CN111856725B

CN111856725B - Camera lens set

Info

Publication number: CN111856725B
Application number: CN202010914117.6A
Authority: CN
Inventors: 黄林; 汤禹; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2024-11-19
Anticipated expiration: 2040-09-03
Also published as: CN111856725A

Abstract

The present application discloses a camera lens group, which includes, in order from the object side to the image side along the optical axis: a first lens with negative optical power, whose object side surface is a concave surface; a second lens with optical power; a third lens with positive optical power; a fourth lens with optical power; a fifth lens with positive optical power, whose object side surface is a concave surface; a sixth lens with optical power; and a seventh lens with negative optical power; wherein the maximum field of view FOV of the camera lens group can satisfy: FOV≥120.1°; the maximum field of view FOV of the camera lens group and the total effective focal length f of the camera lens group can satisfy: 1＜f×tan(FOV/4)＜1.7.

Description

Image pickup lens group

Technical Field

The present application relates to the field of optical elements, and more particularly, to an imaging lens group.

Background

A camera module is generally arranged on a portable device such as a mobile phone, so that the mobile phone has a camera function. An image sensor of a Charge-coupled Device (CCD) type or an image sensor of a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) type is generally provided in the image pickup module, and an image pickup lens group is provided. The image pickup lens group can collect light rays on the object side, imaging light rays travel along a light path of the image pickup lens group and irradiate the image sensor, and then the image sensor converts light signals into electric signals to form image data.

The rapid development of the mobile phone camera module, especially the popularization of large-size and high-pixel CMOS chips, makes mobile phone manufacturers put forward more stringent requirements on the imaging quality of the camera lens group. In addition, with the improvement of the performance and the reduction of the size of the CCD and CMOS devices, higher requirements are also put on the high imaging quality of the matched imaging lens group.

In order to meet imaging requirements, an imaging lens group capable of achieving both wide angle and high imaging quality is required.

Disclosure of Invention

The application provides an imaging lens group, which sequentially comprises from an object side to an image side along an optical axis: a first lens with negative focal power, the object side surface of which is a concave surface; a second lens having optical power; a third lens having positive optical power; a fourth lens having optical power; a fifth lens with positive focal power, the object side surface of which is a concave surface; a sixth lens having optical power; a seventh lens having negative optical power; wherein, the maximum field angle FOV of the camera lens group can satisfy: FOV is more than or equal to 120.1 degrees; the maximum field angle FOV of the imaging lens group and the total effective focal length f of the imaging lens group may satisfy: 1 < f×tan (FOV/4) < 1.7.

In one embodiment, the object side surface of the first lens element to the image side surface of the seventh lens element have at least one aspherical mirror surface.

In one embodiment, the effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens group may satisfy: f/f5 is more than 0.5 and less than 1.0.

In one embodiment, the maximum effective radius DT31 of the object-side surface of the third lens and the maximum effective radius DT21 of the object-side surface of the second lens may satisfy: DT31/DT21 is 0.5 < 1.

In one embodiment, the separation distance T12 of the first lens and the second lens on the optical axis and the separation distance T23 of the second lens and the third lens on the optical axis may satisfy: T12/T23 is more than 0.9 and less than 1.4.

In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis may satisfy: CT1/CT2 is more than 1.5 and less than 2.2.

In one embodiment, the radius of curvature R6 of the image side surface of the third lens and the effective focal length f3 of the third lens may satisfy: 0 < |R6/f3| < 0.8.

In one embodiment, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens and the effective focal length f5 of the fifth lens may satisfy: -2.1 < (R9+R10)/f 5 is less than or equal to-1.57.

In one embodiment, the radius of curvature R1 of the object side surface of the first lens and the total effective focal length f of the imaging lens group may satisfy: -1.8 < R1/f < -1.2.

In one embodiment, the center thickness CT5 of the fifth lens on the optical axis and the center thickness CT6 of the sixth lens on the optical axis may satisfy: CT6/CT5 is more than 0.2 and less than 0.7.

In one embodiment, the total effective focal length f of the imaging lens group and the effective focal length f1 of the first lens may satisfy: -0.35.ltoreq.f/f 1 < 0.

In one embodiment, an on-axis distance SAG51 between an intersection of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens and an on-axis distance SAG61 between an intersection of the object side surface of the sixth lens and the optical axis and an effective radius vertex of the object side surface of the sixth lens may satisfy: SAG51/SAG61 is more than or equal to 0.17 and less than 0.6.

Another aspect of the present application provides an imaging lens assembly, including, in order from an object side to an image side along an optical axis: a first lens with negative focal power, the object side surface of which is a concave surface; a second lens having optical power; a third lens having positive optical power; a fourth lens having optical power; a fifth lens with positive focal power, the object side surface of which is a concave surface; a sixth lens having optical power; a seventh lens having negative optical power; wherein, the maximum field angle FOV of the camera lens group can satisfy: FOV is more than or equal to 120.1 degrees; the distance T12 between the first lens and the second lens on the optical axis and the distance T23 between the second lens and the third lens on the optical axis can satisfy: T12/T23 is more than 0.9 and less than 1.4.

In one embodiment, the maximum field angle FOV of the imaging lens group and the total effective focal length f of the imaging lens group may satisfy: 1 < f×tan (FOV/4) < 1.7.

The application adopts seven lenses, and the focal power, the surface shape, the center thickness of each lens, the axial spacing among the lenses and the like of each lens are reasonably distributed, so that the imaging lens group has at least one beneficial effect of miniaturization, wide angle, high imaging quality, clear imaging and the like. The miniaturized camera lens group is suitable for being used as a rear lens of the mobile phone; the wide-angle type camera lens group has the characteristics of large visual angle and wide visual field, and the range of a scene observed at a certain visual point is not large as that of a human eye at the same visual point, so that a quite large clear range can be shown, and the perspective effect of a picture can be emphasized.

