CN118707702B

CN118707702B - A zoom lens

Info

Publication number: CN118707702B
Application number: CN202411204239.0A
Authority: CN
Inventors: 李建华; 何娟娟; 张嘉煌; 金永红; 李赞; 何剑炜; 王嘉佟
Original assignee: Dongguan Yutong Optical Technology Co Ltd
Current assignee: Dongguan Yutong Optical Technology Co Ltd
Priority date: 2024-08-30
Filing date: 2024-08-30
Publication date: 2024-12-27
Anticipated expiration: 2044-08-30
Also published as: CN118707702A

Abstract

The invention discloses a zoom lens, which comprises: a first fixed lens group with positive focal length, a first variable magnification lens group with negative focal length, an aperture, a second variable magnification lens group with positive focal length, a focusing lens group with positive focal length, and a second fixed lens group with negative focal length, which are arranged in sequence along an optical axis from an object side to an image side; the first variable magnification lens group, the second variable magnification lens group and the focusing lens group are all movably arranged between the first fixed lens group and the second fixed lens group; between the first variable magnification lens group and the second variable magnification lens group, a first variable magnification lens group and a focusing lens group are arranged in sequence along an optical axis When the magnification lens group moves in coordination along the direction of the optical axis, the zoom lens achieves magnification; when the focus lens group moves along the direction of the optical axis, the zoom lens achieves zooming; wherein, the focal length FW of the zoom lens at the wide-angle end and the optical distortion DIS1 of the zoom lens at the wide-angle end satisfy: 0.664≤|FW/DIS1|≤1.927; the focal length FT of the zoom lens at the telephoto end and the optical distortion DIS2 of the zoom lens at the telephoto end satisfy: 440.556≤|FT/DIS2|≤8569.115.

Description

Zoom lens

Technical Field

The embodiment of the invention relates to the technical field of optical lenses, in particular to a zoom lens.

Background

The zoom lens can change the focal length within a certain range so as to obtain different wide and narrow view angles, images with different sizes and lenses with different scene ranges, and under the condition of not changing the shooting distance, the shooting range of the zoom lens can be changed by changing the focal length, so that the zoom lens can obtain good shooting effects under different use scenes, and the zoom lens has wide application prospects.

With the development of science and technology, various types of lenses are gradually developed towards miniaturization and refinement, and stricter requirements are also put on the zoom lens. Therefore, how to make the zoom lens have the characteristics of large magnification, large aperture, small distortion and the like becomes the technical problem to be solved urgently at present.

Disclosure of Invention

The invention provides a zoom lens to solve the defects of the prior art, so that the zoom lens has the characteristics of large multiplying power, large aperture, small distortion and the like, thereby meeting the imaging requirement of high quality.

The invention provides a zoom lens, which comprises a first fixed lens group with positive focal power, a first variable lens group with negative focal power, a diaphragm, a second variable lens group with positive focal power, a focusing lens group with positive focal power and a second fixed lens group with negative focal power, wherein the first fixed lens group with positive focal power, the first variable lens group with negative focal power, the diaphragm, the second variable lens group with positive focal power and the second variable lens group with negative focal power are sequentially arranged along an optical axis from an object side to an image side;

The first zoom lens group, the second zoom lens group and the focusing lens group are movably arranged between the first fixed lens group and the second fixed lens group, realize zooming of the zoom lens when the first zoom lens group and the second zoom lens group cooperatively move along the direction of the optical axis, and realize zooming of the zoom lens when the focusing lens group moves along the direction of the optical axis;

wherein, the focal length FW of the zoom lens at the wide-angle end and the optical distortion DIS1 of the zoom lens at the wide-angle end satisfy:

0.664≤|FW/DIS1|≤1.927;

The focal length FT of the zoom lens at the long focal end and the optical distortion DIS2 of the zoom lens at the long focal end meet the following conditions:

440.556≤|FT/DIS2|≤8569.115。

Alternatively to this, the method may comprise, 29.948. Ltoreq. FT/FW.ltoreq. 49.373.

Optionally, the focal length G1 of the first fixed lens group, the focal length G2 of the first variable magnification lens group, the focal length G3 of the second variable magnification lens group, the focal length G4 of the focusing lens group, and the focal length G5 of the second fixed lens group satisfy:

7.952≤G1/FW≤14.532;

-1.407≤G2/FW≤-2.512;

4.019≤G3/FW≤7.625;

2.498≤G4/FW≤4.877;

-8.951≤G5/FW≤-51.307。

Optionally, the maximum movable distance D2 of the first variable magnification lens group, the maximum movable distance D3 of the second variable magnification lens group, and the maximum movable distance D4 of the focus lens group satisfy:

4.806≤|D2/D4|≤6.510;

0.799≤|D3/D4|≤3.897。

optionally, the total optical system length TTL of the zoom lens, the moving distance D2 of the first variable magnification lens group, and the moving distance D3 of the second variable magnification lens group satisfy:

2.871≤|TTL/D2|≤3.253;

3.711≤|TTL/D3|≤11.410。

optionally, the first fixed lens group includes a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, and a fifth lens with positive focal power, which are sequentially arranged along the optical axis from the object side to the image side.

Optionally, the first lens and the second lens form a cemented lens.

Optionally, a focal length f1 of the cemented lens formed by the first lens and the second lens satisfies:

369.802≤|f1/FW|≤664.378。

11.930≤|f1/FT|≤12.674。

62.583≤|f1/(FT/FW)|≤113.731。

Optionally, the object side surface of the first lens is a convex surface;

The object side surface of the second lens is a convex surface, and the image side surface is a concave surface;

the object side surface of the third lens is a convex surface, and the image side surface is a concave surface;

The object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface;

The fifth lens element has a convex object-side surface and a concave image-side surface.

Optionally, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses.

Optionally, the first variable magnification lens group includes a sixth lens with negative focal power, a seventh lens with negative focal power, and an eighth lens with positive focal power, which are sequentially arranged along the optical axis from the object side to the image side.

Optionally, the seventh lens is a glass aspheric lens, and the sixth lens and the eighth lens are both glass spherical lenses.

Optionally, the object side surface of the sixth lens is a convex surface, and the image side surface is a concave surface;

the object side surface of the seventh lens is a concave surface, and the image side surface is a concave surface;

the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a convex surface.

Optionally, the refractive index Nd7 and the abbe number Vd7 of the seventh lens satisfy:

1.45≤Nd7≤1.55;

40.00≤Vd7≤95.00。

optionally, the second variable magnification lens group includes a ninth lens with positive focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power, and a twelfth lens with positive focal power, which are sequentially arranged along the optical axis from the object side to the image side.

Optionally, the tenth lens and the eleventh lens form a cemented lens.

Optionally, the twelfth lens is a glass aspheric lens, and the ninth lens, the tenth lens and the eleventh lens are glass spherical lenses.

Optionally, the object side surface of the ninth lens is a convex surface, and the image side surface is a convex surface;

The object side surface of the tenth lens is a convex surface;

the object side surface of the eleventh lens is a concave surface, and the image side surface is a concave surface;

the twelfth lens element has a convex object-side surface and a concave image-side surface.

Optionally, the refractive index Nd12 and the abbe number Vd12 of the twelfth lens satisfy:

1.45≤Nd12≤1.55;

40.00≤Vd12≤95.00。

Optionally, the focusing lens group includes a thirteenth lens with positive focal power and a fourteenth lens with negative focal power sequentially arranged along the optical axis from the object side to the image side.

Optionally, the thirteenth lens is a glass aspheric lens, and the fourteenth lens is a glass spherical lens.

Optionally, the object side surface of the thirteenth lens is a convex surface, and the image side surface is a convex surface;

The object side surface of the fourteenth lens element is concave, and the image side surface of the fourteenth lens element is convex.

Optionally, the refractive index Nd13 and the abbe number Vd13 of the thirteenth lens satisfy:

1.45≤Nd13≤1.55;

40.00≤Vd13≤95.00。

Optionally, the second fixed lens group includes a fifteenth lens having negative optical power.

Optionally, the fifteenth lens is a glass aspheric lens.

Optionally, the image side surface of the fifteenth lens is concave, and the object side surface is convex.

Optionally, the refractive index Nd15 and the abbe number Vd15 of the fifteenth lens satisfy:

1.45≤Nd15≤1.75;

20.00≤Vd15≤55.00。

According to the technical scheme, the focal power of the first fixed lens group is set to be positive, the focal power of the first variable lens group is set to be negative, the focal power of the second variable lens group is set to be positive, the focal power of the focusing lens group is set to be positive, and the focal power of the second fixed lens group is set to be negative, so that light rays can smoothly pass through the first fixed lens group and reach an imaging surface in a subsequent structure, the zoom lens can have a longer focal length and a larger aperture, and the focal length FW and the optical distortion DIS1 of the zoom lens at the wide angle end meet 0.664 ℃ to be less than or equal to |FW/DIS1| 1.927, and the focal length FT and the optical distortion DIS2 of the zoom lens at the telephoto end meet 440.556 ℃ to be less than or equal to 8569.115.

