Zoom lens and imaging device

Abstract

The invention relates to the field of optics, in particular to a zoom lens and an imaging device. The zoom lens is sequentially composed of a first 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 diaphragm, a focusing lens group with negative focal power, a fixed anti-shake lens group with negative focal power and an auxiliary zoom lens group with positive focal power from the object plane side to the image plane side. Each of the first zoom lens group, the second zoom lens group and the auxiliary zoom lens group comprises at most one aspheric lens; through a multi-group linkage mode, large-magnification zooming of the zoom lens is realized, miniaturization of the zoom lens is realized at the same time, the zoom lens is convenient to carry, the possibility of shaking the zoom lens by a worker is reduced, the setting of the fixed anti-shake lens group further reduces the possibility of image shaking after the worker shakes the zoom lens, and the working efficiency is improved. And the imaging stability of the zoom lens is improved.

Description

Technical Field

[0001] The present invention relates to the field of optics, and particularly to a zoom lens and an imaging device. Background Art

[0002] A zoom lens is a lens that can change the focal length within a certain range, thereby obtaining different field angles of view with different widths, different sizes of images, and different ranges of scenes. Without changing the shooting distance, the zoom lens can change the shooting range by changing the focal length, so it is very beneficial for picture composition.

[0003] Currently, existing ultra-high magnification zoom lenses are usually used in scenarios such as forest fire prevention where the requirements for the size and volume of the lens are relatively small. Due to the extremely long imaging distance of high magnification zoom lenses, the requirements for the placement of the lens are relatively high. And for large-sized zoom lenses, due to their relatively large mass, the requirements for the fixing bracket of the lens are extremely high, and there are also relatively high requirements for the placement location of the fixing bracket. Therefore, how to achieve stable imaging of high magnification zoom lenses has become an urgent problem to be solved. Summary of the Invention

[0004] The present invention will solve the existing technical problems, and provide a zoom lens and an imaging device. Through the multi-group linkage method, high magnification zoom of the zoom lens is achieved, and at the same time, miniaturization of the zoom lens is realized, which is convenient for carrying the zoom lens, reduces the possibility of the operator shaking the zoom lens, and the setting of the fixed anti-shake lens group further reduces the possibility of image jitter after the operator shakes the zoom lens, and increases the stability of the zoom lens imaging.

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

[0006] A zoom lens, which successively consists of a first fixed lens group with positive optical power, a first variable magnification lens group with negative optical power, a second variable magnification lens group with positive optical power, a diaphragm, a focusing lens group with negative optical power, a fixed anti-shake lens group with negative optical power, and an auxiliary variable magnification lens group with positive optical power from the object side to the image side; the first variable magnification lens group, the second variable magnification lens group, the focusing lens group, and the auxiliary variable magnification lens group move along the main optical axis direction of the zoom lens; the first fixed lens group, the first variable magnification lens group, the second variable magnification lens group, and the auxiliary variable magnification lens group each at least include a group of cemented lenses; the first variable magnification lens group, the second variable magnification lens group, and the auxiliary variable magnification lens group each at most include one aspherical lens; the focusing lens group is a focusing lens with negative optical power; the fixed anti-shake lens group successively consists of a first anti-shake lens and a second anti-shake lens from the object side to the image side, and the first anti-shake lens and the second anti-shake lens are cemented.

[0007] The zoom lens satisfies the following conditional expressions: ft / fw > 80; TTL / ft < 0.4; where ft is the focal length of the zoom lens in the telephoto state, fw is the focal length of the zoom lens in the wide-angle state, and TTL is the overall optical length of the zoom lens.

[0008] In this technical solution, large-magnification zoom of the zoom lens is achieved through the multi-group linkage method, and at the same time, miniaturization of the zoom lens is realized, which is convenient for carrying the zoom lens, reduces the possibility of the operator shaking the zoom lens, and the setting of the fixed anti-shake lens group further reduces the possibility of image jitter after the operator shakes the zoom lens, increasing the imaging stability of the zoom lens.

