CN114594571A

CN114594571A - Camera lens

Info

Publication number: CN114594571A
Application number: CN202210234285.XA
Authority: CN
Inventors: 郭彦玲; 邢天祥; 黄林; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2022-06-07

Abstract

The invention provides a camera lens. The image pickup lens sequentially includes from an object side to an image side: a first lens having an optical power; a second lens with a focal power, wherein the surface facing the object side is a concave surface, and the surface facing the image side is a convex surface; a third lens having an optical power; a fourth lens having a power, a surface facing the object side of the fourth lens being a concave surface, and a surface facing the image side of the fourth lens being a concave surface; a fifth lens with positive refractive power, the surface facing the object side of the fifth lens is a convex surface, and the surface facing the image side of the fifth lens is a convex surface; a sixth lens having a refractive power, a surface of which facing the object side is a concave surface; the on-axis distance TTL from the surface of the first lens facing the object side to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH < 1.2; the central thickness CT5 of the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy that: 1.0< CT5/T56< 2.5. The invention solves the problem that the camera lens in the prior art is difficult to realize due to the ultra-thin and ultra-small head.

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 diversified development of the industry, short videos and e-commerce are well known by people, a portable electronic product is usually adopted in the fields for shooting, and a camera lens of the portable electronic product plays a decisive role in shooting quality, wherein the effect played by a front camera is never smaller than that of a rear camera, and the front camera not only can meet the requirements of self-shooting and video conversation of a user, but also is a necessary condition of a face recognition function. In recent years, bang screen, lifting full-face screen, water drop screen and punching screen are all designed to further improve the screen occupation ratio and the attractiveness of the mobile phone.

Under the background that the smart phone generally pursues the high screen ratio, the volume of the front camera is inevitably smaller.

That is, the imaging lens in the related art has a problem that it is difficult to realize an ultra-thin and ultra-small head.

Disclosure of Invention

The invention mainly aims to provide a camera lens, which aims to solve the problems that the camera lens in the prior art is ultrathin and the realization of an ultra-small head is difficult.

In order to achieve the above object, according to an aspect of the present invention, there is provided an imaging lens comprising, in order from an object side to an image side: a first lens having an optical power; a second lens with a focal power, wherein the surface facing the object side is a concave surface, and the surface facing the image side is a convex surface; a third lens having an optical power; a fourth lens having a power, a surface facing the object side of the fourth lens being a concave surface, and a surface facing the image side of the fourth lens being a concave surface; a fifth lens with positive refractive power, the surface facing the object side of the fifth lens is a convex surface, and the surface facing the image side of the fifth lens is a convex surface; a sixth lens having a refractive power, a surface of the sixth lens facing the object side being a concave surface; the on-axis distance TTL from the surface of the first lens facing the object side to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH < 1.2; the central thickness CT5 of the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy that: 1.0< CT5/T56< 2.5.

Further, the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens satisfy: f/EPD is less than or equal to 2.6.

Further, the maximum field angle FOV of the imaging lens satisfies: 90 < FOV < 100.

Further, the effective focal length f1 of the first lens and the effective focal length f of the image pickup lens satisfy: f1/f is more than 1.0 and less than 2.0.

Further, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy the following condition: -3.5 < f4/f5 < -2.0.

Further, the effective focal length f6 of the sixth lens and the effective focal length f of the image pickup lens satisfy: -3.0 < f/f 6< -1.0.

Further, a curvature radius R1 of a surface of the first lens facing the object side and a curvature radius R2 of a surface of the first lens facing the image side satisfy: 1.5 < (R2+ R1)/(R2-R1) < 2.5.

Further, a curvature radius R3 of a surface of the second lens facing the object side and an effective focal length f of the imaging lens satisfy: -2.0 < R3/f < -1.0.

Further, the curvature radius R8 of the surface of the fourth lens facing the image side, the curvature radius R9 of the surface of the fifth lens facing the object side, and the effective focal length f of the imaging lens satisfy: 1.5 < (R8+ R9)/f < 2.5.

Further, a curvature radius R10 of a surface of the fifth lens facing the image side and a curvature radius R11 of a surface of the sixth lens facing the object side satisfy: 1.0< R11/R10 < 2.0.

Further, the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens satisfy: 1.0< ET6/ET5 < 3.5.

Further, an on-axis distance SAG41 between an intersection point of a surface of the fourth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fourth lens facing the object side and an on-axis distance SAG42 between an intersection point of the surface of the fourth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fourth lens facing the image side satisfy: 0< SAG41/SAG42 < 1.5.

Further, an on-axis distance SAG61 between an intersection point of a surface of the sixth lens facing the object side and the optical axis and an effective radius vertex of the surface of the sixth lens facing the object side and an on-axis distance SAG62 between an intersection point of the surface of the sixth lens facing the image side and the optical axis and an effective radius vertex of the surface of the sixth lens facing the image side satisfy: 0.5 < SAG61/SAG62 < 2.0.

Further, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the image pickup lens satisfy the following condition: f12/f is more than 1.0 and less than 3.0.

Further, the combined focal length f56 of the fifth lens and the sixth lens and the effective focal length f of the image pickup lens satisfy: f56/f is more than 0.5 and less than 1.5.

Further, the abbe number V5 of the fifth lens satisfies: 30 < V5 < 40.

