CN218497253U - Zoom lens - Google Patents

Abstract

The embodiment of the utility model provides a zoom lens, relate to optical lens technical field, including the compensation lens group with negative focal power, the fixed lens group with positive focal power, the zoom lens group with positive focal power that arrange in proper order from the object space to the image space along the optical axis; satisfies the following conditions: Z/G is more than or equal to 1.68 and less than or equal to 16.84; B/G is more than or equal to-22.70 and less than or equal to-3.24; wherein B is the focal power of the compensation lens group, G is the focal power of the fixed lens group, and Z is the focal power of the variable power lens group. The embodiment of the utility model provides a zoom lens to realize that zoom lens's big light ring, small volume, super wide angle and day night are confocal.

Description

Zoom lens

Technical Field

The utility model relates to an optical lens technique especially relates to a zoom lens.

Background

Because the field angle of the fixed-focus lens is fixed, one product can only be applied to specific scenes, so that the fixed-focus lens cannot meet the use requirement in many scenes. The zoom lens has variable focal length, the field angle can be changed in a certain range, and the zoom lens can be suitable for various application scenes, so that the zoom lens has wider application in the field of security monitoring.

At present, in order to achieve performance of large-aperture wide-angle zoom lenses on the market, multiple glass aspheric lenses are often used, so that cost is increased, the large-aperture wide-angle zoom lenses are large in size and do not have an infrared confocal function, and special occasions cannot be used, so that the market provides wider requirements for small-size security zoom lenses.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a zoom lens to realize that zoom lens's big light ring, small volume, super wide angle and day night are confocal.

An embodiment of the present invention provides a zoom lens, including a compensation lens group having negative focal power, a fixed lens group having positive focal power, and a zoom lens group having positive focal power, which are sequentially arranged along an optical axis from an object space to an image space; satisfies the following conditions:

1.68≤Z/G≤16.84；-22.70≤B/G≤-3.24；

wherein B is the focal power of the compensation lens group, G is the focal power of the fixed lens group, and Z is the focal power of the variable power lens group.

Optionally, the compensation lens group includes a first lens, a second lens and a third lens arranged in order from an object side to an image side along an optical axis;

the fixed lens group includes a fourth lens;

the variable power lens group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from an object side to an image side along an optical axis.

Optionally, the first lens, the second lens, and the sixth lens have negative optical power, the third lens, the fourth lens, the fifth lens, and the seventh lens have positive optical power, the eighth lens has positive optical power or negative optical power, and the ninth lens has positive optical power or negative optical power.

Optionally, the sixth lens and the seventh lens constitute a cemented doublet.

Optionally, the first lens, the sixth lens and the seventh lens are glass spherical lenses, and the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens and the ninth lens are aspheric lenses.

Optionally, the following are satisfied:

-14.72≤φ1/φ4≤-2.11；

-9.10≤φ2/φ4≤-1.59；

0.27≤φ3/φ4≤8.37；

3.35≤φ5/φ4≤18.31；

-5.52≤(φ6+φ7)/φ4≤0.01；

-9.08≤φ8/φ4≤6.93；

-5.77≤φ9/φ4≤7.68；

wherein, Φ 1 is an optical power of the first lens, Φ 2 is an optical power of the second lens, Φ 3 is an optical power of the third lens, Φ 4 is an optical power of the fourth lens, Φ 5 is an optical power of the fifth lens, Φ 6 is an optical power of the sixth lens, Φ 7 is an optical power of the seventh lens, Φ 8 is an optical power of the eighth lens, and Φ 9 is an optical power of the ninth lens.

Optionally, it satisfies:

1.50≤n1≤1.92；

1.44≤n2≤1.69；

1.51≤n3≤1.77；

1.46≤n4≤1.68；

1.43≤n5≤1.89；

1.50≤n6≤1.87；

1.42≤n7≤1.75；

1.52≤n8≤1.73；

1.51≤n9≤1.70；

wherein n1 is a refractive index of the first lens, n2 is a refractive index of the second lens, n3 is a refractive index of the third lens, n4 is a refractive index of the fourth lens, n5 is a refractive index of the fifth lens, n6 is a refractive index of the sixth lens, n7 is a refractive index of the seventh lens, n8 is a refractive index of the eighth lens, and n9 is a refractive index of the ninth lens.

Optionally, it satisfies:

Fw≤1.5；Ft≤2.5；

and Fw is the diaphragm at the wide-angle end of the zoom lens, and Ft is the diaphragm at the telephoto end of the zoom lens.

