CN216792556U

CN216792556U - Camera lens

Info

Publication number: CN216792556U
Application number: CN202220112585.6U
Authority: CN
Inventors: 李洋; 王浩; 邢天祥; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-06-21
Anticipated expiration: 2032-01-17

Abstract

The utility model provides a camera lens. The imaging lens includes: a first lens having a focal power; a second lens having a negative focal power; a third lens having a negative focal power; a fourth lens having a focal power; a fifth lens having a focal power; a sixth lens having a focal power; a seventh lens having an optical power; the first lens is made of glass; the surface of the sixth lens facing the object side is a convex surface, and the surface facing the image side is a concave surface; the surface of the seventh lens facing the object side is a concave surface; the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following requirements: f/EPD is less than 1.7; 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 1.3. The utility model solves the problem that the camera lens in the prior art has high pixel, large aperture and large image surface which are difficult to simultaneously consider.

Description

Camera lens

Technical Field

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

Background

At present, with the synchronous development of life and science and technology, various portable electronic products gradually step into the life of people, taking smart phones, tablet computers and the like as examples, wherein due to the fact that people have higher requirements on the photographing quality of smart phones, most smart phone terminal manufacturers have higher and higher requirements on the specification of a rear main camera lens, the whole size is ensured to be smaller, and the light weight and the thinness are met; a large imaging surface is ensured, and a better imaging effect is ensured; meanwhile, the requirements of night shooting, high-temperature and low-temperature shooting and the like can be met. The existing camera lens is difficult to balance in imaging quality, production efficiency, production cost and the like, and brings great challenges to manufacturers for manufacturing the camera lens.

That is, the imaging lens in the related art has a problem that it is difficult to simultaneously achieve high pixels, a large aperture, and a large image plane.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an imaging lens, which solves the problem that the imaging lens in the prior art is difficult to simultaneously give consideration to high pixels, large aperture and large image plane.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens comprising, in order from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having a negative focal power; a third lens having a negative focal power; a fourth lens having an optical power; a fifth lens having an optical power; a sixth lens having an optical power; a seventh lens having an optical power; wherein the first lens is made of glass; the surface of the sixth lens facing the object side is a convex surface, and the surface facing the image side is a concave surface; the surface of the seventh lens facing the object side is a concave surface; the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following requirements: f/EPD is less than 1.7; 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 1.3.

Further, the effective focal length f of the image pickup lens and the effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0.

Further, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5.

Further, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5.

Further, a curvature radius R3 of a surface of the second lens facing the object side and a curvature radius R4 of a surface of the second lens facing the image side satisfy: 8.0 < (R3+ R4)/(R3-R4) < 9.0.

Further, a curvature radius R5 of a surface of the third lens facing the object side and a curvature radius R10 of a surface of the fifth lens facing the image side satisfy: 7.5 < R5/R10 < 8.5.

Further, a curvature radius R8 of a surface of the fourth lens facing the image side and a curvature radius R11 of a surface of the sixth lens facing the object side satisfy: -10.0 < R8/R11 < -9.0.

Further, the radius of curvature R9 of the surface of the fifth lens facing the object side and the radius of curvature R11 of the surface of the sixth lens facing the object side satisfy: 6.0 < R9/R11 < 7.0.

Further, a curvature radius R13 of a surface of the seventh lens facing the object side and a curvature radius R14 of a surface of the seventh lens facing the image side satisfy: -6.0 < R14/R13 < -4.5.

Further, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the following condition: f2/f5 is more than 6.0 and less than 7.0.

Further, half of the Semi-FOV of the maximum field angle of the imaging lens satisfies: the Semi-FOV is more than or equal to 40.0 degrees.

According to another aspect of the present invention, there is provided an imaging lens including, in order from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having a negative focal power; a third lens having a negative focal power; a fourth lens having an optical power; a fifth lens having an optical power; a sixth lens having an optical power; a seventh lens having an optical power; wherein the first lens is made of glass; the surface of the sixth lens facing the object side is a convex surface, and the surface facing the image side is a concave surface; the surface of the seventh lens facing the object side is a concave surface; 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 1.3; half of the Semi-FOV of the maximum field angle of the camera lens satisfies: the Semi-FOV is more than or equal to 40.0 degrees.

Further, the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens satisfy: f/EPD is less than 1.7; the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy the following condition: 4.5 < f4/f6 < 5.5.

By applying the technical scheme of the utility model, the camera lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens has focal power; the second lens has negative focal power; the third lens has negative focal power; the fourth lens has focal power; the fifth lens has focal power; the sixth lens has focal power; the seventh lens has focal power; wherein the first lens is made of glass; the surface of the sixth lens facing the object side is a convex surface, and the surface facing the image side is a concave surface; the surface of the seventh lens facing the object side is a concave surface; the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following requirements: f/EPD is less than 1.7; 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 1.3.

By controlling the focal power, the surface type and the material of each lens, the image resolution can be improved, and the camera lens can still maintain perfect image resolution within a larger temperature variation range. 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 of a system can be realized, better image quality can be ensured in a dark environment, and the function of night shooting is realized. 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 miniaturization is met, and meanwhile, the appearance attractiveness of the camera lens can be improved. In addition, the camera lens is a seven-piece ultrathin glass-plastic mixed camera lens with high pixels, a large image plane and a large aperture, and can better meet the use requirements of various special scenes.

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

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

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

fig. 11 is a schematic diagram showing a configuration of an imaging lens of example three of the present invention;

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

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

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

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

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

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

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

Wherein the figures include the following reference numerals:

STO, stop; e1, a first lens; s1, the object-side surface of the first lens; s2, the surface of the first lens facing the image side; e2, a second lens; s3, an object-side surface of the second lens; s4, the surface of the second lens facing the image side; e3, third lens; s5, an object-side surface of the third lens; s6, an image-side surface of the third lens element; e4, fourth lens; s7, the object-side surface of the fourth lens; s8, the surface of the fourth lens facing the image side; e5, fifth lens; s9, the object-side surface of the fifth lens; s10, the surface of the fifth lens facing the image side; e6, sixth lens; s11, the object-side surface of the sixth lens element; s12, an image-side surface of the sixth lens element; e7, seventh lens; s13, the object-side surface of the seventh lens; s14, the surface of the seventh lens facing the image side; e8, optical filters; s15, the surface of the filter facing the object side; s16, the surface of the filter facing the image side; and S17, imaging surface.

Detailed Description

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

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the 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 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 utility model provides an imaging lens, aiming at solving the problem that the imaging lens in the prior art is difficult to simultaneously give consideration to high pixels, a large aperture and a large image plane.

