CN210776000U

CN210776000U - Optical imaging lens

Info

Publication number: CN210776000U
Application number: CN201921627387.8U
Authority: CN
Inventors: 吕赛锋; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-06-16
Anticipated expiration: 2029-09-27

Abstract

The application discloses an optical imaging lens, which sequentially comprises a first lens with focal power from an object side to an image side along an optical axis; a second lens having a positive optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having optical power; and an eighth lens having a negative optical power. Wherein, the distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis, the entrance pupil diameter EPD of the optical imaging lens and the effective image on the imaging surface of the optical imaging lensThe ImgH of half the diagonal length of the pixel region satisfies: TTL/(EPD is multiplied by ImgH)<0.5mm^‑1And the total effective focal length f of the optical imaging lens, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -2.0<f/R8+f/R9<0。

Description

Optical imaging lens

Technical Field

The present disclosure relates to an optical imaging lens, and more particularly, to an optical imaging lens including eight lenses.

Background

Along with the rapid development of communication technology in recent years, the replacement frequency of smart phones is more frequent. Each terminal manufacturer focuses on the mobile phone photographing function and continuously puts forward new requirements for the imaging system. On the one hand, the market requires the imaging lens in the mobile phone to be light and thin so as to adapt to the development trend of ultra-thin mobile phones. On the other hand, the imaging lens is required to have the characteristics of large aperture and large image plane, so that the smart phone is suitable for the shooting requirements under different environments of long-range view and close-range view.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging lens applicable to portable electronic products that may solve, at least, or in part, at least one of the above-mentioned disadvantages of the related art.

An aspect of the present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having an optical power; a second lens having a positive optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having optical power; and an eighth lens having a negative optical power.

In one embodiment, 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, the entrance pupil diameter EPD of the optical imaging lens, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens satisfy: TTL/(EPD is multiplied by ImgH)<0.5mm^-1。

In one embodiment, the total effective focal length f of the optical imaging lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the radius of curvature R9 of the object-side surface of the fifth lens satisfy: -2.0< f/R8+ f/R9< 0.

In one embodiment, a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens satisfy: -1.0< R7/R8< 0.

In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens satisfy: f4/f3< -1.5.

In one embodiment, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: -1.5< f7/f8< 0.

In one embodiment, the total effective focal length f of the optical imaging lens satisfies, with the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R1 of the object-side surface of the first lens: f/(R2-R1) is not less than 5.0.

In one embodiment, the total effective focal length f of the optical imaging lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0< f/R4< 0.5.

In one embodiment, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 0< (R4-R5)/(R4+ R5) is less than or equal to 1.0.

In one embodiment, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: -2.0< (R6+ R7)/(R6-R7) < -1.0.

In one embodiment, the total effective focal length f of the optical imaging lens and the central thickness CT1 of the first lens on the optical axis satisfy: f/CT1 is more than or equal to 6.0 and less than or equal to 10.

In one embodiment, the effective focal length f2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy: 6< f2/CT2< 15.

In one embodiment, the total effective focal length f of the optical imaging lens, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: 0.5 ≦ f/| f5| + f/| f6| < 1.0.

In one embodiment, the distance T34 between the third lens and the fourth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: T34/CT4 is more than or equal to 1 and less than or equal to 2.

In one embodiment, the central thickness CT5 of the fifth lens on the optical axis is separated from the fourth lens and the fifth lens on the optical axis by a distance T45 that satisfies: 1 is less than or equal to CT5/T45< 5.

In one embodiment, a central thickness CT6 of the sixth lens on the optical axis, a central thickness CT7 of the seventh lens on the optical axis, and a central thickness CT8 of the eighth lens on the optical axis satisfy: 0.45mm < (CT6+ CT7+ CT8)/3<0.6 mm.

In one embodiment, the abbe number V6 of the sixth lens and the abbe number V7 of the seventh lens satisfy: V6/V7 is more than or equal to 0.5 and less than 2.0.

In one embodiment, abbe number V4 of the fourth lens, abbe number V5 of the fifth lens and abbe number V6 of the sixth lens satisfy: V4-V5I/V6 is more than or equal to 1 and less than 1.5.

The optical imaging lens provided by the application comprises a plurality of lenses, such as a first lens to an eighth lens. The mutual relation between the total effective focal length of the optical imaging lens and the maximum field angle of the optical imaging lens is reasonably set, the focal power and the surface type of each lens are optimized, and the optical imaging lens is reasonably matched with each other, so that the optical imaging lens is miniaturized, light and thin and has a large imaging surface.

