CN216792555U

CN216792555U - Focusing camera lens group

Info

Publication number: CN216792555U
Application number: CN202220086867.3U
Authority: CN
Inventors: 程一夫; 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: 2022-01-13
Filing date: 2022-01-13
Publication date: 2022-06-21
Anticipated expiration: 2032-01-13

Abstract

The utility model provides a focusing camera lens group. The focusing lens assembly sequentially comprises from the object side to the image side along the optical axis: a first lens group having positive refractive power; a second lens group; the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; when the distance between the shot object and the focusing camera lens group is from far to near, adjusting the spacing distance between the first lens group and the second lens group on the optical axis to execute focusing; the entrance pupil diameter EPD of the focusing camera lens group and the sum sigma CT of the thicknesses of the first lens to the seventh lens in the focusing camera lens group on the optical axis respectively satisfy: EPD/Sigma CT < 0.8. The utility model solves the problem that the focusing camera lens group in the prior art is small in size, large in image surface, large in depth of field and large in aperture and cannot be taken into consideration simultaneously.

Description

Focusing camera lens group

Technical Field

The utility model relates to the technical field of optical imaging equipment, in particular to a focusing camera lens group.

Background

With continuous innovation of science and technology and increase of market demands of smart phones, an optical lens set applied to a smart phone gradually becomes a focus of attention of people, and a camera function of the smart phone is continuously updated along with various demands of users. At present, 2 to 8 cameras are generally arranged on a smart phone, so that the lightening and thinning of a single camera becomes a key concern of mobile phone manufacturers and users. The optical lens group has a large image surface, so that high resolution can be realized in actual shooting, and the optical lens group is favored by most users and mobile phone manufacturers, but the large image surface of the optical lens group leads the whole optical lens group to be long, so that the whole optical lens group is large in size and weight; the focusing lens assembly for photographing provided in the prior art has poor imaging definition during close-up photographing and far-up photographing, and is difficult to satisfy the user's requirements, so that there is an urgent need for a focusing lens assembly for a light and thin portable electronic product, which has the characteristics of large depth of field, large aperture, good imaging quality, and low power consumption.

Due to the space limitation of light and thin portable electronic products, the miniaturized camera head cannot meet the high-definition requirements of long-distance shooting and close-distance shooting at the same time easily, and meanwhile, the design challenge is how to realize focusing more quickly along with the development of the camera head.

That is, the focusing lens group in the prior art has the problems of miniaturization, large image plane, large depth of field and large aperture which are difficult to be simultaneously considered.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a focusing lens assembly for capturing images, which solves the problem of the prior art that the focusing lens assembly is not compact, has a large image plane, a large depth of field and a large aperture.

In order to achieve the above object, according to one aspect of the present invention, there is provided a focus imaging lens group comprising, in order from a subject side to an image side along an optical axis: a first lens group having positive optical power; a second lens group; the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; when the distance between the shot object and the focusing camera lens group is from far to near, adjusting the spacing distance between the first lens group and the second lens group on the optical axis to execute focusing; the entrance pupil diameter EPD of the focusing camera lens group and the sum sigma CT of the thicknesses of the first lens to the seventh lens in the focusing camera lens group on the optical axis respectively satisfy: EPD/Sigma CT < 0.8.

Further, the focus image pickup lens group further includes a diaphragm located on the object side of the second lens.

Further, when the focusing lens group is used for close-up shooting, the distance Um between the shot object and the shot object side surface of the first lens meets the following requirements: the Um is more than or equal to 90mm and less than or equal to 200 mm.

Further, the distance TTLi on the optical axis from the subject side surface of the first lens element to the imaging surface of the focus imaging lens group at the time of telephoto, the half ImgHi of the diagonal line length of the effective pixel area on the imaging surface of the focus imaging lens group at the time of telephoto, and the half Semi-FOVi of the maximum field angle of the focus imaging lens group at the time of telephoto satisfy: 1< TTLi/ImgHi tan (Semi-FOVi) < 2.

Further, the distance TTLi of the optical axis from the object side surface of the first lens element to the imaging surface when the focusing camera lens group is in the long shot, the half ImgHi of the diagonal length of the effective pixel area on the imaging surface when the focusing camera lens group is in the long shot, the distance TTLm of the optical axis from the object side surface of the first lens element to the imaging surface when the focusing camera lens group is in the close shot, and the half ImgHm of the diagonal length of the effective pixel area on the imaging surface when the focusing camera lens group is in the close shot satisfy: i TTLi/ImgHi-TTLm/ImgHm I < 0.15.

Further, the focal length Fg1 of the first lens group, the focal length fi of the focusing camera lens group at the time of long shot, and the focal length fm of the focusing camera lens group at the time of close shot satisfy: i Fg1/fi-Fg1/fm | < 0.1.

Further, the aperture value fnoi of the focusing camera lens group in the long shot and the aperture value fnom of the focusing camera lens group in the close shot satisfy the following condition: 0.9< fnoi/fnom < 1.2.

Further, a distance TDm on the optical axis from the object side surface of the first lens element to the image side surface of the seventh lens element when the focus camera lens group is close-up, a distance TTLm on the optical axis from the object side surface of the first lens element to the image side surface of the seventh lens element when the focus camera lens group is close-up, a distance TDi on the optical axis from the object side surface of the first lens element to the image side surface of the seventh lens element when the focus camera lens group is far-up, and a distance TTLi on the optical axis from the object side surface of the first lens element to the image side surface when the focus camera lens group is far-up satisfy: 0.8< (TDi/TTLi)/(TDm/TTLm) <1.

Furthermore, the sum Σ ET of the edge thickness of each lens in the focusing lens assembly and the sum Σ CT of the thicknesses of the first to fifth lenses on the optical axis in the focusing lens assembly satisfy: 0.5< ∑ ET/Σ CT <1.

Further, the edge thickness ET1 of the first lens and the edge thickness ET7 of the seventh lens satisfy: 0.2< ET1/ET7< 0.8.

Further, the distance BFLm between the image side surface of the seventh lens element and the imaging surface on the optical axis when the focusing camera lens group performs close-up shooting and the sum Σ ATm between the distances on the optical axis of the air gaps between the first lens element and the seventh lens element when the focusing camera lens group performs close-up shooting satisfy: BFLm/sigma ATm < 0.5.

Further, the sum Σ ATm of the distances on the optical axis of the air gaps between the first to seventh lenses in close-up of the focus image-taking lens group and the distance Σ T67m on the optical axis of the air gaps between the sixth to seventh lenses in close-up of the focus image-taking lens group satisfy: 0.3< T67m/∑ ATm < 0.8.

Furthermore, the focusing lens assembly satisfies the difference Δ T between the intervals between the first lens assembly and the second lens assembly on the optical axis during close-up and far-up photographing and the sum Σ CT of the thicknesses of the first lens assembly to the fifth lens assembly on the optical axis: Δ T/Σ CT < 0.5.

Further, the refractive index N2 of the second lens, the refractive index N3 of the third lens and the refractive index N4 of the fourth lens satisfy that: 4.5< N2+ N3+ N4< 5.

Further, a lens number V with an Abbe number of more than 50₅₀Satisfies the following conditions: v₅₀≥2。

According to another aspect of the present invention, there is provided a focus image capturing lens group, comprising in order from a subject side to an image side along an optical axis: a first lens group having positive optical power; a second lens group; the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; when the distance between the shot object and the focusing camera lens group is from far to near, adjusting the spacing distance between the first lens group and the second lens group on the optical axis to execute focusing; when the focusing shooting lens group is in close shooting, the distance Um between a shot object and the shot object side surface of the first lens meets the following requirements: the Um is more than or equal to 90mm and less than or equal to 200 mm.

