CN216792567U

CN216792567U - Camera lens

Info

Publication number: CN216792567U
Application number: CN202220303906.0U
Authority: CN
Inventors: 杨泉锋; 贺凌波; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2022-06-21
Anticipated expiration: 2032-02-15

Abstract

The utility model provides a camera lens. The imaging lens includes, from an object side to an image side of the imaging lens: the first lens has negative focal power, the surface of the first lens facing the object side is a concave surface, and the surface of the first lens facing the image side is a concave surface; a second lens having an optical power, the abbe number of the second lens being less than 20; the third lens has focal power, and the surface of the third lens facing the object side is a convex surface; the fourth lens has negative focal power, and the surface of the fourth lens facing the object side is a concave surface; a fifth lens having an optical power; a sixth lens having an optical power; wherein, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the following condition: 2.0 < f2/f5 < 4.0. The utility model solves the problem that the high image quality and miniaturization of the image pickup lens in the prior art cannot be considered at the same time.

Description

Camera lens

Technical Field

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

Background

With the development of society, electronic products such as mobile phones and tablets have become indispensable tools in people's lives, and in order to be adaptable to these electronic products, the imaging quality is ensured, and the camera lens is gradually developed in the direction of miniaturization and lightness, so that the design is difficult. In addition, the performance of the image sensor is improved and the size of the image sensor is reduced, and the image pickup lens is required to be miniaturized.

That is, the imaging lens in the prior art has the problem that the high image quality and the miniaturization can not be compatible.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an image pickup lens, which solves the problem that the image pickup lens in the prior art cannot give consideration to high image quality and miniaturization.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens comprising, from an object side of the imaging lens to an image side of the imaging lens: the first lens has negative focal power, the surface of the first lens facing the object side is a concave surface, and the surface of the first lens facing the image side is a concave surface; a second lens having an optical power, the abbe number of the second lens being less than 20; the third lens has focal power, and the surface of the third lens facing the object side is a convex surface; the fourth lens has negative focal power, and the surface of the fourth lens facing the object side is a concave surface; a fifth lens having an optical power; a sixth lens having an optical power; wherein, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the following condition: 2.0 < f2/f5 < 4.0.

Further, the effective focal length f of the imaging lens and the effective focal length f3 of the third lens satisfy: f3/f is more than 1.5 and less than 5.0.

Further, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.0.

Further, the radius of curvature R3 of the surface of the second lens facing the object side and the radius of curvature R11 of the surface of the sixth lens facing the object side satisfy: -1.5 < R3/R11 < 0.5.

Further, a curvature radius R3 of the surface of the second lens facing the object side and a curvature radius R12 of the surface of the sixth lens facing the image side satisfy: -0.5 < R3/R12 < 1.5.

Further, a curvature radius R6 of the surface of the third lens facing the image side and a curvature radius R10 of the surface of the fifth lens facing the image side satisfy: 1.5 < R6/R10 < 7.5.

Further, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT2/CT1 < 2.0.

Further, the central thickness CT3 of the third lens on the optical axis, and the air space T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5.

Further, the radius of curvature R4 of the surface of the second lens facing the image side and the radius of curvature R5 of the surface of the third lens facing the object side satisfy: R4/R5 is more than or equal to 1.0 and less than or equal to 3.0.

Further, the air space T12 of the first lens and the second lens on the optical axis and the air space T23 of the second lens and the third lens on the optical axis satisfy: 1.0 < T12/T23 < 2.5.

Further, the central thickness CT5 of the fifth lens on the optical axis, and the air space T45 of the fourth lens and the fifth lens on the optical axis satisfy: 6.3 < CT5/T45 < 11.5.

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 a central thickness CT6 of the sixth lens on the optical axis satisfy: -2.0 < SAG61/CT6 < -0.5.

Furthermore, the Abbe number V2 of the second lens, the Abbe number V4 of the fourth lens and the Abbe number V6 of the sixth lens satisfy the following conditions: v2+ V4+ V6 < 60.

Further, the abbe number V1 of the first lens and the abbe number V3 of the third lens satisfy: v1+ V3 < 50.

According to another aspect of the present invention, there is provided an imaging lens including, from an object side of the imaging lens to an image side of the imaging lens: the first lens has negative focal power, the surface of the first lens facing the object side is a concave surface, and the surface of the first lens facing the image side is a concave surface; a second lens having an optical power, the abbe number of the second lens being less than 20; the third lens has focal power, and the surface of the third lens facing the object side is a convex surface; the fourth lens has negative focal power, and the surface of the fourth lens, which faces the object side, is a concave surface; a fifth lens having an optical power; a sixth lens having an optical power; and the effective focal length f of the camera lens and the effective focal length f3 of the third lens satisfy the following conditions: f3/f is more than 1.5 and less than 5.0.