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 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 2;

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 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 3;

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 astigmatism 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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

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

An optical imaging lens according to an exemplary embodiment of the present application may include 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. Each adjacent lens may have an air space therebetween.

In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a positive optical power; the third lens has negative focal power; the fourth lens has positive focal power; the fifth lens has positive focal power or negative focal power; the sixth lens has positive focal power or negative focal power; the seventh lens may have positive or negative optical power; and the eighth lens may have a negative optical power. The focal power of the optical system is reasonably distributed, the excessive concentration of the focal power is avoided, the aberration of the optical system is effectively balanced, and the imaging quality is improved. Through the reasonable distribution of the positive and negative focal powers of the second lens and the third lens, the low-order aberration of the system can be effectively balanced, so that the system has better imaging quality and processability.

In an exemplary embodiment, the object-side surface of the first lens may be convex and the image-side surface may be concave.

In an exemplary embodiment, the object-side surface of the second lens element may be convex and the image-side surface may be concave.

In an exemplary embodiment, the object-side surface of the third lens element may be convex and the image-side surface may be concave.

In an exemplary embodiment, both the object-side surface and the image-side surface of the fourth lens may be convex.

In an exemplary embodiment, the object side surface of the fifth lens may be a concave surface.

In an exemplary embodiment, the object side surface of the sixth lens may be a concave surface.

In an exemplary embodiment, the object-side surface of the seventh lens element may be convex and the image-side surface may be concave.

In an exemplary embodiment, the object-side surface of the eighth lens element may be convex and the image-side surface may be concave.

In an exemplary embodiment, a distance TTL on an optical axis from an object side surface of the first lens to an imaging surface of the optical imaging lens, an entrance pupil diameter EPD of the optical imaging lens, and a half ImgH of a diagonal length of an effective pixel region on the imaging surface of the optical imaging lens satisfy: TTL/(EPD multiplied by ImgH) <0.5 mm^-1E.g. 0.40mm^-1≤TTL/(EPD×ImgH)＜0.5mm^-1. The mutual relation of the three is reasonably set, so that the three meets the conditions, the light receiving capacity of the optical system is favorably enhanced, the image brightness is enhanced, the imaging quality of the optical system in a long-distance view state and a close-range view state is improved, and the miniaturization and large image surface state of the optical imaging lens are favorably realized.

In an exemplary embodiment, the total effective focal length f of the optical imaging lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the radius of curvature R9 of the object-side surface of the fifth lens satisfy: -2.0< f/R8+ f/R9< 0. The mutual relation among the total effective focal length of the optical imaging lens, the curvature radius of the image side surface of the fourth lens and the curvature radius of the object side surface of the fifth lens is reasonably set, so that the optical imaging lens meets the conditions, the deflection angle of light rays in an optical system is favorably reduced, and the sensitivity of the lens is reduced.

In an exemplary embodiment, a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens satisfy: -1.0< R7/R8< 0. The ratio of the curvature radius of the object side surface of the fourth lens to the curvature radius of the image side surface of the fourth lens is set within a reasonable numerical range, so that the lower light deflection in an optical system is favorably slowed down, the overall sensitivity of the system is reduced, and the imaging quality is improved.

In an exemplary embodiment, the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens satisfy: f4/f3< -1.5, e.g., -6.0< f4/f3< -1.5. The proportional relation between the effective focal length of the fourth lens and the effective focal length of the third lens is reasonably set, so that the light receiving capacity of the optical system is enhanced, the image brightness is enhanced, and the imaging quality of the optical system in a distant view state is improved.

In an exemplary embodiment, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: -1.5< f7/f8< 0. The proportional relation between the effective focal length of the seventh lens and the effective focal length of the eighth lens is reasonably set, so that the imaging quality of the optical system in a close-range state is improved, the optical system can give consideration to close-range imaging and long-range imaging, and better imaging quality is obtained.

In an exemplary embodiment, the total effective focal length f of the optical imaging lens satisfies, with the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R1 of the object-side surface of the first lens: f/(R2-R1) is not less than 5.0. The proportion relation between the total effective focal length of the optical imaging lens and the difference between the curvature radius of the image side surface of the first lens and the curvature radius of the object side surface of the first lens is reasonably set, ghost images formed by reflection of light rays between the first lens and the second lens are reduced, the clear aperture of the optical system is increased, the long-range imaging capacity of the optical system is improved, accordingly, spherical aberration is improved, and the field sensitivity of a central area is reduced.

