An optical lens

Abstract

This application discloses an optical lens comprising, in sequence along the optical axis from the object side to the image side: a first lens having negative optical power; a second lens having optical power; a third lens having positive optical power, wherein the object side is concave and the image side is convex; a fourth lens having optical power; a fifth lens having optical power, wherein the optical power of the fifth lens is opposite in sign to that of the fourth lens; a sixth lens having negative optical power; a seventh lens having positive optical power, wherein the image side is convex; and an eighth lens having negative optical power.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens. Background Technology

[0002] In recent years, with the rapid development of optical lens technology, optical lenses have been widely used in various fields such as smartphones, tablets, vehicle monitoring, security monitoring, drone aerial photography, machine vision systems, and video conferencing. At the same time, the market's requirements for optical lenses are also constantly increasing. For example, in many application scenarios, optical systems not only need to have good optical performance, but also need to have a small size.

[0003] In view of the current state of optical lens development, those skilled in the art are dedicated to developing and designing a wide-angle lens that has good optical performance and simultaneously meets design requirements such as large aperture, high and low temperature, small size, and sufficient aberration correction. Summary of the Invention

[0004] This application provides an optical lens that, along the optical axis from the object side to the image side, may sequentially include: a first lens having negative optical power; a second lens having optical power; a third lens having positive optical power, wherein the object side is concave and the image side is convex; a fourth lens having optical power; a fifth lens having optical power, wherein the optical power of the fifth lens is opposite in sign to that of the fourth lens; a sixth lens having negative optical power; a seventh lens having positive optical power, wherein the image side is convex; and an eighth lens having negative optical power.

[0005] In one embodiment, the object-side surface of the first lens is convex, and the image-side surface is concave.

[0006] In one embodiment, the object-side surface of the second lens is convex, and the image-side surface is concave.

[0007] In one embodiment, the fourth lens has negative optical power, with its object side being convex and its image side being concave.

[0008] In one embodiment, the fourth lens has positive optical power, and its object-side surface is convex, as is its image-side surface.

[0009] In one embodiment, the fifth lens has positive optical power, and its object-side surface is convex, as is its image-side surface.

[0010] In one embodiment, the fifth lens has negative optical power, with its object side being concave and its image side being convex.

[0011] In one embodiment, the object-side surface of the sixth lens is concave, and the image-side surface is also concave.

[0012] In one embodiment, the object-side surface of the eighth lens is convex, and the image-side surface is concave.

[0013] In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical lens can satisfy: -2.0≤f1 / f≤-1.0.

[0014] In one embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the optical lens can satisfy: -7.2≤f2 / f≤6.0.

[0015] In one embodiment, the total effective focal length f of the optical lens and the radius of curvature R21 of the object side of the second lens and the radius of curvature R22 of the image side of the second lens can satisfy: 1.0≤f / R21+f / R22≤2.0.

[0016] In one embodiment, the effective focal length f3 of the third lens and the total effective focal length f of the optical lens can satisfy: 1.5≤f3 / f≤2.6.

[0017] In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens can satisfy: -5.0≤f4 / f5≤0.

[0018] In one embodiment, the effective focal length f6 of the sixth lens and the total effective focal length f of the optical lens can satisfy: -3.2≤f6 / f≤-1.2.

[0019] In one embodiment, the effective focal length f7 of the seventh lens and the total effective focal length f of the optical lens can satisfy: 1.2≤f7 / f≤2.5.

[0020] In one embodiment, the effective focal length f8 of the eighth lens and the total effective focal length f of the optical lens can satisfy: -11.2≤f8 / f≤-1.8.

[0021] In one embodiment, the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f8 of the eighth lens can satisfy: -1.1≤f45 / f8≤0.

[0022] In one embodiment, the Abbe number Vd4 of the fourth lens and the Abbe number Vd5 of the fifth lens can satisfy: 0.1≤Vd4 / Vd5≤3.0.

[0023] In one embodiment, the radius of curvature R12 of the image side of the first lens and the radius of curvature R21 of the object side of the second lens can satisfy: -0.7≤(R12-R21) / (R12+R21)≤-0.1.

[0024] In one embodiment, the center thickness T2 of the second lens on the optical axis and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis can satisfy: 0≤T2 / TTL≤0.2.

[0025] In one embodiment, the optical lens further includes an aperture stop, and the distance Ds between the aperture stop and the third lens on the optical axis and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis can satisfy: 0≤Ds / TTL≤0.1.

[0026] In one embodiment, the total effective focal length f of the optical lens and the entrance pupil diameter ENPD of the optical lens can satisfy: 1.9≤f / ENPD≤2.6.

[0027] In one embodiment, the distance BFL from the center of the image side of the eighth lens to the imaging surface of the optical lens on the optical axis and the total effective focal length f of the optical lens can satisfy: 0.4≤BFL / f≤0.8.

[0028] In one embodiment, the total effective focal length f of the optical lens and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis can satisfy: 0.1≤f / TTL≤0.5.

[0029] In one embodiment, the maximum field of view (FOV) of the optical lens, the maximum aperture D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens can satisfy: 1.0 ≤ (D × 180°) / (H × FOV) ≤ 2.0.

