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 object side of the second lens is a convex surface and an image side of the second lens is a concave surface; a third lens with positive optical power, wherein an object side of the third lens is a concave surface and an image side of the third lens is a convex surface; a fourth lens with positive optical power, wherein an object side of the fourth lens is a concave surface and 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 image side of the seventh lens is a convex surface; and an eighth lens with negative optical power. 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 type of each lens and reasonable matching of optical power.

Description

Technical Field

[0001] This invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Technology

[0002] With the continuous advancement of existing image processing algorithms and AI technologies, optical lenses are widely used in various fields such as action cameras, automotive lenses, and smart homes. However, existing action camera optical lenses still have many shortcomings in underwater imaging, such as decreased image quality; poor light transmission performance, making them unable to adapt to dark environments; and the small imaging target area of ​​existing lenses, which makes it difficult to meet market demands.

[0003] Therefore, it is necessary to develop an optical lens with one or more advantages such as ultra-wide angle, high image quality, and high pixel count, so as to better meet the market's high demand for underwater lenses. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an optical lens that has one or more advantages such as ultra-wide angle, high pixel count, and high image quality.

[0005] This invention provides an optical lens comprising eight lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0006] The first lens with negative optical power has a concave image-side surface.

[0007] A second lens with negative optical power has a convex object side and a concave image side.

[0008] A third lens with positive optical power has a concave object side and a convex image side.

[0009] The fourth lens with positive optical power has a concave object side and a convex image side.

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

[0011] The sixth lens has negative optical power and its object side is concave.

[0012] The seventh lens, which has positive optical power, has a convex image-side surface;

[0013] An eighth lens with negative optical power;

[0014] Wherein, the effective focal length f of the optical lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: R9 / f<-1.

[0015] Further preferably, the maximum field of view (FOV) of the optical lens and the aperture value (Fno) of the optical lens satisfy: 50° <FOV / Fno<65°。

[0016] Further preferably, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: BFL / f>0.8.

[0017] Further preferably, the effective focal length f of the optical lens and the object-side radius of curvature R7 of the fourth lens satisfy: R7 / f < -5.5; the effective focal length f of the optical lens and the image-side radius of curvature R8 of the fourth lens satisfy: -2.3. <R8 / f<-1.2。

[0018] Further preferably, the effective focal length f of the optical lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: -1.5 <R10 / f<-0.5。

[0019] Further preferably, 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>1.

[0020] Further preferably, the focal length f4 of the fourth lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: R7 / f4 < -1.2; the focal length f4 of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: -0.7. <R8 / f4<-0.3。

[0021] Further preferably, the focal length f5 of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: R9 / f5<-1.

[0022] Further preferably, the object-side surface curvature radius R7 of the fourth lens and the object-side surface curvature radius R9 of the fifth lens satisfy: -1<(R7-R9) / (R7+R9)<0.

[0023] Further preferably, the half-aperture sagitta Sag9 of the object-side surface of the fifth lens satisfies: 0 <Sag9<0.05mm。

[0024] The optical lens provided by this invention improves the imaging quality, reduces aberrations, and enhances the imaging quality of the optical lens through the reasonable configuration of each lens surface shape and the 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. Attached Figure Description

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

[0026] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0027] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 3 This is the F-θ distortion curve of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 4 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 5 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 6 This is an MTF curve of the optical lens in Embodiment 1 of the present invention.

[0032] Figure 7 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0033] Figure 8 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 9 This is the F-θ distortion curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0036] Figure 11 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0037] Figure 12 This is the MTF curve of the optical lens in Embodiment 2 of the present invention.

[0038] Figure 13 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 14 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0040] Figure 15 This is the F-θ distortion curve of the optical lens in Embodiment 3 of the present invention.

[0041] Figure 16 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0042] Figure 17 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0043] Figure 18 This is the MTF curve of the optical lens in Embodiment 3 of the present invention.

[0044] Figure 19 This is a schematic diagram of the optical lens in Embodiment 4 of the present invention.

[0045] Figure 20 This is a field curvature curve diagram of the optical lens in Embodiment 4 of the present invention.

[0046] Figure 21 This is the F-θ distortion curve of the optical lens in Embodiment 4 of the present invention.

