CN114326042A

CN114326042A - Moving focusing optical lens group

Info

Publication number: CN114326042A
Application number: CN202210055860.XA
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: 2022-01-18
Filing date: 2022-01-18
Publication date: 2022-04-12
Anticipated expiration: 2042-01-18
Also published as: CN114326042B

Abstract

The invention provides an optical lens group for moving focusing, which sequentially comprises the following components from an object side to an image side of the optical lens group: a diaphragm; a first lens group with positive refractive power, the first lens group at least comprising a first lens and a second lens; a second lens group including at least one lens; when a shot object moves to be close to the optical lens group, adjusting the interval of the first lens group and the second lens group on the optical axis to realize focusing; the difference quantity DeltaT of the interval between the first lens group and the second lens group and the entrance pupil diameter EPD of the optical lens group in the close shooting position and the far shooting position satisfy the following conditions: 0< | delta T |/EPD < 0.8. The invention solves the problem that the zoom optical lens group in the prior art cannot be miniaturized.

Description

Moving focusing optical lens group

Technical Field

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

Background

In recent years, the market demand of smart phones is increasing year by year, smart phones tend to be thinner and thinner, the sizes of parts and groups in products are also required to be reduced along with the continuous improvement of the shooting level of smart phones, and miniaturization is used as one of the main indexes of the mobile phones by all large mobile phone manufacturers. Generally speaking, due to the limitation of space, it is difficult for a miniaturized lens to satisfy the requirements of both close-up and far-up, and it is also a challenge for the optical engineers how to focus more quickly with the development of the lens.

That is, the zoom optical lens group in the related art has a problem that it cannot be miniaturized.

Disclosure of Invention

The invention mainly aims to provide a moving focusing optical lens group to solve the problem that the focusing optical lens group in the prior art cannot be miniaturized.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical lens group for moving focus, comprising, in order from an object side to an image side of the optical lens group: a diaphragm; a first lens group with positive refractive power, the first lens group at least comprising a first lens and a second lens; a second lens group including at least one lens; when a shot object moves to be close to the optical lens group, adjusting the interval of the first lens group and the second lens group on the optical axis to realize focusing; the difference quantity DeltaT of the interval between the first lens group and the second lens group and the entrance pupil diameter EPD of the optical lens group in the close shooting position and the far shooting position satisfy the following conditions: 0< | delta T |/EPD < 0.8.

Further, the optical lens group has six lenses.

Further, the distance TDi between the object side surface of the first lens and the image side surface of the fifth lens on the optical axis when the optical lens group is at the telephoto position and the focal length fi when the optical lens group is at the telephoto position satisfy: 0.7< TDi/fi <1.

Further, a distance TDi from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis when the optical lens group is in the telephoto position, a distance TLi from the object side surface of the first lens to the imaging surface of the optical lens group on the optical axis when the optical lens group is in the telephoto position, and a distance BLi from the image side surface of the sixth lens to the imaging surface when the optical lens group is in the telephoto position on the optical axis satisfy: 0< BLi/TDi-BLi/TLi < 0.1.

Further, a distance TDm on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens when the optical lens group is in the close-up position, a distance TLm on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group when the optical lens group is in the close-up position, and a distance BLm on the optical axis from the image side surface of the sixth lens to the imaging surface when the optical lens group is in the close-up position satisfy: 0< BLm/TDm-BLm/TLm < 0.3.

Further, a radius of curvature R2 of the image-side surface of the first lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: -0.8< R6/R2< 0.

Further, a radius of curvature R10 of the image-side surface of the fifth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0< R10/R12< 0.5.

Further, a maximum center thickness CTmax of the lenses in the optical lens group and a sum Σ CT of center thicknesses of the first to fifth lenses in the optical lens group on the optical axis of the optical lens group, respectively, satisfy: 0.2< CTmax/Σ CT < 0.5.

Further, when the optical lens group is in the close-up position, the distance Um between the object and the object side surface of the first lens satisfies: um is more than or equal to 10mm and less than or equal to 80 mm.

Further, a distance TLi on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the telephoto position of the optical lens group, and a distance TLm on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the telephoto position of the optical lens group satisfy: l TLm-TLi l <0.3 mm.

Further, the half ImgHm of the diagonal length of the effective pixel region on the imaging surface of the optical lens group at the close-up position, the aperture value fnom of the optical lens group at the close-up position, the half ImgHi of the diagonal length of the effective pixel region on the imaging surface of the optical lens group at the far-up position, the aperture value fnoi of the optical lens group at the far-up position satisfy: 0< ImgHm/fnom-ImgHi/fnoi < 0.5.

Further, a half of the maximum angle of view Semi-FOVi of the optical lens group at the telephoto position and a half of the maximum angle of view Semi-FOVm of the optical lens group at the close-up position satisfy: 0.8< TAN (Semi-FOVi)/TAN (Semi-FOvm) < 1.2.

Further, the half ImgHm of the diagonal length of the effective pixel area on the imaging surface of the optical lens group in the close-up position and the half ImgHi of the diagonal length of the effective pixel area on the imaging surface of the optical lens group in the far-out position satisfy: 0 is less than or equal to (ImgHi-ImgHm)/[ delta ] T is less than 0.5.

Further, a focal length Fg1 of the first lens group and a focal length Fg2 of the second lens group satisfy: 0.5< | Fg1|/| Fg2| < 1.5.

Further, a maximum edge thickness ETmax of the lenses in the optical lens group and a sum Σ ET of the edge thicknesses of all the lenses in the optical lens group satisfy: 0.2< ETmax/Σ ET < 0.5.

Further, a maximum edge thickness ETmax of a lens in the optical lens group and a minimum edge thickness ETmin of a lens in the optical lens group are satisfied: 0< ETmin/ETmax < 0.6.

Further, the number V30 of lenses having an abbe number of more than 30 is 3 or more.

Further, the abbe number V2 of the second lens and the abbe number V4 of the fourth lens satisfy: 0.7< V2/V4< 1.2.

According to another aspect of the present invention, there is provided an optical lens group for moving focus, comprising, in order from an object side to an image side of the optical lens group: a diaphragm; a first lens group with positive refractive power, the first lens group at least comprising a first lens and a second lens; a second lens group including at least one lens; when a shot object moves to be close to the optical lens group, adjusting the interval of the first lens group and the second lens group on the optical axis to realize focusing; the distance TLi of the optical lens group on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the long-shot position and the distance TLm of the optical lens group on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the long-shot position satisfy: l TLm-TLi l <0.3 mm.