Further, the curvature radius R3 of the surface of the second lens facing the object side and the curvature radius R12 of the surface of the sixth lens facing the image side satisfy that: -0.5 < R3/R12 < 1.5.

Further, the radius of curvature R6 of the surface of the third lens facing the image side and the radius of curvature R10 of the surface of the fifth lens facing the image side satisfy: 1.5 < R6/R10 < 7.5.

Further, the central thickness CT5 of the fifth lens on the optical axis, and the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 6.3 < CT5/T45 < 11.5.

By applying the technical scheme of the utility model, the image side of the camera lens from the object side of the camera lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens has negative focal power, the surface of the first lens facing the object side is a concave surface, and the surface of the first lens facing the image side is a concave surface; the second lens has focal power, and the Abbe number of the second lens is less than 20; the third lens has focal power, and the surface of the third lens facing the object side is a convex surface; the fourth lens has negative focal power, and the surface of the fourth lens facing the object side is a concave surface; the fifth lens has focal power; the sixth lens has focal power; wherein, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the following condition: 2.0 < f2/f5 < 4.0.

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. By limiting f2/f5 within a reasonable range, the imaging lens is beneficial to better balancing aberration, and the resolving power of the imaging lens is improved, so that the imaging quality of the imaging lens is ensured.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. 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 4 respectively show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 1;

fig. 5 is a schematic view showing a configuration of an imaging lens according to a second example of the present invention;

fig. 6 to 8 show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 5, respectively;

fig. 9 is a schematic view showing a configuration of an imaging lens according to a third example of the present invention;

fig. 10 to 12 show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 9, respectively;

fig. 13 is a schematic view showing a configuration of an imaging lens of example four of the present invention;

fig. 14 to 16 show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens in fig. 13;

fig. 17 is a schematic view showing a configuration of an imaging lens of example five of the present invention;

fig. 18 to 20 show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 17, respectively;

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

fig. 22 to 24 show an axial chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 21, respectively.

Wherein the figures include the following reference numerals:

STO, stop; e1, a first lens; s1, the surface of the first lens facing the object side; s2, the surface of the first lens facing the image side; e2, a second lens; s3, the surface of the second lens facing the object side; s4, the surface of the second lens facing the image side; e3, third lens; s5, the surface of the third lens facing the object side; s6, the surface of the third lens facing the image side; e4, fourth lens; s7, the surface of the fourth lens facing the object side; s8, the surface of the fourth lens facing the image side; e5, fifth lens; s9, the surface of the fifth lens facing the object side; s10, the surface of the fifth lens facing the image side; e6, sixth lens; s11, the surface of the sixth lens facing the object side; s12, the surface of the sixth lens facing the image side; e7 filter plate; s13, the surface of the filter facing the object side; s14, the surface of the filter plate 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 accompanying drawings in conjunction with embodiments.

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 utility model.

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 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 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 value of R is positive, and a concave surface is determined when the value of R is negative; the surface facing 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 utility model provides a camera lens, aiming at solving the problem that the camera lens in the prior art cannot give consideration to high image quality and miniaturization.

Example one

As shown in fig. 1 to 24, the image side of the image capturing lens from the object side of the image capturing lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the first lens has a negative power, a surface of the first lens facing the object side is a concave surface, and a surface of the first lens facing the image side is a concave surface; the second lens has focal power, and the Abbe number of the second lens is less than 20; the third lens has focal power, and the surface of the third lens facing the object side is a convex surface; the fourth lens has negative focal power, and the surface of the fourth lens facing the object side is a concave surface; the fifth lens has focal power; the sixth lens has focal power; wherein, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the following condition: 2.0 < f2/f5 < 4.0.

Preferably, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 2.1 < f2/f5 < 3.9.

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f3 of the third lens satisfy: f3/f is more than 1.5 and less than 5.0. The focal length of the third lens is reasonably controlled, ghost images formed by the third lens can be controlled, and meanwhile, the sensitivity of the third lens can be reduced, so that the imaging quality of the camera lens is guaranteed. Preferably, 1.75 < f3/f < 5.0.

In the present embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.0. By controlling f6/f5 within a reasonable range, the camera lens is beneficial to better balancing aberration, meanwhile, the resolving power of the camera lens is improved, and the imaging quality of the camera lens is ensured. Preferably, -2.0 < f6/f5 < -1.2.

