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 both an object side and an image side of the fourth lens are convex surfaces; a fifth lens with positive optical power, wherein 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; and a maximum field of view FOV of the optical lens satisfies: FOV>150°. 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 each lens surface type and reasonable matching of optical power.

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 progress of existing image processing algorithms and AI technology, optical lenses are widely used in action cameras, vehicle-mounted lenses, smart home 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 inability to adapt to dark environments, and the existing lens imaging target surface is small, which is difficult to meet 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 has eight lenses, and sequentially includes, along the optical axis from the object side to the imaging surface:

[0006] The first lens with negative focal power, the image side surface of which is a concave surface;

[0007] The second lens with negative focal power, the image side surface of which is a concave surface;

[0008] The third lens with positive focal power;

[0009] The fourth lens with positive focal power, both the object side surface and the image side surface of which are convex surfaces;

[0010] The fifth lens with positive focal power, the image side surface of which is a convex surface;

[0011] The sixth lens with negative focal power, the object side surface of which is a concave surface;

[0012] The seventh lens with positive focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface;

[0013] The eighth lens with negative focal power;

[0014] Wherein, the maximum field of view FOV of the optical lens satisfies: FOV>150°.

[0015] Further preferably, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 49°<FOV / Fno<69°.

[0016] It is further preferred that the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: BFL / f>0.75.

[0017] It is further preferred that the effective focal length f of the optical lens and the object side surface curvature radius R7 of the fourth lens satisfy: R7 / f>6.8.

[0018] It is further preferred that the effective focal length f of the optical lens and the object side surface curvature radius R13 of the seventh lens satisfy: -9.1<R13 / f<-2.2.

[0019] It is further preferred that the object side surface curvature radius R7 of the fourth lens and the image side surface curvature radius R8 of the fourth lens satisfy: R7 / R8<-3.

[0020] It is further preferred that the focal length f4 of the fourth lens and the object side surface curvature radius R7 of the fourth lens satisfy: 2.2<R7 / f4<40; the focal length f4 of the fourth lens and the image side surface curvature radius R8 of the fourth lens satisfy: -0.9<R8 / f4<-0.4.

[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: R13 / f7<-0.5; the focal length f7 of the seventh lens and the image side surface curvature radius R14 of the seventh lens satisfy: -0.6<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<(R13-R14) / (R13+R14)<1.

[0023] It is further preferred that the object side surface half diameter of light d13 of the seventh lens and the object side surface sag Sag13 of the seventh lens satisfy: Sag13 / d13<-0.01.

[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 be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0026] Figure 1 The structure of the optical lens in the embodiment 1 of the present application is shown in the figure.

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

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

[0029] Figure 4 Vignetting curve of the optical lens in Embodiment 1 of the present application.

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

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

[0032] Figure 7 Structure diagram of the optical lens in Embodiment 2 of the present application.

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

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

[0035] Figure 10 Vignetting curve of the optical lens in Embodiment 2 of the present application.

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

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

[0038] Figure 13 Structure diagram of the optical lens in Embodiment 3 of the present application.

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

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

[0041] Figure 16 Vignetting curve of the optical lens in Embodiment 3 of the present application.

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

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

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

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

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

[0047] Figure 22 The axial chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

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

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

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

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

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

[0053] Figure 28 The axial chromatic aberration curve of the optical lens in Embodiment 5 of the present application.

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

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

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

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

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

[0059] Figure 34 The axial chromatic aberration 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-θ distortion curve of the optical lens in Embodiment 7 of the present application.

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

[0066] Figure 41 MTF 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-θ distortion curve of the optical lens in Embodiment 8 of the present application.

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

[0072] Figure 47 MTF 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 49 Structure diagram of the optical lens in Embodiment 9 of the present application.

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

[0076] Figure 51This is the F-θ distortion curve of the optical lens in Embodiment 9 of the present invention.

[0077] Figure 52 This is a chromatic aberration curve of the optical lens in Embodiment 9 of the present invention.

[0078] Figure 53 This is an axial aberration curve of the optical lens in Embodiment 9 of the present invention.

[0079] Figure 54 This is the MTF curve of the optical lens in Embodiment 9 of the present invention.

[0080] Figure 55 This is a schematic diagram of the optical lens structure in Embodiment 10 of the present invention.

[0081] Figure 56 This is a field curvature curve diagram of the optical lens in Embodiment 10 of the present invention.

[0082] Figure 57 This is the F-θ distortion curve of the optical lens in Embodiment 10 of the present invention.

[0083] Figure 58 This is a chromatic aberration curve of the optical lens in Embodiment 10 of the present invention.

[0084] Figure 59 This is an axial aberration curve of the optical lens in Embodiment 10 of the present invention.

[0085] Figure 60 This is the MTF curve of the optical lens in Embodiment 10 of the present invention.

[0086] Figure 61 This is a schematic diagram of the optical lens structure in Embodiment 11 of the present invention.

[0087] Figure 62 This is a field curvature curve diagram of the optical lens in Embodiment 11 of the present invention.

[0088] Figure 63 This is the F-θ distortion curve of the optical lens in Embodiment 11 of the present invention.

[0089] Figure 64 This is a chromatic aberration curve of the optical lens in Embodiment 11 of the present invention.

[0090] Figure 65 This is an axial aberration curve of the optical lens in Embodiment 11 of the present invention.

[0091] Figure 66 This is the MTF curve of the optical lens in Embodiment 11 of the present invention.

[0092] Figure 67 This is a schematic diagram of the optical lens structure in Embodiment 12 of the present invention.

[0093] Figure 68 This is a field curvature curve diagram of the optical lens in Embodiment 12 of the present invention.

[0094] Figure 69 This is the F-θ distortion curve of the optical lens in Embodiment 12 of the present invention.

[0095] Figure 70 This is a chromatic aberration curve of the optical lens in Embodiment 12 of the present invention.

[0096] Figure 71 This is an axial aberration curve of the optical lens in Embodiment 12 of the present invention.

[0097] Figure 72 This is the MTF curve of the optical lens in Embodiment 12 of the present invention.

[0098] Figure 73 This is a schematic diagram of the optical lens structure in Embodiment 13 of the present invention.

[0099] Figure 74 This is a field curvature curve diagram of the optical lens in Embodiment 13 of the present invention.

[0100] Figure 75 This is the F-θ distortion curve of the optical lens in Embodiment 13 of the present invention.

