CN113219634A

CN113219634A - Image pickup lens assembly

Info

Publication number: CN113219634A
Application number: CN202110601259.1A
Authority: CN
Inventors: 方铮; 吕赛锋; 姚嘉诚; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-08-06

Abstract

The invention relates to a camera lens group, wherein the lens group comprises the following components arranged from an object side to an image side along an optical axis in sequence: a first lens with a convex object-side surface; a second lens having a convex image-side surface and having a refractive power; a third lens with a convex image-side surface and positive focal power; a fourth lens having a negative optical power; a fifth lens with a convex image-side surface; a sixth lens having optical power; wherein, the distance TTL between the maximum field angle FOV of the camera lens group and the object side surface of the first lens element to the imaging surface of the camera lens group on the optical axis satisfies the following conditions: 5 xtan (FOV-90 degree)/TTL>0.8mm^‑1. The camera lens group with the structure can realize large-scale clear imaging, has the characteristics of ultra-thinness and miniaturization, and can be applied to the fields of vehicle-mounted monitoring, security monitoring and the like.

Description

Image pickup lens assembly

Technical Field

The invention relates to the field of optical imaging, in particular to a camera lens, and specifically relates to a camera lens group consisting of six lenses.

Background

With the development of optical lens technology, the conventional wide-angle lens has monitoring dead angles when being applied to security and vehicle-mounted due to the limitation of the field angle of the lens. In the prior art, the field angle of a vehicle-mounted lens is generally about 70-90 degrees, and the field angle of a security monitoring lens is generally about 90-120 degrees. Generally, a larger monitoring area needs to be provided with a plurality of camera lenses to realize larger area monitoring, which undoubtedly increases the cost of the lenses and the installation cost, and also increases the cost of the display processing and storage at the back end.

Disclosure of Invention

The invention aims to provide a camera lens group consisting of six lenses, which is a lens group with large view field, large monitoring range, high resolution and clear imaging and meets the market demand in the field of vehicle-mounted and security monitoring.

One aspect of the present invention provides an image capturing lens assembly, comprising, in order from an object side to an image side along an optical axis:

a first lens having a focal power, an object-side surface of which is convex;

the image side surface of the second lens is a convex surface;

the image side surface of the third lens is a convex surface;

a fourth lens having a negative optical power;

a fifth lens with focal power, wherein the image side surface of the fifth lens is convex;

a sixth lens having optical power;

wherein, the distance TTL between the maximum field angle FOV of the camera lens group and the object side surface of the first lens element to the imaging surface of the camera lens group on the optical axis satisfies the following conditions: 5 xtan (FOV-90 degree)/TTL>0.8(mm^-1)。

According to an embodiment of the present invention, the effective focal length f3 of the third lens and the effective focal length f of the image capturing lens group satisfy: 1< f3/f <3.

According to an embodiment of the present invention, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R10 of the image-side surface of the fifth lens satisfy: -15< R1/R10< -4.

According to an embodiment of the present invention, a distance T45 between the fourth lens and the fifth lens on the optical axis and a distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: T45/T56< 0.5.

According to an embodiment of the present invention, a distance T56 between the fifth lens element and the sixth lens element on the optical axis and a distance BFL between an image side surface of the sixth lens element and an image plane of the image capturing lens assembly on the optical axis satisfy: 0.3< T56/BFL < 1.1.

According to an embodiment of the present invention, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: CT2/CT3> 1.3.

According to an embodiment of the present invention, a distance T23 between the second lens and the third lens on the optical axis and a distance T12 between the first lens and the second lens on the optical axis satisfy: T23/T12< 1.4.

According to an embodiment of the present invention, a distance T23 between the second lens and the third lens on the optical axis, a distance T34 between the third lens and the fourth lens on the optical axis, a distance T45 between the fourth lens and the fifth lens on the optical axis, and a distance Tr3r8 between an object-side surface of the second lens and an image-side surface of the fourth lens on the optical axis satisfy: (T23+ T34+ T45)/Tr3r8< 1.5.

According to an embodiment of the present invention, a maximum effective radius DT11 of an object side surface of the first lens element and a distance TTL between the object side surface of the first lens element and an image plane of the image capturing lens group on the optical axis satisfy: 0.4< DT11/TTL < 0.8.

According to an embodiment of the present invention, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT62 of the image-side surface of the sixth lens satisfy: 2< DT11/DT62< 5.

According to an embodiment of the present invention, the maximum effective radius DT11 of the object-side surface of the first lens and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: 1.5< DT11/ImgH <3.

According to an embodiment of the present invention, an edge thickness ET2 of the second lens at the maximum effective diameter and a center thickness CT2 of the second lens satisfy: 0.9< ET2/CT2< 1.2.

According to an embodiment of the present invention, a distance SAG61 on the optical axis between an intersection point of the object-side surface of the sixth lens and the optical axis and an effective radius vertex of the object-side surface of the sixth lens and a central thickness CT6 of the sixth lens satisfy: -2< SAG61/CT6< -1.

