CN211826691U

CN211826691U - Optical imaging lens

Info

Publication number: CN211826691U
Application number: CN202020308301.1U
Authority: CN
Inventors: 黄文博; 贺凌波; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2020-03-12
Filing date: 2020-03-12
Publication date: 2020-10-30
Anticipated expiration: 2030-03-12

Abstract

The application discloses optical imaging lens, wherein, optical imaging lens includes along optical axis from the object side to image side in proper order: 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 and the total effective focal length f of the optical imaging lens meet the following conditions: TTL/f is less than or equal to 1.0; and the aperture value Fno of the optical imaging lens meets the following conditions: fno is more than or equal to 1.45 and less than or equal to 2.0.

Description

Optical imaging lens

Technical Field

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

Background

In recent years, with the development of science and technology, a mobile phone lens with high imaging quality is more and more favored by people, and the total length of the imaging lens is limited due to the reduction of the thickness of the mobile phone, so that the design difficulty of the mobile phone lens is increased.

Meanwhile, the performance of a photosensitive element photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) element commonly used by the imaging lens of the mobile phone is improved, the size of a pixel is reduced, and higher requirements are put forward for the corresponding optical imaging lens.

In general, a telephoto lens in an imaging lens generally improves imaging quality by increasing the number of lenses, but the increase of the number of lenses will affect the total length of the lens, so how to balance lens miniaturization and imaging quality is a problem to be solved in the telephoto lens.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging lens, such as a telephoto lens, applicable to portable electronic products, which may solve at least or partially 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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power.

In one embodiment, the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens satisfy: TTL/f is less than or equal to 1.0.

In one embodiment, the aperture value Fno of the optical imaging lens satisfies: fno is more than or equal to 1.45 and less than or equal to 2.0.

In one embodiment, the effective focal length f4 of the fourth lens, the effective focal length f7 of the seventh lens and the effective focal length f1 of the first lens satisfy: -2.0 < (f4+ f7)/f1 < -1.0.

In one embodiment, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens and the total effective focal length f of the optical imaging lens satisfy: 2.0 < (f3+ f5)/f < 3.0.

In one embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R1 of the object-side surface of the first lens satisfy: 0.5 < R5/R1 < 1.5.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 1.0 < R2/R3 < 1.5.

In one embodiment, the radius of curvature R4 of the image-side surface of the second lens, 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: -4.5 < (R4+ R6)/R7 < -0.5.

In one embodiment, a radius of curvature R8 of the image-side surface of the fourth lens and a radius of curvature R9 of the object-side surface of the fifth lens satisfy: 1.5 < R9/R8 < 3.5.

In one embodiment, a radius of curvature R11 of an object-side surface of the sixth lens, a radius of curvature R12 of an image-side surface of the sixth lens, and a radius of curvature R13 of an object-side surface of the seventh lens satisfy: 2.5 is less than or equal to (R11+ R13)/R12 is less than 8.0.

In one embodiment, an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 3.5 < T34/(T12+ T23) < 15.

In one embodiment, an air interval T45 of the fourth lens and the fifth lens on the optical axis and an air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 1.5 < T78/T45 < 2.5.

In one embodiment, an air interval T56 of the fifth lens and the sixth lens on the optical axis and an air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: T56/T67 is more than or equal to 5.0 and less than or equal to 43.0.

In one embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.0 is less than or equal to CT1/(CT2+ CT3) < 1.5.

In one embodiment, the TV distortion TV of the optical imaging lens satisfies: the | TV | is less than or equal to 2.5 percent.

In one embodiment, the third lens element has a positive optical power, a convex object-side surface and a concave image-side surface.

In one embodiment, the seventh lens element has a negative power and has a concave object-side surface and a convex image-side surface.

The optical imaging lens provided by the application adopts a plurality of lenses, such as the first lens to the eighth lens, and has at least one beneficial effect of long focus, miniaturization, high imaging quality and the like by reasonably distributing the focal power, the surface type, the curvature radius, the central thickness of each lens, the on-axis distance and the air interval between the adjacent lenses.