According to another aspect of the present invention, there is provided an imaging lens including, in order from an object side to an image side: a first lens having an optical power; a second lens with a focal power, wherein the surface facing the object side is a concave surface, and the surface facing the image side is a convex surface; a third lens having an optical power; a fourth lens having a power, a surface facing the object side of the fourth lens being a concave surface, and a surface facing the image side of the fourth lens being a concave surface; a fifth lens with positive focal power, wherein the surface facing the object side of the fifth lens is a convex surface, and the surface facing the image side of the fifth lens is a convex surface; a sixth lens having a refractive power, a surface of which facing the object side is a concave surface; wherein, the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens satisfy: 1.0< ET6/ET5 < 3.5; the central thickness CT5 of the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy that: 1.0< CT5/T56< 2.5.

Further, an on-axis distance TTL from a surface of the first lens element facing the object side to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.2; the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following requirements: f/EPD is less than or equal to 2.6.

Further, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -3.5 < f4/f5 < -2.0.

Furthermore, the curvature radius R8 of the surface facing the image side of the fourth lens, the curvature radius R9 of the surface facing the object side of the fifth lens and the effective focal length f of the imaging lens satisfy the following conditions: 1.5 < (R8+ R9)/f < 2.5.

Further, abbe number V5 of the fifth lens satisfies: 30 < V5 < 40.

By applying the technical scheme of the invention, the camera lens sequentially comprises a first lens with focal power, a second lens with focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with positive focal power and a sixth lens with focal power from the object side to the image side; the surface of the second lens facing the object side is a concave surface, and the surface facing the image side is a convex surface; the surface of the fourth lens facing the object side is a concave surface, and the surface facing the image side is a concave surface; the surface of the fifth lens facing the object side is a convex surface, and the surface facing the image side is a convex surface; the surface of the sixth lens facing the object side is a concave surface; the on-axis distance TTL from the surface of the first lens facing the object side to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH < 1.2; the central thickness CT5 of the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy that: 1.0< CT5/T56< 2.5.

The object-side surface and the image-side surface of the second lens are concave and convex respectively, so that the FOV of the system field angle is improved, light rays can be better converged, and the image quality of the camera lens is improved. The surface of the fourth lens facing the object side is a concave surface, and the surface facing the image side is a concave surface, so that the central view field light rays have good convergence capability, and the spherical aberration of the system is favorably improved. And the focal power and the surface type of the fifth lens are reasonably planned, so that the total length of the system is shortened, and the miniaturization of the camera lens is realized. By setting the surface of the sixth lens facing the object side to be a concave surface, the low-order aberration of the system can be effectively balanced, so that the system has better imaging quality and processability. The low-order aberration of the control system is effectively balanced and the imaging quality is improved by reasonably controlling the positive and negative distribution of the focal power of each lens and the curvature of the lens surface. The camera lens has the advantages that the camera lens is miniaturized, ultrathin and small in head by restraining the ratio of the on-axis distance TTL from the surface, facing the object side, of the first lens to the imaging surface to the half ImgH of the diagonal length of the effective pixel area on the imaging surface. Through the ratio of the central thickness CT5 of the fifth lens on the optical axis to the air space T56 of the fifth lens and the sixth lens on the optical axis, the size distribution of the fifth lens is uniform, the assembly stability is ensured, the aberration of the whole camera lens is reduced, the total length of the camera lens is shortened, and the miniaturization is ensured.

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 5 respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 1;

fig. 6 is a schematic view showing a configuration of an imaging lens according to a second example of the present invention;

fig. 7 to 10 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 6, respectively;

fig. 11 is a schematic view showing a configuration of an imaging lens according to a third example of the present invention;

fig. 12 to 15 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 11, respectively;

fig. 16 is a schematic view showing a configuration of an imaging lens of example four of the present invention;

fig. 17 to 20 respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 16;

fig. 21 is a schematic view showing a configuration of an imaging lens of example five of the present invention;

fig. 22 to 25 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens in fig. 21;

fig. 26 is a schematic diagram showing a configuration of an imaging lens of example six of the present invention;

fig. 27 to 30 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens in fig. 26.

Wherein the figures include the following reference numerals:

STO, stop; e1, a first lens; s1, the object-side surface of the first lens; s2, the surface of the first lens facing the image side; e2, a second lens; s3, the object-side surface of the second lens; s4, the surface of the second lens facing the image side; e3, third lens; s5, the object-side surface of the third lens; s6, an image-side surface of the third lens element; e4, fourth lens; s7, the object-side surface of the fourth lens; s8, the surface of the fourth lens facing the image side; e5, fifth lens; s9, the object-side surface of the fifth lens; s10, the surface of the fifth lens facing the image side; e6, sixth lens; s11, the object-side surface of the sixth lens element; s12, the surface of the sixth lens facing the image side; e7, optical filters; s13, the surface of the filter facing the object side; s14, the surface of the filter facing the image side; and S15, 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, 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 the 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 surface of each lens close to the object side is the surface of the lens facing to the object side, and the surface of each lens close to the image side is called the surface of the lens facing to the image side. The determination of the surface shape in the paraxial region can be made by determining whether or not the surface shape is concave or convex using an R value (R denotes a radius of curvature of the paraxial region, and usually denotes an R value in a lens database (lens data) in optical software) according to a determination method by a person ordinarily skilled in the art. With respect to the surface facing the object side, a convex surface is determined when the R value is positive, and a concave surface is determined when the R value is negative; on the surface facing the image side, the image is determined to be concave when the R value is positive, and convex when the R value is negative.

