CN217181309U

CN217181309U - Camera lens

Info

Publication number: CN217181309U
Application number: CN202123019342.2U
Authority: CN
Inventors: 李洋; 王浩; 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: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-08-12
Anticipated expiration: 2031-12-02

Abstract

The utility model provides a camera lens. The imaging lens includes: the surface of the first lens facing the object side is a concave surface; the second lens with focal power, the surface facing the image side is a concave surface; a diaphragm; a third lens having an optical power; a fourth lens with negative focal power, wherein the surface facing the object side is a concave surface; the fifth lens with focal power, the surface facing the image side is a convex surface; a sixth lens having an optical power; wherein, the first lens is a glass aspheric lens; an on-axis distance SAG51 between an intersection point of a surface of the fifth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the object side and an on-axis distance SAG52 between an intersection point of a surface of the fifth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the image side satisfy: -1.5 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.5. The utility model provides a camera lens among the prior art have high image quality, adapt to high low temperature environment ability and the big difficult problem of taking into account simultaneously of shooting scope.

Description

Camera lens

Technical Field

The utility model relates to an optical imaging equipment technical field particularly, relates to a camera lens.

Background

At present, with the requirement of the public on portability of intelligent equipment, the photographing function of a mobile phone is generally apt to be adopted to replace a traditional camera, so that the performance and the imaging quality of a mobile phone photographing module become the direction of research and development, a high-quality mobile phone camera lens not only needs to photograph a high-quality picture, but also adapts to different photographing environments, such as extreme thunderstorm weather or high and low temperature weather, and the like. Meanwhile, the shooting range of the camera lens is small, and the requirements of users are difficult to meet.

That is to say, the imaging lens in the prior art has the problems of high image quality, capability of adapting to high and low temperature environments, and large imaging range, which are difficult to be compatible at the same time.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a camera lens to solve the problem that camera lenses in the prior art have high image quality, adapt to high and low temperature environment ability and shooting range and are difficult to be taken into account simultaneously.

In order to achieve the above object, according to an aspect of the present invention, there is provided an imaging lens including, in order from an object side to an image side along an optical axis: the surface of the first lens facing the object side is a concave surface; the second lens with focal power, the surface facing the image side is a concave surface; a diaphragm; a third lens having an optical power; the surface of the fourth lens, which faces the object side, is a concave surface; the fifth lens with focal power, the surface facing the image side is a convex surface; a sixth lens having an optical power; wherein, the first lens is a glass aspheric lens; an on-axis distance SAG51 between an intersection point of a surface of the fifth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the object side and an on-axis distance SAG52 between an intersection point of a surface of the fifth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the image side satisfy: -1.5 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.5.

Further, the maximum field angle FOV of the imaging lens satisfies: FOV > 120.

Further, the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens satisfy the following conditions: f/EPD < 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 is less than 1.8.

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: 7.0 < (R1-R2)/(R1+ R2) ≦ 2.0.

Further, an on-axis distance SAG11 from an intersection point of the edge thickness ET1 of the first lens and the optical axis to an effective radius vertex of the surface of the first lens facing the object side satisfies: ET1/SAG11 is more than or equal to 2.0 and less than or equal to 3.0.

Further, an air space T12 of the first lens and the second lens on the optical axis, an air space T23 of the second lens and the third lens on the optical axis, an air space T34 of the third lens and the fourth lens on the optical axis, and an air space T45 of the fourth lens and the fifth lens on the optical axis satisfy: (T12+ T23)/(T34+ T45) is more than or equal to 2.0 and less than 3.0.

Further, the radius of curvature R7 of the surface of the fourth lens facing the object side and the effective focal length f4 of the fourth lens satisfy: r7/f4 is more than 0.5 and less than 4.0.

Further, a curvature radius R11 of a surface of the sixth lens facing the object side and a curvature radius R12 of a surface of the sixth lens facing the image side satisfy: 3.0 < (R11+ R12)/(R11-R12) < 8.0.

Further, the on-axis distance SAG52 from the central thickness CT5 of the fifth lens on the optical axis to the intersection point of the surface of the fifth lens facing the image side and the optical axis to the effective radius vertex of the surface of the fifth lens facing the image side satisfies: 2.0 < CT5/SAG52 < -1.5.

Further, the radius of curvature R5 of the surface of the third lens facing the object side and the effective focal length f3 of the third lens satisfy: r5/f3 is more than 1.0 and less than 1.5.