[0047] Figure 22 This is a chromatic aberration curve of the optical lens in Embodiment 4 of the present invention.

[0048] Figure 23 This is an axial aberration curve of the optical lens in Embodiment 4 of the present invention.

[0049] Figure 24 This is the MTF curve of the optical lens in Embodiment 4 of the present invention.

[0050] Figure 25 This is a schematic diagram of the optical lens structure in Embodiment 5 of the present invention.

[0051] Figure 26 This is a field curvature curve diagram of the optical lens in Embodiment 5 of the present invention.

[0052] Figure 27 This is the F-θ distortion curve of the optical lens in Embodiment 5 of the present invention.

[0053] Figure 28 This is a chromatic aberration curve of the optical lens in Embodiment 5 of the present invention.

[0054] Figure 29 This is an axial aberration curve of the optical lens in Embodiment 5 of the present invention.

[0055] Figure 30 This is the MTF curve of the optical lens in Embodiment 5 of the present invention.

[0056] Figure 31 This is a schematic diagram of the optical lens in Embodiment 6 of the present invention.

[0057] Figure 32 This is a field curvature curve diagram of the optical lens in Embodiment 6 of the present invention.

[0058] Figure 33 This is the F-θ distortion curve of the optical lens in Embodiment 6 of the present invention.

[0059] Figure 34This is a chromatic aberration curve of the optical lens in Embodiment 6 of the present invention.

[0060] Figure 35 This is an axial aberration curve of the optical lens in Embodiment 6 of the present invention.

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

[0062] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] The optical lens provided in this embodiment of the invention has a total of eight lenses, which are arranged sequentially from the object side to the imaging plane along the optical axis as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens.

[0071] In some embodiments, the first lens may have negative optical power, its object-side surface may be concave or convex, and its image-side surface may be concave. The second lens may have negative optical power, its object-side surface may be convex, and its image-side surface may be concave. The third lens may have positive optical power, its object-side surface may be concave, and its image-side surface may be convex. The fourth lens may have positive optical power, its object-side surface may be concave, and its image-side surface may be convex. The fifth lens may have positive optical power, its object-side surface may be concave, and its image-side surface may be convex. The sixth lens may have negative optical power, its object-side surface may be concave, and its image-side surface may be either concave or convex. The seventh lens may have positive optical power, its object-side surface may be either concave or convex, and its image-side surface may be convex. The eighth lens may have negative optical power, its object-side surface may be either concave or convex, and its image-side surface may be either concave or convex.

[0072] In some embodiments, the optical lens may further include an aperture, which may be located between the fourth lens and the fifth lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the image. In addition, when the aperture is located between the fourth lens and the fifth lens, the aperture 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 to correct aberrations, which is beneficial to balancing the structure of the entire optical system. In addition, when the aperture is located between the fourth lens and the fifth lens, it is convenient to correct the aperture aberration.

[0073] In some embodiments, the optical lens may further include a filter, which is disposed between the eighth lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0074] In some embodiments, the effective focal length f of the optical lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: R9 / f < -1. Meeting the above range and reasonably defining the shape of the object side surface of the fifth lens is beneficial to reducing ghost images and reducing high-order aberrations, thereby improving the imaging quality of the optical lens. More specifically, the effective focal length f of the optical lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: R9 / f < -50.

[0075] In some embodiments, the maximum field of view FOV of the optical lens and the f-number Fno of the optical lens satisfy: 50° < FOV / Fno < 65°. Meeting the above range and defining that the optical lens has an appropriate field of view and f-number can collect light at large angles and obtain good imaging quality. More specifically, the maximum field of view FOV of the optical lens and the f-number Fno of the optical lens satisfy: 56° < FOV / Fno < 60°.

[0076] 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. Meeting the above range and defining that the optical lens has an appropriate back focal length is convenient for reasonably arranging the positions of each lens, and at the same time reduces the processing and assembly difficulty. More specifically, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.8 < BFL / f < 1.1.

[0077] In some embodiments, the effective focal length f of the optical lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: R7 / f < -5.5. Meeting the above range and reasonably defining the shape of the object side surface of the fourth lens is beneficial to reducing the distortion generated by the front-end lens and at the same time reducing the distortion correction difficulty of the rear-end lens. More specifically, the effective focal length f of the optical lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: R7 / f < -6.2.

