Optical lens

Abstract

The application provides an optical lens, which has eight lenses with optical power, and sequentially comprises, along an optical axis from an object side to an imaging surface, a first lens with negative optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a second lens with negative optical power, whose object side surface is a concave surface and whose image side surface is a convex surface; a third lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a fourth lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a convex surface; a fifth lens with negative optical power, whose object side surface is a concave surface and whose image side surface is a concave surface; a sixth lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a convex surface near the optical axis; a seventh lens with negative optical power, whose object side surface is a convex surface near the optical axis and whose image side surface is a concave surface near the optical axis; and an eighth lens with positive optical power. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration and improve the imaging quality of the optical lens.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens. BACKGROUND ART

[0002] In the field of modern motion image capture, high-performance portable optical systems are a core requirement. Currently, most action camera lenses on the market adopt large-aperture, ultra-wide-angle designs to adapt to high-speed motion scenes and extreme environment shooting. However, these conventional optical structures generally have the problems of degraded imaging quality and insufficient dynamic range in low-light environments. Meanwhile, the increase of the field of view of the lens makes it difficult to correct system aberrations, leading to the degradation of imaging quality; and existing lenses have small imaging target surfaces, which can hardly meet market demands. SUMMARY OF THE INVENTION

[0003] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.

[0004] To achieve the above object, the technical solution adopted by the present invention is: An optical lens, wherein the number of lenses with optical power is eight, and the lens sequentially comprises the following components along an optical axis from an object side to an imaging surface: a first lens with negative optical power, an object-side surface of which is a convex surface, and an image-side surface of which is a concave surface; a second lens with negative optical power, an object-side surface of which is a concave surface, and an image-side surface of which is a convex surface; a third lens with positive optical power, an object-side surface of which is a convex surface, and an image-side surface of which is a concave surface; a fourth lens with positive optical power, an object-side surface of which is a convex surface, and an image-side surface of which is a convex surface; a fifth lens with negative optical power, an object-side surface of which is a concave surface, and an image-side surface of which is a concave surface; a sixth lens with positive optical power, an object-side surface of which is a convex surface, and an image-side surface of which is a convex surface near the optical axis; a seventh lens with negative optical power, an object-side surface of which is a convex surface near the optical axis, and an image-side surface of which is a concave surface near the optical axis; an eighth lens with positive optical power, an object-side surface of which is a convex surface, and an image-side surface of which is a convex surface; wherein, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.3<IH / f<3.6; the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: 1.7<f1 / f5<3.

[0005] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.3<TTL / f<6.4; the total optical length TTL of the optical lens and the actual image height IH corresponding to the maximum field of view of the optical lens satisfy: 1.5<TTL / IH<2.1.

[0006] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 50°<FOV / Fno<65°; the actual image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 6.5<IH / EPD<9.5.

[0007] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the effective focal length f of the optical lens, the actual image height IH corresponding to the maximum field of view of the optical lens and the maximum field of view FOV of the optical lens satisfy: 44°<f×FOV / IH<67°; the clear aperture half-diameter d1 of the object side surface of the first lens, the actual image height IH corresponding to the maximum field of view of the optical lens and the maximum field of view FOV of the optical lens satisfy: 0.07<d1 / (IH / 2) / tan(FOV / 2)<0.19; the actual image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens and the radian value θ of the maximum half field of view of the optical lens satisfy: 0.9<(IH / 2) / (f×θ)<1.2.

[0008] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.9<f1 / f<-1.2; the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 1.5<R1 / f<2.5; the curvature radius R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.4<R2 / f<0.8.

[0009] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -28<f2 / f<-2.8; the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: -1.7<R3 / f<-0.9; the curvature radius R4 of the image side surface of the second lens and the effective focal length f of the optical lens satisfy: -3.7<R4 / f<-1.2.

[0010] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.2<f3 / f<2.1; the radius of curvature R5 of the object-side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.9<R5 / f<1.5; the radius of curvature R6 of the image-side surface of the third lens and the effective focal length f of the optical lens satisfy: 2.2<R6 / f<7.9.

