CN114527557A

CN114527557A - Imaging system

Info

Publication number: CN114527557A
Application number: CN202210213249.5A
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: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-05-24
Anticipated expiration: 2042-03-04
Also published as: CN114527557B

Abstract

The invention provides an imaging system, which comprises a light inlet side and a light outlet side from the light inlet side to the light outlet side of the imaging system: the first lens is made of glass material; a second lens; a third lens having positive optical power; a fourth lens having a focal power; the surface of the fifth lens facing the light inlet side is a concave surface, and the surface of the fifth lens facing the light outlet side is a convex surface; a sixth lens having a negative refractive power; the surface of the seventh lens facing the light inlet side is a concave surface, and the surface of the seventh lens facing the light outlet side is a convex surface; an eighth lens having a focal power; the surface of the ninth lens facing to the light-emitting side is a convex surface; wherein, half ImgH of the diagonal length of the effective pixel area on the imaging surface of the imaging system and the on-axis distance TTL from the surface of the first lens facing the light incident side to the imaging surface satisfy: TTL/ImgH is less than 1.3. The invention solves the problem of poor performance of the imaging system in the prior art.

Description

Imaging system

Technical Field

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

Background

In recent years, the popularity of mobile terminal photographing technology is greatly determined, high-pixel, large-aperture and ultrathin lenses are clear in photographing, the appearance is good and becomes a hot spot for manufacturers to pursue, the high-pixel means that the photographing is clearer, the large-aperture is in a dark room or at night, the photographing performance of the environment with smaller illumination is better, the ultrathin mobile phone lens and the mobile phone can be better integrated, the camera part cannot be protruded, and the whole effect is better. While the performance of current imaging systems is not very good.

That is, the imaging system in the prior art has a problem of poor performance.

Disclosure of Invention

The invention mainly aims to provide an imaging system to solve the problem of poor performance of the imaging system in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging system comprising, from an entrance side of the imaging system to an exit side of the imaging system: the first lens is made of glass materials; a second lens having an optical power; a third lens having a positive optical power; a fourth lens having an optical power; the surface of the fifth lens facing the light inlet side is a concave surface, and the surface of the fifth lens facing the light outlet side is a convex surface; a sixth lens having a negative optical power; the surface of the seventh lens facing the light inlet side is a concave surface, and the surface of the seventh lens facing the light outlet side is a convex surface; an eighth lens having optical power; the surface of the ninth lens facing to the light-emitting side is a convex surface; wherein, half ImgH of the diagonal length of the effective pixel area on the imaging surface of the imaging system and the on-axis distance TTL from the surface of the first lens facing the light incident side to the imaging surface satisfy: TTL/ImgH is less than 1.3.

Further, the effective focal length f of the imaging system and the entrance pupil diameter EPD of the imaging system satisfy: f/EPD is less than or equal to 1.8.

Further, an on-axis distance TTL from a surface of the first lens element facing the light incident side to the imaging plane and an effective focal length f of the imaging system satisfy: TTL/f is less than 1.3.

Further, the maximum field angle FOV of the imaging system satisfies: FOV > 80 deg.

Further, the effective focal length f of the imaging system satisfies: f is more than 8.0 mm.

Further, the curvature radius R1 of the surface of the first lens facing the light-in side and the curvature radius R2 of the surface of the first lens facing the light-out side satisfy that: 1.5 < (R2+ R1)/(R2-R1) < 2.0.

Further, the effective focal length f2 of the second lens, the curvature radius R3 of the surface of the second lens facing the light-in side and the curvature radius R4 of the surface of the second lens facing the light-out side satisfy: f2/(R3+ R4) < -2.5 is more than or equal to-4.0.

Further, the effective focal length f3 of the third lens and the curvature radius R5 of the surface of the third lens facing the light inlet side satisfy: f3/R5 is more than 3.5 and less than 6.0.

Further, an effective focal length f7 of the seventh lens and an effective focal length f8 of the eighth lens satisfy: 11.0 < f7/f8 < -7.0.

Further, an effective focal length f6 of the sixth lens and an effective focal length f9 of the ninth lens satisfy: 4.5 < f6/f9 < 6.0.

Further, the curvature radius R4 of the surface of the second lens facing the light-out side and the curvature radius R5 of the surface of the third lens facing the light-in side satisfy that: 2.0 < R5/R4 < 5.0.

Further, the curvature radius R8 of the surface of the fourth lens facing the light-out side and the curvature radius R9 of the surface of the fifth lens facing the light-in side satisfy that: 1.5 < R8/R9 < 2.5.

Further, the curvature radius R10 of the surface of the fifth lens facing the light-out side and the curvature radius R11 of the surface of the sixth lens facing the light-in side satisfy that: -3.0 < R11/R10 < -1.0.

Further, the curvature radius R12 of the surface of the sixth lens facing the light-out side and the curvature radius R13 of the surface of the seventh lens facing the light-in side satisfy that: -1.5 < R13/R12 < -1.0.

Further, the curvature radius R14 of the surface of the seventh lens facing the light-out side and the curvature radius R15 of the surface of the eighth lens facing the light-in side satisfy that: -12.0 < R14/R15 < -8.5.

Further, the curvature radius R11 of the surface of the sixth lens facing the light-in side and the curvature radius R12 of the surface of the sixth lens facing the light-out side satisfy that: 2.0 < R11/R12 < 3.5.

Further, the seventh lens and the eighth lens satisfy, between an air interval T78 on the optical axis of the imaging system, an air interval T89 on the optical axis of the eighth lens and the ninth lens: 7.0 < T89/T78 < 10.5.

Further, an edge thickness ET9 of the ninth lens and a center thickness CT9 of the ninth lens on an optical axis of the imaging system satisfy: 0.5 < ET9/CT9 < 2.0.

