Zoom lens and imaging device

Abstract

This invention relates to the field of optics, specifically to a zoom lens and imaging device. The zoom lens, from the object plane side to the image plane side, consists of a first fixed lens group with positive optical power, a zoom lens group, an aperture stop, a second fixed lens group, a focusing lens group, and an auxiliary lens group. The zoom lens group and the focusing lens group move along the principal optical axis of the zoom lens. The first fixed lens group, from the object plane side to the image plane side, consists of a first fixed lens with negative optical power, a second fixed lens with negative optical power, a third fixed lens with positive optical power, and a fourth fixed lens with positive optical power. The zoom lens satisfies the following conditions: XG2 / ft > 0.5; ft / fw < 5; DG12max / DG35 > 1.8. This invention achieves a zoom lens that, while miniaturizing, improves the volume of the front lens group and the range of motion of the zoom lens group to a certain extent, increasing the zoom capability and resolving power of the zoom lens.

Description

Technical Field

[0001] This invention relates to the field of optics, specifically to a zoom lens and an imaging device. Background Technology

[0002] A zoom lens is a camera lens that can change its focal length within a certain range, thereby obtaining different widths of field of view, different image sizes, and different ranges of scenery. A zoom lens can change the shooting range by changing the focal length without changing the shooting distance, which is very beneficial for image composition. Since a zoom lens can perform the function of several prime lenses, it not only reduces the amount of photography equipment needed when traveling but also saves time changing lenses.

[0003] To make zoom lenses more user-friendly, everyday zoom lenses are trending towards smaller sizes. However, how to further increase the zoom range and improve the clarity of zoom lenses while making them smaller is a problem that industry professionals urgently need to solve. Summary of the Invention

[0004] This invention addresses existing technical problems by providing a zoom lens and imaging device that, while miniaturizing the zoom lens, increases the volume of the front element and the range of motion of the zoom lens group, thereby enhancing the zoom capability and resolution of the zoom lens.

[0005] The technical solution provided by this invention is as follows:

[0006] A zoom lens, wherein the zoom lens is composed of a first fixed lens group with positive optical power, a zoom lens group, an aperture stop, a second fixed lens group, a focusing lens group, and an auxiliary lens group from the object plane side to the image plane side.

[0007] The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens;

[0008] The first fixed lens group consists of a first fixed lens with negative optical power, a second fixed lens with negative optical power, a third fixed lens with positive optical power, and a fourth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side. The zoom lens satisfies the following conditions: XG2 / ft > 0.5; ft / fw < 5; DG12max / DG35 > 1.8; where XG2 is the maximum moving distance of the zoom lens group, fw is the focal length of the zoom lens in wide-angle mode, ft is the focal length of the zoom lens in telephoto mode, DG12max is the maximum total optical length of the first fixed lens group and the zoom lens group, and DG35 is the maximum total optical length of the second fixed lens group to the auxiliary lens group.

[0009] In this technical solution, by limiting the structure and parameters mentioned above, the zoom lens is miniaturized while increasing the volume of the front group and the range of motion of the zoom lens group to a certain extent, thereby increasing the zoom capability and resolution of the zoom lens.

[0010] Preferably, each of the first fixed lens group, the zoom lens group, the second fixed lens group, and the focusing lens group includes at least one aspherical lens.

[0011] In this technical solution, the use of aspherical lenses greatly reduces the number of lenses inside the zoom lens, thereby reducing the size of the zoom lens and achieving miniaturization.

[0012] Preferably, both the second fixed lens and the third fixed lens are aspherical lenses.

[0013] In this technical solution, optical correction is quickly achieved by setting two consecutive aspherical lenses, reducing the use of lenses and reducing the vertical spacing of the subsequent optical path, thereby reducing the diameter of the zoom lens and achieving horizontal miniaturization of the zoom lens.

