Optical lens

Abstract

The utility model discloses an optical lens. The optical lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, the second lens has negative focal power; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has negative focal power; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; the eighth lens has negative focal power, and the object side surface of the eighth lens is a concave surface; and the ninth lens has negative focal power, and the object side surface and the image side surface of the ninth lens are concave surfaces.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to an optical lens. Background Art

[0002] Machine vision inspection technology has the advantages of high efficiency, non-contact, and high accuracy, and is increasingly widely used in the fields of industry, agriculture, medicine, robot navigation, satellite remote sensing, etc. Machine vision lenses are the core components responsible for imaging in machine vision and are an indispensable part of the machine vision industry chain. The quality of the lens directly affects the overall performance of the vision system.

[0003] Nowadays, people have put forward higher requirements for machine vision lenses, for example: 1) The resolution of traditional machine vision lenses is difficult to use for the identification of textiles and small objects of similar size, so high resolution is required for the lens; 2) The assembly of machine vision lenses needs to consider the size of the site, so a wide working distance is required for the lens; 3) Considering the night use scene, the infrared performance of the lens is required; 4) In order to meet the measurement accuracy and reduce the difficulty of later identification, low distortion is required for the lens; 5) In order to provide a wider field of view at the same focal length, a large target surface is required for the lens. In other words, the current traditional machine vision lenses still have problems such as low resolution, narrow working distance, poor infrared performance, large optical distortion and small target surface. Utility Model Content

[0004] The present application provides an optical lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with positive optical power; a fifth lens with negative optical power; a sixth lens with positive optical power, whose object side surface is concave and whose image side surface is convex; a seventh lens with positive optical power, whose object side surface is concave and whose image side surface is convex; an eighth lens with negative optical power, whose object side surface is concave; and a ninth lens with negative optical power, whose object side surface and image side surface are both concave.

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

[0006] In one embodiment, the effective focal length F1 of the first lens and the effective focal length F of the optical lens satisfy: 0.8≤F1 / F≤1.1.

[0007] In one embodiment, the effective focal length F2 of the second lens and the effective focal length F of the optical lens satisfy: -2.1≤F2 / F≤-1.3.

[0008] In one embodiment, the effective focal length F3 of the third lens and the effective focal length F of the optical lens satisfy: 2.5≤F3 / F≤2.9.

[0009] In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F of the optical lens satisfy: 12.0≤F4 / F≤14.5.

[0010] In one embodiment, the effective focal length F5 of the fifth lens and the effective focal length F of the optical lens satisfy: -7≤F5 / F≤-4.5.

[0011] In one embodiment, the effective focal length F6 of the sixth lens and the effective focal length F of the optical lens satisfy: 2.1≤F6 / F≤11.3.

[0012] In one embodiment, the effective focal length F7 of the seventh lens and the effective focal length F of the optical lens satisfy: 0.9≤F7 / F≤1.4.

[0013] In one embodiment, the effective focal length F8 of the eighth lens and the effective focal length F of the optical lens satisfy: -17.5≤F8 / F≤-2.4.

[0014] In one embodiment, the effective focal length F9 of the ninth lens and the effective focal length F of the optical lens satisfy: -0.7≤F9 / F≤-0.4.

[0015] In one embodiment, the maximum light-clearance full aperture Dmax of the optical lens and the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.4≤Dmax / TTL≤0.7.

[0016] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the effective focal length F of the optical lens satisfy: 1.4≤TTL / F≤1.6.

[0017] In one embodiment, the effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: 2.1≤F / ENPD≤2.4.

[0018] In one embodiment, the half image height H of the optical lens and the effective focal length F of the optical lens satisfy: 0.5≤H / F≤0.6.

[0019] In one embodiment, the combined focal length F12 of the first lens and the second lens and the effective focal length F of the optical lens satisfy: 1.6≤F12 / F≤1.8.

[0020] In one embodiment, the Abbe number VD2 of the second lens satisfies: 20≤VD2≤30.

[0021] In one embodiment, the Abbe number VD4 of the fourth lens satisfies: 90≤VD4≤100.

[0022] In one embodiment, the distance T45 from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis satisfies: 0 mm ≤ T45 ≤ 0.8 mm. The distance T45 from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0 ≤ T45 / TTL ≤ 0.1. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of the embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0024] Figure 1 is a schematic structural diagram of an optical lens according to Example 1 of the present application;

[0025] Figure 2 is a schematic structural diagram of an optical lens according to Embodiment 2 of the present application;

[0026] Figure 3 is a schematic structural diagram of an optical lens according to Embodiment 3 of the present application; and

[0027] Figure 4 Schematic diagram of the structure of an optical lens according to Example 4 of the present application. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numbers refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0030] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0031] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface 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 of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens.

[0032] It should also be understood that the terms "comprises", "including", "having", "includes" 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0033] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] The features, principles and other aspects of the present application are described in detail below.

[0036] In an exemplary embodiment, the optical lens includes, for example, nine lenses having 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. The nine lenses are arranged in sequence from the object side to the image side along the optical axis, and any two adjacent lenses from the first lens to the ninth lens may have a spacing distance therebetween.