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.

The optical imaging lens according to an exemplary embodiment of the present application may include, for example, eight lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The eight lenses are arranged in order from an object side to an image side along an optical axis. In the first to eighth lenses, each of two adjacent lenses may have an air space therebetween.

In an exemplary embodiment, the first lens has a positive or negative power; the second lens has positive focal power or negative focal power; the third lens has positive focal power or negative focal power; 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 has positive or negative optical power and the eighth lens has positive or negative optical power.

In an exemplary embodiment, the first lens may have a positive optical power, and the object side surface 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 third lens may have a positive optical power, and the object-side surface thereof may be convex and the image-side surface thereof may be concave. The focal power of the third lens and the curvature radiuses of the object side surface and the image side surface of the third lens are reasonably distributed, so that the light convergence and the distribution of the focal power of each lens are facilitated.

In an exemplary embodiment, the fourth lens may have a negative optical power, and the object side surface thereof may be concave and the image side surface thereof may be concave.

In an exemplary embodiment, the fifth lens may have a positive optical power, and the object-side surface thereof may be convex.

In an exemplary embodiment, the sixth lens element may have a positive optical power, and the object-side surface thereof may be concave and the image-side surface thereof may be convex.

In an exemplary embodiment, the seventh lens element may have a negative power, and the object-side surface thereof may be concave and the image-side surface thereof may be convex. The optical power of the seventh lens and the curvature radiuses of the object side surface and the image side surface of the seventh lens are reasonably distributed, so that the convergence of marginal rays is facilitated.

In an exemplary embodiment, the eighth lens may have a negative optical power, and the object side surface thereof 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 and a total effective focal length f of the optical imaging lens satisfy: TTL/f is less than or equal to 1.0. For example, 0.9 ≦ TTL/f ≦ 1.0. The ratio of the total length of the system to the total focal length is reasonably controlled within a reasonable range, so that the depth of field can be increased on the premise of ensuring the miniaturization of the system, and more information in the longitudinal direction of an object space can be obtained.

In an exemplary embodiment, the aperture value Fno of the optical imaging lens satisfies: fno is more than or equal to 1.45 and less than or equal to 2.0. The aperture value of the system is reasonably controlled within a reasonable range, so that the system can obtain more light entering amount, and the shot scenery is brighter.

In an exemplary embodiment, the effective focal length f4 of the fourth lens, the effective focal length f7 of the seventh lens, and the effective focal length f1 of the first lens satisfy: -2.0 < (f4+ f7)/f1 < -1.0. For example, -1.8 < (f4+ f7)/f1 < -1.2. By restricting the ratio of the sum of the effective focal lengths of the fourth lens and the seventh lens to the effective focal length of the first lens within a reasonable range, the focal power between the lenses of the system can be reasonably distributed, and the overall sensitivity is reduced.

In an exemplary embodiment, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the total effective focal length f of the optical imaging lens satisfy: 2.0 < (f3+ f5)/f < 3.0. By restricting the ratio of the sum of the effective focal lengths of the third lens and the fifth lens to the total effective focal length of the system within a reasonable range, the contribution degree of the middle lens of the system to aberration can be effectively controlled, the aberration of the system is reduced, and the imaging quality is improved.

In an exemplary embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R1 of the object-side surface of the first lens satisfy: 0.5 < R5/R1 < 1.5. For example, 0.9 < R5/R1 < 1.2. By reasonably controlling the ratio of the curvature radius of the object side surface of the third lens and the curvature radius of the object side surface of the first lens, the incidence angle of the central field of view rays reaching the two surfaces can be smaller, and the tolerance sensitivity of the optical Modulation Transfer Function (MTF) of the central field of view is reduced.

In an exemplary embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 1.0 < R2/R3 < 1.5. For example, 1.1 < R2/R3 < 1.3. The curvature radius ratio of the image side surface of the first lens and the object side surface of the second lens is reasonably controlled, the size of the incident angle of the inner field of view on the second lens can be controlled, and the aberration of the inner field of view can be favorably controlled.