[0009] Preferably, the first fixed lens group is composed 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, a fourth fixed lens with positive optical power, a fifth fixed lens with negative optical power, and a sixth fixed lens with positive optical power in sequence from the object side to the image side; among them, the first fixed lens and the second fixed lens are cemented, and the fifth fixed lens and the sixth fixed lens are cemented.

[0010] Preferably, the first varifocal lens group is composed of a first varifocal lens with negative optical power, a second varifocal lens with negative optical power, a third varifocal lens with positive optical power, a fourth varifocal lens with negative optical power, and a fifth varifocal lens with positive optical power in sequence from the object side to the image side; among them, the third varifocal lens, the fourth varifocal lens, and the fifth varifocal lens together form a triple cemented lens.

[0011] Preferably, the second varifocal lens group is composed of a sixth varifocal lens with positive optical power, a seventh varifocal lens with positive optical power, an eighth varifocal lens with negative optical power, and a ninth varifocal lens with positive optical power in sequence from the object side to the image side; among them, the eighth varifocal lens and the ninth varifocal lens are cemented.

[0012] Preferably, the auxiliary varifocal lens group is composed of a first auxiliary lens with positive optical power, a second auxiliary lens with negative optical power, and a third auxiliary lens with positive optical power in sequence from the object side to the image side; the second auxiliary lens and the third auxiliary lens are cemented.

[0013] Preferably, the zoom lens satisfies the following conditional expressions:

[0014] XG2 / TTL > 0.28;

[0015] where XG2 is the maximum moving distance of the first varifocal lens.

[0016] In this technical solution, by increasing the moving distance of the first varifocal lens, the possibility of large-magnification zoom of the zoom lens is achieved, and at the same time, the possibility of the zoom lens having an overly large volume is reduced, realizing miniaturization of the zoom lens.

[0017] Preferably, the zoom lens satisfies the following conditional formula:

[0018] 0.3 < XG3 / XG2 < 0.35;

[0019] 0.7 < XG6 / XG3 < 0.75;

[0020] Wherein, XG3 is the maximum moving distance of the second varifocal lens, and XG6 is the maximum moving distance of the auxiliary varifocal lens.

[0021] In this technical solution, by limiting the moving distances of the second varifocal lens and the auxiliary varifocal lens, the resolving power of the zoom lens is increased, and at the same time, the possibility of the zoom lens having an excessive volume is reduced.

[0022] Preferably, the first auxiliary lens satisfies the following conditional formula:

[0023] De1 / fw > 0.5;

[0024] Wherein, De1 is the thickness of the first auxiliary lens.

[0025] In this technical solution, by limiting the thickness of the first auxiliary lens, the possibility of the auxiliary varifocal lens group having an excessive volume is reduced, the length of the rear group of the zoom lens is reduced, and the mass distribution of the zoom lens is optimized.

[0026] Preferably, the seventh varifocal lens satisfies the following conditional formula:

[0027] Db7 / DG3 > 0.3;

[0028] Wherein, Db7 is the thickness of the seventh varifocal lens, and DG3 is the total optical length of the second varifocal lens group.

[0029] In this technical solution, by providing the seventh varifocal lens, the possibility of aberration and coma generated during the zooming process of the zoom lens is reduced, and the resolving power of the zoom lens is increased.

[0030] Preferably, the zoom lens satisfies the following conditional formula:

[0031] -4 < fG4 / fw < -2;

[0032] -20 < fG5 / fw < -10;

[0033] Wherein, fG4 is the focal length of the focusing lens group, and fG5 is the focal length of the fixed anti-shake lens group.

[0034] In this technical solution, by defining the focusing lens group and the focal length of the fixed anti-shake lens group, the focal lengths of each lens group in the zoom lens are optimized, the possibility of aberration and coma in the zoom lens is reduced, and the resolution of the zoom lens is increased.

[0035] One of the objectives of the present invention is also to provide an imaging device, including: a zoom lens; and an imaging element configured to receive an image formed by the zoom lens.

