CN217543512U

CN217543512U - Optical imaging system

Info

Publication number: CN217543512U
Application number: CN202221299796.1U
Authority: CN
Inventors: 肖海东; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-10-04
Anticipated expiration: 2032-05-27

Abstract

The utility model provides an optical imaging system, include: a diaphragm, the diaphragm being movable; a first lens having a positive refractive power; the surface of the second lens facing the object side is in a convex shape, and the surface of the second lens facing the image side is in a concave shape; a third lens with positive refractive power, wherein the surface of the third lens facing the object side is in a concave shape, and the surface of the third lens facing the image side is in a convex shape; the surface of the fourth lens, which faces the object side, is in a convex shape, and the surface of the fourth lens, which faces the image side, is in a concave shape; a fifth lens having negative refractive power; a sixth lens with positive refractive power, wherein the surface of the sixth lens facing the object side is in a convex shape; a seventh optic having refractive power; wherein, the entrance pupil diameter EPDA of the optical imaging system in the A state and the entrance pupil diameter EPDB of the optical imaging system in the B state satisfy: 2.8mm < (EPDA-EPDB) <3.8mm.

Description

Optical imaging system

Technical Field

The utility model relates to an optical imaging equipment technical field particularly, relates to an optical imaging system.

Background

With the development of mobile phone shooting technology, a mobile phone lens with high imaging quality is more and more favored. The mobile phone in the market develops towards the direction of lightness and thinness, the size of the mobile phone lens is required to be smaller, but due to the limitation of narrow space of the mobile phone, the difficulty of obtaining high-quality images by the mobile phone lens in a complex light environment is increased.

That is to say, the optical imaging system in the prior art has the problem of poor imaging quality in a complex light environment.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an optical imaging system to solve the problem of poor imaging quality in the prior art in the presence of complex light environment in the optical imaging system.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging system including: a diaphragm, the diaphragm being movable; a first lens having a positive refractive power; the surface of the second lens facing to the object side is in a convex shape, and the surface of the second lens facing to the image side is in a concave shape; a third lens with positive refractive power, wherein the surface of the third lens facing the object side is in a concave shape, and the surface of the third lens facing the image side is in a convex shape; the surface of the fourth lens, which faces the object side, is in a convex shape, and the surface of the fourth lens, which faces the image side, is in a concave shape; a fifth lens having negative refractive power; a sixth lens with positive refractive power, wherein the surface of the sixth lens facing the object side is in a convex shape; a seventh optic having refractive power; wherein, the entrance pupil diameter EPDA of the optical imaging system in the A state and the entrance pupil diameter EPDB of the optical imaging system in the B state satisfy: 2.8mm < (EPDA-EPDB) <3.8mm.

Furthermore, the curvature radius R1 of the surface of the first lens facing the object side, the curvature radius R2 of the surface of the first lens facing the image side and the effective focal length f1 of the first lens satisfy the following conditions: 2.0< (R2-R1)/f 1<4.5.

Further, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the following condition: 2.0< (f 3-f 2)/(f 3+ f 2) <6.4.

Furthermore, the curvature radius R3 of the surface of the second lens facing the object side, the curvature radius R4 of the surface of the second lens facing the image side, the curvature radius R5 of the surface of the third lens facing the object side and the curvature radius R6 of the surface of the third lens facing the image side satisfy: 0.6< (R6-R5)/(R3 + R4) <1.6.

Further, the effective focal length f5 of the fifth lens and the curvature radius R9 of the surface of the fifth lens facing the object side satisfy: 1.5 were woven so as to have f5/R9<3.3.

Further, an effective focal length f6 of the sixth lens and a curvature radius R11 of a surface of the sixth lens facing the object side satisfy: 1.3 were woven so as to have f6/R11<3.0.

Further, the composite focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens on the optical axis of the optical imaging system, the central thickness CT2 of the second lens on the optical axis of the optical imaging system, and the air interval T23 of the second lens and the third lens on the optical axis of the optical imaging system satisfy: 5.5 were woven so as to be f12/(CT 1+ CT2+ T23) <6.7.

Further, the combined focal length f34 of the third lens and the fourth lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy the following condition: 0.5 and once f34/f56<2.9.

Further, the combined focal length f123456 of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, the air interval T67 of the sixth lens and the seventh lens on the optical axis of the optical imaging system, and the central thickness CT7 of the seventh lens on the optical axis of the optical imaging system satisfy: 2.2 were woven fabric f123456/(T67 + CT 7) <3.6.

Further, an on-axis distance SAG61 from an intersection point of a surface of the sixth lens facing the object side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the sixth lens facing the object side, an on-axis distance SAG62 from an intersection point of the surface of the sixth lens facing the image side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the sixth lens facing the image side, an on-axis distance SAG51 from an intersection point of a surface of the fifth lens facing the object side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the fifth lens facing the object side, and an on-axis distance SAG52 from an intersection point of the surface of the fifth lens facing the image side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the fifth lens facing the image side satisfy: 0.3< (SAG 61+ SAG 62)/(SAG 51+ SAG 52) <1.7.

Further, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens and the edge thickness ET7 of the seventh lens satisfy: 0.8< (ET 2+ ET3+ ET 4)/ET 7<3.1.

According to another aspect of the present invention, there is provided an optical imaging system, comprising: the diaphragm is movable; a first lens having a positive refractive power; the surface of the second lens facing to the object side is in a convex shape, and the surface of the second lens facing to the image side is in a concave shape; a third lens with positive refractive power, wherein the surface of the third lens facing the object side is in a concave shape, and the surface of the third lens facing the image side is in a convex shape; the surface of the fourth lens, which faces to the object side, is convex, and the surface of the fourth lens, which faces to the image side, is concave; a fifth lens having negative refractive power; a sixth lens with positive refractive power, wherein the surface of the sixth lens facing the object side is in a convex shape; a seventh optic having refractive power; the synthetic focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens on the optical axis of the optical imaging system, the central thickness CT2 of the second lens on the optical axis of the optical imaging system, and the air interval T23 of the second lens and the third lens on the optical axis of the optical imaging system satisfy the following conditions: 5.5 were woven so as to be f12/(CT 1+ CT2+ T23) <6.7.

Further, the curvature radius R1 of the surface of the first lens facing the object side, the curvature radius R2 of the surface of the first lens facing the image side and the effective focal length f1 of the first lens satisfy: 2.0< (R2-R1)/f 1<4.5.

Further, an effective focal length f6 of the sixth lens and a curvature radius R11 of a surface of the sixth lens facing the object side satisfy: 1.3 were < -f6/R11 <3.0.

Further, the combined focal length f34 of the third lens and the fourth lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy the following condition: 0.5 were woven so as to have f34/f56<2.9.

Further, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens and the edge thickness ET7 of the seventh lens satisfy the following conditions: 0.8< (ET 2+ ET3+ ET 4)/ET 7<3.1.

