CN114397745A

CN114397745A - Optical imaging system

Info

Publication number: CN114397745A
Application number: CN202210049382.1A
Authority: CN
Inventors: 李洋; 王浩; 邢天祥; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-04-26
Anticipated expiration: 2042-01-17
Also published as: CN114397745B

Abstract

The invention provides an optical imaging system. The optical imaging system sequentially comprises from the object side to the imaging side along the optical axis: the first lens is made of glass and has focal power; a second lens having a negative optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having a focal power, the object side of which is convex, and the imaging side of which is concave; a seventh lens having a refractive power, an object side surface of which is concave; wherein, the 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 1.7; the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfies: ImgH >6.5 mm. The invention solves the problem that the optical imaging system in the prior art has high pixel, large aperture and large image surface which are difficult to simultaneously consider.

Description

Optical imaging system

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an optical imaging system.

Background

With the development of science and technology, portable electronic products such as smart phones and tablet computers are rapidly developed, taking smart phones as examples, the specifications of rear main shooting lenses are higher and higher by smart phone terminal manufacturers at present, that is, the requirements on optical imaging systems of the rear main shooting lenses are higher and higher, so that the size is reduced as much as possible, and the miniaturization is met; a higher imaging effect is ensured, which means that a large imaging surface is required; meanwhile, the requirements of different scenes, night shooting and the like are also required to be met. The existing optical imaging system is not easy to balance the requirements of imaging quality, production efficiency, production cost and the like, and brings great challenges to lens manufacturers.

That is, the optical imaging system in the prior art has the problem that high pixels, large aperture and large image plane are difficult to be compatible at the same time.

Disclosure of Invention

The invention mainly aims to provide an optical imaging system to solve the problem that the optical imaging system in the prior art is difficult to simultaneously give consideration to high pixels, large aperture and large image plane.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging system comprising, in order from an object side to an imaging side along an optical axis: the first lens is made of glass and has focal power; a second lens having a negative optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having a focal power, the object side of which is convex, and the imaging side of which is concave; a seventh lens having a refractive power, an object side surface of which is concave; wherein, the 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 1.7; the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfies: ImgH >6.5 mm.

Further, the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0.

Further, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5.

Further, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5.

Further, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the imaging side of the second lens satisfy: 8.0 < (R3+ R4)/(R3-R4) < 9.0.

Further, a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R10 of the imaging side surface of the fifth lens satisfy: 7.5 < R5/R10 < 8.5.

Further, a radius of curvature R8 of the imaging side surface of the fourth lens and a radius of curvature R11 of the object side surface of the sixth lens satisfy: -10.0 < R8/R11 < -9.0.

Further, a curvature radius R9 of the object side surface of the fifth lens and a curvature radius R11 of the object side surface of the sixth lens satisfy: 6.0 < R9/R11 < 7.0.

Further, a radius of curvature R13 of the object side surface of the seventh lens and a radius of curvature R14 of the imaging side surface of the seventh lens satisfy: -6.0 < R14/R13 < -4.5.

Further, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: f2/f5 is more than 6.0 and less than 7.0.

Further, half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies: the Semi-FOV is more than or equal to 40.0 degrees.

Further, an on-axis distance TTL from the object side surface of the first lens to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.3.

According to another aspect of the present invention, there is provided an optical imaging system including, in order from an object side to an imaging side along an optical axis: the first lens is made of glass and has focal power; a second lens having a negative optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having a focal power, the object side of which is convex, and the imaging side of which is concave; a seventh lens having a refractive power, an object side surface of which is concave; wherein the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5; the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfies: ImgH >6.5 mm.

Further, the 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 1.7; the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy that: -8.0 < f2/f < -7.0.

By applying the technical scheme of the invention, the optical imaging system sequentially comprises a first lens with focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with focal power, a fifth lens with focal power, a sixth lens with focal power and a seventh lens with focal power from the object side to the imaging side along the optical axis, wherein the first lens is made of glass; the object side surface of the sixth lens is a convex surface, and the imaging side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a concave surface; wherein, the 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 1.7; the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfies: ImgH >6.5 mm.

By controlling the focal power, the surface type and the material of each lens, the image resolution can be improved, and the optical imaging system can still keep perfect image resolution in a larger temperature change range. The ratio of the effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is restricted within a reasonable range, so that the characteristic of a large aperture of the system can be realized, better image quality can be ensured in a dark environment, and the function of night shooting is realized. By restraining the half of the diagonal length ImgH of the effective pixel area on the imaging surface within a reasonable range, the characteristic of a large image surface of the optical imaging system can be realized, so that the high shooting requirement of a user is met. In addition, the optical imaging system is a seven-piece ultrathin glass-plastic mixed camera lens with high pixels, a large image plane and a large aperture, and can better meet the use requirements of various special scenes.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic configuration diagram showing an optical imaging system according to a first example of the present invention;

fig. 2 to 5 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 in fig. 1;

fig. 6 is a schematic configuration diagram showing an optical imaging system of a second example of the present invention;

fig. 7 to 10 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 in fig. 6;

fig. 11 is a schematic configuration diagram showing an optical imaging system of example three of the present invention;

fig. 12 to 15 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 in fig. 11;

fig. 16 is a schematic configuration diagram showing an optical imaging system of example four of the present invention;

fig. 17 to 20 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 in fig. 16;

fig. 21 is a schematic configuration diagram showing an optical imaging system of example five of the present invention;

fig. 22 to 25 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 in fig. 21;

fig. 26 is a schematic structural view showing an optical imaging system of example six of the present invention;

fig. 27 to 30 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 in fig. 26.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the object side surface of the first lens; s2, the imaging side surface of the first lens; e2, second lens; s3, an object side surface of the second lens; s4, the imaging side surface of the second lens; e3, third lens; s5, an object side surface of the third lens; s6, the imaging side surface of the third lens; e4, fourth lens; s7, an object side surface of the fourth lens; s8, the imaging side surface of the fourth lens; e5, fifth lens; s9, an object side surface of the fifth lens; s10, the imaging side surface of the fifth lens; e6, sixth lens; s11, the object side surface of the sixth lens; s12, an imaging side of the sixth lens; e7, seventh lens; s13, an object side surface of the seventh lens; s14, an imaging side of the seventh lens; e8, optical filters; s15, the object side of the optical filter; s16, imaging side face of the optical filter; and S17, imaging surface.

