CN217902163U

CN217902163U - Optical lens group

Info

Publication number: CN217902163U
Application number: CN202222193389.9U
Authority: CN
Inventors: 张晓彤; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2022-11-25
Anticipated expiration: 2032-08-19

Abstract

The utility model provides an optical lens group includes in order along object side to image side of optical lens group: a first lens; a second lens; a third lens element with negative refractive power; a fourth lens element with negative refractive power; a fifth lens; a sixth lens, a surface of the sixth lens facing the object side being concave, a surface of the sixth lens facing the image side being concave; wherein, the aperture value Fno of the optical lens group satisfies: fno <1.7; half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical lens group, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the following conditions: -9< (f 2+ f 3)/ImgH < -7. The utility model provides an among the prior art poor problem of formation of image quality under the dark environment of optics lens group.

Description

Optical lens group

Technical Field

The utility model relates to an optical imaging equipment technical field particularly, relates to an optics lens group.

Background

In the current mobile phone market, the photographing function is more and more emphasized, the functions of a night scene mode, a high-speed shutter and the like are more and more frequently applied, people have stronger and stronger requirements for photographing high-quality pictures, and the development of an optical lens group of a mobile phone towards the directions of large aperture, large aperture and large lens quantity is promoted. However, a larger number of lenses means that the risk of aberrations is higher, the offset of the optical axis is also increased, and the imaging quality of the optical lens group is greatly threatened. Meanwhile, the difficulty of the assembly process is greatly increased due to the increase of the number of the lenses, the yield of the optical lens group is reduced, the production cost is increased, and the production efficiency is influenced. Therefore, the difficulty of selecting the lens and designing the structure of the optical lens group is greatly increased.

Under the dark surrounds, the clear of formation of image is guaranteed to the light volume that optics lens group needs to be higher, and the imaging surface of optics lens group needs to obtain enough high illuminance, consequently is higher to the demand of the big light ring of large aperture. When a moving object is shot, the picture can be better solidified by utilizing the higher shutter speed of the large-aperture optical lens group. Meanwhile, in order to match with more lenses, the aberration is corrected, the optical performance of the optical lens group is improved, and how to ensure the imaging quality of the optical lens group has higher difficulty.

That is to say, the optical lens assembly in the prior art has a problem of poor imaging quality in a dark environment.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an optical lens assembly to solve the problem of poor imaging quality in the dark environment of the optical lens assembly in the prior art.

In order to achieve the above object, according to an aspect of the present invention, there is provided an optical lens group, comprising in order from an object side to an image side of the optical lens group: a first lens; a second lens; a third lens element with negative refractive power; a fourth lens element with negative refractive power; a fifth lens; a sixth lens, a surface of the sixth lens facing the object side being concave, a surface of the sixth lens facing the image side being concave; wherein, the aperture value Fno of the optical lens group satisfies: fno <1.7; half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical lens group, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens meet the following requirements: -9< (f 2+ f 3)/ImgH < -7.

Further, the maximum half field angle Semi-FOV of the optical lens group, the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical lens group, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: -18< (f 3+ f 4)/(ImgH tan (Semi-FOV)) < -12.

Further, the maximum half field angle Semi-FOV of the optical lens group, the on-axis distance SL from the diaphragm of the optical lens group to the imaging plane of the optical lens group, and the entrance pupil diameter EPD of the optical lens group satisfy: 1.5 sL/EPD tan (Semi-FOV) <1.8.

Further, an on-axis distance TTL from the object-side-facing surface of the first lens element to the image plane of the optical lens group, an aperture value Fno of the optical lens group, and an on-axis distance BFL from the image-side-facing surface of the sixth lens element to the image plane of the optical lens group satisfy: 3-and-are TTL/BFL/Fno <4.

Further, the radius of curvature R1 of the surface of the first lens facing the object side and the radius of curvature R2 of the surface of the first lens facing the image side satisfy: 1< (R1 + R2)/(R2-R1) <2.

Furthermore, the curvature radius R1 of the surface of the first lens facing the object side, the curvature radius R2 of the surface of the first lens facing the image side and the effective focal length f1 of the first lens satisfy: 0.4 sj & lt f1/(R2-R1) <1.

Furthermore, the curvature radius R3 of the surface facing the object side of the second lens, the curvature radius R4 of the surface facing the image side of the second lens, the curvature radius R7 of the surface facing the object side of the fourth lens and the curvature radius R8 of the surface facing the image side of the fourth lens satisfy: 0.7< (R3 + R4)/(R7 + R8) <1.

Further, an axial distance TTL from the object side facing surface of the first lens element to the image forming surface of the optical lens group, an axial distance BFL from the image side facing surface of the sixth lens element to the image forming surface of the optical lens group, and an axial distance Tr9r12 from the object side facing surface of the fifth lens element to the image side facing surface of the sixth lens element satisfy: 0.45< (Tr 9r12+ BFL)/TTL <0.55.

Further, the central thickness CT1 of the first lens and the central thickness CT5 of the fifth lens satisfy: 0.8-straw CT1/CT5<1.2.

Further, the central thickness CT1 of the first lens, the central thickness CT6 of the sixth lens, the edge thickness ET1 of the first lens and the edge thickness ET6 of the sixth lens satisfy: 0.7< (ET 1/CT 1)/(CT 6/ET 6) <1.

Further, an on-axis distance TD between a surface of the first lens facing the object side and a surface of the sixth lens facing the image side, and a sum Σ ET of edge thicknesses of the first lens to the sixth lens on the optical axis of the optical lens group satisfy: 0.7< ∑ ET/TD <0.9.

Further, the central thickness CT2 of the second lens piece on the optical axis of the optical lens group, the central thickness CT3 of the third lens piece on the optical axis of the optical lens group, and the distance T23 of the air gap between the second lens piece and the third lens piece on the optical axis of the optical lens group satisfy: 1 is formed by T23/(CT 2+ CT 3) less than or equal to 1.1.

Further, an on-axis distance SAG61 from an intersection point of a surface of the sixth lens facing the object side and the optical axis of the optical lens group to an effective radius vertex of the surface of the sixth lens facing the object side, and an on-axis distance SAG62 from an intersection point of the surface of the sixth lens facing the image side and the optical axis of the optical lens group to an effective radius vertex of the surface of the sixth lens facing the image side satisfy: 1 is less than or equal to SAG61/SAG62 and less than 2.

Furthermore, four of the six lenses of the optical lens group have abbe numbers larger than 50.

Furthermore, the optical lens assembly further includes a diaphragm located at an object side of the first lens, a surface of the first lens facing the object side is convex, and the first lens is a meniscus lens; the surface of the second lens facing the object side is a convex shape, and the second lens is a meniscus lens.