[0101] Figure 76 This is a chromatic aberration curve of the optical lens in Embodiment 13 of the present invention.

[0102] Figure 77 This is an axial aberration curve of the optical lens in Embodiment 13 of the present invention.

[0103] Figure 78 This is the MTF curve of the optical lens in Embodiment 13 of the present invention.

[0104] Figure 79 This is a schematic diagram of the optical lens structure in Embodiment 14 of the present invention.

[0105] Figure 80 This is a field curvature curve diagram of the optical lens in Embodiment 14 of the present invention.

[0106] Figure 81 This is the F-θ distortion curve of the optical lens in Embodiment 14 of the present invention.

[0107] Figure 82 This is a chromatic aberration curve of the optical lens in Embodiment 14 of the present invention.

[0108] Figure 83 This is an axial aberration curve of the optical lens in Embodiment 14 of the present invention.

[0109] Figure 84 This is the MTF curve of the optical lens in Embodiment 14 of the present invention.

[0110] Figure 85 This is a schematic diagram of the optical lens structure in Embodiment 15 of the present invention.

[0111] Figure 86 This is a field curvature curve diagram of the optical lens in Embodiment 15 of the present invention.

[0112] Figure 87 This is the F-θ distortion curve of the optical lens in Embodiment 15 of the present invention.

[0113] Figure 88 This is a chromatic aberration curve of the optical lens in Embodiment 15 of the present invention.

[0114] Figure 89 This is an axial aberration curve of the optical lens in Embodiment 15 of the present invention.

[0115] Figure 90 This is the MTF curve of the optical lens in Embodiment 15 of the present invention.

[0116] Figure 91 This is a schematic diagram of the optical lens structure in Embodiment 16 of the present invention.

[0117] Figure 92 This is a field curvature curve diagram of the optical lens in Embodiment 16 of the present invention.

[0118] Figure 93 This is the F-θ distortion curve of the optical lens in Embodiment 16 of the present invention.

[0119] Figure 94 This is a chromatic aberration curve of the optical lens in Embodiment 16 of the present invention.

[0120] Figure 95 This is an axial aberration curve of the optical lens in Embodiment 16 of the present invention.

[0121] Figure 96 This is the MTF curve of the optical lens in Embodiment 16 of the present invention.

[0122] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] In some embodiments, the first lens may have negative optical power, and its object-side surface may be flat, concave, or convex, while its image-side surface is concave. The second lens may have negative optical power, and its object-side surface may be concave or convex, while its image-side surface is concave. The third lens may have positive optical power, and its object-side surface may be concave or convex, while its image-side surface may be concave or convex. The fourth lens may have positive optical power, and both its object-side and image-side surfaces are convex. The fifth lens may have positive optical power, and its object-side surface may be concave or convex, while its image-side surface is convex. The sixth lens may have negative optical power, and its object-side surface may be concave, while its image-side surface may be concave or convex. The seventh lens may have positive optical power, and its object-side surface may be concave, while its image-side surface is convex. The eighth lens may have negative optical power, and its object-side surface may be concave or convex, while its image-side surface may be concave or convex. The optical lens of the present invention can achieve underwater imaging and has good imaging performance.

[0132] In some embodiments, the optical lens may also include an aperture stop, which may be located between the fourth and fifth lenses. It is understood that the aperture stop is used to limit the amount of light entering the lens, thereby changing the brightness of the image. Furthermore, when the aperture stop is located between the fourth and fifth lenses, it can rationally allocate the functions of the first to eighth lenses. For example, the first, second, third, and fourth lenses can be used to receive light to a greater extent, while the fifth to eighth lenses can be used to correct aberrations, which is beneficial for balancing the overall structure of the optical system. In addition, when the aperture stop is located between the fourth and fifth lenses, it facilitates the correction of aperture aberrations.

[0133] In some embodiments, the optical lens may further include a filter disposed between the eighth lens and the imaging surface. The filter is used to filter out interfering light and prevent it from reaching the imaging surface of the optical lens and affecting normal imaging.

[0134] In some implementations, the maximum field of view (FOV) of the optical lens satisfies: FOV > 150°. Meeting this range enables the optical lens to achieve a large field of view. More specifically, the maximum field of view (FOV) of the optical lens satisfies: FOV > 160°.

[0135] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 49° < FOV / Fno < 69°. Meeting the above range defines that the optical lens has an appropriate field of view and aperture value, 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: 55° < FOV / Fno < 62°.

[0136] 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 > 0.75. Meeting the above range defines that the optical lens has an appropriate back focus, which is convenient for reasonably arranging the positions of each lens and 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: 0.75 < BFL / f < 1.2.

[0137] 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 > 6.8. Meeting the above range reasonably defines the shape of the object side surface of the fourth lens, which helps to reduce astigmatism and improve imaging quality. 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: 7 < R7 / f < 110.

[0138] In some embodiments, the effective focal length f of the optical lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: -9.1 < R13 / f < -2.2. Meeting the above range reasonably defines the shape of the object side surface of the seventh lens, which helps to reasonably control the light trend, reduce field curvature, and improve the imaging quality of the optical lens. More specifically, the effective focal length f of the optical lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: -8.2 < R13 / f < -2.7.

[0139] 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: R7 / R8 < -3. Meeting the above range reasonably defines the shapes of the object side surface and the image side surface of the fourth lens, which helps to balance aberrations such as astigmatism and distortion of the optical lens, making the optical lens have good imaging quality. 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: -62 < R7 / R8 < -3.

[0140] In some embodiments, the focal length f4 of the fourth lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: 2.2 < R7 / f4 < 40; the focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -0.9 < R8 / f4 < -0.4. Satisfying the above ranges and reasonably controlling the ratios of the curvature radii 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 curvature radius R7 of the object side surface of the fourth lens satisfy: 2.6 < R7 / f4 < 36.2; the focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -0.8 < R8 / f4 < -0.5.

[0141] In some embodiments, the focal length f7 of the seventh lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: R13 / f7 < -0.5; the focal length f7 of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: -0.6 < R14 / f7 < -0.2. Satisfying the above ranges and reasonably controlling the ratios of the curvature radii of the object side surface and the image side surface of the seventh lens to the focal length of the seventh lens respectively helps to reduce distortion and improve imaging quality. More specifically, the focal length f7 of the seventh lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: R13 / f7 < -1.1; the focal length f7 of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: -0.5 < R14 / f7 < -0.3.

