CN216210161U

CN216210161U - Moving focusing optical lens group

Info

Publication number: CN216210161U
Application number: CN202122515152.3U
Authority: CN
Inventors: 徐胡伟; 张晓彬; 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-04-05
Anticipated expiration: 2031-10-19

Abstract

The utility model provides a moving focusing optical lens group, which sequentially comprises the following components from an object side to an image side of the moving focusing optical lens group: a first lens group having positive power, the first lens group including at least one lens having power; a second lens group including two lenses having power; when the optical lens group focused by the relative movement of the shot object moves from infinite distance to micro distance or when the optical lens group focused by the relative movement of the shot object moves from micro distance to infinite distance, the second lens group moves on the optical axis to realize focusing, the difference quantity delta T of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at a close shooting position and the optical lens group is located at a far shooting position, and the sum sigma CT of the thicknesses of the first lens group to the last lens group on the optical axis respectively in the optical lens group satisfy the following conditions: 0.2< DELTAT/SIGMA CT < 0.9. The utility model solves the problem of high power consumption of the optical lens group in the prior art.

Description

Moving focusing optical lens group

Technical Field

The utility model relates to the technical field of optical imaging equipment, in particular to an optical lens group for moving focusing.

Background

As portable electronic products become thinner and lighter, the sizes of the components inside the products also need to be reduced, especially in the volume of the camera lens module. Generally, the lens is limited by space, and it is difficult to satisfy the requirements of both close-up and far-up photographing.

In addition, in general, a focusing method of an image pickup lens having a focusing function may be implemented by using a software method, such as an extended depth of field technique, which uses a color of an optimal light shape at a current distance as a main axis light and then uses a digital method for achieving a focusing effect; or the voice coil motor is utilized to change the relative distance between the whole camera lens and the image photosensitive element to achieve the focusing effect; however, the above two methods have problems of reduced image quality and excessive power consumption, respectively.

That is, the optical lens group in the prior art has a problem of large power consumption.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an optical lens group for moving focusing, which aims to solve the problem of high power consumption of the optical lens group in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a moving-focus optical lens group comprising, in order from an object side to an image side of the moving-focus optical lens group: a first lens group having positive power, the first lens group including at least one lens having power; a second lens group including two lenses having power; when the optical lens group focused by the relative movement of the shot object moves from infinite distance to micro distance or when the optical lens group focused by the relative movement of the shot object moves from micro distance to infinite distance, the second lens group moves on the optical axis to realize focusing, the difference quantity delta T of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at a close shooting position and the optical lens group is located at a far shooting position, and the sum sigma CT of the thicknesses of the first lens group to the last lens group on the optical axis respectively in the optical lens group satisfy the following conditions: 0.2< DELTAT/SIGMA CT < 0.9.

Further, the second lens group includes a lens having positive power and a lens having negative power.

Furthermore, a lens of the optical lens group close to the object side of the optical lens group is a first lens, the first lens has positive focal power, and an object side surface of the first lens is a convex surface.

Further, a distance Um between the object and an object side surface of the first lens of the optical lens group in the close-up position of the optical lens group satisfies: the diameter is more than or equal to 45mm and less than 60 mm.

Further, the length of half of the diagonal ImgH of the effective pixel area on the imaging surface and the distance TTL on the optical axis from the object side surface of the first lens of the optical lens group to the imaging surface satisfy: 0.1< ImgH/TTL < 0.3.

Further, a half of the Semi-FOvm of the maximum angle of view of the optical lens group at the close-up position and an aperture value fnom of the optical lens group at the close-up position satisfy: 4< TAN (Semi-FOVm) × fnom < 7.

Further, a distance BFLi between a focal length fi of the optical lens group at the telephoto position and a last lens of the optical lens group at the telephoto position to the imaging surface on the optical axis satisfies: 0.3< BFLi/fi <1.

Further, a distance BFLm between the last lens of the optical lens group and the imaging plane on the optical axis in the close-up position satisfies: 0.1< BFLm/fm < 0.8.

Further, a focal length fi of the optical lens group at the telephoto position, a focal length fm of the optical lens group at the close-up position, a distance BFLi from the last lens of the optical lens group at the telephoto position to the imaging surface on the optical axis, and a distance BFLm from the last lens of the optical lens group at the close-up position to the imaging surface on the optical axis satisfy: 0< (BFLi/fi) - (BFLm/fm) < 0.2.

Further, the focal length fi of the optical lens group at the far shooting position and the focal length fm of the optical lens group at the close shooting position satisfy: 1< fi/fm < 1.5.

Further, a distance TDi on the optical axis from the object side surface of the first lens of the optical lens group to the image side surface of the last lens of the optical lens group in the far photographing position, a distance TDm on the optical axis from the object side surface of the first lens of the optical lens group to the image side surface of the last lens of the optical lens group in the close photographing position of the optical lens group, and a half ImgH of a diagonal length of the effective pixel area on the imaging plane satisfy: the absolute value TDi-TDm absolute value/ImgH is more than or equal to 0.5 and less than 1.3.

Further, a focal length fG1 of the first lens group and a focal length f1 of the first lens of the optical lens group satisfy: 0.5< f1/fG1< 2.

Further, a center thickness CT1 of the first lens of the optical lens group on the optical axis and an edge thickness ET1 of the first lens satisfy: 0.4< ET1/CT1< 0.9.

Further, a sum Σ CT of center thicknesses, respectively, of the first lens of the optical lens group to the last lens of the optical lens group on the optical axis and a sum Σ ET of edge thicknesses, respectively, of the first lens of the optical lens group to the last lens of the optical lens group on the optical axis satisfy: 0.7< ∑ ET/Σ CT is less than or equal to 1.

Further, when the optical lens group is in the close-up shooting position and the far-up shooting position, the distance between the object side surface of the first lens of the optical lens group and the imaging surface on the optical axis is unchanged.

According to another aspect of the present invention, there is provided a moving-focus optical lens group comprising, in order from an object side to an image side of the moving-focus optical lens group: a first lens group having positive power, the first lens group including at least one lens having power; a second lens group including two lenses having power; when the optical lens group focused by the relative movement of the object moves from infinite distance to micro distance or when the optical lens group focused by the relative movement of the object moves from micro distance to infinite distance, the second lens group moves on the optical axis to realize focusing, and the sum sigma CT of the central thicknesses of the first lens to the last lens of the optical lens group on the optical axis and the sum sigma ET of the edge thicknesses of the first lens to the last lens of the optical lens group on the optical axis satisfy that: 0.7< ∑ ET/Σ CT is less than or equal to 1.

