CN114200651A

CN114200651A - Camera lens

Info

Publication number: CN114200651A
Application number: CN202210090138.XA
Authority: CN
Inventors: 张龙; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-03-18

Abstract

The invention provides a camera lens. The imaging lens includes: a first lens having an optical power; a second lens having a focal power, the focal length of the second lens being variable; the surface of the third lens close to the image side is a convex surface; a fourth lens having an optical power; the surface of the fifth lens close to the object side is a concave surface, and the surface of the fifth lens close to the image side is a convex surface; the surface of the sixth lens, which is close to the object side, is a concave surface; a seventh lens having optical power; an eighth lens having optical power; the effective focal length f of the camera lens and the effective focal length f1 of the first lens satisfy that: 0< | f/f1 | < 3; the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the imaging lens satisfies ImgH > 5. The invention solves the problem of large volume of the camera lens in the prior art.

Description

Camera lens

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to a camera lens.

Background

With the popularization of mobile phones, the daily shooting requirements of mobile phones are more and more, the shooting requirements of camera lenses are higher and higher, the camera lenses on the mobile phones have a zooming function at present, the camera lenses on the mobile phones are all provided with two lenses, and then the lenses are driven to move through a motor so as to change the distance between the two lenses to realize zooming. However, this case leads to a large imaging lens.

That is, the imaging lens in the related art has a problem of being bulky.

Disclosure of Invention

The invention mainly aims to provide a camera lens, which is used for solving the problem of large volume of the camera lens in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens comprising: a first lens having an optical power; a second lens having a focal power, the focal length of the second lens being variable; the surface of the third lens close to the image side is a convex surface; a fourth lens having an optical power; the surface of the fifth lens close to the object side is a concave surface, and the surface of the fifth lens close to the image side is a convex surface; the surface of the sixth lens, which is close to the object side, is a concave surface; a seventh lens having optical power; an eighth lens having optical power; the effective focal length f of the camera lens and the effective focal length f1 of the first lens satisfy that: 0< | f/f1 | <3, and ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the imaging lens, satisfies ImgH > 5.

Further, an effective half aperture DT12 of a surface of the first lens close to the image side and an effective half aperture DT31 of a surface of the third lens close to the object side satisfy: DT31/DT12 <1.

Further, the effective half aperture DT11 of the surface of the first lens close to the object side, the effective half aperture DT21 of the surface of the third lens close to the object side, and the effective half aperture DT32 of the surface of the third lens close to the image side satisfy: (DT21+ DT11)/DT32< 2.5.

Further, the minimum focal length fmin of the camera lens and the maximum focal length fmax of the camera lens satisfy: (fmax/fmin) 10> 8.

Furthermore, the radius of curvature R3 of the surface of the second lens element near the object side is variable and satisfies | R3 | ≧ 29 mm.

Further, an on-axis distance TTL from the surface of the first lens element near the object side to the imaging plane of the imaging lens and a half ImgH of a diagonal length of the effective pixel region on the imaging plane satisfy: TTL/ImgH < 1.5.

Further, a central thickness CT7 of the seventh lens on the optical axis and a central thickness CT8 of the eighth lens on the optical axis satisfy: 0.9< CT8/CT 7< 1.5.

Further, the center thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 of the sixth lens satisfy: 0.5< ET6/CT 6< 2.

Further, an effective semi-aperture DT11 of a surface of the first lens close to the object side and an effective semi-aperture DT61 of a surface of the sixth lens close to the object side satisfy: 1.4< DT61/DT11< 2.1.

Further, the effective focal length f of the imaging lens and the effective focal length f3 of the third lens satisfy: 0< f/f 3< 1.

Further, a radius of curvature R10 of a surface of the fifth lens near the image side and a radius of curvature R9 of a surface of the fifth lens near the object side satisfy: 5< (R10+ R9)/(R10-R9) < 19.

Further, the central thickness CT3 of the third lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: CT5/CT3 is more than or equal to 1.03.

Further, an on-axis distance SAG41 between an intersection point of a surface of the fourth lens near the object side and the optical axis to an effective radius vertex of the surface of the fourth lens near the object side, and an on-axis distance SAG51 between an intersection point of a surface of the fifth lens near the object side and the optical axis to an effective radius vertex of the surface of the fifth lens near the object side satisfy: 0< SAG41/SAG51 <1.

Further, an on-axis distance SAG42 between an intersection point of a surface of the fourth lens close to the image side and the optical axis to an effective radius vertex of the surface of the fourth lens close to the image side, and an on-axis distance SAG52 between an intersection point of a surface of the fifth lens close to the image side and the optical axis to an effective radius vertex of the surface of the fifth lens close to the image side satisfy: SAG52/SAG42> 3.

Further, a radius of curvature R7 of a surface of the third lens near the image side and a radius of curvature R10 of a surface of the fifth lens near the object side satisfy: -1< R10/R7< 0.

Further, the power of the second lens is continuously variable.

Further, the second lens is a liquid lens.

Further, an air interval T45 of the fourth lens and the fifth lens on the optical axis, and an air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 1< T78/T45< 1.6.

Further, an on-axis distance TTL from the surface of the first lens near the object side to the imaging surface of the image pickup lens, a sum Σ AT of air intervals on the optical axis between any adjacent two lenses having optical powers out of the first lens to the lens closest to the imaging surface of the image pickup lens, satisfy: 2< TTL/Σ AT < 3.8.

Further, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens and the effective focal length f8 of the eighth lens satisfy: 0< | (f6+ f4)/f8 | 2.

Further, a radius of curvature R6 of a surface of the third lens near the image side and an effective focal length f3 of the third lens satisfy: -1< R6/f3< 0.

According to another aspect of the present invention, there is provided an imaging lens including: a first lens having an optical power; a second lens having a focal power, the focal length of the second lens being variable; the surface of the third lens close to the image side is a convex surface; a fourth lens having an optical power; the surface of the fifth lens close to the object side is a concave surface, and the surface of the fifth lens close to the image side is a convex surface; the surface of the sixth lens, which is close to the object side, is a concave surface; a seventh lens having optical power; an eighth lens having optical power; wherein the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens and the effective focal length f8 of the eighth lens satisfy: 0< | (f6+ f4)/f8 | 2, and ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the imaging lens, satisfies ImgH > 5.

Further, the power of the second lens is continuously variable.

Further, the second lens is a liquid lens.

By applying the technical scheme of the invention, the camera lens 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, wherein the first lens has focal power; the second lens has focal power, and the focal length of the second lens is variable; the third lens has positive focal power, and the surface of the third lens close to the image side is a convex surface; the fourth lens has focal power; the fifth lens has focal power, the surface of the fifth lens close to the object side is a concave surface, and the surface of the fifth lens close to the image side is a convex surface; the sixth lens has positive focal power, and the surface of the sixth lens close to the object side is a concave surface; the seventh lens has focal power; the eighth lens has focal power; the effective focal length f of the camera lens and the effective focal length f1 of the first lens satisfy that: 0< | f/f1 | <3, and ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the imaging lens, satisfies ImgH > 5.

