CN114647062A

CN114647062A - Optical imaging lens

Info

Publication number: CN114647062A
Application number: CN202210305433.2A
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: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-06-21
Anticipated expiration: 2042-03-25
Also published as: CN114647062B

Abstract

The present application provides an optical imaging lens, sequentially comprising, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens each having a focal power, wherein the second lens has a positive focal power; the third lens is in a meniscus shape convex to the image side; the sixth lens has a meniscus shape; and half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens satisfies: ImgH >8mm, and an effective focal length f7 of the seventh lens and f8 of the eighth lens satisfy: -2< f7/f8< 0.

Description

Optical imaging lens

Technical Field

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

Background

With the development of science and technology, electronic products such as smart phones are rapidly developed, and the imaging requirements of people on photographing of smart phones are continuously improved. At present, camera lenses carried on electronic products such as mobile phones and the like are not limited to a single camera any more, but gradually develop into multiple cameras, and most high-end lenses use a combination mode of wide-angle and long-focus to realize the function of optical zooming.

However, the simple zoom function has not been able to satisfy the requirement of people for large image plane and high imaging quality. The large image plane and the large aperture lens are also gradually favored by users because they can collect more light information, have smaller optical aberration and better imaging quality, and provide users with the possibility of selecting the aperture size independently. In order to obtain a larger imaging surface, a higher optical lens is often required, but the height of the optical lens is limited by the overall height of the mobile phone, and the optical lens is difficult to further increase.

Disclosure of Invention

An aspect of the present disclosure provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising: 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 each having a focal power, wherein the second lens has a positive focal power; the third lens is in a meniscus shape convex to the image side; the sixth lens has a meniscus shape; and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens meets the following condition: ImgH >8mm, and an effective focal length f7 of the seventh lens and an effective focal length f8 of the eighth lens satisfy: -2< f7/f8< 0.

In some embodiments of the present application, at least four lenses of the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens have negative optical power.

In some embodiments of the present application, the half length ImgH of the diagonal line of the effective pixel area on the imaging plane of the optical imaging lens, the entrance pupil diameter EPD of the optical imaging lens, and the half Semi-FOV of the maximum field angle of the optical imaging lens satisfy: 0.7< EPD/(ImgH × tan (Semi-FOV) < 0.8.

In some embodiments of the present application, a half ImgH of a diagonal length of an effective pixel area on an imaging plane of the optical imaging lens, a half Semi-FOV of a maximum field angle of the optical imaging lens, and a distance TTL on the optical axis from an object side surface of the first lens to the imaging plane of the optical imaging lens satisfy: 1.2< TTL × tan (Semi-FOV)/ImgH < 1.3.

In some embodiments of the present application, an aperture value Fno of the optical imaging lens, a distance TD on the optical axis from the object-side surface of the first lens element to the image-side surface of the eighth lens element, and a distance TTL on the optical axis from the object-side surface of the first lens element to the image plane of the optical imaging lens satisfy: 1.25< TD/TTL × Fno < 1.35.

In some embodiments of the present application, a total effective focal length f of the optical imaging lens, an effective focal length f2 of the second lens, and a combined focal length f12 of the first lens and the second lens satisfy: f12/f-f2/f < 0.2.

In some embodiments of the present application, a radius of curvature R1 of the object side surface of the first lens, a radius of curvature R3 of the object side surface of the second lens, and a combined focal length f12 of the first and second lenses are satisfied: 0.7< (R1+ R3)/f12 <1.

In some embodiments of the present application, a radius of curvature R3 of an object-side surface of the second lens, a radius of curvature R4 of an image-side surface of the second lens, and an effective focal length f2 of the second lens satisfy: 3< f2/R3+ f2/R4< 5.

In some embodiments of the present application, a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy: 0.5< (R9+ R10)/(R9-R10) < 0.6.

In some embodiments of the present application, 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: 0.9< R11/R12< 1.

In some embodiments of the present application, a sum Σ CT of a center thickness CT1 of the first lens on the optical axis, a center thickness C5 of the fifth lens on the optical axis, and a center thickness Σ CT of each of the first to eighth lenses on the optical axis satisfies: 0.4< (CT1+ CT 5)/. Sigma CT < 0.5.