According to the utility model discloses an on the other hand provides a camera lens, includes in proper order by thing side to image side along the optical axis: the surface of the first lens facing the object side is a concave surface; the second lens with focal power, the surface facing the image side is a concave surface; a diaphragm; a third lens having an optical power; the surface of the fourth lens, which faces the object side, is a concave surface; a fifth lens with focal power, wherein the surface facing the image side is a convex surface; a sixth lens having an optical power; wherein, the first lens is a glass aspheric lens; the on-axis distance TTL from the surface of the first lens, which faces the object side, to the imaging surface and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following condition: TTL/ImgH is less than 1.8.

Further, an on-axis distance SAG51 between an intersection point of a surface of the fifth lens facing the object side and the optical axis to an effective radius vertex of the surface of the fifth lens facing the object side and an on-axis distance SAG52 between an intersection point of the surface of the fifth lens facing the image side and the optical axis to an effective radius vertex of the surface of the fifth lens facing the image side satisfy: -1.5 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.5; the maximum field angle FOV of the camera lens satisfies the following conditions: FOV > 120.

Further, the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens satisfy: f/EPD < 2.5.

By applying the technical scheme of the utility model, the camera lens comprises a first lens with negative focal power, a second lens with focal power, a diaphragm, a third lens with focal power, a fourth lens with negative focal power, a fifth lens with focal power and a sixth lens with focal power in turn from the object side to the image side along the optical axis; the surface of the first lens facing the object side is a concave surface; the surface of the second lens facing the image side is a concave surface; the surface of the fourth lens facing the object side is a concave surface; the surface of the fifth lens facing the image side is a convex surface; wherein, the first lens is a glass aspheric lens; an on-axis distance SAG51 between an intersection point of a surface of the fifth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the object side and an on-axis distance SAG52 between an intersection point of a surface of the fifth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the image side satisfy: -1.5 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.5.

Through the reasonable distribution of the focal power and the surface type of each lens, the wide-angle characteristic of the camera lens can be realized, the shooting range can be enlarged, and through the reasonable distribution of the focal power of each lens, the sensitivity can be effectively reduced, and the image quality can be improved. First lens is glass aspheric surface lens, can effectively control the temperature like this and float for camera lens can adapt to high microthermal environment, improves imaging quality simultaneously. By constraining the relation between the on-axis distance SAG51 from the intersection point of the surface of the fifth lens facing the object side and the optical axis to the effective radius vertex of the surface of the fifth lens facing the object side and the on-axis distance SAG52 from the intersection point of the surface of the fifth lens facing the image side and the optical axis to the effective radius vertex of the surface of the fifth lens facing the image side to be in a reasonable range, the processing characteristics of the fifth lens can be ensured, and the assembly of the imaging lens is facilitated.

In addition, the camera lens of the application mainly has four characteristics: the wide-angle camera lens has a wider shooting range compared with a common lens; secondly, the glass aspheric lens is added, so that the imaging quality can be improved, and the high-temperature and low-temperature environment can be adapted; thirdly, the large aperture can have better image quality in a darker environment; fourthly, the camera lens is ultra-thin, the whole volume of the camera lens is small, and the attractiveness is improved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention 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 4 respectively show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification 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, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens in fig. 5;

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

fig. 10 to 12 show an axial chromatic aberration curve, an astigmatism curve, and a magnification chromatic aberration curve of the imaging lens in fig. 9, respectively;

fig. 13 is a schematic structural view of an imaging lens according to a fourth example of the present invention;

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

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

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

Wherein the figures include the following reference numerals:

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; STO, stop; e3, third lens; s5, the object-side surface of the third lens; s6, the surface of the third lens facing the image side; 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 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 application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; 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 camera lens in order to solve among the prior art has high image quality, adapts to the problem that high low temperature environment ability and shooting scope are difficult to compromise simultaneously greatly, the utility model provides a camera lens.

Example one

As shown in fig. 1 to 20, the imaging lens includes, in order from an object side to an image side along an optical axis, a first lens having negative power, a second lens having negative power, a diaphragm, a third lens having negative power, a fourth lens having negative power, a fifth lens having negative power, and a sixth lens having negative power; the surface of the first lens facing the object side is a concave surface; the surface of the second lens facing the image side is a concave surface; the surface of the fourth lens facing the object side is a concave surface; the surface of the fifth lens facing the image side is a convex surface; wherein, the first lens is a glass aspheric lens; an on-axis distance SAG51 between an intersection point of a surface of the fifth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the object side and an on-axis distance SAG52 between an intersection point of a surface of the fifth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the image side satisfy: -1.5 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.5.