[0078] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -2.3 < R8 / f < -1.2. Satisfying the above range and reasonably defining the shape of the image side surface of the fourth lens is beneficial to correcting the spherical aberration of the optical lens and improving the imaging quality of the optical lens. More specifically, the effective focal length f of the optical lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -2.0 < R8 / f < -1.6.

[0079] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1.5 < R10 / f < -0.5. Satisfying the above range and reasonably defining the shape of the image side surface of the fifth lens is beneficial to achieving high pixel characteristics and realizing high-quality imaging. More specifically, the effective focal length f of the optical lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1.5 < R10 / f < -0.5.

[0080] 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: R9 / R10 > 1. Satisfying the above range and reasonably defining the shapes of the object side surface and the image side surface of the fifth lens is beneficial to reducing ghost images, reducing higher-order aberrations, and improving the imaging quality of the optical lens. More specifically, 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: R9 / R10 > 50.

[0081] In some embodiments, the focal length f4 of the fourth lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: R7 / f4 < -1.2; the focal length f4 of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -0.7 < R8 / f4 < -0.3. Satisfying the above range and reasonably controlling the ratios of the radii of curvature of the object side surface and the image side surface of the fourth lens to the focal length of the fourth lens respectively helps to further optimize astigmatism and field curvature and reduce the difficulty of correcting higher-order aberrations of subsequent lenses. More specifically, the focal length f4 of the fourth lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: -31 < R7 / f4 < -1.5; the focal length f4 of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -0.6 < R8 / f4 < -0.4.

[0082] In some embodiments, the focal length f5 of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: R9 / f5 < -1. Satisfying the above range and reasonably controlling the ratio of the radius of curvature of the object side surface of the fifth lens to the focal length of the fifth lens helps to balance aberrations and improve imaging quality. More specifically, the focal length f5 of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: R9 / f5 < -50.

[0083] In some embodiments, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: -1 < (R7 - R9) / (R7 + R9) < 0. Meeting the above range and reasonably controlling the shapes of the object side surfaces of the fourth lens and the fifth lens helps to keep the light path stable, reduce the deflection angle of the light in the marginal field of view, and also helps to achieve high-pixel imaging. More specifically, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: -1 < (R7 - R9) / (R7 + R9) < -0.15.

[0084] In some embodiments, the sagittal height Sag9 of the clear aperture semi-diameter of the object side surface of the fifth lens satisfies: 0 < Sag9 < 0.05 mm. Meeting the above range and reasonably restricting the sagittal height of the object side surface of the fifth lens can effectively reduce ghost images and improve the imaging quality of the optical lens. More specifically, the sagittal height Sag9 of the clear aperture semi-diameter of the object side surface of the fifth lens satisfies: 0.001 mm < Sag9 < 0.02 mm.

[0085] In some embodiments, the effective focal length f of the optical lens and the overall optical length TTL satisfy: 6.7 < TTL / f < 9.5. Meeting the above range and reasonably controlling the relationship between the overall optical length and the focal length provides a reasonable space for design and optimization. More specifically, the effective focal length f of the optical lens and the overall optical length TTL satisfy: 7.4 < TTL / f < 8.5.

[0086] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle satisfy: 3.8 < IH / f < 4.9. Meeting the above range and reasonably controlling the relationship between the image height and the focal length helps the optical lens to achieve high-pixel characteristics. More specifically, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle satisfy: 4.1 < IH / f < 4.7.

[0087] In some embodiments, the maximum field of view angle FOV of the optical lens, the effective focal length f of the optical lens, and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 31° < FOV × f / IH < 45°. Meeting the above range and limiting the field of view angle, focal length, and image height of the optical lens within a reasonable range helps to balance the large field of view angle and the large image plane and improve the overall structural stability of the lens. More specifically, the maximum field of view angle FOV of the optical lens, the effective focal length f of the optical lens, and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 36° < FOV × f / IH < 41°.

[0088] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -5.1 < f1 / f < -3.5. Meeting the above range, which defines that the first lens has an appropriate negative optical power, helps the optical lens collect light at large angles and achieve the characteristic of a large field of view angle. More specifically, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -4.7 < f1 / f < -3.9.