According to another aspect of the present invention, there is provided an imaging system, comprising from a light-in side of the imaging system to a light-out side of the imaging system: the first lens is made of glass materials; a second lens having an optical power; a third lens having a positive optical power; a fourth lens having an optical power; the surface of the fifth lens facing the light inlet side is a concave surface, and the surface of the fifth lens facing the light outlet side is a convex surface; a sixth lens having a negative optical power; the surface of the seventh lens facing the light inlet side is a concave surface, and the surface of the seventh lens facing the light outlet side is a convex surface; an eighth lens having optical power; the surface of the ninth lens facing to the light-emitting side is a convex surface; wherein, satisfy between the on-axis distance TTL of the surface of first lens orientation income light side to imaging system's imaging surface and imaging system's effective focal length f: TTL/f is less than 1.3.

By applying the technical scheme of the invention, the optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens from the light-in side of the imaging system to the light-out side of the imaging system. The first lens has focal power, and the material of the first lens is a glass material; the second lens has focal power; the third lens has positive focal power; the fourth lens has focal power; the fifth lens has focal power, the surface of the fifth lens facing the light inlet side is a concave surface, and the surface of the fifth lens facing the light outlet side is a convex surface; the sixth lens has negative focal power; the seventh lens has focal power, the surface of the seventh lens facing the light inlet side is a concave surface, and the surface of the seventh lens facing the light outlet side is a convex surface; the eighth lens has focal power; the ninth lens has focal power, and the surface of the ninth lens facing to the light emergent side is a convex surface; wherein, half ImgH of the diagonal length of the effective pixel area on the imaging surface of the imaging system and the on-axis distance TTL from the surface of the first lens facing the light incident side to the imaging surface satisfy: TTL/ImgH is less than 1.3.

One of the nine lenses is set to be a glass lens, so that the influence of the ambient temperature on the lens can be reduced, the deformation of the lens is reduced, higher resolving power is obtained, and the imaging quality of an imaging system is ensured. By distributing the focal power of part of the lenses of the imaging system and designing the surface type of the lenses, the low-order aberration of the imaging system can be effectively balanced, meanwhile, the tolerance sensitivity of the imaging system can be reduced, the imaging quality of the imaging system is guaranteed while the miniaturization of the imaging system is kept, and the imaging system has the characteristics of large image plane, ultra-thinness and large aperture. And the imaging quality of the imaging system can be ensured by adopting the nine-piece imaging system. By limiting TTL/ImgH within a reasonable range, the ultra-thin characteristic of the imaging system can be ensured, and the miniaturization of the imaging system is facilitated.

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 shows a schematic configuration diagram of an imaging system of example one of the present invention;

FIGS. 2-5 illustrate an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system of FIG. 1;

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

FIGS. 7-10 illustrate on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the imaging system of FIG. 6;

fig. 11 is a schematic configuration diagram showing an 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 imaging system in fig. 11;

fig. 16 is a schematic configuration diagram showing an 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 magnification chromatic aberration curve of the imaging system in fig. 16, respectively;

fig. 21 is a schematic structural view showing an 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 imaging system in fig. 21;

fig. 26 is a schematic structural view showing an 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 imaging system in fig. 26.

Wherein the figures include the following reference numerals:

e1, first lens; s1, the surface of the first lens facing the light incidence side; s2, the surface of the first lens facing the light-emitting side; e2, second lens; s3, the surface of the second lens facing the light incidence side; s4, the surface of the second lens facing the light-emitting side; e3, third lens; s5, the surface of the third lens facing the light incidence side; s6, the surface of the third lens facing the light-emitting side; e4, fourth lens; s7, the surface of the fourth lens facing the light incidence side; s8, the surface of the fourth lens facing the light-emitting side; e5, fifth lens; s9, the surface of the fifth lens facing the light incidence side; s10, the surface of the fifth lens facing the light-emitting side; e6, sixth lens; s11, the surface of the sixth lens facing the light incidence side; s12, the surface of the sixth lens facing the light-emitting side; e7, seventh lens; s13, the surface of the seventh lens facing the light incidence side; s14, the surface of the seventh lens facing the light-emitting side; e8, eighth lens; s15, the surface of the eighth lens facing the light incidence side; s16, the surface of the eighth lens facing the light-emitting side; e9, ninth lens; s17, the surface of the ninth lens facing the light incidence side; s18, the surface of the ninth lens facing the light-emitting side; e10, a filter plate; s19, the surface of the filter plate facing to the light incident side; s20, the surface of the filter plate facing the light-emitting side; and S21, 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 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. With respect to the surface facing the light incident side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; with respect to the surface facing the light exit side, a concave surface is determined when the R value is positive, and a convex surface is determined when the R value is negative.

The invention provides an imaging system, aiming at solving the problem of poor performance of the imaging system in the prior art.

Example one

As shown in fig. 1 to 30, the lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens from the light-in side of the imaging system to the light-out side of the imaging system. The first lens has focal power, and the material of the first lens is a glass material; the second lens has focal power; the third lens has positive focal power; the fourth lens has focal power; the fifth lens has focal power, the surface of the fifth lens facing the light inlet side is a concave surface, and the surface of the fifth lens facing the light outlet side is a convex surface; the sixth lens has negative focal power; the seventh lens has focal power, the surface of the seventh lens facing the light inlet side is a concave surface, and the surface of the seventh lens facing the light outlet side is a convex surface; the eighth lens has focal power; the ninth lens has focal power, and the surface of the ninth lens facing to the light emergent side is a convex surface; wherein, half ImgH of the diagonal length of the effective pixel area on the imaging surface of the imaging system and the on-axis distance TTL from the surface of the first lens facing the light incident side to the imaging surface satisfy: TTL/ImgH is less than 1.3.

Preferably, the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the imaging system and the on-axis distance TTL from the surface of the first lens facing the light incident side to the imaging surface satisfy: TTL/ImgH is more than 1 and less than 1.25.