In some embodiments of the present application, a sum Σ AT of distances on the optical axis between each adjacent two lenses of the first to eighth lenses and a distance BFL on the optical axis between an image side surface of the eighth lens and an image forming surface satisfy: 0.5< ∑ AT/BFL <1.

In some embodiments of the present application, a distance BFL on the optical axis from an image-side surface of the eighth lens to an image-forming surface and a distance TD on the optical axis from an object-side surface of the first lens to the image-side surface of the eighth lens satisfy: 0.4< BFL/TD < 0.6.

In some embodiments of the present application, a sum Σ CT of center thicknesses on the optical axis of each of the first to eighth lenses and a sum Σ ET of edge thicknesses of each of the first to eighth lenses satisfy: 0.5< ∑ ET/Σ CT <1.

In some embodiments of the present application, the edge thicknesses ET5, ET6, and ET8 of the fifth, sixth, and eighth lenses satisfy: 1.5< ET5/ET6+ ET6/ET8< 2.5.

In some embodiments of the present application, an effective radius DT11 of an object-side surface of the first lens, an effective radius DT42 of an image-side surface of the fourth lens, and an effective radius DT82 of an image-side surface of the eighth lens satisfy: 0.5< DT11/DT 42-DT 42/DT82< 0.6.

The present application adopts a plurality of (for example, eight) lenses, and by reasonably distributing the focal power, the surface type, the center thickness of each lens, the distance of each lens on the optical axis, and the like, the volume of the optical imaging lens can be effectively reduced, the sensitivity of the optical imaging lens can be reduced, and the processability of the optical imaging lens can be improved, so that the optical imaging lens is more beneficial to production and processing and can be suitable for portable electronic products. The optical imaging lens according to the embodiment of the present application has a retractable feature in which the optical imaging lens is extendable when imaging and retractable when not imaging. In addition, the optical imaging lens has the characteristics of a large image plane, a long back focus and a large aperture, can ensure that enough luminous flux enters the optical lens during night shooting, and can realize larger shooting pictures and detail information so as to ensure high imaging quality of the shooting lens group.

Drawings

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

fig. 1 shows a schematic structural view of an optical imaging lens according to embodiment 1 of the present application;

fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 1;

fig. 3 is a schematic structural view showing an optical imaging lens according to embodiment 2 of the present application;

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

fig. 5 is a schematic structural view showing an optical imaging lens according to embodiment 3 of the present application;

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

fig. 7 is a schematic structural view showing an optical imaging lens according to embodiment 4 of the present application;

fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 4;

fig. 9 is a schematic structural view showing an optical imaging lens according to embodiment 5 of the present application;

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

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, in the present application, the embodiments and features of the embodiments 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.

The optical imaging lens according to an exemplary embodiment of the present application may include, for example, eight lenses having optical powers, i.e., 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. The eight lenses are arranged in order from an object side to an image side along an optical axis. In the first to eighth lenses, any adjacent two lenses may have an air space therebetween. The optical imaging lens may further include optical devices (not shown) for deflecting light rays, such as a deflecting prism and a mirror. As an example, the turning prism and the mirror may be disposed between the subject and the first lens.

In an exemplary embodiment, the optical imaging lens may further include at least one diaphragm. The stop may be provided at an appropriate position as needed to control the light-entering amount of the optical imaging lens, for example, between the object side and the first lens.

In an exemplary embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens, satisfies: ImgH >8mm, and an effective focal length f7 of the seventh lens and an effective focal length f8 of the eighth lens satisfy: -2< f7/f8< 0. The eight-piece lens adopts a compact combination, and can meet the optical performance and imaging effect of a large image plane and a long back focal length. Meanwhile, the focal power of each lens can be flexibly distributed by arranging the third lens in a meniscus shape with the concave surface facing the object side and the convex surface facing the image side and arranging the sixth lens in a meniscus shape, so that the optical performance is fully exerted.

In an exemplary embodiment, at least four lenses of the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens have negative power. Illustratively, the third lens, the fourth lens, the sixth lens and the eighth lens can respectively have negative focal power, and reasonable positive focal power and negative focal power configuration is performed on the lenses, so that aberration is balanced, and a high-resolution performance index is realized.