The invention provides a camera lens, aiming at solving the problems that the camera lens in the prior art is ultrathin and the realization of a small head is difficult.

Example one

As shown in fig. 1 to 30, the imaging lens includes, in order from an object side to an image side, a first lens having optical power, a second lens having optical power, a third lens having optical power, a fourth lens having optical power, a fifth lens having positive optical power, and a sixth lens having optical power; the surface of the second lens facing the object side is a concave surface, and the surface facing the image side is a convex surface; the surface of the fourth lens facing the object side is a concave surface, and the surface facing the image side is a concave surface; the surface of the fifth lens facing the object side is a convex surface, and the surface facing the image side is a convex surface; the surface of the sixth lens facing the object side is a concave surface; the on-axis distance TTL from the surface of the first lens facing the object side to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH < 1.2; the central thickness CT5 of the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy that: 1.0< CT5/T56< 2.5.

Preferably, 1.3< CT5/T56< 2.4.

In this embodiment, the effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy: f/EPD is less than or equal to 2.6. Satisfying the conditional expression can make the F number of the system less than 2.6, and can realize the characteristic of large aperture.

In the present embodiment, the maximum field angle FOV of the imaging lens satisfies: 90 < FOV < 100. By restricting the maximum field angle FOV of the imaging lens to be in the range of 90 ° to 100 °, the imaging range of the imaging lens can be effectively controlled. Preferably 91 ° < FOV < 98 °.

In the present embodiment, the effective focal length f1 of the first lens and the effective focal length f of the imaging lens satisfy: f1/f is more than 1.0 and less than 2.0. The imaging lens has the long-focus characteristic, the third-order spherical aberration and the fifth-order spherical aberration of the first lens are small in contribution, the residual spherical aberration generated by the rear lens can be balanced, the axial aberration is small, and good imaging quality can be obtained.

In the present embodiment, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -3.5 < f4/f5 < -2.0. The condition is satisfied, and the off-axis aberration of the system is balanced. Preferably, -3.1 < f4/f5 < -2.2.

In the present embodiment, the effective focal length f6 of the sixth lens and the effective focal length f of the imaging lens satisfy: -3.0 < f/f 6< -1.0. Satisfying this conditional expression, the deflection angle of light can be reduced, thereby reducing the sensitivity of the optical system. Preferably, -2.8 < f/f 6< -1.2.

In this embodiment, a radius of curvature R1 of the surface of the first lens facing the object side and a radius of curvature R2 of the surface of the first lens facing the image side satisfy: 1.5 < (R2+ R1)/(R2-R1) < 2.5. The method can effectively control the refraction angle of the system light beam on the first lens and realize the good processing characteristic of the system. Preferably 1.8 < (R2+ R1)/(R2-R1) < 2.3.

In this embodiment, a curvature radius R3 of a surface of the second lens facing the object side and an effective focal length f of the imaging lens satisfy: -2.0 < R3/f < -1.0. The method meets the conditional expression, can effectively control the astigmatism of the system, and further can improve the imaging quality of the off-axis field of view. Preferably, -2.0 < R3/f < -1.2.

In this embodiment, the curvature radius R8 of the surface of the fourth lens facing the image side, the curvature radius R9 of the surface of the fifth lens facing the object side, and the effective focal length f of the imaging lens satisfy: 1.5 < (R8+ R9)/f < 2.5. Satisfying the conditional expression, the optical distortion can be reduced, and better imaging quality is ensured. Preferably 1.7 < (R8+ R9)/f < 2.3.

In this embodiment, a radius of curvature R10 of the surface of the fifth lens facing the image side and a radius of curvature R11 of the surface of the sixth lens facing the object side satisfy: 1.0< R11/R10 < 2.0. The condition formula is satisfied, and the on-axis aberration generated by the camera lens can be effectively balanced. Preferably, 1.0< R11/R10 < 1.8.

In the present embodiment, the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens satisfy: 1.0< ET6/ET5 < 3.5. The space occupation ratio of the seventh lens can be reasonably controlled, the assembly process of the lenses is favorably ensured, and the miniaturization of the camera lens is realized. Preferably 1.2 < ET6/ET5 < 3.5.

In this embodiment, an on-axis distance SAG41 between an intersection point of a surface of the fourth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fourth lens facing the object side and an on-axis distance SAG42 between an intersection point of the surface of the fourth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fourth lens facing the image side satisfy: 0< SAG41/SAG42 < 1.5. The condition is satisfied, and the relation between the miniaturization of the module and the relative illumination of the off-axis field is favorably realized in a better balanced manner. Preferably 0.2 < SAG41/SAG42 < 1.4.

