CN216351504U

CN216351504U - Zoom lens

Info

Publication number: CN216351504U
Application number: CN202123070182.4U
Authority: CN
Inventors: 胡可欣; 梁伟朝; 陈礼光; 范家永
Original assignee: Sunny Optics Zhongshan Co Ltd
Current assignee: Sunny Optics Zhongshan Co Ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-04-19
Anticipated expiration: 2031-12-08

Abstract

The utility model relates to a zoom lens, which sequentially comprises the following components in the direction from an object side to an image side along an optical axis: a first lens group (G1) having positive optical power, a second lens group (G2) having negative optical power, a stop (stop), a third lens group (G3) having positive optical power, and a fourth lens group (G4) having positive optical power, the second lens group (G2) and the fourth lens group (G4) being moved along an optical axis, a distance d2 from a last face of the first lens group (G1) to a first face of the second lens group (G2) in the telephoto end of the zoom lens_12tA distance d from a last surface of the first lens group (G1) to a first surface of the second lens group (G2) at a wide-angle end of the zoom lens_12wAnd the zoomingThe lens satisfies the relation between focal lengths fw at the wide-angle end: d is not more than 0.7_12t‑d_12w) The/fw is less than or equal to 1.2. The zoom lens realizes high imaging performance with wide visual field, small volume, low cost and resolution ratio of more than 4 k.

Description

Zoom lens

Technical Field

The utility model relates to the technical field of imaging optical systems, in particular to a zoom lens.

Background

The development of the AI face recognition technology puts higher requirements on the aperture, the image plane, the resolution, the infrared performance and the high and low temperature performance of the camera lens.

The existing lens generally has the following defects: the aperture is small, and the requirement of an image on brightness in a low-illumination environment cannot be met; the large image plane and the small volume can not be considered at the same time, and the space requirement of the lens can not be met; the resolution ratio is low, the resolution ratio of a mainstream 1080P lens is 200 ten thousand, and the requirement of face recognition on high pixels cannot be met; the infrared performance and the high and low temperature performance cannot be considered at the same time, and the requirement of day and night confocal performance is often met by sacrificing the high and low temperature performance, but the requirement of face identification on real-time performance in a high and low temperature environment cannot be met.

The zoom lens disclosed in chinese patent CN102087404B mainly solves the problem of increasing the light-entering amount and the zoom ratio, and achieving the compact size requirement, but cannot give consideration to the above multiple performances.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the present invention provides a zoom lens, which has a wide field of view, a small volume, a low cost, and a high imaging performance with a resolution of more than 4 k.

To achieve the above object, the present invention provides a zoom lens, comprising, in order from an object side to an image side along an optical axis: a first lens group having positive optical power, a second lens group having negative optical power, a diaphragm, a third lens group having positive optical power, and a fourth lens group having positive optical power, the second and fourth lens groups moving along an optical axis, a last face of the first lens group at a telephoto end of the zoom lens to the second lens groupOf the first face d_12tA distance d from the last surface of the first lens group to the first surface of the second lens group at the wide-angle end of the zoom lens_12wAnd the focal length fw of the zoom lens at the wide-angle end satisfies the following relation: d is not more than 0.7_12t-d_12w)/fw≤1.2。

According to one aspect of the present invention, the first lens group comprises at least two lenses with positive focal power and one lens with negative focal power;

the image side surface of the lens, closest to the image surface, of the first lens group is a concave surface;

the lens of the first lens group closest to the object plane has negative focal power, the object side surface of the lens of the first lens group closest to the object plane is a convex surface, and the image side surface of the lens of the first lens group closest to the object plane is a concave surface.

According to one aspect of the present invention, a distance TTL from the first surface to the image plane of the first lens group and an imaging target surface diameter Φ of the zoom lens satisfy a relation: TTL/phi is more than or equal to 4 and less than or equal to 7.5.

According to one aspect of the present invention, the second lens group comprises at least one lens with positive focal power, two lenses with negative focal power and two plastic lenses;

the object side surface of the lens, closest to the image surface, of the second lens group is a convex surface.

According to one aspect of the utility model, the lens of the second lens group closest to the image plane is a plastic lens.

According to an aspect of the present invention, the second lens group at least includes 1 plastic lens with abbe number satisfying the following relation: VD₂₁≥50；

The second lens group at least comprises 1 plastic lens with Abbe number satisfying the following relational expression: VD₂₂≤30。

According to one aspect of the utility model, the third lens group comprises at least five lenses;

the third lens group at least comprises two lenses with negative focal power, two lenses with positive focal power, two plastic lenses and a cemented lens;

the lens of the third lens group closest to the image plane has negative focal power, and the image side surface of the lens of the third lens group closest to the image plane is a concave surface.

According to an aspect of the present invention, the focal length f3 of the third lens group and the focal length fw of the zoom lens at the wide-angle end satisfy the relation: f3/fw is more than or equal to 0.8 and less than or equal to 2.

According to an aspect of the present invention, the third lens group includes 1 or at least 1 low dispersion glass lens, and the abbe number VD and the refractive index ND of the lens satisfy the following relations, respectively:

65≤VD≤100；

1.4≤ND≤1.60。

according to an aspect of the utility model, the fourth lens group at least comprises two lenses with positive focal power, one lens with negative focal power and two plastic lenses;

the lens of the fourth lens group closest to the object plane has positive focal power;

and the lens of the fourth lens group closest to the image surface is a plastic lens.

