CN116068723A

CN116068723A - Optical lens and electronic device

Info

Publication number: CN116068723A
Application number: CN202111296461.4A
Authority: CN
Inventors: 郎海涛; 朱军强; 袁迪; 杨佳; 张鹤腾; 顾菲; 何方健
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2023-05-05

Abstract

The invention provides an optical lens and an electronic device. The optical lens comprises a first lens with negative focal power, wherein a first side surface of the first lens is a convex surface, and a second side surface of the first lens is a concave surface; the second lens has negative focal power, the first side surface of the second lens is a concave surface, and the second side surface of the second lens is a concave surface; the third lens has positive focal power, the first side surface of the third lens is a convex surface, and the second side surface of the third lens is a convex surface; the fourth lens has positive focal power, and at least one surface of the first side surface and the second side surface of the fourth lens is a convex surface; the fifth lens has negative focal power; the sixth lens has positive optical power; the seventh lens has positive focal power, the first side surface of the seventh lens is a convex surface, and the second side surface of the seventh lens is a convex surface; the eighth lens has positive optical power. The invention solves the problems of miniaturization, small caliber, high resolution, small distortion, small telecentricity, small FNO and good temperature performance of the optical lens in the prior art, and is difficult to consider simultaneously.

Description

Optical lens and electronic device

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an optical lens and electronic equipment.

Background

With the development of science and technology, more and more fields need to use optical lenses to serve as "eyes", such as in-vehicle, monitoring, projection, industrial fields, and the like. As the demand increases and technology develops, there is a growing variety of demands on the performance of optical lenses. The types of optical lenses are various, taking a projection optical lens as an example, the projection optical lens is also called a projection objective lens, a chip surface for imaging display is generally called an object plane, the object plane is positioned on the right side of the projection optical lens, the projection plane is called an image plane, and the image plane is positioned on the left side of the projection optical lens; with the improvement of imaging unit pixels and the improvement of projection effects, a simple projection system cannot meet the requirement of higher imaging performance.

In the prior art, an optical lens is provided, which cannot meet the requirements of small front and rear port diameters and miniaturization. The prior art provides another optical lens which, although satisfying the demand for miniaturization, is unable to satisfy the demand for high resolution. The prior art provides another optical lens with a large distortion, which cannot meet the requirement of small distortion. The prior art provides another optical lens, which has larger FNO, has weak light transmission capability and can not provide higher luminous flux under the same illumination light source.

That is, the optical lens in the prior art has the problems of miniaturization, small caliber, high resolution, small distortion, small telecentricity, small FNO and good temperature performance which are difficult to be simultaneously considered.

Disclosure of Invention

The invention mainly aims to provide an optical lens and electronic equipment, which are used for solving the problems that the optical lens in the prior art is miniaturized, small in caliber, high in resolution, small in distortion, small in telecentricity, small in FNO and good in temperature performance and is difficult to consider.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical lens comprising, in order from an image side to an object side along an optical axis: the first lens is provided with negative focal power, the first side surface of the first lens is a convex surface, and the second side surface of the first lens is a concave surface; the second lens is provided with negative focal power, the first side surface of the second lens is a concave surface, and the second side surface of the second lens is a concave surface; the first side surface of the first lens is a convex surface, and the second side surface of the first lens is a convex surface; a fourth lens having positive optical power, at least one of a first side surface and a second side surface of the fourth lens being convex; a fifth lens having negative optical power, at least one of the first side and the second side of the fifth lens being concave; a sixth lens having positive optical power, at least one of a first side surface and a second side surface of the sixth lens being convex; a seventh lens having positive optical power, a first side of the seventh lens being convex, a second side of the seventh lens being convex; and an eighth lens having positive optical power, at least one of the first side and the second side of the eighth lens being convex.

Further, the first side of the fourth lens is concave, and the second side of the fourth lens is convex.

Further, the first side of the fourth lens is convex, and the second side of the fourth lens is convex.

Further, the first side of the fifth lens is a concave surface, and the second side of the fifth lens is a concave surface.

Further, the first side of the fifth lens is concave, and the second side of the fifth lens is convex.

Further, the first side of the sixth lens is convex, and the second side of the sixth lens is convex.

Further, the first side of the sixth lens is concave, and the second side of the sixth lens is convex.

Further, the first side of the eighth lens is concave, and the second side of the eighth lens is convex.

Further, the first side of the eighth lens is convex, and the second side of the eighth lens is convex.

Further, the optical lens further comprises a diaphragm, and the diaphragm is arranged between the fourth lens and the fifth lens.

Further, the fifth lens and the sixth lens are cemented to form a cemented lens.

Further, the first lens and/or the seventh lens are aspherical lenses.

Further, the first lens and/or the eighth lens are aspherical lenses.

Further, the image distance of the optical lens, that is, the center distance d from the image surface to the first side surface of the first lens of the optical lens and the image height H corresponding to the maximum field angle of the optical lens, satisfy: d/H is less than or equal to 2.5.

Further, the total optical length of the optical lens, that is, the center distance TTL from the center of the image side of the first lens of the optical lens to the object plane of the optical lens, and the focal length F of the entire group of the optical lens satisfy: TTL/F is less than or equal to 6.5.

Further, the focal length value F4 of the fourth lens and the focal length value F5 of the fifth lens satisfy: the content of F4/F5 is less than or equal to 3.5.

Further, between the maximum value dn of the thicknesses in the fifth, sixth, seventh and eighth lenses and the minimum value dm of the thicknesses in the fifth, sixth, seventh and eighth lenses, it is satisfied that: and dn/dm is more than or equal to 0.3 and less than or equal to 4.2.

Further, the optical back focal length of the optical lens, that is, the center distance BFL from the object side center of the eighth lens of the optical lens to the object plane, and the lens group length of the optical lens, that is, the distance TL from the image side center of the first lens of the optical lens to the object side center of the eighth lens of the optical lens, satisfy: BFL/TL is greater than or equal to 0.2.

Further, the center distance d2 between the first lens and the second lens and the total optical length of the optical lens, that is, the center distance TTL between the center of the image side of the first lens of the optical lens and the object plane of the optical lens, satisfy: d2/TTL is more than or equal to 0.015.

Further, the Sg value Sag (S1) corresponding to the maximum light transmission aperture of the first side surface of the first lens and the Sg value Sag (S2) corresponding to the maximum light transmission aperture of the second side surface of the first lens satisfy: sag (S1)/Sag (S2) is less than or equal to 1.

Further, the Sg value Sag (S3) corresponding to the maximum light transmission aperture of the first side surface of the second lens and the Sg value Sag (S4) corresponding to the maximum light transmission aperture of the second side surface of the second lens satisfy: and the absolute value of Sag (S3)/Sag (S4) is more than or equal to 0.3 and less than or equal to 2.

Further, the maximum aperture D1 of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: D1/H/FOV is less than or equal to 0.12.

