CN211043778U

CN211043778U - Optical imaging system

Info

Publication number: CN211043778U
Application number: CN201921668892.7U
Authority: CN
Inventors: 闻人建科; 孔旭乐; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-07-17
Anticipated expiration: 2029-10-08

Abstract

The application discloses an optical imaging system, which comprises in order from an object side to an image side along an optical axis: a first lens having an optical power; the image side surface of the second lens is a concave surface; a third lens having optical power; a fourth lens having an optical power; a fifth lens having a refractive power, an object-side surface of which is convex; a sixth lens having optical power; a seventh lens having a refractive power, an object side surface of which is convex; an eighth lens having optical power; half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies the Semi-FOV < 30 °.

Description

Optical imaging system

Technical Field

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

Background

In recent years, with the upgrading of consumer electronics and the development of image software functions and video software functions on consumer electronics, the market demand for optical imaging systems suitable for portable electronics is gradually increasing.

It is difficult to provide a zoom imaging system having a large size therein due to the limitation of the size of the body of the portable apparatus. It is therefore common to employ multiple lens groups to achieve photographing of different focal lengths, wherein an optical imaging system serving as a tele end equivalent to a zoom imaging system is generally included.

In order to meet the miniaturization requirement and meet the imaging requirement, an optical imaging system which can achieve both miniaturization and long focal length and large aperture is desired in the market.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging system applicable to portable electronic products that may address, at least in part, at least one of the above-identified deficiencies in the prior art.

The present application provides an optical imaging system, in order from an object side to an image side along an optical axis, comprising: a first lens having an optical power; the image side surface of the second lens can be a concave surface; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having a refractive power, an object side of which may be convex; an eighth lens having optical power.

In one embodiment, the image side surface of the first lens can be convex.

In one embodiment, the second lens may have a negative optical power.

In one embodiment, the object side surface of the fifth lens may be convex.

In one embodiment, half of the Semi-FOV of the maximum field angle of the optical imaging system may satisfy Semi-FOV < 30 °.

In one embodiment, the image side surface of the first lens is convex.

In one embodiment, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy f/EPD ≦ 1.3.

In one embodiment, the maximum effective half caliber DT11 of the object side surface of the first lens and the maximum effective half caliber DT81 of the object side surface of the eighth lens can satisfy DT81/DT11 ≦ 0.87.

In one embodiment, an on-axis distance from the intersection of the object-side surface of the fourth lens and the optical axis to the effective radius vertex of the object-side surface of the fourth lens, SAG41, and an on-axis distance from the intersection of the object-side surface of the third lens and the optical axis to the effective radius vertex of the object-side surface of the third lens, SAG31 may satisfy 0.1 < SAG41/SAG31 < 0.9.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy 0.2 < R4/R3 < 0.8.

In one embodiment, the maximum effective half aperture DT41 of the object side surface of the fourth lens and the maximum effective half aperture DT51 of the object side surface of the fifth lens can satisfy DT51/DT41 < 1.

In one embodiment, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f1 of the first lens can satisfy | R1/f1| ≦ 0.60.

In one embodiment, a distance T56 between the fifth lens and the sixth lens on the optical axis, a distance T67 between the sixth lens and the seventh lens on the optical axis, a distance T78 between the seventh lens and the eighth lens on the optical axis, and a distance TT L between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis may satisfy 0 < (T56+ T67+ T78)/TT L < 0.4.

In one embodiment, a central thickness CT1 of the first lens on the optical axis and a central thickness CT3 of the third lens on the optical axis may satisfy 0.2 < CT3/CT1 < 1.0.

In one embodiment, a central thickness CT4 of the fourth lens on the optical axis and a central thickness CT5 of the fifth lens on the optical axis may satisfy 0.3 < CT5/CT4 < 1.0.

In one embodiment, the radius of curvature R13 of the object side surface of the seventh lens and the total effective focal length f of the optical imaging system may satisfy 0.1 < R13/f < 1.0.

In one embodiment, the distance TT L between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis and the total effective focal length f of the optical imaging system can satisfy TT L/f ≦ 1.18.

