CN220357310U

CN220357310U - Optical lens

Info

Publication number: CN220357310U
Application number: CN202321393449.XU
Authority: CN
Inventors: 梁伟朝; 应永茂; 蓝岚
Original assignee: Sunny Optics Zhongshan Co Ltd
Current assignee: Sunny Optics Zhongshan Co Ltd
Priority date: 2023-06-02
Filing date: 2023-06-02
Publication date: 2024-01-16
Anticipated expiration: 2033-06-02

Abstract

The application discloses optical lens, this optical lens includes in order from the object side to the image side along the optical axis: a first lens having negative optical power; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; a fourth lens having optical power; a fifth lens with optical power, wherein the optical power of the fifth lens is positive and negative opposite to that of the fourth lens; a sixth lens having negative optical power; a seventh lens having positive optical power; and an eighth lens having negative optical power. The effective focal length f3 of the third lens and the total effective focal length f of the optical lens satisfy: f3/f is more than or equal to 1.5 and less than or equal to 2.6.

Description

Optical lens

Technical Field

The present application relates to the field of optical elements, and more particularly, to an optical lens.

Background

In recent years, with the rapid development of optical lens technology, optical lenses are widely applied to various fields such as smart phones, tablet personal computers, vehicle-mounted monitoring, security monitoring, unmanned aerial vehicle aerial photography, machine vision systems, video conferences and the like. Meanwhile, the requirements of the market for optical lenses are increasing, for example, in many application scenarios, the optical system needs to have good optical performance and smaller size.

Aiming at the current development situation of the optical lens, the skilled in the art is dedicated to develop and design a wide-angle lens with good optical performance and meeting the design requirements of large aperture, high and low temperature, small volume, and fully corrected aberration.

Disclosure of Invention

The application provides an optical lens, which sequentially comprises from an object side to an image side along an optical axis: a first lens having negative optical power; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; a fourth lens having optical power; a fifth lens with optical power, wherein the optical power of the fifth lens is positive and negative opposite to the optical power of the fourth lens; a sixth lens having negative optical power; a seventh lens having positive optical power; and an eighth lens having negative optical power. The effective focal length f3 of the third lens and the total effective focal length f of the optical lens can satisfy: f3/f is more than or equal to 1.5 and less than or equal to 2.6.

In one embodiment, the image side of the first lens is concave; the object side surface of the fourth lens is a convex surface; the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface is a concave surface; the image side surface of the seventh lens is a convex surface; and the object side surface of the eighth lens is a convex surface, and the image side surface is a concave surface.

In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical lens may satisfy: -2.0.ltoreq.f1/f.ltoreq.1.0.

In one embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the optical lens may satisfy: -f 2/f is 7.2 or less and 6.0 or less.

In one embodiment, the total effective focal length f of the optical lens and the radius of curvature R21 of the object side surface of the second lens and the radius of curvature R22 of the image side surface of the second lens may satisfy: f/R21+fR22 is more than or equal to 1.0 and less than or equal to 2.0.

In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens may satisfy: -f 4/f5 is less than or equal to 5.0 and less than or equal to 0.

In one embodiment, the effective focal length f6 of the sixth lens and the total effective focal length f of the optical lens may satisfy: -3.2.ltoreq.f6/f.ltoreq.1.2.

In one embodiment, the effective focal length f7 of the seventh lens and the total effective focal length f of the optical lens may satisfy: f7/f is more than or equal to 1.2 and less than or equal to 2.5.

In one embodiment, the effective focal length f8 of the eighth lens and the total effective focal length f of the optical lens may satisfy: -11.2.ltoreq.f8/f.ltoreq.1.8.

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 may satisfy: -1.1.ltoreq.f45/f8.ltoreq.0.

In one embodiment, the abbe number Vd4 of the fourth lens and the abbe number Vd5 of the fifth lens may satisfy: vd4/Vd5 is more than or equal to 0.1 and less than or equal to 3.0.

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 may satisfy: -0.7 < R12-R21)/(R12+R21) < 0.1.

In one embodiment, a center thickness T2 of the second lens on the optical axis and a distance TTL between a center of the object side surface of the first lens and an imaging surface of the optical lens on the optical axis may satisfy: T2/TTL is more than or equal to 0 and less than or equal to 0.2.

