CN117452608A

CN117452608A - Movable focusing optical lens group

Info

Publication number: CN117452608A
Application number: CN202311622733.4A
Authority: CN
Inventors: 程一夫; 张晓彬; 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-01-13
Filing date: 2022-01-13
Publication date: 2024-01-26
Also published as: CN114326037A

Abstract

The invention provides a movable focusing optical lens group. The moving focusing optical lens group sequentially comprises from an object side to an imaging side along an optical axis: a first lens group; a second lens group including at least a seventh lens; when the distance between the shot object and the movable focusing optical lens group is from far to near, adjusting the interval distance between the first lens group and the second lens group on the optical axis to execute focusing; the distance TTLi from the object side surface of the first lens to the imaging surface on the optical axis during far shooting, half of the diagonal line length ImgHi of the effective pixel area of the movable focusing optical lens group on the imaging surface during far shooting, and half of the maximum field angle Semi-FOVi of the movable focusing optical lens group during far shooting satisfy the following conditions: 1< ttli/ImgHi tan (Semi-FOVi) <2. The invention solves the problems that the movable focusing optical lens group in the prior art has miniaturization, large image surface, large depth of field and large aperture which are difficult to be simultaneously compatible.

Description

Movable focusing optical lens group

The present application is a divisional application of patent application with the name of "mobile focusing optical lens group" which is filed to the national intellectual property agency of China, application number 202210039321.7, at day 1 and 13 of 2022.

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to a movable focusing optical lens group.

Background

At present, the market demand of smart phones is increasing year by year, and meanwhile, an optical lens group on the smart phone gradually develops towards diversification along with continuous updating of the demand of users. Generally, a single mobile phone generally carries 2-8 cameras, so the light and thin degree and weight of the cameras become important concerns of mobile phone manufacturers and consumers. The optical lens group with a large image surface can realize higher resolution in actual shooting, and is favored by more and more consumers and mobile phone manufacturers, but the larger image surface leads to the overall longer optical lens group, so that the optical lens group body is heavier and has larger volume; in the prior art, an optical lens assembly for moving focusing is provided, which has poor imaging definition during near shooting and far shooting, and is difficult to meet the user requirement, so that an optical lens assembly for moving focusing, which is suitable for light and thin portable electronic products, has large depth of field, large aperture, good imaging quality and low power consumption, is needed.

Generally, limited by space, it is difficult for a miniaturized camera to meet both far and near photographing requirements, and focusing more rapidly with the development of cameras is a challenge for optical engineers.

That is, the conventional movable focusing optical lens group has problems in that it is difficult to achieve both miniaturization, large image plane, large depth of field and large aperture.

Disclosure of Invention

The invention mainly aims to provide a movable focusing optical lens group so as to solve the problems that the movable focusing optical lens group in the prior art is small in size, large in image plane, large in depth of field and large in aperture and difficult to simultaneously consider.

In order to achieve the above object, according to one aspect of the present invention, there is provided a moving focus optical lens group comprising, in order from an object side to an imaging side along an optical axis: a first lens group; the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the imaging side surface is a convex surface; when the distance between the shot object and the focusing optical lens group is from far to near, the interval distance between the first lens group and the second lens group on the optical axis is adjusted to execute focusing; the entrance pupil diameter EPD of the moving focus optical lens group and the focal length Fg1 of the first lens group satisfy: 0.2< EPD/Fg1<1.

Further, the movable focusing optical lens group further comprises a diaphragm, and the diaphragm is positioned at the object side of the second lens.

Further, when the moving focusing optical lens group is in close shooting, the distance Um between the shot object and the object side surface of the first lens satisfies the following conditions: um is more than or equal to 90mm and less than or equal to 200mm.

Further, a distance TTLi between an object side surface of the first lens element at the time of the far photographing and an imaging surface on an optical axis, a half of a diagonal line length ImgHi of an effective pixel region of the moving focusing optical lens element at the time of the far photographing, and a half of a maximum field angle Semi-FOVi of the moving focusing optical lens element at the time of the far photographing satisfy: 1< ttli/ImgHi tan (Semi-FOVi) <2.

Further, a distance TTLi from an object side surface of the first lens to an imaging surface on an optical axis when the moving focus optical lens group is in a far shot, a half of a diagonal line length ImgHi of an effective pixel region on the imaging surface when the moving focus optical lens group is in a far shot, a distance TTLm from an object side surface of the first lens to an imaging surface on an optical axis when the moving focus optical lens group is in a near shot, and a half of a diagonal line length ImgHm of an effective pixel region on the imaging surface when the moving focus optical lens group is in a near shot satisfy: TTLi/ImgHi-TTLm/ImgHm <0.15.

Further, the focal length Fg1 of the first lens group, the focal length fi of the moving focusing optical lens group when photographing far, and the focal length fm of the moving focusing optical lens group when photographing near satisfy: fg1/fi-Fg1/fm <0.1.

Further, the aperture value fnoi of the moving focus optical lens group at the far shooting and the aperture value fnom of the moving focus optical lens group at the near shooting satisfy: 0.9< fnoi/fnom <1.2.

Further, a distance TDm on the optical axis from the object side surface of the first lens to the imaging side surface of the seventh lens when the focusing optical lens group is in near shooting, a distance TTLm on the optical axis from the object side surface of the first lens to the imaging side surface when the focusing optical lens group is in near shooting, a distance TDi on the optical axis from the object side surface of the first lens to the imaging side surface of the seventh lens when the focusing optical lens group is in far shooting, and a distance TTLi on the optical axis from the object side surface of the first lens to the imaging side surface when the focusing optical lens group is in far shooting satisfy: 0.8< (TDi/TTLi)/(TDm/TTLm) <1.

Further, the sum Σet of the edge thicknesses of the lenses in the movable focusing optical lens group and the sum Σct of the thicknesses of the first lens to the fifth lens in the movable focusing optical lens group on the optical axis satisfy the following conditions: 0.5< ΣET/ΣCT <1.

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

Further, a sum Σatm of a distance BFLm between an imaging side surface and an imaging surface of the seventh lens at the time of near shooting of the moving focus optical lens group and a distance Σatm between air gaps between the lenses in the first lens to the seventh lens at the time of near shooting of the moving focus optical lens group satisfies: BFLm/ΣATm <0.5.