Through the distribution of positive and negative of the focal power of each lens of the camera lens of reasonable control, can effectual balance camera lens's low order aberration, can reduce camera lens's tolerance's sensitivity simultaneously, guarantee camera lens's image quality when keeping camera lens's miniaturization, eight formula camera lens can improve camera lens's image quality. Through the ratio of the effective focal length of the camera lens to the effective focal length of the first lens, the reasonable distribution of the focal power of the camera lens is facilitated, and the imaging quality of the camera lens is improved. And through setting the second lens to the changeable form of focus, the focus that can effectual adjustment camera lens need not the motor and drives the camera lens motion, has effectively reduced camera lens's length, is favorable to camera lens's miniaturization. And ImgH >5 enables the camera lens to have the advantage of a large image plane.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing a configuration of an imaging lens according to a first example of the present invention;

fig. 2 to 7 show an axial chromatic aberration curve, an astigmatism curve in a second state, a distortion curve in the second state, an astigmatism curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve of the imaging lens in fig. 1, respectively;

fig. 8 is a schematic view showing a configuration of an imaging lens according to a second example of the present invention;

fig. 9 to 14 show an axial chromatic aberration curve, an astigmatism curve in a second state, a distortion curve in the second state, an astigmatism curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve of the imaging lens in fig. 8, respectively;

fig. 15 is a schematic view showing a configuration of an imaging lens according to a third example of the present invention;

fig. 16 to 21 show an axial chromatic aberration curve, an astigmatism curve in a second state, a distortion curve in the second state, an astigmatism curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve of the imaging lens in fig. 15, respectively;

fig. 22 is a schematic view showing a configuration of an imaging lens of example four of the present invention;

fig. 23 to 28 show an axial chromatic aberration curve, an astigmatism curve in a second state, a distortion curve in the second state, an astigmatism curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve of the imaging lens in fig. 22, respectively;

fig. 29 is a schematic view showing a configuration of an imaging lens of example five of the present invention;

fig. 30 to 35 show an axial chromatic aberration curve, an astigmatism curve in a second state, a distortion curve in the second state, an astigmatism curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve of the imaging lens in fig. 29, respectively;

fig. 36 is a schematic view showing a configuration of an imaging lens of example six of the present invention;

fig. 37 to 42 show an axial chromatic aberration curve, an astigmatism curve in a second state, a distortion curve in the second state, an astigmatism curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve of the imaging lens in fig. 36, respectively;

fig. 43 is a schematic diagram showing a configuration of an imaging lens of example seven of the present invention;

fig. 44 to 49 respectively show an axial chromatic aberration curve, an astigmatism curve in a second state, a distortion curve in the second state, an astigmatism curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve of the imaging lens in fig. 43;

FIG. 50 shows a schematic structural view of a second lens of an alternative embodiment of the present invention;

FIG. 51 shows a schematic structural view of a second lens of another alternative embodiment of the present invention;

fig. 52 shows a schematic view of the structure of the second lens of another alternative embodiment of the present invention.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the surface of the first lens close to the object side; s2, the surface of the first lens close to the image side; e2, second lens; s3, the surface of the second lens close to the object side; s4, a first middle surface; s5, a second middle surface; s6, a third intermediate plane; s7, the surface of the second lens close to the image side; e3, third lens; s8, the surface of the third lens close to the object side; s9, the surface of the third lens close to the image side; e4, fourth lens; s10, the surface of the fourth lens close to the object side; s11, the surface of the fourth lens close to the image side; e5, fifth lens; s12, the surface of the fifth lens close to the object side; s13, the surface of the fifth lens close to the image side; e6, sixth lens; s14, the surface of the sixth lens close to the object side; s15, the surface of the sixth lens close to the image side; e7, a seventh lens, S16, a surface of the seventh lens near the object side; s17, the surface of the seventh lens close to the image side; e8, eighth lens; s18, a surface of the eighth lens element near the object side; s19, the surface of the eighth lens close to the image side; e9, a filter plate; s20, the surface of the filter close to the object side; s21, the surface of the filter close to the image side; and S22, imaging surface.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, 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.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, it means that 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 determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. With respect to the surface near the object side, when the value of R is positive, it is determined to be convex, and when the value of R is negative, it is determined to be concave; the surface closer to the image side is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The invention provides a camera lens, aiming at solving the problem that the camera lens in the prior art is large in size.

Example one

As shown in fig. 1 to 52, the imaging lens includes 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 first lens having a power; the second lens has focal power, and the focal length of the second lens is variable; the third lens has positive focal power, and the surface of the third lens close to the image side is a convex surface; the fourth lens has focal power; the fifth lens has focal power, the surface of the fifth lens close to the object side is a concave surface, and the surface of the fifth lens close to the image side is a convex surface; the sixth lens has positive focal power, and the surface of the sixth lens close to the object side is a concave surface; the seventh lens has focal power; the eighth lens has focal power; the effective focal length f of the camera lens and the effective focal length f1 of the first lens satisfy that: 0< | f/f1 | <3, and ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the imaging lens, satisfies ImgH > 5.

Preferably, the effective focal length f of the image pickup lens and the effective focal length f1 of the first lens satisfy: 1< | f/f1 | 2.

In this embodiment, the effective half aperture DT12 of the surface of the first lens close to the image side and the effective half aperture DT31 of the surface of the third lens close to the object side satisfy: DT31/DT12 <1. The effective half calibers of the surface, close to the object side, of the third lens and the surface, close to the image side, of the first lens are limited within a reasonable range, so that the camera lens is favorably miniaturized, and the requirements of an ultrathin mobile terminal are met. Preferably 0.9< DT31/DT12 <1.

In this embodiment, the effective half aperture DT11 of the surface of the first lens close to the object side, the effective half aperture DT21 of the surface of the third lens close to the object side, and the effective half aperture DT32 of the surface of the third lens close to the image side satisfy: (DT21+ DT11)/DT32< 2.5. By reasonably controlling the ratio of the effective half aperture of the surface of the first lens close to the object side, the effective half aperture of the surface of the third lens close to the object side and the effective half aperture of the surface of the third lens close to the image side, the structure can be more compact, and the resolving power can be improved. Preferably, 1.7< (DT21+ DT11)/DT32< 2.2.

In this embodiment, the minimum focal length fmin of the imaging lens and the maximum focal length fmax of the imaging lens satisfy: (fmax/fmin) 10> 8. By reasonably controlling the ratio of the minimum focal length to the maximum focal length of the camera lens, the focal power of the camera lens can be reasonably distributed, so that the camera lens has good imaging quality and reduced sensitivity. Preferably, 8< fmax/fmin < 13.