Use the technical scheme of the utility model, optical imaging system includes diaphragm, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens. The diaphragm is movable; the first lens has positive refractive power; the second lens has negative refractive power, the surface of the second lens facing the object side is in a convex shape, and the surface of the second lens facing the image side is in a concave shape; the third lens has positive refractive power, the surface of the third lens facing the object side is in a concave shape, and the surface of the third lens facing the image side is in a convex shape; the fourth lens has refractive power, the surface of the fourth lens facing the object side is in a convex shape, and the surface of the fourth lens facing the image side is in a concave shape; the fifth lens has negative refractive power; the sixth lens has positive refractive power, and the surface of the sixth lens facing the object side is in a convex shape; the seventh lens has refractive power; wherein, the entrance pupil diameter EPDA of the optical imaging system in the A state and the entrance pupil diameter EPDB of the optical imaging system in the B state satisfy: 2.8mm < (EPDA-EPDB) <3.8mm.

Through the refracting power of each lens of rational distribution, be favorable to balancing the aberration that optical imaging system produced, can avoid the great deflection to appear in the light path simultaneously, greatly increased optical imaging system's formation of image quality. The first lens, the third lens and the sixth lens have positive refractive power, light can be effectively converged, the second lens and the fifth lens have negative refractive power, the positive refractive power and the negative refractive power are distributed in a staggered mode, the phenomenon that the local lenses are strange in shape and difficult to process due to too concentrated refractive power is avoided. By limiting (EPDA-EPDB) in a reasonable range and reasonably controlling the size of the diameter of an entrance pupil, the range of the state of the iris diaphragm is widely covered, the maximum diaphragm can reach F #1.6, the minimum diaphragm can reach F #4.0 and above, the seamless connection from an extremely dark environment to an extremely bright environment is realized, the optical imaging system has enough luminous flux and radiation illumination, the requirement that the optical imaging system meets clear imaging under different light environments is ensured, and the effect that the optical imaging system can clearly image under the complex light environment is effectively realized.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, 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 diagram of an example of the present invention, an optical imaging system in the A state;

FIG. 2 is a schematic diagram of an optical imaging system in the B state according to an example of the present invention;

3-5 illustrate on-axis aberration, astigmatism, and distortion curves for the optical imaging system of FIG. 1;

FIGS. 6-8 illustrate on-axis aberration, astigmatism, and distortion curves for the optical imaging system of FIG. 2;

fig. 9 is a schematic structural diagram of an optical imaging system in an a state according to an example of the present invention;

fig. 10 is a schematic structural diagram of an optical imaging system in a B state according to an example of the present invention;

fig. 11 to 13 show on-axis aberration curves, astigmatism curves, and distortion curves of the optical imaging system in fig. 9;

fig. 14 to 16 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging system in fig. 10;

fig. 17 is a schematic structural diagram of an optical imaging system in a state a according to a third example of the present invention;

fig. 18 is a schematic structural diagram of an optical imaging system in a B state according to an example of the present invention;

fig. 19 to 21 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging system in fig. 17;

fig. 22 to 24 show on-axis aberration curves, astigmatism curves, and distortion curves of the optical imaging system in fig. 18;

fig. 25 is a schematic structural diagram of an optical imaging system in the a state according to an example of the present invention;

fig. 26 is a schematic structural diagram of an optical imaging system in a B state according to an example of the present invention;

fig. 27 to 29 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging system in fig. 25;

fig. 30 to 32 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging system in fig. 26;

fig. 33 is a schematic structural view of an optical imaging system in an a state according to an example of the present invention;

fig. 34 is a schematic structural view of an optical imaging system in a B state according to example five of the present invention;

fig. 35 to 37 show on-axis aberration curves, astigmatism curves, and distortion curves of the optical imaging system in fig. 33;

fig. 38 to 40 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging system in fig. 34.

Wherein the figures include the following reference numerals:

STO, stop; e1, a first lens; s1, a surface of the first lens facing the object side; s2, a surface of the first lens facing the image side; e2, a second lens; s3, the surface of the second lens facing the object side; s4, the surface of the second lens facing the image side; e3, a third lens; s5, the surface of the third lens facing the object side; s6, the surface of the third lens facing the image side; e4, a fourth lens; s7, the surface of the fourth lens facing the object side; s8, the surface of the fourth lens facing the image side; e5, a fifth lens; s9, the surface of the fifth lens facing the object side; s10, a surface of the fifth lens facing the image side; e6, a sixth lens; s11, the surface of the sixth lens facing the object side; s12, the surface of the sixth lens facing the image side; e7, a seventh lens; s13, the surface of the seventh lens facing the object side; s14, a surface of the seventh lens facing the image side; e8, a filter plate; s15, the surface of the filter facing the object side; s16, the surface of the filter plate facing the image side; 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 accompanying drawings in conjunction with embodiments.

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 application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; 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 only used to distinguish one feature from another, and do not represent any limitation on the features. Thus, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for the 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, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concave shape is not defined, it is indicative that the lens surface is concave at least in the paraxial region. The surface of each lens close to the object side is the surface of the lens facing to the object side, and the surface of each lens close to the image side is called the surface of the lens facing to the image side. The determination of the surface shape in the paraxial region can be made by determining whether or not the surface shape is concave or convex using an R value (R denotes a radius of curvature of the paraxial region, and usually denotes an R value in a lens database (lens data) in optical software) according to a determination method by a person ordinarily skilled in the art. When the value of R is positive, the surface facing the object side is determined to be convex, and when the value of R is negative, the surface is determined to be concave; on the surface facing the image side, the shape is determined to be concave when the R value is positive, and convex when the R value is negative.

Herein, the a state refers to a state when the optical imaging system entrance pupil diameter is maximum, and the B state refers to a state when the optical imaging system entrance pupil diameter is minimum. That is, EPDA represents the maximum entrance pupil diameter that the optical imaging system can adjust, and EPDB represents the minimum entrance pupil diameter that the optical imaging system can adjust.

In order to solve the problem that the imaging quality is poor under the optical imaging system has complicated light environment among the prior art, the utility model mainly provides an optical imaging system.

Example one

As shown in fig. 1 to 40, the optical imaging system includes a diaphragm, a first mirror, a second mirror, a third mirror, a fourth mirror, a fifth mirror, a sixth mirror, and a seventh mirror. The diaphragm is movable; the first lens has positive refractive power; the second lens has negative refractive power, the surface of the second lens facing the object side is in a convex shape, and the surface of the second lens facing the image side is in a concave shape; the third lens has positive refractive power, the surface of the third lens facing the object side is in a concave shape, and the surface of the third lens facing the image side is in a convex shape; the fourth lens has refractive power, the surface of the fourth lens facing the object side is in a convex shape, and the surface of the fourth lens facing the image side is in a concave shape; the fifth lens has negative refractive power; the sixth lens has positive refractive power, and the surface of the sixth lens facing the object side is in a convex shape; the seventh lens has refractive power; the entrance pupil diameter EPDA of the optical imaging system in the A state and the entrance pupil diameter EPDB of the optical imaging system in the B state satisfy the following conditions: 2.8mm < (EPDA-EPDB) <3.8mm.

Through the refractive power of each lens of rational distribution, be favorable to balancing the aberration that optical imaging system produced, can avoid great deflection to appear in the light path simultaneously, greatly increased optical imaging system's formation of image quality. The first lens, the third lens and the sixth lens have positive refractive power, light can be effectively converged, the second lens and the fifth lens have negative refractive power, the positive refractive power and the negative refractive power are distributed in a staggered mode, and the phenomenon that the local lenses are strange in shape and difficult to process due to the fact that the refractive power is too concentrated is avoided. By limiting (EPDA-EPDB) in a reasonable range, the size of the diameter of an entrance pupil is reasonably controlled, the state range of the iris diaphragm is widely covered, the maximum diaphragm can reach F #1.6, the minimum diaphragm can reach F #4.0 and above, seamless connection from an extremely dark environment to an extremely bright environment is realized, the optical imaging system has enough luminous flux and radiation illumination, the requirement that the optical imaging system meets clear imaging under different light environments is met, and the effect that the optical imaging system can clearly image under a complex light environment is effectively realized.