In an exemplary embodiment, the total effective focal length f of the optical imaging lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 0< f/R4<0.5, e.g., 0< f/R4< 0.3. The proportional relation between the total effective focal length of the optical imaging lens and the curvature radius of the image side surface of the second lens is reasonably set, so that the clear aperture of an optical system is favorably increased, the imaging quality of the optical imaging lens in a distant view state is improved, and ghost images formed in the second lens are favorably controlled.

In an exemplary embodiment, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 0< (R4-R5)/(R4+ R5) is less than or equal to 1.0. The mutual relation between the curvature radius of the image side surface of the second lens and the curvature radius of the object side surface of the third lens is reasonably set, so that the light receiving capacity of the optical system is enhanced, the image brightness is enhanced, and the imaging quality of the optical system in a distant view state is improved.

In an exemplary embodiment, a radius of curvature R6 of the image-side surface of the third lens and a radius of curvature R7 of the object-side surface of the fourth lens satisfy: -2.0< (R6+ R7)/(R6-R7) < -1.0. The mutual relation between the curvature radius of the image side surface of the third lens and the curvature radius of the object side surface of the fourth lens is reasonably set, so that the deflection of light rays is favorably slowed down, the integral sensitivity of the system is reduced, and the imaging quality of the optical system is improved. Especially in a large aperture system, the above effect is more obvious when the incident angle and the emergent angle of the light rays under the diaphragm are too large.

In an exemplary embodiment, the total effective focal length f of the optical imaging lens and the center thickness CT1 of the first lens on the optical axis satisfy: f/CT1 is more than or equal to 6.0 and less than or equal to 10. The proportional relation between the total effective focal length of the optical imaging lens and the central thickness of the first lens on the optical axis is reasonably set, so that the light receiving capacity of the optical system is enhanced, and the imaging quality of the optical system in a dark environment and a distant view state is improved.

In an exemplary embodiment, the effective focal length f2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy: 6< f2/CT2< 15. The proportional relation between the effective focal length of the second lens and the central thickness of the second lens on the optical axis is reasonably set, so that the ghost image formed by the reflection of light rays in the lens is favorably weakened, and the processing and manufacturing of the second lens are favorably realized.

In an exemplary embodiment, the total effective focal length f of the optical imaging lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: 0.5 ≦ f/| f5| + f/| f6| < 1.0. The total effective focal length of the optical imaging lens, the effective focal length of the fifth lens and the effective focal length of the sixth lens are reasonably set, so that chromatic aberration of the optical system can be eliminated, the secondary spectrum of the optical system can be reduced, and the imaging quality of the system can be improved.

In an exemplary embodiment, the separation distance T34 on the optical axis of the third lens and the fourth lens and the central thickness CT4 on the optical axis of the fourth lens satisfy: T34/CT4 is more than or equal to 1 and less than or equal to 2. The proportional relation between the spacing distance of the third lens and the fourth lens on the optical axis and the central thickness of the fourth lens on the optical axis is reasonably set, so that the forming characteristic of the lenses is favorably ensured, the deflection degree of light rays in an optical system is reduced, and the sensitivity of the system is reduced.

In an exemplary embodiment, the central thickness CT5 of the fifth lens on the optical axis is separated from the fourth lens and the fifth lens on the optical axis by a distance T45 that satisfies: 1 is less than or equal to CT5/T45< 5. The proportional relation between the central thickness of the fifth lens on the optical axis and the spacing distance between the fourth lens and the fifth lens on the optical axis is reasonably set, so that the miniaturization of the optical imaging lens is facilitated, and the surface reflection of light rays between the two lenses is avoided.

In an exemplary embodiment, a central thickness CT6 of the sixth lens on the optical axis, a central thickness CT7 of the seventh lens on the optical axis, and a central thickness CT8 of the eighth lens on the optical axis satisfy: 0.45mm < (CT6+ CT7+ CT8)/3<0.6 mm. The average central thickness of the three lenses is reasonably set, so that the compactness among the lens structures is favorably ensured, and the processing and forming of each lens are favorably realized.