In one embodiment, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy 0.5 < | R10/R9| < 1.

This application has adopted eight lens, through the focal power of rational distribution each lens, face type, the center thickness of each lens and the epaxial interval between each lens etc for above-mentioned optical imaging system has at least one beneficial effect such as long focal length, large aperture and miniaturization.

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 configuration diagram of an optical imaging system according to embodiment 1 of the present application; fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system of embodiment 1;

fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application; fig. 4A to 4D 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 system of embodiment 2;

fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application; fig. 6A to 6D 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 system of embodiment 3;

fig. 7 shows a schematic configuration diagram of an optical imaging system 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 system of embodiment 4;

fig. 9 shows a schematic configuration diagram of an optical imaging system 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 system of embodiment 5;

fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application; fig. 12A to 12D 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 system of embodiment 6;

fig. 13 is a schematic structural view showing an optical imaging system according to embodiment 7 of the present application; fig. 14A to 14D 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 system of embodiment 7;

fig. 15 shows a schematic configuration diagram of an optical imaging system according to embodiment 8 of the present application; fig. 16A to 16D 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 system of embodiment 8.

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

In an exemplary embodiment, the first lens may have a positive power or a negative power. Illustratively, the second lens may have a negative optical power. For example, the third lens may have a positive or negative optical power, the fourth lens may have a positive or negative optical power, the fifth lens may have a positive or negative optical power, and the sixth lens may have a positive or negative optical power; the seventh lens may have positive or negative optical power, and the eighth lens may have positive or negative optical power.