Optionally, the field angle of the zoom lens at an image plane Φ 6.6mm satisfies the following condition:

FOV-w≥100；FOV-t≤65°；

wherein, FOV-w is the diagonal angle of view of the wide-angle end of the zoom lens, and FOV-t is the diagonal angle of view of the telephoto end of the zoom lens.

Optionally, it satisfies:

TTL/f≤25；

wherein f is the focal length of the zoom lens, and TTL is the total length of the zoom lens.

The embodiment of the utility model provides an among the zoom lens, compensation lens group, fixed lens group and zoom lens group satisfy: Z/G is more than or equal to 1.68 and less than or equal to 16.84, B/G is more than or equal to-22.70 and less than or equal to-3.24, and the confocal point of the zoom lens with large aperture, small volume, ultra-wide angle and day and night is realized by reasonably distributing the focal power. The zoom lens can obtain a focal length range of 3.2 mm-9.7 mm on the premise that TTL is less than or equal to 52mm, is matched with a 1/2.7 inch target surface, and has the effects of high imaging quality, large aperture and day and night confocal.

Drawings

Fig. 1 is a detailed structural diagram of a wide-angle end of a zoom lens according to one embodiment of the present invention;

FIG. 2 is a spherical aberration curve diagram at the wide-angle end of a zoom lens according to the first embodiment;

FIG. 3 is a diagram of field distortion at the wide-angle end of a zoom lens according to the first embodiment;

FIG. 4 is a light fan diagram at the wide-angle end of a zoom lens according to the first embodiment;

FIG. 5 is a spherical aberration diagram of a telephoto end of a zoom lens according to an embodiment;

FIG. 6 is a diagram illustrating distortion of field curvature at the telephoto end of a zoom lens according to an embodiment;

FIG. 7 is a diagram of light fans at the telephoto end of a zoom lens according to an embodiment;

FIG. 8 is a detailed configuration diagram of a wide-angle end of a zoom lens according to a second embodiment;

FIG. 9 is a spherical aberration curve diagram at the wide-angle end of the zoom lens according to the second embodiment;

FIG. 10 is a diagram of distortion at the wide angle end of a zoom lens according to a second embodiment;

FIG. 11 is a light fan diagram at the wide-angle end of a zoom lens according to a second embodiment;

FIG. 12 is a spherical aberration diagram of the telephoto end of the zoom lens according to the second embodiment;

FIG. 13 is a field curvature distortion diagram of the telephoto end of the zoom lens according to the second embodiment;

FIG. 14 is a diagram of the light fan at the telephoto end of the zoom lens according to the second embodiment;

FIG. 15 is a detailed configuration diagram at the wide-angle end of a zoom lens according to a third embodiment;

FIG. 16 is a spherical aberration curve diagram at the wide-angle end of a zoom lens according to the third embodiment;

FIG. 17 is a field curvature distortion diagram at the wide-angle end of a zoom lens of the third embodiment;

FIG. 18 is a light fan diagram at the wide-angle end of a zoom lens according to a third embodiment;

FIG. 19 is a spherical aberration diagram of the telephoto end of the zoom lens in the third embodiment;

FIG. 20 is a diagram of distortion of the field at the telephoto end of the zoom lens according to the third embodiment;

FIG. 21 is a diagram of the light fan at the telephoto end of the zoom lens in the third embodiment.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Example one

Fig. 1 is a detailed structural diagram of a wide-angle end of a zoom lens according to one embodiment, and referring to fig. 1, the zoom lens includes, arranged in order from an object side to an image side along an optical axis, a compensation lens group G1 having negative power, a fixed lens group G2 having positive power, and a variable power lens group G3 having positive power, where the compensation lens group G1, the fixed lens group G2, and the variable power lens group G3 satisfy:

1.68≤Z/G≤16.84；-22.70≤B/G≤-3.24；

wherein, B is the focal power of the compensation lens group G1, G is the focal power of the fixed lens group G2, and Z is the focal power of the variable power lens group G3.

The embodiment of the utility model provides an among the zoom lens, compensation lens group G1, fixed lens group G2 and zoom lens group G3 satisfy: Z/G is more than or equal to 1.68 and less than or equal to 16.84, B/G is more than or equal to-22.70 and less than or equal to-3.24, and the confocal point of the zoom lens with large aperture, small volume, ultra-wide angle and day and night is realized by reasonably distributing the focal power. The zoom lens can obtain a focal length range of 3.2 mm-9.7 mm on the premise that TTL is less than or equal to 52mm, is matched with a 1/2.7 inch target surface, and has the effects of high imaging quality, large aperture and day and night confocal.