[0089] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -2.5 < f2 / f < -1.9. Meeting the above range, which defines that the second lens has an appropriate negative optical power, helps balance the negative optical power of the front-end lens, reduces the generation of high-order aberrations, and facilitates the improvement of the imaging quality by the 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 < -2.1.

[0090] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 4.3 < f3 / f < 7.4. Meeting the above range, which defines that the third lens has an appropriate positive optical power, helps the light rays move smoothly and improves the imaging quality. More specifically, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 4.7 < f3 / f < 6.9.

[0091] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2.6 < f4 / f < 4.6. Meeting the above range, which defines that the fourth lens has an appropriate positive optical power, helps converge the light rays and makes as much light as possible shoot towards the image plane. More specifically, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2.8 < f4 / f < 4.2.

[0092] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.5 < f5 / f < 2.4. Meeting the above range, which defines that the fifth lens has an appropriate positive optical power, helps reduce ghost images and improve the imaging quality. More specifically, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.7 < f5 / f < 2.1.

[0093] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -2.1 < f6 / f < -1.2. Meeting the above range, which defines that the sixth lens has an appropriate negative optical power, helps increase the imaging area and improve the imaging quality. More specifically, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.9 < f6 / f < -1.4.

[0094] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.6 < f7 / f < 2.4. Satisfying the above range, defining that the seventh lens has an appropriate positive optical power, helps to optimize spherical aberration, converge marginal field light, 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: 1.8 < f7 / f < 2.1.

[0095] In some embodiments, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: f8 / f < -5. Satisfying the above range, defining that the eighth lens has an appropriate negative optical power, helps to increase the imaging area and improve the imaging quality. More specifically, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: f8 / f < -9.

[0096] 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: 1.2 < f1234 / f5678 < 2.6. Satisfying the above range, defining that the front and rear lens groups of the optical lens have a suitable focal length ratio, makes the focal length distribution of each lens of the optical lens reasonable, and improves the structural stability of the optical lens. 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: 1.5 < f1234 / f5678 < 2.4.

[0097] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 1 < R7 / R8 < 60. Satisfying the above range, reasonably defining the shapes of the object side surface and the image side surface of the fourth lens is beneficial to controlling the light trend and reducing the off-axis aberration of the optical lens. More specifically, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 3 < R7 / R8 < 53.

[0098] In some embodiments, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 0.1 < (R8 - R10) / (R8 + R10) < 0.6. Satisfying the above range, reasonably controlling the shapes of the image side surface of the fourth lens and the image side surface of the fifth lens helps to improve field curvature and aberration and improve the imaging quality. More specifically, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 0.2 < (R8 - R10) / (R8 + R10) < 0.4. <所

[0099] In some embodiments, the clear aperture radius d1 of the object side of the first lens and the clear aperture radius d8 of the image side of the fourth lens satisfy: 7.8 < d1 / d8 < 11.5; the clear aperture radius d9 of the object side of the fifth lens and the clear aperture radius d16 of the image side of the eighth lens satisfy: 0.15 < d9 / d16 < 0.4. Satisfying the above ranges and reasonably matching the aperture ratios of each lens facilitate the structural design and contribute to improving the imaging quality of the optical lens. More specifically, the clear aperture radius d1 of the object side of the first lens and the clear aperture radius d8 of the image side of the fourth lens satisfy: 8.7 < d1 / d8 < 10.1; the clear aperture radius d9 of the object side of the fifth lens and the clear aperture radius d16 of the image side of the eighth lens satisfy: 0.2 < d9 / d16 < 0.3.

[0100] In some embodiments, the distance CT12 between the first lens and the second lens on the optical axis and the distance CT23 between the second lens and the third lens on the optical axis satisfy: 0.3 < CT12 / CT23 < 1.4. Satisfying the above range reasonably controls the air gap between the first and second lenses and the air gap between the second and third lenses, maintaining good processability of the lenses and a reasonable arrangement within the optical system. More specifically, the distance CT12 between the first lens and the second lens on the optical axis and the distance CT23 between the second lens and the third lens on the optical axis satisfy: 0.4 < CT12 / CT23 < 1.1.