In this embodiment, an on-axis distance SAG61 between an intersection point of a surface of the sixth lens facing the object side and the optical axis and an effective radius vertex of the surface of the sixth lens facing the object side and an on-axis distance SAG62 between an intersection point of the surface of the sixth lens facing the image side and the optical axis and an effective radius vertex of the surface of the sixth lens facing the image side satisfy: 0.5 < SAG61/SAG62 < 2.0. The condition is satisfied, and the relationship between the miniaturization of the module and the relative illumination of the off-axis field of view is favorably realized in a better balanced manner. Preferably, 0.8 < SAG61/SAG62 < 1.7.

In the embodiment, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the imaging lens satisfy: f12/f is more than 1.0 and less than 3.0. The conditional expression is satisfied, the contribution range of the focal power can be reasonably controlled, and meanwhile, the contribution rate of the secondary spherical aberration of the first lens can be reasonably controlled, so that the positive focal power of the first lens can be reasonably balanced. Preferably, 1.3< f12/f < 2.9.

In the present embodiment, the combined focal length f56 of the fifth lens and the sixth lens and the effective focal length f of the imaging lens satisfy: f56/f is more than 0.5 and less than 1.5. When the conditional expression is satisfied, the contribution of the aberration of the two lenses can be controlled to balance with the aberration generated by the front-end optical element, so that the system aberration is in a reasonable level state. Preferably, 0.8 < f56/f < 1.2.

In the present embodiment, abbe number V5 of the fifth lens satisfies: 30 < V5 < 40. The abbe number V5 of the fifth lens is controlled, so that chromatic aberration can be corrected, and the imaging quality of the camera lens can be improved.

Example two

As shown in fig. 1 to 30, the imaging lens includes, in order from an object side to an image side: a first lens having an optical power; a second lens with a focal power, wherein the surface facing the object side is a concave surface, and the surface facing the image side is a convex surface; a third lens having an optical power; a fourth lens having a power, a surface facing the object side of the fourth lens being a concave surface, and a surface facing the image side of the fourth lens being a concave surface; a fifth lens with positive refractive power, the surface facing the object side of the fifth lens is a convex surface, and the surface facing the image side of the fifth lens is a convex surface; a sixth lens having a refractive power, a surface of the sixth lens facing the object side being a concave surface; wherein, the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens satisfy: 1.0< ET6/ET5 < 3.5; the central thickness CT5 of the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy that: 1.0< CT5/T56< 2.5.

Preferably, 1.3< CT5/T56< 2.4.

Preferably 1.2 < ET6/ET5 < 3.5.

The object-side surface and the image-side surface of the second lens are concave and convex respectively, so that the FOV of the system field angle is improved, light rays can be better converged, and the image quality of the camera lens is improved. The surface of the fourth lens facing the object side is a concave surface, and the surface facing the image side is a concave surface, so that the central view field light rays have good convergence capability, and the spherical aberration of the system is favorably improved. And the focal power and the surface type of the fifth lens are reasonably planned, so that the total length of the system is shortened, and the miniaturization of the camera lens is realized. By setting the surface of the sixth lens facing the object side to be a concave surface, the low-order aberration of the system can be effectively balanced, so that the system has better imaging quality and processability. The low-order aberration of the control system is effectively balanced and the imaging quality is improved by reasonably controlling the positive and negative distribution of the focal power of each lens and the curvature of the lens surface. By constraining the relation between the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens, the space occupation ratio of the seventh lens can be reasonably controlled, the assembly process of the lenses is favorably ensured, and the miniaturization of the camera lens is realized. Through the ratio of the central thickness CT5 of the fifth lens on the optical axis to the air space T56 of the fifth lens and the sixth lens on the optical axis, the size distribution of the fifth lens is uniform, the assembly stability is ensured, the aberration of the whole camera lens is reduced, the total length of the camera lens is shortened, and the miniaturization is ensured.

In this embodiment, an on-axis distance TTL from a surface of the first lens element facing the object side to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.2. The characteristics of miniaturization, ultrathin and small head of the camera lens are realized simultaneously by restricting the ratio of the axial distance TTL from the surface of the first lens facing the object side to the imaging surface to the half of the diagonal length ImgH of the effective pixel area on the imaging surface.

In the present embodiment, the effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy: f/EPD is less than or equal to 2.6. Satisfying the conditional expression, the F number of the system is less than 2.6, and the characteristic of large aperture can be realized.

In this embodiment, an on-axis distance SAG61 between an intersection point of a surface of the sixth lens facing the object side and the optical axis and an effective radius vertex of the surface of the sixth lens facing the object side and an on-axis distance SAG62 between an intersection point of the surface of the sixth lens facing the image side and the optical axis and an effective radius vertex of the surface of the sixth lens facing the image side satisfy: 0.5 < SAG61/SAG62 < 2.0. The condition is satisfied, and the relation between the miniaturization of the module and the relative illumination of the off-axis field is favorably realized in a better balanced manner. Preferably 0.8 < SAG61/SAG62 < 1.7.

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

The imaging lens in the present application may employ a plurality of lenses, for example, the above-described six lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between the lenses and the like, the aperture of the camera lens can be effectively increased, the sensitivity of the lens is reduced, and the machinability of the lens is improved, so that the camera lens is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The camera lens further has the advantages of being ultrathin and good in imaging quality, and the requirement for miniaturization of intelligent electronic products can be met.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens has the characteristics 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 lens center to the lens periphery, an aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses making up the camera lens can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the imaging lens is not limited to including six lenses. The camera lens may also include other numbers of lenses, as desired.