In an exemplary embodiment, the first lens may have a positive or negative power, and the object-side surface may be convex and the image-side surface may be concave; the second lens element can have a positive power, the object-side surface can be convex, the image-side surface can be concave, the third lens element can have a negative power, the object-side surface can be concave, the image-side surface can be convex, the fourth lens element can have a negative power, the object-side surface can be concave, the image-side surface can be concave, the fifth lens element can have a positive power, the object-side surface can be convex, the image-side surface can be convex, the sixth lens element can have a negative power, the object-side surface can be concave, and the image-side surface can be convex. The seventh lens element has positive power, and can have a concave object-side surface and a convex image-side surface. The eighth lens element can have a negative power, and can have a concave object-side surface and a convex image-side surface. The image pickup effect can be effectively improved by reasonably distributing the surface type and the focal power of each lens of the optical imaging lens.

In an exemplary embodiment, the half ImgH of the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens, the entrance pupil diameter EPD of the optical imaging lens, and the half Semi-FOV of the maximum field angle of the optical imaging lens satisfy: 0.7< EPD/(ImgH × tan (Semi-FOV) < 0.8. by reasonably setting the relationship between ImgH and the maximum field angle and the diameter of the entrance pupil value, the light convergence capability of the first lens is improved while the light entering amount of the optical system is improved, and the system can have the characteristic of a large field angle under the condition of long back focus.

In an exemplary embodiment, the distances on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens, between half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, half Semi-FOV of the maximum field angle of the optical imaging lens, and TTL, satisfy: 1.2< TTL × tan (Semi-FOV)/ImgH < 1.3. The condition formula can ensure that light rays entering the optical system are transmitted stably after being refracted through the lens, ensure reasonable distribution between lens TTL and back focal length and maintain the structural characteristics of long back focal length.

In an exemplary embodiment, an aperture value Fno of the optical imaging lens, a distance TD on the optical axis from the object-side surface of the first lens to the image-side surface of the eighth lens, and a distance TTL on the optical axis from the object-side surface of the first lens to the imaging surface of the optical imaging lens satisfy: 1.25< TD/TTL × Fno < 1.35. By constraining the relation between the TD and the TTL, the compactness of the TD size is ensured, and meanwhile, the optical characteristic of a large aperture can be achieved.

In an exemplary embodiment, the total effective focal length f of the optical imaging lens, the effective focal length f2 of the second lens and the combined focal length f12 of the first lens and the second lens satisfy: f12/f-f2/f < 0.2. The requirements of a large aperture and a large image plane of the optical system can be realized by reasonably distributing the total effective focal length of the system and the respective focal lengths of the first lens and the second lens.

In an exemplary embodiment, the radius of curvature of the object side surface of the first lens, R1, the radius of curvature of the object side surface of the second lens, R3, and the combined focal length of the first and second lenses, f12, satisfy: 0.7< (R1+ R3)/f12 <1. By properly configuring the radius of curvature of the object side surface and the combined focal length of the first lens and the second lens, the requirements of the long back focal optical system can be met by effectively controlling the shapes of the first lens and the second lens and reasonably distributing the optical power.

In an exemplary embodiment, the radius of curvature of the object-side surface of the second lens, R3, the radius of curvature of the image-side surface of the second lens, R4, and the effective focal length f2 of the second lens satisfy: 3< f2/R3+ f2/R4< 5. By restricting the relationship between the curvature and the focal length of the second lens and improving the focal power of the second lens, the sensitivity of the second lens can be reduced and the chromatic aberration of magnification of the system can be effectively reduced.

In an exemplary embodiment, a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy: 0.5< (R9+ R10)/(R9-R10) < 0.6. By constraining the relationship of the radii of curvature of the object-side surface and the image-side surface of the fifth lens, the sensitivity of the fifth lens can be reduced by improving the shape of the mirror plate, thereby reducing the ghost image intensity between the object-side surface and the image-side surface of the fifth lens and reducing the decentering sensitivity of the mirror plate of the fifth lens.

In an exemplary embodiment, 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: 0.9< R11/R12< 1. By restricting the shape of the lens of the sixth lens, the field curvature can be balanced to a certain degree, the vertical axis chromatic aberration of the system can be reduced, and meanwhile, the manufacturability of the sixth lens can be optimized.

In an exemplary embodiment, a sum Σ CT of a center thickness CT1 of the first lens on the optical axis, a center thickness C5 of the fifth lens on the optical axis, and a center thickness Σ CT of each of the first to eighth lenses on the optical axis satisfies: 0.4< (CT1+ CT 5)/. Sigma CT < 0.5. The relation of the central thickness of the first lens and the fifth lens and the sum of the central thicknesses of the thicknesses of all lenses of the system is restrained, so that the optimization of the balanced aberration is facilitated, the manufacturability of the lenses is improved, the processing difficulty is reduced, and the assembly stability of the system is improved.

