CN114815168B

CN114815168B - Optical imaging lens

Info

Publication number: CN114815168B
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: 2024-04-19
Anticipated expiration: 2042-05-27
Also published as: CN114815168A

Abstract

The present invention provides an optical imaging lens comprising: a diaphragm, the diaphragm being movable; the first lens has 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 optical 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 optical power; the effective focal length f of the optical imaging lens, the entrance pupil diameter EPDA of the optical imaging lens in the state a, and the entrance pupil diameter EPDB of the optical imaging lens in the state B satisfy: 20mm < f < EPDA/EPDB <25mm. The invention solves the problem of poor imaging quality of the optical imaging lens in the prior art under the complex light environment.

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, mobile phone lenses with high imaging quality are increasingly favored. The mobile phone in the market is developed towards the direction of light weight and thinning, the size of the mobile phone lens is required to be smaller and smaller, but the difficulty of obtaining high-quality images of the mobile phone lens in a complex light environment is increased due to the limitation of a narrow space of the mobile phone.

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

Disclosure of Invention

The invention mainly aims to provide an optical imaging lens to solve the problem that the imaging quality of the optical imaging lens in the prior art is poor 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: a diaphragm, the diaphragm being movable; a first lens having positive optical power; the second lens is provided with 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 is provided with 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 is provided with 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 negative optical power; 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 state a, and the entrance pupil diameter EPDB of the optical imaging lens in the state B satisfy: 20mm < f < EPDA/EPDB <25mm.

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) <8.6mm.

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) <3.8mm.

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)/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: 2.0< (f3-f2)/(f3+f2) <6.4.

Further, 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.

Further, 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.

Further, 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.

Further, 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< f 12/(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, 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< f 123456/(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 an 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< (ET 2+ ET3+ ET 4)/ET 7<3.1.

According to another aspect of the present invention, there is provided an optical imaging lens including: a diaphragm, the diaphragm being movable; a first lens having positive optical power; the second lens is provided with 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 is provided with 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 is provided with 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 negative optical power; 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 satisfy the following conditions: 6.8mm < f tan (HFOV) <8.6mm.

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

The optical power of each lens is reasonably distributed, so that the aberration generated by the optical imaging lens is balanced, meanwhile, the larger deflection of the optical path can be avoided, and the imaging quality of the optical imaging lens is greatly improved. The first lens, the third lens and the sixth lens have positive focal power, light rays can be effectively converged, the second lens and the fifth lens have negative focal power, the positive and negative focal power are distributed in a staggered mode, and the phenomenon that the shapes of the local lenses are abnormal due to the fact that the focal power is too concentrated is avoided, and the processing is difficult. By limiting F EPDA/EPDB within a reasonable range, the size of the entrance pupil diameter is reasonably controlled, the state range of the variable aperture is widely covered, the maximum aperture can reach F#1.6, the minimum aperture can reach F#4.0 and above, and the seamless connection from extremely dark to extremely bright environments is realized, so that the optical imaging lens has enough luminous flux and radiant illuminance, the optical imaging lens is ensured to meet the requirement of clear imaging in different light environments, and the effect that the optical imaging lens can clearly image in complex light environments is effectively realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a schematic view showing an example of the present invention, namely, an optical imaging lens in the A state;

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

Fig. 3 to 5 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging lens in fig. 1;

fig. 6 to 8 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging lens in fig. 2;

Fig. 9 is a schematic diagram showing the structure of an optical imaging lens in a state a according to an example two of the present invention;

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

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

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

Fig. 17 is a schematic diagram showing the structure of an optical imaging lens in an a state in example three of the present invention;

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

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

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

fig. 25 is a schematic view showing the structure of an optical imaging lens in an a state in example four of the present invention;

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

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

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

Fig. 33 is a schematic view showing the structure of an optical imaging lens in an a state in example five of the present invention;

Fig. 34 is a schematic view showing the structure of an optical imaging lens in a B state in example five of the present invention;

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

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

Wherein the above figures include the following reference numerals:

