CN114815168A

CN114815168A - Optical imaging lens

Info

Publication number: CN114815168A
Application number: CN202210591047.4A
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: 2022-07-29
Anticipated expiration: 2042-05-27
Also published as: CN114815168B

Abstract

The present invention provides an optical imaging lens, including: the diaphragm is movable; the first lens has positive focal power; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object-side surface of the third lens is a concave surface, and the image-side surface of the third lens is a convex surface; the fourth lens has focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has negative focal power; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the seventh lens has focal power; the effective focal length f of the optical imaging lens, the entrance pupil diameter EPDA of the optical imaging lens in the A state and the entrance pupil diameter EPDB of the optical imaging lens in the B state satisfy the following conditions: 20mm < f EPDA/EPDB <25 mm. The invention solves the problem of poor imaging quality of the optical imaging lens in the complex light environment in the prior art.

Description

Optical imaging lens

Technical Field

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

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, and the size of the mobile phone lens is required to be smaller and smaller, but due to the limitation of the narrow space of the mobile phone, the difficulty of obtaining a high-quality image by the mobile phone lens in a complex light environment is increased.

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

Disclosure of Invention

The invention mainly aims to provide an optical imaging lens to solve the problem that the optical imaging lens in the prior art is poor in imaging quality in a complex light environment.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens comprising: the diaphragm is movable; a first lens having a positive refractive power; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens has focal power, the object-side surface of the fourth lens is a convex surface, and the image-side surface of the fourth lens is a concave surface; a fifth lens having a negative focal power; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; a seventh lens having optical power; the effective focal length f of the optical imaging lens, the entrance pupil diameter EPDA of the optical imaging lens in the A state and the entrance pupil diameter EPDB of the optical imaging lens in the B state satisfy the following conditions: 20mm < f EPDA/EPDB <25 mm.

Further, the effective focal length f of the optical imaging lens and the half field angle HFOV of the optical imaging lens satisfy: 6.8mm < f tan (HFOV) <8.6 mm.

Further, the entrance pupil diameter EPDA of the optical imaging lens in the a state and the entrance pupil diameter EPDB of the optical imaging lens in the B state satisfy: 2.8mm < (EPDA-EPDB) <3.8 mm.

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

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

Further, a radius of curvature R3 of the object-side surface of the second lens, a radius of curvature R4 of the image-side surface of the second lens, a radius of curvature R5 of the object-side surface of the third lens, and a radius of curvature R6 of the image-side surface of the third lens 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 object side surface of the fifth lens satisfy: 1.5< f5/R9< 3.3.

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

Further, the composite focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis of the optical imaging lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the air interval T23 of the second lens and the third lens on the optical axis of the optical imaging lens satisfy: 5.5< f12/(CT1+ 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: 0.5< f34/f56< 2.9.

Further, a composite focal length f123456 of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, an air space T67 of the sixth lens and the seventh lens on the optical axis of the optical imaging lens, and a center thickness CT7 of the seventh lens on the optical axis of the optical imaging lens satisfy: 2.2< f123456/(T67+ CT7) < 3.6.

Further, an on-axis distance SAG61 between an intersection point of the object-side surface of the sixth lens and the optical axis of the optical imaging lens and an effective radius vertex of the object-side surface of the sixth lens, an on-axis distance SAG62 between an intersection point of the image-side surface of the sixth lens and the optical axis of the optical imaging lens and an effective radius vertex of the image-side surface of the sixth lens, an on-axis distance SAG51 between an intersection point of the object-side surface of the fifth lens and the optical axis of the optical imaging lens and an effective radius vertex of the object-side surface of the fifth lens, and an on-axis distance SAG52 between an intersection point of the image-side surface of the fifth lens and the optical axis of the optical imaging lens and an effective radius vertex of the image-side surface of the fifth lens satisfy: 0.3< (SAG61+ SAG62)/(SAG51+ SAG52) < 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< (ET2+ ET3+ ET4)/ET7< 3.1.

According to another aspect of the present invention, there is provided an optical imaging lens including: the diaphragm is movable; a first lens having a positive refractive power; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens has focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; a fifth lens having a negative focal power; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; a seventh lens having optical power; the effective focal length f of the optical imaging lens and the half field angle HFOV of the optical imaging lens meet the following requirements: 6.8mm < f tan (HFOV) <8.6 mm.

By applying the technical scheme of the invention, the optical imaging lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The diaphragm is movable; the first lens has positive focal power; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens has focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has negative focal power; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the seventh lens has focal power; the effective focal length f of the optical imaging lens, the entrance pupil diameter EPDA of the optical imaging lens in the A state and the entrance pupil diameter EPDB of the optical imaging lens in the B state satisfy the following conditions: 20mm < f EPDA/EPDB <25 mm.

Through the optical power of each lens of rational distribution, be favorable to balancing the aberration that optical imaging lens produced, can avoid the great deflection to appear in the light path simultaneously, greatly increased optical imaging lens's image quality. The first lens, the third lens and the sixth lens have positive focal power, light can be effectively converged, the second lens and the fifth lens have negative focal power, and the positive focal power and the negative focal power are distributed in a staggered mode, so that the phenomenon that the focal power is too concentrated to cause strange shape of a local lens and the lens is difficult to process is avoided. The F-star EPDA/EPDB is limited within a reasonable range, the size of the diameter of the 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 lens has enough luminous flux and radiation illumination, the requirement that the optical imaging lens meets clear imaging under different light environments is met, and the effect that the optical imaging lens can clearly image under the complex light environment is effectively realized.