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 six is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 5, 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 imaging lens includes, in order from an object side to an image 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 filter E7, and an image plane S15.

The first lens E1 has positive power, and its object-side surface S1 is convex and its image-side surface S2 is concave. The second lens E2 has negative power, the object-facing surface S3 of the second lens is concave, and the image-facing surface S4 of the second lens is convex. The third lens E3 has positive power, and its object-side surface S5 is a convex surface, and its image-side surface S6 is a convex surface. The fourth lens E4 has negative power, and its object-side surface S7 is concave, and its image-side surface S8 is concave. The fifth lens E5 has positive power, and the object-facing surface S9 of the fifth lens is a convex surface, and the image-facing surface S10 of the fifth lens is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is concave, and its image-side surface S12 is concave. The filter E7 has a surface S13 facing the object side of the filter and a surface S14 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens is 3.15mm, the maximum half field angle Semi-FOV of the imaging lens is 46.0 °, the total length TTL of the imaging lens is 4.05mm, and the image height ImgH is 3.36 mm.

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

TABLE 1

In an example one, a surface facing the object side and a surface facing the image side of any one of the first lens E1 through the sixth lens E6 are aspheric, and the surface type of each aspheric lens can be defined by, but is 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 2 below gives the high-order coefficient 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-S12 in example one.

TABLE 2

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 of the imaging lens of the first example, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the imaging lens of the first example, which show distortion magnitude values corresponding to different angles of view. Fig. 5 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 formation plane after the light passes through the imaging lens.

As can be seen from fig. 2 to 5, the imaging lens according to the first example can achieve good imaging quality.

Example two

As shown in fig. 6 to 10, an imaging lens of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 6 shows a schematic diagram of the imaging lens structure of example two.

As shown in fig. 6, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

The first lens E1 has positive power, and its object-side surface S1 is convex and its image-side surface S2 is concave. The second lens E2 has negative power, the object-facing surface S3 of the second lens is concave, and the image-facing surface S4 of the second lens is convex. The third lens E3 has positive power, and its object-side surface S5 is concave, and its image-side surface S6 is convex. The fourth lens E4 has negative power, and its object-side surface S7 is concave, and its image-side surface S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is a convex surface, and its image-side surface S10 is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is concave, and its image-side surface S12 is concave. The filter E7 has a surface S13 facing the object side of the filter and a surface S14 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens is 2.94mm, the maximum half field angle Semi-FOV of the imaging lens is 46.2 °, the total length TTL of the imaging lens is 3.89mm, and the image height ImgH is 3.26 mm.

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

TABLE 3

Table 4 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.

TABLE 4

Fig. 7 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. 8 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example two. Fig. 9 shows distortion curves of the imaging lens of example two, which show values of distortion magnitudes corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the imaging lens of the second 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. 7 to 10, the imaging lens according to example two can achieve good imaging quality.

Example III

As shown in fig. 11 to 15, an imaging lens of example three of the present application is described. Fig. 11 shows a schematic diagram of an imaging lens structure of example three.

As shown in fig. 11, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

The first lens E1 has positive power, and its object-side surface S1 is convex and its image-side surface S2 is concave. The second lens E2 has negative power, the object-facing surface S3 of the second lens is concave, and the image-facing surface S4 of the second lens is convex. The third lens E3 has positive power, and its object-side surface S5 is convex and its image-side surface S6 is concave. The fourth lens E4 has negative power, and its object-side surface S7 is concave, and its image-side surface S8 is concave. The fifth lens E5 has positive power, and the object-facing surface S9 of the fifth lens is a convex surface, and the image-facing surface S10 of the fifth lens is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is concave, and its image-side surface S12 is concave. The filter E7 has a surface S13 facing the object side of the filter and a surface S14 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens is 2.95mm, the maximum half field angle Semi-FOV of the imaging lens is 47.4 °, the total length TTL of the imaging lens is 4.05mm, and the image height ImgH is 3.38 mm.

Table 5 shows a basic structural parameter table of the imaging lens of example three, in which the units of the radius of curvature, the thickness/distance, and the radius of curvature are all millimeters (mm).

TABLE 5

Table 6 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.

TABLE 6

Fig. 12 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. 13 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example three. Fig. 14 shows distortion curves of the imaging lens of example three, which show distortion magnitude values corresponding to different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the imaging lens of example three, 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. 12 to 15, the imaging lens according to the third example can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an imaging lens of the present example four is described. Fig. 16 shows a schematic diagram of an imaging lens structure of example four.

As shown in fig. 16, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

The first lens E1 has positive power, and its object-side surface S1 is convex and its image-side surface S2 is concave. The second lens E2 has negative power, the object-facing surface S3 of the second lens is concave, and the image-facing surface S4 of the second lens is convex. The third lens E3 has positive power, and its object-side surface S5 is a convex surface, and its image-side surface S6 is a convex surface. The fourth lens E4 has negative power, and its object-side surface S7 is concave, and its image-side surface S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is a convex surface, and its image-side surface S10 is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is a concave surface and its image-side surface S12 is a convex surface. The filter E7 has a surface S13 facing the object side of the filter and a surface S14 facing the image side of the filter. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens is 2.54mm, the maximum half field angle Semi-FOV of the imaging lens is 48.5 °, the total length TTL of the imaging lens is 3.89mm, and the image height ImgH is 3.26 mm.

