Zoom lens and imaging device
By combining multiple zoom lens groups and cemented lenses, the problem of large size and poor image quality of medium-magnification zoom lenses has been solved, achieving a miniaturized and high-quality zoom lens design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIAXING ZHONGRUN OPTICAL TECH
- Filing Date
- 2022-10-27
- Publication Date
- 2026-05-29
AI Technical Summary
Existing medium-magnification zoom lenses are bulky, inconvenient to carry, and have limited image quality, making it difficult to achieve a large zoom range in a miniaturized manner.
The system employs a combination structure consisting of a fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture stop, a second zoom lens group with positive optical power, a focusing lens group with negative optical power, and a third zoom lens group with positive optical power. By setting multiple zoom lens groups and cemented lenses, specific optical parameter conditions are met, coma is reduced, and image quality is increased.
Achieving a large zoom range in a small size improves image quality and reduces cost and size.
Smart Images
Figure CN115793215B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optics, specifically to a zoom lens and an imaging device. Background Technology
[0002] Security lenses, also known as surveillance lenses, refer to the lenses of surveillance cameras. Since a surveillance camera is just a single video capture device, the pixels and resolution of its lenses are higher than those of a computer's video camera, but still cannot match those of a professional digital camera or DV.
[0003] With the booming development of the security industry, medium-magnification zoom lenses are favored by users due to their wide field of view. However, due to their high magnification, they require a large number of lenses and are also large in size, making them inconvenient to place and carry. They also have high requirements for applicable scenarios, causing a lot of inconvenience to customers. Summary of the Invention
[0004] This invention addresses existing technical problems by providing a zoom lens and imaging device. The zoom lens achieves a large zoom range within a small size, and by setting up multiple zoom lens groups, it reduces coma and increases the imaging quality of the zoom lens.
[0005] The technical solution provided by this invention is as follows:
[0006] A zoom lens, wherein the zoom lens comprises, from the object plane side to the image plane side, a fixed lens group with positive optical power, a first zoom lens group with negative optical power, an aperture stop, a second zoom lens group with positive optical power, a focusing lens group with negative optical power, and a third zoom lens group with positive optical power.
[0007] The fixed lens group consists of a first fixed lens with negative optical power, a second fixed lens with positive 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.
[0008] The first 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, sequentially from the object plane side to the image plane side.
[0009] The second zoom lens group consists of a fourth zoom lens with positive optical power, a fifth zoom lens with negative optical power, a sixth zoom lens with positive optical power, and a seventh zoom lens with negative optical power, from the object plane side to the image plane side. The fifth zoom lens, the sixth zoom lens, and the seventh zoom lens are cemented together.
[0010] The zoom lens satisfies the following condition:
[0011] TTL < 95mm;
[0012] ft / fw > 25;
[0013] Wherein, TTL is the total optical length of the zoom lens, ft is the focal length of the zoom lens in telephoto mode, and fw is the focal length of the zoom lens in wide-angle mode.
[0014] In this technical solution, by limiting the structure and parameters described above, the zoom lens can achieve a large zoom range with a small size. At the same time, by setting up multiple zoom lens groups, the coma of the zoom lens is reduced and the image quality of the zoom lens is increased.
[0015] Preferably, the third zoom lens group consists of an eighth zoom lens with positive optical power and a ninth zoom lens with negative optical power, sequentially from the object plane side to the image plane side.
[0016] The ninth zoom lens is a biconcave lens.
[0017] In this technical solution, the coma is reduced and the imaging quality of the zoom lens is increased by setting a biconcave lens close to the image plane.
[0018] Preferably, the focusing lens group is a lens with negative optical power.
[0019] In this technical solution, the focusing lens group is set as a single lens, which reduces the size of the zoom lens, realizes the miniaturization of the zoom lens, and also reduces the cost of the zoom lens.
[0020] Preferably, the third zoom lens group consists of an eighth zoom lens with positive optical power and a ninth zoom lens with positive optical power, sequentially from the object plane side to the image plane side.