[0011] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.5<f4 / f<1.2; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 1.7<f6 / f<7.6; the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -13.5<f7 / f<-2; the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: 1.2<f8 / f<1.9; the combined focal length f123 of the first lens, the second lens and the third lens and the effective focal length f of the optical lens satisfy: 1.8<f123 / f<5.2; the combined focal length f45678 of the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens and the effective focal length f of the optical lens satisfy: 1.6<f45678 / f<2.5; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0<f1 / f2<0.5; the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -15<f2 / f3<-2.1; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 1.6<f3 / f4<2.8; the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -1.4<f4 / f5<-1; the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.4<f5 / f6<-0.1; the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -1.3<f6 / f7<-0.4; the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy: -8.8<f7 / f8<-1.3.

[0012] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1<f5 / f<-0.5; the radius of curvature R9 of the object-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -0.7<R9 / f<-0.4; the radius of curvature R10 of the image-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1<R10 / f<5.

[0013] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.59<IH / f<3.29; the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: 1.88<f1 / f5<2.76.

[0014] The optical lens provided by the present invention adopts eight lenses with specific optical power, and through specific matching of surface shapes and reasonable power distribution, can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as miniaturization, large field of view, large image plane, high pixel, and high imaging quality. Description of Drawings

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easier to understand from the following description of embodiments in conjunction with the accompanying drawings, in which: Figure 1 is a schematic structural diagram of the optical lens in embodiment 1 of the present invention.

[0016] Figure 2 is an MTF curve diagram of the optical lens in embodiment 1 of the present invention.

[0017] Figure 3 is a schematic structural diagram of the optical lens in embodiment 2 of the present invention.

[0018] Figure 4 is an MTF curve diagram of the optical lens in embodiment 2 of the present invention.

[0019] Figure 5 is a schematic structural diagram of the optical lens in embodiment 3 of the present invention.

[0020] Figure 6 is an MTF curve diagram of the optical lens in embodiment 3 of the present invention.

[0021] Figure 7 is a schematic structural diagram of the optical lens in embodiment 4 of the present invention.

[0022] Figure 8 is an MTF curve diagram of the optical lens in embodiment 4 of the present invention.

[0023] Figure 9 is a schematic structural diagram of the optical lens in embodiment 5 of the present invention.

[0024] Figure 10 is an MTF curve diagram of the optical lens in embodiment 5 of the present invention.

[0025] Figure 11This is a schematic diagram of the optical lens structure in Embodiment 6 of the present invention.

[0026] Figure 12 This is an MTF curve of the optical lens in Embodiment 6 of the present invention.

[0027] Figure 13 This is a schematic diagram of the optical lens in Embodiment 7 of the present invention.

[0028] Figure 14 This is the MTF curve of the optical lens in Embodiment 7 of the present invention.

[0029] Figure 15 This is a schematic diagram of the optical lens in Embodiment 8 of the present invention.

[0030] Figure 16 This is the MTF curve of the optical lens in Embodiment 8 of the present invention.

[0031] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0032] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0034] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0035] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0036] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0037] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] The optical lens of this embodiment of the invention has eight lenses with optical power, arranged sequentially along the optical axis from the object side to the imaging plane as follows: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens.

[0040] In some embodiments, a first lens with negative optical power has a convex object-side surface and a concave image-side surface. A second lens may have negative optical power, with a concave object-side surface and a convex image-side surface. A third lens may have positive optical power, with a convex object-side surface and a concave image-side surface. A fourth lens may have positive optical power, with both its object-side and image-side surfaces being convex. A fifth lens may have negative optical power, with both its object-side and image-side surfaces being concave. A sixth lens may have positive optical power, with a convex object-side surface and a convex image-side surface near the optical axis. A seventh lens may have negative optical power, with a convex object-side surface near the optical axis and a concave image-side surface near the optical axis. An eighth lens may have positive optical power, with both its object-side and image-side surfaces being convex.

[0041] In some embodiments, the optical lens may also include an aperture stop, which may be located between the third and fourth lenses. It is understood that the aperture stop is used to limit the amount of light entering the lens, thereby altering the brightness of the image.

[0042] In some embodiments, the optical lens may further comprise a filter, which is disposed between the eighth lens and the imaging surface. The filter is configured to filter out interfering light, preventing interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0043] In some embodiments, the fourth lens and the fifth lens may be cemented to form a cemented lens group with optical power, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the difficulty of the processing process of the optical lens and improving the assembly yield of the optical lens.

[0044] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.3 < IH / f < 3.6. Satisfying the above range, by reasonably controlling the ratio of the image height to the focal length of the lens, the characteristics of ultra-wide angle and large image surface are realized. More specifically, 2.59 < IH / f < 3.29.