Further, the optical back focal length of the optical lens, that is, the center distance BFL from the object side center of the eighth lens of the optical lens to the object plane, and the optical total length of the optical lens, that is, the center distance TTL from the image side center of the first lens of the optical lens to the object plane of the optical lens, satisfy: BFL/TTL is more than or equal to 0.15.

Further, the whole set of focal length values F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F/ENPD is more than or equal to 1.0 and less than or equal to 4.

Further, the Sg value Sag (S13) corresponding to the maximum light transmission aperture of the first side surface of the seventh lens and the Sg value Sag (S14) corresponding to the maximum light transmission aperture of the second side surface of the seventh lens satisfy: 0.2 is less than or equal to |SAG (S13)/SAG (S14) is less than or equal to 2.

Further, the focal length value F7 of the seventh lens and the focal length value F8 of the eighth lens satisfy: the I F7/F8I is less than or equal to 3.

Further, the total optical length of the optical lens, that is, the center distance TTL from the center of the image side of the first lens of the optical lens to the object plane of the optical lens, and the maximum light-transmitting aperture D1 of the first side of the first lens corresponding to the maximum field angle of the optical lens, satisfy: TTL/D1 is more than or equal to 2.8.

Further, the total optical length of the optical lens, that is, the center distance TTL from the center of the image side of the first lens element to the object plane of the optical lens element and the maximum light-transmitting aperture D2 of the second side of the eighth lens element corresponding to the maximum field angle of the optical lens element, satisfy: TTL/D2 is more than or equal to 2.8.

Further, the following are satisfied between the entire set of focal length values F of the optical lens and the exit pupil position EXPP of the entire set of focal length values of the optical lens with respect to the object plane: the F/EXPP is less than or equal to 0.5.

Further, the image height H corresponding to the maximum field angle of the optical lens, the whole set of focal length values F of the optical lens, and the radian θ of the maximum field angle of the optical lens satisfy: and (H-F.theta)/(F.theta). Ltoreq.1.5.

According to another aspect of the present invention, there is provided an optical lens comprising, in order from an image side to an object side along an optical axis: a first lens having negative optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having positive optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; an eighth lens having positive optical power; the maximum aperture D1 of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: D1/H/FOV is less than or equal to 0.12.

Further, the first side of the first lens is convex, and the second side of the first lens is concave.

Further, the first side of the second lens is concave, and the second side of the second lens is concave.

Further, the first side of the third lens is convex, and the second side of the third lens is convex.

Further, the first side of the seventh lens is convex, and the second side of the seventh lens is convex.

Further, the first lens and/or the seventh lens are aspherical lenses.

Further, the first lens and/or the eighth lens are aspherical lenses.

According to another aspect of the present invention, there is provided an electronic device including the above-described optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

By applying the technical scheme of the invention, the optical lens sequentially comprises 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 from an image side to an object side along an optical axis, wherein the first lens has negative focal power, a first side surface of the first lens is a convex surface, and a second side surface of the first lens is a concave surface; the second lens has negative focal power, the first side surface of the second lens is a concave surface, and the second side surface of the second lens is a concave surface; the third lens has positive focal power, the first side surface of the third lens is a convex surface, and the second side surface of the third lens is a convex surface; the fourth lens has positive focal power, and at least one surface of the first side surface and the second side surface of the fourth lens is a convex surface; the fifth lens has negative focal power, and at least one surface of the first side surface and the second side surface of the fifth lens is a concave surface; the sixth lens has positive focal power, and at least one surface of the first side surface and the second side surface of the sixth lens is a convex surface; the seventh lens has positive focal power, the first side surface of the seventh lens is a convex surface, and the second side surface of the seventh lens is a convex surface; the eighth lens has positive optical power, and at least one of the first side surface and the second side surface of the eighth lens is convex.

The first lens has negative focal power, the first side surface of the first lens is a convex surface, and the second side surface of the first lens is a concave surface. The first lens is preferably an aspheric lens and has negative focal power, which is beneficial to the first lens to adjust the angle of light, so that the trend of the light is smoothly transited to a rear system, and meanwhile, the distortion of the system is favorably corrected, and small distortion is ensured; the first side surface of the first lens is a convex surface, which is beneficial to the application in the outdoor environment and the sliding of water drops and dust.

The second lens has negative focal power, the first side surface of the second lens is a concave surface, and the second side surface of the second lens is a concave surface. The second lens has negative focal power, so that the second lens further diverges light rays, and the deflection angle of the light rays is adjusted, thereby being beneficial to reducing chromatic aberration.

The third lens has positive focal power, the first side surface of the third lens is a convex surface, and the second side surface of the third lens is a convex surface. The third lens has positive focal power, gathers light, adjusts light, and makes light trend steadily transition to the rear optical system.

The fourth lens has positive focal power, and at least one of the first side surface and the second side surface of the fourth lens is convex. When the first side surface of the fourth lens is a concave surface and the second side surface of the fourth lens is a convex surface, the fourth lens has positive focal power, light rays are converged, and the light rays are adjusted so that the light rays move to the rear smoothly. When the first side surface of the fourth lens is a convex surface, the second side surface of the fourth lens is a convex surface, the fourth lens has positive focal power, light rays are converged, the light rays are adjusted, the trend of the light rays is smoothly transited to the rear, the shape of the fourth lens is biconvex, the optical refraction angle is relieved, and therefore the sensitivity of the system is reduced.

The fifth lens has negative focal power, and at least one of the first side surface and the second side surface of the fifth lens is concave. When the first side surface of the fifth lens is a concave surface and the second side surface of the fifth lens is a concave surface, the fifth lens has negative focal power, the shape of the fifth lens is biconcave, and the fifth lens is matched with the sixth lens with biconvex positive focal power at the back, so that chromatic aberration can be corrected, and the sensitivity of the system can be reduced. When the first side surface of the fifth lens is concave, and the second side surface of the fifth lens is convex, the fifth lens has negative focal power, is concave-convex in shape, is matched with the sixth lens with concave-convex positive focal power at the back, is favorable for correcting chromatic aberration, and can reduce the caliber of the system.

The sixth lens has positive optical power, and at least one of the first side surface and the second side surface of the sixth lens is convex. When the first side surface of the sixth lens is a convex surface, the second side surface of the sixth lens is a convex surface, and the sixth lens has positive focal power, and is matched with the fifth lens with the biconcave negative focal power, so that chromatic aberration can be corrected. When the first side surface of the sixth lens is concave and the second side surface of the sixth lens is convex, the sixth lens has positive focal power, and is matched with the fifth lens with the front concave-convex negative focal power, so that chromatic aberration can be corrected.

The seventh lens has positive focal power, the first side of the seventh lens is a convex surface, and the second side of the seventh lens is a convex surface. The seventh lens is preferably an aspheric lens, and the seventh lens has positive focal power, so that the telecentricity of the system is optimized, the distortion of the system is corrected, the system is made to be an object telecentric system, and the rear end diameter of the system can be reduced by the seventh lens preferably the aspheric lens.

