Zoom lens and imaging device

Abstract

The invention relates to the field of optics, in particular to a zoom lens which is sequentially composed of a fixed lens group with positive focal power, a first zoom lens group with negative focal power, a second zoom lens group with positive focal power, a focusing lens group with negative focal power and a third zoom lens group with positive focal power from the object plane side to the image plane side. The zoom lens satisfies the following conditional expressions: ft / fw > 15; 3 < XG2 / fw < 7; wherein ft is the focal length of the zoom lens in a telescopic state, fw is the focal length of the zoom lens in a wide-angle state, and XG2 is the maximum moving distance of the first zoom lens group. According to the zoom lens provided by the invention, the size of the zoom lens can be reduced on the basis of realizing a medium-magnification zoom lens through an optical architecture of a five-group structure and four-group linkage, and meanwhile, the possibility that the size of the zoom lens is too large is further reduced through the limitation of the maximum moving distance of the first zoom lens group, so that the miniaturization of the zoom lens is realized.

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 lens that can change its focal length within a certain range to obtain different widths of field of view, different sizes of images, and different ranges of objects. 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.

[0003] Currently, existing medium-magnification zoom lenses typically need to balance performance in both wide-angle and telephoto modes. Therefore, during the zoom process, changes in the optical path and the effects of coma must be considered. To improve the image quality of zoom lenses, the number of lenses inside the zoom lens can only be increased, which in turn leads to an excessively large zoom lens size. Summary of the Invention

[0004] This invention addresses existing technical problems by providing a zoom lens and imaging device. Through a five-group structure with four groups linked in an optical architecture, it achieves a medium-magnification zoom lens while reducing the size of the zoom lens. Furthermore, by limiting the maximum moving distance of the first zoom lens group, it further reduces the possibility of an excessively large zoom lens, thus achieving miniaturization 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, 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 first zoom lens group, the second zoom lens group, the focusing lens group, and the third zoom lens group move along the principal optical axis of the zoom lens;

[0008] The fixed lens group consists of a first fixed lens with positive 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 second fixed lens and the third fixed lens are cemented together.

[0009] The focusing lens group consists of a first focusing lens with negative optical power and a second focusing lens with positive optical power, arranged sequentially from the object plane side to the image plane side, and the first focusing lens and the second focusing lens are cemented together.

[0010] The zoom lens satisfies the following condition:

[0011] ft / fw > 15;

[0012] 3 < XG2 / fw < 5;

[0013] Wherein, 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 XG2 is the maximum moving distance of the first zoom lens group.

[0014] In this technical solution, an optical architecture with a five-group structure and four-group linkage is used to achieve a medium-magnification zoom lens while reducing the size of the zoom lens. At the same time, by limiting the maximum moving distance of the first zoom lens group, the possibility of the zoom lens being too large is further reduced, thus realizing the miniaturization of the zoom lens.

[0015] Preferably, the second zoom lens group consists of a sixth zoom lens with positive optical power, a seventh zoom lens with negative optical power, an eighth zoom lens with positive optical power, a ninth zoom lens with negative optical power, a tenth zoom lens with negative optical power, and an eleventh zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side; wherein the seventh zoom lens, the eighth zoom lens, and the ninth zoom lens constitute a cemented triplet lens.

[0016] Preferably, the first zoom lens group consists of, from the object plane side to the image plane side, a first zoom lens with negative optical power, a second fixed lens with negative optical power, a third zoom lens with negative optical power, a fourth zoom lens with positive optical power, and a fifth zoom lens with negative optical power; the fourth and fifth zoom lenses are cemented together. The third zoom lens is a fourteenth zoom lens with positive optical power.

[0017] Preferably, the first zoom lens group consists of a first zoom lens with negative optical power, a third zoom lens with negative optical power, a fourth zoom lens with positive optical power, and a fifth 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. The third zoom lens consists of a twelfth zoom lens with positive optical power, a thirteenth zoom lens with negative optical power, and a fourteenth zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0018] Preferably, the zoom lens satisfies the following condition:

[0019] -2 < fG2 / fw < -1;

[0020] Where fG2 is the focal length of the first zoom lens group.