In the present embodiment, the radius of curvature R3 of the surface of the second lens facing the object side and the radius of curvature R11 of the surface of the sixth lens facing the object side satisfy: -1.5 < R3/R11 < 0.5. The ratio of the radius of curvature of the surface of the second lens facing the object side to the radius of curvature of the surface of the sixth lens facing the object side is limited within a certain range, which contributes to the improvement of the stability of the assembly of the lenses. Preferably, -1.4 < R3/R11 < 0.2.

In the present embodiment, a radius of curvature R3 of the object-side-facing surface of the second lens and a radius of curvature R12 of the image-side-facing surface of the sixth lens satisfy: -0.5 < R3/R12 < 1.5. The ratio of the radius of curvature of the surface of the second lens facing the object side to the radius of curvature of the surface of the sixth lens facing the image side is limited in a certain range, which is beneficial to improving the stability of lens assembly. Preferably, -0.2 < R3/R12 < 1.3.

In the present embodiment, a radius of curvature R6 of the surface of the third lens facing the image side and a radius of curvature R10 of the surface of the fifth lens facing the image side satisfy: 1.5 < R6/R10 < 7.5. The ratio of the radius of curvature of the surface of the third lens facing the image side to the radius of curvature of the surface of the fifth lens facing the image side is limited within a certain range, which is beneficial to improving the stability of lens assembly. Preferably, 1.6 < R6/R10 < 7.4.

In the present embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT2/CT1 < 2.0. The center thicknesses of the first lens and the second lens are reasonably distributed, so that the lenses are easy to perform injection molding, the machinability of the camera lens is improved, and meanwhile, the better imaging quality is ensured. Preferably, 1.0 < CT2/CT1 < 1.8.

In the present embodiment, the central thickness CT3 of the third lens on the optical axis, and the air space T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5. The camera lens can have smaller field curvature by controlling the central thickness of the third lens and the air interval between the third lens and the fourth lens on the optical axis, so that the imaging quality of the camera lens is ensured. Preferably, 1.6 < CT3/T34 < 5.4.

In the present embodiment, a radius of curvature R4 of the image-side facing surface of the second lens and a radius of curvature R5 of the object-side facing surface of the third lens satisfy: R4/R5 is more than or equal to 1.0 and less than or equal to 3.0. The ratio of the curvature radius of the surface of the second lens facing the image side to the curvature radius of the surface of the third lens facing the object side is reasonably controlled within a reasonable range, so that the sensitivity of the camera lens is favorably reduced, and the imaging quality of the camera lens is ensured. Preferably, 1.0. ltoreq.R 4/R5 < 2.9.

In the present embodiment, the air space T12 of the first lens and the second lens on the optical axis and the air space T23 of the second lens and the third lens on the optical axis satisfy: 1.0 < T12/T23 < 2.5. The air interval of camera lens is rationally distributed, processing and assembling characteristics can be guaranteed, and the problem of lens interference around the assembling process caused by the undersize interval is avoided. Meanwhile, the light deflection is favorably slowed down, the field curvature of the camera lens is adjusted, the sensitivity is reduced, and the better imaging quality is obtained. Preferably, 1.1 < T12/T23 < 2.3.

In the present embodiment, the central thickness CT5 of the fifth lens on the optical axis, and the air space T45 of the fourth lens and the fifth lens on the optical axis satisfy: 6.3 < CT5/T45 < 11.5. The central thickness of the fifth lens and the air interval of the fourth lens and the fifth lens on the optical axis are controlled within a reasonable range, so that the chromatic aberration of the camera lens can be better balanced, and the distortion of the camera lens is effectively controlled. Preferably 6.4 < CT5/T45 < 11.3.

In the embodiment, the on-axis distance SAG61 between the intersection point of the surface of the sixth lens facing the object side and the optical axis and the effective radius vertex of the surface of the sixth lens facing the object side and the central thickness CT6 of the sixth lens on the optical axis satisfy: -2.0 < SAG61/CT6 < -0.5. The ratio of SAG61 and CT6 is controlled within a reasonable range, so that the sixth lens can be effectively prevented from being too bent, the processing difficulty is reduced, and the assembly of the camera lens has higher stability. Preferably, -1.9 < SAG61/CT6 < -0.5.

In this embodiment, the abbe number V2 of the second lens, the abbe number V4 of the fourth lens, and the abbe number V6 of the sixth lens satisfy: v2+ V4+ V6 < 60. Through reducing the abbe numbers of the second lens, the fourth lens and the sixth lens, the chromatic aberration can be controlled within a reasonable range, so that the imaging quality of the camera lens is ensured. Preferably 50 < V2+ V4+ V6 < 60.

In the embodiment, the abbe number V1 of the first lens and the abbe number V3 of the third lens satisfy: v1+ V3 < 50. The abbe numbers of the first lens and the second lens are controlled within a reasonable range, so that the chromatic aberration can be controlled within a reasonable range, and the imaging quality of the camera lens is ensured. Preferably, 40 < V1+ V3 < 50.

