Optical lens

Abstract

The invention discloses an optical lens. The optical lens sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with negative focal power from an object side to an image side along an optical axis, the first lens has positive focal power, the second lens has positive focal power, the eighth lens has positive focal power, the ninth lens has positive focal power, the tenth lens has positive focal power, the eleventh lens has negative focal power, and the twelfth lens has positive focal power. The number of the lenses with focal power in the optical lens is twelve.

Description

Technical Field

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

[0002] With the rapid development of intelligent transportation, the market demand for surveillance cameras, as key environmental perception devices, has shown explosive growth.

[0003] At present, the intelligent transportation field has put forward more requirements for monitoring lenses, for example: 1) The traditional monitoring mode adopts a strong fill light near-infrared monitoring mode in a weak light environment. The strong fill light is easy to cause traffic accidents, so the weak fill light monitoring requirement is proposed; 2) In a weak light environment, the traditional monitoring mode has poor monitoring quality. In order to ensure that the monitoring picture is more realistic, the requirement of high-quality full-color monitoring picture around the clock is proposed; 3) In order to meet the full-color monitoring quality in a weak light environment, it is necessary to improve the aperture of the monitoring lens, and at the same time, using the characteristics of visible light and infrared light, it is proposed to fuse the two-way monitoring information to obtain excellent full-color monitoring picture quality, and at the same time, it is required that the ghost image is weak to avoid affecting the monitoring quality; 4) In order to meet the precise monitoring of the details of the monitoring environment, the advantage of the more delicate imaging of the large target chip is utilized, so the requirement of matching the large target chip is proposed.

[0004] In order to better meet the development needs of the intelligent traffic monitoring field, designing an optical lens that meets at least one of the above requirements has become a development direction for many lens manufacturers to enhance their competitiveness. Summary of the invention

[0005] On one hand, the present application provides an optical lens, which includes, from the object side to the image side along the optical axis, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with negative optical power, an eighth lens with positive optical power, a ninth lens with positive optical power, a tenth lens with positive optical power, an eleventh lens with negative optical power, and a twelfth lens with positive optical power. The number of lenses with optical power in the optical lens is twelve.

[0006] In one embodiment, the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is concave, and the image side surface is concave; the image side surface of the third lens is convex; the object side surface of the fourth lens is convex; the object side surface and the image side surface of the fifth lens are both convex; the object side surface and the image side surface of the sixth lens are both concave; the object side surface and the image side surface of the seventh lens are both concave; the object side surface and the image side surface of the eighth lens are both convex; the object side surface and the image side surface of the ninth lens are both convex; the object side surface of the tenth lens is convex; the image side surface of the eleventh lens is concave; and the object side surface and the image side surface of the twelfth lens are both convex.

[0007] In one embodiment, the optical lens satisfies: 1≤BFL / f≤2, where BFL is the back focus of the optical lens, and f is the effective focal length of the optical lens.

[0008] In one embodiment, the optical lens satisfies: 2≤fa / fb≤6, wherein fa is the combined effective focal length of the first lens to the sixth lens, and fb is the combined effective focal length of the seventh lens to the twelfth lens.

[0009] In one embodiment, the optical lens satisfies: -2≤f2 / f≤-1, wherein f2 is the effective focal length of the second lens, and f is the effective focal length of the optical lens.

[0010] In one embodiment, the optical lens satisfies: -1.5≤f6 / f<0, wherein f6 is the effective focal length of the sixth lens, and f is the effective focal length of the optical lens.

[0011] In one embodiment, the optical lens satisfies: -1≤f7 / f<0, wherein f7 is the effective focal length of the seventh lens, and f is the effective focal length of the optical lens.

[0012] In one embodiment, the optical lens satisfies: 1≤f8 / f≤2, wherein f8 is the effective focal length of the eighth lens, and f is the effective focal length of the optical lens.

[0013] In one embodiment, the optical lens satisfies: 1.5≤f9 / f≤2.5, wherein f9 is the effective focal length of the ninth lens, and f is the effective focal length of the optical lens.

[0014] In one embodiment, the optical lens satisfies: -2≤f11 / f≤-1, wherein f11 is the effective focal length of the eleventh lens, and f is the effective focal length of the optical lens.

[0015] In one embodiment, the optical lens satisfies: -3≤f78 / f≤-1, wherein f78 is the combined effective focal length of the seventh lens and the eighth lens, and f is the effective focal length of the optical lens.

[0016] In one embodiment, the optical lens satisfies: 0.3≤T67×(fa+fb) / (fa×fb)≤0.6, wherein T67 is the air distance between the sixth lens and the seventh lens on the optical axis, fa is the combined effective focal length of the first lens to the sixth lens, and fb is the combined effective focal length of the seventh lens to the twelfth lens.

[0017] In one embodiment, the optical lens satisfies at least one of the following conditions: 0.7≤IH / f≤1.2, 0.2≤Dmax / TTL≤0.4, 0.1≤f / TTL≤0.3, -4≤f1 / f≤-2, 1.5≤f3 / f≤3, 1.5≤f4 / f≤3, 1≤f5 / f≤2, 2≤f10 / f≤3, 1≤f12 / f≤2, -22≤f56 / f≤-4, -7≤f1011 / f≤-4, wherein IH is the maximum field of view of the optical lens The corresponding image height, f is the effective focal length of the optical lens, Dmax is the maximum clear aperture of the optical lens, TTL is the total optical length of the optical lens, f1 is the effective focal length of the first 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, f10 is the effective focal length of the tenth lens, f12 is the effective focal length of the twelfth lens, f56 is the combined effective focal length of the fifth lens and the sixth lens, and f1011 is the combined effective focal length of the tenth lens and the eleventh lens.

[0018] In one embodiment, the optical lens satisfies at least one of the following conditions: 1.35≤BFL / f≤1.7, 0.8≤IH / f≤1, 0.25≤Dmax / TTL≤0.35, 2.35≤fa / fb≤5.6, 0.15≤f / TTL≤0.2, -3.45≤f1 / f≤-2.3, -1.55≤f2 / f≤-1.3, 1.8≤f3 / f≤3, 1.85≤f4 / f≤2.8, 1.1≤f5 / f≤1.8, -1.4≤f6 / f ≤-0.85, -1≤f7 / f≤-0.7, 1.4≤f8 / f≤1.7, 1.7≤f9 / f≤2.2, 2.1≤f10 / f≤2.7, -1.66≤f11 / f≤-1.35, 1.45≤f12 / f≤2, -21.6≤f56 / f≤-4.5, -2.8≤f78 / f≤-1.7, -6.58≤f1011 / f≤-4.3, 0.35≤T67×(fa+fb) / (fa×fb)≤0.6, where BFL is the light The back focus of the optical lens, IH is the image height corresponding to the maximum field of view of the optical lens, f is the effective focal length of the optical lens, fa is the combined effective focal length of the first lens to the sixth lens, fb is the combined effective focal length of the seventh lens to the twelfth lens, Dmax is the maximum aperture of the optical lens, TTL is the total optical length of the optical lens, f1 is the effective focal length of the first lens, 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, and f6 is the effective focal length of the fourth lens. The effective focal length of the six lenses, f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, f9 is the effective focal length of the ninth lens, f10 is the effective focal length of the tenth lens, f11 is the effective focal length of the eleventh lens, f12 is the effective focal length of the twelfth lens, f56 is the combined effective focal length of the fifth lens and the sixth lens, f78 is the combined effective focal length of the seventh lens and the eighth lens, f1011 is the combined effective focal length of the tenth lens and the eleventh lens, and T67 is the air distance between the sixth lens and the seventh lens on the optical axis.