Further, the optical lens group has six lenses.

By applying the technical scheme of the invention, the moving focusing optical lens group sequentially comprises a diaphragm, a first lens group with positive refractive power and a second lens group along the object side to the image side of the optical lens group, and the first lens group at least comprises a first lens and a second lens; the second lens group includes at least one lens; when a shot object moves to be close to the optical lens group, adjusting the interval of the first lens group and the second lens group on the optical axis to realize focusing; the difference quantity DeltaT of the interval between the first lens group and the second lens group and the entrance pupil diameter EPD of the optical lens group in the close shooting position and the far shooting position satisfy the following conditions: 0< | delta T |/EPD < 0.8.

By controlling the distance between the first lens group and the second lens group, long-distance shooting and close-distance shooting can be realized, the working stroke of a motor during focusing is reduced, and the miniaturization of the optical lens group is ensured. In addition, 0< | Delta T |/EPD <0.8 is satisfied, the miniaturization of the optical lens group is ensured, meanwhile, the optical lens group has enough luminous flux to ensure that the image surface has higher illumination, and excellent imaging quality is maintained under the environment of close-up shooting or weak light energy.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. 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, respectively, of the optical lens group in fig. 1;

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

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, respectively, of the optical lens group in fig. 11;

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 optical lens group 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 optical lens group 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 optical lens group 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;

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

fig. 37 to 40 show an on-axis chromatic aberration curve, a chromatic aberration of magnification curve, an astigmatism curve, and a distortion curve, respectively, of the optical lens group 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 chromatic aberration of magnification curve, an astigmatism curve, and a distortion curve, respectively, of the optical lens group in fig. 41;

fig. 47 to 50 show an on-axis chromatic aberration curve, a chromatic aberration of magnification curve, an astigmatism curve, and a distortion curve, respectively, of the optical lens group in fig. 42; 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, optical filters; s13, the object side surface of the optical filter; s14, the image side surface of the filter plate; and S15, 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 invention.

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

In the drawings, the thickness, size, and shape of the 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 surface of the lens facing the light inlet side, and the surface of each lens close to the image side is called the surface of the lens facing the light outlet side. 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 recent years, the market demand of smart phones has increased year by year, the shooting level of smart phones has been improved, the sizes of parts and assemblies in products have to be reduced, and the miniaturization of large mobile phone manufacturers is one of the main indicators of mobile phones. Generally speaking, due to the limitation of space, it is difficult for a miniaturized lens to satisfy the requirements of both close-up and far-up, and it is also a challenge for the optical engineers how to focus more quickly with the development of the lens.

In addition, in general, a lens having a focusing and focusing function may be focused by using a software method, such as extending a depth of field to achieve a focusing effect; or a voice coil motor is utilized to achieve the focusing effect; however, the above two methods have problems of reduced image quality and excessive power consumption, respectively.

Therefore, there is a need for a mobile focusing optical lens assembly suitable for light and thin portable electronic products with good imaging quality and low power consumption. The invention provides a moving focusing optical lens group, which has excellent light converging capability, can meet the long-range shooting effect and simultaneously ensure the close-range shooting effect, has the advantage of faster long-range and close-range switching, can keep clear imaging capability on a distant object in the actual shooting process, can ensure enough imaging light to enter an optical system in close-range shooting, reduces the noise of an imaging picture, and improves the imaging effect of close-range shooting.

The invention provides an optical lens group for moving focusing, aiming at solving the problem that the zooming optical lens group in the prior art cannot be miniaturized.

Example one

As shown in fig. 1 to fig. 50, the focusing moving optical lens assembly includes, in order from an object side to an image side of the optical lens assembly, a stop, a first lens assembly with positive refractive power, and a second lens assembly, where the first lens assembly includes at least a first lens and a second lens; the second lens group includes at least one lens; when a shot object moves to be close to the optical lens group, adjusting the interval of the first lens group and the second lens group on the optical axis to realize focusing; the difference quantity DeltaT of the interval between the first lens group and the second lens group and the entrance pupil diameter EPD of the optical lens group in the close shooting position and the far shooting position satisfy the following conditions: 0< | delta T |/EPD < 0.8.

Preferably, the difference amount Δ T of the interval between the first lens group and the second lens group in the close-up position and the far-up position of the optical lens group, the entrance pupil diameter EPD of the optical lens group satisfy between: 0.1< | Δ T |/EPD < 0.7.

In the present embodiment, the optical lens group has six lenses. The six lenses with the optical power can obtain higher resolving power, larger aperture, smaller imaging distance and larger magnification in close-up shooting under the condition of the same structural size.

In this embodiment, a distance TDi from the object-side surface of the first lens to the image-side surface of the fifth lens on the optical axis in the telephoto position and a focal length fi of the optical lens group in the telephoto position satisfy: 0.7< TDi/fi <1. The distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis can be obtained on the premise of keeping the telephoto effect by reasonably controlling the focal length of the optical lens group at the telephoto position and the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis at the telephoto position, so that more space is provided for the structural part, the forming debugging process space is larger, the appearance problem of the lenses is avoided, and the mixed light risk is caused, and the CRA can be better matched with the chip. Preferably, 0.7< TDi/fi < 0.98.

In this embodiment, a distance TDi from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis when the optical lens group is in the telephoto position, a distance TLi from the object side surface of the first lens to the imaging surface of the optical lens group on the optical axis when the optical lens group is in the telephoto position, and a distance BLi from the image side surface of the sixth lens to the imaging surface when the optical lens group is in the telephoto position on the optical axis satisfy: 0< BLi/TDi-BLi/TLi < 0.1. Set up like this and can obtain comparatively reasonable back burnt value, prevent that the module end that burnt too big or undersize in back from causing is bad, guarantee simultaneously that back burnt space is great give far and near enough motor working stroke when switching. Preferably, 0.01< BLi/TDi-BLi/TLi < 0.1.

