Optical lens

Abstract

The application provides an optical lens, which comprises eight lenses in sequence along an optical axis from an object side to an imaging surface, and the eight lenses comprise: a first lens with negative optical power, wherein an image side of the first lens is a concave surface; a second lens with negative optical power, wherein an image side of the second lens is a concave surface; a third lens with positive optical power; a fourth lens with positive optical power, wherein an image side of the fourth lens is a convex surface; a fifth lens with positive optical power, wherein an object side of the fifth lens is a concave surface and an image side of the fifth lens is a convex surface; a sixth lens with negative optical power, wherein an object side of the sixth lens is a concave surface; a seventh lens with positive optical power, wherein an object side of the seventh lens is a concave surface and an image side of the seventh lens is a convex surface; and an eighth lens with negative optical power, wherein an object side of the eighth lens is a convex surface and an image side of the eighth lens is a concave surface. The optical lens provided by the application improves the imaging quality of the optical lens, reduces aberration and improves the imaging quality of the optical lens through reasonable configuration of the surface types of the lenses and reasonable matching of the optical powers.

Description

TECHNICAL FIELD

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

[0002] With the continuous development of existing image processing algorithms and AI technology, optical lenses are widely used in action cameras, vehicle-mounted lenses, smart homes and other fields. However, the optical lens of the existing action camera still has many shortcomings in underwater imaging, such as the decline of imaging quality, poor light transmission performance, and the existing lens imaging target surface is small, which is difficult to meet the market demand.

[0003] Therefore, it is necessary to develop an optical lens with one or more advantages of ultra-wide angle, high imaging quality, high pixels, etc., so as to better meet the high demand of the market for underwater lenses. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages of ultra-wide angle, high pixels, high imaging quality, etc.

[0005] The present application provides an optical lens, which comprises eight lenses in order along the optical axis from the object side to the imaging surface:

[0006] The first lens with negative focal power has a concave image side;

[0007] The second lens with negative focal power has a concave image side;

[0008] The third lens with positive focal power;

[0009] The fourth lens with positive focal power has a convex image side;

[0010] The fifth lens with positive focal power has a concave object side and a convex image side;

[0011] The sixth lens with negative focal power has a concave object side;

[0012] The seventh lens with positive focal power has a concave object side and a convex image side;

[0013] The eighth lens with negative focal power has a convex object side and a concave image side;

[0014] Wherein, the image side curvature radius R10 of the fifth lens and the object side curvature radius R13 of the seventh lens satisfy: -1<(R10-R13) / (R10+R13)<-0.1.

[0015] It is further preferred that a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 51° < FOV / Fno < 69°.

[0016] It is further preferred that an effective focal length f of the optical lens and a back focal length BFL of the optical lens satisfy: BFL / f > 0.8.

[0017] It is further preferred that the effective focal length f of the optical lens and the image-side surface curvature radius R10 of the fifth lens satisfy: R10 / f < -0.1; and the effective focal length f of the optical lens and the object-side surface curvature radius R13 of the seventh lens satisfy: R13 / f < -1.

[0018] It is further preferred that the object-side surface curvature radius R9 of the fifth lens and the image-side surface curvature radius R10 of the fifth lens satisfy: R9 / R10 > 50.

[0019] It is further preferred that the object-side surface curvature radius R13 of the seventh lens and the image-side surface curvature radius R14 of the seventh lens satisfy: 3 < R13 / R14 < 15.

[0020] It is further preferred that the focal length f5 of the fifth lens and the object-side surface curvature radius R9 of the fifth lens satisfy: R9 / f5 < -40; and the focal length f5 of the fifth lens and the image-side surface curvature radius R10 of the fifth lens satisfy: -0.8 < R10 / f5 < -0.2.

[0021] It is further preferred that the focal length f7 of the seventh lens and the object-side surface curvature radius R13 of the seventh lens satisfy: -8 < R13 / f7 < -1; and the focal length f7 of the seventh lens and the image-side surface curvature radius R14 of the seventh lens satisfy: -0.7 < R14 / f7 < -0.2.

[0022] It is further preferred that the object-side surface curvature radius R13 of the seventh lens and the image-side surface curvature radius R14 of the seventh lens satisfy: 0.1 < (R13-R14) / (R13+R14) < 1.

[0023] It is further preferred that the object-side surface curvature radius R9 of the fifth lens and the object-side surface curvature radius R13 of the seventh lens satisfy: 0.7 < (R9-R13) / (R9+R13) < 1.

[0024] The optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of optical power, so that the lens has one or more advantages such as super wide angle, high pixel, and high imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings of which:

[0026] Figure 1 A structural schematic diagram of an optical lens in Embodiment 1 of the present application.

[0027] Figure 2 A field curvature curve diagram of the optical lens in Embodiment 1 of the present application.

[0028] Figure 3 An F-theta distortion curve diagram of the optical lens in Embodiment 1 of the present application.

[0029] Figure 4 A sagittal chromatic aberration curve diagram of the optical lens in Embodiment 1 of the present application.

[0030] Figure 5 An axial aberration curve diagram of the optical lens in Embodiment 1 of the present application.

[0031] Figure 6 An MTF curve diagram of the optical lens in Embodiment 1 of the present application.

[0032] Figure 7 A structural schematic diagram of an optical lens in Embodiment 2 of the present application.

[0033] Figure 8 A field curvature curve diagram of the optical lens in Embodiment 2 of the present application.

[0034] Figure 9 An F-theta distortion curve diagram of the optical lens in Embodiment 2 of the present application.

[0035] Figure 10 A sagittal chromatic aberration curve diagram of the optical lens in Embodiment 2 of the present application.

[0036] Figure 11 An axial aberration curve diagram of the optical lens in Embodiment 2 of the present application.

[0037] Figure 12 An MTF curve diagram of the optical lens in Embodiment 2 of the present application.

[0038] Figure 13 A structural schematic diagram of an optical lens in Embodiment 3 of the present application.

[0039] Figure 14 A field curvature curve diagram of the optical lens in Embodiment 3 of the present application.

[0040] Figure 15 An F-theta distortion curve diagram of the optical lens in Embodiment 3 of the present application.

[0041] Figure 16A vertical color aberration curve of the optical lens in Embodiment 3 of the present application.

[0042] Figure 17 An axial aberration curve of the optical lens in Embodiment 3 of the present application.

[0043] Figure 18 An MTF curve of the optical lens in Embodiment 3 of the present application.

[0044] Figure 19 A structure schematic diagram of the optical lens in Embodiment 4 of the present application.