Preferably, the entrance pupil diameter EPDA of the optical imaging system in the a state and the entrance pupil diameter EPDB of the optical imaging system in the B state satisfy: 3.1mm < (EPDA-EPDB) <3.4mm.

In this embodiment, the radius of curvature R1 of the surface of the first lens facing the object side, the radius of curvature R2 of the surface of the first lens facing the image side, and the effective focal length f1 of the first lens satisfy: 2.0< (R2-R1)/f 1<4.5. By limiting the (R2-R1)/f 1 within a reasonable range, the curvatures of the surface of the first lens facing the object side and the surface of the first lens facing the image side can be reasonably distributed, so that the appearance of the first lens is more favorable for injection molding and assembly, the surface sensitivity of the first lens is reduced, the matching of the surface of the first lens facing the object side and the surface of the first lens facing the image side is favorable for distributing the refractive power of the first lens and controlling the deflection trend of light, and the aberration of the first lens can be corrected. On the basis of the existing processing capability, the field curvature, astigmatism and distortion of the optical imaging system can be effectively balanced, and the imaging quality of the optical imaging system is ensured. Preferably, 2.3< (R2-R1)/f 1<4.4.

In the embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 2.0< (f 3-f 2)/(f 3+ f 2) <6.4. By limiting (f 3-f 2)/(f 3+ f 2) within a reasonable range, the sensitivity of the second lens and the third lens can be reduced, the aberration contribution of the second lens and the third lens can be optimized, the aberration of the optical imaging system can be reduced, and the imaging quality of the optical imaging system can be ensured. Preferably, 2.1< (f 3-f 2)/(f 3+ f 2) <5.0.

In this embodiment, the radius of curvature R3 of the surface of the second lens facing the object side, the radius of curvature R4 of the surface of the second lens facing the image side, the radius of curvature R5 of the surface of the third lens facing the object side, and the radius of curvature R6 of the surface of the third lens facing the image side satisfy: 0.6< (R6-R5)/(R3 + R4) <1.6. Through restricting (R6-R5)/(R3 + R4) in reasonable within range, can effectively adjust the refracting power of second lens and third lens, can avoid because the too big processing degree of difficulty that brings of field angle, avoided strict tolerance and technological level's restriction for optical imaging system's coma and field curvature etc. obtain effective buffering, balance optical imaging system's spherical aberration and field curvature effectively. Preferably, 0.8< (R6-R5)/(R3 + R4) <1.4.

In the present embodiment, the effective focal length f5 of the fifth lens and the radius of curvature R9 of the surface of the fifth lens facing the object side satisfy: 1.5 were woven so as to have f5/R9<3.3. By limiting the f5/R9 within a reasonable range, the curvature and the refractive power of the surface of the fifth lens facing the object side can be reasonably distributed, the deflection trend of light rays can be favorably controlled, and meanwhile, the aberration of the fifth lens can be effectively controlled. On the basis of the existing processing capability, the field curvature, astigmatism and distortion of the optical imaging system can be effectively balanced, and the imaging quality of the optical imaging system is ensured. Preferably, 1.7-woven fabric f5/R9<2.4.

In the present embodiment, the effective focal length f6 of the sixth lens and the radius of curvature R11 of the surface of the sixth lens facing the object side satisfy: 1.3 were woven so as to have f6/R11<3.0. By limiting the f6/R11 within a reasonable range, the curvature and the refractive power of the surface of the sixth lens facing the object side can be reasonably distributed, the deflection trend of light rays can be favorably controlled, and meanwhile, the aberration of the sixth lens can be effectively controlled. On the basis of the existing processing capability, the field curvature, astigmatism and distortion of the optical imaging system can be effectively balanced, and the imaging quality of the optical imaging system is ensured. Preferably, 1.5-woven fabric f6/R11<2.9.

In the present embodiment, the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens on the optical axis of the optical imaging system, the central thickness CT2 of the second lens on the optical axis of the optical imaging system, and the air interval T23 of the second lens and the third lens on the optical axis of the optical imaging system satisfy: 5.5 are sq f12/(CT 1+ CT2+ T23) <6.7. The thicknesses of the first lens and the second lens are reasonably distributed by limiting f 12/(CT 1+ CT2+ T23) within a reasonable range, the processing and the assembly of the lenses are facilitated, the ghost risk and the sensitivity of the lenses can be effectively reduced, the assembly process is met by balancing the air gap between the second lens and the third lens, the light deflection between the lenses can be weakened, the quantity distribution is improved, the thicknesses of the first lens and the second lens and the air gap between the second lens and the third lens are matched to greatly help to improve the field curvature, and the imaging quality of an optical imaging system is ensured. Preferably, 5.6 are woven fewer than 12/(CT 1+ CT2+ T23) <6.2.

In the embodiment, the combined focal length f34 of the third lens and the fourth lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy the following condition: 0.5 were woven so as to have f34/f56<2.9. By controlling f34/f56 within a reasonable range, the sensitivity of the third lens, the fourth lens, the fifth lens and the sixth lens is reduced, and the strict tolerance requirement is avoided. Meanwhile, the deflection angle of light rays is reduced, and the imaging quality of the optical imaging system is improved. Preferably, 0.6-woven fabric f34/f56<2.8.

In the present embodiment, the combined focal length f123456 of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, the air interval T67 of the sixth lens and the seventh lens on the optical axis of the optical imaging system, and the central thickness CT7 of the seventh lens on the optical axis of the optical imaging system satisfy: 2.2 were woven fabric f123456/(T67 + CT 7) <3.6. By limiting f 123456/(T67 + CT 7) within a reasonable range, the thickness of the seventh lens is reasonably distributed, the processing and assembly of the lenses are facilitated, the ghost risk and the sensitivity degree of the lenses can be effectively reduced, the field curvature balance of the optical imaging system can be effectively controlled, and the optical imaging system has reasonable field curvature. Preferably, 2.5-woven fabric f123456/(T67 + CT 7) <3.4.

In this embodiment, an on-axis distance SAG61 from an intersection point of a surface of the sixth lens facing the object side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the sixth lens facing the object side, an on-axis distance SAG62 from an intersection point of the surface of the sixth lens facing the image side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the sixth lens facing the image side, an on-axis distance SAG51 from an intersection point of a surface of the fifth lens facing the object side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the fifth lens facing the object side, and an on-axis distance SAG52 from an intersection point of the surface of the fifth lens facing the image side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the fifth lens facing the image side satisfy: 0.3< (SAG 61+ SAG 62)/(SAG 51+ SAG 52) <1.7. By controlling (SAG 61+ SAG 62)/(SAG 51+ SAG 52) in a reasonable range, the problem of overlarge curvature difference of the fifth lens and the sixth lens can be avoided, the uniformity and the continuity of the sizes of the fifth lens and the sixth lens are ensured, stray light can be effectively filtered by limiting the rise ratio, the imaging quality of an optical imaging system is improved, the structural sensitivity and the forming demoulding of the fifth lens and the sixth lens are reduced in engineering, and the practical processing assembly is facilitated. In addition, the total reflection of the lens is weakened, and the performance is improved. Preferably, 0.5< (SAG 61+ SAG 62)/(SAG 51+ SAG 52) <1.6.