Alternatively, the compensation lens group G1 includes a first lens 1, a second lens 2, and a third lens 3 arranged in order from the object side to the image side along the optical axis. The fixed lens group G2 includes a fourth lens 4. The variable power lens group G3 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, and a ninth lens 9 arranged in this order from the object side to the image side along the optical axis.

Alternatively, the first lens 1, the second lens 2, and the sixth lens 6 have negative optical power, the third lens 3, the fourth lens 4, the fifth lens 5, and the seventh lens 7 have positive optical power, the eighth lens 8 has positive optical power or negative optical power, and the ninth lens 9 has positive optical power or negative optical power.

Alternatively, the sixth lens 6 and the seventh lens 7 constitute a double cemented lens. That is, the surface of the sixth lens 6 adjacent to the seventh lens 7 has the same shape as the surface of the seventh lens 7 adjacent to the sixth lens 6, and is cemented together.

Alternatively, the first lens 1, the sixth lens 6, and the seventh lens 7 are glass spherical lenses, and the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the eighth lens 8, and the ninth lens 9 are aspherical lenses. The aspheric lens may be, for example, a plastic aspheric lens, so that the zoom lens adopts a glass-plastic hybrid structure.

Alternatively, the optical powers of the first lens 1 to the ninth lens 9 satisfy: phi 1/phi 4 is more than or equal to-14.72 and less than or equal to-2.11, phi 2/phi 4 is more than or equal to-9.10 and less than or equal to-1.59,0.27 is more than or equal to phi 3/phi 4 is more than or equal to 8.37,3.35 is more than or equal to phi 5/phi 4 and less than or equal to 18.31, phi 6+ phi 7/phi 4 is more than or equal to-5.52 and less than or equal to (phi 6+ phi 7)/phi 4 and less than or equal to 0.01, phi 8/phi 4 is more than or equal to-9.08 and less than or equal to 6.93, and phi 9/phi 4 is more than or equal to-5.77 and less than or equal to phi 9/phi 4 and less than or equal to 7.68. Wherein, phi 1 is the focal power of the first lens 1, phi 2 is the focal power of the second lens 2, phi 3 is the focal power of the third lens 3, phi 4 is the focal power of the fourth lens 4, phi 5 is the focal power of the fifth lens 5, phi 6 is the focal power of the sixth lens 6, phi 7 is the focal power of the seventh lens 7, phi 8 is the focal power of the eighth lens 8, and phi 9 is the focal power of the ninth lens 9.

Alternatively, the refractive indices of the first lens 1 to the ninth lens 9 satisfy: n1 is more than or equal to 1.50 and less than or equal to 1.92,1.44 and less than or equal to n2 and less than or equal to 1.69,1.51 and less than or equal to n3 and less than or equal to 1.77,1.46 and less than or equal to n4 and less than or equal to 1.68,1.43 and less than or equal to n5 and less than or equal to 1.89,1.50 and less than or equal to n6 and less than or equal to 1.87,1.42 and less than or equal to n7 and less than or equal to 1.75,1.52 and less than or equal to n8 and less than or equal to 1.73,1.51 and less than or equal to n9 and less than or equal to 1.70. Where n1 is a refractive index of the first lens 1, n2 is a refractive index of the second lens 2, n3 is a refractive index of the third lens 3, n4 is a refractive index of the fourth lens 4, n5 is a refractive index of the fifth lens 5, n6 is a refractive index of the sixth lens 6, n7 is a refractive index of the seventh lens 7, n8 is a refractive index of the eighth lens 8, and n9 is a refractive index of the ninth lens 9.

Optionally, the aperture of the zoom lens satisfies: fw is less than or equal to 1.5, and Ft is less than or equal to 2.5. Where Fw is an aperture at the wide-angle end of the zoom lens, and Ft is an aperture at the telephoto end of the zoom lens.

Optionally, the field angle of the zoom lens at the image plane Φ 6.6mm satisfies the following condition: FOV-w is more than or equal to 100, and FOV-t is less than or equal to 65 degrees. Wherein, FOV-w is the diagonal angle of view of the wide-angle end of the zoom lens, and FOV-t is the diagonal angle of view of the telephoto end of the zoom lens.

Optionally, the focal length of the zoom lens and the total length of the zoom lens satisfy the following condition: TTL/f is less than or equal to 25. Wherein f is the focal length of the zoom lens, and TTL is the total length of the zoom lens.