Example one

As shown in fig. 1 to 30, the image capturing lens includes, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, where the first lens has a power; the second lens has negative focal power; the third lens has negative focal power; the fourth lens has focal power; the fifth lens has focal power; the sixth lens has focal power; the seventh lens has focal power; wherein the first lens is made of glass; the surface of the sixth lens facing the object side is a convex surface, and the surface facing the image side is a concave surface; the surface of the seventh lens facing the object side is a concave surface; the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following requirements: f/EPD is less than 1.7; 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 1.3.

By controlling the focal power, the surface type and the material of each lens, the image resolution can be improved, and the camera lens can still maintain perfect image resolution within a larger temperature variation range. The characteristic of a large aperture of a system can be realized by restricting the ratio of the effective focal length f of the camera lens to the entrance pupil diameter EPD of the camera lens within a reasonable range, so that the camera can have better image quality in a dark environment and realize the function of night shooting. 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 miniaturization is met, and meanwhile, the appearance attractiveness of the camera lens can be improved. In addition, the camera lens is a seven-piece ultrathin glass-plastic mixed camera lens with high pixels, a large image plane and a large aperture, and can better meet the use requirements of various special scenes.

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0. The relation between the effective focal length f of the camera lens and the effective focal length f2 of the second lens is restrained within a reasonable range, so that the reasonable distribution of the focal power of the second lens is guaranteed, the aberration is reduced, and the imaging quality is improved. Preferably, -7.8 < f2/f < -7.4.

In the present embodiment, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5. By restricting the ratio of the effective focal length f3 of the third lens to the effective focal length f6 of the sixth lens within a reasonable range, the reasonable distribution of the focal powers of the third lens and the sixth lens can be ensured, which is beneficial to reducing aberration and improving imaging quality. Preferably, -8.4 < f3/f6 < -7.9.

In the present embodiment, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5. The conditional expression is satisfied, the distribution of the focal power of the fourth lens and the focal power of the sixth lens can be ensured, the total aberration can be reduced, and the imaging quality can be improved. Preferably, 4.9 < f4/f6 < 5.3.

In this embodiment, a radius of curvature R3 of the surface of the second lens facing the object side and a radius of curvature R4 of the surface of the second lens facing the image side satisfy: 8.0 < (R3+ R4)/(R3-R4) < 9.0. Satisfying the conditional expression, the curvature and the focal power of the second lens can be ensured, the molding processability of the second lens can be improved, and the aberration can be reduced. Preferably, 8.3 < (R3+ R4)/(R3-R4) < 8.9.

In this embodiment, a radius of curvature R5 of the surface of the third lens facing the object side and a radius of curvature R10 of the surface of the fifth lens facing the image side satisfy: 7.5 < R5/R10 < 8.5. The curvature of the third lens and the curvature of the fifth lens can be guaranteed by meeting the conditional expression, so that the processability of the third lens and the fifth lens can be guaranteed, the off-axis aberration can be reduced, and the imaging quality is improved. Preferably 7.6 < R5/R10 < 8.1.

In this embodiment, a radius of curvature R8 of the surface of the fourth lens facing the image side and a radius of curvature R11 of the surface of the sixth lens facing the object side satisfy: -10.0 < R8/R11 < -9.0. The curvature of the fourth lens and the curvature of the sixth lens can be guaranteed, the processability of the fourth lens and the sixth lens can be guaranteed, the off-axis aberration can be reduced, and the imaging quality can be improved. Preferably, -10.0 < R8/R11 < -9.4.

In this embodiment, a radius of curvature R9 of the surface of the fifth lens facing the object side and a radius of curvature R11 of the surface of the sixth lens facing the object side satisfy: 6.0 < R9/R11 < 7.0. The curvature of the fifth lens and the curvature of the sixth lens can be guaranteed, the processability of the fifth lens and the sixth lens can be guaranteed, off-axis aberration can be effectively reduced, and imaging quality is guaranteed. Preferably, 6.1 < R9/R11 < 6.6.

In this embodiment, a radius of curvature R13 of a surface of the seventh lens facing the object side and a radius of curvature R14 of a surface of the seventh lens facing the image side satisfy: -6.0 < R14/R13 < -4.5. Satisfying the conditional expression, the curvature and the focal power of the seventh lens can be ensured, the molding processability of the seventh lens can be improved, and the aberration can be reduced. Preferably, -5.6 < R14/R13 < -4.8.

In the present embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: f2/f5 is more than 6.0 and less than 7.0. Satisfying this conditional expression, can guaranteeing the rational distribution of second lens and fifth lens focal power, reducing the aberration, improving final imaging. Preferably, 6.6 < f2/f5 < 6.9.

In the present embodiment, half of the Semi-FOV of the maximum field angle of the imaging lens satisfies: the Semi-FOV is more than or equal to 40.0 degrees. By restricting half of the Semi-FOV of the maximum field angle of the imaging lens to a range of 40.0 ° or more, the obtained object information can be enlarged. Preferably, the Semi-FOV is > 43.0 °.

Example two

As shown in fig. 1 to 30, the image capturing lens includes, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, where the first lens has a power; the second lens has negative focal power; the third lens has negative focal power; the fourth lens has focal power; the fifth lens has focal power; the sixth lens has focal power; the seventh lens has focal power; wherein the first lens is made of glass; the surface of the sixth lens facing the object side is a convex surface, and the surface facing the image side is a concave surface; the surface of the seventh lens facing the object side is a concave surface; 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 1.3; half of the Semi-FOV of the maximum field angle of the camera lens satisfies: the Semi-FOV is more than or equal to 40.0 degrees.

Preferably, the Semi-FOV is > 43.0 °.

By controlling the focal power, the surface type and the material of each lens, the image resolution can be improved, and the camera lens can still maintain perfect image resolution within a larger temperature variation range. 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 miniaturization is met, and meanwhile, the appearance attractiveness of the camera lens can be improved. By restricting half of the Semi-FOV of the maximum field angle of the imaging lens to a range of 40.0 ° or more, the obtained object information can be enlarged. In addition, the camera lens is a seven-piece ultrathin glass-plastic mixed camera lens with high pixels, a large image plane and a large aperture, and can better meet the use requirements of various special scenes.

In the present embodiment, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5. By restricting the ratio of the effective focal length f3 of the third lens to the effective focal length f6 of the sixth lens within a reasonable range, the reasonable distribution of the focal power of the third lens and the focal power of the sixth lens can be ensured, which is beneficial to reducing aberration and improving imaging quality. Preferably, -8.4 < f3/f6 < -7.9.