Drawings

Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

Fig. 1 shows a schematic configuration diagram of an imaging lens group according to embodiment 1 of the present application; fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 1;

Fig. 3 is a schematic diagram showing the structure of an imaging lens group according to embodiment 2 of the present application; fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 2;

fig. 5 shows a schematic configuration diagram of an imaging lens group according to embodiment 3 of the present application; fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 3;

Fig. 7 shows a schematic configuration diagram of an imaging lens group according to embodiment 4 of the present application; fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 4;

Fig. 9 shows a schematic configuration diagram of an imaging lens group according to embodiment 5 of the present application; fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 5;

Fig. 11 is a schematic diagram showing the structure of an imaging lens group according to embodiment 6 of the present application; fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 6;

Fig. 13 is a schematic diagram showing the structure of an imaging lens group according to embodiment 7 of the present application; fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 7;

fig. 15 shows a schematic configuration diagram of an imaging lens group according to embodiment 8 of the present application; fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 8;

Fig. 17 is a schematic diagram showing the structure of an imaging lens group according to embodiment 9 of the present application; fig. 18A to 18D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 9.

Detailed Description

For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

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

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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 closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

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

The features, principles, and other aspects of the present application are described in detail below.

The imaging lens group according to the exemplary embodiment of the present application may include, for example, seven lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis. In the first lens to the seventh lens, any adjacent two lenses may have an air space therebetween.

In an exemplary embodiment, the first lens has a negative optical power, and its object-side surface may be concave; the second lens has positive optical power or negative optical power; the third lens has positive focal power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive focal power, and the object side surface of the fifth lens can be a concave surface; the sixth lens has positive optical power or negative optical power; the seventh lens has negative optical power. The imaging quality of the imaging lens group can be effectively improved by reasonably controlling the positive and negative distribution of the focal power of each component of the lens and the surface curvature of the lens.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the condition that FOV is equal to or greater than 120.1 °, wherein FOV is the maximum field angle of the imaging lens group. The FOV is more than or equal to 120.1 degrees, so that the view field of the camera lens group is wide, and the camera lens group can clearly image in a larger view field range. More specifically, the FOV may satisfy: FOV is 120.1 DEG-126.1 deg.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 1 < f×tan (Semi-FOV/2) < 1.7, where Semi-FOV is half of the maximum field angle of the imaging lens group and f is the total effective focal length of the imaging lens group. Satisfies 1 < f×tan (Semi-FOV/2) < 1.7, is favorable for realizing the imaging effect of a large image plane of the imaging lens group, further has higher optical performance, and has better processing technology. More specifically, semi-FOV and f may satisfy: 1.30 < f×tan (Semi-FOV/2) < 1.45.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.5 < f/f5 < 1.0, where f5 is an effective focal length of the fifth lens, and f is a total effective focal length of the imaging lens group. The f/f5 is less than 0.5 and less than 1.0, and the fifth lens can bear larger focal power, thereby being beneficial to correcting the aberration of the imaging lens group and shortening the total length of the imaging lens group. More specifically, f5 and f may satisfy: 0.81 < f/f5 < 0.95.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.5 < DT31/DT21 < 1, wherein DT31 is the maximum effective radius of the object side surface of the third lens element and DT21 is the maximum effective radius of the object side surface of the second lens element. By defining the maximum effective radius ratio of the object side surface of the third lens and the object side surface of the second lens within this range, the size of the imaging lens group can be reduced, the demand for miniaturization can be satisfied, and the resolution of the imaging lens group can be improved. More specifically, DT31 and DT21 may satisfy: 0.65 < DT31/DT21 < 0.75.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.9 < T12/T23 < 1.4, where T12 is a separation distance of the first lens and the second lens on the optical axis, and T23 is a separation distance of the second lens and the third lens on the optical axis. Satisfies 0.9 < T12/T23 < 1.4, is favorable for improving the assembly stability of the lenses of the camera lens group and the consistency of mass production, and is favorable for improving the production yield of the camera lens group. More specifically, T12 and T23 may satisfy: T12/T23 is more than 1.05 and less than 1.20.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 1.5 < CT1/CT2 < 2.2, where CT1 is the center thickness of the first lens on the optical axis and CT2 is the center thickness of the second lens on the optical axis. The angle of the principal ray of the camera lens group can be adjusted to satisfy the condition that CT1/CT2 is smaller than 2.2 and more than 1.5, so that the relative brightness of the camera lens group can be effectively improved, and the definition of an image plane is improved. More specifically, CT1 and CT2 may satisfy: CT1/CT2 is more than 1.65 and less than 2.10.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0< |r6/f3| < 0.8, where R6 is the radius of curvature of the image side surface of the third lens, and f3 is the effective focal length of the third lens. Satisfies 0< |R6/f3| < 0.8, and can reduce the optical distortion of the imaging lens group so as to ensure that the imaging lens group has better imaging quality. More specifically, R6 and f3 may satisfy: 0.50 < |R6/f3| < 0.70.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression-2.1 < (r9+r10)/f5+.1.57, where R9 is a radius of curvature of an object side surface of the fifth lens, R10 is a radius of curvature of an image side surface of the fifth lens, and f5 is an effective focal length of the fifth lens. Satisfies-2.1 < (R9+R10)/f 5 less than or equal to-1.57, can effectively reduce the optical sensitivity of the fifth lens, and is favorable for realizing mass production of the fifth lens. More specifically, R9, R10, and f5 may satisfy: -1.95 < (R9+R10)/f 5 is less than or equal to-1.57.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the condition of-1.8 < R1/f < -1.2, where R1 is a radius of curvature of an object side surface of the first lens, and f is a total effective focal length of the imaging lens group. Satisfies R1/f < -1.2 which is less than-1.8, is beneficial to controlling the incidence angle of off-axis vision field rays of the camera lens group at the imaging surface so as to increase the matching performance of the camera lens group with the photosensitive element and the band-pass filter. More specifically, R1 and f may satisfy: -1.63 < R1/f < -1.47.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.2 < CT6/CT5 < 0.7, where CT5 is the center thickness of the fifth lens on the optical axis and CT6 is the center thickness of the sixth lens on the optical axis. The lens of the imaging lens group can obtain enough interval space and higher surface freedom degree, and can better correct the field curvature and astigmatism of the imaging lens group. More specifically, CT5 and CT6 may satisfy: CT6/CT5 is more than 0.30 and less than 0.54.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression-0.35+.f/f 1 < 0, where f is the total effective focal length of the imaging lens group and f1 is the effective focal length of the first lens. Satisfies-0.35 < f/f1 < 0, is favorable for adjusting the position of light rays, and is favorable for shortening the total length of the imaging lens group. More specifically, f and f1 may satisfy: -0.35.ltoreq.f/f 1 < -0.22.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.17+.SAG 51/SAG61 < 0.6, wherein SAG51 is an on-axis distance between an intersection point of the object side surface of the fifth lens element and the optical axis to an effective radius vertex of the object side surface of the fifth lens element, and SAG61 is an on-axis distance between an intersection point of the object side surface of the sixth lens element and the optical axis to an effective radius vertex of the object side surface of the sixth lens element. Satisfies SAG51/SAG61 less than 0.6 and 0.17, can reasonably control the deflection angle of the chief ray, so as to improve the matching degree of the camera lens group and the chip, and is beneficial to adjusting the structure of the camera lens group. More specifically, SAG51 and SAG61 may satisfy: SAG51/SAG61 is more than or equal to 0.17 and less than 0.42.

