, for example, nine lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. These nine lenses may be arranged sequentially along the optical axis from the object side to the image side.

[0048] In an exemplary embodiment, the first lens may have negative optical power; the second lens may have positive or negative optical power; the third lens may have positive optical power; the fourth lens may have negative optical power; the fifth lens may have positive optical power; the sixth lens may have negative optical power; the seventh lens may have positive optical power; the eighth lens may have negative optical power; and the ninth lens may have positive optical power.

[0049] In an exemplary embodiment, the first lens may have negative optical power. The object-side surface of the first lens may be convex, and the image-side surface may be concave. This configuration of the first lens facilitates light collection in the optical system, effectively increasing the field of view and illumination.

[0050] In an exemplary embodiment, the second lens may have positive or negative optical power. The object-side surface of the second lens may be concave, and the image-side surface may be convex. This configuration of the second lens can effectively control the trajectory of rays at the edge of the field of view, avoiding the generation of advanced aberrations; at the same time, it helps to balance the field curvature of the optical system and improve the imaging quality of the optical system.

[0051] In an exemplary embodiment, the third lens may have positive optical power. The object-side surface of the third lens may be convex, and the image-side surface may be concave. This configuration of the third lens helps to reduce the incident angle of on-axis rays on the object-side surface of the third lens, thereby reducing spherical aberration generated on the object-side surface of the third lens and thus contributing to high image quality. Optionally, the third lens may be made of a material with a high refractive index to reduce surface curvature, reduce aberration generation, and further contribute to high image quality.

[0052] In an exemplary embodiment, the fourth lens may have negative optical power. The object-side surface of the fourth lens may be convex, and the image-side surface may be concave. The fourth lens bears a large optical power of the system, which is beneficial for balancing spherical aberration, coma, and astigmatism of the optical system and improving the imaging quality of the optical system. The negative optical power of the fourth lens in the cemented doublet, together with the fifth lens, achieves achromaticity, which is beneficial for achieving high image quality and reducing the system's tolerance sensitivity.

[0053] In an exemplary embodiment, the fifth lens may have positive optical power. The object-side surface of the fifth lens may be convex, and the image-side surface may also be convex. The fifth lens collectively shares the optical power, reducing surface curvature and aberrations, thus contributing to high image quality. The fifth lens, having positive optical power in a cemented doublet, can preferably be paired with a low-dispersion material to achromaticize the system. It also helps suppress focus drift in high and low temperature environments, achieving high imaging quality over a wide temperature range (e.g., -30°C to 70°C).

[0054] In an exemplary embodiment, the sixth lens may have negative optical power. The object-side surface of the sixth lens may be convex, and the image-side surface may be concave. By configuring the sixth lens in this way, the angle of incidence of on-axis rays on the image-side surface of the sixth lens can be reduced, thereby reducing spherical aberration generated on the image-side surface of the sixth lens; at the same time, the trajectory of off-axis rays can be effectively controlled, allowing the light rays to smoothly transition to the rear of the optical system, thereby reducing the generation of coma and astigmatism, which is beneficial to achieving high image quality.

[0055] In an exemplary embodiment, the seventh lens may have positive optical power. The object-side surface of the seventh lens may be convex, and the image-side surface may also be convex. By configuring the seventh lens in this way, the incident angle of on-axis rays on the image-side surface of the seventh lens can be reduced, thus reducing spherical aberration generated on the image-side surface of the seventh lens, which is beneficial for achieving high image quality. At the same time, the trajectory of light rays can be effectively controlled, allowing the light rays to smoothly transition to the rear of the optical system, raising the edge field of view rays so that they can smoothly enter the image plane, which is beneficial for achieving large target surface imaging.

[0056] In an exemplary embodiment, the eighth lens may have negative optical power. The object-side surface of the eighth lens may be convex, and the image-side surface may be concave. By configuring the eighth lens in this way, the angle of incidence of off-axis rays on the image-side surface of the eighth lens can be reduced, thereby reducing coma and astigmatism, which is beneficial for achieving high image quality; at the same time, the eighth lens may be designed as an aspherical surface, which can effectively correct the distortion of the system, which is beneficial for achieving low distortion imaging.

[0057] In an exemplary embodiment, the ninth lens may have positive optical power. The object-side surface of the ninth lens may be convex, and the image-side surface may be concave. This arrangement of the ninth lens helps to correct residual astigmatism, coma, and field curvature in the system, greatly improving the imaging performance of the optical system, while effectively correcting optical distortion. The last lens having positive optical power helps to reduce the principal ray angle to match the imaging requirements of the chip.

