CN114647062B

CN114647062B - Optical imaging lens

Info

Publication number: CN114647062B
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: 2023-12-01
Anticipated expiration: 2042-03-25
Also published as: CN114647062A

Abstract

The application provides an optical imaging lens, which sequentially comprises the following components 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 optical power, wherein the second lens has positive optical power; the third lens is in a meniscus shape protruding to the image side; the sixth lens has a meniscus shape; and half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, imgH, satisfies: imgH >8mm, and the effective focal length f7 of the seventh lens and the effective focal length 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

Along with the progress of science and technology, electronic products such as smart phones rapidly develop, and imaging requirements of people for photographing the smart phones are also continuously improved. Currently, the imaging lens mounted on electronic products such as mobile phones is not limited to a single camera, but gradually develops into multiple cameras, and most high-end lenses use a combination mode of wide-angle extended focal length to realize an optical zoom function.

However, the simple zooming function cannot meet the shooting requirement of people on large image surfaces and high imaging quality. The large image plane and the large aperture lens are increasingly popular with users because they can collect more light information, have smaller optical aberration and better imaging quality, and offer users the possibility of independently selecting the aperture size. In order to obtain a larger imaging surface, a higher optical lens is often required, but the overall height of the mobile phone is limited, and the height of the optical lens is difficult to further increase.

Disclosure of Invention

An aspect of the present application provides an optical imaging lens sequentially including, 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 optical power, wherein the second lens has positive optical power; the third lens is in a meniscus shape protruding to the image side; the sixth lens has a meniscus shape; and half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens is as follows: imgH >8mm, and the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: -2< f7/f8<0.

In some embodiments of the application, at least four 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, a half of a diagonal length ImgH of an effective pixel region on an imaging surface of the optical imaging lens, an entrance pupil diameter EPD of the optical imaging lens, and a half of a maximum field angle Semi-FOV of the optical imaging lens satisfy: 0.7< EPD/(ImgH×tan (Semi-FOV) <0.8.

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

In some embodiments of the present application, the aperture value Fno of the optical imaging lens, the 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 the 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 x FNo <1.35.

In some embodiments of the present application, 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.

In some embodiments of the present application, the radius of curvature R1 of the object side of the first lens, the radius of curvature R3 of the object side of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy: 0.7< (R1+R3)/f 12<1.

In some embodiments of the present application, a radius of curvature R3 of the object side surface of the second lens, a radius of curvature R4 of the 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 the object-side surface of the fifth lens element and a radius of curvature R10 of the image-side surface of the fifth lens element satisfy: 0.5< (R9+R10)/(R9-R10) <0.6.

In some embodiments of the present application, a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.9< R11/R12<1.

In some embodiments of the present application, a sum Σct 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 center thicknesses of the respective lenses of the first lens to the eighth lens on the optical axis satisfies: 0.4< (CT1+CT5)/(Sigma CT < 0.5).

In some embodiments of the present application, a sum Σat of distances on an optical axis between each adjacent two lenses of the first lens element to the eighth lens element and a distance BFL on the optical axis between an image side surface to an imaging surface of the eighth lens element satisfies: 0.5< ΣAT/BFL <1.

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

In some embodiments of the present application, a sum Σct of center thicknesses of the respective lenses of the first to eighth lenses on the optical axis and a sum Σet of edge thicknesses of the respective lenses of the first to eighth lenses satisfy: 0.5< ΣET/ΣCT <1.

In some embodiments of the present application, 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.