The eighth lens has positive optical power, and at least one of the first side surface and the second side surface of the eighth lens is convex. When the first side surface of the eighth lens is concave and the second side surface of the eighth lens is convex, the eighth lens has positive focal power, and the telecentricity of the system is optimized, so that the system is an object-side telecentric system. When the first side surface of the eighth lens is a convex surface and the second side surface of the eighth lens is a convex surface, the shape of the eighth lens is biconvex, so that the light trend is smoothly transited to the rear, and the sensitivity of the system is reduced. The eighth lens is preferably an aspherical lens and has positive focal power, and the aspherical lens is arranged at the rearmost position of the optical system, and the distance from the diaphragm can better optimize the telecentricity of the system and correct the distortion of the system.

In addition, the optical lens can be an object side telecentric projection lens, and the object side telecentric projection lens with low chromatic aberration, small distortion, high resolution and small caliber is realized. The optical lens has the characteristics of miniaturization, small caliber, high resolution, small distortion object space telecentric design, small telecentricity, small F.NO, better temperature performance and better imaging quality in a high-low temperature environment. The optical lens is of an all-glass design, can be used in a severe environment and has good optical performance.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 is a schematic view showing the structure of an optical lens according to an example one of the present invention;

FIG. 2 is a schematic diagram showing an optical lens according to a second example of the present invention;

FIG. 3 is a schematic view showing the structure of an optical lens according to a third example of the present invention;

fig. 4 is a schematic view showing the structure of an optical lens of example four of the present invention;

fig. 5 is a schematic view showing the structure of an optical lens of example five of the present invention;

fig. 6 is a schematic view showing the structure of an optical lens of example six of the present invention;

fig. 7 is a schematic view showing the structure of an optical lens of example seven of the present invention;

fig. 8 shows a schematic structural diagram of an optical lens of example eight of the present invention.

Wherein the above figures include the following reference numerals:

l1, a first lens; s1, a first side surface of a first lens; s2, a second side surface of the first lens; l2, a second lens; s3, a first side surface of the second lens; s4, a second side surface of the second lens; l3, a third lens; s5, a first side surface of the third lens; s6, a second side surface of the third lens; l4, a fourth lens; s7, a first side surface of the fourth lens; s8, a second side surface of the fourth lens; STO and diaphragm; l5, a fifth lens; s10, a first side surface of the fifth lens; s11, a second side surface of the fifth lens; l6, sixth lens; s11, a first side surface of the sixth lens; s12, a second side surface of the sixth lens; l7, seventh lens; s13, a first side surface of the seventh lens; s14, a second side surface of the seventh lens; l8, eighth lens; s15, a first side surface of the eighth lens; s16, a second side surface of the eighth lens; l9, an optical filter; s17, a first side surface of the optical filter; s18, a second side surface of the optical filter; l10, first protective glass; s19, a first side surface of the first protective glass; s20, a second side surface of the first protective glass; l11, second protective glass; s21, a first side surface of the second protective glass; s22, a second side surface of the second protective glass; l12, third protective glass; OBJ, object plane.

Detailed Description

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 invention will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that all 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 unless otherwise indicated.

In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.

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. Specifically, 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 close to the object side becomes the first side of the lens, and the surface of each lens close to the image side is called the second side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). The first side face is determined to be convex when the R value is positive, and is determined to be concave when the R value is negative; the second side face is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

In the present application, the leftmost side of the optical lens has an image plane, and the rightmost side of the optical lens has an object plane.

In an exemplary embodiment, the optical lens provided herein may be used as, for example, an in-vehicle lens. At this time, the left side is the image side, and the right side is the object side. The first side is the image side, the second side is the object side, the first side of the optical lens is the image plane of the optical lens, and the second side of the optical lens is the object plane of the optical lens.

In an exemplary embodiment, the optical lens provided herein may be used as, for example, a projection lens or a lidar transmitting end lens.

The invention provides an optical lens and electronic equipment, which are used for solving the problems that the optical lens in the prior art is miniaturized, small in caliber, high in resolution, small in distortion, small in telecentricity, small in FNO and good in temperature performance and are difficult to consider simultaneously.

Example 1

As shown in fig. 1 to 8, the optical lens sequentially includes, from an image side to an object side along an optical axis, 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, wherein the first lens has negative focal power, a first side surface of the first lens is a convex surface, and a second side surface of the first lens is a concave surface; the second lens has negative focal power, the first side surface of the second lens is a concave surface, and the second side surface of the second lens is a concave surface; the third lens has positive focal power, the first side surface of the third lens is a convex surface, and the second side surface of the third lens is a convex surface; the fourth lens has positive focal power, and at least one surface of the first side surface and the second side surface of the fourth lens is a convex surface; the fifth lens has negative focal power, and at least one surface of the first side surface and the second side surface of the fifth lens is a concave surface; the sixth lens has positive focal power, and at least one surface of the first side surface and the second side surface of the sixth lens is a convex surface; the seventh lens has positive focal power, the first side surface of the seventh lens is a convex surface, and the second side surface of the seventh lens is a convex surface; the eighth lens has positive optical power, and at least one of the first side surface and the second side surface of the eighth lens is convex.

In this embodiment, the first side of the fourth lens is concave, and the second side of the fourth lens is convex. The fourth lens has positive focal power, gathers light, adjusts light, and makes light trend steadily transition to the rear.

In this embodiment, the first side of the fourth lens is convex, and the second side of the fourth lens is convex. The fourth lens has positive focal power, gathers light, adjusts light, makes light trend steadily transition to the rear, and the fourth lens shape is biconvex, alleviates optics refraction angle to reduce the system sensitivity.

In this embodiment, the first side of the fifth lens is concave, and the second side of the fifth lens is concave. The fifth lens has negative focal power, the shape of the fifth lens is biconcave, and the fifth lens is matched with the sixth lens with biconvex positive focal power at the back, so that chromatic aberration can be corrected, and the sensitivity of the system can be reduced.

In this embodiment, the first side of the fifth lens is concave, and the second side of the fifth lens is convex. The fifth lens has negative focal power, is concave-convex in shape, is matched with the sixth lens with the concave-convex positive focal power at the back, is favorable for correcting chromatic aberration, and can reduce the caliber of the system.

In this embodiment, the first side of the sixth lens is convex, and the second side of the sixth lens is convex. The sixth lens has positive focal power, and is matched with the fifth lens with the front biconcave negative focal power, so that chromatic aberration can be corrected.

In this embodiment, the first side of the sixth lens is concave, and the second side of the sixth lens is convex. The sixth lens has positive focal power, and is matched with the fifth lens with the front concave-convex negative focal power, so that chromatic aberration can be corrected.

In this embodiment, the first side of the eighth lens is concave, and the second side of the eighth lens is convex. The eighth lens has positive focal power, and the telecentricity of the system is optimized, so that the system is an object space telecentric system.

In this embodiment, the first side of the eighth lens is convex, and the second side of the eighth lens is convex. The eighth lens is biconvex, so that the light trend is smoothly transited to the rear, and the sensitivity of the system is reduced. The eighth lens is preferably an aspherical lens and has positive focal power, and the aspherical lens is arranged at the rearmost position of the optical system, and the distance from the diaphragm can better optimize the telecentricity of the system and correct the distortion of the system.