Example two

As shown in fig. 1 to 24, the image side of the image capturing lens from the object side of the image capturing lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the first lens has a negative power, a surface of the first lens facing the object side is a concave surface, and a surface of the first lens facing the image side is a concave surface; the second lens has focal power, and the Abbe number of the second lens is less than 20; the third lens has focal power, and the surface of the third lens facing the object side is a convex surface; the fourth lens has negative focal power, and the surface of the fourth lens facing the object side is a concave surface; the fifth lens has focal power; the sixth lens has focal power; and the effective focal length f of the camera lens and the effective focal length f3 of the third lens satisfy the following conditions: f3/f is more than 1.5 and less than 5.0.

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. The focal length of the third lens is reasonably controlled, ghost images formed by the third lens can be controlled, and meanwhile, the sensitivity of the third lens can be reduced, so that the imaging quality of the camera lens is guaranteed.

Preferably, the effective focal length f of the image pickup lens and the effective focal length f3 of the third lens satisfy: f3/f is more than 1.75 and less than 5.0.

In the present embodiment, a radius of curvature R3 of the object-side-facing surface of the second lens and a radius of curvature R12 of the image-side-facing surface of the sixth lens satisfy: -0.5 < R3/R12 < 1.5. The ratio of the radius of curvature of the surface of the second lens facing the object side to the radius of curvature of the surface of the sixth lens facing the image side is limited within a certain range, which contributes to the improvement of the stability of the assembly of the lenses. Preferably, -0.2 < R3/R12 < 1.3.

In the present embodiment, a radius of curvature R6 of the surface of the third lens facing the image side and a radius of curvature R10 of the surface of the fifth lens facing the image side satisfy: 1.5 < R6/R10 < 7.5. The ratio of the radius of curvature of the surface of the third lens facing the image side to the radius of curvature of the surface of the fifth lens facing the image side is limited within a certain range, which contributes to the improvement of the stability of the assembly of the lenses. Preferably, 1.6 < R6/R10 < 7.4.

In the present embodiment, the central thickness CT3 of the third lens on the optical axis, and the air space T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5. Through the control of the center thickness of the third lens and the air interval between the third lens and the fourth lens on the optical axis, the camera lens can have smaller field curvature, so that the imaging quality of the camera lens is ensured. Preferably, 1.6 < CT3/T34 < 5.4.

In the present embodiment, the abbe number V1 of the first lens and the abbe number V3 of the third lens satisfy: v1+ V3 < 50. The abbe numbers of the first lens and the second lens are controlled within a reasonable range, so that the chromatic aberration can be controlled within a reasonable range, and the imaging quality of the camera lens is ensured. Preferably, 40 < V1+ V3 < 50.

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.

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.

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 include 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 4, 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 first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an image forming surface S15.

The first lens E1 has negative power, and its surface facing the object side S1 is concave, and its surface facing the image side S2 is concave. The second lens E2 has positive power, and its object-side surface S3 is convex and its image-side surface S4 is concave. The third lens E3 has positive power, and its surface facing the object side S5 is a convex surface, and its surface facing the image side S6 is a convex surface. The fourth lens E4 has negative power, and the surface S7 facing the object side of the fourth lens is a concave surface, and the surface S8 facing the image side of the fourth lens is a concave surface. The fifth lens E5 has positive power, and its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens E6 has negative power, and its object-side surface S11 is convex and its image-side surface S12 is concave. The filter E7 has a surface S13 facing the object side and a surface S14 facing the image side. 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 camera lens is 1.30mm, the total length TTL of the camera lens is 6.50mm and the image height ImgH is 2.29 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 focal length 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 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 values A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for 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 distortion curves of the imaging lens of the first example, which show distortion magnitude values corresponding to different angles of view. Fig. 4 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 4, the imaging lens according to the first example can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, 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. 5 shows a schematic diagram of the imaging lens structure of example two.

As shown in fig. 5, the imaging lens includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a stop STO, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image plane S15.

The first lens E1 has negative power, and the surface S1 facing the object side of the first lens is a concave surface, and the surface S2 facing the image side of the first lens is a concave surface. The second lens E2 has positive power, and its object-side surface S3 is convex and its image-side surface S4 is concave. The third lens E3 has positive power, and its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has negative power, and its surface facing the object side S7 is concave, and its surface facing the image side S8 is concave. The fifth lens E5 has positive power, and the surface S9 facing the object side of the fifth lens is a convex surface, and the surface S10 facing the image side of the fifth lens is a convex surface. The sixth lens E6 has negative power, and its surface facing the object side S11 is concave, and its surface facing the image side S12 is concave. The filter E7 has a surface S13 facing the object side and a surface S14 facing the image side. 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 camera lens is 1.30mm, the total length TTL of the camera lens is 6.50mm and the image height ImgH is 2.60 mm.

