CN113946029A

CN113946029A - Moving focusing optical lens group

Info

Publication number: CN113946029A
Application number: CN202111223506.5A
Authority: CN
Inventors: 徐胡伟; 张晓彬; 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2022-01-18

Abstract

The invention provides an optical lens group for moving focusing. The optical lens group includes a first lens group and a second lens group from an object side to an image side in an optical axis direction, the first lens group having positive power, the first lens group including: a first lens, a second lens, and a third lens, the second lens group including: a fourth lens; a fifth lens having a positive refractive power; when the object moves from infinity to macro relative to the optical lens group or when the object moves from macro to infinity relative to the optical lens group, the second lens group moves on the optical axis to realize focusing; the difference quantity Delta T of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at the close shooting position and the optical lens group is located at the far shooting position, and the sum Sigma CT of the thicknesses of the first lens to the fifth lens distributed on the optical axis in the optical lens group satisfy the following conditions: 0.5< | DeltaT |/. Sigma CT < 1.5. The invention solves the problem of low imaging quality of the optical imaging lens in the prior art.

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

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

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

That is, the optical imaging lens of the prior art has a problem of low imaging quality.

Disclosure of Invention

The invention mainly aims to provide an optical lens group for moving focusing, which is used for solving the problem of low imaging quality of an optical imaging lens in the prior art.

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, the optical lens group including, in order from an object side to an image side of the optical lens group in an optical axis direction, a first lens group having positive power, the first lens group comprising: a first lens, a second lens, and a third lens, the second lens group including: a fourth lens; a fifth lens having a positive refractive power; when the object moves from infinity to macro relative to the optical lens group or when the object moves from macro to infinity relative to the optical lens group, the second lens group moves on the optical axis to realize focusing; the difference quantity Delta T of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at the close shooting position and the optical lens group is located at the far shooting position, and the sum Sigma CT of the thicknesses of the first lens to the fifth lens distributed on the optical axis in the optical lens group satisfy the following conditions: 0.5< | DeltaT |/. Sigma CT < 1.5.

Further, the second lens group has negative power.

Further, the optical lens group further includes a stop located between the object side of the optical lens group and the third lens.

Further, 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 located at the close-up position and a focal length fm when the optical lens group is located at the close-up position satisfies: 0.6< TDm/fm < 2.

Further, when the optical lens group is located at 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 20mm and less than 60 mm.

Further, a half ImgH of a diagonal length of the effective pixel area on the imaging surface of the optical lens group and a focal length fm of the optical lens group at the close-up position satisfy: 0.2< ImgH/fm < 0.4.

Further, the aperture value fnoi when the optical lens group is at the telephoto position, the aperture value fnom when the optical lens group is at the close-up position, the half of the maximum angle of view Semi-FOVi when the optical lens group is at the telephoto position, and the half of the maximum angle of view Semi-FOVm when the optical lens group is at the close-up position satisfy: TAN (Semi-FOVi) × fnoi-TAN (Semi-FOVm) × fnom < 0.4.

Further, a distance TL on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group and 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 located at the close-up position satisfy: 0.6< TDm/TL <1.

Further, the focal length fG1 of the first lens group, the focal length f1 of the first lens, the focal length f2 of the second lens, and the focal length f3 of the third lens satisfy: 0.8< fG1/(f1+ f2+ f3) < 1.1.

Further, a focal length fG2 of the second lens group and a focal length f4 of the fourth lens satisfy: 0.7< f4/fG2< 0.9.

Further, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens satisfy: 0.8< ET2/(ET1+ ET3) < 1.2.

Further, a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R4 of the image-side surface of the second lens satisfy: 0.3< (R3-R4)/(R3+ R4) < 0.5.

Further, a sum Σ CT of thicknesses of the first lens to the fifth lens in the optical axis, a center thickness CT4 of the fourth lens in the optical axis, and a center thickness CT5 of the fifth lens in the optical axis, respectively, satisfies: 0.3< (CT4+ CT 5)/. Sigma CT < 0.5.

Further, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 0.9< CT1/(CT2+ CT3) < 1.3.

Further, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the air interval T12 of the first lens and the second lens on the optical axis satisfy: T12/(CT1-CT2) < 0.5.

Further, the central thickness CT2 of the second lens on the optical axis, the difference amount Δ T of the interval between the first lens group and the second lens group on the optical axis when the optical lens group is located at the close-up position and when the optical lens group is located at the far-out position satisfy: CT2/| DeltaT | < 0.3.

Further, the abbe number V2 of the second lens and the abbe number V5 of the fifth lens satisfy: v2+ V5< 60.

Further, when the optical lens group is located at the far shooting position and the close shooting position, the distance from the object side surface of the first lens to the imaging surface of the optical lens group is kept unchanged.