Drawings

Fig. 1 is a schematic view of a zoom lens at a wide-angle end according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a zoom lens at a middle focal point according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a zoom lens according to an embodiment of the present invention at a telephoto end;

Fig. 4 is a field curvature distortion diagram of a zoom lens at a wide-angle end according to an embodiment of the present invention;

fig. 5 to 7 are light ray fan diagrams of a zoom lens at a wide-angle end according to an embodiment of the present invention;

Fig. 8 is a vertical axis chromatic aberration diagram of a zoom lens at a wide-angle end according to an embodiment of the present invention;

fig. 9 is an axial aberration diagram of a zoom lens at a wide-angle end according to an embodiment of the present invention;

FIG. 10 is a graph of field curvature distortion of a zoom lens at the mid-focal end according to an embodiment of the present invention;

fig. 11 to 13 are light ray fan diagrams of a zoom lens at a middle focal point according to an embodiment of the present invention;

FIG. 14 is a vertical axis chromatic aberration diagram of a zoom lens at a middle focal end according to an embodiment of the present invention;

FIG. 15 is an axial aberration diagram of a zoom lens at a mid-focal end according to an embodiment of the present invention;

FIG. 16 is a graph of field curvature distortion of a zoom lens at a telephoto end according to an embodiment of the present invention;

fig. 17 to 19 are light ray fan diagrams of a zoom lens at a telephoto end according to an embodiment of the present invention;

FIG. 20 is a vertical chromatic aberration diagram of a zoom lens at a telephoto end according to an embodiment of the present invention;

FIG. 21 is an axial aberration diagram of a zoom lens at a telephoto end according to an embodiment of the present invention;

fig. 22 is a schematic view of a structure of another zoom lens at a wide-angle end according to an embodiment of the present invention;

FIG. 23 is a schematic diagram of a zoom lens according to another embodiment of the present invention at a mid-focal-length end;

Fig. 24 is a schematic structural diagram of another zoom lens according to an embodiment of the present invention at a telephoto end;

fig. 25 is a field curvature distortion diagram of another zoom lens at the wide-angle end according to an embodiment of the present invention;

fig. 26 to 28 are light ray fan diagrams of another zoom lens according to an embodiment of the present invention at the wide-angle end;

Fig. 29 is a vertical axis chromatic aberration diagram at the wide-angle end of another zoom lens provided by an embodiment of the present invention;

fig. 30 is an axial aberration diagram of another zoom lens at the wide-angle end according to an embodiment of the present invention;

FIG. 31 is a graph showing distortion of field curvature at the mid-focal end of another zoom lens according to an embodiment of the present invention;

fig. 32 to 34 are light ray fan diagrams of another zoom lens according to an embodiment of the present invention at a mid-focal end;

FIG. 35 is a diagram showing a chromatic aberration of a zoom lens at a mid-focal end according to another embodiment of the present invention;

FIG. 36 is an axial aberration diagram of another zoom lens according to an embodiment of the present invention at the mid-focal end;

FIG. 37 is a graph of field curvature distortion for another zoom lens at the telephoto end according to an embodiment of the present invention;

fig. 38 to 40 are light ray fan diagrams of another zoom lens according to an embodiment of the present invention at a telephoto end;

FIG. 41 is a vertical chromatic aberration diagram of another zoom lens according to an embodiment of the present invention at a telephoto end;

FIG. 42 is an axial aberration diagram of another zoom lens according to an embodiment of the present invention at a telephoto end;

fig. 43 is a schematic view of a structure of still another zoom lens at a wide-angle end provided by an embodiment of the present invention;

FIG. 44 is a schematic view of a zoom lens according to an embodiment of the present invention at a mid-focal-length end;

FIG. 45 is a schematic view of a zoom lens according to an embodiment of the present invention at a telephoto end;

Fig. 46 is a field curvature distortion diagram of still another zoom lens at the wide-angle end provided by an embodiment of the present invention;

Fig. 47 to 49 are ray fan diagrams of still another zoom lens according to an embodiment of the present invention at the wide-angle end;

fig. 50 is a vertical axis chromatic aberration diagram at the wide-angle end of still another zoom lens provided by an embodiment of the present invention;

FIG. 51 is an axial aberration diagram of still another zoom lens at the wide-angle end according to an embodiment of the present invention;

FIG. 52 is a graph of field curvature distortion at the mid-focal end of a further zoom lens according to an embodiment of the present invention;

fig. 53 to 55 are light ray fan diagrams of a zoom lens according to another embodiment of the present invention at a mid-focal end;

FIG. 56 is a diagram of chromatic aberration of a zoom lens at the mid-focal end according to still another embodiment of the present invention;

FIG. 57 is an axial aberration diagram of a zoom lens at the mid-focal end according to another embodiment of the present invention;

FIG. 58 is a graph of field curvature distortion of a zoom lens at the telephoto end according to an embodiment of the present invention;

fig. 59 to 61 are light ray fan diagrams of a zoom lens according to another embodiment of the present invention at a telephoto end;

FIG. 62 is a vertical axis chromatic aberration diagram of a zoom lens at a telephoto end according to another embodiment of the present invention;

fig. 63 is an axial aberration diagram of still another zoom lens according to an embodiment of the present invention at a telephoto end.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be fully described below by way of specific embodiments with reference to the accompanying drawings in the examples of the present invention. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present invention and that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention, as will be apparent to those skilled in the art. Accordingly, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims (the claims) and their equivalents.

Moreover, the use of the terms first, second, and the like in the embodiments of the present disclosure does not denote any order, quantity, or importance, but rather the terms first, second, and the like are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed. In addition, the descriptions of identical, equal, etc. in the embodiments of the present disclosure do not represent that two objects are completely equal in size and shape, and are allowed to be substantially identical, substantially equal, within a certain error range.

The embodiments provided by the embodiments of the present invention may be combined with each other without contradiction.

The embodiment of the invention provides a zoom lens, which comprises a first fixed lens group 10 with positive focal power, a first variable lens group 20 with negative focal power, a diaphragm 60, a second variable lens group 30 with positive focal power, a focusing lens group 40 with positive focal power and a second fixed lens group 50 with negative focal power, wherein the first variable lens group 20, the second variable lens group 30 and the focusing lens group 40 are movably arranged between the first fixed lens group 10 and the second fixed lens group 50, zooming of the zoom lens is realized when the first variable lens group 20 and the second variable lens group 30 are cooperatively moved along the direction of the optical axis, zooming of the zoom lens is realized when the focusing lens group 40 is moved along the direction of the optical axis, wherein the focal length FW of the zoom lens at the wide angle end and the optical distortion DIS1 of the zoom lens at the wide angle end meet 0.664-DIS 1/1.927-4, and the focal length FW 2-4-DIS 2.

In the zoom lens provided in the present embodiment, the first fixed lens group 10, the first variable magnification lens group 20, the second variable magnification lens group 30, the focus lens group 40, and the second fixed lens group 50 may be disposed in one barrel (not shown in fig. 1 to 3). The first fixed lens group 10 and the second fixed lens group 50 are fixed in position in the barrel, and at this time, the first fixed lens group 10 and the second fixed lens group 50 remain stationary with respect to the image plane. The first variable magnification lens group 20, the second variable magnification lens group 30 and the focusing lens group 40 are reciprocally movable along the optical axis in the lens barrel, and play a role in zooming when the first variable magnification lens group 20 and the second variable magnification lens group 30 are moved, and play a role in focusing when the focusing lens group 40 is moved, and the focal length of the zoom lens can be continuously changed from the wide angle to the telephoto by the common movement of the first variable magnification lens group 20, the second variable magnification lens group 30 and the focusing lens group 40.

It will be appreciated that in zooming by moving the first variable magnification lens group 20, the second variable magnification lens group 30, and the focus lens group 40, the zoom lens is located at the wide angle end when the focal length is shortest, and at the telephoto end when the focal length is longest, and has different focal lengths and optical powers at the wide angle end and the telephoto end, and also has different lengths or forms.

In this embodiment, when the zoom lens is at the wide-angle end, the focal length of the zoom lens is shortest, the ratio of the focal length FW thereof to the optical distortion DIS1 thereof at that time satisfies 0.664.ltoreq.FW/DIS 1.ltoreq. 1.927, that is, the ratio of the focal length FW of the zoom lens to the optical distortion DIS1 thereof at that time is a small value, so that the zoom lens can have small optical distortion, when the zoom lens is at the telephoto end, the focal length of the zoom lens is longest, the ratio of the focal length FT thereof to the optical distortion DIS2 thereof at that time satisfies 440.556.ltoreq.FT/DIS 2.ltoreq. 8569.115, that is, the ratio of the focal length FT of the zoom lens to the optical distortion DIS2 thereof at that time is a large value, and as such that the zoom lens can have small optical distortion, and thus the zoom lens can have high imaging quality at both the wide-angle end and the telephoto end.