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 < 1.7. The characteristic of a large aperture of a system can be realized by restricting the ratio of the effective focal length f of the camera lens to the entrance pupil diameter EPD of the camera lens within a reasonable range, so that the camera can have better image quality in a dark environment and realize the function of night shooting.

In this embodiment, a radius of curvature R3 of the surface of the second lens facing the object side and a radius of curvature R4 of the surface of the second lens facing the image side satisfy: 8.0 < (R3+ R4)/(R3-R4) < 9.0. Satisfying the conditional expression, the curvature and focal power of the second lens can be ensured, the molding processability of the second lens can be improved, and the aberration can be reduced. Preferably 8.3 < (R3+ R4)/(R3-R4) < 8.9.

In this embodiment, a radius of curvature R8 of a surface of the fourth lens facing the image side and a radius of curvature R11 of a surface of the sixth lens facing the object side satisfy: -10.0 < R8/R11 < -9.0. The curvature of the fourth lens and the curvature of the sixth lens can be guaranteed, the processability of the fourth lens and the sixth lens can be guaranteed, off-axis aberration can be reduced, and imaging quality is improved. Preferably, -10.0 < R8/R11 < -9.4.

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 seven lenses described above. The optical power and the surface shape of each lens, the center thickness of each lens, the on-axis distance between lenses and the like are reasonably distributed, so that the sensitivity of the camera lens can be effectively reduced, the machinability of the camera lens can be improved, the camera lens is more favorable for production and processing, and the camera lens 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 is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the 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 seven lenses are exemplified in the embodiment, the imaging lens is not limited to including seven lenses. The camera lens may also include other numbers of lenses, as desired.

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

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

Example one

As shown in fig. 1 to 5, an imaging lens of the first example of the present application is described. Fig. 1 shows a schematic diagram of an imaging lens structure of example one.

As shown in fig. 1, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a seventh mirror E7, a filter E8, and an image plane S17.

The first lens E1 has positive power, and its object-side surface S1 is convex and its image-side surface S2 is concave. The second lens E2 has negative power, the object-facing surface S3 of the second lens is a convex surface, and the image-facing surface S4 of the second lens is a concave surface. The third lens E3 has negative 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 concave surface. The fourth lens E4 has positive power, and its object-side surface S7 is a convex surface, and its image-side surface S8 is a convex surface. The fifth lens E5 has negative power, and its object-side surface S9 is convex and its image-side surface S10 is concave. The sixth lens E6 has positive power, and its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens E7 has negative power, and the object-side surface S13 of the seventh lens is a concave surface, and the image-side surface S14 of the seventh lens is a concave surface. The filter E8 has a surface S15 facing the object side of the filter and a surface S16 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the camera lens is 6.89mm, the half Semi-FOV of the maximum field angle of the camera lens is 43.7 °, the total length TTL of the camera lens is 8.49mm and the image height ImgH is 6.71 mm.

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

TABLE 1

In example one, the object-side surface and the image-side surface of any one of the first lens E1 to the seventh lens E7 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 A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S14 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.4627E-02