[0021] In this technical solution, all of the third zoom lens group are set to positive optical power, which facilitates the processing of the third zoom lens group and increases the reliability of the zoom lens.
[0022] Preferably, the focusing lens group consists of a first focusing lens with negative positive optical power and a second focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side.
[0023] In this technical solution, by setting the cemented component of the focusing lens, the coma of the zoom lens is directly corrected at the front end of the third zoom lens group, thereby increasing the imaging quality of the zoom lens.
[0024] Preferably, the zoom lens satisfies the following condition:
[0025] fg4 / fw < -2;
[0026] Wherein, fg4 is the focal length of the focusing lens group.
[0027] In this technical solution, by limiting the above parameters, the moving distance of the focusing lens group is reduced, thereby achieving miniaturization of the zoom lens.
[0028] Preferably, the zoom lens satisfies the following condition:
[0029] fc2 / fw < -1;
[0030] Where fc2 is the focal length of the second focusing lens.
[0031] In this technical solution, by limiting the focal length of the second focusing lens, the coma of the remaining zoom lens group can be effectively corrected, thereby increasing the imaging quality of the zoom lens.
[0032] Preferably, the zoom lens satisfies the following condition:
[0033] S3 / S2 < 0.25;
[0034] S5 / S2 < 0.1;
[0035] S2 is the moving distance of the first zoom lens group, S3 is the moving distance of the second zoom lens group, and S5 is the moving distance of the third zoom lens group.
[0036] In this technical solution, by limiting the above parameters, the volume of the zoom lens group inside the zoom lens is reduced, thereby achieving miniaturization of the zoom lens.
[0037] Preferably, the zoom lens satisfies the following condition:
[0038] S4 / S2 < 0.25;
[0039] S4 is the moving distance of the focusing lens group.
[0040] In this technical solution, the focusing lens group can effectively correct the coma of the zoom lens when the moving distance of the focusing lens group is small, thus realizing the miniaturization of the zoom lens.
[0041] One of the objectives of this invention is to provide an imaging device, including a zoom lens and an imaging element configured to receive an image formed by the zoom lens.
[0042] Compared with the prior art, the zoom lens and imaging device provided by the present invention have the following beneficial effects:
[0043] 1. By limiting the structure and parameters mentioned above, the zoom lens can achieve a large zoom range in a small size. At the same time, by setting up multiple zoom lens groups, the coma of the zoom lens is reduced and the image quality of the zoom lens is increased.
[0044] 2. By setting the cemented component of the focusing lens, the coma of the zoom lens is directly corrected at the front end of the third zoom lens group, thereby increasing the image quality of the zoom lens.
[0045] 3. By limiting the focal length of the second focusing lens, the coma of the remaining zoom lens group can be effectively corrected, thereby increasing the image quality of the zoom lens.
[0046] 4. When the focusing lens group moves a small distance, it can effectively correct the coma of the zoom lens, thus realizing the miniaturization of the zoom lens. Attached Figure Description
[0047] 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.
[0048] Figure 1 This is a schematic diagram of the structure of a zoom lens in telephoto mode according to the present invention;
[0049] Figure 2 This is a schematic diagram of the structure of a zoom lens in a wide-angle state according to the present invention;
[0050] Figure 3 This invention provides a coma diagram of a zoom lens in telephoto mode.
[0051] Figure 4 This invention relates to a coma diagram of a zoom lens in a wide-angle state.
[0052] Figure 5 This is an aberration diagram of a zoom lens in telephoto mode according to the present invention;
[0053] Figure 6 This is an aberration diagram of a zoom lens in a wide-angle state according to the present invention;
[0054] Figure 7 This is a schematic diagram of another zoom lens telephoto configuration according to the present invention;
[0055] Figure 8 This is a schematic diagram of another zoom lens in a wide-angle state according to the present invention;
[0056] Figure 9 This is another coma diagram of the zoom lens in telephoto mode according to the present invention;
[0057] Figure 10 This is another coma diagram of the zoom lens in the wide-angle state according to the present invention;
[0058] Figure 11 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention;
[0059] Figure 12This is another aberration diagram of the zoom lens in the wide-angle state according to the present invention.