[0058] In an exemplary embodiment, the optical lens according to this application may include at least one aperture stop. The aperture stop can constrain the optical path and control the light intensity. The aperture stop can be positioned at an appropriate location on the optical lens; for example, the aperture stop can be located between the third lens and the fourth lens. It should be noted that the positions of the aperture stops disclosed herein are merely examples and not limitations; in alternative embodiments, the aperture stop can also be positioned at other locations as needed.

[0059] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the imaging surface. Optionally, the photosensitive element disposed on the imaging surface may be, for example, a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS).

[0060] In an exemplary embodiment, the optical lens may include one or more aspherical lenses. Aspherical lenses have better radius of curvature characteristics, which has the advantages of improving distortion aberration and astigmatism aberration; by using aspherical lenses, aberrations that occur during imaging can be eliminated as much as possible, thereby improving image quality. For example, in some embodiments, the second, sixth, seventh, eighth, and ninth lenses of the optical lens may be aspherical lenses.

[0061] In an exemplary embodiment, one or more lenses in an optical lens may have a recurve point, which can be beneficial for correcting aberrations by setting the recurve.

[0062] In an exemplary embodiment, the first to ninth lenses in the optical lens can be made of a glass-plastic hybrid material. Using a glass-plastic hybrid material for each lens element can help reduce the cost of the optical system and balance the high and low temperature performance of the optical lens, enabling the lens to achieve high image quality within a range of, for example, -30°C to 70°C. In other exemplary embodiments, the first to ninth lenses in the optical lens can also be all glass lenses. Optical lenses made of glass can suppress the shift of the back focus of the optical lens with temperature changes, which is beneficial to improving system stability; it also helps the lens maintain high image quality in both high and low temperature environments. In still other exemplary embodiments, the first to ninth lenses in the optical lens can also be all plastic lenses. In applications where temperature stability requirements are low, for example, using plastic lenses can effectively reduce manufacturing costs.

[0063] In an exemplary embodiment, the fourth and fifth lenses can be cemented doublet lenses bonded together. Cemented lenses help balance various aberrations, improve resolution, and achieve high resolution; at the same time, they can reduce the tolerance sensitivity between lenses, which helps ensure production yield; and they can reduce light energy loss caused by reflection between lenses, which helps improve relative illumination.

[0064] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 0.7 ≤ F3 / F ≤ 1.2, where F3 is the effective focal length of the third lens and F is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the third lens to the total effective focal length of the optical lens within this range, the focal length value of the third lens can be reasonably allocated. Furthermore, by using a high refractive index material, spherical aberration generated by the preceding optical system can be corrected, which is beneficial for achieving high image quality.

[0065] In an exemplary embodiment, the optical lens according to this application satisfies: -1.6 ≤ F1 / F ≤ -1.14, where F1 is the effective focal length of the first lens and F is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the first lens to the total effective focal length of the optical lens within this range, the focal length value of the first lens is reasonably allocated. This allows the first lens to collect light, which is beneficial for the optical system to converge incident light from a wider field of view, increasing the field of view of the optical system and improving lens illumination. More specifically, F1 and F can further satisfy: -1.55 ≤ F1 / F ≤ -1.16.

[0066] In an exemplary embodiment, the optical lens according to this application satisfies: -1.1 ≤ R21 / F ≤ -0.5, where R21 is the radius of curvature of the object-side surface of the second lens, and F is the total effective focal length of the optical lens. By controlling the ratio of the radius of curvature of the object-side surface of the second lens to the total effective focal length of the optical lens within this range, advanced aberrations can be effectively avoided, and the field curvature of the optical system can be balanced, which is beneficial to achieving high image quality. More specifically, R21 and F can further satisfy: -1.06 ≤ R21 / F ≤ -0.58.

[0067] In an exemplary embodiment, the optical lens according to this application satisfies: -0.9 ≤ F4 / F ≤ -0.4, where F4 is the effective focal length of the fourth lens and F is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the fourth lens to the total effective focal length of the optical lens within this range, the focal length value of the fourth lens is reasonably allocated, so that the fourth lens has negative optical power in the cemented doublet, which, together with the fifth lens, achieves achromatic aberration and is beneficial to achieving high image quality. More specifically, F4 and F can further satisfy: -0.75 ≤ F4 / F ≤ -0.54.