[0045] In some embodiments, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: 1.7 < f1 / f5 < 3. Satisfying the above range can avoid excessive light refraction and reduce the difficulty of aberration correction. More specifically, 1.88 < f1 / f5 < 2.76.

[0046] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.3 < TTL / f < 6.4. Satisfying the above range can effectively limit the length of the lens, which is beneficial to realizing the miniaturization of the optical lens. More specifically, 4.78 < TTL / f < 5.81.

[0047] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 1.5 < TTL / IH < 2.1. Satisfying the above range ensures that the lens has a larger image surface under the condition of the same total length, can be matched with a larger-size imaging chip to achieve high-definition imaging, and better achieves the balance between the small total length and the large image surface of the lens. More specifically, 1.67 < TTL / IH < 1.85.

[0048] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 50° < FOV / Fno < 65°. Satisfying the above condition is beneficial to expanding the field of view of the lens and increasing the aperture of the lens, realizing the characteristics of wide angle and large aperture of the lens. The wide-angle characteristic can meet the requirements of large-range detection. More specifically, 56.78° < FOV / Fno < 58.9°.

[0049] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 6.5 < IH / EPD < 9.5. Satisfying the above range can increase the width of the light beam entering the optical lens, so that the brightness of the optical lens at the image plane can be improved and the generation of vignetting can be avoided. More specifically, 7.26 < IH / EPD < 8.91.

[0050] In some embodiments, the effective focal length f of the optical lens, the real image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 44° < f×FOV / IH < 67°. Satisfying the above conditional expression, and reasonably limiting the relationship among the focal length, the field of view and the image height of the optical lens is conducive to achieving the balance between the field of view of the optical lens and large-format imaging, and better meets the use requirement of high image quality shooting of the optical lens. More specifically, 48.53° < f×FOV / IH < 61.22°.

[0051] In some embodiments, the half clear aperture d1 of the object side surface of the first lens, the real image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.07 < d1 / (IH / 2) / tan(FOV / 2) < 0.19. Satisfying the above range can ensure the balance among the size, the field of view and the image plane of the optical lens.

[0052] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field of view of the optical lens satisfy: 0.9 < (IH / 2) / (f×θ) < 1.2. Satisfying the above range enables the lens to have a small distortion value and can provide a high-definition imaging effect. More specifically, 0.93 < (IH / 2) / (f×θ) < 1.19.

[0053] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.9 < f1 / f < -1.2; the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 1.5 < R1 / f < 2.5; the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.4 < R2 / f < 0.8. Satisfying the above range, the first lens has appropriate negative focal length and surface shape, which is beneficial to expanding the field of view of the optical lens. More specifically, -1.67 < f1 / f < -1.34; 1.69 < R1 / f < 2.25; 0.49 < R2 / f < 0.74.

[0054] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -28 < f2 / f < -2.8; the curvature radius R3 of the object-side surface of the second lens and the effective focal length f of the optical lens satisfy: -1.7 < R3 / f < -0.9; the curvature radius R4 of the image-side surface of the second lens and the effective focal length f of the optical lens satisfy: -3.7 < R4 / f < -1.2. When the above range is satisfied, the second lens adopts a negative lens and has a proper surface shape, which can further diverge light and increase the field angle of the imaging system. More specifically, -25.46 < f2 / f < -3.67; -1.53 < R3 / f < -1.05; -3.35 < R4 / f < -1.38.

[0055] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.2 < f3 / f < 2.1; the curvature radius R5 of the object-side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.9 < R5 / f < 1.5; the curvature radius R6 of the image-side surface of the third lens and the effective focal length f of the optical lens satisfy: 2.2 < R6 / f < 7.9. When the above range is satisfied, the third lens has an appropriate negative focal length and surface shape, which can control the propagation direction of light paths, provide more reasonable incident angles of light for subsequent lenses, improve relative illuminance uniformity and enhance imaging quality. More specifically, 1.31 < f3 / f < 1.95; 1.02 < R5 / f < 1.33; 2.5 < R6 / f < 7.19.

[0056] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.5 < f4 / f < 1.2. When the above range is satisfied, the fourth lens has a proper optical power, which converges incident light from the front end, is beneficial to correcting aberrations caused by the front-end lens group and distortion at the edge field of view, enables the lens to have small distortion and can provide a high-definition imaging effect. More specifically, 0.62 < f4 / f < 1.06.

