Zoom lens

Abstract

The present invention relates to a zoom lens, comprising a first lens group (G1) with positive focal power, a second lens group (G2) with negative focal power, a stop (STO), a third lens group (G3) with positive or negative focal power, a fourth lens group (G4) with positive focal power, and a fifth lens group (G5) with positive focal power, which are arranged in sequence from the object side to the image side along an optical axis, and a sixth lens group (G6) with positive or negative focal power is also included on the image side of the fifth lens group (G5). The zoom lens of the present invention has the characteristics of high resolution, large magnification ratio, and low distortion.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to a zoom lens. Background Art

[0002] With the development of chip technologies such as CCD and CMOS, coupled with the increasing demand for video conferencing image quality, the corresponding imaging quality standards for supporting optical systems are also getting higher and higher. In order to meet this trend, the optical lenses installed in video conferencing products are required to have high resolution, large magnification, low distortion and other performance.

[0003] However, existing high-magnification zoom lenses still have some performance defects, which limit their use scenarios. For example, the resolution is insufficient, the wide-angle angle is not large enough, the shooting range is limited, and the telephoto magnification is not large enough, the magnification effect is insufficient. In addition, there are defects such as large distortion and serious deformation of the image. The focusable object distance range of existing lenses is not wide enough, resulting in limited use scenarios. Summary of the invention

[0004] An object of the present invention is to provide a zoom lens.

[0005] To achieve the above-mentioned object of the invention, the present invention provides a zoom lens, comprising a first lens group with positive optical power, a second lens group with negative optical power, an aperture, a third lens group with positive or negative optical power, a fourth lens group with positive optical power and a fifth lens group with positive optical power, which are arranged in sequence from the object side to the image side along the optical axis, and a sixth lens group with positive or negative optical power is also included on the image side of the fifth lens group, and the sixth lens group is a fixed lens group.

[0006] According to one aspect of the present invention, the first lens group and the third lens group are fixed lens groups;

[0007] The second lens group and the fourth lens group are variable-power lens groups, and the fifth lens group is a focusing lens group.

[0008] According to one aspect of the present invention, the first lens group includes at least three positive lenses and one negative lens.

[0009] According to one aspect of the present invention, the first lens group includes at least one biconvex positive lens and one convex-concave positive lens.

[0010] According to one aspect of the present invention, the second lens group includes at least one positive lens and two negative lenses.

[0011] According to one aspect of the present invention, the second lens group includes at least one convexo-concave negative lens.

[0012] According to one aspect of the present invention, the third lens group includes at least one positive lens and one negative lens.

[0013] According to one aspect of the present invention, the third lens group includes at least one biconcave negative lens.

[0014] According to one aspect of the present invention, the fourth lens group includes at least two positive lenses and one negative lens.

[0015] According to one aspect of the present invention, the fourth lens group includes at least one biconvex positive lens and one convex-concave lens.

[0016] According to one aspect of the present invention, the fifth lens group includes at least one positive lens and one negative lens.

[0017] According to one aspect of the present invention, the fifth lens group includes at least one convex-concave lens.

[0018] According to one aspect of the present invention, the sixth lens group includes at least one meniscus lens.

[0019] According to one aspect of the present invention, the zoom lens comprises at least two cemented lens groups.

[0020] According to one aspect of the present invention, the fourth lens group includes at least one cemented lens group.

[0021] According to one aspect of the present invention, the focal length FA of the cemented lens group and the focal length F4 of the fourth lens group satisfy the following relationship: -8.84≤FA / F4≤19.70.

[0022] According to one aspect of the present invention, the zoom lens includes at least five aspherical lenses.

[0023] According to one aspect of the present invention, at least three of the aspheric lenses are made of plastic.

[0024] According to one aspect of the present invention, the focal length F1 of the first lens group satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens respectively:

[0025] 13.10≤F1 / Fw≤19.86;

[0026] 0.72≤F1 / Ft≤1.11.

[0027] According to one aspect of the present invention, the focal length F2 of the second lens group satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens respectively:

[0028] -2.99≤F2 / Fw≤-2.06;

[0029] -0.17≤F2 / Ft≤-0.11.

[0030] According to one aspect of the present invention, the focal length F3 of the third lens group satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens respectively:

[0031] -133.09≤F3 / Fw≤168.21;

[0032] -10.75≤F3 / Ft≤12.70.