[0030] In one embodiment, the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis and the image height H corresponding to the maximum field of view of the optical lens can satisfy: 1.6≤TTL / H≤2.2.

[0031] In one embodiment, the total effective focal length f of the optical lens and the image height H corresponding to the maximum field of view of the optical lens can satisfy: 0.2≤f / H≤0.7.

[0032] In one embodiment, the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis, the maximum field of view (FOV) of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens can satisfy: 2.7 ≤ (TTL × 180°) / (H × FOV) ≤ 3.6.

[0033] The optical lens of this application uses eight lenses. By reasonably setting the parameters such as the optical power, surface shape, radius of curvature, Abbe number and center thickness of each lens, the lens can have at least one of the following beneficial effects: high resolution, large field of view, large aperture and small size. Attached Figure Description

[0034] Other features, objects, and advantages of this application will become more apparent from the following detailed description of the embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of an optical lens according to Embodiment 1 of this application;

[0036] Figure 2 This is a schematic diagram of the structure of an optical lens according to Embodiment 2 of this application;

[0037] Figure 3 This is a schematic diagram of the structure of the optical lens according to Embodiment 3 of this application;

[0038] Figure 4 This is a schematic diagram of the structure of an optical lens according to Embodiment 4 of this application; and

[0039] Figure 5 This is a schematic diagram of the structure of an optical lens according to Embodiment 5 of this application. Detailed Implementation

[0040] To facilitate understanding of this application, a more complete description of the application will be provided below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the 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.

[0041] 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 this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] 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.

[0043] 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 side is called the image-side surface of the lens.

[0044] 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.

[0045] 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 a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0046] 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.

[0047] The features, principles and other aspects of this application are described in detail below.

[0048] In an exemplary embodiment, the optical lens includes, for example, eight lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. These eight lenses are arranged sequentially along the optical axis from the object side to the image side.

[0049] In an exemplary embodiment, the first lens may have negative optical power; the second lens may have positive or negative optical power; the third lens may have positive optical power; the fourth lens may have positive or negative optical power; the fifth lens may have positive or negative optical power; the sixth lens may have negative optical power; the seventh lens may have positive optical power; the eighth lens may have negative optical power; and the fourth and fifth lenses may have optical powers with opposite positive and negative values.

[0050] In an exemplary embodiment, the first lens may have negative optical power. The object-side surface of the first lens may be convex, and the image-side surface may be concave. Having negative optical power in the first lens is beneficial for diverging light rays, ensuring a smooth transition of light paths after passing through the first lens. It also allows large-angle light rays to enter the first lens as much as possible, increasing light transmission and improving illuminance. Furthermore, it facilitates reducing the optical path length of subsequent light rays, achieving a short TTL and ensuring miniaturization.

[0051] In an exemplary embodiment, the second lens may have positive or negative optical power. The second lens may have a convex-concave surface. The object-side surface of the second lens is convex, so that the second lens can collect as much large-field-of-view light as possible from the image-side surface of the first lens, and then enter the rear optical system to achieve a large field of view.

[0052] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a concave-convex surface. The object side of the third lens is concave, and the image side is convex, so that the light rays diverging from the front lens can smoothly enter the rear through the third lens; at the same time, it is beneficial to correct higher aberrations and further helps to reduce the degree of relative illumination attenuation of the optical lens, thereby achieving high energy; since the third lens has positive optical power, it is beneficial to converge light rays and to achieve the characteristics of a large aperture.

[0053] In an exemplary embodiment, the fourth lens may have negative optical power. The fourth lens may have a convex-concave surface. The fourth lens has negative optical power, and its object-side surface is convex, which helps to raise the height of light entering the fourth lens and reduce chromatic aberration. The image-side surface of the fourth lens is concave, which helps to match the convex surface of the object-side surface of the fifth lens.

[0054] In an exemplary embodiment, the fourth lens may have positive optical power. The fourth lens may have a convex-convex surface. When the object-side and image-side surfaces of the fourth lens are both convex, the positive optical power can compensate for the spherical aberration introduced by the front lens of the fourth lens, further correct the aberrations generated by the front lens group, and at the same time make the light converge again. This can both increase the aperture of the optical lens and shorten the overall length of the lens, thus achieving miniaturization.

[0055] In an exemplary embodiment, the fifth lens may have positive optical power. The fifth lens may have a convex-convex surface. Having positive optical power, by rationally allocating the optical power of the fifth lens and the fourth lens, helps maintain stable imaging even at high and low temperatures. The object-side surface of the fifth lens is convex, which not only facilitates its cooperation with the fourth lens but also allows the light rays converged by the fourth lens, which has negative optical power, to smoothly enter the rear lens, improving the resolving power of the optical lens.

[0056] In an exemplary embodiment, the fifth lens may have negative optical power. The fifth lens may have a concave-convex surface. When the fifth lens has negative optical power and is a meniscus lens with a concave object side and a convex image side, it can converge the light beam, increase the aperture of the lens, and also make the optical system have a relatively short overall system length, ensuring miniaturization.