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

The application adopts a plurality of (e.g. 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, the processability of the optical imaging lens can be improved, and 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 application has the characteristic of being telescopic, namely, the optical imaging lens can be extended when imaging and the optical imaging lens can be retracted when not imaging. In addition, the optical imaging lens provided by the embodiment of the application has the characteristics of large image surface, long back focus and large aperture, can ensure that enough luminous flux enters the optical lens in night shooting, can realize larger shooting pictures and detailed information, and ensures 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, taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 shows a schematic configuration diagram 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 magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 1;

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

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

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

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

fig. 7 shows a schematic configuration diagram of 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 magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 4;

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

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

Detailed Description

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

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

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

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

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

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

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

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

The optical imaging lens according to the exemplary embodiment of the present application may include, for example, eight lenses having optical power, 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 the object side to the image side along the optical axis. In the first lens to the eighth lens, any adjacent two lenses may have an air space therebetween. The optical imaging lens may further include optics (not shown) for turning the light, such as turning prisms and mirrors. As an example, a turning prism and a reflecting 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 diaphragm may be disposed at a proper position as needed to control the light entering amount of the optical imaging lens, for example, disposed between the object side and the first lens.

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

In an exemplary embodiment, at least four lenses of the first, third, fourth, fifth, sixth, seventh and eighth lenses have negative optical power. Illustratively, the third lens, the fourth lens, the sixth lens and the eighth lens may have negative optical power, respectively, which is advantageous for balancing aberrations by reasonably configuring the lenses with positive optical power and negative optical power, and realizing performance indexes of high resolution.

In an exemplary embodiment, the first lens may have positive or negative optical power, the object-side surface thereof may be convex, and the image-side surface thereof may be concave; the second lens element may have positive refractive power, the object-side surface thereof may be concave, the image-side surface thereof may have negative refractive power, the object-side surface thereof may be concave, the image-side surface thereof may be convex, the fourth lens element may have negative refractive power, the object-side surface thereof may be concave, the image-side surface thereof may be concave, the fifth lens element may have positive refractive power, the object-side surface thereof may be convex, the image-side surface thereof may be convex, the sixth lens element may have negative refractive power, the object-side surface thereof may be concave, and the image-side surface thereof may be convex. The seventh lens element has positive refractive power, wherein an object-side surface thereof may be concave and an image-side surface thereof may be convex. The eighth lens element may have negative refractive power, wherein the object-side surface thereof may be concave and the image-side surface thereof may be convex. The imaging 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 of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens, the entrance pupil diameter EPD of the optical imaging lens, and the half of the maximum field angle Semi-FOV 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 angle of view and entrance pupil diameter, the light convergence capability of the first lens is improved while the light entering amount of the optical system is improved, so that the system can have the characteristic of large angle of view under the condition of long back focus.

In an exemplary embodiment, a distance TTL between a half of a diagonal line length of an effective pixel area on an imaging surface of the optical imaging lens, a half of a maximum field angle of the optical imaging lens and an object side surface of the first lens to the imaging surface of the optical imaging lens on an optical axis satisfies: 1.2< TTL×tan (Semi-FOV)/ImgH <1.3. The above condition can ensure the stable transmission of the light rays entering the optical system after being refracted by the lens, ensure the reasonable distribution between the lens TTL and the length of the back focus, and maintain the structural characteristics of the long back focus.

In an exemplary embodiment, the aperture value Fno of the optical imaging lens, the distance TD on the optical axis between the object side surface of the first lens and the image side surface of the eighth lens, and the distance TTL on the optical axis between the object side surface of the first lens and the imaging surface of the optical imaging lens satisfy: 1.25< TD/TTL x FNo <1.35. By restricting the relationship between TD and TTL, the compactness of 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 large aperture and large image surface of the optical system can be realized by reasonably distributing the total effective focal length of the system and the focal lengths of the first lens and the second lens.

In an exemplary embodiment, the radius of curvature R1 of the object side of the first lens, the radius of curvature R3 of the object side of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy: 0.7< (R1+R3)/f 12<1. Through the reasonably configured curvature radius of the object side surface and the combined focal length of the first lens and the second lens, the requirements of the optical system with long back focus can be met by effectively controlling the shapes of the first lens and the second lens and reasonably distributing the focal power.