In an exemplary embodiment, the imaging lens group may further include at least one diaphragm. The diaphragm may be provided at an appropriate position as required, for example, between the second lens and the third lens. Optionally, the above-mentioned imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.

The imaging lens group according to the above embodiment of the present application may employ a plurality of lenses, for example, seven lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the imaging lens group can be effectively reduced, the sensitivity of the imaging lens group can be reduced, and the processability of the imaging lens group can be improved, so that the imaging lens group is more beneficial to production and processing and is applicable to portable electronic products. Meanwhile, the imaging lens group also has the excellent optical performances of wide angle, clear imaging, high resolution, high imaging quality and the like.

In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror. The aspherical 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 center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are aspherical mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens group can be varied to achieve the various results and advantages described in the present specification without departing from the technical solution claimed in the present application. For example, although seven lenses are described as an example in the embodiment, the imaging lens group is not limited to include seven lenses. The imaging lens group may further include other numbers of lenses, if necessary.

Specific examples of the imaging lens group applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An imaging lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an imaging lens group according to embodiment 1 of the present application.

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

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

Table 1 shows a basic parameter table of an imaging lens group of embodiment 1, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 1

In embodiment 1, the value of the total effective focal length f of the imaging lens group is 2.26mm, the value of the f-number Fno of the imaging lens group is 2.28, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 5.85mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S17 is 3.53mm, and the value of the maximum field angle FOV is 120.10 ° (i.e., the half of the maximum field angle FOV Semi-FOV value is 60.05 °).

In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=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 aspherical i-th order. The following Table 2 shows the higher order coefficients A ₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈ and A ₂₀ that can be used for each of the aspherical mirrors S1 to S14 in example 1.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.3482E-01

