CN211086752U

CN211086752U - Optical imaging lens

Info

Publication number: CN211086752U
Application number: CN201921413519.7U
Authority: CN
Inventors: 李洋; 贺凌波; 赵烈烽; 戴付建
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2020-07-24
Anticipated expiration: 2029-08-28

Abstract

The application discloses an optical imaging lens, which sequentially comprises a first lens with positive focal power from an object side to an image side along an optical axis, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the image side surface of the second lens is a concave surface; a third lens with focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having a positive refractive power, an object-side surface of which is convex; and an eighth lens element having a negative refractive power, the object-side surface of which is concave, and the image-side surface of which is concave. Wherein, the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens satisfies: imgH is less than 5.80 mm; and the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens satisfy: f7/f is more than 1.00 and less than 2.00.

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

In recent years, with rapid development of portable electronic products such as smartphones and tablet computers, demands for imaging lenses mounted on portable electronic devices have been increasing. On the one hand, portable electronic products are increasingly being miniaturized and made thinner. On the other hand, imaging lenses mounted on portable electronic devices are required to have high shooting resolution. This requires that the optical imaging lens used in combination meet the requirements of miniaturization and high imaging quality. In addition, the conventional imaging lens with a small number of lenses is difficult to realize large image plane characteristics, and cannot well meet the current requirements of people on daily shooting.

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: the first lens with positive focal power has a convex object-side surface and a concave image-side surface; the image side surface of the second lens is a concave surface; a third lens with focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having a positive refractive power, an object-side surface of which is convex; and an eighth lens element having a negative refractive power, the object-side surface of which is concave, and the image-side surface of which is concave.

In one embodiment, the optical imaging lens may further include a stop disposed between the object side and the first lens.

In one embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens, may satisfy: 5.80mm < ImgH.

In one embodiment, the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens may satisfy: f7/f is more than 1.00 and less than 2.00.

In one embodiment, a distance TT L from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and a half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens satisfy TT L/ImgH < 1.10.

In one embodiment, the radius of curvature R13 of the object-side surface of the seventh lens element and the radius of curvature R16 of the image-side surface of the eighth lens element may satisfy: 0.50 < R16/R13 < 2.00.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the total effective focal length f of the optical imaging lens satisfy: r2/f is more than 1.00 and less than 3.50.

In one embodiment, the central thickness CT4 of the fourth lens on the optical axis and the separation distance T45 of the fourth lens and the fifth lens on the optical axis may satisfy: 2.00 < CT4/T45 < 5.00.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 2.00 < (R4+ R2)/(R2-R4) < 5.00.

In one embodiment, the central thickness CT5 of the fifth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 3.00 < (CT5+ CT7)/(CT7-CT5) < 7.00.

In one embodiment, an on-axis distance SAG61 from an intersection point of an object-side surface of the sixth lens and the optical axis to an effective radius vertex of the object-side surface of the sixth lens and an on-axis distance SAG62 from an intersection point of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens may satisfy: 9.00 < (SAG62+ SAG61)/(SAG62-SAG61) < 20.00.

In one embodiment, the maximum effective radius DT82 of the image-side surface of the eighth lens and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens may satisfy: 0.74 < DT 82/ImgH.

In one embodiment, the sum ∑ AT of the distance between any two adjacent lenses in the first lens to the eighth lens on the optical axis and the distance TD between the object side surface of the first lens and the image side surface of the eighth lens on the optical axis satisfy ∑ AT/TD < 0.40.

The optical imaging lens provided by the application comprises a plurality of lenses, such as a first lens to an eighth lens. The distance from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis is reasonably set to be in a proportional relation with half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, the focal power and the surface type of each lens are optimized, and the first lens and the second lens are reasonably matched with each other, so that the optical imaging lens is miniaturized, light and thin, and has a larger imaging surface and high imaging definition.

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 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 5;

fig. 11 is a schematic structural view showing an optical imaging lens according to embodiment 6 of the present application;

fig. 12A to 12D 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 6.