Further, the sum Σatm of the distances on the optical axis of the air gaps between the first lens and the seventh lens in the near photographing of the moving focusing optical lens group and the distance Σt67m of the air gaps between the sixth lens and the seventh lens in the near photographing of the moving focusing optical lens group satisfy: 0.3< T67m/ΣATm <0.8.

Further, the difference Δt between the intervals on the optical axis between the first lens group and the second lens group when the moving focusing optical lens group is in the near photographing and the far photographing, and the sum Σct of the thicknesses on the optical axis of the first lens to the fifth lens of the moving focusing optical lens group respectively satisfy: delta T/ΣCT <0.5.

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

Further, the Abbe number is greater than the lens number V of 50 ₅₀ The method meets the following conditions: v (V) ₅₀ ≥2。

According to another aspect of the present invention, there is provided a moving focus optical lens group comprising, in order from an object side to an imaging side along an optical axis: a first lens group; the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the imaging side surface is a convex surface; when the distance between the shot object and the focusing optical lens group is from far to near, the interval distance between the first lens group and the second lens group on the optical axis is adjusted to execute focusing; the distance TTLi from the object side surface of the first lens to the imaging surface on the optical axis when the movable focusing optical lens group is in far shooting, the half of the diagonal line length of the effective pixel area on the imaging surface when the movable focusing optical lens group is in far shooting, and the half of the maximum field angle Semi-FOVi when the movable focusing optical lens group is in far shooting meet the following conditions: 1< ttli/ImgHi tan (Semi-FOVi) <2.

Further, the movable focusing optical lens group further comprises a diaphragm, and the diaphragm is positioned at the object side of the second lens; the entrance pupil diameter EPD of the moving focus optical lens group and the focal length Fg1 of the first lens group satisfy: 0.2< EPD/Fg1<1.

By applying the technical scheme of the invention, the movable focusing optical lens group sequentially comprises a first lens group and a second lens group from an object side to an imaging side along an optical axis, wherein the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the imaging side surface is a convex surface; when the distance between the shot object and the focusing optical lens group is from far to near, the interval distance between the first lens group and the second lens group on the optical axis is adjusted to execute focusing; the entrance pupil diameter EPD of the moving focus optical lens group and the focal length Fg1 of the first lens group satisfy: 0.2< EPD/Fg1<1.

By reasonably distributing the seventh lens surface type, on one hand, the distortion and astigmatism problems of the whole system can be balanced better, and on the other hand, the method is favorable for acquiring a larger image surface and has higher resolution and better imaging quality. The ratio between the entrance pupil diameter EPD of the movable focusing optical lens group and the focal length Fg1 of the first lens group is in a reasonable range, so that the movable focusing optical lens group still has enough luminous flux under the condition of weak near light to ensure higher illumination of an image plane and maintain excellent imaging quality. In addition, the movable focusing optical lens group of the application adopts seven lenses, so that miniaturization is facilitated, meanwhile, in the actual shooting process, not only can clear imaging capability of a far shot object be maintained, but also enough imaging light rays can be ensured to enter an optical system in near shooting, noise of an imaging picture is reduced, imaging effect of near shooting is improved, and the characteristics of large depth of field and large aperture are facilitated.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

Fig. 1 is a schematic view showing a structure of a moving focus optical lens group according to an example one of the present invention at the time of telephoto;

fig. 2 is a schematic diagram showing a structure of a moving focus optical lens group according to an example of the present invention at the time of close-up shooting;

fig. 3 to 5 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the moving focus optical lens group in fig. 1, respectively;

fig. 6 to 8 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the moving focus optical lens group in fig. 2, respectively;

fig. 9 is a schematic diagram showing a structure of a moving focus optical lens group of the second example of the present invention at the time of telephoto;

fig. 10 is a schematic diagram showing a structure of a moving focus optical lens group of the second example of the present invention at the time of close-up shooting;

fig. 11 to 13 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the moving focus optical lens group in fig. 9, respectively;

fig. 14 to 16 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the moving focus optical lens group in fig. 10, respectively;

fig. 17 is a schematic diagram showing the structure of a moving focus optical lens group of example three of the present invention at the time of telephoto;

fig. 18 is a schematic diagram showing a structure of a moving focus optical lens group of the third example of the present invention at the time of close-up shooting;

Fig. 19 to 21 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the moving focus optical lens group in fig. 17, respectively;

fig. 22 to 24 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the moving focus optical lens group in fig. 18, respectively;

fig. 25 is a schematic diagram showing the structure of a moving focus optical lens group of example four of the present invention at the time of telephoto;

fig. 26 is a schematic diagram showing the structure of a moving focus optical lens group of example four of the present invention at the time of close-up shooting;

fig. 27 to 29 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the moving focus optical lens group in fig. 25, respectively;

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

Wherein the above figures include the following reference numerals:

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

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that 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 unless otherwise indicated.

In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.

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

In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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 near the object side becomes the object side of the lens, and the surface of each lens near the imaging side is referred to as the imaging side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In the object side, when the R value is positive, the object side is judged to be convex, and when the R value is negative, the object side is judged to be concave; in the image forming side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.

The invention provides a movable focusing optical lens group, which aims to solve the problems that the movable focusing optical lens group in the prior art is miniaturized, has a large image plane, has a large depth of field and has a large aperture and is difficult to be simultaneously compatible.

Example 1

As shown in fig. 1 to 32, the movable focusing optical lens group sequentially includes a first lens group and a second lens group from an object side to an imaging side along an optical axis, the second lens group includes at least a seventh lens, an object side surface of the seventh lens is a concave surface, and an imaging side surface is a convex surface; when the distance between the shot object and the focusing optical lens group is from far to near, the interval distance between the first lens group and the second lens group on the optical axis is adjusted to execute focusing; the entrance pupil diameter EPD of the moving focus optical lens group and the focal length Fg1 of the first lens group satisfy: 0.2< EPD/Fg1<1.

Preferably, 0.2< EPD/Fg1<0.5.

In this embodiment, the movable focusing optical lens group further includes a diaphragm, and the diaphragm is located at the object side of the second lens. The diaphragm is located between the object side and the second lens, aperture change can be achieved, photographing requirements are better met, better resolving power can be obtained at the long focal end, and design difficulty is reduced. Meanwhile, the aperture of the lens can be reduced, and miniaturization is facilitated.