According to another aspect of the present invention, there is provided an optical lens group for moving focus, the optical lens group including, in order from an object side of the optical lens group to an image side of the optical lens group in an optical axis direction, a first lens group having positive power, the first lens group comprising: a first lens, a second lens, and a third lens, the second lens group including: a fourth lens; a fifth lens having a positive refractive power; when the object moves from infinity to macro relative to the optical lens group or when the object moves from macro to infinity relative to the optical lens group, the second lens group moves on the optical axis to realize focusing; the central thickness CT2 of the second lens on the optical axis, the difference quantity DeltaT of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at the close shooting position and the optical lens group is located at the far shooting position satisfy the following conditions: CT2/| DeltaT | < 0.3.

Further, the second lens group has negative power.

By applying the technical scheme of the invention, the optical lens group sequentially comprises a first lens group and a second lens group from the object side of the optical lens group to the image side of the optical lens group along the optical axis direction, the first lens group has positive focal power, the first lens group comprises a first lens, a second lens and a third lens, the second lens group comprises a fourth lens and a fifth lens, and the fifth lens has positive focal power; when the object moves from infinity to macro relative to the optical lens group or when the object moves from macro to infinity relative to the optical lens group, the second lens group moves on the optical axis to realize focusing; the difference quantity Delta T of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at the close shooting position and the optical lens group is located at the far shooting position, and the sum Sigma CT of the thicknesses of the first lens to the fifth lens distributed on the optical axis in the optical lens group satisfy the following conditions: 0.5< | DeltaT |/. Sigma CT < 1.5.

Through the reasonable distribution of the focal power of each lens, the aberration generated by the optical lens group is favorably balanced, and the imaging quality of the optical lens group is greatly improved. The reasonable control optics lens group is close to clap the position and when clapping the position far away first lens group or second lens group at epaxial displacement, guarantees the distance of removal in the working stroke of motor, ensures the safety and stability work, and the gross thickness of reasonable control lens is all comparatively convenient to lens processing and technology side cut, guarantees the production yield of lens.

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 of the zoom lens in fig. 1, respectively;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Wherein the figures include the following reference numerals:

g1, a first lens group; g2, second lens group; STO, stop; e1, first lens; s1, the object side surface of the first lens; s2, an image side surface of the first lens; e2, second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; e5, fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of the fifth lens element; e6, optical filters; s11, the object side surface of the optical filter; s12, the image side surface of the filter plate; and S13, 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 object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. For the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The invention provides an optical lens group for moving focusing, aiming at solving the problem of low imaging quality of an optical imaging lens in the prior art.

Example one

As shown in fig. 1 to 60, the optical lens group includes, in order from an object side of the optical lens group to an image side of the optical lens group in an optical axis direction, a first lens group having positive power, the first lens group including a first lens, a second lens, and a third lens, the second lens group including a fourth lens and a fifth lens, the fifth lens having positive power; when a shot object gradually approaches the optical lens group, when the shot object moves from infinite distance to micro distance relative to the optical lens group or when the shot object moves from micro distance to infinite distance relative to the optical lens group, the second lens group moves on the optical axis to realize focusing; the difference quantity Delta T of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at the close shooting position and the optical lens group is located at the far shooting position, and the sum Sigma CT of the thicknesses of the first lens to the fifth lens distributed on the optical axis in the optical lens group satisfy the following conditions: 0.5< | DeltaT |/. Sigma CT < 1.5.

Preferably, a difference amount Δ T of an interval between the first lens group and the second lens group on the optical axis when the optical lens group is located at the close-up position and when the optical lens group is located at the far-up position, and a sum Σ CT of thicknesses of the first lens to the fifth lens in the optical lens group distributed on the optical axis satisfy: 0.55< | DeltaT |/. Sigma CT < 1.4.

It should be noted that when the object moves from infinity to macro with respect to the optical lens group or when the object moves from macro to infinity with respect to the optical lens group, the second lens group moves on the optical axis to achieve focus focusing; when the object is close to or far away from the optical lens group, the motor drives the first lens group or the second lens group to move so as to change the distance between the first lens group and the second lens group, and therefore automatic focusing is achieved.

The long shot is a shooting scene in which the subject is at infinity, and the short shot is a shooting scene in which the subject is at a macro. The far shooting position refers to the position of the optical lens group during far shooting, and the close shooting position refers to the position of the optical lens group during close shooting.

In the present embodiment, the second lens group has negative power. The second lens group has negative focal power, is matched with the corresponding image height of the corresponding chip, and has a positive effect on improving the imaging quality of light.

In this embodiment, the optical lens group further includes a stop, and the stop is located between the object side of the optical lens group and the third lens. The diaphragm is located between the object side of the optical lens group and the third lens, so that the change of the diaphragm can be realized, the simultaneous long focal end meeting the photographing requirement can obtain better resolving power, and the design difficulty is reduced. Meanwhile, the caliber of the lens can be reduced, and the miniaturization of the optical lens group is facilitated.