[0036] Compared with the prior art, a zoom lens and an imaging device provided by the present invention have the following beneficial effects:

[0037] 1. By means of multi-group linkage, large-magnification zoom of the zoom lens is achieved, and at the same time, miniaturization of the zoom lens is realized, which is convenient for carrying the zoom lens, reduces the possibility of the operator shaking the zoom lens, and the setting of the fixed anti-shake lens group further reduces the possibility of image jitter after the operator shakes the zoom lens, increasing the imaging stability of the zoom lens.

[0038] 2. By increasing the moving distance of the first variable magnification lens, the possibility of large-magnification zoom of the zoom lens is achieved, and at the same time, the possibility of the zoom lens having an overly large volume is reduced, realizing miniaturization of the zoom lens.

[0039] 3. By defining the moving distances of the second variable magnification lens and the auxiliary variable magnification lens, the resolution of the zoom lens is increased, and at the same time, the possibility of the zoom lens having an overly large volume is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above characteristics, technical features, advantages and their implementation manners of a zoom lens and an imaging device will be further described below in a clear and understandable manner in conjunction with the drawings in the preferred embodiments.

[0041] Figure 1 is a schematic structural diagram of a zoom lens of the present invention;

[0042] Figure 2 is an aberration diagram of a zoom lens of the present invention in the telephoto state;

[0043] Figure 3 is an aberration diagram of a zoom lens of the present invention in the wide-angle state;

[0044] Figure 4 is a first coma diagram of a zoom lens of the present invention in the telephoto state;

[0045] Figure 5 is a second coma diagram of a zoom lens of the present invention in the telephoto state;

[0046] Figure 6 is a first coma diagram of a zoom lens of the present invention in the wide-angle state;

[0047] Figure 7 It is the second coma diagram of the wide-angle state of a zoom lens according to the present invention;

[0048] Figure 8 It is a schematic structural diagram of another zoom lens according to the present invention;

[0049] Figure 9 It is the aberration diagram of the telephoto state of another zoom lens according to the present invention;

[0050] Figure 10 It is the aberration diagram of the wide-angle state of another zoom lens according to the present invention;

[0051] Figure 11 It is the first coma diagram of the telephoto state of another zoom lens according to the present invention;

[0052] Figure 12 It is the second coma diagram of the telephoto state of another zoom lens according to the present invention;

[0053] Figure 13 It is the first coma diagram of the wide-angle state of another zoom lens according to the present invention;

[0054] Figure 14 It is the second coma diagram of the wide-angle state of another zoom lens according to the present invention.

[0055] Explanation of the reference numerals in the drawings: G1, the first fixed lens group; G2, the first variable magnification lens group; G3, the second variable magnification lens group; G4, the focusing lens group; G5, the fixed anti-shake lens group; G6, the auxiliary variable magnification lens group; G7, the auxiliary component; a1, the first fixed lens; a2, the second fixed lens; a3, the third fixed lens; a4, the fourth fixed lens; a5, the fifth fixed lens; a6, the sixth fixed lens; b1, the first variable magnification lens; b2, the second variable magnification lens; b3, the third variable magnification lens; b4, the fourth variable magnification lens; b5, the fifth variable magnification lens; b6, the sixth variable magnification lens; b7, the seventh variable magnification lens; b8, the eighth variable magnification lens; b9, the ninth variable magnification lens; c1, the first focusing lens; d1, the first anti-shake lens; d2, the second anti-shake lens; e1, the first auxiliary lens; e2, the second auxiliary lens; e3, the third auxiliary lens; STO, the aperture stop; CG, the protective glass. Detailed implementation manners

[0056] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0057] For the sake of simplicity of the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product as a whole. Additionally, for the sake of simplicity and easy understanding of the drawings, among the parts with the same structure or function in some figures, only one of them is schematically illustrated, or only one of them is labeled. In this article, "one" not only means "only this one", but also can represent the case of "more than one".