[0068] In an exemplary embodiment, the optical lens according to this application satisfies: 0.4 ≤ F5 / F ≤ 0.8, where F5 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the fifth lens to the total effective focal length of the optical lens within this range, the focal length value of the fifth lens is reasonably allocated, enabling the fifth lens to have positive optical power in a cemented doublet, which can be combined with low dispersion materials to achromaticize the system and facilitate the achievement of high image quality. More specifically, F5 and F can further satisfy: 0.55 ≤ F5 / F ≤ 0.68.

[0069] In an exemplary embodiment, the optical lens according to this application satisfies: -2.33 ≤ F6 / F ≤ -1.7, where F6 is the effective focal length of the sixth lens and F is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the sixth lens to the total effective focal length of the optical lens within this range, the focal length value of the sixth lens is reasonably allocated to balance the spherical aberration of the optical system, which is beneficial to achieving high image quality. More specifically, F6 and F can further satisfy: -2.28 ≤ F6 / F ≤ -1.80.

[0070] In an exemplary embodiment, the optical lens according to this application satisfies: 0.41 ≤ F7 / F ≤ 8.69, where F7 is the effective focal length of the seventh lens and F is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the seventh lens to the total effective focal length of the optical lens within this range, the focal length value of the seventh lens can be reasonably allocated, effectively controlling the angle of light, which is beneficial for achieving large target surface imaging. More specifically, F7 and F can further satisfy: 1.74 ≤ F7 / F ≤ 7.36.

[0071] In an exemplary embodiment, the optical lens according to this application satisfies: -3.84 ≤ F8 / F ≤ -1.73, where F8 is the effective focal length of the eighth lens and F is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the eighth lens to the total effective focal length of the optical lens within this range, the focal length value of the eighth lens is reasonably allocated to balance the coma and astigmatism of the optical system, which is beneficial to achieving high image quality; it is also beneficial to achieving low distortion imaging. More specifically, F8 and F can further satisfy: -3.54 ≤ F8 / F ≤ -2.03.

[0072] In an exemplary embodiment, the optical lens according to this application satisfies: 0.4 ≤ R91 / R92 ≤ 0.8, where R91 is the radius of curvature of the object-side surface of the ninth lens, and R92 is the radius of curvature of the image-side surface of the ninth lens. By controlling the ratio of the radius of curvature of the object-side surface to the radius of curvature of the image-side surface of the ninth lens within this range, it is beneficial to smooth the incident light rays and reduce the risk of strong energy ghosting caused by off-axis edge rays. More specifically, R91 and R92 can further satisfy: 0.55 ≤ R91 / R92 ≤ 0.71.

[0073] In an exemplary embodiment, the optical lens according to this application satisfies: 1.1 ≤ F9 / F ≤ 1.8, where F9 is the effective focal length of the ninth lens and F is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the ninth lens to the total effective focal length of the optical lens within this range, the focal length value of the ninth lens is reasonably allocated to correct the residual aberrations of the system, which is beneficial to achieving high image quality; it is also beneficial to achieving low distortion imaging.

[0074] In an exemplary embodiment, the optical lens according to this application satisfies: 0 ≤ F45 / F ≤ 60.15, where F45 is the combined effective focal length of the fourth and fifth lenses, and F is the total effective focal length of the optical lens. By controlling the ratio of the combined effective focal length of the fourth and fifth lenses to the total effective focal length of the optical lens within this range, the focal length values ​​of the cemented doublet lenses are reasonably allocated, enabling the combined lens to compensate for the on-axis chromatic aberration generated by the front lens group (first to third lenses), which is beneficial for achieving high image quality; it also helps to reduce system assembly tolerances.

[0075] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 2.71 ≤ Fb / F ≤ 7.42, where Fb is the combined effective focal length of the rear lens group (the fourth to the ninth lens), and F is the total effective focal length of the optical lens. By controlling the ratio of the combined effective focal length of the fourth to the ninth lens to the total effective focal length of the optical lens within this range, the combined focal length values ​​of the fourth to the ninth lens are reasonably allocated, allowing light rays from each field of view to smoothly transition to the rear of the optical system, which is beneficial for achieving large target surface imaging; at the same time, it can effectively balance spherical aberration, astigmatism, and coma, which is beneficial for achieving high image quality.

[0076] In an exemplary embodiment, the optical lens according to this application satisfies: 1.85 ≤ ND3 ≤ 2.01, where ND3 is the refractive index of the third lens. By reasonably setting the refractive index of the third lens, the third lens can preferably be made of a material with a higher refractive index, reducing surface curvature and decreasing aberrations, which is beneficial for achieving high image quality.