In one embodiment, the optical lens further includes a diaphragm, and a distance Ds between the diaphragm and the third lens on the optical axis and a distance TTL between a center of an object side surface of the first lens and an imaging surface of the optical lens on the optical axis may satisfy: ds/TTL is more than or equal to 0 and less than or equal to 0.1.

In one embodiment, the total effective focal length f of the optical lens and the entrance pupil diameter ENPD of the optical lens may satisfy: f/ENPD is more than or equal to 1.9 and less than or equal to 2.6.

In one embodiment, a distance BFL between a center of an image side surface of the eighth lens and an imaging surface of the optical lens on the optical axis and a total effective focal length f of the optical lens may satisfy: BFL/f is more than or equal to 0.4 and less than or equal to 0.8.

In one embodiment, the total effective focal length f of the optical lens and the distance TTL between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis may be as follows: f/TTL is more than or equal to 0.1 and less than or equal to 0.5.

In one embodiment, the maximum field angle FOV of the optical lens, the maximum aperture D of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: 1.0.ltoreq.D.times.180°)/(H.times.FOV.ltoreq.2.0.

In one embodiment, the distance TTL between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis and the image height H corresponding to the maximum field angle of the optical lens may satisfy: TTL/H is less than or equal to 1.6 and less than or equal to 2.2.

In one embodiment, the image height H of the total effective focal length f of the optical lens corresponding to the maximum field angle of the optical lens may satisfy: f/H is more than or equal to 0.2 and less than or equal to 0.7.

In one embodiment, a distance TTL from a center of the object side surface of the first lens to an imaging surface of the optical lens on the optical axis, an image height H of a maximum field angle FOV of the optical lens corresponding to the maximum field angle of the optical lens may satisfy: 2.7.ltoreq.TTL.times.180°)/(H.times.FOV.ltoreq.3.6.

The optical lens has the beneficial effects that eight lenses are adopted, and the lens has at least one of high resolution, large field angle, large aperture, small size and the like by reasonably setting parameters such as focal power, surface type, curvature radius, abbe number, center thickness and the like of each lens.

Drawings

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

fig. 1 is a schematic structural view of an optical lens according to embodiment 1 of the present application;

fig. 2 is a schematic structural view of an optical lens according to embodiment 2 of the present application;

fig. 3 is a schematic structural view of an optical lens according to embodiment 3 of the present application;

fig. 4 is a schematic structural view of an optical lens according to embodiment 4 of the present application; and

fig. 5 is a schematic structural view of an optical lens according to embodiment 5 of the present application.

Detailed Description

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position 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 referred to as the object side of the lens, and the surface of each lens closest to the imaging side is referred to as the image side of the lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

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

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The features, principles, and other aspects of the present application are described in detail below.

In an exemplary embodiment, the optical lens includes, for example, eight lenses having optical power, i.e., 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. The eight lenses are arranged in order from the object side to the image side along the optical axis.

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; the fourth lens and the fifth lens may have opposite powers.

In an exemplary embodiment, the first lens may have negative optical power. The image side surface of the first lens may be concave. The first lens has negative focal power, so that light is radiated, the trend of the light after passing through the first lens is smoothly transited, and meanwhile, the light with a large angle enters the first lens as much as possible, the light quantity is increased, and the illumination is improved; the reduction of the optical path of the rear light is facilitated, so that short TTL is realized, and miniaturization is ensured.

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

In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a concave-convex shape. The object side surface of the third lens is a concave surface, and the image side surface is a convex surface, so that light rays diffused by the front lens can smoothly enter the rear through the third lens; meanwhile, the method is favorable for correcting the advanced aberration, is more favorable for reducing the attenuation degree of the relative illuminance of the optical lens, and realizes high energy; the third lens has positive focal power, so that the convergence of light rays is facilitated, and the large aperture is realized.

In an exemplary embodiment, the fourth lens may have negative optical power. The fourth lens may have a convex-concave shape. The fourth lens has negative focal power, the object side surface of the fourth lens is convex, the height of light rays entering the fourth lens is improved, chromatic aberration is reduced, and the image side surface of the fourth lens is concave and is beneficial to being matched with the convex surface of the object side surface of the fifth lens.

In an exemplary embodiment, the fourth lens may have positive optical power. The fourth lens may have a convex shape. When the object side surface and the image side surface of the fourth lens are both convex surfaces, the spherical aberration introduced by the front lens of the fourth lens can be compensated, the aberration generated by the front lens group can be further corrected, meanwhile, the light rays are converged again, the aperture of the optical lens can be increased, the total length of the lens can be shortened, and miniaturization is realized.