Preferably, -1.2 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.9.

In the present embodiment, the maximum field angle FOV of the imaging lens satisfies: FOV > 120. By reasonably restricting the maximum field angle FOV of the camera lens within a certain range, the wide-angle characteristic can be met, the obtained object information is effectively expanded, and the shooting range is expanded. Preferably, the FOV is >123.5 °.

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 < 2.5. The ratio between the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens is restricted within a reasonable range, so that the characteristic of a large aperture can be realized, and the camera lens can have better image quality in a dark environment. Preferably, f/EPD < 2.3.

In this embodiment, an on-axis distance TTL from a surface of the first lens facing the object side to the imaging plane satisfies, with ImgH, half of a diagonal length of the effective pixel area on the imaging plane: TTL/ImgH is less than 1.8. The ratio between the axial 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 is in a reasonable range, so that the whole camera lens has a smaller size, the characteristic of miniaturization is guaranteed, and the appearance attractiveness of the camera lens is improved. Preferably, TTL/ImgH < 1.7.

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: 7.0 < (R1-R2)/(R1+ R2) ≦ 2.0. Satisfying this conditional expression, can controlling the crooked degree of first lens, on the basis of guaranteeing camera lens wide angle characteristic, making first lens have better contour machining characteristic. Preferably-6.8 < (R1-R2)/(R1+ R2) ≦ 2.0.

In this embodiment, the on-axis distance SAG11 from the intersection point of the edge thickness ET1 of the first lens and the optical axis to the effective radius vertex of the surface of the first lens facing the object side satisfies: ET1/SAG11 is more than or equal to 2.0 and less than or equal to 3.0. The condition is satisfied, the edge thickness of the first lens can be controlled, and the first lens has better molding processing characteristics. Preferably, 2.0. ltoreq. ET1/SAG11 < 2.8.

In the present embodiment, an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: (T12+ T23)/(T34+ T45) is more than or equal to 2.0 and less than 3.0. The condition is satisfied, the space between each lens can be reasonably distributed, the aberration is reduced, and the assembling performance is improved. Preferably, 2.0 ≦ (T12+ T23)/(T34+ T45) < 2.8.

In the present embodiment, a radius of curvature R7 of the surface of the fourth lens facing the object side and an effective focal length f4 of the fourth lens satisfy: r7/f4 is more than 0.5 and less than 4.0. The curvature and the focal power of the fourth lens can be ensured, the forming processability of the fourth lens can be improved, and meanwhile, the aberration is reduced. Preferably, 0.8 < R7/f4 < 3.6.

In this embodiment, a radius of curvature R11 of a surface of the sixth lens facing the object side and a radius of curvature R12 of a surface of the sixth lens facing the image side satisfy: 3.0 < (R11+ R12)/(R11-R12) < 8.0. Satisfying the conditional expression, the curvature and the focal power of the sixth lens can be ensured, the molding processability of the sixth lens can be improved, and the aberration can be reduced. Preferably 3.2 < (R11+ R12)/(R11-R12) < 7.5.

In the present embodiment, the on-axis distance SAG52 between the central thickness CT5 of the fifth lens on the optical axis and the intersection point of the surface of the fifth lens facing the image side and the optical axis to the effective radius vertex of the surface of the fifth lens facing the image side satisfies: 2.0 < CT5/SAG52 < -1.5. The condition is satisfied, the center thickness of the fifth lens can be ensured, and the forming processability of the fifth lens can be improved. Preferably, -1.8 < CT5/SAG52 < -1.5.

In the present embodiment, a radius of curvature R5 of the surface of the third lens facing the object side and an effective focal length f3 of the third lens satisfy: 1.0 < R5/f3 < 1.5. Satisfying the conditional expression, the curvature and focal power of the third lens can be ensured, the forming processability of the third lens can be improved, and the aberration can be reduced. Preferably, 1.1 < R5/f3 < 1.3.

Example two

As shown in fig. 1 to 20, the imaging lens includes, in order from an object side to an image side along an optical axis, a first lens having negative power, a second lens having negative power, a diaphragm, a third lens having negative power, a fourth lens having negative power, a fifth lens having negative power, and a sixth lens having negative power; the surface of the first lens facing the object side is a concave surface; the surface of the second lens facing the image side is a concave surface; the surface of the fourth lens facing the object side is a concave surface; the surface of the fifth lens facing the image side is a convex surface; wherein, the first lens is a glass aspheric lens; the on-axis distance TTL from the surface of the first lens, which faces the object side, to the imaging surface and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following condition: TTL/ImgH is less than 1.8.

