Zoom lens and imaging device

Abstract

The present application relates to the field of optics, specifically to a zoom lens and an imaging device, the zoom lens sequentially comprises a first lens group with negative focal length, a second lens group with positive focal length, a third lens group with negative focal length, a fourth lens group with positive focal length and a fifth lens group with positive focal length from the object side to the image side; the second lens group and the fourth lens group move along the direction of the main optical axis of the zoom lens; the zoom lens satisfies the following conditional expressions: TTL < 220 mm; 1.5 <= fno <= 2.4; 15 < ft / fw < 25; wherein, TTL is the total optical length of the zoom lens, fno is the aperture number of the zoom lens, ft is the focal length of the zoom lens in the telephoto state, and fw is the focal length of the zoom lens in the wide-angle state. A larger light flux of the zoom lens is achieved, and the total optical length of the zoom lens is reduced, thereby reducing the cost of the zoom lens and unnecessary waste.

Description

Technical Field

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

[0002] In the past, to achieve high-magnification zoom, lenses typically required a large overall optical length and a group of lenses with large outer diameters. However, these high-magnification zoom lenses were bulky and expensive, resulting in unnecessary waste. Summary of the Invention

[0003] This invention addresses existing technical problems by providing a zoom lens and imaging device that achieves greater light transmission while reducing the overall optical length of the zoom lens, thereby reducing its cost and minimizing unnecessary waste.

[0004] The technical solution provided by this invention is as follows:

[0005] A zoom lens, wherein the zoom lens is composed of a first lens group with negative optical power, a second lens group with positive optical power, a third lens group with negative optical power, a fourth lens group with positive optical power and a fifth lens group with positive optical power, in sequence from the object plane side to the image plane side.

[0006] The second lens group and the fourth lens group move along the principal optical axis of the zoom lens;

[0007] The zoom lens satisfies the following condition:

[0008] TTL < 220mm;

[0009] 1.5 ≤ fno ≤ 2.4;

[0010] 15 < ft / fw < 25;

[0011] Wherein, TTL is the total optical length of the zoom lens, fno is the aperture number 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.

[0012] In this technical solution, by setting the above parameters and structure, a large magnification of the zoom lens is achieved, while also achieving a large amount of light transmission. The overall optical length of the zoom lens is also reduced, thereby reducing the cost of the zoom lens and minimizing unnecessary waste.

[0013] Preferably, the first lens group includes at least one lens with positive optical power.

[0014] In this technical solution, by setting a positive lens, it is beneficial to reasonably set the optical power of the lenses in the first lens group, reducing the possibility that the optical power of the lenses in the first lens group is too large or too small, and also beneficial to correct the aberrations and coma of the zoom lens, thereby increasing the imaging quality of the zoom lens.

[0015] Preferably, the first lens group consists of a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with positive optical power, and a ninth lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0016] In this technical solution, by setting multiple lenses in the first lens group, the outer diameter and thickness of the lenses in the first lens group are reduced, which facilitates the processing of the lenses, reduces the cost of the zoom lens, and realizes the miniaturization of the zoom lens.

[0017] Preferably, the first lens group consists of a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with positive optical power, and a ninth lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0018] Preferably, both curved surfaces of the first lens are curved toward the object surface;

[0019] The radius of curvature of the curved surface of the first lens near the object plane is greater than the radius of curvature of the curved surface of the first lens near the image plane.

[0020] In this technical solution, by limiting the curvature radius of the curved surfaces on both sides of the first lens, the first lens is crescent-shaped and the image surface is curved, so the first lens can form a large field of view, which is beneficial to the formation of a large field of view of the zoom lens.