Further, the entrance pupil diameter EPD of the focusing lens assembly and the sum Σ CT of thicknesses of the first lens element to the seventh lens element in the focusing lens assembly on the optical axis satisfy: EPD/Sigma CT < 0.8; the focusing camera lens group also comprises a diaphragm which is positioned on the object side of the second lens.

By applying the technical scheme of the utility model, the focusing and shooting lens group sequentially comprises a first lens group and a second lens group with positive focal power from the object side to the image side along the optical axis; the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; when the distance between the shot object and the focusing camera lens group is from far to near, adjusting the spacing distance between the first lens group and the second lens group on the optical axis to execute focusing; the entrance pupil diameter EPD of the focusing camera lens group and the sum sigma CT of the thicknesses of the first lens to the seventh lens in the focusing camera lens group on the optical axis respectively satisfy: EPD/Sigma CT < 0.8.

Through the focal power of rational planning first lens assembly, the distortion and the astigmatic problem of whole system that can be better balanced on the one hand, be favorable to obtaining bigger image plane on the other hand for the lens group of making a video recording of focusing possess higher image quality. By controlling the ratio of the entrance pupil diameter EPD of the focusing camera lens group to the sum sigma CT of the thicknesses of the first lens to the seventh lens on the optical axis in the focusing camera lens group within a reasonable range, the miniaturization of the focusing camera lens group is ensured, meanwhile, the system has enough luminous flux to ensure that the image surface has higher illumination, and excellent imaging quality is maintained in night shooting or in an environment with weak light energy. In addition, the focusing camera lens group adopts seven lenses, which is beneficial to realizing miniaturization, can keep clear imaging capability to a far shot object in the actual shooting process, can ensure enough imaging light to enter an optical system in close shot, reduces noise of an imaging picture, improves the imaging effect of close shot, and is beneficial to realizing the characteristics of large depth of field and large aperture.

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 structural view of a focusing imaging lens group according to a first example of the present invention;

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

fig. 3 to 5 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the focusing image pickup lens group of fig. 1, respectively;

fig. 6 to 8 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the focusing image pickup lens group in fig. 2, respectively;

FIG. 9 is a schematic view showing a focusing lens group according to a second embodiment of the present invention;

FIG. 10 is a schematic view showing a focusing lens group according to a second embodiment of the present invention;

fig. 11 to 13 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the focusing image pickup lens group in fig. 9, respectively;

fig. 14 to 16 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the focusing image pickup lens group in fig. 10, respectively;

FIG. 17 is a schematic view showing the construction of a focusing imaging lens group of example III of the present invention at the time of telephoto shooting;

fig. 18 is a schematic view showing a configuration of a focusing imaging lens group of example three of the present invention at the time of close-up;

fig. 19 to 21 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the focusing image pickup lens group in fig. 17, respectively;

fig. 22 to 24 respectively show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the focusing image pickup lens group in fig. 18;

fig. 25 is a schematic view showing a configuration of a focusing image pickup lens group of example four of the present invention at the time of telephoto shooting;

fig. 26 is a schematic view showing a configuration of a focusing image pickup lens group of example four of the present invention at the time of close-up;

fig. 27 to 29 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the focusing image pickup lens group in fig. 25, respectively;

fig. 30 to 32 show an on-axis aberration curve, an astigmatism curve, and a distortion curve of the focus image pickup lens group in fig. 26, respectively.

Wherein the figures include the following reference numerals:

STO, stop; g1, a first lens group; e1, first lens; s1, the subject 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; g2, second lens group; e7, seventh lens; s13, the object side surface of the seventh lens; s14, an image side surface of the seventh lens element; e8, optical filters; s15, the side of the object to be shot of the optical filter; s16, the image side surface of the optical filter; and S17, imaging surface.

Detailed Description

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

It is 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 only used 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. Regarding the side of the object, when the R value is positive, the side is judged to be convex, and when the R value is negative, the side 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.

The utility model provides a focusing camera lens group, aiming at solving the problem that the focusing camera lens group in the prior art is small in size, large in image plane, large in depth of field and large in aperture and cannot be taken into consideration simultaneously.

Example one

As shown in fig. 1 to 32, the focusing imaging lens assembly includes, in order from the object side to the image side along the optical axis, a first lens group and a second lens group having positive power; the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; when the distance between the shot object and the focusing camera lens group is from far to near, adjusting the spacing distance between the first lens group and the second lens group on the optical axis to execute focusing; the entrance pupil diameter EPD of the focusing camera lens group and the sum sigma CT of the thicknesses of the first lens to the seventh lens in the focusing camera lens group on the optical axis respectively satisfy: EPD/Sigma CT < 0.8.

Preferably, EPD/Σ CT < 0.6.

Through the focal power of rational planning first lens assembly, the distortion and the astigmatic problem of whole system that can be better balanced on the one hand, be favorable to obtaining bigger image plane on the other hand for the lens group of making a video recording of focusing possess higher image quality. By controlling the ratio of the entrance pupil diameter EPD of the focusing camera lens group to the sum sigma CT of the thicknesses of the first lens to the seventh lens on the optical axis in the focusing camera lens group within a reasonable range, the miniaturization of the focusing camera lens group is ensured, meanwhile, the system has enough luminous flux to ensure that the image surface has higher illumination, and excellent imaging quality is maintained in night shooting or in an environment with weak light energy. In addition, the focusing camera lens group of the application adopts seven lenses, which is beneficial to realizing miniaturization, can keep clear imaging capability to a shot object at a far position in the actual shooting process, can also ensure enough imaging light to enter an optical system in close-up shooting, reduces the noise of an imaging picture, improves the imaging effect of close-up shooting, and is beneficial to realizing the characteristics of large depth of field and large aperture.

In this embodiment, the focus image capturing lens assembly further includes a stop located on the object side of the second lens element. The diaphragm is located between the object side of being shot and the second lens, can realize that the light ring changes, when better satisfying the demand of shooing, the tele end can obtain better analytic power, reduces the degree of difficulty of design. Meanwhile, the aperture of the lens can be reduced, and the miniaturization is facilitated.

In this embodiment, when the focusing imaging lens group performs close-up imaging, the distance Um between the object and the object side surface of the first lens satisfies: the Um is more than or equal to 90mm and less than or equal to 200 mm. Along with the development of times, the requirement of users on the performance of micro distance is higher and higher, the focusing camera lens group can realize clear imaging under the ultra-short distance of 90-200 mm, the requirements of the users are met, and the focusing camera lens group is suitable for wider life scenes. Preferably 100 mm. ltoreq. Um. ltoreq.180 mm.

In this embodiment, the distance TTLi from the object side surface of the first lens element to the imaging surface in the telephoto shooting, the half ImgHi of the diagonal line length of the effective pixel area on the imaging surface in the telephoto shooting, and the half Semi-FOVi of the maximum field angle in the telephoto shooting of the focus shooting lens group satisfy: 1< TTLi/ImgHi tan (Semi-FOVi) < 2. The distance TTLi from the side face of a shot object of the first lens to an imaging surface on an optical axis when the focusing shooting lens group is used for shooting at a far distance is reasonably restricted, and the relation between half ImgHi of the diagonal line of an effective pixel area on the imaging surface when the focusing shooting lens group is used for shooting at a far distance and half Semi-FOVi of the maximum field angle when the focusing shooting lens group is used for shooting at a far distance is in a reasonable range, so that the focusing shooting lens group is thinner as a whole, the image surface is larger, the field angle is larger, more detailed information of the shot object can be presented by the focusing shooting lens group, and the characteristics of high resolution, large depth of field and large aperture are realized while the miniaturization is met. Preferably, 1.2< TTLi/ImgHi tan (Semi-FOVi) < 1.6.