According to an aspect of the present invention, a distance d from a last face of the first lens group to a first face of the second lens group at a telephoto end of the zoom lens_12tA distance d from the last surface of the first lens group to the first surface of the second lens group at the wide-angle end of the zoom lens_12wAnd the distance TTL from the first surface of the first lens group to the image surface satisfies the relational expression: TTL/(d) of 3 ≤_12t-d_12w)≤6。

According to an aspect of the present invention, a distance d from a last face of the first lens group to a first face of the second lens group at a telephoto end of the zoom lens_12tA distance d from the last surface of the first lens group to the first surface of the second lens group at the wide-angle end of the zoom lens_12wAnd the focal length fw of the zoom lens at the wide angle end and the focal length ft of the zoom lens at the telephoto end satisfy the relation: less than or equal to 3 (d)_12t-d_12w)/(ft/fw)≤6.5。

According to the scheme of the utility model, the zoom lens adopts the variable diaphragm and the optical structure of the four-group framework of the specific focal power combination, so that the aperture of the zoom lens can reach F1.4, the brightness of an image can be ensured in a low-illumination environment, and the imaging performance of wide visual field, small volume, low cost and resolution ratio of more than 4k is considered. And adopt glass and plastic mixed lens structure, the glass lens of reasonable distribution anomalous dispersion and high refractive index reach high-quality imaging effect, have good resolving power, realize small, reduce the design cost while guaranteeing great magnification. And, the maximization of imaging performance is achieved in a volume as small as possible.

The zoom lens also realizes the correction of chromatic aberration and secondary spectrum of 420-940nm wave band, and can ensure resolving power without refocusing when switching day and night. On the premise of considering infrared performance, the problem of focus drift in high and low temperature environments is solved, the zoom lens is free of virtual focus in the temperature range of-40-80 ℃, the zoom lens is suitable for various high and low temperature environments, and the application range of the zoom lens is greatly expanded.

The zoom lens has low distortion in the whole zooming process, ensures that the deformation of a shot picture is less, can realize wide range of focusing object distance, can ensure that the object distance can be clearly focused from 0.1m to infinity in the whole zooming process, and has good imaging effect. In addition, the zoom lens has better single-component and assembly tolerance and good manufacturability.

Drawings

Fig. 1 is a lens configuration view schematically showing a wide angle end (W) when an object distance is infinity in a zoom lens system according to embodiment 1 of the present invention;

fig. 2 is a lens configuration view schematically showing a long focal length end (T) when an object distance is infinity in the zoom lens system according to embodiment 1 of the present invention;

fig. 3 is a magnification chromatic aberration diagram schematically illustrating a wide-angle end (W) when an object distance is infinity in the zoom lens system according to embodiment 1 of the present invention;

fig. 4 is a schematic view showing chromatic aberration of position at the wide-angle end (W) when the object distance is infinity in the zoom lens system according to embodiment 1 of the present invention;

fig. 5 schematically shows a distortion diagram at the wide angle end (W) when the object distance is infinity in the zoom lens system according to embodiment 1 of the present invention;

FIG. 6 is a magnification chromatic aberration diagram schematically showing a long focal end (T) when an object distance is infinity in the zoom lens system according to embodiment 1 of the present invention;

FIG. 7 is a view schematically showing positional chromatic aberration at the focal end (T) when the object distance is infinity in the zoom lens system according to embodiment 1 of the present invention;

FIG. 8 is a view schematically showing the distortion at the telephoto end (T) when the object distance is infinity in the zoom lens system according to embodiment 1 of the present invention;

fig. 9 is a lens configuration view schematically showing a wide angle end (W) when an object distance is infinity in the zoom lens system according to embodiment 2 of the present invention;

fig. 10 is a lens structure view schematically showing a long focal length end (T) when the object distance is infinity in the zoom lens system according to embodiment 2 of the present invention;

fig. 11 is a magnification chromatic aberration diagram schematically illustrating a wide-angle end (W) when an object distance is infinity in the zoom lens system according to embodiment 2 of the present invention;

fig. 12 is a schematic view showing chromatic aberration of position at the wide-angle end (W) when the object distance is infinity in the zoom lens system according to embodiment 2 of the present invention;

fig. 13 schematically shows a distortion diagram at the wide angle end (W) when the object distance is infinity in the zoom lens system according to embodiment 2 of the present invention;

FIG. 14 is a magnification chromatic aberration diagram schematically showing a long focal end (T) when an object distance is infinity in the zoom lens system according to embodiment 2 of the present invention;

FIG. 15 is a view schematically showing positional chromatic aberration at the focal end (T) when the object distance is infinity in the zoom lens system according to embodiment 2 of the present invention;

FIG. 16 is a view schematically showing a distortion diagram of a long focal end (T) when the object distance is infinity in the zoom lens system according to embodiment 2 of the present invention;

fig. 17 is a lens configuration view schematically showing a wide angle end (W) when an object distance is infinity in the zoom lens according to embodiment 3 of the present invention;

fig. 18 is a lens structure view schematically showing a long focal length end (T) when the object distance is infinity in the zoom lens system according to embodiment 3 of the present invention;

fig. 19 is a magnification chromatic aberration diagram schematically illustrating a wide-angle end (W) when an object distance is infinity in the zoom lens according to embodiment 3 of the present invention;

fig. 20 is a schematic view showing chromatic aberration of position at the wide-angle end (W) when the object distance is infinity in the zoom lens according to embodiment 3 of the present invention;

fig. 21 schematically shows a distortion diagram at the wide angle end (W) when the object distance is infinity in the zoom lens system according to embodiment 3 of the present invention;