In an exemplary embodiment, the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, 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 focal length of the second lens, improving the optical power of the second lens can reduce the sensitivity of the second lens and effectively reduce chromatic aberration of magnification of the system.

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

In an exemplary embodiment, 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 satisfy: 0.9< R11/R12<1. By constraining the lens shape of the sixth lens, the curvature of field can be balanced to some extent and the vertical chromatic aberration of the system can be reduced, while being beneficial to optimizing manufacturability of the sixth lens.

In an exemplary embodiment, a sum Σct 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 center thicknesses of the respective lenses of the first lens to the eighth lens on the optical axis satisfies: 0.4< (CT1+CT5)/(Sigma CT < 0.5). The relation between the center thicknesses of the first lens and the fifth lens and the sum of the center thicknesses of the thicknesses of all lenses of the system is restrained, so that the balance aberration is optimized, 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 Σat 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 of an image side surface to an imaging surface of the eighth lens satisfy: 0.5< ΣAT/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 the image side surface of the eighth lens to the imaging surface and 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 satisfy: 0.4< BFL/TD <0.6. The conditional expression can effectively control the length of the back focus of the system and realize the characteristic requirement of the long back focus.

In an exemplary embodiment, a sum Σct of center thicknesses of respective lenses of the first lens to the eighth lens on the optical axis and a sum Σet of edge thicknesses of respective lenses of the first lens to the eighth lens satisfy: 0.5< ΣET/ΣCT <1. Through the relation between the edge thickness and the center thickness of each lens of the restraint system, the manufacturability of the lens can be ensured, and the assembly stability is facilitated.

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 restraining the edge thickness relation 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, the effective radius DT11 of the object side surface of the first lens, the effective radius DT42 of the image side surface of the fourth lens, and the effective radius DT82 of the image side surface of the eighth lens satisfy: 0.5< DT11/DT42-DT42/DT82<0.6. The thickness of the center among the first lens, the fourth lens and the eighth lens is controlled within a reasonable range, so that manufacturability of the lenses is in a processable range, and 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 the imaging surface.

In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface of the first lens to the image side surface of the fourth lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of 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 aspherical mirror surface. Optionally, the object side surface and the image side surface of the second lens element, the third lens element and the fourth lens element are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the technical solution claimed in the present application. For example, although eight lenses are described as an example 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 the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying 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 configuration diagram of an optical imaging lens according to embodiment 1 of the present application.

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

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is concave and an image-side surface S16 thereof is convex. The filter E9 has an object side surface S17 and an image side surface S18. 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 the basic parameter table of the optical imaging lens of embodiment 1, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all 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 of the diagonal length ImgH 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 of the maximum field angle Semi-FOV of the optical imaging lens is 39.14 °.

In the present embodiment, the aspherical surface profile x included in the object side surface and the image side surface of the lens in the first lens E1 to the eighth lens E8 can be defined by, but not limited to, the following aspherical surface formulae:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the table above1, the inverse of the radius of curvature R); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Tables 2 and 3 below show the higher order coefficients A that can be used for each of the aspherical mirrors S1 to S16 in example 1 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ And A ₂₀ 、A ₂₂ 、A ₂₄ 、A ₂₆ And A ₂₈ 。

Face number

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 Table 3

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which indicates the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve of the optical imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. 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 magnification chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the 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 provided in 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 portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration of an optical imaging lens according to embodiment 2 of the present application.

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

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

In this embodiment, the total effective focal length f of the optical imaging lens is 9.99mm, the distance TTL from the object side surface S1 of the first lens to the imaging surface S19 on the optical axis is 12.31mm, the half of the diagonal length ImgH 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 of the maximum field angle Semi-FOV of the optical imaging lens is 39.07 °.

Table 4 shows the basic parameter table of the optical imaging lens of embodiment 2, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm). Tables 5 and 6 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 4 Table 4

Face number

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 indicates the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve of the optical imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. 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 magnification chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the optical imaging lens provided in 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 configuration diagram of an optical imaging lens according to embodiment 3 of the present application.