[0101] In some embodiments, the optical lens satisfies the conditional formula: 3mm < f < 4.3mm, FOV > 150°, 0.9mm < EPD < 1.6mm, 25mm < TTL < 34mm, 2.6 < Fno < 3.3, 13mm < IH < 18.4mm, 9° < CRA < 18°, BFL > 3mm, where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle 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, IH represents the image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray angle of incidence at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least the characteristics of a large field of view angle, a large image plane, and a relatively large back focal length.

[0102] In some embodiments, the lens material in the optical lens provided by the present invention 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 characteristic of the glass itself. The optical lens provided by the present invention can adopt an all-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0103] In some embodiments, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, in the optical lens provided by the present invention, the second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens can be aspherical lenses, and the first lens can be a spherical lens.

[0104] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations:

[0105]

[0106] 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 B, C, D, E, and F are the fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0107] 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.

[0108] Example 1

[0109] Please see Figure 1 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 1 of the present invention. The optical lens includes, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.

[0110] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0111] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0112] The third lens L3 has positive optical power, its object side S5 is concave, and its image side S6 is convex.

[0113] The fourth lens L4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex.

[0114] The fifth lens L5 has positive optical power, with its object side S9 being concave and its image side S10 being convex.

[0115] The sixth lens L6 has negative optical power, and both its object-side surface S11 and image-side surface S12 are concave.

[0116] The seventh lens L7 has positive optical power, with its object side S13 being concave and its image side S14 being convex.

[0117] The eighth lens L8 has negative optical power, with its object side S15 being convex and its image side S16 being concave.

[0118] The object-side surface S17 and the image-side surface S18 of filter G1 are both planar.

[0119] The imaging plane S19 is a plane.

[0120] 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.

[0121] The relevant parameters of each lens in the optical lens of Example 1 are shown in Table 1-1.

[0122] Table 1-1

[0123]

[0124] The surface profile parameters of the aspherical lens in Example 1 are shown in Table 1-2.

[0125] Table 1-2

[0126]

[0127]

[0128] 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 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown.

[0129] Figure 2The 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.

[0130] Figure 3 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.

[0131] Figure 4 The diagram shows the transverse chromatic aberration curves for Example 1, representing the chromatic aberration of each wavelength relative to the center wavelength (0.546 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1 μm, indicating that the optical lens can excellently correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0132] Figure 5 The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the axial aberration offset is controlled within ±0.03 mm, indicating that the optical lens can effectively correct axial aberration.

[0133] Figure 6 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of this example is above 0.38 throughout the entire field of view. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and uniformly from the center to the edge of the field of view, exhibiting good imaging quality and good detail resolution at both low and high frequencies.

[0134] Example 2

[0135] Please see Figure 7The figure shows a schematic diagram of the optical lens provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S13 of the seventh lens L7 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0136] The relevant parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0137] Table 2-1

[0138]

[0139] The surface profile parameters of the aspherical lens in Example 2 are shown in Table 2-2.

[0140] Table 2-2

[0141]

[0142]

[0143] 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 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 As shown.

[0144] from Figure 8 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens can effectively correct the field curvature.

[0145] from Figure 9 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.

[0146] from Figure 10 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.

[0147] from Figure 11 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0148] from Figure 12As 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.

[0149] Example 3

[0150] Please see Figure 13 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side surface S1 of the first lens L1 is concave; the object side surface S13 of the seventh lens L7 is convex; the object side surface S15 of the eighth lens L8 is concave; the image side surface S16 of the eighth lens L8 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0151] The relevant parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.

[0152] Table 3-1

[0153]

[0154]

[0155] The surface profile parameters of the aspherical lens in Example 3 are shown in Table 3-2.