Preferably, TTL/ImgH < 1.7.

Through the reasonable distribution of the focal power and the surface type of each lens, the wide-angle characteristic of the camera lens can be realized, the shooting range can be enlarged, and through the reasonable distribution of the focal power of each lens, the sensitivity can be effectively reduced, and the image quality can be improved. First lens is glass aspheric surface lens, can effectively control the temperature like this and float for camera lens can adapt to high microthermal environment, improves imaging quality simultaneously. The ratio between the axial distance TTL from the surface facing the object side of the first lens to the imaging surface and the half of the diagonal length ImgH of the effective pixel area on the imaging surface is within a reasonable range, so that the whole camera lens has a smaller size, the characteristic of miniaturization is ensured, and the attractive appearance of the camera lens is improved.

In this embodiment, an on-axis distance SAG51 between an intersection point of a surface of the fifth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the object side and an on-axis distance SAG52 between an intersection point of the surface of the fifth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the image side satisfy: -1.5 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.5. By constraining the relational expression between the axial distance SAG51 between the effective radius peak of the surface facing the object side of the fifth lens and the intersection point of the optical axis and the surface facing the image side of the fifth lens and the axial distance SAG52 between the effective radius peak of the surface facing the image side of the fifth lens and the intersection point of the optical axis and the surface facing the image side of the fifth lens to be in a reasonable range, the processing characteristics of the fifth lens can be ensured, and the assembly of the imaging lens is facilitated. Preferably, -1.2 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.9.

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 < 2.5. The ratio between the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens is restricted within a reasonable range, so that the characteristic of a large aperture can be realized, and the camera lens can have better image quality in a dark environment. Preferably, f/EPD < 2.3.

In the present embodiment, the air space T12 of the first lens and the second lens on the optical axis, the air space T23 of the second lens and the third lens on the optical axis, the air space T34 of the third lens and the fourth lens on the optical axis, and the air space T45 of the fourth lens and the fifth lens on the optical axis satisfy: (T12+ T23)/(T34+ T45) is more than or equal to 2.0 and less than 3.0. The condition is satisfied, the space between each lens can be reasonably distributed, the aberration is reduced, and the assembling performance is improved. Preferably, 2.0 ≦ (T12+ T23)/(T34+ T45) < 2.8.

In the present embodiment, a radius of curvature R5 of the surface of the third lens facing the object side and an effective focal length f3 of the third lens satisfy: r5/f3 is more than 1.0 and less than 1.5. Satisfying the conditional expression, the curvature and focal power of the third lens can be ensured, the forming processability of the third lens can be improved, and the aberration can be reduced. Preferably, 1.1 < R5/f3 < 1.3.

The above-described image pickup lens may further optionally include a filter for correcting color deviation 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 left side is the object side and the right side is the image side.

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 five 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 a configuration of an imaging lens 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 plane S15.

The first lens E1 has negative power, and its object-side surface S1 is concave, and its image-side surface S2 is concave. The second lens E2 has positive power, the object-facing surface S3 of the second lens is convex, and the image-facing surface S4 of the second lens is concave. 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 convex surface, and its image-side surface S12 is a concave 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. 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 2.23mm, the half of the maximum field angle Semi-FOV of the camera lens is 61.8 °, the total length TTL of the camera lens is 5.10mm and the image height ImgH is 3.03 mm.

Table 1 shows a basic structural parameter table of the imaging lens of example one, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius 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 that can be used for each of the aspherical mirrors S1-S12 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.0424E-01