[0019] Another aspect of the present application provides an electronic device, which includes the optical lens provided by the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0020] The optical lens provided in the present application uses twelve lenses, and by reasonably setting the optical focal length of each lens, it is beneficial to achieve at least one beneficial effect of miniaturization, high resolution, large aperture, large target surface, real-time athermalization, low ghost images, and a wide object distance range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 is a schematic structural diagram of an optical lens according to Example 1 of the present application; Figure 2 is a distortion curve diagram of the optical lens according to Example 1 of the present application; Figure 3 is a Ray Fan diagram of the optical lens according to Example 1 of the present application; Figure 4 is a schematic structural diagram of an optical lens according to Embodiment 2 of the present application; Figure 5 is a distortion curve diagram of the optical lens according to Example 2 of the present application; Figure 6 is a Ray Fan diagram of the optical lens according to Example 2 of the present application; Figure 7 is a schematic structural diagram of an optical lens according to Example 3 of the present application; Figure 8 is a distortion curve diagram of the optical lens according to Example 3 of the present application; Fig. 9 is a Ray Fan diagram of the optical lens according to Example 3 of the present application; Fig.10 is a schematic structural diagram of an optical lens according to Example 4 of the present application; Fig.11 is a distortion curve diagram of the optical lens according to Example 4 of the present application; Fig.12 is a Ray Fan diagram of the optical lens according to Example 4 of the present application; Fig.13 is a schematic structural diagram of an optical lens according to Example 5 of the present application; Fig.14 is a distortion curve diagram of the optical lens according to Example 5 of the present application; Fig.15 is a Ray Fan diagram of the optical lens according to Example 5 of the present application; Fig.16 is a schematic structural diagram of an optical lens according to Example 6 of the present application; Fig.17 is a distortion curve diagram of the optical lens according to Example 6 of the present application; Fig.18 is a Ray Fan diagram of the optical lens according to Example 6 of the present application; Fig.19 is a schematic structural diagram of an optical lens according to Example 7 of the present application; Fig. 20 is a distortion curve diagram of the optical lens according to Example 7 of the present application; Fig.21 It is a Ray Fan diagram of the optical lens according to Example 7 of the present application. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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 judgment of the surface type in the paraxial region can be judged according to the general method in the art, for example, the positive and negative R value (R refers to the radius of curvature of the paraxial region) is used to judge the concave and convex. Exemplarily, when the optical lens provided in the present application is used for photography, 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. In terms of the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; in terms of the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0026] 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.

[0027] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with 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.

[0028] 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 features, principles and other aspects of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In an exemplary embodiment, the optical lens provided by the present application may include, for example, twelve 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, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens. The twelve lenses are arranged in sequence from the object side to the image side along the optical axis.

[0030] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the image side of the twelfth lens. Optionally, the photosensitive element disposed on the image side of the twelfth lens may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0031] 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 sixth lens and the seventh lens. Disposing the aperture here is conducive to forming a double Gaussian symmetrical structure of the lens or lens group before and after the aperture, thereby achieving the effect of using a wide range of object distances, while facilitating correction of aberrations, chromatic aberrations, and ensuring tolerance performance. 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.

[0032] In an exemplary embodiment, the optical lens may further include a prism for light splitting, and the prism may be disposed between the twelfth lens and the imaging surface. The prism splits visible light and infrared light through coating, and obtains imaging information respectively by using the color information of visible light and the brightness information of infrared light, and then fuses the two paths of light information through technical means to achieve all-weather high-quality color imaging.

[0033] In an exemplary embodiment, the first lens may have a negative optical power, with a convex object side and a concave image side. The optical power of the first lens is negative, which is beneficial for collecting light with a large field of view, while reducing the aperture of the lens head, which is beneficial for achieving a miniaturized volume. The object side of the first lens is convex, which is beneficial for reducing the incident angle of light with a large field of view on the object side, reducing the generation of monochromatic aberrations and distortion, and is beneficial for achieving high image quality and reducing distortion; the object side of the first lens is convex, which is also beneficial for diverging ghost image energy and reducing ghost image intensity. The image side of the first lens is concave, so that the trend of light entering the lens does not change drastically, and enters the second lens smoothly, reducing the generation of aberrations, and is beneficial for achieving high image quality and ensuring tolerance performance.

[0034] In an exemplary embodiment, the second lens may have a negative optical power, and its object side surface is concave and its image side surface is concave. The second lens is a negative lens, which can diverge the light beam collected by the first lens, which is conducive to achieving a large aperture; the second lens is a negative lens, which can also slowly increase the light of a large field of view, which is conducive to achieving a large target surface. The object side surface of the second lens is a concave surface, which can reduce the incident angle of the light, reduce the generation of monochromatic aberrations and distortions, and is conducive to achieving high image quality and reducing distortion. The image side surface of the second lens is a concave surface, which is conducive to diverging the light, reducing the exit angle of the light, making the light trend gentle, reducing the generation of spherical aberrations, and is conducive to achieving a large aperture, high image quality, and ensuring tolerance performance. The second lens is matched with a negative CTE (Coefficient of Thermal Expansion) material, which is conducive to achieving real-time athermalization function.

[0035] In an exemplary embodiment, the third lens may have a positive optical power, and its object side surface is convex or concave, and its image side surface is convex. The third lens is a positive lens, which focuses the light diverged by the first lens and the second lens, reduces the degree of light beam divergence, reduces the aperture of the subsequent lens, and is conducive to miniaturization. The object side surface of the third lens is concave or convex, which can reduce the incident angle of the light and reduce the generation of spherical aberration, which is conducive to achieving high image quality and ensuring tolerance performance. The image side surface of the third lens is convex, which can focus the light diverged by the first lens and the second lens, reduce the degree of light beam divergence, and make the trend of the outgoing light tend to be gentle, which is conducive to achieving a large aperture and miniaturization.

[0036] In an exemplary embodiment, the fourth lens may have a positive optical power, and its object side surface is a convex surface, and the image side surface is a convex surface or a concave surface. The fourth lens is a positive lens, which can focus the light rays diverged by the first lens and the second lens, so that the light beam changes from a divergent trend to a focusing trend, and reduces the subsequent lens and aperture diameter, which is conducive to miniaturization and reduces the generation of aperture aberration. The object side surface of the fourth lens is a convex surface, which can increase the focusing ability, change the light beam from a divergent trend to a parallel light trend, reduce the generation of spherical aberration, and is conducive to achieving high image quality and ensuring tolerance performance. The image side surface of the fourth lens is a convex surface or a concave surface, which can focus the light rays diverged by the first lens and the second lens, so that the light beam changes from a parallel light trend to a focusing trend, and the trend of the outgoing light rays tends to be gentle, which can reduce the optical path, which is conducive to achieving a large aperture and a miniaturized volume, and reducing the generation of aperture aberration.

[0037] In example embodiments, the fifth lens may have positive refractive power, with both object-side and image-side surfaces being convex.

[0038] In an exemplary embodiment, the sixth lens may have a negative optical power, and its object side and image side are both concave. The sixth lens is a double concave negative lens, which slowly raises the light of a large field of view, which is conducive to achieving a large target surface and reducing CRA (Chief Ray Angle). In addition, the image side of the sixth lens is a concave surface, which can change the trend of the focused light beam into a parallel light trend, which is conducive to achieving a large aperture, reducing aperture aberrations, and achieving high image quality.

[0039] In an exemplary embodiment, the fifth lens is a positive lens, and the sixth lens is a negative lens. The fifth lens and the sixth lens can form a double-cemented lens group to correct the chromatic aberration generated by the first lens to the fourth lens, and correct the chromatic aberration of the entire system at a position far away from the image plane, which is conducive to ensuring the consistency of the focal difference of visible light and infrared light at different object distances and the consistency of the image height difference of two different image heights, which is conducive to the fusion of visible light and infrared light images. The positive and negative optical power of the fifth lens and the sixth lens can be matched to correct spherical aberration, coma, and field curvature, reduce the monochromatic aberration of the first lens to the sixth lens set in front of the aperture, avoid the generation of aperture aberration, and help achieve high image quality and ensure tolerance performance. The fifth lens and the sixth lens can also choose reasonable positive and negative optical power, and match reasonable CTE materials, which is conducive to achieving real-time athermal function.