In an exemplary implementation, when the image-side surface of the first lens element is convex, the image-side surface of the second lens element is concave, and the object-side surface of the seventh lens element is convex, or when the image-side surface of the second lens element is concave, the object-side surface of the fifth lens element is convex, and the object-side surface of the seventh lens element is convex, it is advantageous to make the power of each lens element appropriate, and to balance and control the aberrations of the optical imaging system.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression Semi-FOV < 30 °, wherein Semi-FOV is half of the maximum field angle of the optical imaging system. Illustratively, the Semi-FOV may satisfy the Semi-FOV < 22.5 °, more specifically, may satisfy the 20.0 ° < Semi-FOV < 22.0 °. The application discloses optical imaging system can be to the clear formation of image of object far away, and then can be used for many lens groups, makes many lens groups have the long focal end at least.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression f/EPD ≦ 1.3, where f is the total effective focal length of the optical imaging system and EPD is the entrance pupil diameter of the optical imaging system. More specifically, f and EPD can satisfy 1.05 < f/EPD ≦ 1.3. By controlling the ratio of the total effective focal length to the entrance pupil diameter of the optical imaging system, the optical imaging system can have a larger aperture, and the light inlet quantity of the optical imaging system is favorably improved, so that the illumination and the imaging quality of the optical imaging system are improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression DT81/DT11 ≦ 0.87, where DT11 is the maximum effective half aperture of the object side surface of the first lens, and DT81 is the maximum effective half aperture of the object side surface of the eighth lens. More specifically, DT11 and DT81 may satisfy 0.7 < DT81/DT11 ≦ 0.87. By controlling the ratio of the maximum effective half aperture of the object side surfaces of the first lens and the eighth lens, the size of the first lens is favorably reduced, and the size of the optical imaging system is effectively reduced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.1 < SAG41/SAG31 < 0.9, where SAG41 is an on-axis distance from an intersection of an object-side surface of the fourth lens and the optical axis to an effective radius vertex of the object-side surface of the fourth lens, and SAG31 is an on-axis distance from an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens. More specifically, SAG41 and SAG31 may satisfy 0.4 < SAG41/SAG31 < 0.6. By controlling the ratio of the rise of the object side surface of the fourth lens to the rise of the object side surface of the third lens, the respective focal powers of the third lens and the fourth lens are favorably controlled, so that the focal powers of the lenses of the optical imaging system are balanced, and the aberration contributed by the lenses is effectively balanced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.2 < R4/R3 < 0.8, where R3 is a radius of curvature of an object-side surface of the second lens and R4 is a radius of curvature of an image-side surface of the second lens. More specifically, R3 and R4 may satisfy 0.53 < R4/R3 < 0.63. The curvature radius ratio of the two mirror surfaces of the second lens is controlled, so that the shape of the second lens is favorably controlled, the second lens has better processing manufacturability, and in addition, the focal power of each lens of the optical imaging system is favorably balanced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression DT51/DT41 < 1, where DT41 is the maximum effective half aperture of the object-side surface of the fourth lens, and DT51 is the maximum effective half aperture of the object-side surface of the fifth lens. More specifically, DT41 and DT51 satisfy 0.80 < DT51/DT41 < 0.95. The control of the ratio of the maximum effective half apertures of the object side surfaces of the fourth lens and the fifth lens is beneficial to controlling the shape of the fourth lens and the shape of the fifth lens, so that the respective processing manufacturability of the fourth lens and the fifth lens is improved, the assembly manufacturability of the optical imaging system is improved, and the improvement of the imaging quality of the optical imaging system is also beneficial.