By applying the technical scheme of the utility model, the focusing optical lens group sequentially comprises a first lens group and a second lens group from the object side to the image side, wherein the first lens group has positive focal power and comprises at least one lens with focal power; the second lens group includes two lenses having power; when the optical lens group focused by the relative movement of the shot object moves from infinite distance to micro distance or when the optical lens group focused by the relative movement of the shot object moves from micro distance to infinite distance, the second lens group moves on the optical axis to realize focusing, the difference quantity delta T of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at a close shooting position and the optical lens group is located at a far shooting position, and the sum sigma CT of the thicknesses of the first lens group to the last lens group on the optical axis respectively in the optical lens group satisfy the following conditions: 0.2< DELTAT/SIGMA CT < 0.9.

Through the reasonable distribution of the focal power of each lens, the aberration generated by the optical lens group is favorably balanced, and the imaging quality of the optical lens group is greatly improved. By controlling the ratio of the stroke of the second lens group to the sum of the central thicknesses of the lenses of the optical lens group, the lens can be guaranteed to be formed in an effective range, and the motor is convenient to select and configure. The miniaturization of the optical lens group is guaranteed, meanwhile, the imaging quality of the optical lens group is guaranteed, and meanwhile, the power consumption is reduced.

Drawings

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

FIG. 1 is a schematic diagram showing the configuration of an optical lens assembly in a telephoto position according to a first example of the present invention;

FIG. 2 is a schematic diagram showing the structure of an optical lens assembly in a close-up position according to a first example of the present invention;

fig. 3 to 6 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve of the zoom lens in fig. 1, respectively;

fig. 7 to 10 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve of the zoom lens in fig. 2, respectively;

FIG. 11 is a schematic diagram showing a configuration of an optical lens group of example two of the present invention in a telephoto position;

FIG. 12 is a schematic view showing a configuration of an optical lens group of example two of the present invention in a close-up photographing position;

fig. 13 to 16 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve of the zoom lens in fig. 11, respectively;

fig. 17 to 20 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the zoom lens in fig. 12;

FIG. 21 is a schematic diagram showing the configuration of an optical lens group of example three of the present invention in a telephoto position;

FIG. 22 is a schematic view showing the configuration of an optical lens group of example three of the present invention in a close-up position;

fig. 23 to 26 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the zoom lens in fig. 21;

fig. 27 to 30 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the zoom lens in fig. 22;

FIG. 31 is a schematic view showing the configuration of an optical lens group of example four of the present invention in a telephoto position;

FIG. 32 is a schematic view showing the structure of an optical lens group of example four of the present invention in a close-up position;

FIGS. 33 to 36 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the zoom lens in FIG. 31;

fig. 37 to 40 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the zoom lens in fig. 32;

FIG. 41 is a schematic diagram showing the configuration of an optical lens group of example five of the present invention in a telephoto position;

FIG. 42 is a schematic view showing the structure of an optical lens group of example five of the present invention in a close-up position;

fig. 43 to 46 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the zoom lens in fig. 41;

fig. 47 to 50 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the zoom lens in fig. 42;

FIG. 51 is a schematic diagram showing the configuration of an optical lens group of example six of the present invention in a telephoto position;

FIG. 52 is a schematic view showing the structure of an optical lens group of example six of the present invention in a close-up position;

FIGS. 53 to 56 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the zoom lens in FIG. 51;

fig. 57 to 60 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the zoom lens in fig. 52.

Wherein the figures include the following reference numerals:

g1, a first lens group; g2, second lens group; STO, stop; e1, first lens; s1, the object side surface of the first lens; s2, an image side surface of the first lens; e2, second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; e5, fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of the fifth lens element; e6, sixth lens; s11, the object-side surface of the sixth lens element; s12, an image side surface of the sixth lens element; e7, seventh lens; s13, an object-side surface of the seventh lens; s14, an image side surface of the seventh lens element; e8, eighth lens; s15, an object-side surface of the eighth lens element; s16, an image side surface of the eighth lens element; e9, optical filters; s17, the object side surface of the optical filter; s18, the image side surface of the optical filter; and S19, imaging surface.

Detailed Description

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

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

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

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

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

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

In order to solve the problem of high power consumption of an optical lens group in the prior art, the utility model provides an optical lens group for moving focusing.

As shown in fig. 1 to 60, the focusing optical lens group includes, in order from an object side to an image side, a first lens group having positive power and a second lens group including at least one lens having power; the second lens group includes two lenses having power; when the optical lens group focused by the relative movement of the shot object moves from infinite distance to micro distance or when the optical lens group focused by the relative movement of the shot object moves from micro distance to infinite distance, the second lens group moves on the optical axis to realize focusing, the difference quantity delta T of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at a close shooting position and the optical lens group is located at a far shooting position, and the sum sigma CT of the thicknesses of the first lens group to the last lens group on the optical axis respectively in the optical lens group satisfy the following conditions: 0.2< DELTAT/SIGMA CT < 0.9.

Preferably, a difference amount Δ T between intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at the close-up position and when the optical lens group is located at the far-up position, and a sum Σ CT of thicknesses of the first lens to the last lens in the optical lens group on the optical axis, respectively, satisfy: 0.2< DELTAT/SIGMA CT < 0.8.

When the optical lens group for the relative movement focusing of the object moves from infinity to macro or when the optical lens group for the relative movement focusing of the object moves from macro to infinity, the second lens group moves on the optical axis to realize focusing, and when the object approaches or leaves the optical lens group, the motor drives the second lens group to move to change the distance between the first lens group and the second lens group so as to realize automatic focusing.

The far-field position refers to a shooting scene in which the subject is at infinity, and the near-field position refers to a shooting scene in which the subject is at macro.

In the present embodiment, the second lens group includes one lens having positive power and one lens having negative power. The height of the second lens group is greatly limited, wherein the second lens group is beneficial to reducing the height of the lens group by adopting a lens combination mode of positive and negative focal power, and the problem that the height of the lens group is met by cutting too many effective diameters of the lenses due to overlarge lens calibers is avoided, so that the imaging quality of the optical lens group is ensured.

In this embodiment, a lens of the optical lens assembly near the object side of the optical lens assembly is a first lens, the first lens has positive power, and an object-side surface of the first lens is a convex surface. The first lens has positive focal power, and the object side surface of the first lens is a convex surface, so that the light entering amount can be increased, light beams can be converged, the illumination of an inner view field can be favorably improved, the distortion is reduced, and the performance of the whole system is improved.