[0033] According to one aspect of the present invention, the focal length F4 of the fourth lens group satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens respectively:

[0034] 5.06≤F4 / Fw≤6.35;

[0035] 0.28≤F4 / Ft≤0.36.

[0036] According to one aspect of the present invention, the focal length F5 of the fifth lens group satisfies the following relationship with the wide-angle end focal length Fw and the telephoto end focal length Ft of the zoom lens respectively:

[0037] 8.17≤F5 / Fw≤18.78;

[0038] 0.45≤F5 / Ft≤1.05.

[0039] According to one aspect of the present invention, the focal length F6 of the sixth lens group satisfies the following relationship with the wide-angle end focal length Fw and the telephoto end focal length Ft of the zoom lens respectively:

[0040] -77.80≤F6 / Fw≤55.08;

[0041] -4.33≤F6 / Ft≤3.07.

[0042] According to one aspect of the present invention, the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens respectively satisfy the following relationship with the total optical length TTL of the zoom lens:

[0043] 0.02≤Fw / TTL≤0.03;

[0044] 0.49≤Ft / TTL≤0.52.

[0045] According to the concept of the present invention, a zoom lens with high resolution, large magnification and low distortion is provided.

[0046] According to one solution of the present invention, by reasonably setting the position and optical focal length of the fixed, variable magnification and focusing lens groups, a wider range of focusable object distances can be achieved, so that the object distance can be clearly focused from 0.1m to infinity throughout the entire zoom process to achieve better imaging effects, and the magnification ratio is relatively high, from the wide-angle end to the telephoto end, the ratio variation range can reach more than 20X.

[0047] According to one solution of the present invention, by reasonably setting the optical focal length and shape of the lenses in each lens group, and then reasonably distributing the positive and negative optical focal lengths of the group, the resolution can reach above 4K, and the wide-angle field of view can be wide, reaching above 85 degrees.

[0048] According to one solution of the present invention, by properly arranging the glued lens group, the absolute value of the distortion over the entire zoom range is less than 5%, thereby ensuring that the deformation of the captured image is small, the tolerance of individual components and assembly is good, and the manufacturability is good.

[0049] According to one solution of the present invention, a glass-plastic hybrid structure is adopted and aspheric lenses are reasonably arranged, which can reduce the design cost while ensuring a large magnification.

[0050] According to one scheme of the present invention, by reasonably setting the relationship between the focal length of each lens group and the focal length of the wide-angle end and the telephoto end of the lens, the focus object distance range can be made wider, so that the object distance from 0.1m to infinity can be clearly focused throughout the zoom process, so as to achieve better imaging effects, and make the magnification higher, from the wide-angle end to the telephoto end, the magnification range can reach more than 20X.

[0051] According to one solution of the present invention, by reasonably setting the relationship between the focal length of the wide-angle end and the telephoto end of the lens and the total optical length, the magnification ratio can be higher. From the wide-angle end to the telephoto end, the magnification variation range can reach more than 20X, and the requirement of miniaturization of the lens can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A diagram schematically showing the structure of a zoom lens according to a first embodiment of the present invention;

[0053] Figure 2 A diagram schematically showing the structure of a zoom lens according to a second embodiment of the present invention;

[0054] Figure 3 A schematic diagram showing the structure of a zoom lens according to a third embodiment of the present invention;

[0055] Figure 4 A diagram schematically showing the structure of a zoom lens according to a fourth embodiment of the present invention;

[0056] Figure 5 A diagram schematically shows the structure of a zoom lens according to a fifth embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0058] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0059] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0060] See also Figure 1 The zoom lens of the present invention comprises a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, an aperture STO, a third lens group G3 with positive or negative focal power, a fourth lens group G4 with positive focal power, a fifth lens group G5 with positive focal power, and a sixth lens group G6 with positive or negative focal power, which are arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens group G1, the third lens group G3 and the sixth lens group G6 are fixed lens groups. The second lens group G2 and the fourth lens group G4 are variable magnification lens groups, and the fifth lens group G5 is a focusing lens group. In this way, the focusable object distance range is wide, so that the object distance can be clearly focused from 0.1m to infinity throughout the zooming process, the imaging effect is good, the variable magnification ratio is high, and the ratio variation range can reach more than 20X from the wide-angle end to the telephoto end.