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, with a convex object-side surface and a concave image-side surface; the second lens can have negative focal power, and the image side surface of the second lens is a concave surface; the third lens has positive focal power or negative focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power or negative 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 element may have a positive refractive power, and the object-side surface thereof is convex; and the eighth lens element may have a negative power, and the object-side surface thereof is concave and the image-side surface thereof is concave. The focal power and the surface type of each lens in the optical system are reasonably matched, so that the aberration of the optical system can be effectively balanced, and the imaging quality is improved.

In an exemplary embodiment, the distance TT L from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens can satisfy TT L/ImgH < 1.10, specifically, TT L/ImgH < 1.10.

In an exemplary embodiment, ImgH, which is half the diagonal length of an effective pixel area on an imaging plane of an optical imaging lens, may satisfy: 5.80mm < ImgH, in particular 5.80mm < ImgH < 5.90 mm. The optical imaging lens meeting the requirement that ImgH is less than 5.80mm has a larger imaging surface and can have higher resolution.

In an exemplary embodiment, the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens may satisfy: 1.00 < f7/f < 2.00, specifically 1.00 < f7/f < 1.60. The proportional relation between the effective focal length of the seventh lens and the total effective focal length of the optical imaging lens is reasonably set, so that the optical system can be ensured to have higher aberration correction capability. Meanwhile, the proportional relation is met, the size of the optical imaging lens is favorably controlled, and the excessive concentration of focal power of the lens is avoided. The lens aberration can be better corrected by matching with other lenses.

In an exemplary embodiment, a radius of curvature R13 of the object-side surface of the seventh lens and a radius of curvature R16 of the image-side surface of the eighth lens may satisfy: 0.50 < R16/R13 < 2.00. Specifically, 0.80 < R16/R13 < 2.00. The proportional relation between the curvature radius of the object side surface of the seventh lens and the curvature radius of the image side surface of the eighth lens is reasonably set, so that the distortion of the optical imaging lens is favorably controlled within an acceptable range, and better imaging quality is obtained.

In an exemplary embodiment, the radius of curvature R2 of the image-side surface of the first lens and the total effective focal length f of the optical imaging lens may satisfy: 1.00 < R2/f < 3.50, specifically 1.60 < R2/f < 3.10. The ratio of the curvature radius of the image side surface of the first lens to the total effective focal length of the optical imaging lens is set within a reasonable numerical range, so that the object side end of the optical imaging lens has enough light convergence capacity to adjust the focusing position of a light beam, and the total length of the optical imaging lens is effectively shortened.

In an exemplary embodiment, the central thickness CT4 of the fourth lens on the optical axis and the separation distance T45 of the fourth lens and the fifth lens on the optical axis may satisfy: 2.00 < CT4/T45 < 5.00. Specifically, 2.40 < CT4/T45 < 4.60. The proportional relation of the central thickness of the fourth 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 size uniform distribution of the lenses is facilitated, the assembly stability of the lens is ensured, the aberration of the whole optical system is reduced, and the total length of the optical imaging lens is shortened.

In an exemplary embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 2.00 < (R4+ R2)/(R2-R4) < 5.00. Specifically, 2.30 < (R4+ R2)/(R2-R4) < 4.90. The mutual relation between the curvature radius of the image side surface of the first lens and the curvature radius of the image side surface of the second lens is reasonably set, so that the chromatic aberration of the optical imaging lens is favorably corrected, and the balance of various aberrations is favorably realized.

In an exemplary embodiment, the central thickness CT5 of the fifth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 3.00 < (CT5+ CT7)/(CT7-CT5) < 7.00. Specifically, 3.40 < (CT5+ CT7)/(CT7-CT5) < 7.00. The proportional relation between the central thickness of the fifth lens on the optical axis and the central thickness of the seventh lens on the optical axis is reasonably set, so that the space occupation ratio of the fifth lens and the seventh lens can be reasonably controlled, the assembly manufacturability of the optical imaging lens is ensured, and the miniaturization of the optical imaging lens is facilitated.