-1.8174E-01

1.4205E-01

-8.7992E-02

4.0423E-02

-1.3019E-02

2.7519E-03

-3.3981E-04

1.8404E-05

S2

3.3970E-01

-1.6705E-01

-2.2900E-01

1.0424E+00

-1.7487E+00

1.6372E+00

-8.8809E-01

2.5561E-01

-2.9477E-02

S3

7.4056E-02

-2.8660E-01

6.4410E-01

-1.4793E+00

2.3451E+00

-2.4675E+00

1.6187E+00

-5.8135E-01

8.5606E-02

S4

2.1422E-02

-3.2773E-01

2.4818E+00

-1.3389E+01

4.6750E+01

-1.0357E+02

1.4069E+02

-1.0690E+02

3.5032E+01

S5

3.0359E-02

-4.1570E-01

4.0274E+00

-2.5300E+01

9.7958E+01

-2.3914E+02

3.5837E+02

-3.0151E+02

1.0913E+02

S6

1.6527E-02

-8.3657E-02

5.8515E-01

-2.2534E+00

5.3042E+00

-7.7867E+00

6.7518E+00

-3.1119E+00

5.7494E-01

S7

-1.2277E-01

-1.5539E-02

1.6175E-01

-1.8555E-01

-4.3804E-02

2.8788E-01

-2.9015E-01

1.1876E-01

-1.4960E-02

S8

-1.0682E-01

2.5638E-02

6.1084E-02

-1.0237E-01

9.4557E-02

-6.0103E-02

2.4804E-02

-5.8586E-03

6.0269E-04

S9

5.2426E-02

-7.6643E-02

1.2042E-01

-1.2469E-01

8.3459E-02

-3.3754E-02

7.6643E-03

-8.5395E-04

3.1357E-05

S10

1.0159E-01

-6.3273E-02

3.7062E-02

-1.2357E-04

-1.0610E-02

6.5060E-03

-1.8590E-03

2.5951E-04

-1.4461E-05

S11

-9.5231E-03

-1.3000E-02

1.3284E-02

-8.6811E-03

1.5579E-03

6.4528E-04

-3.4764E-04

5.9770E-05

-3.6514E-06

S12

-7.2466E-03

-2.3734E-02

3.3438E-02

-2.3818E-02

9.2451E-03

-2.0985E-03

2.8224E-04

-2.1235E-05

7.0280E-07

S13

-4.0132E-02

-9.5386E-02

1.0244E-01

-5.4327E-02

1.7089E-02

-3.2794E-03

3.7620E-04

-2.3647E-05

6.2371E-07

S14

-9.3915E-02

3.1824E-02

-6.8209E-03

7.2975E-04

-1.5269E-06

-8.9552E-06

9.0476E-07

-2.6673E-08

-1.9072E-10

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 1, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve of the imaging lens group of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the imaging lens group of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. Fig. 2D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 1, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the imaging lens group provided in embodiment 1 can achieve good imaging quality.

Example 2

An imaging lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an imaging lens group according to embodiment 2 of the present application.

As shown in fig. 3, the imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

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

In embodiment 2, the value of the total effective focal length f of the imaging lens group is 2.26mm, the value of the f-number Fno of the imaging lens group is 2.28, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 5.97mm, the value of half the diagonal length ImgH of the effective pixel area on the imaging surface S17 is 3.63mm, and the value of the maximum field angle FOV is 123.62 °.

Table 3 shows a basic parameter table of an imaging lens group of embodiment 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 3 Table 3

TABLE 4 Table 4

Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve of the imaging lens group of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the imaging lens group of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. Fig. 4D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 2, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the imaging lens group provided in embodiment 2 can achieve good imaging quality.

Example 3

An imaging lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic configuration diagram of an imaging lens group according to embodiment 3 of the present application.

As shown in fig. 5, the imaging lens group sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

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

In embodiment 3, the value of the total effective focal length f of the imaging lens group is 2.30mm, the value of the f-number Fno of the imaging lens group is 2.28, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.04mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S17 is 3.63mm, and the value of the maximum field angle FOV is 126.00 °.

Table 5 shows a basic parameter table of an imaging lens group of embodiment 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 5

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.3204E-01

-1.8058E-01

1.4187E-01

-8.7836E-02

3.9730E-02

-1.2391E-02

2.4981E-03

-2.9129E-04

1.4871E-05

S2

3.3876E-01

-2.8725E-01

2.6959E-01

-1.0048E-01

-1.6744E-01

3.1778E-01

-2.4636E-01

9.1332E-02

-1.3008E-02

S3

8.4872E-02

-3.8963E-01

1.0868E+00

-2.8008E+00

5.3009E+00

-7.2707E+00

6.5929E+00

-3.4096E+00

7.5230E-01

S4

4.6972E-02

-4.1933E-01

2.3523E+00

-1.0254E+01

3.2597E+01

-7.4720E+01

1.1331E+02

-9.8535E+01

3.6826E+01

S5

9.5764E-03

1.0482E-01

-1.2349E+00

2.7399E+00

1.5023E+01

-1.2230E+02

3.5157E+02

-4.7728E+02

2.5386E+02

S6

-1.1224E-02

3.0158E-02

4.6882E-02

3.3473E-01

-3.0623E+00

9.1472E+00

-1.4188E+01

1.1453E+01

-3.8470E+00

S7

-1.4450E-01

7.3575E-02

-3.0461E-02

2.9945E-02

-1.4040E-01

2.5291E-01

-2.4600E-01

1.2500E-01

-2.6050E-02

S8

-1.0308E-01

2.8895E-02

5.5022E-02

-1.1077E-01

1.1079E-01

-6.8394E-02

2.5535E-02

-5.1995E-03

4.3535E-04

S9

5.3380E-02

-7.5723E-02

9.7149E-02

-7.0249E-02

2.7292E-02

-2.5962E-03

-2.0612E-03

7.7802E-04

-8.5375E-05

S10

8.0115E-02

3.5660E-02

-1.4961E-01

1.9396E-01

-1.3208E-01

5.2419E-02

-1.1888E-02

1.3855E-03

-6.1318E-05

S11

-1.4270E-02

-8.6604E-03

1.0685E-02

-7.8738E-03

1.7286E-03

4.2396E-04

-2.7670E-04

4.9524E-05

-3.0778E-06

S12

4.5307E-02

-9.9317E-02

1.1373E-01

-7.8989E-02

3.3383E-02

-8.7105E-03

1.3750E-03

-1.2073E-04

4.5345E-06

S13

-5.2237E-02

-8.8965E-02

1.0606E-01

-6.1094E-02

2.0921E-02

-4.4006E-03

5.5928E-04

-3.9553E-05

1.1998E-06

S14

-1.0546E-01

4.5105E-02

-1.3011E-02

2.2582E-03

-1.7587E-04

-1.1009E-05

3.7047E-06

-3.0682E-07

9.0405E-09

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the imaging lens group of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the imaging lens group of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. Fig. 6D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 3, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the imaging lens group provided in embodiment 3 can achieve good imaging quality.

Example 4

An imaging lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of an imaging lens group according to embodiment 4 of the present application.

As shown in fig. 7, the imaging lens group includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

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

In embodiment 4, the value of the total effective focal length f of the imaging lens group is 2.37mm, the value of the f-number Fno of the imaging lens group is 2.28, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.06mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S17 is 3.53mm, and the value of the maximum field angle FOV is 120.38 °.

