Zoom lens and unmanned aerial vehicle

Abstract

This invention relates to the field of optics, specifically to a zoom lens and a drone. The zoom lens, from the object plane side to the image plane side, comprises: a first fixed lens group with positive optical power, a first zoom lens group with negative optical power, a second fixed lens group with positive optical power, a second zoom lens group with positive optical power, a focusing lens group with negative optical power, and a third fixed lens group with positive optical power. The zoom lens satisfies the following conditions: TTL < 50mm; fw > 18mm; where fw is the focal length of the zoom lens in wide-angle mode, and TTL is the total optical length of the zoom lens. This invention achieves adjustment of the image distance of the zoom lens group, enables imaging through multi-group linkage, reduces aberrations and coma, further reduces the size of the zoom lens, achieves miniaturization of the zoom lens, and facilitates the development of zoom lenses with larger focal lengths.

Description

Technical Field

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

[0002] Unmanned aerial vehicles (UAVs) are unmanned aircraft controlled by radio remote control equipment and their own program control devices, or operated autonomously by an onboard computer, either completely or intermittently.

[0003] Compared to manned aircraft, drones are often better suited for tasks that are too "dull, dirty, or dangerous." Drones can be categorized into military and civilian applications. In the military field, drones are divided into reconnaissance drones and target drones. In the civilian field, drones combined with industry applications represent the true necessity of drones; their applications in aerial photography, agriculture, plant protection, miniature selfies, express delivery, disaster relief, wildlife observation, infectious disease monitoring, surveying, news reporting, power line inspection, disaster relief, film and television production, and creating romantic moments, among others, have greatly expanded the uses of drones. Developed countries are also actively expanding industry applications and developing drone technology.

[0004] Zoom lenses, as the core of drones, play a crucial role. However, existing zoom lenses in drones are typically large and have short focal lengths, making them unsuitable for applications requiring large-scale drone shooting capabilities. Summary of the Invention

[0005] This invention addresses existing technical problems by providing a zoom lens and a drone. It enables adjustment of the image distance of the zoom lens group, achieves imaging through multi-group linkage, reduces aberrations and coma in the zoom lens, further reduces the size of the zoom lens, and achieves miniaturization of the zoom lens. It also facilitates the development of zoom lenses with larger focal lengths.

[0006] The technical solution provided by this invention is as follows: A zoom lens, wherein the zoom lens is composed of, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a first zoom lens group with negative optical power, a second fixed lens group with positive optical power, a second zoom lens group with positive optical power, a focusing lens group with negative optical power, and a third fixed lens group with positive optical power. The first zoom lens group, the second zoom lens group, and the focusing lens group move along the principal optical axis of the zoom lens; The first zoom lens group, the second zoom lens group, and the focusing lens group are all used to adjust the image distance of the zoom lens; The focusing lens group is also used to adjust the object distance of the zoom lens; The zoom lens satisfies the following condition: TTL < 50mm; fw > 18mm; Where fw is the focal length of the zoom lens in wide-angle mode, and TTL is the total optical length of the zoom lens.

[0007] In this technical solution, by limiting the total optical length of the zoom lens and its wide-angle state, the increased zoom lens can be applied to a wider range of scenarios, thereby increasing the shooting range of the drone. At the same time, by setting up the first zoom lens group, the second zoom lens group, and the focusing lens group, the image distance of the zoom lens group can be adjusted. The multi-group linkage realizes the imaging of the zoom lens and reduces the aberration and coma of the zoom lens. The focusing lens group is also used to adjust the object distance of the zoom lens, which can further reduce the size of the zoom lens, realize the miniaturization of the zoom lens, and also facilitate the realization of zoom lenses with larger focal lengths.

[0008] Preferably, the first fixed lens group consists of a first fixed lens with negative optical power, a second fixed lens with positive optical power, and a third fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side, with the first fixed lens and the second fixed lens cemented together.

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

[0010] Preferably, the second fixed lens is a fourth fixed lens with positive optical power; and / or The third fixed lens is a fifth fixed lens with positive optical power.

[0011] Preferably, the second zoom lens group consists of a fifth zoom lens with negative optical power and a sixth zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side, with the fifth zoom lens and the sixth zoom lens cemented together.