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

TABLE 3

Table 4 shows the high-order term coefficients that can be used for each aspherical mirror in example two, wherein each aspherical mirror type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.5191E+00

-5.6576E-01

1.8839E-01

-6.7099E-02

2.7945E-02

-1.2614E-02

5.7974E-03

S2

7.8433E-01

-2.0604E-01

3.6105E-02

-3.7334E-03

6.4468E-04

1.6500E-04

-4.8126E-04

S3

3.9756E-02

-2.0387E-02

3.8933E-03

3.3550E-04

1.0834E-04

-1.0057E-04

-6.4603E-05

S4

1.2230E-02

2.0926E-03

1.0288E-03

3.8371E-04

4.2557E-04

1.0519E-04

-9.0640E-07

S5

-3.3603E-02

-3.2846E-03

1.3878E-03

1.2012E-04

-6.3893E-04

-2.0264E-04

2.3549E-04

S6

-2.0299E-01

-3.7753E-02

-5.4782E-03

-4.8271E-03

-2.9648E-03

-1.0998E-03

-4.0313E-04

S7

-1.4667E-01

-2.4642E-02

1.0449E-02

-2.3146E-03

-1.5715E-03

1.9998E-03

4.6723E-04

S8

-7.7283E-03

-7.2281E-02

1.0730E-03

2.8736E-03

-5.5940E-04

5.6202E-04

-1.2018E-03

S9

-1.6470E-01

4.9765E-02

-3.0510E-02

1.3582E-02

-2.0193E-03

5.1022E-03

3.1502E-04

S10

1.4550E-01

3.4308E-03

2.3605E-02

-5.2405E-02

1.4651E-02

7.8084E-03

1.6252E-02

S11

-1.7713E+00

-1.8439E-01

1.3601E-01

3.0525E-02

-3.2158E-02

4.6086E-03

3.6787E-02

S12

-2.3210E+00

1.2736E-01

-2.4565E-01

4.2243E-02

3.9776E-02

2.1503E-02

-2.3409E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.6533E-03

1.1091E-03

-4.7509E-04

2.5099E-04

-1.2853E-04

4.9657E-05

-8.9910E-06

S2

5.2472E-04

-3.5395E-04

1.0759E-04

-9.4593E-06

-7.0621E-07

-1.2484E-07

6.5533E-08

S3

-1.7920E-05

-1.1158E-05

3.6811E-05

-3.1369E-06

-7.8544E-06

3.0626E-06

-3.7221E-07

S4

-2.0011E-04

-2.0326E-04

-1.9676E-04

-1.1999E-04

-9.1462E-05

-3.5848E-05

-1.8034E-05

S5

2.2292E-04

-9.4382E-06

-1.1432E-04

-6.5333E-05

1.4032E-05

3.0605E-05

1.3681E-05

S6

-1.4098E-04

-1.9029E-05

-1.3258E-05

-4.0133E-05

-7.1831E-05

-4.4694E-05

-2.0496E-05

S7

-6.2966E-04

-4.6549E-04

7.4167E-05

1.7382E-04

4.3259E-05

-6.8581E-06

6.3213E-06

S8

1.7862E-03

-8.4822E-04

-3.7381E-05

2.4824E-04

7.7108E-05

-2.8845E-04

-1.9991E-04

S9

7.5778E-04

-5.7764E-04

6.8003E-05

2.4390E-04

3.0115E-04

1.8737E-04

4.7896E-05

S10

-4.8116E-03

-2.1698E-03

-1.2717E-03

3.4692E-03

-3.4711E-03

-5.0012E-03

-2.7729E-03

S11

6.4074E-04

-7.4935E-03

-8.3890E-04

7.3587E-03

-4.1993E-03

-6.2001E-03

-2.9104E-03

S12

-1.1974E-02

1.1639E-02

1.2357E-02

2.2136E-03

-6.2433E-03

-4.0039E-03

-3.2155E-03

TABLE 4

Fig. 6 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. 7 shows distortion curves of the imaging lens of example two, which show values of distortion magnitudes corresponding to different angles of view. Fig. 8 shows a chromatic aberration of magnification curve of the imaging lens of the second example, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging lens.

As can be seen from fig. 6 to 8, the imaging lens according to example two can achieve good imaging quality.

Example III

As shown in fig. 9 to 12, an imaging lens of example three of the present application is described. Fig. 9 shows a schematic diagram of an imaging lens structure of example three.