[0045] Figure 20 A curvature of field curve of the optical lens in Embodiment 4 of the present application.

[0046] Figure 21 An F-θ distortion curve of the optical lens in Embodiment 4 of the present application.

[0047] Figure 22 A vertical color aberration curve of the optical lens in Embodiment 4 of the present application.

[0048] Figure 23 An axial aberration curve of the optical lens in Embodiment 4 of the present application.

[0049] Figure 24 An MTF curve of the optical lens in Embodiment 4 of the present application.

[0050] Figure 25 A structure schematic diagram of the optical lens in Embodiment 5 of the present application.

[0051] Figure 26 A curvature of field curve of the optical lens in Embodiment 5 of the present application.

[0052] Figure 27 An F-θ distortion curve of the optical lens in Embodiment 5 of the present application.

[0053] Figure 28 A vertical color aberration curve of the optical lens in Embodiment 5 of the present application.

[0054] Figure 29 An axial aberration curve of the optical lens in Embodiment 5 of the present application.

[0055] Figure 30 An MTF curve of the optical lens in Embodiment 5 of the present application.

[0056] Figure 31 A structure schematic diagram of the optical lens in Embodiment 6 of the present application.

[0057] Figure 32 A curvature of field curve of the optical lens in Embodiment 6 of the present application.

[0058] Figure 33 F-Theta distortion curve of the optical lens in Embodiment 6 of the present application.

[0059] Figure 34 Curvature of field curve of the optical lens in Embodiment 6 of the present application.

[0060] Figure 35 Axial aberration curve of the optical lens in Embodiment 6 of the present application.

[0061] Figure 36 MTF curve of the optical lens in Embodiment 6 of the present application.

[0062] Figure 37 Structure diagram of the optical lens in Embodiment 7 of the present application.

[0063] Figure 38 Curvature of field curve of the optical lens in Embodiment 7 of the present application.

[0064] Figure 39 F-Theta distortion curve of the optical lens in Embodiment 7 of the present application.

[0065] Figure 40 Curvature of field curve of the optical lens in Embodiment 7 of the present application.

[0066] Figure 41 Axial aberration curve of the optical lens in Embodiment 7 of the present application.

[0067] Figure 42 MTF curve of the optical lens in Embodiment 7 of the present application.

[0068] Figure 43 Structure diagram of the optical lens in Embodiment 8 of the present application.

[0069] Figure 44 Curvature of field curve of the optical lens in Embodiment 8 of the present application.

[0070] Figure 45 F-Theta distortion curve of the optical lens in Embodiment 8 of the present application.

[0071] Figure 46 Curvature of field curve of the optical lens in Embodiment 8 of the present application.

[0072] Figure 47 Axial aberration curve of the optical lens in Embodiment 8 of the present application.

[0073] Figure 48 MTF curve of the optical lens in Embodiment 8 of the present application.

[0074] Figure 49A structure diagram of an optical lens in Embodiment 9 of the present application.

[0075] Figure 50 A field curvature curve of the optical lens in Embodiment 9 of the present application.

[0076] Figure 51 An F-theta distortion curve of the optical lens in Embodiment 9 of the present application.

[0077] Figure 52 A sagittal chromatic aberration curve of the optical lens in Embodiment 9 of the present application.

[0078] Figure 53 An axial chromatic aberration curve of the optical lens in Embodiment 9 of the present application.

[0079] Figure 54 An MTF curve of the optical lens in Embodiment 9 of the present application.

[0080] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0081] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0082] It is to be noted that the expressions first, second, third, etc. in the present specification are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0083] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0084] In this context, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0085] It should also be understood that the use of the terms "including", "including having", "having", "containing", and / or "containing having" when used in this specification intends that existence of stated features, elements and / or components but does not exclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0086] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0087] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0088] The optical lens provided by the embodiments of the present application comprises eight lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as 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.

[0089] In some embodiments, the first lens can have a negative focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof is a concave surface. The second lens can have a negative focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof is a concave surface. The third lens can have a positive focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof is a concave surface or a convex surface. The fourth lens can have a positive focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof is a convex surface. The fifth lens can have a positive focal power, the object side surface thereof is a concave surface, and the image side surface thereof is a convex surface. The sixth lens can have a negative focal power, the object side surface thereof is a concave surface, and the image side surface thereof can be a concave surface or a convex surface. The seventh lens can have a positive focal power, the object side surface thereof is a concave surface, and the image side surface thereof is a convex surface. The eighth lens can have a negative focal power, the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface.

[0090] In some embodiments, the optical lens can further include a stop, which can be located between the fourth lens and the fifth lens. It can be understood that the stop is used to limit the amount of light to change the brightness of the image. In addition, when the stop is located between the fourth lens and the fifth lens, the stop can reasonably distribute the functions of the first lens to the eighth lens, for example, the first lens, the second lens, the third lens and the fourth lens can be used to receive light to a greater extent, and the fifth lens to the eighth lens can be used for the function of correcting aberration, which is conducive to balancing the structure of the entire optical system. In addition, when the stop is located between the fourth lens and the fifth lens, the correction of the stop aberration is facilitated.

[0091] In some embodiments, the optical lens can further include a filter, which is arranged between the eighth lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0092] In some embodiments, the image side surface curvature radius R10 of the fifth lens and the object side surface curvature radius R13 of the seventh lens satisfy: -1 < (R10-R13) / (R10+R13) < -0.1. Satisfying the above range reasonably limits the shape of the image side surface of the fifth lens and the object side surface of the seventh lens, which helps to balance the high-order aberration of the optical lens and improve the imaging quality of the optical lens. More specifically, the image side surface R10 of the fifth lens and the object side surface curvature radius R13 of the seventh lens satisfy: -0.9 < (R10-R13) / (R10+R13) < -0.6.

[0093] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 51° < FOV / Fno < 69°. Satisfying the above range limits the optical lens to have a suitable field of view and aperture value, which can collect light at a large angle and obtain good imaging quality. More specifically, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 56° < FOV / Fno < 62°.

[0094] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: BFL / f > 0.8. Satisfying the above range limits the optical lens to have a suitable back focus, which facilitates reasonable arrangement of the positions of the lenses and reduces the difficulty of processing and assembly. More specifically, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: BFL / f > 0.84.