According to another aspect of the present invention, there is provided an optical lens assembly, comprising in order from an object side to an image side along the optical lens assembly: a first lens; a second lens; a third lens element with negative refractive power; a fourth lens element with negative refractive power; a fifth lens; a sixth lens, a surface of the sixth lens facing the object side being concave, and a surface of the sixth lens facing the image side being concave; wherein, the aperture value Fno of the optical lens group satisfies: fno <1.7; the maximum half field angle Semi-FOV of the optical lens group, the on-axis distance SL from the diaphragm of the optical lens group to the imaging surface of the optical lens group and the entrance pupil diameter EPD of the optical lens group meet the following requirements: 1.5 sL/EPD tan (Semi-FOV) <1.8.

Furthermore, the curvature radius R1 of the surface of the first lens facing the object side, the curvature radius R2 of the surface of the first lens facing the image side and the effective focal length f1 of the first lens satisfy the following conditions: 0.4 sj & lt f1/(R2-R1) <1.

Furthermore, an axial distance TTL between a surface of the first lens element facing the object side and an imaging surface of the optical lens group, an axial distance BFL between a surface of the sixth lens element facing the image side and an imaging surface of the optical lens group, and an axial distance Tr9r12 between a surface of the fifth lens element facing the object side and a surface of the sixth lens element facing the image side satisfy: 0.45< (Tr 9r12+ BFL)/TTL <0.55.

Further, an axial distance SAG61 from an intersection point of the surface of the sixth lens facing the object side and the optical axis of the optical lens group to an effective radius vertex of the surface of the sixth lens facing the object side, and an axial distance SAG62 from an intersection point of the surface of the sixth lens facing the image side and the optical axis of the optical lens group to an effective radius vertex of the surface of the sixth lens facing the image side satisfy: 1 is less than or equal to SAG61/SAG62 and less than 2.

By applying the technical scheme of the utility model, along the object side to the image side of the optical lens group, the optical lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence; the third lens has negative refractive power; the fourth lens has negative refractive power; the surface of the sixth lens facing the object side is in a concave shape, and the surface of the sixth lens facing the image side is in a concave shape; wherein, the aperture value Fno of the optical lens group satisfies: fno <1.7; half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical lens group, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens meet the following requirements: -9< (f 2+ f 3)/ImgH < -7.

By controlling the surfaces of the sixth lens element facing the object side and the image side to be concave, the image height of the optical lens assembly on the image plane can be increased. By controlling the refractive power of the third lens and the fourth lens to be negative, the optical aberration generated by the optical lens group can be balanced, and the imaging quality of the optical lens group can be improved. The characteristic of large aperture of the optical lens group can be realized by controlling the aperture value Fno of the optical lens group to be less than 1.7. Meanwhile, the sensitivity of the second lens and the third lens can be reduced by limiting (f 2+ f 3)/ImgH within a reasonable range, so that the matching of all the lenses is facilitated, the aberration of the optical lens group is better eliminated, the imaging quality of the optical lens group is improved, and meanwhile, the optical lens group has a better processing technology. In addition, the relative illumination of the large image plane of the optical lens group can be effectively ensured, and the optical lens group has higher optical performance and ensures the imaging quality of the optical lens group.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the scope of the invention. In the drawings:

fig. 1 is a schematic structural diagram of an optical lens assembly according to a first embodiment of the present invention;

fig. 2 to 5 respectively show an axial chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve and a distortion curve of the optical lens set of fig. 1;

fig. 6 is a schematic structural view of an optical lens assembly according to a second embodiment of the present invention;

fig. 7 to 10 show an axial chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve and a distortion curve of the optical lens set of fig. 6, respectively;

fig. 11 is a schematic structural view of an optical lens assembly according to a third example of the present invention;

fig. 12 to 15 show an axial chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve and a distortion curve of the optical lens group of fig. 11, respectively;

fig. 16 is a schematic structural view of an optical lens assembly according to a fourth example of the present invention;

fig. 17 to 20 show an axial chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve and a distortion curve of the optical lens set of fig. 16;

fig. 21 is a schematic structural view of an optical lens assembly according to example five of the present invention;

fig. 22 to 25 respectively show an axial chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve and a distortion curve of the optical lens set of fig. 21;

fig. 26 is a schematic structural view of an optical lens assembly according to a sixth example of the present invention;

fig. 27 to 30 show an axial chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical lens group in fig. 26, respectively.

Wherein the figures include the following reference numerals:

STO, diaphragm; e1, a first lens; s1, the surface of the first lens, which faces the object side; s2, the surface of the first lens facing the image side; e2, a second lens; s3, the surface of the second lens facing the object side; s4, the surface of the second lens facing the image side; e3, a third lens; s5, the surface of the third lens, which faces the object side; s6, the surface of the third lens facing the image side; e4, a fourth lens; s7, the surface of the fourth lens facing the object side; s8, the surface of the fourth lens facing the image side; e5, a fifth lens; s9, the surface of the fifth lens facing the object side; s10, the surface of the fifth lens facing the image side; e6, a sixth lens; s11, the surface of the sixth lens facing the object side; s12, the surface of the sixth lens facing the image side; e7, a filter plate; s13, the surface of the filter piece facing the object side; s14, a surface of the filter plate facing the image side; and S15, imaging.

Detailed Description

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

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

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

It should be noted that in this specification, the expressions first, second, third, etc. are 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 lenses have been slightly exaggerated for the convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then it is indicated that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave locations are 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 is the surface of the lens facing to the object side, and the surface of each lens close to the image side is called the surface of the lens facing to the image side. The determination of the surface shape in the paraxial region can be performed by determining whether 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 the lens database (lens data) in the optical software) according to the determination method of a person ordinarily skilled in the art. When the value of R is positive, the surface facing the object side is determined to be convex, and when the value of R is negative, the surface is determined to be concave; on the surface facing the image side, the shape is determined to be concave when the R value is positive, and convex when the R value is negative.

In order to solve the poor problem of formation of image quality under the dark environment of optical lens group among the prior art, the utility model provides an optical lens group.

Example one

As shown in fig. 1 to 30, the optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element; the third lens has negative refractive power; the fourth lens has negative refractive power; the surface of the sixth lens facing the object side is in a concave shape, and the surface of the sixth lens facing the image side is in a concave shape; wherein, the aperture value Fno of the optical lens group satisfies: fno <1.7; half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical lens group, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens meet the following requirements: -9< (f 2+ f 3)/ImgH < -7.

By controlling the surfaces of the sixth lens element facing the object side and the image side to be concave, the image height of the optical lens assembly on the image plane can be increased. By controlling the refractive power of the third lens and the fourth lens to be negative, the aberration generated by the optical lens group can be balanced, and the imaging quality of the optical lens group can be improved. By controlling the aperture value Fno of the optical lens group to be less than 1.7, the characteristic of large aperture of the optical lens group can be realized. Meanwhile, the sensitivity of the second lens and the third lens can be reduced by limiting (f 2+ f 3)/ImgH within a reasonable range, so that the matching of all the lenses is facilitated, the aberration of the optical lens group is better eliminated, the imaging quality of the optical lens group is improved, and meanwhile, the optical lens group has a better processing technology. In addition, the relative illumination of the large image plane of the optical lens group can be effectively ensured, and the optical lens group has higher optical performance and ensures the imaging quality of the optical lens group.