[0077] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 60 ≤ VD5 ≤ 95, where VD5 is the Abbe number of the fifth lens. By reasonably setting the Abbe number of the fifth lens, a material with a larger Abbe number can be preferred for the fifth lens, which is beneficial for chromatic aberration and high / low temperature correction, and helps to ensure that the lens remains in focus within a temperature range of -30℃ to 70℃.

[0078] In an exemplary embodiment, the optical lens according to this application satisfies: 2.1 ≤ F / ENPD ≤ 2.3, where F is the total effective focal length of the optical lens and ENPD is the entrance pupil diameter of the optical lens. By controlling the ratio of the total effective focal length to the entrance pupil diameter of the optical lens within this range, the system has a smaller aperture value, which is beneficial for achieving a large aperture.

[0079] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 0.3 ≤ Dmax / TTL ≤ 0.5, where Dmax is the maximum aperture of the optical lens, and TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens, i.e., the total optical length of the lens. By controlling the ratio of the maximum aperture of the optical lens to the total optical length of the lens within this range, and given a certain total optical length of the system, controlling the maximum aperture of the system results in a smaller maximum aperture, which is beneficial for miniaturization.

[0080] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 0.04 ≤ BFL / TTL ≤ 0.2, where BFL is the distance on the optical axis from the center of the image-side surface of the ninth lens to the imaging surface of the optical lens, i.e., the system's optical back focal length, and TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens, i.e., the total optical length of the lens. By controlling the ratio of the system's optical back focal length to the total optical length of the system within this range, the system's optical back focal length is reasonably controlled while achieving miniaturization, improving the ease of assembly and use of the lens, and also helping to reserve space for the installation of optical components.

[0081] In an exemplary embodiment, the optical lens of this application may further include a filter and / or protective glass disposed between the ninth lens and the imaging plane, as needed. The filter can filter light with a specific wavelength, and the protective glass can prevent damage to the image-side elements (e.g., chips) of the optical lens.

[0082] On one hand, the optical lens provided according to the exemplary embodiment of this application includes a first to a ninth lens arranged sequentially from the object side to the image side along the optical axis, wherein the first, fourth, sixth, and eighth lenses all have negative optical power, the third, fifth, seventh, and ninth lenses all have positive optical power, and the second lens may have positive or negative optical power; the effective focal length F3 of the third lens and the total effective focal length F of the lens satisfy the condition 0.7≤F3 / F≤1.2. By setting the optical lens as described above, the focal length value of the third lens is reasonably allocated, and combined with a high refractive index material, the spherical aberration generated by the preceding optical system can be corrected, which is beneficial to achieving high image quality; at the same time, it is beneficial for the lens to have one or more characteristics such as short total optical length, good thermal stability, high resolution, low distortion, high illumination, and large target surface.

[0083] On the other hand, the optical lens provided according to the exemplary embodiment of this application includes first to ninth lenses arranged sequentially from the object side to the image side along the optical axis, wherein the first, fourth, sixth, and eighth lenses all have negative optical power, the third, fifth, seventh, and ninth lenses all have positive optical power, and the second lens may have positive or negative optical power; the combined effective focal length Fb of the rear lens group (fourth to ninth lenses) and the total effective focal length F of the lens satisfy the condition 2.71≤Fb / F≤7.42. By setting the optical lens as described above, the combined focal length values ​​of the fourth to ninth lenses are reasonably allocated, so that the light rays from each field of view smoothly transition to the rear of the optical system, which is beneficial for achieving large target surface imaging; at the same time, it can effectively balance spherical aberration, astigmatism, and coma, which is beneficial for achieving high image quality; and it is also beneficial for the lens to have one or more characteristics such as short total optical length, good thermal stability, high resolution, low distortion, and high illumination.

[0084] Furthermore, the optical lens provided according to the exemplary embodiment of this application includes a first to a ninth lens arranged sequentially along the optical axis from the object side to the image side. The first, fourth, sixth, and eighth lenses all have negative optical power, while the third, fifth, seventh, and ninth lenses all have positive optical power. The second lens may have either positive or negative optical power. The effective focal length F8 of the eighth lens and the total effective focal length F of the optical lens satisfy the condition -3.84 ≤ F8 / F ≤ -1.73. By rationally allocating the focal length value of the eighth lens through the above-described arrangement of the optical lens, the coma and astigmatism of the optical system are balanced, which is beneficial for achieving high image quality and low distortion imaging. Simultaneously, it is beneficial for the lens to possess one or more characteristics such as short total optical length, good thermal stability, high resolution, high illumination, and a large target surface.