STO and diaphragm; e1, a first lens; s1, an object side surface of a first lens; s2, an image side surface of the first lens; e2, a second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, a third lens; s5, the object side surface of the third lens is provided; s6, an image side surface of the third lens; e4, a fourth lens; s7, an object side surface of the fourth lens; s8, an image side surface of the fourth lens is provided; e5, a fifth lens; s9, an object side surface of the fifth lens; s10, an image side surface of the fifth lens; e6, a sixth lens; s11, an object side surface of the sixth lens; s12, an image side surface of the sixth lens; e7, seventh lens; s13, an object side surface of the seventh lens; s14, an image side surface of the seventh lens; e8, a filter; s15, the object side surface of the filter; s16, an image side surface of the filter; s17, an imaging surface.

Detailed Description

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

It is noted that 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 unless otherwise indicated.

In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.

It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, 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 convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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 concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the object side becomes the object side of the lens, and the surface of each lens near the image side is called the image side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In 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 image side, the concave surface is determined when the R value is positive, and the convex surface is determined 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 largest entrance pupil diameter that the optical imaging lens can adjust, and EPDB represents the smallest entrance pupil diameter that the optical imaging lens can adjust.

In order to solve the problem that an optical imaging lens in the prior art has poor imaging quality in a complex light environment, the invention mainly provides the optical imaging lens.

Example 1

As shown in fig. 1 to 40, the optical imaging lens includes a stop, 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 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 optical 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 optical power; the effective focal length f of the optical imaging lens, the entrance pupil diameter EPDA of the optical imaging lens in the state a, and the entrance pupil diameter EPDB of the optical imaging lens in the state B satisfy: 20mm < f < EPDA/EPDB <25mm.

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 <23mm.

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) <8.6mm. 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 can form a clear image within a large image plane range. Preferably 7.0mm < f tan (HFOV) <8.2mm.

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) <3.8mm. The (EPDA-EPDB) is limited in a reasonable range, so that the effective focal length of the optical imaging lens is restrained, the luminous flux of the optical imaging lens is ensured to be in a proper range, the function of an iris diaphragm is realized, and the imaging quality of the optical imaging lens is ensured. Preferably 3.1mm < (EPDA-EPDB) <3.4mm.

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)/f 1<4.5. By limiting (R2-R1)/f 1 to 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 plane type sensitivity of the first lens is reduced, 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 focal power of the first lens and controlling the deflection trend of light rays, and meanwhile, the aberration of the first lens can be corrected. On the existing process 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)/f 1<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 (f 3-f 2)/(f3+f2) to 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 lens can be reduced, and the imaging quality of the optical imaging lens can be 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. By limiting (R6-R5)/(R3+R4) within a reasonable range, the focal power of the second lens and the third lens can be effectively adjusted, the processing difficulty caused by overlarge opening angle can be avoided, the limitation of strict tolerance and process level is avoided, the coma aberration, the field curvature and the like of the optical imaging lens are effectively buffered, and the spherical aberration and the field curvature of the optical imaging lens are effectively balanced. 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 controlled, and meanwhile, the aberration of the fifth lens can be effectively controlled. On the existing process 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 controlled, and meanwhile, the aberration correction of the sixth lens can be effectively controlled. On the existing process 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< f 12/(CT1+CT2+T23) <6.7. Through limiting f 12/(CT1+CT2+T23) in a reasonable range, the thicknesses of the first lens and the second lens are reasonably distributed, the lens processing and assembly are facilitated, the ghost image risk and the sensitivity degree of the lens can be effectively reduced, the assembly process is satisfied 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 fit between the second lens and the third lens are greatly assisted in improving field curvature, and the imaging quality of the optical imaging lens is ensured. Preferably, 5.6< f 12/(CT 1+ 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 to a reasonable range, the sensitivity of the third lens, the fourth lens, the fifth lens and the sixth lens is reduced, and the requirement of too tight tolerance is avoided. Meanwhile, the deflection angle of light 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< f 123456/(t67+ct7) <3.6. Through limiting f 123456/(T67+CT7) in a reasonable range, the thickness of the seventh lens is reasonably distributed, processing and assembly of the lens are facilitated, ghost image risks and sensitivity of the lens can be effectively reduced, field curvature balance of the optical imaging lens can be effectively controlled, and the optical imaging lens has reasonable field curvature. Preferably, 2.5< f 123456/(t67+ct7) <3.4.