In addition, the first lens to the sixth lens are mostly aspheric surfaces, and since the aspheric surfaces are configured by rotating a curved surface in a meridian plane around an optical axis once, the aspheric surfaces have rotational symmetry, and in an ideal optical system, the aspheric surfaces can perfectly correct aberrations of a noon surface and a sagittal surface. Meanwhile, the unique aspheric lens model can provide enough space for subsequent related adjustment, so that the adjustment space on related structures and assembly processes is larger, and the imaging quality is not reduced too much due to assembly and process limitations. The imaging quality of the optical lens group is effectively guaranteed by matching the characteristics of the six-piece type optical lens group and the large aperture, and meanwhile, the number of the lenses of the six-piece type optical lens group is not very large, so that huge workload can not be brought to assembly.

Preferably, the half length ImgH of the diagonal line of the effective pixel area on the imaging surface of the optical lens group, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -8.5< (f 2+ f 3)/ImgH < -7.

In this embodiment, the maximum half field angle Semi-FOV of the optical lens group, the half length ImgH of the diagonal of the effective pixel area on the imaging plane of the optical lens group, the effective focal length f3 of the third lens element, and the effective focal length f4 of the fourth lens element satisfy: -18< (f 3+ f 4)/(ImgH tan (Semi-FOV)) < -12. By controlling (f 3+ f 4)/(ImgH tan (Semi-FOV)) within a reasonable range, the sensitivity of the third lens and the fourth lens can be reduced, the too tight tolerance requirement can be avoided, the overall layout of the optical lens group can be balanced, the optical lens group is ensured to have a large field angle, and the imaging quality of the marginal field of view is improved. The value of the image height can ensure the image surface size of the optical lens group, so that the shooting of the optical lens group is clearer. Preferably, -18< (f 3+ f 4)/(ImgH tan (Semi-FOV)) < -12.5.

In the present embodiment, the maximum half field angle Semi-FOV of the optical lens group, the on-axis distance SL from the stop of the optical lens group to the imaging plane of the optical lens group, and the entrance pupil diameter EPD of the optical lens group satisfy: 1.5 nls/EPD tan (Semi-FOV) <1.8. The entrance pupil diameter is limited within a reasonable range by limiting SL/EPD star tan (Semi-FOV) within a reasonable range to ensure the luminous flux of the optical lens group and ensure the imaging clarity of the optical lens group. Meanwhile, the overall layout of the optical lens group can be balanced, which is beneficial to balancing the distortion, the coma aberration and the chromatic aberration of the optical lens group, correcting the field curvature and the astigmatism, and ensuring that the edge field of view has high imaging quality under a large field angle. In addition, the length of the optical lens group can be effectively controlled, and the development of the optical lens group towards miniaturization, lightness and thinness is facilitated. Preferably, 1.5-sl/EPD tan (Semi-FOV) <1.75.

In this embodiment, the on-axis distance TTL from the object-side facing surface of the first lens element to the image plane of the optical lens group, the aperture value Fno of the optical lens group, and the on-axis distance BFL from the image-side facing surface of the sixth lens element to the image plane of the optical lens group satisfy: 3-and-are TTL/BFL/Fno <4. Through restricting TTL/BFL/Fno at reasonable within range, can effectively restrict the length of optical lens group, do benefit to optical lens group and develop towards miniaturization frivolousization. In addition, the size of the rear focal point of the optical lens group can be controlled, which is beneficial to the placement of the color filter and the design of other mechanism parts at the rear of the optical lens group. In addition, the aperture value of the optical lens group is controlled, so that the optical lens group can achieve the characteristic of large aperture. Preferably, 3-plus TTL/BFL/Fno <3.5.

In this embodiment, a radius of curvature R1 of a surface of the first lens facing the object side and a radius of curvature R2 of a surface of the first lens facing the image side satisfy: 1< (R1 + R2)/(R2-R1) <2. By controlling (R1 + R2)/(R2-R1) within a reasonable range, the curvature radius of the surface facing the object side and the curvature radius of the surface facing the image side of the first lens are favorably and reasonably set, the sensitivity of the first lens is reduced, and the first lens keeps good process processability. In addition, the arrangement is such that the degree of curvature of the surface of the first lens element facing the object side and the surface of the first lens element facing the image side is not too large, which is helpful for compressing the axial distance from the surface of the first lens element facing the object side to the image plane of the optical lens assembly, so that the refractive power of the optical lens assembly is reasonably distributed and is not excessively concentrated on the first lens element. Meanwhile, the optical lens group is beneficial to aberration correction of other lenses, and the imaging quality of the optical lens group is ensured. Preferably, 1.4< (R1 + R2)/(R2-R1) <1.8.

In this embodiment, the curvature radius R1 of the surface of the first lens facing the object side, the curvature radius R2 of the surface of the first lens facing the image side, and the effective focal length f1 of the first lens satisfy: 0.4 and are (f 1/(R2-R1) <1. By controlling f 1/(R2-R1) within a reasonable range, the size of the optical lens set can be effectively reduced, so that the refractive power of the optical lens set is reasonably distributed, the optical lens set is not excessively concentrated on the first lens, the sensitivity of the first lens is reduced, and meanwhile, the first lens can keep good process processability. In addition, the optical lens group is beneficial to aberration correction of other lenses, and the imaging quality of the optical lens group is ensured. Preferably, 0.4-f1/(R2-R1) <0.9.

In this embodiment, the radius of curvature R3 of the surface facing the object side of the second lens, the radius of curvature R4 of the surface facing the image side of the second lens, the radius of curvature R7 of the surface facing the object side of the fourth lens, and the radius of curvature R8 of the surface facing the image side of the fourth lens satisfy: 0.7< (R3 + R4)/(R7 + R8) <1. By limiting (R3 + R4)/(R7 + R8) within a reasonable range, the curvature radius of the second lens and the curvature radius of the fourth lens can be reasonably controlled, astigmatism and coma between the second lens and the fourth lens are effectively balanced, and the optical lens group can keep better imaging quality. Meanwhile, the sensitivity of the second lens and the fourth lens is reduced, and the processing requirement is favorably met. Preferably, 0.75< (R3 + R4)/(R7 + R8) <0.95.