In this embodiment, the distance TTLi on the optical axis from the object side surface of the first lens element to the imaging surface when the focusing camera lens group is in the long shot, the half ImgHi of the diagonal length of the effective pixel area on the imaging surface when the focusing camera lens group is in the long shot, the distance TTLm on the optical axis from the object side surface of the first lens element to the imaging surface when the focusing camera lens group is in the close shot, and the half ImgHm of the diagonal length of the effective pixel area on the imaging surface when the focusing camera lens group is in the close shot satisfy: i TTLi/ImgHi-TTLm/ImgHm I < 0.15. The condition is satisfied, the total length of the system is close when the lens group is used for controlling the long shot and the close shot, the image surface size is close, the condition that the lens group is unfavorable to install when the module is assembled is ensured, the movement of the second lens group is not interfered with the module end when the long shot and the close shot are ensured, the picture change is small when the long shot and the close shot are switched, more detailed information of the shot object is presented, and the user experience is improved. Preferably, | TTLi/ImgHi-TTLm/ImgHm | ≦ 0.1.

In the present embodiment, the focal length Fg1 of the first lens group, the focal length fi of the focusing imaging lens group at the time of long shot, and the focal length fm of the focusing imaging lens group at the time of close shot satisfy: i Fg1/fi-Fg1/fm | < 0.1. The conditional expression is satisfied, on one hand, the distortion and astigmatism problems of the whole system can be better balanced, on the other hand, the focal length change amplitude is smaller when the distance and the close range are switched, and the stroke of the motor is controlled within a reasonable range.

In this embodiment, the aperture value fnoi of the focusing lens group at the time of long shot and the aperture value fnom of the focusing lens group at the time of close shot satisfy: 0.9< fnoi/fnom < 1.2. The condition is satisfied, the focusing camera lens group under the microspur can obtain enough luminous flux to ensure that the image surface has higher illumination, the change range of the whole system is smaller, and the stroke of the motor is controlled within a reasonable range.

In this embodiment, a distance TDm between the object side of the first lens element and the image side of the seventh lens element on the optical axis when the focus camera lens assembly performs close-up shooting, a distance TTLm between the object side of the first lens element and the image plane when the focus camera lens assembly performs close-up shooting, a distance TDi between the object side of the first lens element and the image side of the seventh lens element on the optical axis when the focus camera lens assembly performs far-up shooting, and a distance TTLi between the object side of the first lens element and the image plane when the focus camera lens assembly performs far-up shooting satisfy: 0.8< (TDi/TTLi)/(TDm/TTLm) <1. Satisfy this conditional expression for when long-range taking and close-up taking with this obtain comparatively reasonable back burnt value, prevent that the module end that the burnt too big or undersize of back caused is bad, reduce the working stroke of motor when focusing simultaneously, guarantee to focus the miniaturization of making a video recording lens group.

In this embodiment, the sum Σ ET of the edge thickness of each lens in the focusing lens assembly and the sum Σ CT of the thicknesses of the first to fifth lenses on the optical axis in the focusing lens assembly satisfy: 0.5< ∑ ET/Σ CT <1. Satisfy this conditional expression, on the one hand can be better the distortion and the field curvature of balanced entire system, on the other hand ensures that each lens is difficult to warp at the equipment in-process, has very big help to the stability of field curvature, and shaping debugging process space is bigger in addition, avoids lens appearance problem to appear and leads to the veiling glare risk. Preferably, 0.8< ∑ ET/Σ CT <1.

In the present embodiment, the edge thickness ET1 of the first lens and the edge thickness ET7 of the seventh lens satisfy: 0.2< ET1/ET7< 0.8. Satisfying this conditional expression, on the one hand can be better the colour difference of balanced entire system, on the other hand avoids the difficulty of actual course of working to prevent the risk that appears warping in the equipment process, has very big help to the stability of field curvature, prevents the production of the bad problem of outward appearance simultaneously.

In this embodiment, a distance BFLm between the image side surface of the seventh lens element and the image plane during close-up of the focusing imaging lens assembly and a sum Σ ATm between the distances on the optical axis of the air gaps between the first lens element and the seventh lens element during close-up of the focusing imaging lens assembly satisfy: BFLm/sigma ATm < 0.5. Satisfy this conditional expression, can guarantee when close-up taking the photograph under the prerequisite that the back burnt has enough space, avoid appearing the clearance undersize and lead to the assembling process front and back lens to interfere the scheduling problem, the air gap between reasonable adjustment lens simultaneously, the distortion of balanced system that can be better reduces ghost image energy, ensures that the system obtains better imaging quality.

In the present embodiment, the sum Σ ATm of the distances on the optical axis of the air gaps between the first to seventh lenses in close-up of the focus image pickup lens group and the distance Σ T67m on the optical axis of the air gaps between the sixth to seventh lenses in close-up of the focus image pickup lens group satisfy: 0.3< T67m/∑ ATm < 0.8. The condition is satisfied, the structural design and production line assembly process of lens barrels and spacers among the lenses can be guaranteed, and the distortion of the system can be better balanced. In addition, the working stroke of the motor during focusing can be reduced by controlling the conditional expression, and the miniaturization of the focusing camera lens group is ensured. Preferably, 0.3< T67m/∑ ATm < 0.7.

In this embodiment, the focusing lens assembly satisfies the following relationship between the difference Δ T between the intervals on the optical axis between the first lens assembly and the second lens assembly during close-up and far-up photographing and the total thickness Σ CT on the optical axis between the first lens assembly and the fifth lens assembly of the focusing lens assembly: Δ T/Σ CT < 0.5. The condition formula is met, on one hand, the requirement of assembly distance is ensured, and the problem of interference caused by overlarge distance between the first lens group and the second lens group in the running process of the motor is avoided; in addition, on one hand, the central thickness of each lens is reasonably controlled, and the problems that the processing and the assembly are difficult and the like due to overlarge or undersize central thickness are avoided. Preferably, Δ T/Σ CT < 0.4.

In the embodiment, the refractive index N2 of the second lens, the refractive index N3 of the third lens and the refractive index N4 of the fourth lens satisfy: 4.5< N2+ N3+ N4< 5. The second lens, the third lens and the fourth lens are sensitive lenses, the conditional expression is satisfied, the refractive indexes of the second lens, the third lens and the fourth lens are favorably improved, the performance can be obviously improved, and astigmatism, coma and the like can be better eliminated by the aid of high-refractive index and low-refractive index interval distribution. Preferably 4.7< N2+ N3+ N4< 4.9.

In the present embodiment, the number of lenses V having an Abbe number of more than 50₅₀Satisfies the following conditions: v₅₀Not less than 2. The lens with the Abbe number larger than 50 can effectively control dispersion, and meanwhile, the lens with the low refractive index with the Abbe number larger than 50 is superior to the lens with the high refractive index in the aspects of molding, appearance, reliability and the like, the manufacturability is better, the difficulty in the actual processing process is avoided, and the yield is ensured.

Example two

As shown in fig. 1 to 32, the focusing imaging lens assembly includes, in order from the object side to the image side along the optical axis, a first lens group and a second lens group having positive power; the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; when the distance between the shot object and the focusing camera lens group is from far to near, adjusting the spacing distance between the first lens group and the second lens group on the optical axis to execute focusing; when the focusing shooting lens group is in close shooting, the distance Um between a shot object and the shot object side surface of the first lens meets the following requirements: the Um is more than or equal to 90mm and less than or equal to 200 mm.

Preferably 100 mm. ltoreq. Um. ltoreq.180 mm.