[0037] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the image side of the ninth lens. Optionally, the photosensitive element disposed on the image side of the ninth lens may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0038] In an exemplary embodiment, the optical lens may further include an aperture for limiting the light beam to further improve the imaging quality of the optical lens. Exemplarily, the aperture may be disposed between the fourth lens and the fifth lens. However, it should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be disposed at other positions according to actual needs.

[0039] In an exemplary embodiment, the first lens has positive optical power and has the function of collecting light, so that the light emitted by the first lens is closer to the optical axis, which is beneficial to reducing the front port diameter of the optical lens.

[0040] In an exemplary embodiment, the first lens has positive optical power, and both the object side surface and the image side surface are convex surfaces. The object side surface and the image side surface share the optical power, which is beneficial to reducing the surface curvature and ensuring the processability of parts, reducing the generation of aberrations, reducing optical distortion, and achieving high image quality.

[0041] In an exemplary embodiment, the first lens and the second lens may form a cemented lens, wherein the first lens has positive optical power in the cemented lens and cooperates with the second lens to achieve apochromatism, which is beneficial to achieving infrared confocality.

[0042] In an exemplary embodiment, the second lens has negative optical power, and its object side surface and image side surface are both concave. The object side surface and the image side surface share the optical power, which is beneficial to reducing the surface curvature, reducing the generation of aberrations, and achieving high image quality.

[0043] In an exemplary embodiment, the second lens may be made of a low Abbe number material to reduce the generation of chromatic aberration, reduce the difficulty of correcting chromatic aberration of the optical lens, and facilitate achieving high image quality.

[0044] In an exemplary embodiment, the first lens and the second lens may form a cemented lens, which is beneficial for correcting optical lens chromatic aberration, improving lens color reproduction, and reducing tolerance sensitivity.

[0045] In an exemplary embodiment, the third lens has positive power, and its object side and image side are both convex, which is conducive to collecting light, increasing the amount of light passing, and improving relative illumination. By reasonably setting the power and surface shape of the third lens, it is conducive to controlling the trend of light, allowing the light to smoothly enter the system behind the aperture, which is conducive to achieving high image quality.

[0046] In an exemplary embodiment, the fourth lens has positive optical power and its object side surface is concave, which can reduce the incident angle of off-axis light on the image side surface of the fourth lens, which is beneficial to reducing the off-axis aberration generated by the optical lens.

[0047] In an exemplary embodiment, the fourth lens has positive refractive power, its object-side surface is concave, and its image-side surface is convex.

[0048] In an exemplary embodiment, the fourth lens may be made of an anomalous dispersion material to reduce chromatic aberration of the optical lens, which is beneficial to achieving infrared confocality.

[0049] In an exemplary embodiment, the fifth lens has negative optical power and its object side surface is concave, which can reduce the incident angle of off-axis light on the image side surface of the fifth lens, which is beneficial to reducing the off-axis aberration generated by the optical lens.

[0050] In an exemplary embodiment, the fifth lens has negative optical power, its object side surface is concave, and the image side surface can be concave or convex. The positive spherical aberration introduced by the image side surface can well correct the negative spherical aberration generated by the object side surface.

[0051] In an exemplary embodiment, the sixth lens has positive optical power, its object side surface is concave, and its image side surface is convex, which can reduce the incident angle of off-axis light on the image side surface of the sixth lens, which is beneficial to reducing the off-axis aberration generated by the optical lens.

[0052] In an exemplary embodiment, the sixth lens has positive refractive power, its object side surface is concave, and its image side surface is convex. The positive spherical aberration introduced by the image side surface can well correct the negative spherical aberration generated by the object side surface.

[0053] In an exemplary embodiment, the seventh lens has positive refractive power, and the seventh lens can share the refractive power of the sixth lens, play a role in converging light, so that light from each field of view can smoothly enter the rear, and further make the light trend transition smoothly.

[0054] In an exemplary embodiment, the seventh lens has positive refractive power, its object side surface is concave, and its image side surface is convex. The positive spherical aberration introduced by the image side surface can well correct the negative spherical aberration generated by the object side surface.

[0055] In an exemplary embodiment, the eighth lens has negative optical power, has a small light deflection ability for the light on the optical axis, and has a large light deflection ability for the light outside the optical axis, which is beneficial to increase the target surface.

[0056] In an exemplary embodiment, the eighth lens has negative optical power, and its object side surface is concave, and the image side surface can be concave or convex. When the image side surface of the eighth lens is concave, it is beneficial to correct the off-axis aberration of the optical lens, and when the image side surface of the eighth lens is convex, it is beneficial to reduce distortion, and at the same time, the light deflection change is small, which helps to reduce sensitivity.

[0057] In an exemplary embodiment, the negative distortion introduced by the image side surface of the eighth lens can well correct the positive distortion generated by the sixth lens and the seventh lens.