In this embodiment, the optical lens further includes a diaphragm disposed between the fourth lens and the fifth lens. The diaphragm is placed in the middle of the system, so that the effective beam collection of light entering the optical system is facilitated, the aperture of lenses at two ends of the optical system is reduced, the telecentricity of the optical lens is adjusted, and the assembly sensitivity of the system is reduced.

In this embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens. The use of the cemented lens can effectively eliminate the influence of ghost images on the optical lens, and is beneficial to correcting chromatic aberration, so that the optical lens ensures higher resolving power on the basis of eliminating ghost images. The negative lens of the cemented lens has higher refractive index relative to the positive lens, so that the light can be effectively and stably converged at last, the light can stably reach the object plane, and the overall weight and cost are reduced. The arrangement of the cemented lens can also reduce the light quantity loss caused by reflection between lenses; through the collocation of high low refractive index, be favorable to the fast transition of place ahead light, increase the diaphragm bore, promote the light quantity, help night vision demand. And the adoption of the cemented lens reduces the air interval between the fifth lens and the sixth lens, so that the whole structure of the optical system is more compact, and meanwhile, the problem of tolerance sensitivity of the lens unit due to whole eccentric core and the like generated in the assembling process is solved.

In this embodiment, the first lens and the seventh lens are aspherical lenses. By reasonably arranging the aspheric lens, the field distortion can be corrected, the resolution can be improved, and the telecentricity can be optimized.

In this embodiment, the first lens and the eighth lens are aspherical lenses. By reasonably arranging the aspheric lens, the field distortion can be corrected, the resolution can be improved, and the telecentricity can be optimized.

In this embodiment, the image distance of the optical lens, that is, the center distance d between the image plane and the first side of the first lens of the optical lens and the image height H corresponding to the maximum field angle of the optical lens, satisfy: d/H is less than or equal to 2.5. The ratio of the image distance d of the optical lens to the image height H corresponding to the maximum field angle of the optical lens is reasonably restrained, the ratio is equal to the maximum field angle FOV of the restrained optical lens, the smaller the ratio is, the larger the FOV is represented, the larger projection picture of the optical lens is ensured, and the projection distance is shortened. Preferably, d/H.ltoreq.2.0.

In this embodiment, the total optical length of the optical lens, that is, the center distance TTL between the center of the image side of the first lens of the optical lens and the object plane of the optical lens, and the entire set of focal length values F of the optical lens satisfy: TTL/F is less than or equal to 6.5. The condition is satisfied, so that the optical lens has better performance and simultaneously satisfies miniaturization. Preferably, TTL/F is 6.2 or less.

In the present embodiment, the focal length value F4 of the fourth lens and the focal length value F5 of the fifth lens satisfy: the content of F4/F5 is less than or equal to 3.5. The focal lengths of the fifth lens and the fourth lens are similar due to the fact that the conditional expression is met, smooth and excessive light rays are facilitated, and improvement of image quality is facilitated. Preferably, |F4/F5|is less than or equal to 3.

In the present embodiment, the maximum value dn of the thicknesses in the fifth lens, the sixth lens, the seventh lens, and the eighth lens and the minimum value dm of the thicknesses in the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy: and dn/dm is more than or equal to 0.3 and less than or equal to 4.2. The center thickness of the lenses in the fifth lens to the eighth lens is close to the center thickness of the lenses in the fifth lens to the eighth lens by meeting the conditional expression, so that the light deflection change of the whole optical lens at high and low temperatures is small, and the temperature performance is good. Preferably, 0.5.ltoreq.dn/dm.ltoreq.4.

In this embodiment, the optical back focal length of the optical lens, that is, the center distance BFL from the object side center of the eighth lens of the optical lens to the object plane, and the lens group length of the optical lens, that is, the distance TL from the image side center of the first lens of the optical lens to the object side center of the eighth lens of the optical lens, satisfy: BFL/TL is greater than or equal to 0.2. The method meets the condition, ensures the back focal length on the basis of realizing miniaturization, and is beneficial to the assembly of the module; meanwhile, the TL is short, so that the overall compact structure of the optical lens is guaranteed, the sensitivity of the lens to MTF is reduced, the production yield is improved, and the production cost is reduced. Preferably, BFL/TL is ≡0.25.

In this embodiment, the center distance d2 between the first lens and the second lens and the total optical length of the optical lens, that is, the center distance TTL between the center of the image side of the first lens of the optical lens and the object plane of the optical lens, satisfy: d2/TTL is more than or equal to 0.015. The conditional expression is satisfied, so that the center distance between the first lens and the second lens is larger, light rays near the diaphragm are smoothly transited, and the improvement of image quality is facilitated. Preferably, d2/TTL is ≡0.02.

In this embodiment, the Sg value Sag (S1) corresponding to the maximum light-transmitting aperture of the first side surface of the first lens and the Sg value Sag (S2) corresponding to the maximum light-transmitting aperture of the second side surface of the first lens satisfy: sag (S1)/Sag (S2) is less than or equal to 1. The conditional expression is satisfied, so that the sagittal height difference between the first side surface and the second side surface of the first lens is ensured to be larger, and the collection of light rays is facilitated. Preferably, |Sag (S1)/Sag (S2) | is less than or equal to 0.9.

In this embodiment, the Sg value Sag (S3) corresponding to the maximum light-transmitting aperture of the first side surface of the second lens and the Sg value Sag (S4) corresponding to the maximum light-transmitting aperture of the second side surface of the second lens satisfy: and the absolute value of Sag (S3)/Sag (S4) is more than or equal to 0.3 and less than or equal to 2. The first side face and the second side face of the second lens are guaranteed to be relatively close in shape and smooth in transition of peripheral light rays, and sensitivity of the lens is reduced. Preferably, 0.45.ltoreq.Sag (S3)/Sag (S4). Ltoreq.1.5.

In this embodiment, the maximum light passing aperture D1 of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: D1/H/FOV is less than or equal to 0.12. The front end opening of the optical lens is ensured to be small when the condition is satisfied, and the miniaturization is facilitated. Preferably, D1/H/FOV is less than or equal to 0.08.

In this embodiment, the optical back focal length of the optical lens, that is, the center distance BFL from the object side center of the eighth lens of the optical lens to the object plane, and the optical total length of the optical lens, that is, the center distance TTL from the image side center of the first lens of the optical lens to the object plane of the optical lens, satisfy: BFL/TTL is more than or equal to 0.15. The special requirement of the back focal length of the optical lens is met, and a space can be reserved for the installation and focusing of optical elements, so that interference among mechanisms is avoided. Preferably, BFL/TTL is greater than or equal to 0.2.

In the present embodiment, the overall group focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F/ENPD is more than or equal to 1.0 and less than or equal to 4. The condition is satisfied, the small FNO is ensured, and the increase of the light quantity is facilitated. Preferably, 1.2.ltoreq.F/ENPD.ltoreq.3.