Through the focal power of rational planning first lens assembly, the distortion and the astigmatic problem of whole system that can be better balanced on the one hand, be favorable to obtaining bigger image plane on the other hand for the lens group of making a video recording of focusing possess higher image quality. Along with the development of times, the requirement of users on the performance of micro distance is higher and higher, the focusing camera lens group can realize clear imaging under the ultra-short distance of 90-200 mm, the requirements of the users are met, and the focusing camera lens group is suitable for wider life scenes. In addition, the focusing camera lens group of the application adopts seven lenses, which is beneficial to realizing miniaturization, can keep clear imaging capability to a shot object at a far position in the actual shooting process, can also ensure enough imaging light to enter an optical system in close-up shooting, reduces the noise of an imaging picture, improves the imaging effect of close-up shooting, and is beneficial to realizing the characteristics of large depth of field and large aperture.

In this embodiment, the entrance pupil diameter EPD of the focusing lens assembly and the sum Σ CT of the thicknesses of the first to seventh lenses in the focusing lens assembly on the optical axis satisfy: EPD/Sigma CT < 0.8. By controlling the ratio of the entrance pupil diameter EPD of the focusing camera lens group to the sum sigma CT of the thicknesses of the first lens to the seventh lens on the optical axis in the focusing camera lens group in a reasonable range, the system has enough luminous flux to ensure that the image plane has higher illumination intensity while ensuring the miniaturization of the focusing camera lens group, and excellent imaging quality is kept in night shooting or in an environment with weak light energy. Preferably, EPD/Σ CT < 0.6.

In this embodiment, the focus image capturing lens assembly further includes a stop located on the object side of the second lens element. The diaphragm is located between the object side of shooing and the second lens, can realize that the light ring changes, when better satisfying the demand of shooing, the tele end can obtain better analytic power, reduces the degree of difficulty of design. Meanwhile, the caliber of the lens can be reduced, and the miniaturization is facilitated.

In this embodiment, the distance TTLi on the optical axis from the subject side surface of the first lens element to the imaging plane of the focusing camera lens group at the time of the long shot, the half ImgHi of the diagonal length of the effective pixel area on the imaging plane of the focusing camera lens group at the time of the long shot, and the half Semi-FOVi of the maximum field angle of the focusing camera lens group at the time of the long shot satisfy: 1< TTLi/ImgHi tan (Semi-FOVi) < 2. The distance TTLi from the side face of a shot object of the first lens to an imaging surface on an optical axis when the focusing shooting lens group is used for shooting at a far distance is reasonably restricted, and the relation between half ImgHi of the diagonal line of an effective pixel area on the imaging surface when the focusing shooting lens group is used for shooting at a far distance and half Semi-FOVi of the maximum field angle when the focusing shooting lens group is used for shooting at a far distance is in a reasonable range, so that the focusing shooting lens group is thinner as a whole, the image surface is larger, the field angle is larger, more detailed information of the shot object can be presented by the focusing shooting lens group, and the characteristics of high resolution, large depth of field and large aperture are realized while the miniaturization is met. Preferably, 1.2< TTLi/ImgHi tan (Semi-FOVi) < 1.6.

In this embodiment, the distance TTLi on the optical axis from the object side surface of the first lens element to the imaging surface when the focusing camera lens group is in the long shot, the half ImgHi of the diagonal length of the effective pixel area on the imaging surface when the focusing camera lens group is in the long shot, the distance TTLm on the optical axis from the object side surface of the first lens element to the imaging surface when the focusing camera lens group is in the close shot, and the half ImgHm of the diagonal length of the effective pixel area on the imaging surface when the focusing camera lens group is in the close shot satisfy: | TTLi/ImgHi-TTLm/ImgHm | < 0.15. The condition is satisfied, the total length of the system is close when the lens group is used for controlling the long shot and the close shot, the image surface size is close, the condition that the lens group is unfavorable to install when the module is assembled is ensured, the movement of the second lens group is not interfered with the module end when the long shot and the close shot are ensured, the picture change is small when the long shot and the close shot are switched, more detailed information of the shot object is presented, and the user experience is improved. Preferably, | TTLi/ImgHi-TTLm/ImgHm | ≦ 0.1.

In the present embodiment, the focal length Fg1 of the first lens group, the focal length fi of the focusing imaging lens group at the time of long shot, and the focal length fm of the focusing imaging lens group at the time of close shot satisfy: i Fg1/fi-Fg1/fm | < 0.1. The conditional expression is satisfied, on one hand, the distortion and astigmatism problems of the whole system can be better balanced, on the other hand, the small focal length change amplitude is ensured when the far and near scenes are switched, and the stroke of the motor is controlled within a reasonable range.

In this embodiment, the sum Σ ATm of the distance BFLm on the optical axis from the image side surface of the seventh lens element to the image forming surface when the focus image capturing lens group is in close-up, and the distance Σ ATm on the optical axis between the air gaps between the first lens element and the seventh lens element when the focus image capturing lens group is in close-up satisfies: BFLm/sigma ATm < 0.5. Satisfy this conditional expression, can guarantee when close-up taking the photograph under the prerequisite that the back burnt has enough space, avoid appearing the clearance undersize and lead to the assembling process front and back lens to interfere the scheduling problem, the air gap between reasonable adjustment lens simultaneously, the distortion of balanced system that can be better reduces ghost image energy, ensures that the system obtains better imaging quality.

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

The focusing lens group in the present application may employ a plurality of lenses, for example, the above-mentioned seven lenses. The focal power, the surface shape, the center thickness of each lens, the on-axis distance between each lens and the like are reasonably distributed, so that the sensitivity can be effectively reduced, the machinability can be improved, and the focusing camera lens group is more favorable for production and processing and can be suitable for portable electronic equipment such as a smart phone. The left side is the object side, and the right side is the image side.

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 a focusing image capturing lens group can be varied without departing from the technical solutions claimed in the present application to achieve the various results and advantages described in the present specification. For example, although seven lenses are exemplified in the embodiment, the focus image pickup lens group is not limited to include seven lenses. The focus camera lens group may further include other numbers of lenses, if necessary.

Specific surface types and parameters of the focusing image capturing 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 four is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 8, a focusing image pickup lens group according to the first example of the present application is described. Fig. 1 is a schematic view showing a configuration of a focusing image pickup lens group of example one at the time of a telephoto shot; fig. 2 is a schematic diagram showing the configuration of the focusing lens group of the first example at the time of close-up.

As shown in fig. 1 and fig. 2, the focusing lens assembly, in order from the object side to the image side, comprises: a first lens group G1, a second lens group G2, a filter E8 and an image plane S17. Wherein the first lens group G1 includes: 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. The stop STO is disposed on the object side of the first lens E1.

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

In the present example, the distance TTLi on the optical axis from the object side surface of the first lens element to the image plane when the focus image pickup lens group performs a telephoto shooting is 11.85 mm; the distance TTLm between the side surface of a shot object of the first lens and an imaging surface of the focusing shooting lens group in close shooting on the optical axis is 11.85 mm; the half Imghi of the diagonal length of the effective pixel area on the imaging surface of the focusing camera lens group in the long shot is 5.32 mm; the half ImgHm of the diagonal length of the effective pixel area on the imaging surface of the focusing camera lens group during close-up shooting is 5.12 mm; the focal length fi of the focusing camera lens group during long-distance shooting is 9.61 mm; the focal length fm of the focusing camera lens group during close-up shooting is 9.42 mm; half of the Semi-FOVi of the maximum field angle of the focusing camera lens group during long-distance shooting is 28.59 degrees; half of the maximum field angle Semi-FOvm of the focus image pickup lens group at the time of close-up is 27.87 °.

Table 1 shows a basic structural parameter table of the focusing image pickup lens group of example one, in which the units of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 1

In the first example, the object-side surface and the image-side surface of any one of the first lens E1 to the seventh lens E7 are aspheric surfaces, and the surface shape 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 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S14 in example one.