[0095] In some embodiments, the effective focal length f of the optical lens and the image-side radius of curvature R10 of the fifth lens satisfy: R10 / f <-0.1; the effective focal length f of the optical lens and the object-side radius of curvature R13 of the seventh lens satisfy: R13 / f <-1. Satisfying the above ranges, the shape of the image-side surface of the fifth lens and the object-side surface of the seventh lens are reasonably limited, which helps to reduce the high-order aberration of the optical lens and improve the imaging quality of the optical lens. More specifically, the effective focal length f of the optical lens and the image-side radius of curvature R10 of the fifth lens satisfy: R10 / f <-0.7; the effective focal length f of the optical lens and the object-side radius of curvature R13 of the seventh lens satisfy: -9 < R13 / f < -3.

[0096] In some embodiments, the object-side radius of curvature R9 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy: R9 / R10 > 50. Satisfying the above ranges, the surface shape of the object-side surface and the image-side surface of the fifth lens are reasonably limited, which helps to collect the light transmitted by the front-end lens, makes the light trend stable, and reduces the difficulty of aberration correction of the rear-end lens. More specifically, the object-side radius of curvature R9 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy: R9 / R10 > 100.

[0097] In some embodiments, the object-side radius of curvature R13 of the seventh lens and the image-side radius of curvature R14 of the seventh lens satisfy: 3 < R13 / R14 < 15. Satisfying the above ranges, the surface shape of the object-side surface and the image-side surface of the seventh lens are reasonably limited, which helps to converge the edge field of view light, increase the relative luminance, and improve the imaging clarity of the optical lens. More specifically, the object-side radius of curvature R13 of the seventh lens and the image-side radius of curvature R14 of the seventh lens satisfy: 4.8 < R13 / R14 < 9.6.

[0098] In some embodiments, the focal length f5 of the fifth lens and the object-side radius of curvature R9 of the fifth lens satisfy: R9 / f5 <-40; the focal length f5 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy: -0.8 < R10 / f5 < -0.2. Satisfying the above ranges, the ratio of the object-side radius of curvature and the image-side radius of curvature of the fifth lens to the focal length of the fifth lens is reasonably controlled, which helps to reduce the aberration and improve the imaging quality of the optical lens. More specifically, the focal length f5 of the fifth lens and the object-side radius of curvature R9 of the fifth lens satisfy: R9 / f5 <-55; the focal length f5 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy: -0.6 < R10 / f5 < -0.4.

[0099] In some embodiments, the focal length f7 of the seventh lens and the radius of curvature R13 on the object side of the seventh lens satisfy -8 < R13 / f7 < -1; the focal length f7 of the seventh lens and the radius of curvature R14 on the image side of the seventh lens satisfy -0.7 < R14 / f7 < -0.2. Satisfying the above ranges, the ratios of the radii of curvature on the object side and the image side of the seventh lens to the focal length of the seventh lens are reasonably controlled, which helps to reduce distortion and improve imaging quality. More specifically, the focal length f7 of the seventh lens and the radius of curvature R13 on the object side of the seventh lens satisfy -4.5 < R13 / f7 < -2.0; the focal length f7 of the seventh lens and the radius of curvature R14 on the image side of the seventh lens satisfy -0.5 < R14 / f7 < -0.4.

[0100] In some embodiments, the radius of curvature R13 on the object side of the seventh lens and the radius of curvature R14 on the image side of the seventh lens satisfy 0.1 < (R13-R14) / (R13+R14) < 1. Satisfying the above ranges, the shapes of the object side and the image side of the seventh lens are reasonably limited, which can control the seventh lens to have a proper surface shape, helps to control the light ray trend of the edge field of view, and improves the imaging quality of the edge field of view. More specifically, the radius of curvature R13 on the object side of the seventh lens and the radius of curvature R14 on the image side of the seventh lens satisfy 0.6 < (R13-R14) / (R13+R14) < 0.9.

[0101] In some embodiments, the radius of curvature R9 on the object side of the fifth lens and the radius of curvature R13 on the object side of the seventh lens satisfy 0.7 < (R9-R13) / (R9+R13) < 1. Satisfying the above ranges, the shapes of the object side of the fifth lens and the object side of the seventh lens are reasonably limited, which helps to reduce field curvature and improve imaging quality. More specifically, the radius of curvature R9 on the object side of the fifth lens and the radius of curvature R13 on the object side of the seventh lens satisfy 0.8 < (R9-R13) / (R9+R13) < 1.

[0102] In some embodiments, the effective focal length f of the optical lens and the total track length TTL satisfy 5.8 < TTL / f < 8.7. Satisfying the above ranges, the relationship between the total track length and the focal length is reasonably controlled, and the design and optimization are performed in a reasonable space. More specifically, the effective focal length f of the optical lens and the total track length TTL satisfy 6.5 < TTL / f < 7.9.

[0103] In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy 3.4 < IH / f < 4.9. Satisfying the above ranges, the relationship between the image height and the focal length is reasonably controlled, which helps the optical lens to achieve high-pixel characteristics. More specifically, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy 3.7 < IH / f < 4.5.

[0104] In some embodiments, the maximum field of view FOV of the optical lens, the effective focal length f of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 34° < FOV x f / IH < 49°. Satisfying the above range limits the field of view, focal length and image height of the optical lens within a reasonable range, which helps to balance the large field of view and large image surface, and improves the overall structural stability of the lens. More specifically, the maximum field of view FOV of the optical lens, the effective focal length f of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 38° < FOV x f / IH < 44°.

[0105] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -6.8 < f1 / f < -3.2. Satisfying the above range limits the first lens to have an appropriate negative focal power, which helps the optical lens to collect light rays at a large angle and achieve a large field of view. More specifically, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -6.2 < f1 / f < -3.9.

[0106] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -2.6 < f2 / f < -1.1. Satisfying the above range limits the second lens to have an appropriate negative focal power, which helps to balance the negative focal power of the front end lens, reduces the generation of high-order aberrations, and facilitates the improvement of imaging quality by subsequent lenses. More specifically, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -2.3 < f2 / f < -1.5.

[0107] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 3.9 < f3 / f < 12.8. Satisfying the above range limits the third lens to have an appropriate positive focal power, which helps to stabilize the light path and improve the imaging quality. More specifically, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 4.4 < f3 / f < 11.5.

[0108] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2.2 < f4 / f < 6.9. Satisfying the above range limits the fourth lens to have an appropriate positive focal power, which helps to converge light rays and make as many light rays as possible to the image surface. More specifically, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2.5 < f4 / f < 6.4.

[0109] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1 < f5 / f < 2.3. Satisfying the above range, the fifth lens is defined to have appropriate positive refractive power, which helps to reduce ghosting and improve imaging quality. More specifically, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.5 < f5 / f < 1.9.