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

TABLE 7

Table 8 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.

TABLE 8

Fig. 17 shows on-axis chromatic aberration curves of the imaging lens of example four, which indicate deviation of the convergence focus of light rays of different wavelengths after passing through the imaging lens. Fig. 18 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example four. Fig. 19 shows distortion curves of the imaging lens of example four, which show values of distortion magnitudes corresponding to different angles of view. Fig. 20 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. 17 to 20, the imaging lens according to example four can achieve good imaging quality.

Example five

As shown in fig. 21 to 25, an imaging lens of example five of the present application is described. Fig. 21 shows a schematic diagram of an imaging lens structure of example five.

As shown in fig. 21, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

The first lens E1 has positive power, and its object-side surface S1 is convex and its image-side surface S2 is concave. The second lens E2 has negative power, the object-facing surface S3 of the second lens is concave, and the image-facing surface S4 of the second lens is convex. The third lens E3 has positive power, and its object-side surface S5 is convex and its image-side surface S6 is concave. The fourth lens E4 has negative power, and its object-side surface S7 is concave, and its image-side surface S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is a convex surface, and its image-side surface S10 is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is concave, and its image-side surface S12 is convex. The filter E7 has a surface S13 facing the object side of the filter and a surface S14 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens is 2.55mm, the maximum half field angle Semi-FOV of the imaging lens is 48.3 °, the total length TTL of the imaging lens is 3.81mm, and the image height ImgH is 3.20 mm.

Table 9 shows a basic structural parameter table of the imaging lens of example five, in which the units of the radius of curvature, the thickness/distance, and the radius of curvature are all millimeters (mm).

TABLE 9

Table 10 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

2.0685E-03

-2.7815E-04

-7.6946E-05

2.5366E-05

9.6363E-05

1.4075E-04

1.0098E-04

S2

-1.6453E-02

-4.0527E-03

-4.7560E-04

-2.4366E-04

-1.6153E-04

-6.7662E-05

-6.4917E-06

S3

-8.3287E-02

-7.9059E-03

-6.5736E-04

4.0973E-04

-4.4841E-04

-2.7456E-04

-1.6045E-04

S4

-8.5571E-02

6.5037E-05

4.0054E-04

1.0061E-03

7.8371E-05

-9.7520E-05

-4.2414E-05

S5

-7.5129E-02

3.8993E-03

-7.4949E-04

-3.4838E-04

-1.6610E-05

-2.7452E-04

-1.4376E-05

S6

-8.1909E-02

1.6127E-02

6.0997E-03

2.9065E-03

-4.5679E-04

4.9844E-04

8.1682E-05

S7

-3.0159E-01

5.8317E-02

-1.8691E-02

4.8868E-03

-5.4530E-03

1.4420E-03

-6.5818E-04

S8

-7.1955E-01

2.0296E-01

-6.8586E-02

4.0847E-03

6.9339E-06

7.4693E-03

-4.5034E-03

S9

-4.3169E-01

-6.5010E-02

1.7763E-02

1.6100E-02

-8.9911E-03

3.6967E-03

-2.2414E-03

S10

2.6247E+00

-7.8591E-01

3.1916E-01

-6.9994E-02

1.8852E-02

5.4548E-03

-7.1153E-03

S11

1.7999E+00

-4.5377E-01

1.6781E-01

-9.4644E-02

5.6675E-02

-4.1190E-02

3.6172E-02

S12

-6.1139E-02

-4.1046E-01

1.5548E-01

-1.2666E-01

7.1241E-02

-3.6749E-02

2.6612E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.6126E-05

3.0174E-05

1.2353E-05

0.0000E+00

S2

0.0000E+00

S3

3.6314E-06

3.7466E-05

4.3120E-05

1.3534E-05

5.7855E-06

0.0000E+00

S4

-3.2220E-05

-2.2323E-05

1.1605E-05

3.0924E-06

-1.2666E-06

1.5267E-06

0.0000E+00

S5

-1.0679E-04

-7.4365E-06

1.3838E-05

-8.2772E-06

0.0000E+00

S6

9.4586E-05

-2.7513E-05

-5.9137E-05

-1.7499E-05

-5.9708E-06

1.9495E-06

0.0000E+00

S7

2.3682E-04

-1.9631E-04

-4.7421E-06

-1.1878E-04

8.3509E-05

9.4867E-06

2.3984E-05

S8

1.6579E-03

-1.0243E-03

5.1599E-04

1.5789E-04

8.6358E-06

-4.7756E-04

-1.1050E-04

S9

1.5546E-03

-1.1355E-03

2.9087E-04

-1.5539E-04

1.9722E-04

-3.1109E-05

-9.0259E-06

S10

9.6380E-03

-7.3380E-03

-5.8458E-03

2.0234E-03

2.3950E-03

6.1171E-04

-2.0669E-04

S11

-8.4153E-03

5.6808E-03

-5.4092E-03

1.8529E-03

2.1391E-03

-2.4804E-04

-2.9906E-04

S12

-1.5565E-02

7.6787E-03

-2.4865E-03

1.4591E-03

-4.9003E-04

-2.8484E-04

6.6236E-05

TABLE 10

Fig. 22 shows an on-axis chromatic aberration curve of the imaging lens of example five, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 23 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example five. Fig. 24 shows distortion curves of the imaging lens of example five, which show distortion magnitude values corresponding to different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the imaging lens of example five, which represents deviation of different image heights on the imaging surface after light passes through the imaging lens.