According to an embodiment of the present invention, a distance SAG51 on the optical axis between an intersection point of an object-side surface of the fifth lens and the optical axis and an effective radius vertex of the object-side surface of the fifth lens and a distance SAG52 on the optical axis between an intersection point of an image-side surface of the fifth lens and the optical axis and an effective radius vertex of the image-side surface of the fifth lens satisfies: -0.6< SAG51/SAG52 <0.

According to an embodiment of the present invention, a distance SAG41 on the optical axis between an intersection point of an object-side surface of the fourth lens and the optical axis and an effective radius vertex of the object-side surface of the fourth lens and a distance SAG42 on the optical axis between an intersection point of an image-side surface of the fourth lens and the optical axis and an effective radius vertex of the image-side surface of the fourth lens satisfies: i SAG41/SAG42| < 0.3.

According to one embodiment of the present invention, a distance SAG12 on the optical axis between a maximum effective radius DT12 of the image-side surface of the first lens, an intersection point of the image-side surface of the first lens and the optical axis, and an effective radius vertex of the image-side surface of the first lens satisfies: 0.7< DT12/SAG12< 1.2.

According to an embodiment of the present invention, a distance SAG52 on the optical axis between an intersection point of the image-side surface of the fifth lens and the optical axis and an effective radius vertex of the image-side surface of the fifth lens and a distance SAG61 on the optical axis between an intersection point of the object-side surface of the sixth lens and the optical axis and an effective radius vertex of the object-side surface of the sixth lens satisfies: 0.3< SAG52/SAG61 <1.

According to an embodiment of the present invention, the maximum effective radius DT31 of the object-side surface of the third lens and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy: 0.3< DT31/DT52< 0.8.

According to an embodiment of the present invention, a distance SAG21 on the optical axis between an intersection point of the object-side surface of the second lens and the optical axis and an effective radius vertex of the object-side surface of the second lens and a central thickness CT2 of the second lens satisfy: -0.3< SAG21/CT2< 0.

According to an embodiment of the present invention, a distance SAG11 on the optical axis between an intersection point of the object-side surface of the first lens and the optical axis and an effective radius vertex of the object-side surface of the first lens and a central thickness CT1 of the first lens satisfy: 0 is less than or equal to (SAG11-CT1)/CT1 is less than 1.

According to an embodiment of the present invention, the maximum effective radius DT62 of the image-side surface of the sixth lens, the maximum effective radius DT61 of the object-side surface of the sixth lens, and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy: 2< (DT62-DT61)/(DT61-DT52) <4.

Another aspect of the present invention provides an image capturing lens assembly, comprising, in order from an object side to an image side along an optical axis:

a first lens having a focal power, an object-side surface of which is convex;

the image side surface of the second lens is a convex surface;

the image side surface of the third lens is a convex surface;

a fourth lens having a negative optical power;

a sixth lens having optical power;

wherein the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT12 of the image side surface of the first lens satisfy: 1.5< (DT11-DT12)/DT12 <3.

The invention has the beneficial effects that:

the camera lens group provided by the invention comprises a plurality of lenses, such as a first lens to a sixth lens, which have larger field angles and can be used as a fisheye lens, although the difference between object images is large due to larger distortion, the camera lens group with the structure does not influence the resolution at all, and can ensure the one-to-one correspondence between object points and image points, thereby realizing wide-range clear imaging.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a lens assembly according to an embodiment 1 of the present invention;

fig. 1a to 1c are an axial chromatic aberration curve, an astigmatism curve and a magnification chromatic aberration curve of the photographing lens assembly of embodiment 1 of the present invention, respectively;

FIG. 2 is a schematic view of a lens assembly according to embodiment 2 of the present invention;

fig. 2a to 2c are an axial chromatic aberration curve, an astigmatism curve and a magnification chromatic aberration curve of the photographing lens assembly of embodiment 2 of the present invention, respectively;

FIG. 3 is a schematic view of a lens assembly according to embodiment 3 of the present invention;

fig. 3a to 3c are an axial chromatic aberration curve, an astigmatism curve and a magnification chromatic aberration curve of the photographing lens assembly in embodiment 3 of the present invention, respectively;

FIG. 4 is a schematic view of a lens assembly according to embodiment 4 of the present invention;

fig. 4a to 4c are axial chromatic aberration curves, astigmatic curves and chromatic aberration of magnification curves of the photographing lens assembly of embodiment 4 of the present invention, respectively;

FIG. 5 is a schematic view of a lens assembly according to embodiment 5 of the present invention;

fig. 5a to 5c are an axial chromatic aberration curve, an astigmatism curve and a magnification chromatic aberration curve of the photographing lens assembly in accordance with embodiment 5 of the present invention;

FIG. 6 is a schematic view of a lens assembly according to embodiment 6 of the present invention;

fig. 6a to 6c are axial chromatic aberration curves, astigmatic curves, and chromatic aberration of magnification curves of the photographing lens assembly of embodiment 6 according to the present invention;

FIG. 7 is a schematic view of a lens assembly according to embodiment 7 of the present invention;

fig. 7a to 7c are axial chromatic aberration curves, astigmatic curves, and chromatic aberration of magnification curves of the photographing lens assembly of embodiment 7 of the present invention, respectively.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present 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 invention.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

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

In the description of the present invention, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

Unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

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

Exemplary embodiments

The image capturing lens assembly according to an exemplary embodiment of the present invention comprises six lens elements, in order from an object side to an image side along an optical axis: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the lenses are independent from each other, and an air space is formed between the lenses on an optical axis.