[0110] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -2.5 < f6 / f < -1.1. Satisfying the above range, the sixth lens is defined to have appropriate negative refractive power, which helps to increase the imaging area and improve imaging quality. More specifically, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -2.1 < f6 / f < -1.4.

[0111] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.5 < f7 / f < 2.5. Satisfying the above range, the seventh lens is defined to have appropriate positive refractive power, which helps to optimize spherical aberration, converge light rays at the edge field of view, and improve the relative illumination of the lens. More specifically, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.7 < f7 / f < 2.1.

[0112] In some embodiments, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: -35 < f8 / f < -6. Satisfying the above range, the eighth lens is defined to have appropriate negative refractive power, which helps to increase the imaging area and improve imaging quality. More specifically, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: -30 < f8 / f < -9.

[0113] In some embodiments, the combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and the combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy: -7 < f1234 / f5678 < 5. Satisfying the above range, the front and rear lens groups of the optical lens are defined to have appropriate focal length ratios, so that the focal lengths of the lenses of the optical lens are reasonably divided, and the structural stability of the optical lens is improved. More specifically, the combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and the combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy: -4.5 < f1234 / f5678 < 3.0.

[0114] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R9 on the object side of the fifth lens satisfy: R9 / f <-50. Satisfying the above range, the shape of the object side of the fifth lens is reasonably limited, which helps to reduce distortion and ghosting and reduce the difficulty of aberration correction of subsequent lenses. More specifically, the effective focal length f of the optical lens and the radius of curvature R9 on the object side of the fifth lens satisfy: R9 / f <-100.

[0115] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R14 on the image side of the seventh lens satisfy: -1.5 < R14 / f < -0.5. Satisfying the above range, the shape of the image side of the seventh lens is reasonably limited, which helps to balance the field curvature and aberration and improve the imaging quality. More specifically, the effective focal length f of the optical lens and the radius of curvature R14 on the image side of the seventh lens satisfy: -1 < R14 / f < -0.8.

[0116] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R9 on the object side of the fifth lens satisfy: R9 / f <-50. Satisfying the above range, the shape of the object side of the fifth lens is reasonably limited, which helps to reduce distortion and ghosting and reduce the difficulty of aberration correction of subsequent lenses. More specifically, the effective focal length f of the optical lens and the radius of curvature R9 on the object side of the fifth lens satisfy: R9 / f <-100.

[0117] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R9 on the object side of the fifth lens satisfy: R9 / f <-50. Satisfying the above range, the shape of the object side of the fifth lens is reasonably limited, which helps to reduce distortion and ghosting and reduce the difficulty of aberration correction of subsequent lenses. More specifically, the effective focal length f of the optical lens and the radius of curvature R9 on the object side of the fifth lens satisfy: R9 / f <-100.

[0118] In some embodiments, the optical lens satisfies the condition formula: 3.2mm < f < 4.8mm, FOV > 150°, 1.1mm < EPD < 1.6mm, 24mm < TTL < 33mm, 2.5 < Fno < 3.2, 14.2mm < IH < 18.6mm, 10° < CRA < 24°, BFL > 2.9mm, wherein f represents an effective focal length of the optical lens, FOV represents a maximum field of view angle of the optical lens, EPD represents an entrance pupil diameter of the optical lens, TTL represents an optical total length of the optical lens, Fno represents an aperture value of the optical lens, IH represents an image height corresponding to the maximum field of view angle of the optical lens, CRA represents a chief ray incidence angle at the maximum image height of the optical lens, and BFL represents a back focal length of the optical lens. The above condition is satisfied, indicating that the optical lens provided by the embodiments has at least the characteristics of a large field of view angle, a large image surface, and a large back focal length.

[0119] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristics of the glass itself. The optical lens provided by the present application can adopt a full-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0120] 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 adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens. More specifically, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens in the optical lens provided by the present application can adopt an aspherical lens, and the first lens can adopt a spherical lens.

[0121] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0122]

[0123] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0124] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0125] Embodiment 1

[0126] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in embodiment 1 of the application, and the optical lens comprises, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a filter G1.

[0127] The first lens L1 has negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0128] The second lens L2 has negative focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.

[0129] The third lens L3 has positive focal power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface.

[0130] The fourth lens L4 has positive focal power, and the object side surface S7 and the image side surface S8 are both convex surfaces.

[0131] The fifth lens L5 has positive focal power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface.

[0132] The sixth lens L6 has negative focal power, and the object side surface S11 and the image side surface S12 are both concave surfaces.

[0133] The seventh lens L7 has positive focal power, the object side surface S13 is a concave surface, and the image side surface S14 is a convex surface.

[0134] The eighth lens L8 has negative focal power, the object side surface S15 is a convex surface, and the image side surface S16 is a concave surface.

[0135] The object side surface S17 and the image side surface S18 of the filter G1 are both flat surfaces.

[0136] The imaging surface S19 is a flat surface.

[0137] The first lens L1 is a glass spherical lens; the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are glass aspherical lenses.

[0138] The relevant parameters of each lens in the optical lens of Example 1 are shown in Table 1-1.

[0139] Table 1-1

[0140]

[0141]

[0142] The surface profile parameters of the aspherical lens in Example 1 are shown in Table 1-2.

[0143] Table 1-2

[0144] Figure 2 K B C D E F S3 1.97E+00 5.56E-04 -1.75E-05 7.36E-07 -1.31E-08 1.02E-10 S4 -4.08E-01 1.45E-03 -4.00E-05 3.32E-05 -3.50E-06 1.76E-07 S5 3.46E-01 -4.35E-03 1.45E-04 1.83E-05 -1.11E-06 7.89E-09 S6 -4.04E+01 2.14E-03 3.71E-04 -3.12E-05 5.26E-06 -3.37E-07 S7 -4.97E+01 1.74E-02 -9.69E-04 1.53E-04 -1.83E-05 9.81E-07 S8 -2.09E+01 -2.37E-03 1.37E-03 -2.31E-04 3.70E-05 -1.71E-06 S9 -2.71E+01 4.49E-03 -1.04E-03 3.58E-05 -7.60E-06 -9.06E-07 S10 3.42E-03 9.06E-03 -1.05E-03 4.37E-05 -7.95E-07 -3.11E-08 S11 7.98E-01 4.96E-03 -1.73E-03 2.28E-04 -2.54E-05 1.37E-06 S12 1.56E+01 -4.67E-03 2.18E-04 -9.50E-06 5.27E-07 -1.08E-08 S13 -5.05E+01 -2.56E-03 3.01E-04 -1.62E-05 5.03E-07 -6.62E-09 S14 -9.72E-01 -1.37E-03 2.29E-04 -1.69E-05 6.50E-07 -8.93E-09 S15 4.84E+00 -3.99E-03 2.11E-04 -6.22E-06 9.33E-08 -5.74E-10 S16 1.73E+00 -4.05E-03 1.73E-04 -4.33E-06 5.48E-08 -2.87E-10

[0145] In this embodiment, the field curvature curve, F-θ distortion curve, transverse chromatic aberration curve, axial aberration curve, and MTF curve of the optical lens are respectively as follows: Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 2 As shown.