In an exemplary embodiment, the radius of curvature R4 of the image-side surface of the second lens, 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: -4.5 < (R4+ R6)/R7 < -0.5. For example, -4.5 < (R4+ R6)/R7 < -0.9. By restricting the ratio of the sum of the curvature radii of the image side surface of the second lens and the image side surface of the third lens to the curvature radius of the object side surface of the fourth lens within a certain range, the coma aberration of the on-axis view field and the off-axis view field can be smaller, and the imaging system has good imaging quality.

In an exemplary embodiment, a radius of curvature R8 of the image-side surface of the fourth lens and a radius of curvature R9 of the object-side surface of the fifth lens satisfy: 1.5 < R9/R8 < 3.5. For example, 1.8 < R9/R8 < 3.4. The curvature radius ratio of the image side surface of the fourth lens and the object side surface of the fifth lens is reasonably controlled, so that light rays of marginal field can enter the fourth lens and the fifth lens at smaller incidence angles, and the aberration of the off-axis field can be corrected.

In an exemplary embodiment, a radius of curvature R11 of an object-side surface of the sixth lens, a radius of curvature R12 of an image-side surface of the sixth lens, and a radius of curvature R13 of an object-side surface of the seventh lens satisfy: 2.5 is less than or equal to (R11+ R13)/R12 is less than 8.0. By restricting the ratio of the sum of the curvature radii of the object side surface of the sixth lens and the object side surface of the seventh lens to the curvature radius of the image side surface of the sixth lens within a certain range, the curvature of field of each off-axis field can be balanced, and the imaging quality of the off-axis field can be improved.

In the exemplary embodiment, an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 3.5 < T34/(T12+ T23) < 15. By satisfying the conditional expression 3.5 < T34/(T12+ T23) < 15, the sensitivities of the front lenses, the first to fourth lenses, can be reasonably allocated, improving the manufacturability.

In the exemplary embodiment, an air interval T45 of the fourth lens and the fifth lens on the optical axis and an air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 1.5 < T78/T45 < 2.5. For example, 1.6 < T78/T45 < 2.2. The condition that T78/T45 is more than 2.5 is satisfied, so that the total length of the system is reduced, the aberration distribution is improved, and the imaging quality is improved.

In the exemplary embodiment, an air interval T56 of the fifth lens and the sixth lens on the optical axis and an air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: T56/T67 is more than or equal to 5.0 and less than or equal to 43.0. By satisfying the conditional expression that T56/T67 is more than or equal to 5.0 and less than 43.0, the relative illumination of the off-axis visual field is increased.

In an exemplary embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.0 is less than or equal to CT1/(CT2+ CT3) < 1.5. For example, 1.1 < CT1/(CT2+ CT3) < 1.4. The ratio of the central thickness of the first lens to the sum of the central thicknesses of the second lens and the third lens is reasonably controlled within a certain range, so that the shape of the front lenses from the first lens to the third lens is favorably controlled, and the processing, forming and assembling of the lenses are favorably realized.

In an exemplary embodiment, a TV distortion TV of an optical imaging lens satisfies: the | TV | is less than or equal to 2.5 percent. The TV distortion of the system is reasonably controlled within a reasonable range, so that the distortion degree of the imaging image quality is reduced, and the imaging quality 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 third lens and the fourth 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 long focus, high imaging quality, miniaturization 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, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging lens is more favorable for 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 aspheric 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.

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: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop STO, 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 plane S19.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a 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 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 concave object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a 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, 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 12.87mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 11.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 2.50mm, the relative F-number (i.e., aperture value) Fno of the optical imaging lens is 2.00, and the maximum half field angle Semi-FOV of the optical imaging lens is 10.9 °.