In this embodiment, a distance Um between a subject and an object side surface of a first lens of the optical lens group in the close-up position of the optical lens group satisfies: the diameter is more than or equal to 45mm and less than 60 mm. The minimum object distance in the close-up shooting position is reasonably controlled, optimization and performance improvement of a previous system are facilitated, and if the object distance in the close-up shooting position is too small, imaging difficulty is high, and design and processing are difficult to meet requirements. Preferably 45 mm. ltoreq. Um <58 mm.

In this embodiment, ImgH, which is half the diagonal length of the effective pixel region on the imaging surface, and TTL, which is the distance on the optical axis from the object side surface of the first lens of the optical lens group to the imaging surface, satisfy: 0.1< ImgH/TTL < 0.3. The ImgH/TTL is guaranteed to be within a reasonable range, the miniaturization of the optical system can be guaranteed, and the small structure is beneficial to the design and installation of electronic products such as mobile phones. Preferably, 0.10< ImgH/TTL < 0.3.

In the present embodiment, a half of the maximum field angle Semi-FOVm of the optical lens group at the close-up position and the aperture value fnom of the optical lens group at the close-up position satisfy: 4< TAN (Semi-FOVm) × fnom < 7. By limiting TAN (Semi-FOvm) × fnom within a reasonable range, the optical imaging lens group has excellent imaging quality in a close-up shooting position through reasonable matching of the aperture value and the maximum half field angle of the lens in the close-up shooting position, and the miniaturization of the optical imaging lens group can also be ensured. Preferably, 4< TAN (Semi-FOVm) × fnom < 6.9.

In this embodiment, a distance BFLi between a focal length fi of the optical lens group at the telephoto position and a last lens of the optical lens group at the telephoto position to the imaging surface on the optical axis satisfies: 0.3< BFLi/fi <1. By limiting BFLi/fi within a reasonable range, the telephoto characteristic of the optical lens assembly can be ensured, and the optical lens assembly is beneficial to improving the illumination and reducing the distortion of the optical lens assembly. Preferably, 0.3< BFLi/fi < 0.95.

In this embodiment, a distance BFLm between the last lens of the optical lens group and the imaging plane in the optical axis in the close-up position satisfies: 0.1< BFLm/fm < 0.8. Through with BFLm/fm control at reasonable within range, there is great benefit to the promotion of optical lens group formation of image quality when close-up takes a photograph the position, has effectively reduced the distortion, is favorable to light to converge on the imaging surface. Preferably, 0.12< BFLm/fm < 0.8.

In this embodiment, a focal length fi of the optical lens group in the telephoto position, a focal length fm of the optical lens group in the close-up position, a distance BFLi from the last lens of the optical lens group to the imaging surface on the optical axis in the telephoto position, and a distance BFLm from the last lens of the optical lens group to the imaging surface on the optical axis in the close-up position satisfy: 0< (BFLi/fi) - (BFLm/fm) < 0.2. By limiting (BFLi/fi) - (BFLm/fm) to a reasonable range, the moving stroke of the second lens group is considered to ensure that the lens has better resolving power without using a focal length. Preferably, 0.1< (BFLi/fi) - (BFLm/fm) < 0.19.

In this embodiment, a focal length fi of the optical lens group at the telephoto position and a focal length fm of the optical lens group at the close-up position satisfy: 1< fi/fm < 1.5. Through restricting fi/fm in reasonable within range, the aspect has considered current processing procedure ability and module volume requirement, ensures that different focal length homoenergetic can possess better resolving power, and the furthest adapts to various different shooting scenes on the other hand, no matter near or object far away, through optical zoom, obtains harmless picture quality, can obtain the promotion of matter on comparing current digital zoom picture quality. Preferably, 1< fi/fm < 1.4.

In this embodiment, a distance TDi on the optical axis from the object side surface of the first lens of the optical lens group to the image side surface of the last lens of the optical lens group in the telephoto position, a distance TDm on the optical axis from the object side surface of the first lens of the optical lens group to the image side surface of the last lens of the optical lens group in the close-up position of the optical lens group, and a half ImgH of a diagonal length of the effective pixel area on the imaging plane satisfy: the absolute value TDi-TDm absolute value/ImgH is more than or equal to 0.5 and less than 1.3. Through restricting | TDi-TDm |/ImgH in reasonable within range, can ensure at the effective length of long shoot position and close shot position optical lens group, to the processing of module with be equipped with certain guide effect, no matter be long shoot or close shoot can both obtain clear image on the high image plane of effective image. Preferably, 0.5. ltoreq. TDi-TDm/ImgH < 1.28.

In the present embodiment, a focal length fG1 of the first lens group and a focal length f1 of the first lens of the optical lens group satisfy: 0.5< f1/fG1< 2. Through restricting f1/fG1 in reasonable scope, can be favorable to controlling the bore of whole lens on the one hand, avoid the lens side cut proportion too big, on the other hand rationally distribute the focal value, avoid the focal power too concentrated, cause the optical sensitivity of a certain group too big, have very big challenge to the processing procedure ability, lead to whole yield on the low manufacturing cost greatly increased. Preferably, 0.55< f1/fG1< 1.9.

In the present embodiment, the central thickness CT1 of the first lens of the optical lens group on the optical axis and the edge thickness ET1 of the first lens satisfy: 0.4< ET1/CT1< 0.9. By limiting ET1/CT1 within a reasonable range, the processing technology of the lens can be effectively improved, and the lens is convenient to form and assemble at the later stage. Preferably 0.5< ET1/CT1< 0.85.

In this embodiment, a sum Σ CT of center thicknesses, respectively, of the first lens of the optical lens group to the last lens of the optical lens group on the optical axis and a sum Σ ET of edge thicknesses, respectively, of the first lens of the optical lens group to the last lens of the optical lens group on the optical axis satisfy: 0.7< ∑ ET/Σ CT is less than or equal to 1. By limiting the sigma ET/sigma CT within a reasonable range, the lens surface shape can be normal, which is not only beneficial to the processing and forming of the lens, but also beneficial to the structural design and production line assembly process of the lens cone and the spacer. Preferably, 0.75< ∑ ET/Σ CT ≦ 1.

In this embodiment, when the optical lens group is in the close-up position and the far-out position, the distance from the object-side surface of the first lens of the optical lens group to the imaging surface on the optical axis is not changed. The arrangement ensures that the unfavorable condition of installation can not occur when the optical lens group is assembled in the module, and the movement of the second lens group can not interfere with the module end when the long-shot position and the close-shot position are ensured.