Detailed Description

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 invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all 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.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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 close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. When the R value is positive, the object side is judged to be convex, and when the R value is negative, the object side is judged to be concave; for the imaged side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

The invention provides an optical imaging system, aiming at solving the problem that an optical imaging system in the prior art is difficult to simultaneously give consideration to high pixels, large aperture and large image plane.

Example one

As shown in fig. 1 to 30, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens having a refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a refractive power, a fifth lens having a refractive power, a sixth lens having a refractive power, and a seventh lens having a refractive power, the material of the first lens being glass; the object side surface of the sixth lens is a convex surface, and the imaging side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a concave surface; wherein, the 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 1.7; the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfies: ImgH >6.5 mm.

In the present embodiment, the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0. The relation between the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens is constrained within a reasonable range, so that the reasonable distribution of the focal power of the second lens is guaranteed, the aberration is reduced, and the imaging quality is improved. Preferably, -7.8 < f2/f < -7.4.

In the present embodiment, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5. By restricting the ratio of the effective focal length f3 of the third lens to the effective focal length f6 of the sixth lens within a reasonable range, the reasonable distribution of the focal powers of the third lens and the sixth lens can be ensured, which is beneficial to reducing aberration and improving imaging quality. Preferably, -8.4 < f3/f6 < -7.9.

In the present embodiment, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5. The conditional expression is satisfied, the distribution of the focal power of the fourth lens and the focal power of the sixth lens can be ensured, the total aberration can be reduced, and the imaging quality can be improved. Preferably, 4.9 < f4/f6 < 5.3.

In the present embodiment, a radius of curvature R3 of the object side surface of the second lens and a radius of curvature R4 of the imaging side surface of the second lens satisfy: 8.0 < (R3+ R4)/(R3-R4) < 9.0. Satisfying the conditional expression, the curvature and the focal power of the second lens can be ensured, the molding processability of the second lens can be improved, and the aberration can be reduced. Preferably 8.3 < (R3+ R4)/(R3-R4) < 8.9.

In the present embodiment, a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R10 of the imaging side surface of the fifth lens satisfy: 7.5 < R5/R10 < 8.5. The curvature of the third lens and the curvature of the fifth lens can be guaranteed by meeting the conditional expression, so that the processability of the third lens and the fifth lens can be guaranteed, off-axis aberration can be reduced, and the imaging quality is improved. Preferably 7.6 < R5/R10 < 8.1.

In the present embodiment, a radius of curvature R8 of the imaging side surface of the fourth lens and a radius of curvature R11 of the object side surface of the sixth lens satisfy: -10.0 < R8/R11 < -9.0. The curvature of the fourth lens and the curvature of the sixth lens can be guaranteed, the processability of the fourth lens and the sixth lens can be guaranteed, off-axis aberration can be reduced, and imaging quality is improved. Preferably, -10.0 < R8/R11 < -9.4.

In the present embodiment, a radius of curvature R9 of the object side surface of the fifth lens and a radius of curvature R11 of the object side surface of the sixth lens satisfy: 6.0 < R9/R11 < 7.0. The curvature of the fifth lens and the curvature of the sixth lens can be guaranteed, the processability of the fifth lens and the sixth lens can be guaranteed, off-axis aberration can be effectively reduced, and imaging quality is guaranteed. Preferably, 6.1 < R9/R11 < 6.6.

In the present embodiment, a radius of curvature R13 of the object side surface of the seventh lens and a radius of curvature R14 of the imaging side surface of the seventh lens satisfy: -6.0 < R14/R13 < -4.5. Satisfying the conditional expression, the curvature and the focal power of the seventh lens can be ensured, the molding processability of the seventh lens can be improved, and the aberration can be reduced. Preferably, -5.6 < R14/R13 < -4.8.

In the present embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: f2/f5 is more than 6.0 and less than 7.0. The condition is satisfied, the reasonable distribution of the focal power of the second lens and the focal power of the fifth lens can be ensured, the aberration is reduced, and the final imaging effect is improved. Preferably, 6.6 < f2/f5 < 6.9.

In the present embodiment, half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies: the Semi-FOV is more than or equal to 40.0 degrees. By restricting the Semi-FOV, which is the maximum field angle of the optical imaging system, to a range of 40.0 ° or more, the obtained object information can be enlarged. Preferably, the Semi-FOV is > 43.0 °.

In the present embodiment, an on-axis distance TTL from the object side surface to the imaging surface of the first lens and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.3. The ratio of the on-axis distance TTL from the object side surface of the first lens to the imaging surface to the half of the diagonal length ImgH of the effective pixel area on the imaging surface is restrained within a reasonable range, so that the whole optical imaging system has a smaller volume, the miniaturization is met, and meanwhile, the appearance attractiveness of the optical imaging system can be improved.

Example two

As shown in fig. 1 to 30, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens having a refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a refractive power, a fifth lens having a refractive power, a sixth lens having a refractive power, and a seventh lens having a refractive power, the material of the first lens being glass; the object side surface of the sixth lens is a convex surface, and the imaging side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a concave surface; wherein the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5; the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfies: ImgH >6.5 mm.

Preferably, -8.4 < f3/f6 < -7.9.

By controlling the focal power, the surface type and the material of each lens, the image resolution can be improved, and the optical imaging system can still keep perfect image resolution in a larger temperature change range. By restricting the ratio of the effective focal length f3 of the third lens to the effective focal length f6 of the sixth lens within a reasonable range, the reasonable distribution of the focal powers of the third lens and the sixth lens can be ensured, which is beneficial to reducing aberration and improving imaging quality. By restraining the half of the diagonal length ImgH of the effective pixel area on the imaging surface within a reasonable range, the characteristic of a large image surface of the optical imaging system can be realized, so that the high shooting requirement of a user is met. In addition, the optical imaging system is a seven-piece ultrathin glass-plastic mixed camera lens with high pixels, a large image plane and a large aperture, and can better meet the use requirements of various special scenes.