[0156] Table 3-2

[0157] Face number K B C D E F S3 -6.34E+00 6.27E-04 -1.65E-05 9.26E-07 -1.41E-08 6.74E-11 S4 -9.45E-03 -1.23E-03 -6.71E-05 3.33E-05 -3.61E-06 1.84E-07 S5 4.10E+00 -4.68E-03 1.73E-04 2.14E-05 -1.19E-06 -2.81E-09 S6 -2.50E+01 2.02E-03 3.64E-04 -2.84E-05 5.29E-06 -3.54E-07 S7 1.22E+01 1.82E-02 -9.67E-04 1.59E-04 -1.94E-05 1.11E-06 S8 -2.06E+01 -3.13E-03 1.42E-03 -2.05E-04 3.05E-05 -9.60E-07 S9 -5.00E+01 4.57E-03 -9.20E-04 1.59E-05 -1.94E-05 2.10E-06 S10 -1.36E-01 8.66E-03 -1.18E-03 3.71E-05 -1.33E-06 -4.94E-08 S11 9.40E-01 5.86E-03 -1.59E-03 2.22E-04 -2.57E-05 1.38E-06 S12 1.74E+01 -4.61E-03 2.11E-04 -9.71E-06 5.16E-07 -1.15E-08 S13 5.03E+01 -3.13E-03 3.06E-04 -1.65E-05 4.82E-07 -6.66E-09 S14 -2.14E+00 -1.13E-03 2.35E-04 -1.70E-05 6.29E-07 -9.36E-09 S15 1.89E+00 3.94E-03 -1.78E-04 4.32E-06 -5.48E-08 2.86E-10 S16 3.86E+00 3.79E-03 -2.14E-04 6.19E-06 -9.23E-08 5.60E-10

[0158] 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 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 As shown.

[0159] from Figure 14 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.2mm to 0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0160] from Figure 15 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.

[0161] from Figure 16As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, 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.

[0162] from Figure 17 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0163] from Figure 18 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 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0164] Example 4

[0165] Please see Figure 19 The figure shows a schematic diagram of the optical lens provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side surface S13 of the seventh lens L7 is a convex surface; the object side surface S15 of the eighth lens L8 is a concave surface; the image side surface S16 of the eighth lens L8 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0166] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0167] Table 4-1

[0168]

[0169]

[0170] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0171] Table 4-2

[0172] Face number K B C D E F S3 1.41E+00 6.53E-04 -1.77E-05 9.10E-07 -1.44E-08 5.99E-11 S4 -1.91E-01 -1.10E-03 3.86E-05 3.06E-05 -3.92E-06 2.24E-07 S5 4.32E+00 -4.69E-03 1.73E-04 2.14E-05 -1.19E-06 -3.18E-09 S6 -2.60E+01 2.10E-03 3.67E-04 -2.86E-05 5.24E-06 -3.57E-07 S7 1.38E+01 1.82E-02 -9.65E-04 1.59E-04 -1.95E-05 1.07E-06 S8 -2.02E+01 -3.13E-03 1.42E-03 -2.10E-04 2.96E-05 -1.00E-06 S9 -5.00E+01 4.66E-03 -9.34E-04 8.98E-06 -1.92E-05 3.29E-06 S10 -1.39E-01 8.72E-03 -1.19E-03 3.86E-05 -1.10E-06 -4.18E-08 S11 9.50E-01 6.02E-03 -1.60E-03 2.18E-04 -2.59E-05 1.40E-06 S12 1.99E+01 -4.60E-03 2.13E-04 -9.67E-06 5.14E-07 -1.14E-08 S13 5.04E+01 -3.02E-03 3.08E-04 -1.65E-05 4.81E-07 -6.84E-09 S14 -2.27E+00 -1.32E-03 2.34E-04 -1.70E-05 6.28E-07 -9.35E-09 S15 1.90E+00 3.79E-03 -1.78E-04 4.33E-06 -5.47E-08 2.87E-10 S16 3.86E+00 3.80E-03 -2.15E-04 6.19E-06 -9.23E-08 5.61E-10

[0173] 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 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 As shown.

[0174] from Figure 20As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.15mm to 0.1mm, indicating that the optical lens can effectively correct the field curvature.

[0175] from Figure 21 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.

[0176] from Figure 22 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, 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.

[0177] from Figure 23 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens can effectively correct axial aberration.

[0178] from Figure 24 As can be seen, the MTF value of this embodiment is above 0.35 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. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0179] Example 5

[0180] Please see Figure 25 The figure shows a schematic diagram of the optical lens provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S1 of the first lens L1 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0181] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0182] Table 5-1

[0183]

[0184] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.