-1.2451E-02

-4.7469E-03

-1.4344E-03

-3.8687E-04

-8.2311E-05

-5.8374E-05

S2

-9.4602E-02

1.3827E-02

-3.0669E-03

3.5439E-04

-1.9258E-04

-2.7130E-04

-1.2410E-04

S3

-4.2235E-02

4.1918E-02

1.4293E-03

2.3381E-03

6.4426E-07

-3.7387E-04

-2.0698E-04

S4

3.0897E-02

1.9594E-02

2.3164E-03

2.1532E-03

8.2548E-04

2.7115E-04

1.2360E-04

S5

-2.3437E-01

-1.1073E-02

1.6089E-03

2.4385E-03

8.0428E-04

3.0334E-04

4.2732E-05

S6

-2.6713E-01

8.7532E-03

8.2226E-03

4.0143E-03

2.7052E-04

-1.6428E-04

-1.5626E-04

S7

-1.8068E-01

2.0311E-02

6.7498E-03

2.9469E-03

1.2940E-04

-1.2994E-04

-1.3694E-04

S8

-3.5541E-01

1.3812E-02

1.1113E-02

8.1436E-03

3.8727E-03

1.9567E-03

3.9297E-04

S9

-1.0813E+00

4.0189E-02

2.8185E-02

4.2837E-02

6.6926E-05

7.4948E-04

-4.0019E-03

S10

-3.5665E+00

5.5053E-01

-1.9759E-01

3.0222E-02

-5.1006E-02

7.4027E-03

-5.1726E-03

S11

-4.2155E+00

5.0920E-01

5.2606E-02

1.4676E-02

-2.9349E-02

1.2902E-02

-1.9661E-03

S12

-6.8823E-01

-5.3622E-01

2.5918E-01

-1.0552E-01

5.8536E-02

-1.9098E-02

1.1389E-02

S13

3.3664E+00

-2.8913E-01

1.7642E-02

3.1968E-02

-5.4501E-02

2.4906E-02

8.1383E-03

S14

-2.7437E+00

4.7802E-01

-1.5472E-02

-1.4868E-02

-1.2901E-02

-1.3822E-02

5.1753E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-4.1451E-05

-4.3007E-05

-1.9739E-05

-1.8246E-05

-1.4780E-05

-1.5208E-05

-2.5994E-06

S2

-5.5273E-05

-1.2541E-05

0.0000E+00

S3

-1.1989E-04

-5.4443E-05

-1.9908E-05

-1.5056E-05

-9.8985E-06

-8.0025E-06

-1.0397E-06

S4

4.0125E-05

1.4392E-05

2.1569E-06

-6.7370E-07

-3.3244E-06

-1.4411E-06

-1.9736E-06

S5

3.3548E-05

-1.0348E-05

1.0675E-05

-4.4693E-06

6.7640E-06

-4.1330E-06

7.3933E-07

S6

-1.1769E-05

-1.9760E-05

1.5026E-06

-3.8818E-06

4.4460E-06

2.1732E-06

-1.9821E-06

S7

1.2046E-05

-2.4799E-05

-5.6302E-06

-3.8701E-06

4.8273E-06

2.1803E-06

1.0041E-06

S8

3.6740E-05

-1.0061E-04

-8.9807E-05

-6.4412E-05

-4.3203E-05

-1.5074E-05

-1.1403E-05

S9

-1.3034E-03

-5.6873E-04

5.8498E-04

6.0765E-04

4.1590E-04

1.4638E-04

5.8158E-05

S10

-7.0234E-04

-2.6120E-03

-2.4864E-04

-3.3925E-04

-1.3400E-04

-1.6635E-04

4.7880E-06

S11

-2.5846E-03

-1.7842E-03

1.7642E-03

1.7440E-04

-1.8240E-04

-1.3996E-04

-6.0510E-05

S12

-2.5300E-03

1.0626E-03

-1.2314E-03

-4.7144E-04

3.4133E-04

-3.0670E-04

3.8811E-05

S13

-1.9592E-02

1.2750E-02

-4.0444E-03

-2.4741E-04

7.0395E-04

-2.1174E-04

-1.0523E-05

S14

-1.1121E-03

6.1649E-03

-5.1509E-03

-1.6256E-04

6.6483E-04

1.8630E-04

-1.9435E-04

TABLE 2

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

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

Example two

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

As shown in fig. 6, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a seventh mirror E7, a filter E8, and an image plane S17.

The first lens E1 has positive power, and its object-side surface S1 is convex and its image-side surface S2 is concave. The second lens E2 has negative power, the object-facing surface S3 of the second lens is a convex surface, and the image-facing surface S4 of the second lens is a concave surface. The third lens E3 has negative power, and its object-side surface S5 is convex and its image-side surface S6 is concave. The fourth lens E4 has positive power, and its object-side surface S7 is a convex surface, and its image-side surface S8 is a convex surface. The fifth lens E5 has negative power, and its object-side surface S9 is convex and its image-side surface S10 is concave. The sixth lens E6 has positive power, and its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens E7 has negative power, and its object-side surface S13 is concave, and its image-side surface S14 is concave. The filter E8 has a surface S15 facing the object side of the filter and a surface S16 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the camera lens is 6.74mm, the half Semi-FOV of the maximum field angle of the camera lens is 43.7 °, the total length TTL of the camera lens is 8.37mm and the image height ImgH is 6.50 mm.

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

TABLE 3

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.2474E-02

-1.0740E-02

-3.7871E-03

-1.0715E-03

-2.4105E-04

0.0000E+00

S2

-9.1932E-02

1.3150E-02

-2.6888E-03

5.8422E-04

-3.7714E-05

-1.3878E-04

-3.4018E-05

S3

-4.8478E-02

3.5825E-02

5.9368E-04

1.9871E-03

1.8788E-04

-1.2403E-04

-3.0664E-05

S4

2.6904E-02

1.7572E-02

1.3661E-03

1.4626E-03

4.4845E-04

1.0737E-04

4.8666E-05

S5

-2.2837E-01

-1.1828E-02

8.8478E-04

1.5122E-03

4.8132E-04

8.6143E-05

0.0000E+00

S6

-2.6159E-01

7.9721E-03

7.4076E-03

3.0591E-03

5.0019E-05

-2.6104E-04

-1.6811E-04

S7

-1.8149E-01

2.0548E-02

6.7772E-03

2.6428E-03

1.0029E-04

-9.8723E-05

-1.2286E-04

S8

-3.4862E-01

1.0743E-02

8.5513E-03

7.3692E-03

3.6627E-03

2.0650E-03

5.4008E-04

S9

-9.6214E-01

1.3061E-02

2.5465E-03

2.9520E-02

1.0030E-03

4.0384E-03

-8.5188E-04

S10

-3.2251E+00

5.2033E-01

-1.4869E-01

4.5164E-02

-3.6356E-02

7.8136E-03

-2.1856E-03

S11

-4.1989E+00

5.1147E-01

5.1663E-02

1.5039E-02

-3.0079E-02

1.2722E-02

-2.3564E-03

S12

-6.9759E-01

-5.8202E-01

2.6265E-01

-1.0644E-01

5.9149E-02

-1.8468E-02

1.1943E-02

S13

3.2123E+00

-2.6434E-01

1.4868E-02

3.7052E-02

-5.3239E-02

2.0616E-02

1.1664E-02

S14

-2.6984E+00

4.3751E-01

-4.0522E-03

-1.0510E-02

-1.0525E-02

-1.4101E-02

4.7363E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

-2.2191E-05

6.2603E-06

0.0000E+00

S3

-3.3140E-05

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

5.3749E-05

0.0000E+00

S8

2.1350E-04

3.3824E-05

1.0637E-05

0.0000E+00

S9

-1.1114E-04

-7.1570E-04

-1.8253E-04

-1.1598E-04

1.4609E-06

-4.3528E-05

0.0000E+00

S10

1.3347E-03

-1.0705E-03

2.4461E-04

-4.5171E-05

6.8696E-05

-1.1467E-04

0.0000E+00

S11

-2.4566E-03

-1.3200E-03

2.1674E-03

2.2925E-04

-1.6366E-04

-1.6190E-04

0.0000E+00

S12

-2.8538E-03

9.3898E-04

-1.3900E-03

-3.6379E-04

4.9807E-04

-1.4098E-04

1.4503E-04

S13

-1.9298E-02

1.1334E-02

-2.5501E-03

-6.5126E-04

2.1645E-04

0.0000E+00

S14

-2.4081E-03

6.9613E-03

-4.5631E-03

2.0826E-04

5.5902E-04

1.7969E-04

-3.6629E-04

TABLE 4

Fig. 7 shows an axial chromatic aberration curve of the imaging lens of example two, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 8 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example two. Fig. 9 shows distortion curves of the imaging lens of example two, which show values of distortion magnitudes corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the imaging lens of the second example, which shows the deviation of different image heights on the image forming surface after the light passes through the imaging lens.

As can be seen from fig. 7 to 10, the imaging lens according to example two can achieve good imaging quality.

Example III

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

As shown in fig. 11, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a seventh mirror E7, a filter E8, and an image plane S17.

In this example, the total effective focal length f of the imaging lens is 6.74mm, the Semi-FOV, which is the half of the maximum field angle of the imaging lens, is 43.7 °, the total length TTL of the imaging lens is 8.36mm, and the image height ImgH is 6.50 mm.