[0012] Preferably, the focusing lens group consists of a first focusing lens with positive optical power, a second focusing lens with negative optical power, a third focusing lens with negative optical power, and a fourth focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0013] Preferably, the zoom lens further includes an aperture stop, which is disposed on the object plane side or image plane side of the second fixed lens group.

[0014] In this technical solution, by limiting the position of the aperture stop, fine adjustment of the vertical light rays at the second fixed lens group is achieved, thereby increasing the applicability of the zoom lens.

[0015] Preferably, the first zoom lens group, the second zoom lens group, and the focusing lens group are all provided with aspherical lenses.

[0016] In this technical solution, by using an aspherical surface, the number of lenses inside the zoom lens is reduced, thereby miniaturizing the zoom lens, reducing aberrations and coma, and increasing the imaging quality of the zoom lens.

[0017] Preferably, the zoom lens satisfies the following condition: 2000mm < Umin < 4000mm; Wherein, Umin is the minimum object distance of the zoom lens.

[0018] In this technical solution, by limiting the minimum object distance, the adjustment range of the focusing lens group is reduced, the zoom lens is miniaturized, the aberrations and coma of the zoom lens during the zoom process are increased, the imaging quality of the zoom lens is increased, and the design difficulty of the zoom lens is reduced.

[0019] Preferably, the zoom lens satisfies the following condition: 0.5 < DSI / TTL < 0.6; Wherein, DSI is the distance between the aperture stop and the image plane.

[0020] In this technical solution, by adjusting the distance between the aperture stop and the image plane, the possibility of excessive offset between the upper and lower aperture stops of the second fixed lens group is reduced, the ability of the second fixed lens group to correct aberrations and coma of the zoom lens is increased, and the imaging quality of the zoom lens is improved.

[0021] Preferably, the zoom lens satisfies the following condition: 0.65 < fG3 / fw < 0.8; Where fG3 is the focal length of the second fixed lens group.

[0022] In this technical solution, by limiting the focal length of the second fixed lens group, the correction capability of the second fixed lens group is further increased, and the spacing between the upper and lower light rays of the second fixed lens group is also controlled, which is beneficial to improving the imaging quality of the zoom lens.

[0023] Preferably, the zoom lens satisfies the following condition: SG5max / SG2 > 0.8; SG4max / SG2 < 0.5; Wherein, SG2 is the moving distance of the first zoom lens group, SG4max is the maximum moving distance of the second zoom lens group, and SG5max is the maximum moving distance of the focusing lens group.

[0024] In this technical solution, by limiting the maximum moving distance of the second zoom lens group and the focusing lens group, the zoom range of the zoom lens is increased while achieving a small size.

[0025] Preferably, the focusing lens group is also used to adjust the object distance; XG5 / SG5max < 0.03; Wherein, XG5 is the moving distance of the focusing lens group when adjusting the object distance.

[0026] In this technical solution, by limiting the moving distance of the focusing lens group when adjusting the object distance, the range of lens movement of the zoom lens when adjusting the object distance is reduced, thereby increasing the imaging quality of the zoom lens when the object distance changes.

[0027] One of the objectives of this invention is to provide a drone, comprising: a zoom lens; and an imaging element configured to receive an image formed by the zoom lens.

[0028] Compared with existing technologies, the zoom lens and drone provided by this invention have the following advantages: 1. By limiting the total optical length and wide-angle state of the zoom lens, the increased zoom lens can be applied to a wider range of scenarios, thereby increasing the shooting range of the drone; at the same time, by setting up the first zoom lens group, the second zoom lens group, and the focusing lens group, the image distance of the zoom lens group can be adjusted, and the multi-group linkage realizes the imaging of the zoom lens, reducing the aberration and coma of the zoom lens; the focusing lens group is also used to adjust the object distance of the zoom lens, which can further reduce the size of the zoom lens, realize the miniaturization of the zoom lens, and also facilitate the realization of zoom lenses with larger focal lengths.

[0029] 2. By limiting the minimum object distance, the adjustment range of the focusing lens group is reduced, which enables the miniaturization of the zoom lens. It also increases the aberrations and coma of the zoom lens during the zooming process, thereby increasing the image quality of the zoom lens, while also reducing the design difficulty of the zoom lens.