In an exemplary embodiment, the fifth lens may have positive optical power. The fifth lens may have a convex shape. The fifth lens has positive focal power, and the focal power of the fifth lens and the fourth lens is reasonably distributed, so that the imaging stability can be maintained at high and low temperatures. The object side surface of the fifth lens is a convex surface, so that the lens is favorable for being matched with the fourth lens, meanwhile, light converged by the fourth lens with negative focal power can smoothly enter the rear lens, and the resolving power of the optical lens is improved.

In an exemplary embodiment, the fifth lens may have negative optical power. The fifth lens may have a concave-convex type. When the fifth lens is a meniscus lens with a concave object side surface and a convex image side surface, the fifth lens can converge light beams, increase the aperture of the lens, ensure that the optical system has a relatively short total system length and ensure miniaturization.

In an exemplary embodiment, the fourth lens and the fifth lens may be cemented to form a cemented lens. The cemented lens itself can achromat itself, reduce tolerance sensitivity, and also can leave partial chromatic aberration to balance chromatic aberration of the system; and the omission of the air interval can make the whole compact optical system, meet the miniaturization requirement, and simultaneously can reduce the tolerance sensitivity problems of the lens units, such as inclination/core deflection and the like, caused in the assembling process.

In an exemplary embodiment, the sixth lens may have negative optical power. The sixth lens may have a concave surface. The sixth lens has negative focal power, and the object side surface is a concave surface, and the image side surface is a concave surface, so that smooth transition of light trend is facilitated, and the resolution of the optical lens is improved.

In an exemplary embodiment, the seventh lens may have positive optical power. The image side surface of the seventh lens may be convex. The seventh lens has positive focal power, and the image side is convex, so that light rays are converged, the light rays are regulated, the light rays move to the rear smoothly, and the resolution of the optical lens is improved.

In an exemplary embodiment, the eighth lens may have negative optical power. The eighth lens may have a convex-concave shape. The object side surface of the eighth lens is a convex surface, and the image side surface is a concave surface, so that light can smoothly enter the imaging surface, and the resolution capability is improved; meanwhile, various aberrations of the optical system are sufficiently corrected, and on the premise of compact structure, the resolution can be improved, and the optical performances such as distortion can be optimized.

In an exemplary embodiment, the optical lens according to the present application may further include a diaphragm, which may be located between the second lens and the third lens, for example. It should be noted that the positions of the diaphragms disclosed herein are merely examples and are not limiting; in alternative embodiments, the diaphragm may be arranged in other positions as desired.

In an exemplary embodiment, the optical lens may further include a photosensitive element disposed at the imaging surface. Alternatively, the photosensitive element provided to the imaging surface may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).

In an exemplary embodiment, the optical lens may include at least one aspherical lens among lenses. 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 lenses having aspherical surfaces.

In an exemplary embodiment, the object side surface of the seventh lens may have at least one inflection point, so as to facilitate lifting the light, enabling the light to smoothly transition to the imaging surface, and realizing a large target surface.

In an exemplary embodiment, the optical lens may be made of glass-plastic mixed materials. The glass-plastic mixed matching can reduce the cost, can overcome the problem that the focal point of the plastic aspherical lens is easy to drift in a high-low temperature environment due to large thermal expansion coefficient, and is favorable for meeting the use requirement of the lens in the high-low temperature environment.