In the present exemplary embodiment, the first lens has optical power, and the object-side surface thereof is convex; the second lens has focal power, and the image side surface of the second lens is a convex surface; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power; the fifth lens has focal power, and the image side surface of the fifth lens is a convex surface; the sixth lens has optical power.

In the present exemplary embodiment, the conditional expression that the distance TTL between the maximum field angle FOV of the image capturing lens group and the object-side surface of the first lens element to the image plane of the image capturing lens group on the optical axis satisfies: 5 xtan (FOV-90 degree)/TTL>0.8(mm^-1). The photographing lens group of the design can compress the size of the optical system including the lens group to ensure the ultra-thin characteristic of the lens to meet the requirement of miniaturization of the imaging system. More specifically, the FOV and TTL satisfy: 5 xtan (FOV-90 degree)/TTL>1.30(mm^-1) For example, 5 Xtan (FOV-90 ℃ C.)/TTL ≧ 1.53 (mm)^-1)。

In the present exemplary embodiment, the effective focal length f3 of the third lens element and the effective focal length f of the image pickup lens group satisfy the conditional expression: 1< f3/f <3. By restricting the ratio of the effective focal lengths of the third lens and the camera lens group, the curvature of field of the restriction system can be reasonably controlled within a certain range. More specifically, f3 and f satisfy: 1.10< f3/f <2.5, e.g., 1.15. ltoreq. f 3/f. ltoreq.1.42.

In the present exemplary embodiment, the conditional expression that the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy is: -15< R1/R10< -4. The ratio of the curvature radius of the object side surface of the first lens element to the curvature radius of the image side surface of the fifth lens element is controlled within a certain range, so that the deflection angle of marginal rays of a system comprising the camera lens group can be reasonably controlled, and the sensitivity of the system is effectively reduced. More specifically, R1 and R10 satisfy: 13< R1/R10< -5, for example, -10. ltoreq. R1/R10. ltoreq. 5.24.

In the present exemplary embodiment, the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance T56 between the fifth lens and the sixth lens on the optical axis satisfy the following conditional expression: T45/T56< 0.5. By restricting the ratio of the air space of the fourth lens to the fifth lens to the air space of the fifth lens to the sixth lens, the amount of contribution of curvature of field of each field of view can be controlled within a reasonable range. More specifically, T45 and T56 satisfy: T45/T56<0.4, e.g., T45/T56 ≦ 0.14.

In the exemplary embodiment, the distance T56 between the fifth lens element and the sixth lens element on the optical axis and the distance BFL between the image side surface of the sixth lens element and the image plane of the image capturing lens group on the optical axis satisfy the following conditional expression: 0.3< T56/BFL < 1.1. By restricting the ratio of the air space between the fifth lens and the sixth lens to the distance from the image side surface of the sixth lens to the imaging surface of the image pickup lens group, the performance of the coma aberration of the system comprising the image pickup lens group can be reasonably controlled, so that the optical system has good optical performance. More specifically, T56 and BFL satisfy: 0.35< T56/BFL <1.08, e.g., 0.41 ≦ T56/BFL ≦ 1.07.

In the present exemplary embodiment, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy the following conditional expression: CT2/CT3> 1.3. By controlling the ratio of the central thicknesses of the second lens and the third lens, the distortion of the system can be reasonably regulated and controlled, and finally the distortion of the system is in a certain range. More specifically, CT2 and CT3 satisfy: CT2/CT3>3.0, e.g., CT2/CT3 ≧ 3.54.

In the present exemplary embodiment, the distance T23 between the second lens and the third lens on the optical axis and the distance T12 between the first lens and the second lens on the optical axis satisfy the following conditional expression: T23/T12< 1.4. The field curvature of the system can be effectively ensured by reasonably controlling the ratio of the air space between the second lens and the third lens to the air space between the first lens and the second lens, so that the off-axis field of view of the system can obtain good imaging quality. More specifically, T23 and T12 satisfy: T23/T12<0.46, e.g., T23/T12 ≦ 0.43.

In the present exemplary embodiment, the conditional expressions that the distance T23 on the optical axis between the second lens and the third lens, the distance T34 on the optical axis between the third lens and the fourth lens, the distance T45 on the optical axis between the fourth lens and the fifth lens, and the distance Tr3r8 on the optical axis between the object-side surface of the second lens and the image-side surface of the fourth lens are satisfied are: (T23+ T34+ T45)/Tr3r8< 1.5. The field curvature of the system can be effectively ensured by reasonably controlling the ratio of the sum of the air distance between the second lens and the third lens, the air distance between the third lens and the fourth lens, the air distance between the fourth lens and the fifth lens and the air distance between the object side surface of the second lens and the image side surface of the fourth lens, so that the off-axis field of view of the system comprising the camera lens group obtains good imaging quality. More specifically, T23, T34, T45 and Tr3r8 satisfy: (T23+ T34+ T45)/Tr3r8<1.30, for example, (T23+ T34+ T45)/Tr3r8 ≦ 0.87.