[0014] Preferably, the zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens with negative optical power, and a third zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0015] Preferably, the zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens with negative optical power, a third zoom lens with positive optical power, and a fourth zoom lens with negative optical power, arranged sequentially from the object plane side to the image plane side, wherein the third zoom lens and the fourth zoom lens are cemented together.

[0016] Preferably, the second fixed lens group consists of a fifth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, and an eighth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0017] Preferably, the focusing lens group is a first focusing lens with negative optical power;

[0018] The auxiliary lens group is a first auxiliary lens with positive optical power.

[0019] Preferably, the surface of the fourth zoom lens facing the image plane is a plane.

[0020] In this technical solution, the plane limitation facilitates the adjustment of the optical path and also facilitates the processing of the fourth zoom lens.

[0021] Preferably, the surface of the first auxiliary lens facing the image plane is a plane.

[0022] In this technical solution, the plane limitation facilitates the adjustment of the optical path and also facilitates the processing of the first auxiliary lens.

[0023] Preferably, the zoom lens satisfies the following condition:

[0024] 0.1 < XG4 / XG2 < 0.25;

[0025] Wherein, XG4 is the maximum moving distance of the focusing lens group.

[0026] In this technical solution, by setting a focusing lens group at an appropriate distance, the zoom lens is miniaturized while achieving accurate focusing, thus increasing the resolution of the zoom lens.

[0027] Preferably, the zoom lens satisfies the following condition:

[0028] 0.3 < ΦG3 / ΦG1 < 0.4;

[0029] Wherein, ΦG3 is the maximum outer diameter of the second fixed lens group, and ΦG1 is the maximum outer diameter of the first fixed lens group.

[0030] In this technical solution, the zoom lens is miniaturized by limiting its outer diameter, while the field of view of the zoom lens is increased.

[0031] One of the objects of the present invention is to provide an imaging apparatus, comprising: a zoom lens; and an imaging element configured to receive an image formed by the zoom lens.

[0032] Compared with the prior art, the zoom lens and imaging device provided by the present invention have the following beneficial effects:

[0033] 1. By limiting the structure and parameters described above, the zoom lens is miniaturized while increasing the volume of the front group and the range of motion of the zoom lens group to a certain extent, thereby increasing the zoom capability and resolution of the zoom lens.

[0034] 2. By using two consecutive aspherical lenses, optical correction is quickly achieved, reducing the number of lenses used. At the same time, the distance between the upper and lower light rays in the subsequent optical path is reduced, thus reducing the diameter of the zoom lens and achieving lateral miniaturization of the zoom lens.

[0035] 3. By setting a focusing lens group at an appropriate distance, the zoom lens is miniaturized while achieving accurate focusing, thus increasing its resolving power. Attached Figure Description

[0036] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of a zoom lens and imaging device.

[0037] Figure 1 This is a schematic diagram of the structure of a zoom lens according to the present invention;

[0038] Figure 2 This is an aberration diagram of a zoom lens in a wide-angle state according to the present invention;

[0039] Figure 3 This is an aberration diagram of a zoom lens in telephoto mode according to the present invention;

[0040] Figure 4 This invention provides a first coma diagram of a zoom lens in a wide-angle state.

[0041] Figure 5 This invention provides a second coma diagram of a zoom lens in a wide-angle state.

[0042] Figure 6 This is a first coma diagram of a zoom lens in telephoto mode according to the present invention;

[0043] Figure 7 This is a second coma diagram of a zoom lens in telephoto mode according to the present invention;

[0044] Figure 8 This is a schematic diagram of another zoom lens according to the present invention;

[0045] Figure 9 This is another aberration diagram of the zoom lens in the wide-angle state according to the present invention;

[0046] Figure 10 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention;

[0047] Figure 11 This is a first coma diagram of another zoom lens in a wide-angle state according to the present invention;

[0048] Figure 12 This is a second coma diagram of another zoom lens in a wide-angle state according to the present invention;

[0049] Figure 13 This is a first coma diagram of another zoom lens telephoto state according to the present invention;

[0050] Figure 14 This is a second coma diagram of another zoom lens telephoto state according to the present invention.