FIG. 22 is a magnification chromatic aberration diagram schematically showing a long focal end (T) when an object distance is infinity in the zoom lens system according to embodiment 3 of the present invention;

FIG. 23 is a view schematically showing positional chromatic aberration at the long focal end (T) when the object distance is infinity in the zoom lens system according to embodiment 3 of the present invention;

FIG. 24 is a view schematically showing a distortion diagram of the long focal end (T) when the object distance is infinity in the zoom lens system according to embodiment 3 of the present invention;

fig. 25 is a lens configuration view schematically showing a wide angle end (W) when an object distance is infinity in the zoom lens according to embodiment 4 of the present invention;

FIG. 26 is a lens structure view schematically showing a long focal length end (T) at an infinite object distance in the zoom lens system according to embodiment 4 of the present invention;

fig. 27 is a magnification chromatic aberration diagram schematically illustrating a wide-angle end (W) when an object distance is infinity in the zoom lens according to embodiment 4 of the present invention;

fig. 28 is a schematic view showing chromatic aberration of position at the wide angle end (W) when the object distance is infinity in the zoom lens according to embodiment 4 of the present invention;

fig. 29 schematically shows a distortion diagram at the wide angle end (W) when the object distance is infinity in the zoom lens system according to embodiment 4 of the present invention;

FIG. 30 is a magnification chromatic aberration diagram schematically showing the long focal end (T) when the object distance is infinity in the zoom lens system according to embodiment 4 of the present invention;

FIG. 31 is a view schematically showing positional chromatic aberration at the long focal end (T) when the object distance is infinity for the zoom lens system according to embodiment 4 of the present invention;

FIG. 32 is a view schematically showing a distortion diagram of the long focal end (T) when the object distance is infinity in the zoom lens system according to embodiment 4 of the present invention;

fig. 33 is a lens structural view schematically showing a wide angle end (W) when an object distance is infinity in the zoom lens according to embodiment 5 of the present invention;

FIG. 34 is a lens structure view schematically showing a long focal length end (T) at an infinite object distance of the zoom lens system according to embodiment 5 of the present invention;

fig. 35 is a magnification chromatic aberration diagram schematically illustrating a wide-angle end (W) when an object distance is infinity in the zoom lens according to embodiment 5 of the present invention;

fig. 36 is a schematic view showing chromatic aberration of position at the wide-angle end (W) when the object distance is infinity in the zoom lens according to embodiment 5 of the present invention;

fig. 37 schematically shows a distortion diagram at the wide angle end (W) when the object distance is infinity in the zoom lens according to embodiment 5 of the present invention;

FIG. 38 is a magnification chromatic aberration diagram schematically showing the long focal end (T) when the object distance is infinity in the zoom lens system according to embodiment 5 of the present invention;

FIG. 39 is a view schematically showing positional chromatic aberration of a long focal end (T) of a zoom lens system according to embodiment 5 of the present invention at an object distance of infinity;

fig. 40 schematically shows a distortion diagram of the long focal end (T) when the object distance is infinity in the zoom lens according to embodiment 5 of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.

The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.

As shown in fig. 1 or fig. 2, the zoom lens of the present invention includes, in order from an object side to an image side along an optical axis: the optical lens comprises a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a diaphragm stop, a third lens group G3 with positive focal power and a fourth lens group G4 with positive focal power, wherein the second lens group G2 and the fourth lens group G4 move along an optical axis, and the third lens group G3 at least comprises five lenses. As illustrated in fig. 1 and 2, by moving the second lens group G2 from the object side to the image side along the optical axis, magnification is changed from the wide angle end to the telephoto end. Meanwhile, by moving the fourth lens group G4 along the optical axis, a variation in the image plane position during magnification variation can be corrected. The zoom lens adopts the design of the variable diaphragm stop and the optical mechanism, the aperture can reach F1.4, the zoom lens can ensure the brightness of an image in a low-illumination environment, and the zoom lens has the imaging performance of wide field of view, small volume, low cost and resolution ratio of more than 4 k.

For the first lens group G1, the group at least includes two lenses with positive refractive power and one lens with negative refractive power. The image side surface of the lens of the first lens group G1 closest to the image plane is concave. The lens of the first lens group G1 closest to the object plane has negative power, and the object-side surface and the image-side surface of the lens of the first lens group G1 closest to the object plane are convex and concave.

The distance TTL from the first surface of the first lens group G1 to the image surface and the diameter phi of the imaging target surface of the zoom lens satisfy the relation: TTL/phi is more than or equal to 4 and less than or equal to 7.5. When the value of the above relation is less than 4, the aberration balance at the telephoto end of the zoom lens is limited, and it is difficult to improve the resolving power. When the value of the above relational expression is larger than 7.5, the zoom lens is increased in size, the zoom efficiency is lowered, and the cost is increased. When the relation is satisfied, the zoom lens has the advantages of small volume, high resolving power, low cost and high performance of zooming efficiency.