In an exemplary embodiment, an on-axis distance SAG61 from an intersection point of an object-side surface of the sixth lens and the optical axis to an effective radius vertex of the object-side surface of the sixth lens and an on-axis distance SAG62 from an intersection point of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens may satisfy: 9.00 < (SAG62+ SAG61)/(SAG62-SAG61) < 20.00. Specifically, 9.40 < (SAG62+ SAG61)/(SAG62-SAG61) < 19.70. The proportional relation between the axial distance from the intersection point of the object side surface of the sixth lens and the optical axis to the effective radius peak of the object side surface of the sixth lens and the axial distance from the intersection point of the image side surface of the sixth lens and the optical axis to the axial distance from the effective radius peak of the image side surface of the sixth lens is reasonably set, the adjustment of the chief ray angle of the optical imaging lens is facilitated, the relative brightness of the optical imaging lens can be effectively improved, and the image plane definition is improved.

In an exemplary embodiment, the maximum effective radius DT82 of the image-side surface of the eighth lens and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens may satisfy: 0.74 < DT82/ImgH, specifically 0.74 < DT82/ImgH < 0.80. The maximum effective radius of the image side surface of the eighth lens and the proportional relation between the maximum effective radius and half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens are reasonably set, so that the optical imaging lens has large image surface characteristics, and the size of the lens is reduced.

In an exemplary embodiment, the total of the distance between the first lens element and the eighth lens element on the optical axis ∑ AT and the distance between the object side surface of the first lens element and the image side surface of the eighth lens element on the optical axis TD satisfy ∑ AT/TD < 0.40, specifically 0.35 < ∑ AT/TD < 0.40, and the ratio of the total of the distance between the first lens element and the eighth lens element on the optical axis to the distance between the object side surface of the first lens element and the image side surface of the eighth lens element on the optical axis is controlled to be less than 0.4, which is beneficial to reasonably controlling the distance between the surfaces of the lens elements, avoiding excessive light beam deflection and reducing the processing difficulty of the optical imaging lens.

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 application provides an optical imaging lens with characteristics of large image plane, high resolution, ultra-thin and the like. The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, eight lenses as described above. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging lens is more beneficial to production and processing.

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.

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

Table 1 shows a basic parameter table of the 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 5.98mm, the distance TT L on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 6.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 5.85mm, the maximum half field angle Semi-FOV of the optical imaging lens is 43.1 °, and the f-number Fno of the optical imaging lens is 2.38.

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。

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.

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

In the present embodiment, the total effective focal length f of the optical imaging lens is 6.01mm, the distance TT L on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 6.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 5.85mm, the maximum half field angle Semi-FOV of the optical imaging lens is 42.5 °, and the f-number Fno of the optical imaging lens is 2.38.

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。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