[0085] The optical lens according to the embodiments of this application can employ multiple lenses, such as the nine lenses mentioned above. By rationally setting, for example, some parameters of the lens, such as optical power, surface shape, radius of curvature, refractive index, and Abbe number, the lens can possess some or all of the characteristics such as short overall optical length, good thermal stability, high resolution, low distortion, high illumination, and the ability to achieve a large target surface. For example, the full field of view illumination of the optical lens can meet ≥60%; the optical lens can achieve clear and stable imaging in an ambient temperature range of -30℃ to 70℃; at a half field of view H = 5.5mm, the optical distortion of the lens can meet: |Optical Distortion| ≤ 2.1%; the principal ray incident angle CRA of the lens can meet: CRA < 13°; the target surface size of the lens can meet ≥ 1 / 1.55"; and the lens can meet resolution requirements of 1200W or more, etc.

[0086] However, those skilled in the art will understand that the number of lenses constituting the lens can be varied to obtain the various results and advantages described in this specification without departing from the technical solutions claimed in this application. For example, although ten lenses are described as an example in the embodiments, the optical lens is not limited to including ten lenses. If desired, the optical lens may also include other numbers of lenses. Specific embodiments of the optical lens applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0087] Example 1

[0088] Figure 1 This is a schematic diagram of the optical lens according to Embodiment 1 of this application, as shown below. Figure 1 The optical lens according to Embodiment 1 of this application is described.

[0089] like Figure 1 As shown, the optical lens, along the optical axis from the object side to the image side, includes, in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a filter and / or protective glass C, and an imaging plane (IMA). Among these, the fourth lens L4 and the fifth lens L5 are cemented doublet lenses.

[0090] In this embodiment, the first lens L1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens L4 has negative optical power, its object-side surface S8 is convex, and its image-side surface S9 is concave. The fifth lens L5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens L6 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens L7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex. The eighth lens L8 has negative optical power, its object-side surface S15 is convex, and its image-side surface S16 is concave. The ninth lens L9 has positive optical power, with its object side S17 being convex and its image side S18 being concave.

[0091] In this embodiment, the second lens L2, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are aspherical lenses. The aperture stop STO of the optical lens is located between the third lens L3 and the fourth lens L4. The distortion of the optical lens in this embodiment is -1.12%; the half field of view is 28.042°; and the half image height is 5.50mm.

[0092] In this embodiment, the filter and / or protective glass C located between the ninth lens L9 and the imaging surface has an object-side surface S19 and an image-side surface S20. Light from the object can, for example, pass sequentially through each surface S1 to S20 and finally be imaged on the imaging surface IMA, wherein an image sensing chip may be disposed at the imaging surface, for example.

[0093] Table 1 shows the radius of curvature R, thickness d, refractive index ND, and Abbe number VD of each lens in the optical lens of Example 1.

[0094]

[0095]

[0096] Table 1

[0097] In this embodiment, the object-side and image-side surfaces of the second lens L2, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0098]

[0099] in, x Let be the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; 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; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A18 that can be used for each aspherical mirror S3-S4, S11-S18 in Example 1. 10 A 12 A 14 and A 16 .

[0100] Face number k A4 A6 A8 A10 A12 A14 A16 S3 0.574 3.39E-04 -6.65E-06 3.79E-06 -4.91E-07 3.56E-08 -1.36E-09 2.25E-11 S4 0.032 1.95E-04 -4.68E-06 1.00E-06 6.99E-09 -1.18E-08 8.77E-10 -1.98E-11 S11 3.231 -3.18E-03 6.85E-05 -6.92E-06 9.74E-07 -1.79E-07 1.67E-08 -6.78E-10 S12 0.655 -5.22E-03 6.68E-05 -2.05E-06 -1.17E-06 1.07E-07 -6.18E-09 -9.71E-11 S13 7.572 -1.65E-03 -1.40E-04 2.04E-05 -2.45E-06 1.71E-07 -4.25E-09 -3.57E-11 S14 -61.753 -2.92E-03 -8.17E-05 1.19E-05 -7.73E-07 1.34E-08 1.19E-09 -5.35E-11 S15 -14.401 5.48E-04 -3.45E-04 1.54E-05 -4.85E-07 1.60E-08 -5.88E-10 9.73E-12 S16 -9.035 -9.26E-04 -9.90E-05 -3.52E-06 4.80E-07 -2.19E-08 5.35E-10 -4.87E-12 S17 -5.782 -3.30E-03 5.11E-06 6.50E-06 -4.76E-07 2.16E-09 6.88E-10 -1.55E-11 S18 -8.781 -3.00E-03 2.44E-05 4.09E-06 -1.83E-07 -2.49E-10 1.43E-10 -2.35E-12

[0101] Table 2

[0102] Figure 2 The distortion curve of the optical lens according to Embodiment 1 of this application is shown. Figure 3 It is shown that according to this application

[0103] The relative illumination curve of the optical lens in Example 1 is derived from... Figure 2 and Figure 3 As can be seen, the optical lens according to Embodiment 1 of this application has the characteristics of low distortion and high illumination, and can achieve good imaging quality.