[0060] Explanation of reference numerals: G1, Fixed lens group; G2, First zoom lens group; G3, Second zoom lens group; G4, Focusing lens group; G5, Third zoom lens group; G6, Auxiliary component; a1, First fixed lens; a2, Second fixed lens; a3, Third fixed lens; a4, Fourth fixed lens; b1, First zoom lens; b2, Second zoom lens; b3, Third zoom lens; b4, Fourth zoom lens; b5, Fifth zoom lens; b6, Sixth zoom lens; b7, Seventh zoom lens; b8, Eighth zoom lens; b9, Ninth zoom lens; c1, First focusing lens; c2, Second focusing lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation
[0061] 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.
[0062] 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."
[0063] Example 1
[0064] like Figure 1 and Figure 7 As shown, a zoom lens is composed of, from the object plane side to the image plane side, a fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, an aperture stop STO, a second zoom lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, and a third zoom lens group G5 with positive optical power.
[0065] The fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with positive 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.
[0066] The first 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, from the object plane side to the image plane side.
[0067] The second zoom lens group G3 consists of a fourth zoom lens b4 with positive optical power, a fifth zoom lens b5 with negative optical power, a sixth zoom lens b6 with positive optical power, and a seventh zoom lens b7 with negative optical power, from the object plane side to the image plane side. The fifth zoom lens b5, the sixth zoom lens b6 and the seventh zoom lens b7 are cemented together.
[0068] The zoom lens satisfies the following condition:
[0069] TTL < 95mm;
[0070] ft / fw > 25;
[0071] Wherein, TTL is the total optical length of the zoom lens, ft is the focal length of the zoom lens in telephoto mode, and fw is the focal length of the zoom lens in wide-angle mode.
[0072] In this embodiment, by limiting the structure and parameters described above, the zoom lens can achieve a large zoom range with a small size. At the same time, by setting up multiple zoom lens groups, the coma of the zoom lens is reduced and the image quality of the zoom lens is increased.
[0073] The third zoom lens group G5 consists of an eighth zoom lens b8 with positive optical power and a ninth zoom lens b9 with negative optical power, sequentially from the object plane side to the image plane side.
[0074] The ninth zoom lens b9 is a biconcave lens.
[0075] In this embodiment, the coma is reduced and the imaging quality of the zoom lens is increased by setting a biconcave lens close to the image plane side.
[0076] The focusing lens group G4 is a lens with negative optical power.
[0077] By setting the focusing lens group G4 as a single lens, the size of the zoom lens is reduced, achieving miniaturization of the zoom lens and lowering its cost.
[0078] The third zoom lens group G5 consists of an eighth zoom lens b8 with positive optical power and a ninth zoom lens b9 with positive optical power, arranged sequentially from the object plane side to the image plane side.
[0079] Setting all three zoom lenses (G5) to positive optical power simplifies their manufacturing and increases the reliability of the zoom lens.
[0080] The focusing lens group G4 consists of a first focusing lens c1 with negative positive power and a second focusing lens c2 with negative optical power, arranged sequentially from the object plane side to the image plane side.
[0081] By setting the cemented component of the focusing lens group G4, the coma of the zoom lens is directly corrected at the front end of the third zoom lens group G5, thereby increasing the image quality of the zoom lens.
[0082] The zoom lens satisfies the following condition:
[0083] fg4 / fw < -2;
[0084] Wherein, fg4 is the focal length of the focusing lens group G4.
[0085] In this embodiment, by limiting the above parameters, the moving distance of the focusing lens group G4 is reduced, thereby achieving miniaturization of the zoom lens.
[0086] The zoom lens satisfies the following condition:
[0087] fc2 / fw < -1;
[0088] Where fc2 is the focal length of the second focusing lens c2.
[0089] By limiting the focal length of the second focusing lens c2, the coma of the remaining zoom lens group can be effectively corrected, thereby increasing the image quality of the zoom lens.