In this embodiment, the Sg value Sag (S13) corresponding to the maximum light transmission aperture of the first side surface of the seventh lens and the Sg value Sag (S14) corresponding to the maximum light transmission aperture of the second side surface of the seventh lens satisfy: 0.2 is less than or equal to |SAG (S13)/SAG (S14) is less than or equal to 2. The first side surface and the second side surface of the seventh lens are close to each other in shape and are beneficial to gentle and excessive peripheral light rays and beneficial to reducing the sensitivity of the lens. Preferably, 0.35.ltoreq.I SAG (S13)/SAG (S14) |.ltoreq.1.5.

In the present embodiment, the focal length value F7 of the seventh lens and the focal length value F8 of the eighth lens satisfy: the I F7/F8I is less than or equal to 3. The condition is satisfied, the focal lengths of the seventh lens and the eighth lens are guaranteed to be similar, smooth and excessive light rays are facilitated, and image quality is improved. Preferably, |F7/F8|is less than or equal to 2.

In this embodiment, the total optical length of the optical lens, that is, the center distance TTL from the center of the image side of the first lens of the optical lens to the object plane of the optical lens, and the maximum light transmission aperture D1 of the first side of the first lens corresponding to the maximum field angle of the optical lens satisfy: TTL/D1 is more than or equal to 2.8. The front end port of the optical lens is ensured to be small by meeting the condition, and miniaturization can be realized. Preferably, TTL/D1 is 3.2 or more.

In this embodiment, the total optical length of the optical lens, that is, the center distance TTL from the center of the image side of the first lens element to the object plane of the optical lens element and the maximum light-transmitting aperture D2 of the second side of the eighth lens element corresponding to the maximum field angle of the optical lens element, satisfy: TTL/D2 is more than or equal to 2.8. The condition is satisfied, the rear end diameter of the optical lens is ensured to be small, and miniaturization can be realized. Preferably, TTL/D2 is 3.2 or more.

In this embodiment, the following conditions are satisfied between the entire set of focal length values F of the optical lens and the exit pupil position EXPP of the entire set of focal length values of the optical lens with respect to the object plane: the F/EXPP is less than or equal to 0.5. The conditional expression is satisfied, the telecentricity is ensured to be small, and the telecentricity of an image space can be realized. Preferably, |F/EXPP|is less than or equal to 0.3.

In this embodiment, the image height H corresponding to the maximum field angle of the optical lens, the overall focal length F of the optical lens, and the radian θ of the maximum field angle of the optical lens satisfy: and (H-F.theta)/(F.theta). Ltoreq.1.5. The condition is satisfied, and the imaging effect of the central area of the object plane of the optical lens is highlighted by increasing the focal length of the optical lens under the condition that the maximum field angle and the imaging surface size of the optical lens are unchanged. Preferably, | (H-F. Theta.)/(F. Theta.) | is less than or equal to 1.2.

Example two

As shown in fig. 1 to 8, the optical lens sequentially includes, from an image side to an object side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a first lens having negative optical power; the second lens has negative focal power; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has negative focal power; the sixth lens has positive optical power; the seventh lens has positive optical power; the eighth lens has positive optical power; the maximum aperture D1 of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: D1/H/FOV is less than or equal to 0.12. The front end opening of the optical lens is ensured to be small when the condition is satisfied, and the miniaturization is facilitated. Preferably, D1/H/FOV is less than or equal to 0.08.

In this embodiment, the first side of the first lens is convex, and the second side of the first lens is concave. The first lens is preferably an aspheric lens and has negative focal power, which is beneficial to the first lens to adjust the angle of light, so that the trend of the light is smoothly transited to a rear system, and meanwhile, the distortion of the system is favorably corrected, and small distortion is ensured; the first side surface of the first lens is a convex surface, which is beneficial to the application in the outdoor environment and the sliding of water drops and dust.

In this embodiment, the first side of the second lens is concave, and the second side of the second lens is concave. The second lens has negative focal power, so that the second lens further diverges light rays, and the deflection angle of the light rays is adjusted, thereby being beneficial to reducing chromatic aberration.

In this embodiment, the first side of the third lens is convex, and the second side of the third lens is convex. The third lens has positive focal power, gathers light, adjusts light, and makes light trend steadily transition to the rear optical system.

In this embodiment, the first side of the seventh lens is convex, and the second side of the seventh lens is convex. The seventh lens is preferably an aspheric lens, and the seventh lens has positive focal power, so that the telecentricity of the system is optimized, the distortion of the system is corrected, the system is made to be an object telecentric system, and the rear end diameter of the system can be reduced by the seventh lens preferably the aspheric lens.

In this embodiment, the optical lens further includes a stop disposed between the fourth lens and the fifth lens, or between the third lens and the fourth lens. The diaphragm is placed in the middle of the system, so that the effective beam collection of light entering the optical system is facilitated, the aperture of lenses at two ends of the optical system is reduced, the telecentricity of the optical lens is adjusted, and the assembly sensitivity of the system is reduced.

Optionally, the optical lens may further include a filter for correcting color deviation and a protective glass for protecting the photosensitive element located on the object plane.

The optical lens in the present application may employ a plurality of lenses, for example, the eight lenses described above. The present application is not particularly limited to the specific number of spherical lenses and aspherical lenses, and the number of aspherical lenses may be increased when focusing on the imaging quality. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

In an exemplary embodiment, the present solution is not limited to the plastic and glass of the lens, and the first, second, third, fourth, fifth, sixth, seventh and eighth lenses may be glass lenses, if focus is placed on temperature performance. The optical lens made of glass can inhibit the shift of the back focus of the optical lens along with the change of temperature, so as to improve the stability of the system. Meanwhile, the glass material can avoid the influence on the normal use of the optical lens due to the imaging blurring of the lens caused by the high and low temperature change in the use environment. For example, the temperature range of the optical lens with the full glass design is wider, and the stable optical performance can be kept within the range of-40 ℃ to 105 ℃. Specifically, when the image quality and reliability are emphasized, the first lens to the eighth lens may be glass aspherical lenses. Of course, in applications with low requirements for temperature stability, the first lens to the eighth lens in the optical lens may be made of plastic. The optical lens is made of plastic, so that the manufacturing cost can be effectively reduced. Of course, the first lens to the eighth lens in the optical lens may also be made of plastic and glass in combination.

The application also provides electronic equipment, which comprises the optical lens and an imaging element for converting an optical image formed by the optical lens into an electric signal. The imaging element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The electronic device may be a stand-alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The electronic device is equipped with the optical lens described above.

However, it will be appreciated by those skilled in the art that the number of lenses making up an optical lens can be varied to achieve the various results and advantages described in this 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.

Examples of specific surface types and parameters applicable to the optical lens of the above embodiment are further described below with reference to the drawings.

It should be noted that any of the following examples one to eight is applicable to all embodiments of the present application.

Example one

Fig. 1 is a schematic view of an optical lens structure according to an example.