In an exemplary embodiment, a sum Σ AT of distances on an optical axis of each adjacent two lenses of the first lens to the eighth lens and a distance BFL on the optical axis from an image side surface to an image forming surface of the eighth lens satisfy: 0.5< ∑ AT/BFL <1. The conditional expression can reduce the sensitivity of the first lens and effectively reduce the chromatic aberration of magnification of the system under the condition of maintaining the length of the back focus of the system.

In an exemplary embodiment, a distance BFL on the optical axis from an image-side surface of an eighth lens to an image-side surface and a distance TD on the optical axis from an object-side surface of the first lens to the image-side surface of the eighth lens satisfy: 0.4< BFL/TD < 0.6. The conditional expression can effectively control the length of the back coke of the system and realize the characteristic requirement of the long back coke.

In an exemplary embodiment, a sum Σ CT of center thicknesses on the optical axis of each of the first to eighth lenses and a sum Σ ET of edge thicknesses of each of the first to eighth lenses satisfy: 0.5< ∑ ET/Σ CT <1. The manufacturability of the lens can be ensured and the stability of the assembly is facilitated by constraining the relationship between the edge thickness and the center thickness of each lens of the system.

In an exemplary embodiment, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET8 of the eighth lens satisfy: 1.5< ET5/ET6+ ET6/ET8< 2.5. By constraining the edge thickness relationship of the fifth lens, the sixth lens and the eighth lens, the manufacturability of the lens can be improved, the sensitivity of the lens can be reduced, and the stability of assembly can be improved on the premise of optimizing and balancing aberration.

In an exemplary embodiment, an effective radius DT11 of an object side surface of the first lens, an effective radius DT42 of an image side surface of the fourth lens, and an effective radius DT82 of an image side surface of the eighth lens satisfy: 0.5< DT11/DT 42-DT 42/DT82< 0.6. The manufacturability of the lenses is in a processing range by controlling the central thickness among the first lens, the fourth lens and the eighth lens within a reasonable range, and meanwhile, the sensitivity of the thickness of the first lens and the fourth lens to field curvature can be reduced.

In an exemplary embodiment, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface.

The optical imaging lens adopts a plurality of (for example, eight) lenses, and by reasonably distributing the focal power, the surface type, the central thickness of each lens, the distance of each lens on an optical axis and the like, the volume of the optical imaging lens can be effectively reduced, the sensitivity of the optical imaging lens can be reduced, and the machinability of the optical imaging lens can be improved, so that the optical imaging lens is more beneficial to production and processing and can be suitable for portable electronic products. The optical imaging lens according to the embodiment of the present application has a retractable feature in which the optical imaging lens is extendable when imaging and retractable when not imaging. In addition, the optical imaging lens has the characteristics of a large image plane, a long back focus and a large aperture, can ensure that enough luminous flux enters the optical lens during night shooting, and can realize larger shooting pictures and detail information so as to ensure high imaging quality of the shooting lens group.

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 fourth 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 the object side surface and the image side surface of the first lens, the second lens, the third lens and the fourth lens is an aspheric mirror surface. Optionally, the object-side surface and the image-side surface of the second lens, the third lens and the fourth lens are aspheric mirror surfaces.

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

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

Example 1

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

As shown in fig. 1, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: the stop STO, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the image plane 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 positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a concave object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. The filter E9 has an object side S17 and an image side S18. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

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

TABLE 1

In this embodiment, the total effective focal length f of the optical imaging lens is 10.05mm, the distance TTL between the object-side surface S1 of the first lens and the imaging surface S19 on the optical axis is 12.31mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 8.30mm, the aperture value Fno of the optical imaging lens is 1.98, and the half Semi-FOV of the maximum field angle of the optical imaging lens is 39.14 °.