In the present embodiment, the effective focal length f of the imaging system and the entrance pupil diameter EPD of the imaging system satisfy: f/EPD is less than or equal to 1.8. By limiting the ratio of the focal length to the entrance pupil diameter of the imaging system within a certain range, the characteristic of a large aperture of the imaging system can be ensured to ensure the luminous flux of the imaging system. Preferably, 1.5 < f/EPD ≦ 1.8.

In this embodiment, an on-axis distance TTL from a surface of the first lens element facing the light incident side to the imaging plane and an effective focal length f of the imaging system satisfy: TTL/f is less than 1.3. The ratio of the distance between the surface of the first lens facing the light incidence side and the imaging surface on the axis to the effective focal length of the imaging system is controlled within a certain range, and the ultra-thin characteristic can be realized, so that the assembly of the imaging system is facilitated. Preferably, 1 < TTL/f < 1.28.

In the present embodiment, the maximum field angle FOV of the imaging system satisfies: FOV > 80 deg. The maximum field angle of the imaging system is controlled to be larger than 80 degrees, so that the range which can be shot by the imaging system is larger. Preferably, 85 ° < FOV < 95 °.

In the present embodiment, the effective focal length f of the imaging system satisfies: f is more than 8.0 mm. The effective focal length of the imaging system is controlled to be larger than 8mm, so that the imaging system can shoot a farther object more clearly. Preferably, 8.0mm < f < 9.0 mm.

In the present embodiment, the radius of curvature R1 of the surface of the first lens facing the light-entering side and the radius of curvature R2 of the surface of the first lens facing the light-exiting side satisfy: 1.5 < (R2+ R1)/(R2-R1) < 2.0. By controlling (R2+ R1)/(R2-R1) within a reasonable range, the processability of the first lens can be ensured, the aberration of the imaging system is reduced, and the imaging quality of the imaging system is improved. Preferably 1.6 < (R2+ R1)/(R2-R1) < 1.9.

In the present embodiment, the effective focal length f2 of the second lens, the curvature radius R3 of the surface of the second lens facing the light-in side, and the curvature radius R4 of the surface of the second lens facing the light-out side satisfy: f2/(R3+ R4) < -2.5 is more than or equal to-4.0. By controlling f2/(R3+ R4) within a reasonable range, the optical power distribution of the second lens can be ensured within a reasonable range, thereby improving the imaging quality of the imaging system and enabling the imaging system to realize clear shooting. Preferably-4.0 ≦ f2/(R3+ R4) < -2.7.

In the present embodiment, the effective focal length f3 of the third lens and the curvature radius R5 of the surface of the third lens facing the light incident side satisfy: f3/R5 is more than 3.5 and less than 6.0. By limiting f3/R5 within a reasonable range, the optical power distribution of the third lens is ensured within a reasonable range, and the imaging quality of the imaging system is improved. Preferably, 3.6 < f3/R5 < 5.9.

In the present embodiment, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 11.0 < f7/f8 < -7.0. The ratio of the effective focal length of the seventh lens to the effective focal length of the eighth lens is controlled within a certain range, so that the focal power distribution of the seventh lens and the focal power distribution of the eighth lens can be ensured within a reasonable range, and the imaging quality is improved. Preferably, -10.9 < f7/f8 < -7.1.

In the present embodiment, the effective focal length f6 of the sixth lens and the effective focal length f9 of the ninth lens satisfy: 4.5 < f6/f9 < 6.0. The ratio of the effective focal length of the sixth lens to the effective focal length of the seventh lens is controlled within a certain range, so that the focal power distribution of the sixth lens and the seventh lens can be ensured within a reasonable range, and the imaging quality of the imaging system is improved. Preferably, 4.5 < f6/f9 < 5.9.

In the present embodiment, the radius of curvature R4 of the surface of the second lens facing the light exit side and the radius of curvature R5 of the surface of the third lens facing the light entrance side satisfy: 2.0 < R5/R4 < 5.0. The ratio of the curvature radius of the surface of the second lens facing the light emitting side to the curvature radius of the surface of the third lens facing the light incident side is controlled within a certain range, so that the shape of the third lens and the shape of the second lens can be ensured, and better processability is realized. Preferably, 2.1 < R5/R4 < 4.9.

In the present embodiment, the radius of curvature R8 of the surface of the fourth lens facing the light exit side and the radius of curvature R9 of the surface of the fifth lens facing the light entrance side satisfy: 1.5 < R8/R9 < 2.5. The ratio of the curvature radius of the surface of the fourth lens facing the light emitting side to the curvature radius of the surface of the fifth lens facing the light incident side is controlled within a certain range, so that the shape of the fourth lens and the shape of the fifth lens can be ensured, and the fourth lens and the fifth lens can be conveniently machined. Preferably, 1.55 < R8/R9 < 2.3.

In the present embodiment, the radius of curvature R10 of the surface of the fifth lens facing the light exit side and the radius of curvature R11 of the surface of the sixth lens facing the light entrance side satisfy: -3.0 < R11/R10 < -1.0. The ratio of the curvature radius of the surface of the fifth lens facing the light emitting side to the curvature radius of the surface of the sixth lens facing the light incident side is controlled within a certain range, so that the shape of the fifth lens and the shape of the sixth lens can be ensured, and better processability is realized. Preferably, -2.8 < R11/R10 < -1.2.

In the present embodiment, the radius of curvature R12 of the surface of the sixth lens facing the light exit side and the radius of curvature R13 of the surface of the seventh lens facing the light entrance side satisfy: -1.5 < R13/R12 < -1.0. The ratio of the curvature radius of the surface of the sixth lens facing the light emitting side to the curvature radius of the surface of the seventh lens facing the light incident side is controlled within a certain range, so that the shape of the sixth lens and the shape of the seventh lens can be ensured, and better processability is realized. Preferably, -1.45 < R13/R12 < -1.1.