In the exemplary embodiment, the conditional expression that the maximum effective radius DT11 of the object-side surface of the first lens and the distance TTL between the object-side surface of the first lens and the image plane of the image pickup lens group on the optical axis satisfy: 0.4< DT11/TTL < 0.8. The ratio of the maximum effective radius of the object side surface of the first lens and the distance from the object side surface of the first lens to the imaging surface shaft of the camera lens group is restricted in a certain range, so that the characteristics of ultrathin and miniaturization of the lens can be realized. More specifically, DT11 and TTL satisfy: 0.45< DT11/TTL <0.75, e.g., 0.50 ≦ DT11/TTL ≦ 0.70.

In the present exemplary embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT62 of the image-side surface of the sixth lens satisfy the following conditional expression: 2< DT11/DT62< 5. The design is favorable for realizing the imaging quality of miniaturization and wide angle of the module in a balanced manner. More specifically, DT11 and DT62 satisfy: 2.50< DT11/DT62<4.60, e.g., 2.27 ≦ DT11/DT62 ≦ 4.37.

In the exemplary embodiment, the condition that the maximum effective radius DT11 of the object-side surface of the first lens and the half ImgH of the diagonal length of the effective pixel area on the image plane satisfy is as follows: 1.5< DT11/ImgH <3. The design is favorable for realizing the imaging quality of miniaturization and wide angle of the module in a balanced manner. More specifically, DT11 and ImgH satisfy: 1.55< DT11/ImgH <2.85, e.g., 1.63 ≦ DT11/ImgH ≦ 2.79.

In the exemplary embodiment, the edge thickness ET2 of the second lens at the maximum effective diameter and the central thickness CT2 of the second lens satisfy the following conditional expression: 0.9< ET2/CT2< 1.2. The design improves the strength of the second lens, and ensures that the lens has good processing characteristics, so that the forming yield of the lens is ensured to a certain extent, the production and processing yield of the whole lens can be facilitated, and the production efficiency is improved. More specifically, ET2 and CT2 satisfy: 0.95< ET2/CT2<1.15, e.g., 1.01 ≦ ET2/CT2 ≦ 1.07.

In the present exemplary embodiment, a distance SAG61 on the optical axis between an intersection point of the object-side surface of the sixth lens and the optical axis and an effective radius vertex of the object-side surface of the sixth lens and a central thickness CT6 of the sixth lens satisfies the conditional expression: -2< SAG61/CT6< -1. The design can effectively reduce the incident angle of the chief ray on the object side surface of the sixth lens, and can improve the matching degree of the camera lens group and a chip in the camera system. More specifically, SAG61 and CT6 satisfy: -1.90< SAG61/CT6< -1.20, for example, -1.70. ltoreq. SAG61/CT 6. ltoreq.1.43.

In the present exemplary embodiment, a distance SAG51 on the optical axis between an intersection point of the object-side surface of the fifth lens and the optical axis and an effective radius vertex of the object-side surface of the fifth lens and a distance SAG52 on the optical axis between an intersection point of the image-side surface of the fifth lens and the optical axis and an effective radius vertex of the image-side surface of the fifth lens satisfies the conditional expression: -0.6< SAG51/SAG52 <0. The design can effectively control the medium thickness of the fifth lens and improve the plasticity of the fifth lens. More specifically, SAG51 and SAG52 satisfy: -0.5< SAG51/SAG52< -0.10, for example, -0.33. ltoreq. SAG51/SAG 52. ltoreq-0.23.

In the present exemplary embodiment, the conditional expression that a distance SAG41 on the optical axis between an intersection point of the object-side surface of the fourth lens and the optical axis and an effective radius vertex of the object-side surface of the fourth lens and a distance SAG42 on the optical axis between an intersection point of the image-side surface of the fourth lens and the optical axis and an effective radius vertex of the image-side surface of the fourth lens satisfies: i SAG41/SAG42| < 0.3. The design can effectively control the middle thickness of the fourth lens and improve the plasticity of the lens. More specifically, SAG41 and SAG42 satisfy: i SAG41/SAG42| <0.20, e.g., | SAG41/SAG42| ≦ 0.09.

In the present exemplary embodiment, the distance SAG12 on the optical axis, between the intersection point of the maximum effective radius DT12 of the image-side surface of the first lens and the optical axis, and the effective radius vertex of the image-side surface of the first lens, satisfies the conditional expression: 0.7< DT12/SAG12< 1.2. The design can ensure that the light rays with enough field angle enter the optical system. More specifically, DT12 and SAG12 satisfy: 0.75< DT12/SAG12<1.16, e.g., 0.85 ≦ DT12/SAG12 ≦ 1.11.