The optical lens according to the exemplary embodiment of the present application includes first to eighth lenses arranged in order from an object side to an image side along an optical axis. The first lens has negative focal power; the second lens has optical power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the fourth lens and the fifth lens have positive and negative opposite focal power; the sixth lens has negative focal power; the seventh lens has positive optical power; the eighth lens has negative optical power. Meanwhile, the effective focal length f3 of the third lens and the total effective focal length f of the optical lens are controlled to be more than or equal to 1.5 and less than or equal to 2.6. By such arrangement of the optical lens, the optical lens can be made to have at least one of the advantageous effects of high resolution, large angle of view, large aperture, small size, and the like.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -2.0.ltoreq.f1/f.ltoreq.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. The ratio of the effective focal length of the first lens to the total effective focal length of the optical lens is controlled within the range, so that the focal length of the first lens is reasonably distributed, and light rays with a large field angle enter the optical system.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -7.2.ltoreq.f2/f.ltoreq.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 in the range, incident light can be assisted to enter the optical system, and astigmatism can be effectively corrected to improve imaging quality.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 1.0.ltoreq.f/R21+fR22.ltoreq.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 curvature radius of the object side surface of the second lens and the curvature radius of the image side surface of the second lens to be less than or equal to 1.0 and less than or equal to 2.0, the incident light can be assisted to enter the optical system, and astigmatism can be effectively corrected to improve imaging quality.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 1.5.ltoreq.f3/f.ltoreq.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 in the range, the light ray trend between the second lens and the fourth lens can be controlled, the aberration caused by the large-angle light ray entering through the second lens can be reduced, and meanwhile, the structure between the lenses is compact, so that the miniaturization is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -5.0.ltoreq.f4/f5.ltoreq.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 in this range, the light ray trend between the third lens and the sixth lens can be controlled, which is conducive to smooth transition of light rays, correction of chromatic aberration, improvement of imaging quality, and improvement of thermal compensation of the optical lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -3.2.ltoreq.f6/f.ltoreq.1.2, wherein f6 is the effective focal length of the sixth lens and f is the total effective focal length of the optical lens. The ratio of the effective focal length of the sixth lens to the total effective focal length of the optical lens is controlled within the range, so that smooth transition of light is facilitated, aberration caused by steep light trend, overlarge angle and the like is reduced, and image quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 1.2.ltoreq.f7/f.ltoreq.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. The ratio of the effective focal length of the seventh lens to the total effective focal length of the optical lens is controlled within the range, so that smooth transition of light rays is facilitated, chromatic aberration is corrected, the imaging capability of the optical lens is improved, and imaging quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -11.2.ltoreq.f8/f.ltoreq.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 in the range, light can smoothly reach the imaging surface, meanwhile, the system CRA is reduced, and the resolution quality of the optical system is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -1.1.ltoreq.f45/f8.ltoreq.0, where f45 is the combined focal length of the fourth lens and the fifth lens, and f8 is the effective focal length of the eighth lens. By controlling the ratio of the combined focal length of the fourth lens and the fifth lens to the effective focal length of the eighth lens in the range, the offset of the back focus BFL of the optical lens in a high-low temperature environment is ensured to be small, and good temperature performance is obtained, so that the imaging definition of the optical lens is ensured.

In an exemplary embodiment, an optical lens according to the present application may satisfy: vd4/Vd5 is more than or equal to 0.1 and less than or equal to 3.0, wherein 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 in this range, correction of chromatic aberration can be facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -0.7 +.ltoreq.R12-R21)/(R12+R21) +.0.1, where R12 is the radius of curvature of the image side of the first lens and R21 is the radius of curvature of the object side 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, the aberration of the optical system can be corrected, and the incident light is ensured to be gentle when the light emitted from the first lens is incident on the object side surface of the second lens, thereby reducing the tolerance sensitivity of the optical system.

In an exemplary embodiment, an optical lens according to the present application may satisfy: T2/TTL is more than or equal to 0 and less than or equal to 0.2, wherein T2 is the center thickness of the second lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis. The ratio of the center thickness of the second lens on the optical axis to the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is controlled to be in the range, so that the thickness of the second lens is thinner, the lens TTL is reduced, the miniaturization is realized, and the cost is reduced.

In an exemplary embodiment, the optical lens according to the present application may satisfy 0+.Ds/TTL+.0.1, where Ds is a distance between a stop of the optical lens and the third lens on the optical axis, and TTL is a distance between a center of an object side surface of the first lens and an imaging surface of the optical lens on the optical axis. The ratio of the distance between the diaphragm of the optical lens and the third lens on the optical axis to the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis is controlled to be in the range, so that the distance between the third lens and the diaphragm is smaller, light rays near the diaphragm are smoothly transited, and the imaging quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 1.9.ltoreq.f/ENPD.ltoreq.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 of the optical lens to the entrance pupil diameter of the optical lens in this range, a large aperture can be ensured, and a larger light flux can be realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: BFL/f is not less than 0.4 and not more than 0.8, wherein BFL is the distance between the center of the image side surface of the eighth lens and the imaging surface of the optical lens on the optical axis, and f is the total effective focal length of the optical lens. By controlling the ratio of the distance from the center of the image side surface of the eighth lens to the imaging surface of the optical lens on the optical axis to the total effective focal length of the optical lens in this range, the assembly yield is advantageously increased, and the optical lens is also advantageously provided with a Back Focus (BFL) long enough to place other optical elements, so as to increase design flexibility.