In an exemplary embodiment, the abbe number V6 of the sixth lens and the abbe number V7 of the seventh lens satisfy: V6/V7 is more than or equal to 0.5 and less than 2.0. The proportional relation between the abbe number of the sixth lens and the abbe number of the seventh lens is reasonably set, so that the integral aberration of the convergent optical system is favorably converged, and the imaging quality of the system is improved.

In an exemplary embodiment, the abbe number V4 of the fourth lens, the abbe number V5 of the fifth lens, and the abbe number V6 of the sixth lens satisfy: V4-V5I/V6 is more than or equal to 1 and less than 1.5. The mutual relation of the abbe numbers of the three lenses is reasonably set, so that chromatic aberration of the system is eliminated, the corresponding aberration of different wave band light of the system is reduced, and the imaging quality of the system is improved.

In an exemplary embodiment, the optical imaging lens may further include a diaphragm. The diaphragm may be disposed at an appropriate position as required. For example, a diaphragm may be disposed between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.

The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above eight lenses. The optical imaging lens can meet the requirements of large aperture, large image plane, high pixel, portability and the like, can have excellent imaging quality in both long-range view and close-range view, and can obtain satisfactory imaging effect in different environments.

In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the eighth lens is an aspheric mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is an aspherical mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

Exemplary embodiments of the present application also provide an electronic apparatus including the above-described imaging device.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. 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 is a schematic view showing a structure 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: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

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

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

TABLE 1

In the present embodiment, the total effective focal length f of the optical imaging lens is 5.51mm, and ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S19, is 4.48 mm.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the eighth lens E8 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S16 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-7.8992E-03

6.8842E-04

-2.0199E-03

1.5124E-03

-8.0702E-04

2.5787E-04

-5.2355E-05

5.0863E-06

1.2774E-07

S2

-5.5365E-03

-1.1616E-02

3.3101E-03

-5.4319E-04

6.9849E-05

-1.1832E-06

-3.2826E-07

0.0000E+00

S3

2.2929E-02

-3.0771E-02

8.7348E-03

-7.1816E-04

0.0000E+00

S4

-2.4174E-02

1.1040E-02

-2.3909E-03

-1.2457E-03

7.9310E-04

-1.6191E-04

1.1943E-05

0.0000E+00

S5

-2.5172E-02

1.2793E-02

1.0289E-02

-1.3362E-02

5.2214E-03

-8.9188E-04

5.7719E-05

0.0000E+00

S6

-3.0104E-02

1.5108E-03

9.2813E-03

-8.5737E-03

2.4102E-03

-1.3136E-04

-3.0765E-05

0.0000E+00

S7

-9.6024E-03

7.0183E-03

-1.4851E-02

9.4090E-03

-2.8317E-03

3.1628E-04

0.0000E+00

S8

1.0131E-02

8.1996E-03

-1.8198E-02

7.7049E-03

-1.5148E-03

1.3224E-04

0.0000E+00

S9

-2.8576E-04

-1.6163E-03

-6.7933E-03

2.8539E-03

-6.1004E-04

1.6640E-04

-2.2781E-05

0.0000E+00

S10

1.5394E-02

-1.7886E-02

2.3820E-03

0.0000E+00

S11

3.4370E-02

-1.4063E-02

1.2100E-03

0.0000E+00

S12

-6.5274E-02

2.6673E-02

-6.6092E-03

7.6587E-04

1.2933E-04

-5.9900E-05

8.3487E-06

-4.3386E-07

0.0000E+00

S13

4.3736E-02

-3.0676E-02

1.0893E-02

-3.8720E-03

1.0202E-03

-1.6167E-04

1.3561E-05

-4.5991E-07

0.0000E+00

S14

8.3579E-02

-4.1591E-02

9.3789E-03

-1.2568E-03

9.9150E-05

-4.2317E-06

7.7910E-08

-1.7428E-10

0.0000E+00

S15

-1.0008E-01

2.2200E-02

-2.8601E-03

2.6883E-04

-1.8893E-05

8.8833E-07

-2.1948E-08

1.5328E-10

0.0000E+00

S16

-7.0642E-02

1.8140E-02

-3.5883E-03

4.4266E-04

-2.6801E-05

2.3449E-07

4.8863E-08

-1.6229E-09

0.0000E+00

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows 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. 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: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

Table 3 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, and the focal length are all millimeters (mm).