In this embodiment, the radius of curvature R3 of the surface of the second lens element near the object side is variable and satisfies | R3 | ≧ 29 mm. The curvature radius of the surface, close to the object side, of the second lens is set to be variable, so that the focal length of the second lens is variable, and the camera lens further realizes zooming, and the camera lens can be focused quickly under the condition that the object distance is small.

In this embodiment, an on-axis distance TTL from a surface of the first lens close to the object side to an imaging plane of the imaging lens and a half ImgH of a diagonal length of an effective pixel region on the imaging plane satisfy: TTL/ImgH < 1.5. The axial distance from the surface of the first lens close to the object side to the imaging surface and the proportion of the effective pixel area of the imaging surface are reasonably restricted, so that the miniaturization of the camera lens is facilitated, and the imaging effect of a large image surface is considered. Preferably, 1.2< TTL/ImgH < 1.48.

In the present embodiment, the central thickness CT7 of the seventh lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis satisfy: 0.9< CT8/CT 7< 1.5. The central thicknesses of the seventh lens and the eighth lens are limited, so that the stability of the assembling process of the camera lens is improved, and the yield of the camera lens is increased. Preferably, 0.95 < CT8/CT 7< 1.4.

In the present embodiment, the center thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 of the sixth lens satisfy: 0.5< ET6/CT 6< 2. By controlling the ratio of the thickness of the edge of the sixth lens to the thickness of the center of the sixth lens, it is helpful to improve the processability of the lens. Preferably 0.7< ET6/CT 6< 1.8.

In this embodiment, the effective semi-aperture DT11 of the surface of the first lens close to the object side and the effective semi-aperture DT61 of the surface of the sixth lens close to the object side satisfy: 1.4< DT61/DT11< 2.1. Through the effective semi-bore of the surface that the rational restraint sixth lens is close to the object side and the surface that first lens is close to the object side, can adjust the light focus position, shorten camera lens's overall length, be favorable to camera lens's miniaturization. Preferably, 1.6< DT61/DT11< 1.9.

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f3 of the third lens satisfy: 0< f/f 3< 1. The effective focal length of the camera lens and the effective focal length of the third lens are reasonably controlled, so that the aberration correction capability of the camera lens is improved. Preferably, 0.3 < f/f 3< 0.8.

In the present embodiment, a radius of curvature R10 of the surface of the fifth lens near the image side and a radius of curvature R9 of the surface of the fifth lens near the object side satisfy: 5< (R10+ R9)/(R10-R9) < 19. By reasonably controlling the curvature radius of the surface of the fifth lens close to the object side and the curvature radius of the surface of the fifth lens close to the image side to be in a certain interval, the on-axis aberration generated by the image pickup lens can be effectively balanced. Preferably 7< (R10+ R9)/(R10-R9) < 17.

In the present embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: CT5/CT3 is more than or equal to 1.03. Through controlling the ratio of the center thicknesses of the third lens and the fifth lens, the assembling stability of the camera lens is favorably improved, and the yield of the camera lens is increased. Preferably, 1.03 ≦ CT5/CT 3< 1.6.

In this embodiment, an on-axis distance SAG41 between an intersection point of a surface of the fourth lens near the object side and the optical axis and an effective radius vertex of the surface of the fourth lens near the object side, and an on-axis distance SAG51 between an intersection point of a surface of the fifth lens near the object side and the optical axis and an effective radius vertex of the surface of the fifth lens near the object side satisfy: 0< SAG41/SAG51 <1. The ratio range of SAG41 and SAG51 is reasonably controlled, so that the relative illumination of the camera lens is favorably improved, and the resolution is improved. Preferably, 0.4 < SAG41/SAG51 < 0.8.

In the present embodiment, the on-axis distance SAG42 between the intersection point of the surface of the fourth lens close to the image side and the optical axis and the effective radius vertex of the surface of the fourth lens close to the image side, and the on-axis distance SAG52 between the intersection point of the surface of the fifth lens close to the image side and the optical axis and the effective radius vertex of the surface of the fifth lens close to the image side satisfy: SAG52/SAG42> 3. The ratio range of SAG52 and SAG42 is reasonably controlled, so that the condition that the light rays of the camera lens have a small incident angle when being incident to the imaging surface is favorably ensured, and higher relative illumination is obtained. Preferably 4< SAG52/SAG42 < 25.

In this embodiment, a radius of curvature R7 of a surface of the third lens close to the image side and a radius of curvature R10 of a surface of the fifth lens close to the object side satisfy: -1< R10/R7< 0. Curvature radiuses of the surface, close to the image side, of the third lens and the surface, close to the object side, of the fifth lens are reasonably constrained, the correction capability of the camera lens on field curvature is favorably improved, and the system resolution is improved. Preferably, -0.7< R10/R7< -0.1.

In this embodiment, the power of the second lens is continuously variable. The focal power of the second lens is continuously variable through the module, so that the imaging performance of the camera lens under different object distances is greatly improved, and the camera lens can meet the shooting requirements under different object distances; the length of the whole camera lens is greatly shortened by adding the second lens, so that the structure of the camera lens is more compact, and the requirement of miniaturization is met.

In this embodiment, the second lens is a liquid lens.

In the present embodiment, the air interval T45 on the optical axis of the fourth lens and the fifth lens, and the air interval T78 on the optical axis of the seventh lens and the eighth lens satisfy: 1< T78/T45< 1.6. By limiting the T78/T45 within a reasonable range, the convergence capability of the camera lens on light rays is improved. Preferably, 1.1< T78/T45< 1.5.

In the present embodiment, an on-axis distance TTL from a surface of the first lens close to the object side to the imaging surface of the imaging lens, a sum Σ AT of air intervals on the optical axis between any adjacent two lenses having optical power among the first lens and the lens closest to the imaging surface of the imaging lens satisfy: 2< TTL/Σ AT < 3.8. By restricting the distance from the surface of the first lens close to the object side to the imaging surface on the axis and the sum of the air intervals on the optical axis between the first lens and any two adjacent lenses with focal power in the lens closest to the imaging surface, the field curvature generated by every two adjacent lenses in the camera lens can be balanced, and the self-correcting capacity of the camera lens for the field curvature is improved. Preferably, 2.5< TTL/Σ AT < 3.2.

In the present embodiment, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens, and the effective focal length f8 of the eighth lens satisfy: 0< | (f6+ f4)/f8 | 2. By controlling | (f6+ f4)/f8 | within a reasonable range, the eighth lens element assumes a large power, which is advantageous in correcting aberrations and can shorten the total length of the imaging lens. Preferably 0< | (f6+ f4)/f8 | 1.8.