In an exemplary embodiment, an optical lens according to the present application may satisfy: f is more than or equal to 0.1 and less than or equal to 0.5, wherein f is the total effective focal length of the optical lens, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis. By controlling the ratio of the total effective focal length of the optical lens to the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis within the range, the total length of the optical lens can be effectively limited, and the miniaturization of the optical lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 1.0 & ltoreq (D x 180 DEG)/(H x FOV) & ltoreq 2.0, wherein FOV is the maximum field angle of the optical lens, D is the maximum aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. By controlling the maximum angle of view of the optical lens, the maximum aperture of light passing through the object side surface of the first lens corresponding to the maximum angle of view of the optical lens, and the image height corresponding to the maximum angle of view of the optical lens to satisfy the condition of 1.0 (D x 180 DEG)/(H x FOV) 2.0 or less, the front end aperture of the optical lens can be ensured to be small, which is beneficial to realizing miniaturization.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 1.6.ltoreq.TTL/H.ltoreq.2.2, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and H is the image height corresponding to the maximum field angle of the optical lens. By controlling the ratio of the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis to the image height corresponding to the maximum field angle of the optical lens in the range, the total length of the optical lens can be compressed while the large image surface of the optical lens is realized, so that the design of the optical lens is more miniaturized and light, and the low sensitivity of the system is ensured.

In an exemplary embodiment, an optical lens according to the present application may satisfy: f/H is more than or equal to 0.2 and less than or equal to 0.7, wherein f is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. The ratio of the total effective focal length of the optical lens to the image height corresponding to the maximum field angle of the optical lens is controlled in the range, so that the resolution is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 2.7.ltoreq.TTL×180°)/(H×FOV). Ltoreq.3.6, wherein TTL is the distance on the optical axis between the center of the object side surface of the first lens and the imaging surface of the optical lens, FOV is the maximum field angle of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. By controlling the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, the image height of the maximum field angle of the optical lens corresponding to the maximum field angle of the optical lens satisfies the condition of 2.7 (TTL×180 °)/(H×FOV) 3.6 or less, the length of the optical lens can be effectively limited under the same imaging surface and the same field angle, which is favorable for realizing miniaturization.

In an exemplary embodiment, the optical lens of the present application may further include a filter and/or a cover glass disposed between the eighth lens and the imaging surface, as needed. The optical filter may filter light having a specific wavelength, and the cover glass may prevent an image side element (e.g., a chip) of the optical lens from being damaged.

An optical lens according to an embodiment of the present application may employ a plurality of lenses, for example, eight lenses as described above. By reasonably setting parameters such as focal power, surface shape, curvature radius, abbe number, center thickness and the like of each lens, the lens has the beneficial effects of at least one of high resolution, large field angle, large aperture, small size and the like.

However, those skilled in the art will appreciate that the number of lenses making up a lens barrel may be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein. For example, although eight lenses are described as an example in the embodiment, the optical lens is not limited to include eight lenses. The optical lens may also include other numbers of lenses, if desired. Specific examples of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

Example 1

Fig. 1 is a schematic structural view of an optical lens according to embodiment 1 of the present application, and an optical lens according to embodiment 1 of the present application is described below with reference to fig. 1.

As shown in fig. 1, the optical lens sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a 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 a cover glass C, and an imaging plane. Wherein the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens.

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

In this embodiment, the stop STO of the optical lens is disposed between the second lens L2 and the third lens L3.

In this embodiment, the filter and/or cover glass C located between the eighth lens L8 and the imaging plane has an object side surface S17 and an image side surface S18. Light from the object passes sequentially through the respective surfaces S1 to S18 and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.

Table 1 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the optical lens of example 1. It should be understood that, regarding the "thickness d/distance T", the thickness d/distance T of the row where S1 is located is the center thickness of the first lens L1, the thickness d/distance T of the row where S2 is located is the air gap distance between the first lens L1 and the second lens L2, the thickness d/distance T of the row where S3 is located is the center thickness of the second lens L2, and so on.