[0021] In this technical solution, the optical path of the zoom lens is optimized by limiting the first zoom lens group, reducing the light dissipation of the first zoom lens group when receiving light from the fixed lens group, and increasing the brightness of the zoom lens image.

[0022] Preferably, the zoom lens satisfies the following condition:

[0023] 2 < fG5 / fw < 3;

[0024] Wherein, fG5 is the focal length of the third zoom lens group.

[0025] In this technical solution, by limiting the focal length of the third zoom lens group, the coma and aberrations generated by the first zoom lens group during movement are reduced, thereby increasing the imaging quality of the zoom lens.

[0026] Preferably, the zoom lens satisfies the following condition:

[0027] XG4 / XG2 < 0.25;

[0028] Wherein, XG4 is the maximum moving distance of the focusing lens group.

[0029] In this technical solution, by limiting the maximum moving distance of the focusing lens group, the moving range of the focusing lens group is reduced while improving the imaging quality of the zoom lens, thus achieving miniaturization of the zoom lens.

[0030] Preferably, the zoom lens satisfies the following condition:

[0031] XG5 / XG2 < 0.1;

[0032] Wherein, XG5 is the maximum moving distance of the third zoom lens group.

[0033] In this technical solution, while miniaturizing the zoom lens, the optical path of the zoom lens is optimized, thereby increasing the imaging quality of the zoom lens.

[0034] One of the objectives of this invention is to provide an imaging device, comprising: a zoom lens; and an imaging element configured to receive an image formed by the zoom lens.

[0035] Compared with the prior art, the zoom lens and imaging device provided by the present invention have the following beneficial effects:

[0036] 1. By using a five-group structure with four groups linked together, a medium-magnification zoom lens can be achieved while reducing the size of the zoom lens. At the same time, by limiting the maximum moving distance of the first zoom lens group, the possibility of the zoom lens being too large is further reduced, thus realizing the miniaturization of the zoom lens.

[0037] 2. By limiting the first zoom lens group, the optical path of the zoom lens is optimized, the light dissipation of the first zoom lens group when receiving light from the fixed lens group is reduced, and the brightness of the zoom lens image is increased.

[0038] 3. By limiting the maximum moving distance of the focusing lens group, the moving range of the focusing lens group is reduced while improving the imaging quality of the zoom lens, thus achieving miniaturization of the zoom lens. Attached Figure Description

[0039] 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.

[0040] Figure 1 This is a schematic diagram of the structure of a zoom lens according to the present invention;

[0041] Figure 2 This is an aberration diagram of a zoom lens in a wide-angle state according to the present invention;

[0042] Figure 3 This invention relates to a coma diagram of a zoom lens in a wide-angle state.

[0043] Figure 4 This is an aberration diagram of a zoom lens in telephoto mode according to the present invention;

[0044] Figure 5 This invention provides a coma diagram of a zoom lens in telephoto mode.

[0045] Figure 6 This is a schematic diagram of another zoom lens according to the present invention;

[0046] Figure 7 This is another aberration diagram of the zoom lens in the wide-angle state according to the present invention;

[0047] Figure 8 This is another coma diagram of the zoom lens in the wide-angle state according to the present invention;

[0048] Figure 9 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention;

[0049] Figure 10 This is another coma diagram of the zoom lens in the telephoto state according to the present invention.

[0050] 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; b10, Tenth zoom lens; b11, Eleventh zoom lens; b12, Twelfth zoom lens; b13, Thirteenth zoom lens; b14, Fourteenth zoom lens; c1, First focusing lens; c2, Second focusing lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation

[0051] 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.

[0052] 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."

[0053] Example 1

[0054] like Figure 1 and Figure 6 As shown, a zoom lens is composed of a fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, 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, arranged sequentially from the object plane side to the image plane side.