Drawings

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

FIG. 1 is a schematic diagram of an optical imaging lens in the A state according to an example of the present invention;

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

fig. 3 to 5 illustrate an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of fig. 1;

fig. 6 to 8 illustrate an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens in fig. 2;

FIG. 9 is a schematic view showing the structure of an optical imaging lens in the A state according to the second example of the present invention;

FIG. 10 is a schematic view showing the structure of an optical imaging lens in the B state according to example two of the present invention;

fig. 11 to 13 illustrate an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens in fig. 9;

fig. 14 to 16 show axial chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging lens in fig. 10;

fig. 17 is a schematic structural view showing an optical imaging lens in the a state according to example three of the present invention;

FIG. 18 is a schematic diagram showing the structure of an optical imaging lens in the B state according to example three of the present invention;

fig. 19 to 21 show axial chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging lens in fig. 17;

fig. 22 to 24 show axial chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging lens in fig. 18;

FIG. 25 is a schematic diagram showing a configuration of an optical imaging lens in the A state according to example four of the present invention;

FIG. 26 is a schematic diagram showing the structure of an optical imaging lens in the B state according to example four of the present invention;

fig. 27 to 29 show axial chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging lens in fig. 25;

fig. 30 to 32 show axial chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging lens in fig. 26;

fig. 33 is a schematic view showing the configuration of an optical imaging lens in the a state according to example five of the present invention;

FIG. 34 is a schematic diagram showing the structure of an optical imaging lens in the B state according to example five of the present invention;

fig. 35 to 37 show axial chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging lens in fig. 33;

fig. 38 to 40 show axial chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging lens in fig. 34.

Wherein the figures include the following reference numerals:

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

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

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

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. For the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

Herein, the a state refers to a state when the optical imaging lens entrance pupil diameter is maximum, and the B state refers to a state when the optical imaging lens entrance pupil diameter is minimum. That is, EPDA represents the maximum adjustable entrance pupil diameter of the optical imaging lens, and EPDB represents the minimum adjustable entrance pupil diameter of the optical imaging lens.

The invention mainly provides an optical imaging lens, aiming at solving the problem that the optical imaging lens in the prior art has poor imaging quality in a complex light environment.

Example one

As shown in fig. 1 to 40, the optical imaging lens includes a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The diaphragm is movable; the first lens has positive focal power; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens has focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has negative focal power; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the seventh lens has focal power; the effective focal length f of the optical imaging lens, the entrance pupil diameter EPDA of the optical imaging lens in the A state and the entrance pupil diameter EPDB of the optical imaging lens in the B state satisfy the following conditions: 20mm < f EPDA/EPDB <25 mm.

Through the optical power of each lens of rational distribution, be favorable to balancing the aberration that optical imaging lens produced, can avoid the great deflection to appear in the light path simultaneously, greatly increased optical imaging lens's image quality. The first lens, the third lens and the sixth lens have positive focal power, light can be effectively converged, the second lens and the fifth lens have negative focal power, and the positive focal power and the negative focal power are distributed in a staggered mode, so that the phenomenon that the focal power is too concentrated to cause strange shape of a local lens and the lens is difficult to process is avoided. By limiting F EPDA/EPDB in a reasonable range, the size of the diameter of the 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 lens has enough luminous flux and radiation illumination, the requirement that the optical imaging lens meets clear imaging under different light environments is ensured, and the effect that the optical imaging lens can clearly image under the complex light environment is effectively realized.

Preferably, the effective focal length f of the optical imaging lens, the entrance pupil diameter EPDA of the optical imaging lens in the a state, and the entrance pupil diameter EPDB of the optical imaging lens in the B state satisfy: 21mm < f EPDA/EPDB <23 mm.

In the present embodiment, the effective focal length f of the optical imaging lens and the half field angle HFOV of the optical imaging lens satisfy: 6.8mm < f tan (HFOV) <8.6 mm. By controlling f tan (hfov) within a reasonable range, the distortion range of the optical imaging lens can be controlled, the optical imaging lens is ensured to have a sufficiently large field angle, the wide-angle characteristic of the optical imaging lens is maintained, and the optical imaging lens is ensured to form a clear image within a large image plane range. Preferably, 7.0mm < f tan (hfov) <8.2 mm.

In the present embodiment, the entrance pupil diameter EPDA of the optical imaging lens in the a state and the entrance pupil diameter EPDB of the optical imaging lens in the B state satisfy: 2.8mm < (EPDA-EPDB) <3.8 mm. By limiting the (EPDA-EPDB) within a reasonable range, the effective focal length of the optical imaging lens is restrained, the luminous flux of the optical imaging lens is ensured within a proper range, the function of the iris diaphragm is realized, and the imaging quality of the optical imaging lens is ensured. Preferably, 3.1mm < (EPDA-EPDB) <3.4 mm.

In the present embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy: 2.0< (R2-R1)/f1< 4.5. By limiting (R2-R1)/f1 within a reasonable range, the curvatures of the object side surface of the first lens and the image side surface of the first lens can be reasonably distributed, so that the appearance of the first lens is more favorable for injection molding and assembly, the surface form sensitivity of the first lens is reduced, and the matching of the object side surface of the first lens and the image side surface of the first lens is favorable for reasonably distributing the optical power of the first lens and controlling the deflection trend of the light rays, and simultaneously 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 lens can be effectively balanced, and the imaging quality of the optical imaging lens is ensured. Preferably, 2.1< (R2-R1)/f1< 4.4.

