CN214427673U

CN214427673U - Camera lens

Info

Publication number: CN214427673U
Application number: CN202120898837.8U
Authority: CN
Inventors: 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-10-19
Anticipated expiration: 2031-04-28

Abstract

The application discloses a camera lens, which comprises in order from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; and an eighth lens having a negative optical power. At least one lens of the first lens to the eighth lens is a glass aspherical lens. The total effective focal length f of the camera lens and the maximum half field angle Semi-FOV of the camera lens meet the following conditions: f × tan (Semi-FOV) > 7.0 mm.

Description

Camera lens

Technical Field

The present application relates to the field of optical elements, and in particular, to an imaging lens.

Background

With the vigorous development of portable electronic products such as smart phones, various smart phone manufacturers have made higher design requirements for camera lenses mounted on smart phones. At present, most of the imaging lenses are developing towards large image plane, large aperture, high imaging quality and the like.

However, as the application fields of portable electronic products such as smart phones are wider and wider, the imaging quality of the portable electronic products is reduced to different degrees when the portable electronic products are used in environments with large temperature differences, and the reliability of the camera lens is further reduced. How to make the camera lens have strong temperature adaptability on the basis of meeting the characteristics of miniaturization, large image plane and the like, namely, the camera lens can normally work in an environment with large temperature difference is one of the problems to be solved by many lens designers at present.

SUMMERY OF THE UTILITY MODEL

An aspect of the present disclosure provides an imaging lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a positive optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; and an eighth lens having a negative optical power. At least one lens of the first lens to the eighth lens is a glass aspherical lens; the total effective focal length f of the camera lens and the maximum half field angle Semi-FOV of the camera lens can meet the following requirements: f × tan (Semi-FOV) > 7.0 mm.

In one embodiment, the refractive index N1 of the first lens and the refractive index N4 of the fourth lens may satisfy: (N4+ N1)/(N4-N1) < 20.

In one embodiment, the abbe number V4 of the fourth lens, the abbe number V5 of the fifth lens, the refractive index N4 of the fourth lens, and the refractive index N5 of the fifth lens may satisfy: (V4-V5)/(N4+ N5) > 6.0.

In one embodiment, the separation distance T78 on the optical axis of the seventh lens and the eighth lens, the central thickness CT7 on the optical axis of the seventh lens, and the central thickness CT8 on the optical axis of the eighth lens may satisfy: T78/(CT7+ CT8) is more than 1 and less than or equal to 1.2.

In one embodiment, a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, and a separation distance T34 on the optical axis of the third lens and the fourth lens may satisfy: (T34-T23)/T12 is not more than 0.8 and not more than 1.5.

In one embodiment, a center thickness CT6 of the sixth lens on the optical axis, a separation distance T45 of the fourth lens and the fifth lens on the optical axis, and a separation distance T56 of the fifth lens and the sixth lens on the optical axis may satisfy: 2.5 < (CT6+ T56)/T45 < 5.5.

In one embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens may satisfy: -2.0. ltoreq. f3/f2 < -1.0.

In one embodiment, the effective focal length f1 of the first lens and the effective focal length f7 of the seventh lens may satisfy: f7/f1 is more than or equal to 1.3 and less than 1.9.

In one embodiment, the total effective focal length f of the image pickup lens, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens may satisfy: f/(f7+ f8) is more than or equal to 0.9 and less than 1.5.

In one embodiment, the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens may satisfy: f1/f6 is more than 0 and less than 0.3.

In one embodiment, the total effective focal length f of the imaging lens, the radius of curvature R11 of the object-side surface of the sixth lens, and the radius of curvature R12 of the image-side surface of the sixth lens may satisfy: 0 < f/R11-f/| R12| < 0.5.

In one embodiment, the total effective focal length f of the imaging lens, the radius of curvature R13 of the object-side surface of the seventh lens, and the radius of curvature R15 of the object-side surface of the eighth lens may satisfy: f/R13-f/R15 is more than 3.5 and less than or equal to 4.0.

In one embodiment, the entrance pupil diameter EPD of the imaging lens and the maximum half field angle Semi-FOV of the imaging lens may satisfy: 3.5mm < EPD/tan (Semi-FOV) is less than or equal to 4.5 mm.

In one embodiment, a distance TTL on an optical axis from an object side surface of the first lens to an imaging surface of the imaging lens and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the imaging lens may satisfy: TTL/ImgH is less than 1.3.

Another aspect of the present disclosure provides an image capturing lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a positive optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; and an eighth lens having a negative optical power. At least one lens of the first lens to the eighth lens is a glass aspherical lens; the refractive index N1 of the first lens and the refractive index N4 of the fourth lens can satisfy the following conditions: (N4+ N1)/(N4-N1) < 20.

The camera lens is applicable to portable electronic products and has at least one beneficial effect of miniaturization, large image plane, good temperature performance, good imaging quality and the like.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;

fig. 2A to 2C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 1, respectively;

fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application;

fig. 4A to 4C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 2, respectively;

fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application;

fig. 6A to 6C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 3, respectively;

fig. 7 is a schematic configuration diagram showing an imaging lens according to embodiment 4 of the present application;

fig. 8A to 8C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 4, respectively;

fig. 9 is a schematic configuration diagram showing an imaging lens according to embodiment 5 of the present application;

fig. 10A to 10C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 5, respectively;

fig. 11 is a schematic configuration diagram showing an imaging lens according to embodiment 6 of the present application;

fig. 12A to 12C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens of embodiment 6;

fig. 13 is a schematic configuration diagram showing an imaging lens according to embodiment 7 of the present application; and

fig. 14A to 14C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of example 7, respectively.

Detailed Description

For a better understanding of the present application, various aspects of the present 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 present application and does not limit the scope of the present 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 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, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" 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. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present 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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

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

An image pickup lens according to an exemplary embodiment of the present application may include eight lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, respectively. The eight lenses are arranged in order from the object side to the image side along the optical axis. Any adjacent two lenses of the first lens to the eighth lens may have a spacing distance therebetween.