[0185] Table 5-2

[0186]

[0187]

[0188] 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 26 , Figure 27 , Figure 28 , Figure 29 , Figure 30 As shown.

[0189] from Figure 26 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.

[0190] from Figure 27 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.

[0191] from Figure 28 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, 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.

[0192] from Figure 29 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0193] from Figure 30 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.

[0194] Example 6

[0195] Please see Figure 31 The figure shows a schematic diagram 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 image side S12 of the sixth lens L6 is convex, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0196] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0197] Table 6-1

[0198]

[0199]

[0200] The surface profile parameters of the aspherical lens in Example 6 are shown in Table 6-2.

[0201] Table 6-2

[0202]

[0203]

[0204] 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 32 , Figure 33 , Figure 34 , Figure 35 , Figure 36 As shown.

[0205] from Figure 32 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.

[0206] from Figure 33 As can be seen, the F-θ distortion of the optical lens is controlled within 0 to 15%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0207] from Figure 34 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.

[0208] from Figure 35 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0209] from Figure 36 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.

[0210] Please refer to Table 7 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, and maximum field of view FOV, as well as the values ​​corresponding to each conditional expression in each embodiment.

[0211] Table 7

[0212]

[0213]

[0214] In summary, the optical lens provided by this invention improves imaging quality, reduces aberrations, and enhances image quality through the rational configuration of lens surface shapes and the appropriate combination of optical power. This results in the lens possessing one or more advantages such as ultra-wide angle, high pixel count, and high image quality. The optical lens of this invention can achieve underwater imaging and exhibits excellent imaging performance.

[0215] 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.

[0216] 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, characterized in that, It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, whose image side is concave; A second lens with a negative optical power, whose object side is convex and image side is concave; A third lens with a positive optical power, whose object side is concave and image side is convex; A fourth lens with a positive optical power, whose object side is concave and image side is convex; A fifth lens with a positive optical power, whose object side is concave and image side is convex; A sixth lens with a negative optical power, whose object side is concave; A seventh lens with a positive optical power, whose image side is convex; An eighth lens with a negative optical power; Wherein, the effective focal length f of the optical lens and the curvature radius R9 of the object side of the fifth lens satisfy: R9 / f < -1; The maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 50° < FOV / Fno < 65°; The maximum field angle FOV of the optical lens, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 31° < FOV × f / IH < 45°.

2. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the curvature radius R9 of the object side of the fifth lens satisfy: -7978185.02 ≤ R9 / f < -1; the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 56° < FOV / Fno < 60°; the maximum field angle FOV of the optical lens, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 36° < FOV × f / IH < 41°.

3. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.8 < BFL / f < 1.

1.

4. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the curvature radius R7 of the object side of the fourth lens satisfy: -90.45 ≤ R7 / f < -5.5; the effective focal length f of the optical lens and the curvature radius R8 of the image side of the fourth lens satisfy: -2.3 < R8 / f < -1.

2.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the curvature radius R10 of the image side of the fifth lens satisfy: -1.5 < R10 / f < -0.

5.

6. The optical lens according to claim 1, characterized in that, The curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: R9 / R10 > 1.

7. The optical lens according to claim 1, characterized in that, [[ID=!17]]The focal length f4 of the fourth lens and the curvature radius R7 of the object side of the fourth lens satisfy: -31 < R7 / f4 < -1.5; the focal length f4 of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: -0.7 < R8 / f4 < -0.

3.

8. The optical lens according to claim 1, characterized in that, The focal length f5 of the fifth lens and the curvature radius R9 of the object side of the fifth lens satisfy: R9 / f5 < -1.

9. The optical lens according to claim 1, characterized in that, The curvature radius R7 of the object side of the fourth lens and the curvature radius R9 of the object side of the fifth lens satisfy: -1 < (R7 - R9) / (R7 + R9) < 0.

10. The optical lens according to claim 1, characterized in that, The sagittal height Sag9 of the object side light-passing semi-aperture of the fifth lens satisfies: 0 < Sag9 < 0.05 mm; the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 1 < R9 / R10 ≤ 9224404.39; the focal length f5 of the fifth lens and the curvature radius R9 of the object side of the fifth lens satisfy: -4593791.27 ≤ R9 / f5 < -1.

Images