In the present embodiment, the distance Um between the subject and the object side surface of the first lens at the time of the near photographing of the moving focus optical lens group satisfies: um is more than or equal to 90mm and less than or equal to 200mm. With the development of the times, the requirements of users on the micro-distance performance are higher and higher, and the movable focusing optical lens group can realize clear imaging at the ultra-short distance of 90mm-200mm, thereby meeting the requirements of clients and being applicable to wider life scenes. Preferably, 100 mm. Ltoreq.um.ltoreq.180 mm.

In this embodiment, the distance TTLi between the object side surface of the first lens element and the imaging surface at the time of the far photographing, the half ImgHi of the diagonal length of the effective pixel area at the imaging surface at the time of the far photographing, and the half Semi-FOVi of the maximum field angle at the time of the far photographing of the moving focusing optical lens element satisfy: 1< ttli/ImgHi tan (Semi-FOVi) <2. The method satisfies the condition, so that the movable focusing optical lens group is thinner as a whole, the image surface is larger, the field angle is larger, the movable focusing optical lens group is ensured to be capable of presenting more detail information of a shot object, and the characteristics of high resolution, large depth of field and large aperture are realized while the miniaturization is satisfied. Preferably 1.2< ttli/ImgHi tan (Semi-FOVi) <1.5.

In this embodiment, a distance TTLi between an object side surface of the first lens in the far photographing and an imaging surface on an optical axis, a half of a diagonal length ImgHi of an effective pixel area of the moving focusing optical lens group on the imaging surface in the far photographing, a distance TTLm between an object side surface of the first lens in the near photographing and an imaging surface on an optical axis of the moving focusing optical lens group, and a half of a diagonal length ImgHm of an effective pixel area of the moving focusing optical lens group on the imaging surface in the near photographing satisfy: TTLi/ImgHi-TTLm/ImgHm <0.15. The system total length is similar when satisfying this conditional expression, is favorable to controlling far and near to clap, and the image surface size is similar, guarantees that this removal focusing optical lens group can not appear installing adverse condition when carrying out the module equipment, guarantees that the removal of second lens group can not take place to interfere with the module end when far and near clap, guarantees simultaneously that the picture changes less when far and near switching, presents more detail information of object, improves user experience. Preferably, |TTLi/ImgHi-TTLm/ImgHm| is less than or equal to 0.1.

In the present embodiment, the focal length Fg1 of the first lens group, the focal length fi of the moving focusing optical lens group at the time of far photographing, and the focal length fm of the moving focusing optical lens group at the time of near photographing satisfy: fg1/fi-Fg1/fm <0.1. The method meets the conditional expression, on one hand, the distortion and astigmatism problems of the whole system can be balanced better, and on the other hand, the focal length change amplitude is ensured to be smaller when the far and near views are switched, and the motor stroke is controlled within a reasonable range.

In the present embodiment, the aperture value fnoi of the moving focus optical lens group at the far photographing and the aperture value fnom of the moving focus optical lens group at the near photographing satisfy: 0.9< fnoi/fnom <1.2. The condition is satisfied, the enough luminous flux can be obtained when the focusing optical lens group is moved under the micro-distance, so that the change amplitude of the whole system is smaller while the image surface has higher illumination, and the motor stroke is controlled within a reasonable range.

In this embodiment, a distance TDm on the optical axis from the object side surface of the first lens to the imaging side surface of the seventh lens when the focusing optical lens group is in the near photographing, a distance TTLm on the optical axis from the object side surface of the first lens to the imaging side surface when the focusing optical lens group is in the near photographing, a distance TDi on the optical axis from the object side surface of the first lens to the imaging side surface of the seventh lens when the focusing optical lens group is in the far photographing, and a distance TTLi on the optical axis from the object side surface of the first lens to the imaging side surface when the focusing optical lens group is in the far photographing satisfy: 0.8< (TDi/TTLi)/(TDm/TTLm) <1. The condition is satisfied, so that a more reasonable back focus value is obtained when the photographing is performed far and near, poor module ends caused by overlarge or undersize back focus are prevented, meanwhile, the working stroke of a motor during focusing is reduced, and the miniaturization of the movable focusing optical lens group is ensured.

In this embodiment, the sum Σct of the thicknesses Σet of the edges of each lens in the moving focus optical lens group and the sum Σct of the thicknesses of the first lens to the fifth lens in the moving focus optical lens group on the optical axis satisfy: 0.5< ΣET/ΣCT <1. The method meets the condition, on one hand, distortion and curvature of the whole system can be balanced better, on the other hand, deformation of each lens is not easy to occur in the assembling process, stability of curvature of the field is greatly facilitated, in addition, the molding and debugging process space is larger, and the parasitic light risk caused by appearance problems of the lens is avoided. Preferably, 0.8< ΣET/ΣCT <1.

In the present embodiment, the edge thickness ET1 of the first lens and the edge thickness ET7 of the seventh lens satisfy: 0.2< ET1/ET7<0.8. The color difference of the whole system can be balanced better by meeting the conditional expression, and the difficulty in the actual processing process is avoided to prevent the risk of deformation in the assembly process, so that the method has great help to the stability of field curvature and simultaneously prevents the occurrence of poor appearance.

In the present embodiment, a sum Σatm of a distance BFLm between an imaging side surface and an imaging surface of a seventh lens in the moving focusing optical lens group on the optical axis at the time of near shooting and a distance Σatm between air gaps between the first lens and the seventh lens in the moving focusing optical lens group on the optical axis at the time of near shooting is satisfied: BFLm/ΣATm <0.5. The method meets the condition, can avoid the problems of interference of front and rear lenses in the assembly process caused by too small clearance on the premise of ensuring enough space of back focus in the near shooting process, and can reasonably adjust the air clearance between the lenses, better balance the distortion of the system, reduce ghost image energy and ensure that the system obtains better imaging quality.

In the present embodiment, the sum Σatm of the distances on the optical axis of the air gaps between the lenses in the first lens to the seventh lens in the near photographing of the moving focus optical lens group and the distance Σt67m of the air gaps between the sixth lens to the seventh lens in the near photographing of the moving focus optical lens group satisfy: 0.3< T67m/ΣATm <0.8. The method meets the conditional expression, can ensure that the structural design of the lens cone and the spacer and the assembly process of the production line are facilitated among the lenses, and can better balance the distortion of the system. In addition, the control of the conditional expression can also reduce the working stroke of the motor during focusing and ensure the miniaturization of the movable focusing optical lens group. Preferably, 0.3< T67m/ΣATm <0.7.