In this embodiment, a distance TDm between the object side surface of the first lens and the image side surface of the fifth lens on the optical axis when the optical lens group is in the close-up position, a distance TLm between the object side surface of the first lens and the imaging surface of the optical lens group on the optical axis when the optical lens group is in the close-up position, and a distance BLm between the image side surface of the sixth lens and the imaging surface when the optical lens group is in the close-up position satisfy: 0< BLm/TDm-BLm/TLm < 0.3. The rear focal length can be reasonably obtained by the arrangement, the defect of a module end caused by overlarge or undersize rear focal length is prevented, the difference between the last lens and the front five lenses is not overlarge, and the problems of stray light, poor forming and the like are avoided. Preferably, 0< BLm/TDm-BLm/TLm < 0.26.

In the present embodiment, a radius of curvature R2 of the image-side surface of the first lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: -0.8< R6/R2< 0. The curvature radius of the image side surface of the first lens and the curvature radius of the image side surface of the third lens are reasonably controlled, the problem of processing difficulty caused by overlarge inclination angle is avoided, the spherical aberration of the optical lens group can be effectively balanced by the two lenses, the sensitivity of the two lenses is reduced, better convergence of external light is ensured, and a larger aperture is obtained. Preferably, -0.78< R6/R2< -0.2.

In the present embodiment, a radius of curvature R10 of the image-side surface of the fifth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0< R10/R12< 0.5. The curvature radius of the image side surface of the fifth lens and the curvature radius of the image side surface of the sixth lens are reasonably controlled, the problem of processing difficulty caused by overlarge inclination angle is avoided, the two rear lenses have great influence on the stability of the whole optical lens group, meanwhile, the two rear lenses in the telephoto optical lens group easily cause chip ghost images, and the phenomenon that the ghost images are too strong to influence the actual imaging quality is avoided. Preferably 0.05< R10/R12< 0.48.

In the present embodiment, a maximum center thickness CTmax of the lenses in the optical lens group and a sum Σ CT of center thicknesses of the first to fifth lenses in the optical lens group, respectively, on the optical axis of the optical lens group satisfy: 0.2< CTmax/Σ CT < 0.5. The ratio of the maximum central thickness to the sum of the thicknesses of the first lens to the fifth lens on the optical axis is reasonably distributed, so that the manufacturability of each lens can be ensured, and better diopter can be obtained, thereby improving the whole imaging quality and obtaining better resolving power. Preferably, 0.22< CTmax/Σ CT < 0.48.

In this embodiment, when the optical lens group is in the close-up position, the distance Um between the object and the object-side surface of the first lens satisfies: um is more than or equal to 10mm and less than or equal to 80 mm. The optical lens group can realize clear imaging under an ultra-short distance of 10mm-80mm, meets the requirements of users on micro-distance performance, and is suitable for wider life scenes.

In this embodiment, a distance TLi on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the telephoto position, and a distance TLm on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the telephoto position satisfy: l TLm-TLi l <0.3 mm. The total length of the optical lens group is close when the remote shooting position and the close shooting position are controlled, the optical lens group is ensured not to be installed disadvantageously when the module is assembled, and the second lens group is ensured not to interfere with the module end when the remote shooting position and the close shooting position are controlled. Preferably, | TLm-TLi | <0.29 mm.

In this embodiment, the half ImgHm of the diagonal length of the effective pixel region on the imaging surface of the optical lens group at the close-up position, the aperture value fnom of the optical lens group at the close-up position, the half ImgHi of the diagonal length of the effective pixel region on the imaging surface of the optical lens group at the far-up position, and the aperture value fnoi of the optical lens group at the far-up position satisfy: 0< ImgHm/fnom-ImgHi/fnoi < 0.5. Half of the diagonal length of the effective pixel area on the imaging surface is guaranteed to be larger in aperture and more in light-entering amount when the image is close to the close-shot position under the condition that the far-shot position is close to the close-shot position, so that the problem that the scene is too dark due to too close shooting distance is solved, and the imaging quality of the optical lens group is effectively guaranteed. Preferably, 0.01< ImgHm/fnom-ImgHi/fnoi < 0.45.

In the present embodiment, the half Semi-FOVi of the maximum angle of view of the optical lens group at the telephoto position and the half Semi-FOVm of the maximum angle of view of the optical lens group at the close-up position satisfy: 0.8< TAN (Semi-FOVi)/TAN (Semi-FOvm) < 1.2. The difference between the maximum field angle at the far shooting position and the maximum field angle at the near shooting position is reasonably controlled, the picture change is small when the distance and the near are switched, more detailed information of shot scenery is presented, and the user experience is improved. Preferably, 0.85< TAN (Semi-FOVi)/TAN (Semi-FOVm) < 1.18.

In this embodiment, ImgHm, which is half the diagonal length of the effective pixel area on the imaging surface of the optical lens group in the close-up position, and ImgHi, which is half the diagonal length of the effective pixel area on the imaging surface of the optical lens group in the far-out position, satisfy: 0 is less than or equal to (ImgHi-ImgHm)/[ delta ] T is less than 0.5. The ratio of the image height difference between the far shooting position and the close shooting position to the difference between the first lens group and the second lens group at the interval on the optical axis between the close shooting position and the far shooting position is controlled to be smaller, so that the image surface sizes are approximately equal under different object distances, the picture change is smaller when the far and near switching is ensured, more detailed information of shot objects is presented, and the user experience is improved. Preferably, 0 ≦ (ImgHi-ImgHm)/. DELTA.T < 0.49.

In the present embodiment, a focal length Fg1 of the first lens group and a focal length Fg2 of the second lens group satisfy: 0.5< | Fg1|/| Fg2| < 1.5. The effective focal length of the first lens group and the second lens group is reasonably distributed, so that the distortion and astigmatism problems of the whole optical lens group can be better balanced, and a larger image plane can be acquired and higher imaging quality can be achieved. Preferably, 0.52< | Fg1|/| Fg2| < 1.45.

In this embodiment, the maximum edge thickness ETmax of the lenses in the optical lens group and the sum Σ ET of the edge thicknesses of all the lenses in the optical lens group satisfy: 0.2< ETmax/Σ ET < 0.5. The ratio of the maximum edge thickness in the optical lens group to the sum of the edge thicknesses of the lenses is reasonably controlled, so that the chromatic aberration of the whole optical lens group can be better balanced, the difficulty of an actual processing process is avoided, the deformation in the assembling process is prevented, and the stability of field curvature is greatly facilitated. Preferably, 0.21< ETmax/Σ ET < 0.45.