[0146] Figure 3 The field curvature curve of Example 1 is shown, which represents the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.06 mm, indicating that the optical lens can effectively correct the field curvature.

[0147] Figure 4 The F-θ distortion curve of Example 1 is shown, which represents the F-θ distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-θ distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-θ distortion of the optical lens is controlled within 0 to 15%, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image.

[0148] Figure 5The axial chromatic aberration curve of the optical lens in embodiment 1 is shown, which represents the axial chromatic aberration of each wavelength at the imaging surface, the horizontal axis represents the axial chromatic aberration value of each wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, which shows that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0149] Figure 6 The axial chromatic aberration curve of the optical lens in embodiment 1 is shown, which represents the axial chromatic aberration of each wavelength at the imaging surface, the horizontal axis represents the axial chromatic aberration value of each wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, which shows that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0150] Figure 7 The MTF (modulation transfer function) curve of the optical lens in embodiment 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under 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 the embodiment is above 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0151] Embodiment 2

[0152] Please refer to Figure 8 , which is a structural schematic diagram of the optical lens provided in embodiment 2 of the present application, and the main difference between the embodiment and embodiment 1 is that the object side S1 of the first lens L1 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0153] The related parameters of each lens in the optical lens in embodiment 2 are shown in Table 2-1.

[0154] Table 2-1

[0155]

[0156]

[0157] The surface type parameters of the aspherical lens of the optical lens in embodiment 2 are shown in Table 2-2.

[0158] Table 2-2

[0159] Figure 9 K B C D E F S3 2.48E+00 5.98E-04 -1.75E-05 7.39E-07 -1.28E-08 1.15E-10 S4 -4.65E-01 1.40E-03 -4.41E-05 3.28E-05 -3.49E-06 1.74E-07 S5 -1.10E+00 -4.31E-03 1.49E-04 1.85E-05 -1.09E-06 4.27E-09 S6 -4.18E+01 2.18E-03 3.70E-04 -3.18E-05 5.18E-06 -3.44E-07 S7 -5.01E+01 1.73E-02 -9.71E-04 1.54E-04 -1.82E-05 9.82E-07 S8 -2.10E+01 -2.33E-03 1.38E-03 -2.27E-04 3.72E-05 -1.77E-06 S9 -5.00E+01 4.64E-03 -1.01E-03 3.81E-05 -7.38E-06 -7.15E-07 S10 2.48E-03 9.03E-03 -1.05E-03 4.33E-05 -7.98E-07 -3.05E-08 S11 7.98E-01 5.00E-03 -1.74E-03 2.29E-04 -2.54E-05 1.37E-06 S12 1.50E+01 -4.69E-03 2.17E-04 -9.54E-06 5.27E-07 -1.06E-08 S13 -3.33E+01 -2.58E-03 3.01E-04 -1.62E-05 5.02E-07 -6.60E-09 S14 -9.94E-01 -1.32E-03 2.32E-04 -1.68E-05 6.51E-07 -8.94E-09 S15 4.94E+00 -3.96E-03 2.11E-04 -6.22E-06 9.33E-08 -5.72E-10 S16 1.76E+00 -4.12E-03 1.73E-04 -4.33E-06 5.49E-08 -2.87E-10

[0160] In the embodiment, the field curvature curve, the F-theta distortion curve, the axial chromatic aberration curve, the axial aberration curve and the MTF curve of the optical lens are shown in Figs. 1-5, respectively. Figure 10 、 Figure 11 、 Figure 12 、 Figure 8 、 Figure 9

[0161] As can be seen from Fig. 1, the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.1mm-0.05mm, which indicates that the optical lens can well correct the field curvature. Figure 10

[0162] As can be seen from Fig. 2, the F-theta distortion of the optical lens is controlled within 0-15%, and the image compression in the edge angle region is relatively flat, which effectively improves the definition of the expanded image. Figure 11

[0163] As can be seen from Fig. 3, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field and the secondary spectrum of the entire image surface. Figure 12

[0164] As can be seen from Fig. 4, the offset of the axial aberration is controlled within ±0.02mm, which indicates that the optical lens can well correct the axial aberration. Figure 13

[0165] As can be seen from Fig. 5, the MTF value of the embodiment is above 0.48 in the full field of view, and in the range of 0-160lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge field, and has good imaging quality and good detail resolution ability in the low frequency and high frequency conditions. Figure 14

[0166] Embodiment 3

[0167] Please refer to Fig. 3, which shows a structure schematic diagram of the optical lens provided in the embodiment 3 of the present application. Compared with the embodiment 1, the main difference is that: the object side S1 of the first lens L1 is a concave surface; the object side S5 of the third lens L3 is a convex surface; the image side S6 of the third lens L3 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different. Figure 15 The related parameters of each lens in the optical lens in the embodiment 3 are shown in Table 3-1.

[0168] Table 3-1

[0169]

[0170]

[0171] ​​​​​​​

[0172] The surface shape parameters of the aspherical lens of the optical lens in Example 3 are shown in Table 3-2.

[0173] Table 3-2

[0174] Figure 16 K B C D E F S3 4.58E+00 5.42E-04 -1.56E-05 7.50E-07 -1.62E-08 7.56E-11 S4 2.56E-01 -1.35E-03 -8.46E-05 4.07E-05 -6.11E-06 3.38E-07 S5 -5.10E+01 -2.34E-03 -2.75E-04 4.98E-05 -3.00E-06 2.41E-07 S6 5.00E+01 5.94E-03 -2.32E-04 -9.48E-07 2.14E-06 1.09E-07 S7 -3.99E+01 1.48E-02 -3.33E-04 1.48E-04 -2.38E-05 2.09E-06 S8 -2.28E+01 -2.71E-03 1.45E-03 -1.90E-04 4.64E-05 -3.28E-06 S9 4.97E+01 2.56E-03 -9.41E-04 3.72E-05 -2.15E-05 1.42E-06 S10 9.55E-02 7.72E-03 -1.05E-03 3.61E-05 -1.80E-07 -1.44E-07 S11 8.50E-01 5.34E-03 -1.61E-03 2.31E-04 -2.50E-05 1.37E-06 S12 3.36E+01 -4.45E-03 2.32E-04 -9.76E-06 5.00E-07 -1.20E-08 S13 4.10E+01 -3.16E-03 3.20E-04 -1.55E-05 5.10E-07 -6.71E-09 S14 -1.03E+00 -1.16E-03 2.32E-04 -1.65E-05 6.63E-07 -9.14E-09 S15 3.87E+00 -3.92E-03 2.14E-04 -6.20E-06 9.26E-08 -5.89E-10 S16 1.78E+00 -4.19E-03 1.77E-04 -4.31E-06 5.43E-08 -2.96E-10

[0175] In the present embodiment, the field curvature curve, the F-theta distortion curve, the axial chromatic aberration curve, the axial aberration curve and the MTF curve of the optical lens are shown in Figure 17 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 respectively.