In the present embodiment, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.7. The ratio of the effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is restricted within a reasonable range, so that the characteristic of a large aperture of the system can be realized, better image quality can be ensured in a dark environment, and the function of night shooting is realized.

The above optical imaging system may optionally further include a filter for correcting color deviation or a protective glass for protecting the photosensitive element on the imaging surface.

The optical imaging system in the present application may employ a plurality of lenses, such as the seven lenses described above. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, the sensitivity of the lens can be effectively reduced, the machinability of the lens can be improved, and the optical imaging system is more favorable for production and processing and can be suitable for portable electronic equipment such as smart phones. The left side is the object side and the right side is the imaging side.

In the present application, at least one of the mirror surfaces of each 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.

However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging system can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although seven lenses are exemplified in the embodiment, the optical imaging system is not limited to include seven lenses. The optical imaging system may also include other numbers of lenses, as desired.

Examples of specific surface types and parameters applicable to the optical imaging system of the above embodiment are further described below with reference to the drawings.

It should be noted that any one of the following examples one to six is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 5, an optical imaging system of the first example of the present application is described. Fig. 1 shows a schematic diagram of the configuration of an optical imaging system of example one.

As shown in fig. 1, the optical imaging system includes, in order from an object side to an imaging side: 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, a filter E8, and an image forming surface S17.

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

In this example, the total effective focal length f of the optical imaging system is 6.89mm, the Semi-FOV of the maximum field angle of the optical imaging system is 43.7 °, the total length TTL of the optical imaging system is 8.49mm, and the image height ImgH is 6.71 mm.

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

TABLE 1

In example one, the object side surface and the imaging side surface of any one of the first lens E1 to the seventh lens E7 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric 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 gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30, which can be used for each of the aspherical mirrors S1-S14 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.4627E-02

-1.2451E-02

-4.7469E-03

-1.4344E-03

-3.8687E-04

-8.2311E-05

-5.8374E-05

S2

-9.4602E-02

1.3827E-02

-3.0669E-03

3.5439E-04

-1.9258E-04

-2.7130E-04

-1.2410E-04

S3

-4.2235E-02

4.1918E-02

1.4293E-03

2.3381E-03

6.4426E-07

-3.7387E-04

-2.0698E-04

S4

3.0897E-02

1.9594E-02

2.3164E-03

2.1532E-03

8.2548E-04

2.7115E-04

1.2360E-04

S5

-2.3437E-01

-1.1073E-02

1.6089E-03

2.4385E-03

8.0428E-04

3.0334E-04

4.2732E-05

S6

-2.6713E-01

8.7532E-03

8.2226E-03

4.0143E-03

2.7052E-04

-1.6428E-04

-1.5626E-04

S7

-1.8068E-01

2.0311E-02

6.7498E-03

2.9469E-03

1.2940E-04

-1.2994E-04

-1.3694E-04

S8

-3.5541E-01

1.3812E-02

1.1113E-02

8.1436E-03

3.8727E-03

1.9567E-03

3.9297E-04

S9

-1.0813E+00

4.0189E-02

2.8185E-02

4.2837E-02

6.6926E-05

7.4948E-04

-4.0019E-03

S10

-3.5665E+00

5.5053E-01

-1.9759E-01

3.0222E-02

-5.1006E-02

7.4027E-03

-5.1726E-03

S11

-4.2155E+00

5.0920E-01

5.2606E-02

1.4676E-02

-2.9349E-02

1.2902E-02

-1.9661E-03

S12

-6.8823E-01

-5.3622E-01

2.5918E-01

-1.0552E-01

5.8536E-02

-1.9098E-02

1.1389E-02

S13

3.3664E+00

-2.8913E-01

1.7642E-02

3.1968E-02

-5.4501E-02

2.4906E-02

8.1383E-03

S14

-2.7437E+00

4.7802E-01

-1.5472E-02

-1.4868E-02

-1.2901E-02

-1.3822E-02

5.1753E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-4.1451E-05

-4.3007E-05

-1.9739E-05

-1.8246E-05

-1.4780E-05

-1.5208E-05

-2.5994E-06

S2

-5.5273E-05

-1.2541E-05

0.0000E+00

S3

-1.1989E-04

-5.4443E-05

-1.9908E-05

-1.5056E-05

-9.8985E-06

-8.0025E-06

-1.0397E-06

S4

4.0125E-05

1.4392E-05

2.1569E-06

-6.7370E-07

-3.3244E-06

-1.4411E-06

-1.9736E-06

S5

3.3548E-05

-1.0348E-05

1.0675E-05

-4.4693E-06

6.7640E-06

-4.1330E-06

7.3933E-07

S6

-1.1769E-05

-1.9760E-05

1.5026E-06

-3.8818E-06

4.4460E-06

2.1732E-06

-1.9821E-06

S7

1.2046E-05

-2.4799E-05

-5.6302E-06

-3.8701E-06

4.8273E-06

2.1803E-06

1.0041E-06

S8

3.6740E-05

-1.0061E-04

-8.9807E-05

-6.4412E-05

-4.3203E-05

-1.5074E-05

-1.1403E-05

S9

-1.3034E-03

-5.6873E-04

5.8498E-04

6.0765E-04

4.1590E-04

1.4638E-04

5.8158E-05

S10

-7.0234E-04

-2.6120E-03

-2.4864E-04

-3.3925E-04

-1.3400E-04

-1.6635E-04

4.7880E-06

S11

-2.5846E-03

-1.7842E-03

1.7642E-03

1.7440E-04

-1.8240E-04

-1.3996E-04

-6.0510E-05

S12

-2.5300E-03

1.0626E-03

-1.2314E-03

-4.7144E-04

3.4133E-04

-3.0670E-04

3.8811E-05

S13

-1.9592E-02

1.2750E-02

-4.0444E-03

-2.4741E-04

7.0395E-04

-2.1174E-04

-1.0523E-05

S14

-1.1121E-03

6.1649E-03

-5.1509E-03

-1.6256E-04

6.6483E-04

1.8630E-04

-1.9435E-04

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of the optical imaging system of example one, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 3 shows astigmatism curves of the optical imaging system of example one, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the optical imaging system of example one, which represent distortion magnitude values corresponding to different angles of view. Fig. 5 shows a chromatic aberration of magnification curve of the optical imaging system of the first example, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 2 to 5, the optical imaging system of example one can achieve good imaging quality.