TABLE 2

Fig. 3 shows an on-axis aberration curve of the focusing lens group of the first example at the time of telephoto shooting, which represents the convergent focus deviation of light rays of different wavelengths after passing through the focusing lens group. Fig. 4 shows an astigmatism curve at the time of telephoto imaging of the focusing imaging lens group of example one, which represents meridional field curvature and sagittal field curvature. Fig. 5 shows distortion curves of the focusing imaging lens group of example one at the time of telephoto imaging, which represent values of distortion magnitudes corresponding to different angles of view.

Fig. 6 shows an on-axis aberration curve of the focusing lens group of the first example at close-up, which represents the convergent focus deviation of light rays of different wavelengths after passing through the focusing lens group. Fig. 7 shows an astigmatism curve at close-up of the focusing imaging lens group of example one, which represents meridional field curvature and sagittal field curvature. Fig. 8 shows distortion curves of the focusing lens group of the first example at close-up, which indicate distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 3 to 8, the focusing lens assembly of the first example can achieve good image quality.

Example two

As shown in fig. 9 to 16, a focusing image pickup lens group of the second example of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 9 is a schematic view showing the configuration of a focusing imaging lens group of example two at the time of telephoto shooting; fig. 10 is a schematic view showing the structure of the focusing lens group of example two at the time of close-up.

As shown in fig. 9 and 10, the focusing lens assembly comprises, in order from a subject side to an image side: the lens group comprises a first lens group G1, a second lens group G2, a filter E8 and an image plane S17. Wherein the first lens group G1 includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6; the second lens group G2 includes a seventh lens E7. The stop STO is disposed between the first lens E1 and the second lens E2.

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

In this example, the distance TTLi on the optical axis from the subject side surface of the first lens element to the image forming surface when the focusing camera lens group takes a long shot is 12.14 mm; the distance TTLm between the side surface of a shot object of the first lens and an imaging surface of the focusing shooting lens group in close shooting on the optical axis is 12.11 mm; the half Imghi of the diagonal length of the effective pixel area on the imaging surface of the focusing camera lens group in the long shot is 5.32 mm; the half ImgHm of the diagonal length of the effective pixel area on the imaging surface of the focusing camera lens group during close-up shooting is 5.12 mm; the focal length fi of the focusing camera lens group during long-distance shooting is 7.58 mm; the focal length fm of the focusing camera lens group during close-up shooting is 6.99 mm; half of the Semi-FOVi of the maximum field angle of the focusing camera lens group in the long-distance shooting is 34.22 degrees; the half of the maximum field angle of the focusing camera lens group at the time of close-up photographing, Semi-FOvm, was 34.28 °.

Table 3 shows a basic structural parameter table of the focusing camera lens group of example two, in which the units of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 3

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

S1

2.2146E-02

-3.7404E-03

6.5938E-04

-1.1224E-04

1.2855E-05

-8.0104E-07

2.0392E-08

0.0000E+00

S2

2.0228E-02

-1.4058E-03

-5.7398E-05

2.3707E-05

-1.7808E-06

2.0867E-08

2.0326E-09

0.0000E+00

S3

-8.3941E-03

2.5469E-03

-8.3298E-04

1.6820E-04

-2.3680E-05

2.0531E-06

-7.6277E-08

0.0000E+00

S4

-2.5025E-02

6.1531E-03

-1.1038E-03

7.8565E-05

8.7892E-06

-1.9830E-06

1.0734E-07

0.0000E+00

S5

-3.3423E-03

-1.9740E-04

1.4010E-03

-1.0044E-03

2.9872E-04

-4.2531E-05

2.4337E-06

0.0000E+00

S6

1.4434E-02

-1.7711E-03

2.0222E-03

-1.2958E-03

3.9649E-04

-5.8648E-05

3.4775E-06

0.0000E+00

S7

4.0812E-02

-1.8070E-02

5.4189E-03

-1.0045E-03

3.0496E-05

1.7672E-05

-1.8842E-06

0.0000E+00

S8

8.9062E-03

-4.4304E-03

1.0406E-03

-1.7633E-04

1.2079E-05

4.1111E-07

-1.0577E-07

3.9856E-09

S9

-1.7902E-02

3.5035E-03

-5.6565E-04

6.2185E-05

-4.1702E-06

1.5063E-07

-2.2218E-09

0.0000E+00

S10

-5.3201E-03

2.2493E-03

-3.7251E-04

3.7547E-05

-2.1159E-06

5.8236E-08

-5.7159E-10

0.0000E+00

S11

-1.7016E-03

1.3865E-03

-3.2952E-04

4.8157E-05

-4.4712E-06

2.7191E-07

-1.1992E-08

3.8294E-10

S12

2.7317E-05

-2.0614E-04

2.8904E-05

-1.3535E-07

-1.8489E-07

1.0670E-08

-1.7642E-10

0.0000E+00

S13

5.3973E-03

-8.6799E-04

9.1504E-05

-5.5383E-06

1.8612E-07

-3.2360E-09

2.2769E-11

0.0000E+00

S14

5.5564E-03

-7.3395E-04

6.5265E-05

-3.1582E-06

6.9113E-08

2.0926E-11

-1.7630E-11

0.0000E+00

TABLE 4

Fig. 11 shows an on-axis aberration curve of the focusing lens group of the second example at the time of telephoto shooting, which represents the convergent focus deviation of light rays of different wavelengths after passing through the focusing lens group. Fig. 12 shows an astigmatism curve at the time of telephoto imaging of the focusing imaging lens group of the second example, which represents meridional field curvature and sagittal field curvature. Fig. 13 shows distortion curves of the focusing imaging lens group of example two at the time of telephoto imaging, which represent values of distortion magnitudes corresponding to different angles of view.

Fig. 14 shows an on-axis aberration curve at close-up of the focusing lens group of the second example, which shows the convergent focus deviation of light rays of different wavelengths after passing through the focusing lens group. Fig. 15 shows an astigmatism curve at close-up of the focusing imaging lens group of the second example, which represents meridional field curvature and sagittal field curvature. Fig. 16 shows distortion curves of the focusing imaging lens group of example two at close-up, which indicate values of distortion magnitude corresponding to different angles of view.

As can be seen from fig. 11 to 16, the focusing lens assembly of the second example can achieve good image quality.

Example III

As shown in fig. 17 to 24, a focusing image pickup lens group of the third example of the present application is described. Fig. 17 is a schematic view showing the configuration of a focusing imaging lens group of example three at the time of telephoto shooting; fig. 18 is a schematic view showing the structure of a focusing imaging lens group of example three at the time of close-up.

As shown in fig. 17 and 18, the focusing lens assembly, in order from the object side to the image side, comprises: a first lens group G1, a second lens group G2, a filter E8 and an image plane S17. Wherein the first lens group G1 includes: 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. The stop STO is disposed on the object side of the first lens E1.

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

In this example, the distance TTLi on the optical axis from the subject side surface of the first lens element to the image plane when the focus shooting lens group takes a long shot is 12.00 mm; the distance TTLm between the side surface of a shot object of the first lens and an imaging surface of the focusing shooting lens group in close shooting on the optical axis is 12.00 mm; the half Imghi of the diagonal length of the effective pixel area on the imaging surface of the focusing camera lens group in the long shot is 5.00 mm; the half ImgHm of the diagonal length of the effective pixel area on the imaging surface of the focusing camera lens group during close-up shooting is 4.80 mm; the focal length fi of the focusing camera lens group during long-distance shooting is 8.32 mm; the focal length fm of the focusing camera lens group during close-up shooting is 7.86 mm; half of the maximum field angle of the focusing camera lens group during the long-distance shooting is 29.97 degrees; half of the maximum field angle Semi-FOvm of the focus image pickup lens group at the time of close-up is 29.62 °.