In this embodiment, the maximum edge thickness ETmax of the lenses in the optical lens group and the minimum edge thickness ETmin of the lenses in the optical lens group satisfy: 0< ETmin/ETmax < 0.6. The ratio of the maximum edge thickness to the minimum edge thickness is reasonably controlled, so that the processing and assembling process of the lens is ensured, and the problems that the actual debugging is difficult and the lens is easy to deform in the assembling process due to the fact that the lens is too thin or too thick are avoided, so that the quality of the optical lens group is influenced; on the other hand, the more uniform thickness distribution of the optical lens group is beneficial to meeting the reliability requirement. Preferably, 0.05< ETmin/ETmax < 0.58.

In the present embodiment, the number V30 of lenses having an abbe number greater than 30 is 3 or greater. The number of the lenses with the Abbe number larger than 30 in the optical lens group is ensured to be certain, so that the chromatic dispersion is small, meanwhile, the lower refractive index caused by the high-Abbe number lens can be matched with the high-refraction lens, the aberration can be better eliminated, and the imaging quality of the optical lens group is ensured.

In the present embodiment, the abbe number V2 of the second lens and the abbe number V4 of the fourth lens satisfy: 0.7< V2/V4< 1.2. The abbe numbers of the second lens and the fourth lens are close, and the lenses with large abbe number difference are arranged at intervals, so that chromatic aberration can be eliminated better, and the imaging quality is improved. Preferably, 0.72< V2/V4< 1.18.

Example two

As shown in fig. 1 to fig. 50, the focusing moving optical lens assembly includes, in order from an object side to an image side of the optical lens assembly, a stop, a first lens assembly with positive refractive power, and a second lens assembly, where the first lens assembly includes at least a first lens and a second lens; the second lens group includes at least one lens; when a shot object moves to be close to the optical lens group, adjusting the interval of the first lens group and the second lens group on the optical axis to realize focusing; the distance TLi of the optical lens group on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the long-shot position and the distance TLm of the optical lens group on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the long-shot position satisfy: l TLm-TLi l <0.3 mm.

By controlling the distance between the first lens group and the second lens group, long-distance shooting and close-distance shooting can be realized, the working stroke of a motor during focusing is reduced, and the miniaturization of the optical lens group is ensured. The total length of the optical lens group is close when the remote shooting position and the close shooting position are controlled, the optical lens group is ensured not to be installed disadvantageously when the module is assembled, and the second lens group is ensured not to interfere with the module end when the remote shooting position and the close shooting position are controlled.

Preferably, a distance TLi on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the telephoto position, and a distance TLm on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the telephoto position satisfy: l TLm-TLi l <0.29 mm.

In the present embodiment, a radius of curvature R10 of the image-side surface of the fifth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0< R10/R12< 0.5. The curvature radius of the image side surface of the fifth lens and the curvature radius of the image side surface of the sixth lens are reasonably controlled, the problem of processing difficulty caused by overlarge inclination angle is avoided, the two rear lenses have great influence on the stability of the whole optical lens group, meanwhile, the two rear lenses of the long-focus system easily cause chip ghost images, and the phenomenon that the ghost images are too strong to influence the actual imaging quality is avoided. Preferably 0.05< R10/R12< 0.48.

In the present embodiment, the half Semi-FOVi of the maximum angle of view of the optical lens group at the telephoto position and the half Semi-FOVm of the maximum angle of view of the optical lens group at the close-up position satisfy: 0.8< TAN (Semi-FOVi)/TAN (Semi-FOvm) < 1.2. The difference between the maximum field angle at the far shooting position and the maximum field angle at the near shooting position is reasonably controlled, the picture change is small when the distance and the near are switched, more detailed information of shot scenery is presented, and the user experience is improved. Preferably, 0.85< TAN (Semi-FOVi)/TAN (Semi-FOVm) < 1.18. In this embodiment, ImgHm, which is half the diagonal length of the effective pixel area on the imaging surface of the optical lens group in the close-up position, and ImgHi, which is half the diagonal length of the effective pixel area on the imaging surface of the optical lens group in the far-out position, satisfy: 0 is less than or equal to (ImgHi-ImgHm)/[ delta ] T is less than 0.5. The ratio of the image height difference between the far shooting position and the close shooting position to the difference between the first lens group and the second lens group at the interval on the optical axis between the close shooting position and the far shooting position is controlled to be smaller, so that the image surface sizes are approximately equal under different object distances, the picture change is smaller when the far and near switching is ensured, more detailed information of shot objects is presented, and the user experience is improved. Preferably, 0 ≦ (ImgHi-ImgHm)/. DELTA.T < 0.49.

Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.

The optical imaging system in the present application may employ a plurality of lenses, such as the six lenses described above. By reasonably distributing the refractive power, the surface shape, the central thickness of each lens, the on-axis distance between each lens and the like, the aperture of the optical imaging system 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 imaging system is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones.

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 making up the optical imaging system can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the optical imaging system is not limited to including six lenses. The optical imaging system may also include other numbers of lenses, as desired.

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

It should be noted that any one of the following examples one to five 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 E7, and an image plane S15. Wherein the first lens group G1 includes a stop STO, a first lens E1, a second lens E2; the second lens group G2 includes a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

The first lens group G1 has positive power, and the second lens group G1 has negative power; the first lens E1 has positive focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is convex; the second lens E2 has negative focal 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 negative focal 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 positive focal 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 negative focal 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 positive refractive 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 E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 1 shows a basic structural parameter table of the optical lens group of example one, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius are all millimeters (mm), infinity is an optical lens group in the far-shooting position in the left column in the thickness column, 80mm is an optical lens group in the close-shooting position in the right column in the thickness column, and the distance between the subject and the optical lens group is 80 mm.