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、A₁₆And A₁₈。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

S1

-1.1240E-01

-1.1377E-02

4.9933E-03

3.0378E-03

8.8292E-04

-1.5590E-04

-1.4893E-04

-2.2157E-05

S2

-3.9087E-02

2.7176E-02

3.0328E-03

2.7106E-03

-7.1785E-04

-1.4783E-03

6.0278E-04

-5.1190E-05

S3

3.8088E-02

8.0488E-03

2.3618E-03

9.9239E-04

9.1212E-04

-4.5947E-04

-4.5054E-05

3.7895E-05

S4

-6.1078E-03

-3.9671E-03

8.2708E-03

-1.3386E-03

1.8275E-03

9.1823E-05

-1.0555E-04

2.3586E-05

S5

-5.8223E-02

-1.8672E-02

-5.7536E-04

-1.1191E-03

9.6573E-04

-1.4847E-04

1.0524E-05

-7.1286E-06

S6

-1.5904E-01

-3.3154E-02

7.7908E-03

8.9115E-04

-1.8940E-03

-7.8164E-05

1.4905E-04

-1.0412E-04

S7

2.1936E-02

1.6047E-02

-2.0826E-04

1.2099E-04

7.5889E-04

-1.2732E-04

9.2575E-06

2.6897E-06

S8

2.0727E-02

1.2881E-02

1.2990E-03

-7.0948E-04

3.1253E-05

3.0008E-05

-3.3896E-06

2.0137E-06

S9

2.7375E-02

7.2014E-03

2.6641E-03

4.0337E-03

3.0218E-03

6.4356E-04

1.1566E-04

3.3423E-05

S10

-2.9276E-01

-7.2130E-03

9.0628E-03

4.5882E-03

3.3966E-03

1.0941E-03

3.8669E-04

7.8879E-05

S11

-5.3076E-01

6.9468E-02

1.7419E-02

-8.6142E-03

1.0102E-02

3.1156E-04

-3.2249E-03

-1.1067E-03

S12

-5.9764E-02

4.1647E-02

6.9848E-03

-2.4234E-03

6.7292E-03

-1.7201E-03

8.7026E-04

-1.2047E-03

S13

3.8861E-02

-1.1212E-01

-1.8496E-03

3.3582E-02

-9.5309E-03

-8.5506E-03

-4.2886E-03

-1.0956E-03

S14

1.9873E+00

-5.0423E-01

9.3845E-02

4.3579E-02

-3.4460E-02

4.8169E-03

-5.4707E-04

1.7161E-02

S15

4.8910E-01

-6.1018E-02

-3.8897E-01

8.5919E-02

8.7450E-02

9.3691E-03

-2.6668E-02

-1.0670E-02

S16

-2.7313E+00

3.1475E-01

-2.5549E-01

2.2505E-02

5.3565E-02

1.1211E-01

5.0406E-02

1.4191E-02

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: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop STO, 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 plane S19.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a 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 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 concave object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object 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 10.88mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 10.88mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 2.50mm, the relative F-number (i.e., aperture value) Fno of the optical imaging lens is 1.90, and the maximum half field angle Semi-FOV of the optical imaging lens is 12.8 °.

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, 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 gives the higher order mirror surfaces that can be used for the aspherical mirror surfaces S1-S16 in example 2Coefficient of term A₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆And A₁₈。

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: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop STO, 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 plane S19.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has 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 concave object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object 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 10.59mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the image plane S19 is 10.49mm, the half ImgH of the diagonal length of the effective pixel region on the image plane S19 is 2.50mm, the relative F-number (i.e., aperture value) Fno of the optical imaging lens is 1.80, and the maximum half field angle Semi-FOV of the optical imaging lens is 13.5 °

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, 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