[0058] In an exemplary embodiment, the ninth lens has negative optical power, has a small light deflection ability for the light on the optical axis, and has a large light deflection ability for the light outside the optical axis, which is beneficial to increase the target surface.

[0059] In an exemplary embodiment, the ninth lens has negative optical power, and its object side and image side are both concave, and there may be recurvature on the object side and image side, which is conducive to increasing the main ray angle of the edge field of view to match the large target chip, and at the same time, it is conducive to making the structure of the optical lens compact. And through the reasonable setting of the optical power and surface shape of the ninth lens, it is conducive to correcting off-axis aberrations and reducing distortion, and achieving high image quality.

[0060] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.8≤F1 / F≤1.1, where F1 is the effective focal length of the first lens, and F is the effective focal length of the optical lens. Satisfying 0.8≤F1 / F≤1.1, by reasonably allocating the focal length value of the first lens, the incident light can be converged, so that the outgoing light of the first lens is close to the optical axis direction, which is conducive to reducing the front port diameter of the optical lens.

[0061] In an exemplary embodiment, the optical lens according to the present application may satisfy: -2.1≤F2 / F≤-1.3, where F2 is the effective focal length of the second lens, and F is the effective focal length of the optical lens. Satisfying -2.1≤F2 / F≤-1.3, by reasonably allocating the focal length value of the second lens, the second lens has a negative optical power in the cemented lens composed of the first lens and the second lens, which is beneficial to correcting the chromatic aberration of the optical lens, improving the color reproduction of the lens, and reducing the tolerance sensitivity.

[0062] In an exemplary embodiment, the optical lens according to the present application may satisfy: 2.5≤F3 / F≤2.9, where F3 is the effective focal length of the third lens, and F is the effective focal length of the optical lens. Satisfying 2.5≤F3 / F≤2.9 and reasonably allocating the focal length value of the third lens is conducive to controlling the light trend, allowing the light to smoothly enter the system behind the aperture, and is conducive to achieving high image quality.

[0063] In an exemplary embodiment, the optical lens according to the present application may satisfy: 12.0≤F4 / F≤14.5, where F4 is the effective focal length of the fourth lens, and F is the effective focal length of the optical lens. Satisfying 12.0≤F4 / F≤14.5, by reasonably allocating the focal length value of the fourth lens, the incident angle of off-axis light on the image side of the fourth lens can be reduced, and the aberration caused by the steep trend of light can be reduced, which is conducive to achieving high image quality.

[0064] In an exemplary embodiment, the optical lens according to the present application may satisfy: -7≤F5 / F≤-4.5, where F5 is the effective focal length of the fifth lens, and F is the effective focal length of the optical lens. Satisfying -7≤F5 / F≤-4.5, by reasonably allocating the focal length value of the fifth lens, the incident angle of off-axis light on the image side of the fifth lens can be reduced, which is conducive to reducing the off-axis aberration generated by the optical lens.

[0065] In an exemplary embodiment, the optical lens according to the present application may satisfy: 2.1≤F6 / F≤11.3, where F6 is the effective focal length of the sixth lens, and F is the effective focal length of the optical lens. Satisfying 2.1≤F6 / F≤11.3, by reasonably allocating the focal length value of the sixth lens, the incident angle of off-axis light on the image side of the sixth lens can be reduced, which is conducive to reducing the off-axis aberration generated by the optical lens.

[0066] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.9≤F7 / F≤1.4, where F7 is the effective focal length of the seventh lens and F is the effective focal length of the optical lens. Satisfying 0.9≤F7 / F≤1.4, by reasonably allocating the focal length value of the seventh lens, the optical power of the sixth lens can be shared, which plays a role in converging incident light, so that light from each field of view can smoothly enter the rear system, and further make the light trend smoothly transition.

[0067] In an exemplary embodiment, the optical lens according to the present application may satisfy: -17.5≤F8 / F≤-2.4, where F8 is the effective focal length of the eighth lens, and F is the effective focal length of the optical lens. Satisfying -17.5≤F8 / F≤-2.4, by reasonably allocating the focal length value of the eighth lens, it is beneficial to correct off-axis aberrations, and the negative distortion introduced by the eighth lens can well correct the positive distortion generated by the sixth lens and the seventh lens.

[0068] In an exemplary embodiment, the optical lens according to the present application may satisfy: -0.7≤F9 / F≤-0.4, where F9 is the effective focal length of the ninth lens and F is the effective focal length of the optical lens. Satisfying -0.7≤F9 / F≤-0.4 and reasonably allocating the focal length value of the ninth lens is conducive to correcting off-axis aberrations and reducing distortion, thereby achieving high image quality.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.4≤Dmax / TTL≤0.7, where Dmax is the maximum clear aperture of the optical lens, and TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis. When 0.4≤Dmax / TTL≤0.7 is satisfied, under the condition of a certain total optical length of the optical lens, the maximum clear aperture of the optical lens is controlled by the system, so that the maximum clear aperture of the optical lens is smaller, which is conducive to miniaturization.