In this embodiment, an on-axis distance TTL between a surface of the first lens element facing the object side and an imaging plane of the optical lens group, an on-axis distance BFL between a surface of the sixth lens element facing the image side and an imaging plane of the optical lens group, and an on-axis distance Tr9r12 between a surface of the fifth lens element facing the object side and a surface of the sixth lens element facing the image side satisfy: 0.45< (Tr 9r12+ BFL)/TTL <0.55. By limiting (Tr 9r12+ BFL)/TTL within a reasonable range, the risk of ghost images of the optical lens group can be effectively reduced. (Tr 9r12+ BFL) is the distance from the fifth lens to the imaging surface, and (Tr 9r12+ BFL)/TTL is the proportion of the distance from the fifth lens to the imaging surface to the total length of the optical lens group, so that the machinability of the fifth lens and the sixth lens can be effectively ensured, the matching of the thickness of the fifth lens and the sixth lens and the total length of the optical lens group can be reasonably controlled, and the optical lens group is favorably developed towards miniaturization, lightness and thinness. Preferably, 0.46< (Tr 9r12+ BFL)/TTL <0.51.

In the present embodiment, the central thickness CT1 of the first lens and the central thickness CT5 of the fifth lens satisfy: 0.8-straw CT1/CT5<1.2. By limiting the CT1/CT5 within a reasonable range, the thicknesses of the first lens and the fifth lens are favorably and reasonably distributed, the longitudinal spherical aberration of the optical lens group can be improved, and the ghost image at the center of the image surface is improved. In addition, the stability of the structure of the optical lens group can be enhanced. Preferably, 0.81-straw CT1/CT5<1.2.

In the present embodiment, the central thickness CT1 of the first lens, the central thickness CT6 of the sixth lens, the edge thickness ET1 of the first lens and the edge thickness ET6 of the sixth lens satisfy: 0.7< (ET 1/CT 1)/(CT 6/ET 6) <1. By limiting (ET 1/CT 1)/(CT 6/ET 6) within a reasonable range, the structural sizes of the first lens and the sixth lens can be effectively controlled, the edges of the lenses are prevented from being too thin, the overall shape of the lenses is ensured, good processability is kept, and the distortion influence quantity of the optical lens group is balanced. Preferably, 0.75< (ET 1/CT 1)/(CT 6/ET 6) <1.

In this embodiment, an on-axis distance TD between a surface of the first lens facing the object side and a surface of the sixth lens facing the image side, and a sum Σ ET of edge thicknesses of the first lens to the sixth lens on the optical axis of the optical lens group satisfy: 0.7< ∑ ET/TD <0.9. By limiting the sigma ET/TD within a reasonable range, the structural size of each lens of the optical lens group can be effectively controlled, and the difficulty in process machining due to the fact that the lens is too thin and thin is avoided. In addition, the total length of the optical lens group can be effectively limited, and the development of the optical lens group towards miniaturization, lightness and thinness is facilitated. Preferably, 0.75< ∑ ET/TD <0.85.

In this embodiment, the central thickness CT2 of the second lens element on the optical axis of the optical lens group, the central thickness CT3 of the third lens element on the optical axis of the optical lens group, and the distance T23 of the air gap between the second lens element and the third lens element on the optical axis of the optical lens group satisfy: 1 is formed by T23/(CT 2+ CT 3) less than or equal to 1.1. By limiting T23/(CT 2+ CT 3) within a reasonable range, the longitudinal spherical aberration of the optical lens group can be improved, the ghost image at the center of the imaging surface of the optical lens group is improved, and the imaging quality of the optical lens group is improved. In addition, the stability of the structure of the optical lens group can be enhanced. Preferably, 1.01 T23/(CT 2+ CT 3) ≦ 1.1.

In this embodiment, an on-axis distance SAG61 from an intersection point of a surface of the sixth lens facing the object side and the optical axis of the optical lens group to a vertex of an effective radius of the surface of the sixth lens facing the object side, and an on-axis distance SAG62 from an intersection point of the surface of the sixth lens facing the image side and the optical axis of the optical lens group to a vertex of an effective radius of the surface of the sixth lens facing the image side satisfy: 1 is less than or equal to SAG61/SAG62 and less than 2. By limiting SAG61/SAG62 within a reasonable range, the lens shape of the sixth lens can be ensured, and the workability of the optical lens group can be improved. In addition, the optical lens group has good evasion function on stray light and ghost images, and the imaging quality of the optical lens group is ensured. Preferably, 1. Ltoreq. SAG61/SAG62<1.8.

In this embodiment, the abbe number of four of the six lenses of the optical lens group is greater than 50, which is beneficial to the chromatic aberration balance of the optical lens group and ensures the imaging quality of the optical lens group.

In this embodiment, the optical lens assembly further includes a diaphragm, the diaphragm is located at an object side of the first lens, a surface of the first lens facing the object side is convex, and the first lens is a meniscus lens; the surface of the second lens facing the object side is a convex shape, and the second lens is a meniscus lens. By controlling the surface shapes of the first lens and the second lens and the position of the diaphragm, the machinability of the optical lens group can be effectively ensured. In addition, the optical lens group is matched with each lens of the optical lens group, so that the risk of ghost images of the optical lens group can be effectively reduced, and the imaging quality of the optical lens group is ensured.

Example two

As shown in fig. 1 to 30, the optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element; the third lens has negative refractive power; the fourth lens has negative refractive power; the surface of the sixth lens facing the object side is in a concave shape, and the surface of the sixth lens facing the image side is in a concave shape; wherein, the aperture value Fno of the optical lens group satisfies: fno <1.7; the maximum half field angle Semi-FOV of the optical lens group, the on-axis distance SL from the diaphragm of the optical lens group to the imaging surface of the optical lens group and the entrance pupil diameter EPD of the optical lens group meet the following requirements: 1.5 sL/EPD tan (Semi-FOV) <1.8.

By controlling the surfaces of the sixth lens element facing the object side and the image side to be concave, the image height of the optical lens assembly on the image plane can be increased. By controlling the refractive power of the third lens and the fourth lens to be negative, the aberration generated by the optical lens group can be balanced, and the imaging quality of the optical lens group can be improved. By controlling the aperture value Fno of the optical lens group to be less than 1.7, the characteristic of large aperture of the optical lens group can be realized. The entrance pupil diameter is limited within a reasonable range by limiting SL/EPD star tan (Semi-FOV) within a reasonable range to ensure the luminous flux of the optical lens group and ensure the imaging clarity of the optical lens group. Meanwhile, the overall layout of the optical lens group can be balanced, which is beneficial to balancing the distortion, the coma aberration and the chromatic aberration of the optical lens group, correcting the field curvature and the astigmatism, and ensuring that the edge field of view has high imaging quality under a large field angle. In addition, the length of the optical lens group can be effectively controlled, and the development of the optical lens group towards miniaturization, lightness and thinness is facilitated.

Preferably, the maximum half field angle Semi-FOV of the optical lens group, the on-axis distance SL from the diaphragm of the optical lens group to the imaging plane of the optical lens group, and the entrance pupil diameter EPD of the optical lens group satisfy: 1.5 nls/EPD tan (Semi-FOV) <1.75.