-1.3051E-01

-8.6341E-03

1.4282E-02

5.3428E-03

4.8246E-04

-2.9212E-04

-1.1388E-04

-1.4118E-05

S2

-3.2371E-02

2.8250E-02

4.5236E-03

-7.0425E-04

-3.1827E-04

-3.3174E-04

-2.2659E-04

1.9359E-04

S3

5.4387E-02

1.3235E-02

8.0511E-03

1.6647E-03

1.2582E-03

-2.5928E-04

-6.5092E-04

5.0333E-05

S4

-1.5895E-03

-2.1344E-03

8.9399E-03

1.0517E-04

1.7062E-03

9.7982E-05

-1.1880E-04

1.2013E-05

S5

-1.0052E-01

-2.6461E-02

-1.7903E-03

-9.2470E-04

3.9739E-04

-7.2051E-05

-7.2972E-05

-1.6405E-05

S6

-7.5578E-02

-2.2152E-02

1.7633E-03

1.1940E-03

-3.8392E-04

3.3376E-05

-1.2831E-05

4.1128E-06

S7

4.8892E-03

6.4080E-03

-1.4142E-03

-2.5530E-04

2.4881E-04

-5.9430E-05

4.6259E-06

-2.9820E-07

S8

3.5358E-02

1.9186E-02

3.9301E-04

-1.2736E-03

-1.4943E-04

-6.8977E-05

-4.3955E-06

5.6786E-07

S9

2.1800E-03

4.9217E-03

-3.2812E-04

-6.2856E-04

-7.9232E-05

-2.0196E-05

-6.2602E-06

-1.7524E-06

S10

-1.0199E-01

-1.2742E-03

-4.5320E-04

-4.9377E-04

1.7205E-05

1.3733E-06

1.4680E-06

7.7748E-07

S11

-1.9203E-01

2.9291E-03

4.3034E-03

-5.9452E-04

1.9433E-05

3.8259E-05

8.4328E-06

1.4245E-06

S12

-5.3653E-02

1.6038E-03

5.4855E-03

-1.1605E-03

7.3654E-04

-2.5424E-04

-1.8102E-05

6.1005E-05

S13

1.5727E-03

8.1458E-03

-1.1610E-03

4.5340E-03

1.5339E-03

2.0951E-04

8.0482E-04

3.0733E-04

S14

-2.6402E-02

2.2472E-02

-6.9105E-03

4.0398E-03

-6.8800E-04

-9.9004E-05

9.0959E-05

4.9315E-06

S15

-1.9369E-01

7.6920E-02

-1.1660E-02

9.8646E-03

2.4702E-04

2.4445E-05

-2.3034E-04

4.6900E-05

S16

-8.2244E-01

7.1173E-02

-2.8505E-02

1.4134E-02

8.1111E-04

1.3790E-03

-3.8177E-05

1.6041E-04

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: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop STO, 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 plane S19.

In the present embodiment, the total effective focal length F of the optical imaging lens is 10.71mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 10.50mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 2.50mm, the relative F-number (i.e., aperture value) Fno of the optical imaging lens is 1.70, and the maximum half field angle Semi-FOV of the optical imaging lens is 13.4 °.

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, 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、A₁₆And A₁₈。

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: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop STO, 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 plane S19.

In the present embodiment, the total effective focal length F of the optical imaging lens is 10.67mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 10.56mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 2.50mm, the relative F-number (i.e., aperture value) Fno of the optical imaging lens is 1.45, and the maximum half field angle Semi-FOV of the optical imaging lens is 13.0 °.

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, 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、A₁₆And A₁₈。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