Table 7 shows a basic parameter table of an imaging lens group of embodiment 4, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 7

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.2075E-01

-1.7302E-01

1.4592E-01

-9.8977E-02

4.9318E-02

-1.6875E-02

3.7034E-03

-4.6722E-04

2.5795E-05

S2

3.3349E-01

-3.7893E-01

6.7105E-01

-1.0472E+00

1.1883E+00

-8.8267E-01

3.9191E-01

-9.3433E-02

9.1846E-03

S3

8.5962E-02

-3.1161E-01

4.4021E-01

1.0170E-01

-2.0476E+00

3.8997E+00

-3.7171E+00

2.0206E+00

-5.1119E-01

S4

5.2571E-02

-1.4742E-01

-1.1632E+00

1.3947E+01

-6.4046E+01

1.6041E+02

-2.3116E+02

1.8082E+02

-5.9357E+01

S5

-3.7647E-02

-5.9366E-01

9.2482E+00

-9.3120E+01

5.6339E+02

-2.1188E+03

4.8368E+03

-6.1438E+03

3.3270E+03

S6

-1.6793E-02

-4.4890E-02

1.3286E+00

-7.7027E+00

2.5337E+01

-5.0959E+01

6.1352E+01

-4.0495E+01

1.1224E+01

S7

-1.5923E-01

1.2054E-01

-3.6772E-02

-1.9143E-01

4.9494E-01

-6.3864E-01

4.6392E-01

-1.7960E-01

2.8495E-02

S8

-1.0669E-01

5.5268E-02

1.3796E-02

-8.2410E-02

1.0864E-01

-8.0575E-02

3.5416E-02

-8.5991E-03

8.8938E-04

S9

5.1545E-02

-7.8270E-02

1.1245E-01

-9.6901E-02

5.3770E-02

-1.9129E-02

4.1659E-03

-4.9758E-04

2.4381E-05

S10

8.0993E-02

2.8299E-02

-1.4185E-01

1.9379E-01

-1.4104E-01

6.2399E-02

-1.6688E-02

2.4699E-03

-1.5489E-04

S11

-3.3303E-02

5.3329E-02

-6.8408E-02

4.6430E-02

-1.8900E-02

4.6146E-03

-6.4467E-04

4.5693E-05

-1.1693E-06

S12

-2.2792E-02

7.3518E-02

-1.0294E-01

7.3736E-02

-3.1405E-02

8.1707E-03

-1.2705E-03

1.0830E-04

-3.8908E-06

S13

-4.9896E-02

-6.5705E-02

6.5027E-02

-2.8605E-02

6.6390E-03

-6.9092E-04

-8.8455E-06

8.0027E-06

-4.8236E-07

S14

-1.0138E-01

2.7548E-02

2.1127E-03

-4.6430E-03

1.6873E-03

-3.1654E-04

3.3435E-05

-1.8756E-06

4.3355E-08

TABLE 8

Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve of the imaging lens group of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the imaging lens group of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. Fig. 8D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 4, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the imaging lens group provided in embodiment 4 can achieve good imaging quality.

Example 5

An imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of an imaging lens group according to embodiment 5 of the present application.

As shown in fig. 9, the imaging lens group includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

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

In embodiment 5, the value of the total effective focal length f of the imaging lens group is 2.33mm, the value of the f-number Fno of the imaging lens group is 2.78, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.21mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S17 is 3.53mm, and the value of the maximum field angle FOV is 120.44 °.

Table 9 shows a basic parameter table of an imaging lens group of embodiment 5, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 9

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.2320E-01

-1.7344E-01

1.3774E-01

-8.7356E-02

4.0926E-02

-1.3282E-02

2.7896E-03

-3.3883E-04

1.8047E-05

S2

3.3527E-01

-2.9026E-01

3.2552E-01

-2.4246E-01

6.0218E-04

2.4683E-01

-2.7211E-01

1.2228E-01

-2.0085E-02

S3

8.3517E-02

-3.6053E-01

9.6700E-01

-2.5451E+00

5.0993E+00

-7.4541E+00

7.0082E+00

-3.6350E+00

7.8404E-01

S4

5.0482E-02

-5.2322E-01

3.5616E+00

-1.8834E+01

7.0249E+01

-1.7638E+02

2.7723E+02

-2.4318E+02

9.0671E+01

S5

1.3663E-02

-1.2181E-01

1.9080E+00

-2.3703E+01

1.5356E+02

-5.8016E+02

1.2776E+03

-1.5235E+03

7.5923E+02

S6

-5.0249E-03

2.6462E-03

1.6335E-01

-1.0691E-01

-1.7526E+00

6.8426E+00

-1.1995E+01

1.0508E+01

-3.7537E+00

S7

-1.4532E-01

4.1342E-02

-7.6305E-02

6.4790E-01

-2.1152E+00

3.5703E+00

-3.4112E+00

1.7399E+00

-3.6692E-01

S8

-8.5225E-02

-1.3858E-02

1.3179E-01

-1.9826E-01

1.7199E-01

-8.9345E-02

2.4244E-02

-1.8964E-03

-2.7961E-04

S9

4.9231E-02

-4.3166E-02

-4.9998E-03

8.5530E-02

-1.0942E-01

7.0623E-02

-2.5856E-02

5.1130E-03

-4.2583E-04

S10

5.6703E-02

1.2233E-01

-2.8820E-01

3.1669E-01

-1.9842E-01

7.5864E-02

-1.7500E-02

2.2470E-03

-1.2484E-04

S11

-3.4275E-02

8.4065E-02

-1.3680E-01

1.1195E-01

-5.4756E-02

1.6564E-02

-3.0394E-03

3.1077E-04

-1.3603E-05

S12

-3.8825E-03

9.5647E-03

-1.1551E-02

4.5639E-03

-4.7135E-04

-2.6707E-04

1.1063E-04

-1.6623E-05

9.1803E-07

S13

-7.0270E-02

-5.3964E-02

8.6160E-02

-5.6216E-02

2.1183E-02

-4.8957E-03

6.8740E-04

-5.4026E-05

1.8277E-06

S14

-1.0733E-01

5.6782E-02

-2.2384E-02

6.3684E-03

-1.2949E-03

1.8209E-04

-1.6704E-05

8.9260E-07

-2.0904E-08

Table 10

Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 5, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 10B shows an astigmatism curve of the imaging lens group of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the imaging lens group of embodiment 5, which represents distortion magnitude values corresponding to different angles of view. Fig. 10D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 5, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging lens group provided in embodiment 5 can achieve good imaging quality.