[0061] In the present invention, the first lens group G1 includes at least three positive lenses and one negative lens. The first lens group G1 includes at least one biconvex positive lens and one convexo-concave positive lens. The second lens group G2 includes at least one positive lens and two negative lenses. The second lens group G2 includes at least one convexo-concave negative lens. The third lens group G3 includes at least one positive lens and one negative lens. The third lens group G3 includes at least one biconcave negative lens. The fourth lens group G4 includes at least two positive lenses and one negative lens. The fourth lens group G4 includes at least one biconvex positive lens and one convexo-concave lens. The fifth lens group G5 includes at least one positive lens and one negative lens. The fifth lens group G5 includes at least one convexo-concave lens. The sixth lens group G6 includes at least one concave-convex lens. In this way, by reasonably allocating the positive and negative optical power and shape of the lenses, and reasonably distributing the positive and negative optical power of the groups, the resolution can reach more than 4K, and the wide-angle end field of view is wide, reaching more than 85 degrees.

[0062] In the present invention, along the direction from the object side to the image side of the optical axis, the first lens group G1 includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4, the second lens group G2 includes a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8, the third lens group G3 includes a ninth lens L9 and a tenth lens L10, the fourth lens group G4 includes an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13 and a fourteenth lens L14, the fifth lens group G5 includes a fifteenth lens L15, a sixteenth lens L16 and a seventeenth lens L17, and the sixth lens group G6 includes an eighteenth lens L18.

[0063] In the present invention, the zoom lens comprises at least two cemented lens groups. Among them, the fourth lens group G4 comprises at least one cemented lens group, and the focal length FA of the cemented lens group and the focal length F4 of the fourth lens group G4 satisfy the following relationship: -8.84≤FA / F4≤19.70. In this way, the absolute value of the distortion over the entire zoom range is less than 5%, ensuring that the deformation of the captured image is small, and the single component and assembly tolerances are good, and the manufacturability is good.

[0064] In the present invention, the zoom lens comprises at least five aspherical lenses, at least three of which are made of plastic. Thus, the glass-plastic hybrid structure can reduce the design cost while ensuring a large magnification.

[0065] In the present invention, the focal length F1 of the first lens group G1 satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens: 13.10≤F1 / Fw≤19.86; 0.72≤F1 / Ft≤1.11. The focal length F2 of the second lens group G2 satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens: -2.99≤F2 / Fw≤-2.06; -0.17≤F2 / Ft≤-0.11. The focal length F3 of the third lens group G3 satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens: -133.09≤F3 / Fw≤168.21; -10.75≤F3 / Ft≤12.70. The focal length F4 of the fourth lens group G4 satisfies the following relationship with the wide-angle focal length Fw and the telephoto focal length Ft of the zoom lens: 5.06≤F4 / Fw≤6.35; 0.28≤F4 / Ft≤0.36. The focal length F5 of the fifth lens group G5 satisfies the following relationship with the wide-angle focal length Fw and the telephoto focal length Ft of the zoom lens: 8.17≤F5 / Fw≤18.78; 0.45≤F5 / Ft≤1.05. The focal length F6 of the sixth lens group G6 satisfies the following relationship with the wide-angle focal length Fw and the telephoto focal length Ft of the zoom lens: -77.80≤F6 / Fw≤55.08; -4.33≤F6 / Ft≤3.07. In this way, the focusable object distance range is wider, and the object distance from 0.1m to infinity can be clearly focused throughout the zoom process. The imaging effect is better and the magnification ratio is higher. From the wide-angle end to the telephoto end, the magnification range can reach more than 20X.

[0066] In the present invention, the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens respectively satisfy the following relationship with the total optical length TTL of the zoom lens: 0.02≤Fw / TTL≤0.03; 0.49≤Ft / TTL≤0.52. In this way, the zoom ratio is relatively high, and the ratio range from the wide angle end to the telephoto end can reach more than 20X, and the miniaturization of the lens can be achieved.