[0104] Example 2

[0105] Figure 4 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown below, with reference to the following. Figure 4 This paper describes an optical lens according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments.

[0106] like Figure 4 As shown, the optical lens, along the optical axis from the object side to the image side, includes, in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a filter and / or protective glass C, and an imaging plane (IMA). Among these, the fourth lens L4 and the fifth lens L5 are cemented doublet lenses.

[0107] In this embodiment, the first lens L1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 has negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens L4 has negative optical power, its object-side surface S8 is convex, and its image-side surface S9 is concave. The fifth lens L5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens L6 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens L7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex. The eighth lens L8 has negative optical power, its object-side surface S15 is convex, and its image-side surface S16 is concave. The ninth lens L9 has positive optical power, with its object side S17 being convex and its image side S18 being concave.

[0108] In this embodiment, the optical lens has a distortion of -1.17%; a half field of view of 27.805°; and a half image height of 5.50mm.

[0109] Table 3 shows the radius of curvature R, thickness d, refractive index ND, and Abbe number VD of each lens in the optical lens of Example 2.

[0110]

[0111]

[0112] Table 3

[0113] In this embodiment, the object-side and image-side surfaces of the second lens L2, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are all aspherical surfaces, and the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. Table 4 gives the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S3-S4, S11-S18 in this embodiment. 10 A 12 A 14 and A 16 .

[0114] Face number k A4 A6 A8 A10 A12 A14 A16 S3 0.233 6.31E-04 3.73E-06 3.43E-06 -4.80E-07 3.81E-08 -1.63E-09 3.10E-11 S4 -0.287 3.19E-04 6.04E-07 9.87E-07 3.98E-09 -1.17E-08 8.94E-10 -2.02E-11 S11 3.373 -2.44E-03 -3.17E-06 -7.20E-06 1.05E-06 -1.92E-07 1.65E-08 -6.79E-10 S12 0.564 -4.75E-03 -2.81E-05 1.96E-06 -1.39E-06 8.55E-08 -1.96E-09 -5.39E-11 S13 -3.481 -2.10E-03 -1.65E-04 2.07E-05 -2.33E-06 1.58E-07 -5.55E-09 4.00E-10 S14 -27.569 -2.49E-03 -8.88E-05 9.17E-06 -5.37E-07 1.76E-08 4.93E-11 2.46E-11 S15 -17.298 8.18E-04 -3.25E-04 1.54E-05 -6.05E-07 1.68E-08 -1.59E-10 -3.07E-12 S16 -9.589 -9.10E-04 -8.38E-05 -4.75E-06 4.83E-07 -2.08E-08 5.53E-10 -5.89E-12 S17 -6.011 -2.59E-03 -6.32E-05 8.23E-06 -4.75E-07 7.77E-10 6.81E-10 -1.39E-11 S18 -8.825 -2.70E-03 -1.60E-05 4.76E-06 -1.62E-07 -1.21E-10 8.66E-11 -1.13E-12

[0115] Table 4

[0116] Figure 5 The distortion curve of the optical lens according to Embodiment 2 of this application is shown. Figure 6 The diagram shows the relative illumination curve of the optical lens according to Embodiment 2 of this application. Figure 5 and Figure 6 As can be seen, the optical lens according to Embodiment 2 of this application has the characteristics of low distortion and high illumination, and can achieve good imaging quality.

[0117] Example 3

[0118] Figure 7 A schematic diagram of the optical lens according to Embodiment 3 of this application is shown below, with reference to the following. Figure 7 The optical lens according to Embodiment 3 of this application is described.

[0119] like Figure 7 As shown, the optical lens, along the optical axis from the object side to the image side, includes, in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a filter and / or protective glass C, and an imaging plane (IMA). Among these, the fourth lens L4 and the fifth lens L5 are cemented doublet lenses.

[0120] In this embodiment, the first lens L1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 has negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens L4 has negative optical power, its object-side surface S8 is convex, and its image-side surface S9 is concave. The fifth lens L5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens L6 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens L7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex. The eighth lens L8 has negative optical power, its object-side surface S15 is convex, and its image-side surface S16 is concave. The ninth lens L9 has positive optical power, with its object side S17 being convex and its image side S18 being concave.