[0051] Explanation of reference numerals: G1, First fixed lens group; G2, Zoom lens group; G3, Second fixed lens group; G4, Focusing lens group; G5, Auxiliary lens group; G6, Auxiliary component; a1, First fixed lens; a2, Second fixed lens; a3, Third fixed lens; a4, Fourth fixed lens; a5, Fifth fixed lens; a6, Sixth fixed lens; a7, Seventh fixed lens; a8, Eighth fixed lens; b1, First zoom lens; b2, Second zoom lens; b3, Third zoom lens; b4, Fourth zoom lens; c1, First focusing lens; d1, First auxiliary lens; STO, Aperture stop; CG1, First protective glass; CG2, Second protective glass. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0054] Example 1

[0055] like Figure 1 As shown, a zoom lens is composed of a first fixed lens group G1 with positive optical power, a zoom lens group G2, an aperture stop STO, a second fixed lens group G3, a focusing lens group G4, and an auxiliary lens group G5, arranged sequentially from the object plane side to the image plane side.

[0056] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the zoom lens.

[0057] The first fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with negative optical power, a third fixed lens a3 with positive optical power, and a fourth fixed lens a4 with positive optical power, from the object plane side to the image plane side.

[0058] The zoom lens satisfies the following condition:

[0059] XG2 / ft > 0.5;

[0060] ft / fw < 5;

[0061] DG12max / DG35 > 1.8;

[0062] Wherein, XG2 is the maximum moving distance of the zoom lens group G2, fw is the focal length of the zoom lens in wide-angle mode, ft is the focal length of the zoom lens in telephoto mode, DG12max is the maximum total optical length of the first fixed lens group G1 and the zoom lens group G2, and DG35 is the maximum total optical length of the second fixed lens group G3 to the auxiliary lens group G5.

[0063] In this embodiment, by limiting the structure and parameters described above, the zoom lens is miniaturized while increasing the volume of the front group and the range of motion of the zoom lens group to a certain extent, thereby increasing the zoom capability and resolution of the zoom lens.

[0064] Each of the first fixed lens group G1, the zoom lens group G2, the second fixed lens group G3, and the focusing lens group G4 contains at least one aspherical lens.

[0065] By using aspherical lenses, the number of lenses inside the zoom lens is greatly reduced, thereby reducing the size of the zoom lens and achieving miniaturization.

[0066] Both the second fixed lens a2 and the third fixed lens a3 are aspherical lenses.

[0067] In this embodiment, optical correction is quickly achieved by setting two consecutive aspherical lenses, reducing the use of lenses and reducing the vertical light distance in the subsequent optical path, thereby reducing the diameter of the zoom lens and achieving horizontal miniaturization of the zoom lens.

[0068] The zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, and a third zoom lens b3 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0069] The zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with positive optical power, and a fourth zoom lens b4 with negative optical power, arranged sequentially from the object plane side to the image plane side. The third zoom lens b3 and the fourth zoom lens b4 are cemented together.

[0070] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with positive optical power, a seventh fixed lens a7 with negative optical power, and an eighth fixed lens a8 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0071] The focusing lens group G4 is a first focusing lens c1 with negative optical power;

[0072] The auxiliary lens group G5 is a first auxiliary lens d1 with positive optical power.

[0073] The surface of the fourth zoom lens b4 facing the image plane is a plane.

[0074] In this embodiment, the plane definition facilitates the adjustment of the optical path and also facilitates the fabrication of the fourth zoom lens b4.

[0075] The surface of the first auxiliary lens d1 facing the image plane is a plane.

[0076] In this embodiment, the plane definition facilitates the adjustment of the optical path and also facilitates the fabrication of the first auxiliary lens d1.

[0077] The zoom lens satisfies the following condition:

[0078] 0.1 < XG4 / XG2 < 0.25;

[0079] Wherein, XG4 is the maximum moving distance of the focusing lens group G4.