In the present embodiment, a radius of curvature R6 of the surface of the third lens near the image side and an effective focal length f3 of the third lens satisfy: -1< R6/f3< 0. By controlling the ratio of the effective focal length of the third lens to the curvature radius of the surface, close to the image side, of the third lens within a reasonable range, the contribution of the third lens to the fifth-order spherical aberration of the camera lens can be well controlled, and further the third-order spherical aberration generated by the lens is compensated, so that the camera lens has good imaging quality on the optical axis. Preferably, -0.7< R6/f3< -0.3.

Example two

As shown in fig. 1 to 52, the imaging lens includes 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 first lens has focal power; the second lens has focal power, and the focal length of the second lens is variable; the third lens has positive focal power, and the surface of the third lens close to the image side is a convex surface; the fourth lens has focal power; the fifth lens has focal power, the surface of the fifth lens close to the object side is a concave surface, and the surface of the fifth lens close to the image side is a convex surface; the sixth lens has positive focal power, and the surface of the sixth lens close to the object side is a concave surface; the seventh lens has focal power; the eighth lens has focal power; wherein the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens and the effective focal length f8 of the eighth lens satisfy: 0< | (f6+ f4)/f8 | 2, and ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the imaging lens, satisfies ImgH > 5.

Through the distribution of positive and negative of the focal power of each lens of the camera lens of reasonable control, can effectual balance camera lens's low order aberration, can reduce camera lens's tolerance's sensitivity simultaneously, guarantee camera lens's image quality when keeping camera lens's miniaturization, eight formula camera lens can improve camera lens's image quality. By controlling | (f6+ f4)/f8 | within a reasonable range, the eighth lens element assumes a large power, which is advantageous in correcting aberrations and can shorten the total length of the imaging lens. And through setting the second lens to the changeable form of focus, the focus that can effectual adjustment camera lens need not the motor and drives the camera lens motion, has effectively reduced camera lens's length, is favorable to camera lens's miniaturization. And ImgH >5 enables the camera lens to have the advantage of a large image plane.

Preferably, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens and the effective focal length f8 of the eighth lens satisfy: 0< | (f6+ f4)/f8 | 1.8.

In this embodiment, the second lens is a liquid lens.

Optionally, the above-described imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an image forming surface.

As shown in fig. 50 to 52, the second lens further includes an object-side surface S3, a first intermediate surface S4, a second intermediate surface S5, a third intermediate surface S6, and an image-side surface S7 of the second lens.

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

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

Example one

As shown in fig. 1 to 7, an imaging lens of the first example of the present application is described. Fig. 1 shows a schematic diagram of an imaging lens structure of example one.

As shown in fig. 1, the camera lens sequentially includes, from a subject side to an imaging side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S22.

The first lens E1 has positive optical power, and a surface S1 close to the object side of the first lens is a convex surface, and a surface S2 close to the image side of the first lens is a concave surface. The third lens E3 has positive optical power, and a surface S8 close to the object side of the third lens is a concave surface, and a surface S9 close to the image side of the third lens is a convex surface. The fourth lens E4 has negative power, and a surface S10 close to the object side of the fourth lens is convex, and a surface S11 close to the image side of the fourth lens is concave. The fifth lens E5 has negative power, and a surface S12 close to the object side of the fifth lens is a concave surface, and a surface S13 close to the image side of the fifth lens is a convex surface. The sixth lens E6 has positive optical power, and a surface S14 close to the object side of the fifth lens is a convex surface, and a surface S15 close to the image side of the fifth lens is a concave surface; the seventh lens E7 has negative power, and a surface S16 close to the object side of the seventh lens is a convex surface, and a surface S17 close to the image side of the seventh lens is a concave surface; the eighth lens element E8 has negative power, and a surface S18 close to the object side of the eighth lens element is a convex surface, and a surface S19 close to the image side of the eighth lens element is a concave surface; the filter E9 has a surface S20 close to the object side and a surface S21 close to the image side. The light from the object sequentially passes through the respective surfaces S1 to S21 and is finally imaged on the imaging surface S22.

When the object distance of the camera lens is 2000mm, the camera lens is in the first state, when the object distance of the camera lens is infinite, the camera lens is in the second state, and when the object distance of the camera lens is 100mm, the camera lens is in the third state.

Table 1 shows a basic structural parameter table of the imaging lens of example one in the first state, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 1

Table 2 shows a basic structural parameter table of the second lens in the second state of the imaging lens of example one, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-550.0000	0.0700	1.41	50.0
S4	Spherical surface	-550.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.3399

TABLE 2

Table 3 shows a basic structural parameter table of the second lens in the third state of the imaging lens of example one, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 3

Table 4 shows the effective focal length of the imaging lens and the effective focal length of the second lens in three states of the imaging lens of example one.

	First state	Second state	Third state
				OBJ(mm)	2000.00	All-round	100.00
f(mm)	5.62	5.64	5.19
				f2(mm)	-	-1891.99	99.73
tan(FOV/2)*f	5.26	5.28	4.86
				f/f1	1.33	1.32	1.44
f/f3	0.49	0.50	0.46

TABLE 4

In example one, a surface of any one of the first lens element E1, the third lens element E3 through the eighth lens element E8 close to the object side and a surface close to the image side are aspheric, and a surface type of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 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 i-th order of the aspherical surface. Table 5 below gives the high-order coefficient coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1, S2, S8-S19 in example one.

TABLE 5

Fig. 2 shows an axial chromatic aberration curve of the imaging lens of the first example, which shows the deviation of the convergent focal points of the light rays of different wavelengths after passing through the imaging lens. Fig. 3 shows astigmatism curves representing meridional field curvature and sagittal field curvature in the second state of the imaging lens of example one. Fig. 4 shows distortion curves of the imaging lens of example one in the second state, which indicate distortion magnitude values corresponding to different angles of view. Fig. 5 shows an astigmatism curve of the imaging lens of example one in the third state. Fig. 6 shows a distortion curve of the imaging lens of example one in the third state. Fig. 7 shows a chromatic aberration of magnification curve of the imaging lens of the first example, which shows the deviation of different image heights on the image forming surface after the light passes through the imaging lens.

As can be seen from fig. 2 to 7, the imaging lens according to the first example can achieve good imaging quality.

Example two

As shown in fig. 8 to 14, an imaging lens of example two of the present application is described. Fig. 8 shows a schematic diagram of the imaging lens structure of example two.

As shown in fig. 8, the camera lens sequentially includes, from the subject side to the imaging side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S22.