In the present embodiment, the aspheric surface type x included in the object-side surface and the image-side surface of the lenses of the first lens E1 to the eighth lens E8 may be defined using, but 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. Table 2 and Table 3 below show the coefficients A of the high-order terms that can be used for the aspherical mirror surfaces S1 to S16 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀、A₂₂、A₂₄、A₂₆And A₂₈。

Flour mark

A4

A6

A8

A10

A12

A14

S1

-3.9245E-02

5.8357E-02

-3.3869E-02

-1.0772E-02

1.4292E-02

8.4965E-03

S2

2.1887E-01

1.0635E-01

9.5690E-03

-3.4691E-03

4.3850E-03

-4.4681E-03

S3

3.3796E-02

1.9632E-01

-4.6107E-02

1.1237E-02

-5.9226E-03

-1.3233E-03

S4

-9.7551E-03

7.2795E-02

-4.3050E-02

1.8717E-02

-7.8281E-03

-1.6595E-03

S5

2.9989E-01

1.0651E-03

7.2114E-03

1.1692E-02

4.6841E-03

-6.4731E-03

S6

5.2919E-01

-3.0297E-02

3.2179E-02

-7.3876E-05

6.0210E-03

-5.5219E-03

S7

6.7845E-01

-5.7318E-02

3.6626E-03

-1.7652E-02

1.1699E-03

-4.0691E-03

S8

2.8979E-02

7.3869E-03

-2.9561E-02

-2.8769E-03

-2.6648E-03

3.0930E-03

S9

-2.0413E-01

2.7212E-03

-8.9368E-03

-2.0899E-02

2.2326E-02

8.9942E-03

S10

-5.1983E-01

1.9924E-01

-5.1747E-03

9.1533E-03

1.9971E-02

-1.3072E-02

S11

-4.6609E-01

-2.9959E-01

1.1268E-01

-3.4654E-02

-1.4523E-02

4.3120E-03

S12

-7.1143E-01

-1.5723E-01

2.4149E-01

-1.4190E-01

3.9155E-02

3.2692E-03

S13

5.6574E-01

7.9047E-01

2.7346E-01

-2.5899E-01

-2.8700E-03

8.1724E-02

S14

-5.5020E-01

-1.0966E-01

3.9175E-01

1.6580E-02

-4.1234E-02

-8.2116E-02

S15

-1.5080E+00

-2.9828E-01

3.1099E-01

3.5325E-01

1.9773E-01

4.1629E-02

S16

1.2637E+00

6.3986E-01

9.4524E-02

1.7755E-01

1.2179E-01

4.8522E-02

TABLE 2

TABLE 3

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

Example 2

An optical imaging lens 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 parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application.

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

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a concave object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. 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 embodiment, the total effective focal length f of the optical imaging lens is 9.99mm, the distance TTL between the object-side surface S1 of the first lens and the imaging surface S19 on the optical axis is 12.31mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 8.27mm, the aperture value Fno of the optical imaging lens is 1.98, and the half Semi-FOV of the maximum field angle of the optical imaging lens is 39.07 °.

Table 4 shows a basic parameter table of the optical imaging lens of embodiment 2, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm). Tables 5 and 6 show 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 formula (1) given in example 1 above.