The curvature radius R14 of the surface of the seventh lens facing the light-out side and the curvature radius R15 of the surface of the eighth lens facing the light-in side satisfy the following conditions: -12.0 < R14/R15 < -8.5. The ratio of the curvature radius of the surface of the seventh lens facing the light emitting side to the curvature radius of the surface of the eighth lens facing the light incident side is controlled within a certain range, so that the shape of the seventh lens and the shape of the eighth lens can be ensured, and better processability is realized. Preferably, -11.8 < R14/R15 < -8.6.

In the present embodiment, a curvature radius R11 of a surface of the sixth lens facing the light incident side and a curvature radius R12 of a surface of the sixth lens facing the light exiting side satisfy: 2.0 < R11/R12 < 3.5. The ratio of the curvature radius of the surface of the sixth lens facing the light-in side to the curvature radius of the surface of the sixth lens facing the light-out side is controlled within a certain range, so that the shape of the sixth lens can be ensured, and better processability is realized. Preferably, 2.1 < R11/R12 < 3.45.

In the present embodiment, the air interval T78 of the seventh lens and the eighth lens on the optical axis of the imaging system, and the air interval T89 of the eighth lens and the ninth lens on the optical axis satisfy: 7.0 < T89/T78 < 10.5. The air interval of the seventh lens and the eighth lens on the optical axis and the air interval of the eighth lens and the ninth lens on the optical axis are controlled to be in a certain range, so that the distance between the seventh lens and the eighth lens and the distance between the eighth lens and the ninth lens can be ensured, and the subsequent assembly is more convenient. Preferably, 7.1 < T89/T78 < 10.3.

In the present embodiment, the edge thickness ET9 of the ninth lens and the center thickness CT9 of the ninth lens on the optical axis of the imaging system satisfy: 0.5 < ET9/CT9 < 2.0. The edge thickness of the ninth lens and the center thickness of the ninth lens on the optical axis are controlled within a certain range, which is beneficial to the molding of the ninth lens. Preferably, 0.6 < ET9/CT9 < 1.8.

Example two

As shown in fig. 1 to 30, the lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens from the light-in side of the imaging system to the light-out side of the imaging system. The first lens has focal power, and the material of the first lens is glass material; the second lens has focal power; the third lens has positive focal power; the fourth lens has focal power; the fifth lens has focal power, the surface of the fifth lens facing the light inlet side is a concave surface, and the surface of the fifth lens facing the light outlet side is a convex surface; the sixth lens has negative focal power; the seventh lens has focal power, the surface of the seventh lens facing the light inlet side is a concave surface, and the surface of the seventh lens facing the light outlet side is a convex surface; the eighth lens has focal power; the ninth lens has focal power, and the surface of the ninth lens facing to the light emergent side is a convex surface; wherein, satisfy between the on-axis distance TTL of the surface of first lens orientation income light side to imaging system's imaging surface and imaging system's effective focal length f: TTL/f is less than 1.3.

One of the nine lenses is set to be a glass lens, so that the influence of the ambient temperature on the lens can be reduced, the deformation of the lens is reduced, higher resolving power is obtained, and the imaging quality of an imaging system is ensured. By distributing the focal power of part of the lenses of the imaging system and designing the surface type of the lenses, the low-order aberration of the imaging system can be effectively balanced, meanwhile, the tolerance sensitivity of the imaging system can be reduced, the imaging quality of the imaging system is guaranteed while the miniaturization of the imaging system is kept, and the imaging system has the characteristics of large image plane, ultra-thinness and large aperture. And the imaging quality of the imaging system can be ensured by adopting the nine-piece imaging system. The ratio of the distance from the surface of the first lens facing the light incidence side to the axis of the imaging surface to the effective focal length of the imaging system is controlled within a certain range, the ultra-thin characteristic can be realized, and the assembly of the imaging system is facilitated.

Preferably, an on-axis distance TTL from a surface of the first lens facing the light incident side to an imaging plane of the imaging system and an effective focal length f of the imaging system satisfy: TTL/f is more than 1 and less than 1.28.

In the present embodiment, the effective focal length f2 of the second lens, the curvature radius R3 of the surface of the second lens facing the light-in side, and the curvature radius R4 of the surface of the second lens facing the light-out side satisfy: f2/(R3+ R4) < -2.5 is more than or equal to-4.0. By controlling f2/(R3+ R4) within a reasonable range, the optical power distribution of the second lens can be ensured within a reasonable range, thereby improving the imaging quality of the imaging system and realizing clear shooting by the imaging system. Preferably-4.0 ≦ f2/(R3+ R4) < -2.7.

In the present embodiment, the radius of curvature R14 of the surface of the seventh lens facing the light exit side and the radius of curvature R15 of the surface of the eighth lens facing the light entrance side satisfy: -12.0 < R14/R15 < -8.5. The ratio of the curvature radius of the surface of the seventh lens facing the light emitting side to the curvature radius of the surface of the eighth lens facing the light incident side is controlled within a certain range, so that the shape of the seventh lens and the shape of the eighth lens can be ensured, and better processability is realized. Preferably, -11.8 < R14/R15 < -8.6.

In the present embodiment, the radius of curvature R11 of the surface of the sixth lens facing the light incident side and the radius of curvature R12 of the surface of the sixth lens facing the light exiting side satisfy: 2.0 < R11/R12 < 3.5. The ratio of the curvature radius of the surface of the sixth lens facing the light-in side to the curvature radius of the surface of the sixth lens facing the light-out side is controlled within a certain range, so that the shape of the sixth lens can be ensured, and better processability is realized. Preferably, 2.1 < R11/R12 < 3.45.

Optionally, the above-described imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface.

The imaging system in the present application may employ a plurality of lenses, such as the nine 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 imaging quality of the imaging system can be effectively improved, the sensitivity of the imaging system is reduced, and the processability of the imaging system is improved, so that the imaging system is more favorable for production and processing and can be suitable for portable electronic equipment such as smart phones.

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 a better curvature radius characteristic, 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 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 nine lenses are exemplified in the embodiment, the imaging system is not limited to include nine lenses. The imaging system may also include other numbers of lenses, as desired.