Table 5 shows a basic structural parameter table of the focusing image pickup lens group of example three, in which the units of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 5

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.2503E-02

3.8430E-02

-2.0696E-01

6.3158E-01

-1.2449E+00

1.6836E+00

-1.6140E+00

S2

-1.7928E-02

1.2303E-03

-1.1330E-01

4.3456E-01

-9.1402E-01

1.2440E+00

-1.1577E+00

S3

1.4813E-02

1.4092E-02

-1.9548E-01

6.5058E-01

-1.2749E+00

1.6619E+00

-1.5062E+00

S4

1.0558E-02

-1.3719E-02

6.4078E-02

-1.6810E-01

2.8005E-01

-3.2255E-01

2.6639E-01

S5

-3.9018E-02

1.3357E-02

1.4133E-02

-5.4074E-02

8.2194E-02

-8.0230E-02

5.4995E-02

S6

-4.2507E-02

2.0471E-02

-9.8874E-03

8.1022E-03

-1.2998E-02

1.6376E-02

-1.3504E-02

S7

-4.3571E-02

1.1596E-02

-1.2998E-02

1.2449E-02

-5.5713E-03

-2.3998E-03

5.5853E-03

S8

-3.5022E-02

8.4207E-03

-3.8833E-03

-1.8334E-03

6.8829E-03

-7.6694E-03

5.0503E-03

S9

3.5788E-02

-1.3386E-02

-1.8354E-03

1.1926E-02

-1.3477E-02

8.9219E-03

-3.9369E-03

S10

4.4102E-03

-5.8604E-03

6.6855E-03

-3.7965E-03

1.2554E-03

-2.0759E-04

-1.1039E-05

S11

-1.9971E-02

-2.5098E-03

6.0287E-03

-4.0368E-03

1.7147E-03

-5.1334E-04

1.1228E-04

S12

-1.7137E-02

-5.9954E-04

1.9106E-03

-8.1786E-04

1.7195E-04

-7.8718E-06

-6.0067E-06

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.1155E+00

-5.5820E-01

2.0059E-01

-5.0508E-02

8.4673E-03

-8.4964E-04

3.8641E-05

S2

7.5493E-01

-3.4747E-01

1.1203E-01

-2.4674E-02

3.5206E-03

-2.9165E-04

1.0566E-05

S3

9.6831E-01

-4.4394E-01

1.4398E-01

-3.2231E-02

4.7314E-03

-4.0937E-04

1.5806E-05

S4

-1.6006E-01

7.0021E-02

-2.2037E-02

4.8526E-03

-7.0852E-04

6.1530E-05

-2.4025E-06

S5

-2.7254E-02

9.8295E-03

-2.5569E-03

4.6730E-04

-5.6905E-05

4.1426E-06

-1.3627E-07

S6

7.4840E-03

-2.8509E-03

7.4787E-04

-1.3243E-04

1.5061E-05

-9.8752E-07

2.8160E-08

S7

-4.2094E-03

1.8794E-03

-5.4702E-04

1.0513E-04

-1.2902E-05

9.1819E-07

-2.8873E-08

S8

-2.1965E-03

6.5446E-04

-1.3455E-04

1.8788E-05

-1.7022E-06

9.0290E-08

-2.1286E-09

S9

1.2088E-03

-2.6220E-04

4.0050E-05

-4.2153E-06

2.9093E-07

-1.1847E-08

2.1567E-10

S10

1.5002E-05

-3.9653E-06

5.9607E-07

-5.6708E-08

3.3878E-09

-1.1633E-10

1.7497E-12

S11

-1.8176E-05

2.1748E-06

-1.8972E-07

1.1716E-08

-4.8469E-10

1.2034E-11

-1.3545E-13

S12

1.9700E-06

-3.2991E-07

3.5234E-08

-2.4893E-09

1.1324E-10

-3.0156E-12

3.5801E-14

TABLE 6

Fig. 19 shows an on-axis aberration curve at the time of telephoto shooting for the focusing image-pickup lens group of example three, which represents the convergent focus deviation of light rays of different wavelengths after passing through the focusing image-pickup lens group. Fig. 20 shows an astigmatism curve at the time of telephoto imaging by the focusing imaging lens group of example three, which represents meridional field curvature and sagittal field curvature. Fig. 21 shows distortion curves at the time of telephoto imaging in the focusing imaging lens group of example three, which represent values of distortion magnitudes corresponding to different angles of view.

Fig. 22 shows an on-axis aberration curve at close-up of the focusing image-capturing lens group of example three, which represents the convergent focus deviation of light rays of different wavelengths after passing through the focusing image-capturing lens group. Fig. 23 shows an astigmatism curve at close-up of the focusing imaging lens group of example three, which represents meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves at close-up of the focusing imaging lens group of example three, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 19 to 24, the focusing lens assembly of the third example can achieve good image quality.

Example four

As shown in fig. 25 to 32, a focusing image pickup lens group of the present example four is described. Fig. 25 is a schematic view showing a configuration of a focusing image pickup lens group of example four at the time of telephoto shooting; fig. 26 is a schematic diagram showing the structure of a focusing imaging lens group of example four at the time of close-up.

As shown in fig. 25 and 26, the focusing lens assembly, in order from the object side to the image side, comprises: a first lens group G1, a second lens group G2, a filter E8 and an image plane S17. Wherein the first lens group G1 includes: 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. The stop STO is disposed on the object side of the first lens E1.

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

In the present example, the distance TTLi on the optical axis from the object side surface of the first lens element to the image plane when the focus image pickup lens group performs a telephoto shooting is 13.20 mm; the distance TTLm between the side surface of a shot object of the first lens and an imaging surface of the focusing shooting lens group in close shooting on the optical axis is 13.20 mm; the half Imghi of the diagonal length of the effective pixel area on the imaging surface of the focusing camera lens group in the long shot is 7.35 mm; the half ImgHm of the diagonal length of the effective pixel area on the imaging surface of the focusing camera lens group during close-up shooting is 7.15 mm; the focal length fi of the focusing camera lens group during long-distance shooting is 8.81 mm; the focal length fm of the focusing camera lens group during close-up shooting is 8.96 mm; half of the Semi-FOVi of the maximum field angle of the focusing camera lens group in the long shot is 39.27 degrees; half of the maximum field angle Semi-FOvm of the focusing lens group at the time of close-up is 39.03 °.

Table 7 shows a basic structural parameter table of the focusing image-pickup lens group of example four, in which the units of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 7