[0057] In an exemplary embodiment, the fourth and fifth lenses can be cemented together to form a cemented lens. The cemented lens itself can achromatic, reducing tolerance sensitivity, or it can retain some chromatic aberration to balance the chromatic aberration of the system; and the omission of the air gap can make the optical system more compact, meeting the miniaturization requirements. At the same time, it can reduce the tolerance sensitivity problems of lens units caused by tilting / eccentricity during the assembly process.

[0058] In an exemplary embodiment, the sixth lens may have negative optical power. The sixth lens may have a concave surface. The configuration of the sixth lens having negative optical power, with both the object-side and image-side surfaces being concave, facilitates a smooth transition of light paths and improves the resolving power of the optical lens.

[0059] In an exemplary embodiment, the seventh lens may have positive optical power. The image-side surface of the seventh lens may be convex. Having positive optical power and a convex image-side surface facilitates the convergence and adjustment of light rays, ensuring a smooth transition of light paths to the rear, thereby improving the resolving power of the optical lens.

[0060] In an exemplary embodiment, the eighth lens may have negative optical power. The eighth lens may have a convex-concave surface. The object-side surface of the eighth lens is convex, and the image-side surface is concave, which facilitates the smooth entry of light into the imaging plane and improves resolving power; at the same time, it allows various aberrations of the optical system to be fully corrected, and under the premise of compact structure, it can improve resolution, optimize optical performance such as distortion.

[0061] In an exemplary embodiment, the optical lens according to this application may further include an aperture stop, which may be located, for example, between the second lens and the third lens. It should be noted that the location of the aperture stop disclosed herein is merely an example and not a limitation; in alternative embodiments, the aperture stop may be set in other locations as needed.

[0062] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the imaging surface. Optionally, the photosensitive element disposed on the imaging surface may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS).

[0063] In an exemplary embodiment, at least one of the lenses included in the optical lens may be an aspherical lens. For example, in one embodiment, the first lens, the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens may be aspherical lenses.

[0064] In an exemplary embodiment, the object-side surface of the seventh lens may have at least one inflection point, which is beneficial for raising the light rays and allowing the light rays to smoothly transition to the imaging surface, thereby achieving a large target surface.

[0065] In an exemplary embodiment, the optical lens can be made of a glass-plastic hybrid material. This combination reduces costs and overcomes the problem of focus drift caused by the high coefficient of thermal expansion of plastic aspherical lenses in high and low temperature environments, thus better meeting the lens's usage requirements in such conditions.

[0066] An optical lens according to an exemplary embodiment of this application includes a first lens to an eighth lens arranged sequentially along the optical axis from the object side to the image side. The first lens has negative optical power; the second lens has optical power; the third lens has positive optical power, and its object side is concave while its image side is convex; the fourth and fifth lenses have optical powers of opposite polarities; the sixth lens has negative optical power; the seventh lens has positive optical power, and its image side is convex; and the eighth lens has negative optical power. This arrangement of the optical lens allows it to possess at least one of the following advantages: high resolution, large field of view, large aperture, and small size.

[0067] In an exemplary embodiment, the optical lens according to this application satisfies: -2.0 ≤ f1 / f ≤ -1.0, where f1 is the effective focal length of the first lens and f is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the first lens to the total effective focal length of the optical lens within this range, the focal length of the first lens is reasonably allocated, which is beneficial for light rays with a large field of view to enter the optical system.

[0068] In an exemplary embodiment, the optical lens according to this application satisfies: -7.2 ≤ f2 / f ≤ 6.0, where f2 is the effective focal length of the second lens and f is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the second lens to the total effective focal length of the optical lens within this range, incident light can be assisted in entering the optical system, and astigmatism can be effectively corrected to improve image quality.

[0069] In an exemplary embodiment, the optical lens according to this application satisfies: 1.0 ≤ f / R21 + f / R22 ≤ 2.0, where f is the total effective focal length of the optical lens, R21 is the radius of curvature of the object-side surface of the second lens, and R22 is the radius of curvature of the image-side surface of the second lens. By controlling the total effective focal length of the optical lens and the radius of curvature of the object-side surface and the image-side surface of the second lens to satisfy the condition 1.0 ≤ f / R21 + f / R22 ≤ 2.0, incident light can be assisted in entering the optical system, and astigmatism can be effectively corrected to improve image quality.

[0070] In an exemplary embodiment, the optical lens according to this application satisfies: 1.5 ≤ f3 / f ≤ 2.6, where f3 is the effective focal length of the third lens and f is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the third lens to the total effective focal length of the optical lens within this range, the light path between the second and fourth lenses can be controlled, reducing aberrations caused by large-angle light rays entering through the second lens, while also making the inter-lens structure compact, which is beneficial for miniaturization.

[0071] In an exemplary embodiment, the optical lens according to this application satisfies: -5.0 ≤ f4 / f5 ≤ 0, where f4 is the effective focal length of the fourth lens and f5 is the effective focal length of the fifth lens. By controlling the ratio of the effective focal length of the fourth lens to the effective focal length of the fifth lens within this range, the light path between the third and sixth lenses can be controlled, which helps to smooth the light transition, is beneficial for correcting chromatic aberration, improves image quality, and also helps to improve the thermal compensation of the optical lens.