TABLE 3

In embodiment 2, both the object-side surface and the image-side surface of any one of the first lens E1 through the eighth lens E8 are aspheric. Table 4 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1-S16 used in example 2₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

TABLE 4

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows 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 plane after 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: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

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

In the present embodiment, the total effective focal length f of the optical imaging lens is 5.57mm, and ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S19, is 4.53 mm.

Table 5 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).

TABLE 5

In embodiment 3, both the object-side surface and the image-side surface of any one of the first lens E1 through the eighth lens E8 are aspheric. Table 6 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1-S16 used in example 3₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆And A₁₈。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

S1

-2.9092E-03

1.8256E-03

-4.1457E-03

2.6960E-03

-1.1586E-03

2.3250E-04

-1.6553E-05

0.0000E+00

S2

6.1269E-03

-5.5353E-03

1.7935E-03

-1.8469E-03

6.5916E-04

-6.8904E-05

1.0416E-07

0.0000E+00

S3

-2.4597E-19

1.6261E-25

-2.1903E-32

8.1155E-40

0.0000E+00

S4

-5.8845E-02

7.6092E-02

-6.2037E-02

3.3874E-02

-1.2813E-02

2.8974E-03

-2.8094E-04

0.0000E+00

S5

-6.3355E-02

7.5140E-02

-5.5465E-02

2.8337E-02

-1.0237E-02

2.4499E-03

-2.5913E-04

0.0000E+00

S6

-3.3283E-02

9.3573E-03

1.0200E-02

-2.0993E-02

1.5638E-02

-5.6343E-03

8.5402E-04

0.0000E+00

S7

-3.6928E-02

1.2433E-02

-2.3015E-02

1.3126E-02

-4.9367E-03

9.1347E-04

0.0000E+00

S8

-4.3406E-02

3.4462E-02

-2.5435E-02

9.1059E-03

-1.8893E-03

2.1116E-04

0.0000E+00

S9

-7.7204E-02

8.6424E-02

-4.6897E-02

1.6366E-02

-3.7619E-03

5.2846E-04

-3.6672E-05

0.0000E+00

S10

-4.9680E-02

1.8980E-02

-1.8516E-03

0.0000E+00

S11

-4.6140E-02

1.8558E-02

-1.9746E-03

0.0000E+00

S12

-4.6663E-02

2.9203E-02

-1.7132E-02

7.4383E-03

-1.5237E-03

9.3671E-05

8.8284E-06

-1.0239E-06

S13

8.5310E-02

-7.4463E-02

3.5108E-02

-1.3319E-02

3.6872E-03

-6.6381E-04

6.7503E-05

-2.8826E-06

S14

4.1354E-02

-2.5202E-02

5.2800E-03

-5.0628E-04

-1.1245E-05

7.3901E-06

-5.9277E-07

1.4371E-08

S15

-1.2976E-01

4.4237E-02

-1.1568E-02

2.2371E-03

-2.7656E-04

2.0312E-05

-8.0676E-07

1.3318E-08

S16

-6.1227E-02

1.7538E-02

-4.0396E-03

5.9239E-04

-4.7591E-05

1.6472E-06

6.4205E-09

-1.2742E-09

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows 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: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

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

In the present embodiment, the total effective focal length f of the optical imaging lens is 5.48mm, and ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S19, is 4.53 mm.

Table 7 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).

TABLE 7

In embodiment 4, of the first lens E1 to the eighth lens E8The object-side surface and the image-side surface of any lens are both aspheric surfaces. Table 8 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1-S16 used in example 4₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-6.4295E-03