[0070] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.4≤TTL / F≤1.6, wherein TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, and F is the effective focal length of the optical lens. When 1.4≤TTL / F≤1.6 is satisfied, under the condition of a certain focal length value of the optical lens, the total optical length of the optical lens is controlled so that the total optical length of the optical lens is small, which is conducive to miniaturization.

[0071] In an exemplary embodiment, the optical lens according to the present application may satisfy: 2.1≤F / ENPD≤2.4, where F is the effective focal length of the optical lens and ENPD is the entrance pupil diameter of the optical lens. Satisfying 2.1≤F / ENPD≤2.4 enables the optical lens to have a smaller aperture value, which is conducive to achieving a large aperture.

[0072] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤H / F≤0.6, where H is the half image height of the optical lens and F is the effective focal length of the optical lens. When 0.5≤H / F≤0.6 is satisfied, under a certain system focal length value, the half image height of the optical lens is controlled to meet the above range, which is conducive to the optical lens realizing the imaging characteristics of a larger target surface.

[0073] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.6≤F12 / F≤1.8, where F12 is the combined focal length of the first lens and the second lens, and F is the effective focal length of the optical lens. When 1.6≤F12 / F≤1.8 is satisfied, the optical lens apochromatism is achieved through a reasonable combined focal length value of the first lens and the second lens, which is conducive to achieving infrared confocality. At the same time, it is conducive to reducing the generation of various aberrations, achieving high image quality, and reducing tolerance sensitivity.

[0074] In an exemplary embodiment, the optical lens according to the present application may satisfy: 20≤VD2≤30, where VD2 is the Abbe number of the second lens. Satisfying 20≤VD2≤30, by reasonably setting the Abbe number of the second lens, the generation of chromatic aberration can be reduced, the difficulty of chromatic aberration correction of the optical lens is reduced, and it is conducive to achieving infrared confocal.

[0075] In an exemplary embodiment, the optical lens according to the present application may satisfy: 90≤VD4≤100, where VD4 is the Abbe number of the fourth lens. Satisfying 90≤VD4≤100 and reasonably setting the Abbe number of the fourth lens can reduce the generation of chromatic aberration, reduce the difficulty of chromatic aberration correction of the optical lens, and facilitate the realization of infrared confocal.

[0076] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0mm≤T45≤0.8mm, wherein T45 is the distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis. And the optical lens according to the present application also satisfies: 0≤T45 / TTL≤0.1, wherein TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis. Satisfying 0mm≤T45≤0.8mm and 0≤T45 / TTL≤0.1, by changing the distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis (i.e., changing the value of T45), clear imaging at different object distances can be achieved. The working distance range of the optical lens of the present application (i.e., object distance) can be from 0.3m to infinity. At the same time, by changing the value of T45, the infrared defocus amount can be corrected, which is conducive to achieving clear infrared focus and broadening the application scenarios of the present application. More specifically, T45 and TTL may further satisfy 0.05 mm ≤ T45 ≤ 0.8 mm and 0.001 ≤ T45 / TTL ≤ 0.1.

[0077] In an exemplary embodiment, in actual use, the optical lens of the present application can adjust in real time the distance from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis according to the change of the object distance. More specifically, the distance from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis can be changed in the range of 0 mm to 0.8 mm, so that the optical lens can achieve clear imaging in the range of object distance from 0.3 m to infinity.

[0078] In an exemplary embodiment, the optical lens of the present application may adopt a glass-plastic hybrid material. For example, a glass-plastic hybrid structure of 3 glass lenses and 6 plastic lenses may be adopted. By reasonably matching the optical focal length of each lens and the material of each lens, it can be possible to avoid defocusing within the temperature range of -20°C to 80°C, which is beneficial to improving the working stability of the optical lens. Furthermore, the optical lens of the present application may also adopt a plastic aspherical lens, which is beneficial to improving the imaging quality while reducing costs.

[0079] In an exemplary embodiment, the maximum imaging surface of the optical lens of the present application is φ12.4 mm, that is, the full image height of the optical lens of the present application is 12.4 mm.

[0080] MTF (Modulation Transfer Function) is a quantitative evaluation index of the optical performance of a lens, which is used to describe the contrast of light transmitted at different spatial frequencies, and its unit is line pairs per millimeter (lp / mm). In an exemplary embodiment, the MTF value of the full field of view of the optical lens of the present application is >0.1@417lp / mm.

[0081] In an exemplary embodiment, the optical lens of the present application has the characteristic of high resolution, and when the corresponding maximum imaging chip is 1 / 1.3", its pixels can reach 48 million.

[0082] In an exemplary embodiment, the full field distortion of the optical lens of the present application is <2%.

[0083] In an exemplary embodiment, as needed, the optical lens of the present application may further include a filter and / or a protective glass disposed between the ninth lens and the imaging plane. The filter may filter light with different wavelengths, and the protective glass may prevent damage to the image-side element (e.g., chip) of the optical lens.