[0072] In an exemplary embodiment, the optical lens according to this application satisfies: -3.2 ≤ f6 / f ≤ -1.2, where f6 is the effective focal length of the sixth lens and f is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the sixth lens to the total effective focal length of the optical lens within this range, it helps to smooth the light transition, reduce aberrations caused by excessively steep light paths or excessively large angles, and improve image quality.

[0073] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 1.2 ≤ f7 / f ≤ 2.5, where f7 is the effective focal length of the seventh lens and f is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the seventh lens to the total effective focal length of the optical lens within this range, it is beneficial for smooth light transition, corrects chromatic aberration, improves the resolving power of the optical lens, and enhances image quality.

[0074] In an exemplary embodiment, the optical lens according to this application satisfies: -11.2 ≤ f8 / f ≤ -1.8, where f8 is the effective focal length of the eighth lens and f is the total effective focal length of the optical lens. By controlling the ratio of the effective focal length of the eighth lens to the total effective focal length of the optical lens within this range, it is beneficial for light to reach the imaging plane smoothly, while reducing the system CRA and improving the resolution quality of the optical system.

[0075] In an exemplary embodiment, the optical lens according to this application satisfies: -1.1 ≤ f45 / f8 ≤ 0, where f45 is the combined focal length of the fourth and fifth lenses, and f8 is the effective focal length of the eighth lens. By controlling the ratio of the combined focal length of the fourth and fifth lenses to the effective focal length of the eighth lens within this range, the back focal length (BFL) shift of the optical lens is ensured to be very small in high and low temperature environments, achieving good temperature performance and thus guaranteeing the sharpness of the image formed by the optical lens.

[0076] In an exemplary embodiment, the optical lens according to this application satisfies: 0.1 ≤ Vd4 / Vd5 ≤ 3.0, where Vd4 is the Abbe number of the fourth lens and Vd5 is the Abbe number of the fifth lens. By controlling the ratio of the Abbe number of the fourth lens to the Abbe number of the fifth lens within this range, chromatic aberration can be corrected.

[0077] In an exemplary embodiment, the optical lens according to this application satisfies: -0.7 ≤ (R12 - R21) / (R12 + R21) ≤ -0.1, where R12 is the radius of curvature of the image-side surface of the first lens and R21 is the radius of curvature of the object-side surface of the second lens. By controlling the radius of curvature of the image-side surface of the first lens and the radius of curvature of the object-side surface of the second lens to satisfy the condition -0.7 ≤ (R12 - R21) / (R12 + R21) ≤ -0.1, aberrations of the optical system can be corrected, and it can be ensured that when the light rays emitted from the first lens are incident on the object-side surface of the second lens, the incident light rays are relatively smooth, thereby reducing the tolerance sensitivity of the optical system.

[0078] In an exemplary embodiment, the optical lens according to this application satisfies: 0 ≤ T2 / TTL ≤ 0.2, where T2 is the center thickness of the second lens on the optical axis, and TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens. By controlling the ratio of the center thickness of the second lens on the optical axis to the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens within this range, the thickness of the second lens is made thinner, which is beneficial to reducing the lens TTL, miniaturization, and cost reduction.

[0079] In an exemplary embodiment, the optical lens according to this application satisfies 0 ≤ Ds / TTL ≤ 0.1, where Ds is the distance between the aperture stop and the third lens on the optical axis, and TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis. By controlling the ratio of the distance between the aperture stop and the third lens on the optical axis to the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis within this range, the distance between the third lens and the aperture stop can be made smaller, resulting in a smoother transition of light near the aperture stop, which is beneficial for improving image quality.

[0080] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 1.9 ≤ f / ENPD ≤ 2.6, where f is the total effective focal length of the optical lens and ENPD is the entrance pupil diameter of the optical lens. By controlling the ratio of the total effective focal length to the entrance pupil diameter of the optical lens within this range, a large aperture can be ensured, thereby achieving a greater amount of light transmission.

[0081] In an exemplary embodiment, the optical lens according to this application satisfies: 0.4 ≤ BFL / f ≤ 0.8, where BFL is the distance on the optical axis from the center of the image-side surface of the eighth lens to the imaging plane of the optical lens, and f is the total effective focal length of the optical lens. By controlling the ratio of the distance on the optical axis from the center of the image-side surface of the eighth lens to the imaging plane of the optical lens to the total effective focal length of the optical lens within this range, it is beneficial to increase the assembly yield and also helps to enable the optical lens to have a sufficiently long back focal length (BFL) to accommodate other optical components, thereby increasing design flexibility.

[0082] In an exemplary embodiment, the optical lens according to this application satisfies: 0.1 ≤ f / TTL ≤ 0.5, where f is the total effective focal length of the optical lens, and TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens. By controlling the ratio of the total effective focal length of the optical lens to the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical lens within this range, the total length of the optical lens can be effectively limited, which is beneficial for miniaturizing the optical lens.

[0083] In an exemplary embodiment, the optical lens according to this application satisfies: 1.0 ≤ (D × 180°) / (H × FOV) ≤ 2.0, where FOV is the maximum field of view of the optical lens, D is the maximum aperture of the object-side surface of the first lens corresponding to the maximum field of view of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens. By controlling the maximum field of view of the optical lens, the maximum aperture of the object-side surface of the first lens corresponding to the maximum field of view of the optical lens, and the image height corresponding to the maximum field of view of the optical lens to satisfy the condition 1.0 ≤ (D × 180°) / (H × FOV) ≤ 2.0, a small front aperture of the optical lens can be ensured, which is beneficial for miniaturization.