[0080] By setting the focusing lens group G4 at an appropriate distance, the zoom lens achieves accurate focusing while miniaturizing, thus increasing its resolving power.

[0081] The zoom lens satisfies the following condition:

[0082] 0.3 < ΦG3 / ΦG1 < 0.4;

[0083] Wherein, ΦG3 is the maximum outer diameter of the second fixed lens group G3, and ΦG1 is the maximum outer diameter of the first fixed lens group G1.

[0084] By limiting the outer diameter, the zoom lens was miniaturized while increasing its field of view.

[0085] Example 2

[0086] like Figures 1 to 7 As shown, a zoom lens is composed of, from the object plane side to the image plane side, a first fixed lens group G1 with positive optical power, a zoom lens group G2, an aperture stop STO, a second fixed lens group G3, a focusing lens group G4, an auxiliary lens group G5, and an auxiliary component G6.

[0087] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the zoom lens.

[0088] The first fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with negative optical power, a third fixed lens a3 with positive optical power, and a fourth fixed lens a4 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0089] The zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, and a third zoom lens b3 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0090] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with positive optical power, a seventh fixed lens a7 with negative optical power, and an eighth fixed lens a8 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0091] The focusing lens group G4 is a first focusing lens c1 with negative optical power;

[0092] The auxiliary lens group G5 is a first auxiliary lens d1 with positive optical power.

[0093] The auxiliary component G6 consists of a first protective glass CG1 and a second protective glass CG2, arranged sequentially from the object plane side to the image plane side.

[0094] The basic lens data of the zoom lens in this embodiment is shown in Table 1, the variable parameters in Table 1 are shown in Table 2, and the aspherical coefficients are shown in Table 3.

[0095] The surface number column shows the surface number when the object-side surface is set as surface 1 and the numbering is increased sequentially towards the image side; the surface type column shows the surface type of a lens; the radius of curvature column shows the radius of curvature of a lens, where a positive radius of curvature indicates that the surface is curved towards the object side and a negative radius of curvature indicates that the surface is curved towards the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a lens; and the Abbe number column shows the Abbe number of a lens.

[0096] In Table 2, the WIDE column indicates the specific values ​​of each variable parameter when the zoom lens is in wide-angle mode, and the TELE column indicates the specific values ​​of each variable parameter when the zoom lens is in telephoto mode.

[0097] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0098] Table 1

[0099] Face number Surface type radius of curvature / mm Center thickness / mm Refractive index Abbe number OBJ S1 spherical -98.661 0.90 1.85 23.78 S2 spherical 104.754 1.00 S3 aspherical -15.109 1.92 1.64 23.92 S4 aspherical -22.464 2.95 S5 aspherical 42.776 3.42 1.54 55.65 S6 aspherical -63.292 0.10 S7 spherical 17.554 4.00 1.59 68.63 S8 spherical -66.188 D1 S9 spherical -43.088 0.50 1.80 46.5 S10 spherical 6.079 1.89 S11 aspherical -14.283 0.70 1.54 55.65 S12 aspherical 14.442 0.21 S13 spherical 68.872 1.45 1.85 23.78 S14 spherical -16.483 D2 STO spherical INF 0.10 S16 aspherical 17.539 1.38 1.54 55.65 S17 aspherical -26.192 0.76 S18 spherical 224.935 2.59 1.59 68.63 S19 spherical -10.847 3.44 S20 spherical 15.34 0.50 1.85 23.78 S21 spherical 6.429 1.98 1.59 68.63 S22 spherical -30.798 D3 S23 aspherical -4.271 0.68 1.64 23.92 S24 aspherical -10.34 D4 S25 spherical 11.297 1.48 1.73 54.67 S26 spherical INF 2.47 S27 spherical INF 0.30 1.52 64.21 S28 spherical INF 0.80 S29 spherical INF 0.50 1.52 64.21 S30 spherical INF 0.43 IMG

[0100] Table 2

[0101]

[0102]

[0103] Table 3

[0104]

[0105] In this embodiment, fw = 4.6 mm, ft = 22 mm, ft / fw = 4.78, fno = 1.9, and TTL = 53.7 mm;

[0106] Wherein, fw is the focal length of the zoom lens in wide-angle mode, ft is the focal length of the zoom lens in telephoto mode, fno is the aperture number of the zoom lens, and TTL is the total optical length of the zoom lens.