[0040] In example embodiments, the seventh lens may have negative power, with its object-side surface being concave and its image-side surface being concave.

[0041] In example embodiments, the eighth lens may have positive refractive power, with an object-side surface being convex and an image-side surface being convex.

[0042] In an exemplary embodiment, the seventh lens is a negative lens, the eighth lens is a positive lens, and the seventh lens and the eighth lens can form a double cemented lens group, which can correct the chromatic aberration of the entire system at a position far away from the image plane to avoid chromatic aberration of the seventh lens to the twelfth lens after the aperture, which is conducive to ensuring the consistency of the focal difference of visible light and infrared light at different object distances and the consistency of the image height difference of two different image heights, which is conducive to the fusion of visible light and infrared light images. The positive and negative focal powers of the seventh lens and the eighth lens are matched to correct spherical aberration, coma, and field curvature, avoid aberrations in the group after the aperture (the seventh lens to the twelfth lens), and are conducive to achieving high image quality and ensuring tolerance performance. Reasonable positive and negative focal powers can be selected for the seventh lens and the eighth lens, and materials with reasonable CTE are matched to achieve real-time athermalization function.

[0043] In an exemplary embodiment, the seventh lens is a double concave negative lens, which allows the light of a large field of view to rise slowly, which is conducive to achieving a large target surface and reducing CRA. The object side of the seventh lens is a concave surface, which changes the parallel light trend of the light beam into a divergent trend, which is conducive to lengthening the back focus of the lens.

[0044] In an exemplary embodiment, the image side surface of the eighth lens is convex, and its optical power is close to that of the object side surface of the seventh lens, so that the seventh lens and the eighth lens constitute an optical element with negative optical power, and the light trend is smooth, which is conducive to achieving achromatic aberration function while diverging the light and ensuring tolerance performance.

[0045] In an exemplary embodiment, the ninth lens may have positive optical power, with a convex object side and a convex image side. The ninth lens is a positive lens that focuses the light diverged by the seventh lens. The light beam changes from a divergent trend to a focusing trend, reducing the optical path and the aperture of subsequent lenses, which is conducive to miniaturization. The ninth lens can be matched with a negative CTE material, which is conducive to the realization of a real-time athermal function. The ninth lens is a biconvex shape, which can reduce the light angles on the object side and the image side, reduce the generation of spherical aberration, and is conducive to coma correction and tolerance performance. The ninth lens can be matched with reasonable materials to correct the chromatic aberration of the entire system at a position far away from the image plane, avoid chromatic aberration in the rear group of the aperture (the seventh lens to the twelfth lens), which is conducive to ensuring the consistency of the focal difference of visible light and infrared light at different object distances and the consistency of the image height difference of the two different image heights, which is conducive to the fusion of visible light and infrared light images.

[0046] In example embodiments, the tenth lens may have positive power, with an object-side surface being convex and an image-side surface being convex or concave.

[0047] In example embodiments, the eleventh lens may have negative power, with its object-side surface being convex or concave and its image-side surface being concave.

[0048] In an exemplary embodiment, the tenth lens is a positive lens, the eleventh lens is a negative lens, and the tenth lens and the eleventh lens can form a doublet lens to correct the residual chromatic aberration of the peripheral field of view. The tenth lens can be matched with a negative CTE material, which is conducive to realizing the real-time athermalization function; the eleventh lens is a negative lens, which can compensate for the insufficient target surface caused by the ninth lens and the tenth lens with positive optical power, which is conducive to realizing a large target surface and a small CRA. The tenth lens and the eleventh lens are combined into a meniscus negative lens concave to the image side, which is conducive to correcting the residual field curvature of the system and also conducive to lengthening the back focus.

[0049] In an exemplary embodiment, the twelfth lens may have positive optical power, and its object side surface is convex and its image side surface is convex. The twelfth lens is a positive lens, and with reasonable materials, it is conducive to correcting the residual chromatic aberration of the whole lens and realizing the real-time athermalization function. The image side surface of the twelfth lens is convex, which can reduce the exit angle of the focused light, make the light trend smooth, compensate for the residual spherical aberration and coma of the system, and is conducive to achieving high image quality, long back focus, and ensuring tolerance performance. The object side surface of the twelfth lens is convex, so that the light trend is smooth, which is conducive to compensating the residual field curvature of the system.

[0050] In an exemplary embodiment, the fifth lens and the sixth lens may form a double-cemented lens group, the seventh lens and the eighth lens may form a double-cemented lens group, and the tenth lens and the eleventh lens may form a double-cemented lens group. The use of a cemented lens group makes the overall structure of the optical lens compact, meeting the requirements of miniaturization, and at the same time reduces the tolerance sensitivity problems such as tilt and eccentricity of the lens unit caused during the assembly process. The double-cemented lens group can be composed of a positive lens and a negative lens respectively, and the use of opposite optical powers can make the light smoothly transition to the rear lens. In addition, the cemented lens also makes it possible to fully correct various aberrations of the optical system, improve the resolution, and optimize optical properties such as distortion and CRA under the premise of compact structure.

[0051] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤BFL / f≤2, wherein BFL is the back focus of the optical lens (i.e., the distance from the image side surface of the twelfth lens to the imaging surface of the optical lens on the optical axis), and f is the effective focal length of the optical lens. More specifically, BFL and f may further satisfy 1.35≤BFL / f≤1.7. Satisfying 1≤BFL / f≤2, on the basis of achieving miniaturization, by controlling the back focus length of the optical lens, it is beneficial to set a spectroscopic element at the rear end of the lens, realize spectroscopic acquisition of light information of different wavelengths, and realize the fusion of visible light and infrared light information.

[0052] In an exemplary embodiment, the aperture of the optical lens according to the present application may be set between the sixth lens and the seventh lens, and the optical lens may satisfy: 2≤fa / fb≤6, wherein fa is the combined effective focal length of the first lens to the sixth lens, and fb is the combined effective focal length of the seventh lens to the twelfth lens. More specifically, fa and fb may further satisfy 2.35≤fa / fb≤5.6. Satisfying 2≤fa / fb≤6 and reasonably controlling the combined focal length value of the lens groups before and after the aperture is conducive to achieving the characteristics of the lens with a large aperture, a long back focus, and high image quality, and at the same time is conducive to reducing tolerance sensitivity and improving production yield.

[0053] In an exemplary embodiment, the optical lens according to the present application may satisfy: -2≤f2 / f≤-1, wherein f2 is the effective focal length of the second lens, and f is the effective focal length of the optical lens. More specifically, f2 and f may further satisfy -1.55≤f2 / f≤-1.3. Satisfying -2≤f2 / f≤-1, the focal length value of the second lens is reasonably controlled, so that the light beam entering the lens diverges, and the light of a large field of view rises slowly, which is conducive to achieving a large aperture and a large target surface, and at the same time, it is conducive to a smooth light trend, reducing the generation of aberrations, and is conducive to achieving high image quality and ensuring tolerance performance.

[0054] In an exemplary embodiment, the optical lens according to the present application may satisfy: -1.5≤f6 / f<0, wherein f6 is the effective focal length of the sixth lens, and f is the effective focal length of the optical lens. More specifically, f6 and f may further satisfy -1.4≤f6 / f≤-0.85. Satisfying -1.5≤f6 / f<0, the focal length value of the sixth lens is reasonably controlled, aberrations are corrected, monochromatic aberrations of the first lens to the sixth lens are reduced, and the generation of aperture aberrations is avoided, which is conducive to achieving high image quality, ensuring tolerance performance and real-time athermalization function, and is conducive to achieving a large target surface and reducing CRA.

[0055] In an exemplary embodiment, the optical lens according to the present application may satisfy: -1≤f7 / f<0, wherein f7 is the effective focal length of the seventh lens, and f is the effective focal length of the optical lens. More specifically, f7 and f may further satisfy -1≤f7 / f≤-0.7. Satisfying -1≤f7 / f<0, the focal length value of the seventh lens is reasonably controlled, so that the light of the large field of view is slowly raised, so that the parallel light trend of the light beam changes to a divergent trend, which is conducive to lengthening the back focus of the lens, and is conducive to achieving a large target surface and reducing CRA.