[0057] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 1.7 < f6 / f < 7.6. When the above range is satisfied, it facilitates the smooth transition of light, facilitates the correction of astigmatism and field curvature, improves the imaging quality of the optical lens, and ensures the stability of the optical system. More specifically, 1.9 < f6 / f < 6.94.

[0058] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -13.5 < f7 / f < -2. When the above range is satisfied, it facilitates the smooth transition of light, corrects the field curvature and distortion of the optical lens, and improves the imaging quality of the optical lens. More specifically, -12.16 < f7 / f < -2.17.

[0059] In some embodiments, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: 1.2 < f8 / f < 1.9. Meeting the above range is conducive to smooth transition of light, facilitates correction of astigmatism and field curvature, improves the imaging quality of the optical lens, and ensures the stability of the optical system. More specifically, 1.35 < f8 / f < 1.67.

[0060] In some embodiments, the combined focal length f123 of the first lens, the second lens and the third lens and the effective focal length f of the optical lens satisfy: 1.8 < f123 / f < 5.2; the combined focal length f45678 of the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens and the effective focal length f of the optical lens satisfy: 1.6 < f45678 / f < 2.5. Meeting the above range, by reasonably setting the focal lengths of the lens groups before and after the diaphragm, it is beneficial to balance various aberrations generated by the lens group before the diaphragm and improve the overall imaging quality. More specifically, 1.95 < f123 / f < 4.73; 1.78 < f45678 / f < 2.27.

[0061] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0 < f1 / f2 < 0.5; the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -15 < f2 / f3 < -2.1; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 1.6 < f3 / f4 < 2.8; the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -1.4 < f4 / f5 < -1; the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.4 < f5 / f6 < -0.1; the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -1.3 < f6 / f7 < -0.4; the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy: -8.8 < f7 / f8 < -1.3. Meeting the above range is conducive to smooth transition of light, facilitates correction of aberrations of the optical lens, and improves the imaging quality of the optical lens. More specifically, 0.05 < f1 / f2 < 0.43; -13.12 < f2 / f3 < -2.41; 1.82 < f3 / f4 < 2.51; -1.26 < f4 / f5 < -1.14; -0.3 < f5 / f6 < -0.12; -1.17 < f6 / f7 < -0.5; -8.01 < f7 / f8 < -1.44.

[0062] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1<f5 / f<-0.5; the radius of curvature R9 of the object-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -0.7<R9 / f<-0.4; the radius of curvature R10 of the image-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1<R10 / f<5. Satisfying the above ranges allows various aberrations of the optical lens to be sufficiently corrected, improves resolution and achieves high resolution. More specifically, -0.88<f5 / f<-0.54; -0.66<R9 / f<-0.44; 1.28<R10 / f<4.51.

[0063] In some embodiments, the distance BL on the optical axis from the image-side surface of the eighth lens to the imaging surface and the effective focal length f of the optical lens satisfy: 0.3<BL / f<0.4. Satisfying the above condition is beneficial to achieving a short back focal length of the lens, and is beneficial to realizing miniaturization of the lens while ensuring sufficient space for installation of optical elements.

[0064] In some embodiments, the focal length f1 of the first lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: -0.9<f1 / f123<-0.2; the focal length f2 of the second lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: -14<f2 / f123<-0.6; the focal length f3 of the third lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: 0.2<f3 / f123<1.1. Satisfying the above ranges facilitates smooth transition of light, corrects field curvature and distortion of the optical lens, and improves the imaging quality of the optical lens. More specifically, -0.84<f1 / f123<-0.28; -12.99<f2 / f123<-0.66; 0.27<f3 / f123<1.

[0065] In some embodiments, the focal length f5 of the fifth lens and the combined focal length f45678 of the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens satisfy: -0.5<f5 / f45678<-0.2. Satisfying the above range, reasonably setting the proportion of the focal length of the fifth lens in the lens group behind the stop, facilitates smooth transition of light, reduces the difficulty of correcting field curvature and distortion of the optical lens, and improves the imaging quality of the optical lens. More specifically, -0.44<f5 / f45678<-0.26.

[0066] In some embodiments, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: 2.7 < R1 / R2 < 3.8; the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: 0.4 < (R1-R2) / (R1+R2) < 0.6. When the above ranges are satisfied, the first lens has a proper surface shape, which can collect light with large field-of-view angles as much as possible and allow the light to enter the subsequent system smoothly, increasing the luminous flux of the optical lens and effectively expanding the field-of-view range of the optical lens. More specifically, 3.06 < R1 / R2 < 3.49; 0.5 < (R1-R2) / (R1+R2) < 0.56.