Examples of specific surface types, parameters applicable to the 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 imaging system of example one of the present application is described. Fig. 1 shows a schematic configuration diagram of an imaging system of example one.

As shown in fig. 1, the imaging system, in order from an object side to an image side, comprises: the stop STO, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, the filter E10, and the image plane S21.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has positive power, and its surface S5 facing the light-in side is convex, and its surface S6 facing the light-out side is concave. The fourth lens E4 has positive power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is convex. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is concave, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The seventh lens E7 has negative power, and the surface S13 of the seventh lens facing the light-in side is concave, and the surface S14 of the seventh lens facing the light-out side is convex. The eighth lens E8 has positive refractive power, and a surface S15 of the eighth lens facing the light entrance side is convex, and a surface S16 of the eighth lens facing the light exit side is concave. The ninth lens E9 has negative power, and its surface S17 facing the light entrance side is concave, and its surface S18 facing the light exit side is convex. The filter E10 has a surface S19 facing the light entrance side of the filter and a surface S20 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S20 in order and is finally imaged on the imaging surface S21.

In this example, the image height ImgH of the imaging system is 8.43 mm. The total length TTL of the imaging system is 10.2 mm.

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

TABLE 1

In the first example, a surface facing the light incident side and a surface facing the light exiting side of any one of the first lens E1 to the ninth lens E9 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 that can be used for each of the aspherical mirrors S1-S18 in example one.

TABLE 2

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

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

Example two

As shown in fig. 6 to 10, an imaging system of example two of the present application is described. Fig. 6 shows a schematic configuration diagram of an imaging system of example two.

As shown in fig. 6, the imaging system, in order from an object side to an image side, comprises: the stop STO, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, the filter E10, and the image plane S21.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has positive power, and its surface S5 facing the light entrance side is convex, and its surface S6 facing the light exit side is concave. The fourth lens E4 has positive power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is convex. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is concave, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The seventh lens E7 has negative power, and the surface S13 of the seventh lens facing the light-in side is concave, and the surface S14 of the seventh lens facing the light-out side is convex. The eighth lens E8 has positive refractive power, and a surface S15 of the eighth lens facing the light entrance side is convex, and a surface S16 of the eighth lens facing the light exit side is concave. The ninth lens E9 has negative power, and its surface S17 facing the light entrance side is concave, and its surface S18 facing the light exit side is convex. The filter E10 has a surface S19 facing the light entrance side of the filter and a surface S20 facing the light exit side of the filter. Light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In this example, the image height ImgH of the imaging system is 8.43 mm. The total length TTL of the imaging system is 9.79 mm.

Table 3 shows a basic structural parameter table of the imaging system of example two, in which the units of the radius of curvature, thickness/distance, and focal length are all 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