In the present exemplary embodiment, a distance SAG52 on the optical axis between an intersection point of the image-side surface of the fifth lens and the optical axis and an effective radius vertex of the image-side surface of the fifth lens and a distance SAG61 on the optical axis between an intersection point of the object-side surface of the sixth lens and the optical axis and an effective radius vertex of the object-side surface of the sixth lens satisfies the conditional expression: 0.3< SAG52/SAG61 <1. The design can effectively control the medium thickness of the fifth lens and improve the plasticity of the fifth lens. More specifically, SAG52 and SAG61 satisfy: 0.35< SAG52/SAG61<0.90, e.g., 0.44 ≦ SAG52/SAG61 ≦ 0.85.

In the present exemplary embodiment, the maximum effective radius DT31 of the object-side surface of the third lens and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy the following conditional expression: 0.3< DT31/DT52< 0.8. The design is favorable for improving the processing manufacturability of the third lens and the fifth lens and reducing the molding and manufacturing difficulty. More specifically, DT31 and DT52 satisfy: 0.4< DT31/DT52<0.7, e.g., 0.50 ≦ DT31/DT52 ≦ 0.64.

In the present exemplary embodiment, the distance SAG21 on the optical axis between the intersection point of the object-side surface of the second lens and the optical axis and the effective radius vertex of the object-side surface of the second lens and the central thickness CT2 of the second lens satisfy the conditional expression: -0.3< SAG21/CT2< 0. The design is favorable for reducing the incident angle of the chief ray on the object side surface of the second lens and reducing the eccentricity sensitivity of the second lens. More specifically, SAG21 and CT2 satisfy: -0.20< SAG21/CT2< -0.05, e.g., -0.14. ltoreq. SAG21/CT 2. ltoreq.0.03.

In the present exemplary embodiment, the distance SAG11 on the optical axis between the intersection point of the object-side surface of the first lens and the optical axis and the effective radius vertex of the object-side surface of the first lens and the central thickness CT1 of the first lens satisfy the conditional expression: 0 is less than or equal to (SAG11-CT1)/CT1 is less than 1. The above design ensures a sufficient angle of view of the lens group and improves the strength of the first lens. More specifically, SAG11 and CT1 satisfy: 0.06< (SAG11-CT1)/CT1<0.95, for example, 0.08. ltoreq. of (SAG11-CT1)/CT 1. ltoreq.0.89.

In the exemplary embodiment, the maximum effective radius DT62 of the image-side surface of the sixth lens, the maximum effective radius DT61 of the object-side surface of the sixth lens, and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy the following conditional expressions: 2< (DT62-DT61)/(DT61-DT52) <4. The design is beneficial to improving the processing manufacturability of the fifth lens and the sixth lens and reducing the molding and manufacturing difficulty. More specifically, DT62, DT61 and DT52 satisfy: 2.20< (DT62-DT61)/(DT61-DT52) <3.70, e.g., 2.30< (DT62-DT61)/(DT61-DT52) < 3.58.

In the present exemplary embodiment, the above-described photographing lens group may further include a diaphragm. The diaphragm may be disposed at an appropriate position as needed, for example, the diaphragm may be disposed between the second lens and the third lens. Optionally, the above-mentioned image pickup 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 image capturing lens assembly according to the above embodiment of the present invention may employ a plurality of lenses, for example, the above six lenses. The focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like are reasonably distributed, so that the camera lens group has a larger imaging image surface, has the characteristics of wide imaging range and high imaging quality, and ensures the ultrathin property of the mobile phone.

In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.

In another exemplary embodiment, the imaging lens assembly also includes a first lens element having a convex object-side surface and a convex power, disposed in order from an object side to an image side along an optical axis; the image side surface of the second lens is a convex surface; the image side surface of the third lens is a convex surface; a fourth lens having a negative optical power; a fifth lens with focal power, wherein the image side surface of the fifth lens is convex; a sixth lens having optical power. Unlike the above exemplary embodiment, in this exemplary embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT12 of the image-side surface of the first lens satisfy the following conditional expression: 1.5< (DT11-DT12)/DT12 <3. This design ensures a large field angle of the lens group and improves the strength of the first lens element, while ensuring a high imaging quality of the photographing lens group. More specifically, DT11 and DT12 satisfy: 1.60< (DT11-DT12)/DT12<2.80, e.g., 1.73 ≦ DT11-DT12)/DT12 ≦ 2.65.

Other technical features of the image capturing lens assembly in the exemplary embodiment can also satisfy the conditional expressions in the previous exemplary embodiment, and therefore, are not described herein again.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the imaging lens group can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the image pickup lens group is not limited to include six lenses, and the image pickup lens group may include other numbers of lenses if necessary.

Specific embodiments of an image pickup lens group suitable for the above-described embodiments are further described below with reference to the drawings.