[0107] DG12max=31.72mm; DG35=16.83mm;

[0108] DG12max / DG35 = 1.88;

[0109] Wherein, DG12max is the maximum total optical length of the first fixed lens group G1 and the zoom lens group G2, and DG35 is the maximum total optical length of the second fixed lens group G3 to the auxiliary lens group G5.

[0110] XG2=12.03mm, XG2 / ft=0.547;

[0111] XG4=1.55mm, XG4 / XG2=0.129;

[0112] XG2 is the maximum moving distance of the zoom lens group G2, and XG4 is the maximum moving distance of the focusing lens group G4.

[0113] ΦG3=8.62mm, ΦG1=24.92mm, ΦG3 / ΦG1=0.346;

[0114] Wherein, ΦG3 is the maximum outer diameter of the second fixed lens group G3, and ΦG1 is the maximum outer diameter of the first fixed lens group G1.

[0115] Example 3

[0116] like Figures 8 to 14 As shown, a zoom lens is composed of, from the object plane side to the image plane side, a first fixed lens group G1 with positive optical power, a zoom lens group G2, an aperture stop STO, a second fixed lens group G3, a focusing lens group G4, an auxiliary lens group G5, and an auxiliary component G6.

[0117] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the zoom lens.

[0118] The first fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with negative optical power, a third fixed lens a3 with positive optical power, and a fourth fixed lens a4 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0119] The zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with positive optical power, and a fourth zoom lens b4 with negative optical power, arranged sequentially from the object plane side to the image plane side. The third zoom lens b3 and the fourth zoom lens b4 are cemented together.

[0120] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with positive optical power, a seventh fixed lens a7 with negative optical power, and an eighth fixed lens a8 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0121] The focusing lens group G4 is a first focusing lens c1 with negative optical power;

[0122] The auxiliary lens group G5 is a first auxiliary lens d1 with positive optical power.

[0123] The auxiliary component G6 consists of a first protective glass CG1 and a second protective glass CG2, arranged sequentially from the object plane side to the image plane side.

[0124] The basic lens data of the zoom lens in this embodiment is shown in Table 4, the variable parameters in Table 4 are shown in Table 5, and the aspherical coefficients are shown in Table 6.

[0125] The surface number column shows the surface number when the object-side surface is set as surface 1 and the numbering is increased sequentially towards the image side; the surface type column shows the surface type of a lens; the radius of curvature column shows the radius of curvature of a lens, where a positive radius of curvature indicates that the surface is curved towards the object side and a negative radius of curvature indicates that the surface is curved towards the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a lens; and the Abbe number column shows the Abbe number of a lens.

[0126] In Table 5, the WIDE column indicates the specific values ​​of each variable parameter when the zoom lens is in the wide-angle position, and the TELE column indicates the specific values ​​of each variable parameter when the zoom lens is in the telephoto position.

[0127] In Table 6, K is the conic coefficient, and e is the scientific notation, for example, e-005 represents 10. -5 .

[0128] Table 4

[0129]

[0130]

[0131] Table 5

[0132] WIDE TELE D1 0.65 12.43 D2 12.33 0.55 D3 0.94 3.48 D4 3.58 1.04

[0133] Table 6

[0134]

[0135] In this embodiment, fw = 4.6 mm, ft = 21 mm, ft / fw = 4.57, fno = 1.9, and TTL = 53.31 mm;

[0136] Wherein, fw is the focal length of the zoom lens in wide-angle mode, ft is the focal length of the zoom lens in telephoto mode, fno is the aperture number of the zoom lens, and TTL is the total optical length of the zoom lens.