S1

-2.8743E-01

-3.5377E-02

1.9362E-02

5.1532E-03

-4.0225E-03

-3.4460E-03

-1.0288E-03

-1.3050E-04

S2

-6.8101E-02

8.0398E-02

3.0463E-03

-4.2725E-03

-4.4312E-03

1.8042E-04

6.5397E-04

-1.2421E-04

S3

5.2925E-02

1.4237E-02

5.5718E-03

1.2573E-03

6.5062E-04

3.1174E-04

-3.2400E-04

4.5884E-05

S4

1.1002E-01

5.1494E-02

3.4636E-02

2.1699E-03

1.5580E-03

-2.4970E-03

-7.2473E-04

4.4210E-04

S5

-1.1119E-01

-1.2843E-02

4.4508E-03

-8.5485E-04

3.7498E-04

-9.3075E-05

3.3910E-07

-3.4358E-06

S6

-4.8492E-02

-1.1239E-02

3.5027E-03

9.3179E-04

-4.6699E-04

-2.5330E-06

1.4224E-05

1.3797E-06

S7

7.9024E-02

1.9775E-02

-3.5666E-03

2.1511E-03

-5.0157E-04

-1.8860E-04

2.1348E-04

-3.4800E-05

S8

1.6800E-02

2.3420E-02

2.5856E-03

-3.4153E-05

2.1372E-04

-5.1980E-05

-2.1354E-05

-7.9342E-06

S9

-5.5984E-03

4.3366E-03

1.0596E-03

-3.2056E-04

1.5520E-05

-1.2165E-05

-5.4170E-06

5.1315E-08

S10

-6.9684E-02

-6.4672E-03

-9.4937E-04

-4.3884E-04

8.6137E-05

2.0901E-05

1.0755E-05

2.3782E-06

S11

-2.2423E-01

-1.1250E-02

1.9742E-03

-1.5330E-04

1.0795E-04

2.4177E-05

-6.8042E-06

2.2194E-06

S12

-1.2202E-01

1.0140E-02

-1.0424E-03

1.1643E-03

-6.4542E-04

3.2126E-04

-1.0800E-04

1.8105E-05

S13

1.1043E-01

-4.8656E-02

-1.4323E-02

9.5658E-04

-2.9179E-03

2.3380E-03

1.5377E-04

5.4431E-04

S14

1.8942E-01

-2.5784E-02

4.1102E-04

2.8829E-03

-1.5957E-03

3.8987E-04

-8.6028E-05

2.0660E-05

S15

-3.6028E-01

1.0478E-01

-2.3027E-02

1.4508E-02

-1.3570E-03

2.9411E-04

-6.2836E-04

2.0044E-04

S16

-9.6577E-01

1.4354E-01

-6.3979E-02

2.1034E-02

-3.3907E-03

2.9031E-03

-6.8920E-04

3.7589E-04

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/f	0.91	1.00	0.99	0.98	0.99
(f4+f7)/f1	-1.30	-1.57	-1.70	-1.53	-1.24
						(f3+f5)/f	2.183	2.544	2.76	2.51	2.93
R5/R1	1.17	1.10	0.96	0.95	0.96
						R2/R3	1.15	1.22	1.16	1.17	1.18
(R4+R6)/R7	-1.60	-2.47	-0.99	-1.26	-4.37
						R9/R8	2.06	1.83	3.31	3.36	2.80
(R11+R13)/R12	2.53	2.73	2.85	2.87	8.04
						T34/(T12+T23)	3.64	4.78	14.66	5.70	4.63
T78/T45	2.00	2.05	2.08	2.11	1.62
						T56/T67	5.15	5.21	14.82	32.63	42.98
CT1/(CT2+CT3)	1.25	1.36	1.14	1.22	1.29

TABLE 11

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 group described above.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of 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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having a refractive power;

the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens meet the following requirements: TTL/f is less than or equal to 1.0; and

the aperture value Fno of the optical imaging lens meets the following conditions: fno is more than or equal to 1.45 and less than or equal to 2.0.

2. The optical imaging lens of claim 1, wherein the effective focal length f4 of the fourth lens, the effective focal length f7 of the seventh lens and the effective focal length f1 of the first lens satisfy: -2.0 < (f4+ f7)/f1 < -1.0.

3. The optical imaging lens of claim 1, wherein the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens and the total effective focal length f of the optical imaging lens satisfy: 2.0 < (f3+ f5)/f < 3.0.

4. The optical imaging lens of claim 1, wherein the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R1 of the object-side surface of the first lens satisfy: 0.5 < R5/R1 < 1.5.

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 R3 of the object side surface of the second lens satisfy: 1.0 < R2/R3 < 1.5.

6. The optical imaging lens of claim 1, wherein the radius of curvature R4 of the image-side surface of the second lens, 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: -4.5 < (R4+ R6)/R7 < -0.5.

7. The optical imaging lens of claim 1, wherein 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: 1.5 < R9/R8 < 3.5.