Example two

As shown in fig. 1 to 60, the focusing optical lens group includes, in order from an object side to an image side, a first lens group having positive power and a second lens group including at least one lens having power; the second lens group includes two lenses having power; when the optical lens group focused by the relative movement of the object moves from infinite distance to micro distance or when the optical lens group focused by the relative movement of the object moves from micro distance to infinite distance, the second lens group moves on the optical axis to realize focusing, and the sum sigma CT of the central thicknesses of the first lens to the last lens of the optical lens group on the optical axis and the sum sigma ET of the edge thicknesses of the first lens to the last lens of the optical lens group on the optical axis satisfy that: 0.7< ∑ ET/Σ CT is less than or equal to 1.

Through the reasonable distribution of the focal power of each lens, the aberration generated by the optical lens group is favorably balanced, and the imaging quality of the optical lens group is greatly improved. By limiting the sigma ET/sigma CT within a reasonable range, the lens surface shape can be normal, which is not only beneficial to the processing and forming of the lens, but also beneficial to the structural design and production line assembly process of the lens cone and the spacer. In addition, the forming and debugging process has larger space, and the stray light risk caused by appearance problems of the lens is avoided.

Preferably, a sum Σ CT of center thicknesses, respectively, of the first lens of the optical lens group to the last lens of the optical lens group on the optical axis and a sum Σ ET of edge thicknesses, respectively, of the first lens of the optical lens group to the last lens of the optical lens group on the optical axis satisfy: 0.75< ∑ ET/Σ CT is less than or equal to 1.

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

The optical lens group in the present application may employ a plurality of lenses. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the optical 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 has large aperture and large angle of view. The advantages of ultra-thin and good imaging quality 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 is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical lens group may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. The optical lens group may also include other numbers of lenses, as desired.

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

As shown in fig. 1 to 10, an optical lens group of the first example of the present application is described. Fig. 1 shows a schematic configuration diagram of an optical lens group of a first example in a telephoto position, and fig. 2 shows a schematic configuration diagram of an optical lens group of a first example in a close-up position.

As shown in fig. 1 and fig. 2, the optical lens assembly, in order from an object side to an image side, comprises: a first lens group G1, a second lens group G2, a filter E9, and an image plane S19. Wherein the first lens group G1 includes a stop STO and a first lens E1; the second lens group G2 includes a second lens E2 and a third lens E3;

the first lens group G1 has positive focal power, the second lens group G2 has negative focal power, the first lens E1 has positive focal power, the object-side surface S1 of the first lens is a convex surface, and the image-side surface S2 of the first lens is a convex surface; the second lens E2 has optical power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex; the third lens E3 has optical power, the object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a convex surface; the filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S6, S17, and S18 and is finally imaged on the imaging surface S19.

Table 1 shows a basic structural parameter table of the optical lens group of example one, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm), the left column infinity in the thickness column is that the optical lens group is located at the telephoto position, and the right column 50mm in the thickness column is that the optical lens group is located at the close-up position, and the distance between the subject and the optical lens group is 50 mm.

TABLE 1

In example one, the object-side surface and the image-side surface of any one of the first lens element E1 through the third lens element E3 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient coefficients A4, A6, A8, A10, A12, A14, A16 that can be used for each of the aspherical mirrors S1-S6 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.5295E-02

-2.7126E-02

5.1636E-02

-8.1182E-02

6.9439E-02

-3.1348E-02

5.6549E-03

S2

-2.3252E-03

-2.9075E-02

4.7244E-02

-4.5345E-02

2.4877E-02

-7.3291E-03

8.8929E-04

S3

6.3020E-02

-9.0545E-02

1.5666E-01

-1.5335E-01

8.2360E-02

-2.1830E-02

2.1626E-03

S4

1.1263E-01

-8.5254E-02

8.6790E-02

-5.8022E-02

1.8896E-02

-5.1743E-04

-6.4550E-04

S5

1.8162E-01

-1.6385E-01

1.7011E-01

-1.4091E-01

8.2860E-02

-2.7639E-02

3.8326E-03

S6

5.6773E-02

-3.6547E-02

3.7949E-02

-3.2316E-02

1.8950E-02

-6.0099E-03

7.7735E-04

TABLE 2

Fig. 3 shows an on-axis chromatic aberration curve of the optical lens group of example one at a telephoto position, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4 shows a chromatic aberration of magnification curve at a telephoto position of the optical lens group of the first example, which represents a deviation of different image heights on an image forming surface after light passes through the lens. Fig. 5 shows astigmatism curves of the optical lens group of the first example at the telephoto position, which represent meridional field curvature and sagittal field curvature. Fig. 6 shows distortion curves of the optical lens group of the first example at the telephoto position, which represent values of distortion magnitudes corresponding to different angles of view.

Fig. 7 shows an on-axis chromatic aberration curve of the optical lens group of example one at a close-up position, which indicates that light rays of different wavelengths deviate from a convergent focus after passing through the lens. Fig. 8 shows a chromatic aberration of magnification curve at a close-up position of the optical lens group of the first example, which shows a deviation of different image heights on an image forming surface after light passes through the lens. Fig. 9 shows astigmatism curves of the optical lens group of the first example at the close-up position, which represent meridional field curvature and sagittal field curvature. Fig. 10 shows distortion curves of the optical lens group of the first example at a close-up position, which indicate values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 3 to 10, the optical lens assembly of the first example can achieve good imaging quality.

Example two

As shown in fig. 11 to 20, an optical lens group of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 11 shows a schematic configuration diagram of the optical lens group of the second example in the telephoto position, and fig. 12 shows a schematic configuration diagram of the optical lens group of the second example in the close-up position.

As shown in fig. 11 and 12, the optical lens assembly, in order from an object side to an image side, comprises: a first lens group G1, a second lens group G2, a filter E9, and an image plane S19. Wherein the first lens group G1 includes a stop STO, a first lens E1, and a second lens E2; the second lens group G2 includes a third lens E3 and a fourth lens E4.

The first lens group G1 has positive focal power, the second lens group G2 has negative focal power, the first lens E1 has positive focal power, the object-side surface S1 of the first lens is a convex surface, and the image-side surface S2 of the first lens is a convex surface; the second lens E2 has optical power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex; the third lens E3 has optical power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens E4 has optical power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave; the filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S8, S17, and S18 and is finally imaged on the imaging surface S19.