[0055] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, and the third zoom lens group G5 move along the principal optical axis of the zoom lens;

[0056] The fixed lens group G1 consists of a first fixed lens a1 with positive 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; the second fixed lens a2 and the third fixed lens a3 are cemented together.

[0057] The focusing lens group G4 consists of a first focusing lens c1 with negative optical power and a second focusing lens c2 with positive optical power, arranged sequentially from the object plane side to the image plane side. The first focusing lens c1 and the second focusing lens c2 are cemented together.

[0058] The zoom lens satisfies the following condition:

[0059] ft / fw > 15;

[0060] 3 < XG2 / fw < 5;

[0061] Wherein, 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 XG2 is the maximum moving distance of the first zoom lens group G2.

[0062] In this embodiment, by using an optical architecture with a five-group structure and four-group linkage, a medium-magnification zoom lens is achieved, while also reducing the size of the zoom lens. At the same time, by limiting the maximum moving distance of the first zoom lens group G2, the possibility of the zoom lens being too large is further reduced, thus achieving miniaturization of the zoom lens.

[0063] The second zoom lens group G3 consists of, from the object plane side to the image plane side, a sixth zoom lens b6 with positive optical power, a seventh zoom lens b7 with negative optical power, an eighth zoom lens b8 with positive optical power, a ninth zoom lens b9 with negative optical power, a tenth zoom lens b10 with negative optical power, and an eleventh zoom lens b11 with positive optical power; wherein, the seventh zoom lens b7, the eighth zoom lens b8, and the ninth zoom lens b9 form a cemented triplet lens.

[0064] The first zoom lens group G2 consists of, from the object plane side to the image plane side, a first zoom lens b1 with negative optical power, a second fixed lens a2 with negative optical power, a third zoom lens b3 with negative optical power, a fourth zoom lens b4 with positive optical power, and a fifth zoom lens b5 with negative optical power; the fourth zoom lens b4 and the fifth zoom lens b5 are cemented together. The third zoom lens group G5 is a fourteenth zoom lens b14 with positive optical power.

[0065] Alternatively, the first zoom lens group G2 may consist, from the object plane side to the image plane side, a first zoom lens b1 with negative optical power, a third zoom lens b3 with negative optical power, a fourth zoom lens b4 with positive optical power, and a fifth zoom lens b5 with negative optical power; the third zoom lens b3 and the fourth zoom lens b4 are cemented together. The third zoom lens b3 may consist, from the object plane side to the image plane side, a twelfth zoom lens b12 with positive optical power, a thirteenth zoom lens b13 with negative optical power, and a fourteenth zoom lens b14 with positive optical power.

[0066] The zoom lens satisfies the following condition:

[0067] -2 < fG2 / fw < -1;

[0068] Wherein, fG2 is the focal length of the first zoom lens group G2.

[0069] In this embodiment, the optical path of the zoom lens is optimized by limiting the first zoom lens group G2, reducing the light dissipation of the first zoom lens group G2 when receiving light from the fixed lens group G1, and increasing the brightness of the zoom lens imaging.

[0070] The zoom lens satisfies the following condition:

[0071] 2 < fG5 / fw < 3;

[0072] Wherein, fG5 is the focal length of the third zoom lens group G5.

[0073] By limiting the focal length of the third zoom lens group G5, the coma and aberrations generated by the first zoom lens group G2 during movement are reduced, thereby increasing the image quality of the zoom lens.

[0074] The zoom lens satisfies the following condition:

[0075] XG4 / XG2 < 0.25;

[0076] Wherein, XG4 is the maximum moving distance of the focusing lens group G4.

[0077] By limiting the maximum moving distance of the focusing lens group G4, the moving range of the focusing lens group G4 is reduced while improving the imaging quality of the zoom lens, thus achieving miniaturization of the zoom lens.

[0078] The zoom lens satisfies the following condition:

[0079] XG5 / XG2 < 0.1;

[0080] Wherein, XG5 is the maximum moving distance of the third zoom lens group G5.