For the second lens group G2, the group at least includes one lens with positive focal power, two lenses with negative focal power and two plastic lenses. The object side surface of the lens of the second lens group G2 closest to the image plane is a convex surface. The lens of the second lens group G2 closest to the image plane is a plastic lens. The second lens group G2 at least includes 1 plastic lens with Abbe number satisfying the following relation: VD₂₁Not less than 50; the second lens group G2 further includes at least 1 plastic lens with abbe number satisfying the following relation: VD₂₂Less than or equal to 30. When the two relational expressions are satisfied, the field curvature and astigmatism generated by large incident angle light at the wide-angle end can be effectively reduced, the resolving power at the wide-angle end is comprehensively improved, and the key function is realized on solving the problem of focus drift at high and low temperatures of the system.

For the third lens group G3, the group at least includes two lenses with negative focal power, two lenses with positive focal power, two plastic lenses and a cemented lens; the lens of the third lens group G3 closest to the image plane has negative power, and the image side surface of the lens of the third lens group G3 closest to the image plane is concave. Wherein the focal length f3 of the third lens group G3 and the focal length fw of the zoom lens at the wide-angle end satisfy the relation: f3/fw is more than or equal to 0.8 and less than or equal to 2. When the value of the above-described relational expression is less than 0.8, the tolerance sensitivity of the third lens group G3 becomes poor, and the zoom lens resolution uniformity becomes poor. When the value of the above relation is greater than 2, the zoom lens has a large size and a long length, which is not favorable for satisfying the performance of small size. When the relation is satisfied, the zoom lens has the advantages of small volume, high resolution, low cost and high performance.

The third lens group G3 includes 1 or at least 1 low dispersion glass lens, and the abbe number VD and the refractive index ND of the lens satisfy the following relations:

65≤VD≤100；

1.4≤ND≤1.60。

the introduction of the low dispersion glass lens can reasonably balance chromatic aberration generated by the first lens group G1 and the second lens group G2, and comprehensively improve the resolution of the zoom lens in the whole zoom process.

For the fourth lens group G4, the group at least includes two lenses with positive focal power, one lens with negative focal power and two plastic lenses; the lens of the fourth lens group G4 closest to the object plane has positive focal power; the lens of the fourth lens group G4 closest to the image plane is a plastic lens.

Distance d from last face of first lens group G1 to first face of second lens group G2 when zoom lens is at telephoto end_12tA distance d from the last surface of the first lens group G1 to the first surface of the second lens group G2 at the wide-angle end of the zoom lens_12wAnd the focal length fw of the zoom lens at the wide-angle end satisfies the following relation: d is not more than 0.7_12t-d_12w) The/fw is less than or equal to 1.2. When the value of the above relation is less than 0.7, aberration generated between the first lens group G1 and the second lens group G2 increases, so that zoom lens power decreases. When the value of the above relation is larger than 1.2, the volume of the zoom lens increases, so that the design cost increases.

Distance d from last face of first lens group G1 to first face of second lens group G2 when zoom lens is at telephoto end_12tA distance d from the last surface of the first lens group G1 to the first surface of the second lens group G2 at the wide-angle end of the zoom lens_12wThe distance TTL from the first surface of the first lens group G1 to the image surface of the zoom lens satisfies the relation: TTL/(d) of 3 ≤_12t-d_12w) Less than or equal to 6. When the value of the above relational expression is less than 3, the zoom lens has an increased volume, increased design cost, and reduced magnification efficiency. When the value of the above relation is greater than 6, the firstThe aberration generated between the lens group G1 and the second lens group G2 increases, so that the zoom lens power decreases and the group tolerance sensitivity deteriorates.

Distance d from last face of first lens group G1 to first face of second lens group G2 when zoom lens is at telephoto end_12tA distance d from the last surface of the first lens group G1 to the first surface of the second lens group G2 at the wide-angle end of the zoom lens_12wAnd the focal length fw of the zoom lens at the wide angle end and the focal length ft of the zoom lens at the telephoto end satisfy the relation: less than or equal to 3 (d)_12t-d_12w) /(ft/fw) ≦ 6.5. When the value of the above relational expression is less than 3, the resolution of the zoom lens is reduced at both the telephoto end and the wide-angle end, and the tolerance sensitivity is deteriorated. When the value of the above relational expression is larger than 6.5, the zoom lens has an increased volume, increased design cost, and reduced magnification efficiency.

The zoom lens of the present invention is specifically described below in five embodiments. In each of the following examples, the stop, the Image plane IMA, and the cemented surface of the cemented lens are described as one surface stop, one surface Image, and one surface Image, respectively.

The parameters of each example specifically corresponding to the above relationship are shown in table 1 below:

conditional formula (II)	Example 1	Example 2	Example 3	Example 4	Example 5
						0.7≤(d_12t-d_12w)/fw≤1.2	0.74	1.17	0.99	0.81	0.83
3≤TTL/(d_12t-d_12w)≤6	5.03	4.32	3.91	6.00	4.43
						3≤(d_12t-d_12w)/(ft/fw)≤6.5	6.01	6.01	5.63	3.53	5.79
4≤TTL/φ≤7.5	5.51	6.13	5.48	6.90	7.03
						0.8≤f3/fw≤2	0.92	1.18	1.06	1.13	1.76

TABLE 1

Example 1

Referring to fig. 1 and 2, in the present embodiment, the zoom lens parameters are as follows:

TTL＝48.53mm；

FNO(WIDE)＝1.60；

the focal length fw at the wide angle end is 13.1 mm;

the tele end focal length ft is 21.0 mm.