-9.0866E-02

1.4898E-02

-4.0384E-03

1.4911E-03

-4.4438E-04

7.9689E-05

0.0000E+00

S2

3.4637E-01

-7.2403E-02

6.7766E-03

2.2450E-03

1.1290E-03

-5.8529E-04

-3.0635E-04

0.0000E+00

S3

8.8537E-03

-1.5522E-03

5.6103E-03

1.7545E-03

5.1940E-04

-3.8642E-05

-2.1657E-05

0.0000E+00

S4

3.3969E-02

8.0082E-03

2.7622E-03

8.5033E-04

2.7828E-04

6.5475E-05

1.5826E-05

0.0000E+00

S5

3.0905E-04

-8.2125E-04

3.1888E-05

7.4027E-05

2.3994E-05

4.1550E-07

4.8040E-07

-1.6399E-06

-3.0197E-07

S6

-1.0343E-01

2.8324E-03

2.5721E-04

6.4694E-04

1.3970E-04

7.4236E-05

1.5543E-05

5.4978E-06

1.2486E-07

S7

-1.8286E-01

2.0652E-02

6.8978E-04

1.0700E-03

-3.9648E-05

-1.2840E-05

-1.7161E-05

-1.4182E-06

4.0068E-07

S8

-1.3656E-01

3.1928E-02

-1.8208E-03

1.9324E-03

3.1595E-06

5.1093E-05

3.8629E-06

-5.1961E-06

-5.4452E-06

S9

-3.0739E-02

7.3131E-03

-5.4964E-03

-7.8508E-05

-5.7199E-04

-1.2895E-04

-5.4906E-05

-3.5709E-05

-1.5024E-05

S10

2.7853E-01

8.8914E-02

-1.9195E-02

-3.2600E-03

-3.2538E-03

9.8022E-04

8.4502E-05

1.0864E-04

-7.7014E-05

S11

-1.0227E+00

1.6730E-01

1.6581E-02

6.8602E-03

-1.1375E-02

-2.9238E-03

7.5993E-04

1.0193E-03

3.4505E-04

S12

-1.3496E+00

1.3112E-01

-6.0641E-02

3.0610E-02

-3.7001E-03

6.6196E-03

3.4961E-04

1.1831E-03

-9.5467E-05

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 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 image capturing lens system 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 plane S15.

The first lens E1 has negative power, and its object-side surface S1 is concave, and its image-side surface S2 is concave. The second lens E2 has positive power, the object-facing surface S3 of the second lens is convex, and the image-facing surface S4 of the second lens is concave. 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 convex 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 camera lens is 1.88mm, the half of the maximum field angle Semi-FOV of the camera lens is 61.9 °, the total length TTL of the camera lens is 5.00mm and the image height ImgH is 3.03 mm.

Table 3 shows a basic structural parameter table of the imaging lens of example two, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius are all 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

A18

A20

S1

4.0890E-01

-7.5079E-02

1.5270E-02

-4.3542E-03

1.1791E-03

-3.3977E-04

5.7407E-05

0.0000E+00

S2

3.4048E-01

-5.9925E-02

7.1597E-04

-8.8266E-04

1.0424E-03

9.8282E-05

-6.5177E-06

0.0000E+00

S3

1.1434E-02

-1.2228E-02

-3.3362E-04

1.0579E-04

2.9436E-04

3.9064E-05

7.5348E-06

0.0000E+00

S4

2.4011E-02

4.4243E-04

3.1925E-04

9.5938E-05

6.5155E-05

1.2676E-05

8.7266E-06

0.0000E+00

S5

1.9603E-03

-1.2961E-03

-3.2670E-04

-7.7172E-05

-2.0319E-05

-2.3246E-06

1.9147E-06

2.9963E-06

1.9138E-06

S6

-9.1609E-02

-7.1384E-03

-1.1999E-03

-1.6392E-04

-1.7499E-04

-2.1882E-05

-1.2013E-05

-1.2191E-05

4.7529E-06

S7

-1.7019E-01

3.4759E-03

-3.8646E-04

1.5988E-03

-2.0986E-05

1.7734E-04

2.8818E-05

2.7115E-05

-3.4122E-06

S8

-1.3727E-01

2.2353E-02

-3.2369E-03

1.8097E-03

-4.2231E-04

1.1802E-04

-1.5311E-05

1.3533E-06

-1.4437E-07

S9

-4.5877E-02

1.0555E-02

-5.5567E-03

6.7733E-04

-2.1502E-04

-5.8710E-05

6.7772E-05

-2.9115E-05

6.1106E-06

S10

3.1972E-01

9.8817E-02

-1.8357E-02

9.5872E-04

-1.5446E-03

1.4342E-03

-5.5368E-04

2.4130E-04

-4.9793E-05

S11

-1.9273E+00

3.1203E-01

-4.2050E-02

2.4004E-02

-9.8212E-03

2.4599E-04

-1.2951E-03

1.3842E-03

-3.1095E-04

S12

-1.4032E+00

1.7517E-01

-6.6208E-02

2.4144E-02

-4.9131E-03

1.8415E-03

-5.1476E-04

5.1734E-04

-2.5034E-04

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 astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example two. Fig. 8 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. 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 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 plane S15.