[0137] DG12max=31.57mm; DG35=16.99mm;

[0138] DG12max / DG35 = 1.86;

[0139] Wherein, DG12max is the maximum total optical length of the first fixed lens group G1 and the zoom lens group G2, and DG35 is the maximum total optical length of the second fixed lens group G3 to the auxiliary lens group G5.

[0140] XG2=11.78mm, XG2 / ft=0.561;

[0141] XG4=2.54mm, XG4 / XG2=0.216;

[0142] XG2 is the maximum moving distance of the zoom lens group G2, and XG4 is the maximum moving distance of the focusing lens group G4.

[0143] ΦG3=8.35mm, ΦG1=24.12mm, ΦG3 / ΦG1=0.346;

[0144] Wherein, ΦG3 is the maximum outer diameter of the second fixed lens group G3, and ΦG1 is the maximum outer diameter of the first fixed lens group G1.

[0145] Example 4

[0146] An imaging device, such as Figures 1 to 14As shown, it includes: a zoom lens as described in any of the above embodiments, and an imaging element configured to receive an image formed by the zoom lens.

[0147] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A zoom lens, characterized in that, The zoom lens consists of a first fixed lens group with positive optical power, a zoom lens group, an aperture stop, a second fixed lens group, a focusing lens group, and an auxiliary lens group, arranged sequentially from the object plane side to the image plane side. The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens; The first fixed lens group consists of a first fixed lens with negative optical power, a second fixed lens with negative optical power, a third fixed lens with positive optical power, and a fourth fixed lens with positive optical power, from the object plane side to the image plane side. The second fixed lens group consists of a fifth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, and an eighth fixed lens with positive optical power, sequentially from the object plane side to the image plane side. The focusing lens group is a first focusing lens with negative optical power; The auxiliary lens group is a first auxiliary lens with positive optical power; The zoom lens satisfies the following condition: XG2 / ft > 0.5; ft / fw < 5; DG12max / DG35 > 1.8; Wherein, XG2 is the maximum moving distance of the zoom lens group, fw is the focal length of the zoom lens in wide-angle mode, ft is the focal length of the zoom lens in telephoto mode, DG12max is the maximum total optical length of the first fixed lens group and the zoom lens group, and DG35 is the maximum total optical length of the second fixed lens group to the auxiliary lens group.

2. A zoom lens according to claim 1, characterized in that: Each of the first fixed lens group, the zoom lens group, the second fixed lens group, and the focusing lens group contains at least one aspherical lens.

3. A zoom lens according to claim 1, characterized in that: Both the second fixed lens and the third fixed lens are aspherical lenses.

4. A zoom lens according to claim 1, characterized in that: The zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens with negative optical power, and a third zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

5. A zoom lens according to claim 1, characterized in that: The zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens with negative optical power, a third zoom lens with positive optical power, and a fourth zoom lens with negative optical power, arranged sequentially from the object plane side to the image plane side. The third zoom lens and the fourth zoom lens are cemented together.

6. A zoom lens according to claim 5, characterized in that: The surface of the fourth zoom lens facing the image plane is a plane.

7. A zoom lens according to claim 1, characterized in that: The surface of the first auxiliary lens facing the image plane is a plane.

8. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 0.1 < XG4 / XG2 < 0.25; Wherein, XG4 is the maximum moving distance of the focusing lens group.

9. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 0.3 < ΦG3 / ΦG1 < 0.4; Wherein, ΦG3 is the maximum outer diameter of the second fixed lens group, and ΦG1 is the maximum outer diameter of the first fixed lens group.

10. An imaging device, characterized in that, include: The zoom lens as described in any one of claims 1 to 9; And an imaging element, configured to receive an image formed by the zoom lens.

Images