[0067] In some embodiments, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 0.3 < R3 / R4 < 0.9; the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: -0.5 < (R3-R4) / (R3+R4) < -0.1. When the above ranges are satisfied, the second lens has a proper surface shape, which can collect light with large field-of-view angles as much as possible and allow the light to enter the subsequent system smoothly, increasing the luminous flux of the optical lens and effectively expanding the field-of-view range of the optical lens. More specifically, 0.4 < R3 / R4 < 0.78; -0.43 < (R3-R4) / (R3+R4) < -0.12.

[0068] In some embodiments, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0.1 < R5 / R6 < 0.5; the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: -0.8 < (R5-R6) / (R5+R6) < -0.3. When the above ranges are satisfied, the third lens has a proper surface shape, which can collect light with large field-of-view angles as much as possible and allow the light to enter the subsequent system smoothly, increasing the luminous flux of the optical lens and effectively expanding the field-of-view range of the optical lens. More specifically, 0.14 < R5 / R6 < 0.42; -0.76 < (R5-R6) / (R5+R6) < -0.41.

[0069] In some embodiments, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: -0.5 < R9 / R10 < -0.1; the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: -0.9 < (R9+R10) / (R9-R10) < -0.4. When the above ranges are satisfied, the fifth lens can have a proper surface shape, which can balance various aberrations generated by the optical lens and improve the imaging quality of the optical lens. More specifically, -0.36 < R9 / R10 < -0.13; -0.76 < (R9+R10) / (R9-R10) < -0.47.

[0070] In some embodiments, the optical lens satisfies the following conditional expressions: 4.5mm<f<6.9mm; 1.7mm<EPD<2.5mm; 26mm<TTL<31mm; 2.5<Fno<3.1; 15°<CRA<21°; 1.8mm<BL<2.2mm; 150°<FOV<180°; 16mm<IH<17mm. In the above conditional expressions, f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the f-number of the optical lens, CRA represents the chief ray angle at the maximum image height of the optical lens, BL represents the distance from the image-side surface of the eighth lens to the imaging plane on the optical axis, FOV represents the maximum field of view of the optical lens, and IH represents the real image height corresponding to the maximum field of view of the optical lens. Satisfying the above ranges, the optical lens has at least one or more advantages such as miniaturization, large image surface, and large field of view. More specifically, 4.99mm<f<6.31mm; 1.83mm<EPD<2.26mm; 27.44mm<TTL<30.19mm; 2.69<Fno<2.91; 16.72°<CRA<19.48°; 1.93mm<BL<2mm; 158°<FOV<171°; 16.36mm<IH<16.6mm.

[0071] In some embodiments, the lenses in the optical lens provided by the present invention may be made of glass or plastic. When the lens is made of plastic, the production cost can be effectively reduced. When the lens is made of glass, the characteristics of low dispersion of glass itself can be used to effectively correct the geometric chromatic aberration of the optical system. In the optical lens provided by the present invention, the first lens, the second lens, the third lens and the eighth lens are made of glass, and the fourth lens, the fifth lens, the sixth lens and the seventh lens are made of plastic or glass, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve imaging quality.

[0072] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens can be spherical lenses or aspheric lenses. Compared with spherical structures, aspheric structures can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lens, and better realizing the miniaturization of the lens. More specifically, in the present invention, the first lens, the second lens, the seventh lens, and the eighth lens are aspheric lenses; the third lens, the fourth lens, the fifth lens, and the sixth lens are spherical lenses or aspheric lenses.

[0073] In various embodiments of the present invention, when an aspheric lens is adopted for a lens, the shape of each aspheric surface of the optical lens satisfies the following equation: ; Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and A, B, C, D, E, and F are the second, fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0074] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0075] Example 1

[0076] Please see Figure 1 The diagram shown is a schematic diagram of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens includes, in sequence along the optical axis from the object side to the imaging plane: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.

[0077] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens L2 has negative optical power, its object side S3 is concave, and its image side S4 is convex. The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens L4 has positive optical power, its object side S7 is convex, and its image side is convex. The fifth lens L5 has negative optical power, its object side is concave, and its image side S9 is concave. The fourth lens L4 and the fifth lens L5 form a cemented lens group with negative optical power, that is, the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8. The sixth lens L6 has positive optical power, its object side S10 is convex, and its image side S11 is convex near the optical axis. The seventh lens L7 has negative optical power. Its object-side surface S12 is convex near the optical axis, and its image-side surface S13 is concave near the optical axis. The eighth lens L8 has positive optical power, its object side S14 is convex, and its image side S15 is convex. The object-side surface S16 and the image-side surface S17 of filter G1 are both planar. The imaging plane S18 is a plane.