Relevant parameters of each lens of the zoom lens of the present embodiment include a surface type, a curvature radius R value, a thickness d, a refractive index ND of a material, and an abbe number VD, and surf1 to surf27 represent each surface of each lens, a cemented lens, and a stop in the zoom lens, as shown in table 2 below.

TABLE 2

In the present embodiment, the aspherical lens of the zoom lens satisfies the following formula:

wherein Z represents the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k represents a conic coefficient; a. the₄、A₆、A₈、A₁₀、A₁₂Respectively representing aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order. The aspherical surface values are shown in Table 3 below.

k

A₄

A₆

A₈

A₁₀

A₁₂

surf8

0

-2.35E-03

3.28E-05

1.87E-07

-9.95E-09

5.21E-11

surf9

-2.0380503

-1.45E-03

2.54E-05

-1.50E-07

6.29E-09

-1.74E-10

surf10

2.2702834

-3.10E-05

-1.18E-07

-6.08E-07

2.43E-08

-3.55E-10

surf11

18.859643

-2.09E-04

7.25E-06

-2.33E-07

6.88E-09

-1.44E-10

surf15

16.087896

-3.67E-04

5.22E-06

3.50E-07

-6.19E-09

-6.31E-11

surf16

-0.60217865

2.18E-04

1.78E-06

3.80E-08

-4.27E-10

-4.45E-11

surf17

-1.4176661

-5.39E-04

2.16E-05

-1.75E-07

-5.23E-08

5.66E-10

surf18

-3.9627671

-6.67E-04

1.75E-05

4.26E-07

-1.28E-07

2.61E-09

surf24

0

2.87E-03

-7.93E-05

-9.99E-07

-9.92E-08

-5.71E-09

surf25

0

1.36E-03

2.00E-04

-4.95E-06

-6.44E-09

-3.08E-08

surf26

0

-3.64E-03

1.39E-04

2.63E-06

-6.90E-09

-5.50E-09

surf27

0

-1.80E-03

-2.49E-05

7.50E-06

-2.90E-07

7.66E-09

TABLE 3

The zoom lens of the present embodiment has magnification data as shown in table 4 below.

Surface number	Wide angle end	Long coke end
			D5	0.72	10.36
D11	14.99	5.36
			D21	2.44	1.62
D27	3.68	4.49

TABLE 4

In the second lens group G2 of the zoom lens of this embodiment, the fifth lens L5 is a plastic lens with an Abbe number VD_L556.00. The sixth lens element L6 is a plastic lens element with an Abbe number VD_L623.50. The third lens group G3 includes two low dispersion glass lenses, i.e., a seventh lens L7 and a tenth lens L10. The refractive index and abbe number of the seventh lens L7 are respectively: ND_L7＝1.50，VD_L781.60; the refractive index and abbe number of the tenth lens L10 are: ND_L10＝1.44，VD_L10＝95.10。

Therefore, with reference to fig. 1 to 8 and the related design parameters and data in tables 1 to 4, by adopting the iris diaphragm and the optical structure of the four-group structure with a specific combination of powers, the aperture of the zoom lens can reach F1.4, the brightness of the image can be ensured in a low-illumination environment, and the imaging performance of wide field of view, small volume, low cost and resolution ratio of more than 4k is considered. And adopt glass and plastic mixed lens structure, the glass lens of reasonable distribution anomalous dispersion and high refractive index reach high-quality imaging effect, have good resolving power, realize small, reduce the design cost while guaranteeing great magnification. And, the maximization of imaging performance is achieved in a volume as small as possible.

Example 2

Referring to fig. 9 and 10, in the present embodiment, the zoom lens parameters are as follows:

TTL＝54.03mm；

FNO(WIDE)＝1.65；

the wide-angle end focal length fw is 10.7 mm;

the tele end focal length ft is 22.3 mm.

Relevant parameters of each lens of the zoom lens of the present embodiment include a surface type, a curvature radius R value, a thickness d, a refractive index ND of a material, and an abbe number VD, and surf1 to surf27 represent each surface of each lens, a cemented lens, and a stop in the zoom lens, as shown in table 5 below.

TABLE 5

wherein Z represents the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k represents a conic coefficient; a. the₄、A₆、A₈、A₁₀、A₁₂Respectively representing aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order. The aspherical surface values are shown in Table 6 below.

TABLE 6

The magnification-varying data of the zoom lens of the present embodiment is shown in table 7 below.

Surface number	Wide angle end	Long coke end
			D5	1.42	13.94
D11	18.56	6.04
			D21	1.79	1.65
D27	5.07	5.21

TABLE 7

In the second lens group G2 of the zoom lens of this embodiment, the fifth lens L5 is a plastic lens with an Abbe number VD_L556.00. The sixth lens element L6 is a plastic lens element with an Abbe number VD_L620.40. The third lens group G3 includes two low dispersion glass lenses, each being an eighth lensL8 and a tenth lens L10. The refractive index and abbe number of the eighth lens L8 are respectively: ND_L8＝1.50，VD_L881.60; the refractive index and abbe number of the tenth lens L10 are: ND_L10＝1.44，VD_L10＝95.10。

Therefore, with reference to fig. 9 to 16, and the related design parameters and data in tables 1 and 5 to 7, by using the iris diaphragm and the optical structure of the four-group structure with a specific power combination, the aperture of the zoom lens can reach F1.4, the brightness of the image can be ensured in a low-illumination environment, and the wide-field, small-volume, low-cost and imaging performance with a resolution of 4k or more are considered. And adopt glass and plastic mixed lens structure, the glass lens of reasonable distribution anomalous dispersion and high refractive index reach high-quality imaging effect, have good resolving power, realize small, reduce the design cost while guaranteeing great magnification. And, the maximization of imaging performance is achieved in a volume as small as possible.