According to an exemplary embodiment of the present application, the first lens may have a positive optical power; the second lens may have a positive or negative optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a positive power or a negative power; the fifth lens may have a positive power or a negative power; the sixth lens may have a positive optical power; the seventh lens may have a positive optical power; and the eighth lens may have a negative optical power. This application is favorable to reducing the holistic aberration of camera lens through the focal power of each lens of rational distribution.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: f × tan (Semi-FOV) > 7.0mm, where f is the total effective focal length of the camera lens and Semi-FOV is the maximum half field angle of the camera lens. More specifically, f and Semi-FOV further satisfy: f × tan (Semi-FOV) > 8.0 mm. Satisfying f × tan (Semi-FOV) > 7.0mm, the light-entering amount of the camera lens can be increased.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: (N4+ N1)/(N4-N1) < 20, where N1 is the refractive index of the first lens and N4 is the refractive index of the fourth lens. More specifically, N4 and N1 may further satisfy: (N4+ N1)/(N4-N1) < 16. The requirements of (N4+ N1)/(N4-N1) < 20 are met, the imaging effect of the camera lens in a dark environment can be enhanced, and the image definition of the camera lens in a bright environment can be enhanced.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: (V4-V5)/(N4+ N5) > 6.0, wherein V4 is the Abbe number of the fourth lens, V5 is the Abbe number of the fifth lens, N4 is the refractive index of the fourth lens, and N5 is the refractive index of the fifth lens. The (V4-V5)/(N4+ N5) > 6.0 is satisfied, the convergence capability of the lens to light rays can be improved, and the aberration of the lens is favorably reduced.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1 < T78/(CT7+ CT8) ≦ 1.2, wherein T78 is an interval distance between the seventh lens and the eighth lens on the optical axis, CT7 is a center thickness of the seventh lens on the optical axis, and CT8 is a center thickness of the eighth lens on the optical axis. The requirement that T78/(CT7+ CT8) is more than 1 and less than or equal to 1.2 is met, the capability of the lens for correcting curvature of field can be improved, and the curvature of field sensitivity of an image plane is reduced.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.8 ≦ (T34-T23)/T12 ≦ 1.5, where T12 is an interval distance between the first lens and the second lens on the optical axis, T23 is an interval distance between the second lens and the third lens on the optical axis, and T34 is an interval distance between the third lens and the fourth lens on the optical axis. The falling-off test method meets the requirement that (T34-T23)/T12 is more than or equal to 0.8 and less than or equal to 1.5, can reduce the falling risk of the lens, improves the falling reliability of the lens, and ensures that the requirement of unchanged quality after the falling-off test can be met when the image plane of the lens is larger.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 2.5 < (CT6+ T56)/T45 < 5.5, wherein CT6 is the central thickness of the sixth lens on the optical axis, T45 is the separation distance of the fourth lens and the fifth lens on the optical axis, and T56 is the separation distance of the fifth lens and the sixth lens on the optical axis. More specifically, CT6, T56, and T45 may further satisfy: 2.8 < (CT6+ T56)/T45 < 5.5. Satisfy 2.5 < (CT6+ T56)/T45 < 5.5, can effectively reduce the lens size, make the whole size of lens less.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: -2.0 ≦ f3/f2 < -1.0, where f2 is the effective focal length of the second lens and f3 is the effective focal length of the third lens. More specifically, f3 and f2 may further satisfy: -2.0. ltoreq. f3/f2 < -1.3. Satisfying-2.0 ≤ f3/f2 < -1.0, controlling the light angle of the edge field of the lens within a reasonable range, and effectively reducing the sensitivity of the second lens and the third lens.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: f7/f1 is more than or equal to 1.3 and less than 1.9, wherein f1 is the effective focal length of the first lens, and f7 is the effective focal length of the seventh lens. Satisfying f7/f1 of 1.3-1.9, the sensitivity of the whole pick-up lens can be effectively reduced, and the eccentricity sensitivity generated when the first lens is a glass lens can be reduced.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: f/(f7+ f8) < 1.5, where f is the total effective focal length of the imaging lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens. F/(f7+ f8) is more than or equal to 0.9 and less than 1.5, and the deflection angles of light rays in the seventh lens and the eighth lens can be effectively controlled, so that the lens has good processing characteristics.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0 < f1/f6 < 0.3, where f1 is the effective focal length of the first lens and f6 is the effective focal length of the sixth lens. More specifically, the requirement that 0 < f1/f6 < 0.3 is met can effectively control the deflection angle of light rays in the sixth lens, so that the lens has good processing characteristics.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0 < f/R11-f/| R12| < 0.5, where f is the total effective focal length of the imaging lens, R11 is the radius of curvature of the object-side surface of the sixth lens, and R12 is the radius of curvature of the image-side surface of the sixth lens. The requirement that f/R11-f/| R12| < 0.5 is more than 0 is met, the overall optical length of the lens can be reduced, and the overall lens is thinner.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 3.5 < f/R13-f/R15 ≤ 4.0, wherein f is the total effective focal length of the imaging lens, R13 is the radius of curvature of the object-side surface of the seventh lens, and R15 is the radius of curvature of the object-side surface of the eighth lens. More specifically, f, R13, and R15 may further satisfy: f/R13-f/R15 is more than 3.6 and less than or equal to 4.0. f/R13-f/R15 of more than 3.5 and less than or equal to 4.0 are satisfied, so that the camera lens is favorable for better balancing aberration, the deflection angle of a chief ray is favorably and reasonably controlled, and the matching degree of the lens and the chip is improved.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 3.5mm < EPD/tan (Semi-FOV) is less than or equal to 4.5mm, wherein EPD is the entrance pupil diameter of the camera lens, and Semi-FOV is the maximum half field angle of the camera lens. More specifically, EPD and Semi-FOV further may satisfy: 3.8mm < EPD/tan (Semi-FOV) is less than or equal to 4.5 mm. The lens meets the requirement that EPD/tan (Semi-FOV) is more than 3.5mm and less than or equal to 4.5mm, the light inlet quantity of the whole lens can be improved, and the transmittance of the lens is improved.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: TTL/ImgH < 1.3, wherein, TTL is the distance between the object side surface of the first lens and the imaging surface of the camera lens on the optical axis, and ImgH is half of the length of the diagonal line of the effective pixel area on the imaging surface of the camera lens. The TTL/ImgH is less than 1.3, which is beneficial to the miniaturization of the lens.