[0056] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤f8 / f≤2, wherein f8 is the effective focal length of the eighth lens, and f is the effective focal length of the optical lens. More specifically, f8 and f may further satisfy 1.4≤f8 / f≤1.7. Satisfying 1≤f8 / f≤2 and reasonably controlling the focal length value of the eighth lens makes the light trend smooth, which is beneficial to achieving the apochromatic function while diverging the light, and is beneficial to ensuring the tolerance performance.

[0057] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.5≤f9 / f≤2.5, wherein f9 is the effective focal length of the ninth lens, and f is the effective focal length of the optical lens. More specifically, f9 and f may further satisfy 1.7≤f9 / f≤2.2. Satisfying 1.5≤f9 / f≤2.5, the focal length value of the ninth lens is reasonably controlled, the light beam changes from a divergent trend to a focusing trend, the optical path is reduced, and the aperture of the subsequent lens is reduced, which is conducive to achieving miniaturization and real-time athermalization.

[0058] In an exemplary embodiment, the optical lens according to the present application may satisfy: -2≤f11 / f≤-1, wherein f11 is the effective focal length of the eleventh lens, and f is the effective focal length of the optical lens. More specifically, f11 and f may further satisfy -1.66≤f11 / f≤-1.35. Satisfying -2≤f11 / f≤-1, rationally controlling the focal length value of the eleventh lens, compensating for and correcting the insufficient target surface caused by the ninth lens and the tenth lens, and through reverse correction, it is beneficial to achieve a large target surface and a small CRA.

[0059] In an exemplary embodiment, the optical lens according to the present application may satisfy: -3≤f78 / f≤-1, wherein f78 is the combined effective focal length of the seventh lens and the eighth lens, and f is the effective focal length of the optical lens. More specifically, f78 and f may further satisfy -2.8≤f78 / f≤-1.7. Satisfying -3≤f78 / f≤-1, rationally controlling the combined focal length value of the seventh and eighth lenses, and correcting the chromatic aberration of the entire system at a position far from the image plane to avoid chromatic aberration in the rear group of the aperture (the seventh lens to the twelfth lens) is conducive to ensuring the consistency of the rear focal difference of visible light and infrared light at different object distances and the consistency of the image height difference of the two paths with different image heights, which is conducive to the fusion of the visible light and infrared light images, and is conducive to achieving high image quality, ensuring tolerance performance, and real-time athermalization function.

[0060] In an exemplary embodiment, the aperture of the optical lens according to the present application may be disposed between the sixth lens and the seventh lens, and the optical lens may satisfy: 0.3≤T67×(fa+fb) / (fa×fb)≤0.6, wherein T67 is the air interval between the sixth lens and the seventh lens on the optical axis, fa is the combined effective focal length of the first lens to the sixth lens, and fb is the combined effective focal length of the seventh lens to the twelfth lens. More specifically, T67, fa, and fb may further satisfy 0.35≤T67×(fa+fb) / (fa×fb)≤0.6. Satisfying 0.3≤T67×(fa+fb) / (fa×fb)≤0.6, the focal length value and spacing of the lens groups before and after the aperture are reasonably controlled to ensure that the imaging function of the lens is realized when the focal length of the lens groups before and after the aperture changes, and the lens groups before and after the aperture have a higher degree of freedom, which is conducive to ensuring tolerance performance.

[0061] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.7≤IH / f≤1.2, wherein IH is the image height corresponding to the maximum field angle of the optical lens, and f is the effective focal length of the optical lens. More specifically, IH and f may further satisfy 0.8≤IH / f≤1. Satisfying 0.7≤IH / f≤1.2 is conducive to achieving a large target surface on the basis of achieving miniaturization.

[0062] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.2≤Dmax / TTL≤0.4, where Dmax is the maximum aperture of the optical lens and TTL is the total optical length of the optical lens. More specifically, Dmax and TTL may further satisfy 0.25≤Dmax / TTL≤0.35. When 0.2≤Dmax / TTL≤0.4 is satisfied, under a certain total optical length, miniaturization can be achieved by controlling the maximum aperture of the optical lens to be smaller.

[0063] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.1≤f / TTL≤0.3, wherein f is the effective focal length of the optical lens, and TTL is the total optical length of the optical lens. More specifically, f and TTL may further satisfy 0.15≤f / TTL≤0.2. Satisfying 0.1≤f / TTL≤0.3 and reasonably setting the ratio range of the effective focal length of the optical lens to the total optical length of the optical lens is conducive to the optical lens achieving a large aperture effect, while improving the resolution and tolerance sensitivity of the optical lens, ensuring the production yield of the lens, and controlling the total length of the lens so that the overall length of the lens is not too large, which is conducive to miniaturization.

[0064] In an exemplary embodiment, the optical lens according to the present application may satisfy: -4≤f1 / f≤-2, wherein f1 is the effective focal length of the first lens, and f is the effective focal length of the optical lens. More specifically, f1 and f may further satisfy -3.45≤f1 / f≤-2.3. Satisfying -4≤f1 / f≤-2 and rationally controlling the focal length of the first lens is conducive to collecting light of a large field of view, while making the light entering the lens trend smooth, reducing the generation of aberrations, and being conducive to achieving high image quality and ensuring tolerance performance, while reducing the head aperture of the lens, which is conducive to achieving miniaturization.

[0065] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.5≤f3 / f≤3, wherein f3 is the effective focal length of the third lens, and f is the effective focal length of the optical lens. More specifically, f3 and f may further satisfy 1.8≤f3 / f≤3. Satisfying 1.5≤f3 / f≤3, the focal length value of the third lens is reasonably controlled, the light is focused by the third lens, the degree of light beam divergence is reduced, and the aperture of subsequent lenses is reduced, which is conducive to achieving miniaturized volume and large aperture, and is conducive to achieving high image quality and ensuring tolerance performance.

[0066] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.5≤f4 / f≤3, wherein f4 is the effective focal length of the fourth lens, and f is the effective focal length of the optical lens. More specifically, f4 and f may further satisfy 1.85≤f4 / f≤2.8. Satisfying 1.5≤f4 / f≤3, the focal length value of the fourth lens is reasonably controlled, so that the light beam changes from a divergent trend to a focusing trend and the trend tends to be gentle, and the subsequent lens and aperture diameter are reduced, which is conducive to achieving miniaturization, reducing the generation of aperture aberrations, and is conducive to achieving high image quality and ensuring tolerance performance.

[0067] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤f5 / f≤2, wherein f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical lens. More specifically, f5 and f may further satisfy 1.1≤f5 / f≤1.8. Satisfying 1≤f5 / f≤2, rationally controlling the focal length value of the fifth lens, correcting aberrations, reducing the monochromatic aberrations of the first lens to the sixth lens before the aperture, and avoiding the generation of aperture aberrations is conducive to achieving high image quality, ensuring tolerance performance, and real-time athermalization.

[0068] In an exemplary embodiment, the optical lens according to the present application may satisfy: 2≤f10 / f≤3. Wherein, f10 is the effective focal length of the tenth lens, and f is the effective focal length of the optical lens. More specifically, f10 and f may further satisfy 2.1≤f10 / f≤2.7. Satisfying 2≤f10 / f≤3 and reasonably controlling the focal length value of the tenth lens is conducive to correcting the residual field curvature of the system, lengthening the back focus, and real-time athermalization function.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤f12 / f≤2, wherein f12 is the effective focal length of the twelfth lens, and f is the effective focal length of the optical lens. More specifically, f12 and f may further satisfy 1.45≤f12 / f≤2. Satisfying 1≤f12 / f≤2 and reasonably controlling the focal length value of the twelfth lens is conducive to correcting the residual chromatic aberration of the entire lens, achieving real-time athermalization, compensating for the residual aberration of the system, and achieving high image quality, long back focus, and ensuring tolerance performance.