TABLE 4

Flour mark

A4

A6

A8

A10

A12

A14

S1

-7.4465E-02

4.2816E-02

-2.6070E-02

-3.1636E-03

8.6120E-03

3.3688E-03

S2

1.9309E-01

8.8022E-02

2.0249E-02

9.6092E-03

1.8432E-03

-1.2235E-03

S3

4.8148E-02

1.8510E-01

-4.0435E-02

1.5630E-02

-7.1203E-03

1.4357E-03

S4

-4.8436E-03

7.0165E-02

-4.5613E-02

1.2664E-02

-8.0833E-03

7.4640E-04

S5

2.7131E-01

-4.0211E-03

8.1303E-03

8.5099E-03

9.4703E-04

-3.2421E-03

S6

4.8990E-01

-3.3917E-02

2.5034E-02

-8.7141E-04

4.0834E-03

-4.9041E-03

S7

6.2164E-01

-6.4087E-02

6.1699E-03

-1.1774E-02

2.5640E-03

-3.1957E-03

S8

3.6536E-02

8.1708E-03

-2.1031E-02

-1.2766E-03

-1.2357E-03

1.6833E-03

S9

-1.9334E-01

6.7135E-03

1.2664E-03

-1.2844E-02

1.6838E-02

2.0485E-03

S10

-4.7508E-01

1.9606E-01

-3.7612E-03

4.2843E-03

1.0295E-02

-1.2000E-02

S11

-4.1666E-01

-2.7300E-01

1.1349E-01

-3.8351E-02

-1.9365E-02

6.5831E-03

S12

-6.3155E-01

-1.3743E-01

2.1233E-01

-1.4020E-01

4.7346E-02

-4.8263E-03

S13

5.9239E-01

7.2695E-01

2.4111E-01

-2.2676E-01

5.5906E-03

6.2895E-02

S14

-5.0990E-01

-4.7573E-02

3.4483E-01

-2.9261E-02

-3.0020E-02

-5.5824E-02

S15

-1.2734E+00

-1.5459E-01

2.6591E-01

2.6133E-01

1.3675E-01

3.2102E-02

S16

1.5111E+00

5.1939E-01

1.0799E-01

1.7337E-01

1.0682E-01

4.4412E-02

TABLE 5

TABLE 6

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

Example 3

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

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

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

In the present embodiment, the total effective focal length f of the optical imaging lens is 10.01mm, the distance TTL between the object-side surface S1 of the first lens and the imaging surface S19 on the optical axis is 12.33mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 8.27mm, the aperture value Fno of the optical imaging lens is 1.98, and the half Semi-FOV of the maximum field angle of the optical imaging lens is 39.00 °.

Table 7 shows a basic parameter table of the optical 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 8 and 9 show high-order term coefficients that can be used for each aspherical mirror surface in embodiment 3, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

S1

-7.5517E-02

4.2454E-02

-2.5732E-02

-3.0485E-03

8.4493E-03

3.2208E-03

S2

1.9238E-01

8.7701E-02

2.0858E-02

9.8772E-03

1.9746E-03

-9.7597E-04

S3

4.8490E-02

1.8526E-01

-3.9659E-02

1.5495E-02

-6.6820E-03

1.4203E-03

S4

-4.0508E-03

7.0548E-02

-4.5911E-02

1.2647E-02

-8.0280E-03

8.4029E-04

S5

2.7137E-01

-3.9485E-03

7.9522E-03

8.2637E-03

1.2059E-03

-3.5382E-03

S6

4.9005E-01

-3.4310E-02

2.4466E-02

-6.1833E-04

4.1238E-03

-5.1703E-03

S7

6.2078E-01

-6.4458E-02

6.1437E-03

-1.2118E-02

2.9138E-03

-3.4638E-03

S8

3.7288E-02

8.5156E-03

-2.1109E-02

-1.1979E-03

-1.2540E-03

1.7934E-03

S9

-1.9229E-01

7.2298E-03

1.8140E-03

-1.3370E-02

1.6975E-02

2.9421E-03

S10

-4.7414E-01

1.9645E-01

-3.3209E-03

5.3398E-03

9.7553E-03

-1.2146E-02

S11

-4.1570E-01

-2.7251E-01

1.1370E-01

-3.8354E-02

-1.9602E-02

6.0127E-03

S12

-6.3046E-01

-1.3748E-01

2.1256E-01

-1.4063E-01

4.6804E-02

-5.2352E-03

S13

5.9150E-01

7.2589E-01

2.4141E-01

-2.2565E-01

6.0732E-03

6.2510E-02

S14

-5.0433E-01

-4.2959E-02

3.4355E-01

-3.0203E-02

-3.0146E-02

-5.5186E-02

S15

-1.2828E+00

-1.5416E-01

2.6331E-01

2.5714E-01

1.3255E-01

3.2929E-02

S16

1.5149E+00

5.1515E-01

1.0414E-01

1.6975E-01

1.0650E-01

4.0926E-02

TABLE 8

TABLE 9

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

Example 4

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

As shown in fig. 7, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: the stop STO, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the image plane 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 positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a concave object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this embodiment, the total effective focal length f of the optical imaging lens is 9.93mm, the distance TTL between the object-side surface S1 of the first lens and the imaging surface S19 on the optical axis is 12.31mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 8.27mm, the aperture value Fno of the optical imaging lens is 1.98, and the half Semi-FOV of the maximum field angle of the optical imaging lens is 39.15 °.

Table 10 shows a basic parameter table of the optical 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 11 and 12 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.