In this embodiment, an on-axis distance TTL from the object-side surface of the first lens element to the image plane of the optical lens group, an aperture value Fno of the optical lens group, and an on-axis distance BFL from the image-side surface of the sixth lens element to the image plane of the optical lens group satisfy: 3-and-are TTL/BFL/Fno <4. Through restricting TTL/BFL/Fno at reasonable within range, can effectively restrict the length of optical lens group, do benefit to optical lens group and develop towards miniaturization frivolousization. In addition, the size of the rear focus of the optical lens group can be controlled, which is beneficial to the placement of the color filter and the design of other mechanism parts at the rear of the optical lens group. In addition, the optical lens group can achieve the characteristic of large aperture by controlling the aperture value of the optical lens group. Preferably, 3< -TTL/BFL/Fno <3.5.

In this embodiment, a radius of curvature R1 of a surface of the first lens facing the object side and a radius of curvature R2 of a surface of the first lens facing the image side satisfy: 1< (R1 + R2)/(R2-R1) <2. By controlling (R1 + R2)/(R2-R1) within a reasonable range, the curvature radius of the surface facing the object side and the curvature radius of the surface facing the image side of the first lens are favorably and reasonably set, the sensitivity of the first lens is reduced, and the first lens keeps good process processability. In addition, the arrangement is such that the degree of curvature of the surfaces of the first lens element facing the object side and the image side is not too large, which is helpful for compressing the axial distance from the surface of the first lens element facing the object side to the image plane of the optical lens assembly, so that the refractive power of the optical lens assembly is reasonably distributed and not excessively concentrated on the first lens element. Meanwhile, the optical lens group is beneficial to aberration correction of other lenses, and the imaging quality of the optical lens group is ensured. Preferably, 1.4< (R1 + R2)/(R2-R1) <1.8.

In this embodiment, the radius of curvature R1 of the surface of the first lens facing the object side, the radius of curvature R2 of the surface of the first lens facing the image side, and the effective focal length f1 of the first lens satisfy: 0.4 sj & lt f1/(R2-R1) <1. By controlling f 1/(R2-R1) within a reasonable range, the size of the optical lens assembly can be effectively reduced, so that the refractive power of the optical lens assembly can be reasonably distributed, the optical lens assembly is not excessively concentrated on the first lens, the sensitivity of the first lens is reduced, and the first lens can keep good process processability. In addition, the optical lens group is beneficial to aberration correction of other lenses, and the imaging quality of the optical lens group is ensured. Preferably, 0.4-f 1/(R2-R1) <0.9.

In this embodiment, the radius of curvature R3 of the surface of the second lens facing the object side, the radius of curvature R4 of the surface of the second lens facing the image side, the radius of curvature R7 of the surface of the fourth lens facing the object side, and the radius of curvature R8 of the surface of the fourth lens facing the image side satisfy: 0.7< (R3 + R4)/(R7 + R8) <1. Through limiting (R3 + R4)/(R7 + R8) in a reasonable range, the curvature radius of the second lens and the curvature radius of the fourth lens can be reasonably controlled, astigmatism and coma between the second lens and the fourth lens are effectively balanced, and the optical lens group can keep better imaging quality. Meanwhile, the sensitivity of the second lens and the fourth lens is reduced, and the processing requirement is favorably met. Preferably, 0.75< (R3 + R4)/(R7 + R8) <0.95.

In this embodiment, an on-axis distance TTL between a surface of the first lens element facing the object side and an imaging plane of the optical lens group, an on-axis distance BFL between a surface of the sixth lens element facing the image side and an imaging plane of the optical lens group, and an on-axis distance Tr9r12 between a surface of the fifth lens element facing the object side and a surface of the sixth lens element facing the image side satisfy: 0.45< (Tr 9r12+ BFL)/TTL <0.55. By limiting (Tr 9r12+ BFL)/TTL to be within a reasonable range, the risk of ghost images of the optical lens group can be effectively reduced. The (Tr 9r12+ BFL) is a distance from the fifth lens to the imaging surface, and the (Tr 9r12+ BFL)/TTL is a ratio of a distance from the fifth lens to the imaging surface to the total length of the optical lens assembly, so that the workability of the fifth lens and the sixth lens can be effectively ensured, the thickness of the fifth lens and the sixth lens can be reasonably controlled to match the total length of the optical lens assembly, and the optical lens assembly is favorable for miniaturization, lightness and thinness development. Preferably, 0.46< (Tr 9r12+ BFL)/TTL <0.51.

In the present embodiment, the central thickness CT1 of the first lens and the central thickness CT5 of the fifth lens satisfy: 0.8 sP CT1/CT5<1.2. By limiting the CT1/CT5 within a reasonable range, the thicknesses of the first lens and the fifth lens are favorably and reasonably distributed, the longitudinal spherical aberration of the optical lens group can be improved, and the ghost image at the center of the image surface is improved. In addition, the stability of the structure of the optical lens group can be enhanced. Preferably, 0.81-P CT1/CT5<1.2.

In the present embodiment, the central thickness CT1 of the first lens, the central thickness CT6 of the sixth lens, the edge thickness ET1 of the first lens and the edge thickness ET6 of the sixth lens satisfy: 0.7< (ET 1/CT 1)/(CT 6/ET 6) <1. Through restricting (ET 1/CT 1)/(CT 6/ET 6) at reasonable within range, can effectively control the structure size of first lens and sixth lens, prevent that the lens edge is too thin, ensure the whole shape of lens to keep good processing nature, the distortion influence volume of balanced optics lens group. Preferably, 0.75< (ET 1/CT 1)/(CT 6/ET 6) <1.

In this embodiment, an axial distance TD between a surface of the first lens facing the object side and a surface of the sixth lens facing the image side, and a sum Σ ET of edge thicknesses of the first lens and the sixth lens on the optical axis of the optical lens group satisfy: 0.7< ∑ ET/TD <0.9. By limiting the sigma ET/TD within a reasonable range, the structural size of each lens of the optical lens group can be effectively controlled, and the difficulty in process machining due to the fact that the lens is too thin and thin is avoided. In addition, the total length of the optical lens group can be effectively limited, and the development of the optical lens group towards miniaturization, lightness and thinness is facilitated. Preferably, 0.75< ∑ ET/TD <0.85.

In this embodiment, the central thickness CT2 of the second lens on the optical axis of the optical lens group, the central thickness CT3 of the third lens on the optical axis of the optical lens group, and the distance T23 of the air gap between the second lens and the third lens on the optical axis of the optical lens group satisfy: 1 is formed by T23/(CT 2+ CT 3) less than or equal to 1.1. By limiting T23/(CT 2+ CT 3) within a reasonable range, the longitudinal spherical aberration of the optical lens assembly can be improved, the ghost image at the center of the imaging surface of the optical lens assembly can be improved, and the imaging quality of the optical lens assembly can be improved. In addition, the stability of the structure of the optical lens group can be enhanced. Preferably, 1.01 T23/(CT 2+ CT 3) ≦ 1.1.