In the present embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 2.0< (f3-f2)/(f3+ f2) < 6.4. By limiting (f3-f2)/(f3+ f2) within a reasonable range, the sensitivities of the second lens and the third lens can be reduced, the aberration contribution amount of the second lens and the third lens can be optimized, the aberration of the optical imaging lens is reduced, and the imaging quality of the optical imaging lens is ensured. Preferably, 2.1< (f3-f2)/(f3+ f2) < 6.3.

In the present embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0.6< (R6-R5)/(R3+ R4) < 1.6. Through restricting (R6-R5)/(R3+ R4) in reasonable within range, can effectively adjust the focal 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 the restriction of technology level for coma and the field curvature etc. of optical imaging lens obtain effective buffering, the spherical aberration and the field curvature of balanced optical imaging lens effectively. Preferably, 0.8< (R6-R5)/(R3+ R4) < 1.5.

In the present embodiment, the effective focal length f5 of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 1.5< f5/R9< 3.3. By limiting f5/R9 within a reasonable range, the curvature and the focal power of the object side surface of the fifth lens 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 lens can be effectively balanced, and the imaging quality of the optical imaging lens is ensured. Preferably, 1.7< f5/R9< 3.2.

In the present embodiment, the effective focal length f6 of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: 1.3< f6/R11< 3.0. By limiting f6/R11 within a reasonable range, the curvature and the focal power of the object side surface of the sixth lens can be reasonably distributed, the deflection trend of light rays can be favorably controlled, and meanwhile, the aberration correction 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 lens can be effectively balanced, and the imaging quality of the optical imaging lens is ensured. Preferably, 1.5< f6/R11< 2.9.

In the present embodiment, the combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis of the optical imaging lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the air interval T23 of the second lens and the third lens on the optical axis of the optical imaging lens satisfy: 5.5< f12/(CT1+ CT2+ T23) < 6.7. The thicknesses of the first lens and the second lens are reasonably distributed by limiting f12/(CT1+ 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 ray 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 matching between the second lens and the third lens are greatly helpful for improving the curvature of field, and the imaging quality of the optical imaging lens is ensured. Preferably, 5.6< f12/(CT1+ CT2+ T23) < 6.6.

In the present 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: 0.5< f34/f56< 2.9. By controlling f34/f56 within a reasonable range, it is beneficial to reduce the sensitivity of the third, fourth, fifth and sixth lenses, avoiding overly tight tolerance requirements. Meanwhile, the deflection angle of light rays is reduced, and the imaging quality of the optical imaging lens is improved. Preferably 0.6< f34/f56< 2.6.

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 lens, and the center thickness CT7 of the seventh lens on the optical axis of the optical imaging lens satisfy: 2.2< f123456/(T67+ CT7) < 3.6. By limiting f123456/(T67+ CT7) 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 sensitivity degree of the lenses can be effectively reduced, the field curvature balance of the optical imaging lens can be effectively controlled, and the optical imaging lens has reasonable field curvature. Preferably, 2.5< f123456/(T67+ CT7) < 3.4.

In this embodiment, an on-axis distance SAG61 between an intersection point of an object-side surface of the sixth lens and the optical axis of the optical imaging lens and an effective radius vertex of the object-side surface of the sixth lens, an on-axis distance SAG62 between an intersection point of an image-side surface of the sixth lens and the optical axis of the optical imaging lens and an effective radius vertex of the image-side surface of the sixth lens, an on-axis distance SAG51 between an intersection point of an object-side surface of the fifth lens and the optical axis of the optical imaging lens and an effective radius vertex of the object-side surface of the fifth lens, and an on-axis distance SAG52 between an intersection point of an image-side surface of the fifth lens and the optical axis of the optical imaging lens and an effective radius vertex of the image-side surface of the fifth lens satisfy: 0.3< (SAG61+ SAG62)/(SAG51+ SAG52) < 1.7. By controlling (SAG61+ SAG62)/(SAG51+ SAG52) in a reasonable range, the problem of overlarge curvature difference between 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 the optical imaging lens 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 and assembly are facilitated. In addition, the total reflection of the lens is weakened, and the performance is improved. Preferably, 0.5< (SAG61+ SAG62)/(SAG51+ SAG52) < 1.6.

In the present embodiment, the edge thicknesses ET2, ET3, ET4 and ET7 of the second, third and fourth lenses satisfy: 0.8< (ET2+ ET3+ ET4)/ET7< 3.1. By controlling (ET2+ ET3+ ET4)/ET7 in a reasonable range, the uniformity and 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 the optical imaging lens is ensured. Preferably, 1.0< (ET2+ ET3+ ET4)/ET7< 3.0.

Example two

As shown in fig. 1 to 40, the optical imaging lens includes a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The diaphragm is movable; the first lens has positive focal power; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object-side surface of the third lens is a concave surface, and the image-side surface of the third lens is a convex surface; the fourth lens has focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has negative focal power; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the seventh lens has focal power; the effective focal length f of the optical imaging lens and the half field angle HFOV of the optical imaging lens meet the following requirements: 6.8mm < f tan (HFOV) <8.6 mm.