[0058] Embodiment 1

[0059] As Figure 1 and Figure 8 shown, a zoom lens, which successively consists of a first fixed lens group G1 with positive optical power, a first variable magnification lens group G2 with negative optical power, a second variable magnification lens group G3 with positive optical power, a diaphragm STO, a focusing lens group G4 with negative optical power, a fixed anti-shake lens group G5 with negative optical power, and an auxiliary variable magnification lens group G6 with positive optical power from the object side to the image side;

[0060] The first variable magnification lens group G2, the second variable magnification lens group G3, the focusing lens group G4, and the auxiliary variable magnification lens group G6 move along the principal optical axis direction of the zoom lens;

[0061] The first fixed lens group G1, the first variable magnification lens group G2, the second variable magnification lens group G3, and the auxiliary variable magnification lens group G6 all include at least one cemented lens;

[0062] The first variable magnification lens group G2, the second variable magnification lens group G3, and the auxiliary variable magnification lens group G6 all include at most one aspherical lens;

[0063] The focusing lens group G4 is a first focusing lens c1 with negative optical power;

[0064] The fixed anti-shake lens group G5 successively consists of a first anti-shake lens d1 and a second anti-shake lens d2 from the object side to the image side, and the first anti-shake lens d1 and the second anti-shake lens d2 are cemented;

[0065] The zoom lens satisfies the following conditional expressions:

[0066] ft / fw>80;

[0067] TTL / ft<0.4;

[0068] wherein, ft is the focal length of the zoom lens in the telephoto state, fw is the focal length of the zoom lens in the wide-angle state, and TTL is the overall optical length of the zoom lens.

[0069] In this embodiment, large - magnification zoom of the zoom lens is achieved through the multi - group linkage method. At the same time, the miniaturization of the zoom lens is realized, which is convenient for carrying the zoom lens, reduces the possibility of the operator shaking the zoom lens, and the setting of the fixed anti - shake lens group G5 further reduces the possibility of image jitter after the operator shakes the zoom lens, increasing the imaging stability of the zoom lens.

[0070] The first fixed lens group G1 is composed 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, a fourth fixed lens a4 with positive optical power, a fifth fixed lens a5 with negative optical power, and a sixth fixed lens a6 with positive optical power in sequence from the object - side to the image - side; among them, the first fixed lens a1 and the second fixed lens a2 are cemented, and the fifth fixed lens a5 and the sixth fixed lens a6 are cemented.

[0071] The first variable - magnification lens group G2 is composed of a first variable - magnification lens b1 with negative optical power, a second variable - magnification lens b2 with negative optical power, a third variable - magnification lens b3 with positive optical power, a fourth variable - magnification lens b4 with negative optical power, and a fifth variable - magnification lens b5 with positive optical power in sequence from the object - side to the image - side; among them, the third variable - magnification lens b3, the fourth variable - magnification lens b4, and the fifth variable - magnification lens b5 jointly form a triple - cemented lens.

[0072] The second variable - magnification lens group G3 is composed of a sixth variable - magnification lens b6 with positive optical power, a seventh variable - magnification lens b7 with positive optical power, an eighth variable - magnification lens b8 with negative optical power, and a ninth variable - magnification lens b9 with positive optical power in sequence from the object - side to the image - side; among them, the eighth variable - magnification lens b8 and the ninth variable - magnification lens b9 are cemented.

[0073] The auxiliary variable - magnification lens group G6 is composed of a first auxiliary lens e1 with positive optical power, a second auxiliary lens e2 with negative optical power, and a third auxiliary lens e3 with positive optical power in sequence from the object - side to the image - side; the second auxiliary lens e2 and the third auxiliary lens e3 are cemented.

[0074] The zoom lens satisfies the following conditional formula:

[0075] XG2 / TTL>0.28;

[0076] Wherein, XG2 is the maximum moving distance of the first variable - magnification lens b1.

[0077] In this embodiment, by increasing the moving distance of the first variable - magnification lens b1, the possibility of large - magnification zoom of the zoom lens is achieved, and at the same time, the possibility of the zoom lens having an overly large volume is reduced, realizing the miniaturization of the zoom lens.