[0021] Preferably, the second lens group consists of a tenth lens with negative optical power, an eleventh lens with negative optical power, a twelfth lens with positive optical power, and a thirteenth lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0022] Preferably, the third lens group consists of a fifteenth lens with positive optical power, a sixteenth lens with negative optical power, and a seventeenth lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0023] The third lens group consists of a fourteenth lens with positive optical power, a fifteenth lens with positive optical power, a sixteenth lens with negative optical power, and a seventeenth lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0024] Preferably, the fifth lens group consists of a nineteenth lens with positive optical power, a twentieth lens with negative optical power, a twenty-first lens with positive optical power, and a twenty-second lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0025] Preferably, the zoom lens comprises at most one aspherical lens.

[0026] In this technical solution, the aberrations and distortions of the zoom lens are reduced by using an aspherical lens, thereby increasing the resolution and image quality of the zoom lens; and since it contains at most one aspherical lens, the cost of the zoom lens is further reduced.

[0027] Preferably, the aspherical lens is disposed within the third lens group, and the aspherical lens is disposed at one end of the third lens group near the object surface.

[0028] In this technical solution, when the aspherical lens is located on the object plane side within the third lens group, the aspherical lens can quickly correct the aberration of the light rays behind the aperture stop, thereby increasing the imaging quality of the zoom lens.

[0029] Preferably, the first lens group satisfies the following condition:

[0030] f + < ft / 2;

[0031] Where f+ is the focal length of the positive lens closest to the object plane in the first lens group.

[0032] In this technical solution, limiting the focal length of the positive lens within the first lens group facilitates the adjustment of the optical path.

[0033] Preferably, the zoom lens satisfies the following condition:

[0034] 0.15 < S4 / S2 < 0.2;

[0035] Wherein, S2 is the moving distance of the second lens group, and S4 is the moving distance of the fourth lens group.

[0036] In this technical solution, by limiting the moving distance of the second lens group and the fourth lens group, a large zoom range is ensured for the zoom lens, while not causing a large total optical length. At the same time, a certain degree of focusing can be achieved, which corrects the aberrations of the zoom lens and increases the imaging quality of the zoom lens.

[0037] Preferably, the zoom lens satisfies the following condition:

[0038] Φg1 / TTL<0.5;

[0039] Wherein, Φg1 is the outer diameter of the first lens group.

[0040] In this technical solution, by limiting the outer diameter of the first lens group, the outer diameter of the lens with the largest outer diameter in the first lens group is reduced, thereby reducing the effective aperture of the lens, reducing the material required for the zoom lens, and reducing the cost of the zoom lens.

[0041] Preferably, the zoom lens satisfies the following condition:

[0042] DG1 / TTL < 0.45;

[0043] Wherein, DG1 is the length of the zoom lens.

[0044] In this technical solution, by limiting the length of the zoom lens, the materials required for the zoom lens are directly limited, thereby reducing the cost of the zoom lens.

[0045] 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.

[0046] Compared with the prior art, the zoom lens and imaging device provided by the present invention have the following beneficial effects:

[0047] 1. By setting a positive lens, it is beneficial to reasonably set the optical power of the lenses in the first lens group, reducing the possibility that the optical power of the lenses in the first lens group is too large or too small. It is also beneficial to correct the aberrations and coma of the zoom lens, thereby increasing the imaging quality of the zoom lens.

[0048] 2. By setting multiple lenses in the first lens group, the outer diameter and thickness of the lenses in the first lens group are reduced, which facilitates the processing of the lenses, reduces the cost of the zoom lens, and realizes the miniaturization of the zoom lens.

[0049] 3. By limiting the curvature radius of the curved surfaces on both sides of the first lens, the first lens is crescent-shaped and the image surface is curved, so the first lens can form a large field of view, which is beneficial to the formation of a large field of view of the zoom lens. Attached Figure Description

[0050] 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.

[0051] Figure 1 This is a schematic diagram of the structure of a zoom lens according to the present invention;

[0052] Figure 2 This is an aberration diagram of a zoom lens according to the present invention;

[0053] Figure 3This is a schematic diagram of another zoom lens according to the present invention;

[0054] Figure 4 This is an aberration diagram of another zoom lens of the present invention.