[0030] 3. By adjusting the distance between the aperture stop and the image plane, the possibility of excessive offset between the upper and lower aperture stops of the second fixed lens group is reduced, the ability of the second fixed lens group to correct aberrations and coma of the zoom lens is increased, and the image quality of the zoom lens is improved.

[0031] 4. By limiting the movement distance of the focusing lens group when adjusting the object distance, the range of lens movement of the zoom lens when adjusting the object distance is reduced, thereby increasing the image quality of the zoom lens when the object distance changes. Attached Figure Description

[0032] The preferred embodiments will be described below 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 a drone.

[0033] Figure 1 This is a schematic diagram of the structure of a zoom lens according to the present invention; Figure 2 This invention provides a coma diagram of a zoom lens in telephoto mode. Figure 3 This is an aberration diagram of a zoom lens in telephoto mode according to the present invention; Figure 4 This invention relates to a coma diagram of a zoom lens in a wide-angle state. Figure 5 This is an aberration diagram of a zoom lens in a wide-angle state according to the present invention; Figure 6 This is a schematic diagram of another zoom lens according to the present invention; Figure 7 This is another coma diagram of the zoom lens in telephoto mode according to the present invention; Figure 8 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention; Figure 9 This is another coma diagram of the zoom lens in the wide-angle state according to the present invention; Figure 10 This is another aberration diagram of the zoom lens in the wide-angle state according to the present invention.

[0034] Explanation of reference numerals: G1, First fixed lens group; G2, First zoom lens group; G3, Second fixed lens group; G4, Second zoom lens group; G5, Focusing lens group; G6, Third fixed lens group; G7, Auxiliary component; a1, First fixed lens; a2, Second fixed lens; a3, Third fixed lens; a4, Fourth fixed lens; a5, Fifth 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; c1, First focusing lens; c2, Second focusing lens; c3, Third focusing lens; c4, Fourth focusing lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation

[0035] 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.

[0036] 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." Example

[0037] like Figure 1 and Figure 6 As shown, a zoom lens, comprising, from the object plane side to the image plane side, the following components: The first fixed lens group G1 with positive optical power, the first zoom lens group G2 with negative optical power, the second fixed lens group G3 with positive optical power, the second zoom lens group G4 with positive optical power, the focusing lens group G5 with negative optical power, and the third fixed lens group G6 with positive optical power. The first zoom lens group G2, the second zoom lens group G4, and the focusing lens group G5 move along the main optical axis of the zoom lens; The first zoom lens group G2, the second zoom lens group G4, and the focusing lens group G5 are all used to adjust the image distance of the zoom lens; The focusing lens group G5 is also used to adjust the object distance of the zoom lens. The zoom lens satisfies the following condition: TTL < 50mm; fw > 18mm; Where fw is the focal length of the zoom lens in wide-angle mode, and TTL is the total optical length of the zoom lens.

[0038] In this embodiment, by limiting the total optical length of the zoom lens and its wide-angle state, the increased zoom lens can be applied to a wider range of scenarios, thereby increasing the shooting range of the drone. At the same time, by setting up the first zoom lens group G2, the second zoom lens group G4, and the focusing lens group G5, the image distance of the zoom lens group can be adjusted. The multi-group linkage realizes the imaging of the zoom lens and reduces the aberration and coma of the zoom lens. The focusing lens group G5 is also used to adjust the object distance of the zoom lens, which can further reduce the size of the zoom lens, realize the miniaturization of the zoom lens, and also facilitate the realization of zoom lenses with larger focal lengths.

[0039] The first fixed lens group G1 includes, from the object plane side to the image plane side, the following: 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 the first fixed lens a1 and the second fixed lens a2 are cemented together.

[0040] The first zoom lens group G2 includes, from the object plane side to the image plane side, the following: A first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with positive optical power, and a fourth zoom lens b4 with negative optical power, wherein the second zoom lens b2 and the third zoom lens b3 are cemented together.

[0041] The second fixed lens group G3 is a fourth fixed lens a4 with positive optical power; and / or The third fixed lens group G6 is the fifth fixed lens a5 with positive optical power.