The first lens E1 has negative power, and its object-side surface S1 is concave, 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 convex and the image-facing surface S4 of the second lens element is concave. 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 convex surface, and its image-side surface S12 is a concave 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. 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 1.94mm, the half Semi-FOV of the maximum field angle of the camera lens is 63.5 °, the total length TTL of the camera lens is 5.00mm and the image height ImgH is 3.03 mm.

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.1679E-01

-8.7850E-02

1.6654E-02

-4.5800E-03

1.3938E-03

-4.4767E-04

1.0283E-04

0.0000E+00

S2

3.6140E-01

-7.1213E-02

2.8163E-03

2.0572E-03

1.6463E-03

-2.3325E-04

-1.9461E-04

0.0000E+00

S3

1.5487E-02

-9.7312E-03

8.5214E-03

3.4984E-03

2.4340E-04

-5.7418E-04

-1.7655E-04

0.0000E+00

S4

3.7145E-02

4.9584E-03

2.5884E-03

1.0277E-03

3.3669E-04

7.8696E-05

2.3131E-05

0.0000E+00

S5

3.0971E-03

-2.0624E-03

-3.2150E-04

1.0087E-04

1.4772E-04

1.0892E-04

5.6977E-05

2.4027E-05

5.1033E-06

S6

-1.0597E-01

-4.8626E-03

-3.9691E-04

-1.9886E-04

-2.1768E-04

-1.2225E-05

1.5944E-05

6.0993E-06

7.6947E-06

S7

-1.8806E-01

1.2462E-02

4.3201E-03

2.4206E-03

-6.4711E-05

2.2687E-04

3.1662E-05

1.2579E-05

-3.3812E-05

S8

-1.3786E-01

3.1179E-02

-1.6244E-03

2.7175E-03

-4.3615E-04

2.0309E-04

9.0793E-06

2.9390E-05

-3.3559E-06

S9

-3.4834E-02

9.9059E-03

-5.9574E-03

7.0306E-04

-1.3001E-04

-1.3237E-04

4.7610E-05

-1.6113E-05

5.8403E-07

S10

2.6348E-01

9.1852E-02

-1.5932E-02

-5.1128E-04

-1.4343E-03

1.1826E-03

-4.3324E-04

1.8168E-04

-4.2327E-05

S11

-1.0311E+00

1.6418E-01

7.9336E-03

4.2157E-03

-6.7159E-03

-1.7796E-03

9.3643E-04

9.0531E-04

-4.1458E-04

S12

-1.4161E+00

1.5371E-01

-6.4166E-02

2.3231E-02

-4.2232E-03

1.6641E-03

2.9001E-04

2.6559E-05

-1.3775E-04

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 astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example three. 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 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 plane S15.

The first lens E1 has negative power, and its object-side surface S1 is concave, and its image-side surface S2 is concave. The second lens E2 has positive power, the object-facing surface S3 of the second lens is convex, and the image-facing surface S4 of the second lens is concave. 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 concave, 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 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 1.89mm, the half of the maximum field angle Semi-FOV of the imaging lens is 63.0 °, the total length TTL of the imaging lens is 5.00mm and the image height ImgH is 3.03 mm.

Table 7 shows a basic structural parameter table of the imaging lens of example four, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