[0055] Explanation of reference numerals: G1, First lens group; G2, Second lens group; G3, Third lens group; G4, Fourth lens group; G5, Fifth lens group; G6, Auxiliary component; L1, First lens; L2, Second lens; L3, Third lens; L4, Fourth lens; L5, Fifth lens; L6, Sixth lens; L7, Seventh lens; L8, Eighth lens; L9, Ninth lens; L10, Tenth lens; L11, Eleventh lens; L12, Twelfth lens; L13, Thirteenth lens; L14, Fourteenth lens; L15, Fifteenth lens; L16, Sixteenth lens; L17, Seventeenth lens; L18, Eighteenth lens; L19, Nineteenth lens; L20, Twentieth lens; L21, Twenty-first lens; L22, Twenty-second lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation

[0056] 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.

[0057] 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."

[0058] Example 1

[0059] like Figure 1 As shown, a zoom lens, comprising, from the object plane side to the image plane side, the following components:

[0060] The first lens group G1 has negative optical power, the second lens group G2 has positive optical power, the third lens group G3 has negative optical power, the fourth lens group G4 has positive optical power, and the fifth lens group G5 has positive optical power.

[0061] The second lens group G2 and the fourth lens group G4 move along the principal optical axis of the zoom lens.

[0062] The zoom lens satisfies the following condition:

[0063] TTL < 220mm;

[0064] 1.5 ≤ fno ≤ 2.4;

[0065] 15 < ft / fw < 25;

[0066] Wherein, TTL is the total optical length of the zoom lens, fno is the aperture number 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.

[0067] In this embodiment, by setting the above parameters and structure, a large magnification of the zoom lens is achieved, while also achieving a large amount of light transmission. The overall optical length of the zoom lens is also reduced, thereby reducing the cost of the zoom lens and minimizing unnecessary waste.

[0068] The first lens group G1 includes at least one lens with positive optical power.

[0069] In this embodiment, by setting a positive lens, it is beneficial to reasonably set the optical power of the lenses in the first lens group G1, reducing the possibility that the optical power of the lenses in the first lens group G1 is too large or too small, and also beneficial to correct the aberrations and coma of the zoom lens, thereby increasing the imaging quality of the zoom lens.

[0070] The first lens group G1 includes, from the object plane side to the image plane side, the following:

[0071] The first lens L1 has negative optical power, the second lens L2 has negative optical power, the third lens L3 has positive optical power, the fourth lens L4 has negative optical power, the fifth lens L5 has positive optical power, the sixth lens L6 has negative optical power, the seventh lens L7 has positive optical power, the eighth lens L8 has positive optical power, and the ninth lens L9 has positive optical power.

[0072] In this embodiment, by setting multiple lenses in the first lens group G1, the outer diameter and thickness of the lenses in the first lens group G1 are reduced, which facilitates the processing of the lenses, reduces the cost of the zoom lens, and realizes the miniaturization of the zoom lens.

[0073] The third lens group G3, from the object plane side to the image plane side, includes the following:

[0074] The fifteenth lens L15 has positive optical power, the sixteenth lens L16 has negative optical power, and the seventeenth lens L17 has positive optical power.

[0075] Alternatively, the first lens group G1 may include, from the object plane side to the image plane side, the following sequentially:

[0076] The first lens L1 has negative optical power, the second lens L2 has negative optical power, the third lens L3 has positive optical power, the sixth lens L6 has negative optical power, the seventh lens L7 has positive optical power, the eighth lens L8 has positive optical power, and the ninth lens L9 has positive optical power.

[0077] The third lens group G3, from the object plane side to the image plane side, includes the following:

[0078] The fourteenth lens L14 with positive optical power, the fifteenth lens L15 with positive optical power, the sixteenth lens L16 with negative optical power, and the seventeenth lens L17 with positive optical power.