[0078] The fourth, fifth, sixth, and seventh lenses are plastic aspherical lenses, the first, second, and eighth lenses are glass aspherical lenses, and the third lens is a glass spherical lens.

[0079] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0080] Table 1-1

[0081] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0082] Table 1-2

[0083] Figure 2 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in each field of view. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of this example is above 0.2 throughout the entire field of view. Within the range of 0–120 lp / mm, the MTF curve decreases smoothly and uniformly from the center to the edge of the field of view, exhibiting good image quality and good detail resolution.

[0084] Example 2

[0085] Please see Figure 3 The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0086] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0087] Table 2-1

[0088] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0089] Table 2-2

[0090] In this embodiment, the MTF curves of the optical lens 200 are as follows: Figure 4 As shown.

[0091] from Figure 4 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating good imaging quality and good detail resolution.

[0092] Example 3

[0093] Please see Figure 5 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The optical lens of this embodiment is roughly the same as that of Embodiment 1. The main difference is that the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0094] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0095] Table 3-1

[0096] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0097] Table 3-2

[0098] In this embodiment, the MTF curve of the optical lens 300 is as follows: Figure 6 As shown.

[0099] from Figure 6 As can be seen, the MTF value of this embodiment is above 0.28 throughout the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating good imaging quality and good detail resolution.

[0100] Example 4

[0101] Please see Figure 7 The figure shows a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0102] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0103] Table 4-1

[0104] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0105] Table 4-2

[0106] In this embodiment, the MTF curves of the optical lens 400 are as follows: Figure 8 As shown.

[0107] from Figure 8 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, which has good imaging quality and good detail resolution.

[0108] Example 5

[0109] Please see Figure 9 The diagram shows a schematic of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The optical lens in this embodiment is generally the same as that in Embodiment 1, except that: the fourth lens L4 and the fifth lens L5 form a cemented lens group with positive optical power; the third lens L3 and the seventh lens L7 are glass aspherical lenses, and the fourth lens L4, the fifth lens L5 and the sixth lens L6 are glass spherical lenses; the optical parameters such as the radius of curvature, aspherical coefficient and thickness of each lens surface are different.

[0110] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0111] Table 5-1

[0112] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0113] Table 5-2

[0114] In this embodiment, the MTF curves of the optical lens 500 are as follows: Figure 10 As shown.

[0115] from Figure 10 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, which has good imaging quality and good detail resolution.

[0116] Example 6

[0117] Please see Figure 11 The figure shows a schematic diagram of the structure of the optical lens 600 provided in Embodiment 6 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the third lens L3 and the seventh lens L7 are glass aspherical lenses, while the fourth lens L4, the fifth lens L5, and the sixth lens L6 are glass spherical lenses. The optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0118] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0119] Table 6-1

[0120] The surface profile parameters of the aspherical lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0121] Table 6-2

[0122] In this embodiment, the MTF curves of the optical lens 600 are as follows: Figure 12 As shown.

[0123] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.25 throughout the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating good imaging quality and good detail resolution.

[0124] Example 7

[0125] Please see Figure 13 The figure shows a schematic diagram of the structure of the optical lens 700 provided in Embodiment 7 of the present invention. The optical lens in this embodiment is generally the same as that in Embodiment 1. The main difference is that the third lens L3 and the seventh lens L7 are glass aspherical lenses, while the fourth lens L4, the fifth lens L5, and the sixth lens L6 are glass spherical lenses. The optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0126] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7-1.

[0127] Table 7-1

[0128] The surface profile parameters of the aspherical lens of the optical lens 700 in Example 7 are shown in Table 7-2.

[0129] Table 7-2

[0130] In this embodiment, the MTF curves of the optical lens 700 are as follows: Figure 14 As shown.

[0131] from Figure 14 As can be seen, the MTF value of this embodiment is above 0.28 throughout the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating good imaging quality and good detail resolution.