Detailed description of the preferred embodiment 1

Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present invention, wherein the lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15. Wherein:

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

As shown in table 1, a basic parameter table of the imaging lens group of embodiment 1 is shown, in which the curvature radius, focal length, thickness/distance unit are all in millimeters (mm):

TABLE 1

As shown in table 2, in embodiment 1, the on-axis distance TTL from the object-side surface S1 of the first lens element E1 to the image plane S15 is 6.56mm, the half ImgH of the diagonal line length of the effective pixel area on the image plane S15 is 1.88mm, the maximum field angle FOV of the optical imaging system is 204.0 °, the aperture value Fno of the image-capturing lens group is 2.62, and the total effective focal length f of the image-capturing lens group is 1.25 mm. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth in the following table:

TABLE 2

The imaging lens group in embodiment 1 satisfies:

5×tan(FOV-90°)/TTL＝1.17(mm^-1) Wherein, the FOV is the maximum field angle of the camera lens group, and the TTL is the on-axis distance from the object side surface of the first lens to the imaging surface of the camera lens group;

(DT11-DT12)/DT12 ═ 1.74, where DT11 is the maximum effective radius of the object-side surface of the first lens and DT12 is the maximum effective radius of the image-side surface of the first lens;

f3/f is 1.17, wherein f3 is the effective focal length of the third lens, and f is the effective focal length of the image pickup lens group;

R1/R10 is-5.30, where R1 is the radius of curvature of the object-side surface of the first lens and R10 is the radius of curvature of the image-side surface of the fifth lens;

T45/T56 is 0.32, where T45 is the on-axis distance of the fourth to fifth lenses and T56 is the on-axis distance of the fifth to sixth lenses;

T56/BFL is 0.53, where T56 is the on-axis distance from the fifth lens element to the sixth lens element, and BFL is the on-axis distance from the image-side surface of the sixth lens element to the image-side surface of the image capturing lens group;

CT2/CT3 is 1.96, where CT2 is the center thickness of the second lens and CT3 is the center thickness of the third lens;

T23/T12 is 1.26, where T23 is the on-axis distance from the second lens to the third lens, and T12 is the on-axis distance from the first lens to the second lens;

(T23+ T34+ T45)/Tr3r8 is 1.10, where T23 is the on-axis distance from the second lens to the third lens, T34 is the on-axis distance from the third lens to the fourth lens, T45 is the on-axis distance from the fourth lens to the fifth lens, and Tr3r8 is the on-axis distance from the object side of the second lens to the image side of the fourth lens;

DT11/TTL is 0.50, wherein DT11 is the maximum effective radius of the object side surface of the first lens, and TTL is the on-axis distance from the object side surface of the first lens to the imaging surface of the shooting lens group;

DT11/DT62 is 2.35, where DT11 is the maximum effective radius of the object-side surface of the first lens and DT62 is the maximum effective radius of the image-side surface of the sixth lens;

DT11/ImgH is 1.75, where DT11 is the maximum effective radius of the object-side surface of the first lens and ImgH is half the diagonal length of the effective pixel area on the imaging plane.

ET2/CT2 is 1.07, where ET2 is the edge thickness of the second lens at the maximum effective diameter and CT2 is the center thickness of the second lens;

SAG61/CT6 is-1.69, where SAG61 is the on-axis distance between the intersection of the sixth lens object-side surface and the optical axis to the effective radius vertex of the sixth lens object-side surface, and CT6 is the center thickness of the sixth lens;

SAG51/SAG52 is-0.31, wherein SAG51 is the on-axis distance between the intersection of the fifth lens object-side surface and the optical axis and the effective radius vertex of the fifth lens object-side surface, and SAG52 is the on-axis distance between the intersection of the fifth lens image-side surface and the optical axis and the effective radius vertex of the fifth lens image-side surface;

(ii) SAG41/SAG42| ═ 0.15, where SAG41 is the on-axis distance between the intersection of the fourth lens object-side surface and the optical axis and the effective radius vertex of the fourth lens object-side surface, and SAG42 is the on-axis distance between the intersection of the fourth lens image-side surface and the optical axis and the effective radius vertex of the fourth lens image-side surface;

DT12/SAG12 is 1.09, where DT12 is the maximum effective radius of the image side surface of the first lens, and SAG12 is the on-axis distance between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens;

SAG52/SAG61 is 0.80, wherein SAG52 is the on-axis distance between the intersection point of the image side surface of the fifth lens and the optical axis and the effective radius vertex of the image side surface of the fifth lens, and SAG61 is the on-axis distance between the intersection point of the object side surface of the sixth lens and the optical axis and the effective radius vertex of the object side surface of the sixth lens;

DT31/DT52 is 0.50, where DT31 is the maximum effective radius of the object-side surface of the third lens and DT52 is the maximum effective radius of the image-side surface of the fifth lens;

SAG21/CT2 is-0.14, where SAG21 is the on-axis distance between the intersection of the second lens object-side surface and the optical axis to the effective radius vertex of the second lens object-side surface, and CT2 is the center thickness of the second lens;

(SAG11-CT1)/CT1 is 0.45, where SAG11 is the on-axis distance between the intersection of the first lens object-side surface and the optical axis to the effective radius vertex of the first lens object-side surface, and CT1 is the center thickness of the first lens;

(DT62-DT61)/(DT61-DT52) is 2.71, where DT62 is the maximum effective radius of the image-side surface of the sixth lens, DT61 is the maximum effective radius of the object-side surface of the sixth lens, and DT52 is the maximum effective radius of the image-side surface of the fifth lens.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.