Table 3 shows a basic structural parameter table of the optical lens group of example two, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm), infinity is a position where the optical lens group is in a telephoto position in the left column of the thickness column, 50mm is a position where the optical lens group is in a close-up position in the right column of the thickness column, and the distance between the subject and the optical lens group is 50 mm.

TABLE 3

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

Flour mark	A4	A6	A8	A10	A12
						S1	1.1140E-02	-3.3940E-03	-5.9916E-04	-2.9365E-03	9.8927E-04
S2	-9.1467E-03	1.0098E-01	-1.3125E-01	8.1426E-02	-2.9315E-02
						S3	2.9196E-02	1.2687E-01	-1.9732E-01	1.6220E-01	-7.7635E-02
S4	7.6411E-02	2.2904E-02	2.5773E-02	-1.0152E-01	1.5688E-01
						S5	3.6189E-02	-5.7708E-02	1.1672E-01	-1.2178E-01	6.0774E-02
S6	7.6568E-02	-2.2765E-01	3.7769E-01	-3.8230E-01	2.5029E-01
						S7	-1.2537E-02	-1.5850E-01	1.2541E-01	3.2867E-03	-1.3666E-01
S8	-2.8221E-02	-6.3581E-02	3.2373E-02	3.7108E-02	-8.0641E-02
						Flour mark	A14	A16	A18	A20	A22
S1	-6.3228E-04	3.2367E-05	0.0000E+00	0.0000E+00	0.0000E+00
						S2	5.5403E-03	-3.8068E-04	0.0000E+00	0.0000E+00	0.0000E+00
S3	1.9964E-02	-2.1047E-03	0.0000E+00	0.0000E+00	0.0000E+00
						S4	-1.0225E-01	2.3134E-02	0.0000E+00	0.0000E+00	0.0000E+00
S5	-1.2284E-02	-6.8811E-05	2.2818E-04	0.0000E+00	0.0000E+00
						S6	-1.0878E-01	3.1105E-02	-5.5953E-03	5.7119E-04	-2.5144E-05
S7	1.2930E-01	-3.9823E-02	0.0000E+00	0.0000E+00	0.0000E+00
						S8	5.8782E-02	-1.9678E-02	2.5330E-03	0.0000E+00	0.0000E+00

TABLE 4

Fig. 13 shows an on-axis chromatic aberration curve at the telephoto position of the optical lens group of example two, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 14 shows a chromatic aberration of magnification curve at the telephoto position of the optical lens group of example two, which represents a deviation of different image heights on the image plane after light passes through the lens. Fig. 15 shows astigmatism curves of the optical lens group of example two at the telephoto position, which represent meridional field curvature and sagittal field curvature. Fig. 16 shows distortion curves of the optical lens group of example two at the telephoto position, which represent values of distortion magnitudes corresponding to different angles of view.

Fig. 17 shows an on-axis chromatic aberration curve in the close-up position of the optical lens group of example two, which indicates that the converging focal points of light rays of different wavelengths are deviated after passing through the lens. Fig. 18 shows a chromatic aberration of magnification curve at the close-up position of the optical lens group of example two, which shows the deviation of different image heights on the image forming surface after the light passes through the lens. Fig. 19 shows astigmatism curves of the optical lens group of example two at the close-up position, which represent meridional field curvature and sagittal field curvature. Fig. 20 shows distortion curves of the optical lens group of example two at a close-up position, which show values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 13 to 20, the optical lens group of example two can achieve good imaging quality.

Example III

As shown in fig. 21 to 30, an optical lens group of example three of the present application is described. Fig. 21 shows a schematic configuration diagram of an optical lens group of example three in a telephoto position, and fig. 22 shows a schematic configuration diagram of an optical lens group of example three in a close-up position.

As shown in fig. 21 and 22, the optical lens assembly, in order from an object side to an image side, comprises: a first lens group G1, a second lens group G2, a filter E9, and an image plane S19. Wherein the first lens group G1 includes a first lens E1, a second lens E2, a stop STO, and a third lens E3; the second lens group G2 includes a fourth lens E4 and a fifth lens E5.

The first lens group G1 has positive focal power, the second lens group G2 has negative focal power, the first lens E1 has positive focal power, the object-side surface S1 of the first lens is a convex surface, and the image-side surface S2 of the first lens is a convex surface; the second lens E2 has optical power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave; the third lens E3 has optical power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex; the fourth lens E4 has optical power, the object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a concave surface; the fifth lens E5 has optical power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave; the filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S10, S17, and S18 and is finally imaged on the imaging surface S19.

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, and the focal length are all millimeters (mm), the left column infinity in the thickness column is that the optical lens group is in the telephoto position, and the right column 20mm in the thickness column is that the optical lens group is in the close-up position, and the distance between the subject and the optical lens group is 20 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. 23 shows an on-axis chromatic aberration curve at the telephoto position of the optical lens group of example three, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 24 shows a chromatic aberration of magnification curve at the telephoto position of the optical lens group of example three, which represents a deviation of different image heights on the image plane after light passes through the lens. Fig. 25 shows astigmatism curves of the optical lens group of example three at the telephoto position, which represent meridional field curvature and sagittal field curvature. Fig. 26 shows distortion curves of the optical lens group of example three at the telephoto position, which represent values of distortion magnitudes corresponding to different angles of view.

Fig. 27 shows an on-axis chromatic aberration curve in the close-up position of the optical lens group of example three, which indicates that the converging focal points of light rays of different wavelengths after passing through the lens deviate. Fig. 28 shows a chromatic aberration of magnification curve at the close-up position of the optical lens group of example three, which shows the deviation of different image heights on the image forming surface after the light passes through the lens. Fig. 29 shows astigmatism curves of the optical lens group of example three at a close-up position, which represent meridional field curvature and sagittal field curvature. Fig. 30 shows distortion curves of the optical lens group of example three at a close-up position, which represent values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 23 to 30, the optical lens group given in example three can achieve good imaging quality.

Example four

As shown in fig. 31 to 40, an optical lens group of example four of the present application is described. Fig. 31 shows a schematic configuration diagram of an optical lens group of example four in a telephoto position, and fig. 32 shows a schematic configuration diagram of an optical lens group of example four in a close-up position.

As shown in fig. 31 and 32, the optical lens assembly, in order from an object side to an image side, comprises: a first lens group G1, a second lens group G2, a filter E9, and an image plane S19. Wherein the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4; the second lens group G2 includes a fifth lens E5 and a sixth lens E6.