[0070] In an exemplary embodiment, the optical lens according to the present application may satisfy: -22≤f56 / f≤-4, wherein f56 is the combined effective focal length of the fifth lens and the sixth lens, and f is the effective focal length of the optical lens. More specifically, f56 and f may further satisfy -21.6≤f56 / f≤-4.5. Satisfying -22≤f56 / f≤-4, rationally controlling the combined focal length value of the fifth lens and the sixth lens, correcting the chromatic aberration generated by the first lens to the fourth lens, and correcting the chromatic aberration of the entire system at a position far from the image plane is conducive to ensuring the consistency of the back focal difference of visible light and infrared light at different object distances and the consistency of the image height difference of the two paths with different image heights, which is conducive to the fusion of visible light and infrared light images, and is conducive to achieving high image quality, ensuring tolerance performance and real-time athermalization function.

[0071] In an exemplary embodiment, the optical lens according to the present application may satisfy: -7≤f1011 / f≤-4, wherein f1011 is the combined effective focal length of the tenth lens and the eleventh lens, and f is the effective focal length of the optical lens. More specifically, f1011 and f may further satisfy -6.58≤f1011 / f≤-4.3. Satisfying -7≤f1011 / f≤-4, rationally controlling the combined focal length value of the seventh lens and the eighth lens, correcting the residual chromatic aberration of the peripheral field of view and the residual field curvature of the system, is conducive to achieving a large target surface and a small CRA.

[0072] In an exemplary embodiment, the aperture number FNO of the optical lens according to the present application satisfies: FNO ≥ 1.1, more specifically, 1.2 ≤ FNO ≤ 1.6. Exemplarily, FNO = 1.21. The optical lens of the present application has a smaller aperture value, that is, it has the characteristics of a large aperture, so that the lens has a larger light throughput, thereby achieving a better night vision effect, which is conducive to the fusion of visible light and infrared light images, and obtaining an excellent full-color monitoring picture. It can maintain a high-quality full-color monitoring picture in a weak light environment of 0.0005 Lux.

[0073] In an exemplary embodiment, the effective focal length F of the optical lens according to the present application may be in the range of 15 mm to 25 mm, for example, F may be 18.2 mm, 20 mm, 22 mm, etc.

[0074] In an exemplary embodiment, the absolute value of optical distortion of the optical lens according to the present application is in the range of 8.78% to 9.89%.

[0075] In an exemplary embodiment, the image height IH corresponding to the maximum field angle of the optical lens according to the present application is greater than 17.5 mm, and has the characteristic of a large target surface.

[0076] In an exemplary embodiment, the optical lens according to the present application has a wide object distance range, which ranges from 1.5 m to infinity.

[0077] 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 twelfth lens and the imaging plane. The filter can filter light with different wavelengths, and the protective glass can prevent damage to the image-side element (e.g., chip) of the optical lens.

[0078] In an exemplary embodiment, each lens of the optical lens of the present application may be a spherical lens or an aspherical lens. As needed, the present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased, or 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. Exemplarily, the first lens to the twelfth lens in the present application are all spherical lenses.

[0079] Those skilled in the art should understand that the temperature coefficient of refractive index dn / dt and anomalous dispersion of plastics are relatively large. Reasonable matching of appropriate amounts of plastic materials is beneficial to high and low temperature balance and infrared confocality, but too many plastic lenses are not conducive to system stability. Optical lenses made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve system stability; at the same time, the use of glass materials can avoid the problem of lens imaging blur caused by high and low temperature changes in the use environment, which affects the normal use of the lens. The use of glass materials is conducive to the athermalization of the lens. For example, when the first lens to the twelfth lens are all made of glass lens materials, the temperature range of the optical lens with a full glass design is wider, and stable optical performance can be maintained in the range of -30℃ to 75℃. In addition, the use of glass materials can also better correct system chromatic aberration, improve the resolution of the lens, and reduce the generation of ghost images.

[0080] The present application does not specifically limit the material of the lens. When focusing on the resolution quality and reliability, the first lens to the twelfth lens can all be made of glass. Of course, in applications where the temperature stability requirements are low, the first lens to the twelfth lens in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce production costs. Of course, the first lens to the twelfth lens in the optical lens can also be made of a combination of plastic and glass.

[0081] The optical lens according to the above-mentioned embodiment of the present application may adopt multiple lenses, for example, the twelve lenses mentioned above, and by reasonably allocating the optical parameters such as the optical focal length and surface shape of each lens, it is possible to achieve at least one beneficial effect such as miniaturization, high resolution (4K), large aperture (FNO≥1.1), large target surface (IH>17.5mm), real-time athermalization, low ghosting, and a wide object distance range (1.5m to infinity).

[0082] However, it should be understood by those skilled in the art that the number of lenses constituting the lens can be changed without departing from the technical solution claimed in the present application to obtain the various results and advantages described in this specification. For example, although twelve lenses are described as an example in the embodiments, the optical lens is not limited to twelve lenses. If necessary, the optical lens may also include other numbers of lenses. The following further describes specific embodiments of the optical lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0083] Example 1

[0084] 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.

[0085] 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, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12.

[0086] The first lens L1 has negative refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is concave.

[0087] The second lens L2 has negative refractive power, and its object-side surface S3 is concave, and its image-side surface S4 is concave.

[0088] The third lens L3 has positive refractive power, an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex.

[0089] The fourth lens L4 has positive refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is convex.

[0090] The fifth lens L5 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0091] The sixth lens L6 has negative refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is concave.

[0092] The seventh lens L7 has negative refractive power, and its object-side surface S13 is concave, and its image-side surface S14 is concave.

[0093] The eighth lens L8 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0094] The ninth lens L9 has positive refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex.

[0095] The tenth lens L10 has positive refractive power, and its object-side surface S18 is convex, and its image-side surface S19 is convex.

[0096] The eleventh lens L11 has negative refractive power, and its object-side surface S19 is concave and its image-side surface S20 is concave.

[0097] The twelfth lens L12 has positive refractive power, and its object-side surface S21 is convex, and its image-side surface S22 is convex.

[0098] The fifth lens L5 and the sixth lens L6 form a doublet lens group, the seventh lens L7 and the eighth lens L8 form a doublet lens group, and the tenth lens L10 and the eleventh lens L11 form a doublet lens group.

[0099] The optical lens may further include a stop STO, and the stop STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0100] like Figure 1 As shown, the optical lens may also include a prism PG, a filter IR and a protective glass CG. The prism PG separates visible light and infrared light through coating, and obtains imaging information respectively by using the color information of visible light and the brightness information characteristics of infrared light. Then, the two light information are integrated through technical means to achieve high-quality color imaging images around the clock. The filter IR can be used to correct color deviation, and the protective glass CG can be used to protect the image sensor chip located at the imaging surface IMA. The light from the object passes through the first lens L1 to the twelfth lens L12, the prism PG, the filter IR and the protective glass CG 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 all millimeters (mm). Table 1 calculates the thickness / distance of the prism PG, the filter IR and the protective glass CG as a whole, and therefore only shows the object side surface S23 of the prism PG and the image side surface S24 of the protective glass CG.

[0102] Table 1

[0103] The effective focal length f of the optical lens of Example 1 is 20 mm, and the aperture number FNO is 1.21.

[0104] Figure 2 The distortion curve of the optical lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. The absolute value of the optical distortion of the edge field of view of the lens is 8.78%. Figure 3 The Ray Fan diagram of the optical lens of Example 1 is shown, which indicates the aberrations corresponding to different fields of view. Figure 2 and Figure 3 It can be seen that the optical lens provided in Example 1 has the characteristics of low distortion and low aberration, and can achieve good imaging quality.

[0105] Example 2

[0106] The following reference Figure 4 An optical lens according to Embodiment 2 of the present application is described. Figure 4 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown.

[0107] 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, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12.

[0108] The first lens L1 has negative refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is concave.