Example 3

Referring to fig. 17 and 18, in the present embodiment, the zoom lens parameters are as follows:

TTL＝48.25mm；

FNO(WIDE)＝1.8；

the focal length fw at the wide angle end is 12.5 mm;

the tele end focal length ft is 27.4 mm.

Relevant parameters of each lens of the zoom lens of the present embodiment include a surface type, a curvature radius R value, a thickness d, a refractive index ND of a material, and an abbe number VD, and surf1 to surf27 represent each surface of each lens, a cemented lens, and a stop in the zoom lens, as shown in table 8 below.

TABLE 8

wherein Z represents the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k represents a conic coefficient; a. the₄、A₆、A₈、A₁₀、A₁₂Respectively representing aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order. The aspherical surface values are shown in Table 9 below.

k

A₄

A₆

A₈

A₁₀

A₁₂

Surf6

0.00

-2.29E-03

4.78E-05

3.58E-07

-3.52E-08

4.46E-10

Surf7

0.00

2.61E-05

1.43E-07

5.05E-08

-2.02E-09

0.00E+00

surf10

2.2702834

-1.01E-04

-3.31E-06

-5.47E-07

4.16E-08

-7.81E-10

surf11

18.859643

-2.19E-04

1.50E-05

-5.90E-07

-7.06E-10

4.01E-10

surf15

-0.60217865

-3.29E-06

1.61E-06

-2.38E-07

8.56E-09

5.16E-11

surf16

16.087896

2.36E-04

-8.61E-06

3.70E-08

7.70E-09

5.04E-11

surf17

-1.4176661

-7.41E-04

2.07E-05

-8.69E-07

-4.54E-08

2.13E-09

surf18

-3.9627671

-2.52E-04

2.95E-06

8.38E-07

-1.37E-07

4.15E-09

surf24

0

-7.64E-04

4.77E-05

-6.09E-06

3.43E-07

-7.62E-09

TABLE 9

The magnification-varying data of the zoom lens of the present embodiment is shown in table 10 below.

Surface number	Wide angle end	Long coke end
			D5	0.94	13.27
D11	12.64	0.31
			D21	2.43	1.55
D27	4.89	5.77

Watch 10

In the second lens group G2 of the zoom lens of this embodiment, the fourth lens L4 is a plastic lens with an Abbe number VD_L456.00. The sixth lens element L6 is a plastic lens element with an Abbe number VD_L620.4. The third lens group G3 includes two low dispersion glass lenses, i.e., a seventh lens L7 and a tenth lens L10. The refractive index and abbe number of the seventh lens L7 are respectively: ND_L7＝1.50，VD_L781.60; the refractive index and abbe number of the tenth lens L10 are: ND_L10＝1.44，VD_L10＝95.10。

Therefore, with reference to fig. 17 to 24 and the related design parameters and data in tables 1 and 8 to 10, by using an optical structure of a four-group structure with an iris diaphragm and a specific power combination, the aperture of the zoom lens can reach F1.4, the brightness of an image can be ensured in a low-illumination environment, and the wide-field, small-volume, low-cost and imaging performance with a resolution of 4k or more are considered. And adopt glass and plastic mixed lens structure, the glass lens of reasonable distribution anomalous dispersion and high refractive index reach high-quality imaging effect, have good resolving power, realize small, reduce the design cost while guaranteeing great magnification. And, the maximization of imaging performance is achieved in a volume as small as possible.

Example 4

Referring to fig. 25 and 26, in the present embodiment, the zoom lens parameters are as follows:

TTL＝46.87mm；

FNO(WIDE)＝1.45；

the focal length fw at the wide angle end is 9.6 mm;

the tele end focal length ft is 21.2 mm.

Relevant parameters of each lens of the zoom lens of the present embodiment include a surface type, a curvature radius R value, a thickness d, a refractive index ND of a material, and an abbe number VD, and surf1 to surf27 represent each surface of each lens, a cemented lens, and a stop in the zoom lens, as shown in table 11 below.