[0078] The zoom lens satisfies the following conditional formula:

[0079] 0.3 < XG3 / XG2 < 0.35;

[0080] 0.7 < XG6 / XG3 < 0.75;

[0081] Wherein, XG3 is the maximum moving distance of the second variable magnification lens b2, and XG6 is the maximum moving distance of the auxiliary variable magnification lens.

[0082] In this embodiment, by limiting the moving distances of the second variable magnification lens b2 and the auxiliary variable magnification lens, the resolving power of the zoom lens is increased, and at the same time, the possibility of the zoom lens having an excessive volume is reduced.

[0083] The first auxiliary lens e1 satisfies the following conditional formula:

[0084] De1 / fw > 0.5;

[0085] Wherein, De1 is the thickness of the first auxiliary lens e1.

[0086] In this embodiment, by limiting the thickness of the first auxiliary lens e1, the possibility of the auxiliary variable magnification lens group G6 having an excessive volume is reduced, the length of the rear group of the zoom lens is reduced, and the mass distribution of the zoom lens is optimized.

[0087] The seventh variable magnification lens b7 satisfies the following conditional formula:

[0088] Db7 / DG3 > 0.3;

[0089] Wherein, Db7 is the thickness of the seventh variable magnification lens b7, and DG3 is the total optical length of the second variable magnification lens group G3.

[0090] In this embodiment, by providing the seventh variable magnification lens b7, the possibility of aberration and coma generated during the zooming process of the zoom lens is reduced, and the resolving power of the zoom lens is increased.

[0091] The zoom lens satisfies the following conditional formula:

[0092] -4 < fG4 / fw < -2;

[0093] -20 < fG5 / fw < -10;

[0094] Wherein, fG4 is the focal length of the focusing lens group G4, and fG5 is the focal length of the fixed anti-shake lens group G5.

[0095] In this embodiment, by limiting the focal lengths of the focusing lens group G4 and the fixed anti-shake lens group G5, the focal lengths of the respective lens groups within the zoom lens are optimized, the possibility of aberration and coma generated by the zoom lens is reduced, and the resolving power of the zoom lens is increased.

[0096] Embodiment 2

[0097] As Figures 1 to 7 shown, a zoom lens is composed of a first fixed lens group G1 with positive refractive power, a first variable magnification lens group G2 with negative refractive power, a second variable magnification lens group G3 with positive refractive power, a stop STO, a focusing lens group G4 with negative refractive power, a fixed anti-shake lens group G5 with negative refractive power, an auxiliary variable magnification lens group G6 with positive refractive power, and an auxiliary component G7, in sequence from the object plane side to the image plane side;

[0098] The first variable magnification lens group G2, the second variable magnification lens group G3, the focusing lens group G4, and the auxiliary variable magnification lens group G6 move along the principal optical axis direction of the zoom lens;

[0099] The first fixed lens group G1, the first variable magnification lens group G2, the second variable magnification lens group G3, and the auxiliary variable magnification lens group G6 each include at least one cemented lens;

[0100] The first variable magnification lens group G2, the second variable magnification lens group G3, and the auxiliary variable magnification lens group G6 each include at most one aspherical lens;

[0101] The first fixed lens group G1 is composed of a first fixed lens a1 with positive refractive power, a second fixed lens a2 with negative refractive power, a third fixed lens a3 with positive refractive power, a fourth fixed lens a4 with positive refractive power, a fifth fixed lens a5 with negative refractive power, and a sixth fixed lens a6 with positive refractive power, in sequence from the object plane side to the image plane side; among them, the first fixed lens a1 and the second fixed lens a2 are cemented, and the fifth fixed lens a5 and the sixth fixed lens a6 are cemented.