In this embodiment, an on-axis distance SAG61 from an intersection point of a surface of the sixth lens facing the object side and the optical axis of the optical lens group to a vertex of an effective radius of the surface of the sixth lens facing the object side, and an on-axis distance SAG62 from an intersection point of the surface of the sixth lens facing the image side and the optical axis of the optical lens group to a vertex of an effective radius of the surface of the sixth lens facing the image side satisfy: 1 is less than or equal to SAG61/SAG62 and less than 2. By limiting SAG61/SAG62 to a reasonable range, the lens shape of the sixth lens can be ensured, and the processability of the optical lens group can be improved. In addition, the optical lens group has good evasion function on stray light and ghost images, and the imaging quality of the optical lens group is ensured. Preferably, 1. Ltoreq. SAG61/SAG62<1.8.

In this embodiment, the optical lens assembly further includes a diaphragm, the diaphragm is located at an object side of the first lens, a surface of the first lens facing the object side is convex, and the first lens is a meniscus lens; the surface of the second lens facing the object side is a convex shape, and the second lens is a meniscus lens. The machinability of the optical lens group can be effectively ensured by controlling the surface shapes of the first lens and the second lens and the position of the diaphragm. In addition, the optical lens group is matched with each lens of the optical lens group, so that the risk of ghost images of the optical lens group can be effectively reduced, and the imaging quality of the optical lens group is ensured.

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

The optical lens assembly in the present application can employ a plurality of lenses, such as the above six lenses. By reasonably distributing the refractive power, the surface shape, the center thickness of each lens, the on-axis distance between each lens and the like, the aperture of the optical lens group 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 lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The optical lens group also has the advantages of large aperture, large field angle and good imaging quality, and can meet the miniaturization requirement of intelligent electronic products.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens has the characteristics that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the lens center to the lens periphery, an aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

However, it is understood by those skilled in the art that the number of lenses constituting the optical lens group may be varied to obtain the various results and advantages described in the present description without departing from the technical solutions claimed in the present application. For example, although six lenses are exemplified in the embodiments, the optical lens group is not limited to include six lenses. The optical lens set can also include other numbers of lenses, if necessary.

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

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

Example one

Fig. 1 to 5 show an optical lens assembly according to a first example of the present application. Fig. 1 is a schematic diagram illustrating a structure of an optical lens assembly according to an example one.

As shown in fig. 1, the optical lens assembly 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 filter E7 and an image plane S15.

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

In this example, the total effective focal length f of the optical lens group is 4.89mm, the maximum half field of view Semi-FOV of the optical lens group is 39.99 °, the total length TTL of the optical lens group is 6.10mm, the image height ImgH of the optical lens group is 4.21mm, and the f-number Fno of the optical lens group is 1.63.

Table 1 shows a table of basic structural parameters of the optical lens assembly of example one, wherein the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 1

In example one, a surface facing the object side and a surface facing the image side of any one of the first lens E1 to the sixth lens E6 are aspheric, and a surface type of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient values A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24 that can be used for the aspherical mirror surfaces S1-S12 in example one.

TABLE 2

Fig. 2 shows an axial chromatic aberration curve of the optical lens assembly of the first example, which shows the deviation of the convergent focus of light rays with different wavelengths after passing through the optical lens assembly. Fig. 3 shows a chromatic aberration of magnification curve of the optical lens assembly of the first example, which shows the deviation of different image heights of the light passing through the optical lens assembly on the image plane. FIG. 4 shows astigmatism curves for the first example set of optical lenses representing meridional field curvature and sagittal field curvature. Fig. 5 shows distortion curves of the optical lens assembly of the first example, which show distortion magnitude values corresponding to different angles of view.

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

Example two

Fig. 6 to 10 show an optical lens assembly according to the second embodiment of the present application. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 6 is a diagram illustrating a structure of a second optical lens set of example two.

As shown in fig. 6, the optical lens assembly 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 filter E7 and an image plane S15.

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

In this example, the total effective focal length f of the optical lens group is 4.76mm, the maximum half field of view Semi-FOV of the optical lens group is 40.78 °, the total length TTL of the optical lens group is 5.93mm, the image height ImgH of the optical lens group is 4.20mm, and the f-number Fno of the optical lens group is 1.63.

Table 3 shows a table of basic structural parameters of the optical lens assembly of example two, wherein the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 3

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

TABLE 4

Fig. 7 shows an axial chromatic aberration curve of the optical lens assembly of example two, which shows the deviation of the convergence focus of light rays with different wavelengths after passing through the optical lens assembly. Fig. 8 shows a chromatic aberration of magnification curve of the optical lens assembly of the second example, which shows the deviation of different image heights of the light passing through the optical lens assembly on the image plane. FIG. 9 shows astigmatism curves of the second set of optical lenses, representing meridional field curvature and sagittal field curvature. Fig. 10 shows distortion curves of the second optical lens set of example two, which indicate distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 7 to 10, the optical lens assembly of the second example can achieve good imaging quality.

EXAMPLE III

As shown in fig. 11 to 15, an optical lens assembly of example three of the present application is described. Fig. 11 is a schematic diagram illustrating a structure of an optical lens set of example three.

As shown in fig. 11, the optical lens assembly 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 filter E7 and an image plane S15.

In this example, the total effective focal length f of the optical lens assembly is 5.06mm, the maximum half field of view Semi-FOV of the optical lens assembly is 40.03 °, the total length TTL of the optical lens assembly is 6.30mm, the image height ImgH of the optical lens assembly is 4.36mm, and the f-number Fno of the optical lens assembly is 1.64.

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

TABLE 5

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

TABLE 6

Fig. 12 shows an axial chromatic aberration curve of the optical lens assembly of example three, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical lens assembly. Fig. 13 shows a chromatic aberration of magnification curve of the optical lens assembly of example three, which shows the deviation of different image heights of the light passing through the optical lens assembly on the image plane. FIG. 14 shows astigmatism curves for the optical lens group of example three, which represent meridional field curvature and sagittal field curvature. Fig. 15 shows distortion curves of the optical lens group of example three, which show values of distortion magnitudes for different angles of view.

As can be seen from fig. 12 to 15, the optical lens assembly of the third example can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an optical lens assembly of example four of the present application is described. Fig. 16 is a schematic diagram of an optical lens set structure in example four.

As shown in fig. 16, the optical lens assembly 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 filter E7 and an image plane S15.

In this example, the total effective focal length f of the optical lens group is 5.10mm, the maximum half field angle Semi-FOV of the optical lens group is 40.38 °, the total length TTL of the optical lens group is 6.31mm, the image height ImgH of the optical lens group is 4.45mm, and the f-number Fno of the optical lens group is 1.65.