Surface number	Surface type	Radius of curvature R value	Thickness d	Refractive index ND	Abbe number VD
						surf1	standard	24.29	0.90	1.95	18.00
surf2	standard	19.94	2.51	1.50	81.60
						surf3	standard	100.00	0.15
surf4	standard	19.62	2.50	1.50	81.60
						surf5	standard	338.14	D5 is movable
surf6	evenasphere	91.69	1.30	1.54	56.00
						surf7	evenasphere	4.56	1.76
surf8	standard	91.02	1.00	1.74	27.80
						surf9	standard	12.28	0.17
surf10	evenasphere	10.91	2.10	1.66	20.40
						surf11	evenasphere	225.55	D11 is movable
stop	standard	Infinity	0.39
						surf13	standard	9.14	2.81	1.50	81.60
surf14	standard	-61.35	0.20
						surf15	evenasphere	19.48	1.50	1.54	56.00
surf16	evenasphere	-122.29	0.47
						surf17	evenasphere	-29.40	1.01	1.64	23.50
surf18	evenasphere	-65.35	0.18
						surf19	standard	9.37	3.03	1.44	95.10
surf20	standard	-7.91	0.60	1.60	38.00
						surf21	standard	23.06	D21 is movable
surf22	standard	-563.25	2.07	1.95	17.90
						surf23	standard	-13.62	0.58
surf24	evenasphere	-14.12	0.90	1.64	23.50
						surf25	standard	8.00	0.30
surf26	evenasphere	6.90	2.00	1.54	56.00
						surf27	evenasphere	21.63	D27 is movable
Image	standard	Infinity	0.000

Table 11 in the present embodiment, the aspherical lens of the zoom lens satisfies the following formula:

wherein Z represents the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k represents a conic coefficient; a. the₄、A₆、A₈、A₁₀、A₁₂Respectively representing aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order. Aspherical surface has a value ofTable 12 below shows.

k

A₄

A₆

A₈

A₁₀

A₁₂

Surf6

0

-2.12E-03

6.16E-05

1.14E-07

-5.17E-08

9.02E-10

Surf7

0

1.78E-05

-5.95E-07

9.37E-08

-3.96E-09

0.00E+00

surf10

2.2894924

9.67E-05

-1.95E-06

-8.84E-07

2.98E-08

-1.30E-09

surf11

246.0070547

-6.42E-05

1.73E-05

-3.10E-07

-2.24E-08

1.23E-10

surf15

-0.67525854

-2.38E-04

-9.82E-07

-1.18E-07

-9.36E-09

2.59E-10

surf16

3.582310688

-2.00E-04

-1.88E-06

1.47E-07

3.75E-09

-4.24E-10

surf17

-4.163196

3.70E-04

-6.51E-06

-9.13E-07

1.26E-07

-3.13E-09

surf18

1.909525669

6.17E-04

-2.94E-05

6.54E-07

6.47E-08

-2.00E-09

surf24

0

-1.46E-04

2.57E-05

-7.81E-06

7.07E-07

-1.88E-08

surf26

0

-9.78E-04

5.52E-05

-2.77E-06

-4.27E-08

0.00E+00

surf27

0

6.78E-04

9.90E-06

6.05E-07

1.61E-08

0.00E+00

TABLE 12

The magnification-varying data of the zoom lens of the present embodiment is shown in table 13 below.

Surface number	Wide angle end	Long coke end
			D5	0.99	8.80
D11	11.37	3.56
			D21	1.56	1.56
D27	4.52	4.52

Watch 13

In the second lens group G2 of the zoom lens of this embodiment, the fourth lens L4 is a plastic lens with an Abbe number VD_L456.00. The sixth lens element L6 is a plastic lens element with an Abbe number VD_L620.4. The third lens group G3 includes two low dispersion glass lenses, each being a seventh lensL7 and a tenth lens L10. The refractive index and abbe number of the seventh lens L7 are respectively: ND_L7＝1.50，VD_L781.60; the refractive index and abbe number of the tenth lens L10 are: ND_L10＝1.44，VD_L10＝95.10。

Therefore, with reference to fig. 25 to 32 and the related design parameters and data in tables 1 and 11 to 13, by using an optical structure of a four-group structure with an iris diaphragm and a specific power combination, the aperture of the zoom lens can reach F1.4, the brightness of an image can be ensured in a low-illumination environment, and the wide-field, small-volume, low-cost and imaging performance with a resolution of 4k or more are considered. And adopt glass and plastic mixed lens structure, the glass lens of reasonable distribution anomalous dispersion and high refractive index reach high-quality imaging effect, have good resolving power, realize small, reduce the design cost while guaranteeing great magnification. And, the maximization of imaging performance is achieved in a volume as small as possible.

Example 5

Referring to fig. 33 and 34, in the present embodiment, the zoom lens parameters are as follows:

TTL＝48.15mm；

FNO(WIDE)＝1.70；

the focal length fw at the wide angle end is 13.1 mm;

the tele end focal length ft is 24.6 mm.

Relevant parameters of each lens of the zoom lens of the present embodiment include a surface type, a curvature radius R value, a thickness d, a refractive index ND of a material, and an abbe number VD, and surf1 to surf27 represent each surface of each lens, a cemented lens, and a stop in the zoom lens, as shown in table 14 below.

TABLE 14

wherein Z represents the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k represents a conic coefficient; a. the₄、A₆、A₈、A₁₀、A₁₂Respectively representing aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order. The aspherical surface values are shown in Table 15 below.

Watch 15

The magnification-varying data of the zoom lens of the present embodiment is shown in table 16 below.