In the present embodiment, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, and the edge thickness ET7 of the seventh lens satisfy: 0.8< (ET 2+ ET3+ ET 4)/ET 7<3.1. By controlling the (ET 2+ ET3+ ET 4)/ET 7 within a reasonable range, the uniformity and the continuity of the sizes of the second lens, the third lens, the fourth lens and the seventh lens can be effectively controlled, the structural sensitivity of each lens is reduced, the actual forming, demolding and processing assembly are facilitated, and the imaging quality of an optical imaging system is ensured. Preferably, 1.0< (ET 2+ ET3+ ET 4)/ET 7<3.0.

Example two

As shown in fig. 1 to 40, the optical imaging system includes a diaphragm, a first mirror, a second mirror, a third mirror, a fourth mirror, a fifth mirror, a sixth mirror, and a seventh mirror. The diaphragm is movable; the first lens has positive refractive power; the second lens has negative refractive power, the surface of the second lens facing the object side is in a convex shape, and the surface of the second lens facing the image side is in a concave shape; the third lens has positive refractive power, the surface of the third lens facing the object side is in a concave shape, and the surface of the third lens facing the image side is in a convex shape; the fourth lens has refractive power, the surface of the fourth lens facing the object side is in a convex shape, and the surface of the fourth lens facing the image side is in a concave shape; the fifth lens has negative refractive power; the sixth lens has positive refractive power, and the surface of the sixth lens facing the object side is in a convex shape; the seventh lens has refractive power; the composite focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens on the optical axis of the optical imaging system, the central thickness CT2 of the second lens on the optical axis of the optical imaging system, and the air interval T23 of the second lens and the third lens on the optical axis of the optical imaging system satisfy the following conditions: 5.5 were woven so as to be f12/(CT 1+ CT2+ T23) <6.7.

Through the refracting power of each lens of rational distribution, be favorable to balancing the aberration that optical imaging system produced, can avoid the great deflection to appear in the light path simultaneously, greatly increased optical imaging system's formation of image quality. The first lens, the third lens and the sixth lens have positive refractive power, light can be effectively converged, the second lens and the fifth lens have negative refractive power, the positive refractive power and the negative refractive power are distributed in a staggered mode, the phenomenon that the local lenses are strange in shape and difficult to process due to too concentrated refractive power is avoided. The thicknesses of the first lens and the second lens are reasonably distributed by limiting f 12/(CT 1+ CT2+ T23) within a reasonable range, so that the processing and the assembly of the lenses are facilitated, the ghost risk and the sensitivity of the lenses can be effectively reduced, the assembly process is met by balancing the air gap between the second lens and the third lens, the light deflection between the lenses can be weakened, the energy distribution is improved, the thicknesses of the first lens and the second lens and the air gap between the second lens and the third lens are matched to greatly help to improve the field curvature, and the imaging quality of an optical imaging system is ensured.

Preferably, the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens on the optical axis of the optical imaging system, the central thickness CT2 of the second lens on the optical axis of the optical imaging system, and the air interval T23 of the second lens and the third lens on the optical axis of the optical imaging system satisfy: 5.6 were woven so as to be f12/(CT 1+ CT2+ T23) <6.2.

In this embodiment, the radius of curvature R3 of the surface of the second lens facing the object side, the radius of curvature R4 of the surface of the second lens facing the image side, the radius of curvature R5 of the surface of the third lens facing the object side, and the radius of curvature R6 of the surface of the third lens facing the image side satisfy: 0.6< (R6-R5)/(R3 + R4) <1.6. Through restricting (R6-R5)/(R3 + R4) in reasonable within range, can effectively adjust the refracting power of second lens and third lens, can avoid because the processing degree of difficulty that the field angle was too big brought, avoided the restriction of strict tolerance and technology level for optical imaging system's coma and field curvature etc. obtain effective buffering, balance optical imaging system's spherical aberration and field curvature effectively. Preferably, 0.8< (R6-R5)/(R3 + R4) <1.4.

In the present embodiment, the effective focal length f6 of the sixth lens and the radius of curvature R11 of the surface of the sixth lens facing the object side satisfy: 1.3 were < -f6/R11 <3.0. By limiting the f6/R11 within a reasonable range, the curvature and the refractive power of the surface of the sixth lens facing the object side can be reasonably distributed, the deflection trend of light rays can be favorably controlled, and meanwhile, the aberration of the sixth lens can be effectively controlled. On the basis of the existing processing capability, the field curvature, astigmatism and distortion of the optical imaging system can be effectively balanced, and the imaging quality of the optical imaging system is ensured. Preferably, 1.5-woven fabric f6/R11<2.9.

In the present embodiment, the combined focal length f123456 of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, the air interval T67 of the sixth lens and the seventh lens on the optical axis of the optical imaging system, and the central thickness CT7 of the seventh lens on the optical axis of the optical imaging system satisfy: 2.2 were woven fabric f123456/(T67 + CT 7) <3.6. By limiting f 123456/(T67 + CT 7) within a reasonable range, the thickness of the seventh lens is reasonably distributed, the processing and the assembly of the lenses are facilitated, the ghost image risk and the sensitivity degree of the lenses can be effectively reduced, the field curvature balance of the optical imaging system can be effectively controlled, and the optical imaging system has reasonable field curvature. Preferably, 2.5-Ap f123456/(T67 + CT 7) <3.4.

In this embodiment, an on-axis distance SAG61 from an intersection point of a surface of the sixth lens facing the object side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the sixth lens facing the object side, an on-axis distance SAG62 from an intersection point of the surface of the sixth lens facing the image side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the sixth lens facing the image side, an on-axis distance SAG51 from an intersection point of a surface of the fifth lens facing the object side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the fifth lens facing the object side, and an on-axis distance SAG52 from an intersection point of the surface of the fifth lens facing the image side and the optical axis of the optical imaging system to an effective radius vertex of the surface of the fifth lens facing the image side satisfy: 0.3< (SAG 61+ SAG 62)/(SAG 51+ SAG 52) <1.7. By controlling (SAG 61+ SAG 62)/(SAG 51+ SAG 52) within a reasonable range, the problem of overlarge curvature difference of a fifth lens and a sixth lens can be avoided, the uniformity and the continuity of the sizes of the fifth lens and the sixth lens are ensured, stray light can be effectively filtered by limiting the rise ratio, the imaging quality of an optical imaging system is improved, the structural sensitivity and the forming and demolding of the fifth lens and the sixth lens are reduced in engineering, and the practical processing assembly is facilitated. In addition, the total reflection of the lens is weakened, and the performance is improved. Preferably, 0.5< (SAG 61+ SAG 62)/(SAG 51+ SAG 52) <1.6.

In the present embodiment, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, and the edge thickness ET7 of the seventh lens satisfy: 0.8< (ET 2+ ET3+ ET 4)/ET 7<3.1. By controlling (ET 2+ ET3+ ET 4)/ET 7 within a reasonable range, the size uniformity and continuity of the second lens, the third lens, the fourth lens and the seventh lens can be effectively controlled, the structural sensitivity of each lens is reduced, the actual forming, demolding and processing assembly are facilitated, and the imaging quality of an optical imaging system is ensured. Preferably, 1.0< (ET 2+ ET3+ ET 4)/ET 7<3.0.