As shown in fig. 1, the optical lens sequentially includes, from an image side to an object side: the optical lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an optical filter L9, a first protective glass L10, a second protective glass L11, a third protective glass L12 and an object plane OBJ.

The first lens L1 has negative optical power, the first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has negative optical power, the first side S3 of the second lens is concave, and the second side S4 of the second lens is concave. The third lens L3 has positive optical power, the first side S5 of the third lens is convex, and the second side S6 of the third lens is convex. The fourth lens L4 has positive optical power, the first side S7 of the fourth lens is concave, and the second side S8 of the fourth lens is convex. The fifth lens L5 has negative optical power, the first side S10 of the fifth lens is concave, and the second side S11 of the fifth lens is concave. The sixth lens L6 has positive optical power, the first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is convex. The seventh lens L7 has positive optical power, the first side S13 of the seventh lens is convex, and the second side S14 of the seventh lens is convex. The eighth lens L8 has positive optical power, the first side S15 of the eighth lens is concave, and the second side S16 of the eighth lens is convex. The filter L9 has a first side S17 of the filter and a second side S18 of the filter. The first protective glass L10 has a first side S19 of the first protective glass and a second side S20 of the first protective glass. The second cover glass L11 has a first side S21 of the second cover glass and a second side S22 of the second cover glass. Light from the object plane OBJ on the object side sequentially passes through the respective surfaces S22 to S1 and is finally imaged on a projection screen (projection screen not shown) on the left side of the optical lens. In this example, the total effective focal length F of the optical lens is 13.191mm, the maximum field angle FOV of the optical lens is 38.960 °, and the total length TTL of the optical lens is 79.945mm.

Table 1 shows a basic structural parameter table of an optical lens of example one, in which the Radius of curvature Radius, thickness/distance are each in millimeters (mm).

Surf	Radius	Thickness	Nd	Vd
						1	15.247	2.107	1.59	61.16
2	7.442	5.033
					3	-18.579	1.621	1.49	70.42
4	17.027	2.263
					5	32.065	3.483	1.83	42.74
6	-31.921	1.561
					7	-76.476	2.981	1.81	41.02
8	-28.670	12.078
					9	Infinite number of cases	6.224
10	-37.298	1.510	1.81	25.48
					11	12.717	5.744	1.50	81.59
12	-18.757	0.105
					13	37.520	4.974	1.50	81.61
14	-33.764	0.110
					15	-62.362	5.283	1.76	26.61
16	-20.688	1.298
					17	Infinite number of cases	0.700	1.52	64.17
18	Infinite number of cases	18.720
					19	Infinite number of cases	0.550	1.52	58.57
20	Infinite number of cases	2.200
					21	Infinite number of cases	0.700	1.48	68.00
22	Infinite number of cases	0.700	1.51	62.00
					23	Infinite number of cases	0.000

Table 1 in example one, the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical 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; a confc; A. b, C, D, E, F are all high order coefficients. Table 2 below shows the cone coefficients k and the respective higher order coefficients A, B, C, D, E, F that can be used for the aspherical lens surfaces S1, S2, S13, and S14 in example one.

TABLE 2

Example two

As shown in fig. 2, an optical lens of example two of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 2 shows a schematic diagram of an optical lens structure of example two.

As shown in fig. 2, the optical lens sequentially includes, from an image side to an object side: the optical lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an optical filter L9, a first protective glass L10, a second protective glass L11, a third protective glass L12 and an object plane OBJ.

The first lens L1 has negative optical power, the first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has negative optical power, the first side S3 of the second lens is concave, and the second side S4 of the second lens is concave. The third lens L3 has positive optical power, the first side S5 of the third lens is convex, and the second side S6 of the third lens is convex. The fourth lens L4 has positive optical power, the first side S7 of the fourth lens is concave, and the second side S8 of the fourth lens is convex. The fifth lens L5 has negative optical power, the first side S10 of the fifth lens is concave, and the second side S11 of the fifth lens is concave. The sixth lens L6 has positive optical power, the first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is convex. The seventh lens L7 has positive optical power, the first side S13 of the seventh lens is convex, and the second side S14 of the seventh lens is convex. The eighth lens L8 has positive optical power, the first side S15 of the eighth lens is concave, and the second side S16 of the eighth lens is convex. The filter L9 has a first side S17 of the filter and a second side S18 of the filter. The first protective glass L10 has a first side S19 of the first protective glass and a second side S20 of the first protective glass. The second cover glass L11 has a first side S21 of the second cover glass and a second side S22 of the second cover glass. Light from the object plane OBJ on the object side sequentially passes through the respective surfaces S22 to S1 and is finally imaged on a projection screen (projection screen not shown) on the left side of the optical lens.

In this example, the total effective focal length F of the optical lens is 13.219mm, the maximum field angle FOV of the optical lens is 38.960 °, and the total length TTL of the optical lens is 79.671mm.

Table 3 shows a basic structural parameter table of an optical lens of example two, in which the Radius of curvature Radius, thickness/distance are each in millimeters (mm).

TABLE 3 Table 3

Table 4 below shows the cone coefficients k and the respective higher order coefficients A, B, C, D, E, F that can be used for the aspherical lens surfaces S1, S2, S13, and S14 in example two.

Higher order of term	/	4	6	8
					Surf	K	A	B	C
1	-2.90E-01	-1.031767E-04	-3.685578E-07	2.357001E-09
					2	-4.93E-01	-1.390513E-04	-1.986054E-06	9.539027E-10
13	-4.70E+00	-2.665506E-05	-1.149526E-07	-1.018289E-09
					14	1.54E+00	-7.465960E-06	-1.784010E-07	-1.126428E-09
Higher order of term	10	12	14
					Surf	D	E	F
1	-1.719382E-11	1.455117E-13	-2.346534E-15
					2	-1.511538E-10	1.098091E-13	-1.005310E-14
13	1.633872E-12	4.201334E-14	1.081397E-15
					14	-2.592245E-12	1.943979E-14	3.881304E-16

TABLE 4 Table 4

Example three

As shown in fig. 3, an optical lens of example three of the present application is described. Fig. 3 shows a schematic diagram of an optical lens structure of example three.

As shown in fig. 3, the optical lens sequentially includes, from an image side to an object side: the optical lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an optical filter L9, a first protective glass L10, a second protective glass L11, a third protective glass L12 and an object plane OBJ.

The first lens L1 has negative optical power, the first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has negative optical power, the first side S3 of the second lens is concave, and the second side S4 of the second lens is concave. The third lens L3 has positive optical power, the first side S5 of the third lens is convex, and the second side S6 of the third lens is convex. The fourth lens L4 has positive optical power, the first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has negative optical power, the first side S10 of the fifth lens is concave, and the second side S11 of the fifth lens is concave. The sixth lens L6 has positive optical power, the first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is convex. The seventh lens L7 has positive optical power, the first side S13 of the seventh lens is convex, and the second side S14 of the seventh lens is convex. The eighth lens L8 has positive optical power, the first side S15 of the eighth lens is convex, and the second side S16 of the eighth lens is convex. The filter L9 has a first side S17 of the filter and a second side S18 of the filter. The first protective glass L10 has a first side S19 of the first protective glass and a second side S20 of the first protective glass. The second cover glass L11 has a first side S21 of the second cover glass and a second side S22 of the second cover glass. Light from the object plane OBJ on the object side sequentially passes through the respective surfaces S22 to S1 and is finally imaged on a projection screen (projection screen not shown) on the left side of the optical lens.