[0142] In some embodiments, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 0 < (R13 - R14) / (R13 + R14) < 1. Satisfying the above range and reasonably defining the shapes of the object side surface and the image side surface of the seventh lens can control the seventh lens to have an appropriate surface shape, effectively improve field curvature and aberrations, and improve imaging quality. More specifically, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 0.5 < (R13 - R14) / (R13 + R14) < 0.85.

[0143] In some embodiments, the clear aperture semi-diameter d13 of the object side surface of the seventh lens and the sagittal height Sag13 of the clear aperture of the object side surface of the seventh lens satisfy: Sag13 / d13 < -0.01. Satisfying the above range and controlling the relationship between the sagittal height and the clear aperture semi-diameter of the object side surface of the seventh lens helps to reduce the aberrations of marginal field rays and improve imaging quality. More specifically, the clear aperture semi-diameter d13 of the object side surface of the seventh lens and the sagittal height Sag13 of the clear aperture of the object side surface of the seventh lens satisfy: -0.2 < Sag13 / d13 < -0.05.

[0144] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL satisfy: 6.2 < TTL / f < 9.6. Satisfying the above range and reasonably controlling the relationship between the total 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 total optical length TTL satisfy: 6.9 < TTL / f < 8.7.

[0145] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle satisfy: 3 < IH / f < 4.9. Satisfying 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 angle satisfy: 3.4 < IH / f < 4.5.

[0146] In some embodiments, 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: 33° < FOV × f / IH < 55°. Satisfying the above range and limiting the field angle, focal length, and image height of the optical lens within a reasonable range helps to balance the large field angle and the large image plane and improve the overall structural stability of the lens. More specifically, 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: 38° < FOV × f / IH < 49°.

[0147] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -5.6 < f1 / f < -3.2. Satisfying the above range and limiting the first lens to have an appropriate negative optical power helps the optical lens to collect light at large angles and achieve the large field angle characteristic. More specifically, 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.

[0148] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -2.7 < f2 / f < -1.2. Satisfying the above range and limiting the second lens to have an appropriate negative optical power helps to balance the negative optical power of the front lens, reduce the generation of high-order aberrations, and facilitate the improvement of the 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: -2.5 < f2 / f < -1.8.

[0149] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 6.2 < f3 / f < 19.5. Meeting the above range and defining that the third lens has an appropriate positive optical power helps to keep the light path stable 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: 6.9 < f3 / f <  17.3.

[0150] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2.1 < f4 / f < 3.6. Meeting the above range and defining that the fourth lens has an appropriate positive optical power helps to converge light rays and make as many light rays 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: 2.5 < f4 / f < 3.3.

[0151] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.4 < f5 / f < 2.1. Meeting the above range and defining that the fifth lens has an appropriate positive optical power helps to 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: 1.6 < f5 / f < 1.9.

[0152] 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 < -1.1. Meeting the above range and defining that the sixth lens has an appropriate negative optical power helps to 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.

[0153] 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 < 2.9. Meeting the above range and defining that the seventh lens has an appropriate positive optical power helps to optimize spherical aberration, converge marginal field light rays, 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 < 2.6.

[0154] In some embodiments, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: -32 < f8 / f < -7.5. Meeting the above range and 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: -29.1 < f8 / f < -8.7.

[0155] 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 < 3.5. Meeting the above range defines a suitable focal length ratio between the front and rear lens groups of the optical lens, enables a reasonable distribution of the focal lengths of the lenses of the optical lens, 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 < 3.1.

[0156] In some embodiments, the effective focal length f of the optical lens and the image-side curvature radius R8 of the fourth lens satisfy: -2.7 < R8 / f < -1.2. Meeting the above range reasonably defines the shape of the image side of the fourth lens, which helps to optimize the field curvature and improve the imaging quality. More specifically, the effective focal length f of the optical lens and the image-side curvature radius R8 of the fourth lens satisfy: -2.4 < R8 / f < -1.6.

[0157] In some embodiments, the effective focal length f of the optical lens and the image-side curvature radius R14 of the seventh lens satisfy: -1.2 < R14 / f < -0.6. Meeting the above range defines the shape of the image side of the seventh lens, which helps to control astigmatism and achieve the high-pixel characteristics of the optical lens. More specifically, the effective focal length f of the optical lens and the image-side curvature radius R14 of the seventh lens satisfy: -1 < R14 / f < -0.8.

[0158] In some embodiments, the object-side curvature radius R13 of the seventh lens and the image-side curvature radius R14 of the seventh lens satisfy: 2.5 < R13 / R14 < 12. Meeting the above range reasonably defines the shapes of the object side and the image side of the seventh lens, which helps to control the light path, reduce off-axis aberration, and improve the imaging quality of the optical lens. More specifically, the object-side curvature radius R13 of the seventh lens and the image-side curvature radius R14 of the seventh lens satisfy: 3.1 < R13 / R14 < 9.6.

[0159] In some embodiments, the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: (R7 - R8) / (R7 + R8) > 1. Meeting the above range reasonably defines the shapes of the object side and the image side of the fourth lens, which can control the fourth lens to have an appropriate surface shape, reduce the generation of higher-order aberrations, and at the same time reduce the difficulty of distortion correction of subsequent lenses. More specifically, the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: 1 < (R7 - R8) / (R7 + R8) < 1.8.

[0160] In some embodiments, the clear aperture semi-diameter d8 of the image side surface of the fourth lens and the sagittal height Sag8 of the clear aperture of the image side surface of the fourth lens satisfy: Sag8 / d8 < -0.01. Meeting the above range and controlling the relationship between the sagittal height and the clear aperture semi-diameter of the image side surface of the fourth lens helps to control the light path, reduce ghost images, and reduce the generation of higher-order aberrations. More specifically, the clear aperture semi-diameter d8 of the image side surface of the fourth lens and the sagittal height Sag8 of the clear aperture of the image side surface of the fourth lens satisfy: -0.2 < Sag8 / d8 < -0.05.