[0176] As can be seen from Figure 18 , the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.2mm-0.05mm, which shows that the optical lens can well correct the field curvature.

[0177] As can be seen from Figure 14 , the F-theta distortion of the optical lens is controlled within 0-20%, and the image compression in the edge angle region is relatively gentle, which effectively improves the definition of the expanded image.

[0178] As can be seen from Figure 15 , the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, which shows that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0179] As can be seen from Figure 16 , the offset of the axial aberration is controlled within ±0.04mm, which shows that the optical lens can well correct the axial aberration.

[0180] As can be seen from Figure 17 , the MTF value of the present embodiment is above 0.4 in the full field of view, and in the range of 0-160lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0181] Example 4

[0182] Please refer to Figure 18 , which is a structural schematic diagram of the optical lens provided in Example 4 of the present application, and the main difference between the present embodiment and Example 1 is that the object side S5 of the third lens L3 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0183] The related parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0184] Table 4-1

[0185]

[0186] The surface shape parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0187] Table 4-2

[0188] Figure 19 K B C D E F S3 1.12E+00 5.19E-04 -1.61E-05 7.41E-07 -1.63E-08 7.69E-11 S4 2.64E-01 -1.24E-03 -9.38E-05 4.03E-05 -6.09E-06 3.25E-07 S5 -4.93E+01 -2.34E-03 -2.78E-04 4.99E-05 -2.93E-06 2.56E-07 S6 -5.00E+01 5.90E-03 -2.29E-04 -1.21E-06 2.08E-06 1.17E-07 S7 -5.16E+01 1.48E-02 -3.49E-04 1.48E-04 -2.38E-05 2.03E-06 S8 -2.28E+01 -2.68E-03 1.46E-03 -1.90E-04 4.58E-05 -3.37E-06 S9 4.58E+01 2.48E-03 -9.50E-04 3.58E-05 -2.18E-05 1.43E-06 S10 9.31E-02 7.71E-03 -1.04E-03 3.60E-05 -2.84E-07 -1.55E-07 S11 8.48E-01 5.35E-03 -1.61E-03 2.31E-04 -2.50E-05 1.37E-06 S12 3.35E+01 -4.45E-03 2.32E-04 -9.72E-06 5.00E-07 -1.20E-08 S13 4.17E+01 -3.11E-03 3.20E-04 -1.55E-05 5.08E-07 -6.80E-09 S14 -1.03E+00 -1.19E-03 2.27E-04 -1.66E-05 6.63E-07 -9.10E-09 S15 4.08E+00 -3.88E-03 2.14E-04 -6.20E-06 9.27E-08 -5.87E-10 S16 1.81E+00 -4.04E-03 1.77E-04 -4.32E-06 5.42E-08 -2.98E-10

[0189] In this embodiment, the field curvature curve, F-theta distortion curve, axial chromatic aberration curve, axial aberration curve and MTF curve of the optical lens are shown in Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 respectively.

[0190] As can be seen from Figure 20 , the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.15mm~0.1mm, which shows that the optical lens can well correct the field curvature.

[0191] As can be seen from Figure 21 , the F-theta distortion of the optical lens is controlled within 0~20%, and the image compression in the edge angle region is relatively flat, which effectively improves the definition of the expanded image.

[0192] As can be seen from Figure 22 , the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, which shows that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0193] As can be seen from Figure 23 , the offset of the axial aberration is controlled within-0.01~0.04mm, which shows that the optical lens can well correct the axial aberration.

[0194] As can be seen from Figure 24 , the MTF value of this embodiment is above 0.4 in the full field of view, and in the range of 0~160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0195] Example 5

[0196] Please refer to Figure 25, which is a structural schematic view of the optical lens provided in Embodiment 5 of the present application. Compared with Embodiment 1, the main difference is that the object side S7 of the fourth lens L4 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0197] The related parameters of each lens in the optical lens in Embodiment 5 are shown in Table 5-1.

[0198] Table 5-1

[0199]

[0200] The surface type parameters of the aspherical lens of the optical lens in Embodiment 5 are shown in Table 5-2.

[0201] Table 5-2

[0202]

[0203]

[0204] In this embodiment, the field curvature curve, F-θ distortion curve, axial chromatic aberration curve, axial aberration curve and MTF curve of the optical lens are shown in Figure 26 、 Figure 27 、 Figure 28 、 Figure 29 、 Figure 30 respectively.

[0205] As can be seen from Figure 26 , the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.1mm-0.05mm, which indicates that the optical lens can well correct the field curvature.

[0206] As can be seen from Figure 27 , the F-θ distortion of the optical lens is controlled within 0-15%, and the image compression in the edge angle region is relatively flat, which effectively improves the definition of the expanded image.

[0207] As can be seen from Figure 28 , the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, which indicates that the optical lens can very well correct the chromatic aberration of the edge field of view and the second spectrum of the entire image surface.

[0208] As can be seen from Figure 29 , the offset of the axial aberration is controlled within ±0.03mm, which indicates that the optical lens can well correct the axial aberration.

[0209] As can be seen from Figure 30As can be seen, the MTF value of this embodiment is above 0.38 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0210] Example 6

[0211] Please see Figure 31 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side S1 of the first lens L1 is concave; the object side S5 of the third lens L3 is convex; the image side S6 of the third lens L3 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0212] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0213] Table 6-1

[0214]

[0215]

[0216] The surface profile parameters of the aspherical lens in the optical lens of Example 6 are shown in Table 6-2.