8.7678E-04

-5.2289E-03

2.1172E-02

-5.3867E-02

8.1886E-02

-7.8291E-02

4.5450E-02

-1.4668E-02

2.0008E-03

S2

-1.1688E-02

1.1172E-02

-3.4758E-02

8.8274E-02

-1.4780E-01

1.5720E-01

-1.0176E-01

3.6104E-02

-5.3375E-03

S3

-1.6459E-02

1.2860E-02

-3.1121E-02

7.5890E-02

-1.2080E-01

1.2602E-01

-8.3186E-02

3.0990E-02

-4.8823E-03

S4

2.5584E-02

-6.7342E-02

8.1418E-02

-1.1961E-01

1.8596E-01

-2.0201E-01

1.2977E-01

-4.4599E-02

6.2770E-03

S5

-2.5461E-02

-1.2737E-02

2.7203E-02

-4.7926E-02

1.3682E-01

-1.8564E-01

1.2730E-01

-4.4088E-02

6.0281E-03

S6

-5.3650E-03

-4.6258E-03

1.9380E-02

-1.5608E-02

5.1577E-02

-6.2418E-02

2.8411E-02

-6.5652E-04

-2.0222E-03

S7

9.8479E-03

-1.6721E-02

-6.5018E-02

2.1642E-01

-4.1982E-01

5.0976E-01

-3.7548E-01

1.5234E-01

-2.5978E-02

S8

-8.1898E-03

6.7149E-02

-2.2502E-01

3.9403E-01

-4.6917E-01

3.7176E-01

-1.8747E-01

5.4104E-02

-6.8193E-03

S9

-7.2964E-02

1.2606E-01

-2.8104E-01

4.4620E-01

-4.7900E-01

3.4295E-01

-1.5528E-01

3.9901E-02

-4.4458E-03

S10

-7.3570E-02

7.8678E-02

-1.2700E-01

1.5348E-01

-1.2490E-01

6.7738E-02

-2.2629E-02

4.1246E-03

-3.1181E-04

S11

-8.6702E-02

6.2724E-02

-4.3908E-02

1.1812E-02

3.2818E-03

-4.3357E-03

1.6506E-03

-2.7767E-04

1.7073E-05

S12

-9.3239E-02

7.2698E-02

-4.6163E-02

2.0349E-02

-6.4833E-03

1.4311E-03

-1.9962E-04

1.5397E-05

-4.9084E-07

S13

-1.3440E-02

-8.3161E-03

2.2329E-03

-2.5865E-04

2.1826E-05

-6.5606E-06

1.4262E-06

-1.2666E-07

3.9429E-09

S14

1.9413E-02

-2.2628E-02

7.4236E-03

-1.5108E-03

2.0750E-04

-1.9286E-05

1.1638E-06

-4.1007E-08

6.3685E-10

S15

-2.5243E-02

1.3872E-02

-3.4134E-03

5.0667E-04

-4.7355E-05

2.8238E-06

-1.0470E-07

2.2074E-09

-2.0262E-11

S16

-2.7752E-02

8.0702E-03

-1.4352E-03

1.5516E-04

-1.0419E-05

4.0648E-07

-7.2049E-09

-1.3588E-11

1.5747E-12

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

In the present embodiment, the total effective focal length f of the optical imaging lens is 6.00mm, the distance TT L on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 6.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 5.85mm, the maximum half field angle Semi-FOV of the optical imaging lens is 42.5 °, and the f-number Fno of the optical imaging lens is 2.37.

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、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