[0084] In an exemplary embodiment, the first lens to the ninth lens may be a spherical lens or an aspherical lens. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on the imaging quality, the number of aspherical lenses can be increased, and even all lenses use aspherical lenses. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. Optionally, at least one of the object side and image side of each lens in the first lens to the ninth lens is an aspherical mirror surface. Optionally, the object side and image side of each lens in the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are all aspherical mirror surfaces, and the object side and image side of each lens in the first lens, the second lens and the fourth lens are spherical mirror surfaces.

[0085] The optical lens according to the above-mentioned embodiment of the present application may adopt multiple lenses, such as the nine lenses mentioned above. However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although nine lenses are described as an example in the embodiment, the optical lens is not limited to including nine lenses. If necessary, the optical lens may also include other numbers of lenses. The specific embodiments of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0086] Example 1

[0087] The following reference Figure 1 An optical lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0088] like Figure 1 As shown, the optical lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0089] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0090] The second lens L2 has negative refractive power, and its object-side surface S2 is concave, and its image-side surface S3 is concave.

[0091] The third lens L3 has positive refractive power, and its object-side surface S4 is convex, and its image-side surface S5 is convex.

[0092] The fourth lens L4 has positive refractive power, and its object-side surface S6 is concave, and its image-side surface S7 is convex.

[0093] The fifth lens L5 has negative refractive power, and its object-side surface S8 is concave and its image-side surface S9 is concave.

[0094] The sixth lens L6 has positive refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is convex.

[0095] The seventh lens L7 has positive refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is convex.

[0096] The eighth lens L8 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is concave.

[0097] The ninth lens L9 has negative refractive power, and its object-side surface S16 is concave, and its image-side surface S17 is concave.

[0098] The first lens L1 and the second lens L2 constitute a cemented lens.

[0099] The optical lens may further include a stop STO. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5. More specifically, the stop STO may be disposed on the image-side surface S7 of the fourth lens L4.

[0100] Optionally, the optical lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S18 and an image side surface S19. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object passes through each surface S1 to S19 in sequence and is finally imaged on the imaging surface IMA.

[0101] Table 1 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0102]

[0103]

[0104] Table 1

[0105] In this embodiment and the following embodiments, according to the optical lens of the present application, different object distances can be adapted by changing the distance on the optical axis from the image side of the fourth lens to the object side of the fifth lens, thereby widening the application scenarios of the optical lens. For example, as the object distance increases, the distance on the optical axis from the image side of the fourth lens to the object side of the fifth lens can be reduced to adapt. As an example, an optical lens that meets the parameters of Table 1 can be applied to a scene with an object distance of 0.75m. In an exemplary embodiment, the distance on the optical axis from the image side of the fourth lens to the object side of the fifth lens can be changed in the range of 0mm to 0.8mm, so that the optical lens can achieve clear imaging in the range of 0.3m to infinity.

[0106] Table 2 shows the value of the distance T45 on the optical axis from the image side of the fourth lens to the object side of the fifth lens when the object distance of the optical lens of Example 1 is infinity, 0.75m and 0.3m respectively, wherein the unit of the object distance of the optical lens is meter (m), and the unit of T45 is millimeter (mm). It should be supplemented that Table 2 is only illustrated by taking the object distance of the optical lens at infinity, 0.75m and 0.3m as examples. However, the present application is not limited thereto. In the range of the object distance of the optical lens from 0.3m to infinity, by changing the value of T45 to a corresponding value, clear imaging at different object distances can be achieved. At the same time, changing the value of T45 can correct the infrared defocus amount, which is conducive to achieving clear infrared focus.

[0107] Object distance 0.3 0.75 Infinity T45 0.71 0.33 0.10

[0108] Table 2

[0109] In Example 1, the object side surface and the image side surface of each of the first lens, the second lens and the fourth lens are spherical mirror surfaces. The object side surface and the image side surface of any one of the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0110]

[0111] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of 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 curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 3 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 and A 16 .

[0112]

[0113]

[0114] Table 3

[0115] Example 2

[0116] The following reference Figure 2 The optical lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 2 A schematic structural diagram of an optical lens according to Example 2 of the present application is shown.

[0117] like Figure 2 As shown, the optical lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0118] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0119] The second lens L2 has negative refractive power, and its object-side surface S2 is concave, and its image-side surface S3 is concave.

[0120] The third lens L3 has positive refractive power, and its object-side surface S4 is convex, and its image-side surface S5 is convex.

[0121] The fourth lens L4 has positive refractive power, and its object-side surface S6 is concave, and its image-side surface S7 is convex.

[0122] The fifth lens L5 has negative refractive power, and its object-side surface S8 is concave and its image-side surface S9 is concave.

[0123] The sixth lens L6 has positive refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is convex.

[0124] The seventh lens L7 has positive refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is convex.

[0125] The eighth lens L8 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is concave.

[0126] The ninth lens L9 has negative refractive power, and its object-side surface S16 is concave, and its image-side surface S17 is concave.

[0127] The first lens L1 and the second lens L2 constitute a cemented lens.

[0128] The optical lens may further include a stop STO. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5. More specifically, the stop STO may be disposed on the image-side surface S7 of the fourth lens L4.