Watch 10

Flour mark

A4

A6

A8

A10

A12

A14

S1

-8.3034E-02

3.9665E-02

-2.3130E-02

2.4208E-04

6.2364E-03

1.2424E-03

S2

1.9061E-01

8.7401E-02

1.8676E-02

7.8790E-03

2.0578E-03

-1.6235E-03

S3

6.7880E-02

1.8874E-01

-3.9292E-02

1.3056E-02

-7.0258E-03

2.0651E-03

S4

-8.3109E-04

7.1257E-02

-4.6157E-02

1.2940E-02

-7.6448E-03

1.0416E-03

S5

2.7071E-01

-4.2672E-03

6.6772E-03

8.0911E-03

2.6596E-03

-3.8628E-03

S6

4.9094E-01

-3.5365E-02

2.3259E-02

-2.2545E-03

6.5536E-03

-5.6297E-03

S7

6.1579E-01

-6.8233E-02

1.6208E-03

-1.2482E-02

5.3567E-03

-4.7816E-03

S8

4.2887E-02

9.0233E-03

-2.1984E-02

-5.8839E-04

-1.6429E-03

1.7182E-03

S9

-1.8571E-01

1.5242E-02

1.2076E-02

-9.5236E-03

1.6560E-02

1.0932E-03

S10

-4.6512E-01

2.0206E-01

3.5007E-03

6.2566E-03

3.7942E-03

-1.1217E-02

S11

-3.9850E-01

-2.6381E-01

1.1719E-01

-4.0165E-02

-2.2717E-02

2.3177E-03

S12

-6.1760E-01

-1.4056E-01

2.0917E-01

-1.4250E-01

4.3008E-02

-5.2054E-03

S13

5.3704E-01

7.0476E-01

2.3914E-01

-2.1696E-01

1.2003E-02

6.0929E-02

S14

-5.2374E-01

-4.1517E-02

3.4418E-01

-3.8833E-02

-2.3112E-02

-3.9178E-02

S15

-1.1371E+00

-1.8160E-01

3.0819E-01

1.8644E-01

7.6719E-02

4.6746E-02

S16

1.5431E+00

4.6402E-01

6.4912E-02

1.4779E-01

9.0022E-02

3.7297E-02

TABLE 11

TABLE 12

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

Example 5

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

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

In this embodiment, the total effective focal length f of the optical imaging lens is 10.18mm, the distance TTL on the optical axis from the object side surface S1 to the image plane S19 of the first lens element is 12.46mm, the ImgH of the half diagonal length of the effective pixel area on the image plane S19 is 8.27mm, the aperture value Fno of the optical imaging lens is 1.98, and the half Semi-FOV of the maximum field angle of the optical imaging lens is 38.56 °.

Table 13 shows a basic parameter table of the optical 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 14 and 15 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.

Watch 13

Flour mark

A4

A6

A8

A10

A12

A14

S1

-4.2908E-02

5.7613E-02

-3.3140E-02

-1.0552E-02

1.3843E-02

8.1468E-03

S2

2.1605E-01

1.0732E-01

8.6719E-03

3.5691E-04

5.7859E-03

-6.2484E-03

S3

3.6879E-02

1.9505E-01

-4.5268E-02

1.1694E-02

-2.6638E-03

-3.1701E-03

S4

-3.0495E-03

7.2907E-02

-4.6781E-02

1.8925E-02

-6.6094E-03

-1.5055E-03

S5

2.9906E-01

1.0035E-03

6.7897E-03

8.7017E-03

6.1028E-03

-5.2151E-03

S6

5.2556E-01

-3.2659E-02

3.1524E-02

-1.1922E-03

6.5331E-03

-3.0919E-03

S7

6.7555E-01

-5.9055E-02

3.5965E-03

-1.4866E-02

1.4314E-03

-4.8734E-03

S8

3.3490E-02

7.1845E-03

-2.9847E-02

-2.0810E-03

-3.7782E-03

3.3773E-03

S9

-2.0540E-01

4.0071E-03

-6.8268E-03

-2.0449E-02

1.9368E-02

7.5794E-03

S10

-5.1638E-01

2.0149E-01

-4.7758E-03

8.3129E-03

2.1431E-02

-1.1742E-02

S11

-4.6664E-01

-2.9944E-01

1.1517E-01

-3.1078E-02

-1.1567E-02

5.6613E-03

S12

-7.1047E-01

-1.5397E-01

2.4300E-01

-1.4052E-01

4.1856E-02

2.7991E-03

S13

5.9653E-01

7.9694E-01

2.6991E-01

-2.5942E-01

-3.5786E-03

7.9910E-02

S14

-5.0864E-01

-1.1625E-01

3.7827E-01

6.2553E-03

-4.3721E-02

-7.5007E-02

S15

-1.4905E+00

-2.9637E-01

3.0686E-01

3.4132E-01

1.8349E-01

4.1068E-02

S16

1.2291E+00

6.4634E-01

7.6182E-02

1.6852E-01

1.2210E-01

3.6554E-02

TABLE 14

Watch 15

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens according to embodiment 6 can achieve good imaging quality.