Table 5 shows a basic configuration parameter table of the imaging lens of example three, in which the unit of the radius of curvature and the thickness/distance 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

-4.2427E-02

-1.0753E-02

-3.7546E-03

-1.0430E-03

-2.1783E-04

0.0000E+00

S2

-9.1965E-02

1.3162E-02

-2.6993E-03

6.0122E-04

-3.7731E-05

-1.3520E-04

-4.1398E-05

S3

-4.8450E-02

3.5811E-02

5.9472E-04

1.9733E-03

1.8771E-04

-1.2011E-04

-2.1663E-05

S4

2.6891E-02

1.7591E-02

1.3653E-03

1.4611E-03

4.4054E-04

1.0231E-04

4.3816E-05

S5

-2.2836E-01

-1.1846E-02

8.9197E-04

1.5169E-03

4.8933E-04

8.6039E-05

0.0000E+00

S6

-2.6158E-01

7.9892E-03

7.4039E-03

3.0659E-03

5.1457E-05

-2.5840E-04

-1.6625E-04

S7

-1.8149E-01

2.0528E-02

6.7831E-03

2.6366E-03

1.0566E-04

-8.7691E-05

-1.1019E-04

S8

-3.4869E-01

1.0789E-02

8.5478E-03

7.3748E-03

3.6557E-03

2.0602E-03

5.3177E-04

S9

-9.6196E-01

1.2893E-02

2.5648E-03

2.9533E-02

1.0179E-03

4.0343E-03

-8.5366E-04

S10

-3.2251E+00

5.2037E-01

-1.4870E-01

4.5159E-02

-3.6358E-02

7.8157E-03

-2.1834E-03

S11

-4.1989E+00

5.1146E-01

5.1669E-02

1.5041E-02

-3.0079E-02

1.2722E-02

-2.3561E-03

S12

-6.9749E-01

-5.8200E-01

2.6264E-01

-1.0645E-01

5.9142E-02

-1.8468E-02

1.1944E-02

S13

3.2122E+00

-2.6434E-01

1.4863E-02

3.7051E-02

-5.3239E-02

2.0617E-02

1.1666E-02

S14

-2.6983E+00

4.3694E-01

-3.9732E-03

-1.0502E-02

-1.0525E-02

-1.4100E-02

4.7351E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

-2.8360E-05

-4.4927E-06

0.0000E+00

S3

-2.7746E-05

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

5.9364E-05

0.0000E+00

S8

2.0793E-04

2.8382E-05

8.4657E-06

0.0000E+00

S9

-1.1286E-04

-7.1515E-04

-1.8094E-04

-1.1809E-04

-1.6472E-06

-4.2115E-05

0.0000E+00

S10

1.3343E-03

-1.0680E-03

2.5137E-04

-4.6093E-05

7.1673E-05

-1.1270E-04

0.0000E+00

S11

-2.4573E-03

-1.3199E-03

2.1665E-03

2.2877E-04

-1.6397E-04

-1.6199E-04

0.0000E+00

S12

-2.8452E-03

9.2062E-04

-1.3739E-03

-3.6411E-04

5.0035E-04

-1.4217E-04

1.4822E-04

S13

-1.9298E-02

1.1333E-02

-2.5527E-03

-6.5162E-04

2.1752E-04

0.0000E+00

S14

-2.4095E-03

6.9604E-03

-4.5646E-03

2.1011E-04

5.6071E-04

1.7706E-04

-3.6768E-04

TABLE 6

Fig. 12 shows an axial chromatic aberration curve of the imaging lens of example three, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 13 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example three. Fig. 14 shows distortion curves of the imaging lens of example three, which show distortion magnitude values corresponding to different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the imaging lens of example three, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging lens.

As can be seen from fig. 12 to 15, the imaging lens according to the third example can achieve good imaging quality.

Example four

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

As shown in fig. 16, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a seventh mirror E7, a filter E8, and an image plane S17.

The first lens E1 has positive power, and its object-side surface S1 is convex and its image-side surface S2 is concave. The second lens E2 has negative power, the object-facing surface S3 of the second lens is a convex surface, and the image-facing surface S4 of the second lens is a concave surface. The third lens E3 has negative 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 concave surface. The fourth lens E4 has positive power, and its object-side surface S7 is a convex surface, and its image-side surface S8 is a convex surface. The fifth lens E5 has negative power, and its object-side surface S9 is convex and its image-side surface S10 is concave. The sixth lens E6 has positive power, and its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens E7 has negative power, and its object-side surface S13 is concave, and its image-side surface S14 is concave. The filter E8 has a surface S15 facing the object side of the filter and a surface S16 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the camera lens is 6.83mm, the half Semi-FOV of the maximum field angle of the camera lens is 44.0 °, the total length TTL of the camera lens is 8.35mm and the image height ImgH is 6.71 mm.

Table 7 shows a basic configuration parameter table of the imaging lens of example four, in which the units of the radius of curvature and the thickness/distance are 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