In example 1, the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 are aspheric surfaces, and table 3 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S12 in example 1:

TABLE 3

Fig. 1a shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 1, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 1b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 1. Fig. 1c shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 1a to 1c, the imaging lens assembly according to embodiment 1 can achieve good imaging quality.

Specific example 2

Fig. 2 is a schematic view of a lens assembly according to embodiment 2 of the present invention, the lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15. Wherein:

As shown in table 4, a basic parameter table of the imaging lens group of embodiment 2 is shown, in which the curvature radius, focal length, thickness/distance unit are all in millimeters (mm):

TABLE 4

As shown in table 5, in embodiment 2, the on-axis distance TTL from the object-side surface S1 of the first lens element E1 to the image plane S15 is 6.56mm, the half ImgH of the diagonal line length of the effective pixel area on the image plane S15 is 1.87mm, the maximum field angle FOV of the optical imaging system is 204.0 °, the aperture value Fno of the image-capturing lens group is 2.62, and the total effective focal length f of the image-capturing lens group is 1.28 mm. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth in the following table:

TABLE 5

In example 2, the object-side surface and the image-side surface of any one of the second lens E2 to the sixth lens E6 are aspheric surfaces, and table 6 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S3 to S12 in example 2:

TABLE 6

Fig. 2a shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 2, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 2b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 2. Fig. 2c shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2a to 2c, the imaging lens assembly according to embodiment 2 can achieve good imaging quality.

Specific example 3

Fig. 3 is a lens assembly according to embodiment 3, wherein the lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15. Wherein:

As shown in table 7, a basic parameter table of the imaging lens group of embodiment 3 is shown, in which the curvature radius, focal length, thickness/distance unit are all in millimeters (mm):

TABLE 7

As shown in table 8, in embodiment 3, the on-axis distance TTL from the object-side surface S1 of the first lens element E1 to the image plane S15 is 6.40mm, the half ImgH of the diagonal line length of the effective pixel area on the image plane S15 is 1.95mm, the maximum field angle FOV of the optical imaging system is 204.0 °, the aperture value Fno of the image-capturing lens group is 2.62, and the total effective focal length f of the image-capturing lens group is 1.24 mm. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth in the following table:

TABLE 8

In embodiment 3, the object-side surface and the image-side surface of any one of the second lens E2 to the sixth lens E6 are aspheric, and table 9 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S3 to S12 in embodiment 3:

TABLE 9

Fig. 3a shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 3, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 3b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 3. Fig. 3c shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 3a to 3c, the imaging lens assembly of embodiment 3 can achieve good imaging quality.

Specific example 4

Fig. 4 is a lens assembly according to embodiment 4, wherein the lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15. Wherein:

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

As shown in table 10, which is a basic parameter table of the imaging lens group of embodiment 4, wherein the curvature radius, focal length, thickness/distance unit are all in millimeters (mm):

watch 10

As shown in table 11, in embodiment 4, the on-axis distance TTL from the object-side surface S1 of the first lens element E1 to the image plane S15 is 6.40mm, the half ImgH of the diagonal line length of the effective pixel area on the image plane S15 is 2.12mm, the maximum field angle FOV of the optical imaging system is 204.0 °, the aperture value Fno of the image-capturing lens group is 2.62, and the total effective focal length f of the image-capturing lens group is 1.21 mm. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth in the following table:

TABLE 11

In example 4, the object-side surface and the image-side surface of any one of the second lens E2 to the sixth lens E6 are aspheric, and table 12 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S3 to S12 in example 4:

TABLE 12

Fig. 4a shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 4b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 4. Fig. 4c shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4a to 4c, the imaging lens assembly of embodiment 4 can achieve good imaging quality.

Specific example 5

Fig. 5 is a lens assembly according to embodiment 5, wherein the lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15. Wherein:

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

As shown in table 13, which is a basic parameter table of the imaging lens group of embodiment 5, wherein the curvature radius, focal length, thickness/distance unit are all in millimeters (mm):

watch 13

As shown in table 14, in embodiment 5, the on-axis distance TTL from the object-side surface S1 of the first lens element E1 to the image plane S15 is 6.84mm, the half ImgH of the diagonal line length of the effective pixel area on the image plane S15 is 1.81mm, the maximum field angle FOV of the optical imaging system is 210.0 °, the aperture value Fno of the image-capturing lens group is 2.62, and the total effective focal length f of the image-capturing lens group is 0.97 mm. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth in the following table:

TABLE 14

In example 5, the object-side surface and the image-side surface of any one of the first lens element E1 through the sixth lens element E6 are aspheric, and table 15 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 through S12 in example 5:

watch 15

Fig. 5a shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 5, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 5b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 5. Fig. 5c shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 5a to 5c, the imaging lens assembly according to embodiment 5 can achieve good imaging quality.