In an exemplary embodiment, an imaging lens according to the present application further includes a stop disposed between the object side and the first lens. Alternatively, the above-described image pickup lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an image forming surface. The application provides an image pickup lens having characteristics of miniaturization, large image plane, good temperature performance, high imaging quality and the like. The imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above eight lenses. By reasonably distributing the focal power, the surface type, the material, the central thickness of each lens, the on-axis distance between each lens and the like, the incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the camera lens is more beneficial to production and processing.

In an exemplary embodiment, the first lens and the fourth lens may be made of glass; the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens can be made of plastic materials. Alternatively, at least one of the first lens to the eighth lens may be made of a glass material. Compared with plastics such as resin materials, the glass material has a wider refractive index range, more excellent optical performance and a small thermal expansion coefficient. This application adopts the glass lens to be favorable to making the back burnt of camera lens, total effective focal length to influence less along with the change of temperature, consequently, this application adopts glass lens and plastics lens to cooperate for improving the performance of camera lens.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the eighth 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 center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, 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. 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, the seventh lens, and the eighth lens is an aspherical mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces. Alternatively, at least one of the first to eighth lenses may be a glass aspherical lens.

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

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

Example 1

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

As shown in fig. 1, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

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

TABLE 1

In the present example, the total effective focal length f of the imaging lens is 8.61mm, and the maximum field angle FOV of the imaging lens is 88.0 °.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the eighth lens E8 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface 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. The high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S16 in example 1 are shown in tables 2-1 and 2-2 below₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