It should be noted that, the focal power is equal to the difference between the convergence of the image beam and the convergence of the object beam, and the value is the reciprocal of the focal length, which characterizes the ability of the optical system to deflect light. The greater the absolute value of the optical power, the greater the ability to bend the light, the smaller the absolute value of the optical power, and the weaker the ability to bend the light. The refractive power of the light is positive, the refractive power of the light is convergent, and the refractive power of the light is negative, the refractive power of the light is divergent. The optical power may be suitable for characterizing a refractive surface of a lens (i.e. a surface of a lens), for characterizing a lens, or for characterizing a system of lenses together (i.e. a lens group).

In this embodiment, by making the first fixed lens group 10 have positive power, the first variable power lens group 20 has negative power, the second variable power lens group 30 has positive power, the focusing lens group 40 has positive power, and the second fixed lens group 50 has negative power, so that the powers of the lens groups cooperate with each other, ensuring that the zoom lens can have a larger aperture and a longer focal length, and at the same time, after light enters through the first fixed lens group 10, the light can smoothly pass through the lens groups, which is beneficial to reducing aberration and chromatic aberration of the zoom lens, and ensuring that the zoom lens has higher imaging quality.

In addition, a diaphragm 60 is further disposed between the first variable magnification lens group 20 and the second variable magnification lens group 30, and the diaphragm 60 can adjust the propagation direction of the light beam, which is beneficial to improving the imaging quality. By arranging the diaphragm 60 between the two zoom lens groups, the advanced aberration of the zoom lens can be controlled at the front end, the rear end of the zoom lens is ensured to have higher image height, the imaging target surface is enlarged, and meanwhile, the imaging quality is improved, so that the zoom lens can be suitable for different application scenes.

In summary, the zoom lens provided in this embodiment may have a longer focal length, a larger aperture, and a larger magnification, and may have smaller optical distortion at both the wide-angle end and the telephoto end, so as to meet the imaging requirement of high quality, and make the zoom lens applicable to more application scenarios.

Alternatively to this, the method may comprise, 29.948. Ltoreq. FT/FW.ltoreq. 49.373. Meanwhile, through setting up the focal length FT of the zoom lens in the long focal end and focal length FW ratio of wide angle end, under the precondition that the zoom lens has great zoom magnification and imaging target surface, can control the optical distortion in a reasonable small range, can better amplify the detail of the required imaging picture, will not influence the imaging effect at the same time, meet the high-quality imaging requirement under each multiplying power.

Optionally, the focal length G1 of the first fixed lens group 10, the focal length G2 of the first variable magnification lens group 20, the focal length G3 of the second variable magnification lens group 30, the focal length G4 of the focusing lens group 40, and the focal length G5 of the second fixed lens group 50 satisfy 7.952.ltoreq.G1/FW.ltoreq. 14.532, -1.407.ltoreq.G2/FW.ltoreq.2.512, -4.019.ltoreq.G3/FW.ltoreq.7.625, and-2.498.ltoreq.G4/FW. 4.877, -8.951.ltoreq.G5/FW.ltoreq. 51.307.

Therefore, by reasonably distributing the focal length of each lens group, the high-grade aberration of the lens can be corrected to a great extent when light rays pass through each lens group smoothly, and the imaging quality is improved.

Alternatively, the maximum movable distance D2 of the first variable magnification lens group 20, the maximum movable distance D3 of the second variable magnification lens group 30, and the maximum movable distance D4 of the focus lens group 40 satisfy 4.806.ltoreq.D2/D4.ltoreq.6.510, and 0.799.ltoreq.D3/D4.ltoreq. 3.897. By the arrangement, the focal length change is stable when the zoom lens zooms, and the quick focusing can be realized, and meanwhile, the volume of the focusing lens group 40 can be reduced to a great extent, so that the volume of the zoom lens is reduced.

Alternatively, the total optical system length TTL of the zoom lens, the moving distance D2 of the first variable magnification lens group 20, and the moving distance D3 of the second variable magnification lens group 30 satisfy 2.871. Ltoreq.TTL/D2. Ltoreq.3.253, 3.711. Ltoreq.TTL/D3. Ltoreq.11.410.

The present embodiment sets the value range of the ratio of the total optical length TTL of the zoom lens to the moving distance D2 of the first zoom lens group 20 and the value range of the ratio of the total optical length TTL of the zoom lens to the moving distance D3 of the second zoom lens group 30, so that the zoom lens has a smaller total optical length on the premise of meeting the moving distances of the first zoom lens group 20 and the second zoom lens group 30, thereby further reducing the volume of the zoom lens, and further enabling the zoom lens to be suitable for more application scenes while the zoom lens can meet the high-quality imaging requirement and the requirement of a larger zoom range.

It is understood that each lens group in the embodiment of the present invention may be composed of at least one lens having optical power, that is, the number of lenses having optical power in each lens group may be 1 or any integer greater than 1, and the number of lenses having optical power in each lens group is not specifically limited on the premise that the core point of the embodiment of the present invention can be achieved. The specific structure of each lens group in the zoom lens provided in the embodiment of the present invention is exemplarily described below with respect to a typical example.

Optionally, the first fixed lens group 10 includes a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with positive optical power, a fourth lens L4 with positive optical power, and a fifth lens L5 with positive optical power, which are sequentially arranged along the optical axis from the object side to the image side.

Optionally, the object side of the first lens element L1 is convex, i.e., the first lens element L1 may be a convex-concave lens element or a convex-convex lens element, the object side of the second lens element L2 is convex, the image side of the second lens element L2 is concave, i.e., the second lens element L2 is a convex-concave lens element, the object side of the third lens element L3 is convex, the image side of the third lens element L3 is concave, i.e., the third lens element L3 is a convex-concave lens element, the object side of the fourth lens element L4 is convex, i.e., the fourth lens element L4 is a convex-concave lens element, the object side of the fifth lens element L5 is convex, i.e., the image side of the fifth lens element L5 is concave. By the arrangement, after the light of the object space enters the first fixed lens group 10, the light can smoothly penetrate through each lens of the first fixed lens group 10, so that optical distortion can be effectively reduced, and imaging quality is improved.

Optionally, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all glass spherical lenses.

The glass lens has strong light turning capability, and the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are glass spherical lenses, so that the quantity of lenses is reduced, and the volume of the zoom lens is reduced. Meanwhile, the glass lens has the characteristics of high temperature resistance and low temperature resistance, and the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are arranged as glass spherical lenses, so that the application of the zoom lens in a high-temperature or low-temperature environment is facilitated. It is understood that the material of the glass spherical lens is various types of glass known to those skilled in the art, and the embodiment of the present invention is not repeated and limited.

In this embodiment, the first fixed lens group 10 may be composed of five lenses with optical power, and by reasonably distributing the optical power of the five lenses, the optical power of the first fixed lens group 10 can be positive, so that the zoom lens has a larger aperture and a larger angle of view, and in addition, by reasonably distributing the optical power of each lens in the first fixed lens group 10, it is ensured that light rays enter from the first lens L1 and smoothly pass through each subsequent lens, thereby meeting the requirement of high-quality imaging.

Optionally, the first lens L1 and the second lens L2 constitute a cemented lens.

In addition, the bonding lens formed by the first lens L1 and the second lens L2 can reduce chromatic aberration to the greatest extent or eliminate chromatic aberration, so that various aberrations of the zoom lens can be sufficiently corrected, the resolution can be improved, the optical performance such as distortion and the like can be optimized, light quantity loss caused by reflection among lenses can be reduced, illumination can be improved, and the image quality and the imaging definition of the lens can be improved. In addition, after the first lens L1 and the second lens L2 form the cemented lens, assembly components between lenses can be reduced, an assembly procedure in a lens manufacturing process is simplified, cost is reduced, and tolerance sensitivity problems of the lens unit due to inclination/core shift and the like in the assembly process are reduced.

Optionally, the focal length f1 of the cemented lens composed by the first lens L1 and the second lens L2 satisfies 369.802.ltoreq.f1/FW.ltoreq. 664.378.

Optionally, the focal length f1 of the cemented lens composed by the first lens L1 and the second lens L2 satisfies 11.930.ltoreq.f1/FT.ltoreq. 12.674.

In this way, by setting the focal length range of the cemented lens formed by the first lens L1 and the second lens L2, the light of the object side can be smoothly received in the optical system of the zoom lens, and thus the higher-order aberration can be corrected to a great extent.

Alternatively, the focal length f1 of the cemented lens composed of the first lens L1 and the second lens L2 may also satisfy 62.583.ltoreq.f1/(FT/FW). Ltoreq. 113.731. Thus, the zoom lens can be ensured to realize a high magnification of more than 40 times, and the small-size characteristic of the zoom lens is satisfied.