[0084] In an exemplary embodiment, the optical lens according to this application satisfies: 1.6 ≤ TTL / H ≤ 2.2, where TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens. By controlling the ratio of the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens to the image height corresponding to the maximum field of view of the optical lens to be within this range, a large image area of ​​the optical lens can be achieved while compressing the overall length of the optical lens, making the design of the optical lens more miniaturized and lightweight, while ensuring low system sensitivity.

[0085] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 0.2 ≤ f / H ≤ 0.7, where f is the total effective focal length of the optical lens and H is the image height corresponding to the maximum field of view of the optical lens. By controlling the ratio of the total effective focal length of the optical lens to the image height corresponding to the maximum field of view of the optical lens within this range, it is beneficial to improve resolution.

[0086] In an exemplary embodiment, the optical lens according to this application satisfies the condition: 2.7 ≤ (TTL × 180°) / (H × FOV) ≤ 3.6, where TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens, FOV is the maximum field of view of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens. By controlling the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens, the maximum field of view of the optical lens, and the image height corresponding to the maximum field of view of the optical lens to satisfy the condition 2.7 ≤ (TTL × 180°) / (H × FOV) ≤ 3.6, the length of the optical lens can be effectively limited under the same imaging surface and the same field of view, which is beneficial for miniaturization.

[0087] In an exemplary embodiment, the optical lens of this application may further include a filter and / or protective glass disposed between the eighth lens and the imaging plane, as needed. The filter can filter light with a specific wavelength, and the protective glass can prevent damage to the image-side elements (e.g., chips) of the optical lens.

[0088] The optical lens according to the embodiments of this application can employ multiple lens elements, such as the eight elements described above. By reasonably setting parameters such as the optical power, surface shape, radius of curvature, Abbe number, and center thickness of each lens, the lens can have at least one of the following beneficial effects: high resolution, large field of view, large aperture, and small size.

[0089] However, those skilled in the art will understand that the number of lenses constituting the lens can be varied to obtain the various results and advantages described in this specification without departing from the technical solutions claimed in this application. For example, although eight lenses are described as an example in the embodiments, the optical lens is not limited to including eight lenses. If desired, the optical lens may also include other numbers of lenses. Specific embodiments of the optical lens applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0090] Example 1

[0091] Figure 1 This is a schematic diagram of the optical lens according to Embodiment 1 of this application, as shown below. Figure 1 The optical lens according to Embodiment 1 of this application is described.

[0092] like Figure 1 As shown, the optical lens, along the optical axis from the object side to the image side, sequentially includes: a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter and / or protective glass C, and an imaging surface. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens.

[0093] In this embodiment, the first lens L1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens L3 has positive optical power, its object-side surface S6 is concave, and its image-side surface S7 is convex. The fourth lens L4 has negative optical power, its object-side surface S8 is convex, and its image-side surface S9 is concave. The fifth lens L5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens L6 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave. The seventh lens L7 has positive optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex. The eighth lens L8 has negative optical power, its object-side surface S15 is convex, and its image-side surface S16 is concave.

[0094] In this embodiment, the aperture stop STO of the optical lens is positioned between the second lens L2 and the third lens L3.

[0095] In this embodiment, the filter and / or protective glass C located between the eighth lens L8 and the imaging surface has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface, where an image sensor chip IMA may be disposed.

[0096] Table 1 shows the radius of curvature R, thickness d / distance T, refractive index N, and Abbe number Vd of each lens in the optical lens of Embodiment 1. Regarding "thickness d / distance T", it should be understood that the thickness d / distance T in the row containing S1 is the center thickness of the first lens L1, the thickness d / distance T in the row containing S2 is the air gap distance between the first lens L1 and the second lens L2, the thickness d / distance T in the row containing S3 is the center thickness of the second lens L2, and so on.

[0097]

[0098] Table 1

[0099] In Example 1, the object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0100]

[0101] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A16 that can be used for each aspherical mirror S1 to S4, S6, S7 and S11 to S16 in Example 1. 10 and A 12 .

[0102] Face number k A4 A6 A8 A10 A12 S1 -50 4.66E-03 -5.26E-04 3.67E-05 -7.41E-07 0.00E+00 S2 0.094 -3.22E-03 -8.66E-04 4.95E-04 -2.33E-04 0.00E+00 S3 0.023 1.55E-02 2.90E-03 2.41E-04 -1.22E-04 0.00E+00 S4 5.842 3.63E-02 8.49E-03 1.07E-03 1.21E-03 0.00E+00 S6 3.197 8.28E-03 -1.62E-03 1.78E-03 -4.74E-04 0.00E+00 S7 -0.125 -3.78E-03 -1.19E-03 -2.78E-04 -2.50E-05 0.00E+00 S11 50 -1.33E-02 8.10E-04 -3.37E-04 2.50E-05 0.00E+00 S12 -50 -3.26E-03 -8.37E-04 2.85E-05 4.99E-06 0.00E+00 S13 17.738 7.15E-03 -2.84E-03 2.59E-04 -8.58E-07 0.00E+00 S14 -4.667 -6.37E-03 -1.96E-04 7.23E-06 4.65E-06 0.00E+00 S15 -6.390 -1.40E-02 -6.93E-04 1.73E-04 -5.94E-06 0.00E+00 S16 -4.345 -1.40E-02 7.96E-04 -2.69E-05 7.41E-07 0.00E+00

[0103] Table 2

[0104] Example 2

[0105] Figure 2 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown below, with reference to the following. Figure 2 This paper describes an optical lens according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments.