[0161] In some embodiments, the clear aperture semi-diameter d1 of the object side surface of the first lens and the clear aperture semi-diameter d8 of the image side surface of the fourth lens satisfy: 7.5 < d1 / d8 < 12; the clear aperture semi-diameter d9 of the object side surface of the fifth lens and the clear aperture semi-diameter d16 of the image side surface of the eighth lens satisfy: 0.1 < d9 / d16 < 0.5. Meeting the above range and reasonably matching the aperture ratios of each lens facilitate the structural design and at the same time help to improve the imaging quality of the optical lens. More specifically, the clear aperture semi-diameter d1 of the object side surface of the first lens and the clear aperture semi-diameter d8 of the image side surface of the fourth lens satisfy: 8.2 < d1 / d8 < 10.2; the clear aperture semi-diameter d9 of the object side surface of the fifth lens and the clear aperture semi-diameter d16 of the image side surface of the eighth lens satisfy: 0.2 < d9 / d16 < 0.45.

[0162] In some embodiments, the spacing CT12 between the first lens and the second lens on the optical axis and the spacing CT23 between the second lens and the third lens on the optical axis satisfy: 0.3 < CT12 / CT23 < 1.6. Meeting the above range and reasonably controlling the air gap between the first and second lenses and the air gap between the second and third lenses maintain good processability of the lenses and a reasonable arrangement within the optical system. More specifically, the spacing CT12 between the first lens and the second lens on the optical axis and the spacing CT23 between the second lens and the third lens on the optical axis satisfy: 0.4 < CT12 / CT23 < 1.5.

[0163] In some embodiments, the optical lens satisfies the conditional formula: 3.2 mm < f < 4.8 mm, 1 mm < EPD < 1.8 mm, 25 mm < TTL < 34 mm, 2.5 < Fno < 3.3, 10 mm < IH < 18.4 mm, 10° < CRA < 26°, BFL > 3 mm, where f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the f-number of the optical lens, IH represents the image height corresponding to the maximum field angle of the optical lens, CRA represents the principal ray incident angle at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least the characteristics of a large image plane and a relatively large back focal length, etc.

[0164] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens is made of plastic, production costs can be effectively reduced. Conversely, when the lens is made of glass, the low dispersion characteristic of glass itself can effectively correct geometric chromatic aberration of the optical system. The optical lens provided by the present invention can employ an all-glass lens structure, which can reduce dispersion, effectively correct chromatic aberration of the optical lens, and improve image quality.

[0165] 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.

[0166] 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:

[0167]

[0168] 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.

[0169] 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.

[0170] Example 1

[0171] 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.

[0172] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0173] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0174] The third lens L3 has positive optical power, its object side S5 is concave, and its image side S6 is convex.

[0175] The fourth lens L4 has positive optical power, and both its object-side surface S7 and image-side surface S8 are convex.

[0176] The fifth lens L5 has positive optical power, with its object side S9 being concave and its image side S10 being convex.

[0177] The sixth lens L6 has negative optical power, and both its object-side surface S11 and image-side surface S12 are concave.

[0178] The seventh lens L7 has positive optical power, with its object side S13 being concave and its image side S14 being convex.

[0179] The eighth lens L8 has negative optical power, with its object side S15 being convex and its image side S16 being concave.

[0180] The object-side surface S17 and the image-side surface S18 of filter G1 are both planar.

[0181] The imaging plane S19 is a plane.

[0182] 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.

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

[0184] Table 1-1

[0185]

[0186]

[0187] The surface profile parameters of the aspherical lens in Example 1 are shown in Table 1-2.

[0188] Table 1-2

[0189] 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

[0190] 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.

[0191] 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.

[0192] 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.

[0193] Figure 5 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.

[0194] Figure 6 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.

[0195] Figure 7The 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 0.4 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.

[0196] Example 2

[0197] Please see Figure 8 The 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 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.

[0198] The relevant parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0199] Table 2-1

[0200]

[0201]

[0202] The surface profile parameters of the aspherical lens in Example 2 are shown in Table 2-2.

[0203] Table 2-2

[0204] 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

[0205] 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 10 , Figure 11 , Figure 12 , Figure 8 , Figure 9 As shown.

[0206] from Figure 10 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.1mm to 0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0207] from Figure 11 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.

[0208] from Figure 12As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens can effectively correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0209] from Figure 13 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0210] from Figure 14 As can be seen, the MTF value of this embodiment is above 0.45 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.

[0211] Example 3

[0212] Please see Figure 15 The figure shows a schematic diagram 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 S9 of the fifth lens L5 is convex; the image side surface 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.

[0213] The relevant parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.

[0214] Table 3-1

[0215]

[0216]

[0217] The surface profile parameters of the aspherical lens in Example 3 are shown in Table 3-2.

[0218] Table 3-2

[0219] Figure 16 K B C D E F S3 1.20E+01 6.20E-04 -1.71E-05 7.30E-07 -1.29E-08 1.13E-10 S4 -4.76E-01 1.37E-03 -6.24E-05 3.34E-05 -3.35E-06 1.68E-07 S5 -4.09E-02 -4.32E-03 1.50E-04 1.87E-05 -1.07E-06 4.25E-09 S6 -4.41E+01 2.31E-03 3.73E-04 -3.22E-05 5.17E-06 -3.39E-07 S7 -1.66E+01 1.72E-02 -9.74E-04 1.55E-04 -1.80E-05 9.75E-07 S8 -2.23E+01 -2.18E-03 1.41E-03 -2.21E-04 3.76E-05 -1.80E-06 S9 4.98E+01 4.74E-03 -9.39E-04 5.18E-05 -5.47E-06 -3.25E-07 S10 1.38E-02 9.10E-03 -1.07E-03 4.46E-05 -5.58E-07 3.85E-09 S11 7.82E-01 4.74E-03 -1.71E-03 2.32E-04 -2.52E-05 1.38E-06 S12 1.38E+00 -4.66E-03 2.14E-04 -9.53E-06 5.39E-07 -1.02E-08 S13 -1.64E+01 -2.59E-03 3.02E-04 -1.62E-05 4.99E-07 -6.67E-09 S14 -1.01E+00 -1.29E-03 2.36E-04 -1.68E-05 6.54E-07 -8.87E-09 S15 2.23E+00 -4.08E-03 2.12E-04 -6.17E-06 9.39E-08 -5.72E-10 S16 2.01E+00 -4.05E-03 1.72E-04 -4.34E-06 5.49E-08 -2.87E-10

[0220] 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 17 , Figure 18 , Figure 14 , Figure 15 , Figure 16 As shown.