-2.8166E-02

-1.2262E-02

-4.0747E-03

-1.1358E-03

-2.9825E-04

-7.2939E-05

-2.2034E-05

S2

-7.1249E-02

-1.3471E-03

-2.9439E-03

-1.3572E-04

-1.6714E-04

-1.1467E-05

-2.7833E-06

S3

-5.8517E-02

1.6729E-02

-4.6694E-04

1.7043E-04

-1.4112E-04

-3.8351E-05

-8.1357E-06

S4

-1.3331E-02

1.2486E-02

9.9086E-04

3.6782E-04

-4.7814E-05

-5.9758E-05

-4.0490E-05

S5

-1.5257E-02

1.2752E-02

4.3693E-03

1.1631E-03

1.9254E-04

1.4774E-05

-1.9115E-05

S6

-5.4204E-02

6.4299E-03

3.4553E-03

9.0765E-04

1.8751E-04

5.6498E-05

2.1880E-05

S7

-2.8502E-01

-4.2665E-02

-5.3467E-03

-1.5686E-03

-8.2244E-04

-4.8325E-04

-4.8837E-05

S8

-3.6460E-01

-7.6101E-02

-1.0995E-02

-8.4901E-03

-1.8405E-03

-1.7733E-03

-1.8107E-05

S9

-3.3858E-01

-9.0619E-02

-9.4318E-03

-1.1761E-02

-9.0413E-04

-1.8502E-03

1.3787E-04

S10

-3.9811E-01

-7.0209E-02

1.7696E-02

6.5095E-05

5.3279E-03

1.1316E-03

2.1500E-03

S11

-7.7070E-01

3.4774E-02

-4.9428E-03

-1.3080E-02

-4.4000E-04

-1.1535E-03

2.6129E-03

S12

-1.0647E+00

1.1259E-01

-2.4210E-03

-8.1482E-03

5.1252E-03

-8.1145E-04

1.5516E-03

S13

-5.9133E-01

-1.5549E-01

8.2670E-02

1.0381E-02

7.7286E-03

-1.0684E-03

2.4347E-03

S14

-1.3366E+00

3.0545E-01

-1.7378E-02

1.8447E-03

-2.2530E-02

1.0163E-02

5.1374E-03

S15

-8.6152E+00

2.0976E+00

-3.1109E-01

-3.6869E-02

-1.0212E-03

2.6439E-02

-2.1308E-02

S16

-6.7297E+00

6.0442E-01

1.1127E-01

-1.0923E-01

2.0129E-02

-3.7908E-02

-4.4663E-03

S17

4.1499E+00

-7.7598E-03

-1.0738E-01

1.3394E-02

1.2101E-02

-1.9437E-02

7.3917E-03

S18

-2.9580E+00

5.1134E-01

9.5475E-02

1.6713E-02

-1.0386E-02

-2.4796E-02

-4.4248E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-6.1207E-06

-1.4370E-06

-5.4811E-07

-1.3964E-07

6.7214E-07

8.2503E-07

6.8168E-08

S2

4.6581E-06

6.1883E-06

6.0413E-06

4.0826E-06

1.8397E-06

7.2136E-08

-3.1299E-07

S3

2.3609E-06

4.8717E-06

3.9154E-06

2.3855E-06

8.9998E-07

-3.2224E-07

-8.1690E-07

S4

-1.3835E-05

-6.9631E-06

6.5264E-07

-1.1524E-06

-4.6759E-07

-7.0365E-07

1.8216E-06

S5

-1.0976E-05

-5.5502E-06

4.3020E-07

-1.7813E-07

4.6226E-07

-1.1622E-06

0.0000E+00

S6

5.8416E-06

4.3677E-06

9.6050E-07

-2.8897E-07

-1.6436E-06

-7.0880E-07

0.0000E+00

S7

-7.9096E-05

3.4499E-05

0.0000E+00

S8

-1.7244E-04

-3.7482E-05

-4.2010E-05

2.9830E-05

0.0000E+00

S9

-1.2797E-04

2.3014E-05

-8.6626E-06

4.8336E-05

7.0814E-07

7.6532E-08

0.0000E+00

S10

3.9741E-04

4.7563E-04

7.1659E-05

7.4380E-05

-2.6203E-05

0.0000E+00

S11

-6.3239E-04

4.5533E-04

-1.0298E-04

1.0483E-04

-5.4327E-05

1.8653E-05

3.9668E-06

S12

-2.2054E-03

5.9002E-04

-3.1178E-04

1.9296E-04

-6.1416E-05

8.1319E-05

-1.8383E-05

S13

-1.7589E-03

-3.7392E-04

-2.5672E-04

1.5277E-04

-2.2305E-05

1.8760E-05

1.8510E-05

S14

-1.5529E-03

-7.8849E-04

2.8065E-04

4.3938E-04

-1.0931E-04

-4.5016E-05

5.8523E-06

S15

9.0367E-03

-5.3698E-04

-1.9030E-03

7.9051E-04

3.2247E-04

-2.2667E-04

1.9017E-05

S16

-2.4883E-03

1.1580E-02

-2.8501E-03

-5.0248E-04

-1.4025E-03

9.5108E-04

-8.1250E-05

S17

1.6521E-04

-1.5327E-03

-1.1394E-03

1.0697E-03

-1.5804E-04

-4.0812E-04

1.8038E-04

S18

1.1121E-02

4.8375E-05

-2.6292E-03

1.0584E-04

9.3870E-04

-4.9820E-04

-7.3670E-05

TABLE 4

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

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

Example III

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

As shown in fig. 11, the imaging system, in order from an object side to an image side, comprises: the stop STO, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, the filter E10, and the image plane S21.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has positive power, and its surface S5 facing the light-in side is convex, and its surface S6 facing the light-out side is concave. The fourth lens E4 has positive power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is convex. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is concave, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light entrance side is convex, and its surface S12 facing the light exit side is concave. The seventh lens E7 has negative power, and the surface S13 of the seventh lens facing the light-in side is concave, and the surface S14 of the seventh lens facing the light-out side is convex. The eighth lens E8 has positive refractive power, and a surface S15 of the eighth lens facing the light entrance side is convex, and a surface S16 of the eighth lens facing the light exit side is concave. The ninth lens E9 has negative power, and its surface S17 facing the light entrance side is concave, and its surface S18 facing the light exit side is convex. The filter E10 has a surface S19 facing the light entrance side of the filter and a surface S20 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S20 in order and is finally imaged on the imaging surface S21.

Table 5 shows a basic structural parameter table of the imaging system of example three, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.

TABLE 6

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

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

Example four

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

As shown in fig. 16, the imaging system, in order from an object side to an image side, comprises: the stop STO, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, the filter E10, and the image plane S21.

The first lens E1 has positive power, the surface S1 of the first lens facing the light entrance side is convex, and the surface S2 of the first lens facing the light exit side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has positive power, and its surface S5 facing the light-in side is convex, and its surface S6 facing the light-out side is concave. The fourth lens E4 has positive power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is convex. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is concave, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The seventh lens E7 has negative power, and the surface S13 of the seventh lens facing the light-in side is concave, and the surface S14 of the seventh lens facing the light-out side is convex. The eighth lens E8 has positive refractive power, and a surface S15 of the eighth lens facing the light entrance side is convex, and a surface S16 of the eighth lens facing the light exit side is concave. The ninth lens E9 has negative power, and its surface S17 facing the light entrance side is concave, and its surface S18 facing the light exit side is convex. The filter E10 has a surface S19 facing the light entrance side of the filter and a surface S20 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S20 in order and is finally imaged on the imaging surface S21.

In this example, the image height ImgH of the imaging system is 8.43 mm. The total length TTL of the imaging system is 9.90 mm.

Table 7 shows a basic structural parameter table of the imaging system of example four, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.

TABLE 8

Fig. 17 shows on-axis chromatic aberration curves for the imaging system of example four, which represent the deviation of the convergent focus for light rays of different wavelengths after passing through the imaging system. Fig. 18 shows astigmatism curves of the imaging system of example four, which represent meridional field curvature and sagittal field curvature. Fig. 19 shows distortion curves of the 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 imaging system of example four, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

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

Example five

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

As shown in fig. 21, the imaging system, in order from an object side to an image side, comprises: the stop STO, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, the filter E10, and the image plane S21.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has positive power, and its surface S5 facing the light-in side is convex, and its surface S6 facing the light-out side is concave. The fourth lens E4 has positive power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is convex. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is concave, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The seventh lens E7 has negative power, and the surface S13 of the seventh lens facing the light-in side is concave, and the surface S14 of the seventh lens facing the light-out side is convex. The eighth lens E8 has positive refractive power, and a surface S15 of the eighth lens facing the light entrance side is convex, and a surface S16 of the eighth lens facing the light exit side is concave. The ninth lens E9 has negative power, and its surface S17 facing the light entrance side is concave, and its surface S18 facing the light exit side is convex. The filter E10 has a surface S19 facing the light entrance side of the filter and a surface S20 facing the light exit side of the filter. Light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In this example, the image height ImgH of the imaging system is 8.43 mm. The total length TTL of the imaging system is 9.88 mm.