Through the optical power of each lens of rational distribution, be favorable to balancing the aberration that optical imaging lens produced, can avoid the great deflection to appear in the light path simultaneously, greatly increased optical imaging lens's image quality. The first lens, the third lens and the sixth lens have positive focal power, light can be effectively converged, the second lens and the fifth lens have negative focal power, and the positive focal power and the negative focal power are distributed in a staggered mode, so that the phenomenon that the focal power is too concentrated to cause strange shape of a local lens and the lens is difficult to process is avoided. By controlling f tan (hfov) within a reasonable range, the distortion range of the optical imaging lens can be controlled, the optical imaging lens is ensured to have a sufficiently large field angle, the wide-angle characteristic of the optical imaging lens is maintained, and the optical imaging lens is ensured to form a clear image within a large image plane range.

Preferably, the effective focal length f of the optical imaging lens and the half field angle HFOV of the optical imaging lens satisfy: 7.0mm < f tan (hfov) <8.2 mm.

In the present embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0.6< (R6-R5)/(R3+ R4) < 1.6. Through restricting (R6-R5)/(R3+ R4) in reasonable scope, can effectively adjust the focal power of second lens and third lens, can avoid because the too big processing degree of difficulty that brings of field angle, avoided the restriction of strict tolerance and process level for coma and the field curvature etc. of optical imaging lens obtain effective buffering, balance optical imaging lens's spherical aberration and field curvature effectively. Preferably, 0.8< (R6-R5)/(R3+ R4) < 1.5.

In the present embodiment, the effective focal length f6 of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: 1.3< f6/R11< 3.0. By limiting f6/R11 within a reasonable range, the curvature and the focal power of the object side surface of the sixth lens 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 lens can be effectively balanced, and the imaging quality of the optical imaging lens is ensured. Preferably, 1.5< f6/R11< 2.9.

In the present embodiment, the combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis of the optical imaging lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the air interval T23 of the second lens and the third lens on the optical axis of the optical imaging lens satisfy: 5.5< f12/(CT1+ CT2+ T23) < 6.7. The thicknesses of the first lens and the second lens are reasonably distributed by limiting f12/(CT1+ 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 ray 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 curvature of field, and the imaging quality of the optical imaging lens is ensured. Preferably, 5.6< f12/(CT1+ CT2+ T23) < 6.6.

In the present embodiment, the edge thicknesses ET2, ET3, ET4 and ET7 of the second lens, the third lens and the fourth lens satisfy: 0.8< (ET2+ ET3+ ET4)/ET7< 3.1. By controlling (ET2+ ET3+ ET4)/ET7 within a reasonable range, the uniformity and 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 assembly of actual molding, demolding and processing is facilitated, and the imaging quality of the optical imaging lens is ensured. Preferably, 1.0< (ET2+ ET3+ ET4)/ET7< 3.0.

Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.

The optical imaging lens in the present application may employ a plurality of lenses, such as the seven lenses described above. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the optical imaging lens 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 lens is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The optical imaging lens 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 meets the requirement of clear imaging 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 is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

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

Examples of specific surface types and parameters applicable to the optical imaging lens of the above-described 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 lens of the first example of the present application is described. Fig. 1 shows a schematic diagram illustrating an example of a configuration of an optical imaging lens in a state a. Fig. 2 shows a schematic configuration diagram of an optical imaging lens in a B state as an example.

As shown in fig. 1 and fig. 2, the optical imaging lens includes, in order from an object side to an image side, a stop STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, a filter E8, and an image plane S17.

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

In this example, the total effective focal length F of the optical imaging lens is 8.89mm, the total length TTL of the optical imaging lens is 11.56mm, the image height ImgH is 8.36mm, the F-number FnoA of the optical imaging lens in the a state is 1.66, the F-number FnoB of the optical imaging lens in the B state is 4.00, the distance D1A between the stop STO and the object-side surface S1 of the first lens in the a state of the optical imaging lens is-0.43 mm, and the distance D1B between the stop STO and the object-side surface S1 of the first lens in the B state of the optical imaging lens is 0.08 mm.

Table 1 shows a basic structural parameter table of the optical imaging lens 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, the object-side surface and the image-side surface of any one of the first lens element E1 through the seventh lens element E7 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S14 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.4770E-06