Example two

As shown in fig. 6 to 10, an optical imaging system of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 6 shows a schematic diagram of the configuration of an optical imaging system of example two.

As shown in fig. 6, the optical imaging system includes, in order from an object side to an imaging side: 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, a filter E8, and an image forming surface S17.

In this example, the total effective focal length f of the optical imaging system is 6.74mm, the Semi-FOV of the maximum field angle of the optical imaging system is 43.7 °, the total length TTL of the optical imaging system is 8.37mm, and the image height ImgH is 6.50 mm.

Table 3 shows a basic structural parameter table of the optical imaging system of example two, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 3

Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.2474E-02

-1.0740E-02

-3.7871E-03

-1.0715E-03

-2.4105E-04

0.0000E+00

S2

-9.1932E-02

1.3150E-02

-2.6888E-03

5.8422E-04

-3.7714E-05

-1.3878E-04

-3.4018E-05

S3

-4.8478E-02

3.5825E-02

5.9368E-04

1.9871E-03

1.8788E-04

-1.2403E-04

-3.0664E-05

S4

2.6904E-02

1.7572E-02

1.3661E-03

1.4626E-03

4.4845E-04

1.0737E-04

4.8666E-05

S5

-2.2837E-01

-1.1828E-02

8.8478E-04

1.5122E-03

4.8132E-04

8.6143E-05

0.0000E+00

S6

-2.6159E-01

7.9721E-03

7.4076E-03

3.0591E-03

5.0019E-05

-2.6104E-04

-1.6811E-04

S7

-1.8149E-01

2.0548E-02

6.7772E-03

2.6428E-03

1.0029E-04

-9.8723E-05

-1.2286E-04

S8

-3.4862E-01

1.0743E-02

8.5513E-03

7.3692E-03

3.6627E-03

2.0650E-03

5.4008E-04

S9

-9.6214E-01

1.3061E-02

2.5465E-03

2.9520E-02

1.0030E-03

4.0384E-03

-8.5188E-04

S10

-3.2251E+00

5.2033E-01

-1.4869E-01

4.5164E-02

-3.6356E-02

7.8136E-03

-2.1856E-03

S11

-4.1989E+00

5.1147E-01

5.1663E-02

1.5039E-02

-3.0079E-02

1.2722E-02

-2.3564E-03

S12

-6.9759E-01

-5.8202E-01

2.6265E-01

-1.0644E-01

5.9149E-02

-1.8468E-02

1.1943E-02

S13

3.2123E+00

-2.6434E-01

1.4868E-02

3.7052E-02

-5.3239E-02

2.0616E-02

1.1664E-02

S14

-2.6984E+00

4.3751E-01

-4.0522E-03

-1.0510E-02

-1.0525E-02

-1.4101E-02

4.7363E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

-2.2191E-05

6.2603E-06

0.0000E+00

S3

-3.3140E-05

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

5.3749E-05

0.0000E+00

S8

2.1350E-04

3.3824E-05

1.0637E-05

0.0000E+00

S9

-1.1114E-04

-7.1570E-04

-1.8253E-04

-1.1598E-04

1.4609E-06

-4.3528E-05

0.0000E+00

S10

1.3347E-03

-1.0705E-03

2.4461E-04

-4.5171E-05

6.8696E-05

-1.1467E-04

0.0000E+00

S11

-2.4566E-03

-1.3200E-03

2.1674E-03

2.2925E-04

-1.6366E-04

-1.6190E-04

0.0000E+00

S12

-2.8538E-03

9.3898E-04

-1.3900E-03

-3.6379E-04

4.9807E-04

-1.4098E-04

1.4503E-04

S13

-1.9298E-02

1.1334E-02

-2.5501E-03

-6.5126E-04

2.1645E-04

0.0000E+00

S14

-2.4081E-03

6.9613E-03

-4.5631E-03

2.0826E-04

5.5902E-04

1.7969E-04

-3.6629E-04

TABLE 4

Fig. 7 shows an on-axis chromatic aberration curve of the optical imaging system of example two, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 8 shows astigmatism curves of the optical imaging system of example two, which represent meridional field curvature and sagittal field curvature. Fig. 9 shows distortion curves of the optical imaging system of example two, which indicate distortion magnitude values corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the optical imaging system of example two, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 7 to 10, the optical imaging system of example two can achieve good imaging quality.

Example III

As shown in fig. 11 to 15, an optical imaging system of example three of the present application is described. Fig. 11 shows a schematic diagram of the configuration of an optical imaging system of example three.

As shown in fig. 11, the optical imaging system includes, in order from an object side to an imaging side: 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, a filter E8, and an image forming surface S17.

In this example, the total effective focal length f of the optical imaging system is 6.74mm, the Semi-FOV of the maximum field angle of the optical imaging system is 43.7 °, the total length TTL of the optical imaging system is 8.36mm, and the image height ImgH is 6.50 mm.