Table 9 shows a basic structural parameter table of the imaging system of example five, in which the units of the radius of curvature, thickness/distance, and focal length are all 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

-2.3337E-02

-9.7833E-03

-3.1138E-03

-8.2242E-04

-2.0411E-04

-4.4929E-05

-1.2990E-05

S2

-5.6059E-02

6.0031E-04

-1.7868E-03

3.4613E-05

-7.6263E-05

-7.8271E-07

-2.0071E-06

S3

-5.7929E-02

1.5995E-02

-4.3970E-04

1.8548E-04

-1.2117E-04

-3.4471E-05

-9.6652E-06

S4

-1.3265E-02

1.2559E-02

9.9989E-04

3.6774E-04

-5.0786E-05

-6.1886E-05

-4.1562E-05

S5

-1.1573E-02

1.6938E-02

5.9360E-03

1.5455E-03

2.0852E-04

-3.1627E-05

-5.6341E-05

S6

-5.6283E-02

9.4324E-03

4.8822E-03

1.3653E-03

3.2717E-04

1.0355E-04

3.2586E-05

S7

-3.0627E-01

-4.7631E-02

-6.7180E-03

-2.2447E-03

-1.1765E-03

-6.1549E-04

-7.8007E-05

S8

-3.9027E-01

-8.4602E-02

-1.4499E-02

-1.0414E-02

-2.6935E-03

-2.1373E-03

-1.1176E-04

S9

-3.5136E-01

-9.5172E-02

-1.1197E-02

-1.2685E-02

-1.2030E-03

-1.9701E-03

1.4076E-04

S10

-4.1106E-01

-7.0158E-02

2.0036E-02

1.6776E-03

6.6350E-03

1.9532E-03

2.6493E-03

S11

-7.9892E-01

3.4323E-02

-7.4636E-03

-1.4040E-02

-1.8270E-05

-5.0398E-04

2.9996E-03

S12

-1.1128E+00

1.2146E-01

-3.8988E-03

-8.0633E-03

5.5331E-03

-1.2033E-03

9.9801E-04

S13

-6.3659E-01

-1.4556E-01

9.9483E-02

1.4565E-02

8.5429E-03

-1.5991E-03

1.5678E-03

S14

-1.3559E+00

3.1710E-01

-1.9384E-02

6.5910E-04

-2.1665E-02

1.2145E-02

5.3086E-03

S15

-8.8401E+00

2.2027E+00

-3.5198E-01

-3.7930E-02

3.3860E-03

2.5772E-02

-2.2345E-02

S16

-7.0717E+00

6.3344E-01

8.7777E-02

-1.2568E-01

1.0306E-02

-4.0034E-02

-3.6442E-03

S17

4.2781E+00

-1.9845E-02

-1.1308E-01

1.3870E-02

1.0074E-02

-2.0435E-02

7.7237E-03

S18

-2.9433E+00

5.0089E-01

9.4144E-02

1.7917E-02

-8.7876E-03

-2.4261E-02

-5.0014E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.4696E-06

-7.4396E-07

-5.6813E-07

-7.2277E-07

-1.0350E-07

4.4871E-07

3.9134E-08

S2

-6.7883E-07

-1.0200E-06

-6.5740E-07

-2.5229E-07

2.8468E-07

2.2005E-07

-6.1432E-08

S3

-5.1433E-07

2.4516E-06

2.5054E-06

1.9117E-06

1.0597E-06

4.2232E-08

-6.4300E-07

S4

-1.4237E-05

-7.0659E-06

6.4858E-07

-1.1455E-06

-4.2692E-07

-6.3435E-07

1.8650E-06

S5

-2.9876E-05

-1.3630E-05

-3.6438E-06

-3.3412E-06

-1.8668E-06

-2.2207E-06

0.0000E+00

S6

2.5361E-06

-3.4417E-06

-7.6152E-06

-6.6917E-06

-4.8097E-06

-1.3852E-06

0.0000E+00

S7

-7.8328E-05

4.4116E-05

0.0000E+00

S8

-2.2644E-04

-4.8310E-05

-3.5118E-05

3.7883E-05

0.0000E+00

S9

-1.2448E-04

3.6245E-05

3.0037E-06

5.4708E-05

8.2979E-07

8.8004E-08

0.0000E+00

S10

6.1612E-04

5.7876E-04

9.7561E-05

7.6898E-05

-3.0972E-05

0.0000E+00

S11

-5.6047E-04

5.4452E-04

-8.6763E-05

1.1703E-04

-5.3800E-05

2.7201E-05

5.2726E-06

S12

-2.4675E-03

7.7505E-04

-2.2586E-04

2.9371E-04

-2.5128E-05

9.8825E-05

-2.8652E-05

S13

-2.6184E-03

-4.8597E-04

-1.4384E-04

2.7377E-04

2.6590E-05

5.5932E-05

2.9710E-05

S14

-1.8187E-03

-6.9866E-04

4.3871E-04

4.5600E-04

-1.5266E-04

-5.2543E-05

7.3654E-06

S15

1.0473E-02

-1.2594E-03

-1.8357E-03

1.1296E-03

2.5034E-04

-3.0711E-04

2.8310E-05

S16

-1.9472E-03

1.1653E-02

-3.4929E-03

-6.7233E-04

-1.2649E-03

1.1313E-03

-1.5735E-04

S17

-5.4141E-04

-1.9731E-03

-1.0917E-03

1.1077E-03

-2.9589E-04

-4.0473E-04

2.3035E-04

S18

1.0814E-02

2.6136E-04

-2.5421E-03

5.1430E-05

9.5107E-04

-4.5468E-04

-6.8359E-05

Watch 10

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

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

Example six

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

As shown in fig. 26, the imaging system, in order from an object side to an image side, comprises: the stop STO, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, the filter E10, and the image plane S21.