[0079] Preferably, both curved surfaces of the first lens L1 are curved toward the object surface;

[0080] The radius of curvature of the surface of the first lens L1 near the object plane is greater than the radius of curvature of the surface of the first lens L1 near the image plane.

[0081] By defining the curvature radii of the two curved surfaces of the first lens L1, the first lens L1 is meniscus-shaped and the image surface is curved, thus the first lens L1 can form a large field of view, which is beneficial for the formation of a large field of view in zoom lenses.

[0082] The second lens group G2 includes, from the object plane side to the image plane side, the following:

[0083] The tenth lens L10 has negative optical power, the eleventh lens L11 has negative optical power, the twelfth lens L12 has positive optical power, and the thirteenth lens L13 has negative optical power.

[0084] The fifth lens group G5, from the object plane side to the image plane side, includes the following:

[0085] The nineteenth lens with positive optical power is L19, the twentieth lens with negative optical power is L20, the twenty-first lens with positive optical power is L21, and the twenty-second lens with negative optical power is L22.

[0086] The zoom lens contains at most one aspherical lens.

[0087] In this embodiment, by using an aspherical lens, the aberrations and distortions of the zoom lens are reduced, the resolving power of the zoom lens is increased, and the imaging quality of the zoom lens is improved; moreover, it contains at most one aspherical lens, which further reduces the cost of the zoom lens.

[0088] The aspherical lens is disposed within the third lens group G3, and the aspherical lens is disposed at the end of the third lens group G3 near the object surface.

[0089] When the aspherical lens is located on the object side within the third lens group G3, the aspherical lens can quickly correct the aberrations of the light rays behind the aperture stop STO, thereby increasing the image quality of the zoom lens.

[0090] The first lens group G1 satisfies the following condition:

[0091] f + < ft / 2;

[0092] Where f+ is the focal length of the positive lens closest to the object plane in the first lens group G1.

[0093] In this embodiment, limiting the focal length of the positive lens within the first lens group G1 facilitates the adjustment of the optical path.

[0094] The zoom lens satisfies the following condition:

[0095] 0.15 < S4 / S2 < 0.2;

[0096] Wherein, S2 is the moving distance of the second lens group G2, and S4 is the moving distance of the fourth lens group G4.

[0097] In this embodiment, by limiting the moving distance of the second lens group G2 and the fourth lens group G4, a large zoom range is ensured for the zoom lens, while avoiding a large overall optical length. At the same time, a certain degree of focusing can be achieved, correcting the aberrations of the zoom lens and increasing the imaging quality of the zoom lens.

[0098] The zoom lens satisfies the following condition:

[0099] Φg1 / TTL<0.5;

[0100] Wherein, Φg1 is the outer diameter of the first lens group G1.

[0101] In this embodiment, by limiting the outer diameter of the first lens group G1, the outer diameter of the lens with the largest outer diameter in the first lens group G1 is reduced, thereby reducing the effective aperture of the lens, reducing the material required for the zoom lens, and reducing the cost of the zoom lens.

[0102] The zoom lens satisfies the following condition:

[0103] DG1 / TTL < 0.45;

[0104] Wherein, DG1 is the length of the zoom lens.

[0105] By limiting the length of the zoom lens, the materials required for the zoom lens are directly limited, thereby reducing the cost of the zoom lens.

[0106] Example 2

[0107] like Figure 1 and Figure 2 As shown, a zoom lens, comprising, from the object plane side to the image plane side, the following components:

[0108] The first lens group G1 with negative optical power, the second lens group G2 with positive optical power, the third lens group G3 with negative optical power, the fourth lens group G4 with positive optical power, the fifth lens group G5 with positive optical power, and the auxiliary component G6.

[0109] The first lens group G1 includes, from the object plane side to the image plane side, the following:

[0110] The first lens L1 has negative optical power, the second lens L2 has negative optical power, the third lens L3 has positive optical power, the fourth lens L4 has negative optical power, the fifth lens L5 has positive optical power, the sixth lens L6 has negative optical power, the seventh lens L7 has positive optical power, the eighth lens L8 has positive optical power, and the ninth lens L9 has positive optical power.