TABLE 1

In the first example, the object-side surface and the image-side surface of any one of the first lens element E1 through the sixth lens element E6 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 A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30, which can be used for each of the aspherical mirrors S1-S12 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-8.6415E-04

-4.5079E-03

1.5916E-02

-3.3725E-02

4.2599E-02

-3.4059E-02

1.7417E-02

S2

2.4367E-02

2.5013E-02

-1.6395E-01

5.4648E-01

-1.1737E+00

1.6887E+00

-1.6609E+00

S3

1.0912E-01

-7.4445E-02

2.9057E-01

-1.1440E+00

2.9369E+00

-4.8505E+00

5.0053E+00

S4

9.9548E-02

-6.7538E-03

-1.8552E-01

1.3923E+00

-5.9006E+00

1.6364E+01

-3.1094E+01

S5

-3.3112E-02

2.3664E-02

1.0582E-02

-3.7579E-01

2.2422E+00

-7.6722E+00

1.7053E+01

S6

-6.0985E-02

9.0545E-02

-5.9243E-01

3.2636E+00

-1.2427E+01

3.2677E+01

-6.0187E+01

S7

-5.0264E-02

6.6690E-03

-3.5429E-02

-9.5788E-03

2.8464E-01

-7.9609E-01

1.1165E+00

S8

-4.6864E-02

1.9100E-02

-6.6788E-02

1.4983E-01

-2.1008E-01

1.8088E-01

-9.4492E-02

S9

-1.3297E-01

1.3965E-01

-2.1714E-01

1.9881E-01

-8.3424E-02

-2.4648E-02

5.9229E-02

S10

-2.4286E-01

3.0452E-01

-3.6566E-01

3.3352E-01

-2.2789E-01

1.1587E-01

-4.3647E-02

S11

-1.3589E-01

1.2248E-01

-3.4267E-02

-3.1804E-02

3.9472E-02

-2.1473E-02

7.3245E-03

S12

-6.3176E-02

2.9875E-02

4.7359E-04

-1.0467E-02

7.9729E-03

-3.5688E-03

1.1135E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-5.6341E-03

1.1267E-03

-1.4566E-04

1.6213E-05

-1.4772E-06

0.0000E+00

S2

1.1198E+00

-5.0895E-01

1.4904E-01

-2.5386E-02

1.9102E-03

0.0000E+00

S3

-2.7079E+00

-1.8432E-01

1.4936E+00

-1.1665E+00

4.6332E-01

-9.7908E-02

8.7556E-03

S4

4.1305E+01

-3.8370E+01

2.4440E+01

-1.0173E+01

2.4925E+00

-2.7263E-01

0.0000E+00

S5

-2.5628E+01

2.6294E+01

-1.8156E+01

8.0662E+00

-2.0814E+00

2.3685E-01

0.0000E+00

S6

7.8102E+01

-7.0967E+01

4.4153E+01

-1.7909E+01

4.2655E+00

-4.5253E-01

0.0000E+00

S7

-9.0871E-01

4.3318E-01

-1.1178E-01

1.1984E-02

0.0000E+00

S8

2.8408E-02

-4.1884E-03

1.8343E-04

0.0000E+00

S9

-4.1787E-02

1.7521E-02

-4.8223E-03

8.8151E-04

-1.0338E-04

7.0535E-06

-2.1315E-07

S10

1.2156E-02

-2.5001E-03

3.7765E-04

-4.1185E-05

3.1044E-06

-1.4591E-07

3.2287E-09

S11

-1.7100E-03

2.8171E-04

-3.2869E-05

2.6667E-06

-1.4341E-07

4.6043E-09

-6.6881E-11

S12

-2.5412E-04

4.2714E-05

-5.2082E-06

4.4581E-07

-2.5289E-08

8.5106E-10

-1.2836E-11

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 E7, and an image plane S15. Wherein the first lens group G1 includes a stop STO, a first lens E1, a second lens E2; the second lens group G2 includes a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

The first lens group G1 has positive power, and the second lens group G1 has negative power; the first lens E1 has positive focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is convex; the second lens E2 has negative focal 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 negative focal power, the object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is concave; the fourth lens E4 has positive focal 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 negative focal 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 negative refractive power, and has a concave object-side surface S11 and a concave image-side surface S12. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 3 shows a basic structural parameter table of the optical lens group of example two, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius are all millimeters (mm), infinity is an optical lens group in the far-end position in the left column in the thickness column, 80mm is an optical lens group in the close-end position in the right column in the thickness column, and the distance between the subject and the optical lens group is 80 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

S1

-2.9501E-03

1.4245E-03

-6.2422E-03

9.0952E-03

-4.8204E-03

-6.4641E-03

1.3366E-02

S2

6.2515E-03

-2.0845E-02

1.0284E-01

-1.0138E-01

-6.8633E-02

1.9914E-01

-1.6720E-01

S3

4.3681E-02

-3.3462E-02

2.6127E-01

-1.1447E+00

3.7648E+00

-8.7507E+00

1.3939E+01

S4

6.1126E-02

-7.6057E-02

4.1552E-01

-1.1032E+00

8.6998E-01

3.5079E+00

-1.3096E+01

S5

2.5281E-02

-8.2538E-02

3.8620E-01

-1.4032E+00

3.6867E+00

-6.7551E+00

8.6736E+00

S6

5.8171E-03

-2.6025E-02

2.9181E-02

-1.7024E-02

5.7352E-03

-1.1463E-03

1.2828E-04

S7

-6.2115E-02

9.0121E-02

-2.5668E-01

4.7857E-01

-5.7607E-01

3.7858E-01

-4.2647E-02

S8

-7.4700E-02

8.9425E-02

-1.7011E-01

2.6118E-01

-2.9474E-01

2.3201E-01

-1.2311E-01

S9

-1.1230E-01

1.0809E-01

-1.5773E-01

1.4985E-01

-6.3795E-02

-3.3591E-02

7.1582E-02

S10

-8.0593E-02

8.4586E-02

-9.5819E-02

7.5587E-02

-4.3034E-02

1.7977E-02

-5.4707E-03

S11

-1.2379E-05

4.5772E-07

7.4546E-09

0.0000E+00

S12

7.7520E-03

-2.1250E-02

1.3837E-02

-4.9877E-03

1.1402E-03

-1.7448E-04

1.8292E-05

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.0384E-02

4.1934E-03

-8.6168E-04

7.0405E-05

0.0000E+00

S2

7.5512E-02

-2.0070E-02

3.0184E-03

-2.0307E-04

0.0000E+00

S3

-1.5358E+01

1.1812E+01

-6.3195E+00

2.3018E+00

-5.4352E-01

7.4914E-02

-4.5700E-03

S4

2.1894E+01

-2.2011E+01

1.4019E+01

-5.5469E+00

1.2456E+00

-1.2133E-01

0.0000E+00

S5

-7.8307E+00

4.9347E+00

-2.1209E+00

5.9182E-01

-9.6576E-02

6.9922E-03

0.0000E+00

S6

-6.2529E-06

0.0000E+00

S7

-1.3583E-01

1.0898E-01

-3.5542E-02

4.4249E-03

0.0000E+00

S8

4.1345E-02

-7.7271E-03

5.6486E-04

1.1261E-05

0.0000E+00

S9

-5.3297E-02

2.3451E-02

-6.6354E-03

1.2169E-03

-1.3940E-04

9.0163E-06

-2.4900E-07

S10

1.1922E-03

-1.8192E-04

1.8820E-05

-1.2493E-06

4.7714E-08

-7.9137E-10

0.0000E+00

S11

0.0000E+00

S12

-1.3223E-06

6.5274E-08

-2.1267E-09

4.1962E-11

-3.8897E-13

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 E7, and an image plane S15. Wherein the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, a third lens E3; the second lens group G2 includes a fourth lens E4, a fifth lens E5, and a sixth lens E6.