Table 5 shows a basic structural parameter table of the optical imaging system of example three, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 5

Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.2427E-02

-1.0753E-02

-3.7546E-03

-1.0430E-03

-2.1783E-04

0.0000E+00

S2

-9.1965E-02

1.3162E-02

-2.6993E-03

6.0122E-04

-3.7731E-05

-1.3520E-04

-4.1398E-05

S3

-4.8450E-02

3.5811E-02

5.9472E-04

1.9733E-03

1.8771E-04

-1.2011E-04

-2.1663E-05

S4

2.6891E-02

1.7591E-02

1.3653E-03

1.4611E-03

4.4054E-04

1.0231E-04

4.3816E-05

S5

-2.2836E-01

-1.1846E-02

8.9197E-04

1.5169E-03

4.8933E-04

8.6039E-05

0.0000E+00

S6

-2.6158E-01

7.9892E-03

7.4039E-03

3.0659E-03

5.1457E-05

-2.5840E-04

-1.6625E-04

S7

-1.8149E-01

2.0528E-02

6.7831E-03

2.6366E-03

1.0566E-04

-8.7691E-05

-1.1019E-04

S8

-3.4869E-01

1.0789E-02

8.5478E-03

7.3748E-03

3.6557E-03

2.0602E-03

5.3177E-04

S9

-9.6196E-01

1.2893E-02

2.5648E-03

2.9533E-02

1.0179E-03

4.0343E-03

-8.5366E-04

S10

-3.2251E+00

5.2037E-01

-1.4870E-01

4.5159E-02

-3.6358E-02

7.8157E-03

-2.1834E-03

S11

-4.1989E+00

5.1146E-01

5.1669E-02

1.5041E-02

-3.0079E-02

1.2722E-02

-2.3561E-03

S12

-6.9749E-01

-5.8200E-01

2.6264E-01

-1.0645E-01

5.9142E-02

-1.8468E-02

1.1944E-02

S13

3.2122E+00

-2.6434E-01

1.4863E-02

3.7051E-02

-5.3239E-02

2.0617E-02

1.1666E-02

S14

-2.6983E+00

4.3694E-01

-3.9732E-03

-1.0502E-02

-1.0525E-02

-1.4100E-02

4.7351E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

-2.8360E-05

-4.4927E-06

0.0000E+00

S3

-2.7746E-05

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

5.9364E-05

0.0000E+00

S8

2.0793E-04

2.8382E-05

8.4657E-06

0.0000E+00

S9

-1.1286E-04

-7.1515E-04

-1.8094E-04

-1.1809E-04

-1.6472E-06

-4.2115E-05

0.0000E+00

S10

1.3343E-03

-1.0680E-03

2.5137E-04

-4.6093E-05

7.1673E-05

-1.1270E-04

0.0000E+00

S11

-2.4573E-03

-1.3199E-03

2.1665E-03

2.2877E-04

-1.6397E-04

-1.6199E-04

0.0000E+00

S12

-2.8452E-03

9.2062E-04

-1.3739E-03

-3.6411E-04

5.0035E-04

-1.4217E-04

1.4822E-04

S13

-1.9298E-02

1.1333E-02

-2.5527E-03

-6.5162E-04

2.1752E-04

0.0000E+00

S14

-2.4095E-03

6.9604E-03

-4.5646E-03

2.1011E-04

5.6071E-04

1.7706E-04

-3.6768E-04

TABLE 6

Fig. 12 shows an on-axis chromatic aberration curve of the optical imaging system of example three, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 13 shows astigmatism curves of the optical imaging system of example three, which represent meridional field curvature and sagittal field curvature. Fig. 14 shows distortion curves of the optical imaging system of example three, which represent distortion magnitude values corresponding to different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the optical imaging system of example three, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 12 to 15, the optical imaging system of example three can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an optical imaging system of example four of the present application is described. Fig. 16 shows a schematic diagram of the configuration of an optical imaging system of example four.

As shown in fig. 16, the optical imaging system includes, in order from an object side to an imaging side: 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, a filter E8, and an image forming surface S17.

In this example, the total effective focal length f of the optical imaging system is 6.83mm, the Semi-FOV of the maximum field angle of the optical imaging system is 44.0 °, the total length TTL of the optical imaging system is 8.35mm and the image height ImgH is 6.71 mm.

Table 7 shows a basic structural parameter table of the optical imaging system of example four, in which the unit of the radius of curvature, thickness/distance are millimeters (mm).