[0090] The zoom lens satisfies the following condition:
[0091] S3 / S2 < 0.25;
[0092] S5 / S2 < 0.1;
[0093] S2 is the moving distance of the first zoom lens group G2, S3 is the moving distance of the second zoom lens group G3, and S5 is the moving distance of the third zoom lens group G5.
[0094] By limiting the parameters mentioned above, the volume of the zoom lens group within the zoom lens is reduced, thus achieving miniaturization of the zoom lens.
[0095] The zoom lens satisfies the following condition:
[0096] S4 / S2 < 0.25;
[0097] S4 is the moving distance of the focusing lens group G4.
[0098] With a small moving distance of the focusing lens group G4, the focusing lens group G4 can effectively correct the coma of the zoom lens, thus realizing the miniaturization of the zoom lens.
[0099] Example 2
[0100] like Figures 1 to 6As shown, a zoom lens is composed of, from the object plane side to the image plane side, a fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, an aperture stop STO, a second zoom lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a third zoom lens group G5 with positive optical power, and an auxiliary component G6.
[0101] The fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with positive 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.
[0102] The first 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.
[0103] The second zoom lens group G3 consists of a fourth zoom lens b4 with positive optical power, a fifth zoom lens b5 with negative optical power, a sixth zoom lens b6 with positive optical power, and a seventh zoom lens b7 with negative optical power, from the object plane side to the image plane side. The fifth zoom lens b5, the sixth zoom lens b6, and the seventh zoom lens b7 are cemented together.
[0104] The third zoom lens group G5 consists of an eighth zoom lens b8 with positive optical power and a ninth zoom lens b9 with negative optical power, arranged sequentially from the object plane side to the image plane side.
[0105] The ninth zoom lens b9 is a biconcave lens.
[0106] The focusing lens group G4 is a second focusing lens c2 with negative optical power.
[0107] The auxiliary component G6 is a protective glass CG.
[0108] 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.
[0109] 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.
[0110] 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.
[0111] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .
[0112] Table 1
[0113]
[0114]
[0115] Table 2
[0116] WIDE TELE D1 0.72 30.26 D2 31.86 1.02 D3 0.8 5.22 D4 9.6 12.27 D5 8.4 2.61
[0117] Table 3
[0118]
[0119] In this embodiment, TTL = 90.51 mm, fw = 4.8 mm, ft = 144 mm, ft / fw = 30, and fno = 1.63-4.78;
[0120] Wherein, TTL is the total optical length of the zoom lens, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, and fno is the aperture number of the zoom lens.
[0121] fg4=-30.18mm, fg4 / fw=-6.29;
[0122] Wherein, fg4 is the focal length of the focusing lens group G4.
[0123] fc2=fg4=-30.18mm, fc2 / fw=-6.29;
[0124] Where fc2 is the focal length of the second focusing lens c2.
[0125] S2=29.54mm; S3=1.3mm, S4=3.12mm, S5=5.79mm;
[0126] S3 / S2 = 0.044;
[0127] S4 / S2 = 0.106;
[0128] S5 / S2 = 0.196;
[0129] S2 is the moving distance of the first zoom lens group G2, S3 is the moving distance of the second zoom lens group G3, S4 is the moving distance of the focusing lens group G4, and S5 is the moving distance of the third zoom lens group G5.
[0130] Example 3
[0131] like Figures 7 to 12 As shown, a zoom lens is composed of, from the object plane side to the image plane side, a fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, an aperture stop STO, a second zoom lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a third zoom lens group G5 with positive optical power, and an auxiliary component G6.
[0132] The fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with positive 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.
[0133] The first 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.
[0134] The second zoom lens group G3 consists of a fourth zoom lens b4 with positive optical power, a fifth zoom lens b5 with negative optical power, a sixth zoom lens b6 with positive optical power, and a seventh zoom lens b7 with negative optical power, from the object plane side to the image plane side. The fifth zoom lens b5, the sixth zoom lens b6, and the seventh zoom lens b7 are cemented together.
[0135] The third zoom lens group G5 consists of an eighth zoom lens b8 with positive optical power and a ninth zoom lens b9 with positive optical power, arranged sequentially from the object plane side to the image plane side.