In this embodiment, the difference Δt between the distances between the first lens group and the second lens group on the optical axis when the moving focusing optical lens group is in the near photographing and the far photographing, and the sum Σct of the thicknesses of the first lens to the fifth lens of the moving focusing optical lens group on the optical axis respectively satisfy: delta T/ΣCT <0.5. The requirement of the assembly distance is met, and the interference problem caused by the overlarge distance between the first lens group and the second lens group in the running process of the motor is avoided; on the other hand, the central thickness of each lens is reasonably controlled, and the problems that the lens is difficult to process and assemble and the like due to the fact that the central thickness is too large or too small are avoided. Preferably, Δt/Σct <0.4.

In this embodiment, the refractive index N2 of the second lens, the refractive index N3 of the third lens and the refractive index N4 of the fourth lens satisfy: 4.5< N2+N3+N4<5. The second lens, the third lens and the fourth lens are sensitive lenses, the condition is met, the refractive indexes of the second lens, the third lens and the fourth lens are improved, the performance is improved obviously, and meanwhile, astigmatism, coma and the like can be eliminated better through high-low refractive index interval distribution. Preferably, 4.7< n2+n3+n4<4.9.

In the present embodiment, the Abbe number is greater than 50 ₅₀ The method meets the following conditions: v (V) ₅₀ And is more than or equal to 2. The lens with the Abbe number larger than 50 can effectively control dispersion, and meanwhile, the lens with the Abbe number larger than 50 and low refractive index is superior to the lens with high refractive index in the aspects of molding, appearance, reliability and the like, so that manufacturability is improved, and the difficulty in the actual processing process is avoided, and the yield is ensured.

Example two

As shown in fig. 1 to 32, the movable focusing optical lens group sequentially includes a first lens group and a second lens group from an object side to an imaging side along an optical axis, the second lens group includes at least a seventh lens, an object side surface of the seventh lens is a concave surface, and an imaging side surface is a convex surface; when the distance between the shot object and the focusing optical lens group is from far to near, the interval distance between the first lens group and the second lens group on the optical axis is adjusted to execute focusing; the distance TTLi from the object side surface of the first lens to the imaging surface on the optical axis when the movable focusing optical lens group is in far shooting, the half of the diagonal line length of the effective pixel area on the imaging surface when the movable focusing optical lens group is in far shooting, and the half of the maximum field angle Semi-FOVi when the movable focusing optical lens group is in far shooting meet the following conditions: 1< ttli/ImgHi tan (Semi-FOVi) <2.

Preferably 1.2< ttli/ImgHi tan (Semi-FOVi) <1.5.

By reasonably distributing the seventh lens surface type, on one hand, the distortion and astigmatism problems of the whole system can be balanced better, and on the other hand, the method is favorable for acquiring a larger image surface and has higher resolution and better imaging quality. The distance TTLi from the object side surface of the first lens to the imaging surface when the movable focusing optical lens group is in the far shooting is reasonably restricted, the relation between half of the diagonal line length of the effective pixel area of the movable focusing optical lens group on the imaging surface when the movable focusing optical lens group is in the far shooting and half of the maximum field angle Semi-FOVi of the movable focusing optical lens group when the movable focusing optical lens group is in a reasonable range, so that the movable focusing optical lens group is thinner in whole, larger in image surface and larger in field angle, and the movable focusing optical lens group is ensured to be capable of presenting more detail information of a shot object, and the characteristics of high resolution, large depth of field and large aperture are realized while the miniaturization is met. In addition, the movable focusing optical lens group of the application adopts seven lenses, so that miniaturization is facilitated, meanwhile, in the actual shooting process, not only can clear imaging capability of a far shot object be maintained, but also enough imaging light rays can be ensured to enter an optical system in near shooting, noise of an imaging picture is reduced, imaging effect of near shooting is improved, and the characteristics of large depth of field and large aperture are facilitated.

In the present embodiment, the entrance pupil diameter EPD of the moving focus optical lens group and the focal length Fg1 of the first lens group satisfy: 0.2< EPD/Fg1<1. The ratio between the entrance pupil diameter EPD of the movable focusing optical lens group and the focal length Fg1 of the first lens group is in a reasonable range, so that the movable focusing optical lens group still has enough luminous flux under the condition of weak near light to ensure higher illumination of an image plane and maintain excellent imaging quality. Preferably, 0.2< EPD/Fg1<0.5.

The above-described movable focus optical lens group may optionally further include a filter for correcting color deviation or a protective glass for protecting a photosensitive element located on the imaging surface.

The moving focus optical lens group in the present application may employ a plurality of lenses, for example, seven lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of each lens, the sensitivity can be effectively reduced, the processability can be improved, and the movable focusing optical lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones and the like. The left side is the object side and the right side is the imaging side.

In the present application, at least one of the mirrors of each lens is an aspherical mirror. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses making up the moving focus optical lens group can be varied to achieve the various results and advantages described in the present specification without departing from the technical solutions claimed herein. For example, although seven lenses are described as an example in the embodiment, the moving focus optical lens group is not limited to include seven lenses. The moving focus optical lens group may also include other numbers of lenses, if desired.

Examples of specific surface shapes and parameters applicable to the moving focus optical lens group of the above-described embodiment are further described below with reference to the drawings.

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

Example one

As shown in fig. 1 to 8, a moving focus optical lens group of example one of the present application is described. Fig. 1 is a schematic diagram showing a structure of a moving focus optical lens group of example one at the time of telephoto; fig. 2 is a schematic diagram showing a structure of a moving focus optical lens group of example one at the time of close-up shooting.

As shown in fig. 1 and 2, the moving focus optical lens group includes, in order from an object side to an imaging side: the first lens group G1, the second lens group G2, the optical filter E8 and the imaging surface S17. Wherein, the first lens group G1 includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6; the second lens group G2 includes a seventh lens E7. The diaphragm STO is disposed on the object side of the first lens E1.