As shown in fig. 9, the imaging lens includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a stop STO, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image plane S15.

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

Table 5 shows a basic configuration parameter table of the imaging lens of example three, in which the units of the radius of curvature, thickness/distance, and focal length are 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.5247E+00

-5.6658E-01

1.8871E-01

-6.6979E-02

2.8151E-02

-1.2562E-02

5.8431E-03

S2

7.7884E-01

-2.0594E-01

3.5679E-02

-3.6572E-03

6.1862E-04

1.4442E-04

-4.8064E-04

S3

3.3893E-02

-2.0789E-02

4.0079E-03

5.6853E-04

1.2248E-04

-5.0157E-05

-2.5821E-05

S4

1.6108E-02

3.2454E-03

1.5828E-03

1.2936E-04

1.4777E-04

2.5562E-05

5.9117E-05

S5

1.4569E-03

1.0989E-03

-2.2138E-03

1.0394E-03

-2.7670E-04

-4.6353E-04

3.7763E-04

S6

-4.3384E-02

-1.3829E-03

1.3461E-03

-1.6522E-03

2.2201E-05

6.1770E-04

1.6521E-04

S7

-1.2667E-01

-1.0391E-02

4.8831E-03

1.0554E-03

-1.2599E-03

2.1276E-04

5.8987E-04

S8

-1.0181E-01

-2.2669E-02

-2.7144E-03

3.5338E-03

-8.3725E-04

3.7984E-04

-8.8400E-04

S9

-1.8532E-01

2.6076E-02

-2.1287E-02

6.1631E-03

1.2696E-03

3.0483E-03

-1.8398E-04

S10

1.6731E-01

2.3038E-01

-2.8846E-02

-3.4641E-02

2.6729E-02

1.1359E-02

5.3740E-03

S11

-1.3892E+00

4.8909E-04

1.8741E-02

7.3875E-02

-1.5614E-02

-9.4411E-03

2.9506E-02

S12

-2.5204E+00

2.0355E-01

-2.8580E-01

7.9250E-02

4.8657E-02

1.0396E-02

-3.4877E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.6372E-03

1.1313E-03

-5.1909E-04

2.6814E-04

-1.3643E-04

5.3819E-05

-9.8482E-06

S2

5.3400E-04

-3.4075E-04

1.1021E-04

-1.1786E-05

-1.5514E-06

-3.1238E-07

2.6975E-07

S3

1.6496E-06

-1.2544E-05

3.3200E-05

-1.9176E-05

1.9943E-06

1.6561E-06

-4.2223E-07

S4

1.0442E-05

1.3067E-05

-2.7535E-06

3.5749E-06

-6.6254E-06

5.6809E-07

-3.3779E-06

S5

1.6287E-04

-3.0489E-04

-3.5863E-05

2.0093E-04

5.3106E-05

-6.6905E-05

-3.2246E-05

S6

-2.7145E-04

-1.8358E-04

1.3778E-05

7.8956E-05

2.7843E-05

-5.8128E-06

-8.2692E-06

S7

4.1644E-05

-3.3553E-04

-2.4524E-04

-1.0574E-05

1.0115E-04

7.3383E-05

2.7372E-05

S8

2.4958E-05

5.2686E-04

2.2911E-05

-2.7959E-04

-3.1895E-04

-1.3097E-04

-2.6503E-05

S9

2.2779E-04

3.1671E-04

3.9954E-04

4.2083E-04

1.2921E-04

5.3308E-05

-1.4969E-05

S10

8.5718E-04

2.6184E-03

-2.3132E-03

6.2030E-04

-1.9499E-03

-2.2153E-03

-1.2324E-03

S11

1.1007E-02

-2.9638E-03

-7.1583E-03

3.8203E-03

2.6332E-03

2.3429E-03

9.2322E-04

S12

2.3413E-03

1.5745E-02

-1.3370E-03

8.4367E-03

1.8625E-03

-9.0176E-03

-1.0070E-02

TABLE 6

Fig. 10 shows an on-axis 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. 11 shows distortion curves of the imaging lens of example three, which show distortion magnitude values corresponding to different angles of view. Fig. 12 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. 10 to 12, the imaging lens according to the third example can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, an imaging lens of the present example four is described. Fig. 13 shows a schematic diagram of an imaging lens structure of example four.

As shown in fig. 13, the imaging lens includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a stop STO, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image plane S15.