8. The optical imaging lens of claim 1, wherein the radius of curvature R11 of the object-side surface of the sixth lens, the radius of curvature R12 of the image-side surface of the sixth lens, and the radius of curvature R13 of the object-side surface of the seventh lens satisfy: 2.5 is less than or equal to (R11+ R13)/R12 is less than 8.0.

9. The optical imaging lens according to claim 1, wherein an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 3.5 < T34/(T12+ T23) < 15.

10. The optical imaging lens of claim 1, wherein an air interval T45 of the fourth lens and the fifth lens on the optical axis and an air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 1.5 < T78/T45 < 2.5.

11. The optical imaging lens of claim 1, wherein an air interval T56 of the fifth lens and the sixth lens on the optical axis and an air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: T56/T67 is more than or equal to 5.0 and less than or equal to 43.0.

12. The optical imaging lens according to claim 1, wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 1.0 is less than or equal to CT1/(CT2+ CT3) < 1.5.

13. The optical imaging lens according to claim 1, wherein a TV distortion TV of the optical imaging lens satisfies: the | TV | is less than or equal to 2.5 percent.

14. The optical imaging lens of claim 1, wherein the third lens element has a positive optical power, and has a convex object-side surface and a concave image-side surface.

15. The optical imaging lens of claim 1, wherein the seventh lens element has a negative power, and the object-side surface is concave and the image-side surface is convex.

16. An optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which have focal power;

an effective focal length f4 of the fourth lens, an effective focal length f7 of the seventh lens, and an effective focal length f1 of the first lens satisfy: -2.0 < (f4+ f7)/f1 < -1.0.

17. The optical imaging lens of claim 16, wherein the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens and the total effective focal length f of the optical imaging lens satisfy: 2.0 < (f3+ f5)/f < 3.0.

18. The optical imaging lens of claim 17, wherein an aperture value Fno of the optical imaging lens satisfies: fno is more than or equal to 1.45 and less than or equal to 2.0.

19. The optical imaging lens of claim 16, wherein the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R1 of the object-side surface of the first lens satisfy: 0.5 < R5/R1 < 1.5.

20. The optical imaging lens of claim 16, wherein the radius of curvature R2 of the image side surface of the first lens and the radius of curvature R3 of the object side surface of the second lens satisfy: 1.0 < R2/R3 < 1.5.

21. The optical imaging lens of claim 16, wherein the radius of curvature R4 of the image-side surface of the second lens, 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: -4.5 < (R4+ R6)/R7 < -0.5.

22. The optical imaging lens of claim 16, wherein 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: 1.5 < R9/R8 < 3.5.

23. The optical imaging lens of claim 16, wherein the radius of curvature R11 of the object-side surface of the sixth lens, the radius of curvature R12 of the image-side surface of the sixth lens, and the radius of curvature R13 of the object-side surface of the seventh lens satisfy: 2.5 is less than or equal to (R11+ R13)/R12 is less than 8.0.

24. The optical imaging lens of claim 16, wherein an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 3.5 < T34/(T12+ T23) < 15.

25. The optical imaging lens of claim 16, wherein an air interval T45 of the fourth lens and the fifth lens on the optical axis and an air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 1.5 < T78/T45 < 2.5.

26. The optical imaging lens of claim 16, wherein an air interval T56 of the fifth lens and the sixth lens on the optical axis and an air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: T56/T67 is more than or equal to 5.0 and less than or equal to 43.0.

27. The optical imaging lens of claim 16, wherein the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.0 is less than or equal to CT1/(CT2+ CT3) < 1.5.

28. The optical imaging lens of claim 16, wherein the TV distortion TV of the optical imaging lens satisfies: the | TV | is less than or equal to 2.5 percent.

29. The optical imaging lens of claim 16, wherein the third lens element has a positive optical power, and wherein the object side surface is convex and the image side surface is concave.

30. The optical imaging lens of claim 16, wherein the seventh lens element has a negative power and has a concave object-side surface and a convex image-side surface.