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

TABLE 7

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

TABLE 8

Fig. 17 shows on-axis chromatic aberration curves of the optical lens group of example four, which show the deviation of the convergent focus of light rays of different wavelengths after passing through the optical lens group. Fig. 18 shows a chromatic aberration of magnification curve of the optical lens assembly of example four, which shows the deviation of different image heights of the light beam on the image plane after passing through the optical lens assembly. FIG. 19 shows astigmatism curves for the optical lens group of example four, representing meridional and sagittal image planes curvature. Fig. 20 shows a distortion curve of the optical lens assembly of example four, which shows values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 17 to 20, the optical lens assembly of example four can achieve good imaging quality.

Example five

Fig. 21 to 25 show an optical lens assembly according to example five of the present application. Fig. 21 is a schematic diagram illustrating a structure of an optical lens group in example five.

As shown in fig. 21, the optical lens assembly 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 filter E7 and an image plane S15.

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

In this example, the total effective focal length f of the optical assembly is 5.16mm, the maximum half field of view Semi-FOV of the optical assembly is 41.41 °, the total length TTL of the optical assembly is 6.50mm, the image height ImgH of the optical assembly is 4.66mm, and the f-number Fno of the optical assembly is 1.66.

Table 9 shows a table of basic structural parameters for the optical lens set of example five, wherein the radius of curvature, thickness/distance, focal length, and effective radius are all in 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.

TABLE 10

Fig. 22 shows an axial chromatic aberration curve of the optical lens group of example five, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical lens group. Fig. 23 shows a chromatic aberration of magnification curve of the optical lens assembly of example five, which shows the deviation of different image heights of light rays passing through the optical lens assembly on the image plane. FIG. 24 shows astigmatism curves for the optical lens group of example five, representing meridional and sagittal image planes curvature. Fig. 25 shows distortion curves of the optical lens group of example five, which show values of distortion magnitudes for different angles of view.

As can be seen from fig. 22 to 25, the optical lens assembly of example five can achieve good imaging quality.

Example six

Fig. 26 to 30 show an optical lens assembly according to example six of the present application. Fig. 26 is a schematic diagram illustrating an optical lens group structure of example six.

As shown in fig. 26, the optical lens assembly 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 filter E7 and an image plane S15.

In this example, the total effective focal length f of the optical lens group is 5.14mm, the maximum half field of view Semi-FOV of the optical lens group is 42.44 °, the total length TTL of the optical lens group is 6.50mm, the image height ImgH of the optical lens group is 4.81mm, and the f-number Fno of the optical lens group is 1.66.

Table 11 shows a basic structural parameter table of the optical lens group of example six, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 11

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

TABLE 12

Fig. 27 shows an on-axis chromatic aberration curve of the optical lens group of example six, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical lens group. Fig. 28 is a chromatic aberration of magnification curve of the optical lens assembly of example six, which shows the deviation of different image heights of light passing through the optical lens assembly on the image plane. FIG. 29 shows astigmatism curves for the optical lens group of example six, which represent meridional field curvature and sagittal field curvature. Fig. 30 shows distortion curves of the optical lens group of example six, which show values of distortion magnitudes for different angles of view.

As can be seen from fig. 27 to 30, the optical lens assembly of example six can achieve good imaging quality.

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

Conditions/examples	1	2	3	4	5	6
							(f2+f3)/ImgH	-7.16	-8.05	-7.28	-7.61	-7.32	-7.43
(f3+f4)/(ImgH*tan(Semi-FOV))	-15.85	-17.71	-15.10	-14.51	-13.38	-12.69
							SL/EPD*tan(Semi-FOV)	1.52	1.57	1.55	1.56	1.66	1.73
TTL/BFL/Fno	3.42	3.40	3.24	3.08	3.24	3.41
							(R1+R2)/(R2-R1)	1.45	1.46	1.58	1.75	1.71	1.69
f1/(R2-R1)	0.49	0.50	0.65	0.89	0.84	0.81
							(R3+R4)/(R7+R8)	0.79	0.79	0.94	0.90	0.90	0.92
(Tr9r12+BFL)/TTL	0.47	0.48	0.47	0.48	0.50	0.49
							CT1/CT5	1.10	1.13	1.19	1.12	0.85	0.82
(ET1/CT1)/(CT6/ET6)	0.76	0.87	0.96	0.86	0.85	0.76
							∑ET/TD	0.80	0.80	0.80	0.78	0.82	0.79
T23/(CT2+CT3)	1.03	1.02	1.03	1.03	1.03	1.10
							SAG61/SAG62	1.41	1.26	1.52	1.62	1.00	1.75

Table 13 table 14 shows the effective focal lengths f of the optical lens sets of examples one to six, and the effective focal lengths f1 to f6 of the respective lenses.

TABLE 14

The present application also provides an imaging device whose electron photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging apparatus 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 lens set described above.

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

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

a first lens;

a second lens;

a third lens element having negative refractive power;

a fourth lens having negative refractive power;

a fifth lens;

a sixth lens element having a concave surface facing the object side and a concave surface facing the image side;

wherein, the aperture value Fno of the optical lens group satisfies: fno <1.7;

half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical lens group, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -9< (f 2+ f 3)/ImgH < -7.

2. The optical lens group of claim 1, wherein the maximum half field angle Semi-FOV of the optical lens group, half ImgH of the diagonal of the effective pixel area on the imaging surface of the optical lens group, the effective focal length f3 of the third lens element and the effective focal length f4 of the fourth lens element satisfy: -18< (f 3+ f 4)/(ImgH tan (Semi-FOV)) < -12.

3. The optical lens group of claim 1, wherein the maximum half field angle Semi-FOV of the optical lens group, the on-axis distance SL from the diaphragm of the optical lens group to the imaging plane of the optical lens group, and the entrance pupil diameter EPD of the optical lens group satisfy: 1.5 sL/EPD tan (Semi-FOV) <1.8.

4. The optical lens group of claim 1, wherein an axial distance TTL from an object-facing surface of the first lens element to an image plane of the optical lens group, an aperture value Fno of the optical lens group, and an axial distance BFL from an image-facing surface of the sixth lens element to an image plane of the optical lens group satisfy: 3 and are constructed with TTL/BFL/Fno <4.

5. The optical lens assembly of claim 1, wherein a radius of curvature R1 of a surface of the first lens element facing the object side and a radius of curvature R2 of a surface of the first lens element facing the image side satisfy: 1< (R1 + R2)/(R2-R1) <2.

6. The optical lens assembly of claim 1, wherein a radius of curvature R1 of a surface of the first lens facing the object side, a radius of curvature R2 of a surface of the first lens facing the image side, and an effective focal length f1 of the first lens satisfy: 0.4 and are (f 1/(R2-R1) <1.

7. The optical lens assembly of claim 1, wherein a radius of curvature R3 of the object-side surface of the second lens element, a radius of curvature R4 of the image-side surface of the second lens element, a radius of curvature R7 of the object-side surface of the fourth lens element, and a radius of curvature R8 of the image-side surface of the fourth lens element satisfy: 0.7< (R3 + R4)/(R7 + R8) <1.