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression | R1/f1| ≦ 0.60, where R1 is a radius of curvature of the object-side surface of the first lens and f1 is an effective focal length of the first lens. More specifically, R1 and f1 satisfy 0.55 < | R1/f1| ≦ 0.60. The curvature radius of the object side surface of the first lens is matched with the effective focal length of the first lens, so that the focal power of the first lens can be controlled, the processing field angle of the first lens can be restrained, and the processing manufacturability of the first lens can be improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0 < (T56+ T67+ T78)/TT L < 0.4, where T56 is a spaced distance of the fifth lens and the sixth lens on the optical axis, T67 is a spaced distance of the sixth lens and the seventh lens on the optical axis, T78 is a spaced distance of the seventh lens and the eighth lens on the optical axis, and TT L is a spaced distance of the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis, more specifically, T56, T67, T78, and TT L may satisfy 0.15 < (T56+ T67+ T78)/TT L < 0.25.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.2 < CT3/CT1 < 1.0, where CT1 is a central thickness of the first lens on an optical axis and CT3 is a central thickness of the third lens on the optical axis. More specifically, CT1 and CT3 satisfy 0.50 < CT3/CT1 < 0.75. The ratio of the center thickness of the third lens to the center thickness of the first lens is controlled, so that the center thickness of the first lens and the center thickness of the third lens are reduced, the total length of the optical imaging system is further reduced, and the size of the optical imaging system is effectively reduced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.3 < CT5/CT4 < 1.0, where CT4 is a central thickness of the fourth lens on the optical axis and CT5 is a central thickness of the fifth lens on the optical axis. More specifically, CT4 and CT5 satisfy 0.55 < CT5/CT4 < 0.85. The ratio of the center thickness of the fifth lens to the center thickness of the fourth lens is controlled, so that the center thickness of the fourth lens and the center thickness of the fifth lens are reduced, the total length of the optical imaging system is further reduced, and the size of the optical imaging system is effectively reduced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.1 < R13/f < 1.0, where R12 is a radius of curvature of an object side surface of the seventh lens, and f is an overall effective focal length of the optical imaging system. More specifically, R13 and f can satisfy 0.45 < R13/f < 0.80. By controlling the ratio of the curvature radius of the object side surface of the seventh lens to the total effective focal length, the shape and focal power of the seventh lens can be effectively controlled, so that the focal power of the seventh lens is matched with the total focal power of the optical imaging system, and further, the focal powers of all the lenses are balanced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression TT L/f ≦ 1.18, where TT L is a distance between an object side surface of the first lens and an imaging surface of the optical imaging system on an optical axis, and f is a total effective focal length of the optical imaging system, more specifically, TT L and f may satisfy 1.09 ≦ TT L/f ≦ 1.18.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < | R10/R9| < 1, where R9 is a radius of curvature of an object-side surface of the fifth lens and R10 is a radius of curvature of an image-side surface of the fifth lens. More specifically, R9 and R10 can satisfy 0.78 < | R10/R9| < 0.87. The control of the ratio of the curvature radii of the two mirror surfaces of the fifth lens is beneficial to controlling the shape of the fifth lens, so that the fifth lens has better processing manufacturability, and in addition, the focal power of the fifth lens can be matched with the total focal power of the optical imaging system.