[0042] The second zoom lens group G4 includes, from the object plane side to the image plane side, the following: A fifth zoom lens b5 with negative optical power, a sixth zoom lens b6 with positive optical power, and the fifth zoom lens b5 and the sixth zoom lens b6 are cemented together.

[0043] The focusing lens group G5 includes, from the object plane side to the image plane side, the following: A first focusing lens c1 with positive optical power, a second focusing lens c2 with negative optical power, a third focusing lens c3 with negative optical power, and a fourth focusing lens c4 with negative optical power.

[0044] The zoom lens also includes an aperture stop STO, which is disposed on the object plane side or image plane side of the second fixed lens group G3.

[0045] In this embodiment, by limiting the position of the aperture stop STO, fine adjustment of the vertical light rays at the second fixed lens group G3 is achieved, increasing the applicability of the zoom lens.

[0046] The first zoom lens group G2, the second zoom lens group G4, and the focusing lens group G5 are all equipped with aspherical lenses.

[0047] By using aspherical surfaces, the number of lenses inside the zoom lens is reduced, enabling miniaturization of the zoom lens, reducing aberrations and coma, and increasing the image quality of the zoom lens.

[0048] The zoom lens satisfies the following condition: 2000mm < Umin < 4000mm; Wherein, Umin is the minimum object distance of the zoom lens.

[0049] By limiting the minimum object distance, the adjustment range of the focusing lens group G5 is reduced, enabling the miniaturization of the zoom lens. This also increases the aberrations and coma of the zoom lens during the zoom process, thereby improving the image quality of the zoom lens and reducing the design difficulty of the zoom lens.

[0050] The zoom lens satisfies the following condition: 0.5 < DSI / TTL < 0.6; Wherein, DSI is the distance between the aperture stop STO and the image plane.

[0051] By adjusting the distance between the aperture stop STO and the image plane, the possibility of excessive offset of the upper and lower aperture stops STO of the second fixed lens group G3 is reduced, thereby increasing the ability of the second fixed lens group G3 to correct aberrations and coma of the zoom lens and improving the image quality of the zoom lens.

[0052] The zoom lens satisfies the following condition: 0.65 < fG3 / fw < 0.8; Where fG3 is the focal length of the second fixed lens group G3.

[0053] In this embodiment, by limiting the focal length of the second fixed lens group G3, the correction capability of the second fixed lens group G3 is further increased, and the spacing between the upper and lower light rays of the second fixed lens group G3 is also controlled, which is beneficial to increasing the imaging quality of the zoom lens.

[0054] The zoom lens satisfies the following condition: SG5max / SG2 > 0.8; SG4max / SG2 < 0.5; Wherein, SG2 is the moving distance of the first zoom lens group G2, SG4max is the maximum moving distance of the second zoom lens group G4, and SG5max is the maximum moving distance of the focusing lens group G5.

[0055] By limiting the maximum movement distance of the second zoom lens group G4 and the focusing lens group G5, the zoom range of the zoom lens is increased while maintaining a small size.

[0056] The focusing lens group G5 is also used to adjust the object distance; XG5 / SG5max < 0.03; Wherein, XG5 is the moving distance of the focusing lens group G5 when adjusting the object distance.

[0057] By limiting the movement distance of the focusing lens group G5 when adjusting the object distance, the range of lens movement of the zoom lens when adjusting the object distance is reduced, thereby increasing the image quality of the zoom lens when the object distance changes.

[0058] The zoom lens satisfies the following condition: DG5 / fw < 0.4; -0.8 < fG5 / fw < -0.6; Wherein, DG5 is the total optical length of the focusing lens group G5, and fG5 is the focal length of the focusing lens group G5.

[0059] By limiting the total optical length of the focusing lens group G5, the zoom lens is miniaturized. At the same time, by limiting the focal length of the focusing lens group G5, aberrations and coma of the zoom lens are reduced, thereby increasing the image quality of the zoom lens. Example

[0060] like Figures 1 to 5 As shown, a zoom lens, comprising, from the object plane side to the image plane side, the following components: The first fixed lens group G1 with positive optical power, the first zoom lens group G2 with negative optical power, the second fixed lens group G3 with positive optical power, the aperture stop STO, the second zoom lens group G4 with positive optical power, the focusing lens group G5 with negative optical power, the third fixed lens group G6 with positive optical power, and the auxiliary component G7.