6.4750E-04

-5.6076E-03

1.6087E-02

-3.4426E-02

5.1479E-02

-5.3507E-02

3.8971E-02

S2

-4.6696E-03

-4.9196E-03

2.4519E-02

-6.2670E-02

9.9092E-02

-1.0400E-01

7.5614E-02

S3

-4.3202E-03

4.1758E-03

-1.1451E-02

2.3730E-02

-3.0704E-02

2.6946E-02

-1.6533E-02

S4

-1.3857E-04

1.3493E-02

-3.9293E-02

7.3714E-02

-8.9134E-02

7.3002E-02

-4.1501E-02

S5

3.8106E-03

-2.1032E-02

8.7744E-02

-2.1330E-01

3.3215E-01

-3.4615E-01

2.4806E-01

S6

-6.5923E-03

1.9747E-02

-7.3986E-02

1.6895E-01

-2.5101E-01

2.5296E-01

-1.7676E-01

S7

-1.2794E-02

1.0276E-02

-3.9161E-02

8.1103E-02

-1.1526E-01

1.1426E-01

-7.9742E-02

S8

-1.3848E-02

1.6128E-02

-3.8306E-02

5.6912E-02

-5.8636E-02

4.2322E-02

-2.1583E-02

S9

-2.6931E-02

1.7785E-02

-1.8003E-02

1.5069E-02

-9.6460E-03

4.5017E-03

-1.4823E-03

S10

-2.7925E-02

1.2845E-02

-7.4571E-03

3.1839E-03

-8.5693E-04

9.5734E-05

2.3242E-05

S11

-2.5432E-02

8.7432E-03

-3.9266E-03

8.1070E-04

3.8848E-04

-4.2815E-04

1.8751E-04

S12

-2.6689E-02

8.4115E-03

-4.3434E-03

2.2366E-03

-8.6047E-04

2.2721E-04

-4.1051E-05

S13

-6.7174E-03

-2.8527E-03

8.1145E-04

-1.6997E-04

2.7545E-05

-3.1942E-06

2.6013E-07

S14

9.8187E-03

-5.0717E-03

1.0423E-03

-1.5680E-04

1.9003E-05

-1.7991E-06

1.2553E-07

S15

-8.2559E-03

2.4770E-03

-2.9501E-04

3.2951E-05

-3.7041E-06

3.2254E-07

-1.9484E-08

S16

-1.7316E-02

2.8822E-03

-3.2401E-04

2.5211E-05

-1.2966E-06

3.0454E-08

1.0487E-09

TABLE 2-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.0087E-02

7.3535E-03

-1.8980E-03

3.3747E-04

-3.9329E-05

2.7038E-06

-8.3112E-08

S2

-3.8942E-02

1.4311E-02

-3.7272E-03

6.7182E-04

-7.9667E-05

5.5889E-06

-1.7567E-07

S3

7.1694E-03

-2.1886E-03

4.6018E-04

-6.3443E-05

5.1626E-06

-1.8790E-07

0.0000E+00

S4

1.6542E-02

-4.6109E-03

8.8344E-04

-1.1170E-04

8.4917E-06

-2.9840E-07

0.0000E+00

S5

-1.2361E-01

4.2663E-02

-9.9744E-03

1.5024E-03

-1.3101E-04

4.9976E-06

0.0000E+00

S6

8.6390E-02

-2.9386E-02

6.8053E-03

-1.0217E-03

8.9550E-05

-3.4752E-06

0.0000E+00

S7

3.9236E-02

-1.3486E-02

3.1597E-03

-4.7957E-04

4.2397E-05

-1.6531E-06

0.0000E+00

S8

7.7934E-03

-1.9749E-03

3.4266E-04

-3.8682E-05

2.5547E-06

-7.4762E-08

0.0000E+00

S9

3.3377E-04

-4.8367E-05

3.8053E-06

-4.2564E-08

-1.6603E-08

9.2176E-10

0.0000E+00

S10

-1.2182E-05

2.4777E-06

-2.8814E-07

1.9931E-08

-7.6511E-10

1.2589E-11

0.0000E+00

S11

-4.9271E-05

8.4042E-06

-9.3969E-07

6.6573E-08

-2.7117E-09

4.8348E-11

0.0000E+00

S12

5.1198E-06

-4.4044E-07

2.5659E-08

-9.6649E-10

2.1237E-11

-2.0671E-13

0.0000E+00

S13

-1.4848E-08

5.8913E-10

-1.5862E-11

2.7526E-13

-2.7634E-15

1.2114E-17

0.0000E+00

S14

-6.1961E-09

2.1024E-10

-4.7412E-12

6.7132E-14

-5.3296E-16

1.7772E-18

0.0000E+00

S15

8.0637E-10

-2.2848E-11

4.3650E-13

-5.3810E-15

3.8676E-17

-1.2316E-19

0.0000E+00

S16

-1.2099E-10

4.9687E-12

-1.1574E-13

1.6000E-15

-1.2248E-17

4.0089E-20

0.0000E+00

Tables 2 to 2

Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 1. Fig. 2C shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 2A to 2C, the imaging lens system according to embodiment 1 can achieve good imaging quality.

Example 2

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

As shown in fig. 3, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the imaging lens is 8.61mm, and the maximum field angle FOV of the imaging lens is 88.1 °.

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

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.2458E-03

5.8619E-03

-2.3265E-02

4.8861E-02

-6.4419E-02

5.7079E-02

-3.5356E-02

S2

-5.2525E-03

1.5994E-03

-5.0187E-04

-6.3426E-03

1.6890E-02

-2.2019E-02

1.8003E-02

S3

-2.2848E-03

-2.7110E-03

5.3649E-03

-2.4736E-03

-3.3277E-03

7.1170E-03

-6.3751E-03

S4

8.4398E-04

8.3591E-03

-2.0815E-02

3.1628E-02

-2.7099E-02

1.1647E-02

2.9580E-04

S5

1.2907E-03

-1.8201E-03

9.2235E-03

-2.1105E-02

2.4950E-02

-1.1499E-02

-6.1285E-03

S6

-6.6565E-03

2.4754E-02

-9.0041E-02

1.9823E-01

-2.8592E-01

2.8132E-01

-1.9270E-01

S7

-1.0534E-02

5.5921E-03

-2.7999E-02

6.0890E-02

-8.8719E-02

8.8767E-02

-6.1880E-02

S8

-1.0289E-02

8.5078E-03

-2.4469E-02

3.7599E-02

-3.9049E-02

2.8021E-02

-1.4095E-02

S9

-2.2055E-02

8.9063E-03

-6.2932E-03

3.0330E-03

-3.8925E-04

-7.1095E-04

6.3806E-04

S10

-2.4411E-02

8.7677E-03

-4.8373E-03

2.1505E-03

-6.2627E-04

8.0713E-05

1.6773E-05

S11

-2.1864E-02

7.2693E-03

-4.2154E-03

1.5493E-03

-9.7488E-05

-2.3517E-04

1.3509E-04

S12

-2.5041E-02

8.0720E-03

-4.7365E-03

2.6692E-03

-1.0779E-03

2.9426E-04

-5.4749E-05

S13

-1.0167E-02

-2.5871E-03

9.2419E-04

-1.9331E-04

2.8769E-05

-3.0683E-06

2.3565E-07

S14

5.3245E-03

-5.0529E-03

1.2755E-03

-2.1545E-04

2.6851E-05

-2.4870E-06

1.6806E-07

S15

-5.2756E-03

1.5060E-03

-1.3463E-04

1.4802E-05

-2.1558E-06

2.2112E-07

-1.4461E-08

S16

-1.4585E-02

2.7863E-03

-3.9597E-04

4.2041E-05

-3.2933E-06

1.8258E-07

-6.8880E-09

TABLE 4-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.5627E-02

-4.9603E-03

1.1225E-03

-1.7677E-04

1.8411E-05

-1.1401E-06

3.1789E-08

S2

-9.9635E-03

3.8375E-03

-1.0314E-03

1.8984E-04

-2.2813E-05

1.6124E-06

-5.0832E-08

S3

3.4593E-03

-1.2266E-03

2.8678E-04

-4.2727E-05

3.6826E-06

-1.3988E-07

0.0000E+00

S4

-3.3058E-03

1.9397E-03

-5.8834E-04

1.0283E-04

-9.7879E-06

3.9249E-07

0.0000E+00

S5

1.2201E-02

-8.1266E-03

3.0284E-03

-6.6716E-04

8.1402E-05

-4.2534E-06

0.0000E+00

S6

9.2585E-02

-3.1025E-02

7.0895E-03

-1.0516E-03

9.1163E-05

-3.5025E-06

0.0000E+00

S7

3.0196E-02

-1.0240E-02

2.3566E-03

-3.4985E-04

3.0110E-05

-1.1364E-06

0.0000E+00

S8

4.9967E-03

-1.2393E-03

2.0986E-04

-2.3055E-05

1.4768E-06

-4.1742E-08

0.0000E+00

S9

-2.8237E-04

7.7605E-05

-1.3832E-05

1.5635E-06

-1.0215E-07

2.9413E-09

0.0000E+00

S10

-1.0074E-05

2.1764E-06

-2.6429E-07

1.8923E-08

-7.4774E-10

1.2617E-11

0.0000E+00

S11

-3.9128E-05

6.9980E-06

-8.0292E-07

5.7725E-08

-2.3709E-09

4.2460E-11

0.0000E+00

S12

7.0257E-06

-6.2160E-07

3.7223E-08

-1.4401E-09

3.2474E-11

-3.2410E-13

0.0000E+00

S13

-1.3002E-08

5.0827E-10

-1.3665E-11

2.3906E-13

-2.4375E-15

1.0929E-17

0.0000E+00

S14

-8.1118E-09

2.7347E-10

-6.2406E-12

9.1376E-14

-7.7195E-16

2.8580E-18

0.0000E+00

S15

6.2266E-10

-1.8014E-11

3.4805E-13

-4.3159E-15

3.1100E-17

-9.9067E-20

0.0000E+00

S16

1.6820E-10

-2.3738E-12

1.1366E-14

1.7163E-16

-2.8670E-18

1.2778E-20

0.0000E+00

TABLE 4-2

Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 2. Fig. 4C shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 4A to 4C, the imaging lens according to embodiment 2 can achieve good imaging quality.