TABLE 7

Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-5.0841E-02

-1.5847E-02

-6.1052E-03

-2.1596E-03

-6.7185E-04

-3.2312E-04

-2.0295E-04

S2

-1.0498E-01

1.4307E-02

-5.0837E-03

-5.9285E-04

-1.1268E-03

-7.9752E-04

-3.4256E-04

S3

-3.8786E-02

4.5246E-02

1.8826E-03

2.2241E-03

-3.3916E-04

-6.7238E-04

-3.5373E-04

S4

3.7419E-02

2.3236E-02

3.7855E-03

3.0597E-03

1.1954E-03

4.3001E-04

1.8134E-04

S5

-2.5472E-01

-1.0415E-02

3.7095E-03

3.7307E-03

1.3330E-03

4.8791E-04

1.0011E-04

S6

-2.7762E-01

1.1863E-02

1.0056E-02

4.5409E-03

1.4481E-04

-2.8659E-04

-2.2968E-04

S7

-1.8463E-01

2.2736E-02

7.7485E-03

3.0844E-03

5.7084E-05

-2.1745E-04

-1.6381E-04

S8

-3.5493E-01

1.3866E-02

1.0797E-02

7.9295E-03

3.8655E-03

1.8823E-03

3.4763E-04

S9

-9.9510E-01

1.4885E-02

7.6725E-03

3.4198E-02

1.1961E-03

3.1321E-03

-1.8504E-03

S10

-3.2494E+00

5.2501E-01

-1.5351E-01

4.5210E-02

-3.7593E-02

8.0905E-03

-2.0625E-03

S11

-4.1524E+00

4.8898E-01

5.0932E-02

1.6619E-02

-2.8543E-02

1.2558E-02

-1.4447E-03

S12

-7.2788E-01

-5.3927E-01

2.6850E-01

-1.0621E-01

6.1057E-02

-1.9307E-02

1.1900E-02

S13

3.3087E+00

-2.8138E-01

1.6982E-02

3.3862E-02

-5.4165E-02

2.3529E-02

9.3132E-03

S14

-2.7480E+00

4.7564E-01

-1.5773E-02

-1.5666E-02

-1.3416E-02

-1.3799E-02

5.2896E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.8141E-04

-1.1388E-04

-8.4445E-05

-3.9543E-05

-3.3593E-05

-1.1160E-05

-6.2110E-06

S2

-1.1176E-04

-1.4901E-05

0.0000E+00

S3

-2.1635E-04

-8.6775E-05

-5.3022E-05

-2.5750E-05

-1.8251E-05

3.3071E-07

5.3734E-07

S4

5.1838E-05

9.5855E-06

-8.6409E-06

-1.1989E-05

-1.0478E-05

-5.9619E-06

-3.6506E-06

S5

5.5881E-05

-1.2910E-06

1.5491E-05

-3.3414E-06

6.2429E-06

-5.4508E-06

1.5146E-06

S6

-1.0531E-05

-2.7472E-05

4.1690E-06

-7.3460E-06

7.9615E-06

2.3903E-07

6.3934E-07

S7

1.2095E-05

-2.7487E-05

-6.5636E-06

-6.6856E-07

7.0800E-06

3.1677E-06

1.4517E-07

S8

3.4023E-06

-1.1503E-04

-9.2076E-05

-6.9500E-05

-3.3697E-05

-1.2703E-05

4.3615E-06

S9

-5.9972E-04

-8.2502E-04

-1.1937E-04

5.1246E-05

7.9960E-05

5.3949E-05

1.6368E-05

S10

1.3201E-03

-1.2084E-03

1.2291E-04

0.0000E+00

S11

-2.3655E-03

-1.8765E-03

1.5988E-03

2.4763E-04

-1.2310E-04

-4.0976E-05

-9.3519E-05

S12

-3.0462E-03

5.8962E-04

-1.4783E-03

-5.8083E-04

3.2829E-04

-4.5775E-04

4.5426E-05

S13

-1.9492E-02

1.2253E-02

-3.6848E-03

-3.3751E-04

6.8239E-04

-1.7348E-04

-1.3160E-05

S14

-1.1401E-03

6.0222E-03

-5.2709E-03

-5.1137E-05

7.2225E-04

1.5531E-04

-1.9282E-04

TABLE 8

Fig. 17 shows an on-axis chromatic aberration curve of the optical imaging system of example four, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 18 shows astigmatism curves of the optical imaging system of example four, which represent meridional field curvature and sagittal field curvature. Fig. 19 shows distortion curves of the optical imaging system of example four, which represent distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the optical imaging system of example four, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 17 to 20, the optical imaging system according to example four can achieve good imaging quality.

Example five

As shown in fig. 21 to 25, an optical imaging system of example five of the present application is described. Fig. 21 shows a schematic diagram of the structure of an optical imaging system of example five.

As shown in fig. 21, the optical imaging system includes, in order from an object side to an imaging side: 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, a filter E8, and an image forming surface S17.

In this example, the total effective focal length f of the optical imaging system is 6.89mm, the Semi-FOV of the maximum field angle of the optical imaging system is 43.4 °, the total length TTL of the optical imaging system is 8.49mm, and the image height ImgH is 6.71 mm.

Table 9 shows a basic structural parameter table of the optical imaging system of example five, in which the units of the radius of curvature, thickness/distance are millimeters (mm).