Specific example 6

Fig. 6 is a lens assembly according to embodiment 6, wherein the lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15. Wherein:

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

As shown in table 16, which is a basic parameter table of the imaging lens group of embodiment 6, wherein the curvature radius, focal length, thickness/distance unit are all in millimeters (mm):

TABLE 16

As shown in table 17, in example 6, the on-axis distance TTL from the object-side surface S1 of the first lens element E1 to the image plane S15 is 7.50mm, the half ImgH of the diagonal line length of the effective pixel area on the image plane S15 is 1.89mm, the maximum field angle FOV of the optical imaging system is 208.0 °, the aperture value Fno of the image-capturing lens group is 2.62, and the total effective focal length f of the image-capturing lens group is 1.01 mm. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth in the following table:

TABLE 17

In example 6, the object-side surface and the image-side surface of any one of the first lens element E1 through the sixth lens element E6 are aspheric, and table 18 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 through S12 in example 6:

watch 18

Fig. 6a shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 6, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 6b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 6. Fig. 6c shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6a to 6c, the imaging lens assembly according to embodiment 6 can achieve good imaging quality.

Specific example 7

Fig. 7 is a lens assembly according to embodiment 7, wherein the lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15. Wherein:

As shown in table 19, is a basic parameter table of the imaging lens group of embodiment 7 in which the curvature radius, focal length, thickness/distance unit are all in millimeters (mm):

watch 19

As shown in table 20, in example 7, the on-axis distance TTL from the object-side surface S1 of the first lens element E1 to the image plane S15 is 6.40mm, the half ImgH of the diagonal line length of the effective pixel area on the image plane S15 is 2.21mm, the maximum field angle FOV of the optical imaging system is 216.0 °, the aperture value Fno of the image-capturing lens group is 2.62, and the total effective focal length f of the image-capturing lens group is 1.21 mm. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth in the following table:

watch 20

In example 7, the object-side surface and the image-side surface of any one of the second lens E1 to the sixth lens E6 are aspheric, and table 21 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S3 to S12 in example 7:

TABLE 21

Fig. 7a shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 7, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 7b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 7. Fig. 7c shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 7a to 7c, the imaging lens assembly according to embodiment 7 can achieve good imaging quality.

The invention has the beneficial effects that:

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, improvements, equivalents and the like that fall within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An image capturing lens assembly, comprising, in order from an object side to an image side along an optical axis:

a first lens having a focal power, an object-side surface of which is convex;

the image side surface of the second lens is a convex surface;

the image side surface of the third lens is a convex surface;

a fourth lens having a negative optical power;

a sixth lens having optical power;

wherein, the distance TTL between the maximum field angle FOV of the camera lens group and the object side surface of the first lens element to the imaging surface of the camera lens group on the optical axis satisfies the following conditions: 5 xtan (FOV-90 degree)/TTL>0.8mm^-1。

2. The imaging lens group of claim 1, wherein the effective focal length f3 of the third lens and the effective focal length f of the imaging lens group satisfy: 1< f3/f <3.

3. The imaging lens group of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens element and the radius of curvature R10 of the image-side surface of the fifth lens element satisfy: -15< R1/R10< -4.

4. The imaging lens group of claim 1, wherein a distance T45 between the fourth lens element and the fifth lens element on the optical axis and a distance T56 between the fifth lens element and the sixth lens element on the optical axis satisfy: T45/T56< 0.5.

5. The imaging lens group of claim 1, wherein a distance T56 between the fifth lens element and the sixth lens element on the optical axis and a distance BFL between an image side surface of the sixth lens element and an image plane of the imaging lens group on the optical axis satisfy: 0.3< T56/BFL < 1.1.

6. The imaging lens group of claim 1, wherein the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: CT2/CT3> 1.3.

7. The imaging lens group according to claim 1, wherein a distance T23 between the second lens element and the third lens element on the optical axis and a distance T12 between the first lens element and the second lens element on the optical axis satisfy: T23/T12< 1.4.

8. The imaging lens group according to claim 1, wherein a distance T23 between the second lens element and the third lens element on the optical axis, a distance T34 between the third lens element and the fourth lens element on the optical axis, a distance T45 between the fourth lens element and the fifth lens element on the optical axis, and a distance Tr3r8 between an object-side surface of the second lens element and an image-side surface of the fourth lens element on the optical axis satisfy: (T23+ T34+ T45)/Tr3r8< 1.5.

9. The imaging lens group of claim 1, wherein the distance TTL between the maximum effective radius DT11 of the object-side surface of the first lens element and the object-side surface of the first lens element to the image plane of the imaging lens group on the optical axis satisfies: 0.4< DT11/TTL < 0.8.

10. An image capturing lens assembly, comprising, in order from an object side to an image side along an optical axis:

a first lens having a focal power, an object-side surface of which is convex;

the image side surface of the second lens is a convex surface;

the image side surface of the third lens is a convex surface;

a fourth lens having a negative optical power;

a sixth lens having optical power;