[0129] Optionally, the optical lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S18 and an image side surface S19. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object passes through each surface S1 to S19 in sequence and is finally imaged on the imaging surface IMA.

[0130] Table 4 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0131]

[0132] Table 4

[0133] The optical lens satisfying the parameters of Table 4 can be applied to a scene with an object distance of 0.75 m. In an exemplary embodiment, the distance on the optical axis from the image side surface of the fourth lens to the object side surface of the fifth lens can be changed in the range of 0 mm to 0.8 mm, so that the optical lens can achieve clear imaging in the range of object distance of 0.3 m to infinity.

[0134] Table 5 shows the value of the distance T45 on the optical axis from the image side of the fourth lens to the object side of the fifth lens when the object distance of the optical lens of Example 2 is infinity, 0.75m and 0.3m respectively, wherein the unit of the object distance of the optical lens is meter (m), and the unit of T45 is millimeter (mm). It should be supplemented that Table 5 is only illustrated by taking the object distance of the optical lens at infinity, 0.75m and 0.3m as an example. However, the present application is not limited to this. In the range of the object distance of the optical lens from 0.3m to infinity, by changing the value of T45 to a corresponding value, clear imaging at different object distances can be achieved. At the same time, changing the value of T45 can correct the infrared defocus amount, which is conducive to achieving clear infrared focus.

[0135] Object distance 0.3 0.75 Infinity T45 0.72 0.34 0.10

[0136] Table 5

[0137] In Example 2, the object side surface and the image side surface of each lens in the first lens, the second lens and the fourth lens are spherical mirror surfaces. The object side surface and the image side surface of any lens in the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are aspherical surfaces. Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0138] Face number k A4 A6 A8 A10 A12 A14 A16 S4 -12.26 -6.05E-04 1.24E-05 1.64E-06 -2.44E-07 1.60E-08 -3.35E-10 -1.32E-12 S5 -12.80 -3.40E-04 3.61E-05 6.40E-07 -4.78E-07 5.18E-08 -1.61E-09 -8.38E-12 S8 85.00 -3.90E-03 -3.58E-05 5.70E-05 -1.92E-05 2.69E-06 -7.10E-08 -1.32E-08 S9 20.00 -7.60E-03 -3.20E-04 1.39E-04 -2.45E-05 2.32E-06 -3.10E-08 -3.76E-09 S10 77.58 -4.30E-03 -4.74E-04 2.15E-05 2.10E-05 -4.40E-06 3.31E-07 -3.85E-09 S11 -3.54 -4.00E-03 -4.29E-04 5.52E-05 4.88E-06 -1.24E-06 5.79E-08 3.86E-10 S12 84.80 -6.50E-03 -2.47E-04 5.55E-05 1.17E-06 -2.19E-07 7.99E-09 -1.33E-10 S13 2.45 -0.00455 5.40E-04 -4.99E-05 1.75E-06 2.86E-07 -1.27E-08 -6.13E-11 S14 85.00 -2.80E-04 9.93E-06 -3.50E-05 2.72E-06 -2.37E-08 -5.39E-09 1.02E-10 S15 9.47 4.60E-03 -5.77E-04 3.36E-05 -1.09E-06 1.91E-08 -1.41E-10 -2.30E-12 S16 -15.91 -3.43E-03 1.49E-04 -2.50E-06 3.79E-07 -1.51E-08 6.12E-11 6.08E-13 S17 1.74 -2.88E-03 4.43E-05 1.45E-06 -2.15E-07 8.33E-09 -1.90E-10 1.92E-13

[0139] Table 6

[0140] Example 3

[0141] The following reference Figure 3 An optical lens according to Example 3 of the present application is described. Figure 3 A schematic structural diagram of an optical lens according to Example 3 of the present application is shown.

[0142] like Figure 3 As shown, the optical lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0143] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0144] The second lens L2 has negative refractive power, and its object-side surface S2 is concave, and its image-side surface S3 is concave.

[0145] The third lens L3 has positive refractive power, and its object-side surface S4 is convex, and its image-side surface S5 is convex.

[0146] The fourth lens L4 has positive refractive power, and its object-side surface S6 is concave, and its image-side surface S7 is convex.

[0147] The fifth lens L5 has negative refractive power, and its object-side surface S8 is concave and its image-side surface S9 is concave.

[0148] The sixth lens L6 has positive refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is convex.

[0149] The seventh lens L7 has positive refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is convex.

[0150] The eighth lens L8 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is convex.

[0151] The ninth lens L9 has negative refractive power, and its object-side surface S16 is concave, and its image-side surface S17 is concave.

[0152] The first lens L1 and the second lens L2 constitute a cemented lens.

[0153] The optical lens may further include a stop STO. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5. More specifically, the stop STO may be disposed on the image-side surface S7 of the fourth lens L4.

[0154] Optionally, the optical lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S18 and an image side surface S19. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object passes through each surface S1 to S19 in sequence and is finally imaged on the imaging surface IMA.