Optionally, the first variable power lens group 20 includes a sixth lens L6 with negative optical power, a seventh lens L7 with negative optical power, and an eighth lens L8 with positive optical power, which are sequentially arranged along the optical axis from the object side to the image side.

Optionally, the object side surface of the sixth lens element L6 is convex, the image side surface is concave, i.e., the sixth lens element L6 is a convex-concave lens element, the object side surface of the seventh lens element L7 is concave, the image side surface is concave, i.e., the seventh lens element L7 is a concave-concave lens element, the object side surface of the eighth lens element L8 is convex, and the image side surface is convex, i.e., the eighth lens element L8 is a convex-convex lens element.

Optionally, the seventh lens L7 is a glass aspheric lens, and the sixth lens L6 and the eighth lens L8 are glass spherical lenses.

In this way, the spherical lens and the aspherical lens are matched, and the aspherical lens is positioned between the two spherical lenses, so that high-grade aberration can be well corrected, and the imaging quality is improved.

In an alternative embodiment, the refractive index Nd7 and Abbe number Vd7 of the seventh lens L7 satisfy that Nd7 is 1.45.ltoreq.Nd 7.ltoreq.1.55, vd7 is 40.00.ltoreq.Vd7.ltoreq.95.00.

In this embodiment, the first zoom lens group 20 is composed of three lenses with optical power, and the optical power of the three lenses is reasonably distributed, so that the optical power of the first zoom lens group 20 is negative, light rays can be ensured to smoothly penetrate through each lens of the first zoom lens group 20, and the requirement of high-quality imaging is met.

Optionally, the second variable magnification lens group 30 includes a ninth lens L9 with positive optical power, a tenth lens L10 with positive optical power, an eleventh lens L11 with negative optical power, and a twelfth lens L12 with positive optical power, which are sequentially arranged along the optical axis from the object side to the image side.

Optionally, the object-side surface of the ninth lens element L9 is convex, the image-side surface of the ninth lens element L9 is convex, the object-side surface of the tenth lens element L10 is convex, the tenth lens element L10 may be convex or concave, the object-side surface of the eleventh lens element L11 is concave, the image-side surface of the eleventh lens element L11 is concave, the object-side surface of the twelfth lens element L12 is convex, and the image-side surface of the twelfth lens element L12 is concave.

Optionally, the tenth lens L10 and the eleventh lens L11 constitute a cemented lens.

In addition, the bonding lens formed by the tenth lens L10 and the eleventh lens L11 can furthest reduce chromatic aberration or eliminate chromatic aberration, so that various aberrations of the zoom lens can be fully corrected, the resolution can be improved, the optical performance such as distortion and the like can be optimized, the light quantity loss caused by reflection among lenses can be reduced, the illumination can be improved, and the image quality and the imaging definition of the lens can be improved. In addition, after the tenth lens L10 and the eleventh lens L11 form a cemented lens, assembly components between lenses can be reduced, an assembly process in a lens manufacturing process can be simplified, cost can be reduced, and tolerance sensitivity problems of the lens unit due to tilting/decentering and the like generated in the assembly process can be reduced.

Optionally, the twelfth lens L12 is a glass aspheric lens, and the ninth lens L9, the tenth lens L10 and the eleventh lens L11 are glass spherical lenses.

In this way, the spherical lens and the aspherical lens are matched, so that advanced aberration can be well corrected, and imaging quality is improved, and meanwhile, the aspherical lens and the spherical lens are both glass lenses, so that the application of the zoom lens in high and low temperature environments is facilitated.

Optionally, the refractive index Nd12 and Abbe number Vd12 of the twelfth lens L12 satisfy that Nd12 is more than or equal to 1.45 and less than or equal to 1.55, vd12 is more than or equal to 40.00 and less than or equal to 95.00.

In this embodiment, the second zoom lens group 30 is composed of four lenses with optical power, and the optical power of the four lenses is reasonably distributed, so that the optical power of the second zoom lens group 30 is positive, and light rays can be ensured to smoothly penetrate through each lens of the second zoom lens group 30, thereby meeting the requirement of high-quality imaging.

Optionally, the focusing lens group 40 includes a thirteenth lens L13 with positive optical power and a fourteenth lens L14 with negative optical power, which are sequentially arranged along the optical axis from the object side to the image side.

Optionally, the thirteenth lens element L13 has a convex object-side surface, and the image-side surface is convex, i.e., the thirteenth lens element L13 is a convex lens element, and the fourteenth lens element L14 has a concave object-side surface and a convex image-side surface, i.e., the fourteenth lens element L14 is a concave-convex lens element.

Optionally, the thirteenth lens L13 is a glass aspheric lens, and the fourteenth lens L14 is a glass spherical lens. In this way, the spherical lens and the aspherical lens are matched, so that advanced aberration can be well corrected, and imaging quality is improved, and meanwhile, the aspherical lens and the spherical lens are both glass lenses, so that the application of the zoom lens in high and low temperature environments is facilitated.

Optionally, the refractive index Nd13 and Abbe number Vd13 of the thirteenth lens are 1.45-1.55, 40.00-95.00 and Nd 13.

In this embodiment, the focusing lens group 40 is composed of two lenses with optical power, and the optical power of the two lenses is reasonably distributed, so that the optical power of the focusing lens group 40 is positive, light rays can be ensured to smoothly penetrate through each lens of the focusing lens group 40, and the requirement of high-quality imaging is met.

Optionally, the second fixed lens group 50 includes a fifteenth lens L15 having negative optical power.

Optionally, the image side surface of the fifteenth lens element L15 is concave, and the object side surface is convex, i.e., the fifteenth lens element L15 is provided with a concave-convex lens element, so that the light rays can be better contracted, and when reaching the imaging surface, the light rays can be clearly imaged.

Optionally, the fifteenth lens L15 is a glass aspherical lens. In this way, advanced aberrations, such as geometrical aberrations, can be corrected by providing the fifteenth lens L15, thereby contributing to an improvement in imaging quality of the zoom lens.

Optionally, the refractive index Nd15 and Abbe number Vd15 of the fifteenth lens are 1.45-1.75, 20.00-55.00 and Nd 15.

In this embodiment, the second fixed lens group 50 is composed of one lens with optical power, that is, the fifteenth lens L15 with negative optical power, and the fifteenth lens L15 is combined with each lens in the other lens groups to ensure smooth transmission of light rays and meet the requirement of high imaging quality.

In summary, the zoom lens provided by the embodiment of the invention may be composed of fifteen lenses with optical power, wherein five lenses are glass aspheric lenses, ten lenses are glass spherical lenses, and the optical power of each lens is reasonably distributed by combining the glass spherical lenses with the glass aspheric lenses, so that the zoom lens provided by the embodiment of the invention has the characteristics of large aperture, large magnification, long focal length, small distortion and small volume, meets the imaging requirement of high quality, and is suitable for more application scenes.

In an exemplary embodiment, table 1 details parameters of each lens group in the zoom lens provided in the embodiment of the present invention in a possible implementation, and the zoom lens in table 1 corresponds to the zoom lens shown in fig. 1 to 3.

TABLE 1 parameter design for lens groups in zoom lens

Table 2 details specific optical physical parameters of each lens in the zoom lens provided in the embodiment of the present invention in a possible manner, table 2 corresponds to the zoom lens shown in table 1.

TABLE 2 design values of an optical physical parameter for each lens in a zoom lens

As shown in fig. 1 to 3, the zoom lens provided in the present embodiment is composed of fifteen lenses having optical power and other structures having no optical power, that is, the zoom lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a diaphragm 60, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15, and a plate glass L16, which are sequentially arranged along the optical axis from the object side to the image side, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a first variable power lens group 10, the sixth lens L6, the seventh lens L7, and the eighth lens L5 constitute a first variable power lens group 20, the ninth lens L9, the tenth lens L10, the eleventh lens L11, and the eleventh lens L12 constitute a second variable power lens L14, and the thirteenth lens L15 constitute a first fixed lens group 10, the thirteenth lens L1, the thirteenth lens L2, the thirteenth lens L10 and the thirteenth lens L12 constitute a fifteenth lens L14, and the thirteenth lens L10 constitute a cemented lens L10.

The surface numbers are numbered according to the surface sequence of each lens, for example, the surface number 1 represents the object side surface of the first lens L1, the surface number 2 represents the bonding surface of the first lens L1 and the second lens L2, and so on, the curvature radius represents the bending degree of the lens surface in mm, the positive value represents the bending of the surface to the image surface side, the negative value represents the bending of the surface to the object surface side, "INF" represents the surface in plane, the curvature radius in infinity, the thickness represents the central axial distance from the current surface to the next surface in mm, the refractive index represents the deflection capability of the material from the current surface to the next surface in light, the space represents the current position in air, the refractive index in 1, the Abbe number represents the dispersion characteristic of the material from the current surface to the next surface in light, and the half caliber is the effective radius of the lens surface in mm.