The first lens group G1 has positive focal power, the second lens group G2 has negative focal power, the first lens E1 has positive focal power, the object-side surface S1 of the first lens is a convex surface, and the image-side surface S2 of the first lens is a convex surface; the second lens E2 has optical power, the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface; the third lens E3 has optical power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens E4 has optical power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave; the fifth lens E5 has optical power, the object side surface S9 of the fifth lens is a concave surface, and the image side surface S10 of the fifth lens is a concave surface; the sixth lens element E6 has optical power, and the object-side surface S11 of the sixth lens element is convex, and the image-side surface S12 of the sixth lens element is concave; the filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S12, S17, and S18 and is finally imaged on the imaging surface S19.

Table 7 shows a basic structural parameter table of the optical lens group of example four, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm), the left column infinity in the thickness column is that the optical lens group is in the telephoto position, and the right column 50mm in the thickness column is that the optical lens group is in the close-up position, and the distance between the subject and the optical lens group is 50 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. 33 shows an on-axis chromatic aberration curve at the telephoto position of the optical lens group of example four, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 34 shows a chromatic aberration of magnification curve at the telephoto position of the optical lens group of example four, which represents a deviation of different image heights on the image plane after light passes through the lens. Fig. 35 shows astigmatism curves of the optical lens group of example four at the telephoto position, which represent meridional field curvature and sagittal field curvature. Fig. 36 shows distortion curves of the optical lens group of example four at the telephoto position, which represent distortion magnitude values corresponding to different angles of view.

Fig. 37 shows an on-axis chromatic aberration curve in the close-up position of the optical lens group of example four, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 38 shows a chromatic aberration of magnification curve at the close-up position of the optical lens group of example four, which represents a deviation of different image heights on the image plane after light passes through the lens. Fig. 39 shows astigmatism curves of the optical lens group of example four at a close-up position, which represent meridional field curvature and sagittal field curvature. Fig. 40 shows distortion curves of the optical lens group of example four at a close-up position, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 33 to 40, the optical lens group given in example four can achieve good imaging quality.

Example five

As shown in fig. 41 to 50, an optical lens group of example five of the present application is described. Fig. 41 shows a schematic configuration diagram of an optical lens group of example five in a telephoto position, and fig. 42 shows a schematic configuration diagram of an optical lens group of example five in a close-up position.

As shown in fig. 41 and 42, the optical lens assembly, in order from an object side to an image side, comprises: a first lens group G1, a second lens group G2, a filter E9, and an image plane S19. Wherein the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5; the second lens group G2 includes a sixth lens E6 and a seventh lens E7.

The first lens group G1 has positive focal power, the second lens group G2 has negative focal power, the first lens E1 has positive focal power, the object-side surface S1 of the first lens is a convex surface, and the image-side surface S2 of the first lens is a convex surface; the second lens E2 has optical power, the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface; the third lens E3 has optical power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens E4 has optical power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave; the fifth lens E5 has optical power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave; the sixth lens element E6 has optical power, and the object-side surface S11 of the sixth lens element is concave, and the image-side surface S12 of the sixth lens element is convex; the seventh lens E7 has optical power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave; the filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S14, S17, and S18 and is finally imaged on the imaging surface S19.

Table 9 shows a basic structural parameter table of the optical lens groups of example five, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm), the left column infinity in the thickness column is that the optical lens group is in the telephoto position, and the right column 50mm in the thickness column is that the optical lens group is in the close-up position, and the distance between the subject and the optical lens group is 50 mm.

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-7.7537E-03

-3.1738E-03

-9.5571E-03

3.7784E-02

-6.2209E-02

4.9336E-02

-1.5227E-02

S2

7.7050E-03

-1.1360E-01

5.2352E-01

-1.3249E+00

1.8342E+00

-1.2863E+00

3.5391E-01

S3

2.8207E-02

-1.2767E-01

7.0512E-01

-2.1746E+00

3.6523E+00

-3.3014E+00

1.4567E+00

S4

1.6701E-02

2.6186E-02

-1.9414E-01

1.9073E-01

4.3179E-01

-1.0789E+00

6.5656E-01

S5

6.7434E-03

3.8548E-02

-2.2348E-01

-2.2377E-02

1.9793E+00

-4.0915E+00

2.5613E+00

S6

-7.7696E-02

8.5952E-02

1.6371E+00

-9.8520E+00

2.5191E+01

-3.1484E+01

1.5571E+01

S7

-9.9911E-02

1.2795E-01

2.0498E+00

-1.1948E+01

2.9345E+01

-3.4919E+01

1.6369E+01

S8

4.0549E-02

-1.9760E-01

2.1507E+00

-1.0894E+01

2.8636E+01

-3.7397E+01

1.9196E+01

S9

1.1725E-01

-2.9807E-01

1.1129E+00

-4.2743E+00

1.0960E+01

-1.5196E+01

8.5271E+00

S10

1.1337E-01

-9.0160E-02

-3.2310E-01

3.2822E+00

-1.2008E+01

2.2681E+01

-2.2510E+01

S11

2.6723E-01

6.9603E-01

-1.2417E+01

1.2735E+02

-9.5856E+02

5.2896E+03

-2.1416E+04

S12

1.9012E-01

8.6592E-01

-6.8526E+00

3.7210E+01

-1.4952E+02

4.3167E+02

-8.6155E+02

S13

-2.1784E-01

4.6608E-01

-1.7814E+00

5.5826E+00

-1.2545E+01

1.9271E+01

-1.8712E+01

S14

-2.1103E-01

2.0364E-01

-4.0722E-01

6.8765E-01

-8.9943E-01

9.8231E-01

-7.7475E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

0.0000E+00

S3

-2.3096E-01

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

0.0000E+00

S8

0.0000E+00

S9

0.0000E+00

S10

9.7848E+00

0.0000E+00

S11

6.3722E+04

-1.3878E+05

2.1809E+05

-2.4020E+05

1.7552E+05

-7.6279E+04

1.4895E+04

S12

1.1443E+03

-9.6205E+02

4.6507E+02

-9.9321E+01

0.0000E+00

S13

1.0008E+01

-2.1945E+00

0.0000E+00

S14

2.6711E-01

0.0000E+00

Watch 10

Fig. 43 shows an on-axis chromatic aberration curve at the telephoto position of the optical lens group of example five, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 44 shows a chromatic aberration of magnification curve at the telephoto position of the optical lens group of example five, which represents a deviation of different image heights on the image plane after light passes through the lens. Fig. 45 shows astigmatism curves of the optical lens group of example five at the telephoto position, which represent meridional field curvature and sagittal field curvature. Fig. 46 shows distortion curves of the optical lens group of example five at the telephoto position, which represent distortion magnitude values corresponding to different angles of view.