[0132] Example 8

[0133] Please see Figure 15 The figure shows a schematic diagram of the structure of the optical lens 800 provided in Embodiment 8 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the third lens L3 and the seventh lens L7 are glass aspherical lenses, while the fourth lens L4, the fifth lens L5, and the sixth lens L6 are glass spherical lenses. The optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0134] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8-1.

[0135] Table 8-1

[0136] The surface profile parameters of the aspherical lens of the optical lens 800 in Example 8 are shown in Table 8-2.

[0137] Table 8-2

[0138] In this embodiment, the MTF curves of the optical lens 800 are as follows: Figure 16 As shown.

[0139] from Figure 16 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, which has good imaging quality and good detail resolution.

[0140] Please refer to Table 9 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, distance BL from the image side of the eighth lens to the imaging plane on the optical axis, and the numerical values ​​corresponding to each conditional expression in each embodiment.

[0141] Table 9

[0142] In summary, the optical lens provided by the present invention uses eight lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as miniaturization, large field of view, large image plane, high pixel count, and high imaging quality.

[0143] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0144] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens comprising eight lenses having optical power, characterized in that, It sequentially comprises from the object side to the imaging surface along the optical axis: a first lens with negative refractive power, the object-side surface of which is convex and the image-side surface of which is concave; a second lens with negative refractive power, the object-side surface of which is concave and the image-side surface of which is convex; a third lens with positive refractive power, the object-side surface of which is convex and the image-side surface of which is concave; a fourth lens with positive refractive power, the object-side surface of which is convex and the image-side surface of which is convex; a fifth lens with negative refractive power, the object-side surface of which is concave and the image-side surface of which is concave; a sixth lens with positive refractive power, the object-side surface of which is convex, and the image-side surface of which is convex near the optical axis; a seventh lens with negative refractive power, the object-side surface of which is convex near the optical axis, and the image-side surface of which is concave near the optical axis; an eighth lens with positive refractive power, the object-side surface of which is convex and the image-side surface of which is convex; wherein, the actual image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.3<IH / f<3.6; the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: 1.7<f1 / f5<3.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.3<TTL / f<6.4; the total optical length TTL of the optical lens and the actual image height IH corresponding to the maximum field of view of the optical lens satisfy: 1.5<TTL / IH<2.

1.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 50°<FOV / Fno<65°; the actual image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 6.5<IH / EPD<9.

5.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the effective focal length f of the optical lens, the actual image height IH corresponding to the maximum field of view of the optical lens and the maximum field of view FOV of the optical lens satisfy: 44°<f×FOV / IH<67°; the clear aperture half-diameter d1 of the object-side surface of the first lens, the actual image height IH corresponding to the maximum field of view of the optical lens and the maximum field of view FOV of the optical lens satisfy: 0.07<d1 / (IH / 2) / tan(FOV / 2)<0.19; the actual image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens and the radian value θ of the maximum half field of view of the optical lens satisfy: 0.9<(IH / 2) / (f×θ)<1.

2.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.9<f1 / f<-1.2; the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 1.5<R1 / f<2.5; the curvature radius R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.4<R2 / f<0.

8.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -28<f2 / f<-2.8; the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: -1.7<R3 / f<-0.9; the curvature radius R4 of the image side surface of the second lens and the effective focal length f of the optical lens satisfy: -3.7<R4 / f<-1.

2.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.2<f3 / f<2.1; the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.9<R5 / f<1.5; the curvature radius R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: 2.2<R6 / f<7.

9.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.5 < f4 / f < 1.2; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 1.7 < f6 / f < 7.6; the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -13.5 < f7 / f < -2; the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: 1.2 < f8 / f < 1.9; the combined focal length f123 of the first lens, the second lens and the third lens and the effective focal length f of the optical lens satisfy: 1.8 < f123 / f < 5.2; the combined focal length f45678 of the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens and the effective focal length f of the optical lens satisfy: 1.6 < f45678 / f < 2.5; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0 < f1 / f2 < 0.5; the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -15 < f2 / f3 < -2.1; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 1.6 < f3 / f4 < 2.8; the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -1.4 < f4 / f5 < -1; the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.4 < f5 / f6 < -0.1; the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -1.3 < f6 / f7 < -0.4; the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy: -8.8 < f7 / f8 < -1.

3.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1 < f5 / f < -0.5; the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -0.7 < R9 / f < -0.4; the curvature radius R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1 < R10 / f < 5.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.59 < IH / f < 3.29; the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: 1.88 < f1 / f5 < 2.76.

Images