Optionally, the optical 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 optical imaging system in the present application may employ a plurality of lenses, such as the seven lenses described above. By reasonably distributing the refractive power, the surface shape, the center thickness of each lens, the on-axis distance between each lens and the like, the aperture of the optical imaging system can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the optical imaging system is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The optical imaging system also has the advantages of variable aperture, large image surface, telescopic optical lens and the like, can realize multi-gear change of the aperture on the premise of not compressing the working space of the lens, and is suitable for clear imaging requirements under various light conditions.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens has the characteristics 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 lens center to the lens periphery, 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 constituting the optical imaging system can be varied to obtain the various results and advantages described in the present specification without departing from the claimed technical solution. 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 five is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 8, an optical imaging system of the first example of the present application is described. Fig. 1 shows a schematic diagram illustrating an example of the configuration of an optical imaging system in the a state. Fig. 2 shows a schematic configuration diagram of an optical imaging system in a B state as an example.

As shown in fig. 1 and fig. 2, the optical imaging system includes, in order from an object side to an image 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 plane S17.

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

In this example, the total effective focal length F of the optical imaging system is 8.93mm, the total length TTL of the optical imaging system is 11.64mm, the image height ImgH is 8.36mm, the F-number FnoA of the optical imaging system in the a state is 1.66, the F-number FnoB of the optical imaging system in the B state is 4.00, the distance D1A between the stop STO and the surface S1 of the first lens facing the object side in the a state of the optical imaging system is-0.43 mm, and the distance D1B between the stop STO and the surface S1 of the first lens facing the object side in the B state of the optical imaging system is 0.08mm.

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, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 1

In the first example, a surface facing the object side and a surface facing the image side of any one of the first to seventh lenses E1 to E7 are aspheric, and a surface type of each aspheric lens can be defined by, but 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 =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 coefficients of the higher-order terms A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirror surfaces S1-S14 in example one.

TABLE 2

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

As can be seen from fig. 3 to 5, the optical imaging system of the first example can achieve good imaging quality in the a state.

Fig. 6 shows an on-axis chromatic aberration curve in the B state of the optical imaging system of example one, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging system. Fig. 7 shows an astigmatism curve in the B state of the optical imaging system of example one, which represents meridional field curvature and sagittal field curvature. Fig. 8 shows distortion curves in the B state of the optical imaging system of example one, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 6 to 8, the optical imaging system of the first example can achieve good imaging quality in the B state.

Example two

As shown in fig. 9 to 16, 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. 9 shows a schematic diagram of the configuration of an optical imaging system in the a state of example two. Fig. 10 shows a schematic structural diagram of an optical imaging system in the B state of example two.

As shown in fig. 9 and fig. 10, the optical imaging system includes, in order from an object side to an image 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 plane S17.

In this example, the total effective focal length F of the optical imaging system is 8.82mm, the total length TTL of the optical imaging system is 11.52mm, the image height ImgH is 8.36mm, the F-number FnoA of the optical imaging system in the a state is 1.60, the F-number FnoB of the optical imaging system in the B state is 4.00, the distance D1A between the stop STO and the surface S1 of the first lens facing the object side in the a state of the optical imaging system is-0.43 mm, and the distance D1B between the stop STO and the surface S1 of the first lens facing the object side in the B state of the optical imaging system is 0.08mm.

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

TABLE 4

Fig. 11 shows an on-axis chromatic aberration curve in the a state of the optical imaging system of example two, which indicates that the converging focal points of light rays of different wavelengths are deviated after passing through the optical imaging system. Fig. 12 shows astigmatism curves in the a state of the optical imaging system of the second example, which represent meridional field curvature and sagittal field curvature. Fig. 13 shows distortion curves in the a state of the optical imaging system of example two, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 11 to 13, the optical imaging system of example two can achieve good imaging quality in the a state.

Fig. 14 shows an on-axis chromatic aberration curve in the B state of the optical imaging system of example two, which indicates that the converging focal points of light rays of different wavelengths are deviated after passing through the optical imaging system. Fig. 15 shows astigmatism curves in the B state of the optical imaging system of the second example, which represent meridional field curvature and sagittal field curvature. Fig. 16 shows a distortion curve in the B state of the optical imaging system of example two, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 14 to 16, the optical imaging system of example two can achieve good imaging quality in the B state.

Example III

As shown in fig. 17 to 24, an optical imaging system of example three of the present application is described. Fig. 17 shows a schematic diagram of an optical imaging system configuration in the a state of example three. Fig. 18 shows a schematic configuration diagram of an optical imaging system in the B state of example three.

As shown in fig. 17 and fig. 18, the optical imaging system includes, in order from an object side to an image 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 plane S17.

The first lens E1 has positive refractive power, a surface S1 of the first lens facing the object side is convex, and a surface S2 of the first lens facing the image side is concave. The second lens E2 has negative refractive power, and a surface S3 facing the object side of the second lens is convex, and a surface S4 facing the image side of the second lens is concave. The third lens E3 has positive refractive power, and a surface S5 facing the object side of the third lens is concave, and a surface S6 facing the image side of the third lens is convex. The fourth lens E4 has positive refractive power, and a surface S7 facing the object side of the fourth lens is convex, and a surface S8 facing the image side of the fourth lens is concave. The fifth lens E5 has negative refractive power, and a surface S9 facing the object side of the fifth lens is concave, and a surface S10 facing the image side of the fifth lens is convex. The sixth lens E6 has positive refractive power, and a surface S11 facing the object side of the sixth lens is convex, and a surface S12 facing the image side of the sixth lens is convex. The seventh lens E7 has negative refractive power, and a surface S13 facing the object side of the seventh lens is convex, and a surface S14 facing the image side of the seventh lens is concave. Filter E8 has a surface S15 facing the object side and a surface S16 facing the image side. 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 8.95mm, the total length TTL of the optical imaging system is 11.60mm, the image height ImgH is 8.36mm, the F-number FnoA of the optical imaging system in the a state is 1.66, the F-number FnoB of the optical imaging system in the B state is 4.01, the distance D1A between the stop STO and the surface S1 of the first lens facing the object side in the a state of the optical imaging system is-0.43 mm, and the distance D1B between the stop STO and the surface S1 of the first lens facing the object side in the B state of the optical imaging system is 0.08mm.