[0061] The first fixed lens group G1 includes, from the object plane side to the image plane side, the following: 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 the first fixed lens a1 and the second fixed lens a2 are cemented together.

[0062] The first zoom lens group G2 includes, from the object plane side to the image plane side, the following: A first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with positive optical power, and a fourth zoom lens b4 with negative optical power, wherein the second zoom lens b2 and the third zoom lens b3 are cemented together.

[0063] The second fixed lens group G3 is a fourth fixed lens a4 with positive optical power; The second zoom lens group G4 includes, from the object plane side to the image plane side, the following: A fifth zoom lens b5 with negative optical power, a sixth zoom lens b6 with positive optical power, and the fifth zoom lens b5 and the sixth zoom lens b6 are cemented together.

[0064] The focusing lens group G5 includes, from the object plane side to the image plane side, the following: A first focusing lens c1 with positive optical power, a second focusing lens c2 with negative optical power, a third focusing lens c3 with negative optical power, and a fourth focusing lens c4 with negative optical power.

[0065] The third fixed lens group G6 is the fifth fixed lens a5 with positive optical power.

[0066] The auxiliary component G7 is a protective glass CG.

[0067] 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 Tables 2 and 3, and the aspherical coefficients are shown in Table 4.

[0068] 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.

[0069] In Table 2, each column represents the specific values ​​of each variable parameter of the zoom lens in different states when the first zoom lens group G2, the second zoom lens group G4, and the focusing lens group G5 are all moving, i.e. when adjusting the image distance; in Table 3, each column represents the specific values ​​of each variable parameter of the zoom lens in different states when the focusing lens group G5 is moving, i.e. when adjusting the object distance, as well as the focal length of the zoom lens.

[0070] In Table 4, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0071] Table 1 OBJ S1 spherical 23.32 0.50 1.95 32.32 S2 spherical 15.75 2.54 1.46 90.20 S3 spherical -189.07 0.10 S4 aspherical 12.79 2.23 1.50 81.61 S5 aspherical 59.04 D1 S6 aspherical 28.12 0.50 1.88 37.22 S7 aspherical 8.96 2.03 S8 spherical -19.02 0.50 1.50 81.61 S9 spherical 19.79 0.00 S10 spherical 19.79 1.10 1.92 20.88 S11 spherical -105.88 0.79 S12 aspherical -16.14 0.50 1.50 81.61 S13 aspherical 54.88 D2 S14 aspherical 11.20 2.19 1.50 81.61 S15 aspherical -17.03 0.10 STO spherical INF D3 S17 spherical 15.18 0.50 2.00 25.46 S18 spherical 8.54 2.48 1.44 95.10 S19 spherical -22.09 0.10 S20 spherical INF D4 S21 aspherical -36.43 0.94 1.82 24.06 S22 aspherical -15.48 0.10 S23 spherical -164.67 0.50 1.50 81.61 S24 spherical 15.06 2.91 S25 spherical -8.41 0.50 1.95 32.32 S26 spherical -14.60 1.09 S27 aspherical 19.06 0.66 1.54 55.78 S28 aspherical 10.12 D5 S29 aspherical -37.86 1.29 1.65 21.45 S30 aspherical -19.67 0.80 S31 spherical INF 0.30 1.52 64.21 S32 spherical INF 2.00 　 　 IMG Table 2 Object distance INF INF D1 0.60 8.20 D2 8.30 0.70 D3 2.99 1.46 D4 5.95 0.70 D5 0.91 7.69 Table 3 Object distance INF 3000 D1 0.60 0.60 D2 8.30 8.30 D3 2.99 2.99 D4 5.95 6.06 D5 0.91 0.80 Table 4 S4 -7.30E-02 -3.12E-06 -5.61E-11 2.07E-09 -9.08E-11 S5 -1.45E+01 -2.74E-07 1.64E-07 -5.14E-09 4.01E-11 S6 1.11E+01 3.47E-05 -9.86E-07 -2.42E-08 -2.14E-09 S7 -5.49E-01 2.58E-04 2.19E-06 6.36E-08 -2.56E-09 S12 2.40E+00 -7.39E-04 3.19E-05 -6.70E-07 -5.19E-08 S13 -9.90E+01 -8.02E-04 3.30E-05 -1.13E-06 -6.56E-10 S15 -1.69E+00 -7.37E-06 -4.03E-07 8.65E-08 -3.58E-09 S16 8.18E+00 3.12E-04 3.67E-06 1.18E-07 -8.35E-09 S22 -2.33E+01 2.72E-04 1.09E-05 -6.97E-07 2.43E-08 S23 -4.88E+00 1.35E-04 1.52E-05 -1.10E-06 3.87E-08 S28 -9.90E+01 -3.94E-03 1.49E-04 -5.91E-06 6.17E-08 S29 -2.49E+01 -3.00E-03 1.25E-04 -4.84E-06 7.63E-08 S30 7.86E+00 -6.01E-04 1.84E-05 -3.12E-07 1.02E-08 S31 -2.61E+00 -7.88E-04 1.99E-05 -2.82E-07 4.68E-09 In this embodiment, TTL=46mm, fw=20mm, ft=55mm, ft / fw=2.75; Where fw is the focal length of the zoom lens in wide-angle mode, ft is the focal length of the zoom lens in telephoto mode, and TTL is the total optical length of the zoom lens.