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

The optical imaging system according to the above-described embodiment of the present application may employ a plurality of lenses, such as the eight lenses 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 volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the processability of the imaging system can be improved, so that the optical imaging system is more favorable for production and processing and can be suitable for portable electronic products. Meanwhile, the optical imaging system further has excellent optical performances such as long focal length, large aperture and miniaturization.

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

However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging system 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 system is not limited to include eight lenses. The optical imaging system may also include other numbers of lenses, if desired.

Specific examples of the optical imaging system that can be applied to the above-described embodiments are further described below with reference to the drawings.

Example 1

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

As shown in fig. 1, the optical imaging system, 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, and a filter E9.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex 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 positive power, and has a convex object-side surface S7 and a concave 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 positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a convex object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The optical imaging system has an imaging plane S19, and light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging plane S19.

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

TABLE 1

In embodiment 1, the value of the total effective focal length f of the optical imaging system is 7.98mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S19 is 8.70mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 3.43mm, and the value of the half Semi-FOV of the maximum field angle is 21.61 °, and the value of the f-number Fno of the optical imaging system is 1.30.

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 term coefficients A that can be used for the aspherical mirror surfaces S1 to S16 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-8.4581E-04

-1.4862E-04

9.9297E-06

-5.0798E-07

-9.9798E-07

2.5979E-07

-3.6451E-08

2.4227E-09

-6.1355E-11

S2

6.3103E-03

4.9251E-04

-2.5899E-04

1.4646E-05

2.2693E-06

-3.0603E-07

1.0603E-08

0.0000E+00

S3

-1.8083E-02

3.8322E-03

3.2383E-04

-3.4201E-04

6.5606E-05

-5.0970E-06

1.2209E-07

1.7279E-09

0.0000E+00

S4

-2.4387E-02

7.1184E-03

-2.1316E-03

4.7043E-04

-7.6618E-05

4.9190E-06

3.7068E-07

-4.9076E-08

0.0000E+00

S5

-5.5888E-04

1.1094E-02

-5.9571E-03

1.6572E-03

-2.4335E-04

1.7641E-05

-4.5972E-07

0.0000E+00

S6

-1.0029E-01

5.0060E-02

-1.6509E-02

3.1216E-03

-1.3973E-04

-4.3524E-05

4.5945E-06

6.0271E-08

0.0000E+00

S7

-9.2730E-03

1.0104E-02

-1.7386E-02

8.6327E-03

-1.8260E-03

1.4119E-04

-1.7086E-07

1.1812E-07

0.0000E+00

S8

1.2192E-01

-4.9273E-02

-6.1404E-03

1.0700E-02

-3.7145E-03

5.4234E-04

-2.1697E-05

-1.0303E-06

0.0000E+00

S9

-5.8760E-02

6.3996E-03

2.1661E-03

-3.9077E-03

1.7098E-03

-3.3384E-04

2.8609E-05

-1.2463E-06

0.0000E+00

S10

-1.1721E-01

6.7508E-02

-1.0632E-01

1.5805E-01

-1.6123E-01

1.0304E-01

-3.9641E-02

8.4024E-03

-7.5697E-04

S11

-2.1902E-02

1.0901E-03

-8.5388E-03

6.6021E-03

-3.0419E-03

6.7900E-04

-4.9182E-05

-5.3913E-07

-1.1116E-07

S12

-2.5838E-02

6.0497E-03

-7.3894E-03

4.3337E-03

-1.5433E-03

2.8918E-04

-2.0239E-05

2.3189E-07

-6.9718E-08

S13

-8.7128E-02

3.9503E-03

5.3564E-03

-1.9759E-03

2.9056E-04

-1.4670E-05

-6.0004E-08

1.4079E-10

-2.4508E-10

S14

-9.2880E-02

1.2841E-02

4.9539E-04

-1.0963E-03

2.4921E-04

-1.8789E-05

-3.2355E-07

9.5551E-08

-2.8418E-09

S15

-5.4844E-02

2.4371E-02

-7.7130E-03

1.1052E-03

-5.2881E-05

-1.3503E-06

1.2587E-07

-2.2431E-09

2.3164E-10

S16

-5.9574E-02

2.1618E-02

-5.5450E-03

7.4377E-04

-4.2553E-05

-9.0272E-07

2.2985E-07

-1.2749E-08

6.1933E-10

TABLE 2

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

Example 2

An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging system according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging system, 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, and a filter E9.

In embodiment 2, the value of the total effective focal length f of the optical imaging system is 7.80mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S19 is 8.80mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 3.43mm, and the value of the half Semi-FOV of the maximum field angle is 21.56 °, and the value of the f-number Fno of the optical imaging system is 1.20.

Table 3 shows a basic parameter table of the optical imaging system of example 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

TABLE 4

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

Example 3

An optical imaging system 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 system according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging system, 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, and a filter E9.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex 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 positive power, and has a convex object-side surface S7 and a concave 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 positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a 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 optical imaging system has an imaging plane S19, and light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging plane S19.

In embodiment 3, the value of the total effective focal length f of the optical imaging system is 7.80mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S19 is 8.80mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 3.43mm, and the value of the half Semi-FOV of the maximum field angle is 21.58 °, and the value of the f-number Fno of the optical imaging system is 1.16.

Table 5 shows a basic parameter table of the optical imaging system of example 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-9.5116E-04