[0081] In this embodiment, while miniaturizing the zoom lens, the optical path of the zoom lens is optimized, thereby increasing the imaging quality of the zoom lens.

[0082] Example 2

[0083] like Figures 1 to 5 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, 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.

[0084] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, and the third zoom lens group G5 move along the principal optical axis of the zoom lens;

[0085] The fixed lens group G1 consists of a first fixed lens a1 with positive 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; the second fixed lens a2 and the third fixed lens a3 are cemented together.

[0086] The first zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second fixed lens a2 with negative optical power, a third zoom lens b3 with negative optical power, a fourth zoom lens b4 with positive optical power, and a fifth zoom lens b5 with negative optical power, from the object plane side to the image plane side; the fourth zoom lens b4 and the fifth zoom lens b5 are cemented together.

[0087] The second zoom lens group G3 consists of, from the object plane side to the image plane side, a sixth zoom lens b6 with positive optical power, a seventh zoom lens b7 with negative optical power, an eighth zoom lens b8 with positive optical power, a ninth zoom lens b9 with negative optical power, a tenth zoom lens b10 with negative optical power, and an eleventh zoom lens b11 with positive optical power; wherein, the seventh zoom lens b7, the eighth zoom lens b8, and the ninth zoom lens b9 form a cemented triplet lens.

[0088] The focusing lens group G4 consists of a first focusing lens c1 with negative optical power and a second focusing lens c2 with positive optical power, arranged sequentially from the object plane side to the image plane side. The first focusing lens c1 and the second focusing lens c2 are cemented together.

[0089] The third zoom lens group G5 is a fourteenth zoom lens b14 with positive optical power.

[0090] The auxiliary component G6 is a protective glass CG.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-005 represents 10. -5 .

[0095] Table 1

[0096]

[0097]

[0098] Table 2

[0099] Wide TELE D1 7.94 46.91 D2 53.35 1 D3 0.75 9.49 D4 9.21 15.88 D5 6.93 4.9

[0100] Table 3

[0101]

[0102]

[0103] In this embodiment, fw = 8.2 mm, ft = 147.6 mm, ft / fw = 18, fno = 2.44~4.35, and TTL = 160.02 mm;

[0104] Wherein, 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, fno is the aperture number of the zoom lens, and TTL is the total optical length of the zoom lens.

[0105] XG2=38.97mm, XG2 / fw=4.75;

[0106] Wherein, XG2 is the maximum moving distance of the first zoom lens group G2.

[0107] fG2=-14.49mm, fG2 / fw=-1.77;

[0108] Wherein, fG2 is the focal length of the first zoom lens group G2.

[0109] fG5=20.14mm, fG5 / fw=2.46;

[0110] Wherein, fG5 is the focal length of the third zoom lens group G5.

[0111] XG4=4.64mm, XG5=2.03mm;

[0112] XG4 / XG2=0.119; XG5 / XG2=0.052;

[0113] Wherein, XG4 is the maximum moving distance of the focusing lens group G4, and XG5 is the maximum moving distance of the third zoom lens group G5.

[0114] Example 3

[0115] like Figures 6 to 10 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, 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.

[0116] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, and the third zoom lens group G5 move along the principal optical axis of the zoom lens;

[0117] The fixed lens group G1 consists of a first fixed lens a1 with positive 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; the second fixed lens a2 and the third fixed lens a3 are cemented together.

[0118] The first zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a third zoom lens b3 with negative optical power, a fourth zoom lens b4 with positive optical power, and a fifth zoom lens b5 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.

[0119] The second zoom lens group G3 consists of, from the object plane side to the image plane side, a sixth zoom lens b6 with positive optical power, a seventh zoom lens b7 with negative optical power, an eighth zoom lens b8 with positive optical power, a ninth zoom lens b9 with negative optical power, a tenth zoom lens b10 with negative optical power, and an eleventh zoom lens b11 with positive optical power; wherein, the seventh zoom lens b7, the eighth zoom lens b8, and the ninth zoom lens b9 form a cemented triplet lens.