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-5.2001E-03

4.3852E-03

-2.0955E-02

5.5938E-02

-9.8472E-02

1.1847E-01

-1.0005E-01

S2

-1.1429E-02

2.7558E-04

-4.0630E-03

1.3604E-02

-2.8268E-02

3.7752E-02

-3.3952E-02

S3

-1.5411E-02

-2.9362E-03

6.1090E-03

-1.2680E-02

1.8245E-02

-1.7951E-02

1.2286E-02

S4

-9.3314E-03

-3.8489E-04

-1.4870E-03

2.0135E-03

-1.4701E-03

7.4719E-04

-2.7510E-04

S5

-1.0204E-03

5.5842E-04

-6.1128E-03

8.1274E-03

-6.8280E-03

3.8935E-03

-1.5143E-03

S6

-1.7170E-02

-5.3123E-03

1.6639E-02

-1.2047E-02

4.5501E-03

-9.8576E-04

1.1226E-04

S7

-8.8189E-03

-1.0485E-02

2.3380E-02

-1.6970E-02

7.0067E-03

-1.8545E-03

3.2404E-04

S8

1.1190E-02

-1.5214E-03

2.0825E-03

-2.1262E-03

1.2871E-03

-5.2165E-04

1.4624E-04

S9

-2.1470E-02

5.2590E-03

-2.0005E-03

6.6942E-04

-1.5828E-04

2.5749E-05

-2.9207E-06

S10

-2.8575E-02

3.4176E-03

-5.5609E-04

1.5243E-04

-3.7187E-05

6.1234E-06

-6.6971E-07

S11

3.0454E-02

-1.2321E-02

3.3425E-03

-7.2770E-04

1.1920E-04

-1.3715E-05

1.0640E-06

S12

1.8760E-02

-7.8078E-03

2.3586E-03

-5.6610E-04

9.9627E-05

-1.2400E-05

1.0922E-06

S13

1.0578E-02

-3.1737E-03

1.2222E-03

-2.4952E-04

2.7722E-05

-1.1179E-06

-1.4020E-07

S14

1.4729E-02

-3.8550E-03

1.0034E-03

-1.6414E-04

1.8098E-05

-1.4166E-06

8.0591E-08

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.0126E-02

-2.5762E-02

7.7899E-03

-1.6197E-03

2.1986E-04

-1.7511E-05

6.1988E-07

S2

2.1083E-02

-9.1266E-03

2.7417E-03

-5.5928E-04

7.3801E-05

-5.6768E-06

1.9318E-07

S3

-5.9382E-03

2.0371E-03

-4.9214E-04

8.1666E-05

-8.8357E-06

5.5949E-07

-1.5673E-08

S4

7.3414E-05

-1.4073E-05

1.9066E-06

-1.7742E-07

1.0756E-08

-3.8178E-10

6.0107E-12

S5

4.0737E-04

-7.6599E-05

1.0052E-05

-9.0300E-07

5.2973E-08

-1.8294E-09

2.8217E-11

S6

-1.4587E-06

-1.5481E-06

2.4903E-07

-1.9994E-08

9.2505E-10

-2.3453E-11

2.5222E-13

S7

-3.6140E-05

2.1118E-06

2.7977E-08

-1.6124E-08

1.3302E-09

-5.1686E-11

8.2349E-13

S8

-2.8805E-05

4.0100E-06

-3.9197E-07

2.6290E-08

-1.1511E-09

2.9614E-11

-3.3927E-13

S9

2.3441E-07

-1.3389E-08

5.4031E-10

-1.5030E-11

2.7356E-13

-2.9220E-15

1.3822E-17

S10

4.9584E-08

-2.4989E-09

8.3890E-11

-1.7487E-12

1.8347E-14

-6.9532E-18

-1.1905E-18

S11

-5.2008E-08

1.2269E-09

1.9071E-11

-2.4951E-12

8.4104E-14

-1.3673E-15

9.1121E-18

S12

-6.8505E-08

3.0531E-09

-9.5013E-11

1.9821E-12

-2.5496E-14

1.6771E-16

-3.0495E-19

S13

2.7719E-08

-2.3863E-09

1.2662E-10

-4.3750E-12

9.6380E-14

-1.2344E-15

7.0125E-18

S14

-3.3591E-09

1.0227E-10

-2.2432E-12

3.4440E-14

-3.5061E-16

2.1228E-18

-5.7788E-21

TABLE 8

Fig. 27 shows on-axis aberration curves at the time of a long shot of the focusing lens group of example four, which represent the deviation of the convergent focus of light rays of different wavelengths after passing through the focusing lens group. Fig. 28 shows an astigmatism curve at the time of telephoto imaging of the focusing imaging lens group of example four, which represents meridional field curvature and sagittal field curvature. Fig. 29 shows distortion curves at the time of telephoto imaging for the focusing imaging lens group of example four, which represent values of distortion magnitudes corresponding to different angles of view.

Fig. 30 shows an on-axis aberration curve at close-up of the focusing image-capturing lens group of example four, which represents the convergent focus deviation of light rays of different wavelengths after passing through the focusing image-capturing lens group. Fig. 31 shows an astigmatism curve at close-up of the focusing image pickup lens group of example four, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 32 shows distortion curves at close-up of the focusing image pickup lens group of example four, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 27 to 32, the focusing lens group of example four can achieve good image quality.

In summary, the example one to example four satisfy the relationships shown in table 9, respectively.

Conditional formula/example	1	2	3	4
					EPD/∑CT	0.59	0.45	0.55	0.49
TTLi/ImgHi*tan(Semi-FOVi)	1.21	1.55	1.38	1.47
					\|TTLi/ImgHi-TTLm/ImgHm\|	0.09	0.08	0.10	0.05
\|Fg1/fi-Fg1/fm\|	0.02	0.07	0.05	0.01
					fnoi/fnom	1.02	1.08	1.06	0.98
(TDi/TTLi)/(TDm/TTLm)	0.82	0.84	0.89	0.91
					∑ET/∑CT	0.83	0.91	0.88	0.89
ET1/ET7	0.39	0.73	0.24	0.23
					BFLm/∑ATm	0.28	0.32	0.49	0.11
T67m/∑ATm	0.53	0.34	0.50	0.63
					△T/∑CT	0.35	0.30	0.18	0.17
N2+N3+N4	4.89	4.73	4.88	4.75

TABLE 9

Table 10 shows the distance TTLi on the optical axis from the object side surface of the first lens element to the imaging surface in the case of the long shot, the distance TTLm on the optical axis from the object side surface of the first lens element to the imaging surface in the case of the short shot, the half ImgHi of the diagonal length of the effective pixel area on the imaging surface in the case of the long shot, the half ImgHm of the diagonal length of the effective pixel area on the imaging surface in the case of the short shot, and the like.

Watch 10

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 focusing camera 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 lens assembly, comprising, in order from an object side to an image side along an optical axis:

a first lens group having positive optical power;

a second lens group;

the second lens group at least comprises a seventh lens, and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; when the distance between the shot object and the focusing camera lens group is from far to near, adjusting the spacing distance between the first lens group and the second lens group on the optical axis to execute focusing; the entrance pupil diameter EPD of the focusing camera lens group and the sum sigma CT of the thicknesses of the first lens to the seventh lens in the focusing camera lens group on the optical axis respectively satisfy the following conditions: EPD/Sigma CT < 0.8.

2. The focus camera lens group of claim 1, further comprising an aperture stop positioned on the subject side of the second lens.

3. The focus image lens assembly of claim 1, wherein a distance Um between the subject and the subject side surface of the first lens satisfies, at the time of close-up photographing, a distance Um between the subject and the subject side surface of the first lens: the Um is more than or equal to 90mm and less than or equal to 200 mm.

4. The focus image-capturing lens group according to claim 1, wherein a distance TTLi on the optical axis from a subject side surface of the first lens to an imaging surface at the time of telephoto shooting, a half ImgHi of a diagonal length of an effective pixel area on the imaging surface at the time of telephoto shooting, and a half Semi-FOVi of a maximum angle of view of the focus image-capturing lens group at the time of telephoto shooting satisfy: 1< TTLi/ImgHi tan (Semi-FOVi) < 2.

5. The focus camera lens group according to claim 1, wherein a distance TTLi from a subject side surface of the first lens to an imaging surface on the optical axis at the time of a long shot of the focus camera lens group, ImgHi which is a half of a diagonal length of an effective pixel area on the imaging surface at the time of a long shot of the focus camera lens group, TTLm which is a distance from the subject side surface of the first lens to the imaging surface on the optical axis at the time of a close shot of the focus camera lens group, and ImgHm which is a half of a diagonal length of an effective pixel area on the imaging surface at the time of a close shot of the focus camera lens group satisfy: | TTLi/ImgHi-TTLm/ImgHm | < 0.15.