TABLE 1

In embodiment 1, the object side surface and the image side surface of the first lens element L1, the second lens element L2, the third lens element L3, the sixth lens element L6, the seventh lens element L7 and the eighth lens element L8 are aspheric, and the surface profile x of each aspheric lens element can be defined by, but not limited to, the following aspheric formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The cone coefficients k and the higher order coefficients A usable for the respective aspherical mirror faces S1 to S4, S6, S7 and S11 to S16 in example 1 are shown in Table 2 below ₄ 、A ₆ 、A ₈ 、A ₁₀ And A ₁₂ 。

TABLE 2

Example 2

Fig. 2 shows a schematic structural view of an optical lens according to embodiment 2 of the present application, and an optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity.

As shown in fig. 2, the optical lens sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a 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 a cover glass C, and an imaging plane.

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

In this embodiment, the filter and/or cover glass C located between the eighth lens L8 and the imaging plane has an object side surface S18 and an image side surface S19. Light from the object passes sequentially through the respective surfaces S1 to S19 and is finally imaged on an imaging plane, where an image sensing chip IMA may be provided. Table 3 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the optical lens of example 2.

TABLE 3 Table 3

In this embodiment, the object-side surface and the image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the sixth lens element L6, the seventh lens element L7 and the eighth lens element L8 are aspheric, and each aspheric surface type can be implemented as described aboveThe formula (1) given in example 1 is defined. Table 4 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S1 to S4, S6, S7 and S12 to S17 used in this example ₄ 、A ₆ 、A ₈ 、A ₁₀ And A ₁₂ 。

Face number

k

A4

A6

A8

A10

A12

S1

0

4.60E-03

-3.40E-04

1.68E-05

-2.91E-07

0.00E+00

S2

-0.273

-5.42E-03

-1.16E-03

7.35E-04

-2.03E-04

0.00E+00

S3

-3.289

1.04E-02

7.94E-04

5.23E-04

-2.19E-04

0.00E+00

S4

0.638

3.07E-02

5.49E-03

1.85E-03

7.29E-05

0.00E+00

S6

-25.423

1.12E-02

-1.54E-03

2.26E-03

-7.77E-04

0.00E+00

S7

-0.331

-2.27E-03

-4.99E-04

-2.59E-04

8.98E-05

0.00E+00

S12

-13.659

-1.21E-02

1.75E-03

-4.64E-04

3.41E-05

0.00E+00

S13

-50

4.37E-03

-1.43E-03

1.24E-04

-4.02E-06

0.00E+00

S14

-2.190

6.75E-03

-2.26E-03

2.76E-04

-1.51E-05

0.00E+00

S15

-5.649

7.97E-03

-7.91E-04

1.09E-04

-6.58E-06

0.00E+00

S16

-5.647

-6.56E-03

-6.92E-04

1.24E-04

-4.21E-06

0.00E+00

S17

-4.720

-1.07E-02

7.97E-04

-5.15E-05

1.38E-06

0.00E+00

TABLE 4 Table 4

Example 3

Fig. 3 shows a schematic structural view of an optical lens according to embodiment 3 of the present application, and an optical lens according to embodiment 3 of the present application is described below with reference to fig. 3.

As shown in fig. 3, the optical lens sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a 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 a cover glass C, and an imaging plane. Wherein the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens.

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

Table 5 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the optical lens of example 3.

/>

TABLE 5

In this embodiment, the object-side surfaces and the image-side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the sixth lens element L6, the seventh lens element L7, and the eighth lens element L8 are aspherical surfaces, and each aspherical surface type can be defined by the formula (1) given in embodiment 1. Table 6 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S1 to S4, S6, S7 and S11 to S16 used in this example ₄ 、A ₆ 、A ₈ 、A ₁₀ And A ₁₂ 。

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

TABLE 6

Example 4

Fig. 4 shows a schematic structural view of an optical lens according to embodiment 4 of the present application, and an optical lens according to embodiment 4 of the present application is described below with reference to fig. 4.

As shown in fig. 4, the optical lens sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a 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 a cover glass C, and an imaging plane. Wherein the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens.

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

Table 7 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the optical lens of example 4.