S1

-5.0841E-02

-1.5847E-02

-6.1052E-03

-2.1596E-03

-6.7185E-04

-3.2312E-04

-2.0295E-04

S2

-1.0498E-01

1.4307E-02

-5.0837E-03

-5.9285E-04

-1.1268E-03

-7.9752E-04

-3.4256E-04

S3

-3.8786E-02

4.5246E-02

1.8826E-03

2.2241E-03

-3.3916E-04

-6.7238E-04

-3.5373E-04

S4

3.7419E-02

2.3236E-02

3.7855E-03

3.0597E-03

1.1954E-03

4.3001E-04

1.8134E-04

S5

-2.5472E-01

-1.0415E-02

3.7095E-03

3.7307E-03

1.3330E-03

4.8791E-04

1.0011E-04

S6

-2.7762E-01

1.1863E-02

1.0056E-02

4.5409E-03

1.4481E-04

-2.8659E-04

-2.2968E-04

S7

-1.8463E-01

2.2736E-02

7.7485E-03

3.0844E-03

5.7084E-05

-2.1745E-04

-1.6381E-04

S8

-3.5493E-01

1.3866E-02

1.0797E-02

7.9295E-03

3.8655E-03

1.8823E-03

3.4763E-04

S9

-9.9510E-01

1.4885E-02

7.6725E-03

3.4198E-02

1.1961E-03

3.1321E-03

-1.8504E-03

S10

-3.2494E+00

5.2501E-01

-1.5351E-01

4.5210E-02

-3.7593E-02

8.0905E-03

-2.0625E-03

S11

-4.1524E+00

4.8898E-01

5.0932E-02

1.6619E-02

-2.8543E-02

1.2558E-02

-1.4447E-03

S12

-7.2788E-01

-5.3927E-01

2.6850E-01

-1.0621E-01

6.1057E-02

-1.9307E-02

1.1900E-02

S13

3.3087E+00

-2.8138E-01

1.6982E-02

3.3862E-02

-5.4165E-02

2.3529E-02

9.3132E-03

S14

-2.7480E+00

4.7564E-01

-1.5773E-02

-1.5666E-02

-1.3416E-02

-1.3799E-02

5.2896E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.8141E-04

-1.1388E-04

-8.4445E-05

-3.9543E-05

-3.3593E-05

-1.1160E-05

-6.2110E-06

S2

-1.1176E-04

-1.4901E-05

0.0000E+00

S3

-2.1635E-04

-8.6775E-05

-5.3022E-05

-2.5750E-05

-1.8251E-05

3.3071E-07

5.3734E-07

S4

5.1838E-05

9.5855E-06

-8.6409E-06

-1.1989E-05

-1.0478E-05

-5.9619E-06

-3.6506E-06

S5

5.5881E-05

-1.2910E-06

1.5491E-05

-3.3414E-06

6.2429E-06

-5.4508E-06

1.5146E-06

S6

-1.0531E-05

-2.7472E-05

4.1690E-06

-7.3460E-06

7.9615E-06

2.3903E-07

6.3934E-07

S7

1.2095E-05

-2.7487E-05

-6.5636E-06

-6.6856E-07

7.0800E-06

3.1677E-06

1.4517E-07

S8

3.4023E-06

-1.1503E-04

-9.2076E-05

-6.9500E-05

-3.3697E-05

-1.2703E-05

4.3615E-06

S9

-5.9972E-04

-8.2502E-04

-1.1937E-04

5.1246E-05

7.9960E-05

5.3949E-05

1.6368E-05

S10

1.3201E-03

-1.2084E-03

1.2291E-04

0.0000E+00

S11

-2.3655E-03

-1.8765E-03

1.5988E-03

2.4763E-04

-1.2310E-04

-4.0976E-05

-9.3519E-05

S12

-3.0462E-03

5.8962E-04

-1.4783E-03

-5.8083E-04

3.2829E-04

-4.5775E-04

4.5426E-05

S13

-1.9492E-02

1.2253E-02

-3.6848E-03

-3.3751E-04

6.8239E-04

-1.7348E-04

-1.3160E-05

S14

-1.1401E-03

6.0222E-03

-5.2709E-03

-5.1137E-05

7.2225E-04

1.5531E-04

-1.9282E-04

TABLE 8

Fig. 17 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. 18 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example four. Fig. 19 shows distortion curves of the imaging lens of example four, which show values of distortion magnitudes corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the imaging lens of example four, which represents a deviation of different image heights on the imaging surface after light passes through the imaging lens.

As can be seen from fig. 17 to 20, the imaging lens according to example four can achieve good imaging quality.

Example five

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

As shown in fig. 21, the image capturing lens system includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

In this example, the total effective focal length f of the camera lens is 6.89mm, the half Semi-FOV of the maximum field angle of the camera lens is 43.4 °, the total length TTL of the camera lens is 8.49mm and the image height ImgH is 6.71 mm.

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

TABLE 9

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.4415E-02

-1.2443E-02

-4.7449E-03

-1.5104E-03

-4.8107E-04

-1.7587E-04

-1.2672E-04

S2

-9.4687E-02

1.3847E-02

-3.1586E-03

1.3500E-04

-3.7024E-04

-3.0446E-04

-1.2398E-04

S3

-4.2580E-02

4.1962E-02

1.3647E-03

1.9623E-03

-2.6045E-04

-4.3257E-04

-2.1935E-04

S4

3.0746E-02

1.9680E-02

2.4909E-03

2.1189E-03

7.5341E-04

2.3944E-04

1.0122E-04

S5

-2.3520E-01

-1.1260E-02

1.5573E-03

2.3668E-03

7.6211E-04

2.7340E-04

2.7921E-05

S6

-2.6677E-01

8.7756E-03

8.1709E-03

3.7468E-03

2.3837E-04

-1.9961E-04

-1.7570E-04

S7

-1.8086E-01

2.0255E-02

6.6303E-03

2.7514E-03

2.1579E-04

-1.0473E-04

-1.5935E-04

S8

-3.5596E-01

1.3633E-02

1.1136E-02

8.0978E-03

3.9718E-03

1.9896E-03

3.5940E-04

S9

-1.0816E+00

4.0230E-02

2.8606E-02

4.2094E-02

2.0632E-04

8.1421E-04

-4.0019E-03

S10

-3.5657E+00

5.5049E-01

-1.9716E-01

2.9533E-02

-5.0979E-02

7.2764E-03

-5.2133E-03

S11

-4.2166E+00

5.0891E-01

5.2103E-02

1.5543E-02

-2.9526E-02

1.3270E-02

-2.1352E-03

S12

-6.8193E-01

-5.3554E-01

2.5966E-01

-1.0652E-01

5.8443E-02

-1.9063E-02

1.1320E-02

S13

3.3665E+00

-2.8996E-01

1.7465E-02

3.1828E-02

-5.4515E-02

2.4921E-02

8.5133E-03

S14

-2.7408E+00

4.7350E-01

-1.5098E-02

-1.4671E-02

-1.2713E-02

-1.3771E-02

5.0319E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-8.6670E-05

-7.0344E-05

-4.0488E-05

-3.2409E-05

-1.9652E-05

-1.3539E-05

1.6246E-07

S2

-3.8855E-05

-8.2959E-06

0.0000E+00

S3

-1.0206E-04

-4.2469E-05

-1.0670E-05

-6.4770E-06

-4.0871E-07

5.3236E-07

3.4181E-06

S4

2.7064E-05

7.4391E-06

-1.1867E-06

-1.1550E-06

-3.2234E-06

-8.1608E-07

-1.4743E-06

S5

3.8022E-05

-1.0566E-05

1.2913E-05

-6.2368E-06

6.2308E-06

-5.0824E-06

1.6288E-06

S6

9.9191E-06

-2.9828E-05

2.8691E-06

-8.8521E-06

6.3219E-06

-9.8261E-07

-1.3066E-06

S7

4.5597E-05

-4.4860E-05

-3.0659E-06

-8.1896E-06

9.9212E-06

-1.3769E-06

1.8186E-06

S8

1.8355E-05

-1.3185E-04

-1.1546E-04

-8.3529E-05

-4.7543E-05

-1.4937E-05

-9.4998E-06

S9

-1.2415E-03

-5.2872E-04

5.7358E-04

5.7362E-04

3.9236E-04

1.4285E-04

6.8798E-05

S10

-4.5916E-04

-2.5638E-03

-3.8518E-04

-4.2465E-04

-2.2824E-04

-1.7707E-04

1.2227E-05

S11

-2.3022E-03

-1.5083E-03

2.0647E-03

4.7236E-04

-3.0957E-04

-2.0712E-04

-5.6061E-05

S12

-2.5881E-03

8.6894E-04

-1.1086E-03

-1.9892E-04

3.6196E-04

-1.7262E-04

-3.7182E-05

S13

-1.9667E-02

1.2933E-02

-3.9336E-03

-4.8353E-04

6.2088E-04

5.0164E-05

-1.5924E-04

S14

-1.4528E-03

6.1932E-03

-5.0293E-03

4.4706E-04

7.4757E-04

5.5998E-05

-2.6552E-04

Watch 10

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

Example six

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

As shown in fig. 26, the imaging lens includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a seventh mirror E7, a filter E8, and an image plane S17.