The first lens E1 has positive optical power, and a surface S1 close to the object side of the first lens is a convex surface, and a surface S2 close to the image side of the first lens is a concave surface. The third lens E3 has positive optical power, and a surface S8 close to the object side of the third lens is a convex surface, and a surface S9 close to the image side of the third lens is a convex surface. The fourth lens E4 has negative power, and a surface S10 close to the object side of the fourth lens is convex, and a surface S11 close to the image side of the fourth lens is concave. The fifth lens E5 has negative power, and a surface S12 close to the object side of the fifth lens is a concave surface, and a surface S13 close to the image side of the fifth lens is a convex surface. The sixth lens E6 has positive optical power, and a surface S14 close to the object side of the fifth lens is a convex surface, and a surface S15 close to the image side of the fifth lens is a concave surface; the seventh lens E7 has positive optical power, and a surface S16 close to the object side of the seventh lens is a convex surface, and a surface S17 close to the image side of the seventh lens is a concave surface; the eighth lens element E8 has negative power, and a surface S18 close to the object side of the eighth lens element is a convex surface, and a surface S19 close to the image side of the eighth lens element is a concave surface; the filter E9 has a surface S20 close to the object side and a surface S21 close to the image side. The light from the object sequentially passes through the respective surfaces S1 to S21 and is finally imaged on the imaging surface S22.

Table 6 shows a basic structural parameter table of the imaging lens of example two in the first state, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 6

Table 7 shows a basic structural parameter table of the second lens in the second state of the imaging lens of example two, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-550.0000	0.0700	1.41	50.0
S4	Spherical surface	-550.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.2327

TABLE 7

Table 8 shows a basic structural parameter table of the second lens in the third state of the imaging lens of example two, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	29.0000	0.0700	1.41	50.0
S4	Spherical surface	29.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.2327

TABLE 8

Table 9 shows the effective focal length of the image pickup lens and the effective focal length of the second lens in three states of the image pickup lens of example two.

	First state	Second state	Third state
				OBJ(mm)	2000.00	All-round	100.00
f(mm)	5.55	5.58	5.14
				f2(mm)	-	-1909.19	99.73
tan(FOV/2)*f	5.12	5.14	4.74
				f/f1	1.42	1.41	1.53
f/f3	0.68	0.68	0.63

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Watch 10

Fig. 9 shows an axial chromatic aberration curve of the imaging lens of example two, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 10 shows astigmatism curves representing meridional field curvature and sagittal field curvature in the second state of the imaging lens of example two. Fig. 11 shows a distortion curve in the second state of the imaging lens of example two, which shows distortion magnitude values corresponding to different angles of view. Fig. 12 shows an astigmatism curve of the imaging lens of example two in the third state. Fig. 13 shows a distortion curve of the imaging lens of example two in the third state. Fig. 14 shows a chromatic aberration of magnification curve of the imaging lens of example two, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging lens.

As can be seen from fig. 9 to 14, the imaging lens according to example two can achieve good imaging quality.

Example III

As shown in fig. 15 to 21, an imaging lens of example three of the present application is described. Fig. 15 shows a schematic diagram of an imaging lens structure of example three.

As shown in fig. 15, the camera lens sequentially includes, from the subject side to the imaging side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S22.

The first lens E1 has positive optical power, and a surface S1 close to the object side of the first lens is a convex surface, and a surface S2 close to the image side of the first lens is a concave surface. The third lens E3 has positive optical power, and a surface S8 close to the object side of the third lens is a concave surface, and a surface S9 close to the image side of the third lens is a convex surface. The fourth lens E4 has negative power, and a surface S10 close to the object side of the fourth lens is convex, and a surface S11 close to the image side of the fourth lens is concave. The fifth lens E5 has negative power, and a surface S12 close to the object side of the fifth lens is a concave surface, and a surface S13 close to the image side of the fifth lens is a convex surface. The sixth lens E6 has positive optical power, and a surface S14 close to the object side of the fifth lens is a convex surface, and a surface S15 close to the image side of the fifth lens is a concave surface; the seventh lens E7 has positive optical power, and a surface S16 close to the object side of the seventh lens is a convex surface, and a surface S17 close to the image side of the seventh lens is a concave surface; the eighth lens element E8 has negative power, and a surface S18 close to the object side of the eighth lens element is a convex surface, and a surface S19 close to the image side of the eighth lens element is a concave surface; the filter E9 has a surface S20 close to the object side and a surface S21 close to the image side. The light from the object sequentially passes through the respective surfaces S1 to S21 and is finally imaged on the imaging surface S22.

Table 11 shows a basic structural parameter table of the imaging lens of example three in the first state, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 11

Table 12 shows a basic structural parameter table of the second lens in the second state of the imaging lens of example three, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-550.0000	0.0728	1.41	50.0
S4	Spherical surface	-550.0000	0.2081	1.29	100.0
							S5	Spherical surface	All-round	0.0208	1.41	50.0
S6	Spherical surface	All-round	0.2185	1.52	64.2
							S7	Spherical surface	All-round	0.2280

TABLE 12

Table 13 shows a basic structural parameter table of the second lens in the third state of the imaging lens of example three, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Watch 13

Table 14 shows the effective focal length of the imaging lens and the effective focal length of the second lens in three states of the imaging lens of example three.

	First state	Second state	Third state
				OBJ(mm)	2000.00	All-round	100.00
f(mm)	5.83	5.86	5.38
				f2(mm)	-	-1891.99	99.73
tan(FOV/2)*f	5.26	5.28	4.85
				f/f1	1.40	1.40	1.52
f/f3	0.72	0.72	0.66

TABLE 14

Table 15 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Watch 15

Fig. 16 shows an axial chromatic aberration curve of the imaging lens of example three, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 17 shows astigmatism curves representing meridional field curvature and sagittal field curvature in the second state of the imaging lens of example three. Fig. 18 shows a distortion curve in the second state of the imaging lens of example three, which shows distortion magnitude values corresponding to different angles of view. Fig. 19 shows an astigmatism curve in the third state of the imaging lens of example three. Fig. 20 shows a distortion curve in the third state of the imaging lens of example three. Fig. 21 shows a chromatic aberration of magnification curve of the imaging lens of example three, which represents a deviation of different image heights on the imaging surface after the light passes through the imaging lens.

As can be seen from fig. 16 to 21, the imaging lens according to the third example can achieve good image quality.

Example four

As shown in fig. 22 to 28, an imaging lens of the present example four is described. Fig. 22 shows a schematic diagram of an imaging lens structure of example four.

As shown in fig. 22, the camera lens sequentially includes, from the subject side to the imaging side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S22.

Table 16 shows a basic structural parameter table of the imaging lens of example four in the first state, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 16

Table 17 shows a basic structural parameter table of the second lens in the second state of the imaging lens of example four, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-550.0000	0.0700	1.41	50.0
S4	Spherical surface	-550.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.2310

TABLE 17

Table 18 shows a basic structural parameter table of the second lens in the third state of the imaging lens of example four, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	29.0000	0.0700	1.41	50.0
S4	Spherical surface	29.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.2310

Watch 18

Table 19 shows the effective focal length of the imaging lens and the effective focal length of the second lens in three states of the imaging lens of example four.