The first lens group G1 has positive power, and the second lens group G1 has negative power; the first lens E1 has positive focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave; the second lens E2 has negative focal 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 positive focal 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 positive focal power, the object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex; the fifth lens E5 has negative power, the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is concave; the sixth lens element E6 has negative refractive power, and has a concave object-side surface S11 and a concave image-side surface S12. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 5 shows a basic structural parameter table of the optical lens group of example three, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius are all millimeters (mm), infinity is an optical lens group in the far-shooting position in the left column in the thickness column, 30mm is an optical lens group in the close-shooting position in the right column in the thickness column, and the distance between the subject and the optical lens group is 30 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

-7.6856E-03

1.9634E-03

-3.5291E-03

5.4521E-03

-6.5106E-03

5.0739E-03

-2.3756E-03

S2

-4.5818E-02

3.6995E-02

-3.6748E-02

1.1018E-01

-3.2171E-01

5.8300E-01

-6.8171E-01

S3

-5.8687E-02

1.4721E-02

9.3689E-02

-2.3743E-01

3.0171E-01

-2.3272E-01

1.1313E-01

S4

-1.5937E-02

-3.2132E-01

1.2254E+00

-2.2485E+00

1.9667E+00

3.4210E-02

-2.0547E+00

S5

2.2050E-02

-3.5459E-01

1.1959E+00

-1.8956E+00

9.2282E-01

1.8126E+00

-4.0398E+00

S6

5.3894E-04

-1.2602E-03

-1.3319E-02

8.4384E-02

-2.1664E-01

3.2923E-01

-3.2188E-01

S7

1.5078E-02

3.9755E-03

-3.6190E-02

1.7240E-01

-5.2898E-01

1.1029E+00

-1.6231E+00

S8

5.8115E-03

-6.1800E-04

3.1160E-02

-9.1941E-02

1.5460E-01

-2.0741E-01

2.6085E-01

S9

-4.3671E-02

6.3225E-02

-3.7225E-01

1.7281E+00

-5.3855E+00

1.1529E+01

-1.7484E+01

S10

-4.1965E-02

4.6417E-04

7.7389E-02

-2.6424E-01

5.8120E-01

-9.0719E-01

1.0255E+00

S11

-8.4796E-14

1.7188E-12

-1.5183E-11

7.5014E-11

-2.3388E-10

4.9308E-10

-7.3120E-10

S12

0.0000E+00

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.0043E-04

-5.9815E-05

-1.1357E-06

0.0000E+00

S2

5.3866E-01

-2.9303E-01

1.0914E-01

-2.6966E-02

4.1199E-03

-3.3418E-04

9.4815E-06

S3

-3.3911E-02

5.7336E-03

-4.1904E-04

0.0000E+00

S4

2.4844E+00

-1.6378E+00

6.9060E-01

-1.9188E-01

3.4243E-02

-3.5812E-03

1.6781E-04

S5

4.0058E+00

-2.4513E+00

9.9258E-01

-2.6772E-01

4.6428E-02

-4.6956E-03

2.1092E-04

S6

2.0780E-01

-8.8083E-02

2.3571E-02

-3.6075E-03

2.4038E-04

0.0000E+00

S7

1.7200E+00

-1.3191E+00

7.2547E-01

-2.7876E-01

7.0986E-02

-1.0753E-02

7.3260E-04

S8

-2.9083E-01

2.4983E-01

-1.5170E-01

6.1955E-02

-1.6097E-02

2.3955E-03

-1.5507E-04

S9

1.9111E+01

-1.5110E+01

8.5567E+00

-3.3792E+00

8.8251E-01

-1.3675E-01

9.5050E-03

S10

-8.4380E-01

5.0359E-01

-2.1508E-01

6.3929E-02

-1.2538E-02

1.4566E-03

-7.5829E-05

S11

7.7805E-10

-5.9716E-10

3.2776E-10

-1.2543E-10

3.1774E-11

-4.7865E-12

3.2451E-13

S12

0.0000E+00

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 E7, and an image plane S15. 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; the second lens group G2 includes a fifth lens E5 and a sixth lens E6.

The first lens group G1 has positive power, and the second lens group G1 has negative power; the first lens E1 has positive focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is convex; the second lens E2 has negative focal power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave; the third lens E3 has negative focal power, the object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is concave; the fourth lens E4 has positive focal 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 positive focal power, 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 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 filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 7 shows a basic structural parameter table of the optical lens group of example four, in which the units of the curvature radius, thickness/distance, focal length, and effective radius are all millimeters (mm), the left column infinity in the thickness column is that the optical lens group is in the far-beat position, and the right column 26mm in the thickness column is that the optical lens group is in the close-beat position, and the distance between the subject and the optical lens group is 26 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