[0067] In summary, the zoom lens reasonably distributes the positive and negative optical power and lens shape of the lens, and reasonably distributes the positive and negative optical power of the group, so that the resolution can reach more than 4K. The wide-angle end of the zoom lens has a wide field of view, which can reach more than 85 degrees; the magnification ratio is relatively high, from the wide-angle end to the telephoto end, the magnification range can reach more than 20X; the absolute value of distortion is less than 5% throughout the zoom, which can ensure that the shooting picture is less deformed; the focus range is wide, and the zoom can ensure that the object distance from 0.1m to infinity can be clearly focused throughout the zoom, and the imaging effect is good. In addition, the zoom lens adopts a glass-plastic hybrid structure, which can reduce the design cost while ensuring a large magnification. The single component and assembly tolerance of the zoom lens are also good, so it has good manufacturability.

[0068] The zoom lens of the present invention is described in detail in five embodiments. In the following embodiments, 1, 2, ..., N represent the surfaces of each optical element, the aperture is denoted as STO, and the image surface is denoted as Image. The aspheric surface formula is:

[0069]

[0070] Where z is the axial distance from the surface to the vertex at a height h perpendicular to the optical axis along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the cone coefficient; A4, A6, A8, A 10 , A 12 , A 14 , A 16 ···represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order···aspheric coefficients respectively.

[0071] Parameters of various implementations that specifically meet the above conditional formula are shown in Table 1 below:

[0072]

[0073]

[0074] Table 1

[0075] First Implementation Method

[0076] See also Figure 1 In this embodiment, the second lens group G2 includes two positive lenses and two negative lenses; the third lens group G3 has positive focal length; the fourth lens group G4 includes three positive lenses and one negative lens; the fifth lens group G5 includes two positive lenses and one negative lens; and the sixth lens group G6 has negative focal length.

[0077] The zoom lens of this embodiment includes three cemented lens groups and five aspherical lenses, of which four aspherical lenses are made of plastic. Other parameters are: TTL=125.015mm; FNO(WIDE)=1.88; focal length fw at wide angle=3.48mm; focal length ft at telephoto=62.58mm.

[0078] The parameters of the optical elements in the zoom lens of this embodiment are shown in Table 2 below:

[0079]

[0080]

[0081] Table 2

[0082] The aspheric coefficients of the aspheric lenses in this embodiment are shown in Table 3 below:

[0083]

[0084]

[0085] Table 3

[0086] The zoom lens of this embodiment has the wide-angle end and the telephoto end magnification data as shown in Table 4 below:

[0087] Thickness d Wide angle Telephoto T1 0.83 38.54 T2 40.11 2.4 T3 13.15 1.13 T4 3.239 3.253 T5 4.466 16.472

[0088] Table 4

[0089] Second implementation method

[0090] See also Figure 2 In this embodiment, the second lens group G2 includes one positive lens and three negative lenses; the third lens group G3 has negative optical power; the fourth lens group G4 includes three positive lenses and one negative lens; the fifth lens group G5 includes two positive lenses and one negative lens; the sixth lens group G6 has negative optical power.

[0091] The zoom lens of this embodiment includes three cemented lens groups and five aspherical lenses, of which four aspherical lenses are made of plastic. Other parameters are: TTL=125mm; FNO(WIDE)=1.88; focal length fw at wide angle=3.48mm; focal length ft at telephoto=62.60mm.

[0092] The parameters of the optical elements in the zoom lens of this embodiment are shown in Table 5 below:

[0093]

[0094]

[0095] Table 5

[0096] The aspheric coefficients of the aspheric lenses in this embodiment are shown in Table 6 below:

[0097]

[0098] Table 6

[0099] The zoom lens of this embodiment has the wide-angle end and the telephoto end magnification data as shown in Table 7 below:

[0100] Thickness d Wide angle Telephoto T1 0.8 44.02 T2 45.62 2.4 T3 11.35 1.13 T4 3.245 3.247 T5 4.545 14.763

[0101] Table 7

[0102] The third implementation method

[0103] See also Figure 3In this embodiment, the second lens group G2 includes one positive lens and three negative lenses; the third lens group G3 has positive focal length; the fourth lens group G4 includes two positive lenses and two negative lenses; the fifth lens group G5 includes two positive lenses and one negative lens; the sixth lens group G6 has positive focal length;

[0104] The zoom lens of this embodiment includes three cemented lens groups and five aspherical lenses, wherein the three aspherical lenses are made of plastic. Other parameters are: TTL=126.03mm; FNO(WIDE)=1.88; focal length fw at wide angle=3.48mm; focal length ft at telephoto=62.56mm.