In this example, the total effective focal length F of the optical lens is 13.445mm, the maximum field angle FOV of the optical lens is 38.960 °, and the total length TTL of the optical lens is 79.883mm.

Table 5 shows a basic structural parameter table of the optical lens of example three, in which the Radius of curvature Radius, thickness/distance are each in millimeters (mm).

TABLE 5

Table 6 below shows the conic coefficients k and the respective higher order coefficients A, B, C, D, E, F that can be used for the aspherical lens surfaces S1, S2, S13, and S14 in example three.

Higher order of term	/	4	6	8
					Surf	K	A	B	C
1	-2.27E-01	-9.993557E-05	4.422300E-08	5.332192E-09
					2	-4.72E-01	-1.447269E-04	-1.240734E-06	1.075606E-08
13	-3.35E+00	-2.394002E-05	-8.802487E-08	-4.995424E-10
					14	2.85E+00	-1.588190E-05	-1.322598E-07	-4.011446E-10
Higher order of term	10	12	14
					Surf	D	E	F
1	-2.511563E-11	-1.361219E-13	-1.816830E-15
					2	3.122516E-11	1.589752E-12	-1.013825E-13
13	6.708815E-12	3.285199E-14	-4.969547E-16
					14	1.568015E-12	8.195882E-15	-2.613503E-16

TABLE 6

Example four

As shown in fig. 4, an optical lens of example four of the present application is described. Fig. 4 shows a schematic diagram of an optical lens structure of example four.

As shown in fig. 4, the optical lens sequentially includes, from an image side to an object side: the optical lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an optical filter L9, a first protective glass L10, a second protective glass L11, a third protective glass L12 and an object plane OBJ.

In this example, the total effective focal length F of the optical lens is 13.401mm, the maximum field angle FOV of the optical lens is 38.960 °, and the total length TTL of the optical lens is 79.893mm.

Table 7 shows a basic structural parameter table of an optical lens of example four, in which the Radius of curvature Radius, thickness/distance are each in millimeters (mm).

Surf	Radius	Thickness	Nd	Vd
						1	13.275	1.520	1.5891	61.1630
2	7.285	5.831
					3	-16.336	1.615	1.4875	70.4196
4	17.636	2.136
					5	27.651	3.926	1.8348	42.7432
6	-40.835	0.110
					7	44.292	2.988	1.8061	41.0235
8	-1127.751	14.662
					9	Infinite number of cases	4.563
10	-31.028	1.882	1.8052	25.4773
					11	13.510	5.405	1.4970	81.5947
12	-20.438	0.900
					13	35.912	5.499	1.4970	81.6149
14	-28.575	0.631
					15	82.127	3.356	1.7618	26.6132
16	-45.935	1.299
					17	Infinite number of cases	0.700	1.5168	64.1673
18	Infinite number of cases	18.720
					19	Infinite number of cases	0.550	1.5231	58.5714
20	Infinite number of cases	2.200
					21	Infinite number of cases	0.700	1.48	68.00
22	Infinite number of cases	0.700	1.51	62.00
					23	Infinite number of cases	0.000

TABLE 7

Table 8 below shows the cone coefficients k and the respective higher order term coefficients A, B, C, D, E, F that can be used for the aspherical lens surfaces S1, S2, S13, and S14 in example four.

TABLE 8

Example five

As shown in fig. 5, an optical lens of example five of the present application is described. Fig. 5 shows a schematic diagram of an optical lens structure of example five.

As shown in fig. 5, the optical lens sequentially includes, from an image side to an object side: the optical lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an optical filter L9, a first protective glass L10, a second protective glass L11, a third protective glass L12 and an object plane OBJ.

In this example, the total effective focal length F of the optical lens is 13.370mm, the maximum field angle FOV of the optical lens is 38.960 °, and the total length TTL of the optical lens is 79.889mm.

Table 9 shows a basic structural parameter table of the optical lens of example five, in which the Radius of curvature Radius, thickness/distance are each in millimeters (mm).

TABLE 9

Table 10 below shows the cone coefficients k and the respective higher order term coefficients A, B, C, D, E, F that can be used for the aspherical lens surfaces S1, S2, S15, and S16 in example five.

Higher order of term	/	4	6	8
					Surf	K	A	B	C
1	7.07E-01	-8.353082E-05	3.661491E-07	4.017326E-09
					2	-3.94E-01	-1.093627E-04	-4.590585E-07	1.384722E-08
15	-4.79E+01	-5.160345E-06	-4.447684E-08	2.767282E-10
					16	1.04E+00	-4.005769E-06	-6.058250E-09	2.376517E-10
Higher order of term	10	12	14
					Surf	D	E	F
1	-4.723052E-11	-7.181328E-14	-2.404735E-15
					2	-8.773269E-11	-3.364509E-13	-3.251727E-14
15	0	0	0
					16	0	0	0

Table 10

Example six

As shown in fig. 6, an optical lens of a sixth example of the present application is described. Fig. 6 shows a schematic diagram of an optical lens structure of example six.

As shown in fig. 6, the optical lens sequentially includes, from an image side to an object side: the optical lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an optical filter L9, a first protective glass L10, a second protective glass L11, a third protective glass L12 and an object plane OBJ.

In this example, the total effective focal length F of the optical lens is 13.379mm, the maximum field angle FOV of the optical lens is 38.960 °, and the total length TTL of the optical lens is 79.893mm.

Table 11 shows a basic structural parameter table of an optical lens of example six, in which the Radius of curvature Radius, thickness/distance are each in millimeters (mm).

TABLE 11

Table 12 below shows the cone coefficients k and the respective higher order term coefficients A, B, C, D, E, F that can be used for the aspherical lens surfaces S1, S2, S15, and S16 in example six.

Higher order of term	/	4	6	8
					Surf	K	A	B	C
1	9.00E-01	-7.973272E-05	3.775462E-07	3.780455E-09
					2	-3.80E-01	-1.048063E-04	-4.299669E-07	1.422772E-08
15	-4.92E+01	-5.351408E-06	-4.625962E-08	3.037737E-10
					16	1.33E+00	-4.255575E-06	-4.895328E-09	2.631577E-10
Higher order of term	10	12	14
					Surf	D	E	F
1	-4.979420E-11	-8.478698E-14	-1.397657E-15
					2	-1.030395E-10	-5.201319E-13	-2.615834E-14
15	0	0	0
					16	0	0	0

Table 12

Example seven

As shown in fig. 7, an optical lens of example seven of the present application is described. Fig. 7 shows a schematic diagram of an optical lens structure of example seven.