[0221] from Figure 17 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.

[0222] from Figure 18 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.

[0223] from Figure 19 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.

[0224] from Figure 20 As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens can effectively correct axial aberration.

[0225] from Figure 21 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.

[0226] Example 4

[0227] Please see Figure 22 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 S9 of the fifth lens L5 is a convex surface; the image side S12 of the sixth lens L6 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0228] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0229] Table 4-1

[0230]

[0231] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0232] Table 4-2

[0233]

[0234]

[0235] 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 23 , Figure 24 , Figure 20 ,Figure 21 , Figure 22 As shown.

[0236] from Figure 23 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.06mm, indicating that the optical lens can effectively correct field curvature.

[0237] from Figure 24 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.

[0238] from Figure 25 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.

[0239] from Figure 26 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens can effectively correct axial aberration.

[0240] from Figure 27 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.

[0241] Example 5

[0242] Please see Figure 28 The figure shows a schematic diagram of the structure 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 a plane; the object side surface S9 of the fifth lens L5 is a convex surface; the image side surface S12 of the sixth lens L6 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0243] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0244] Table 5-1

[0245]

[0246]

[0247] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.

[0248] Table 5-2

[0249] Figure 29 K B C D E F S3 4.42E+00 7.23E-04 -1.90E-05 6.91E-07 -1.23E-08 9.89E-11 S4 -5.39E-02 1.41E-03 -2.05E-05 2.97E-05 -2.81E-06 1.34E-07 S5 -1.29E+01 -4.21E-03 1.29E-04 1.66E-05 -1.03E-06 9.40E-09 S6 -4.83E+01 2.17E-03 3.67E-04 -2.91E-05 5.24E-06 -3.42E-07 S7 5.02E+01 1.74E-02 -9.27E-04 1.53E-04 -1.82E-05 9.09E-07 S8 -2.21E+01 -2.05E-03 1.48E-03 -2.50E-04 3.89E-05 -6.87E-07 S9 -5.00E+01 4.07E-03 -8.24E-04 6.29E-05 -1.06E-05 -8.44E-07 S10 -4.44E-04 8.91E-03 -1.08E-03 4.53E-05 -1.15E-06 8.03E-09 S11 7.92E-01 4.83E-03 -1.68E-03 2.29E-04 -2.58E-05 1.32E-06 S12 1.14E+00 -4.53E-03 2.09E-04 -9.72E-06 5.68E-07 -7.81E-09 S13 -2.05E+01 -2.04E-03 3.03E-04 -1.66E-05 4.80E-07 -6.70E-09 S14 -1.07E+00 -1.38E-03 2.46E-04 -1.69E-05 6.38E-07 -9.33E-09 S15 5.81E+00 -3.99E-03 2.13E-04 -6.22E-06 9.29E-08 -5.76E-10 S16 1.67E+00 -3.86E-03 1.73E-04 -4.35E-06 5.46E-08 -2.83E-10

[0250] 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 30 , Figure 26 , Figure 27 , Figure 28 , Figure 29 As shown.

[0251] from Figure 30 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.

[0252] from Figure 31 As can be seen, the F-θ distortion of the optical lens is controlled within ±10%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0253] from Figure 32 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens can effectively correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0254] from Figure 33 As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens can effectively correct axial aberration.

[0255] from Figure 34 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.

[0256] Example 6

[0257] Please see Figure 35 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 S9 of the fifth lens L5 is a convex surface; the image side S12 of the sixth lens L6 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0258] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0259] Table 6-1

[0260]

[0261]

[0262] The surface profile parameters of the aspherical lens in Example 6 are shown in Table 6-2.

[0263] Table 6-2

[0264] Figure 36 K B C D E F S3 6.20E+00 7.63E-04 -2.20E-05 7.39E-07 -1.14E-08 7.70E-11 S4 -2.69E-01 1.65E-03 -4.80E-06 2.52E-05 -2.81E-06 1.46E-07 S5 3.27E-01 -4.26E-03 1.42E-04 1.82E-05 -1.06E-06 4.30E-09 S6 -3.78E+01 2.09E-03 3.91E-04 -3.04E-05 5.13E-06 -3.44E-07 S7 -5.00E+01 1.74E-02 -9.81E-04 1.53E-04 -1.79E-05 9.62E-07 S8 -2.03E+01 -2.27E-03 1.42E-03 -2.25E-04 3.59E-05 -1.12E-06 S9 -5.00E+01 4.82E-03 -8.38E-04 4.44E-05 -7.11E-06 -5.16E-07 S10 2.58E-02 9.25E-03 -1.10E-03 4.81E-05 -8.67E-07 -3.22E-08 S11 7.51E-01 4.87E-03 -1.67E-03 2.25E-04 -2.54E-05 1.41E-06 S12 -3.41E+00 -4.16E-03 2.18E-04 -9.45E-06 5.36E-07 -1.07E-08 S13 -5.08E+01 -2.20E-03 3.02E-04 -1.65E-05 4.88E-07 -6.65E-09 S14 -1.04E+00 -1.21E-03 2.36E-04 -1.70E-05 6.48E-07 -9.08E-09 S15 4.84E+00 -4.02E-03 2.09E-04 -6.22E-06 9.36E-08 -5.65E-10 S16 2.01E+00 -4.18E-03 1.73E-04 -4.33E-06 5.46E-08 -2.93E-10

[0265] 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.

[0266] from Figure 37 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0267] from Figure 38 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.

[0268] from Figure 39 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.

[0269] from Figure 40 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens can effectively correct axial aberration.

[0270] from Figure 41 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.

[0271] Example 7

[0272] Please see Figure 42 The figure shows a schematic diagram of the optical lens provided in Embodiment 7 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 a plane; the object side surface S9 of the fifth lens L5 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0273] The relevant parameters of each lens in the optical lens of Example 7 are shown in Table 7-1.

[0274] Table 7-1

[0275]

[0276] The surface profile parameters of the aspherical lens in Example 7 are shown in Table 7-2.