Fig. 47 shows an on-axis chromatic aberration curve in a close-up position of the optical lens group of example five, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 48 shows a chromatic aberration of magnification curve at the close-up position of the optical lens group of example five, which represents the deviation of different image heights on the image plane after light passes through the lens. Fig. 49 shows astigmatism curves of the optical lens group of example five at a close-up position, which represent meridional field curvature and sagittal field curvature. Fig. 50 shows distortion curves of the optical lens group of example five at a close-up position, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 43 to 50, the optical lens group given in example five can achieve good imaging quality.

Example six

As shown in fig. 51 to 60, an optical lens group of example six of the present application is described. Fig. 51 shows a schematic configuration diagram of an optical lens group of example six in a telephoto position, and fig. 52 shows a schematic configuration diagram of an optical lens group of example six in a close-up position.

As shown in fig. 51 and 52, the optical lens assembly, in order from an object side to an image side, comprises: a first lens group G1, a second lens group G2, a filter E9, and an image plane S19. Wherein the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6; the second lens group G2 includes a seventh lens E7 and an eighth lens E8.

The first lens group G1 has positive focal power, the second lens group G2 has negative focal power, the first lens E1 has positive focal power, the object-side surface S1 of the first lens is a convex surface, and the image-side surface S2 of the first lens is a concave surface; the second lens E2 has optical power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave; the third lens E3 has optical power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens E4 has optical power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave; the fifth lens E5 has optical power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave; the sixth lens element E6 has optical power, and the object-side surface S11 of the sixth lens element is convex, and the image-side surface S12 of the sixth lens element is concave; the seventh lens E7 has optical power, the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave; the eighth lens element E8 has optical power, and the object-side surface S15 of the eighth lens element is convex, and the image-side surface S16 of the eighth lens element is concave; the filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

Table 11 shows a basic structural parameter table of the optical lens groups of example six, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm), the left column infinity in the thickness column is that the optical lens group is in the telephoto position, and the right column 50mm in the thickness column is that the optical lens group is in the close-up position, and the distance between the subject and the optical lens group is 50 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. 53 shows an on-axis chromatic aberration curve at the telephoto position of the optical lens group of example six, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 54 shows a chromatic aberration of magnification curve at the telephoto position for the optical lens group of example six, which represents a deviation of different image heights on the image plane after light passes through the lens. Fig. 55 shows astigmatism curves of the optical lens group of example six at the telephoto position, which represent meridional field curvature and sagittal field curvature. Fig. 56 shows distortion curves at the telephoto position for the optical lens group of example six, which represent values of distortion magnitudes for different angles of view.

Fig. 57 shows an on-axis chromatic aberration curve in a close-up position of the optical lens group of example six, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 58 shows a chromatic aberration of magnification curve at the close-up position of the optical lens group of example six, which represents a deviation of different image heights on the image plane after light passes through the lens. Fig. 59 shows astigmatism curves of the optical lens group of example six at the close-up position, which represent meridional field curvature and sagittal field curvature. Fig. 60 shows distortion curves at the close-up position of the optical lens group of example six, which represent values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 53 to 60, the optical lens group given in 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
							△T/∑CT	0.31	0.37	0.21	0.33	0.29	0.47
ImgH/TTL	0.19	0.18	0.19	0.15	0.18	0.29
							TAN(Semi-FOVm)*fnom	5.60	4.75	4.16	5.02	4.78	6.81
BFLi/fi	0.90	0.37	0.51	0.33	0.31	0.33
							BFLm/fm	0.79	0.19	0.42	0.14	0.17	0.18
(BFLi/fi)-(BFLm/fm)	0.11	0.18	0.15	0.18	0.14	0.15
							fi/fm	1.03	1.24	1.23	1.31	1.24	1.23
\|TDi-TDm\|/ImgH	0.50	1.14	1.09	1.26	0.88	0.60
							f1/fG1	1.00	0.59	0.78	0.96	0.95	1.80
ET1/CT1	0.82	0.65	0.67	0.73	0.75	0.65
							∑ET/∑CT	0.92	0.95	0.80	0.95	0.96	1.00

Watch 13

Table 14 gives effective focal lengths f of the optical lens groups of example one to example six.

TABLE 14

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens group described above.

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

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

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

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

Claims

1. A focusing optical lens assembly, comprising, in order from an object side to an image side:

a first lens group having positive optical power, the first lens group including at least one lens having optical power;

a second lens group including two lenses having power;

wherein the second lens group moves on the optical axis to achieve focusing when the subject moves from infinity to macro with respect to the optical lens group for moving focusing or when the subject moves from macro to infinity with respect to the optical lens group for moving focusing,

the difference quantity DeltaT between the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at a close shooting position and the optical lens group is located at a far shooting position, and the sum Sigma CT of the thicknesses of the first lens to the last lens in the optical lens group on the optical axis respectively satisfy the following conditions: 0.2< DELTAT/SIGMA CT < 0.9.

2. A mobile focus optical lens group as claimed in claim 1, wherein said second lens group comprises one lens with positive power and one lens with negative power.

3. The mobile focusing optical lens assembly of claim 1, wherein a lens of the optical lens assembly near the object side of the optical lens assembly is a first lens having positive power, and wherein an object side surface of the first lens is a convex surface.

4. A moving-focus optical lens group according to claim 1, wherein the distance Um between the object and the object-side surface of the first lens of said optical lens group in said close-up position of said optical lens group satisfies: the diameter is more than or equal to 45mm and less than 60 mm.

5. A moving focus optical lens assembly as claimed in claim 1, wherein ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of said optical lens assembly, and TTL, which is the distance on the optical axis from the object side surface of the first lens of said optical lens assembly to said imaging surface, satisfy: 0.1< ImgH/TTL < 0.3.

6. A moving-focus optical lens group according to claim 1, wherein the half Semi-FOVm of the maximum field angle of said optical lens group at said close-up position and the aperture value fnom of said optical lens group at said close-up position satisfy: 4< TAN (Semi-FOVm) × fnom < 7.

7. A mobile focusing optical lens group according to claim 1, wherein the focal length fi of said optical lens group in said telephoto position and the distance BFLi on said optical axis from the last lens of said optical lens group to the imaging surface of said optical lens group in said telephoto position satisfy: 0.3< BFLi/fi <1.