9.8067E-06

-3.6383E-05

2.2216E-05

-8.3465E-06

1.8988E-06

-2.7322E-07

S2

3.6611E-04

1.3699E-03

-7.8352E-04

2.5361E-04

-5.2590E-05

6.4786E-06

-4.4037E-07

S3

-8.4003E-03

3.7020E-03

-2.0691E-04

-1.6084E-03

1.7844E-03

-1.1230E-03

4.7455E-04

S4

-8.8137E-03

-3.3201E-05

7.6168E-03

-1.4716E-02

1.7434E-02

-1.4199E-02

8.2291E-03

S5

-2.9187E-03

1.5115E-04

-5.6968E-04

-3.2874E-06

7.4436E-04

-8.8946E-04

5.3990E-04

S6

-1.0850E-02

-6.5182E-03

1.7964E-02

-2.1983E-02

1.7388E-02

-9.4867E-03

3.6488E-03

S7

-1.5618E-02

-3.1469E-03

2.8820E-03

1.6692E-03

-5.1988E-03

5.1237E-03

-3.0128E-03

S8

-6.4963E-03

-2.6586E-03

-2.3396E-04

2.1370E-03

-2.0842E-03

1.1854E-03

-4.5507E-04

S9

-1.4782E-03

3.1510E-03

-4.2218E-03

3.4897E-03

-1.9624E-03

7.9264E-04

-2.3368E-04

S10

-1.8877E-02

4.0366E-03

-1.0109E-04

-1.3055E-03

1.0875E-03

-4.9478E-04

1.4837E-04

S11

-1.6774E-02

1.8610E-03

1.0477E-03

-1.4322E-03

7.6173E-04

-2.5323E-04

5.8009E-05

S12

-1.4138E-03

-1.1273E-03

1.4669E-03

-1.0269E-03

4.0908E-04

-1.0765E-04

1.9823E-05

S13

-3.0037E-02

2.5956E-03

-5.3140E-05

-2.8140E-05

5.6417E-06

-5.9168E-07

4.0413E-08

S14

-3.3934E-02

4.5577E-03

-5.0926E-04

4.3754E-05

-2.8380E-06

1.3955E-07

-5.2282E-09

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

2.1469E-08

-7.1542E-10

0.0000E+00

S2

1.4591E-08

-2.2831E-10

0.0000E+00

S3

-1.3966E-04

2.8657E-05

-4.0128E-06

3.6493E-07

-1.9398E-08

4.5677E-10

0.0000E+00

S4

-3.4411E-03

1.0402E-03

-2.2503E-04

3.3946E-05

-3.3895E-06

2.0123E-07

-5.3756E-09

S5

-1.9408E-04

4.0263E-05

-3.4147E-06

-4.1775E-07

1.4361E-07

-1.4897E-08

5.7284E-10

S6

-9.9772E-04

1.9350E-04

-2.6224E-05

2.4035E-06

-1.4002E-07

4.5851E-09

-6.2140E-11

S7

1.1818E-03

-3.2054E-04

6.0465E-05

-7.7990E-06

6.5649E-07

-3.2513E-08

7.1866E-10

S8

1.2281E-04

-2.3504E-05

3.1619E-06

-2.9098E-07

1.7346E-08

-5.9937E-10

9.0315E-12

S9

5.0625E-05

-8.0397E-06

9.2308E-07

-7.4402E-08

3.9846E-09

-1.2709E-10

1.8243E-12

S10

-3.1034E-05

4.6125E-06

-4.8574E-07

3.5426E-08

-1.7001E-09

4.8222E-11

-6.1141E-13

S11

-9.4700E-06

1.1116E-06

-9.3057E-08

5.4139E-09

-2.0754E-10

4.7023E-12

-4.7590E-14

S12

-2.6115E-06

2.4725E-07

-1.6662E-08

7.7869E-10

-2.3969E-11

4.3691E-13

-3.5743E-15

S13

-1.9171E-09

6.4643E-11

-1.5502E-12

2.5908E-14

-2.8733E-16

1.9027E-18

-5.6981E-21

S14

1.4908E-10

-3.2055E-12

5.0991E-14

-5.8017E-16

4.4504E-18

-2.0532E-20

4.2791E-23

TABLE 2

Fig. 3 shows an axial chromatic aberration curve of the optical imaging lens of example one in the a state, which indicates that light rays of different wavelengths deviate from the convergent focus after passing through the optical imaging lens. Fig. 4 shows astigmatism curves of the optical imaging lens of example one in the a state, which represent meridional field curvature and sagittal field curvature. Fig. 5 shows distortion curves of the optical imaging lens of example one in the a state, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 3 to 5, the optical imaging lens 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 lens of example one, which indicates that light rays of different wavelengths are deviated from a converging focus after passing through the optical imaging lens. Fig. 7 shows an astigmatism curve in the B state of the optical imaging lens of example one, which represents meridional field curvature and sagittal field curvature. Fig. 8 shows distortion curves of the optical imaging lens of example one in the B state, which indicate distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 6 to 8, the optical imaging lens 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 lens 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 an optical imaging lens structure in the a state of example two. Fig. 10 shows a schematic structural diagram of an optical imaging lens in the B state of example two.

As shown in fig. 9 and 10, the optical imaging lens includes, in order from an object side to an image side, a stop STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, a filter E8, and an image plane S17.

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

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

Table 3 shows a basic structural parameter table of the optical imaging lens 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.4061E-04