[0072] Umin = 3000mm; Wherein, Umin is the minimum object distance of the zoom lens.

[0073] DSI=24.02mm, DSI / TTL=0.522; Wherein, DSI is the distance between the aperture stop STO and the image plane.

[0074] fG3=13.96mm, fG3 / fw=0.698; Where fG3 is the focal length of the second fixed lens group G3.

[0075] SG2 = 7.6 mm; SG5max=6.78mm, SG5max / SG2=0.89; SG4max=1.53mm, SG4max / SG2=0.2; Wherein, SG2 is the moving distance of the first zoom lens group G2, SG4max is the maximum moving distance of the second zoom lens group G4, and SG5max is the maximum moving distance of the focusing lens group G5.

[0076] XG5=0.11mm, XG5 / SG5max=0.016; Wherein, XG5 is the moving distance of the focusing lens group G5 when adjusting the object distance.

[0077] DG5=6.7mm, DG5 / fw=0.335; fG5 = -12.6, fG5 / fw = -0.63; Wherein, DG5 is the total optical length of the focusing lens group G5, and fG5 is the focal length of the focusing lens group G5. Example

[0078] like Figures 6 to 10 As shown, a zoom lens, comprising, from the object plane side to the image plane side, the following components: The first fixed lens group G1 with positive optical power, the first zoom lens group G2 with negative optical power, the second fixed lens group G3 with positive optical power, the aperture stop STO, the second zoom lens group G4 with positive optical power, the focusing lens group G5 with negative optical power, the third fixed lens group G6 with positive optical power, and the auxiliary component G7.

[0079] The first fixed lens group G1 includes, from the object plane side to the image plane side, the following: 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 the first fixed lens a1 and the second fixed lens a2 are cemented together.

[0080] The first zoom lens group G2 includes, from the object plane side to the image plane side, the following: A first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with positive optical power, and a fourth zoom lens b4 with negative optical power, wherein the second zoom lens b2 and the third zoom lens b3 are cemented together.

[0081] The second fixed lens group G3 is a fourth fixed lens a4 with positive optical power; The second zoom lens group G4 includes, from the object plane side to the image plane side, the following: A fifth zoom lens b5 with negative optical power, a sixth zoom lens b6 with positive optical power, and the fifth zoom lens b5 and the sixth zoom lens b6 are cemented together.

[0082] The focusing lens group G5 includes, from the object plane side to the image plane side, the following: A first focusing lens c1 with positive optical power, a second focusing lens c2 with negative optical power, a third focusing lens c3 with negative optical power, and a fourth focusing lens c4 with negative optical power.

[0083] The third fixed lens group G6 is the fifth fixed lens a5 with positive optical power.

[0084] The auxiliary component G7 is a protective glass CG.

[0085] The basic lens data of the zoom lens in this embodiment is shown in Table 5, the variable parameters in Table 5 are shown in Tables 6 and 7, and the aspherical coefficients are shown in Table 8.

[0086] 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.