In summary, examples 1 to 5 satisfy the relationship shown in table 16, respectively.

Conditions/examples	1	2	3	4	5
						f7/f8	-0.97	-1.01	-1.01	-1.08	-0.97
EPD/(ImgH*tan(Semi-FOV)	0.75	0.75	0.76	0.75	0.78
						TTL*tan(Semi-FOV)/ImgH	1.21	1.21	1.21	1.21	1.20
TD/TTL*fno	1.31	1.31	1.31	1.32	1.29
						f12/f-f2/f	0.01	0.15	0.16	0.08	0.05
(R1+R3)/f12	0.95	0.81	0.80	0.79	0.90
						f2/R3+f2/R4	3.06	3.66	3.70	4.15	3.20
(R9+R10)/(R9-R10)	0.53	0.57	0.56	0.55	0.53
						R11/R12	0.94	0.94	0.94	0.95	0.95
(CT1+CT5)/∑CT	0.41	0.44	0.44	0.44	0.41
						∑AT/BFL	0.61	0.68	0.68	0.70	0.59
BFL/TD	0.51	0.51	0.51	0.49	0.53
						∑ET/∑CT	0.75	0.75	0.74	0.79	0.75
ET5/ET6+ET6/ET8	1.83	2.03	2.19	1.55	1.83
						DT11/DT42-DT42/DT82	0.54	0.56	0.56	0.51	0.54

TABLE 16

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 an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

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 a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. 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 optical imaging lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens each having a refractive power,

the second lens has positive optical power;

the third lens is in a meniscus shape convex to the image side;

the sixth lens has a meniscus shape; and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens meets the following conditions: ImgH >8mm, and an effective focal length f7 of the seventh lens and an effective focal length f8 of the eighth lens satisfy: -2< f7/f8< 0.

2. The optical imaging lens of claim 1, wherein at least four lenses of the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens have negative optical power.

3. The optical imaging lens of claim 1, wherein the half of diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging lens, the entrance pupil diameter EPD of the optical imaging lens, and the half of maximum field angle Semi-FOV of the optical imaging lens satisfy: 0.7< EPD/(ImgH × tan (Semi-FOV) < 0.8.

4. The optical imaging lens of claim 1, wherein the distances between half ImgH of diagonal length of effective pixel area on the imaging surface of the optical imaging lens, half Semi-FOV of maximum field angle of the optical imaging lens, and TTL of the distance from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis satisfy: 1.2< TTL × tan (Semi-FOV)/ImgH < 1.3.

5. The optical imaging lens of claim 1, wherein an aperture value Fno of the optical imaging lens, a distance TD on the optical axis from an object side surface of the first lens to an image side surface of the eighth lens, and a distance TTL on the optical axis from the object side surface of the first lens to an image plane of the optical imaging lens satisfy: 1.25< TD/TTL × Fno < 1.35.

6. The optical imaging lens of claim 1, wherein a total effective focal length f of the optical imaging lens, an effective focal length f2 of the second lens, and a combined focal length f12 of the first and second lenses satisfy: f12/f-f2/f < 0.2.

7. The optical imaging lens of claim 1, wherein a radius of curvature R1 of the object side surface of the first lens, a radius of curvature R3 of the object side surface of the second lens, and a combined focal length f12 of the first and second lenses satisfy:

0.7<(R1+R3)/f12<1。

8. the optical imaging lens of claim 1, wherein a radius of curvature of an object-side surface R3 of the second lens, a radius of curvature of an image-side surface R4 of the second lens, and an effective focal length f2 of the second lens satisfy: 3< f2/R3+ f2/R4< 5.

9. The optical imaging lens of claim 1, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy: 0.5< (R9+ R10)/(R9-R10) < 0.6.

10. The optical imaging lens of claim 1, wherein 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: 0.9< R11/R12< 1.