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.1786E-04

-8.6816E-05

2.3036E-05

-7.6456E-06

2.0771E-06

-4.7309E-07

5.8380E-08

S2

-8.3895E-04

3.1313E-03

-2.0546E-03

8.2490E-04

-2.1939E-04

3.7986E-05

-4.1284E-06

S3

-1.2018E-02

5.9176E-03

-5.4639E-04

-2.2229E-03

2.3443E-03

-1.3296E-03

4.9214E-04

S4

-1.2131E-02

1.9354E-03

2.3383E-03

-2.7822E-03

8.6715E-04

8.7654E-04

-1.2018E-03

S5

-3.2047E-03

4.3192E-03

-1.1440E-02

1.7597E-02

-1.8203E-02

1.3208E-02

-6.8885E-03

S6

-7.2982E-02

1.2314E-01

-1.6251E-01

1.5700E-01

-1.1199E-01

5.9668E-02

-2.3910E-02

S7

-6.6426E-02

9.6799E-02

-1.2184E-01

1.1142E-01

-7.4852E-02

3.7437E-02

-1.4047E-02

S8

-9.2138E-03

2.0541E-03

1.0586E-04

-2.0797E-03

2.2112E-03

-1.2801E-03

4.8515E-04

S9

-1.1232E-02

1.1231E-02

-8.4764E-03

5.0990E-03

-2.4494E-03

9.1838E-04

-2.6249E-04

S10

-4.0503E-02

1.9732E-02

-9.6319E-03

3.8019E-03

-1.1957E-03

3.0017E-04

-6.0373E-05

S11

-3.5553E-02

1.2661E-02

-5.2328E-03

1.9249E-03

-6.3671E-04

1.7582E-04

-3.8177E-05

S12

-6.8833E-03

1.5097E-03

-3.3974E-04

1.0888E-04

-6.6785E-05

2.7526E-05

-7.1371E-06

S13

-3.0299E-02

2.4026E-03

-1.9423E-05

-2.2882E-05

3.1425E-06

-1.9853E-07

4.5982E-09

S14

-3.3650E-02

4.3607E-03

-4.6435E-04

3.8559E-05

-2.4989E-06

1.2772E-07

-5.1803E-09

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.9854E-09

1.0158E-10

0.0000E+00

S2

2.5593E-07

-6.9271E-09

0.0000E+00

S3

-1.2308E-04

2.0278E-05

-1.9648E-06

6.0444E-08

8.6191E-09

-1.0179E-09

3.4088E-11

S4

7.1882E-04

-2.6538E-04

6.4891E-05

-1.0568E-05

1.1051E-06

-6.7254E-08

1.8128E-09

S5

2.6143E-03

-7.2303E-04

1.4424E-04

-2.0228E-05

1.8932E-06

-1.0625E-07

2.7062E-09

S6

7.2080E-03

-1.6229E-03

2.6828E-04

-3.1561E-05

2.4976E-06

-1.1903E-07

2.5789E-09

S7

3.9578E-03

-8.3182E-04

1.2829E-04

-1.4079E-05

1.0397E-06

-4.6269E-08

9.3678E-10

S8

-1.2770E-04

2.3824E-05

-3.1456E-06

2.8764E-07

-1.7330E-08

6.1861E-10

-9.9017E-12

S9

5.6445E-05

-9.0169E-06

1.0497E-06

-8.6247E-08

4.7287E-09

-1.5500E-10

2.2948E-12

S10

9.7557E-06

-1.2567E-06

1.2591E-07

-9.3856E-09

4.8527E-10

-1.5396E-11

2.2410E-13

S11

6.2909E-06

-7.6887E-07

6.8244E-08

-4.2699E-09

1.7865E-10

-4.4891E-12

5.1209E-14

S12

1.2313E-06

-1.4532E-07

1.1784E-08

-6.4559E-10

2.2822E-11

-4.6979E-13

4.2760E-15

S13

2.1749E-10

-2.2344E-11

8.9977E-13

-2.1108E-14

3.0044E-16

-2.4170E-18

8.4691E-21

S14

1.6682E-10

-4.2337E-12

8.2940E-14

-1.2048E-15

1.2115E-17

-7.4582E-20

2.1007E-22

TABLE 6

Fig. 19 shows an on-axis chromatic aberration curve in the a state 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. 20 shows astigmatism curves in the a state of the optical imaging system of example three, which represent meridional field curvature and sagittal field curvature. Fig. 21 shows distortion curves in the a state of the optical imaging system of example three, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 19 to 21, the optical imaging system given in example three can achieve good imaging quality in the a state.

Fig. 22 shows an on-axis chromatic aberration curve in the B state of the optical imaging system of example three, which indicates that the converging focal points of light rays of different wavelengths are deviated after passing through the optical imaging system. Fig. 23 shows astigmatism curves in the B state of the optical imaging system of example three, which represent meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves in the B state of the optical imaging system of example three, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 22 to 24, the optical imaging system of example three can achieve good imaging quality in the B state.

Example four

As shown in fig. 25 to 32, an optical imaging system of example four of the present application is described. Fig. 25 shows a schematic diagram of an optical imaging system configuration in the a state of example four. Fig. 26 shows a schematic configuration diagram of an optical imaging system in the B state as an example four.

As shown in fig. 25 and fig. 26, the optical imaging system includes, in order from an object side to an image 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 plane S17.

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

In this example, the total effective focal length F of the optical imaging system is 8.92mm, the total length TTL of the optical imaging system is 11.72mm, the image height ImgH is 8.36mm, the F-number FnoA of the optical imaging system in the a state is 1.66, the F-number FnoB of the optical imaging system in the B state is 4.00, the distance D1A between the stop STO and the surface S1 of the first lens facing the object side in the a state of the optical imaging system is-0.43 mm, and the distance D1B between the stop STO and the surface S1 of the first lens facing the object side in the B state of the optical imaging system is 0.08mm.