[0277] Table 7-2

[0278] Figure 38 K B C D E F S3 3.77E+00 5.86E-04 -1.80E-05 7.28E-07 -1.29E-08 9.78E-11 S4 -4.12E-01 1.31E-03 -5.43E-05 3.09E-05 -3.02E-06 1.41E-07 S5 -6.59E+00 -4.26E-03 1.41E-04 1.74E-05 -1.08E-06 1.14E-08 S6 -4.90E+01 2.28E-03 3.68E-04 -3.20E-05 5.31E-06 -3.08E-07 S7 -5.00E+01 1.68E-02 -9.88E-04 1.58E-04 -1.80E-05 9.32E-07 S8 -2.20E+01 -2.55E-03 1.36E-03 -2.27E-04 3.61E-05 -1.52E-06 S9 -5.00E+01 4.50E-03 -8.29E-04 5.48E-05 -7.85E-06 -5.91E-07 S10 -3.08E-02 9.41E-03 -1.03E-03 4.60E-05 -1.40E-06 -3.46E-08 S11 7.86E-01 4.32E-03 -1.70E-03 2.29E-04 -2.56E-05 1.33E-06 S12 2.48E+01 -4.83E-03 2.09E-04 -9.70E-06 5.61E-07 -8.56E-09 S13 -3.10E+01 -2.24E-03 3.02E-04 -1.65E-05 4.84E-07 -6.74E-09 S14 -1.02E+00 -1.50E-03 2.45E-04 -1.68E-05 6.42E-07 -9.20E-09 S15 5.50E+00 -3.91E-03 2.12E-04 -6.22E-06 9.30E-08 -5.75E-10 S16 1.75E+00 -3.93E-03 1.74E-04 -4.34E-06 5.46E-08 -2.86E-10

[0279] 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 39 , Figure 40 , Figure 41 , Figure 42 , Figure 43 As shown.

[0280] from Figure 44 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.

[0281] from Figure 45 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.

[0282] from Figure 46 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.

[0283] from Figure 47 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens can effectively correct axial aberration.

[0284] from Figure 48 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.

[0285] Example 8

[0286] Please see Figure 44The figure shows a schematic diagram of the optical lens provided in Embodiment 8 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S9 of the fifth lens L5 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0287] The relevant parameters of each lens in the optical lens of Example 8 are shown in Table 8-1.

[0288] Table 8-1

[0289]

[0290] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0291] Table 4-2

[0292]

[0293]

[0294] 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 45 , Figure 46 , Figure 47 , Figure 48 , Figure 49 As shown.

[0295] from Figure 50 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.06mm, indicating that the optical lens can effectively correct field curvature.

[0296] from Figure 51 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.

[0297] from Figure 52 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.

[0298] from Figure 53 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens can effectively correct axial aberration.

[0299] from Figure 54As 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.

[0300] Example 9

[0301] Please see Figure 50 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 S9 of the fifth lens L5 is a convex surface; the object side surface S15 of the eighth lens L8 is a concave surface; and the image side surface S16 of the eighth lens L8 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0302] The relevant parameters of each lens in the optical lens of Example 9 are shown in Table 9-1.

[0303] Table 9-1

[0304]

[0305]

[0306] The surface profile parameters of the aspherical lens in the optical lens of Example 9 are shown in Table 9-2.

[0307] Table 9-2

[0308] Figure 51 K B C D E F S3 4.65E+01 1.13E-03 -2.47E-05 5.02E-07 -8.48E-09 4.61E-11 S4 -1.85E+00 2.92E-03 1.38E-04 -1.38E-05 1.49E-06 -6.49E-08 S5 -7.95E+00 -4.49E-03 1.82E-04 1.71E-05 -1.31E-06 1.69E-08 S6 -5.30E+01 1.44E-03 2.32E-04 -2.09E-05 3.96E-06 -2.54E-07 S7 -5.01E+01 1.57E-02 -1.07E-03 1.21E-04 -9.23E-06 3.86E-07 S8 -3.17E+01 -1.27E-03 1.29E-03 -1.79E-04 2.52E-05 -4.57E-07 S9 -4.81E+01 6.29E-03 -5.57E-04 3.70E-05 -2.50E-06 5.96E-08 S10 -3.50E-01 1.12E-02 -1.18E-03 4.72E-05 -3.36E-06 1.87E-07 S11 8.15E-01 5.35E-03 -1.44E-03 1.92E-04 -2.31E-05 1.24E-06 S12 5.00E+01 -4.20E-03 2.72E-04 -1.48E-05 3.12E-07 8.70E-09 S13 -1.03E+01 -1.37E-05 2.21E-04 -2.03E-05 5.77E-07 -3.48E-09 S14 -2.76E+00 -3.36E-03 2.37E-04 -1.54E-05 6.90E-07 -1.10E-08 S15 2.32E+00 1.64E-03 -1.94E-04 5.31E-06 -5.28E-08 1.68E-10 S16 4.30E+00 1.73E-03 -1.83E-04 5.86E-06 -8.97E-08 5.41E-10

[0309] 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 52 , Figure 53 , Figure 54 , Figure 55 , Figure 56 As shown.

[0310] from Figure 57 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0311] from Figure 58 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.

[0312] from Figure 59As 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.

[0313] from Figure 60 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0314] from Figure 56 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.

[0315] Example 10

[0316] Please see Figure 57 The diagram shows a schematic of the optical lens provided in Embodiment 10 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 a plane; the object-side surface R3 of the second lens L2 is a concave surface; the object-side surface S9 of the fifth lens L5 is a convex surface; the object-side surface S15 of the eighth lens L8 is a concave surface; and the image-side surface S16 of the eighth lens L8 is a convex surface. The optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0317] The relevant parameters of each lens in the optical lens of Example 10 are shown in Table 10-1.

[0318] Table 10-1

[0319]

[0320]

[0321] The surface profile parameters of the aspherical lens in the optical lens of Example 10 are shown in Table 10-2.