Example 3

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

As shown in fig. 5, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In the present example, the total effective focal length f of the imaging lens is 8.39mm, and the maximum field angle FOV of the imaging lens is 89.8 °.

Table 5 shows a basic parameter table of the imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 6-1, 6-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

8.1761E-04

-3.4477E-03

7.1863E-03

-9.6125E-03

8.6595E-03

-5.5930E-03

2.7153E-03

S2

-2.9364E-03

-1.2108E-02

5.3929E-02

-1.2915E-01

1.9792E-01

-2.0595E-01

1.5050E-01

S3

-2.0788E-03

-9.4293E-03

3.1867E-02

-5.6248E-02

6.5512E-02

-5.2279E-02

2.9190E-02

S4

-6.0416E-04

1.2753E-02

-4.3928E-02

1.0008E-01

-1.4762E-01

1.4829E-01

-1.0411E-01

S5

7.2905E-04

-1.0113E-02

3.9369E-02

-9.2470E-02

1.4216E-01

-1.4816E-01

1.0739E-01

S6

-3.9272E-03

6.9029E-03

-2.5701E-02

5.5348E-02

-7.7619E-02

7.4463E-02

-4.9880E-02

S7

-9.8833E-03

-7.8340E-03

1.4369E-02

-2.7536E-02

3.8102E-02

-3.8314E-02

2.7997E-02

S8

-7.8402E-03

-5.7615E-03

3.2430E-03

-1.6791E-04

-2.6658E-03

3.2061E-03

-2.0598E-03

S9

-6.0039E-03

-9.4029E-03

1.2308E-02

-1.2089E-02

9.0350E-03

-4.9839E-03

2.0050E-03

S10

-9.2486E-03

-3.8769E-03

4.2142E-03

-2.6648E-03

1.2299E-03

-4.1234E-04

1.0009E-04

S11

-2.0400E-02

5.7361E-03

-2.5777E-03

1.2948E-03

-6.3462E-04

2.3198E-04

-5.9574E-05

S12

-3.3961E-02

9.9861E-03

-2.7541E-03

7.6575E-04

-2.2704E-04

5.6587E-05

-1.0228E-05

S13

-1.8786E-02

2.0493E-04

3.8788E-04

-9.3594E-05

7.6366E-06

3.6692E-07

-1.3118E-07

S14

1.4588E-03

-4.3663E-03

1.4879E-03

-3.2296E-04

4.7143E-05

-4.7677E-06

3.4181E-07

S15

-2.5925E-02

9.4155E-03

-1.9791E-03

2.8326E-04

-2.7940E-05

1.9260E-06

-9.4016E-08

S16

-3.2101E-02

8.8996E-03

-1.7142E-03

2.2822E-04

-2.1560E-05

1.4652E-06

-7.2016E-08

TABLE 6-1

TABLE 6-2

Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 6A to 6C, the imaging lens system according to embodiment 3 can achieve good imaging quality.

Example 4

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

As shown in fig. 7, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In the present example, the total effective focal length f of the imaging lens is 8.39mm, and the maximum field angle FOV of the imaging lens is 89.6 °.

Table 7 shows a basic parameter table of the imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 8-1, 8-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.4355E-04

2.0021E-04

-5.2662E-03

1.5941E-02

-2.5419E-02

2.5489E-02

-1.7278E-02

S2

-4.2218E-03

-6.1807E-03

3.6813E-02

-9.6976E-02

1.5698E-01

-1.6955E-01

1.2747E-01

S3

-1.5838E-03

-1.3742E-02

4.3875E-02

-7.5721E-02

8.5536E-02

-6.5699E-02

3.4984E-02

S4

-8.9082E-04

1.2594E-02

-3.4435E-02

5.9268E-02

-5.6982E-02

2.2011E-02

1.4703E-02

S5

6.8508E-05

6.1491E-03

-3.6493E-02

1.1925E-01

-2.4179E-01

3.2715E-01

-3.0653E-01

S6

-1.1411E-03

-9.4009E-03

4.1873E-02

-1.1502E-01

2.0258E-01

-2.4079E-01

1.9989E-01

S7

-9.0016E-03

-1.0954E-02

2.4845E-02

-4.8356E-02

6.5959E-02

-6.4907E-02

4.6713E-02

S8

-7.8841E-03

-4.7901E-03

3.4242E-03

-2.7929E-03

2.0127E-03

-1.5453E-03

1.1333E-03

S9

-1.0225E-02

3.7340E-04

-7.3925E-03

1.5371E-02

-1.7252E-02

1.2647E-02

-6.4537E-03

S10

-1.2155E-02

-6.3114E-04

4.7002E-05

1.4843E-03

-1.6639E-03

9.9410E-04

-3.8338E-04

S11

-1.8987E-02

2.4875E-03

1.3168E-03

-2.0275E-03

1.3529E-03

-6.1350E-04

1.9967E-04

S12

-3.1928E-02

7.7033E-03

-1.1347E-03

-1.2013E-04

1.3551E-04

-5.3299E-05

1.4314E-05

S13

-1.7086E-02

-4.4388E-04

6.9379E-04

-1.9077E-04

2.6995E-05

-2.2025E-06

1.0765E-07

S14

3.4939E-03

-4.8542E-03

1.6892E-03

-3.8783E-04

6.0158E-05

-6.4806E-06

4.9763E-07

S15

-2.4990E-02

9.3612E-03

-2.0222E-03

2.9692E-04

-2.9911E-05

2.0981E-06

-1.0404E-07

S16

-3.1960E-02

9.0890E-03

-1.8136E-03

2.4960E-04

-2.4309E-05

1.7044E-06

-8.6918E-08

TABLE 8-1

TABLE 8-2

Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 8B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 4. Fig. 8C shows a distortion curve of the imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 8A to 8C, the imaging lens according to embodiment 4 can achieve good imaging quality.