TABLE 7

At the positionIn the embodiment, the object-side surfaces and the image-side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the sixth lens element L6, the seventh lens element L7 and the eighth lens element L8 are aspheric, and each aspheric surface type can be defined by the formula (1) given in the embodiment 1. Table 8 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S1 to S4, S6, S7 and S11 to S16 used in this example ₄ 、A ₆ 、A ₈ 、A ₁₀ And A ₁₂ 。

Face number

k

A4

A6

A8

A10

A12

S1

6.010

4.87E-03

-5.11E-04

3.15E-05

-6.52E-07

0.00E+00

S2

0.052

-2.65E-03

-9.16E-04

2.32E-04

-1.60E-04

0.00E+00

S3

1.051

1.46E-02

2.62E-03

-1.45E-03

-5.84E-05

0.00E+00

S4

3.731

3.86E-02

8.98E-03

-2.08E-03

1.64E-03

0.00E+00

S6

13.760

3.26E-03

-2.17E-03

1.69E-03

-3.08E-04

0.00E+00

S7

-0.114

-6.30E-03

-1.33E-03

-2.36E-04

-6.19E-05

0.00E+00

S11

21.175

-1.83E-02

1.31E-03

-1.73E-04

1.41E-05

0.00E+00

S12

-6.147

-5.78E-03

-5.67E-04

5.81E-05

2.20E-07

0.00E+00

S13

16.022

7.42E-03

-2.95E-03

2.10E-04

-2.46E-06

0.00E+00

S14

-5.326

-1.33E-03

-4.33E-04

3.21E-05

2.25E-06

0.00E+00

S15

-6.525

-1.68E-02

-5.20E-04

1.90E-04

-6.86E-06

0.00E+00

S16

-4.215

-1.66E-02

1.11E-03

-4.53E-05

1.27E-06

0.00E+00

TABLE 8

Example 5

Fig. 5 shows a schematic structural view of an optical lens according to embodiment 5 of the present application, and an optical lens according to embodiment 5 of the present application is described below with reference to fig. 5.

As shown in fig. 5, the optical lens sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a 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 a cover glass C, and an imaging plane.

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

In this embodiment, the filter and/or cover glass C located between the eighth lens L8 and the imaging plane has an object side surface S18 and an image side surface S19. Light from the object passes sequentially through the respective surfaces S1 to S19 and is finally imaged on an imaging plane, where an image sensing chip IMA may be provided. Table 9 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the optical lens of example 5.

TABLE 9

In this embodiment, the object-side surfaces and the image-side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the sixth lens element L6, the seventh lens element L7, and the eighth lens element L8 are aspherical surfaces, and each aspherical surface type can be defined by the formula (1) given in embodiment 1. Table 10 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S1 to S4, S6, S7 and S12 to S17 used in this example ₄ 、A ₆ 、A ₈ 、A ₁₀ And A ₁₂ 。

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

Table 10

In summary, examples 1 to 5 satisfy the relationships shown in table 11 below, respectively.

TABLE 11

The application also provides an electronic device, which can comprise the optical lens and the imaging element for converting an optical image formed by the optical lens into an electric signal.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. An optical lens, comprising, in order from an object side to an image side along an optical axis:

a first lens having negative optical power;

the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;

a fourth lens having optical power;

a fifth lens with optical power, wherein the optical power of the fifth lens is positive and negative opposite to the optical power of the fourth lens;

a sixth lens having negative optical power;

a seventh lens having positive optical power; and

an eighth lens having a negative optical power,

the optical lens satisfies the following conditions:

1.5≤f3/f≤2.6，

wherein f3 is the effective focal length of the third lens, and f is the total effective focal length of the optical lens.

2. The optical lens of claim 1, wherein,

the image side surface of the first lens is a concave surface;

the object side surface of the fourth lens is a convex surface;

the image side surface of the fifth lens is a convex surface;

the object side surface of the sixth lens is a concave surface, and the image side surface is a concave surface;

the image side surface of the seventh lens is a convex surface; and

the object side surface of the eighth lens is a convex surface, and the image side surface is a concave surface.

3. The optical lens according to claim 1 or 2, wherein an effective focal length f1 of the first lens and a total effective focal length f of the optical lens satisfy: -2.0.ltoreq.f1/f.ltoreq.1.0.

4. The optical lens according to claim 1 or 2, wherein an effective focal length f2 of the second lens and a total effective focal length f of the optical lens satisfy: -f 2/f is 7.2 or less and 6.0 or less.