The first lens E1 has negative power, and its surface facing the object side S1 is concave, and its surface facing the image side S2 is concave. The second lens E2 has positive power, and its object-side surface S3 is convex and its image-side surface S4 is concave. The third lens E3 has positive power, and its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has negative power, and its surface facing the object side S7 is concave, and its surface facing the image side S8 is convex. The fifth lens E5 has positive power, and its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens E6 has negative power, and its surface facing the object side S11 is concave, and its surface facing the image side S12 is concave. Filter E7 has an object side facing surface S13 of the filter and an image side facing surface S14 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.

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 focal length 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. 14 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. 15 shows distortion curves of the imaging lens of example four, which show distortion magnitude values corresponding to different angles of view. Fig. 16 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. 14 to 16, the imaging lens according to example four can achieve good imaging quality.

Example five

As shown in fig. 17 to 20, an imaging lens of example five of the present application is described. Fig. 17 shows a schematic diagram of an imaging lens structure of example five.

As shown in fig. 17, the imaging lens includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a stop STO, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image plane S15.

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

Table 9 shows a basic structural parameter table 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 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.

Watch 10

Fig. 18 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. 19 shows distortion curves of the imaging lens of example five, which show distortion magnitude values corresponding to different angles of view. Fig. 20 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. 18 to 20, the imaging lens according to example five can achieve good imaging quality.

Example six

As shown in fig. 21 to 24, an imaging lens of example six of the present application is described. Fig. 21 shows a schematic diagram of an imaging lens structure of example six.

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

The first lens E1 has negative power, and its surface facing the object side S1 is concave, and its surface facing the image side S2 is concave. The second lens E2 has positive power, and its object-side surface S3 is convex and its image-side surface S4 is concave. The third lens E3 has positive power, and its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has negative power, and its surface facing the object side S7 is concave, and its surface facing the image side S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens E6 has negative power, and the surface S11 facing the object side of the sixth lens is a concave surface, and the surface S12 facing the image side of the sixth lens is a convex surface. Filter E7 has an object side facing surface S13 of the filter and an image side facing surface S14 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.

Table 11 shows a basic structural parameter table 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).

TABLE 11

Table 12 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.

TABLE 12

Fig. 22 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. 23 shows distortion curves of the imaging lens of example six, which show distortion magnitude values corresponding to different angles of view. Fig. 24 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. 22 to 24, 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.

Conditions/examples	1	2	3	4	5	6
							f3/f	1.89	1.81	4.99	2.34	2.25	1.96
f2/f5	2.13	3.64	3.13	3.06	3.71	3.13
							f6/f5	-1.83	-1.47	-1.99	-1.80	-1.43	-1.96
R3/R11	0.02	-0.98	-0.07	-0.51	-1.39	-1.34
							R3/R12	1.05	0.92	1.04	0.79	0.63	-0.08
R6/R10	1.79	3.36	3.86	5.11	7.19	3.57
							CT2/CT1	1.07	1.54	1.39	1.40	1.54	1.20
R4/R5	1.06	1.42	2.77	1.93	2.26	1.84
							T12/T23	2.04	1.20	1.47	1.22	1.49	1.27
CT3/T34	5.00	4.11	1.75	2.46	2.72	5.24
							CT5/T45	6.43	11.10	10.59	10.59	9.78	7.88
SAG61/CT6	-1.74	-0.72	-0.71	-0.74	-0.51	-0.87
							V2+V4+V6	57.60	57.60	57.60	57.60	57.60	57.60
V1+V3	47.00	47.00	47.00	47.00	47.00	47.00

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.

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 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 accompanying drawings 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, from an object side of the imaging lens to an image side of the imaging lens:

the first lens has negative focal power, the surface of the first lens facing to the object side is a concave surface, and the surface of the first lens facing to the image side is a concave surface;

a second optic having an optical power, said second optic having an Abbe number less than 20;

the third lens has focal power, and the surface of the third lens, which faces the object side, is a convex surface;

the fourth lens has negative focal power, and the surface of the fourth lens, facing the object side, is a concave surface;

a fifth lens having an optical power;

a sixth lens having an optical power;

wherein the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 2.0 < f2/f5 < 4.0.

2. An imaging lens according to claim 1, wherein an effective focal length f3 of the third lens satisfies: f3/f is more than 1.5 and less than 5.0.

3. The imaging lens according to claim 1, wherein an effective focal length f5 of the fifth lens and an effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.0.

4. The imaging lens according to claim 1, wherein a radius of curvature R3 of a surface of the second lens facing the object side and a radius of curvature R11 of a surface of the sixth lens facing the object side satisfy: -1.5 < R3/R11 < 0.5.

5. The imaging lens of claim 1, wherein a radius of curvature R3 of a surface of the second lens facing the object side and a radius of curvature R12 of a surface of the sixth lens facing the image side satisfy: -0.5 < R3/R12 < 1.5.