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 and a focal length fm when the optical lens group is in the close-up position satisfies: 0.6< TDm/fm < 2. The TDm/fm is limited within a reasonable range, so that the total length of the whole optical lens group is shorter, and the requirement of thinning the mobile phone is met. Meanwhile, the residual aberration of the first lens group can be effectively corrected, and a better imaging picture is ensured to be obtained. Preferably, 0.7< TDm/fm < 1.9.

In this embodiment, when the optical lens group is located at 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 20mm and less than 60 mm. The optical lens group has the function of macro-shooting, can realize clear imaging under the ultrashort distance of 20mm to 60mm, is suitable for multiple scenes in life, and increases the variability of the use scenes of the optical lens group.

In this embodiment, a distance between half ImgH of a diagonal length of the effective pixel region on the imaging surface of the optical lens group and the focal length fm of the optical lens group at the close-up position satisfies: 0.2< ImgH/fm < 0.4. By controlling the ImgH/fm within a reasonable range, light emitted by the first lens group can be effectively converged, the aperture of the lens is further reduced, meanwhile, the light trends of different moving distances are guaranteed to be smooth as much as possible, high-sensitivity tolerance caused by overlarge deflection is avoided, and the imaging quality of the optical lens group is greatly improved. Preferably, 0.22< ImgH/fm < 0.39.

In the present embodiment, the aperture value fnoi when the optical lens group is at the telephoto position, the aperture value fnom when the optical lens group is at the close-up position, the half of the maximum angle of view Semi-FOVi when the optical lens group is at the telephoto position, and the half of the maximum angle of view Semi-FOVm when the optical lens group is at the close-up position satisfy: TAN (Semi-FOVi) × fnoi-TAN (Semi-FOVm) × fnom < 0.4. By controlling TAN (Semi-FOVi) × fnoi-TAN (Semi-FOvm) × fnom in a reasonable range, the F number is ensured to be in an effective range, the range of the maximum half field angle is ensured, meanwhile, the optical lens group is ensured to present more detailed information of a shot object, and the imaging quality of the optical lens group is greatly improved. Preferably, 0.1< TAN (Semi-FOVi) × fnoi-TAN (Semi-FOVm) × fnom < 0.38.

In this embodiment, a distance TL on the optical axis from the object-side surface of the first lens to the imaging surface of the optical lens group and 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 satisfy: 0.6< TDm/TL <1. By limiting TDm/TL in a reasonable range, enough air space is left between the image side surface of the fifth lens and the imaging surface, the distortion of the optical lens group can be better balanced, in addition, the molding debugging process space is larger, the risk of stray light caused by appearance problems of the lenses is avoided, and the CRA (chip ray angle) can be better matched with a chip. Preferably, 0.62< TDm/TL < 0.9.

In the present embodiment, the focal length fG1 of the first lens group, the focal length f1 of the first lens, the focal length f2 of the second lens, and the focal length f3 of the third lens satisfy: 0.8< fG1/(f1+ f2+ f3) < 1.1. By limiting fG1/(f1+ f2+ f3) within a reasonable range, the effective focal length of the first lens group can be reasonably distributed, so that the problems of distortion and astigmatism of the optical lens group can be well balanced, and a larger image plane can be acquired and higher imaging quality is achieved. Preferably, 0.85< fG1/(f1+ f2+ f3) < 1.05.

In the present embodiment, a focal length fG2 of the second lens group and a focal length f4 of the fourth lens satisfy: 0.7< f4/fG2< 0.9. By limiting f4/fG2 within a reasonable range, light rays emitted by the first lens group can be converged to the maximum extent, spherical aberration, coma aberration and astigmatism of the optical lens group are effectively balanced, and the resolving power of the optical lens group is improved. Preferably, 0.75< f4/fG2< 0.9.

In the present embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, and the edge thickness ET3 of the third lens satisfy: 0.8< ET2/(ET1+ ET3) < 1.2. The ratio of the edge thicknesses of the three lenses of the first lens group is reasonably controlled, so that the chromatic aberration of the 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, 0.8< ET2/(ET1+ ET3) < 1.2.

In the present embodiment, a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R4 of the image-side surface of the second lens satisfy: 0.3< (R3-R4)/(R3+ R4) < 0.5. By limiting (R3-R4)/(R3+ R4) within a reasonable range, the problem of processing difficulty caused by an excessively large inclination angle is avoided, and the front two lenses can effectively balance the spherical aberration of the system and reduce the sensitivity of the front two lenses. To ensure better convergence of the external light and a larger aperture. Preferably, 0.31< (R3-R4)/(R3+ R4) < 0.48.