[0106] like Figure 2 As shown, the optical lens includes, in sequence along the optical axis from the object side to the image side: a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter and / or protective glass C, and an imaging surface.

[0107] In this embodiment, the first lens L1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens L3 has positive optical power, with its object-side surface S6 being concave and its image-side surface S7 being convex. The fourth lens L4 has positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The fifth lens L5 has negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being convex. The sixth lens L6 has negative optical power, with its object-side surface S12 being concave and its image-side surface S13 being concave. The seventh lens L7 has positive optical power, with its object-side surface S14 being convex and its image-side surface S15 being convex. The eighth lens L8 has negative optical power, with its object-side surface S16 being convex and its image-side surface S17 being concave.

[0108] In this embodiment, the aperture stop STO of the optical lens is positioned between the second lens L2 and the third lens L3.

[0109] In this embodiment, the filter and / or protective glass C located between the eighth lens L8 and the imaging surface has an object-side surface S18 and an image-side surface S19. Light from the object passes sequentially through each surface S1 to S19 and is finally imaged on the imaging surface, where an image sensor chip IMA may be disposed. Table 3 shows the radius of curvature R, thickness d / distance T, refractive index N, and Abbe number Vd of each lens in the optical lens of Embodiment 2.

[0110]

[0111] Table 3

[0112] In this embodiment, the object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all aspherical surfaces, and the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. Table 4 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, and A6 of each aspherical mirror surface S1 to S4, S6, S7 and S12 to S17 that can be used in this embodiment. 10 and A 12 .

[0113]

[0114]

[0115] Table 4

[0116] Example 3

[0117] Figure 3 A schematic diagram of the optical lens according to Embodiment 3 of this application is shown below, with reference to the following. Figure 3The optical lens according to Embodiment 3 of this application is described.

[0118] like Figure 3 As shown, the optical lens, along the optical axis from the object side to the image side, sequentially includes: a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter and / or protective glass C, and an imaging surface. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens.

[0119] In this embodiment, the first lens L1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens L3 has positive optical power, with its object-side surface S6 being concave and its image-side surface S7 being convex. The fourth lens L4 has positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The fifth lens L5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens L6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens L7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens L8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave.

[0120] In this embodiment, the aperture stop STO of the optical lens is positioned between the second lens L2 and the third lens L3.

[0121] In this embodiment, the filter and / or protective glass C located between the eighth lens L8 and the imaging surface has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface, where an image sensor chip IMA may be disposed.

[0122] Table 5 shows the radius of curvature R, thickness d / distance T, refractive index N, and Abbe number Vd of each lens in the optical lens of Example 3.

[0123]

[0124]

[0125] Table 5

[0126] In this embodiment, the object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all aspherical surfaces, and the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. Table 6 gives the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 of each aspherical mirror surface S1 to S4, S6, S7, and S11 to S16 that can be used in this embodiment. 10 and A 12 .

[0127] Face number k A4 A6 A8 A10 A12 S1 -18.473 3.51E-03 -2.69E-04 1.41E-05 -1.74E-07 0.00E+00 S2 -0.294 -3.50E-03 -1.12E-03 3.68E-04 -1.14E-04 0.00E+00 S3 -2.528 1.24E-02 6.27E-04 2.78E-04 -1.33E-04 0.00E+00 S4 0.835 2.98E-02 6.40E-03 4.85E-04 3.00E-04 0.00E+00 S6 3.997 8.68E-03 -1.49E-03 1.27E-03 -3.85E-04 0.00E+00 S7 -0.203 -3.36E-03 -1.32E-03 -1.46E-04 -7.20E-05 0.00E+00 S11 -11.603 -1.26E-02 1.78E-03 -4.18E-04 1.99E-05 0.00E+00 S12 -27.158 4.49E-03 -1.32E-03 6.00E-05 1.92E-07 0.00E+00 S13 19.361 1.28E-02 -3.13E-03 2.96E-04 -1.40E-05 0.00E+00 S14 -4.619 1.03E-02 -8.46E-04 1.03E-04 -6.71E-06 0.00E+00 S15 -4.209 -1.34E-02 -2.28E-04 1.34E-04 -5.33E-06 0.00E+00 S16 -3.974 -1.59E-02 1.10E-03 -5.76E-05 1.89E-06 0.00E+00

[0128] Table 6

[0129] Example 4

[0130] Figure 4 A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown below, with reference to the following. Figure 4 The optical lens according to Embodiment 4 of this application is described.