As can be seen from fig. 22 to 25, the imaging lens according to example five can achieve good imaging quality.

Example six

As shown in fig. 26 to 30, an imaging lens of example six of the present application is described. Fig. 26 shows a schematic diagram of an imaging lens structure of example six.

As shown in fig. 26, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

The first lens E1 has positive power, and its object-side surface S1 is convex and its image-side surface S2 is concave. The second lens element E2 has positive power, and the object-facing surface S3 of the second lens element is concave, and the image-facing surface S4 of the second lens element is convex. The third lens E3 has positive power, and its object-side surface S5 is concave, and its image-side surface S6 is convex. The fourth lens E4 has negative power, and its object-side surface S7 is concave, and its image-side surface S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is a convex surface, and its image-side surface S10 is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is a concave surface and its image-side surface S12 is a convex surface. The filter E7 has a surface S13 facing the object side of the filter and a surface S14 facing the image side of the filter. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens is 2.54mm, the maximum half field angle Semi-FOV of the imaging lens is 48.5 °, the total length TTL of the imaging lens is 3.81mm, and the image height ImgH is 3.20 mm.

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

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each aspherical mirror surface in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example six above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.1980E-03

-7.6854E-04

1.2880E-04

1.7865E-05

1.4009E-04

9.1901E-05

8.9599E-05

S2

-1.7018E-02

-4.1359E-03

-5.7704E-04

-1.9565E-04

-1.7176E-04

-7.6374E-05

-2.6955E-05

S3

-8.2645E-02

-7.4083E-03

-6.3338E-04

2.9459E-04

-3.8849E-04

-3.1772E-04

-1.7256E-04

S4

-8.6692E-02

-4.4898E-04

2.6236E-04

9.2852E-04

-7.4801E-06

-1.7418E-04

-3.3209E-05

S5

-6.7971E-02

4.1701E-03

-1.0155E-03

-1.6476E-04

2.1292E-05

-3.3607E-04

-1.5103E-04

S6

-9.0665E-02

1.5055E-02

6.1245E-03

2.8299E-03

-4.4478E-04

4.7108E-04

1.2033E-05

S7

-2.9656E-01

6.0288E-02

-1.8811E-02

4.7524E-03

-5.5756E-03

1.5030E-03

-7.3271E-04

S8

-7.2192E-01

1.9992E-01

-6.5260E-02

4.2165E-03

-2.7040E-04

7.3250E-03

-4.2500E-03

S9

-4.2962E-01

-6.5118E-02

1.5613E-02

1.5516E-02

-9.0333E-03

4.1873E-03

-2.0375E-03

S10

2.5955E+00

-7.7769E-01

3.2356E-01

-7.2235E-02

1.7139E-02

6.5664E-03

-5.5065E-03

S11

1.8202E+00

-4.8623E-01

1.8233E-01

-9.2433E-02

5.9269E-02

-4.3925E-02

3.3375E-02

S12

-7.7094E-02

-3.9733E-01

1.5622E-01

-1.3048E-01

6.9292E-02

-3.4919E-02

2.6315E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

3.5203E-05

2.4546E-05

-1.2212E-06

0.0000E+00

S2

0.0000E+00

S3

-3.6193E-05

1.3387E-05

4.0544E-05

2.4077E-05

1.1129E-05

0.0000E+00

S4

-2.5076E-05

-1.8369E-05

3.0546E-05

1.7050E-05

1.3570E-05

6.9338E-06

0.0000E+00

S5

-1.0719E-04

6.2298E-05

-3.8900E-05

-5.4385E-05

0.0000E+00

S6

-6.1800E-05

-9.4182E-05

-1.2139E-04

-4.6773E-05

-4.0684E-05

4.7607E-06

0.0000E+00

S7

3.6215E-04

-1.4860E-04

2.4279E-05

-1.8264E-04

2.9424E-05

-2.4796E-05

4.9945E-05

S8

1.5092E-03

-1.0191E-03

5.2894E-04

1.6547E-04

-5.7488E-05

-4.4015E-04

-8.3022E-05

S9

1.8016E-03

-1.1192E-03

2.4071E-04

-1.8789E-04

1.4937E-04

-2.7196E-05

1.8456E-05

S10

7.8052E-03

-7.0459E-03

-5.5119E-03

2.1050E-03

2.2139E-03

5.0094E-04

-4.0343E-04

S11

-6.4515E-03

7.0420E-03

-5.6755E-03

1.8529E-03

2.1930E-03

8.3301E-04

1.8367E-04

S12

-1.5668E-02

7.9122E-03

-2.5047E-03

1.4816E-03

-5.0774E-04

-2.9805E-04

5.9420E-05

TABLE 12

Fig. 27 shows an on-axis chromatic aberration curve of the imaging lens of example six, which shows the deviation of the convergent focal points of light rays of different wavelengths after passing through the imaging lens. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example six. Fig. 29 shows distortion curves of the imaging lens of example six, which indicate distortion magnitude values corresponding to different angles of view. Fig. 30 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. 27 to 30, the imaging lens according to example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Conditional formula/example	1	2	3	4	5	6
							TTL/ImgH	1.20	1.19	1.19	1.19	1.19	1.19