Table 3 shows, in one possible embodiment, different zoom intervals at the wide-angle end, the mid-focal end, and the telephoto end of the zoom lens, respectively, table 3 corresponding to the zoom lens shown in table 1.

Table 3 zoom interval design value of zoom lens

The aspherical surface shape equation z of the aspherical lens in the zoom lens of the present embodiment may be expressed in any feasible manner, for example, z may satisfy the following formula:

Wherein r represents the vertical distance from the optical axis, z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the r position along the direction perpendicular to the optical axis, c is the curvature of the fitting spherical surface, the numerical value is the inverse of the curvature radius, k is the fitting conical coefficient, and A, B, C, D, E, F and G are the 4 th, 6 th, 8 th, 10 th, 12 th, 14 th and 16 th order polynomial coefficients of the aspheric surface polynomial respectively.

Table 4 details, by way of example, the aspherical coefficients of each lens in the zoom lens of this example in one possible implementation.

Table 4 design value of one aspherical coefficient for each lens in zoom lens

Wherein, -5.050393E-04 denotes that the coefficient A of the face number 13 is-5.050393 ×10 ^-4, and so on.

Based on the above parameter design, the technical indexes of the zoom lens provided in the present embodiment are shown in table 5.

Table 5 shows technical indexes of zoom lens

In this embodiment, fig. 4 is a field curvature distortion chart of the zoom lens shown in fig. 1 at the wide-angle end, as shown in fig. 4, in a left coordinate system of the chart, a horizontal coordinate represents a field curvature size in mm, a vertical coordinate represents a normalized image height in no unit, where T represents meridian and S represents arc loss, as can be seen from fig. 4, the zoom lens provided in this embodiment is effectively controlled on the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small during imaging, in a right coordinate system, a horizontal coordinate represents a distortion size in unit of;, a vertical coordinate represents a normalized image height in no unit, and as can be seen from fig. 4, the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

Fig. 5 to 7 are ray fan diagrams of the zoom lens shown in fig. 1 at the wide-angle end, and as shown in fig. 5 to 7, the abscissa indicates the beam aperture and the ordinate indicates the chromatic aberration. The most ideal curve is a straight line which coincides with the abscissa, which means that all the light rays are converged at the same point on the image plane, and the corresponding interval on the ordinate of the curve is the maximum dispersion range of the light beam on the ideal plane. The light fan graph can reflect monochromatic aberration with different wavelengths and can also show the magnitude of vertical axis chromatic aberration. As can be seen from fig. 5 to fig. 7, the zoom lens has better wavelengths (specifically 436nm, 486nm, 546nm, 588nm, and 656 nm) close to the abscissa under each view field, which indicates that the chromatic aberration of each wavelength of the system is better corrected, and meanwhile, each wavelength has no obvious dispersion, which indicates that the chromatic aberration of the system is better corrected, thereby ensuring that the zoom lens can realize high-resolution imaging requirements.

Fig. 8 is a vertical chromatic aberration diagram of the zoom lens shown in fig. 1 at the wide-angle end, in which, in a vertical chromatic aberration curve, the normalization of the field of view is shown in fig. 8, 0 is shown on the optical axis, 546nm is used as the dominant wavelength, and the offset from the dominant wavelength is shown in microns (um) in the horizontal direction. As can be seen from fig. 8, the chromatic aberration of the vertical axis of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a good range, which indicates that the chromatic aberration of the vertical axis of the zoom lens at the wide-angle end is better controlled, and the wide-spectrum application requirement can be met.

Fig. 9 is an axial aberration diagram of the zoom lens shown in fig. 1 at the wide-angle end, in which, in an axial aberration curve, the vertical direction indicates normalization of aperture, 0 indicates that the vertical direction vertex indicates the maximum pupil radius on the optical axis, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset amount relative to the dominant wavelength in millimeters (mm), as shown in fig. 9. As can be seen from fig. 9, axial aberrations of normalized apertures of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3 nm) are controlled within a reasonable range, which indicates that the chromatic aberration of the zoom lens at the wide-angle end is better controlled.

Fig. 10 is a graph of distortion of field curvature of the zoom lens shown in fig. 2 at the middle focal end, wherein, in a left coordinate system shown in fig. 10, horizontal coordinates represent the magnitude of field curvature in mm, vertical coordinates represent normalized image height in no unit, wherein T represents meridian and S represents arc loss, as can be seen from fig. 10, the zoom lens provided in this embodiment is effectively controlled on field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small during imaging, in a right coordinate system, horizontal coordinates represent the magnitude of distortion in unit of; vertical coordinates represent normalized image height in no unit, and as can be seen from fig. 10, distortion of the zoom lens provided in this embodiment is well corrected and imaging distortion is small.

Fig. 11 to 13 are ray fan diagrams of the zoom lens shown in fig. 2 at the mid-focal end, and as shown in fig. 11 to 13, the abscissa indicates the beam diameter and the ordinate indicates the chromatic aberration. The most ideal curve is a straight line which coincides with the abscissa, which means that all the light rays are converged at the same point on the image plane, and the corresponding interval on the ordinate of the curve is the maximum dispersion range of the light beam on the ideal plane. The light fan graph can reflect monochromatic aberration with different wavelengths and can also show the magnitude of vertical axis chromatic aberration. As can be seen from fig. 11 to fig. 13, the zoom lens has better wavelengths (specifically 436nm, 486nm, 546nm, 588nm, and 656 nm) close to the abscissa under each view field, which indicates that the chromatic aberration of each wavelength of the system is better corrected, and meanwhile, each wavelength has no obvious dispersion, which indicates that the chromatic aberration of the system is better corrected, so that the zoom lens can realize the high-resolution imaging requirement.

Fig. 14 is a vertical chromatic aberration diagram of the zoom lens shown in fig. 2 at the mid-focal end, wherein in the vertical chromatic aberration curve, the vertical direction indicates the normalization of the field of view, 0 indicates on the optical axis, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset relative to the dominant wavelength in micrometers (um). As can be seen from fig. 14, the chromatic aberration of the vertical axis of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a good range, which indicates that the chromatic aberration of the vertical axis of the zoom lens at the wide-angle end is better controlled, and the wide-spectrum application requirement can be met.

Fig. 15 is an axial aberration diagram of the zoom lens shown in fig. 2 at the mid-focal end, wherein in an axial aberration curve, a vertical direction indicates normalization of an aperture, 0 indicates a maximum pupil radius on an optical axis, a vertical axis direction vertex indicates a maximum pupil radius, a dominant wavelength is 546nm, and a horizontal direction indicates an offset amount relative to the dominant wavelength in millimeters (mm), as shown in fig. 15. As can be seen from FIG. 15, the axial aberrations of the normalized apertures of different wavelengths (particularly 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a reasonable range, which indicates that the vertical chromatic aberration of the zoom lens at the middle focal end is better controlled.

Fig. 16 is a field curvature distortion chart of the zoom lens shown in fig. 3 at the telephoto end, wherein, in a left coordinate system of the chart, a horizontal coordinate represents the magnitude of the field curvature in mm, a vertical coordinate represents the normalized image height in no unit, wherein T represents meridian and S represents arc loss, as can be seen from fig. 16, the zoom lens provided in this embodiment is effectively controlled on the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small during imaging, in a right coordinate system, a horizontal coordinate represents the magnitude of distortion in unit of; a vertical coordinate represents the normalized image height in no unit, and as can be seen from fig. 16, the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

Fig. 17 to 19 are ray fan diagrams of the zoom lens shown in fig. 3 at the telephoto end, and as shown in fig. 17 to 19, the abscissa indicates the beam diameter and the ordinate indicates the chromatic aberration. The most ideal curve is a straight line which coincides with the abscissa, which means that all the light rays are converged at the same point on the image plane, and the corresponding interval on the ordinate of the curve is the maximum dispersion range of the light beam on the ideal plane. The light fan graph can reflect monochromatic aberration with different wavelengths and can also show the magnitude of vertical axis chromatic aberration. As can be seen from fig. 17 to 19, the zoom lens has better wavelengths (specifically 436nm, 486nm, 546nm, 588nm, and 656 nm) close to the abscissa under each view field, which indicates that the chromatic aberration of each wavelength of the system is better corrected, and meanwhile, each wavelength is not obviously dispersed, which indicates that the chromatic aberration of the system is better corrected, so that the zoom lens can realize the high-resolution imaging requirement.

Fig. 20 is a vertical chromatic aberration diagram of the zoom lens shown in fig. 3 at the telephoto end, in which, in a vertical chromatic aberration curve, the vertical direction indicates normalization of the field of view, 0 indicates on the optical axis, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset relative to the dominant wavelength in micrometers (um). As can be seen from fig. 20, the chromatic aberration of the vertical axis of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a good range, which indicates that the chromatic aberration of the vertical axis of the zoom lens at the wide-angle end is better controlled, and the wide-spectrum application requirement can be met.