[0111] The second lens group G2 includes, from the object plane side to the image plane side, the following:

[0112] The tenth lens L10 has negative optical power, the eleventh lens L11 has negative optical power, the twelfth lens L12 has positive optical power, and the thirteenth lens L13 has negative optical power.

[0113] The third lens group G3, from the object plane side to the image plane side, includes the following:

[0114] The fifteenth lens L15 has positive optical power, the sixteenth lens L16 has negative optical power, and the seventeenth lens L17 has positive optical power.

[0115] The fourth lens group G4 is an eighteenth lens L18 with negative optical power.

[0116] The fifth lens group G5, from the object plane side to the image plane side, includes the following:

[0117] The nineteenth lens with positive optical power is L19, the twentieth lens with negative optical power is L20, the twenty-first lens with positive optical power is L21, and the twenty-second lens with negative optical power is L22.

[0118] The auxiliary component G6 is a protective glass CG.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0123] Table 1

[0124]

[0125]

[0126]

[0127] Table 2

[0128] D1 0.2 31.6 D2 31.6 0.2 D3 0.2 5.9 D4 24.1 18.4

[0129] Table 3

[0130]

[0131] In this embodiment, TTL = 187.5 mm, fno = 1.5-2.4, FOV = 9°-100°, fw = 4 mm, ft = 80 mm, ft / fw = 20;

[0132] Wherein, TTL is the total optical length of the zoom lens, fno is the aperture number 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 FOV is the field of view of the zoom lens.

[0133] S4=5.7mm, S2=31.4mm, S4 / S2=0.182;

[0134] Wherein, S2 is the moving distance of the second lens group G2, and S4 is the moving distance of the fourth lens group G4.

[0135] Φg1=81.9mm, Φg1 / TTL=0.437;

[0136] DG1=73.1mm, DG1 / TTL=0.39;

[0137] Wherein, Φg1 is the outer diameter of the first lens group G1, and DG1 is the length of the zoom lens.

[0138] Example 3

[0139] like Figure 3 and Figure 4 As shown, a zoom lens, comprising, from the object plane side to the image plane side, the following components:

[0140] The first lens group G1 with negative optical power, the second lens group G2 with positive optical power, the third lens group G3 with negative optical power, the fourth lens group G4 with positive optical power, the fifth lens group G5 with positive optical power, and the auxiliary component G6.

[0141] The first lens group G1 includes, from the object plane side to the image plane side, the following:

[0142] The first lens L1 has negative optical power, the second lens L2 has negative optical power, the third lens L3 has positive optical power, the sixth lens L6 has negative optical power, the seventh lens L7 has positive optical power, the eighth lens L8 has positive optical power, and the ninth lens L9 has positive optical power.

[0143] The second lens group G2 includes, from the object plane side to the image plane side, the following:

[0144] The tenth lens L10 has negative optical power, the eleventh lens L11 has negative optical power, the twelfth lens L12 has positive optical power, and the thirteenth lens L13 has negative optical power.

[0145] The third lens group G3, from the object plane side to the image plane side, includes the following:

[0146] The fourteenth lens L14 with positive optical power, the fifteenth lens L15 with positive optical power, the sixteenth lens L16 with negative optical power, and the seventeenth lens L17 with positive optical power.

[0147] The fourth lens group G4 is an eighteenth lens L18 with negative optical power.

[0148] The fifth lens group G5, from the object plane side to the image plane side, includes the following:

[0149] The nineteenth lens with positive optical power is L19, the twentieth lens with negative optical power is L20, the twenty-first lens with positive optical power is L21, and the twenty-second lens with negative optical power is L22.