Example 5

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

As shown in fig. 9, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the imaging lens is 8.34mm, and the maximum field angle FOV of the imaging lens is 88.5 °.

Table 9 shows a basic parameter table of the imaging lens of embodiment 5, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 10-1, 10-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.3725E-03

7.6246E-03

-2.6300E-02

5.8238E-02

-8.4830E-02

8.4074E-02

-5.8481E-02

S2

3.2245E-03

-3.7642E-02

1.1960E-01

-2.4068E-01

3.2639E-01

-3.0890E-01

2.0873E-01

S3

4.8435E-03

-3.3936E-02

9.0538E-02

-1.5172E-01

1.7407E-01

-1.3984E-01

7.9818E-02

S4

4.8351E-03

-1.3268E-02

3.7403E-02

-7.1850E-02

9.7836E-02

-9.3677E-02

6.3469E-02

S5

7.2482E-04

1.6493E-02

-6.4947E-02

1.4062E-01

-1.9835E-01

1.9333E-01

-1.3358E-01

S6

1.9924E-03

-1.9546E-02

6.4944E-02

-1.3840E-01

1.9336E-01

-1.8381E-01

1.2177E-01

S7

-1.0296E-02

-7.1431E-03

1.2115E-02

-2.1866E-02

3.1267E-02

-3.4525E-02

2.8078E-02

S8

-4.8019E-03

-2.8777E-02

6.5006E-02

-9.9529E-02

1.0349E-01

-7.5037E-02

3.8507E-02

S9

-6.6492E-03

-2.2214E-02

3.3059E-02

-3.1776E-02

2.1033E-02

-9.6957E-03

3.1099E-03

S10

-9.1806E-03

-1.0897E-02

1.3572E-02

-1.0511E-02

5.6888E-03

-2.1788E-03

5.9479E-04

S11

-1.5688E-02

1.8394E-03

-8.7983E-04

7.9622E-04

-5.7529E-04

2.3784E-04

-5.9848E-05

S12

-2.7842E-02

6.8770E-03

-1.7504E-03

5.5303E-04

-2.2541E-04

7.2133E-05

-1.5661E-05

S13

-2.1114E-02

-1.0502E-04

3.9295E-04

-6.2327E-05

2.1444E-06

6.8817E-07

-1.2457E-07

S14

-3.6671E-03

-3.7783E-03

1.1756E-03

-2.0177E-04

2.3593E-05

-2.0072E-06

1.2671E-07

S15

-1.1544E-02

3.9089E-03

-6.9451E-04

9.4738E-05

-9.6907E-06

7.0934E-07

-3.6622E-08

S16

-1.6858E-02

3.5023E-03

-4.8221E-04

4.4421E-05

-2.8393E-06

1.2552E-07

-3.6985E-09

TABLE 10-1

TABLE 10-2

Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 10A to 10C, the imaging lens according to embodiment 5 can achieve good imaging quality.

Example 6

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

As shown in fig. 11, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In the present example, the total effective focal length f of the imaging lens is 8.42mm, and the maximum field angle FOV of the imaging lens is 88.0 °.

Table 11 shows a basic parameter table of the imaging lens of embodiment 6, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 12-1, 12-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 11