[0131] like Figure 4 As shown, the optical lens, along the optical axis from the object side to the image side, sequentially includes: a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter and / or protective glass C, and an imaging surface. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens.

[0132] In this embodiment, the first lens L1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens L3 has positive optical power, its object-side surface S6 is concave, and its image-side surface S7 is convex. The fourth lens L4 has negative optical power, its object-side surface S8 is convex, and its image-side surface S9 is concave. The fifth lens L5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens L6 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave. The seventh lens L7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex. The eighth lens L8 has negative optical power, its object-side surface S15 is convex, and its image-side surface S16 is concave.

[0133] In this embodiment, the aperture stop STO of the optical lens is positioned between the second lens L2 and the third lens L3.

[0134] In this embodiment, the filter and / or protective glass C located between the eighth lens L8 and the imaging surface has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface, where an image sensor chip IMA may be disposed.

[0135] Table 7 shows the radius of curvature R, thickness d / distance T, refractive index N, and Abbe number Vd of each lens in the optical lens of Example 4.

[0136]

[0137] Table 7

[0138] In this embodiment, the object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all aspherical surfaces, and the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. Table 8 gives the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 of each aspherical mirror surface S1 to S4, S6, S7, and S11 to S16 that can be used in this embodiment. 10 and A 12 .

[0139]

[0140]

[0141] Table 8

[0142] Example 5

[0143] Figure 5 A schematic diagram of the structure of an optical lens according to Embodiment 5 of this application is shown below, with reference to the following. Figure 5 The optical lens according to Embodiment 5 of this application is described.

[0144] like Figure 5 As shown, the optical lens includes, in sequence along the optical axis from the object side to the image side: a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter and / or protective glass C, and an imaging surface.

[0145] In this embodiment, the first lens L1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens L3 has positive optical power, its object-side surface S6 is concave, and its image-side surface S7 is convex. The fourth lens L4 has negative optical power, its object-side surface S8 is convex, and its image-side surface S9 is concave. The fifth lens L5 has positive optical power, its object-side surface S10 is convex, and its image-side surface S11 is convex. The sixth lens L6 has negative optical power, its object-side surface S12 is concave, and its image-side surface S13 is concave. The seventh lens L7 has positive optical power, its object-side surface S14 is convex, and its image-side surface S15 is convex. The eighth lens L8 has negative optical power, its object-side surface S16 is convex, and its image-side surface S17 is concave.

[0146] In this embodiment, the aperture stop STO of the optical lens is positioned between the second lens L2 and the third lens L3.

[0147] In this embodiment, the filter and / or protective glass C located between the eighth lens L8 and the imaging surface has an object-side surface S18 and an image-side surface S19. Light from the object passes sequentially through each surface S1 to S19 and is finally imaged on the imaging surface, where an image sensor chip IMA may be disposed. Table 9 shows the radius of curvature R, thickness d / distance T, refractive index N, and Abbe number Vd of each lens in the optical lens of Embodiment 5.

[0148]

[0149]

[0150] Table 9

[0151] In this embodiment, the object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all aspherical surfaces, and the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. Table 10 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, and A6 of each aspherical mirror surface S1 to S4, S6, S7 and S12 to S17 that can be used in this embodiment. 10 and A 12 .

[0152] Face number k A4 A6 A8 A10 A12 S1 0.000 3.76E-03 -3.01E-04 1.06E-05 -6.26E-08 -1.62E-08 S2 -0.668 3.33E-03 2.41E-04 4.90E-04 -8.62E-05 4.02E-06 S3 -3.132 7.00E-03 1.16E-04 2.72E-04 -9.39E-05 -1.76E-06 S4 8.714 1.58E-02 3.03E-03 1.56E-03 -8.62E-06 3.46E-04 S6 22.184 8.21E-03 2.22E-03 1.26E-03 -1.51E-03 6.47E-04 S7 -0.185 -5.22E-03 -1.34E-03 -2.49E-04 3.86E-05 -2.31E-05 S12 27.021 -1.90E-02 2.63E-03 -4.42E-04 1.15E-05 -5.96E-07 S13 -17.604 -1.80E-03 -9.44E-04 1.57E-04 -8.86E-06 3.75E-07 S14 -10.860 8.79E-03 -3.26E-03 3.19E-04 -9.24E-06 -1.23E-07 S15 -9.576 2.95E-03 -4.57E-04 -6.26E-05 7.78E-06 6.68E-08 S16 -2.797 -1.27E-02 -3.80E-04 1.44E-04 -5.70E-06 -3.27E-08 S17 -2.784 -1.48E-02 1.21E-03 -5.49E-05 4.82E-07 -3.85E-08

[0153] Table 10

[0154] In summary, Examples 1 to 5 satisfy the relationships shown in Table 11 below.

[0155]

[0156]

[0157] Table 11

[0158] This application also provides an electronic device that may include an optical lens according to the above embodiments of this application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0159] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, Along the optical axis from the object side to the image side, the following are included in sequence: A first lens with negative optical power; A second lens with optical power; A third lens with positive optical power has a concave object side and a convex image side. A fourth lens with optical power; A fifth lens having optical power, and its optical power being positive and negative opposite to that of the fourth lens; A sixth lens with negative optical power; A seventh lens with positive optical power, its image-side surface being convex; and An eighth lens with negative optical power; Wherein, the maximum field of view (FOV) of the optical lens, the maximum aperture D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 1.234≤(D×180°) / (H×FOV)≤1.