[0087] In Table 6, each column represents the specific values ​​of each variable parameter of the zoom lens in different states when the first zoom lens group G2, the second zoom lens group G4, and the focusing lens group G5 are all moving, i.e. when adjusting the image distance; in Table 7, each column represents the specific values ​​of each variable parameter of the zoom lens in different states when the focusing lens group G5 is moving, i.e. when adjusting the object distance, as well as the focal length of the zoom lens.

[0088] In Table 8, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0089] Table 5 OBJ S1 spherical 19.95 0.50 1.90 31.32 S2 spherical 14.44 2.46 1.44 95.10 S3 spherical -939.91 0.10 S4 aspherical 13.36 1.93 1.50 81.61 S5 aspherical 52.25 D1 S6 aspherical 46.55 0.50 1.90 33.35 S7 aspherical 10.32 1.75 S8 spherical -22.15 0.50 1.46 90.20 S9 spherical 19.47 0.00 S10 spherical 19.47 1.08 1.96 19.90 S11 spherical -165.27 0.68 S12 aspherical -17.31 0.50 1.50 81.61 S13 aspherical 43.13 D2 STO spherical INF 0.10 S15 aspherical 11.37 2.34 1.50 81.61 S16 aspherical -20.05 D3 S17 spherical 13.87 0.50 2.00 25.46 S18 spherical 7.95 1.87 1.44 95.10 S19 spherical -28.58 0.10 S20 spherical INF D4 S21 aspherical 51.98 1.21 1.80 22.92 S22 aspherical -34.62 0.17 S23 aspherical 63.50 0.50 1.50 81.61 S24 aspherical 13.62 2.36 S25 spherical -10.65 0.50 1.95 32.32 S26 spherical -29.18 0.99 S27 aspherical 15.08 0.50 1.54 55.78 S28 aspherical 9.45 D5 S29 aspherical -40.29 1.04 1.65 21.45 S30 aspherical -23.45 1.95 S31 spherical INF 0.39 1.52 64.21 S32 spherical INF 0.66 　 　 IMG Table 6 Object distance INF INF D1 0.60 8.32 D2 8.32 0.6 D3 3.78 0.60 D4 7.03 0.60 D5 1.00 10.61 Table 7 Object distance INF 3000 D1 0.60 0.60 D2 8.32 8.32 D3 3.78 3.78 D4 7.03 7.23 D5 1.00 0.80 Table 8 S4 -6.57E-02 -2.94E-06 3.46E-08 4.88E-10 -2.49E-11 S5 -1.06E+01 1.06E-06 1.21E-07 -2.69E-09 2.87E-11 S6 7.90E+00 1.78E-05 8.79E-08 2.35E-08 -1.29E-09 S7 -1.03E+00 1.83E-04 1.63E-06 7.06E-08 4.56E-09 S12 -5.69E-01 -6.60E-04 3.46E-05 -4.42E-07 -4.54E-08 S13 -5.28E+01 -6.20E-04 3.34E-05 -6.61E-07 -2.29E-08 S15 -1.62E+00 -6.28E-06 -2.03E-06 1.55E-07 -8.99E-09 S16 1.31E+01 2.59E-04 3.84E-06 -4.43E-08 1.57E-09 S22 -2.13E+01 1.62E-04 7.49E-06 -2.68E-07 3.02E-09 S23 6.76E+00 4.22E-06 1.31E-05 -6.74E-07 1.33E-08 S24 -4.88E+01 -1.21E-05 -2.39E-07 -1.10E-08 -1.68E-09 S25 6.55E-01 3.77E-05 -2.45E-07 5.46E-09 1.88E-09 S28 -6.25E+01 -4.04E-03 1.58E-04 -5.49E-06 8.14E-08 S29 -2.25E+01 -3.08E-03 1.30E-04 -4.26E-06 6.25E-08 S30 4.83E+00 -3.39E-04 1.80E-05 -2.89E-07 9.06E-09 S31 -3.51E+01 -7.74E-04 2.67E-05 -3.72E-07 5.10E-09 In this embodiment, TTL=45.91mm, fw=20mm, ft=55mm, ft / fw=2.75; Where fw is the focal length of the zoom lens in wide-angle mode, ft is the focal length of the zoom lens in telephoto mode, and TTL is the total optical length of the zoom lens.