[0322] Table 10-2

[0323] Figure 58 K B C D E F S3 -4.76E+01 1.13E-03 -2.48E-05 5.03E-07 -8.44E-09 4.91E-11 S4 -1.97E+00 2.91E-03 1.39E-04 -1.39E-05 1.49E-06 -6.54E-08 S5 -7.81E+00 -4.49E-03 1.83E-04 1.72E-05 -1.31E-06 1.66E-08 S6 -5.33E+01 1.46E-03 2.32E-04 -2.10E-05 3.98E-06 -2.53E-07 S7 -5.35E+01 1.57E-02 -1.07E-03 1.22E-04 -9.20E-06 3.87E-07 S8 -3.19E+01 -1.26E-03 1.30E-03 -1.79E-04 2.52E-05 -4.29E-07 S9 -4.84E+01 6.33E-03 -5.53E-04 3.72E-05 -2.50E-06 6.19E-08 S10 -3.52E-01 1.12E-02 -1.17E-03 4.73E-05 -3.34E-06 1.88E-07 S11 8.13E-01 5.37E-03 -1.44E-03 1.92E-04 -2.31E-05 1.24E-06 S12 5.03E+01 -4.20E-03 2.73E-04 -1.48E-05 3.14E-07 8.70E-09 S13 -1.02E+01 -1.08E-05 2.23E-04 -2.03E-05 5.78E-07 -3.40E-09 S14 -2.75E+00 -3.37E-03 2.39E-04 -1.54E-05 6.90E-07 -1.10E-08 S15 2.30E+00 1.66E-03 -1.94E-04 5.32E-06 -5.29E-08 1.65E-10 S16 4.62E+00 1.72E-03 -1.84E-04 5.86E-06 -8.95E-08 5.44E-10

[0324] 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 59 , Figure 60 , Figure 61 , Figure 62 , Figure 63 As shown.

[0325] from Figure 64As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0326] from Figure 65 As can be seen, the F-θ distortion of the optical lens is controlled within ±10%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0327] from Figure 66 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.

[0328] from Figure 62 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0329] from Figure 63 As can be seen, the MTF value of this embodiment is above 0.45 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.

[0330] Example 11

[0331] Please see Figure 64 The diagram shows a schematic of the optical lens provided in Embodiment 11 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 R3 of the second lens L2 is concave; the object-side surface S9 of the fifth lens L5 is convex; the object-side surface S15 of the eighth lens L8 is concave; and the image-side surface S16 of the eighth lens L8 is convex. The optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0332] The relevant parameters of each lens in the optical lens of Example 11 are shown in Table 11-1.

[0333] Table 11-1

[0334]

[0335] The surface profile parameters of the aspherical lens in the optical lens of Example 11 are shown in Table 11-2.

[0336] Table 11-2

[0337]

[0338]

[0339] 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 65 , Figure 66 , Figure 67 , Figure 68 , Figure 69 As shown.

[0340] from Figure 70 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.

[0341] from Figure 71 As can be seen, the F-θ distortion of the optical lens is controlled within ±10%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0342] from Figure 72 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.

[0343] from Figure 68 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens can effectively correct axial aberration.

[0344] from Figure 69 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.

[0345] Example 12

[0346] Please see Figure 70 The figure shows a schematic diagram of the optical lens provided in Embodiment 12 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface R3 of the second lens L2 is concave, the object side surface S9 of the fifth lens L5 is convex, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0347] The relevant parameters of each lens in the optical lens of Example 12 are shown in Table 12-1.

[0348] Table 12-1

[0349]

[0350]

[0351] The surface profile parameters of the aspherical lens in the optical lens of Example 12 are shown in Table 12-2.

[0352] Table 12-2

[0353]

[0354]

[0355] 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 71 , Figure 72 , Figure 73 , Figure 74 , Figure 75 As shown.

[0356] from Figure 76 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0357] from Figure 77 As can be seen, the F-θ distortion of the optical lens is controlled within ±15%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0358] from Figure 74 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.

[0359] from Figure 75 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0360] from Figure 76 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.

[0361] Example 13

[0362] Please see Figure 77The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 13 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 a plane; the object side surface S3 of the second lens L2 is a concave surface; the object side surface S9 of the fifth lens L5 is a convex surface; the image side surface S12 of the sixth lens L6 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0363] The relevant parameters of each lens in the optical lens of Example 13 are shown in Table 13-1.

[0364] Table 13-1

[0365]

[0366]

[0367] The surface profile parameters of the aspherical lens in the optical lens of Example 13 are shown in Table 13-2.

[0368] Table 13-2

[0369] Figure 78 K B C D E F S3 -1.18E+01 8.38E-04 -2.31E-05 7.20E-07 -1.17E-08 7.56E-11 S4 -4.69E-01 1.60E-03 -2.39E-06 2.47E-05 -2.79E-06 1.47E-07 S5 1.89E-01 -4.27E-03 1.44E-04 1.86E-05 -1.04E-06 1.50E-09 S6 -3.63E+01 2.19E-03 3.97E-04 -3.07E-05 5.09E-06 -3.41E-07 S7 -5.00E+01 1.73E-02 -9.86E-04 1.54E-04 -1.78E-05 9.61E-07 S8 -2.03E+01 -2.24E-03 1.44E-03 -2.23E-04 3.66E-05 -1.12E-06 S9 -5.00E+01 4.85E-03 -8.07E-04 4.95E-05 -6.48E-06 -4.99E-07 S10 2.25E-02 9.26E-03 -1.10E-03 4.87E-05 -8.02E-07 -2.68E-08 S11 7.43E-01 4.82E-03 -1.67E-03 2.24E-04 -2.54E-05 1.41E-06 S12 -4.99E+01 -4.10E-03 2.21E-04 -9.34E-06 5.37E-07 -1.09E-08 S13 -5.16E+01 -2.18E-03 3.02E-04 -1.65E-05 4.90E-07 -6.62E-09 S14 -1.04E+00 -1.24E-03 2.36E-04 -1.70E-05 6.48E-07 -9.10E-09 S15 4.52E+00 -3.96E-03 2.11E-04 -6.20E-06 9.38E-08 -5.68E-10 S16 2.01E+00 -4.13E-03 1.73E-04 -4.32E-06 5.48E-08 -2.92E-10

[0370] 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 79 , Figure 80 , Figure 81 , Figure 82 , Figure 83 As shown.

[0371] from Figure 84 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.06mm, indicating that the optical lens can effectively correct field curvature.

[0372] from Figure 80 As can be seen, the F-θ distortion of the optical lens is controlled within ±10%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0373] from Figure 81 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1.5μm, indicating that the optical lens can effectively correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0374] from Figure 82 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens can effectively correct axial aberration.

[0375] from Figure 83As 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.

[0376] Example 14

[0377] Please see Figure 84 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 14 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 S5 of the third lens L3 is convex; and the image side surface S6 of the third lens L3 is concave. The optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0378] The relevant parameters of each lens in the optical lens of Example 14 are shown in Table 14-1.