F0V	92.0	92.5	94.8	97.0	96.5	97.0
							f/EPD	2.50	2.50	2.50	2.50	2.51	2.51
f1/f	1.14	1.24	1.42	1.55	1.47	1.44
							f4/f5	-2.46	-2.35	-2.59	-2.23	-2.80	-3.02
f/f6	-2.70	-2.43	-2.04	-1.41	-1.32	-1.31
							(R2+R1)/(R2-R1)	2.16	2.14	2.25	2.09	1.93	1.87
R3/f	-1.30	-1.31	-1.31	-1.81	-1.74	-1.80
							(R8+R9)/f	1.80	1.89	2.03	2.07	2.05	2.28
R11/R10	1.69	1.73	1.66	1.07	1.09	1.09
							CT5/T56	2.30	1.84	1.58	1.64	1.34	1.40
ET6/ET5	1.30	2.08	1.96	3.47	2.07	1.79
							SAG41/SAG42	0.70	1.39	0.70	0.48	0.52	0.69
SAG61/SAG62	0.86	1.60	1.51	1.67	1.09	0.94
							f12/f	1.84	1.66	2.89	2.82	2.74	1.45
f56/f	1.17	1.11	1.02	0.93	0.88	0.95

Watch 13

Table 14 gives effective focal lengths f of the imaging lenses of example one to example six, and effective focal lengths f1 to f6 of the respective lenses.

Parameter/example	1	2	3	4	5	6
							f(mm)	3.15	2.94	2.95	2.54	2.55	2.54
f1(mm)	3.60	3.64	4.20	3.94	3.75	3.65
							f2(mm)	-7.61	-12.21	-7.10	-7.48	-6.77	294.57
f3(mm)	4.61	5.15	4.73	4.14	6.53	1120.75
							f4(mm)	-2.91	-2.78	-3.39	-2.85	-3.67	-4.04
f5(mm)	1.18	1.18	1.31	1.28	1.31	1.34
							f6(mm)	-1.17	-1.21	-1.44	-1.80	-1.93	-1.94
TTL(mm)	4.05	3.89	4.02	3.89	3.81	3.81
							ImgH(mm)	3.36	3.26	3.38	3.26	3.20	3.20
Semi-FOV(°)	46.0	46.2	47.4	48.5	48.3	48.5

TABLE 14

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 forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

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, in order from an object side to an image side:

a first lens having an optical power;

a second lens with a focal power, wherein the surface facing the object side is a concave surface, and the surface facing the image side is a convex surface;

a third lens having an optical power;

a fourth lens having a power, a surface facing the object side of the fourth lens being a concave surface, and a surface facing the image side of the fourth lens being a concave surface;

a fifth lens with positive refractive power, the surface facing the object side of the fifth lens is a convex surface, and the surface facing the image side of the fifth lens is a convex surface;

a sixth lens having a refractive power, a surface of which facing the object side is a concave surface;

wherein, an on-axis distance TTL from a surface of the first lens facing the object side to an imaging surface and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.2; the central thickness CT5 of the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy that: 1.0< CT5/T56< 2.5.

2. The imaging lens of claim 1, wherein an effective focal length f of the imaging lens and an entrance pupil diameter EPD of the imaging lens satisfy: f/EPD is less than or equal to 2.6.

3. The imaging lens according to claim 1, wherein a maximum field angle FOV of the imaging lens satisfies: 90 < FOV < 100.

4. An imaging lens according to claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f of the imaging lens satisfy: f1/f is more than 1.0 and less than 2.0.

5. The imaging lens according to claim 1, wherein an effective focal length f4 of the fourth lens element and an effective focal length f5 of the fifth lens element satisfy: -3.5 < f4/f5 < -2.0.

6. An imaging lens according to claim 1, wherein an effective focal length f6 of the sixth lens element and an effective focal length f of the imaging lens satisfy: -3.0 < f/f 6< -1.0.

7. The imaging lens according to claim 1, wherein a radius of curvature R1 of a surface of the first lens facing the object side and a radius of curvature R2 of a surface of the first lens facing the image side satisfy: 1.5 < (R2+ R1)/(R2-R1) < 2.5.

8. An imaging lens according to claim 1, wherein a radius of curvature R3 of a surface of the second lens facing the object side and an effective focal length f of the imaging lens satisfy: -2.0 < R3/f < -1.0.

9. The imaging lens according to claim 1, wherein a curvature radius R8 of a surface of the fourth lens facing the image side, a curvature radius R9 of a surface of the fifth lens facing the object side, and an effective focal length f of the imaging lens satisfy: 1.5 < (R8+ R9)/f < 2.5.

10. An imaging lens, comprising, in order from an object side to an image side:

a first lens having an optical power;

a third lens having an optical power;

wherein the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens satisfy: 1.0< ET6/ET5 < 3.5; a center thickness CT5 of the fifth lens on an optical axis and an air space T56 of the fifth lens and the sixth lens on the optical axis satisfy: 1.0< CT5/T56< 2.5.