8. The optical lens group of claim 1, wherein an axial distance TTL between an object-facing surface of the first lens element and an image plane of the optical lens group, an axial distance BFL between an image-facing surface of the sixth lens element and the image plane of the optical lens group, and an axial distance Tr9r12 between an object-facing surface of the fifth lens element and an image plane of the sixth lens element satisfy: 0.45< (Tr 9r12+ BFL)/TTL <0.55.

9. The set of optical lenses of claim 1, wherein a center thickness CT1 of the first lens and a center thickness CT5 of the fifth lens satisfy: 0.8-straw CT1/CT5<1.2.

10. The set of optical lenses of claim 1, wherein the center thickness CT1 of the first lens piece, the center thickness CT6 of the sixth lens piece, the edge thickness ET1 of the first lens piece and the edge thickness ET6 of the sixth lens piece satisfy: 0.7< (ET 1/CT 1)/(CT 6/ET 6) <1.

11. The optical lens assembly of claim 1, wherein an axial distance TD between an object-side facing surface of the first lens element and an image-side facing surface of the sixth lens element, and a sum Σ ET of edge thicknesses Σ of the first lens element and the sixth lens element respectively on an optical axis of the optical lens assembly satisfy: 0.7< ∑ ET/TD <0.9.

12. The set of optical lenses of claim 1, wherein the central thickness CT2 of the second lens on the optical axis of the set of optical lenses, the central thickness CT3 of the third lens on the optical axis of the set of optical lenses, the distance T23 of the air gap between the second lens and the third lens on the optical axis of the set of optical lenses satisfy: 1 is formed by T23/(CT 2+ CT 3) less than or equal to 1.1.

13. The optical lens group of claim 1, wherein an axial distance SAG61 from an intersection point of an object-side-facing surface of the sixth lens element and an optical axis of the optical lens group to an effective radius vertex of the object-side-facing surface of the sixth lens element, and an axial distance SAG62 from an intersection point of an image-side-facing surface of the sixth lens element and an optical axis of the optical lens group to an effective radius vertex of the image-side-facing surface of the sixth lens element satisfy: 1 is less than or equal to SAG61/SAG62 and less than 2.

14. The optical lens group of any one of claims 1 to 13, wherein four of the six lenses of the optical lens group have an abbe number greater than 50.

15. The set of optical lenses of one of claims 1 to 13, further comprising a diaphragm positioned on an object side of the first lens,

the surface of the first lens facing the object side is a convex shape, and the first lens is a meniscus lens;

the surface of the second lens facing the object side is in a convex shape, and the second lens is a meniscus lens.

16. An optical lens assembly, in order from an object side to an image side of the optical lens assembly, comprising:

a first lens;

a second lens;

a third lens having negative refractive power;

a fourth lens having negative refractive power;

a fifth lens;

wherein, the aperture value Fno of the optical lens group satisfies: fno <1.7;

the maximum half field angle Semi-FOV of the optical lens group, the axial distance SL from the diaphragm of the optical lens group to the imaging surface of the optical lens group and the entrance pupil diameter EPD of the optical lens group meet the following requirements: 1.5 nls/EPD tan (Semi-FOV) <1.8.

17. The optical lens group of claim 16, wherein an axial distance TTL between an object-facing surface of the first lens element and an image plane of the optical lens group, an aperture value Fno of the optical lens group, and an axial distance BFL between an image-facing surface of the sixth lens element and the image plane of the optical lens group satisfy: 3 and are constructed with TTL/BFL/Fno <4.

18. The optical lens assembly of claim 16, wherein a radius of curvature R1 of a surface of the first lens facing the object side and a radius of curvature R2 of a surface of the first lens facing the image side satisfy: 1< (R1 + R2)/(R2-R1) <2.

19. The optical lens assembly of claim 16, wherein a radius of curvature R1 of a surface of the first lens element facing the object side, a radius of curvature R2 of a surface of the first lens element facing the image side, and an effective focal length f1 of the first lens element satisfy: 0.4 sj & lt f1/(R2-R1) <1.

20. The optical lens assembly of claim 16, wherein a radius of curvature R3 of the object-side surface of the second lens element, a radius of curvature R4 of the image-side surface of the second lens element, a radius of curvature R7 of the object-side surface of the fourth lens element and a radius of curvature R8 of the image-side surface of the fourth lens element satisfy: 0.7< (R3 + R4)/(R7 + R8) <1.

21. The optical lens group of claim 16, wherein an axial distance TTL between an object-facing surface of the first lens element and an image plane of the optical lens group, an axial distance BFL between an image-facing surface of the sixth lens element and the image plane of the optical lens group, and an axial distance Tr9r12 between an object-facing surface of the fifth lens element and an image plane of the sixth lens element satisfy: 0.45< (Tr 9r12+ BFL)/TTL <0.55.

22. The set of optical lenses of claim 16, wherein a center thickness CT1 of the first lens and a center thickness CT5 of the fifth lens satisfy: 0.8-straw CT1/CT5<1.2.

23. The optical lens group of claim 16, wherein a center thickness CT1 of the first lens piece, a center thickness CT6 of the sixth lens piece, an edge thickness ET1 of the first lens piece and an edge thickness ET6 of the sixth lens piece satisfy: 0.7< (ET 1/CT 1)/(CT 6/ET 6) <1.

24. The optical lens group of claim 16, wherein an on-axis distance TD between an object-side-facing surface of the first lens element and an image-side-facing surface of the sixth lens element, and a sum Σ ET of edge thicknesses of the first lens element and the sixth lens element, respectively, on an optical axis of the optical lens group satisfy: 0.7< ∑ ET/TD <0.9.

25. The set of optical lenses of claim 16, wherein a center thickness CT2 of the second lens on an optical axis of the set of optical lenses, a center thickness CT3 of the third lens on an optical axis of the set of optical lenses, a distance T23 of an air gap between the second lens and the third lens on an optical axis of the set of optical lenses satisfy: 1 is formed by T23/(CT 2+ CT 3) less than or equal to 1.1.

26. The optical lens group of claim 16, wherein an axial distance SAG61 from an intersection point of an object-side-facing surface of the sixth lens element and an optical axis of the optical lens group to an effective radius vertex of the object-side-facing surface of the sixth lens element, and an axial distance SAG62 from an intersection point of an image-side-facing surface of the sixth lens element and an optical axis of the optical lens group to an effective radius vertex of the image-side-facing surface of the sixth lens element satisfy: 1 is less than or equal to SAG61/SAG62 and less than 2.

27. The set of optical lenses of any one of claims 16-26, wherein four of the six lenses of the set have abbe numbers greater than 50.

28. The set of optical lenses of any one of claims 16-26, further comprising an aperture on an object side of the first lens,

the surface of the first lens facing the object side is in a convex shape, and the first lens is a meniscus lens;

the surface of the second lens facing the object side is a convex shape, and the second lens is a meniscus lens.