2.4627E-03

-6.0238E-03

5.6966E-03

-3.3527E-03

1.1852E-03

-2.4579E-04

2.2931E-05

4.9951E-07

S2

-2.9202E-03

-1.5861E-02

5.1860E-03

-1.0786E-03

2.4347E-04

-4.0184E-05

3.1419E-06

0.0000E+00

S3

9.2698E-03

-2.6746E-02

9.2386E-03

-8.5282E-04

0.0000E+00

S4

-3.8830E-02

3.6932E-02

-2.1320E-02

7.2547E-03

-1.6602E-03

2.4621E-04

-1.7084E-05

0.0000E+00

S5

-3.5649E-02

3.6428E-02

-9.2340E-03

-5.9658E-03

3.5815E-03

-6.2035E-04

3.3015E-05

0.0000E+00

S6

-2.9600E-02

2.8800E-03

1.1628E-02

-1.4686E-02

6.6148E-03

-1.4080E-03

1.2763E-04

0.0000E+00

S7

-9.5414E-03

-1.9919E-02

8.1234E-03

6.3584E-04

-1.9030E-03

4.1221E-04

0.0000E+00

S8

4.6319E-02

-6.6431E-02

3.1357E-02

-7.6539E-03

7.4228E-04

5.8262E-06

0.0000E+00

S9

4.4017E-02

-3.6744E-02

-2.5345E-03

1.1514E-02

-4.7441E-03

8.3047E-04

-5.6924E-05

0.0000E+00

S10

1.1611E-03

-1.0184E-02

1.5546E-03

0.0000E+00

S11

-3.4784E-03

-1.2646E-03

1.3572E-04

0.0000E+00

S12

-5.4716E-02

1.2077E-02

5.8096E-03

-6.2313E-03

2.7432E-03

-6.1484E-04

6.7819E-05

-2.9357E-06

0.0000E+00

S13

4.8817E-02

-3.8771E-02

1.4445E-02

-4.8894E-03

1.2422E-03

-1.9929E-04

1.7531E-05

-6.3467E-07

0.0000E+00

S14

8.4426E-02

-4.6503E-02

1.1969E-02

-1.9984E-03

2.2391E-04

-1.6854E-05

8.0065E-07

-1.8115E-08

0.0000E+00

S15

-1.1280E-01

3.0373E-02

-4.7080E-03

4.6478E-04

-2.5664E-05

4.3636E-07

2.3487E-08

-9.3382E-10

0.0000E+00

S16

-7.1096E-02

2.0559E-02

-4.5027E-03

6.5786E-04

-5.8062E-05

2.8205E-06

-6.2206E-08

3.0101E-10

0.0000E+00

TABLE 8

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points 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: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.

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

Table 9 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).

TABLE 9

In embodiment 5, both the object-side surface and the image-side surface of any one of the first lens E1 through the eighth lens E8 are aspheric. Table 10 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1-S16 used in example 5₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Watch 10

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows 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 5 can achieve good imaging quality.

In summary, examples 1 to 5 satisfy the relationships shown in table 11, respectively.

Conditions/examples	1	2	3	4	5
						TTL/(EPD×ImgH)(mm^-1)	0.41	0.41	0.44	0.40	0.41
f/R8+f/R9	-0.46	-0.47	-1.18	-0.21	-0.37
						R7/R8	-0.70	-0.55	-0.01	-0.02	-0.20
f4/f3	-2.08	-1.78	-3.48	-5.89	-1.72
						f7/f8	-0.38	-0.56	-1.17	-0.50	-0.57
f/(R2-R1)	31.79	16.37	5.35	10.38	242.73
						f/R4	0.04	0.06	0.28	0.17	0.04
(R4-R5)/(R4+R5)	0.93	0.91	0.48	0.73	0.94
						(R6+R7)/(R6-R7)	-1.34	-1.42	-1.24	-1.12	-1.55
f/CT1	7.74	7.77	9.02	6.77	9.04
						f2/CT2	7.70	8.31	11.21	10.07	6.66
f/\|f5\|+f/\|f6\|	0.77	0.54	0.77	0.70	0.53
						T34/CT4	1.16	1.15	1.02	1.65	1.19
CT5/T45	2.14	1.57	1.00	3.95	1.75
						(CT6+CT7+CT8)/3(mm)	0.54	0.53	0.54	0.49	0.52
V6/V7	0.91	1.22	1.71	0.57	1.17
						\|V4-V5\|/V6	1.23	1.12	1.14	1.16	1.09

TABLE 11

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 the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

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

a first lens having an optical power;

a second lens having a positive optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having optical power;

a seventh lens having optical power; and

an eighth lens having a negative optical power;

wherein, a distance TTL from the object side surface of the first lens element to the imaging surface of the optical imaging lens on the optical axis, an entrance pupil diameter EPD of the optical imaging lens, and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens satisfy: TTL/(EPD is multiplied by ImgH)<0.5mm^-1And an

The total effective focal length f of the optical imaging lens, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy that: -2.0< f/R8+ f/R9< 0.