In the present embodiment, the sum Σ CT of the thicknesses of the first to fifth lenses on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis, respectively, satisfies: 0.3< (CT4+ CT 5)/. Sigma CT < 0.5. By limiting (CT4+ CT 5)/[ sigma ] CT within a reasonable range, the processing and assembling characteristics of the second lens group can be ensured, and the problems of interference of front and rear lenses in the assembling process caused by too small gaps are avoided; meanwhile, the optical lens group is beneficial to slowing down the deflection of light, can adjust the field curvature of the optical lens group, reduces the sensitivity and further obtains better imaging quality. Preferably, 0.32< (CT4+ CT 5)/. Sigma CT < 0.48.

In the present embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 0.9< CT1/(CT2+ CT3) < 1.3. By limiting the CT1/(CT2+ CT3) within a reasonable range, the thickness complementation of the first lens, the second lens and the third lens can be realized, a thick-thin-thick configuration is basically formed, the positive and negative spherical aberration, the positive and negative astigmatism, the positive and negative distortion, the chromatic aberration and the like are well offset, the complementary buffering effect is good for extreme environments such as high and low temperature, and the excellent temperature drift performance is shown. Preferably, 0.93< CT1/(CT2+ CT3) < 1.26.

In the present embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the air interval T12 of the first lens and the second lens on the optical axis satisfy: T12/(CT1-CT2) < 0.5. By limiting T12/(CT1-CT2) within a reasonable range, the lenses can be ensured not to generate mutual interference, the structural design and the production line assembly process of the lens barrel and the spacer are facilitated, and the distortion of the optical lens group can be better balanced. In addition, the forming and debugging process has larger space, and the stray light risk caused by appearance problems of the lens is avoided. Preferably, 0.2< T12/(CT1-CT2) < 0.48.

In the present embodiment, the central thickness CT2 of the second lens on the optical axis, the difference amount Δ T of the interval between the first lens group and the second lens group on the optical axis when the optical lens group is located at the close-up position and when the optical lens group is located at the far-out position satisfy: CT2/| DeltaT | < 0.3. By limiting the CT2/| DeltaT | within a reasonable range, on one hand, the requirement of the assembly distance is ensured, and the problem of interference caused by over-small distance between the first lens group and the second lens group in the running process of the motor is avoided; in addition, on the one hand, the central thickness of the second lens is reasonably controlled, and the problems that a production line is difficult to process and assemble due to overlarge or undersize central thickness are avoided. Preferably, 0.05< CT2/| Δ T | < 0.25.

In the present embodiment, the abbe number V2 of the second lens and the abbe number V5 of the fifth lens satisfy: v2+ V5< 60. The Abbe number is an inverse proportional index to express the dispersion ability of a transparent substance, and the dispersion phenomenon is more serious when the numerical value is smaller. The larger the Abbe number of the material is, the closer the refractive indexes of different wavelengths are, and the more favorable the convergence of light rays with different wavelengths is. By limiting V2+ V5 within a reasonable range, the influence of position chromatic aberration and magnification chromatic aberration can be effectively weakened. Preferably 45< V2+ V5< 60.

In this embodiment, when the optical lens group is located at the telephoto position and the close-up position, the distance from the object-side surface of the first lens to the imaging surface of the optical lens group remains unchanged. The total length of the optical lens group is equal 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, the second lens group is ensured not to interfere with the module end when the remote shooting position and the close shooting position are ensured, and the assembly of the optical lens group is facilitated.

Example two

As shown in fig. 1 to 60, the optical lens group includes, in order from an object side of the optical lens group to an image side of the optical lens group in an optical axis direction, a first lens group having positive power, the first lens group including a first lens, a second lens, and a third lens, the second lens group including a fourth lens and a fifth lens, the fifth lens having positive power; when the object moves from infinity to macro relative to the optical lens group or when the object moves from macro to infinity relative to the optical lens group, the second lens group moves on the optical axis to realize focusing; the central thickness CT2 of the second lens on the optical axis, the difference quantity DeltaT of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at the close shooting position and the optical lens group is located at the far shooting position satisfy the following conditions: CT2/| DeltaT | < 0.3.

Through the reasonable distribution of the focal power of each lens, the aberration generated by the optical lens group is favorably balanced, and the imaging quality of the optical lens group is greatly improved. By limiting the CT2/| DeltaT | within a reasonable range, on one hand, the requirement of the assembly distance is ensured, and the problem of interference caused by over-small distance between the first lens group and the second lens group in the running process of the motor is avoided; in addition, on the one hand, the central thickness of the second lens is reasonably controlled, and the problems that a production line is difficult to process and assemble due to overlarge or undersize central thickness are avoided.

Preferably, the central thickness CT2 of the second lens on the optical axis, the difference amount Δ T of the interval between the first lens group and the second lens group on the optical axis when the optical lens group is located at the close-up position and when the optical lens group is located at the far-up position satisfy: 0.05< CT2/| Δ T | < 0.25.

The long shot is a shooting scene in which a subject is at infinity, and the short shot is a shooting scene in which a subject is at macro. The macro is a macro photographing in which the distance between the object and the optical lens group is within a certain range, and does not mean that the distance between the object and the optical lens group is a specific value.