[0109] The second lens L2 has negative refractive power, and its object-side surface S3 is concave, and its image-side surface S4 is concave.

[0110] The third lens L3 has positive refractive power, an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex.

[0111] The fourth lens L4 has positive refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is convex.

[0112] The fifth lens L5 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0113] The sixth lens L6 has negative refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is concave.

[0114] The seventh lens L7 has negative refractive power, and its object-side surface S13 is concave, and its image-side surface S14 is concave.

[0115] The eighth lens L8 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0116] The ninth lens L9 has positive refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex.

[0117] The tenth lens L10 has positive refractive power, and its object-side surface S18 is convex, and its image-side surface S19 is convex.

[0118] The eleventh lens L11 has negative refractive power, and its object-side surface S19 is concave and its image-side surface S20 is concave.

[0119] The twelfth lens L12 has positive refractive power, and its object-side surface S21 is convex, and its image-side surface S22 is convex.

[0120] The fifth lens L5 and the sixth lens L6 form a doublet lens group, the seventh lens L7 and the eighth lens L8 form a doublet lens group, and the tenth lens L10 and the eleventh lens L11 form a doublet lens group.

[0121] The optical lens may further include a stop STO, and the stop STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0122] like Figure 4 As shown, the optical lens may also include a prism PG, a filter IR and a protective glass CG. The prism PG separates visible light and infrared light through coating, and obtains imaging information respectively by using the color information of visible light and the brightness information characteristics of infrared light. Then, the two light information are integrated through technical means to achieve high-quality color imaging images around the clock. The filter IR can be used to correct color deviation, and the protective glass CG can be used to protect the image sensor chip located at the imaging surface IMA. The light from the object passes through the first lens L1 to the twelfth lens L12, the prism PG, the filter IR and the protective glass CG in sequence and is finally imaged on the imaging surface IMA.

[0123] Table 2 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 all millimeters (mm). Table 2 calculates the thickness / distance of the prism PG, the filter IR and the protective glass CG as a whole, and therefore only shows the object side surface S23 of the prism PG and the image side surface S24 of the protective glass CG.

[0124] Table 2

[0125] The effective focal length f of the optical lens of Example 2 is 18.2 mm, and the aperture number FNO is 1.21.

[0126] Figure 5 The distortion curve of the optical lens of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. The absolute value of the optical distortion of the edge field of view of the lens is 9.89%. Figure 6 The Ray Fan diagram of the optical lens of Example 2 is shown, which indicates the aberrations corresponding to different fields of view. Figure 5 and Figure 6 It can be seen that the optical lens provided in Example 2 has the characteristics of low distortion and low aberration, and can achieve good imaging quality.

[0127] Example 3

[0128] The following reference Figure 7 An optical lens according to Example 3 of the present application is described. Figure 7 A schematic structural diagram of an optical lens according to Example 3 of the present application is shown.

[0129] like Figure 7 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, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12.

[0130] The first lens L1 has negative refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is concave.

[0131] The second lens L2 has negative refractive power, and its object-side surface S3 is concave, and its image-side surface S4 is concave.

[0132] The third lens L3 has positive refractive power, and its object-side surface S5 is convex, and its image-side surface S6 is convex.

[0133] The fourth lens L4 has positive refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is concave.

[0134] The fifth lens L5 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0135] The sixth lens L6 has negative refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is concave.

[0136] The seventh lens L7 has negative refractive power, and its object-side surface S13 is concave, and its image-side surface S14 is concave.

[0137] The eighth lens L8 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0138] The ninth lens L9 has positive refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex.

[0139] The tenth lens L10 has positive refractive power, and its object-side surface S18 is convex, and its image-side surface S19 is convex.

[0140] The eleventh lens L11 has negative refractive power, and its object-side surface S19 is concave and its image-side surface S20 is concave.

[0141] The twelfth lens L12 has positive refractive power, and its object-side surface S21 is convex, and its image-side surface S22 is convex.

[0142] The fifth lens L5 and the sixth lens L6 form a doublet lens group, the seventh lens L7 and the eighth lens L8 form a doublet lens group, and the tenth lens L10 and the eleventh lens L11 form a doublet lens group.

[0143] The optical lens may further include a stop STO, and the stop STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0144] like Figure 7 As shown, the optical lens may also include a prism PG, a filter IR and a protective glass CG. The prism PG separates visible light and infrared light through coating, and obtains imaging information respectively by using the color information of visible light and the brightness information characteristics of infrared light. Then, the two light information are integrated through technical means to achieve high-quality color imaging images around the clock. The filter IR can be used to correct color deviation, and the protective glass CG can be used to protect the image sensor chip located at the imaging surface IMA. The light from the object passes through the first lens L1 to the twelfth lens L12, the prism PG, the filter IR and the protective glass CG in sequence and is finally imaged on the imaging surface IMA.

[0145] Table 3 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 all millimeters (mm). Table 3 calculates the thickness / distance of the prism PG, the filter IR and the protective glass CG as a whole, and therefore only shows the object side surface S23 of the prism PG and the image side surface S24 of the protective glass CG.

[0146] Table 3

[0147] The effective focal length f of the optical lens of Example 3 is 22 mm, and the aperture number FNO is 1.21.

[0148] Figure 8 The distortion curve of the optical lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. The absolute value of the optical distortion of the edge field of view of the lens is 8.90%. Fig. 9 The Ray Fan diagram of the optical lens of Example 3 is shown, which indicates the aberrations corresponding to different fields of view. Figure 8 and Fig. 9 It can be seen that the optical lens provided in Example 3 has the characteristics of low distortion and low aberration, and can achieve good imaging quality.

[0149] Example 4

[0150] The following reference Fig.10 An optical lens according to Example 4 of the present application is described. Fig.10 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0151] like Fig.10 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, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12.

[0152] The first lens L1 has negative refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is concave.

[0153] The second lens L2 has negative refractive power, and its object-side surface S3 is concave, and its image-side surface S4 is concave.

[0154] The third lens L3 has positive refractive power, and its object-side surface S5 is convex, and its image-side surface S6 is convex.

[0155] The fourth lens L4 has positive refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is concave.

[0156] The fifth lens L5 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0157] The sixth lens L6 has negative refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is concave.

[0158] The seventh lens L7 has negative refractive power, and its object-side surface S13 is concave, and its image-side surface S14 is concave.

[0159] The eighth lens L8 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0160] The ninth lens L9 has positive refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex.

[0161] The tenth lens L10 has positive refractive power, and its object-side surface S18 is convex, and its image-side surface S19 is concave.

[0162] The eleventh lens L11 has negative refractive power, and its object-side surface S19 is convex, and its image-side surface S20 is concave.

[0163] The twelfth lens L12 has positive refractive power, and its object-side surface S21 is convex, and its image-side surface S22 is convex.

[0164] The fifth lens L5 and the sixth lens L6 form a doublet lens group, the seventh lens L7 and the eighth lens L8 form a doublet lens group, and the tenth lens L10 and the eleventh lens L11 form a doublet lens group.

[0165] The optical lens may further include a stop STO, and the stop STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0166] like Fig.10 As shown, the optical lens may also include a prism PG, a filter IR and a protective glass CG. The prism PG separates visible light and infrared light through coating, and obtains imaging information respectively by using the color information of visible light and the brightness information characteristics of infrared light. Then, the two light information are integrated through technical means to achieve high-quality color imaging images around the clock. The filter IR can be used to correct color deviation, and the protective glass CG can be used to protect the image sensor chip located at the imaging surface IMA. The light from the object passes through the first lens L1 to the twelfth lens L12, the prism PG, the filter IR and the protective glass CG in sequence and is finally imaged on the imaging surface IMA.

[0167] Table 4 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 all millimeters (mm). Table 4 calculates the thickness / distance of the prism PG, the filter IR and the protective glass CG as a whole, and therefore only shows the object side surface S23 of the prism PG and the image side surface S24 of the protective glass CG.