7.6870E-01

-1.4949E-01

3.5253E-02

-1.0898E-02

3.6350E-03

-1.3642E-03

5.0568E-04

-1.6864E-04

3.1443E-05

S2

4.0583E-01

-8.4718E-02

6.5820E-03

1.3765E-03

1.3878E-03

-4.9671E-04

-1.4918E-04

0.0000E+00

S3

6.0465E-02

-1.0973E-03

9.5028E-03

3.1635E-03

2.3497E-04

-4.8000E-04

-1.2786E-04

0.0000E+00

S4

4.9092E-02

7.2094E-03

2.7388E-03

7.7402E-04

1.3346E-04

0.0000E+00

S5

7.9844E-03

-8.9730E-04

-4.5019E-06

1.2363E-04

6.9901E-05

2.7761E-05

5.0166E-06

9.8979E-08

0.0000E+00

S6

-1.3913E-01

-4.6447E-03

1.6452E-03

4.1007E-04

0.0000E+00

S7

-1.9618E-01

7.9981E-03

5.4612E-03

1.3756E-03

-2.1123E-04

-1.2981E-04

-4.7877E-05

-2.8323E-05

-2.7969E-05

S8

-1.0153E-01

1.7318E-02

3.4440E-03

9.5679E-05

5.7083E-04

-2.4553E-04

1.0731E-04

0.0000E+00

S9

5.1254E-02

-1.3431E-02

1.5587E-03

-2.6962E-03

1.1420E-03

-7.3380E-04

1.7772E-04

-5.1087E-05

0.0000E+00

S10

3.2825E-01

1.3216E-01

3.3157E-03

4.2236E-03

3.7922E-03

2.5635E-03

6.8429E-04

4.8281E-04

4.0578E-04

S11

-1.7923E+00

2.7423E-01

-1.4763E-02

1.4442E-02

-8.6275E-03

-4.4520E-03

1.0145E-03

2.5858E-03

9.7260E-04

S12

-3.2034E+00

4.4622E-01

-1.4578E-01

4.9956E-02

-7.2614E-03

4.8050E-03

-1.1089E-04

1.5935E-04

-9.8034E-05

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 astigmatism curves of the imaging lens of example four, which represent meridional field curvature and sagittal field curvature. 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 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 plane S15.

The first lens E1 has negative power, and its object-side surface S1 is concave, and its image-side surface S2 is concave. The second lens E2 has positive power, the object-facing surface S3 of the second lens is convex, and the image-facing surface S4 of the second lens is concave. The third lens E3 has positive power, and the object-facing surface S5 of the third lens is a convex surface, and the image-facing surface S6 of the third lens 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 concave, and its image-side surface S10 is convex. The sixth lens E6 has negative power, and its object-side surface S11 is a convex surface, and its image-side surface S12 is a concave 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. 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 1.87mm, the half Semi-FOV of the maximum field angle of the camera lens is 63.5 °, the total length TTL of the camera lens is 5.05mm and the image height ImgH is 3.03 mm.

Table 9 shows a basic structural parameter table of the imaging lens of example five, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius 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.

TABLE 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 astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example five. 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.

To sum up, examples one to five respectively satisfy the relationships shown in table 11.

Conditional formula/example	1	2	3	4	5
						(SAG51-SAG52)/(SAG51+SAG52)	-1.19	-1.03	-0.93	-0.93	-0.93
FOV	123.5	123.7	127.0	126.0	127.0
						f/EPD	2.27	2.19	2.20	2.20	2.15
TTL/ImgH	1.68	1.65	1.65	1.65	1.67
						(R1-R2)/(R1+R2)	-6.70	-2.14	-2.35	-2.09	-2.44
ET1/SAG11	2.02	2.42	2.77	2.29	2.49
						(T12+T23)/(T34+T45)	2.69	2.17	2.04	2.44	2.59
R7/f4	3.52	1.82	1.46	0.91	0.83
						(R11+R12)/(R11-R12)	3.25	6.20	5.67	6.43	5.84
CT5/SAG52	-1.79	-1.67	-1.60	-1.55	-1.55
						R5/f3	1.19	1.23	1.19	1.21	1.22

TABLE 11

Table 12 gives effective focal lengths f of the imaging lenses of examples one to five, effective focal lengths f1 to f6 of the respective lenses, and the like.

Parameter/example	1	2	3	4	5
						f(mm)	2.23	1.88	1.94	1.89	1.87
f1(mm)	-3.70	-3.01	-3.12	-3.03	-2.91
						f2(mm)	9.44	5.39	5.80	5.38	5.15
f3(mm)	2.49	2.63	2.66	2.71	2.66
						f4(mm)	-3.48	-3.83	-5.02	-6.60	-6.64
f5(mm)	2.04	2.19	2.36	2.75	2.68
						f6(mm)	-4.71	-11.55	-9.08	-16.17	-12.93
TTL(mm)	5.10	5.00	5.00	5.00	5.05
						ImgH(mm)	3.03	3.03	3.03	3.03	3.03
Semi-FOV(°)	61.8	61.9	63.5	63.0	63.5

TABLE 12

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 obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to 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, in order from an object side to an image side along an optical axis:

the surface of the first lens facing the object side is a concave surface;

the second lens with focal power, the surface facing the image side is a concave surface;

a diaphragm;

a third lens having an optical power;

the surface of the fourth lens, which faces the object side, is a concave surface;

a fifth lens with focal power, wherein the surface facing the image side is a convex surface;

a sixth lens having an optical power;

wherein the first lens is a glass aspheric lens; an on-axis distance SAG51 between an intersection point of a surface of the fifth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the object side and an on-axis distance SAG52 between an intersection point of the surface of the fifth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the image side satisfy: -1.5 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.5.

2. The imaging lens according to claim 1, wherein a maximum field angle FOV of the imaging lens satisfies: FOV >120 deg.

3. 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 < 2.5.