Fig. 21 is an axial aberration diagram of the zoom lens shown in fig. 3 at the telephoto end, wherein in an axial aberration curve, a vertical direction indicates normalization of an aperture, 0 indicates a maximum pupil radius on an optical axis, a vertical axis direction vertex indicates a maximum pupil radius, a dominant wavelength is 546nm, and a horizontal direction indicates an offset amount relative to the dominant wavelength in millimeters (mm), as shown in fig. 21. As can be seen from FIG. 21, the axial aberrations of the normalized apertures of different wavelengths (particularly 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a reasonable range, which indicates that the vertical chromatic aberration of the zoom lens at the telephoto end is better controlled.

In another exemplary embodiment, table 6 details parameters of each lens group in the zoom lens provided in the embodiment of the present invention, and the zoom lens in table 6 corresponds to the zoom lens shown in fig. 22 to 24.

TABLE 6 design of another parameter for each lens group in zoom lens

Table 7 details specific optical physical parameters of each lens in the zoom lens according to the embodiment of the present invention, and table 7 corresponds to the zoom lens shown in table 6.

TABLE 7 design values of another optical physical parameter for each lens in zoom lens

As shown in fig. 22 to 24, the zoom lens provided in the present embodiment is composed of fifteen lenses having optical power and other structures having no optical power, that is, the zoom lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a diaphragm 60, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15, and a plate glass L16, which are sequentially arranged along the optical axis from the object side to the image side, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a first variable power lens group 10, the sixth lens L6, the seventh lens L7, and the eighth lens L5 constitute a first variable power lens group 20, the ninth lens L9, the tenth lens L10, the eleventh lens L11, and the eleventh lens L12 constitute a second variable power lens L14, and the thirteenth lens L15 constitute a first fixed lens group 10, the thirteenth lens L1, the thirteenth lens L2, the thirteenth lens L10 and the thirteenth lens L12 constitute a fifteenth lens L14, and the fifteenth lens L10 constitute a cemented lens L10.

Table 8 shows, in another possible embodiment, different zoom intervals at the wide-angle end, the mid-focal end, and the telephoto end of the zoom lens, respectively, table 8 corresponding to the zoom lens shown in table 6.

Table 8 another zoom interval design value of zoom lens

Table 9 details the aspherical coefficients of each lens in the zoom lens of this example, as another possible implementation, by way of example.

Table 9 design value of another aspherical coefficient for each lens in zoom lens

Wherein, -5.051577E-04 denotes that the coefficient A of the face number 13 is-5.051577 ×10 ^-4, and so on.

Based on the above parameter design, the technical indexes of the zoom lens provided in this embodiment are shown in table 10.

Table 10 technical index of another zoom lens

In this embodiment, fig. 25 is a field curvature distortion chart of the zoom lens shown in fig. 22 at the wide-angle end, wherein in a left coordinate system of the chart, a horizontal coordinate represents a field curvature in mm, a vertical coordinate represents a normalized image height in mm, T represents meridian and S represents arc loss, as can be seen from fig. 25, the zoom lens provided in this embodiment is effectively controlled on the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small during imaging, in a right coordinate system, a horizontal coordinate represents a distortion in mm, a vertical coordinate represents a normalized image height in mm, and no unit, as can be seen from fig. 25, the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

Fig. 26 to 28 are ray fan diagrams of the zoom lens shown in fig. 22 at the wide-angle end, and as shown in fig. 26 to 28, the abscissa indicates the beam diameter and the ordinate indicates the chromatic aberration. The most ideal curve is a straight line which coincides with the abscissa, which means that all the light rays are converged at the same point on the image plane, and the corresponding interval on the ordinate of the curve is the maximum dispersion range of the light beam on the ideal plane. The light fan graph can reflect monochromatic aberration with different wavelengths and can also show the magnitude of vertical axis chromatic aberration. As can be seen from fig. 26 to 28, the zoom lens has better wavelengths (specifically 436nm, 486nm, 546nm, 588nm, and 656 nm) close to the abscissa under each view field, which indicates that the chromatic aberration of each wavelength of the system is better corrected, and meanwhile, each wavelength is not obviously dispersed, which indicates that the chromatic aberration of the system is better corrected, so that the zoom lens can realize the high-resolution imaging requirement.

Fig. 29 is a vertical chromatic aberration diagram of the zoom lens shown in fig. 22 at the wide-angle end, in which, in the vertical chromatic aberration curve, the normalization of the field of view is shown in fig. 29, 0 is shown on the optical axis, 546nm is used as the dominant wavelength, and the offset from the dominant wavelength is shown in microns (um) in the horizontal direction. As can be seen from fig. 29, the chromatic aberration of the vertical axis of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3 nm) are controlled within a good range, which means that the chromatic aberration of the vertical axis of the zoom lens at the wide-angle end is better controlled, and the wide-spectrum application requirement can be satisfied.

Fig. 30 is an axial aberration diagram of the zoom lens shown in fig. 22 at the wide-angle end, in which, as shown in fig. 30, the vertical direction indicates normalization of aperture, 0 indicates that the vertical direction vertex indicates the maximum pupil radius on the optical axis, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset amount relative to the dominant wavelength in millimeters (mm). As can be seen from fig. 30, axial aberrations of normalized apertures of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3 nm) are controlled within a reasonable range, which indicates that the chromatic aberration of the zoom lens at the wide-angle end is better controlled.

Fig. 31 is a graph of distortion of field curvature at the middle focal end of the zoom lens shown in fig. 23, wherein, in a left coordinate system of the graph, horizontal coordinates represent the magnitude of field curvature in mm, vertical coordinates represent normalized image height in no unit, wherein T represents meridian and S represents arc loss, as can be seen from fig. 31, the zoom lens provided in this embodiment is effectively controlled on field curvature, that is, the difference between the image quality at the center and the image quality at the periphery is small during imaging, in a right coordinate system, horizontal coordinates represent the magnitude of distortion in unit of; vertical coordinates represent normalized image height in no unit, and as can be seen from fig. 31, distortion of the zoom lens provided in this embodiment is well corrected and imaging distortion is small.

Fig. 32 to 34 are ray fan diagrams of the zoom lens shown in fig. 23 at the mid-focal end, and as shown in fig. 32 to 34, the abscissa indicates the beam diameter and the ordinate indicates the chromatic aberration. The most ideal curve is a straight line which coincides with the abscissa, which means that all the light rays are converged at the same point on the image plane, and the corresponding interval on the ordinate of the curve is the maximum dispersion range of the light beam on the ideal plane. The light fan graph can reflect monochromatic aberration with different wavelengths and can also show the magnitude of vertical axis chromatic aberration. As can be seen from fig. 32 to fig. 34, the zoom lens has better wavelengths (specifically 436nm, 486nm, 546nm, 588nm, and 656 nm) close to the abscissa under each view field, which indicates that the chromatic aberration of each wavelength of the system is better corrected, and meanwhile, each wavelength has no obvious dispersion, which indicates that the chromatic aberration of the system is better corrected, thereby ensuring that the zoom lens can realize high-resolution imaging requirements.

Fig. 35 is a vertical chromatic aberration diagram of the zoom lens shown in fig. 23 at the mid-focal end, wherein in the vertical chromatic aberration curve, the vertical direction indicates normalization of the field of view, 0 indicates on the optical axis, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset relative to the dominant wavelength in micrometers (um). As can be seen from fig. 35, the chromatic aberration of the vertical axis of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a good range, which indicates that the chromatic aberration of the vertical axis of the zoom lens at the wide-angle end is better controlled, and the wide-spectrum application requirement can be met.

Fig. 36 is an axial aberration diagram of the zoom lens shown in fig. 23 at the mid-focal end, wherein in an axial aberration curve, a vertical direction indicates normalization of an aperture, 0 indicates a maximum pupil radius on an optical axis, a vertical axis direction vertex indicates a maximum pupil radius, a dominant wavelength is 546nm, and a horizontal direction indicates an offset amount relative to the dominant wavelength in millimeters (mm), as shown in fig. 36. As can be seen from FIG. 36, the axial aberrations of the normalized apertures of different wavelengths (particularly 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a reasonable range, which indicates that the vertical chromatic aberration of the zoom lens at the middle focal end is better controlled.

Fig. 37 is a graph of distortion of field curvature of the zoom lens shown in fig. 24 at the telephoto end, wherein, in a left coordinate system of the graph, horizontal coordinates represent the magnitude of field curvature in mm, vertical coordinates represent normalized image height in no unit, wherein T represents meridian and S represents arc loss, as can be seen from fig. 37, the zoom lens provided in this embodiment is effectively controlled on field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small during imaging, in a right coordinate system, horizontal coordinates represent the magnitude of distortion in unit of; vertical coordinates represent normalized image height in no unit, and as can be seen from fig. 37, distortion of the zoom lens provided in this embodiment is well corrected and imaging distortion is small.