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.8564E-04

-6.4597E-05

7.1573E-06

2.1209E-06

-1.9381E-06

4.3338E-07

-5.2346E-08

S2

1.3552E-03

1.3194E-03

-1.0386E-03

4.3078E-04

-1.2047E-04

2.2341E-05

-2.6388E-06

S3

-9.0570E-03

4.4823E-03

-8.4090E-04

-1.1510E-03

1.5269E-03

-1.0270E-03

4.5987E-04

S4

-1.1801E-02

1.4825E-03

6.6938E-03

-1.4771E-02

1.9095E-02

-1.6785E-02

1.0418E-02

S5

-5.6070E-03

1.4712E-03

-1.5190E-03

-3.7219E-04

3.3346E-03

-4.7334E-03

3.7670E-03

S6

-1.9529E-02

9.8251E-03

-9.0300E-03

1.0801E-02

-1.0394E-02

7.2430E-03

-3.6641E-03

S7

-1.6962E-02

3.8698E-03

-1.7599E-03

1.1043E-03

-2.7145E-04

-2.9358E-04

3.3681E-04

S8

-1.5337E-03

-4.5523E-03

4.5157E-03

-4.5614E-03

3.6033E-03

-2.0342E-03

8.1887E-04

S9

1.0301E-02

4.1954E-04

-2.6359E-03

1.8047E-03

-8.0328E-04

2.7618E-04

-7.5382E-05

S10

-5.0101E-02

3.7774E-02

-2.4207E-02

1.2329E-02

-5.0287E-03

1.6214E-03

-4.0599E-04

S11

-6.7547E-02

3.5649E-02

-1.7517E-02

7.0406E-03

-2.2524E-03

5.5621E-04

-1.0440E-04

S12

-2.1751E-02

5.6853E-03

-1.2874E-03

3.0523E-04

-9.8793E-05

2.7791E-05

-5.5203E-06

S13

-1.0000E-02

-3.6988E-03

2.9168E-04

1.0854E-04

-3.0578E-05

3.9079E-06

-3.1047E-07

S14

-3.9304E-06

-9.8973E-03

2.6771E-03

-4.3039E-04

4.8394E-05

-3.9899E-06

2.4430E-07

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

2.7759E-09

-5.1213E-11

0.0000E+00

S2

1.7909E-07

-5.3031E-09

0.0000E+00

S3

-1.4533E-04

3.2842E-05

-5.2624E-06

5.8162E-07

-4.1966E-08

1.7692E-09

-3.2839E-11

S4

-4.6334E-03

1.4809E-03

-3.3695E-04

5.3218E-05

-5.5413E-06

3.4183E-07

-9.4576E-09

S5

-1.9578E-03

6.9775E-04

-1.7244E-04

2.9121E-05

-3.2105E-06

2.0838E-07

-6.0406E-09

S6

1.3530E-03

-3.6317E-04

6.9798E-05

-9.3232E-06

8.1921E-07

-4.2445E-08

9.7993E-10

S7

-1.7373E-04

5.5710E-05

-1.1916E-05

1.7115E-06

-1.5924E-07

8.6997E-09

-2.1230E-10

S8

-2.3707E-04

4.9484E-05

-7.3817E-06

7.6758E-07

-5.2843E-08

2.1640E-09

-3.9889E-11

S9

1.6350E-05

-2.7563E-06

3.4590E-07

-3.0518E-08

1.7562E-09

-5.8294E-11

8.3446E-13

S10

7.7678E-05

-1.1164E-05

1.1785E-06

-8.8335E-08

4.4380E-09

-1.3374E-10

1.8242E-12

S11

1.4759E-05

-1.5559E-06

1.2028E-07

-6.6229E-09

2.4608E-10

-5.5349E-12

5.6930E-14

S12

7.6175E-07

-7.3487E-08

4.9366E-09

-2.2587E-10

6.6905E-12

-1.1513E-13

8.6771E-16

S13

1.6737E-08

-6.3257E-10

1.6850E-11

-3.1085E-13

3.7876E-15

-2.7455E-17

8.9728E-20

S14

-1.1101E-08

3.7135E-10

-8.9969E-12

1.5326E-13

-1.7388E-15

1.1786E-17

-3.6093E-20

TABLE 8

Fig. 27 shows an on-axis chromatic aberration curve in the a state 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. 28 shows an astigmatism curve in the a state of the optical imaging system of example four, which represents meridional field curvature and sagittal field curvature. Fig. 29 shows a distortion curve in the a state of the optical imaging system of example four, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 27 to 29, the optical imaging system given in example four can achieve good imaging quality in the a state.

Fig. 30 shows an on-axis chromatic aberration curve in the B state 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. 31 shows an astigmatism curve in the B state of the optical imaging system of example four, which represents meridional field curvature and sagittal field curvature. Fig. 32 shows distortion curves in the B state of the optical imaging system of example four, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 30 to 32, the optical imaging system according to example four can achieve good imaging quality in the B state.

Example five

As shown in fig. 33 to 40, an optical imaging system of example five of the present application is described. Fig. 33 is a schematic diagram showing the configuration of an optical imaging system in the a state of example five. Fig. 34 shows a schematic configuration diagram of an optical imaging system in the B state of example five.

As shown in fig. 33 and fig. 34, the optical imaging system includes, in order from an object side to an image 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 plane S17.

The first lens E1 has positive refractive power, and a surface S1 of the first lens facing the object side is convex, and a surface S2 of the first lens facing the image side is concave. The second lens E2 has negative refractive power, and a surface S3 facing the object side of the second lens is convex, and a surface S4 facing the image side of the second lens is concave. The third lens E3 has positive refractive power, and a surface S5 facing the object side of the third lens is concave, and a surface S6 facing the image side of the third lens is convex. The fourth lens E4 has negative refractive power, and a surface S7 facing the object side of the fourth lens is convex, and a surface S8 facing the image side of the fourth lens is concave. The fifth lens E5 has negative refractive power, and a surface S9 facing the object side of the fifth lens is concave, and a surface S10 facing the image side of the fifth lens is concave. The sixth lens E6 has positive refractive power, and a surface S11 facing the object side of the sixth lens is convex, and a surface S12 facing the image side of the sixth lens is convex. The seventh lens E7 has negative refractive power, and a surface S13 facing the object side of the seventh lens is convex, and a surface S14 facing the image side of the seventh lens is concave. Filter E8 has a surface S15 facing the object side and a surface S16 facing the image side. 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 9.05mm, the total length TTL of the optical imaging system is 11.67mm, the image height ImgH is 8.37mm, the F-number FnoA of the optical imaging system in the a state is 1.66, the F-number FnoB of the optical imaging system in the B state is 4.00, the distance D1A between the stop STO and the surface S1 of the first lens facing the object side in the a state of the optical imaging system is-0.43 mm, and the distance D1B between the stop STO and the surface S1 of the first lens facing the object side in the B state of the optical imaging system is 0.08mm.

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, the thickness/distance, and the 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.

Watch 10

Fig. 35 shows an on-axis chromatic aberration curve in the a state 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. 36 shows astigmatism curves in the a state of the optical imaging system of example five, which represent meridional field curvature and sagittal field curvature. Fig. 37 shows distortion curves in the a state of the optical imaging system of example five, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 35 to 37, the optical imaging system given in example five can achieve good imaging quality in the a state.

Fig. 38 shows an on-axis chromatic aberration curve in the B state 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. 39 shows astigmatism curves in the B state of the optical imaging system of example five, which represent meridional field curvature and sagittal field curvature. Fig. 40 shows distortion curves in the B state of the optical imaging system of example five, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 38 to 40, the optical imaging system according to example five can achieve good imaging quality in the B state.

To sum up, examples one to five respectively satisfy the relationships shown in table 11.

Conditional expressions/examples	1	2	3	4	5
						(EPDA-EPDB)(mm)	3.15	3.31	3.16	3.14	3.19
(R2-R1)/f1	2.37	2.52	2.56	4.39	2.65
						(f3-f2)/(f3+f2)	4.94	4.42	2.19	2.36	4.26
(R6-R5)/(R3+R4)	1.23	1.14	0.86	1.36	1.20
						f5/R9	2.04	1.85	1.78	2.35	1.75
f6/R11	1.51	1.53	1.59	2.87	1.57
						f12/(CT1+CT2+T23)	6.09	6.11	6.18	5.61	6.13
f34/f56	2.73	2.58	2.32	0.68	2.45
						f123456/(T67+CT7)	2.59	2.57	2.60	3.34	2.59
(SAG61+SAG62)/(SAG51+SAG52)	1.47	1.43	1.42	0.51	1.52
						(ET2+ET3+ET4)/ET7	1.54	1.08	1.06	2.92	1.19

TABLE 11

Table 12 gives the effective focal lengths f, f1 to f7 of the respective lenses, of the optical imaging systems of example one to example five.

TABLE 12

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 some of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts 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 forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

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:

a diaphragm, the diaphragm being movable;

a first lens having a positive refractive power;

a second lens with negative refractive power, wherein the surface of the second lens facing the object side is a convex shape, and the surface of the second lens facing the image side is a concave shape;

a third lens with positive refractive power, wherein the surface of the third lens facing the object side is a concave shape, and the surface of the third lens facing the image side is a convex shape;

a fourth lens with refractive power, wherein the surface of the fourth lens facing the object side is a convex shape, and the surface of the fourth lens facing the image side is a concave shape;

a fifth lens having negative refractive power;

a sixth lens having positive refractive power, a surface of the sixth lens facing the object side being convex;

a seventh optic having refractive power;

wherein an entrance pupil diameter EPDA of the optical imaging system in the A state and an entrance pupil diameter EPDB of the optical imaging system in the B state satisfy: 2.8mm < (EPDA-EPDB) <3.8mm.