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

The optical lens group in the present application may employ a plurality of lenses, for example, the above five lenses. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the optical lens group can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the optical lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The optical lens group has large aperture and large angle of view. The advantages of ultra-thin and good imaging quality can meet the miniaturization requirement of intelligent electronic products.

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

However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical lens group may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the optical lens group is not limited to include five lenses. The optical lens group may also include other numbers of lenses, as desired.

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

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

Example one

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

As shown in fig. 1 and fig. 2, the optical lens assembly, in order from an object side to an image side, comprises: a first lens group G1, a second lens group G2, a filter E6, and an image plane S13. Wherein the first lens group G1 includes a first lens E1, a second lens E2, a stop STO, and a third lens E3; the second lens group G2 includes a fourth lens E4 and a fifth lens E5.

The first lens 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 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 negative 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 element E5 has positive 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 filter E6 has an object side surface S11 of the filter and an image side surface S12 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 1 shows a basic structural parameter table of the optical lens group of example one, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm), the left column infinity in the thickness column is that the optical lens group is in the telephoto position, and the right column 55mm in the thickness column is that the optical lens group is in the close-up position, and the distance between the subject and the optical lens group is 55 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 fifth lens element E5 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-S10 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.4590E-03

7.3767E-03

-5.5785E-04

-3.0641E-02

6.2031E-02

-6.4435E-02

4.0996E-02

S2

-3.9338E-02

2.7834E-01

-7.1747E-01

1.0906E+00

-1.0781E+00

7.0847E-01

-2.9981E-01

S3

-1.6593E-01

4.9730E-01

-1.2532E+00

1.8629E+00

-1.5830E+00

5.3915E-01

3.7114E-01

S4

-9.2873E-02

3.7364E-01

-1.2307E+00

2.4598E+00

-3.2705E+00

3.1440E+00

-2.3846E+00

S5

-1.3010E-02

4.5515E-02

-1.9558E-01

5.2597E-01

-1.1802E+00

2.2024E+00

-3.1493E+00

S6

-4.0872E-03

2.1602E-02

-1.0830E-01

3.5149E-01

-8.7810E-01

1.6791E+00

-2.3734E+00

S7

8.8095E-02

-8.8356E-02

3.6096E-01

-1.5194E+00

4.6652E+00

-1.0444E+01

1.7200E+01

S8

8.6574E-02

-5.4023E-02

1.0800E-01

-9.6933E-02

-6.1869E-01

2.9831E+00

-6.8574E+00

S9

-1.6975E-02

-1.5825E-02

6.3669E-02

-1.7264E-01

3.1153E-01

-3.8673E-01

3.3861E-01

S10

-2.7252E-02

-1.1164E-02

5.9990E-02

-1.6435E-01

2.8595E-01

-3.2979E-01

2.5482E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.6368E-02

3.7625E-03

-2.6636E-04

-1.0502E-04

3.3845E-05

-4.1356E-06

1.9484E-07

S2

6.8598E-02

1.4582E-03

-6.7218E-03

2.3233E-03

-4.1016E-04

3.8781E-05

-1.5612E-06

S3

-6.1068E-01

4.0427E-01

-1.6299E-01

4.2591E-02

-7.0754E-03

6.8154E-04

-2.9040E-05

S4

1.5528E+00

-8.8839E-01

4.1851E-01

-1.4689E-01

3.4755E-02

-4.8719E-03

3.0387E-04

S5

3.2855E+00

-2.4508E+00

1.2879E+00

-4.6488E-01

1.0965E-01

-1.5213E-02

9.4140E-04

S6

2.4326E+00

-1.7894E+00

9.3210E-01

-3.3502E-01

7.8942E-02

-1.0967E-02

6.8058E-04

S7

-2.0856E+01

1.8496E+01

-1.1814E+01

5.2782E+00

-1.5629E+00

2.7521E-01

-2.1798E-02

S8

1.0039E+01

-1.0048E+01

6.9867E+00

-3.3287E+00

1.0377E+00

-1.9077E-01

1.5683E-02

S9

-2.1137E-01

9.3950E-02

-2.9361E-02

6.2932E-03

-8.8941E-04

7.7495E-05

-3.4195E-06

S10

-1.2911E-01

3.9527E-02

-5.2264E-03

-6.7143E-04

3.3139E-04

-3.3892E-05

0.0000E+00

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 E6, and an image plane S13. Wherein the first lens group G1 includes a first lens E1, a second lens E2, a stop STO, and a third lens E3; the second lens group G2 includes a fourth lens E4 and a fifth lens E5.