[0102] The first variable magnification lens group G2 is composed of a first variable magnification lens b1 with negative refractive power, a second variable magnification lens b2 with negative refractive power, a third variable magnification lens b3 with positive refractive power, a fourth variable magnification lens b4 with negative refractive power, and a fifth variable magnification lens b5 with positive refractive power, in sequence from the object plane side to the image plane side; among them, the third variable magnification lens b3, the fourth variable magnification lens b4, and the fifth variable magnification lens b5 together form a triple cemented lens.

[0103] The second variable magnification lens group G3 is composed of a sixth variable magnification lens b6 with positive refractive power, a seventh variable magnification lens b7 with positive refractive power, an eighth variable magnification lens b8 with negative refractive power, and a ninth variable magnification lens b9 with positive refractive power; among them, the eighth variable magnification lens b8 and the ninth variable magnification lens b9 are cemented.

[0104] The focusing lens group G4 is a first focusing lens c1 with negative refractive power;

[0105] The fixed anti-shake lens group G5 is composed of a first anti-shake lens d1 and a second anti-shake lens d2, in sequence from the object plane side to the image plane side, and the first anti-shake lens d1 and the second anti-shake lens d2 are cemented;

[0106] The auxiliary variable magnification lens group G6 is composed of a first auxiliary lens e1 with positive optical power, a second auxiliary lens e2 with negative optical power, and a third auxiliary lens e3 with positive optical power in sequence from the object side to the image side; the second auxiliary lens e2 and the third auxiliary lens e3 are cemented together.

[0107] The auxiliary component G7 is a piece of protective glass CG.

[0108] The basic lens data of the zoom lens in this embodiment is shown in Table 1, the variable parameters in Table 1 are shown in Table 2, and the aspheric coefficients are shown in Table 3.

[0109] In the surface number column, the surface numbers are shown when the surface on the object side is set as the first surface and the numbers increase one by one towards the image side; in the surface type column, the surface type of a certain lens is shown; in the radius of curvature column, the radius of curvature of a certain lens is shown. When the radius of curvature is positive, it indicates that the surface is curved towards the object side, and when the radius of curvature is negative, it indicates that the surface is curved towards the image side; in the center thickness column, the axial surface interval between each surface and the adjacent surface on its image side is shown; in the refractive index column, the refractive index of a certain lens is shown; in the Abbe number column, the Abbe number of a certain lens is shown.

[0110] In Table 2, the WIDE column represents the specific values of each variable parameter when the zoom lens is in the wide-angle end state, and the TELE column represents the specific values of each variable parameter when the zoom lens is in the telephoto end state.

[0111] In Table 3, K is the conic coefficient, e is the scientific notation symbol. For example, e-05 represents 10 -5 .

[0112]

Table 1

[0113]

[0114]

[0115]

[0116]

Table 2

[0117] Wide TELE D1 3.5 115.27 D2 151.83 3.34 D3 3.5 40.22 D4 5.94 5.73 D5 6.8 7.01 D6 38.76 64.99 D7 28.66 2.44

[0118]

Table 3

[0119]

[0120] In this embodiment, fw = 11mm, ft = 920mm, ft / fw = 83.6, TTL = 366mm, TTL / ft = 0.398; fno = 2.32 - 8.58;

[0121] Among them, ft is the focal length of the telephoto state of the zoom lens, fw is the focal length of the wide-angle state of the zoom lens, TTL is the overall optical length of the zoom lens, and fno is the aperture number of the zoom lens.

[0122] XG2 = 111.77 mm, XG3 = 36.72 mm, XG6 = 26.23 mm;

[0123] XG2 / TTL = 0.305, XG3 / XG2 = 0.329, XG6 / XG3 = 0.714;

[0124] Among them, XG2 is the maximum moving distance of the first variable-power lens b1, XG3 is the maximum moving distance of the second variable-power lens b2, and XG6 is the maximum moving distance of the auxiliary variable-power lens.

[0125] De1 = 5.69 mm; De1 / fw = 0.517;

[0126] Among them, De1 is the thickness of the first auxiliary lens e1.

[0127] Db7 = 6.62 mm, DG3 = 19.52 mm, Db7 / DG3 = 0.339;

[0128] Among them, Db7 is the thickness of the seventh variable-power lens b7, and DG3 is the overall optical length of the second variable-power lens group G3.