In this example, the total effective focal length f of the camera lens is 6.90mm, the half Semi-FOV of the maximum field angle of the camera lens is 43.4 °, the total length TTL of the camera lens is 8.50mm and the image height ImgH is 6.71 mm.

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.4455E-02

-1.2400E-02

-4.8037E-03

-1.5040E-03

-4.7117E-04

-1.3513E-04

-8.6888E-05

S2

-9.4630E-02

1.3846E-02

-3.2473E-03

1.5990E-04

-3.2640E-04

-2.5622E-04

-8.0828E-05

S3

-4.2419E-02

4.2046E-02

1.4892E-03

2.1203E-03

-1.3134E-04

-3.4208E-04

-1.5994E-04

S4

3.0734E-02

1.9727E-02

2.5976E-03

2.1935E-03

8.0921E-04

2.7485E-04

1.2697E-04

S5

-2.3510E-01

-1.1256E-02

1.6030E-03

2.4227E-03

7.9734E-04

2.9479E-04

4.1372E-05

S6

-2.6695E-01

8.7337E-03

8.1383E-03

3.7751E-03

2.5625E-04

-1.8215E-04

-1.6366E-04

S7

-1.8079E-01

2.0308E-02

6.6437E-03

2.7482E-03

2.0912E-04

-1.0922E-04

-1.5747E-04

S8

-3.5611E-01

1.3449E-02

1.1190E-02

8.1198E-03

3.9431E-03

1.9826E-03

3.5809E-04

S9

-1.0815E+00

4.0202E-02

2.8530E-02

4.2278E-02

2.1484E-04

7.8130E-04

-4.0304E-03

S10

-3.5662E+00

5.5050E-01

-1.9733E-01

2.9638E-02

-5.0882E-02

7.2967E-03

-5.1971E-03

S11

-4.2176E+00

5.0853E-01

5.2225E-02

1.5304E-02

-2.9464E-02

1.3287E-02

-2.0501E-03

S12

-6.8414E-01

-5.3470E-01

2.5944E-01

-1.0623E-01

5.8446E-02

-1.9035E-02

1.1331E-02

S13

3.3672E+00

-2.9002E-01

1.7480E-02

3.1859E-02

-5.4501E-02

2.4920E-02

8.4759E-03

S14

-2.7419E+00

4.7380E-01

-1.5061E-02

-1.4775E-02

-1.2739E-02

-1.3790E-02

5.0433E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-4.2948E-05

-3.7061E-05

-1.0005E-05

-7.8121E-06

4.5250E-06

4.9811E-06

9.7102E-06

S2

-1.6414E-05

6.5281E-07

0.0000E+00

S3

-7.8808E-05

-3.7452E-05

-1.8167E-05

-1.4281E-05

-7.1745E-06

-4.1127E-06

9.6716E-07

S4

4.0726E-05

1.6768E-05

3.7867E-06

3.2381E-06

-5.2693E-08

1.7402E-06

-9.6764E-07

S5

4.5637E-05

-5.3456E-06

1.6833E-05

-5.0409E-06

5.6452E-06

-5.6663E-06

2.3683E-06

S6

1.8803E-05

-2.6334E-05

6.8086E-06

-7.6118E-06

6.2172E-06

-2.4168E-06

-1.1941E-06

S7

5.2118E-05

-4.1028E-05

2.7625E-06

-5.2234E-06

1.1473E-05

-4.3503E-07

3.1590E-06

S8

3.5641E-05

-1.1622E-04

-9.9244E-05

-7.3260E-05

-4.0347E-05

-1.3493E-05

-8.7411E-06

S9

-1.2512E-03

-5.1953E-04

5.7038E-04

5.6649E-04

3.8950E-04

1.4895E-04

7.4223E-05

S10

-4.9173E-04

-2.5389E-03

-3.7497E-04

-3.8684E-04

-1.8930E-04

-1.3618E-04

3.0321E-05

S11

-2.3559E-03

-1.5386E-03

2.0013E-03

4.3184E-04

-3.6190E-04

-2.3571E-04

-6.5466E-05

S12

-2.5631E-03

8.8735E-04

-1.1017E-03

-2.1902E-04

3.5230E-04

-1.7137E-04

-2.9205E-05

S13

-1.9679E-02

1.2922E-02

-3.9515E-03

-4.3738E-04

6.1198E-04

1.6522E-05

-1.3211E-04

S14

-1.4472E-03

6.2595E-03

-5.0432E-03

3.7510E-04

7.4037E-04

4.9725E-05

-2.5474E-04

TABLE 12

Fig. 27 shows an on-axis chromatic aberration curve of the imaging lens of example six, which shows the deviation of the convergent focal points of light rays of different wavelengths after passing through the imaging lens. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example six. Fig. 29 shows distortion curves of the imaging lens of example six, which show distortion magnitude values corresponding to different angles of view. Fig. 30 shows a chromatic aberration of magnification curve of the imaging lens of example six, which represents a deviation of different image heights on the imaging surface after light passes through the imaging lens.

As can be seen from fig. 27 to 30, the imaging lens according to example six can achieve good image quality.