[0136] The focusing lens group G4 consists of a first focusing lens c1 with negative positive power and a second focusing lens c2 with negative optical power, arranged sequentially from the object plane side to the image plane side.
[0137] The auxiliary component G6 is a protective glass CG.
[0138] 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.
[0139] 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.
[0140] 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.
[0141] In Table 6, K is the conic coefficient, and e is the scientific notation, for example, e-005 represents 10. -5 .
[0142] Table 4
[0143]
[0144]
[0145] Table 5
[0146] WIDE TELE D1 1.08 28.84 D2 27.86 0.1 D3 8.36 2.3 D4 0.71 0.78 D5 4.54 13.17 D6 5.24 2.6
[0147] Table 6
[0148]
[0149]
[0150] In this embodiment, TTL = 90.5mm, fw = 4.8mm, ft = 144mm, ft / fw = 30, and fno = 1.61-4.84;
[0151] Wherein, TTL is the total optical length of the zoom lens, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, and fno is the aperture number of the zoom lens.
[0152] fg4=-10.76mm, fg4 / fw=-2.24;
[0153] Wherein, fg4 is the focal length of the focusing lens group G4.
[0154] fc2=-5.12mm, fc2 / fw=-1.07;
[0155] Where fc2 is the focal length of the second focusing lens c2.
[0156] S2=27.76mm; S3=6.06mm, S4=5.99mm, S5=2.64mm;
[0157] S3 / S2 = 0.218;
[0158] S4 / S2 = 0.216;
[0159] S5 / S2 = 0.095;
[0160] S2 is the moving distance of the first zoom lens group G2, S3 is the moving distance of the second zoom lens group G3, S4 is the moving distance of the focusing lens group G4, and S5 is the moving distance of the third zoom lens group G5.
[0161] Example 4
[0162] like Figures 1 to 12 As shown, an imaging device 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.
[0163] 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, from the object plane side to the image plane side, a fixed lens group with positive optical power, a first zoom lens group with negative optical power, an aperture stop, a second zoom lens group with positive optical power, a focusing lens group with negative optical power, and a third zoom lens group with positive optical power. The fixed lens group consists of a first fixed lens with negative optical power, a second fixed lens with positive 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 first 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, sequentially from the object plane side to the image plane side. The second zoom lens group consists of a fourth zoom lens with positive optical power, a fifth zoom lens with negative optical power, a sixth zoom lens with positive optical power, and a seventh zoom lens with negative optical power, from the object plane side to the image plane side. The fifth zoom lens, the sixth zoom lens, and the seventh zoom lens are cemented together. The zoom lens satisfies the following condition: TTL < 95mm; ft / fw > 25; Wherein, TTL is the total optical length of the zoom lens, ft is the focal length of the zoom lens in telephoto mode, and fw is the focal length of the zoom lens in wide-angle mode.
2. A zoom lens according to claim 1, characterized in that: The third zoom lens group consists of an eighth zoom lens with positive optical power and a ninth zoom lens with negative optical power, sequentially from the object plane side to the image plane side. The ninth zoom lens is a biconcave lens.
3. A zoom lens according to claim 2, characterized in that: The focusing lens group is a lens with negative optical power.
4. A zoom lens according to claim 1, characterized in that: The third zoom lens group consists of an eighth zoom lens with positive optical power and a ninth zoom lens with positive optical power, sequentially from the object plane side to the image plane side.
5. A zoom lens according to claim 4, characterized in that: The focusing lens group consists of a first focusing lens with positive optical power and a second focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side.
6. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: fg4 / fw < -2; Wherein, fg4 is the focal length of the focusing lens group.
7. A zoom lens according to claim 5, characterized in that: The zoom lens satisfies the following condition: fc2 / fw < -1; Where fc2 is the focal length of the second focusing lens.
8. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: S3 / S2 < 0.25; S5 / S2 < 0.1; S2 is the moving distance of the first zoom lens group, S3 is the moving distance of the second zoom lens group, and S5 is the moving distance of the third zoom lens group.
9. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: S4 / S2 < 0.25; S4 is the moving distance of the focusing 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.