2. The optical imaging lens of claim 1, wherein the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy:

-1.0<R7/R8<0。

3. the optical imaging lens of claim 1, wherein the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens satisfy:

f4/f3<-1.5。

4. the optical imaging lens of claim 1, wherein the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy:

-1.5<f7/f8<0。

5. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens satisfies, with the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R1 of the object-side surface of the first lens:

f/(R2-R1)≥5.0。

6. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens and the radius of curvature R4 of the image side surface of the second lens satisfy:

0<f/R4<0.5。

7. the optical imaging lens of claim 1, wherein the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy:

0<(R4-R5)/(R4+R5)≤1.0。

8. the optical imaging lens of claim 1, wherein the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy:

-2.0<(R6+R7)/(R6-R7)<-1.0。

9. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens and the center thickness CT1 of the first lens on the optical axis satisfy:

6.0≤f/CT1<10。

10. the optical imaging lens of claim 1, wherein the effective focal length f2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy:

6<f2/CT2<15。

11. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy:

0.5≤f/|f5|+f/|f6|<1.0。

12. the optical imaging lens of claim 1, wherein the distance T34 separating the third lens and the fourth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy:

1≤T34/CT4<2。

13. the optical imaging lens of claim 1, wherein a center thickness CT5 of the fifth lens on the optical axis and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy:

1≤CT5/T45<5。

14. the optical imaging lens according to claim 1, wherein a center thickness CT6 of the sixth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy:

0.45mm<(CT6+CT7+CT8)/3<0.6mm。

15. the optical imaging lens of claim 1, wherein abbe number V6 of the sixth lens and abbe number V7 of the seventh lens satisfy:

0.5≤V6/V7<2.0。

16. the optical imaging lens according to claim 1, wherein abbe number V4 of the fourth lens, abbe number V5 of the fifth lens and abbe number V6 of the sixth lens satisfy:

1≤|V4-V5|/V6<1.5。

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

a first lens having an optical power;

a second lens having a positive optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having optical power;

a seventh lens having optical power; and

an eighth lens having a negative optical power;

The total effective focal length f of the optical imaging lens and the central thickness CT1 of the first lens on the optical axis satisfy that:

6.0≤f/CT1<10。

18. the optical imaging lens of claim 17, wherein the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy:

-1.0<R7/R8<0。

19. the optical imaging lens of claim 18, wherein the total effective focal length f of the optical imaging lens, the radius of curvature R8 of the image-side surface of the fourth lens and the radius of curvature R9 of the object-side surface of the fifth lens satisfy:

-2.0<f/R8+f/R9<0。

20. the optical imaging lens of claim 17, wherein the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens satisfy:

f4/f3<-1.5。

21. the optical imaging lens of claim 17, wherein the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy:

-1.5<f7/f8<0。

22. the optical imaging lens of claim 17, wherein the total effective focal length f of the optical imaging lens satisfies, with the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R1 of the object-side surface of the first lens:

f/(R2-R1)≥5.0。

23. the optical imaging lens of claim 17, wherein the total effective focal length f of the optical imaging lens and the radius of curvature R4 of the image side surface of the second lens satisfy:

0<f/R4<0.5。

24. the optical imaging lens of claim 17, wherein the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy:

0<(R4-R5)/(R4+R5)≤1.0。

25. the optical imaging lens of claim 17, wherein the radius of curvature R6 of the image side surface of the third lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy:

-2.0<(R6+R7)/(R6-R7)<-1.0。

26. the optical imaging lens of claim 17, wherein the effective focal length f2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy:

6<f2/CT2<15。

27. the optical imaging lens of claim 17, wherein the total effective focal length f of the optical imaging lens, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy:

0.5≤f/|f5|+f/|f6|<1.0。

28. the optical imaging lens of claim 17, wherein the distance T34 separating the third lens and the fourth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy:

1≤T34/CT4<2。

29. the optical imaging lens of claim 17, wherein a center thickness CT5 of the fifth lens on the optical axis and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy:

1≤CT5/T45<5。

30. the optical imaging lens of claim 17, wherein a center thickness CT6 of the sixth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy:

0.45mm<(CT6+CT7+CT8)/3<0.6mm。

31. the optical imaging lens of claim 17, wherein abbe number V6 of the sixth lens and abbe number V7 of the seventh lens satisfy:

0.5≤V6/V7<2.0。

32. the optical imaging lens according to claim 17, wherein abbe number V4 of the fourth lens, abbe number V5 of the fifth lens and abbe number V6 of the sixth lens satisfy:

1≤|V4-V5|/V6<1.5。