Illustratively, the zoom lens further includes a STOP, which is located between the fixed lens group G2 and the variable power lens group G3.

TABLE 1 design values of zoom lens in the first embodiment

Number of noodles	Surface type	Radius of curvature (mm)	Thickness (mm)	Refractive index	Abbe number	Coefficient of K
							1	Spherical surface	133.455	0.840	1.66	65.0
2	Spherical surface	6.790	4.864
							3	Aspherical surface	37.726	1.352	1.54	60.0	0.046
4	Aspherical surface	7.313	0.882			-5.168
							5	Aspherical surface	17.530	2.049	1.65	23.2	-16.243
6	Aspherical surface	403.695	Variable pitch 1			822.682
							7	Aspherical surface	25.899	1.025	1.53	45.0	-9.690
8	Aspherical surface	49.383	1.315			93.448
							Stop	PL	Infinity	8.403
10	Spherical surface	Infinity	Variable pitch 2
							11	Aspherical surface	6.696	4.945	1.50	85.0	-0.139
12	Aspherical surface	-9.186	0.077			-2.688
							13	Spherical surface	-28.204	0.700	1.61	41.2
14	Spherical surface	5.909	3.895	1.44	75.7
							15	Spherical surface	-10.389	0.070
16	Aspherical surface	-24.094	1.932	1.64	27.8	7.913
							17	Aspherical surface	-16.930	0.070			-90.483
18	Aspherical surface	6.481	0.837	1.61	27.8	0.490
							19	Aspherical surface	4.582	0.891			-5.771
20	Spherical surface	Infinity	4.945

Table 1 shows a design value of a zoom lens in the first embodiment, the specific value can be adjusted according to the product requirement, which is not a limitation of the embodiments of the present invention. The zoom lenses shown in table 1 may be those shown in fig. 1. A lens generally comprises two surfaces, each of which is a refractive surface. The surface numbers in table 1 are numbered according to the surface of each lens. Here, the surface number "1" indicates the front surface of the first lens 1, the surface number "2" indicates the rear surface of the first lens 1, and so on, which is not described herein again. Note that "STOP" in the column of "face number" indicates the plane in which the STOP is located. The radius of curvature represents the degree of curvature of the lens surface, with positive values of the radius of curvature indicating that the center of curvature is on the image side of the surface and negative values of the radius of curvature indicating that the center of curvature is on the image side of the surface. The numerical values in the column for "thickness" represent the axial distance from the current surface to the next surface. The column "refractive index" indicates the refractive index of the medium between the current surface to the next surface. The spaces in the column "refractive index" are the refractive index of air, which is 1. The abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light, and the blank space represents that the current position is air. Wherein, under wide angle, the value of the variable interval 1 is 11.829mm, and the value of the variable interval 2 is-0.891 mm. In the tele, the value of variable pitch 1 was 0.764mm and the value of variable pitch 2 was-8.065 mm.

Optionally, the surface of the aspheric lens satisfies the formula:

wherein Z is the axial rise of the surface in the Z direction, and r is the height of the aspheric surface, that is, Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction; c is the curvature of the fitting sphere, and is the reciprocal of the curvature radius in numerical value, c =1/R, and R represents the paraxial curvature radius of the mirror surface; k is fitting cone coefficient, A, B, C, D, E, F is aspheric coefficient, specifically A, B, C, D, E, F, G is 4 th, 6 th, 8 th, 10 th, 12 th, 14 th and 16 th order coefficient of aspheric polynomial, respectively.

Table 2 example a design value of aspherical surface coefficient of lens in zoom lens

Table 2 shows a design value of aspheric coefficients of lenses in a zoom lens of the first embodiment, and the specific value can be adjusted according to product requirements, which is not limited to the embodiment of the present invention. The zoom lenses shown in table 2 may be those shown in fig. 1. The column of "surface number" in table 2 corresponds to the meaning of "surface number" in table 1, and for example, the surface number "3" also indicates the front surface of the second lens 2. "E" in the embodiments of the present invention indicates an index with a base of 10.

The optical system of the first embodiment achieves the following technical indexes: at wide angle, the aperture is 1.3, the focal length is 3.3mm, and the field angle is 136.9 °. In tele, the aperture is 2.3, the focal length is 9.3mm, and the field angle is 40.5 °.

Example two

The same parts as those in the first embodiment will not be described herein.