Example 6

An imaging lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of an imaging lens group according to embodiment 6 of the present application.

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

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

In embodiment 6, the value of the total effective focal length f of the imaging lens group is 2.39mm, the value of the f-number Fno of the imaging lens group is 2.28, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.33mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S17 is 3.63mm, and the value of the maximum field angle FOV is 123.64 °.

Table 11 shows a basic parameter table of an imaging lens group of embodiment 6, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 11

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.1972E-01

-1.6023E-01

1.1881E-01

-7.0151E-02

3.0683E-02

-9.3565E-03

1.8577E-03

-2.1431E-04

1.0876E-05

S2

3.1403E-01

-2.7261E-01

3.6991E-01

-5.1964E-01

5.9038E-01

-4.5577E-01

2.0820E-01

-5.0058E-02

4.8781E-03

S3

9.0578E-02

-4.4014E-01

1.3461E+00

-3.9935E+00

8.5367E+00

-1.2688E+01

1.2137E+01

-6.5179E+00

1.4740E+00

S4

6.5234E-02

-6.3075E-01

3.9198E+00

-1.8974E+01

6.3610E+01

-1.4215E+02

1.9965E+02

-1.5717E+02

5.2849E+01

S5

1.3268E-02

-5.7593E-02

9.5541E-01

-1.2535E+01

7.8741E+01

-2.7755E+02

5.5752E+02

-5.9655E+02

2.6333E+02

S6

8.0435E-03

-1.0309E-02

-6.8224E-02

9.0032E-01

-3.8167E+00

9.2451E+00

-1.3353E+01

1.0608E+01

-3.5717E+00

S7

-1.1771E-01

-7.0634E-02

-1.7448E-01

1.4793E+00

-4.1712E+00

6.6128E+00

-6.1009E+00

3.0433E+00

-6.3330E-01

S8

-5.1992E-02

-9.9425E-02

1.8194E-01

-1.5353E-01

4.4415E-02

6.4872E-02

-8.2575E-02

3.7515E-02

-6.2373E-03

S9

4.7066E-02

-4.1144E-02

2.2015E-02

4.9647E-03

-1.0008E-02

4.8691E-03

-1.3028E-03

2.0711E-04

-1.6314E-05

S10

8.3276E-02

1.0836E-02

-8.5513E-02

1.1022E-01

-7.0543E-02

2.6616E-02

-5.8812E-03

6.8744E-04

-3.2079E-05

S11

-6.3692E-03

-1.9151E-02

-2.8024E-04

1.3064E-02

-1.0464E-02

3.8881E-03

-7.7510E-04

8.0948E-05

-3.5120E-06

S12

3.4764E-02

-1.0331E-01

1.1498E-01

-7.2395E-02

2.7918E-02

-6.8795E-03

1.0727E-03

-9.7296E-05

3.9148E-06

S13

-1.0080E-01

-4.2462E-02

8.5233E-02

-5.4645E-02

1.8560E-02

-3.5689E-03

3.7826E-04

-1.9286E-05

2.9758E-07

S14

-1.1476E-01

6.1210E-02

-2.2927E-02

5.8514E-03

-1.0166E-03

1.1866E-04

-8.9569E-06

3.9794E-07

-7.9436E-09

Table 12

Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 6, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 12B shows an astigmatism curve of the imaging lens group of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the imaging lens group of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. Fig. 12D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 6, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the imaging lens group provided in embodiment 6 can achieve good imaging quality.

Example 7

An imaging lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an imaging lens group according to embodiment 7 of the present application.

As shown in fig. 13, the imaging lens group includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

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

In embodiment 7, the value of the total effective focal length f of the imaging lens group is 2.34mm, the value of the f-number Fno of the imaging lens group is 2.28, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.07mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S17 is 3.63mm, and the value of the maximum field angle FOV is 124.86 °.

Table 13 shows a basic parameter table of an imaging lens group of embodiment 7, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 13