[0168] Table 4

[0169] The effective focal length f of the optical lens of Example 4 is 20 mm, and the aperture number FNO is 1.21.

[0170] Fig.11 The distortion curve of the optical lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. The absolute value of the optical distortion of the edge field of view of the lens is 8.98%. Fig.12 The RayFan diagram of the optical lens of Example 4 is shown, which indicates the aberrations corresponding to different fields of view. Fig.11 and Fig.12 It can be seen that the optical lens provided in Example 4 has the characteristics of low distortion and low aberration, and can achieve good imaging quality.

[0171] Example 5

[0172] The following reference Fig.13 An optical lens according to Example 5 of the present application is described. Fig.13 A schematic structural diagram of an optical lens according to Example 5 of the present application is shown.

[0173] like Fig.13 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, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12.

[0174] The first lens L1 has negative refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is concave.

[0175] The second lens L2 has negative refractive power, and its object-side surface S3 is concave, and its image-side surface S4 is concave.

[0176] The third lens L3 has positive refractive power, and its object-side surface S5 is convex, and its image-side surface S6 is convex.

[0177] The fourth lens L4 has positive refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is convex.

[0178] The fifth lens L5 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0179] The sixth lens L6 has negative refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is concave.

[0180] The seventh lens L7 has negative refractive power, and its object-side surface S13 is concave, and its image-side surface S14 is concave.

[0181] The eighth lens L8 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0182] The ninth lens L9 has positive refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex.

[0183] The tenth lens L10 has positive refractive power, and its object-side surface S18 is convex, and its image-side surface S19 is convex.

[0184] The eleventh lens L11 has negative refractive power, and its object-side surface S19 is concave and its image-side surface S20 is concave.

[0185] The twelfth lens L12 has positive refractive power, and its object-side surface S21 is convex, and its image-side surface S22 is convex.

[0186] The fifth lens L5 and the sixth lens L6 form a doublet lens group, the seventh lens L7 and the eighth lens L8 form a doublet lens group, and the tenth lens L10 and the eleventh lens L11 form a doublet lens group.

[0187] The optical lens may further include a stop STO, and the stop STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0188] like Fig.13 As shown, the optical lens may also include a prism PG, a filter IR and a protective glass CG. The prism PG separates visible light and infrared light through coating, and obtains imaging information respectively by using the color information of visible light and the brightness information characteristics of infrared light. Then, the two light information are integrated through technical means to achieve high-quality color imaging images around the clock. The filter IR can be used to correct color deviation, and the protective glass CG can be used to protect the image sensor chip located at the imaging surface IMA. The light from the object passes through the first lens L1 to the twelfth lens L12, the prism PG, the filter IR and the protective glass CG in sequence and is finally imaged on the imaging surface IMA.

[0189] Table 5 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the optical lens of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). Table 5 calculates the thickness / distance of the prism PG, the filter IR and the protective glass CG as a whole, and therefore only shows the object side surface S23 of the prism PG and the image side surface S24 of the protective glass CG.

[0190] Table 5

[0191] The effective focal length f of the optical lens of Example 5 is 20 mm, and the aperture number FNO is 1.21.

[0192] Fig.14 The distortion curve of the optical lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. The absolute value of the optical distortion of the edge field of view of the lens is 8.98%. Fig.15 The RayFan diagram of the optical lens of Example 5 is shown, which indicates the aberrations corresponding to different fields of view. Fig.14 and Fig.15 It can be seen that the optical lens provided in Example 5 has the characteristics of low distortion and low aberration, and can achieve good imaging quality.

[0193] Example 6

[0194] The following reference Fig.16 An optical lens according to Example 6 of the present application is described. Fig.16 A schematic structural diagram of an optical lens according to Example 6 of the present application is shown.

[0195] like Fig.16 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, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12.

[0196] The first lens L1 has negative refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is concave.

[0197] The second lens L2 has negative refractive power, and its object-side surface S3 is concave, and its image-side surface S4 is concave.

[0198] The third lens L3 has positive refractive power, an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex.

[0199] The fourth lens L4 has positive refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is convex.

[0200] The fifth lens L5 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0201] The sixth lens L6 has negative refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is concave.

[0202] The seventh lens L7 has negative refractive power, and its object-side surface S13 is concave, and its image-side surface S14 is concave.

[0203] The eighth lens L8 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0204] The ninth lens L9 has positive refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex.

[0205] The tenth lens L10 has positive refractive power, and its object-side surface S18 is convex, and its image-side surface S19 is convex.

[0206] The eleventh lens L11 has negative refractive power, and its object-side surface S19 is concave and its image-side surface S20 is concave.

[0207] The twelfth lens L12 has positive refractive power, and its object-side surface S21 is convex, and its image-side surface S22 is convex.

[0208] The fifth lens L5 and the sixth lens L6 form a doublet lens group, the seventh lens L7 and the eighth lens L8 form a doublet lens group, and the tenth lens L10 and the eleventh lens L11 form a doublet lens group.

[0209] The optical lens may further include a stop STO, and the stop STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0210] like Fig.16 As shown, the optical lens may also include a prism PG, a filter IR and a protective glass CG. The prism PG separates visible light and infrared light through coating, and obtains imaging information respectively by using the color information of visible light and the brightness information characteristics of infrared light. Then, the two light information are integrated through technical means to achieve high-quality color imaging images around the clock. The filter IR can be used to correct color deviation, and the protective glass CG can be used to protect the image sensor chip located at the imaging surface IMA. The light from the object passes through the first lens L1 to the twelfth lens L12, the prism PG, the filter IR and the protective glass CG in sequence and is finally imaged on the imaging surface IMA.

[0211] Table 6 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the optical lens of Example 6, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). Table 6 calculates the thickness / distance of the prism PG, the filter IR and the protective glass CG as a whole, and therefore only shows the object side surface S23 of the prism PG and the image side surface S24 of the protective glass CG.

[0212] Table 6

[0213] The effective focal length f of the optical lens of Example 6 is 20 mm, and the aperture number FNO is 1.21.

[0214] Fig.17 The distortion curve of the optical lens of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. The absolute value of the optical distortion of the edge field of view of the lens is 8.94%. Fig.18 The RayFan diagram of the optical lens of Example 6 is shown, which indicates the aberrations corresponding to different fields of view. Fig.17 and Fig.18 It can be seen that the optical lens provided in Example 6 has the characteristics of low distortion and low aberration, and can achieve good imaging quality.

[0215] Example 7

[0216] The following reference Fig.19 An optical lens according to Example 7 of the present application is described. Fig.19 A schematic structural diagram of an optical lens according to Example 7 of the present application is shown.

[0217] like Fig.19 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, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12.

[0218] The first lens L1 has negative refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is concave.

[0219] The second lens L2 has negative refractive power, and its object-side surface S3 is concave, and its image-side surface S4 is concave.

[0220] The third lens L3 has positive refractive power, an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex.

[0221] The fourth lens L4 has positive refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is concave.

[0222] The fifth lens L5 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0223] The sixth lens L6 has negative refractive power, and its object-side surface S10 is concave, and its image-side surface S11 is concave.

[0224] The seventh lens L7 has negative refractive power, and its object-side surface S13 is concave, and its image-side surface S14 is concave.

[0225] The eighth lens L8 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0226] The ninth lens L9 has positive refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex.

[0227] The tenth lens L10 has positive refractive power, and its object-side surface S18 is convex, and its image-side surface S19 is convex.

[0228] The eleventh lens L11 has negative refractive power, and its object-side surface S19 is concave and its image-side surface S20 is concave.

[0229] The twelfth lens L12 has positive refractive power, and its object-side surface S21 is convex, and its image-side surface S22 is convex.

[0230] The fifth lens L5 and the sixth lens L6 form a doublet lens group, the seventh lens L7 and the eighth lens L8 form a doublet lens group, and the tenth lens L10 and the eleventh lens L11 form a doublet lens group.