[0105] The parameters of the optical elements in the zoom lens of this embodiment are shown in Table 8 below:

[0106]

[0107]

[0108] Table 8

[0109] The aspheric coefficients of the aspheric lenses in this embodiment are shown in Table 9 below:

[0110]

[0111]

[0112] Table 9

[0113] The zoom lens of this embodiment has the wide-angle end and the telephoto end magnification data as shown in Table 10 below:

[0114] Thickness d Wide angle Telephoto T1 0.8 38.29 T2 39.89 2.4 T3 16.89 1.13 T4 2.99 9.471 T5 5.74 15.019

[0115] Table 10

[0116] Fourth Implementation Method

[0117] See also Figure 4 In this embodiment, the second lens group G2 includes one positive lens and three negative lenses; the third lens group G3 has positive optical power; the fourth lens group G4 includes two positive lenses and two negative lenses; the fifth lens group G5 includes one positive lens and two negative lenses; and the sixth lens group G6 has positive optical power.

[0118] The zoom lens of this embodiment includes two cemented lens groups and six aspherical lenses, five of which are made of plastic. Other parameters are: TTL=125.01mm; FNO(WIDE)=1.89; focal length fw at wide angle=3.55mm; focal length ft at telephoto=63.96mm.

[0119] The parameters of the optical elements in the zoom lens of this embodiment are shown in Table 11 below:

[0120]

[0121]

[0122] Table 11

[0123] The aspheric coefficients of the aspheric lenses in this embodiment are shown in Table 12 below:

[0124]

[0125]

[0126] Table 12

[0127] The zoom lens of this embodiment has the wide-angle end and the telephoto end magnification data as shown in Table 13 below:

[0128] Thickness d Wide angle Telephoto T1 0.8 34.6 T2 36.2 2.4 T3 16.29 1.1 T4 3.53 3.505 T5 3.84 19.055

[0129] Table 13

[0130] Fifth Implementation Method

[0131] See also Figure 5 In this embodiment, the second lens group G2 includes one positive lens and three negative lenses; the third lens group G3 has positive optical power; the fourth lens group G4 includes two positive lenses and two negative lenses; the fifth lens group G5 includes one positive lens and two negative lenses; and the sixth lens group G6 has positive optical power.

[0132] The zoom lens of this embodiment includes three cemented lens groups and seven aspherical lenses, six of which are made of plastic. Other parameters are: TTL=125mm; FNO(WIDE)=1.87; focal length fw at the wide-angle end=3.56mm; focal length ft at the telephoto end=64.09mm.

[0133] The parameters of the optical elements in the zoom lens of this embodiment are shown in Table 14 below:

[0134]

[0135]

[0136]

[0137] Table 14

[0138] The aspheric coefficients of the aspheric lenses in this embodiment are shown in Table 15 below:

[0139]

[0140]

[0141] Table 15

[0142] The zoom lens of this embodiment has the wide-angle end and telephoto end magnification data as shown in Table 16 below:

[0143] Thickness d Wide angle Telephoto T1 0.8 30.55 T2 32.15 2.4 T3 17.85 1.1 T4 3.141 3.103 T5 3.889 20.677

[0144] Table 16

[0145] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A zoom lens, comprising a first lens group (G1) with positive power, a second lens group (G2) with negative power, a stop (STO), a third lens group (G3) with positive or negative power, a fourth lens group (G4) with positive power, and a fifth lens group (G5) with positive power, which are arranged in sequence from the object side to the image side along the optical axis, characterized in that: The image side of the fifth lens group (G5) also includes a sixth lens group (G6) having positive or negative optical power, and the sixth lens group (G6) is a fixed lens group; Along the direction from the object side to the image side of the optical axis, the first lens group (G1) includes a first lens (L1) having negative refractive power, a second lens (L2) having positive refractive power, a third lens (L3) having positive refractive power, and a fourth lens (L4) having positive refractive power; The second lens group (G2) includes a fifth lens (L5) having negative refractive power, a sixth lens (L6), a seventh lens (L7) having negative refractive power, and an eighth lens (L8) having positive refractive power, wherein the refractive power of the sixth lens (L6) is positive or negative; The third lens group (G3) includes a ninth lens (L9) having positive refractive power and a tenth lens (L10) having negative refractive power; The fourth lens group (G4) includes an eleventh lens (L11), a twelfth lens (L12), a thirteenth lens (L13) and a fourteenth lens (L14) having positive refractive power, and the refractive power of the twelfth lens (L12), the thirteenth lens (L13) and the fourteenth lens (L14) is positive or negative; The fifth lens group (G5) includes a fifteenth lens (L15) having negative refractive power, a sixteenth lens (L16) having positive refractive power, and a seventeenth lens (L17), wherein the refractive power of the seventeenth lens (L17) is positive or negative; The sixth lens group (G6) includes an eighteenth lens (L18), and the optical power of the eighteenth lens (L18) is positive or negative.