5. The optical lens according to claim 1 or 2, wherein the total effective focal length f of the optical lens satisfies the following with the radius of curvature R21 of the object side surface of the second lens and the radius of curvature R22 of the image side surface of the second lens: f/R21+fR22 is more than or equal to 1.0 and less than or equal to 2.0.

6. The optical lens according to claim 1 or 2, wherein an effective focal length f4 of the fourth lens and an effective focal length f5 of the fifth lens satisfy: -f 4/f5 is less than or equal to 5.0 and less than or equal to 0.

7. The optical lens according to claim 1 or 2, wherein an effective focal length f6 of the sixth lens and a total effective focal length f of the optical lens satisfy: -3.2.ltoreq.f6/f.ltoreq.1.2.

8. The optical lens according to claim 1 or 2, wherein an effective focal length f7 of the seventh lens and a total effective focal length f of the optical lens satisfy: f7/f is more than or equal to 1.2 and less than or equal to 2.5.

9. The optical lens according to claim 1 or 2, wherein an effective focal length f8 of the eighth lens and a total effective focal length f of the optical lens satisfy: -11.2.ltoreq.f8/f.ltoreq.1.8.

10. The optical lens according to claim 1 or 2, wherein a combined focal length f45 of the fourth lens and the fifth lens and an effective focal length f8 of the eighth lens satisfy: -1.1.ltoreq.f45/f8.ltoreq.0.

11. The optical lens according to claim 1 or 2, wherein the abbe number Vd4 of the fourth lens and the abbe number Vd5 of the fifth lens satisfy: vd4/Vd5 is more than or equal to 0.1 and less than or equal to 3.0.

12. The optical lens according to claim 1 or 2, wherein a radius of curvature R12 of an image side of the first lens and a radius of curvature R21 of an object side of the second lens satisfy: -0.7 < R12-R21)/(R12+R21) < 0.1.

13. The optical lens according to claim 1 or 2, wherein a center thickness T2 of the second lens on the optical axis and a distance TTL from a center of an object side surface of the first lens to an imaging surface of the optical lens on the optical axis satisfy: T2/TTL is more than or equal to 0 and less than or equal to 0.2.

14. The optical lens according to claim 1 or 2, further comprising a diaphragm, a distance Ds between the diaphragm and the third lens on the optical axis and a distance TTL between a center of an object side surface of the first lens and an imaging surface of the optical lens on the optical axis are satisfied: ds/TTL is more than or equal to 0 and less than or equal to 0.1.

15. The optical lens according to claim 1 or 2, characterized in that the total effective focal length f of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: f/ENPD is more than or equal to 1.9 and less than or equal to 2.6.

16. The optical lens according to claim 1 or 2, wherein a distance BFL on the optical axis from a center of an image side surface of the eighth lens to an imaging surface of the optical lens and a total effective focal length f of the optical lens satisfy: BFL/f is more than or equal to 0.4 and less than or equal to 0.8.

17. The optical lens according to claim 1 or 2, wherein a total effective focal length f of the optical lens and a distance TTL from a center of an object side surface of the first lens to an imaging surface of the optical lens on the optical axis satisfy: f/TTL is more than or equal to 0.1 and less than or equal to 0.5.

18. The optical lens according to claim 1 or 2, wherein a maximum field angle FOV of the optical lens, a maximum light passing aperture D of an object side surface of the first lens corresponding to the maximum field angle of the optical lens, and an image height H corresponding to the maximum field angle of the optical lens satisfy: 1.0.ltoreq.D.times.180°)/(H.times.FOV.ltoreq.2.0.

19. The optical lens according to claim 1 or 2, wherein a distance TTL from a center of an object side surface of the first lens to an imaging surface of the optical lens on the optical axis corresponds to an image height H of a maximum field angle of the optical lens, which satisfies: TTL/H is less than or equal to 1.6 and less than or equal to 2.2.

20. The optical lens according to claim 1 or 2, wherein an image height H of the total effective focal length f of the optical lens corresponding to a maximum field angle of the optical lens satisfies: f/H is more than or equal to 0.2 and less than or equal to 0.7.

21. The optical lens according to claim 1 or 2, wherein a distance TTL from a center of an object side surface of the first lens to an imaging surface of the optical lens on the optical axis, an image height H of a maximum field angle FOV of the optical lens corresponding to the maximum field angle of the optical lens, satisfies: 2.7.ltoreq.TTL.times.180°)/(H.times.FOV.ltoreq.3.6.