-2.4453E-03

8.4861E-03

-3.4676E-02

8.1172E-02

-1.3006E-01

1.4747E-01

-1.2086E-01

S2

5.6688E-03

6.7030E-02

-2.4822E-01

5.3277E-01

-7.8690E-01

8.2936E-01

-6.3889E-01

S3

-1.1726E-01

1.8236E-01

-5.0110E-01

1.0862E+00

-1.6917E+00

1.8535E+00

-1.4252E+00

S4

-8.0918E-02

1.1826E-01

-3.4325E-01

8.7327E-01

-1.6771E+00

2.3175E+00

-2.3073E+00

S5

7.2850E-03

-3.4651E-02

2.2681E-01

-7.7232E-01

1.7981E+00

-2.9735E+00

3.5309E+00

S6

-9.5080E-03

-1.7360E-02

2.0991E-01

-6.5832E-01

1.2826E+00

-1.6051E+00

1.2352E+00

S7

1.1721E-01

-1.3343E-01

3.1639E-01

-9.8059E-01

2.3871E+00

-4.0046E+00

4.3808E+00

S8

1.2013E-01

-1.2342E-01

3.9285E-01

-1.8654E+00

6.5654E+00

-1.5894E+01

2.6894E+01

S9

-1.0728E-02

-5.1758E-02

3.7500E-01

-1.7141E+00

5.1419E+00

-1.0607E+01

1.5505E+01

S10

-1.7446E-02

-2.1585E-02

1.1172E-01

-3.5947E-01

7.4606E-01

-1.0440E+00

1.0123E+00

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

7.2156E-02

-3.1262E-02

9.6835E-03

-2.0823E-03

2.9437E-04

-2.4536E-05

9.1120E-07

S2

3.6715E-01

-1.5880E-01

5.1236E-02

-1.1956E-02

1.8996E-03

-1.8297E-04

8.0247E-06

S3

7.7494E-01

-2.9997E-01

8.2605E-02

-1.5979E-02

2.0971E-03

-1.7125E-04

6.7121E-06

S4

1.6854E+00

-9.1325E-01

3.6482E-01

-1.0445E-01

2.0226E-02

-2.3634E-03

1.2539E-04

S5

-3.0258E+00

1.8744E+00

-8.3385E-01

2.6060E-01

-5.4472E-02

6.8515E-03

-3.9250E-04

S6

-4.6298E-01

-7.9587E-02

1.8801E-01

-9.9420E-02

2.6962E-02

-3.7834E-03

2.1351E-04

S7

-2.7079E+00

2.1555E-01

1.1721E+00

-1.0729E+00

4.7117E-01

-1.0868E-01

1.0564E-02

S8

-3.2251E+01

2.7500E+01

-1.6516E+01

6.8063E+00

-1.8242E+00

2.8480E-01

-1.9494E-02

S9

-1.6309E+01

1.2381E+01

-6.7184E+00

2.5390E+00

-6.3418E-01

9.4023E-02

-6.2597E-03

S10

-6.8866E-01

3.2789E-01

-1.0706E-01

2.2846E-02

-2.8711E-03

1.6120E-04

0.0000E+00

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 E7, and an image plane S15. 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, and an E4 fifth lens E5; the second lens group G2 includes a sixth lens E6.

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

Table 9 shows a basic structural parameter table of the optical lens group of example five, in which the units of the curvature radius, thickness/distance, focal length, and effective radius are all millimeters (mm), infinity is an optical lens group in the far-beat position in the left column in the thickness column, 80mm is an optical lens group in the close-beat position in the right column in the thickness column, and the distance between the subject and the optical lens group is 80 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

-5.0082E-02

4.6700E-01

-2.4906E+00

8.4822E+00

-1.9678E+01

3.2171E+01

-3.7773E+01

S2

2.1591E-03

2.8928E-02

-1.4562E-01

2.9031E-01

-1.5009E-01

-3.5030E-01

6.8665E-01

S3

4.3718E-02

9.2119E-02

-1.2766E+00

6.4073E+00

-2.0077E+01

4.2205E+01

-6.1514E+01

S4

6.7244E-02

-8.3175E-02

4.7634E-02

-2.5727E-01

1.0529E+00

-2.3319E+00

3.3906E+00

S5

3.0034E-02

-1.3532E-01

4.2166E-01

-1.0792E+00

1.9735E+00

-2.4921E+00

2.1631E+00

S6

-5.3983E-02

3.2624E-01

-1.0508E+00

2.0577E+00

-2.5863E+00

2.0964E+00

-1.0160E+00

S7

-8.6478E-02

8.4600E-01

-7.7655E+00

3.7799E+01

-1.1342E+02

2.2542E+02

-3.0913E+02

S8

-5.4869E-02

5.2154E-01

-4.7973E+00

2.2003E+01

-6.0961E+01

1.1089E+02

-1.3867E+02

S9

1.8548E-01

4.2339E-01

-2.9920E+00

9.0680E+00

-1.5709E+01

1.5014E+01

-4.5243E+00

S10

2.9745E-01

-1.1383E+00

6.0270E+00

-2.1997E+01

5.3688E+01

-9.0162E+01

1.0671E+02

S11

4.2060E-03

-1.8531E-02

5.1746E-01

-2.6581E+00

6.4059E+00

-9.2707E+00

8.8799E+00

S12

-5.8612E-02

2.2538E-01

-6.9757E-02

-1.5578E+00

4.6784E+00

-7.0804E+00

6.7706E+00

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

3.2135E+01

-1.9801E+01

8.7392E+00

-2.6903E+00

5.4819E-01

-6.6402E-02

3.6177E-03

S2

-4.7317E-01

3.9230E-02

1.6416E-01

-1.2595E-01

4.4889E-02

-8.2475E-03

6.3088E-04

S3

6.3324E+01

-4.6332E+01

2.3933E+01

-8.5264E+00

1.9927E+00

-2.7487E-01

1.6958E-02

S4

-3.4739E+00

2.5550E+00

-1.3403E+00

4.8886E-01

-1.1766E-01

1.6790E-02

-1.0754E-03

S5

-1.2633E+00

4.5833E-01

-7.2127E-02

-1.5712E-02

1.0711E-02

-2.2037E-03

1.7033E-04

S6

1.7750E-01

1.1587E-01

-9.9562E-02

3.6552E-02

-7.6268E-03

8.7961E-04

-4.3788E-05

S7

2.9916E+02

-2.0600E+02

1.0038E+02

-3.3831E+01

7.5046E+00

-9.8595E-01

5.8137E-02

S8

1.2217E+02

-7.6545E+01

3.3927E+01

-1.0400E+01

2.0981E+00

-2.5064E-01

1.3436E-02

S9

-6.9489E+00

1.0465E+01

-7.0982E+00

2.8710E+00

-7.1006E-01

9.9571E-02

-6.0895E-03

S10

-9.0256E+01

5.4744E+01

-2.3607E+01

7.0618E+00

-1.3925E+00

1.6275E-01

-8.5381E-03

S11

-5.8882E+00

2.7528E+00

-9.0656E-01

2.0607E-01

-3.0795E-02

2.7241E-03

-1.0811E-04

S12

-4.4008E+00

1.9990E+00

-6.3663E-01

1.3957E-01

-2.0088E-02

1.7104E-03

-6.5341E-05

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.