The first lens 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 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 negative power, the object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is concave; the fifth lens element E5 has positive 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 filter E6 has an object side surface S11 of the filter and an image side surface S12 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 3 shows a basic structural parameter table of the optical lens group of example two, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm), infinity is a position where the optical lens group is in the telephoto position in the left column of the thickness column, 20mm is a position where the optical lens group is in the close-up position in the right column of the thickness column, and the distance between the subject and the optical lens group is 20 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

-4.4051E-03

1.3978E-02

-1.4099E-02

-1.4166E-02

5.0218E-02

-6.1118E-02

4.3478E-02

S2

-3.9667E-02

2.7574E-01

-7.0761E-01

1.0721E+00

-1.0569E+00

6.9323E-01

-2.9344E-01

S3

-1.7397E-01

5.4973E-01

-1.4466E+00

2.2874E+00

-2.2119E+00

1.2195E+00

-1.9101E-01

S4

-1.0643E-01

4.8591E-01

-1.6411E+00

3.2910E+00

-4.2675E+00

3.8038E+00

-2.4819E+00

S5

-2.0105E-02

1.0431E-01

-4.2270E-01

1.1461E+00

-2.5383E+00

4.5660E+00

-6.2670E+00

S6

-5.2910E-03

1.8647E-02

-1.2843E-02

-1.6720E-01

6.7095E-01

-1.3511E+00

1.7765E+00

S7

9.1892E-02

-8.6258E-02

3.2245E-01

-1.3953E+00

4.3615E+00

-9.8236E+00

1.6215E+01

S8

9.8479E-02

-9.3931E-02

4.0600E-01

-1.7385E+00

5.1943E+00

-1.0960E+01

1.6670E+01

S9

-1.9200E-02

-1.7101E-02

5.9431E-02

-1.4438E-01

2.3083E-01

-2.4468E-01

1.7054E-01

S10

-2.5076E-02

-2.1699E-02

8.9017E-02

-2.2079E-01

3.5850E-01

-3.9461E-01

3.0118E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.9869E-02

5.8730E-03

-1.0518E-03

8.5553E-05

4.3960E-06

-1.4984E-06

9.0596E-08

S2

6.7778E-02

7.8284E-04

-6.2594E-03

2.1804E-03

-3.8499E-04

3.6342E-05

-1.4598E-06

S3

-2.4920E-01

2.2422E-01

-9.5221E-02

2.4121E-02

-3.6636E-03

3.0183E-04

-9.9030E-06

S4

1.3174E+00

-6.4892E-01

2.9968E-01

-1.1185E-01

2.8651E-02

-4.3127E-03

2.8511E-04

S5

6.3029E+00

-4.5560E+00

2.3293E+00

-8.2027E-01

1.8911E-01

-2.5679E-02

1.5567E-03

S6

-1.6614E+00

1.1417E+00

-5.7759E-01

2.0985E-01

-5.1725E-02

7.7150E-03

-5.2328E-04

S7

-1.9697E+01

1.7502E+01

-1.1194E+01

5.0003E+00

-1.4770E+00

2.5876E-01

-2.0331E-02

S8

-1.8443E+01

1.4826E+01

-8.5564E+00

3.4504E+00

-9.2218E-01

1.4669E-01

-1.0509E-02

S9

-7.2921E-02

1.3429E-02

3.6725E-03

-3.1037E-03

8.8790E-04

-1.2563E-04

7.3281E-06

S10

-1.6091E-01

5.9915E-02

-1.5217E-02

2.5111E-03

-2.4249E-04

1.0395E-05

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 E6, and an image plane S13. Wherein the first lens group G1 includes a first lens E1, a second lens E2, a stop STO, and a third lens E3; the second lens group G2 includes a fourth lens E4 and a fifth lens E5.

Table 5 shows a basic structural parameter table of the optical lens groups of example three, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm), infinity is an optical lens group in the far-shooting position in the left column of the thickness columns, 47.4450mm is an optical lens group in the close-shooting position in the right column of the thickness columns, and the distance between the subject and the optical lens groups is 47.4450 mm.

TABLE 5

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

TABLE 6

Fig. 23 shows an on-axis chromatic aberration curve at the telephoto position of the optical lens group of example three, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 24 shows a chromatic aberration of magnification curve at the telephoto position of the optical lens group of example three, which represents a deviation of different image heights on the image plane after light passes through the lens. Fig. 25 shows astigmatism curves of the optical lens group of example three at the telephoto position, which represent meridional field curvature and sagittal field curvature. Fig. 26 shows distortion curves of the optical lens group of example three at the telephoto position, which represent values of distortion magnitudes corresponding to different angles of view.

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

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

Example four

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

As shown in fig. 31 and 32, the optical lens assembly, in order from an object side to an image side, comprises: a first lens group G1, a second lens group G2, a filter E6, and an image plane S13. Wherein the first lens group G1 includes a first lens E1, a second lens E2, a stop STO, and a third lens E3; the second lens group G2 includes a fourth lens E4 and a fifth lens E5.