8.7349E-04

-2.6918E-03

1.2110E-02

-3.6320E-02

5.9804E-02

-6.0218E-02

3.5932E-02

-1.1782E-02

1.6146E-03

S2

-3.8491E-03

-1.2194E-02

3.1654E-02

-6.2915E-02

8.4323E-02

-7.1109E-02

3.4725E-02

-8.8048E-03

8.6874E-04

S3

2.3264E-03

-1.7429E-02

4.0069E-02

-6.4279E-02

8.5625E-02

-8.1254E-02

4.7551E-02

-1.4999E-02

1.9274E-03

S4

8.5195E-03

-4.9943E-02

8.3201E-02

-1.5877E-01

2.8332E-01

-3.4275E-01

2.4876E-01

-9.8118E-02

1.6040E-02

S5

-2.2257E-02

-2.8691E-02

4.5527E-02

-4.8276E-02

1.2408E-01

-1.9197E-01

1.5614E-01

-6.5376E-02

1.0926E-02

S6

-6.5750E-04

-2.1538E-02

6.8175E-02

-1.3663E-01

2.6925E-01

-3.1624E-01

2.0798E-01

-6.9718E-02

8.9514E-03

S7

2.2356E-03

-1.6702E-03

-1.4008E-01

4.3198E-01

-7.9417E-01

9.1937E-01

-6.5208E-01

2.5747E-01

-4.3102E-02

S8

-6.5607E-03

8.2470E-02

-2.9449E-01

5.3148E-01

-6.3159E-01

4.9642E-01

-2.4722E-01

7.0193E-02

-8.6613E-03

S9

-7.1043E-02

1.3871E-01

-3.1083E-01

4.6875E-01

-4.7411E-01

3.2392E-01

-1.4151E-01

3.5256E-02

-3.8078E-03

S10

-7.6262E-02

8.5295E-02

-1.2917E-01

1.4466E-01

-1.0985E-01

5.6631E-02

-1.8237E-02

3.2233E-03

-2.3661E-04

S11

-8.1653E-02

5.8181E-02

-4.1609E-02

1.1808E-02

1.8800E-03

-3.0905E-03

1.1411E-03

-1.7682E-04

9.3784E-06

S12

-9.4416E-02

7.0487E-02

-4.1969E-02

1.6447E-02

-4.3804E-03

7.4077E-04

-6.4457E-05

9.5034E-07

1.5653E-07

S13

-1.5093E-02

-1.0510E-02

3.0338E-03

-3.3716E-04

5.1010E-06

-2.4278E-06

1.2901E-06

-1.5003E-07

5.4022E-09

S14

2.1077E-02

-2.8593E-02

1.0441E-02

-2.3286E-03

3.4552E-04

-3.4126E-05

2.1531E-06

-7.8347E-08

1.2477E-09

S15

-2.5106E-02

1.3772E-02

-3.3502E-03

4.9026E-04

-4.5049E-05

2.6346E-06

-9.5613E-08

1.9692E-09

-1.7621E-11

S16

-2.8053E-02

8.3843E-03

-1.5806E-03

1.8348E-04

-1.3372E-05

5.7713E-07

-1.2261E-08

4.2676E-11

1.7088E-12

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

In the present embodiment, the total effective focal length f of the optical imaging lens is 5.98mm, the distance TT L on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 6.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 5.85mm, the maximum half field angle Semi-FOV of the optical imaging lens is 42.7 °, and the f-number Fno of the optical imaging lens is 2.37.

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, 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 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。

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

In the present embodiment, the total effective focal length f of the optical imaging lens is 6.00mm, the distance TT L on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 6.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 5.85mm, the maximum half field angle Semi-FOV of the optical imaging lens is 42.6 °, and the f-number Fno of the optical imaging lens is 2.37.

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。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.6373E-04