The first lens E1 has positive power, the surface S1 of the first lens facing the light entrance side is convex, and the surface S2 of the first lens facing the light exit side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has positive power, and its surface S5 facing the light-in side is convex, and its surface S6 facing the light-out side is concave. The fourth lens E4 has positive power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is convex. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is concave, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The seventh lens E7 has negative power, and its surface S13 facing the light entrance side is concave, and its surface S14 facing the light exit side is convex. The eighth lens E8 has positive refractive power, and a surface S15 of the eighth lens facing the light entrance side is convex, and a surface S16 of the eighth lens facing the light exit side is concave. The ninth lens E9 has negative power, and its surface S17 facing the light entrance side is concave, and its surface S18 facing the light exit side is convex. The filter E10 has a surface S19 facing the light entrance side of the filter and a surface S20 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S20 in order and is finally imaged on the imaging surface S21.

In this example, the image height ImgH of the imaging system is 8.16 mm. The total length TTL of the imaging system is 9.90 mm.

Table 11 shows a basic structural parameter table of the imaging system of example six, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.

TABLE 12

Fig. 27 shows an on-axis chromatic aberration curve of the imaging system of example six, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging system. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging system of example six. Fig. 29 shows distortion curves of the 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 imaging system of example six, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 27 to 30, the imaging system given in 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
							TTL/ImgH	1.21	1.16	1.16	1.17	1.17	1.21
f/EPD	1.80	1.80	1.75	1.70	1.70	1.70
							TTL/f	1.18	1.21	1.22	1.23	1.23	1.20
FOV	87.2	89.6	89.7	89.7	89.9	86.6
							f	8.68	8.07	8.05	8.04	8.02	8.24
(R2+R1)/(R2-R1)	1.66	1.75	1.76	1.72	1.73	1.68
							f2/(R3+R4)	-3.48	-4.00	-3.83	-3.46	-3.59	-3.36
f3/R5	5.77	3.91	3.67	4.04	3.92	3.92
							f7/f8	-7.89	-7.63	-7.75	-10.80	-10.45	-9.47
f6/f9	4.95	4.61	4.58	5.24	5.04	5.49
							R5/R4	4.83	4.32	3.85	3.51	3.56	4.20
R8/R9	2.11	1.66	1.69	1.82	1.78	1.59
							R11/R10	-2.32	-2.28	-2.68	-1.93	-2.16	-1.35
R13/R12	-1.16	-1.36	-1.32	-1.26	-1.25	-1.41
							R14/R15	-9.07	-11.75	-11.69	-8.70	-8.89	-9.90
R11/R12	2.64	3.07	3.41	2.67	2.91	2.27
							T89/T78	7.12	8.32	7.96	8.17	8.32	8.08
ET9/CT9	0.73	1.33	1.41	1.48	1.47	1.72

Table 13 table 14 shows effective focal lengths f1 to f9 of respective lenses of the imaging systems of example one to example six.

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 apparatus is equipped with the 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 accompanying drawings 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 imaging system from an entrance side of the imaging system to an exit side of the imaging system, comprising:

a first lens with optical power, wherein the material of the first lens is a glass material;

a second lens having an optical power;

a third lens having positive optical power;

a fourth lens having an optical power;

the surface of the fifth lens facing the light inlet side is a concave surface, and the surface of the fifth lens facing the light outlet side is a convex surface;

a sixth lens having a negative refractive power;

the surface of the seventh lens facing the light inlet side is a concave surface, and the surface of the seventh lens facing the light outlet side is a convex surface;

an eighth lens having optical power;

a ninth lens having a focal power, a surface of the ninth lens facing the light exit side being convex;

the imaging system comprises a first lens, a second lens, a third lens and a fourth lens, wherein the length of the diagonal ImgH of an effective pixel area on an imaging surface of the imaging system is half of the length of the diagonal ImgH of the effective pixel area, and the on-axis distance TTL from the surface of the first lens facing the light incidence side to the imaging surface satisfy the following conditions: TTL/ImgH is less than 1.3.

2. The imaging system of claim 1, wherein an effective focal length f of the imaging system and an entrance pupil diameter EPD of the imaging system satisfy: f/EPD is less than or equal to 1.8.

3. The imaging system of claim 1, wherein an on-axis distance TTL from a surface of the first lens facing the light entrance side to the imaging plane and an effective focal length f of the imaging system satisfy: TTL/f is less than 1.3.

4. The imaging system of claim 1, wherein a maximum field angle FOV of the imaging system satisfies:

FOV＞80°。

5. the imaging system of claim 1, wherein the effective focal length f of the imaging system satisfies: f is more than 8.0 mm.

6. The imaging system of claim 1, wherein a radius of curvature R1 of the surface of the first lens facing the light-in side and a radius of curvature R2 of the surface of the first lens facing the light-out side satisfy: 1.5 < (R2+ R1)/(R2-R1) < 2.0.

7. The imaging system of claim 1, wherein an effective focal length f2 of the second lens, a radius of curvature R3 of a surface of the second lens facing the light-entry side, and a radius of curvature R4 of a surface of the second lens facing the light-exit side satisfy: f2/(R3+ R4) < -2.5 is more than or equal to-4.0.

8. The imaging system of claim 1, wherein an effective focal length f3 of the third lens and a radius of curvature R5 of a light-entry-side-facing surface of the third lens satisfy: f3/R5 is more than 3.5 and less than 6.0.

9. The imaging system of claim 1, wherein an effective focal length f7 of the seventh lens and an effective focal length f8 of the eighth lens satisfy: 11.0 < f7/f8 < -7.0.

10. An imaging system from an entrance side of the imaging system to an exit side of the imaging system, comprising:

a second lens having an optical power;

a third lens having a positive optical power;

a fourth lens having a focal power;

a sixth lens having a negative optical power;

an eighth lens having optical power;

the axial distance TTL from the surface of the first lens facing the light incidence side to the imaging surface of the imaging system and the effective focal length f of the imaging system satisfy the following conditions: TTL/f is less than 1.3.