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

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 E6, and an image plane S13. Wherein the first lens group G1 includes a first lens E1, a second lens E2, a stop STO, and a third lens E3; the second lens group G2 includes a fourth lens E4 and a fifth lens E5.

Table 9 shows a basic structural parameter table of the optical lens groups of example five, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm), the left column infinity in the thickness column is that the optical lens group is in the telephoto position, and the right column 34mm in the thickness column is that the optical lens group is in the close-up position, and the distance between the subject and the optical lens group is 34 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.

Watch 10

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

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

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

Example six

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

As shown in fig. 51 and 52, the optical lens assembly, in order from an object side to an image side, comprises: a first lens group G1, a second lens group G2, a filter E6, and an image plane S13. Wherein the first lens group G1 includes a first lens E1, a second lens E2, a stop STO, and a third lens E3; the second lens group G2 includes a fourth lens E4 and a fifth lens E5.

Table 11 shows a basic structural parameter table of the optical lens groups of example six, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm), the left column infinity in the thickness column is that the optical lens group is in the telephoto position, and the right column 29mm in the thickness column is that the optical lens group is in the close-up position, and the distance between the subject and the optical lens group is 29 mm.

TABLE 11

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.3228E-03

5.8745E-03

-2.3082E-02

4.5514E-02

-5.9387E-02

5.5077E-02

-3.8285E-02

S2

5.4021E-03

8.2624E-02

-3.6555E-01

9.0235E-01

-1.4546E+00

1.6055E+00

-1.2505E+00

S3

-1.1821E-01

2.3457E-01

-8.9551E-01

2.5101E+00

-4.7379E+00

6.1132E+00

-5.5257E+00

S4

-8.0704E-02

1.5288E-01

-6.5289E-01

2.1702E+00

-4.8471E+00

7.3163E+00

-7.6780E+00

S5

1.4883E-03

1.1362E-02

-6.9948E-02

3.7937E-01

-1.0495E+00

1.7409E+00

-1.8942E+00

S6

-6.8240E-03

-1.8413E-02

2.1138E-01

-7.3375E-01

1.7622E+00

-3.1180E+00

4.1207E+00

S7

1.1287E-01

-1.4943E-01

4.6219E-01

-1.6005E+00

4.2342E+00

-8.0577E+00

1.0961E+01

S8

1.1504E-01

-1.3243E-01

4.3931E-01

-1.8112E+00

5.7044E+00

-1.2813E+01

2.0560E+01

S9

-1.0780E-02

-4.1007E-02

2.8445E-01

-1.2783E+00

3.8082E+00

-7.8358E+00

1.1445E+01

S10

-1.7629E-02

-1.3954E-02

6.6777E-02

-2.0602E-01

4.1182E-01

-5.5686E-01

5.2282E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

2.0475E-02

-8.3829E-03

2.5515E-03

-5.5119E-04

7.8956E-05

-6.6645E-06

2.4895E-07

S2

7.0125E-01

-2.8552E-01

8.3975E-02

-1.7441E-02

2.4332E-03

-2.0499E-04

7.8925E-06

S3

3.5656E+00

-1.6559E+00

5.5057E-01

-1.2810E-01

1.9839E-02

-1.8391E-03

7.7281E-05

S4

5.7339E+00

-3.0797E+00

1.1847E+00

-3.1916E-01

5.7259E-02

-6.1502E-03

2.9935E-04

S5

1.4170E+00

-7.4072E-01

2.6802E-01

-6.4584E-02

9.5126E-03

-7.0222E-04

1.2746E-05

S6

-4.0642E+00

2.9701E+00

-1.5826E+00

5.9632E-01

-1.5022E-01

2.2649E-02

-1.5424E-03

S7

-1.0589E+01

7.1245E+00

-3.1900E+00

8.5273E-01

-9.1654E-02

-1.0991E-02

2.9502E-03

S8

-2.3707E+01

1.9629E+01

-1.1544E+01

4.6961E+00

-1.2540E+00

1.9730E-01

-1.3824E-02

S9

-1.2035E+01

9.1356E+00

-4.9561E+00

1.8724E+00

-4.6751E-01

6.9292E-02

-4.6127E-03

S10

-3.4498E-01

1.5956E-01

-5.0688E-02

1.0542E-02

-1.2938E-03

7.1126E-05

0.0000E+00

TABLE 12

Fig. 53 shows an on-axis chromatic aberration curve at the telephoto position of the optical lens group of example six, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 54 shows a chromatic aberration of magnification curve at the telephoto position for the optical lens group of example six, which represents a deviation of different image heights on the image plane after light passes through the lens. Fig. 55 shows astigmatism curves of the optical lens group of example six at the telephoto position, which represent meridional field curvature and sagittal field curvature. Fig. 56 shows distortion curves at the telephoto position for the optical lens group of example six, which represent values of distortion magnitudes for different angles of view.

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

As can be seen from fig. 53 to 60, the optical lens group given in example six can achieve good imaging quality.