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

In this example, the distance TTLi on the optical axis from the object side surface of the first lens to the imaging surface at the time of the telephoto lens group is 11.85mm; the distance TTLm from the object side surface of the first lens to the imaging surface on the optical axis when the focusing optical lens group is in close shooting is 11.85mm; half of the diagonal line length of an effective pixel area on an imaging surface of the movable focusing optical lens group during far shooting is 5.32mm; half of the diagonal length of an effective pixel area on an imaging surface of the movable focusing optical lens group in near shooting is 5.12mm; the focal length fi of the movable focusing optical lens group in long shot is 9.61mm; the focal length fm of the movable focusing optical lens group in the near shooting is 9.42mm; half of the maximum field angle of the movable focusing optical lens group during far shooting is 28.59 degrees; half of the maximum field angle of the moving focusing optical lens group at the time of close photographing was 27.87 °.

Table 1 shows a basic structural parameter table of a moving focus optical lens group of example one, in which the units of radius of curvature, thickness/distance are all millimeters (mm).

TABLE 1

In example one, the object side and the imaging side of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=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 aspherical i-th order. The following Table 2 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S14 in example one.

TABLE 2

Fig. 3 shows an on-axis chromatic aberration curve of the moving focus optical lens group at the time of telephoto for example one, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the moving focus optical lens group. Fig. 4 shows an astigmatism curve of the moving focus optical lens group of example one at the time of telephoto, which indicates meridional image surface curvature and sagittal image surface curvature. Fig. 5 shows a distortion curve of the moving focus optical lens group of example one at the time of telephoto, which represents distortion magnitude values corresponding to different angles of view.

Fig. 6 shows an on-axis chromatic aberration curve of the moving focus optical lens group at the time of near photographing, which indicates a convergent focus deviation of light rays of different wavelengths through the moving focus optical lens group. Fig. 7 shows an astigmatism curve at the time of near shooting of the moving focus optical lens group of example one, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8 shows a distortion curve of the moving focus optical lens group of example one at the time of near shooting, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 3 to 8, the moving focus optical lens assembly according to the example one can achieve good imaging quality.

Example two

As shown in fig. 9 to 16, a moving focus optical lens group of example two of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 9 is a schematic diagram showing a structure of a moving focus optical lens group of example two at the time of telephoto; fig. 10 is a schematic diagram showing a structure of a moving focus optical lens group of example two at the time of close-up shooting.

As shown in fig. 9 and 10, the moving focus optical lens group includes, in order from an object side to an imaging side: the first lens group G1, the second lens group G2, the optical filter E8 and the imaging surface S17. Wherein, the first lens group G1 includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6; the second lens group G2 includes a seventh lens E7. The diaphragm STO is disposed on the object side of the first lens E1.

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

In this example, the distance TTLi on the optical axis from the object side surface of the first lens to the imaging surface at the time of the telephoto lens group is 12.00mm; the distance TTLm from the object side surface of the first lens to the imaging surface on the optical axis when the focusing optical lens group is in close shooting is 12.00mm; half of the diagonal line length of an effective pixel area on an imaging surface of the movable focusing optical lens group during far shooting is 5.32mm; half of the diagonal length of an effective pixel area on an imaging surface of the movable focusing optical lens group in near shooting is 5.12mm; the focal length fi of the movable focusing optical lens group in long shot is 9.22mm; the focal length fm of the movable focusing optical lens group in the near shooting is 8.29mm; half of the maximum field angle of the movable focusing optical lens group during far shooting is 29.99 degrees; half of the maximum field angle of the moving focusing optical lens group at the time of close photographing is 29.98 °.

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

TABLE 3 Table 3

Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example two, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-4.4267E-04