In the present embodiment, 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 an 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. Through controlling (SAG61+SAG62)/(SAG51+SAG52) in a reasonable range, the problem of overlarge curvature gap 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 out by limiting the vector ratio, the imaging quality of the optical imaging lens is improved, the structural sensitivity and the molding demolding of the fifth lens and the sixth lens are reduced in engineering, and the actual processing assembly is facilitated. In addition, the method is beneficial to weakening total reflection of the lens and improving performance. Preferably, 0.5< (SAG61+SAG62)/(SAG51+SAG52) <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 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 molding, demolding and processing assembly are facilitated, and the imaging quality of the optical imaging lens 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 lens includes a stop, 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 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 optical 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 optical power; the effective focal length f of the optical imaging lens and the half field angle HFOV of the optical imaging lens satisfy the following conditions: 6.8mm < f tan (HFOV) <8.6mm.

The optical power of each lens is reasonably distributed, so that the aberration generated by the optical imaging lens is balanced, meanwhile, the larger deflection of the optical path can be avoided, and the imaging quality of the optical imaging lens is greatly improved. The first lens, the third lens and the sixth lens have positive focal power, light rays can be effectively converged, the second lens and the fifth lens have negative focal power, the positive and negative focal power are distributed in a staggered mode, and the phenomenon that the shapes of the local lenses are abnormal due to the fact that the focal power is too concentrated is avoided, and the processing is difficult. 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 can 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) <8.2mm.

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 existing process 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 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 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 molding and demolding processing assembly is facilitated, and the imaging quality of the optical imaging lens is ensured. Preferably, 1.0< (ET 2+ ET3+ ET 4)/ET 7<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 located on the imaging surface.

The optical imaging lens in the present application may employ a plurality of lenses, for example, seven lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of each lens, the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the processability 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 and the like. The optical imaging lens also has the advantages of variable aperture, large image surface, telescopic optical lens and the like, can realize aperture multi-gear change 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 aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the technical solution claimed in the present application. For example, although seven lenses are described as an example 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, if desired.

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

It should be noted that any 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 according to an example one of the present application is described. Fig. 1 shows a schematic diagram of an example-optical imaging lens configuration in the a state. Fig. 2 shows a schematic configuration of an optical imaging lens in a B state as an example.

As shown in fig. 1 and 2, the optical imaging lens 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 imaging surface S17.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is concave, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 of the seventh lens element is convex, and an image-side surface S14 of the seventh lens element is concave. The filter E8 has an object side S15 of the filter and an image side S16 of the filter. 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 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 0.08mm.

Table 1 shows a basic structural parameter table of an optical imaging lens of example one, in which the units of radius of curvature, thickness/distance, and 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 to the seventh lens element E7 are aspheric, and the surface shape of each aspheric lens element can be defined by, but not limited to, the following aspheric formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 aspherical i-th order. The following Table 2 shows the higher order coefficients 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.

Face number

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

Face number

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 on-axis chromatic aberration curve of the optical imaging lens of example one in the a state, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 4 shows an astigmatism curve of the optical imaging lens of example one in the a state, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 5 shows a distortion curve of the optical imaging lens of example one in the a state, which represents distortion magnitude values corresponding to different angles of view.

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

Fig. 6 shows an on-axis chromatic aberration curve of the optical imaging lens of example one in the B state, which indicates the convergence focus deviation of light rays of different wavelengths 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 indicates meridional image plane curvature and sagittal image plane curvature. Fig. 8 shows a distortion curve of the optical imaging lens of example one in the B state, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 6 to 8, the optical imaging lens provided in example one 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, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 9 is a schematic diagram showing an optical imaging lens configuration in the a state of example two. Fig. 10 shows a schematic structural diagram of an optical imaging lens in a B state of example two.