[0217] Table 6-2

[0218] Figure 32 K B C D E F S3 2.24E+00 5.24E-04 -1.60E-05 7.43E-07 -1.63E-08 8.19E-11 S4 2.62E-01 -1.26E-03 -8.85E-05 4.14E-05 -6.09E-06 3.18E-07 S5 -5.10E+01 -2.32E-03 -2.76E-04 4.98E-05 -2.94E-06 2.57E-07 S6 -5.06E+01 5.90E-03 -2.29E-04 -1.34E-06 2.10E-06 1.19E-07 S7 -4.70E+01 1.48E-02 -3.49E-04 1.48E-04 -2.38E-05 2.02E-06 S8 -2.30E+01 -2.68E-03 1.46E-03 -1.91E-04 4.60E-05 -3.37E-06 S9 -5.09E+01 2.56E-03 -9.58E-04 3.47E-05 -2.16E-05 1.45E-06 S10 9.48E-02 7.74E-03 -1.04E-03 3.59E-05 -2.67E-07 -1.56E-07 S11 8.49E-01 5.36E-03 -1.61E-03 2.31E-04 -2.50E-05 1.37E-06 S12 3.31E+01 -4.46E-03 2.32E-04 -9.73E-06 5.01E-07 -1.20E-08 S13 4.17E+01 -3.12E-03 3.20E-04 -1.55E-05 5.09E-07 -6.72E-09 S14 -1.05E+00 -1.13E-03 2.29E-04 -1.66E-05 6.63E-07 -9.11E-09 S15 4.16E+00 -3.85E-03 2.14E-04 -6.20E-06 9.27E-08 -5.87E-10 S16 1.81E+00 -4.04E-03 1.77E-04 -4.32E-06 5.43E-08 -2.97E-10

[0219] In this embodiment, the field curvature curve, F-θ distortion curve, transverse chromatic aberration curve, axial aberration curve, and MTF curve of the optical lens are respectively as follows: Figure 33 , Figure 34 , Figure 35 , Figure 36 , Figure 32 As shown.

[0220] from Figure 33 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.15mm to 0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0221] from Figure 34 As can be seen, the F-θ distortion of the optical lens is controlled within 0 to 20%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0222] from Figure 35It can be seen from the above table that the maximum and minimum axial chromatic aberration is controlled within ± 1.5 μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0223] From the above table, it can be seen that the maximum and minimum axial chromatic aberration is controlled within ± 1.5 μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane. Figure 36 From the above table, it can be seen that the maximum and minimum axial chromatic aberration is controlled within ± 1.5 μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0224] Figure 37 From the above table, it can be seen that the maximum and minimum axial chromatic aberration is controlled within ± 1.5 μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0225] Example 7

[0226] Please refer to Figure 38 , which is a structural schematic diagram of the optical lens provided in the embodiment 7 of the present application. Compared with the embodiment 1, the main difference is that the object side S1 of the first lens L1 is a concave surface; the object side S7 of the fourth lens L4 is a concave surface; the image side S12 of the sixth lens L6 is a convex surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0227] The related parameters of each lens in the optical lens in the embodiment 7 are shown in Table 7-1.

[0228] Table 7-1

[0229]

[0230]

[0231] The surface type parameters of the aspheric lens of the optical lens in the embodiment 7 are shown in Table 7-2.

[0232] Table 7-2

[0233] Figure 39 K B C D E F S3 1.51E+00 4.22E-04 -2.19E-05 8.25E-07 -1.40E-08 1.32E-10 S4 4.48E-02 5.10E-04 -1.60E-04 3.57E-05 -3.69E-06 1.38E-07 S5 7.35E+00 -4.76E-03 1.46E-04 2.10E-05 -1.05E-06 -7.12E-10 S6 -2.33E+01 2.01E-03 3.42E-04 -3.49E-05 5.29E-06 -3.27E-07 S7 -4.27E+01 1.90E-02 -9.39E-04 1.50E-04 -2.00E-05 1.30E-06 S8 -1.97E+01 -2.94E-03 1.52E-03 -2.02E-04 3.42E-05 -6.86E-07 S9 1.74E+01 3.80E-03 -7.06E-04 3.34E-05 -7.00E-06 -1.30E-07 S10 3.07E-02 8.99E-03 -1.12E-03 4.81E-05 -2.38E-07 -7.10E-08 S11 8.53E-01 3.99E-03 -1.72E-03 2.29E-04 -2.52E-05 1.42E-06 S12 -4.01E+01 -4.89E-03 2.20E-04 -9.35E-06 5.16E-07 -1.16E-08 S13 -7.95E+00 -2.56E-03 3.03E-04 -1.62E-05 4.99E-07 -6.85E-09 S14 -9.82E-01 -1.39E-03 2.41E-04 -1.71E-05 6.49E-07 -8.54E-09 S15 7.48E+00 -4.11E-03 2.11E-04 -6.25E-06 9.28E-08 -5.70E-10 S16 1.78E+00 -4.28E-03 1.71E-04 -4.33E-06 5.49E-08 -2.88E-10

[0234] In the embodiment, the field curvature curve, the F-θ distortion curve, the axial chromatic aberration curve, the axial aberration curve and the MTF curve of the optical lens are shown in Figure 40 、 Figure 41 、 Figure 42 、 Figure 38 、 Figure 39 .

[0235] From the above table, it can be seen that the maximum and minimum axial chromatic aberration is controlled within ± 1.5 μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane. Figure 40 ​It can be seen from the table that the field curvature of the meridional image plane and the sagittal image plane is controlled within-0.15mm~0.05mm, which indicates that the optical lens can well correct the field curvature.

[0236] From the table, it can be seen that the F-theta distortion of the optical lens is controlled within 0~15%, and the image compression in the edge angle region is relatively gentle, thereby effectively improving the definition of the expanded image. Figure 41

[0237] From the table, it can be seen that the sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, which indicates that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane. Figure 42

[0238] From the table, it can be seen that the offset of the axial aberration is controlled within ±0.02mm, which indicates that the optical lens can well correct the axial aberration. Figure 43 From the table, it can be seen that the MTF value of the embodiment is above 0.45 within the full field of view, and within the range of 0~160lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0239] Figure 44 Embodiment 8

[0240] Please refer to Fig. 8, which is a structural schematic diagram of the optical lens provided in the embodiment 8 of the present application, and compared with the embodiment 1, the main difference is that: the object side S1 of the first lens L1 is a concave surface; the object side S5 of the third lens L3 is a convex surface; the object side S7 of the fourth lens L4 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0241] Please refer to Fig. 8, which is a structural schematic diagram of the optical lens provided in the embodiment 8 of the present application, and compared with the embodiment 1, the main difference is that: the object side S1 of the first lens L1 is a concave surface; the object side S5 of the third lens L3 is a convex surface; the object side S7 of the fourth lens L4 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different. Figure 45 The related parameters of each lens in the optical lens in the embodiment 8 are shown in Table 8-1.