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.6996E-03

1.0576E-02

-4.0578E-02

9.5994E-02

-1.4952E-01

1.5917E-01

-1.1910E-01

S2

-8.2441E-04

-1.4426E-02

4.1376E-02

-6.9743E-02

7.4500E-02

-5.0584E-02

2.0383E-02

S3

-2.2715E-03

-2.1448E-03

4.5558E-03

1.1263E-03

-1.0838E-02

1.6421E-02

-1.3897E-02

S4

1.3812E-03

-4.6764E-03

1.9908E-02

-4.5720E-02

6.9070E-02

-7.0131E-02

4.9079E-02

S5

1.4613E-03

4.4119E-03

-1.1416E-02

1.0432E-02

6.4774E-03

-2.7201E-02

3.3262E-02

S6

-8.2538E-04

-1.2531E-03

-2.0359E-03

1.2488E-02

-2.7305E-02

3.4673E-02

-2.8305E-02

S7

-9.2791E-03

-9.5913E-03

2.2609E-02

-4.9425E-02

7.5115E-02

-7.9811E-02

5.9723E-02

S8

-3.1510E-03

-2.3845E-02

4.3705E-02

-5.9488E-02

5.7326E-02

-3.9349E-02

1.9343E-02

S9

-5.1976E-03

-2.4342E-02

3.2335E-02

-2.9387E-02

1.9460E-02

-9.3799E-03

3.2756E-03

S10

-8.3896E-03

-1.2400E-02

1.3501E-02

-9.3798E-03

4.7119E-03

-1.7212E-03

4.5661E-04

S11

-1.1898E-02

-2.5459E-03

2.7763E-03

-1.4015E-03

3.8874E-04

-6.7609E-05

9.2602E-06

S12

-2.4004E-02

1.9405E-03

1.7262E-03

-1.1161E-03

3.5421E-04

-7.4492E-05

1.1159E-05

S13

-1.6120E-02

-3.1960E-03

1.4351E-03

-2.9240E-04

3.7275E-05

-3.1029E-06

1.6713E-07

S14

1.3368E-03

-6.5605E-03

2.0357E-03

-3.7156E-04

4.6473E-05

-4.1813E-06

2.7445E-07

S15

-1.6103E-02

4.8555E-03

-7.2841E-04

8.0112E-05

-6.9338E-06

4.6067E-07

-2.2664E-08

S16

-2.4029E-02

5.5447E-03

-8.3294E-04

8.5669E-05

-6.2824E-06

3.3116E-07

-1.2499E-08

TABLE 12-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.3629E-02

-2.4372E-02

6.6372E-03

-1.2537E-03

1.5606E-04

-1.1508E-05

3.8062E-07

S2

-3.1705E-03

-1.2553E-03

9.0557E-04

-2.6014E-04

4.1595E-05

-3.6244E-06

1.3469E-07

S3

7.5563E-03

-2.7386E-03

6.5888E-04

-1.0112E-04

8.9594E-06

-3.4869E-07

0.0000E+00

S4

-2.3934E-02

8.0992E-03

-1.8601E-03

2.7593E-04

-2.3800E-05

9.0502E-07

0.0000E+00

S5

-2.3409E-02

1.0541E-02

-3.0900E-03

5.7195E-04

-6.0820E-05

2.8353E-06

0.0000E+00

S6

1.5501E-02

-5.7576E-03

1.4311E-03

-2.2782E-04

2.0991E-05

-8.5101E-07

0.0000E+00

S7

-3.1573E-02

1.1710E-02

-2.9771E-03

4.9367E-04

-4.8050E-05

2.0805E-06

0.0000E+00

S8

-6.8086E-03

1.6997E-03

-2.9355E-04

3.3332E-05

-2.2373E-06

6.7235E-08

0.0000E+00

S9

-8.2231E-04

1.4624E-04

-1.7931E-05

1.4400E-06

-6.8205E-08

1.4500E-09

0.0000E+00

S10

-8.7358E-05

1.1859E-05

-1.1089E-06

6.7690E-08

-2.4233E-09

3.8537E-11

0.0000E+00

S11

-1.7548E-06

4.0430E-07

-6.5751E-08

6.3431E-09

-3.2823E-10

7.0203E-12

0.0000E+00

S12

-1.2020E-06

9.2142E-08

-4.9188E-09

1.7505E-10

-3.7650E-12

3.7282E-14

0.0000E+00

S13

-5.3805E-09

6.8414E-11

1.7655E-12

-9.2186E-14

1.5791E-15

-1.0209E-17

0.0000E+00

S14

-1.3114E-08

4.5009E-10

-1.0794E-11

1.7174E-13

-1.6310E-15

7.0156E-18

0.0000E+00

S15

8.0675E-10

-2.0385E-11

3.5561E-13

-4.0675E-15

2.7435E-17

-8.2667E-20

0.0000E+00

S16

3.3425E-10

-6.2139E-12

7.7723E-14

-6.1706E-16

2.7740E-18

-5.2965E-21

0.0000E+00

TABLE 12-2

Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 6. Fig. 12C shows a distortion curve of the imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 12A to 12C, the imaging lens according to embodiment 6 can achieve good imaging quality.

Example 7

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

As shown in fig. 13, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

In this example, the total effective focal length f of the imaging lens is 8.44mm, and the maximum field angle FOV of the imaging lens is 88.0 °.

Table 13 shows a basic parameter table of the imaging lens of embodiment 7, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 14-1, 14-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

Watch 13

TABLE 14-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.8607E-02

-7.1337E-03

1.9384E-03

-3.6469E-04

4.5193E-05

-3.3186E-06

1.0942E-07

S2

1.9521E-02

-7.8752E-03

2.1769E-03

-4.0617E-04

4.8851E-05

-3.4126E-06

1.0491E-07

S3

2.2079E-02

-7.0309E-03

1.5240E-03

-2.1427E-04

1.7605E-05

-6.4119E-07

0.0000E+00

S4

-1.9840E-02

7.0287E-03

-1.6782E-03

2.5735E-04

-2.2838E-05

8.9007E-07

0.0000E+00

S5

1.0088E-02

-4.6564E-03

1.5014E-03

-3.1408E-04

3.7962E-05

-2.0033E-06

0.0000E+00

S6

1.2278E-02

-4.0131E-03

8.9284E-04

-1.2861E-04

1.0799E-05

-4.0084E-07

0.0000E+00

S7

-2.4665E-02

9.1352E-03

-2.3259E-03

3.8713E-04

-3.7889E-05

1.6519E-06

0.0000E+00

S8

-4.0166E-03

9.9877E-04

-1.7224E-04

1.9570E-05

-1.3169E-06

3.9756E-08

0.0000E+00

S9

-3.8874E-04

5.8427E-05

-5.5728E-06

2.9048E-07

-4.6872E-09

-1.2792E-10

0.0000E+00

S10

-7.4290E-05

1.0096E-05

-9.4951E-07

5.8458E-08

-2.1138E-09

3.3975E-11

0.0000E+00

S11

-5.1234E-06

6.4591E-07

-6.7899E-08

5.2597E-09

-2.4764E-10

5.0984E-12

0.0000E+00

S12

-2.5253E-06

2.1837E-07

-1.2940E-08

5.0183E-10

-1.1497E-11

1.1815E-13

0.0000E+00

S13

9.6534E-10

-1.5479E-10

7.1735E-12

-1.7772E-13

2.3707E-15

-1.3442E-17

0.0000E+00

S14

-8.1951E-09

2.7479E-10

-6.4524E-12

1.0080E-13

-9.4416E-16

4.0314E-18

0.0000E+00

S15

8.0762E-10

-2.0251E-11

3.5065E-13

-3.9818E-15

2.6669E-17

-7.9819E-20

0.0000E+00

S16

2.6678E-10

-5.0251E-12

6.5174E-14

-5.5472E-16

2.8100E-18

-6.5083E-21

0.0000E+00

TABLE 14-2

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

In summary, examples 1 to 7 each satisfy the relationship shown in table 15.

Watch 15

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.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a positive optical power;

a second lens having an optical power;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having positive optical power;

a seventh lens having positive optical power; and

an eighth lens having a negative optical power;

at least one lens of the first lens to the eighth lens is a glass aspherical lens;

the total effective focal length f of the camera lens and the maximum half field angle Semi-FOV of the camera lens meet the following conditions: f × tan (Semi-FOV) > 7.0 mm.

2. The imaging lens according to claim 1, wherein an abbe number V4 of the fourth lens, an abbe number V5 of the fifth lens, a refractive index N4 of the fourth lens, and a refractive index N5 of the fifth lens satisfy: (V4-V5)/(N4+ N5) > 6.0.