	First state	Second state	Third state
				OBJ(mm)	2000.00	All-round	100.00
f(mm)	5.61	5.64	5.20
				f2(mm)	-	-1891.99	99.73
tan(FOV/2)*f	5.13	5.15	4.75
				f/f1	1.39	1.39	1.50
f/f3	0.67	0.67	0.62

Watch 19

Table 20 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-7.4833E-02

-1.4509E-02

-2.0794E-03

1.7952E-05

6.8985E-05

4.5587E-05

-4.7918E-07

S2

-7.3126E-02

-9.6744E-03

3.3615E-05

3.8444E-04

9.8708E-05

-2.2291E-05

-3.7080E-05

S8

-2.1062E-02

-4.0071E-03

1.6964E-03

1.0739E-04

-1.1244E-04

-1.5309E-04

-8.7746E-05

S9

-1.1051E-01

5.8327E-04

-1.6177E-03

4.0436E-04

-3.7987E-04

-1.7591E-04

-1.0802E-04

S10

-3.6563E-01

2.4944E-02

-3.7761E-03

4.5736E-04

-2.0791E-04

-1.4576E-05

2.4316E-05

S11

-3.5618E-01

2.1309E-02

-3.6521E-03

6.2459E-04

6.0761E-05

-7.0323E-05

3.1998E-05

S12

3.3737E-01

-7.4257E-02

4.0309E-03

-1.1434E-03

1.0567E-03

-1.6429E-04

-8.9529E-05

S13

1.6100E-01

-3.7853E-02

6.5769E-03

4.7703E-03

1.2335E-03

2.0906E-04

-4.3333E-04

S14

-1.1168E+00

1.8615E-02

-1.8887E-02

1.4802E-02

-3.7893E-04

1.1460E-03

-1.4575E-03

S15

-7.3077E-01

1.6942E-02

4.0493E-02

-1.4901E-02

3.1409E-03

-1.7977E-04

9.3352E-04

S16

-1.1355E+00

-4.2802E-03

8.9544E-02

-3.9093E-02

2.0596E-03

5.4545E-03

3.2901E-03

S17

-1.5139E+00

-5.8838E-03

-8.3816E-04

-2.1260E-02

1.7208E-02

3.6162E-03

-3.3798E-03

S18

-2.7321E+00

8.5433E-01

-3.6696E-01

1.2329E-01

-1.3832E-02

-2.9762E-03

-8.7768E-03

S19

-6.1375E+00

1.2056E+00

-3.2073E-01

1.1709E-01

-6.8117E-02

3.1728E-02

-2.1725E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

5.9094E-06

-4.9657E-06

2.1417E-06

-1.6786E-06

2.4027E-06

-8.6650E-07

1.6196E-06

S2

-4.3148E-05

-3.4673E-05

-2.9923E-05

-2.0794E-05

-1.4229E-05

-6.9790E-06

-3.3404E-06

S8

-3.6439E-05

-1.7525E-05

-1.4418E-06

-3.7373E-06

-1.3881E-06

-2.3540E-06

3.5802E-07

S9

-5.4905E-05

-1.1417E-05

-3.7064E-07

9.6465E-06

4.5315E-06

6.0175E-06

1.2848E-06

S10

2.3373E-05

2.0642E-05

1.5985E-05

9.9771E-06

6.8793E-06

3.1517E-06

2.1738E-06

S11

-9.9633E-06

1.1167E-05

-1.2306E-07

1.9364E-06

-1.4474E-07

1.2045E-06

-4.1414E-07

S12

-1.4129E-04

-4.5170E-05

-3.6224E-05

-1.4440E-05

-1.3750E-05

-9.1548E-07

-3.3782E-06

S13

-7.7109E-05

-8.2533E-05

5.2537E-06

-2.0057E-05

-9.5809E-06

8.6715E-08

-6.4429E-06

S14

-7.4465E-05

-1.2926E-04

1.8649E-04

-2.3831E-05

4.2674E-05

-4.6094E-05

4.3359E-06

S15

-1.2201E-03

-4.8743E-04

4.0398E-04

2.2370E-04

-1.8625E-04

-1.0232E-05

5.8569E-05

S16

-2.7912E-03

-2.7903E-03

1.3843E-03

8.7557E-04

-3.5809E-04

-1.5233E-04

6.9099E-05

S17

-2.7082E-03

-2.9629E-03

2.2673E-03

1.0557E-04

1.0043E-03

-1.1846E-04

-3.6947E-04

S18

6.5638E-03

-3.1126E-03

3.1708E-03

4.0802E-04

-1.2592E-03

-2.8277E-04

2.3800E-04

S19

5.3105E-03

-1.1589E-03

6.1709E-03

-2.9713E-04

4.1913E-04

-1.0056E-03

-4.0368E-04

Watch 20

Fig. 23 shows an on-axis chromatic aberration curve of the imaging lens of example four, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 24 shows astigmatism curves representing meridional field curvature and sagittal field curvature in the second state of the imaging lens of example four. Fig. 25 shows a distortion curve in the second state of the imaging lens of example four, which shows distortion magnitude values corresponding to different angles of view. Fig. 26 shows an astigmatism curve in the third state of the imaging lens of example four. Fig. 27 shows a distortion curve in the third state of the imaging lens of example four. Fig. 28 shows a chromatic aberration of magnification curve of the imaging lens of example four, which represents a deviation of different image heights on the imaging surface after light passes through the imaging lens.

As can be seen from fig. 23 to 28, the imaging lens according to example four can achieve good imaging quality.

Example five

As shown in fig. 29 to 35, an imaging lens of example five of the present application is described. Fig. 29 shows a schematic diagram of an imaging lens structure of example five.

As shown in fig. 29, the imaging lens includes, in order from the subject side to the imaging side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S22.

Table 21 shows a basic structural parameter table in the first state of the imaging lens of example five, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 21

Table 22 shows a basic structural parameter table of the second lens in the second state of the imaging lens of example five, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-550.0000	0.0700	1.41	50.0
S4	Spherical surface	-550.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.2347

TABLE 22

Table 23 shows a basic structural parameter table of the second lens in the third state of the imaging lens of example five, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	29.0000	0.0700	1.41	50.0
S4	Spherical surface	29.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.2347

TABLE 23

Table 24 shows the effective focal length of the imaging lens and the effective focal length of the second lens in three states of the imaging lens of example five.