-1.0364E-04

-2.6724E-05

1.6176E-05

-4.7581E-06

7.4833E-07

-7.0579E-08

3.6592E-09

-8.0243E-11

S2

4.3136E-03

7.0713E-04

-2.2207E-04

1.2389E-05

1.1231E-06

-1.5157E-07

4.8449E-09

0.0000E+00

S3

-1.3291E-02

2.5164E-03

1.2074E-04

-1.4763E-04

2.4588E-05

-1.6124E-06

3.4114E-08

-5.5780E-11

2.2166E-11

S4

-1.7510E-02

4.6811E-03

-2.0722E-03

8.3901E-04

-2.8889E-04

7.0070E-05

-1.0908E-05

9.6125E-07

-3.6479E-08

S5

2.0843E-03

6.0969E-03

-3.0395E-03

7.5703E-04

-9.8319E-05

7.0154E-06

-3.2065E-07

1.6285E-08

-1.0409E-09

S6

-6.0892E-02

1.6379E-02

3.2453E-04

-1.7240E-03

5.8372E-04

-8.5639E-05

4.5224E-06

3.7865E-08

0.0000E+00

S7

2.7342E-04

-9.8443E-03

3.7864E-04

1.1102E-03

-2.4538E-04

2.1941E-06

1.5788E-06

1.3412E-07

0.0000E+00

S8

8.9914E-02

-3.1969E-02

-7.2733E-03

7.7723E-03

-2.3699E-03

3.2337E-04

-1.4865E-05

-8.9853E-08

-2.5994E-08

S9

-5.3305E-02

1.2388E-02

-2.2815E-03

-2.7588E-03

1.7946E-03

-3.7699E-04

2.1735E-05

8.4914E-07

8.1684E-10

S10

-9.9136E-02

4.0105E-02

-2.0426E-02

6.2514E-03

-4.1326E-04

-4.3486E-04

1.7381E-04

-2.2779E-05

0.0000E+00

S11

-2.2426E-02

-1.2890E-03

-2.5531E-03

1.4135E-03

-7.9926E-04

2.1792E-04

-1.7138E-05

-2.0121E-07

-3.2140E-08

S12

-3.3264E-02

8.8672E-03

-6.7557E-03

2.9381E-03

-9.0464E-04

1.6814E-04

-1.1800E-05

-1.4099E-08

-2.4558E-08

S13

-6.9077E-02

-1.5093E-02

1.2533E-02

-3.9785E-03

6.8381E-04

-5.5319E-05

1.4116E-06

5.8440E-09

1.1043E-09

S14

-5.8063E-02

-8.2575E-03

8.7559E-03

-3.2731E-03

6.1252E-04

-5.3488E-05

1.5710E-06

1.0517E-08

7.3223E-10

S15

-5.7433E-02

3.2504E-02

-1.2430E-02

2.5058E-03

-2.6284E-04

1.3604E-05

-2.5004E-07

-1.4012E-09

-6.7699E-11

S16

-6.5914E-02

2.6093E-02

-8.1130E-03

1.5621E-03

-1.7443E-04

9.8446E-06

-1.9046E-07

1.3952E-09

-1.7426E-10

TABLE 6

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

Example 4

An optical imaging system 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 system according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging system, 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, and a filter E9.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex 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 concave 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 positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a convex object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The optical imaging system has an imaging plane S19, and light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging plane S19.

In embodiment 4, the value of the total effective focal length f of the optical imaging system is 7.80mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S19 is 8.90mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 3.43mm, and the value of the half Semi-FOV of the maximum field angle is 21.59 °, and the value of the f-number Fno of the optical imaging system is 1.15.

Table 7 shows a basic parameter table of the optical imaging system of example 4 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S16 in example 4₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀And A₂₂Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 7

TABLE 8

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

Example 5

An optical imaging system 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 system according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging system, 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, and a filter E9.

In embodiment 5, the value of the total effective focal length f of the optical imaging system is 7.70mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S19 is 8.90mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 3.43mm, and the value of the half Semi-FOV of the maximum field angle is 21.60 °, and the value of the f-number Fno of the optical imaging system is 1.12.

Table 9 shows a basic parameter table of the optical imaging system of example 5 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Watch 10

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

Example 6

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

As shown in fig. 11, the optical imaging system, 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, and a filter E9.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex 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 positive power, and has a convex object-side surface S7 and a concave 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 positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a convex object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The optical imaging system has an imaging plane S19, and light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging plane S19.

In embodiment 6, the value of the total effective focal length f of the optical imaging system is 7.70mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S19 is 8.90mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 3.43mm, and the value of the half Semi-FOV of the maximum field angle is 21.57 °, and the value of the f-number Fno of the optical imaging system is 1.12.

Table 11 shows a basic parameter table of the optical imaging system of example 6 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 11

TABLE 12

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

Example 7

An optical imaging system according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging system, 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, and a filter E9.

In embodiment 7, the value of the total effective focal length f of the optical imaging system is 7.70mm, the value of the on-axis distance TT L from the object side face S1 of the first lens E1 to the imaging plane S19 is 8.90mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging plane S19 is 3.43mm, and the value of the half Semi-FOV of the maximum field angle is 21.55 °, and the value of the f-number Fno of the optical imaging system is 1.10.

Table 13 shows a basic parameter table of the optical imaging system of example 7 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 14 shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S16 in example 7₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.

Watch 13

TABLE 14

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging system of example 7, which represents the convergent focus deviations of light rays of different wavelengths after passing through the system. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 7. Fig. 14C shows a distortion curve of the optical imaging system of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging system of example 7, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 14A to 14D, the optical imaging system according to embodiment 7 can achieve good imaging quality.

Example 8

An optical imaging system according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic structural view of an optical imaging system according to embodiment 8 of the present application.

As shown in fig. 15, the optical imaging system, 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, and a filter E9.

In embodiment 8, the value of the total effective focal length f of the optical imaging system is 7.54mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S19 is 8.90mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 is 3.43mm, and the value of the half Semi-FOV of the maximum field angle is 21.62 °, and the value of the f-number Fno of the optical imaging system is 1.09.