-2.5647E-03

1.3249E-02

-3.8807E-02

6.5067E-02

-6.6574E-02

4.0623E-02

-1.3645E-02

1.9334E-03

S2

-1.5436E-02

1.1019E-02

-1.3548E-02

3.3955E-02

-6.1631E-02

6.6494E-02

-4.1850E-02

1.3979E-02

-1.8527E-03

S3

-2.1724E-02

1.6320E-02

-1.9667E-02

5.0802E-02

-9.5706E-02

1.0900E-01

-7.3849E-02

2.7396E-02

-4.2369E-03

S4

3.1868E-02

-7.6467E-02

9.4205E-02

-1.2262E-01

1.4415E-01

-1.2457E-01

6.8132E-02

-2.0303E-02

2.2914E-03

S5

-1.7856E-02

-1.3916E-02

-5.8471E-03

6.3120E-02

-1.0779E-01

1.3218E-01

-1.1033E-01

5.2088E-02

-1.0548E-02

S6

-5.9882E-03

-3.7270E-03

9.0357E-03

2.1580E-02

-4.3183E-02

7.2209E-02

-7.7216E-02

4.3095E-02

-9.4837E-03

S7

-1.0923E-02

-1.9776E-02

1.9336E-02

-5.8972E-02

1.1098E-01

-1.2464E-01

8.5075E-02

-3.4227E-02

6.6557E-03

S8

-1.0500E-02

5.5274E-02

-2.4304E-01

5.0608E-01

-6.7394E-01

5.7719E-01

-3.0383E-01

8.8759E-02

-1.1016E-02

S9

-3.4316E-02

8.3150E-02

-2.4195E-01

4.3649E-01

-5.1104E-01

3.9574E-01

-1.9014E-01

5.0673E-02

-5.7195E-03

S10

-5.9702E-02

5.5373E-02

-9.3732E-02

1.0732E-01

-8.0056E-02

3.9526E-02

-1.1701E-02

1.8020E-03

-1.0697E-04

S11

-7.5974E-02

5.1455E-02

-4.0227E-02

1.2908E-02

1.4975E-03

-3.5623E-03

1.5616E-03

-3.0792E-04

2.4026E-05

S12

-8.6010E-02

5.5951E-02

-3.2656E-02

1.2866E-02

-3.4632E-03

6.0153E-04

-5.6279E-05

1.3871E-06

1.0182E-07

S13

-2.4463E-02

-1.0424E-02

3.7452E-03

-1.5003E-03

8.0616E-04

-2.6108E-04

4.4368E-05

-3.7410E-06

1.2407E-07

S14

2.6000E-02

-2.5268E-02

6.7225E-03

-7.3057E-04

-2.0633E-05

1.3928E-05

-1.4391E-06

6.3040E-08

-1.0102E-09

S15

-2.5486E-02

1.4109E-02

-3.4763E-03

5.1390E-04

-4.7519E-05

2.7836E-06

-1.0070E-07

2.0573E-09

-1.8160E-11

S16

-2.5082E-02

7.2904E-03

-1.3440E-03

1.5039E-04

-1.0473E-05

4.3442E-07

-9.1925E-09

4.8335E-11

8.4444E-13

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.

Example 6

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

As shown in fig. 11, 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 negative 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 negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In the present embodiment, the total effective focal length f of the optical imaging lens is 6.02mm, the distance TT L on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 6.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 5.85mm, the maximum half field angle Semi-FOV of the optical imaging lens is 42.5 °, and the f-number Fno of the optical imaging lens is 2.38.

Table 11 shows a basic parameter table of the optical imaging lens of embodiment 6, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 11

In embodiment 6, 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 12 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1-S16 used in example 6₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

TABLE 12

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

In summary, examples 1 to 6 each satisfy the relationship shown in table 13.

Conditions/examples	1	2	3	4	5	6
							TTL/ImgH	1.08	1.08	1.08	1.08	1.07	1.07
f7/f	1.51	1.27	1.44	1.50	1.25	1.16
							R16/R13	1.92	1.66	1.70	1.70	0.99	1.67
R2/f	1.61	2.38	3.05	2.34	2.16	2.13
							CT4/T45	2.49	3.93	4.31	4.56	3.59	3.87
(R4+R2)/(R2-R4)	3.00	2.49	2.77	4.82	2.47	3.07
							(CT5+CT7)/(CT7-CT5)	6.06	4.05	5.14	6.93	6.50	3.50
(SAG62+SAG61)/(SAG62-SAG61)	15.46	10.59	10.21	9.83	19.69	9.46
							DT82/ImgH	0.77	0.76	0.75	0.75	0.78	0.77
∑AT/TD	0.39	0.38	0.39	0.39	0.37	0.37

Watch 13

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:

the first lens with positive focal power has a convex object-side surface and a concave image-side surface;

the image side surface of the second lens is a concave surface;

a third lens with focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having optical power;

a seventh lens having a positive refractive power, an object-side surface of which is convex; and

an eighth lens element with negative refractive power having a concave object-side surface and a concave image-side surface;

wherein, the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens satisfies: imgH is less than 5.80 mm; and

the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens satisfy that: f7/f is more than 1.00 and less than 2.00.

2. The optical imaging lens of claim 1, wherein the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R16 of the image-side surface of the eighth lens satisfy: 0.50 < R16/R13 < 2.00.

3. The optical imaging lens of claim 1, wherein the radius of curvature R2 of the image side surface of the first lens and the total effective focal length f of the optical imaging lens satisfy: r2/f is more than 1.00 and less than 3.50.