[0120] The focusing lens group G4 consists of a first focusing lens c1 with negative optical power and a second focusing lens c2 with positive optical power, arranged sequentially from the object plane side to the image plane side. The first focusing lens c1 and the second focusing lens c2 are cemented together.

[0121] The third zoom lens group G5 consists of a 12th zoom lens with positive optical power, a 13th zoom lens with negative optical power, and a 14th zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0122] The auxiliary component G6 is a protective glass CG.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] In Table 6, K is the conic coefficient, and e is the scientific notation, for example, e-005 represents 10. -5 .

[0127] Table 4

[0128]

[0129]

[0130] Table 5

[0131] Wide TELE D1 0.75 50.92 D2 72.27 1.00 D3 1.14 11.68 D4 1.61 14.51 D5 7.24 4.90

[0132] Table 6

[0133]

[0134] In this embodiment, fw = 8.2 mm, ft = 147.6 mm, ft / fw = 18, fno = 2.45~4.28, and TTL = 160.01 mm;

[0135] Wherein, 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, fno is the aperture number of the zoom lens, and TTL is the total optical length of the zoom lens.

[0136] XG2=50.17mm, XG2 / fw=6.12;

[0137] Wherein, XG2 is the maximum moving distance of the first zoom lens group G2.

[0138] fG2=-15.89mm, fG2 / fw=-1.94;

[0139] Wherein, fG2 is the focal length of the first zoom lens group G2.

[0140] fG5=21.48mm, fG5 / fw=2.62;

[0141] Wherein, fG5 is the focal length of the third zoom lens group G5.

[0142] XG4=10.56mm, XG5=2.34mm;

[0143] XG4 / XG2=0.21; XG5 / XG2=0.047;

[0144] Wherein, XG4 is the maximum moving distance of the focusing lens group G4, and XG5 is the maximum moving distance of the third zoom lens group G5.

[0145] Example 4

[0146] An imaging device, such as Figures 1 to 10 As 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, 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, 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 first zoom lens group, the second zoom lens group, the focusing lens group, and the third zoom lens group move along the principal optical axis of the zoom lens; The fixed lens group consists of a first fixed lens with positive 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 second fixed lens and the third fixed lens are cemented together. The focusing lens group consists of a first focusing lens with negative optical power and a second focusing lens with positive optical power, arranged sequentially from the object plane side to the image plane side, and the first focusing lens and the second focusing lens are cemented together. The zoom lens satisfies the following condition: ft / fw > 15; 3 < XG2 / fw < 7; Wherein, 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 XG2 is the maximum moving distance of the first zoom lens group.

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

3. A zoom lens according to claim 1, characterized in that: The first zoom lens group consists of a first zoom lens with negative optical power, a third zoom lens with negative optical power, a fourth zoom lens with positive optical power, and a fifth 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.

4. A zoom lens according to claim 1, characterized in that: The second zoom lens group consists of a sixth zoom lens with positive optical power, a seventh zoom lens with negative optical power, an eighth zoom lens with positive optical power, a ninth zoom lens with negative optical power, a tenth zoom lens with negative optical power, and an eleventh zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side; wherein the seventh zoom lens, the eighth zoom lens, and the ninth zoom lens form a cemented triplet lens.

5. A zoom lens according to claim 2, characterized in that: The third zoom lens is a fourteenth zoom lens with positive optical power.

6. A zoom lens according to claim 3, characterized in that: The third zoom lens consists of a 12th zoom lens with positive optical power, a 13th zoom lens with negative optical power, and a 14th zoom lens with positive optical power, sequentially from the object plane side to the image plane side.

7. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: -2 < fG2 / fw < -1; Where fG2 is the focal length of the first zoom lens group.

8. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 2 < fG5 / fw < 3; Wherein, fG5 is the focal length of the third zoom lens group.

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

10. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: XG5 / XG2 < 0.1; Wherein, XG5 is the maximum moving distance of the third zoom lens group.

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

Images