2. The zoom lens according to claim 1, wherein: The first lens group (G1) and the third lens group (G3) are fixed lens groups; The second lens group (G2) and the fourth lens group (G4) are variable-power lens groups, and the fifth lens group (G5) is a focusing lens group.

3. The zoom lens according to claim 1, wherein: In the first lens group (G1), the second lens (L2) is a biconvex lens, and the fourth lens (L4) is a convex-concave lens.

4. The zoom lens according to claim 1, wherein: In the second lens group (G2), the fifth lens (L5) is a convex-concave lens.

5. The zoom lens according to claim 1, wherein: The tenth lens (L10) is a biconcave lens.

6. The zoom lens according to claim 1, wherein: In the fourth lens group (G4), the eleventh lens (L11) is a biconvex lens, and the twelfth lens (L12) is a convex-concave lens.

7. The zoom lens according to claim 1, wherein: The seventeenth lens (L17) in the fifth lens group (G5) is a convex-concave lens.

8. The zoom lens according to claim 1, wherein: In the sixth lens group (G6), the eighteenth lens (L18) is a meniscus lens.

9. The zoom lens according to claim 1, wherein: The zoom lens comprises at least two cemented lens groups.

10. The zoom lens according to claim 9, wherein: The fourth lens group (G4) includes at least one cemented lens group.

11. The zoom lens according to claim 10, wherein: The focal length FA of the cemented lens group and the focal length F4 of the fourth lens group (G4) satisfy the following relationship: -8.84≤FA / F4≤19.

70.

12. The zoom lens according to claim 1, wherein: The zoom lens comprises at least five aspherical lenses.

13. The zoom lens according to claim 12, wherein: At least three of the aspheric lenses are made of plastic.

14. The zoom lens according to any one of claims 1 to 13, characterized in that: The focal length F1 of the first lens group (G1) satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens: 13.10≤F1 / Fw≤19.86; 0.72≤F1 / Ft≤1.

11.

15. The zoom lens according to any one of claims 1 to 13, characterized in that: The focal length F2 of the second lens group (G2) satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens: -2.99≤F2 / Fw≤-2.06; -0.17≤F2 / Ft≤-0.

11.

16. The zoom lens according to any one of claims 1 to 13, characterized in that: The focal length F3 of the third lens group (G3) satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens: -133.09≤F3 / Fw≤168.21; -10.75≤F3 / Ft≤12.

70.

17. The zoom lens according to any one of claims 1 to 13, characterized in that: The focal length F4 of the fourth lens group (G4) satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens: 5.06≤F4 / Fw≤6.35; 0.28≤F4 / Ft≤0.

36.

18. The zoom lens according to any one of claims 1 to 13, characterized in that: The focal length F5 of the fifth lens group (G5) satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens: 8.17≤F5 / Fw≤18.78; 0.45≤F5 / Ft≤1.

05.

19. The zoom lens according to any one of claims 1 to 13, characterized in that: The focal length F6 of the sixth lens group (G6) satisfies the following relationship with the focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens: -77.80≤F6 / Fw≤55.08; -4.33≤F6 / Ft≤3.

07.

20. The zoom lens according to any one of claims 1 to 13, characterized in that: The focal length Fw at the wide angle end and the focal length Ft at the telephoto end of the zoom lens respectively satisfy the following relationship with the total optical length TTL of the zoom lens: 0.02≤Fw / TTL≤0.03; 0.49≤Ft / TTL≤0.52.

Images