As shown in fig. 7, the optical lens sequentially includes, from an image side to an object side: the optical lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an optical filter L9, a first protective glass L10, a second protective glass L11, a third protective glass L12 and an object plane OBJ.

The first lens L1 has negative optical power, the first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has negative optical power, the first side S3 of the second lens is concave, and the second side S4 of the second lens is concave. The third lens L3 has positive optical power, the first side S5 of the third lens is convex, and the second side S6 of the third lens is convex. The fourth lens L4 has positive optical power, the first side S7 of the fourth lens is concave, and the second side S8 of the fourth lens is convex. The fifth lens L5 has negative optical power, the first side S10 of the fifth lens is concave, and the second side S11 of the fifth lens is convex. The sixth lens L6 has positive optical power, the first side S11 of the sixth lens is concave, and the second side S12 of the sixth lens is convex. The seventh lens L7 has positive optical power, the first side S13 of the seventh lens is convex, and the second side S14 of the seventh lens is convex. The eighth lens L8 has positive optical power, the first side S15 of the eighth lens is concave, and the second side S16 of the eighth lens is convex. The filter L9 has a first side S17 of the filter and a second side S18 of the filter. The first protective glass L10 has a first side S19 of the first protective glass and a second side S20 of the first protective glass. The second cover glass L11 has a first side S21 of the second cover glass and a second side S22 of the second cover glass. Light from the object plane OBJ on the object side sequentially passes through the respective surfaces S22 to S1 and is finally imaged on a projection screen (projection screen not shown) on the left side of the optical lens.

In this example, the total effective focal length F of the optical lens is 13.342mm, the maximum field angle FOV of the optical lens is 38.960 °, and the total length TTL of the optical lens is 79.925mm.

Table 13 shows a basic structural parameter table of an optical lens of example seven, in which the Radius of curvature Radius, thickness/distance are each in millimeters (mm).

Surf	Radius	Thickness	Nd	Vd
						1	10.212	1.795	1.589	61.163
2	6.562	5.829
					3	-29.476	1.510	1.487	70.420
4	15.374	1.509
					5	20.653	3.232	1.835	42.743
6	-76.543	14.138
					7	-44.987	4.782	1.806	41.023
8	-21.098	0.267
					9	Infinite number of cases	5.439
10	-12.732	1.603	1.805	25.477
					11	-139.479	4.064	1.497	81.595
12	-15.912	3.082
					13	27.185	5.327	1.497	81.595
14	-26.550	0.110
					15	-554.414	2.314	1.803	45.526
16	-49.887	1.353
					17	Infinite number of cases	0.700	1.517	64.167
18	Infinite number of cases	18.720
					19	Infinite number of cases	0.550	1.523	58.571
20	Infinite number of cases	2.200
					21	Infinite number of cases	0.700	1.48	68.00
22	Infinite number of cases	0.700	1.51	62.00
					23	Infinite number of cases	0.000

TABLE 13

Table 14 below shows the conic coefficients k and the respective higher order coefficients A, B, C, D, E, F that can be used for the aspherical lens surfaces S1, S2, S15, and S16 in example seven.

TABLE 14

Example eight

As shown in fig. 8, an optical lens of example eight of the present application is described. Fig. 8 shows a schematic diagram of an optical lens structure of example eight.

As shown in fig. 8, the optical lens sequentially includes, from an image side to an object side: the optical lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an optical filter L9, a first protective glass L10, a second protective glass L11, a third protective glass L12 and an object plane OBJ.

In this example, the total effective focal length F of the optical lens is 13.389mm, the maximum field angle FOV of the optical lens is 38.960 °, and the total length TTL of the optical lens is 79.924mm.

Table 15 shows a basic structural parameter table of an optical lens of example eight, in which the Radius of curvature Radius, thickness/distance are each in millimeters (mm).

TABLE 15

Table 16 below shows the conic coefficients k and the respective higher order coefficients A, B, C, D, E, F that can be used for the aspherical lens surfaces S1, S2, S15, and S16 in example eight.

Higher order of term	/	4	6	8
					Surf	K	A	B	C
1	-7.36E-02	-9.698772E-05	-4.483319E-07	2.284653E-09
					2	-4.76E-01	-9.429320E-05	-1.141510E-06	4.365464E-09
15	0.00E+00	-1.200707E-05	-2.146537E-08	-2.396787E-10
					16	-7.36E+00	6.005136E-06	-1.954420E-08	7.030903E-11
Higher order of term	10	12	14
					Surf	D	E	F
1	-4.030242E-11	-3.262615E-13	-2.967758E-15
					2	-4.760086E-11	8.213596E-13	-1.006695E-13
15	6.93E-14	0	0
					16	-8.12E-13	0	0

In summary of table 16, examples one to eight satisfy the relationships shown in table 17, respectively.

TABLE 17

Table 18 shows the effective focal lengths F of the optical lenses of examples one to eight, the effective focal lengths F1 to F8 of the respective lenses, and the like (unit: mm).

TABLE 18

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

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

a first lens having negative optical power, a first side surface of the first lens being a convex surface, and a second side surface of the first lens being a concave surface;

a second lens having negative optical power, a first side of the second lens being concave, a second side of the second lens being concave;

A third lens having positive optical power, a first side of the third lens being convex, a second side of the third lens being convex;

a fourth lens having positive optical power, at least one of a first side surface and a second side surface of the fourth lens being convex;

a fifth lens having negative optical power, at least one of a first side surface and a second side surface of the fifth lens being a concave surface;

a sixth lens having positive optical power, at least one of a first side surface and a second side surface of the sixth lens being convex;

a seventh lens having positive optical power, a first side of the seventh lens being convex, a second side of the seventh lens being convex;

and an eighth lens having positive optical power, at least one of the first side and the second side of the eighth lens being convex.

2. The optical lens of claim 1, wherein the first side of the fourth lens is concave and the second side of the fourth lens is convex.

3. The optical lens of claim 1, wherein the first side of the fourth lens is convex and the second side of the fourth lens is convex.

4. The optical lens of claim 1, wherein the first side of the fifth lens is concave and the second side of the fifth lens is concave.

5. The optical lens of claim 1, wherein the first side of the fifth lens is concave and the second side of the fifth lens is convex.

6. The optical lens of claim 1, wherein the first side of the sixth lens is convex and the second side of the sixth lens is convex.

7. The optical lens of claim 1, wherein the first side of the sixth lens is concave and the second side of the sixth lens is convex.

8. The optical lens of claim 1, wherein the first side of the eighth lens is concave and the second side of the eighth lens is convex.

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

a first lens having negative optical power;

a second lens having negative optical power;

a third lens having positive optical power;

a fourth lens having positive optical power;

A fifth lens having negative optical power;

a sixth lens having positive optical power;

a seventh lens having positive optical power;

an eighth lens having positive optical power;

the maximum aperture D1 of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: D1/H/FOV is less than or equal to 0.12.

10. An electronic device comprising the optical lens of any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.