To sum up, examples one to five respectively satisfy the relationships shown in table 11.

Conditions/examples	1	2	3	4	5
						\|△T\|/EPD	0.14	0.16	0.66	0.33	0.68
\|TLm-TLi\|	0.00	0.27	0.00	0.00	0.00
						TDi/fi	0.86	0.88	0.85	0.78	0.94
ImgHm/fnom-ImgHi/fnoi	0.19	0.03	0.39	0.07	0.04
						BLi/TDi-BLi/TLi	0.03	0.03	0.09	0.05	0.06
BLm/TDm-BLm/TLm	0.01	0.02	0.01	0.003	0.24
						TAN(Semi-FOVi)/TAN(Semi-FOVm)	1.11	1.16	1.13	1.05	0.99
(ImgHi-ImgHm)/△T	0.00	0.48	0.05	0.20	0.05
						\|Fg1\|/\|Fg2\|	0.89	0.83	1.15	0.55	1.05
ETmax/∑ET	0.23	0.30	0.23	0.22	0.41
						ETmin/ETmax	0.41	0.27	0.27	0.55	0.07
R6/R2	-0.25	-0.53	-0.54	-0.58	-0.26
						R10/R12	0.09	0.36	0.39	0.16	0.22
CTmax/∑CT	0.38	0.39	0.24	0.32	0.46
						V2/V4	0.74	0.94	1.16	0.94	1.00

TABLE 11

Table 12 gives effective focal lengths Fg1 and Fg2 of the respective lens groups of the optical lens groups of example one to example five.

Conditions/examples	1	2	3	4	5
						TLi	7.07	7.55	11.00	6.72	12.00
TLm	7.07	7.82	11.00	6.72	12.00
						ImgHi	3.25	3.30	2.14	3.30	1.90
ImgHm	3.25	3.10	2.04	3.10	1.80
						fi	6.96	7.11	9.51	6.88	10.08
fm	6.14	6.50	5.59	6.12	8.89
						Fg1	4.53	5.09	5.37	5.51	12.72
Fg2	-5.09	-6.17	-4.69	-9.97	12.15
						△T	0.44	0.42	1.86	0.99	2.05
Semi-FOVi	24.17	24.17	12.53	22.78	10.42
						Semi-FOVm	22.05	21.22	11.10	21.80	10.51
fnoi	2.21	2.82	3.40	2.28	3.36
						fnom	1.95	2.58	2.00	2.05	2.96
TDi	5.99	6.27	8.09	5.40	9.44
						TDm	6.43	6.68	9.95	6.39	7.38
BLi	1.08	1.28	2.91	1.33	2.56
						BLm	0.64	1.14	1.05	0.34	4.62
EPD	3.15	2.52	2.80	3.01	3.00
						Um	80.00	80.00	30.00	10.00	80.00
V30	3	3	4	3	3
						f1	3.19	3.52	35.98	3.60	7.98
f2	-8.24	-8.43	-12.19	-9.42	-10.09
						f3	-6.83	-8.36	3.73	-13.06	7.50
f4	111.00	25.88	57.39	20.87	498.45
						f5	-8.47	-70.61	-6.01	18.42	-7.45
f6	12.52	-18.44	-21.04	-6.65	12.15

TABLE 12

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

a diaphragm;

a first lens group with positive refractive power, the first lens group at least comprising a first lens and a second lens;

a second lens group including at least one lens;

when a shot object moves to be close to the optical lens group, adjusting the interval of the first lens group and the second lens group on the optical axis of the optical lens group to realize focusing;

the difference quantity DeltaT of the interval between the first lens group and the second lens group and the entrance pupil diameter EPD of the optical lens group at the close shooting position and the far shooting position satisfy the following conditions: 0< | delta T |/EPD < 0.8.

2. A mobile focusing optical lens group according to claim 1, characterized in that said optical lens group has six lenses.

3. A mobile focusing optical lens assembly according to claim 2, wherein the distance TDi between the object-side surface of the first lens and the image-side surface of the fifth lens on the optical axis in the telephoto position and the focal length fi of the optical lens assembly in the telephoto position satisfy: 0.7< TDi/fi <1.

4. A mobile focusing optical lens assembly as claimed in claim 2, wherein the distance TDi from the object side surface of said first lens to the image side surface of said fifth lens on said optical axis when said optical lens assembly is in said telephoto position, the distance TLi from the object side surface of said first lens to the imaging surface of said optical lens assembly on said optical axis when said optical lens assembly is in said telephoto position, and the distance BLi from the image side surface of said sixth lens to said imaging surface when said optical lens assembly is in said telephoto position satisfy: 0< BLi/TDi-BLi/TLi < 0.1.

5. A mobile focusing optical lens assembly as claimed in claim 2, wherein the distance TDm between the object-side surface of said first lens and the image-side surface of said fifth lens on said optical axis when said optical lens assembly is in said close-up position, the distance TLm between the object-side surface of said first lens and the image plane of said optical lens assembly on said optical axis when said optical lens assembly is in said close-up position, and the distance BLm between the image-side surface of said sixth lens and the image plane of said optical lens assembly on said optical axis when said optical lens assembly is in said close-up position satisfy: 0< BLm/TDm-BLm/TLm < 0.3.

6. A moving focus optical lens group as claimed in claim 2, wherein the radius of curvature R2 of the image side surface of said first lens and the radius of curvature R6 of the image side surface of said third lens satisfy: -0.8< R6/R2< 0.

7. The moving focus optical lens group of claim 2, wherein the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0< R10/R12< 0.5.

8. A moving-focus optical lens group according to claim 2, wherein the maximum central thickness CTmax of the lenses in said optical lens group and the sum Σ CT of the central thicknesses of the first to fifth lenses in said optical lens group on the optical axis of said optical lens group, respectively, satisfy: 0.2< CTmax/Σ CT < 0.5.

9. A moving-focus optical lens group according to claim 1, wherein when said optical lens group is in said close-up position, the distance Um between said object and the object-side surface of said first lens satisfies: um is more than or equal to 10mm and less than or equal to 80 mm.

10. An optical lens assembly for moving focus, comprising, in order from an object side to an image side of the optical lens assembly:

a diaphragm;

a second lens group including at least one lens;

the distance TLi of the optical lens group on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the far shooting position, and the distance TLm of the optical lens group on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group in the near shooting position satisfy: l TLm-TLi l <0.3 mm.