6. The focus camera lens group of claim 1, wherein a focal length Fg1 of the first lens group, a focal length fi of the focus camera lens group at a long shot, and a focal length fm of the focus camera lens group at a close shot satisfy: i Fg1/fi-Fg1/fm | < 0.1.

7. The focus camera lens group according to claim 1, wherein an aperture value fnoi of the focus camera lens group at the time of the long shot and an aperture value fnom of the focus camera lens group at the time of the close shot satisfy: 0.9< fnoi/fnom < 1.2.

8. The focus camera lens group of claim 1, wherein a distance TDm on the optical axis from the object side surface of the first lens element to the image side surface of the seventh lens element when the focus camera lens group is close shot, a distance TTLm on the optical axis from the object side surface of the first lens element to the image side surface of the seventh lens element when the focus camera lens group is close shot, a distance TDi on the optical axis from the object side surface of the first lens element to the image side surface of the seventh lens element when the focus camera lens group is far shot, and a distance TTLi on the optical axis from the object side surface of the first lens element to the image side surface of the focus camera lens group when the focus camera lens group is far shot satisfy: 0.8< (TDi/TTLi)/(TDm/TTLm) <1.

9. The focus camera lens group of claim 1, wherein a sum Σ ET of edge thickness of each lens in the focus camera lens group and a sum Σ CT of thickness on the optical axis of each of the first to fifth lenses in the focus camera lens group satisfy: 0.5< ∑ ET/Σ CT <1.

10. The focus image capturing lens group according to claim 1, wherein an edge thickness ET1 of the first lens and an edge thickness ET7 of the seventh lens satisfy: 0.2< ET1/ET7< 0.8.

11. The focus camera lens group according to claim 1, wherein a distance BFLm between an image side surface of the seventh lens element and an image plane on the optical axis when the focus camera lens group is close-up, and a sum Σ ATm between a distance on the optical axis of an air gap between the first lens element and the seventh lens element when the focus camera lens group is close-up satisfy: BFLm/sigma ATm < 0.5.

12. The focus image lens group according to claim 1, wherein a sum Σ ATm of distances on the optical axis of air gaps between the first lens to the seventh lens in close-up of the focus image lens group and a distance Σ T67m on the optical axis of air gaps between the sixth lens to the seventh lens in close-up of the focus image lens group satisfy: 0.3< T67m/∑ ATm < 0.8.

13. The focus camera lens assembly of claim 1, wherein a difference Δ T between the first lens group and the second lens group in the optical axis and a sum Σ CT of thicknesses of the first lens to the fifth lens of the focus camera lens assembly on the optical axis respectively at close-up and far-up times satisfy: Δ T/Σ CT < 0.5.

14. The focus image capturing lens group of claim 1, wherein the refractive index N2 of the second lens, the refractive index N3 of the third lens, and the refractive index N4 of the fourth lens satisfy: 4.5< N2+ N3+ N4< 5.

15. The focus camera lens assembly of claim 1, wherein the number of lenses V with abbe number greater than 50₅₀Satisfies the following conditions: v₅₀≥2。

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

a first lens group having positive optical power;

a second lens group;

the second lens group at least comprises a seventh lens, and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; when the distance between the shot object and the focusing camera lens group is from far to near, adjusting the spacing distance between the first lens group and the second lens group on the optical axis to execute focusing; when the focusing camera lens group is used for close shooting, the distance Um between the shot object and the shot object side surface of the first lens meets the following requirements: the Um is more than or equal to 90mm and less than or equal to 200 mm.

17. The focusing lens group of claim 16, wherein the entrance pupil diameter EPD of the focusing lens group and the sum Σ CT of the thicknesses of the first to seventh lenses on the optical axis satisfy: EPD/Sigma CT < 0.8; the focusing camera lens group further comprises a diaphragm, and the diaphragm is positioned on the object side of the second lens.

18. The focus camera lens group according to claim 16, wherein a distance TTLi on the optical axis from a subject side surface of the first lens to an imaging surface at the time of telephoto shooting, a half ImgHi of a diagonal length of an effective pixel area on the imaging surface at the time of telephoto shooting, and a half Semi-FOVi of a maximum angle of view of the focus camera lens group at the time of telephoto shooting satisfy: 1< TTLi/ImgHi tan (Semi-FOVi) < 2.

19. The focus camera lens group according to claim 16, wherein a distance TTLi on the optical axis from the object side surface of the first lens to an imaging surface of the focus camera lens group at the time of long shot, ImgHi which is a half of a diagonal length of an effective pixel area on the imaging surface of the focus camera lens group at the time of long shot, a distance TTLm on the optical axis from the object side surface of the first lens to the imaging surface of the focus camera lens group at the time of close shot, and ImgHm which is a half of a diagonal length of an effective pixel area on the imaging surface of the focus camera lens group at the time of close shot satisfy: i TTLi/ImgHi-TTLm/ImgHm I < 0.15.

20. The focus camera lens group of claim 16, wherein a focal length Fg1 of the first lens group, a focal length fi of the focus camera lens group at a long shot, and a focal length fm of the focus camera lens group at a close shot satisfy: i Fg1/fi-Fg1/fm | < 0.1.

21. The focus camera lens group according to claim 16, wherein an aperture value fnoi of the focus camera lens group at the time of the long shot and an aperture value fnom of the focus camera lens group at the time of the close shot satisfy: 0.9< fnoi/fnom < 1.2.

22. The focus camera lens assembly of claim 16, wherein a distance TDm from the object side of the first lens to the image side of the seventh lens on the optical axis when the focus camera lens assembly is close-up, a distance TTLm from the object side of the first lens to the image plane when the focus camera lens assembly is close-up, a distance TDi from the object side of the first lens to the image side of the seventh lens on the optical axis when the focus camera lens assembly is far-up, and a distance TTLi from the object side of the first lens to the image plane when the focus camera lens assembly is far-up satisfy: 0.8< (TDi/TTLi)/(TDm/TTLm) <1.

23. The focus camera lens group of claim 16, wherein the sum of edge thicknesses ∑ ET of the lenses in the focus camera lens group and the sum of thicknesses ∑ CT of the first through fifth lenses in the focus camera lens group on the optical axis satisfy: 0.5< ∑ ET/Σ CT <1.

24. The focus camera lens group of claim 16, wherein an edge thickness ET1 of the first lens and an edge thickness ET7 of the seventh lens satisfy: 0.2< ET1/ET7< 0.8.

25. The focus camera lens group of claim 16, wherein a distance BFLm between an image side surface of the seventh lens and an image plane on the optical axis when the focus camera lens group is close-up, and a sum Σ ATm between a distance on the optical axis of an air gap between the first lens and the seventh lens of the focus camera lens group when the focus camera lens group is close-up satisfy: BFLm/SIGMA ATm < 0.5.

26. The focus camera lens group according to claim 16, wherein a sum Σ ATm of distances on the optical axis of air gaps between the first lens to the seventh lens in close-up of the focus camera lens group and a distance Σ T67m on the optical axis of air gaps between the sixth lens to the seventh lens in close-up of the focus camera lens group satisfy: 0.3< T67m/∑ ATm < 0.8.

27. The focus camera lens assembly of claim 16, wherein a difference Δ T between the first lens assembly and the second lens assembly in the optical axis during close-up and far-up photographing and a sum Σ CT of thicknesses of the first lens to the fifth lens of the focus camera lens assembly on the optical axis respectively satisfy: Δ T/Σ CT < 0.5.

28. The focus camera lens group of claim 16, wherein the refractive index N2 of the second lens, the refractive index N3 of the third lens and the refractive index N4 of the fourth lens satisfy: 4.5< N2+ N3+ N4< 5.

29. The focus camera lens group of claim 16, wherein the abbe number V is greater than 50₅₀Satisfies the following conditions: v₅₀≥2。