-1.3278E-04

6.0695E-05

-2.5001E-05

6.9356E-06

-1.3248E-06

1.5017E-07

S2

-9.7847E-04

3.2863E-03

-2.1842E-03

9.0293E-04

-2.4964E-04

4.5221E-05

-5.1540E-06

S3

-1.2009E-02

5.9757E-03

-5.3186E-04

-2.4624E-03

2.7530E-03

-1.7016E-03

7.1008E-04

S4

-1.1992E-02

1.7556E-03

3.4160E-03

-5.9980E-03

6.0952E-03

-4.4425E-03

2.4237E-03

S5

-1.7293E-03

1.0212E-04

-3.2803E-03

6.6056E-03

-7.8380E-03

6.2012E-03

-3.4253E-03

S6

-2.4089E-02

2.8422E-02

-3.8212E-02

4.1039E-02

-3.2628E-02

1.9071E-02

-8.2345E-03

S7

-2.7042E-02

2.2887E-02

-3.0650E-02

3.2052E-02

-2.4470E-02

1.3698E-02

-5.6656E-03

S8

-7.4184E-03

7.1619E-04

-1.8096E-03

1.8388E-03

-1.1529E-03

5.1707E-04

-1.7216E-04

S9

-8.0433E-03

8.2817E-03

-6.5264E-03

3.9645E-03

-1.8644E-03

6.7287E-04

-1.8378E-04

S10

-3.6078E-02

1.4084E-02

-4.6208E-03

3.9716E-04

5.3123E-04

-3.4211E-04

1.1430E-04

S11

-3.1530E-02

9.0171E-03

-2.8593E-03

7.1682E-04

-1.7819E-04

4.9262E-05

-1.2783E-05

S12

-3.5611E-03

-8.1108E-04

1.0995E-03

-6.1936E-04

1.9929E-04

-4.0820E-05

5.3209E-06

S13

-2.6292E-02

1.7454E-03

-8.4316E-05

2.0047E-05

-4.8468E-06

6.6910E-07

-5.8297E-08

S14

-2.6490E-02

2.3631E-03

-1.0644E-04

-6.5901E-06

1.6634E-06

-1.5610E-07

9.1733E-09

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-9.5118E-09

2.4357E-10

0.0000E+00

S2

3.3465E-07

-9.4403E-09

0.0000E+00

S3

-2.1108E-04

4.5400E-05

-7.0357E-06

7.6843E-07

-5.6347E-08

2.5014E-09

-5.1066E-11

S4

-9.9406E-04

3.0323E-04

-6.7338E-05

1.0518E-05

-1.0907E-06

6.7199E-08

-1.8574E-09

S5

1.3479E-03

-3.7985E-04

7.6045E-05

-1.0555E-05

9.6544E-07

-5.2333E-08

1.2737E-09

S6

2.6302E-03

-6.1809E-04

1.0525E-04

-1.2608E-05

1.0058E-06

-4.7901E-08

1.0290E-09

S7

1.7353E-03

-3.9152E-04

6.4098E-05

-7.3935E-06

5.6887E-07

-2.6175E-08

5.4423E-10

S8

4.2869E-05

-7.9253E-06

1.0679E-06

-1.0155E-07

6.4423E-09

-2.4437E-10

4.1916E-12

S9

3.7736E-05

-5.7737E-06

6.4653E-07

-5.1308E-08

2.7258E-09

-8.6768E-11

1.2492E-12

S10

-2.4994E-05

3.7807E-06

-3.9929E-07

2.8923E-08

-1.3683E-09

3.7999E-11

-4.6850E-13

S11

2.5700E-06

-3.7098E-07

3.7514E-08

-2.5992E-09

1.1793E-10

-3.1639E-12

3.8070E-14

S12

-3.9735E-07

7.7819E-09

1.5274E-09

-1.6792E-10

8.1296E-12

-2.0140E-13

2.0710E-15

S13

3.4156E-09

-1.3845E-10

3.9020E-12

-7.5214E-14

9.4695E-16

-7.0240E-18

2.3297E-20

S14

-3.7052E-10

1.0551E-11

-2.1152E-13

2.9186E-15

-2.6355E-17

1.4000E-19

-3.3116E-22

TABLE 4

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

As can be seen from fig. 11 to 13, the optical imaging lens according to 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 lens of example two, which indicates that the converging focal points of light rays of different wavelengths after passing through the optical imaging lens deviate. Fig. 15 shows astigmatism curves of the optical imaging lens of example two in the B state, which represent meridional field curvature and sagittal field curvature. Fig. 16 shows distortion curves of the optical imaging lens of example two in the B state, which indicate distortion magnitude values corresponding to different angles of view.

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

Example III

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

As shown in fig. 17 and 18, the optical imaging lens includes, in order from an object side to an image side, a stop STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, a filter E8, and an image plane S17.

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

In this example, the total effective focal length F of the optical imaging lens is 8.95mm, the total length TTL of the optical imaging lens is 11.60mm, the image height ImgH is 8.36mm, the F-number FnoA of the optical imaging lens in the a state is 1.66, the F-number FnoB of the optical imaging lens in the B state is 4.01, the distance D1A between the stop STO and the object-side surface S1 of the first lens in the a state of the optical imaging lens is-0.43 mm, and the distance D1B between the stop STO and the object-side surface S1 of the first lens in the B state of the optical imaging lens is 0.08 mm.

Table 5 shows a basic structural parameter table of the optical imaging lens 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.

TABLE 6

Fig. 19 shows an on-axis chromatic aberration curve in the a state of the optical imaging lens of example three, which indicates that light rays of different wavelengths are deviated from the convergent focus after passing through the optical imaging lens. Fig. 20 shows astigmatism curves of the optical imaging lens of example three in the a state, which represent meridional field curvature and sagittal field curvature. Fig. 21 shows distortion curves in the a state of the optical imaging lens 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 lens according to the third example 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 lens of example three, which indicates that light rays of different wavelengths are deviated from the convergent focus after passing through the optical imaging lens. Fig. 23 shows an astigmatism curve in the B state of the optical imaging lens of example three, which represents meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves in the B state of the optical imaging lens 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 lens according to the third example can achieve good imaging quality in the B state.

Example four

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

As shown in fig. 25 and 26, the optical imaging lens includes, in order from an object side to an image side, a stop STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, a filter E8, and an image plane S17.

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

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

Table 7 shows a basic structural parameter table of the optical imaging lens 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.