[0129] fG4 = -32.97 mm, fG5 = -216.93 mm; fG4 / fw = -3, fG5 / fw = -19.72;

[0130] Among them, fG4 is the focal length of the focusing lens group G4, and fG5 is the focal length of the fixed anti-shake lens group G5.

[0131] Embodiment 3

[0132] As Figures 8 to 14 shown, a zoom lens, which is composed of a first fixed lens group G1 with positive optical power, a first variable-power lens group G2 with negative optical power, a second variable-power lens group G3 with positive optical power, a diaphragm STO, a focusing lens group G4 with negative optical power, a fixed anti-shake lens group G5 with negative optical power, an auxiliary variable-power lens group G6 with positive optical power, and an auxiliary component G7 from the object side to the image side in sequence;

[0133] The first variable-power lens group G2, the second variable-power lens group G3, the focusing lens group G4, and the auxiliary variable-power lens group G6 move along the principal optical axis direction of the zoom lens;

[0134] The first fixed lens group G1, the first varifocal lens group G2, the second varifocal lens group G3, and the auxiliary varifocal lens group G6 each include at least one cemented lens;

[0135] The first varifocal lens group G2, the second varifocal lens group G3, and the auxiliary varifocal lens group G6 each include at most one aspherical lens;

[0136] It is composed of a first fixed lens a1, a second fixed lens a2 with negative optical power, a third fixed lens a3 with positive optical power, a fourth fixed lens a4 with positive optical power, a fifth fixed lens a5 with negative optical power, and a sixth fixed lens a6 with positive optical power; among them, the first fixed lens a1 and the second fixed lens a2 are cemented, and the fifth fixed lens a5 and the sixth fixed lens a6 are cemented.

[0137] The first varifocal lens group G2 is successively composed of a first varifocal lens b1 with negative optical power, a second varifocal lens b2 with negative optical power, a third varifocal lens b3 with positive optical power, a fourth varifocal lens b4 with negative optical power, and a fifth varifocal lens b5 with positive optical power from the object side to the image side; among them, the third varifocal lens b3, the fourth varifocal lens b4, and the fifth varifocal lens b5 together form a triple cemented lens.

[0138] The second varifocal lens group G3 is successively composed of a sixth varifocal lens b6 with positive optical power, a seventh varifocal lens b7 with positive optical power, an eighth varifocal lens b8 with negative optical power, and a ninth varifocal lens b9 with positive optical power from the object side to the image side; among them, the eighth varifocal lens b8 and the ninth varifocal lens b9 are cemented.

[0139] The focusing lens group G4 is a focusing lens with negative optical power;

[0140] The fixed anti-shake lens group G5 is successively composed of a first anti-shake lens d1 and a second anti-shake lens d2 from the object side to the image side, and the first anti-shake lens d1 and the second anti-shake lens d2 are cemented;

[0141] The first fixed lens group G1 is successively composed of a lens with positive optical power from the object side to the image side

[0142] The auxiliary varifocal lens group G6 is successively composed of a first auxiliary lens e1 with positive optical power, a second auxiliary lens e2 with negative optical power, and a third auxiliary lens e3 with positive optical power from the object side to the image side; the second auxiliary lens e2 and the third auxiliary lens e3 are cemented.

[0143] The auxiliary component G7 is a protective glass CG.

[0144] The basic lens data of the zoom lens in this embodiment are shown in Table 4, the variable parameters in Table 4 are shown in Table 5, and the aspherical coefficients are shown in Table 6.

[0145] The surface numbers are shown in the surface number column when the object-side surface is set as the first surface and the numbers increase successively towards the image side; the surface types of a certain lens are shown in the surface type column; the curvature radii of a certain lens are shown in the curvature radius column. When the curvature radius is positive, it indicates that the surface bends towards the object side, and when the curvature radius is negative, it indicates that the surface bends towards the image side; the axial surface intervals between each surface and the adjacent surface on its image side are shown in the center thickness column; the refractive indices of a certain lens are shown in the refractive index column; the Abbe numbers of a certain lens are shown in the Abbe number column.