TABLE 3 design value of zoom lens in EXAMPLE II

Table 3 shows a design value of the zoom lens in the second embodiment, and the specific value can be adjusted according to the product requirement, which is not a limitation of the embodiment of the present invention. The zoom lenses shown in table 3 may be those shown in fig. 8. At wide angle, the value of variable pitch 1 is 12.596mm, and the value of variable pitch 2 is-0.714 mm. In the long coke, the value of the variable pitch 1 was 0.867mm, and the value of the variable pitch 2 was-8.088 mm.

TABLE 4 design values of aspherical coefficients of lenses in zoom lens in example II

Number of noodles

A

B

C

D

E

F

G

3

-4.35E-04

1.85E-05

-1.05E-06

5.18E-08

-1.29E-09

1.26E-11

0

4

-4.10E-05

3.16E-05

-1.87E-06

4.05E-08

-2.40E-10

-1.82E-12

0

5

-1.64E-05

3.95E-05

-1.59E-06

-5.94E-10

1.04E-09

-1.56E-11

0

6

-9.74E-05

8.96E-06

-2.85E-08

-2.35E-08

8.47E-10

-9.74E-12

0

7

4.80E-04

-3.64E-07

-1.57E-06

1.28E-07

-4.20E-09

5.16E-11

0

8

-5.02E-05

2.39E-05

-3.08E-06

2.05E-07

-6.38E-09

7.63E-11

0

11

-2.74E-05

3.08E-06

-2.12E-07

7.78E-09

-1.12E-10

-3.79E-14

0

12

9.43E-04

-3.75E-05

1.18E-06

-2.39E-08

2.04E-10

-1.32E-13

0

16

3.09E-03

-2.03E-04

1.32E-05

-6.33E-07

2.52E-08

-6.15E-10

0

17

1.01E-03

3.12E-05

-1.43E-05

-1.36E-08

2.54E-07

-1.45E-08

0

18

-6.80E-03

4.31E-04

-9.44E-05

5.29E-06

2.42E-07

-2.83E-08

0

19

-5.80E-03

5.57E-04

-1.48E-04

1.81E-05

-1.07E-06

2.27E-08

0

Table 4 is a design value of aspheric coefficients of lenses in the zoom lens in the second embodiment, and the specific value can be adjusted according to product requirements, which is not a limitation of the embodiments of the present invention. The zoom lenses shown in table 4 may be those shown in fig. 8.

The optical system of the second embodiment achieves the following technical indexes: at wide angle, the aperture is 1.3, the focal length is 3.2mm, and the field angle is 134.5 °. In tele, the aperture is 2.3, the focal length is 9.7mm, and the field angle is 39.1 °.

EXAMPLE III

The same parts as those in the first embodiment will not be described herein.

TABLE 5 design value of zoom lens in the third embodiment

Table 5 shows a design value of the zoom lens in the third embodiment, the specific value can be adjusted according to the product requirement, which is not a limitation of the embodiments of the present invention. The zoom lenses shown in table 5 may be those shown in fig. 15. At wide angle, the value of variable pitch 1 is 11.6086mm, and the value of variable pitch 2 is-0.946 mm. In tele, the value of variable pitch 1 is 1.255mm, and the value of variable pitch 2 is-8.160 mm.

TABLE 6 design values of aspherical coefficients of lenses in zoom lens in example III

Number of noodles

A

B

C

D

E

F

G

3

-8.99E-04

2.23E-05

-9.65E-07

3.74E-08

-9.17E-10

1.07E-11

-3.88E-14

4

2.14E-04

-1.65E-05

-8.93E-08

4.10E-08

-1.89E-09

3.11E-11

-1.15E-13

5

4.36E-04

-7.74E-06

2.46E-07

-9.49E-09

2.91E-10

-4.27E-12

4.66E-14

6

-1.50E-04

1.16E-05

-2.83E-07

8.19E-10

1.13E-10

5.21E-12

-1.45E-13

7

1.13E-04

1.24E-05

-1.96E-06

1.17E-07

-3.37E-09

3.29E-11

1.78E-13

8

-7.03E-05

1.09E-05

-1.59E-06

8.70E-08

-2.22E-09

1.05E-11

3.25E-13

11

-2.27E-04

1.12E-06

-1.83E-07

7.27E-09

-1.70E-10

7.93E-13

4.01E-14

12

8.11E-04

-2.01E-05

3.95E-07

-1.69E-09

2.48E-11

-3.08E-12

1.01E-13

16

1.69E-03

-1.23E-04

2.68E-06

-7.60E-08

-2.99E-09

5.31E-10

-1.58E-11

17

2.30E-04

-8.18E-05

-2.00E-06

1.00E-07

1.84E-08

-1.20E-09

1.93E-11

18

-4.23E-03

3.33E-06

-2.17E-06

4.12E-08

1.30E-08

2.51E-10

-4.20E-11

19

-9.82E-04

-4.81E-05

1.78E-06

5.67E-09

-3.76E-09

1.33E-09

-6.73E-11

Table 6 shows a design value of aspheric coefficients of lenses in the zoom lens in the third embodiment, and the specific value can be adjusted according to product requirements, which is not a limitation of the embodiments of the present invention. The zoom lens shown in table 6 may be that shown in fig. 15.