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

Conditions/examples	1	2	3	4	5	6
							\|△T\|/∑CT	0.69	1.38	0.82	0.75	0.61	0.74
ImgH/fm	0.24	0.38	0.25	0.33	0.28	0.32
							TAN(Semi-FOVi)fnoi-TAN(Semi-FOVm)fnom	0.16	0.35	0.18	0.28	0.21	0.26
TDm/TL	0.64	0.88	0.68	0.75	0.73	0.74
							fG1/(f1+f2+f3)	0.99	1.02	0.96	0.91	0.90	0.88
f4/fG2	0.89	0.80	0.79	0.82	0.80	0.83
							ET2/(ET1+ET3)	0.86	0.91	0.93	0.92	1.13	0.89
(R3-R4)/(R3+R4)	0.32	0.35	0.34	0.44	0.41	0.43
							(CT4+CT5)/∑CT	0.35	0.38	0.35	0.46	0.39	0.46
CT1/(CT2+CT3)	0.96	0.99	1.10	1.13	1.22	1.13
							T12/(CT1-CT2)	0.39	0.47	0.35	0.29	0.29	0.29
CT2/\|△T\|	0.20	0.10	0.17	0.11	0.17	0.12
							V2+V5	45.10	45.10	45.10	45.10	45.10	45.10
TDm/fm	0.80	1.75	0.89	1.22	0.99	1.15

Watch 13

Table 14 gives effective focal lengths f of the optical imaging lenses of example one to example six, and effective focal lengths f1 to f5 of the respective lenses.

TABLE 14

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

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

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

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

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

Claims

1. An optical lens group for moving focusing, comprising, in order from an object side to an image side of the optical lens group in an optical axis direction, a first lens group having positive power and a second lens group, the first lens group comprising: a first lens, a second lens, and a third lens, the second lens group including:

a fourth lens;

a fifth lens having a positive optical power;

wherein the second lens group moves on the optical axis to achieve focus focusing when a subject moves from infinity to macro with respect to the optical lens group or when a subject moves from macro to infinity with respect to the optical lens group; the difference quantity DeltaT between the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at a close shooting position and the optical lens group is located at a far shooting position, and the sum Sigma CT of the thicknesses of the first lens to the fifth lens in the optical lens group on the optical axis satisfy: 0.5< | DeltaT |/. Sigma CT < 1.5.

2. The mobile focusing optical lens group of claim 1, wherein the second lens group has a negative optical power.

3. A mobile focusing optical lens group according to claim 1 further comprising an aperture stop positioned between said object side of said optical lens group and said third lens.

4. A moving-focus optical lens assembly according to claim 1, wherein a distance TDm between an object-side surface of said first lens and an image-side surface of said fifth lens on said optical axis when said optical lens assembly is in said close-up position and a focal length fm of said optical lens assembly in said close-up position satisfies: 0.6< TDm/fm < 2.

5. 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 20mm and less than 60 mm.

6. A mobile focusing optical lens assembly according to claim 1, wherein the length ImgH of half diagonal of effective pixel area on the imaging surface of said optical lens assembly is equal to the focal length fm of said optical lens assembly at said close-up position: 0.2< ImgH/fm < 0.4.

7. A moving-focus optical lens group according to claim 1, wherein the aperture value fnoi when said optical lens group is in said telephoto position, the aperture value fnom when said optical lens group is in said close-up position, half of the maximum field angle Semi-FOVi when said optical lens group is in said telephoto position and half of the maximum field angle Semi-FOVm when said optical lens group is in said close-up position satisfy: TAN (Semi-FOVi) × fnoi-TAN (Semi-FOVm) × fnom < 0.4.

8. The mobile focusing optical lens assembly of claim 1, wherein a distance TL on the optical axis from the object-side surface of the first lens to the image plane of the optical lens assembly and 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 assembly is in the close-up position satisfy: 0.6< TDm/TL <1.

9. A moving focus optical lens group as claimed in claim 1, wherein the focal length fG1 of said first lens group, f1 of said first lens, f2 of said second lens and f3 of said third lens are such that: 0.8< fG1/(f1+ f2+ f3) < 1.1.

10. An optical lens group for moving focusing, comprising, in order from an object side to an image side of the optical lens group in an optical axis direction, a first lens group having positive power and a second lens group, the first lens group comprising: a first lens, a second lens, and a third lens, the second lens group including:

a fourth lens;

a fifth lens having a positive optical power;

wherein the second lens group moves on the optical axis to achieve focus focusing when a subject moves from infinity to macro with respect to the optical lens group or when a subject moves from macro to infinity with respect to the optical lens group;

the central thickness CT2 of the second lens on the optical axis, the difference quantity DeltaT of the intervals of the first lens group and the second lens group on the optical axis when the optical lens group is located at a close shooting position and the optical lens group is located at a far shooting position satisfy: CT2/| DeltaT | < 0.3.