4. The optical imaging lens of claim 1, wherein a center thickness CT4 of the fourth lens on the optical axis and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy: 2.00 < CT4/T45 < 5.00.

5. The optical imaging lens of claim 1, wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 2.00 < (R4+ R2)/(R2-R4) < 5.00.

6. The optical imaging lens of claim 1, wherein a central thickness CT5 of the fifth lens on the optical axis and a central thickness CT7 of the seventh lens on the optical axis satisfy: 3.00 < (CT5+ CT7)/(CT7-CT5) < 7.00.

7. The optical imaging lens of claim 1, wherein an on-axis distance from an intersection point of an object-side surface of the sixth lens and the optical axis to an effective radius vertex of the object-side surface of the sixth lens SAG61 and an intersection point of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens SAG62 satisfy: 9.00 < (SAG62+ SAG61)/(SAG62-SAG61) < 20.00.

8. The optical imaging lens according to claim 1, wherein a maximum effective radius DT82 of the image side surface of the eighth lens element and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens satisfy: 0.74 < DT 82/ImgH.

9. The optical imaging lens according to any one of claims 1 to 8, wherein a sum ∑ AT of distances between any two adjacent lenses of the first to eighth lenses on the optical axis and a distance TD between an object side surface of the first lens and an image side surface of the eighth lens on the optical axis satisfy ∑ AT/TD < 0.40.

10. The optical imaging lens of any one of claims 1 to 8, wherein a distance TT L from an object side surface of the first lens to an imaging surface of the optical imaging lens on the optical axis and a half ImgH of a diagonal length of an effective pixel region on the imaging surface of the optical imaging lens satisfy TT L/ImgH < 1.10.

11. The optical imaging lens according to any one of claims 1 to 8, characterized in that the optical imaging lens further comprises a diaphragm disposed between the object side and the first lens.

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

the image side surface of the second lens is a concave surface;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having optical power;

a center thickness CT5 of the fifth lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis satisfy: 3.00 < (CT5+ CT7)/(CT7-CT5) < 7.00.

13. The optical imaging lens of claim 12, wherein the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R16 of the image-side surface of the eighth lens satisfy: 0.50 < R16/R13 < 2.00.

14. The optical imaging lens of claim 12, wherein the radius of curvature R2 of the image side surface of the first lens and the total effective focal length f of the optical imaging lens satisfy: r2/f is more than 1.00 and less than 3.50.

15. The optical imaging lens of claim 14, wherein the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens satisfy: f7/f is more than 1.00 and less than 2.00.

16. The optical imaging lens of claim 12, wherein the center thickness CT4 of the fourth lens on the optical axis and the separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy: 2.00 < CT4/T45 < 5.00.

17. The optical imaging lens of claim 12, wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 2.00 < (R4+ R2)/(R2-R4) < 5.00.

18. The optical imaging lens of claim 12, wherein an on-axis distance SAG61 from an intersection point of an object-side surface of the sixth lens and the optical axis to an effective radius vertex of the object-side surface of the sixth lens to an on-axis distance SAG62 from an intersection point of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens satisfies: 9.00 < (SAG62+ SAG61)/(SAG62-SAG61) < 20.00.

19. The optical imaging lens according to claim 12, wherein a maximum effective radius DT82 of the image side surface of the eighth lens element and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens satisfy: 0.74 < DT 82/ImgH.

20. The optical imaging lens according to any one of claims 12 to 19, wherein a sum ∑ AT of the distances between any two adjacent lenses of the first to eighth lenses on the optical axis and a distance TD between an object side surface of the first lens and an image side surface of the eighth lens on the optical axis satisfy ∑ AT/TD < 0.40.

21. The optical imaging lens of any one of claims 12 to 19, wherein a distance TT L from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens satisfy TT L/ImgH < 1.10.

22. The optical imaging lens according to any one of claims 12 to 19, characterized in that the optical imaging lens further comprises a diaphragm disposed between the object side and the first lens.