[0155] Table 7 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0156]

[0157] Table 7

[0158] The optical lens meeting the parameters of Table 7 can be applied to a scene with an object distance of 0.75 m. In an exemplary embodiment, the distance on the optical axis from the image side surface of the fourth lens to the object side surface of the fifth lens can be changed in the range of 0 mm to 0.8 mm, so that the optical lens can achieve clear imaging in the range of object distance of 0.3 m to infinity.

[0159] Table 8 shows the value of the distance T45 on the optical axis from the image side of the fourth lens to the object side of the fifth lens when the object distance of the optical lens of Example 3 is infinity, 0.75m and 0.3m respectively, wherein the unit of the object distance of the optical lens is meter (m), and the unit of T45 is millimeter (mm). It should be supplemented that Table 8 is only illustrated by taking the object distance of the optical lens at infinity, 0.75m and 0.3m as an example. However, the present application is not limited to this. In the range of the object distance of the optical lens from 0.3m to infinity, by changing the value of T45 to a corresponding value, clear imaging at different object distances can be achieved. At the same time, changing the value of T45 can correct the infrared defocus amount, which is conducive to achieving infrared clear focus.

[0160] Object distance 0.3 0.75 Infinity T45 0.66 0.32 0.10

[0161] Table 8

[0162] In Example 3, the object side surface and the image side surface of each lens in the first lens, the second lens and the fourth lens are spherical mirror surfaces. The object side surface and the image side surface of any lens in the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are aspherical surfaces. Table 9 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0163] Face number k A4 A6 A8 A10 A12 S4 -9.54 -5.02E-04 1.41E-05 -6.20E-07 2.13E-08 4.76E-10 S5 28.56 -4.41E-04 4.47E-05 -3.48E-06 2.04E-07 -3.20E-09 S8 16.10 -2.50E-03 1.14E-04 -1.06E-05 2.17E-06 -1.35E-06 S9 85.00 -8.90E-03 6.27E-05 6.75E-05 -6.36E-06 9.37E-07 S10 33.29 -1.02E-02 -3.06E-04 2.07E-04 -3.10E-05 9.36E-07 S11 29.61 -8.20E-03 -3.52E-05 7.36E-05 -5.30E-06 -8.75E-08 S12 -85.00 -5.60E-03 -1.70E-04 -4.62E-06 5.79E-06 -2.77E-07 S13 0.33 -1.70E-03 6.84E-05 -8.19E-06 6.90E-07 -2.46E-09 S14 55.24 -2.20E-03 2.13E-05 -5.23E-06 7.35E-07 -5.58E-08 S15 71.05 -1.38E-04 -1.87E-04 1.40E-05 -6.52E-07 1.65E-08 S16 -0.89 -2.30E-03 4.64E-05 -5.54E-07 4.73E-07 -1.14E-08 S17 -85.00 -1.60E-03 4.50E-05 -1.79E-06 6.47E-08 -7.75E-10

[0164] Table 9

[0165] Example 4

[0166] The following reference Figure 4 An optical lens according to Example 4 of the present application is described. Figure 4 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0167] like Figure 4 As shown, the optical lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0168] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0169] The second lens L2 has negative refractive power, and its object-side surface S2 is concave, and its image-side surface S3 is concave.

[0170] The third lens L3 has positive refractive power, and its object-side surface S4 is convex, and its image-side surface S5 is convex.

[0171] The fourth lens L4 has positive refractive power, and its object-side surface S6 is concave, and its image-side surface S7 is convex.

[0172] The fifth lens L5 has negative refractive power, and its object-side surface S8 is concave, and its image-side surface S9 is convex.

[0173] The sixth lens L6 has positive refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is convex.

[0174] The seventh lens L7 has positive refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is convex.

[0175] The eighth lens L8 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is concave.

[0176] The ninth lens L9 has negative refractive power, and its object-side surface S16 is concave, and its image-side surface S17 is concave.

[0177] The first lens L1 and the second lens L2 constitute a cemented lens.

[0178] The optical lens may further include a stop STO. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5. More specifically, the stop STO may be disposed on the image-side surface S7 of the fourth lens L4.

[0179] Optionally, the optical lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S18 and an image side surface S19. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object passes through each surface S1 to S19 in sequence and is finally imaged on the imaging surface IMA.

[0180] Table 10 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the optical lens of Example 4, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0181]

[0182] Table 10

[0183] The optical lens satisfying the parameters of Table 11 can be applied to a scene with an object distance of 0.75 m. In an exemplary embodiment, the distance on the optical axis from the image side surface of the fourth lens to the object side surface of the fifth lens can be changed in the range of 0 mm to 0.8 mm, so that the optical lens can achieve clear imaging in the range of object distance of 0.3 m to infinity.

[0184] Table 11 shows the value of the distance T45 on the optical axis from the image side of the fourth lens to the object side of the fifth lens when the object distance of the optical lens of Example 4 is infinity, 0.75m and 0.3m respectively, wherein the unit of the object distance of the optical lens is meter (m), and the unit of T45 is millimeter (mm). It should be supplemented that Table 11 is only used as an example when the object distance of the optical lens is infinity, 0.75m and 0.3m. However, the present application is not limited to this. In the range of the object distance of the optical lens from 0.3m to infinity, by changing the value of T45 to a corresponding value, clear imaging at different object distances can be achieved. At the same time, changing the value of T45 can correct the infrared defocus amount, which is conducive to achieving infrared confocal.