2.2779E-02

-1.3745E-01

5.0326E-01

-1.1777E+00

1.8511E+00

-2.0133E+00

S2

-1.7201E-02

7.1868E-03

3.4802E-02

-1.3752E-01

3.0859E-01

-4.6814E-01

4.9342E-01

S3

-4.0388E-02

1.9801E-02

1.1167E-03

-3.2351E-02

8.9447E-02

-1.5948E-01

1.8713E-01

S4

-3.1912E-02

7.3547E-03

2.5782E-02

-8.7608E-02

1.7109E-01

-2.2797E-01

2.0809E-01

S5

-3.4512E-02

-9.4028E-03

3.0313E-02

-5.9159E-02

7.1380E-02

-4.8584E-02

8.4829E-03

S6

-1.6070E-02

7.0183E-03

-3.3375E-02

6.8083E-02

-8.0777E-02

6.3004E-02

-3.3963E-02

S7

2.6808E-02

2.7627E-02

-1.0933E-01

1.8894E-01

-2.0322E-01

1.4804E-01

-7.5890E-02

S8

-4.9410E-03

1.2149E-02

-1.9878E-02

1.6795E-02

-7.0959E-03

5.4639E-04

1.0343E-03

S9

-1.4227E-02

4.3083E-03

-4.5395E-03

4.6853E-03

-3.0010E-03

1.2612E-03

-3.6869E-04

S10

9.3110E-03

-7.7235E-03

1.0373E-02

-7.6094E-03

3.5888E-03

-1.1479E-03

2.5114E-04

S11

3.6275E-02

-1.7861E-02

1.7561E-02

-1.2966E-02

6.2675E-03

-2.0743E-03

4.8605E-04

S12

2.2090E-02

-1.2646E-02

9.9483E-03

-5.8357E-03

2.2988E-03

-6.3060E-04

1.2427E-04

S13

8.2455E-03

-1.0240E-02

8.1138E-03

-4.2246E-03

1.5331E-03

-3.9855E-04

7.5320E-05

S14

6.5609E-03

-4.9547E-03

2.5057E-03

-8.6050E-04

2.1186E-04

-3.8188E-05

5.0806E-06

Face number

A18

A20

A22

A24

A26

A28

A30

S1

1.5402E+00

-8.3289E-01

3.1610E-01

-8.2276E-02

1.3977E-02

-1.3955E-03

6.2088E-05

S2

-3.6514E-01

1.9031E-01

-6.9374E-02

1.7293E-02

-2.8068E-03

2.6711E-04

-1.1302E-05

S3

-1.4784E-01

8.0462E-02

-3.0410E-02

7.8767E-03

-1.3381E-03

1.3456E-04

-6.0748E-06

S4

-1.3010E-01

5.5547E-02

-1.5946E-02

2.9591E-03

-3.2583E-04

1.7371E-05

-2.0455E-07

S5

1.6405E-02

-1.7734E-02

9.2988E-03

-2.9602E-03

5.7992E-04

-6.4491E-05

3.1223E-06

S6

1.2957E-02

-3.5260E-03

6.8015E-04

-9.0848E-05

7.9890E-06

-4.1594E-07

9.7096E-09

S7

2.7889E-02

-7.3842E-03

1.3970E-03

-1.8424E-04

1.6087E-05

-8.3581E-07

1.9559E-08

S8

-6.3032E-04

1.9683E-04

-3.8926E-05

5.0574E-06

-4.2055E-07

2.0366E-08

-4.3778E-10

S9

7.7500E-05

-1.1854E-05

1.3099E-06

-1.0178E-07

5.2627E-09

-1.6211E-10

2.2448E-12

S10

-3.6558E-05

3.1970E-06

-9.8242E-08

-1.1067E-08

1.4655E-09

-7.0243E-11

1.2892E-12

S11

-8.1828E-05

9.8829E-06

-8.4074E-07

4.8392E-08

-1.7451E-09

3.3636E-11

-2.2519E-13

S12

-1.7879E-05

1.8832E-06

-1.4372E-07

7.7367E-09

-2.7859E-10

6.0224E-12

-5.9100E-14

S13

-1.0406E-05

1.0480E-06

-7.5947E-08

3.8511E-09

-1.2954E-10

2.5944E-12

-2.3397E-14

S14

-4.9943E-07

3.6075E-08

-1.8872E-09

6.9495E-11

-1.7075E-12

2.5127E-14

-1.6752E-16

TABLE 4 Table 4

Fig. 11 shows an on-axis chromatic aberration curve of the moving focus optical lens group at the time of telephoto for example two, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the moving focus optical lens group. Fig. 12 shows an astigmatism curve of the moving focus optical lens group of example two, which indicates meridional image surface curvature and sagittal image surface curvature at the time of telephoto. Fig. 13 shows a distortion curve of the moving focus optical lens group of example two at the time of telephoto, which represents distortion magnitude values corresponding to different angles of view.

Fig. 14 shows an on-axis chromatic aberration curve of the moving focus optical lens group at the time of near photographing for example two, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the moving focus optical lens group. Fig. 15 shows an astigmatism curve at the time of near shooting of the moving focus optical lens group of example two, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16 shows a distortion curve of the moving focus optical lens group of example two at the time of near shooting, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 11 to 16, the moving focus optical lens group of the second example can achieve good imaging quality.

Example three

As shown in fig. 17 to 24, a moving focus optical lens group of example three of the present application is described. Fig. 17 is a schematic diagram showing the structure of a moving focus optical lens group of example three at the time of telephoto; fig. 18 shows a schematic diagram of the structure of the moving focus optical lens group of example three at the time of close-up shooting.

As shown in fig. 17 and 18, the moving focus optical lens group includes, in order from the object side to the imaging side: the first lens group G1, the second lens group G2, the optical filter E8 and the imaging surface S17. Wherein, the first lens group G1 includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6; the second lens group G2 includes a seventh lens E7. The diaphragm STO is disposed on the object side of the first lens E1.

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

In this example, the distance TTLi on the optical axis from the object side surface of the first lens to the imaging surface at the time of the telephoto lens group is 12.00mm; the distance TTLm from the object side surface of the first lens to the imaging surface on the optical axis when the focusing optical lens group is in close shooting is 12.00mm; half of the diagonal length of an effective pixel area on an imaging surface of the movable focusing optical lens group during far shooting is 5.00mm; half of the diagonal length of an effective pixel area on an imaging surface of the movable focusing optical lens group in near shooting is 4.80mm; the focal length fi of the movable focusing optical lens group in long shot is 8.32mm; the focal length fm of the movable focusing optical lens group in the near shooting is 7.86mm; half of the maximum field angle of the movable focusing optical lens group at the time of far shooting is 29.97 degrees; half of the maximum field angle of the moving focusing optical lens group at the time of close photographing was 29.62 °.

Table 5 shows a basic structural parameter table of a moving focus optical lens group of example three, in which the units of radius of curvature, thickness/distance are all millimeters (mm).

TABLE 5

Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example three, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-2.2503E-02