Table 15 shows a basic parameter table of the optical imaging system of example 8 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 16 shows high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 15

TABLE 16

Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging system of example 8, which represents the convergent focus deviations of light rays of different wavelengths after passing through the system. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 8. Fig. 16C shows a distortion curve of the optical imaging system of embodiment 8, which represents distortion magnitude values corresponding to different angles of view. Fig. 16D shows a chromatic aberration of magnification curve of the optical imaging system of example 8, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 16A to 16D, the optical imaging system according to embodiment 8 can achieve good imaging quality.

In summary, examples 1 to 8 each satisfy the relationship shown in table 17.

Conditional expression (A) example	1	2	3	4	5	6	7	8
									DT81/DT11	0.87	0.83	0.76	0.80	0.79	0.79	0.75	0.75
SAG41/SAG31	0.57	0.56	0.55	0.47	0.54	0.54	0.53	0.49
									R4/R3	0.55	0.55	0.61	0.61	0.57	0.57	0.57	0.60
DT51/DT41	0.90	0.85	0.85	0.85	0.82	0.83	0.84	0.84
									\|R1/f1\|	0.60	0.60	0.57	0.57	0.59	0.58	0.57	0.57
(T56+T67+T78)/TTL	0.24	0.22	0.22	0.21	0.21	0.20	0.19	0.19
									CT3/CT1	0.52	0.58	0.59	0.67	0.66	0.67	0.72	0.71
CT5/CT4	0.80	0.67	0.65	0.56	0.64	0.67	0.65	0.70
									R13/f	0.57	0.53	0.49	0.60	0.58	0.75	0.71	0.78
TTL/f	1.09	1.13	1.13	1.14	1.16	1.16	1.16	1.18
									\|R10/R9\|	0.81	0.85	0.81	0.82	0.82	0.80	0.79	0.79

TABLE 17

The present application also provides an imaging Device, which is provided with an electron sensing element to form an image, wherein the electron sensing element may be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (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 system described above.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The optical imaging system, in order from an object side to an image side along an optical axis, comprises:

a first lens having an optical power;

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

a third lens having optical power;

a fourth lens having an optical power;

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

a sixth lens having optical power;

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

an eighth lens having optical power;

half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies the Semi-FOV < 30 °.

2. The optical imaging system of claim 1, wherein the image side surface of the first lens is convex.

3. The optical imaging system of claim 1, wherein the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy f/EPD ≦ 1.3.

4. The optical imaging system of claim 1, wherein the maximum effective half aperture DT11 of the object-side surface of the first lens and the maximum effective half aperture DT81 of the object-side surface of the eighth lens satisfy DT81/DT11 ≦ 0.87.

5. The optical imaging system of claim 1, wherein an on-axis distance from an intersection of an object-side surface of the fourth lens and the optical axis to an effective radius vertex of an object-side surface of the fourth lens, SAG41, and an on-axis distance from an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of an object-side surface of the third lens, SAG31 satisfy 0.1 < SAG41/SAG31 < 0.9.

6. The optical imaging system of claim 1, wherein a radius of curvature R3 of an object-side surface of the second lens and a radius of curvature R4 of an image-side surface of the second lens satisfy 0.2 < R4/R3 < 0.8.

7. The optical imaging system of claim 1, wherein the maximum effective half aperture DT41 of the object-side surface of the fourth lens and the maximum effective half aperture DT51 of the object-side surface of the fifth lens satisfy DT51/DT41 < 1.

8. The optical imaging system of claim 1, wherein a radius of curvature R1 of the object-side surface of the first lens and an effective focal length f1 of the first lens satisfy | R1/f1| ≦ 0.60.

9. The optical imaging system according to claim 1, wherein a spacing distance T56 on the optical axis of the fifth lens and the sixth lens, a spacing distance T67 on the optical axis of the sixth lens and the seventh lens, a spacing distance T78 on the optical axis of the seventh lens and the eighth lens, and a spacing distance TT L on the optical axis from an object-side surface of the first lens to an imaging surface of the optical imaging system satisfy 0 < (T56+ T67+ T78)/TT L < 0.4.