As shown in fig. 9 and 10, the optical imaging lens includes, in order from the object side to the 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 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 0.08mm.

Table 3 shows a basic structural parameter table of an optical imaging lens of example two, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 3 Table 3

Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example two, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

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

Face number

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 Table 4

Fig. 11 shows an on-axis chromatic aberration curve of the optical imaging lens of example two in the a state, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 12 shows an astigmatism curve of the optical imaging lens of example two in the a state, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 13 shows a distortion curve of the optical imaging lens of example two in the a state, which represents distortion magnitude values corresponding to different angles of view.

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

Fig. 14 shows an on-axis chromatic aberration curve of the optical imaging lens of example two in the B state, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 15 shows an astigmatism curve in the B state of the optical imaging lens of example two, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 16 shows a distortion curve of the optical imaging lens of example two in the B state, which represents distortion magnitude values corresponding to different angles of view.

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

Example three

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 an a state of example three. Fig. 18 shows a schematic configuration diagram of an optical imaging lens in the B state of example three.

As shown in fig. 17 and 18, the optical imaging lens includes, in order from the object side to the 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 imaging surface S17.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is concave, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 of the seventh lens element is convex, and an image-side surface S14 of the seventh lens element is concave. The filter E8 has an object side S15 of the filter and an image side S16 of the filter. 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 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 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 is 0.08mm.

Table 5 shows a basic structural parameter table of an optical imaging lens of example three, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 5

Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example three, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

TABLE 6

Fig. 19 shows an on-axis chromatic aberration curve of the optical imaging lens of example three in the a state, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 20 shows an astigmatism curve in the a state of the optical imaging lens of example three, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 21 shows a distortion curve of the optical imaging lens of example three in the a state, which represents distortion magnitude values corresponding to different angles of view.

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

Fig. 22 shows an on-axis chromatic aberration curve of the optical imaging lens of example three in the B state, which indicates a convergent focus deviation of light rays of different wavelengths 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 image plane curvature and sagittal image plane curvature. Fig. 24 shows a distortion curve of the optical imaging lens of example three in the B state, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 22 to 24, the optical imaging lens given in example three 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 of an optical imaging lens in the B state of example four.

As shown in fig. 25 and 26, the optical imaging lens includes, in order from the object side to the 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 imaging surface S17.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is concave, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 of the seventh lens element is convex, and an image-side surface S14 of the seventh lens element is concave. The filter E8 has an object side S15 of the filter and an image side S16 of the filter. 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 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 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 is 0.08mm.

Table 7 shows a basic structural parameter table of an optical imaging lens of example four, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 7

Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example four, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

TABLE 8

Fig. 27 shows an on-axis chromatic aberration curve of the optical imaging lens of example four in the a state, which indicates a convergent focus deviation of light rays of different wavelengths 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 indicates meridional image plane curvature and sagittal image plane curvature. Fig. 29 shows a distortion curve of the optical imaging lens of example four in the a state, which represents 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 of the optical imaging lens of example four in the B state, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 31 shows an astigmatism curve in the B state of the optical imaging lens of example four, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 32 shows a distortion curve of the optical imaging lens of example four in the B state, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 30 to 32, the optical imaging lens given in 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 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 the object side to the 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 imaging surface S17.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is concave, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 of the seventh lens element is convex, and an image-side surface S14 of the seventh lens element is concave. The filter E8 has an object side S15 of the filter and an image side S16 of the filter. 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 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 0.08mm.

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

TABLE 9

Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example five, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

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

Face number

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

Table 10

Fig. 35 shows an on-axis chromatic aberration curve of the optical imaging lens of example five in the a state, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 36 shows an astigmatism curve in the a state of the optical imaging lens of example five, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 37 shows a distortion curve of the optical imaging lens of example five in the a state, which represents distortion magnitude values corresponding to different angles of view.