[0231] The optical lens may further include a stop STO, and the stop STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0232] like Fig.19 As shown, the optical lens may also include a prism PG, a filter IR and a protective glass CG. The prism PG separates visible light and infrared light through coating, and obtains imaging information respectively by using the color information of visible light and the brightness information characteristics of infrared light. Then, the two light information are integrated through technical means to achieve high-quality color imaging images around the clock. The filter IR can be used to correct color deviation, and the protective glass CG can be used to protect the image sensor chip located at the imaging surface IMA. The light from the object passes through the first lens L1 to the twelfth lens L12, the prism PG, the filter IR and the protective glass CG in sequence and is finally imaged on the imaging surface IMA.

[0233] Table 7 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the optical lens of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). Table 7 calculates the thickness / distance of the prism PG, the filter IR and the protective glass CG as a whole, and therefore only shows the object side surface S23 of the prism PG and the image side surface S24 of the protective glass CG.

[0234] Table 7

[0235] The effective focal length f of the optical lens of Example 7 is 20 mm, and the aperture number FNO is 1.21.

[0236] Fig. 20 The distortion curve of the optical lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. The absolute value of the optical distortion of the edge field of view of the lens is 8.94%. Fig.21 The RayFan diagram of the optical lens of Example 7 is shown, which indicates the aberrations corresponding to different fields of view. Fig. 20 and Fig.21 It can be seen that the optical lens provided in Example 7 has the characteristics of low distortion and low aberration, and can achieve good imaging quality.

[0237] In summary, Examples 1 to 7 respectively satisfy the relationship shown in Table 8 below.

[0238] Table 8

[0239] The present application also provides an electronic device, which may include an optical lens according to the above-mentioned embodiment of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0240] 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 negative 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 positive refractive power; a sixth lens having negative optical power; a seventh lens having negative optical power; an eighth lens having positive refractive power; a ninth lens having positive refractive power; a tenth lens having positive optical power; an eleventh lens having negative optical power; and a twelfth lens having positive refractive power; The number of lenses having optical power in the optical lens is twelve.

2. The optical lens according to claim 1, wherein: The object side surface of the first lens is convex, and the image side surface is concave; The object side surface of the second lens is concave, and the image side surface is concave; The image side surface of the third lens is a convex surface; The object side surface of the fourth lens is a convex surface; The object side surface and the image side surface of the fifth lens are both convex surfaces; The object side surface and the image side surface of the sixth lens are both concave surfaces; The object side surface and the image side surface of the seventh lens are both concave surfaces; The object side surface and the image side surface of the eighth lens are both convex surfaces; The object side surface and the image side surface of the ninth lens are both convex surfaces; The object side surface of the tenth lens is a convex surface; The image side surface of the eleventh lens is a concave surface; The object side surface and the image side surface of the twelfth lens are both convex surfaces.

3. The optical lens according to claim 1, wherein: The optical lens satisfies: 1≤BFL / f≤2, wherein BFL is the back focus of the optical lens, and f is the effective focal length of the optical lens.

4. The optical lens according to claim 1, wherein: The optical lens satisfies: 2≤fa / fb≤6, wherein fa is the combined effective focal length of the first lens to the sixth lens, and fb is the combined effective focal length of the seventh lens to the twelfth lens.

5. The optical lens according to claim 1, wherein: The optical lens satisfies: -2≤f2 / f≤-1, wherein f2 is the effective focal length of the second lens, and f is the effective focal length of the optical lens.

6. The optical lens according to claim 1, wherein: The optical lens satisfies: -1.5≤f6 / f<0, wherein f6 is the effective focal length of the sixth lens, and f is the effective focal length of the optical lens.

7. The optical lens according to claim 1, wherein: The optical lens satisfies: -1≤f7 / f<0, wherein f7 is the effective focal length of the seventh lens, and f is the effective focal length of the optical lens.

8. The optical lens according to claim 1, wherein: The optical lens satisfies: 1≤f8 / f≤2, wherein f8 is the effective focal length of the eighth lens, and f is the effective focal length of the optical lens.

9. The optical lens according to claim 1, wherein: The optical lens satisfies: 1.5≤f9 / f≤2.5, wherein f9 is the effective focal length of the ninth lens, and f is the effective focal length of the optical lens.

10. The optical lens according to claim 1, wherein: The optical lens satisfies: -2≤f11 / f≤-1, wherein f11 is the effective focal length of the eleventh lens, and f is the effective focal length of the optical lens.

11. The optical lens according to claim 1, wherein: The optical lens satisfies: -3≤f78 / f≤-1, wherein f78 is the combined effective focal length of the seventh lens and the eighth lens, and f is the effective focal length of the optical lens.

12. The optical lens according to claim 1, wherein: The optical lens satisfies: 0.3≤T67×(fa+fb) / (fa×fb)≤0.6, wherein T67 is an air interval between the sixth lens and the seventh lens on the optical axis, fa is a combined effective focal length of the first lens to the sixth lens, and fb is a combined effective focal length of the seventh lens to the twelfth lens.

13. The optical lens according to any one of claims 1 to 12, wherein: The optical lens satisfies at least one of the following conditions: 0.7≤IH / f≤1.2,0.2≤Dmax / TTL≤0.4,0.1≤f / TTL≤0.3,-4≤f1 / f≤-2,1.5≤f3 / f≤3,1.5≤f4 / f≤3,1≤f5 / f≤2,2≤f10 / f≤3,1≤f12 / f≤2,-22≤f56 / f≤-4,-7≤f1011 / f≤-4, Among them, IH is the image height corresponding to the maximum field angle of the optical lens, f is the effective focal length of the optical lens, Dmax is the maximum clear aperture of the optical lens, TTL is the total optical length of the optical lens, f1 is the effective focal length of the first 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, f10 is the effective focal length of the tenth lens, f12 is the effective focal length of the twelfth lens, f56 is the combined effective focal length of the fifth lens and the sixth lens, and f1011 is the combined effective focal length of the tenth lens and the eleventh lens.

14. The optical lens according to any one of claims 1 to 12, wherein: The optical lens satisfies at least one of the following conditions: 1.35≤BFL / f≤1.7, 0.8≤IH / f≤1, 0.25≤Dmax / TTL≤0.35, 2.35≤fa / fb≤5.6, 0.15≤f / TTL≤0.2, -3.45≤f1 / f≤-2.3, -1.55≤f2 / f≤-1.3, 1.8≤f3 / f≤3, 1.85≤f4 / f≤2.8, 1.1≤f5 / f≤1.8, -1.4≤f6 / f≤-0.85, -1≤f7 / f≤-0.7, 1.4≤f8 / f≤1.7, 1.7≤f9 / f≤2.2, 2.1≤f10 / f≤2.7, -1.66≤f11 / f≤-1.35, 1.45≤f12 / f≤2, -21.6≤f56 / f≤-4.5, -2.8≤f78 / f≤-1.7, -6.58≤f1011 / f≤-4.3, 0.35≤T67×(fa+fb) / (fa×fb)≤0.6, in, BFL is the back focus of the optical lens, IH is the image height corresponding to the maximum field of view angle of the optical lens, f is the effective focal length of the optical lens, fa is the combined effective focal length of the first lens to the sixth lens, fb is the combined effective focal length of the seventh lens to the twelfth lens, Dmax is the maximum clear aperture of the optical lens, TTL is the total optical length of the optical lens, f1 is the effective focal length of the first lens, 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, and f6 is the effective focal length of the wherein f7 is the effective focal length of the sixth lens, f8 is the effective focal length of the eighth lens, f9 is the effective focal length of the ninth lens, f10 is the effective focal length of the tenth lens, f11 is the effective focal length of the eleventh lens, f12 is the effective focal length of the twelfth lens, f56 is the combined effective focal length of the fifth lens and the sixth lens, f78 is the combined effective focal length of the seventh lens and the eighth lens, f1011 is the combined effective focal length of the tenth lens and the eleventh lens, and T67 is the air distance between the sixth lens and the seventh lens on the optical axis.

Images