6. The imaging lens of claim 1, wherein a radius of curvature R6 of the image-side facing surface of the third lens and a radius of curvature R10 of the image-side facing surface of the fifth lens satisfy: 1.5 < R6/R10 < 7.5.

7. The imaging lens according to claim 1, wherein a center thickness CT1 of the first lens piece on an optical axis and a center thickness CT2 of the second lens piece on the optical axis satisfy: 1.0 < CT2/CT1 < 2.0.

8. The imaging lens according to claim 1, wherein a center thickness CT3 of the third lens on an optical axis, and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5.

9. The imaging lens of claim 1, wherein a radius of curvature R4 of a surface of the second lens facing the image side and a radius of curvature R5 of a surface of the third lens facing the object side satisfy: R4/R5 is more than or equal to 1.0 and less than or equal to 3.0.

10. The imaging lens according to claim 1, wherein an air interval T12 on an optical axis of the first lens and the second lens, and an air interval T23 on the optical axis of the second lens and the third lens satisfy: 1.0 < T12/T23 < 2.5.

11. The imaging lens according to claim 1, wherein a center thickness CT5 of the fifth lens on an optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 6.3 < CT5/T45 < 11.5.

12. The imaging lens according to claim 1, wherein an on-axis distance SAG61 between an intersection point of an optical axis and a surface of the sixth lens facing the object side and an effective radius vertex of the surface of the sixth lens facing the object side, and a center thickness CT6 of the sixth lens on the optical axis satisfy: -2.0 < SAG61/CT6 < -0.5.

13. The imaging lens according to claim 1, wherein abbe number V2 of the second lens, abbe number V4 of the fourth lens, abbe number V6 of the sixth lens satisfy: v2+ V4+ V6 < 60.

14. The imaging lens according to claim 1, wherein an abbe number V1 of the first lens and an abbe number V3 of the third lens satisfy: v1+ V3 < 50.

15. An imaging lens, comprising, from an object side of the imaging lens to an image side of the imaging lens:

the first lens has negative focal power, the surface of the first lens facing the object side is a concave surface, and the surface of the first lens facing the image side is a concave surface;

a fifth lens having an optical power;

a sixth lens having an optical power;

wherein the effective focal length f of the image pickup lens and the effective focal length f3 of the third lens satisfy: f3/f is more than 1.5 and less than 5.0.

16. The imaging lens of claim 15, wherein a radius of curvature R3 of the object-side-facing surface of the second lens and a radius of curvature R11 of the object-side-facing surface of the sixth lens satisfy: -1.5 < R3/R11 < 0.5.

17. The imaging lens of claim 15, wherein a radius of curvature R3 of a surface of the second lens facing the object side and a radius of curvature R12 of a surface of the sixth lens facing the image side satisfy: -0.5 < R3/R12 < 1.5.

18. The imaging lens of claim 15, wherein a radius of curvature R6 of the image-side facing surface of the third lens and a radius of curvature R10 of the image-side facing surface of the fifth lens satisfy: 1.5 < R6/R10 < 7.5.

19. The imaging lens according to claim 15, wherein a center thickness CT1 of the first lens piece on an optical axis and a center thickness CT2 of the second lens piece on the optical axis satisfy: 1.0 < CT2/CT1 < 2.0.

20. The imaging lens according to claim 15, wherein a center thickness CT3 of the third lens on an optical axis, and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5.

21. The imaging lens of claim 15, wherein a radius of curvature R4 of a surface of the second lens facing the image side and a radius of curvature R5 of a surface of the third lens facing the object side satisfy: R4/R5 is more than or equal to 1.0 and less than or equal to 3.0.

22. The imaging lens according to claim 15, wherein an air interval T12 on an optical axis of the first lens and the second lens, and an air interval T23 on the optical axis of the second lens and the third lens satisfy: 1.0 < T12/T23 < 2.5.

23. The imaging lens according to claim 15, wherein a center thickness CT5 of the fifth lens on an optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 6.3 < CT5/T45 < 11.5.

24. The imaging lens according to claim 15, wherein an on-axis distance SAG61 between an intersection of an optical axis and a surface of the sixth lens facing the object side and an effective radius vertex of the surface of the sixth lens facing the object side, and a center thickness CT6 of the sixth lens on the optical axis satisfy: -2.0 < SAG61/CT6 < -0.5.

25. The imaging lens according to claim 15, wherein an abbe number V2 of the second lens, an abbe number V4 of the fourth lens, and an abbe number V6 of the sixth lens satisfy: v2+ V4+ V6 < 60.

26. The imaging lens according to claim 15, wherein an abbe number V1 of the first lens and an abbe number V3 of the third lens satisfy: v1+ V3 < 50.