774.

2. The optical lens according to claim 1, characterized in that, The object side of the first lens is convex, and the image side is concave.

3. The optical lens according to claim 1, characterized in that, The object-side surface of the second lens is convex, and the image-side surface is concave.

4. The optical lens according to claim 1, characterized in that, The fourth lens has negative optical power, with its object side being convex and its image side being concave.

5. The optical lens according to claim 1, characterized in that, The fourth lens has positive optical power, and its object side and image side are both convex.

6. The optical lens according to claim 1, characterized in that, The fifth lens has positive optical power, and its object side and image side are both convex.

7. The optical lens according to claim 1, characterized in that, The fifth lens has negative optical power, with its object side being concave and its image side being convex.

8. The optical lens according to claim 1, characterized in that, The object-side surface of the sixth lens is concave, and the image-side surface is also concave.

9. The optical lens according to claim 1, characterized in that, The object-side surface of the eighth lens is convex, and the image-side surface is concave.

10. The optical lens according to any one of claims 1 to 9, characterized in that, The effective focal length f1 of the first lens and the total effective focal length f of the optical lens satisfy: -1.720≤f1 / f≤-1.

161.

11. The optical lens according to any one of claims 1 to 9, characterized in that, The effective focal length f2 of the second lens and the total effective focal length f of the optical lens satisfy: -6.957≤f2 / f≤5.

833.

12. The optical lens according to any one of claims 1 to 9, characterized in that, The total effective focal length f of the optical lens and the radius of curvature R21 of the object side of the second lens and the radius of curvature R22 of the image side of the second lens satisfy the following condition: 1.346≤f / R21+f / R22≤1.

705.

13. The optical lens according to any one of claims 1 to 9, characterized in that, The effective focal length f3 of the third lens and the total effective focal length f of the optical lens satisfy the following condition: 1.772≤f3 / f≤2.

380.

14. The optical lens according to any one of claims 1 to 9, characterized in that, The effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy the condition: -4.785≤f4 / f5≤-0.

178.

15. The optical lens according to any one of claims 1 to 9, characterized in that, The effective focal length f6 of the sixth lens and the total effective focal length f of the optical lens satisfy the following condition: -2.976≤f6 / f≤-1.

522.

16. The optical lens according to any one of claims 1 to 9, characterized in that, The effective focal length f7 of the seventh lens and the total effective focal length f of the optical lens satisfy the following condition: 1.452≤f7 / f≤2.

180.

17. The optical lens according to any one of claims 1 to 9, characterized in that, The effective focal length f8 of the eighth lens and the total effective focal length f of the optical lens satisfy the following condition: -10.953≤f8 / f≤-2.

029.

18. The optical lens according to any one of claims 1 to 9, characterized in that, The combined focal length f45 of the fourth and fifth lenses and the effective focal length f8 of the eighth lens satisfy the following condition: -0.836≤f45 / f8≤0.

157.

19. The optical lens according to any one of claims 1 to 9, characterized in that, The Abbe number Vd4 of the fourth lens and the Abbe number Vd5 of the fifth lens satisfy the condition: 0.445≤Vd4 / Vd5≤2.

668.

20. The optical lens according to any one of claims 1 to 9, characterized in that, The radius of curvature R12 of the image side of the first lens and the radius of curvature R21 of the object side of the second lens satisfy: -0.363≤(R12-R21) / (R12+R21)≤-0.

276.

21. The optical lens according to any one of claims 1 to 9, characterized in that, The center thickness T2 of the second lens on the optical axis and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following: 0.043≤T2 / TTL≤0.

095.

22. The optical lens according to any one of claims 1 to 9, characterized in that, The optical lens further includes an aperture stop, and the distance Ds between the aperture stop and the third lens on the optical axis and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.009≤Ds / TTL≤0.

020.

23. The optical lens according to any one of claims 1 to 9, characterized in that, The total effective focal length f of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following condition: 2.163≤f / ENPD≤2.

454.

24. The optical lens according to any one of claims 1 to 9, characterized in that, The distance BFL from the center of the image side of the eighth lens to the imaging surface of the optical lens on the optical axis satisfies the following condition: 0.530≤BFL / f≤0.

617.

25. The optical lens according to any one of claims 1 to 9, characterized in that, The total effective focal length f of the optical lens and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following: 0.211≤f / TTL≤0.

246.

26. The optical lens according to any one of claims 1 to 9, characterized in that, The distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis and the image height H corresponding to the maximum field of view of the optical lens satisfy: 1.809≤TTL / H≤2.

059.

27. The optical lens according to any one of claims 1 to 9, characterized in that, The total effective focal length f of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.382≤f / H≤0.

458.

28. The optical lens according to any one of claims 1 to 9, characterized in that, The distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis, the maximum field of view (FOV) of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 2.961≤(TTL×180°) / (H×FOV)≤3.369.

Images