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

Fig. 38 shows an on-axis chromatic aberration curve of the optical imaging lens of example five in the B state, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 39 shows an astigmatism curve in the B state of the optical imaging lens of example five, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 40 shows a distortion curve of the optical imaging lens of example five in the B state, which represents distortion magnitude values corresponding to different angles of view.

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

In summary, examples one to five satisfy the relationships shown in table 11, respectively.

Condition/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 the effective focal lengths f of the optical imaging lenses of examples one to five, the 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 application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the optical imaging lens described above.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the 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 exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated 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 the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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;

The lens comprises a first lens, a second lens and a third lens, wherein the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

The second lens is provided with 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 is provided with 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 is provided with 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 with negative focal power, wherein the object side surface of the fifth lens is a concave surface;

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

a seventh lens having optical power, wherein an object side surface of the seventh lens is a convex surface, and an image side surface of the seventh lens is a concave surface;

wherein, 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 conditions: 0.5< f34/f56<2.9;

The effective focal length f of the optical imaging lens, the entrance pupil diameter EPDA of the optical imaging lens in the state a, and the entrance pupil diameter EPDB of the optical imaging lens in the state B satisfy: 20mm < f < epda/EPDB <25mm;

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 meet the following conditions: 2.8mm < (EPDA-EPDB) <3.8mm;

The A state refers to a state when the entrance pupil diameter of the optical imaging lens is maximum, and the B state refers to a state when the entrance pupil diameter of the optical imaging lens is minimum.

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

3. 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.

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

5. 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 surface of the fifth lens satisfy: 1.5< f5/R9<3.3.

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

7. The optical imaging lens according to claim 1, wherein a combined focal length f12 of the first lens and the second lens, 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 interval T23 of the second lens and the third lens on the optical axis of the optical imaging lens satisfy: 5.5< f 12/(CT1+CT2+T23) <6.7.

8. The optical imaging lens of claim 1, wherein a combined 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 an 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 between: 2.2< f 123456/(t67+ct7) <3.6.

9. The optical imaging lens according to claim 1, wherein 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.

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

11. An optical imaging lens, comprising:

A diaphragm, the diaphragm being movable;

The effective focal length f of the optical imaging lens and the half field angle HFOV of the optical imaging lens satisfy the following conditions: 6.8mm < f tan (HFOV) <8.6mm;

12. The optical imaging lens of claim 11, wherein a radius of curvature R1 of an object side surface of the first lens, a radius of curvature R2 of an image side surface of the first lens, and an effective focal length f1 of the first lens satisfy: 2.0< (R2-R1)/f 1<4.5.

13. The optical imaging lens of claim 11, 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.

14. The optical imaging lens of claim 11, wherein a radius of curvature R3 of an object-side surface of the second lens, a radius of curvature R4 of an image-side surface of the second lens, a radius of curvature R5 of an object-side surface of the third lens, and a radius of curvature R6 of an image-side surface of the third lens satisfy: 0.6< (R6-R5)/(R3+R4) <1.6.

15. The optical imaging lens of claim 11, wherein an effective focal length f5 of the fifth lens and a radius of curvature R9 of an object side surface of the fifth lens satisfy: 1.5< f5/R9<3.3.

16. The optical imaging lens of claim 11, wherein an effective focal length f6 of the sixth lens and a radius of curvature R11 of an object side surface of the sixth lens satisfy: 1.3< f6/R11<3.0.

17. The optical imaging lens according to claim 11, wherein a combined focal length f12 of the first lens and the second lens, 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 interval T23 of the second lens and the third lens on the optical axis of the optical imaging lens satisfy: 5.5< f 12/(CT1+CT2+T23) <6.7.

18. The optical imaging lens of claim 11, wherein a combined 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 an 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 between: 2.2< f 123456/(t67+ct7) <3.6.

19. The optical imaging lens according to claim 11, wherein an on-axis distance SAG61 between an intersection 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 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 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 of the image side surface of the fifth lens and an 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.

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