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

Conditional formula/example	1	2	3	4	5	6
							f/EPD	1.62	1.60	1.70	1.60	1.64	1.67
f2/f	-7.46	-7.74	-7.74	-7.71	-7.59	-7.52
							f3/f6	-8.22	-8.02	-8.02	-8.33	-7.96	-8.00
f4/f6	5.22	4.94	4.94	5.21	5.10	5.12
							(R3+R4)/(R3-R4)	8.37	8.86	8.86	8.69	8.57	8.49
R5/R10	7.99	7.65	7.64	7.88	8.06	8.03
							R7/R10	7.97	7.39	7.39	7.83	7.78	7.79
R8/R11	-9.82	-9.45	-9.45	-9.92	-9.61	-9.65
							R9/R11	6.17	6.50	6.50	6.28	6.25	6.23
R14/R13	-5.58	-4.87	-4.86	-5.49	-5.32	-5.34
							f2/f5	6.64	6.86	6.87	6.84	6.78	6.71
Semi-FOV	43.7	43.7	43.7	44.0	43.4	43.4
							TTL/ImgH	1.26	1.29	1.29	1.24	1.27	1.27

Table 13 table 14 gives effective focal lengths f of the imaging lenses of example one to example six, effective focal lengths f1 to f7 of the respective lenses, and the like.

Parameters/examples	1	2	3	4	5	6
							f(mm)	6.89	6.74	6.74	6.83	6.89	6.90
f1(mm)	8.24	8.22	8.22	8.24	8.24	8.24
							f2(mm)	-51.46	-52.20	-52.20	-52.61	-52.31	-51.86
f3(mm)	-32.57	-31.76	-31.76	-33.01	-31.54	-31.71
							f4(mm)	20.68	19.58	19.57	20.63	20.22	20.28
f5(mm)	-7.75	-7.60	-7.60	-7.69	-7.72	-7.73
							f6(mm)	3.96	3.96	3.96	3.96	3.96	3.96
f7(mm)	-4.86	-4.85	-4.85	-4.86	-4.85	-4.85
							TTL(mm)	8.49	8.37	8.36	8.35	8.49	8.50
ImgH(mm)	6.71	6.50	6.50	6.71	6.71	6.71
							Semi-FOV(°)	43.7	43.7	43.7	44.0	43.4	43.4

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 drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

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

Claims

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

a first lens having an optical power;

a second lens having a negative optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens having an optical power;

a sixth lens having an optical power;

a seventh lens having an optical power;

wherein the material of the first lens is glass; the surface of the sixth lens, which faces the object side, is a convex surface, and the surface of the sixth lens, which faces the image side, is a concave surface; the surface of the seventh lens, which faces the object side, is a concave surface; the effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following requirements: f/EPD is less than 1.7; the distance TTL on the axis 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 conditions: TTL/ImgH is less than 1.3.

2. An imaging lens according to claim 1, wherein an effective focal length f2 of the second lens satisfies: -8.0 < f2/f < -7.0.

3. The imaging lens according to claim 1, wherein an effective focal length f3 of the third lens element and an effective focal length f6 of the sixth lens element satisfy: -8.5 < f3/f6 < -7.5.

4. The imaging lens according to claim 1, wherein an effective focal length f4 of the fourth lens element and an effective focal length f6 of the sixth lens element satisfy: 4.5 < f4/f6 < 5.5.

5. 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 R4 of a surface of the second lens facing the image side satisfy: 8.0 < (R3+ R4)/(R3-R4) < 9.0.

6. 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 a radius of curvature R10 of a surface of the fifth lens facing the image side satisfy: 7.5 < R5/R10 < 8.5.

7. The imaging lens of claim 1, wherein a radius of curvature R8 of a surface of the fourth lens facing the image side and a radius of curvature R11 of a surface of the sixth lens facing the object side satisfy: -10.0 < R8/R11 < -9.0.

8. The imaging lens according to claim 1, wherein a radius of curvature R9 of a surface of the fifth lens facing the object side and a radius of curvature R11 of a surface of the sixth lens facing the object side satisfy: 6.0 < R9/R11 < 7.0.

9. The imaging lens according to claim 1, wherein a radius of curvature R13 of a surface of the seventh lens facing the object side and a radius of curvature R14 of a surface of the seventh lens facing the image side satisfy: -6.0 < R14/R13 < -4.5.

10. The imaging lens according to claim 1, wherein an effective focal length f2 of the second lens and an effective focal length f5 of the fifth lens satisfy: f2/f5 is more than 6.0 and less than 7.0.

11. The imaging lens of claim 1, wherein a half Semi-FOV of a maximum field angle of the imaging lens satisfies: the Semi-FOV is more than or equal to 40.0 degrees.

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

a first lens having an optical power;

a second lens having a negative optical power;

a third lens having a negative optical power;

a fourth lens having optical power;

a fifth lens having an optical power;

a sixth lens having an optical power;

a seventh lens having an optical power;

wherein the material of the first lens is glass; the surface of the sixth lens, which faces the object side, is a convex surface, and the surface of the sixth lens, which faces the image side, is a concave surface; the surface of the seventh lens, which faces the object side, is a concave surface; the on-axis distance TTL from the surface of the first lens facing the object side to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy the following condition: TTL/ImgH is less than 1.3; half of the Semi-FOV of the maximum field angle of the camera lens meets the following conditions: the Semi-FOV is more than or equal to 40.0 degrees.

13. An imaging lens according to claim 12, wherein an effective focal length f2 of the second lens satisfies: -8.0 < f2/f < -7.0.

14. The imaging lens of claim 12, wherein an effective focal length f3 of the third lens element and an effective focal length f6 of the sixth lens element satisfy: -8.5 < f3/f6 < -7.5.

15. 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 is less than 1.7; the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5.

16. The imaging lens of claim 12, wherein a radius of curvature R3 of a surface of the second lens facing the object side and a radius of curvature R4 of a surface of the second lens facing the image side satisfy: 8.0 < (R3+ R4)/(R3-R4) < 9.0.

17. The imaging lens of claim 12, wherein a radius of curvature R5 of a surface of the third lens facing the object side and a radius of curvature R10 of a surface of the fifth lens facing the image side satisfy: 7.5 < R5/R10 < 8.5.

18. The imaging lens of claim 12, wherein a radius of curvature R8 of a surface of the fourth lens facing the image side and a radius of curvature R11 of a surface of the sixth lens facing the object side satisfy: -10.0 < R8/R11 < -9.0.

19. The imaging lens according to claim 12, wherein a radius of curvature R9 of a surface of the fifth lens facing the object side and a radius of curvature R11 of a surface of the sixth lens facing the object side satisfy: 6.0 < R9/R11 < 7.0.

20. The imaging lens according to claim 12, wherein a radius of curvature R13 of a surface of the seventh lens facing the object side and a radius of curvature R14 of a surface of the seventh lens facing the image side satisfy: -6.0 < R14/R13 < -4.5.

21. The imaging lens according to claim 12, wherein an effective focal length f2 of the second lens and an effective focal length f5 of the fifth lens satisfy: f2/f5 is more than 6.0 and less than 7.0.