[0379] Table 14-1

[0380]

[0381]

[0382] The surface profile parameters of the aspherical lens in the optical lens of Example 14 are shown in Table 14-2.

[0383] Table 14-2

[0384] Figure 85 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

[0385] 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 86 , Figure 87 , Figure 88 , Figure 89 , Figure 90 As shown.

[0386] from Figure 86 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.2mm, indicating that the optical lens can effectively correct the field curvature.

[0387] from Figure 87 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.

[0388] from Figure 88As 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.

[0389] from Figure 89 As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens can effectively correct axial aberration.

[0390] from Figure 90 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.

[0391] Example 15

[0392] Please see Figure 91 The figure shows a schematic diagram of the optical lens provided in Embodiment 15 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S5 of the third lens L3 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0393] The relevant parameters of each lens in the optical lens of Example 15 are shown in Table 15-1.

[0394] Table 15-1

[0395]

[0396] The surface profile parameters of the aspherical lens in the optical lens of Example 15 are shown in Table 15-2.

[0397] Table 15-2

[0398]

[0399]

[0400] 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 92 , Figure 93 , Figure 94 , Figure 95 , Figure 96 As shown.

[0401] from ​ 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.

[0402] from​ 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.

[0403] from ​ As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens can effectively correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0404] from ​ As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens can effectively correct axial aberration.

[0405] from ​ 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.

[0406] Example 16

[0407] Please see ​ The figure shows a schematic diagram of the optical lens provided in Embodiment 16 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object-side surface S5 of the third lens L3 is a convex surface; the object-side surface S9 of the fifth lens L5 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0408] The relevant parameters of each lens in the optical lens of Example 16 are shown in Table 16-1.

[0409] Table 16-1

[0410]

[0411]

[0412] The surface profile parameters of the aspherical lens in the optical lens of Example 16 are shown in Table 16-2.

[0413] Table 16-2

[0414] ​ K B C D E F S3 -1.37E+01 5.05E-04 -1.58E-05 7.25E-07 -1.65E-08 8.82E-11 S4 2.50E-01 -6.72E-04 -9.76E-05 4.29E-05 -6.24E-06 3.56E-07 S5 -5.05E+01 -2.42E-03 -2.78E-04 4.91E-05 -2.90E-06 1.88E-07 S6 -5.00E+01 5.94E-03 -2.32E-04 1.37E-06 1.56E-06 7.76E-08 S7 -3.16E+01 1.48E-02 -3.24E-04 1.34E-04 -2.46E-05 2.21E-06 S8 -2.14E+01 -2.58E-03 1.47E-03 -2.07E-04 4.52E-05 -1.65E-06 S9 5.00E+01 2.53E-03 -8.08E-04 4.84E-05 -2.22E-05 1.67E-06 S10 5.60E-02 7.60E-03 -1.04E-03 3.52E-05 -8.13E-08 -1.18E-07 S11 8.42E-01 5.49E-03 -1.64E-03 2.31E-04 -2.48E-05 1.37E-06 S12 3.95E+01 -4.37E-03 2.33E-04 -9.83E-06 4.95E-07 -1.21E-08 S13 3.74E+01 -3.10E-03 3.26E-04 -1.55E-05 4.92E-07 -7.74E-09 S14 -1.01E+00 -1.26E-03 2.27E-04 -1.66E-05 6.60E-07 -9.34E-09 S15 4.56E+00 -3.96E-03 2.18E-04 -6.29E-06 9.28E-08 -5.90E-10 S16 1.82E+00 -4.25E-03 1.82E-04 -4.38E-06 5.43E-08 -2.99E-10

[0415] 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: ​ , ​ , ​ , ​ ,​ As shown.

[0416] from ​ 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.

[0417] from ​ 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.

[0418] from ​ 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.

[0419] from ​ As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens can effectively correct axial aberration.

[0420] from ​ 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.

[0421] Please refer to Tables 17-1 and 17-2 for the optical characteristics corresponding to 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.

[0422] Table 17-1

[0423]

[0424]

[0425] Table 17-2

[0426]

[0427]

[0428] 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.

[0429] 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.

[0430] 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 negative optical power, whose image side is concave; A second lens with negative optical power, whose image side is concave; A third lens with positive optical power; A fourth lens with positive optical power, whose object side and image side are both convex; A fifth lens with positive optical power, whose image side is convex; A sixth lens with negative optical power, whose object side is concave; A seventh lens with positive optical power, whose object side is concave and whose image side is convex; An eighth lens with negative optical power; Wherein, the maximum field angle FOV of the optical lens satisfies: 150° < FOV ≤ 177°; The curvature radius R13 of the object side of the seventh lens and the curvature radius R14 of the image side of the seventh lens satisfy: 0 < (R13 - R14) / (R13 + R14) < 1.

2. The optical lens according to claim 1, characterized in that, The maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 49° < FOV / Fno < 69°.

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: 0.75 < BFL / f < 1.

2.

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: 7 < R7 / f < 110.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the curvature radius R13 of the object side of the seventh lens satisfy: -9.1 < R13 / f < -2.

2.

6. 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 R8 of the image side of the fourth lens satisfy: -62 < R7 / R8 < -3.

7. The optical lens according to claim 1, characterized in that, The focal length f4 of the fourth lens and the curvature radius R7 of the object side of the fourth lens satisfy: 2.2 < R7 / f4 < 40; the focal length f4 of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: -0.9 < R8 / f4 < -0.

4.

8. The optical lens according to claim 1, characterized in that, The focal length f7 of the seventh lens and the curvature radius R13 of the object side of the seventh lens satisfy: -4.42 ≤ R13 / f7 < -0.5; the focal length f7 of the seventh lens and the curvature radius R14 of the image side of the seventh lens satisfy: -0.6 < R14 / f7 < -0.

2.

9. The optical lens according to claim 1, characterized in that, The maximum field angle FOV of the optical lens satisfies: 166° ≤ FOV ≤ 177°; The curvature radius R13 of the object side of the seventh lens and the curvature radius R14 of the image side of the seventh lens satisfy: 0.5 < (R13 - R14) / (R13 + R14) < 0.

85.

10. The optical lens according to claim 1, characterized in that, The clear aperture semi-diameter d13 of the object side of the seventh lens and the sagittal height Sag13 of the clear aperture of the object side of the seventh lens satisfy: -0.2 < Sag13 / d13 < -0.0

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