TABLE 8

Fig. 27 shows an on-axis chromatic aberration curve in the a state of the optical imaging lens of example four, which indicates that light rays of different wavelengths are deviated from the convergent focus after passing through the optical imaging lens. Fig. 28 shows an astigmatism curve in the a state of the optical imaging lens of example four, which represents meridional field curvature and sagittal field curvature. Fig. 29 shows distortion curves in the a state of the optical imaging lens of example four, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 27 to 29, the optical imaging lens 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 lens of example four, which indicates that light rays of different wavelengths are deviated from the convergent focus after passing through the optical imaging lens. Fig. 31 shows astigmatism curves of the optical imaging lens of example four in the B state, which represent meridional field curvature and sagittal field curvature. Fig. 32 shows distortion curves in the B state of the optical imaging lens 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 lens 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 lens of example five of the present application is described. Fig. 33 shows a schematic diagram of an optical imaging lens structure in the a state of example five. Fig. 34 shows a schematic configuration diagram of an optical imaging lens in the B state of example five.

As shown in fig. 33 and 34, the optical imaging lens includes, in order from an object side to an image side, a stop STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, a filter E8, and an image plane S17.

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

In this example, the total effective focal length F of the optical imaging lens is 9.05mm, the total length TTL of the optical imaging lens is 11.67mm, the image height ImgH is 8.37mm, the F-number FnoA of the optical imaging lens in the a state is 1.66, the F-number FnoB of the optical imaging lens in the B state is 4.00, the distance D1A between the stop STO and the object-side surface S1 of the first lens in the a state of the optical imaging lens is-0.43 mm, and the distance D1B between the stop STO and the object-side surface S1 of the first lens in the B state of the optical imaging lens is 0.08 mm.

Table 9 shows a basic structural parameter table of the optical imaging lens 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.0186E-04