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.4408E-02

-1.2440E-02

-4.7525E-03

-1.5217E-03

-4.9211E-04

-1.8249E-04

-1.2942E-04

S2

-9.4685E-02

1.3855E-02

-3.1685E-03

1.2179E-04

-3.7429E-04

-2.9644E-04

-1.1331E-04

S3

-4.2580E-02

4.1967E-02

1.3671E-03

1.9498E-03

-2.6536E-04

-4.2870E-04

-2.1211E-04

S4

3.0738E-02

1.9682E-02

2.5015E-03

2.1225E-03

7.5264E-04

2.3750E-04

9.9368E-05

S5

-2.3522E-01

-1.1266E-02

1.5555E-03

2.3686E-03

7.6273E-04

2.7277E-04

2.6825E-05

S6

-2.6676E-01

8.7764E-03

8.1672E-03

3.7423E-03

2.3813E-04

-2.0040E-04

-1.7686E-04

S7

-1.8086E-01

2.0253E-02

6.6289E-03

2.7448E-03

2.1652E-04

-1.0421E-04

-1.5948E-04

S8

-3.5598E-01

1.3626E-02

1.1134E-02

8.1018E-03

3.9694E-03

1.9913E-03

3.5832E-04

S9

-1.0816E+00

4.0226E-02

2.8625E-02

4.2083E-02

2.1172E-04

8.1364E-04

-3.9994E-03

S10

-3.5657E+00

5.5049E-01

-1.9716E-01

2.9517E-02

-5.0975E-02

7.2719E-03

-5.2126E-03

S11

-4.2167E+00

5.0889E-01

5.2092E-02

1.5557E-02

-2.9529E-02

1.3280E-02

-2.1354E-03

S12

-6.8189E-01

-5.3563E-01

2.5967E-01

-1.0653E-01

5.8444E-02

-1.9065E-02

1.1317E-02

S13

3.3666E+00

-2.9002E-01

1.7455E-02

3.1825E-02

-5.4515E-02

2.4921E-02

8.5170E-03

S14

-2.7408E+00

4.7334E-01

-1.5073E-02

-1.4666E-02

-1.2712E-02

-1.3771E-02

5.0306E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-8.7516E-05

-6.8937E-05

-3.6270E-05

-2.5775E-05

-1.0088E-05

-4.4393E-06

4.0137E-06

S2

-3.1069E-05

-7.9957E-06

0.0000E+00

S3

-9.7755E-05

-4.3389E-05

-1.3041E-05

-9.1706E-06

-2.8664E-06

-1.7876E-06

1.6942E-06

S4

2.6535E-05

6.9632E-06

-1.2175E-06

-1.0908E-06

-3.2054E-06

4.2044E-07

-5.7800E-07

S5

3.7113E-05

-1.0212E-05

1.3826E-05

-5.8298E-06

6.0015E-06

-5.1068E-06

1.9135E-06

S6

7.1045E-06

-3.1410E-05

2.8670E-06

-8.3024E-06

5.6787E-06

-1.7514E-06

-1.4930E-06

S7

4.4417E-05

-4.4737E-05

-1.0188E-06

-5.8622E-06

1.0673E-05

-7.0295E-07

2.3961E-06

S8

1.8843E-05

-1.3254E-04

-1.1520E-04

-8.2440E-05

-4.6140E-05

-1.4968E-05

-9.6819E-06

S9

-1.2429E-03

-5.2919E-04

5.7342E-04

5.6983E-04

3.8993E-04

1.4344E-04

6.8120E-05

S10

-4.5932E-04

-2.5603E-03

-3.8368E-04

-4.2689E-04

-2.2790E-04

-1.7488E-04

1.1894E-05

S11

-2.2978E-03

-1.5048E-03

2.0660E-03

4.7805E-04

-3.1553E-04

-2.1015E-04

-5.4030E-05

S12

-2.5866E-03

8.6094E-04

-1.1048E-03

-1.8905E-04

3.6089E-04

-1.6410E-04

-3.8835E-05

S13

-1.9668E-02

1.2937E-02

-3.9334E-03

-4.8711E-04

6.1975E-04

5.1937E-05

-1.5967E-04

S14

-1.4554E-03

6.1931E-03

-5.0310E-03

4.5069E-04

7.4876E-04

5.3182E-05

-2.6490E-04

Watch 10

Fig. 22 shows an on-axis chromatic aberration curve of the optical imaging system of example five, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 23 shows astigmatism curves of the optical imaging system of example five, which represent meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves of the optical imaging system of example five, which represent distortion magnitude values corresponding to different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the optical imaging system of example five, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 22 to 25, the optical imaging system according to example five can achieve good imaging quality.

Example six

As shown in fig. 26 to 30, an optical imaging system of example six of the present application is described. Fig. 26 shows a schematic diagram of the configuration of an optical imaging system of example six.

As shown in fig. 26, the optical imaging system includes, in order from an object side to an imaging side: 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, a filter E8, and an image forming surface S17.

In this example, the total effective focal length f of the optical imaging system is 6.90mm, the Semi-FOV of the maximum field angle of the optical imaging system is 43.4 °, the total length TTL of the optical imaging system is 8.50mm, and the image height ImgH is 6.71 mm.

Table 11 shows a basic structural parameter table of the optical imaging system of example six, in which the units of the radius of curvature, thickness/distance are millimeters (mm).