	First state	Second state	Third state
				OBJ(mm)	2000.00	All-round	100.00
f(mm)	5.62	5.64	5.20
				f2(mm)	-	-1891.99	99.73
tan(FOV/2)*f	5.12	5.14	4.74
				f/f1	1.39	1.38	1.50
f/f3	0.66	0.66	0.61

Watch 24

Table 25 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-7.5195E-02

-1.4640E-02

-2.1124E-03

3.2517E-06

6.8685E-05

4.5349E-05

7.6009E-07

S2

-7.3708E-02

-9.8613E-03

-5.1760E-06

3.6245E-04

1.0389E-04

-2.1733E-05

-3.2018E-05

S8

-2.1313E-02

-3.7555E-03

1.6278E-03

7.8894E-05

-1.3416E-04

-1.6989E-04

-9.8575E-05

S9

-1.1497E-01

1.5630E-03

-1.9518E-03

4.9015E-04

-4.1912E-04

-1.8064E-04

-1.1407E-04

S10

-3.6691E-01

2.4956E-02

-3.8469E-03

5.2147E-04

-2.1517E-04

-1.8182E-05

3.3108E-05

S11

-3.5447E-01

2.0560E-02

-3.4146E-03

5.7238E-04

8.8377E-05

-8.0281E-05

4.5170E-05

S12

3.4112E-01

-7.5726E-02

4.1476E-03

-1.4038E-03

1.0342E-03

-2.0363E-04

-6.5999E-05

S13

1.6450E-01

-3.8532E-02

6.9305E-03

4.3862E-03

1.2663E-03

1.1800E-04

-3.6501E-04

S14

-1.1025E+00

1.5264E-02

-1.7719E-02

1.5133E-02

-3.2748E-04

8.2560E-04

-1.4123E-03

S15

-7.6150E-01

1.8706E-02

4.7098E-02

-2.0488E-02

5.6504E-03

-1.8966E-03

1.2681E-03

S16

-1.2270E+00

8.3997E-03

9.6675E-02

-4.8505E-02

8.5787E-03

4.7590E-03

1.5259E-03

S17

-1.5297E+00

-8.3127E-03

-8.6165E-04

-2.0468E-02

1.7636E-02

3.1689E-03

-3.9192E-03

S18

-2.8821E+00

8.7367E-01

-3.7896E-01

1.2720E-01

-1.4295E-02

-4.5731E-03

-8.3831E-03

S19

-6.2582E+00

1.2473E+00

-3.3441E-01

1.1825E-01

-6.8408E-02

3.1664E-02

-2.2665E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

5.6274E-06

-4.3827E-06

2.3435E-06

-1.8061E-06

2.6336E-06

-7.8298E-07

1.2213E-06

S2

-4.1867E-05

-3.1697E-05

-2.9355E-05

-1.9215E-05

-1.3601E-05

-5.9395E-06

-3.0604E-06

S8

-4.1026E-05

-2.0305E-05

-1.8370E-06

-3.0568E-06

-2.0909E-06

-1.9529E-06

4.6828E-07

S9

-5.3082E-05

-1.1968E-05

1.4315E-06

1.2880E-05

4.6906E-06

6.9355E-06

1.8902E-06

S10

2.5081E-05

2.0118E-05

1.4386E-05

1.0459E-05

4.2979E-06

3.1829E-06

1.9283E-06

S11

-1.4243E-05

1.1227E-05

-2.0742E-06

1.8863E-06

-2.3957E-06

1.8898E-06

-4.9812E-07

S12

-1.3141E-04

-2.9199E-05

-2.7470E-05

-1.1398E-05

-1.3389E-05

-6.1581E-08

-2.6124E-06

S13

-9.6584E-05

-5.4088E-05

1.2273E-05

-1.4784E-05

-1.0663E-05

7.9905E-07

-3.3424E-06

S14

-2.1110E-04

3.0241E-05

2.1328E-04

-2.8214E-05

5.7253E-06

-3.5276E-05

4.6519E-06

S15

-2.0100E-03

4.8750E-04

3.4063E-04

7.3292E-05

-1.2770E-04

6.2369E-05

-4.4524E-05

S16

-5.3184E-03

-1.1360E-03

2.6373E-03

4.9402E-04

-7.3783E-04

-6.5062E-05

5.5541E-05

S17

-2.9527E-03

-2.8780E-03

2.6549E-03

3.3729E-04

1.0423E-03

-1.4117E-04

-3.8385E-04

S18

7.8599E-03

-3.2615E-03

2.8728E-03

7.2435E-04

-1.4039E-03

-3.7369E-04

3.3057E-04

S19

7.0078E-03

7.9215E-04

6.2057E-03

-9.9795E-04

-4.4351E-04

-1.2407E-03

-1.9447E-04

TABLE 25

Fig. 30 shows an on-axis chromatic aberration curve of the imaging lens of example five, which shows the deviation of the convergent focal points of light rays of different wavelengths after passing through the imaging lens. Fig. 31 shows astigmatism curves representing meridional field curvature and sagittal field curvature in the second state of the imaging lens of example five. Fig. 32 shows a distortion curve in the second state of the imaging lens of example five, which shows distortion magnitude values corresponding to different angles of view. Fig. 33 shows an astigmatism curve in the third state of the imaging lens of example five. Fig. 34 shows a distortion curve in the third state of the imaging lens of example five. Fig. 35 shows a chromatic aberration of magnification curve of the imaging lens of example five, which represents a deviation of different image heights on the imaging surface after light passes through the imaging lens.

As can be seen from fig. 30 to 35, the imaging lens according to example five can achieve good imaging quality.

Example six

As shown in fig. 36 to 42, an imaging lens of example six of the present application is described. Fig. 36 shows a schematic diagram of an imaging lens structure of example six.

As shown in fig. 36, the imaging lens includes, in order from the subject side to the imaging side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S22.

Table 26 shows a basic structural parameter table in the first state of the imaging lens of example six, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Watch 26

Table 27 shows a basic structural parameter table of the second lens in the second state of the imaging lens of example six, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-550.0000	0.0700	1.41	50.0
S4	Spherical surface	-550.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.3301

Watch 27

Table 28 shows a basic structural parameter table of the second lens in the third state of the imaging lens of example six, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	29.0000	0.0700	1.41	50.0
S4	Spherical surface	29.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.3301

Watch 28

Table 29 shows the effective focal length of the image pickup lens and the effective focal length of the second lens in three states of the image pickup lens of example six.

	First state	Second state	Third state
				OBJ(mm)	2000.00	All-round	100.00
f(mm)	5.67	5.69	5.23
				f2(mm)	-	-1891.99	99.73
tan(FOV/2)*f	5.26	5.28	4.85
				f/f1	1.33	1.33	1.44
f/f3	0.60	0.61	0.56

Watch 29

Table 30 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Watch 30

Fig. 37 shows an on-axis chromatic aberration curve of the imaging lens of example six, which indicates that light rays of different wavelengths are out of focus after passing through the imaging lens. Fig. 38 shows astigmatism curves representing meridional field curvature and sagittal field curvature in the second state of the imaging lens of example six. Fig. 39 shows a distortion curve in the second state of the imaging lens of example six, which shows distortion magnitude values corresponding to different angles of view. Fig. 40 shows an astigmatism curve in the third state of the imaging lens of example six. Fig. 41 shows a distortion curve in the third state of the imaging lens of example six. Fig. 42 shows a chromatic aberration of magnification curve of the imaging lens of example six, which represents a deviation of different image heights on the imaging surface after light passes through the imaging lens.