[0121] In this embodiment, the optical lens has a distortion of -1.02%; a half field of view of 27.786°; and a half image height of 5.50mm.

[0122] Table 5 shows the radius of curvature R, thickness d, refractive index ND, and Abbe number VD of each lens in the optical lens of Example 3.

[0123]

[0124] Table 5

[0125] In this embodiment, the object-side and image-side surfaces of the second lens L2, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are all aspherical surfaces, and the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. Table 6 gives the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S3-S4, S11-S18 in this embodiment. 10 A 12 A 14 and A 16 .

[0126]

[0127]

[0128] Table 6

[0129] Figure 8 The distortion curve of the optical lens according to Embodiment 3 of this application is shown. Figure 9 The diagram shows the relative illumination curve of the optical lens according to Embodiment 3 of this application. Figure 8 and Figure 9As can be seen, the optical lens according to Embodiment 3 of this application has the characteristics of low distortion and high illumination, and can achieve good imaging quality.

[0130] Example 4

[0131] Figure 10 A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown below, with reference to the following. Figure 10 The optical lens according to Embodiment 4 of this application is described.

[0132] like Figure 10 As shown, the optical lens, along the optical axis from the object side to the image side, includes, in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a filter and / or protective glass C, and an imaging plane (IMA). Among these, the fourth lens L4 and the fifth lens L5 are cemented doublet lenses.

[0133] In this embodiment, the first lens L1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens L4 has negative optical power, its object-side surface S8 is convex, and its image-side surface S9 is concave. The fifth lens L5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens L6 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens L7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex. The eighth lens L8 has negative optical power, its object-side surface S15 is convex, and its image-side surface S16 is concave. The ninth lens L9 has positive optical power, with its object side S17 being convex and its image side S18 being concave.

[0134] In this embodiment, the optical lens has a distortion of -2.06%; a half field of view of 27.879°; and a half image height of 5.50mm.

[0135] Table 7 shows the radius of curvature R, thickness d, refractive index ND, and Abbe number VD of each lens in the optical lens of Example 4.

[0136]

[0137]

[0138] Table 7

[0139] In this embodiment, the object-side and image-side surfaces of the second lens L2, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are all aspherical surfaces, and the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. Table 8 gives the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S3-S4, S11-S18 in this embodiment. 10 A 12 A 14 and A 16 .

[0140] Face number k A4 A6 A8 A10 A12 A14 A16 S3 2.442 -3.88E-04 -9.52E-06 3.98E-06 -5.68E-07 4.70E-08 -2.19E-09 4.46E-11 S4 0.921 -2.70E-04 6.35E-06 -7.36E-07 1.89E-07 -1.94E-08 8.50E-10 -1.27E-11 S11 2.028 -3.69E-03 2.32E-05 -5.25E-06 1.18E-06 -2.44E-07 2.22E-08 -9.35E-10 S12 0.153 -6.09E-03 -2.32E-06 8.30E-06 -1.68E-06 6.94E-08 7.10E-09 -6.48E-10 S13 52.863 -2.04E-03 -1.37E-04 2.63E-05 -2.59E-06 1.83E-07 4.01E-09 -4.69E-10 S14 -99.000 -3.10E-03 3.74E-05 6.16E-06 -3.63E-07 2.81E-08 -1.96E-10 -1.25E-11 S15 -11.953 7.42E-04 -3.14E-04 1.60E-05 -5.68E-07 1.57E-08 -4.04E-10 1.00E-11 S16 -9.420 -1.06E-03 -7.97E-05 -4.28E-06 4.87E-07 -2.15E-08 5.40E-10 -4.70E-12 S17 -6.068 -2.30E-03 -4.72E-05 7.51E-06 -4.12E-07 1.09E-09 5.62E-10 -1.17E-11 S18 -11.523 -2.26E-03 -6.19E-05 8.90E-06 -2.64E-07 -2.27E-09 2.25E-10 -2.89E-12

[0141] Table 8

[0142] Figure 11 The distortion curve of the optical lens according to Embodiment 4 of this application is shown. Figure 12 The diagram shows the relative illumination curve of the optical lens according to Embodiment 4 of this application. Figure 11 and Figure 12 As can be seen, the optical lens according to Embodiment 4 of this application has the characteristics of low distortion and high illumination, and can achieve good imaging quality.

[0143] In summary, Examples 1 to 4 satisfy the relationships shown in Table 9 below.