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.4455E-02

-1.2400E-02

-4.8037E-03

-1.5040E-03

-4.7117E-04

-1.3513E-04

-8.6888E-05

S2

-9.4630E-02

1.3846E-02

-3.2473E-03

1.5990E-04

-3.2640E-04

-2.5622E-04

-8.0828E-05

S3

-4.2419E-02

4.2046E-02

1.4892E-03

2.1203E-03

-1.3134E-04

-3.4208E-04

-1.5994E-04

S4

3.0734E-02

1.9727E-02

2.5976E-03

2.1935E-03

8.0921E-04

2.7485E-04

1.2697E-04

S5

-2.3510E-01

-1.1256E-02

1.6030E-03

2.4227E-03

7.9734E-04

2.9479E-04

4.1372E-05

S6

-2.6695E-01

8.7337E-03

8.1383E-03

3.7751E-03

2.5625E-04

-1.8215E-04

-1.6366E-04

S7

-1.8079E-01

2.0308E-02

6.6437E-03

2.7482E-03

2.0912E-04

-1.0922E-04

-1.5747E-04

S8

-3.5611E-01

1.3449E-02

1.1190E-02

8.1198E-03

3.9431E-03

1.9826E-03

3.5809E-04

S9

-1.0815E+00

4.0202E-02

2.8530E-02

4.2278E-02

2.1484E-04

7.8130E-04

-4.0304E-03

S10

-3.5662E+00

5.5050E-01

-1.9733E-01

2.9638E-02

-5.0882E-02

7.2967E-03

-5.1971E-03

S11

-4.2176E+00

5.0853E-01

5.2225E-02

1.5304E-02

-2.9464E-02

1.3287E-02

-2.0501E-03

S12

-6.8414E-01

-5.3470E-01

2.5944E-01

-1.0623E-01

5.8446E-02

-1.9035E-02

1.1331E-02

S13

3.3672E+00

-2.9002E-01

1.7480E-02

3.1859E-02

-5.4501E-02

2.4920E-02

8.4759E-03

S14

-2.7419E+00

4.7380E-01

-1.5061E-02

-1.4775E-02

-1.2739E-02

-1.3790E-02

5.0433E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-4.2948E-05

-3.7061E-05

-1.0005E-05

-7.8121E-06

4.5250E-06

4.9811E-06

9.7102E-06

S2

-1.6414E-05

6.5281E-07

0.0000E+00

S3

-7.8808E-05

-3.7452E-05

-1.8167E-05

-1.4281E-05

-7.1745E-06

-4.1127E-06

9.6716E-07

S4

4.0726E-05

1.6768E-05

3.7867E-06

3.2381E-06

-5.2693E-08

1.7402E-06

-9.6764E-07

S5

4.5637E-05

-5.3456E-06

1.6833E-05

-5.0409E-06

5.6452E-06

-5.6663E-06

2.3683E-06

S6

1.8803E-05

-2.6334E-05

6.8086E-06

-7.6118E-06

6.2172E-06

-2.4168E-06

-1.1941E-06

S7

5.2118E-05

-4.1028E-05

2.7625E-06

-5.2234E-06

1.1473E-05

-4.3503E-07

3.1590E-06

S8

3.5641E-05

-1.1622E-04

-9.9244E-05

-7.3260E-05

-4.0347E-05

-1.3493E-05

-8.7411E-06

S9

-1.2512E-03

-5.1953E-04

5.7038E-04

5.6649E-04

3.8950E-04

1.4895E-04

7.4223E-05

S10

-4.9173E-04

-2.5389E-03

-3.7497E-04

-3.8684E-04

-1.8930E-04

-1.3618E-04

3.0321E-05

S11

-2.3559E-03

-1.5386E-03

2.0013E-03

4.3184E-04

-3.6190E-04

-2.3571E-04

-6.5466E-05

S12

-2.5631E-03

8.8735E-04

-1.1017E-03

-2.1902E-04

3.5230E-04

-1.7137E-04

-2.9205E-05

S13

-1.9679E-02

1.2922E-02

-3.9515E-03

-4.3738E-04

6.1198E-04

1.6522E-05

-1.3211E-04

S14

-1.4472E-03

6.2595E-03

-5.0432E-03

3.7510E-04

7.4037E-04

4.9725E-05

-2.5474E-04

TABLE 12

Fig. 27 shows an on-axis chromatic aberration curve of the optical imaging system of example six, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 28 shows astigmatism curves of the optical imaging system of example six, which represent meridional field curvature and sagittal field curvature. Fig. 29 shows distortion curves of the optical imaging system of example six, which represent distortion magnitude values corresponding to different angles of view. Fig. 30 shows a chromatic aberration of magnification curve of the optical imaging system of example six, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 27 to 30, the optical imaging system according to example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Conditional formula/example	1	2	3	4	5	6
							ImgH	6.71	6.50	6.50	6.71	6.71	6.71
f/EPD	1.62	1.60	1.70	1.60	1.67	1.67
							f2/f	-7.46	-7.74	-7.74	-7.71	-7.59	-7.52
f3/f6	-8.22	-8.02	-8.02	-8.33	-7.95	-8.00
							f4/f6	5.22	4.94	4.94	5.21	5.10	5.12
(R3+R4)/(R3-R4)	8.37	8.86	8.86	8.69	8.57	8.49
							R5/R10	7.99	7.65	7.64	7.88	8.06	8.03
R7/R10	7.97	7.39	7.39	7.83	7.78	7.79
							R8/R11	-9.82	-9.45	-9.45	-9.92	-9.61	-9.65
R9/R11	6.17	6.50	6.50	6.28	6.25	6.23
							R14/R13	-5.58	-4.87	-4.86	-5.49	-5.31	-5.34
f2/f5	6.64	6.86	6.87	6.84	6.78	6.71
							Semi-FOV	43.7	43.7	43.7	44.0	43.4	43.4
TTL/ImgH	1.26	1.29	1.29	1.24	1.27	1.27

Watch 13

Table 14 gives effective focal lengths f of the optical imaging systems of example one to example six, effective focal lengths f1 to f7 of the respective lenses, and the like.

Parameter/example	1	2	3	4	5	6
							f(mm)	6.89	6.74	6.74	6.83	6.89	6.90
f1(mm)	8.24	8.22	8.22	8.24	8.24	8.24
							f2(mm)	-51.46	-52.20	-52.20	-52.61	-52.31	-51.86
f3(mm)	-32.57	-31.76	-31.76	-33.01	-31.51	-31.71
							f4(mm)	20.68	19.58	19.57	20.63	20.21	20.28
f5(mm)	-7.75	-7.60	-7.60	-7.69	-7.72	-7.73
							f6(mm)	3.96	3.96	3.96	3.96	3.96	3.96
f7(mm)	-4.86	-4.85	-4.85	-4.86	-4.85	-4.85
							TTL(mm)	8.49	8.37	8.36	8.35	8.49	8.50
ImgH(mm)	6.71	6.50	6.50	6.71	6.71	6.71
							Semi-FOV(°)	43.7	43.7	43.7	44.0	43.4	43.4

TABLE 14

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 system described above.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

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

a first lens having optical power, the material of the first lens being glass;

a second lens having a negative optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having a focal power, the object side of which is convex, and the imaging side of which is concave;

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

wherein an effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD is less than 1.7; the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfies: ImgH >6.5 mm.

2. The optical imaging system of claim 1, wherein an effective focal length f2 of the optical imaging system and an effective focal length f of the second lens satisfy: -8.0 < f2/f < -7.0.

3. The optical imaging system of claim 1, wherein an effective focal length f3 of the third lens and an effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5.

4. The optical imaging system of claim 1, wherein an effective focal length f4 of the fourth lens and an effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5.

5. The optical imaging system of claim 1, wherein a radius of curvature R3 of the object side surface of the second lens and a radius of curvature R4 of the imaging side surface of the second lens satisfy: 8.0 < (R3+ R4)/(R3-R4) < 9.0.

6. The optical imaging system according to claim 1, wherein a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R10 of an imaging-side surface of the fifth lens satisfy: 7.5 < R5/R10 < 8.5.

7. The optical imaging system according to claim 1, wherein a radius of curvature R8 of an imaging side surface of the fourth lens and a radius of curvature R11 of an object side surface of the sixth lens satisfy: -10.0 < R8/R11 < -9.0.

8. The optical imaging system according to claim 1, wherein a radius of curvature R9 of the object side surface of the fifth lens and a radius of curvature R11 of the object side surface of the sixth lens satisfy: 6.0 < R9/R11 < 7.0.

9. The optical imaging system of claim 1, wherein a radius of curvature R13 of the object side surface of the seventh lens and a radius of curvature R14 of the imaging side surface of the seventh lens satisfy: -6.0 < R14/R13 < -4.5.

10. An optical imaging system, comprising, in order from an object side to an imaging side along an optical axis:

a first lens having optical power, the material of the first lens being glass;

a second lens having a negative optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

wherein an effective focal length f3 of the third lens and an effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5; the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfies: ImgH >6.5 mm.