Surface number	Wide angle end	Long coke end
			D5	0.72	11.60
D11	11.33	0.45
			D21	1.54	1.55
D27	6.85	6.84

TABLE 16

In the second lens group G2 of the zoom lens of this embodiment, the fourth lens L4 is a plastic lens with an Abbe number VD_L456.00. The sixth lens element L6 is a plastic lens element with an Abbe number VD_L620.40. The third lens group G3 includes two low dispersion glass lenses, namely a seventh lens L7 and a ninth lens L9. The refractive index and abbe number of the seventh lens L7 are respectively: ND_L7＝1.50，VD_L781.60; the refractive index and abbe number of the ninth lens L9 are: ND_L9＝1.44，VD_L9＝95.10。

Therefore, with reference to fig. 33 to 40 and the related design parameters and data in tables 1 and 14 to 16, by using an optical structure of a four-group structure with an iris diaphragm and a specific power combination, the aperture of the zoom lens can reach F1.4, the brightness of an image can be ensured in a low-illumination environment, and the wide-field, small-volume, low-cost and imaging performance with a resolution of 4k or more are considered. And adopt glass and plastic mixed lens structure, the glass lens of reasonable distribution anomalous dispersion and high refractive index reach high-quality imaging effect, have good resolving power, realize small, reduce the design cost while guaranteeing great magnification. And, the maximization of imaging performance is achieved in a volume as small as possible.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A zoom lens includes, in order from an object side to an image side along an optical axis: a first lens group (G1) having a positive optical power, a second lens group (G2) having a negative optical power, a stop (stop), a third lens group (G3) having a positive optical power, and a fourth lens group (G4) having a positive optical powerThe second lens group (G2) and the fourth lens group (G4) are moved along the optical axis, characterized in that the distance (d) from the last face of the first lens group (G1) to the first face of the second lens group (G2) at the telephoto end of the zoom lens_12t) A distance (d) from a last surface of the first lens group (G1) to a first surface of the second lens group (G2) at a wide-angle end of the zoom lens_12w) And a focal length (fw) of the zoom lens at a wide-angle end satisfies a relation: d is not more than 0.7_12t-d_12w)/fw≤1.2。

2. The zoom lens according to claim 1, wherein the first lens group (G1) comprises at least two lenses having positive optical power and one lens having negative optical power;

the image side surface of the lens of the first lens group (G1) closest to the image surface is a concave surface;

the lens of the first lens group (G1) closest to the object plane has negative focal power, and the object side surface of the lens of the first lens group (G1) closest to the object plane is convex, and the image side surface is concave.

3. The zoom lens according to claim 1 or 2, wherein a distance (TTL) from a first surface to an image surface of the first lens group (G1) and an imaging target surface diameter (Φ) of the zoom lens satisfy a relation: TTL/phi is more than or equal to 4 and less than or equal to 7.5.

4. The zoom lens as claimed in claim 1, wherein the second lens group (G2) comprises at least one lens with positive power, two lenses with negative power and two plastic lenses;

the object side surface of the lens of the second lens group (G2) closest to the image surface is a convex surface.

5. The zoom lens as claimed in claim 4, wherein the lenses of the second lens group (G2) closest to the image plane are plastic lenses.

6. A zoom lens according to claim 1, 4 or 5, wherein the second lens group (G2) comprises at least 1 Abbe number (VD)₂₁) A plastic lens satisfying the following relationship: VD₂₁≥50；

The second lens group (G2) further comprises at least 1 Abbe number (VD)₂₂) A plastic lens satisfying the following relationship: VD₂₂≤30。

7. The zoom lens according to claim 1, wherein the third lens group (G3) comprises at least five lenses;

the third lens group (G3) at least comprises two lenses with negative focal power, two lenses with positive focal power, two plastic lenses and a cemented lens;

the lens of the third lens group (G3) closest to the image plane has negative power, and the image side surface of the lens of the third lens group (G3) closest to the image plane is concave.

8. A zoom lens according to claim 1 or 7, wherein the focal length (f3) of the third lens group (G3) and the focal length (fw) of the zoom lens at the wide-angle end satisfy the relation: f3/fw is more than or equal to 0.8 and less than or equal to 2.

9. A zoom lens according to claim 1 or 7, wherein the third lens group (G3) comprises 1 or at least 1 low dispersion glass lens, and the Abbe number (VD) and refractive index (ND) of the lens satisfy the following relations:

65≤VD≤100；

1.4≤ND≤1.60。

10. the zoom lens as claimed in claim 1, wherein the fourth lens group (G4) comprises at least two lenses with positive power, one lens with negative power and two plastic lenses;

the lens of the fourth lens group (G4) closest to the object plane has positive optical power;

the lens of the fourth lens group (G4) closest to the image surface is a plastic lens.

11. The zoom lens according to claim 1, wherein a distance (d) from a last face of the first lens group (G1) to a first face of the second lens group (G2) at the telephoto end of the zoom lens_12t) A distance (d) from a last surface of the first lens group (G1) to a first surface of the second lens group (G2) at a wide-angle end of the zoom lens_12w) And the distance (TTL) from the first surface to the image surface of the first lens group (G1) satisfies the relation: TTL/(d) of 3 ≤_12t-d_12w)≤6。

12. The zoom lens according to claim 1, wherein a distance (d) from a last face of the first lens group (G1) to a first face of the second lens group (G2) at the telephoto end of the zoom lens_12t) A distance (d) from a last surface of the first lens group (G1) to a first surface of the second lens group (G2) at a wide-angle end of the zoom lens_12w) And a focal length (fw) of the zoom lens at a wide angle end and a focal length (ft) of the zoom lens at a telephoto end satisfy the relation: less than or equal to 3 (d)_12t-d_12w)/(ft/fw)≤6.5。