3.8430E-02

-2.0696E-01

6.3158E-01

-1.2449E+00

1.6836E+00

-1.6140E+00

S2

-1.7928E-02

1.2303E-03

-1.1330E-01

4.3456E-01

-9.1402E-01

1.2440E+00

-1.1577E+00

S3

1.4813E-02

1.4092E-02

-1.9548E-01

6.5058E-01

-1.2749E+00

1.6619E+00

-1.5062E+00

S4

1.0558E-02

-1.3719E-02

6.4078E-02

-1.6810E-01

2.8005E-01

-3.2255E-01

2.6639E-01

S5

-3.9018E-02

1.3357E-02

1.4133E-02

-5.4074E-02

8.2194E-02

-8.0230E-02

5.4995E-02

S6

-4.2507E-02

2.0471E-02

-9.8874E-03

8.1022E-03

-1.2998E-02

1.6376E-02

-1.3504E-02

S7

-4.3571E-02

1.1596E-02

-1.2998E-02

1.2449E-02

-5.5713E-03

-2.3998E-03

5.5853E-03

S8

-3.5022E-02

8.4207E-03

-3.8833E-03

-1.8334E-03

6.8829E-03

-7.6694E-03

5.0503E-03

S9

3.5788E-02

-1.3386E-02

-1.8354E-03

1.1926E-02

-1.3477E-02

8.9219E-03

-3.9369E-03

S10

4.4102E-03

-5.8604E-03

6.6855E-03

-3.7965E-03

1.2554E-03

-2.0759E-04

-1.1039E-05

S11

-1.9971E-02

-2.5098E-03

6.0287E-03

-4.0368E-03

1.7147E-03

-5.1334E-04

1.1228E-04

S12

-1.7137E-02

-5.9954E-04

1.9106E-03

-8.1786E-04

1.7195E-04

-7.8718E-06

-6.0067E-06

Face number

A18

A20

A22

A24

A26

A28

A30

S1

1.1155E+00

-5.5820E-01

2.0059E-01

-5.0508E-02

8.4673E-03

-8.4964E-04

3.8641E-05

S2

7.5493E-01

-3.4747E-01

1.1203E-01

-2.4674E-02

3.5206E-03

-2.9165E-04

1.0566E-05

S3

9.6831E-01

-4.4394E-01

1.4398E-01

-3.2231E-02

4.7314E-03

-4.0937E-04

1.5806E-05

S4

-1.6006E-01

7.0021E-02

-2.2037E-02

4.8526E-03

-7.0852E-04

6.1530E-05

-2.4025E-06

S5

-2.7254E-02

9.8295E-03

-2.5569E-03

4.6730E-04

-5.6905E-05

4.1426E-06

-1.3627E-07

S6

7.4840E-03

-2.8509E-03

7.4787E-04

-1.3243E-04

1.5061E-05

-9.8752E-07

2.8160E-08

S7

-4.2094E-03

1.8794E-03

-5.4702E-04

1.0513E-04

-1.2902E-05

9.1819E-07

-2.8873E-08

S8

-2.1965E-03

6.5446E-04

-1.3455E-04

1.8788E-05

-1.7022E-06

9.0290E-08

-2.1286E-09

S9

1.2088E-03

-2.6220E-04

4.0050E-05

-4.2153E-06

2.9093E-07

-1.1847E-08

2.1567E-10

S10

1.5002E-05

-3.9653E-06

5.9607E-07

-5.6708E-08

3.3878E-09

-1.1633E-10

1.7497E-12

S11

-1.8176E-05

2.1748E-06

-1.8972E-07

1.1716E-08

-4.8469E-10

1.2034E-11

-1.3545E-13

S12

1.9700E-06

-3.2991E-07

3.5234E-08

-2.4893E-09

1.1324E-10

-3.0156E-12

3.5801E-14

Fig. 19 shows an on-axis chromatic aberration curve of the moving focus optical lens group at the time of telephoto, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the moving focus optical lens group. Fig. 20 shows an astigmatism curve of the moving focus optical lens group of example three, which indicates meridional image surface curvature and sagittal image surface curvature at the time of telephoto. Fig. 21 shows a distortion curve of the moving focus optical lens group of example three at the time of telephoto, which represents distortion magnitude values corresponding to different angles of view.

Fig. 22 shows an on-axis chromatic aberration curve of the moving focus optical lens group at the time of near photographing, which indicates a convergent focus deviation of light rays of different wavelengths through the moving focus optical lens group. Fig. 23 shows an astigmatism curve at the time of near shooting of the moving focus optical lens group of example three, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 24 shows a distortion curve of the moving focus optical lens group of example three at the time of near shooting, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 19 to 24, the moving focus optical lens group given in example three can achieve good imaging quality.

Example four

As shown in fig. 25 to 32, a moving focus optical lens group of example four of the present application is described. Fig. 25 is a schematic diagram showing the structure of a moving focus optical lens group of example four at the time of telephoto; fig. 26 shows a schematic diagram of the structure of the moving focus optical lens group of example four at the time of close-up shooting.

As shown in fig. 25 and 26, the moving focus optical lens group includes, in order from an object side to an imaging side: the first lens group G1, the second lens group G2, the optical filter E8 and the imaging surface S17. Wherein, the first lens group G1 includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6; the second lens group G2 includes a seventh lens E7. The diaphragm STO is disposed on the object side of the first lens E1.

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

In this example, the distance TTLi on the optical axis from the object side surface of the first lens to the imaging surface at the time of the telephoto lens group is 13.20mm; the distance TTLm from the object side surface of the first lens to the imaging surface on the optical axis when the focusing optical lens group is in close shooting is 13.20mm; half of the diagonal line length of an effective pixel area on an imaging surface of the movable focusing optical lens group during far shooting is 7.35mm; the half of the diagonal line length of the effective pixel area on the imaging surface of the movable focusing optical lens group in the near shooting is 7.15mm; the focal length fi of the movable focusing optical lens group in long shot is 8.81mm; the focal length fm of the movable focusing optical lens group in the near shooting is 8.96mm; half of the maximum field angle of the movable focusing optical lens group during far shooting is 39.27 degrees; half of the maximum field angle of the moving focusing optical lens group at the time of close photographing was 39.03 °.

Table 7 shows a basic structural parameter table of a moving focus optical lens group of example four, in which the units of radius of curvature, thickness/distance are all millimeters (mm).

TABLE 7

Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example four, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

TABLE 8

Fig. 27 shows an on-axis chromatic aberration curve of the moving focus optical lens group at the time of telephoto, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the moving focus optical lens group, of example four. Fig. 28 shows an astigmatism curve of the moving focus optical lens group of example four, which indicates meridional image surface curvature and sagittal image surface curvature at the time of telephoto. Fig. 29 shows a distortion curve of the moving focus optical lens group of example four at the time of telephoto, which represents distortion magnitude values corresponding to different angles of view.

Fig. 30 shows an on-axis chromatic aberration curve of the moving focus optical lens group at the time of near photographing, which indicates a convergent focus deviation of light rays of different wavelengths through the moving focus optical lens group. Fig. 31 shows an astigmatism curve at the time of near shooting of the moving focus optical lens group of example four, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 32 shows a distortion curve of the moving focus optical lens group of example four at the time of near shooting, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 27 to 32, the moving focus optical lens group given in example four can achieve good imaging quality.

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

Condition/example	1	2	3	4
					EPD/Fg1	0.40	0.30	0.47	0.43
TTLi/ImgHi*tan(Semi-FOVi)	1.21	1.30	1.38	1.47
					\|TTLi/ImgHi-TTLm/ImgHm\|	0.09	0.09	0.10	0.05
\|Fg1/fi-Fg1/fm\|	0.02	0.09	0.05	0.01
					fnoi/fnom	1.02	1.11	1.06	0.98
(TDi/TTLi)/(TDm/TTLm)	0.82	0.84	0.89	0.91
					∑ET/∑CT	0.83	0.98	0.88	0.89
ET1/ET7	0.39	0.32	0.24	0.23
					BFLm/∑ATm	0.28	0.18	0.49	0.11
T67m/∑ATm	0.53	0.44	0.50	0.63
					△T/∑CT	0.35	0.27	0.18	0.17
N2+N3+N4	4.89	4.82	4.88	4.75

TABLE 9

Table 10 shows distances TTLi on the optical axis from the object side of the first lens at the time of far photographing to the imaging surface of the moving focusing optical lens group of examples one to four, distances TTLm on the optical axis from the object side of the first lens at the time of near photographing to the imaging surface of the moving focusing optical lens group, half of the diagonal length ImgHi of the effective pixel area on the imaging surface of the moving focusing optical lens group at the time of far photographing, half of the diagonal length ImgHm of the effective pixel area on the imaging surface of the moving focusing optical lens group at the time of near photographing, and the like.