[0090] Umin = 3000mm; Wherein, Umin is the minimum object distance of the zoom lens.

[0091] DSI=26.99mm, DSI / TTL=0.588; Wherein, DSI is the distance between the aperture stop STO and the image plane.

[0092] fG3=14.96, fG3 / fw=0.748; Where fG3 is the focal length of the second fixed lens group G3.

[0093] SG2 = 7.72 mm; SG5max=9.61mm, SG5max / SG2=1.24; SG4max=3.18mm, SG4max / SG2=0.41; Wherein, SG2 is the moving distance of the first zoom lens group G2, SG4max is the maximum moving distance of the second zoom lens group G4, and SG5max is the maximum moving distance of the focusing lens group G5.

[0094] XG5=0.2mm, XG5 / SG5max=0.021; Wherein, XG5 is the moving distance of the focusing lens group G5 when adjusting the object distance.

[0095] DG5=6.23mm, DG5 / fw=0.311; fG5 = -15.68, fG5 / fw = -0.784; Wherein, DG5 is the total optical length of the focusing lens group G5, and fG5 is the focal length of the focusing lens group G5. Example

[0096] A type of drone, 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.

[0097] 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 first fixed lens group with positive optical power, a first zoom lens group with negative optical power, a second fixed lens group with positive optical power, a second zoom lens group with positive optical power, a focusing lens group with negative optical power, and a third fixed lens group with positive optical power. The first zoom lens group, the second zoom lens group, and the focusing lens group move along the principal optical axis of the zoom lens; The first zoom lens group, the second zoom lens group, and the focusing lens group are all used to adjust the image distance of the zoom lens; The focusing lens group is also used to adjust the object distance of the zoom lens; The first fixed lens group consists of a first fixed lens with negative optical power, a second fixed lens with positive optical power, and a third fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side. The first fixed lens and the second fixed lens are cemented together. The first zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens with negative optical power, a third zoom lens with positive optical power, and a fourth zoom lens with negative optical power, from the object plane side to the image plane side. The second zoom lens and the third zoom lens are cemented together. The second fixed lens group is a fourth fixed lens with positive optical power; The second zoom lens group consists of a fifth zoom lens with negative optical power and a sixth zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side. The fifth zoom lens and the sixth zoom lens are cemented together. The focusing lens group consists of a first focusing lens with positive optical power, a second focusing lens with negative optical power, a third focusing lens with negative optical power, and a fourth focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side. The third fixed lens is a fifth fixed lens with positive optical power; The zoom lens satisfies the following condition: TTL < 50mm; fw > 18mm; Where fw is the focal length of the zoom lens in wide-angle mode, and TTL is the total optical length of the zoom lens.

2. A zoom lens according to claim 1, characterized in that: The zoom lens also includes an aperture stop, which is disposed on the object plane side or image plane side of the second fixed lens group.

3. A zoom lens according to claim 1, characterized in that: The first zoom lens group, the second zoom lens group, and the focusing lens group all contain aspherical lenses.

4. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 2000mm < Umin < 4000mm; Wherein, Umin is the minimum object distance of the zoom lens.

5. A zoom lens according to claim 2, characterized in that: The zoom lens satisfies the following condition: 0.5 < DSI / TTL < 0.6; Wherein, DSI is the distance between the aperture stop and the image plane.

6. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 0.65 < fG3 / fw < 0.8; Where fG3 is the focal length of the second fixed lens group.

7. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: SG5max / SG2 > 0.8; SG4max / SG2 < 0.5; Wherein, SG2 is the moving distance of the first zoom lens group, SG4max is the maximum moving distance of the second zoom lens group, and SG5max is the maximum moving distance of the focusing lens group.

8. A zoom lens according to claim 7, characterized in that: The focusing lens group is also used to adjust the object distance; XG5 / SG5max < 0.03; Wherein, XG5 is the moving distance of the focusing lens group when adjusting the object distance.

9. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: DG5 / fw < 0.4; -0.8 < fG5 / fw < -0.6; Wherein, DG5 is the total optical length of the focusing lens group, and fG5 is the focal length of the focusing lens group.

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

Images