Fig. 38 to 40 are ray fan diagrams of the zoom lens shown in fig. 24 at the telephoto end, and as shown in fig. 38 to 40, the abscissa indicates the beam diameter and the ordinate indicates the chromatic aberration. The most ideal curve is a straight line which coincides with the abscissa, which means that all the light rays are converged at the same point on the image plane, and the corresponding interval on the ordinate of the curve is the maximum dispersion range of the light beam on the ideal plane. The light fan graph can reflect monochromatic aberration with different wavelengths and can also show the magnitude of vertical axis chromatic aberration. As can be seen from fig. 38 to 40, the zoom lens has better wavelengths (specifically 436nm, 486nm, 546nm, 588nm, and 656 nm) close to the abscissa under each view field, which indicates that the chromatic aberration of each wavelength of the system is better corrected, and meanwhile, each wavelength has no obvious dispersion, which indicates that the chromatic aberration of the system is better corrected, thereby ensuring that the zoom lens can realize high-resolution imaging requirements.

Fig. 41 is a vertical chromatic aberration diagram of the zoom lens shown in fig. 24 at the telephoto end, in which, in a vertical chromatic aberration curve, the vertical direction indicates normalization of the field of view, 0 indicates on the optical axis, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset relative to the dominant wavelength in micrometers (um). As can be seen from fig. 41, the chromatic aberration of the vertical axis of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a good range, which means that the chromatic aberration of the vertical axis of the zoom lens at the wide-angle end is better controlled, and the wide-spectrum application requirement can be met.

Fig. 42 is an axial aberration diagram of the zoom lens shown in fig. 24 at the telephoto end, in which, in an axial aberration curve, the vertical direction indicates normalization of the aperture, 0 indicates the maximum pupil radius on the optical axis, the vertical axis direction vertex indicates the maximum pupil radius, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset amount relative to the dominant wavelength in millimeters (mm), as shown in fig. 42. From fig. 42, it can be seen that axial aberrations of normalized apertures of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a reasonable range, which indicates that the chromatic aberration of the zoom lens at the focal length end is better controlled.

In yet another exemplary embodiment, table 11 details parameters of each lens group in the zoom lens provided in the embodiment of the present invention, and the zoom lens in table 11 corresponds to the zoom lens shown in fig. 43 to 45.

TABLE 11 yet another parametric design for lens groups in a zoom lens

Table 12 details, in a further possible manner, specific optical physical parameters of each lens in the zoom lens provided in the embodiment of the present invention, table 12 corresponds to the zoom lens shown in table 11.

Table 12 design values of further optical physical parameters of each lens in zoom lens

As shown in fig. 43 to 45, the zoom lens provided in the present embodiment is composed of fifteen lenses having optical power and other structures having no optical power, that is, the zoom lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a diaphragm 60, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15, and a plate glass L16, which are sequentially arranged along the optical axis from the object side to the image side, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a first variable power lens group 10, the sixth lens L6, the seventh lens L7, and the eighth lens L5 constitute a first variable power lens group 20, the ninth lens L9, the tenth lens L10, the eleventh lens L11, and the eleventh lens L12 constitute a second variable power lens L14, and the thirteenth lens L10 constitute a first variable power lens L10, and the thirteenth lens L10 constitute a thirteenth lens L14, and the thirteenth lens L10 and the fifteenth lens L5 constitute a fixed lens L10.

Table 13 shows, in yet another possible embodiment, different zoom intervals at the wide-angle end, the mid-focal end, and the telephoto end of the zoom lens, respectively, table 13 corresponding to the zoom lens shown in table 11.

TABLE 13 yet another zoom interval design value for zoom lens

Illustratively, table 14 details the aspherical coefficients of each lens in the zoom lens of the present embodiment in still another possible implementation.

Table 14 design value of still another aspherical coefficient for each lens in zoom lens

Wherein-5.014924E-04 denotes that the coefficient A of the face number 13 is-5.014924 ×10 ^-4, and so on.

Based on the above parameter design, the technical indexes of the zoom lens provided in the present embodiment are shown in table 15.

Table 15 yet another technical index of zoom lens

In this embodiment, fig. 46 is a field curvature distortion chart of the zoom lens shown in fig. 43 at the wide-angle end, wherein in a left coordinate system of the chart, a horizontal coordinate represents a field curvature in mm, a vertical coordinate represents a normalized image height in no unit, wherein T represents meridian and S represents arc loss, as can be seen from fig. 46, the zoom lens provided in this embodiment is effectively controlled on the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small during imaging, in a right coordinate system, a horizontal coordinate represents a distortion in mm, a vertical coordinate represents a normalized image height in no unit, and as can be seen from fig. 46, the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

Fig. 47 to 49 are ray fan diagrams of the zoom lens shown in fig. 43 at the wide-angle end, and as shown in fig. 47 to 49, the abscissa indicates the beam diameter and the ordinate indicates the chromatic aberration. The most ideal curve is a straight line which coincides with the abscissa, which means that all the light rays are converged at the same point on the image plane, and the corresponding interval on the ordinate of the curve is the maximum dispersion range of the light beam on the ideal plane. The light fan graph can reflect monochromatic aberration with different wavelengths and can also show the magnitude of vertical axis chromatic aberration. As can be seen from fig. 47 to 49, the zoom lens has better wavelengths (specifically 436nm, 486nm, 546nm, 588nm, and 656 nm) close to the abscissa under each view field, which indicates that the chromatic aberration of each wavelength of the system is better corrected, and meanwhile, each wavelength is not obviously dispersed, which indicates that the chromatic aberration of the system is better corrected, so that the zoom lens can realize the high-resolution imaging requirement.

Fig. 50 is a vertical chromatic aberration diagram of the zoom lens shown in fig. 43 at the wide-angle end, in which, in a vertical chromatic aberration curve, the normalization of the field of view is shown in fig. 50, 0 is shown on the optical axis, 546nm is used as the dominant wavelength, and the offset from the dominant wavelength is shown in microns (um) in the horizontal direction. As can be seen from fig. 50, the chromatic aberration of the vertical axis of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a good range, which indicates that the chromatic aberration of the vertical axis of the zoom lens at the wide-angle end is better controlled, and the wide-spectrum application requirement can be met.

Fig. 51 is an axial aberration diagram at the wide-angle end of the zoom lens shown in fig. 43, in which, in an axial aberration curve, the vertical direction indicates normalization of aperture, 0 indicates the maximum pupil radius on the optical axis, the vertical axis direction vertex indicates the maximum pupil radius, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset amount relative to the dominant wavelength in millimeters (mm), as shown in fig. 51. As can be seen from fig. 51, axial aberrations of normalized apertures of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3 nm) are all controlled within a reasonable range, which indicates that the chromatic aberration of the zoom lens at the wide-angle end is better controlled.

Fig. 52 is a graph of distortion of field curvature of the zoom lens shown in fig. 44 at the middle focal end, wherein, in a left coordinate system shown in fig. 52, horizontal coordinates represent the magnitude of field curvature in mm, vertical coordinates represent normalized image height in no unit, wherein T represents meridian and S represents arc loss, as can be seen from fig. 52, the zoom lens provided in this embodiment is effectively controlled on field curvature, i.e., the difference between the image quality of the center and the image quality of the periphery is small during imaging, in a right coordinate system, horizontal coordinates represent the magnitude of distortion in units of; vertical coordinates represent normalized image height in no unit, and as can be seen from fig. 52, distortion of the zoom lens provided in this embodiment is well corrected and imaging distortion is small.

Fig. 53 to 55 are light ray fan diagrams of the zoom lens shown in fig. 44 at the mid-focal end, and as shown in fig. 53 to 55, the abscissa indicates the beam diameter and the ordinate indicates the chromatic aberration. The most ideal curve is a straight line which coincides with the abscissa, which means that all the light rays are converged at the same point on the image plane, and the corresponding interval on the ordinate of the curve is the maximum dispersion range of the light beam on the ideal plane. The light fan graph can reflect monochromatic aberration with different wavelengths and can also show the magnitude of vertical axis chromatic aberration. As can be seen from fig. 53 to 55, the zoom lens has better wavelengths (specifically 436nm, 486nm, 546nm, 588nm, and 656 nm) close to the abscissa under each view field, which indicates that the chromatic aberration of each wavelength of the system is better corrected, and meanwhile, each wavelength has no obvious dispersion, which indicates that the chromatic aberration of the system is better corrected, thereby ensuring that the zoom lens can realize high-resolution imaging requirements.

Fig. 56 is a vertical chromatic aberration diagram of the zoom lens shown in fig. 44 at the mid-focal end, wherein in the vertical chromatic aberration diagram, the vertical direction indicates normalization of the field of view, 0 indicates on the optical axis, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset relative to the dominant wavelength in micrometers (um), as shown in fig. 56. As can be seen from fig. 56, the chromatic aberration of the vertical axis of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a good range, which indicates that the chromatic aberration of the vertical axis of the zoom lens at the wide-angle end is better controlled, and the wide-spectrum application requirement can be met.