[0150] The auxiliary component G6 is a protective glass CG.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] In Table 6, K is the conic coefficient and e is the scientific notation, for example, e-005 means 10⁻⁵.

[0155] Table 4

[0156]

[0157]

[0158] Table 5

[0159] D1 0.2 37.5 D2 37.5 0.2 D3 0.3 7.6 D4 20.8 13.5

[0160] Table 6

[0161]

[0162] In this embodiment, TTL = 210.4 mm, fno = 1.5-2.4, FOV = 9°-105°, fw = 4 mm, ft = 80 mm, ft / fw = 20;

[0163] Wherein, TTL is the total optical length of the zoom lens, fno is the aperture number 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 FOV is the field of view of the zoom lens.

[0164] S4=7.3mm, S2=37.3mm, S4 / S2=0.196;

[0165] Wherein, S2 is the moving distance of the second lens group G2, and S4 is the moving distance of the fourth lens group G4.

[0166] Φg1=85.9mm, Φg1 / TTL=0.408;

[0167] DG1=90.7mm, DG1 / TTL=0.431;

[0168] Wherein, Φg1 is the outer diameter of the first lens group G1, and DG1 is the length of the zoom lens.

[0169] Example 4

[0170] An imaging device, such as Figures 1 to 4 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.

[0171] 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 lens group with negative optical power, a second lens group with positive optical power, a third lens group with negative optical power, a fourth lens group with negative optical power, and a fifth lens group with positive optical power, in sequence from the object plane side to the image plane side. The second lens group and the fourth lens group move along the principal optical axis of the zoom lens; The second lens group consists of a tenth lens with negative optical power, an eleventh lens with negative optical power, a twelfth lens with positive optical power, and a thirteenth lens with negative optical power, arranged sequentially from the object plane side to the image plane side. The fourth lens group is an eighteenth lens with negative optical power; The fifth lens group consists of a nineteenth lens with positive optical power, a twentieth lens with negative optical power, a twenty-first lens with positive optical power, and a twenty-second lens with negative optical power, from the object plane side to the image plane side. The zoom lens satisfies the following condition: TTL < 220mm; 1.5 ≤ fno ≤ 2.4; 15 < ft / fw < 25; Wherein, TTL is the total optical length of the zoom lens, fno is the aperture number 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 first lens group includes at least one lens with positive optical power.

3. A zoom lens according to claim 1, characterized in that: The first lens group consists of a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with positive optical power, and a ninth lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

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

5. A zoom lens according to claim 3 or 4, characterized in that: Both curved surfaces of the first lens are bent toward the object surface; The radius of curvature of the curved surface of the first lens near the object plane is greater than the radius of curvature of the curved surface of the first lens near the image plane.

6. A zoom lens according to claim 3, characterized in that: The third lens group consists of a fifteenth lens with positive optical power, a sixteenth lens with negative optical power, and a seventeenth lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

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

8. A zoom lens according to claim 1, characterized in that: The zoom lens contains at most one aspherical lens.

9. A zoom lens according to claim 8, characterized in that: The aspherical lens is disposed within the third lens group, and the aspherical lens is disposed at one end of the third lens group near the object surface.

10. A zoom lens according to claim 2, characterized in that: The first lens group satisfies the following condition: f + < ft / 2; Where f+ is the focal length of the positive lens closest to the object plane in the first lens group.

11. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 0.15 < S4 / S2 < 0.2; Wherein, S2 is the moving distance of the second lens group, and S4 is the moving distance of the fourth lens group.

12. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: Φg1 / TTL<0.5; Wherein, Φg1 is the outer diameter of the first lens group.

13. A zoom lens according to claim 1 or 12, characterized in that: The zoom lens satisfies the following condition: DG1 / TTL < 0.45; Wherein, DG1 is the length of the zoom lens.

14. An imaging device, characterized in that, include: The zoom lens as described in any one of claims 1 to 13; And an imaging element, configured to receive an image formed by the zoom lens.

Images