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.3248E-01

-1.8416E-01

1.4705E-01

-9.2205E-02

4.2069E-02

-1.3181E-02

2.6623E-03

-3.1052E-04

1.5842E-05

S2

3.4732E-01

-3.0487E-01

2.9055E-01

-8.9551E-02

-2.3536E-01

4.0854E-01

-3.0045E-01

1.0455E-01

-1.3692E-02

S3

8.7549E-02

-4.1164E-01

1.2304E+00

-3.4094E+00

6.9351E+00

-9.8958E+00

9.0410E+00

-4.6415E+00

1.0122E+00

S4

3.9222E-02

-3.7228E-01

2.0464E+00

-9.3940E+00

3.3154E+01

-8.4125E+01

1.3668E+02

-1.2369E+02

4.7159E+01

S5

1.1768E-02

-2.9320E-02

8.7651E-01

-1.4886E+01

1.0230E+02

-3.8578E+02

8.2691E+02

-9.4721E+02

4.4921E+02

S6

-8.9899E-03

5.6191E-02

-2.5497E-01

2.0460E+00

-8.5729E+00

1.9780E+01

-2.6426E+01

1.9212E+01

-5.9290E+00

S7

-1.4832E-01

8.7225E-02

-8.2862E-02

2.1888E-01

-5.4788E-01

7.8052E-01

-6.6232E-01

3.1063E-01

-6.1914E-02

S8

-1.0410E-01

2.7093E-02

6.2534E-02

-1.1966E-01

1.1756E-01

-7.3103E-02

2.8030E-02

-5.9391E-03

5.2337E-04

S9

5.3292E-02

-7.9201E-02

1.1360E-01

-1.0513E-01

6.6459E-02

-2.7669E-02

7.1865E-03

-1.0613E-03

6.8200E-05

S10

9.0266E-02

-1.5671E-02

-4.4723E-02

7.9757E-02

-5.8317E-02

2.3525E-02

-5.1789E-03

5.3649E-04

-1.5998E-05

S11

-7.1492E-03

-2.0948E-02

2.5124E-02

-1.9372E-02

7.6244E-03

-1.4898E-03

1.0355E-04

7.2908E-06

-1.0666E-06

S12

-3.9342E-03

-3.0871E-02

4.3644E-02

-3.2152E-02

1.3258E-02

-3.2466E-03

4.7264E-04

-3.8034E-05

1.3085E-06

S13

-4.1341E-02

-1.0286E-01

1.1399E-01

-6.2690E-02

2.0547E-02

-4.1339E-03

5.0109E-04

-3.3618E-05

9.5928E-07

S14

-9.5297E-02

3.1158E-02

-4.3635E-03

-8.7995E-04

5.2698E-04

-1.0895E-04

1.1971E-05

-6.9395E-07

1.6778E-08

TABLE 14

Fig. 14A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 7, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve of the imaging lens group of embodiment 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the imaging lens group of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. Fig. 14D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 7, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 14A to 14D, the imaging lens group provided in embodiment 7 can achieve good imaging quality.

Example 8

An imaging lens group according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic configuration diagram of an imaging lens group according to embodiment 8 of the present application.

As shown in fig. 15, the imaging lens group includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

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

In embodiment 8, the value of the total effective focal length f of the imaging lens group is 2.29mm, the value of the f-number Fno of the imaging lens group is 2.28, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.04mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S17 is 3.63mm, and the value of the maximum field angle FOV is 124.70 °.

Table 15 shows a basic parameter table of an imaging lens group of embodiment 8, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 16 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 8, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 15

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.3170E-01

-1.8667E-01

1.5284E-01

-9.8979E-02

4.6910E-02

-1.5331E-02

3.2381E-03

-3.9549E-04

2.1129E-05

S2

3.5382E-01

-3.3958E-01

4.4355E-01

-4.9549E-01

4.4280E-01

-2.9957E-01

1.4702E-01

-5.2859E-02

1.0036E-02

S3

8.6982E-02

-4.0757E-01

1.2096E+00

-3.3486E+00

6.9158E+00

-1.0218E+01

9.7687E+00

-5.2624E+00

1.2033E+00

S4

3.7236E-02

-3.5860E-01

1.9239E+00

-8.5274E+00

3.0255E+01

-8.0518E+01

1.3918E+02

-1.3373E+02

5.3846E+01

S5

5.3122E-03

1.6505E-01

-1.8144E+00

6.3629E+00

2.0206E+00

-9.6960E+01

3.3074E+02

-4.8146E+02

2.6608E+02

S6

-7.9031E-03

2.4075E-02

3.4195E-02

6.3994E-01

-4.3761E+00

1.1912E+01

-1.7447E+01

1.3549E+01

-4.4208E+00

S7

-1.4919E-01

9.0827E-02

-9.8613E-02

2.9154E-01

-7.2996E-01

1.0297E+00

-8.5704E-01

3.9269E-01

-7.6499E-02

S8

-1.0437E-01

2.9854E-02

5.4996E-02

-1.0335E-01

9.6026E-02

-5.6683E-02

2.0901E-02

-4.3040E-03

3.7030E-04

S9

5.3653E-02

-7.5085E-02

9.7877E-02

-7.9108E-02

4.1604E-02

-1.3102E-02

2.0155E-03

-3.9813E-05

-1.8256E-05

S10

8.6598E-02

-1.3891E-03

-7.2729E-02

1.0979E-01

-7.7307E-02

3.0768E-02

-6.8043E-03

7.3278E-04

-2.5837E-05

S11

-1.6270E-03

-4.0562E-02

5.6498E-02

-4.7322E-02

2.2701E-02

-6.4705E-03

1.0842E-03

-9.8125E-05

3.6894E-06

S12

1.2683E-02

-6.0563E-02

7.8399E-02

-5.6318E-02

2.3535E-02

-5.9294E-03

8.9099E-04

-7.3741E-05

2.5900E-06

S13

-4.2687E-02

-1.0394E-01

1.1588E-01

-6.3983E-02

2.1038E-02

-4.2437E-03

5.1562E-04

-3.4686E-05

9.9337E-07

S14

-9.4148E-02

3.0850E-02

-4.4771E-03

-7.6905E-04

5.0215E-04

-1.0788E-04

1.2288E-05

-7.3863E-07

1.8512E-08

Table 16

Fig. 16A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 8, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 16B shows an astigmatism curve of the imaging lens group of embodiment 8, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16C shows a distortion curve of the imaging lens group of embodiment 8, which represents distortion magnitude values corresponding to different angles of view. Fig. 16D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 8, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 16A to 16D, the imaging lens group provided in embodiment 8 can achieve good imaging quality.

Example 9

An imaging lens group according to embodiment 9 of the present application is described below with reference to fig. 17 to 18D. Fig. 17 shows a schematic configuration diagram of an imaging lens group according to embodiment 9 of the present application.