-1.2329E-04

2.4003E-05

-2.8949E-06

-6.9075E-08

-1.5902E-08

3.1813E-09

S2

-1.2900E-03

3.3476E-03

-2.1980E-03

9.0602E-04

-2.4874E-04

4.4390E-05

-4.9419E-06

S3

-1.2043E-02

5.9949E-03

-1.2252E-03

-7.4645E-04

5.1683E-04

1.4116E-04

-3.1233E-04

S4

-1.1299E-02

-6.4227E-04

9.3289E-03

-1.5639E-02

1.6589E-02

-1.2332E-02

6.6195E-03

S5

-1.7644E-03

-1.6036E-04

1.8636E-04

-2.0506E-03

3.7736E-03

-3.6889E-03

2.2913E-03

S6

-2.1549E-02

1.4413E-02

2.0809E-04

-1.7336E-02

2.3155E-02

-1.6944E-02

8.1269E-03

S7

-2.4971E-02

1.3761E-02

-6.4747E-03

-3.2405E-03

7.7508E-03

-6.1322E-03

2.9198E-03

S8

-7.1325E-03

6.2567E-04

-1.4624E-03

1.4618E-03

-1.0507E-03

5.9966E-04

-2.5632E-04

S9

-9.8409E-03

1.1931E-02

-1.1227E-02

7.8723E-03

-4.1377E-03

1.6211E-03

-4.6938E-04

S10

-3.8322E-02

1.8952E-02

-9.0826E-03

3.1141E-03

-6.8015E-04

6.2102E-05

1.3281E-05

S11

-3.5380E-02

1.2816E-02

-4.8190E-03

1.3503E-03

-2.8831E-04

4.5905E-05

-5.2783E-06

S12

-8.0361E-03

2.1827E-03

-4.8560E-04

7.6992E-05

-3.1899E-05

1.4136E-05

-3.9136E-06

S13

-3.3611E-02

2.8056E-03

9.9886E-05

-7.5733E-05

1.2859E-05

-1.2934E-06

8.7917E-08

S14

-3.9164E-02

5.7515E-03

-6.8638E-04

6.3324E-05

-4.5221E-06

2.5153E-07

-1.0880E-08

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.0529E-10

-7.3588E-12

0.0000E+00

S2

3.1139E-07

-8.4885E-09

0.0000E+00

S3

1.8248E-04

-6.1010E-05

1.3115E-05

-1.8491E-06

1.6586E-07

-8.6023E-09

1.9662E-10

S4

-2.5917E-03

7.3943E-04

-1.5185E-04

2.1838E-05

-2.0853E-06

1.1869E-07

-3.0453E-09

S5

-9.6474E-04

2.8225E-04

-5.7446E-05

7.9715E-06

-7.1787E-07

3.7715E-08

-8.7401E-10

S6

-2.7103E-03

6.4215E-04

-1.0805E-04

1.2648E-05

-9.8072E-07

4.5339E-08

-9.4694E-10

S7

-9.3784E-04

2.1097E-04

-3.3432E-05

3.6652E-06

-2.6498E-07

1.1375E-08

-2.1980E-10

S8

7.8924E-05

-1.7255E-05

2.6483E-06

-2.7887E-07

1.9195E-08

-7.7823E-10

1.4101E-11

S9

1.0001E-04

-1.5580E-05

1.7493E-06

-1.3763E-07

7.1938E-09

-2.2427E-10

3.1547E-12

S10

-6.1728E-06

1.1895E-06

-1.4010E-07

1.0656E-08

-5.1049E-10

1.3968E-11

-1.6537E-13

S11

4.1661E-07

-2.0655E-08

6.1267E-10

-3.0096E-11

3.2955E-12

-1.8438E-13

3.6971E-15

S12

6.9850E-07

-8.3634E-08

6.8012E-09

-3.7088E-10

1.2981E-11

-2.6343E-13

2.3553E-15

S13

-4.2311E-09

1.4653E-10

-3.6395E-12

6.3383E-14

-7.3562E-16

5.1131E-18

-1.6106E-20

S14

3.6246E-10

-9.1464E-12

1.7058E-13

-2.2655E-15

2.0165E-17

-1.0732E-19

2.5709E-22

Watch 10

Fig. 35 shows an on-axis chromatic aberration curve in the a state of the optical imaging lens of example five, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 36 shows astigmatism curves in the a state of the optical imaging lens 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 lens 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 lens according to 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 lens of example five, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 39 shows astigmatism curves in the B state of the optical imaging lens 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 lens 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 lens 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 formula/example	1	2	3	4	5
						f*EPDA/EPDB(mm)	21.43	22.05	21.62	21.50	21.80
f*tan(HFOV)(mm)	8.15	7.96	7.99	7.02	8.16
						(EPDA-EPDB)(mm)	3.13	3.31	3.16	3.14	3.19
(R2-R1)/f1	2.15	2.52	2.56	4.39	2.65
						(f3-f2)/(f3+f2)	6.24	4.42	2.19	2.36	4.26
(R6-R5)/(R3+R4)	1.45	1.14	0.86	1.36	1.20
						f5/R9	3.16	1.85	1.78	2.35	1.75
f6/R11	1.51	1.53	1.59	2.87	1.57
						f12/(CT1+CT2+T23)	6.50	6.11	6.18	5.61	6.13
f34/f56	2.25	2.58	2.32	0.68	2.45
						f123456/(T67+CT7)	2.57	2.57	2.60	3.34	2.59
(SAG61+SAG62)/(SAG51+SAG52)	1.33	1.43	1.42	0.51	1.52
						(ET2+ET3+ET4)/ET7	1.05	1.08	1.06	2.92	1.19

TABLE 11

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

Example parameters	1	2	3	4	5
						f1(mm)	7.85	7.77	7.71	7.01	7.76
f2(mm)	-14.39	-14.39	-14.20	-11.35	-14.32
						f3(mm)	19.89	22.81	38.06	28.00	23.12
f4(mm)	-46.16	-53.01	4008520.79	-1169.12	-54.57
						f5(mm)	-19.35	-13.28	-13.16	-10.08	-13.35
f6(mm)	9.23	7.67	7.84	8.83	7.88
						f7(mm)	-12.28	-13.92	-13.18	8127.44	-12.59
f(mm)	8.89	8.82	8.95	8.92	9.05
						TTL(mm)	11.56	11.52	11.60	11.72	11.67
ImgH(mm)	8.36	8.36	8.36	8.36	8.37
						FnoA	1.66	1.60	1.66	1.66	1.66
FnoB	4.00	4.00	4.01	4.00	4.00
						D1A(mm)	-0.43	-0.43	-0.43	-0.43	-0.43
D1B(mm)	0.08	0.08	0.08	0.08	0.08

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 lens described above.

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

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

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

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

Claims

1. An optical imaging lens, comprising:

a diaphragm, the diaphragm being movable;

a first lens having a positive optical power;

the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

the third lens has positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;

the fourth lens has focal power, the object-side surface of the fourth lens is a convex surface, and the image-side surface of the fourth lens is a concave surface;

a fifth lens having a negative optical power;

a sixth lens having a positive focal power, an object side surface of the sixth lens being a convex surface;

a seventh lens having an optical power;

wherein the effective focal length f of the optical imaging lens, the entrance pupil diameter EPDA of the optical imaging lens in the A state and the entrance pupil diameter EPDB of the optical imaging lens in the B state satisfy: 20mm < f EPDA/EPDB <25 mm.

2. The optical imaging lens according to claim 1, wherein an effective focal length f of the optical imaging lens and a half field angle HFOV of the optical imaging lens satisfy: 6.8mm < f tan (HFOV) <8.6 mm.

3. The optical imaging lens of claim 1, wherein the entrance pupil diameter EPDA of the optical imaging lens in a state and the entrance pupil diameter EPDB of the optical imaging lens in B state satisfy: 2.8mm < (EPDA-EPDB) <3.8 mm.

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

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

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

7. The optical imaging lens of claim 1, wherein an effective focal length f5 of the fifth lens and a radius of curvature R9 of an object side of the fifth lens satisfy: 1.5< f5/R9< 3.3.

8. The optical imaging lens of claim 1, wherein an effective focal length f6 of the sixth lens and a radius of curvature R11 of an object side of the sixth lens satisfy: 1.3< f6/R11< 3.0.

9. The optical imaging lens of claim 1, wherein a composite focal length f12 of the first and second lenses, a center thickness CT1 of the first lens on an optical axis of the optical imaging lens, a center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and an air space T23 of the second and third lenses on the optical axis of the optical imaging lens satisfy: 5.5< f12/(CT1+ CT2+ T23) < 6.7.

10. An optical imaging lens, comprising:

a diaphragm, the diaphragm being movable;

a first lens having a positive optical power;

a fifth lens having a negative optical power;

a seventh lens having an optical power;

wherein the effective focal length f of the optical imaging lens and the half field angle HFOV of the optical imaging lens satisfy: 6.8mm < f tan (HFOV) <8.6 mm.