2. The optical imaging system of claim 1, wherein the radius of curvature R1 of the surface of the first lens facing the object side, the radius of curvature R2 of the surface of the first lens facing the image side, and the effective focal length f1 of the first lens satisfy: 2.0< (R2-R1)/f 1<4.5.

3. The optical imaging system of claim 1, wherein the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 2.0< (f 3-f 2)/(f 3+ f 2) <6.4.

4. The optical imaging system of claim 1, wherein the radius of curvature R3 of the surface of the second lens facing the object side, the radius of curvature R4 of the surface of the second lens facing the image side, the radius of curvature R5 of the surface of the third lens facing the object side, and the radius of curvature R6 of the surface of the third lens facing the image side satisfy: 0.6< (R6-R5)/(R3 + R4) <1.6.

5. The optical imaging system of claim 1, wherein an effective focal length f5 of the fifth lens and a radius of curvature R9 of a surface of the fifth lens facing the object side satisfy: 1.5 were woven so as to have f5/R9<3.3.

6. The optical imaging system of claim 1, wherein an effective focal length f6 of the sixth lens and a radius of curvature R11 of a surface of the sixth lens facing the object side satisfy: 1.3 were woven so as to have f6/R11<3.0.

7. The optical imaging system of claim 1, wherein a composite focal length f12 of the first lens and the second lens, a central thickness CT1 of the first lens on an optical axis of the optical imaging system, a central thickness CT2 of the second lens on the optical axis of the optical imaging system, and an air interval T23 of the second lens and the third lens on the optical axis of the optical imaging system satisfy: 5.5 were woven so as to be f12/(CT 1+ CT2+ T23) <6.7.

8. The optical imaging system of claim 1, wherein a combined focal length f34 of the third and fourth lenses and a combined focal length f56 of the fifth and sixth lenses satisfy: 0.5 were woven so as to have f34/f56<2.9.

9. The optical imaging system of claim 1, wherein a combined focal length f123456 of the first, second, third, fourth, fifth and sixth lenses, an air space T67 of the sixth and seventh lenses on an optical axis of the optical imaging system, a center thickness CT7 of the seventh lens on the optical axis of the optical imaging system, satisfy: 2.2 were woven fabric f123456/(T67 + CT 7) <3.6.

10. The optical imaging system of claim 1, wherein an axial distance SAG61 from an intersection point of the sixth lens surface facing the object side and the optical axis of the optical imaging system to an effective radius vertex of the sixth lens surface facing the object side, an axial distance SAG62 from an intersection point of the sixth lens surface facing the image side and the optical axis of the optical imaging system to an effective radius vertex of the sixth lens surface facing the image side, an axial distance SAG51 from an intersection point of the fifth lens surface facing the object side and the optical axis of the optical imaging system to an effective radius vertex of the fifth lens surface facing the object side, and an axial distance SAG52 from an intersection point of the fifth lens surface facing the image side and the optical axis of the optical imaging system to an effective radius vertex of the fifth lens surface facing the image side satisfy: 0.3< (SAG 61+ SAG 62)/(SAG 51+ SAG 52) <1.7.

11. The optical imaging system according to claim 1, wherein the edge thickness ET2 of the second lens piece, the edge thickness ET3 of the third lens piece, the edge thickness ET4 of the fourth lens piece and the edge thickness ET7 of the seventh lens piece satisfy: 0.8< (ET 2+ ET3+ ET 4)/ET 7<3.1.

12. An optical imaging system, comprising:

a diaphragm, the diaphragm being movable;

a first lens having a positive refractive power;

a fourth lens with refractive power, wherein the surface of the fourth lens facing the object side is convex, and the surface of the fourth lens facing the image side is concave;

a fifth lens having negative refractive power;

a seventh lens having refractive power;

wherein, the composite focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens on the optical axis of the optical imaging system, the central thickness CT2 of the second lens on the optical axis of the optical imaging system, and the air interval T23 of the second lens and the third lens on the optical axis of the optical imaging system satisfy: 5.5 are sq f12/(CT 1+ CT2+ T23) <6.7.

13. The optical imaging system of claim 12, wherein the radius of curvature R1 of the surface of the first lens facing the object side, the radius of curvature R2 of the surface of the first lens facing the image side, and the effective focal length f1 of the first lens satisfy: 2.0< (R2-R1)/f 1<4.5.

14. The optical imaging system of claim 12, wherein the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 2.0< (f 3-f 2)/(f 3+ f 2) <6.4.

15. The optical imaging system of claim 12, wherein the radius of curvature R3 of the surface of the second lens facing the object side, the radius of curvature R4 of the surface of the second lens facing the image side, the radius of curvature R5 of the surface of the third lens facing the object side, and the radius of curvature R6 of the surface of the third lens facing the image side satisfy: 0.6< (R6-R5)/(R3 + R4) <1.6.

16. The optical imaging system according to claim 12, wherein an effective focal length f5 of the fifth lens and a radius of curvature R9 of a surface of the fifth lens facing the object side satisfy: 1.5 were < -f5/R9 <3.3.

17. The optical imaging system of claim 12, wherein the effective focal length f6 of the sixth lens and the radius of curvature R11 of the surface of the sixth lens facing the object side satisfy: 1.3 were woven so as to have f6/R11<3.0.

18. The optical imaging system of claim 12, wherein a combined focal length f34 of the third and fourth lenses and a combined focal length f56 of the fifth and sixth lenses satisfy: 0.5 were woven so as to have f34/f56<2.9.

19. The optical imaging system of claim 12, wherein a combined focal length f123456 of the first, second, third, fourth, fifth and sixth lenses, an air space T67 of the sixth and seventh lenses on an optical axis of the optical imaging system, a center thickness CT7 of the seventh lens on the optical axis of the optical imaging system, satisfy: 2.2 were woven fabric f123456/(T67 + CT 7) <3.6.

20. The optical imaging system according to claim 12, wherein an on-axis distance SAG61 from an intersection point of a surface of the sixth lens facing the object side and an optical axis of the optical imaging system to an effective radius vertex of the surface of the sixth lens facing the object side, an on-axis distance SAG62 from an intersection point of the surface of the sixth lens facing the image side and the optical axis of the optical imaging system to an effective radius vertex of a surface of the sixth lens facing the image side, an on-axis distance SAG51 from an intersection point of a surface of the fifth lens facing the object side and the optical axis of the optical imaging system to an effective radius vertex of a surface of the fifth lens facing the object side, and an on-axis distance SAG52 from an intersection point of the surface of the fifth lens facing the image side and the optical axis of the optical imaging system to an effective radius vertex of a surface of the fifth lens facing the object side satisfy: 0.3< (SAG 61+ SAG 62)/(SAG 51+ SAG 52) <1.7.

21. The optical imaging system of claim 12, wherein the edge thickness ET2 of the second lens piece, the edge thickness ET3 of the third lens piece, the edge thickness ET4 of the fourth lens piece and the edge thickness ET7 of the seventh lens piece satisfy: 0.8< (ET 2+ ET3+ ET 4)/ET 7<3.1.