10. The optical imaging system of claim 1, wherein a central thickness CT1 of the first lens on the optical axis and a central thickness CT3 of the third lens on the optical axis satisfy 0.2 < CT3/CT1 < 1.0.

11. The optical imaging system of claim 1, wherein a central thickness CT4 of the fourth lens on the optical axis and a central thickness CT5 of the fifth lens on the optical axis satisfy 0.3 < CT5/CT4 < 1.0.

12. The optical imaging system of claim 1, wherein a radius of curvature R13 of an object-side surface of the seventh lens and a total effective focal length f of the optical imaging system satisfy 0.1 < R13/f < 1.0.

13. The optical imaging system of claim 1, wherein a distance TT L from an object side surface of the first lens to an imaging surface of the optical imaging system on the optical axis and a total effective focal length f of the optical imaging system satisfy TT L/f ≦ 1.18.

14. The optical imaging system of any of claims 1 to 13, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy 0.5 < | R10/R9| < 1.

15. The optical imaging system, in order from an object side to an image side along an optical axis, comprises:

the image side surface of the first lens is a convex surface;

a second lens having a refractive power, an image-side surface of which is concave;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having optical power;

an eighth lens having optical power;

the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy f/EPD is less than or equal to 1.3.

16. The optical imaging system of claim 15, wherein the object side surface of the fifth lens is convex.

17. The optical imaging system of claim 15, wherein the maximum effective half aperture DT11 of the object-side surface of the first lens and the maximum effective half aperture DT81 of the object-side surface of the eighth lens satisfy DT81/DT11 ≦ 0.87.

18. The optical imaging system of claim 17, wherein a Semi-FOV of a maximum field angle of the optical imaging system satisfies Semi-FOV < 30 °.

19. The optical imaging system of claim 15, wherein an on-axis distance from an intersection of an object-side surface of the fourth lens and the optical axis to an effective radius vertex of an object-side surface of the fourth lens, SAG41, and an on-axis distance from an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of an object-side surface of the third lens, SAG31 satisfies 0.1 < SAG41/SAG31 < 0.9.

20. The optical imaging system of claim 15, wherein a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R4 of the image-side surface of the second lens satisfy 0.2 < R4/R3 < 0.8.

21. The optical imaging system of claim 15, wherein the maximum effective half aperture DT41 of the object-side surface of the fourth lens and the maximum effective half aperture DT51 of the object-side surface of the fifth lens satisfy DT51/DT41 < 1.

22. The optical imaging system of claim 15, wherein a radius of curvature R1 of the object-side surface of the first lens and an effective focal length f1 of the first lens satisfy | R1/f1| ≦ 0.60.

23. The optical imaging system of claim 15, wherein a spacing distance T56 on the optical axis of the fifth lens and the sixth lens, a spacing distance T67 on the optical axis of the sixth lens and the seventh lens, a spacing distance T78 on the optical axis of the seventh lens and the eighth lens, and a spacing distance TT L on the optical axis of an object side surface of the first lens to an imaging surface of the optical imaging system satisfy 0 < (T56+ T67+ T78)/TT L < 0.4.

24. The optical imaging system of claim 15, wherein a central thickness CT1 of the first lens on the optical axis and a central thickness CT3 of the third lens on the optical axis satisfy 0.2 < CT3/CT1 < 1.0.

25. The optical imaging system of claim 15, wherein a central thickness CT4 of the fourth lens on the optical axis and a central thickness CT5 of the fifth lens on the optical axis satisfy 0.3 < CT5/CT4 < 1.0.

26. The optical imaging system of claim 15, wherein a radius of curvature R13 of an object-side surface of the seventh lens and a total effective focal length f of the optical imaging system satisfy 0.1 < R13/f < 1.0.

27. The optical imaging system of claim 15, wherein a distance TT L from an object side surface of the first lens to an imaging surface of the optical imaging system on the optical axis and a total effective focal length f of the optical imaging system satisfy TT L/f ≦ 1.18.

28. The optical imaging system of any of claims 15 to 27, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy 0.5 < | R10/R9| < 1.