As shown in fig. 17, the imaging lens group includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

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

In embodiment 8, the value of the total effective focal length f of the imaging lens group is 2.28mm, the value of the f-number Fno of the imaging lens group is 2.28, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 5.96mm, the value of half the diagonal length ImgH of the effective pixel area on the imaging surface S17 is 3.63mm, and the value of the maximum field angle FOV is 124.60 °.

Table 17 shows a basic parameter table of an imaging lens group of embodiment 9, in which units of a radius of curvature, a thickness/distance, and a focal length are each millimeters (mm). Table 18 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 9, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 17

TABLE 18

Fig. 18A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 9, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 18B shows an astigmatism curve of the imaging lens group of embodiment 9, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 18C shows a distortion curve of the imaging lens group of embodiment 9, which represents distortion magnitude values corresponding to different angles of view. Fig. 18D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 9, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 18A to 18D, the imaging lens group provided in embodiment 9 can achieve good imaging quality.

In summary, examples 1 to 9 each satisfy the relationship shown in table 19.

Conditional\embodiment	1	2	3	4	5	6	7	8	9
										f/f5	0.84	0.85	0.87	0.94	0.87	0.87	0.89	0.88	0.86
f/f1	-0.34	-0.33	-0.32	-0.22	-0.35	-0.32	-0.33	-0.34	-0.34
										R1/f	-1.62	-1.61	-1.49	-1.62	-1.59	-1.51	-1.51	-1.62	-1.61
CT6/CT5	0.52	0.44	0.31	0.35	0.34	0.46	0.35	0.42	0.48
										(R9+R10)/f5	-1.90	-1.86	-1.77	-1.94	-1.78	-1.57	-1.87	-1.89	-1.89
f×tan(FOV/4)	1.31	1.35	1.41	1.37	1.35	1.43	1.42	1.39	1.38
										\|R6/f3\|	0.66	0.15	0.68	0.54	0.66	0.66	0.67	0.67	0.66
DT31/DT21	0.69	0.74	0.70	0.68	0.67	0.73	0.69	0.68	0.70
										T12/T23	1.13	1.09	1.09	1.19	1.08	1.12	1.09	1.08	1.09
CT1/CT2	1.76	1.75	1.72	2.09	1.73	1.86	1.67	1.75	1.78
										SAG51/SAG61	0.30	0.24	0.24	0.23	0.17	0.40	0.21	0.27	0.24

TABLE 19

The application also provides an imaging device provided with an electron-sensitive element for imaging, which can be a photosensitive coupling element (Charge Coupled Device, CCD) or a complementary metal-oxide-semiconductor element (Complementary Metal Oxide Semiconductor, CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging apparatus is equipped with the above-described imaging lens group.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the application is not limited to the specific combination of the above technical features, but also encompasses other technical features which may be combined with any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims

1. The imaging lens assembly is characterized by comprising, in order from an object side to an image side along an optical axis:

a first lens with negative focal power, the object side surface of which is a concave surface;

the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

A third lens having positive optical power, the image side surface of which is convex;

A fourth lens having negative optical power;

a fifth lens element with positive refractive power having a concave object-side surface and a convex image-side surface;

a sixth lens having optical power; and

A seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface;

wherein at least one of the second lens and the sixth lens has positive optical power;

The number of lenses with focal power in the imaging lens group is seven;

The maximum field angle FOV of the imaging lens group satisfies: FOV is more than or equal to 120.1 degrees and less than or equal to 126.1 degrees;

A separation distance T12 of the first lens and the second lens on the optical axis and a separation distance T23 of the second lens and the third lens on the optical axis satisfy: T12/T23 is more than 1.05 and less than 1.20;

the effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens group satisfy: 0.81 < f/f5 < 1.0.

2. The imaging lens system according to claim 1, wherein a maximum effective radius DT31 of an object side surface of the third lens and a maximum effective radius DT21 of an object side surface of the second lens satisfy:

0.65＜DT31/DT21＜0.75。

3. The imaging lens group according to claim 2, wherein a maximum field angle FOV of the imaging lens group and a total effective focal length f of the imaging lens group satisfy:

1.31≤f×tan(FOV/4)≤1.43。

4. The imaging lens group according to claim 1, wherein a center thickness CT1 of the first lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy:

1.65＜CT1/CT2＜2.10。

5. The imaging lens system according to claim 1, wherein a radius of curvature R6 of an image side surface of the third lens and an effective focal length f3 of the third lens satisfy:

0.15≤|R6/f3|＜0.7。

6. The imaging lens system according to claim 1, wherein a radius of curvature R9 of an object side surface of the fifth lens, a radius of curvature R10 of an image side surface of the fifth lens, and an effective focal length f5 of the fifth lens satisfy:

-1.95＜(R9+R10)/f5≤-1.57。

7. The imaging lens group according to claim 1, wherein a radius of curvature R1 of an object side surface of the first lens and a total effective focal length f of the imaging lens group satisfy:

-1.63＜R1/f＜-1.47。

8. The imaging lens group according to claim 1, wherein a center thickness CT5 of the fifth lens on the optical axis and a center thickness CT6 of the sixth lens on the optical axis satisfy:

0.30＜CT6/CT5＜0.54。

9. The imaging lens group according to any one of claims 1 to 8, wherein a total effective focal length f of the imaging lens group and an effective focal length f1 of the first lens satisfy:

-0.35≤f/f1≤-0.22。

10. The imaging lens system according to any one of claims 1 to 8, wherein an on-axis distance SAG51 between an intersection of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens and an on-axis distance SAG61 between an intersection of the object side surface of the sixth lens and the optical axis and an effective radius vertex of the object side surface of the sixth lens satisfy:

0.17≤SAG51/SAG61＜0.42。