8. A mobile focusing optical lens group according to claim 1, wherein the focal length fm of said optical lens group in said close-up position and the distance BFLm of the last lens of said optical lens group to the imaging surface of said optical lens group on said optical axis when said optical lens group is in said close-up position satisfy: 0.1< BFLm/fm < 0.8.

9. A mobile focusing optical lens group according to claim 1, wherein the focal length fi of said optical lens group in said telephoto position, the focal length fm of said optical lens group in said close-up position, the distance BFLi of the last lens of said optical lens group to the imaging surface of said optical lens group on said optical axis in said telephoto position, and the distance BFLm of the last lens of said optical lens group to said imaging surface in said close-up position satisfy: 0< (BFLi/fi) - (BFLm/fm) < 0.2.

10. A mobile focusing optical lens assembly according to claim 1, wherein the focal length fi of said optical lens assembly in said telephoto position and the focal length fm of said optical lens assembly in said close-up position satisfy: 1< fi/fm < 1.5.

11. A mobile focusing optical lens assembly as claimed in claim 1, wherein the distance TDi from the object side surface of the first lens of said optical lens assembly to the image side surface of the last lens of said optical lens assembly on said optical axis in said telephoto position, the distance TDm from the object side surface of the first lens of said optical lens assembly to the image side surface of the last lens of said optical lens assembly on said optical axis in said close-up position of said optical lens assembly, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of said optical lens assembly satisfy: the absolute value TDi-TDm absolute value/ImgH is more than or equal to 0.5 and less than 1.3.

12. A mobile focusing optical lens assembly according to claim 1, wherein the focal length fG1 of said first lens group and the focal length f1 of the first lens of said optical lens assembly satisfy: 0.5< f1/fG1< 2.

13. The moving focus optical lens group of claim 1, wherein a center thickness CT1 of a first lens of the optical lens group on the optical axis and an edge thickness ET1 of the first lens satisfy: 0.4< ET1/CT1< 0.9.

14. A moving-focus optical lens group according to claim 1, wherein a sum Σ CT of center thicknesses on the optical axis of the first lens of said optical lens group to the last lens of said optical lens group, respectively, and a sum Σ ET of edge thicknesses on the optical axis of the first lens of said optical lens group to the last lens of said optical lens group, respectively, satisfy: 0.7< ∑ ET/Σ CT is less than or equal to 1.

15. A mobile focusing optical lens assembly according to claim 1, wherein the distance from the object side surface of the first lens of said optical lens assembly to the imaging surface of said optical lens assembly on said optical axis is constant in said close-up and said far-out positions of said optical lens assembly.

16. A focusing optical lens assembly, comprising, in order from an object side to an image side:

a second lens group including two lenses having power;

the sum sigma CT of the central thicknesses of the first lens of the optical lens group to the last lens of the optical lens group on the optical axis respectively and the sum sigma ET of the edge thicknesses of the first lens of the optical lens group to the last lens of the optical lens group on the optical axis respectively satisfy: 0.7< ∑ ET/Σ CT is less than or equal to 1.

17. The mobile focusing optical lens group of claim 16, wherein the second lens group comprises one lens having a positive optical power and one lens having a negative optical power.

18. The mobile focusing optical lens group of claim 16, wherein the lens of the optical lens group near the object side of the optical lens group is a first lens having positive power, and wherein the object side surface of the first lens is a convex surface.

19. A mobile focusing optical lens group according to claim 16, wherein the distance Um between said object and the object side surface of the first lens of said optical lens group in close-up position of said optical lens group satisfies: the diameter is more than or equal to 45mm and less than 60 mm.

20. A mobile focusing optical lens assembly according to claim 16, wherein the length ImgH of half diagonal of effective pixel area on the imaging surface of said optical lens assembly is equal to the distance TTL between the object side surface of the first lens of said optical lens assembly and said imaging surface on said optical axis: 0.1< ImgH/TTL < 0.3.

21. A mobile focusing optical lens group according to claim 16, wherein the half Semi-FOVm of the maximum field angle of said optical lens group at close-up position and the aperture value fnom of said optical lens group at close-up position satisfy: 4< TAN (Semi-FOVm) × fnom < 7.

22. A mobile focusing optical lens group according to claim 16, wherein the focal length fi of said optical lens group in said telephoto position and the distance BFLi on said optical axis from the last lens of said optical lens group to the imaging surface of said optical lens group in said telephoto position satisfy: 0.3< BFLi/fi <1.

23. A mobile focusing optical lens group according to claim 16, wherein the focal length fm of said optical lens group in the close-up position and the distance BFLm of the last lens of said optical lens group to the imaging surface of said optical lens group on said optical axis when said optical lens group is in said close-up position satisfy: 0.1< BFLm/fm < 0.8.

24. A mobile focusing optical lens group according to claim 16, wherein the focal length fi of said optical lens group in the telephoto position, the focal length fm of said optical lens group in the close-up position, the distance BFLi on the optical axis from the last lens of said optical lens group to the imaging surface of said optical lens group in the telephoto position, and the distance BFLm on the optical axis from the last lens of said optical lens group to the imaging surface of said optical lens group in the close-up position satisfy: 0< (BFLi/fi) - (BFLm/fm) < 0.2.

25. A mobile focusing optical lens group according to claim 16, wherein the focal length fi of said optical lens group in the telephoto position and the focal length fm of said optical lens group in the close-up position satisfy: 1< fi/fm < 1.5.

26. A mobile focusing optical lens group according to claim 16, wherein the distance TDi from the object side surface of the first lens of said optical lens group to the image side surface of the last lens of said optical lens group on said optical axis in said telephoto position, the distance TDm from the object side surface of the first lens of said optical lens group to the image side surface of the last lens of said optical lens group on said optical axis in said telephoto position, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of said optical lens group satisfy: the absolute value TDi-TDm absolute value/ImgH is more than or equal to 0.5 and less than 1.3.

27. A mobile focusing optical lens assembly according to claim 16 wherein the focal length fG1 of the first lens group and the focal length f1 of the first lens of said optical lens assembly satisfy: 0.5< f1/fG1< 2.

28. The moving focus optical lens group of claim 16, wherein a center thickness CT1 of a first lens of the optical lens group on the optical axis and an edge thickness ET1 of the first lens satisfy: 0.4< ET1/CT1< 0.9.

29. The mobile focusing optical lens group of claim 16, wherein a distance on the optical axis from an object side surface of the first lens of the optical lens group to an imaging surface of the optical lens group is constant in the close-up position and the far-up position of the optical lens group.