Parameters/examples	1	2	3	4
					TTLi(mm)	11.85	12.00	12.00	13.20
TTLm(mm)	11.85	12.00	12.00	13.20
					ImgHi(mm)	5.32	5.32	5.00	7.35
ImgHm(mm)	5.12	5.12	4.80	7.15
					fi(mm)	9.61	9.22	8.32	8.81
fm(mm)	9.42	8.29	7.86	8.96
					Fg1	7.92	7.58	7.05	7.31
△T(mm)	1.88	1.83	1.07	1.07
					Semi-FOVi(°)	28.59	29.99	29.97	39.27
Semi-FOVm(°)	27.87	29.98	29.62	39.03
					fnoi(mm)	3.00	4.00	2.50	2.80
fnom(mm)	2.95	3.60	2.36	2.85
					TDi(mm)	8.53	9.37	8.97	11.47
TDm(mm)	10.42	11.20	10.04	12.54
					BLi(mm)	3.32	2.63	3.03	1.73
BLm(mm)	1.43	0.80	1.96	0.66
					EPD(mm)	3.20	2.30	3.33	3.15
Um(mm)	100.00	120.00	180.00	150.00
					V ₅₀	3	3	3	3
f1(mm)	6.44	10.56	-36.20	19.46
					f2(mm)	-19.23	-227.06	7.24	-25.57
f3(mm)	-86.22	-13.72	-27.51	15.81
					f4(mm)	11.73	22.67	-19.96	8.39
f5(mm)	26.85	5.14	12.70	-18.26
					f6(mm)	-22.79	-7.40	20.88	-2515.86
f7(mm)	-112.20	-19.72	-21.84	74.76

Table 10

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

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the 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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated 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 the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A moving focus optical lens group, comprising, in order from an object side to an imaging side along an optical axis:

a first lens group;

the second lens group at least comprises a seventh lens, the object side surface of the seventh lens is a concave surface, and the imaging side surface is a convex surface;

when the shot object is far from the movable focusing optical lens group to near, adjusting the interval distance between the first lens group and the second lens group on the optical axis so as to execute focusing; the distance TTLi from the object side surface of the first lens to the imaging surface when the moving focusing optical lens group is in far shooting on the optical axis, and the half of the diagonal length of the effective pixel area of the moving focusing optical lens group on the imaging surface when the moving focusing optical lens group is in far shooting, and the half of the maximum field angle Semi-FOVi when the moving focusing optical lens group is in far shooting, satisfy the following conditions: 1< ttli/ImgHi tan (Semi-FOVi) <2.

2. The moving focus optical lens group of claim 1, further comprising a diaphragm, the diaphragm being located on an object side of the second optic; the entrance pupil diameter EPD of the moving focus optical lens group and the focal length Fg1 of the first lens group satisfy: 0.2< EPD/Fg1<1.

3. The moving focus optical lens group according to claim 1, wherein a distance Um of the subject from an object side surface of the first lens at the time of near shooting satisfies: um is more than or equal to 90mm and less than or equal to 200mm.

4. The moving focus optical lens group according to claim 1, wherein a distance TTLi from an object side surface of a first lens at a time of far photographing to an imaging surface on the optical axis, a half of a diagonal length ImgHi of an effective pixel area on the imaging surface of the moving focus optical lens group at a time of far photographing, a distance TTLm from an object side surface of the first lens at a time of near photographing to the imaging surface of the first lens at a time of near photographing, and a half of a diagonal length ImgHm of the effective pixel area on the imaging surface of the moving focus optical lens group at a time of near photographing satisfy: TTLi/ImgHi-TTLm/ImgHm <0.15.

5. The moving focus optical lens group of claim 1, wherein a focal length Fg1 of the first lens group, a focal length fi of the moving focus optical lens group at a far photographing time, and a focal length fm of the moving focus optical lens group at a near photographing time satisfy: fg1/fi-Fg1/fm <0.1.

6. The moving focus optical lens group according to claim 1, wherein an aperture value fnoi of the moving focus optical lens group at a far shot and an aperture value fnom of the moving focus optical lens group at a near shot satisfy: 0.9< fnoi/fnom <1.2.

7. The moving focus optical lens group according to claim 1, wherein a distance TDm on the optical axis from an object side face of a first lens at a near shooting time to an imaging side face of the seventh lens at the moving focus optical lens group, a distance TTLm on the optical axis from the object side face of the first lens at the near shooting time to the imaging side face, a distance TDi on the optical axis from the object side face of the first lens at a far shooting time to the imaging side face of the seventh lens at the moving focus optical lens group, and a distance TTLi on the optical axis from the object side face of the first lens to the imaging side face at the far shooting time of the moving focus optical lens group satisfy: 0.8< (TDi/TTLi)/(TDm/TTLm) <1.

8. The movable focusing optical lens assembly according to claim 1, wherein a sum Σct of thicknesses Σet of edges of each lens in the movable focusing optical lens assembly and a sum Σct of thicknesses of first to fifth lenses in the movable focusing optical lens assembly on the optical axis respectively satisfy: 0.5< ΣET/ΣCT <1.

9. The moving focus optical lens group of claim 1, wherein between an edge thickness ET1 of the first lens and an edge thickness ET7 of the seventh lens: 0.2< ET1/ET7<0.8.

10. The moving focus optical lens group according to claim 1, wherein a distance BFLm from an imaging side to an imaging surface of the seventh lens at the time of a near-shooting of the moving focus optical lens group to the optical axis and a sum Σatm of distances on the optical axis of an air gap between a first lens to a seventh lens of the moving focus optical lens group at the time of the near-shooting satisfy: BFLm/ΣATm <0.5.