[0242] Table 8-1

[0243]

[0244] The surface type parameters of the aspheric lens of the optical lens in the embodiment 8 are shown in Table 8-2.

[0245] Table 8-2

[0246]

[0247]

[0248]

[0249] ​​​​In this embodiment, the field curvature curve, F-θ distortion curve, transverse chromatic aberration curve, axial aberration curve, and MTF curve of the optical lens are respectively as follows: Figure 46 , Figure 47 , Figure 48 , Figure 44 , Figure 45 As shown.

[0250] from Figure 46 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.15mm to 0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0251] from Figure 47 As can be seen, the F-θ distortion of the optical lens is controlled within -5% to 10%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0252] from Figure 48 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens can correct the chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane very well.

[0253] from Figure 49 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens can effectively correct axial aberration.

[0254] from Figure 50 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0255] Example 9

[0256] Please see Figure 51 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 9 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object-side surface S3 of the second lens L2 is concave; the object-side surface S5 of the third lens L3 is convex; the object-side surface S7 of the fourth lens L4 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0257] The relevant parameters of each lens in the optical lens of Example 9 are shown in Table 9-1.

[0258] Table 9-1

[0259]

[0260] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 9 are shown in Table 9-2.

[0261] Table 9-2

[0262]

[0263]

[0264] In this embodiment, the field curvature curve, F-theta distortion curve, axial chromatic aberration curve, axial aberration curve and MTF curve of the optical lens are shown in FIGS. 9-2, 9-3, 9-4, 9-5 and 9-6, respectively. Figure 52 、 Figure 53 、 Figure 54 、 Figure 50 、 Figure 51

[0265] As can be seen from FIG. 9-2, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.15mm-0.06mm, which indicates that the optical lens can well correct the field curvature. Figure 52

[0266] As can be seen from FIG. 9-3, the F-theta distortion of the optical lens is controlled within 0-15%, and the image compression in the edge angle region is relatively flat, which effectively improves the definition of the expanded image. Figure 53

[0267] As can be seen from FIG. 9-4, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface. Figure 54

[0268] As can be seen from FIG. 9-5, the offset of the axial aberration is controlled within ±0.03mm, which indicates that the optical lens can well correct the axial aberration. ​

[0269] As can be seen from FIG. 9-6, the MTF value of the optical lens in this embodiment is above 0.4 in the full field of view, and in the range of 0-160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency. ​

[0270] Please refer to Table 10, the optical properties corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view angle FOV of the optical lens, and the numerical values corresponding to each conditional expression in each embodiment.

[0271] Table 10

[0272] ​​​​​​

[0273]

[0274] In summary of the above embodiments, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of optical power, so that the lens has one or more advantages such as ultra-wide angle, high pixel, and high imaging quality. The optical lens of the present application can realize lens imaging underwater and has good imaging effect.

[0275] In the description of the present specification, the description of the terms “one embodiment”, “some embodiments”, “an example”, “a specific example”, or “some examples” and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0276] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, eight pieces of lenses in total, characterized in that, In order from the object side to the imaging plane along the optical axis, comprises successively: a first lens with negative refractive power, whose image side surface is a concave surface; a second lens with negative refractive power, whose image side surface is a concave surface; a third lens with positive refractive power; a fourth lens with positive refractive power, whose image side surface is a convex surface; a fifth lens with positive refractive power, whose object side surface is a concave surface and whose image side surface is a convex surface; a sixth lens with negative refractive power, whose object side surface is a concave surface; a seventh lens with positive refractive power, whose object side surface is a concave surface and whose image side surface is a convex surface; an eighth lens with negative refractive power, whose object side surface is a convex surface and whose image side surface is a concave surface; wherein the image side surface curvature radius R10 of the fifth lens and the object side surface curvature radius R13 of the seventh lens satisfy: -1 < (R10-R13) / (R10+R13) < -0.1; the maximum field of view FOV of the optical lens, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 34° < FOVxf / IH < 49°; the effective focal length f of the optical lens and the total track length TTL satisfy: 5.8 < TTL / f < 8.

7.

2. The optical lens of claim 1, wherein, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 51° < FOV / Fno < 69°; the image side surface curvature radius R10 of the fifth lens and the object side surface curvature radius R13 of the seventh lens satisfy: -0.80 ≤ (R10-R13) / (R10+R13) ≤ -0.68; the maximum field of view FOV of the optical lens, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 38° < FOVxf / IH < 44°; the effective focal length f of the optical lens and the total track length TTL satisfy: 6.5 < TTL / f < 7.

9.

3. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.16 ≥ BFL / f > 0.

8.

4. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the image side surface curvature radius R10 of the fifth lens satisfy: -0.90 ≤ R10 / f < -0.1; the effective focal length f of the optical lens and the object side surface curvature radius R13 of the seventh lens satisfy: -9 < R13 / f < -1.

5. The optical lens of claim 1, wherein, the object side surface curvature radius R9 of the fifth lens and the image side surface curvature radius R10 of the fifth lens satisfy: R9 / R10 > 50.

6. The optical lens of claim 1, wherein, the object side surface curvature radius R13 of the seventh lens and the image side surface curvature radius R14 of the seventh lens satisfy: 3 < R13 / R14 < 15.

7. The optical lens of claim 1, wherein, the focal length f5 of the fifth lens and the object side surface curvature radius R9 of the fifth lens satisfy: R9 / f5 < -40; the focal length f5 of the fifth lens and the image side surface curvature radius R10 of the fifth lens satisfy: -0.8 < R10 / f5 < -0.

2.

8. The optical lens of claim 1, wherein, the focal length f7 of the seventh lens and the object side surface curvature radius R13 of the seventh lens satisfy: -8 < R13 / f7 < -1; the focal length f7 of the seventh lens and the image side surface curvature radius R14 of the seventh lens satisfy: -0.7 < R14 / f7 < -0.

2.

9. The optical lens of claim 1, wherein, The object-side surface curvature radius R13 of the seventh lens and the image-side surface curvature radius R14 of the seventh lens satisfy: 0.1<(R13-R14) / (R13+R14)<1.

10. The optical lens of claim 1, wherein, The object-side surface curvature radius R9 of the fifth lens and the object-side surface curvature radius R13 of the seventh lens satisfy: 0.7<(R9-R13) / (R9+R13)<1.

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