4. The imaging lens according to claim 1, wherein an on-axis distance TTL from a surface of the first lens element facing the object side to an imaging surface to a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfies: TTL/ImgH is less than 1.8.

5. 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: 7.0 < (R1-R2)/(R1+ R2) ≦ 2.0.

6. The imaging lens according to claim 1, wherein an on-axis distance SAG11 from an intersection point of an edge thickness ET1 of the first lens and the optical axis with the object side surface of the first lens to an effective radius vertex of the object side surface of the first lens satisfies: ET1/SAG11 is more than or equal to 2.0 and less than or equal to 3.0.

7. The imaging lens according to claim 1, wherein an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: (T12+ T23)/(T34+ T45) is more than or equal to 2.0 and less than 3.0.

8. The imaging lens according to claim 1, wherein a radius of curvature R7 of a surface of the fourth lens facing the object side and an effective focal length f4 of the fourth lens satisfy: r7/f4 is more than 0.5 and less than 4.0.

9. The imaging lens according to claim 1, wherein a radius of curvature R11 of a surface of the sixth lens facing the object side and a radius of curvature R12 of a surface of the sixth lens facing the image side satisfy: 3.0 < (R11+ R12)/(R11-R12) < 8.0.

10. The imaging lens according to claim 1, wherein an on-axis distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and an intersection point of an image-side-facing surface of the fifth lens and the optical axis to an effective radius vertex of the image-side-facing surface of the fifth lens satisfies: 2.0 < CT5/SAG52 < -1.5.

11. The imaging lens according to claim 1, wherein a radius of curvature R5 of a surface of the third lens facing the object side and an effective focal length f3 of the third lens satisfy: r5/f3 is more than 1.0 and less than 1.5.

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

the surface of the first lens facing the object side is a concave surface;

a diaphragm;

a third lens having an optical power;

the fifth lens with focal power, the surface facing the image side is a convex surface;

a sixth lens having an optical power;

wherein the first lens is a glass aspheric lens; 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 the following condition: TTL/ImgH is less than 1.8.

13. The imaging lens according to claim 12, wherein an on-axis distance SAG51 between an intersection point of the surface of the fifth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the object side and an on-axis distance SAG52 between an intersection point of the surface of the fifth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fifth lens facing the image side satisfy: -1.5 < (SAG51-SAG52)/(SAG51+ SAG52) < -0.5; the maximum field angle FOV of the camera lens satisfies the following conditions: FOV > 120.

14. The imaging lens of claim 12, wherein an effective focal length f of the imaging lens and an entrance pupil diameter EPD of the imaging lens satisfy: f/EPD < 2.5.

15. The imaging lens of claim 12, 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: 7.0 < (R1-R2)/(R1+ R2) ≦ 2.0.

16. The imaging lens according to claim 12, wherein an on-axis distance SAG11 from an intersection point of an edge thickness ET1 of the first lens and the optical axis with the object side surface of the first lens to an effective radius vertex of the object side surface of the first lens satisfies: ET1/SAG11 is more than or equal to 2.0 and less than or equal to 3.0.

17. The imaging lens according to claim 12, wherein an air space T12 on the optical axis of the first lens and the second lens, an air space T23 on the optical axis of the second lens and the third lens, an air space T34 on the optical axis of the third lens and the fourth lens, and an air space T45 on the optical axis of the fourth lens and the fifth lens satisfy: (T12+ T23)/(T34+ T45) is more than or equal to 2.0 and less than 3.0.

18. The imaging lens according to claim 12, wherein a radius of curvature R7 of a surface of the fourth lens facing the object side and an effective focal length f4 of the fourth lens satisfy: r7/f4 is more than 0.5 and less than 4.0.

19. The imaging lens of claim 12, wherein a radius of curvature R11 of a surface of the sixth lens facing the object side and a radius of curvature R12 of a surface of the sixth lens facing the image side satisfy: 3.0 < (R11+ R12)/(R11-R12) < 8.0.

20. The imaging lens of claim 12, wherein an on-axis distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and an intersection point of an image-facing surface of the fifth lens and the optical axis to an effective radius vertex of the image-facing surface of the fifth lens satisfies: 2.0 < CT5/SAG52 < -1.5.

21. The imaging lens according to claim 12, wherein a radius of curvature R5 of a surface of the third lens facing the object side and an effective focal length f3 of the third lens satisfy: r5/f3 is more than 1.0 and less than 1.5.