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

In this 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 of the diagonal length ImgH 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 of the maximum field angle Semi-FOV 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 radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 8 and 9 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 7

Face number

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 an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which indicates the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the optical imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. 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 magnification chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the 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 provided in 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 configuration diagram of an optical imaging lens according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging lens sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane 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 of the diagonal length ImgH 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 of the maximum field angle Semi-FOV of the optical imaging lens is 39.15 °.

Table 10 shows a basic parameter table of the optical imaging lens of example 4, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 11 and 12 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

Table 10

Face number

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 indicates the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve of the optical imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. 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 magnification chromatic aberration 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 provided in 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 configuration of an optical imaging lens according to embodiment 5 of the present application.

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

In this embodiment, the total effective focal length f of the optical imaging lens is 10.18mm, the distance TTL between the object side surface S1 of the first lens and the imaging surface S19 on the optical axis is 12.46mm, the half of the diagonal length ImgH 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 of the maximum field angle Semi-FOV 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 radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 14 and 15 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 13

Face number

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

TABLE 15

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which indicates the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve of the optical imaging lens of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. 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 magnification chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens provided in embodiment 6 can achieve good imaging quality.

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

Condition/example	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 image forming apparatus, wherein the electron photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (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 cell phone. The imaging device is equipped with the optical imaging lens described above.

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

Claims

1. The 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 optical power, characterized in that,

the second lens has positive optical power;

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

the fifth lens has positive optical power;

the sixth lens has negative focal power and is in a meniscus shape protruding to the image side;

the seventh lens has positive optical power;

the eighth lens has negative focal power;

the number of lenses with optical power in the optical imaging lens is eight; and

half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens is ImgH: imgH >8mm, and the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: -2< f7/f8<0.

2. The optical imaging lens according to claim 1, wherein at least four 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 according to claim 1, wherein a half of a diagonal length ImgH of an effective pixel region on an imaging surface of the optical imaging lens, an entrance pupil diameter EPD of the optical imaging lens, and a half of a 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 according to claim 1, wherein a distance TTL between a half of a diagonal length ImgH of an effective pixel region on an imaging surface of the optical imaging lens, a half of a maximum field angle Semi-FOV of the optical imaging lens, and an object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis satisfies: 1.2< TTL×tan (Semi-FOV)/ImgH <1.3.

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

6. The optical imaging lens according to 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 lens and the second lens satisfy: f12/f-f2/f <0.2.

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

0.7<(R1+R3)/f12<1。

8. the optical imaging lens according to claim 1, wherein 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.

9. The optical imaging lens according to 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 according to 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.

11. The optical imaging lens according to claim 1, wherein a sum Σct 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 Σct of each of the first to eighth lenses on the optical axis satisfies: 0.4< (CT1+CT5)/(Sigma CT < 0.5).

12. The optical imaging lens according to claim 1, wherein a sum Σat 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 of an image side surface to an imaging surface of the eighth lens satisfy: 0.5< ΣAT/BFL <1.

13. The optical imaging lens according to claim 1, wherein a distance BFL on the optical axis from an image side surface of the eighth lens to an imaging surface and 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 satisfy: 0.4< BFL/TD <0.6.

14. The optical imaging lens according to claim 1, wherein a sum Σct of center thicknesses of respective lenses of the first to eighth lenses on the optical axis and a sum Σet of edge thicknesses of respective lenses of the first to eighth lenses satisfy: 0.5< ΣET/ΣCT <1.

15. The optical imaging lens according to claim 1, wherein between an edge thickness ET5 of the fifth lens, an edge thickness ET6 of the sixth lens, and an edge thickness ET8 of the eighth lens,: 1.5< ET5/ET6+ET6/ET8<2.5.

16. The optical imaging lens according to claim 1, wherein 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/DT42-DT42/DT82<0.6.