[0144]

[0145]

[0146] Table 9

[0147] This application also provides an electronic device that may include an optical lens according to the above embodiments of this application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0148] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, Along the optical axis from the object side to the image side, the following are included in sequence: The first lens with negative optical power has a convex object side and a concave image side. A second lens with positive or negative optical power has a concave object side and a convex image side. A third lens with positive optical power has a convex object side and a concave image side. The fourth lens with negative optical power has a convex object side and a concave image side. The fifth lens with positive optical power has a convex object-side surface and a convex image-side surface; The sixth lens with negative optical power has a convex object side and a concave image side. The seventh lens with positive optical power has a convex object-side surface and a convex image-side surface. An eighth lens with negative optical power has a convex object-side surface and a concave image-side surface; and The ninth lens with positive optical power has a convex object side and a concave image side. Wherein, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 0.905≤F3 / F≤1.009, and the effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy: 0.4≤F5 / F≤0.8; The optical lens has nine lenses with optical power.

2. The optical lens according to claim 1, characterized in that, The fourth lens and the fifth lens are cemented doublet lenses bonded together.

3. The optical lens according to any one of claims 1 to 2, characterized in that, The effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: -1.6≤F1 / F≤-1.

14.

4. The optical lens according to any one of claims 1 to 2, characterized in that, The radius of curvature R21 of the object side of the second lens and the total effective focal length F of the optical lens satisfy: -1.1≤R21 / F≤-0.

5.

5. The optical lens according to any one of claims 1 to 2, characterized in that, The effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy the following condition: -0.9≤F4 / F≤-0.

4.

6. The optical lens according to any one of claims 1 to 2, characterized in that, The effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy the following condition: -2.33≤F6 / F≤-1.

7.

7. The optical lens according to any one of claims 1 to 2, characterized in that, The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy the following condition: 0.41≤F7 / F≤8.

69.

8. The optical lens according to any one of claims 1 to 2, characterized in that, The effective focal length F8 of the eighth lens and the total effective focal length F of the optical lens satisfy the following condition: -3.84≤F8 / F≤-1.

73.

9. The optical lens according to any one of claims 1 to 2, characterized in that, The radius of curvature R91 of the object side of the ninth lens and the radius of curvature R92 of the image side of the ninth lens satisfy: 0.4≤R91 / R92≤0.

8.

10. The optical lens according to any one of claims 1 to 2, characterized in that, The effective focal length F9 of the ninth lens and the total effective focal length F of the optical lens satisfy the following condition: 1.369≤F9 / F≤1.

479.

11. The optical lens according to any one of claims 1 to 2, characterized in that, The combined effective focal length F45 of the fourth lens and the fifth lens and the total effective focal length F of the optical lens satisfy the following condition: 3.488≤F45 / F≤40.

183.

12. The optical lens according to any one of claims 1 to 2, characterized in that, The combined effective focal length Fb of the fourth to the ninth lenses and the total effective focal length F of the optical lens satisfy the following condition: 3.496 ≤ Fb / F ≤ 6.

634.

13. The optical lens according to any one of claims 1 to 2, characterized in that, The refractive index ND3 of the third lens satisfies: 1.85≤ND3≤2.

01.

14. The optical lens according to any one of claims 1 to 2, characterized in that, The Abbe number VD5 of the fifth lens satisfies: 60≤VD5≤95.

15. The optical lens according to any one of claims 1 to 2, characterized in that, The total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following condition: 2.1≤F / ENPD≤2.

3.

16. The optical lens according to any one of claims 1 to 2, characterized in that, The maximum aperture Dmax of the optical lens and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following: 0.417≤Dmax / TTL≤0.

431.

17. The optical lens according to any one of claims 1 to 2, characterized in that, The distance BFL from the center of the image side of the ninth lens to the imaging surface of the optical lens on the optical axis and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following condition: 0.097≤BFL / TTL≤0.

101.

18. The optical lens according to any one of claims 1 to 2, characterized in that, The optical lens satisfies at least one of the following conditions: -1.496≤F1 / F≤-1.217;-1.007≤R21 / F≤-0.632;-0.691≤F4 / F≤-0.599;0.608≤F5 / F≤0.626;-2.229≤F6 / F≤-1.858;1.793≤F7 / F≤7.303;-3.489≤F8 / F≤-2.087;0.601≤R91 / R92≤0.659; Wherein, F1 is the effective focal length of the first lens, R21 is the radius of curvature of the object side of the second lens, F4 is the effective focal length of the fourth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, R91 is the radius of curvature of the object side of the ninth lens, and R92 is the radius of curvature of the image side of the ninth lens.

Images