3. The imaging lens according to claim 1, wherein a separation distance T78 on the optical axis between the seventh lens and the eighth lens, a central thickness CT7 on the optical axis between the seventh lens and the eighth lens, and a central thickness CT8 on the optical axis between the eighth lens and the seventh lens satisfy: T78/(CT7+ CT8) is more than 1 and less than or equal to 1.2.

4. The imaging lens according to claim 1, wherein a separation distance T12 on the optical axis between the first lens and the second lens, a separation distance T23 on the optical axis between the second lens and the third lens, and a separation distance T34 on the optical axis between the third lens and the fourth lens satisfy: (T34-T23)/T12 is not more than 0.8 and not more than 1.5.

5. The imaging lens according to claim 1, wherein a center thickness CT6 of the sixth lens on the optical axis, a separation distance T45 of the fourth lens and the fifth lens on the optical axis, and a separation distance T56 of the fifth lens and the sixth lens on the optical axis satisfy: 2.5 < (CT6+ T56)/T45 < 5.5.

6. The imaging lens according to claim 1, wherein an effective focal length f2 of the second lens and an effective focal length f3 of the third lens satisfy: -2.0. ltoreq. f3/f2 < -1.0.

7. The imaging lens according to claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f7 of the seventh lens satisfy: f7/f1 is more than or equal to 1.3 and less than 1.9.

8. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens, an effective focal length f7 of the seventh lens, and an effective focal length f8 of the eighth lens satisfy: f/(f7+ f8) is more than or equal to 0.9 and less than 1.5.

9. The imaging lens according to claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f6 of the sixth lens satisfy: f1/f6 is more than 0 and less than 0.3.

10. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens, a radius of curvature R11 of an object-side surface of the sixth lens, and a radius of curvature R12 of an image-side surface of the sixth lens satisfy: 0 < f/R11-f/| R12| < 0.5.

11. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens, a radius of curvature R13 of an object side surface of the seventh lens, and a radius of curvature R15 of an object side surface of the eighth lens satisfy: f/R13-f/R15 is more than 3.5 and less than or equal to 4.0.

12. An imaging lens according to any one of claims 1 to 11, characterized in that the entrance pupil diameter EPD of the imaging lens and the maximum half field angle Semi-FOV of the imaging lens satisfy: 3.5mm < EPD/tan (Semi-FOV) is less than or equal to 4.5 mm.

13. An imaging lens according to any one of claims 1 to 11, wherein a distance TTL from an object side surface of the first lens element to an imaging surface of the imaging lens on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the imaging lens satisfy: TTL/ImgH is less than 1.3.

14. An imaging lens according to any one of claims 1 to 11, wherein a refractive index N1 of the first lens and a refractive index N4 of the fourth lens satisfy: (N4+ N1)/(N4-N1) < 20.

15. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a positive optical power;

a second lens having an optical power;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having positive optical power;

a seventh lens having positive optical power; and

an eighth lens having a negative optical power;

the refractive index N1 of the first lens and the refractive index N4 of the fourth lens satisfy: (N4+ N1)/(N4-N1) < 20.

16. The imaging lens according to claim 15, wherein an abbe number V4 of the fourth lens, an abbe number V5 of the fifth lens, a refractive index N4 of the fourth lens, and a refractive index N5 of the fifth lens satisfy: (V4-V5)/(N4+ N5) > 6.0.

17. The imaging lens according to claim 15, wherein a separation distance T78 between the seventh lens and the eighth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy: T78/(CT7+ CT8) is more than 1 and less than or equal to 1.2.

18. The imaging lens according to claim 15, wherein a separation distance T12 on the optical axis between the first lens and the second lens, a separation distance T23 on the optical axis between the second lens and the third lens, and a separation distance T34 on the optical axis between the third lens and the fourth lens satisfy: (T34-T23)/T12 is not more than 0.8 and not more than 1.5.

19. The imaging lens according to claim 15, wherein a center thickness CT6 of the sixth lens on the optical axis, a separation distance T45 of the fourth lens and the fifth lens on the optical axis, and a separation distance T56 of the fifth lens and the sixth lens on the optical axis satisfy: 2.5 < (CT6+ T56)/T45 < 5.5.

20. The imaging lens of claim 15, wherein an effective focal length f2 of the second lens and an effective focal length f3 of the third lens satisfy: -2.0. ltoreq. f3/f2 < -1.0.

21. The imaging lens of claim 15, wherein an effective focal length f1 of the first lens and an effective focal length f7 of the seventh lens satisfy: f7/f1 is more than or equal to 1.3 and less than 1.9.

22. The imaging lens of claim 15, wherein a total effective focal length f of the imaging lens, an effective focal length f7 of the seventh lens, and an effective focal length f8 of the eighth lens satisfy: f/(f7+ f8) is more than or equal to 0.9 and less than 1.5.

23. The imaging lens of claim 15, wherein an effective focal length f1 of the first lens and an effective focal length f6 of the sixth lens satisfy: f1/f6 is more than 0 and less than 0.3.

24. The imaging lens of claim 15, wherein a total effective focal length f of the imaging lens, a radius of curvature R11 of an object-side surface of the sixth lens, and a radius of curvature R12 of an image-side surface of the sixth lens satisfy: 0 < f/R11-f/| R12| < 0.5.

25. The imaging lens of claim 15, wherein a total effective focal length f of the imaging lens, a radius of curvature R13 of an object-side surface of the seventh lens, and a radius of curvature R15 of an object-side surface of the eighth lens satisfy: f/R13-f/R15 is more than 3.5 and less than or equal to 4.0.

26. An imaging lens according to any one of claims 15-25, characterized in that the entrance pupil diameter EPD of the imaging lens and the maximum half field angle Semi-FOV of the imaging lens satisfy: 3.5mm < EPD/tan (Semi-FOV) is less than or equal to 4.5 mm.

27. An image-taking lens according to any one of claims 15 to 25, wherein a distance TTL on the optical axis from an object-side surface of the first lens to an imaging surface of the image-taking lens to half ImgH a diagonal length of an effective pixel area on the imaging surface of the image-taking lens satisfies: TTL/ImgH is less than 1.3.