As can be seen from fig. 37 to 42, the imaging lens according to example six can achieve good imaging quality.

Example seven

As shown in fig. 43 to 49, an imaging lens of a seventh example of the present application is described. Fig. 43 shows a schematic diagram of an imaging lens structure of example seven.

As shown in fig. 43, the imaging lens includes, in order from the subject side to the imaging side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S22.

Table 31 shows a basic structural parameter table in the first state of the imaging lens of example seven, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Watch 31

Table 32 shows a basic structural parameter table of the second lens in the second state of the imaging lens of example seven, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-550.0000	0.0700	1.41	50.0
S4	Spherical surface	-550.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.2926

Watch 32

Table 33 shows a basic structural parameter table of the second lens in the third state of the imaging lens of example seven, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	29.0000	0.0700	1.41	50.0
S4	Spherical surface	29.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.2926

Watch 33

Table 34 shows the effective focal length of the imaging lens and the effective focal length of the second lens in three states of the imaging lens of example seven.

	First state	Second state	Third state
				OBJ(mm)	2000.00	All-round	100.00
f(mm)	5.68	5.71	5.23
				f2(mm)	-	-1891.99	99.73
tan(FOV/2)*f	5.26	5.28	4.84
				f/f1	1.35	1.34	1.47
f/f3	0.67	0.68	0.62

Watch 34

Table 35 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example seven, wherein each of the aspherical mirror surface types can be defined by formula (1) given in example one above.

Watch 35

Fig. 44 shows an on-axis chromatic aberration curve of the imaging lens of example seven, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 45 shows astigmatism curves representing meridional field curvature and sagittal field curvature in the second state of the imaging lens of example seven. Fig. 46 shows a distortion curve in the second state of the imaging lens of example seven, which represents distortion magnitude values corresponding to different angles of view. Fig. 47 shows an astigmatism curve in the third state of the imaging lens of example seven. Fig. 48 shows a distortion curve in the third state of the imaging lens of example seven. Fig. 49 shows a chromatic aberration of magnification curve of the imaging lens of example seven, which represents a deviation of different image heights on the imaging surface after light passes through the imaging lens.

As can be seen from fig. 44 to 49, the imaging lens according to example seven can achieve good image quality.

To sum up, examples one to seven respectively satisfy the relationships shown in table 36.

Table 36 table 37 shows effective focal lengths f1, f3 to f8 and TTL, ImgH, Fno of the respective lenses of example one to example seven.

Example parameters	1	2	3	4	5	6	7
								f1(mm)	7.45	7.88	8.19	7.82	7.80	7.55	7.68
f3(mm)	11.38	8.19	8.14	8.36	8.49	9.38	8.43
								f4(mm)	-17.06	-11.27	-10.54	-11.10	-11.23	-12.95	-11.72
f5(mm)	-37.87	-27.12	-32.63	-29.38	-29.72	-85.63	-42.24
								f6(mm)	8.70	12.12	19.14	10.76	11.37	7.89	11.53
f7(mm)	-28.29	312.05	32.00	-143.38	-477.50	-15.46	-59.67
								f8(mm)	-5.39	-6.35	-6.68	-6.35	-6.45	-5.35	-5.33
TTL(mm)	7.30	7.32	7.75	7.43	7.43	7.30	7.42
								ImgH(mm)	5.30	5.20	5.30	5.20	5.20	5.30	5.30
Fno	1.90	1.88	1.90	1.90	1.90	1.90	1.90

Watch 37

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the above-described image pickup lens.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of 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 this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An imaging lens, comprising:

a first lens having an optical power;

a second lens having a focal power, the focal length of the second lens being variable;

the surface, close to the image side, of the third lens is a convex surface;

a fourth lens having an optical power;

a fifth lens with optical power, wherein the surface of the fifth lens close to the object side is a concave surface, and the surface of the fifth lens close to the image side is a convex surface;

a sixth lens with positive focal power, wherein the surface of the sixth lens close to the object side is a concave surface;

a seventh lens having optical power;

an eighth lens having optical power;

the effective focal length f of the image pickup lens and the effective focal length f1 of the first lens satisfy that: 0< | f/f1 | < 3; the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the imaging lens satisfies ImgH > 5.

2. The imaging lens according to claim 1, wherein an effective half aperture DT12 of a surface of the first lens close to the image side and an effective half aperture DT31 of a surface of the third lens close to the object side satisfy: DT31/DT12 <1.

3. The imaging lens according to claim 1, wherein an effective half aperture DT11 of a surface of the first lens close to the object side, an effective half aperture DT21 of a surface of the third lens close to the object side, and an effective half aperture DT32 of a surface of the third lens close to the image side satisfy: (DT21+ DT11)/DT32< 2.5.

4. The imaging lens according to claim 1, wherein a minimum focal length fmin of the imaging lens and a maximum focal length fmax of the imaging lens satisfy: (fmax/fmin) 10> 8.

5. A camera lens according to claim 1, wherein a radius of curvature R3 of a surface of the second lens element on the object side is variable and satisfies | R3 | > 29 mm.

6. The imaging lens of claim 1, wherein an on-axis distance TTL from a surface of the first lens close to the object side to an imaging plane of the imaging lens and a half ImgH of a diagonal length of an effective pixel region on the imaging plane satisfy: TTL/ImgH < 1.5.

7. The imaging lens according to claim 1, wherein a central thickness CT7 of the seventh lens on an optical axis and a central thickness CT8 of the eighth lens on the optical axis satisfy: 0.9< CT8/CT 7< 1.5.

8. The imaging lens according to claim 1, wherein a center thickness CT6 of the sixth lens on an optical axis and an edge thickness ET6 of the sixth lens satisfy: 0.5< ET6/CT 6< 2.

9. The imaging lens according to claim 1, wherein an effective semi-aperture DT11 of a surface of the first lens close to the object side and an effective semi-aperture DT61 of a surface of the sixth lens close to the object side satisfy: 1.4< DT61/DT11< 2.1.

10. An imaging lens, comprising:

a first lens having an optical power;

the surface, close to the image side, of the third lens is a convex surface;

a fourth lens having an optical power;

a seventh lens having optical power;

an eighth lens having optical power;

wherein an effective focal length f4 of the fourth lens, an effective focal length f6 of the sixth lens and an effective focal length f8 of the eighth lens satisfy: 0< | (f6+ f4)/f8 | 2, and ImgH, which is a half of the diagonal length of the effective pixel area on the imaging plane of the imaging lens, satisfies ImgH > 5.