The optical system of the third embodiment achieves the following technical indexes: at wide angle, the aperture is 1.3, the focal length is 3.3mm, and the field angle is 150.0 °. In tele, the aperture is 2.3, the focal length is 9.3mm, and the field angle is 40.6 °.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles 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 modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A zoom lens is characterized by comprising a compensation lens group with negative focal power, a fixed lens group with positive focal power and a variable power lens group with positive focal power which are sequentially arranged from an object side to an image side along an optical axis; satisfies the following conditions:

1.68≤Z/G≤16.84；-22.70≤B/G≤-3.24；

wherein B is the focal power of the compensation lens group, G is the focal power of the fixed lens group, and Z is the focal power of the variable power lens group.

2. The zoom lens according to claim 1, wherein the compensation lens group includes a first lens, a second lens, and a third lens arranged in order from an object side to an image side along an optical axis;

the fixed lens group includes a fourth lens;

the variable power lens group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from an object side to an image side along an optical axis.

3. The zoom lens according to claim 2, wherein the first lens, the second lens, and the sixth lens have negative optical power, the third lens, the fourth lens, the fifth lens, and the seventh lens have positive optical power, the eighth lens have positive optical power or negative optical power, and the ninth lens have positive optical power or negative optical power.

4. The zoom lens according to claim 2, wherein the sixth lens and the seventh lens constitute a cemented doublet.

5. The zoom lens according to claim 2, wherein the first lens, the sixth lens, and the seventh lens are glass spherical lenses, and the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, and the ninth lens are aspherical lenses.

6. The zoom lens according to claim 2, wherein:

-14.72≤φ1/φ4≤-2.11；

-9.10≤φ2/φ4≤-1.59；

0.27≤φ3/φ4≤8.37；

3.35≤φ5/φ4≤18.31；

-5.52≤(φ6+φ7)/φ4≤0.01；

-9.08≤φ8/φ4≤6.93；

-5.77≤φ9/φ4≤7.68；

wherein, Φ 1 is an optical power of the first lens, Φ 2 is an optical power of the second lens, Φ 3 is an optical power of the third lens, Φ 4 is an optical power of the fourth lens, Φ 5 is an optical power of the fifth lens, Φ 6 is an optical power of the sixth lens, Φ 7 is an optical power of the seventh lens, Φ 8 is an optical power of the eighth lens, and Φ 9 is an optical power of the ninth lens.

7. The zoom lens according to claim 2, wherein:

1.50≤n1≤1.92；

1.44≤n2≤1.69；

1.51≤n3≤1.77；

1.46≤n4≤1.68；

1.43≤n5≤1.89；

1.50≤n6≤1.87；

1.42≤n7≤1.75；

1.52≤n8≤1.73；

1.51≤n9≤1.70；

wherein n1 is a refractive index of the first lens, n2 is a refractive index of the second lens, n3 is a refractive index of the third lens, n4 is a refractive index of the fourth lens, n5 is a refractive index of the fifth lens, n6 is a refractive index of the sixth lens, n7 is a refractive index of the seventh lens, n8 is a refractive index of the eighth lens, and n9 is a refractive index of the ninth lens.

8. The zoom lens according to claim 1, wherein:

Fw≤1.5；Ft≤2.5；

and Fw is the diaphragm at the wide-angle end of the zoom lens, and Ft is the diaphragm at the telephoto end of the zoom lens.

9. The zoom lens according to claim 1, wherein an angle of view of the zoom lens at an image plane Φ 6.6mm satisfies the following condition:

FOV-w≥100；FOV-t≤65°；

wherein, FOV-w is the diagonal angle of view of the wide-angle end of the zoom lens, and FOV-t is the diagonal angle of view of the telephoto end of the zoom lens.

10. The zoom lens according to claim 1, wherein:

TTL/f≤25；

wherein f is the focal length of the zoom lens, and TTL is the total length of the zoom lens.

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