Fig. 57 is an axial aberration diagram of the zoom lens shown in fig. 44 at the mid-focal end, in which, as shown in fig. 57, the vertical direction indicates normalization of the aperture, 0 indicates on the optical axis, the vertical direction vertex indicates the maximum pupil radius, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset relative to the dominant wavelength in millimeters (mm). As can be seen from FIG. 57, the axial aberrations of the normalized apertures of different wavelengths (particularly 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a reasonable range, which indicates that the vertical chromatic aberration of the zoom lens at the middle focal end is better controlled.

Fig. 58 is a graph of distortion of field curvature of the zoom lens shown in fig. 45 at the telephoto end, wherein, in a left coordinate system of the graph, horizontal coordinates represent the magnitude of the field curvature in mm, vertical coordinates represent normalized image height in no unit, wherein T represents meridian and S represents arc loss, as can be seen from fig. 58, the zoom lens provided in this embodiment is effectively controlled on the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small during imaging, in a right coordinate system, horizontal coordinates represent the magnitude of distortion in unit of; vertical coordinates represent normalized image height in no unit, and as can be seen from fig. 58, distortion of the zoom lens provided in this embodiment is well corrected and imaging distortion is small.

Fig. 59 to 61 are light ray fan diagrams of the zoom lens shown in fig. 45 at the telephoto end, and as shown in fig. 59 to 61, the abscissa indicates the beam diameter and the ordinate indicates the chromatic aberration. The most ideal curve is a straight line which coincides with the abscissa, which means that all the light rays are converged at the same point on the image plane, and the corresponding interval on the ordinate of the curve is the maximum dispersion range of the light beam on the ideal plane. The light fan graph can reflect monochromatic aberration with different wavelengths and can also show the magnitude of vertical axis chromatic aberration. As can be seen from fig. 59 to 61, the zoom lens has better wavelengths (specifically 436nm, 486nm, 546nm, 588nm, and 656 nm) close to the abscissa under each view field, which indicates that the chromatic aberration of each wavelength of the system is better corrected, and meanwhile, each wavelength is not obviously dispersed, which indicates that the chromatic aberration of the system is better corrected, so that the zoom lens can realize the high-resolution imaging requirement.

Fig. 62 is a vertical chromatic aberration diagram of the zoom lens shown in fig. 45 at the telephoto end, in which, in a vertical chromatic aberration curve, the vertical direction indicates normalization of the field of view, 0 indicates on the optical axis, 546nm is used as the dominant wavelength, and the horizontal direction indicates the offset relative to the dominant wavelength in micrometers (um). As can be seen from fig. 62, the chromatic aberration of the vertical axis of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a good range, which indicates that the chromatic aberration of the vertical axis of the zoom lens at the wide-angle end is better controlled, and the wide-spectrum application requirement can be met.

Fig. 63 is an axial aberration diagram of the zoom lens shown in fig. 45 at the telephoto end, wherein in an axial aberration curve, a vertical direction indicates normalization of an aperture, 0 indicates a maximum pupil radius on an optical axis, a vertical axis direction vertex indicates a maximum pupil radius, a dominant wavelength is 546nm, and a horizontal direction indicates an offset amount from the dominant wavelength in millimeters (mm), as shown in fig. 63. From fig. 63, it can be seen that axial aberrations of normalized apertures of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm and 656.3 nm) are controlled within a reasonable range, which indicates that the chromatic aberration of the zoom lens at the focal length end is better controlled.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. A zoom lens is characterized by comprising a first fixed lens group with positive focal power, a first variable lens group with negative focal power, a diaphragm, a second variable lens group with positive focal power, a focusing lens group with positive focal power and a second fixed lens group with negative focal power, which are sequentially arranged along an optical axis from an object side to an image side;

The first fixed lens group consists of a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with positive focal power, which are sequentially arranged along an optical axis from an object side to an image side;

The first variable magnification lens group consists of a sixth lens with negative focal power, a seventh lens with negative focal power and an eighth lens with positive focal power, which are sequentially arranged from the object side to the image side along the optical axis;

The second variable magnification lens group consists of a ninth lens with positive focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power and a twelfth lens with positive focal power, which are sequentially arranged from the object side to the image side along the optical axis;

the focusing lens group consists of a thirteenth lens with positive focal power and a fourteenth lens with negative focal power which are sequentially arranged from the object side to the image side along the optical axis;

The second fixed lens group consists of a fifteenth lens with negative focal power;

0.664≤|FW/DIS1|≤1.927;

440.556≤|FT/DIS2|≤8569.115;

The focal length G1 of the first fixed lens group, the focal length G2 of the first variable magnification lens group, the focal length G3 of the second variable magnification lens group, the focal length G4 of the focus lens group, and the focal length G5 of the second fixed lens group satisfy:

7.952≤G1/FW≤14.532;

-1.407≤G2/FW≤-2.512;

4.019≤G3/FW≤7.625;

2.498≤G4/FW≤4.877;

-8.951≤G5/FW≤-51.307。

2. The zoom lens of claim 1, wherein 29.948 +.ft/fw+. 49.373.

3. The zoom lens according to claim 1, wherein a maximum movable distance D2 of the first variable magnification lens group, a maximum movable distance D3 of the second variable magnification lens group, and a maximum movable distance D4 of the focus lens group satisfy:

4.806≤|D2/D4|≤6.510;

0.799≤|D3/D4|≤3.897。

4. the zoom lens according to claim 1, wherein an optical system total length TTL of the zoom lens, a moving distance D2 of the first variable magnification lens group, and a moving distance D3 of the second variable magnification lens group satisfy:

2.871≤|TTL/D2|≤3.253;

3.711≤|TTL/D3|≤11.410。

5. the zoom lens of claim 1, wherein the first lens and the second lens constitute a cemented lens.

6. The zoom lens according to claim 5, wherein a focal length f1 of a cemented lens composed of the first lens and the second lens satisfies:

369.802≤|f1/FW|≤664.378。

7. The zoom lens according to claim 5, wherein a focal length f1 of a cemented lens composed of the first lens and the second lens satisfies:

11.930≤|f1/FT|≤12.674。

8. the zoom lens according to claim 5, wherein a focal length f1 of a cemented lens composed of the first lens and the second lens satisfies:

62.583≤|f1/(FT/FW)|≤113.731。

9. the zoom lens of claim 1, wherein the lens is formed of a lens material having a refractive index,

The object side surface of the first lens is a convex surface;

10. The zoom lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all glass spherical lenses.

11. The zoom lens according to claim 1, wherein the seventh lens is a glass aspherical lens, and the sixth lens and the eighth lens are both glass spherical lenses.

12. The zoom lens of claim 1, wherein the lens is formed of a lens material having a refractive index,

The object side surface of the sixth lens is a convex surface, and the image side surface is a concave surface;

13. The zoom lens according to claim 1, wherein the refractive index Nd7 and abbe number Vd7 of the seventh lens satisfy:

1.45≤Nd7≤1.55;

40.00≤Vd7≤95.00。

14. The zoom lens according to claim 1, wherein the tenth lens and the eleventh lens constitute a cemented lens.

15. The zoom lens according to claim 1, wherein the twelfth lens is a glass aspherical lens, and wherein the ninth lens, the tenth lens, and the eleventh lens are each glass spherical lenses.

16. The zoom lens of claim 1, wherein the lens is formed of a lens material having a refractive index,

The object side surface of the ninth lens is a convex surface, and the image side surface is a convex surface;

The object side surface of the tenth lens is a convex surface;

17. The zoom lens according to claim 1, wherein the refractive index Nd12 and abbe number Vd12 of the twelfth lens satisfy:

1.45≤Nd12≤1.55;

40.00≤Vd12≤95.00。

18. the zoom lens according to claim 1, wherein the thirteenth lens is a glass aspherical lens, and the fourteenth lens is a glass spherical lens.

19. The zoom lens of claim 1, wherein the lens is formed of a lens material having a refractive index,

The object side surface of the thirteenth lens is a convex surface, and the image side surface is a convex surface;

20. The zoom lens according to claim 1, wherein the refractive index Nd13 and abbe number Vd13 of the thirteenth lens satisfy:

1.45≤Nd13≤1.55;

40.00≤Vd13≤95.00。

21. The zoom lens of claim 1, wherein the fifteenth lens is a glass aspheric lens.

22. The zoom lens of claim 1, wherein the fifteenth lens element has a concave image side and a convex object side.

23. The zoom lens according to claim 1, wherein the refractive index Nd15 and abbe number Vd15 of the fifteenth lens satisfy:

1.45≤Nd15≤1.75;

20.00≤Vd15≤55.00。