[0185] Object distance 0.3 0.75 Infinity T45 0.63 0.31 0.10

[0186] Table 11

[0187] In Example 4, the object side surface and the image side surface of each lens in the first lens, the second lens and the fourth lens are spherical mirror surfaces. The object side surface and the image side surface of any lens in the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are aspherical surfaces. Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0188] Face number k A4 A6 A8 A10 A12 S4 -27.50 -5.47E-04 1.90E-05 -6.67E-07 1.53E-08 1.43E-09 S5 -11.45 -3.41E-04 4.67E-05 -3.92E-06 2.56E-07 -2.92E-09 S8 32.61 -2.70E-03 1.58E-04 -4.60E-05 7.96E-06 -1.01E-06 S9 -85.00 -7.52E-03 2.09E-04 -4.45E-05 1.13E-05 -1.98E-06 S10 -35.91 -9.20E-03 -3.44E-04 1.00E-04 -1.44E-05 9.16E-07 S11 29.39 -6.80E-03 -2.21E-04 6.79E-05 -3.45E-06 -6.56E-08 S12 -75.60 -6.10E-03 -7.09E-05 4.45E-06 3.98E-06 -2.11E-07 S13 0.16 -1.86E-03 6.60E-05 -9.02E-06 1.15E-06 -2.78E-08 S14 85.00 -4.94E-04 -9.92E-05 -2.75E-07 4.92E-07 -4.30E-08 S15 -76.98 2.00E-03 -2.56E-04 1.25E-05 -3.59E-07 3.73E-09 S16 -1.09 -8.07E-04 9.95E-06 -1.75E-06 3.79E-07 -1.06E-08 S17 -64.42 -1.40E-03 4.12E-05 -2.18E-06 6.34E-08 -5.13E-10

[0189] Table 12

[0190] In summary, Examples 1 to 4 respectively satisfy the relationship shown in Table 13 below.

[0191]

[0192]

[0193] Table 13

[0194] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical lens, characterized in that: The optical lens includes, in order from the object side to the image side along the optical axis: a first lens having positive optical power; a second lens having negative optical power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having negative optical power; a sixth lens having positive refractive power, whose object side surface is concave and image side surface is convex; The seventh lens has positive refractive power, and its object side surface is concave and its image side surface is convex; an eighth lens element having negative optical power, the object side surface of which is concave; and The ninth lens element has negative optical power and its object side surface and image side surface are both concave surfaces.

2. The optical lens according to claim 1, wherein: The optical lens satisfies any one of the following conditions: 0.8≤F1 / F≤1.1,-2.1≤F2 / F≤-1.3,2.5≤F3 / F≤2.9,12.0≤F4 / F≤14.5,-7≤F5 / F≤-4.5,2.1≤F6 / F≤11.3,0.9≤F7 / F≤1.4,-17.5≤F8 / F≤-2.4,-0.7≤F9 / F≤-0.4, Among them, F1 is the effective focal length of the first lens, the effective focal length of the optical lens is F, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third 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, and F9 is the effective focal length of the ninth lens.

3. The optical lens according to claim 1 or 2, wherein: The maximum full aperture Dmax of the optical lens and the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.4≤Dmax / TTL≤0.

7.

4. The optical lens according to claim 1 or 2, wherein: A distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and an effective focal length F of the optical lens satisfy the following conditions: 1.4≤TTL / F≤1.

6.

5. The optical lens according to claim 1 or 2, wherein: The effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: 2.1≤F / ENPD≤2.

4.

6. The optical lens according to claim 1 or 2, wherein: The half image height H of the optical lens and the effective focal length F of the optical lens satisfy: 0.5≤H / F≤0.

6.

7. The optical lens according to claim 1 or 2, wherein: The combined focal length F12 of the first lens and the second lens and the effective focal length F of the optical lens satisfy the following: 1.6≤F12 / F≤1.

8.

8. The optical lens according to claim 1 or 2, wherein: The optical lens satisfies any one of the following conditional formulas: 20≤VD2≤30, 90≤VD4≤100, Wherein, VD2 is the Abbe number of the second lens, and VD4 is the Abbe number of the fourth lens.

9. The optical lens according to claim 1 or 2, wherein: A distance T45 from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis satisfies: 0 mm ≤ T45 ≤ 0.8 mm; A distance T45 from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis and a distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0≤T45 / TTL≤0.

1.

10. The optical lens according to claim 1 or 2, wherein: The object side surface of the first lens is convex, and the image side surface is convex; The object side surface of the second lens is concave, and the image side surface is concave; The object side surface of the third lens is convex, and the image side surface is convex; The object side surface of the fourth lens is concave, and the image side surface is convex; The object side surface of the fifth lens is a concave surface.

Images