[0146] In Table 5, the WIDE column represents the specific values of each variable parameter when the zoom lens is in the wide-angle end state, and the TELE column represents the specific values of each variable parameter when the zoom lens is in the telephoto end state.

[0147] In Table 6, K is the conic coefficient, e is the scientific notation symbol. For example, e-05 represents 10 -5 。

[0148]

Table 1

[0149]

[0150]

[0151]

Table 5

[0152] Wide TELE D1 7.73 115.35 D2 148.48 3.34 D3 3.5 41.03 D4 8.59 5.49 D5 5.72 8.81 D6 16.12 44.09 D7 30.5 2.53

[0153]

Table 6

[0154]

[0155] In this embodiment, fw = 11 mm, ft = 920 mm, ft / fw = 83.6, TTL = 364.43 mm, TTL / ft = 0.396; fno = 2.17 - 8.56;

[0156] Wherein, ft is the focal length of the zoom lens in the telephoto state, fw is the focal length of the zoom lens in the wide-angle state, TTL is the overall optical length of the zoom lens, and fno is the aperture number of the zoom lens.

[0157] XG2 = 107.62 mm, XG3 = 37.52 mm, XG6 = 27.97 mm;

[0158] XG2 / TTL = 0.295, XG3 / XG2 = 0.349, XG6 / XG3 = 0.745;

[0159] Wherein, XG2 is the maximum moving distance of the first variable magnification lens b1, XG3 is the maximum moving distance of the second variable magnification lens b2, and XG6 is the maximum moving distance of the auxiliary variable magnification lens.

[0160] De1 = 14.49 mm; De1 / fw = 1.317;

[0161] Wherein, De1 is the thickness of the first auxiliary lens e1.

[0162] Db7 = 11.58 mm, DG3 = 22.78 mm, Db7 / DG3 = 0.508;

[0163] Wherein, Db7 is the thickness of the seventh variable magnification lens b7, and DG3 is the total optical length of the second variable magnification lens group G3.

[0164] fG4 = -23.32 mm, fG5 = -141.43 mm; fG4 / fw = -2.12, fG5 / fw = -12.86;

[0165] Wherein, fG4 is the focal length of the focusing lens group G4, and fG5 is the focal length of the fixed anti-shake lens group G5.

[0166] Embodiment 4

[0167] An imaging device, as Figures 1 to 14 shown, comprising: a zoom lens described in any of the above embodiments, and an imaging element configured to receive an image formed by the zoom lens.

[0168] It should be noted that the above embodiments can be freely combined as needed. The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A zoom lens, characterized in that: The zoom lens is composed of a first fixed lens group with positive optical power, a first variable magnification lens group with negative optical power, a second variable magnification lens group with positive optical power, an aperture, a focusing lens group with negative optical power, a fixed anti-shake lens group with negative optical power, and an auxiliary variable magnification lens group with positive optical power in order from the object plane side to the image plane side; The first variator lens group, the second variator lens group, the focusing lens group, and the auxiliary variator lens group move along the main optical axis of the zoom lens; The first fixed lens group, the first variable-power lens group, the second variable-power lens group and the auxiliary variable-power lens group each include at least one set of cemented lenses; The first zoom lens group, the second zoom lens group and the auxiliary zoom lens group each include at most one aspherical lens; The focusing lens group is a focusing lens with negative focal power; The fixed anti-shake lens group is composed of a first anti-shake lens and a second anti-shake lens in sequence from the object plane side to the image plane side, and the first anti-shake lens and the second anti-shake lens are glued together; The zoom lens satisfies the following conditional formula: ft / fw>80; TTL / ft<0.4; Wherein, ft is the focal length of the zoom lens in the telephoto state, fw is the focal length of the zoom lens in the wide-angle state, and TTL is the total optical length of the zoom lens.

2. The zoom lens according to claim 1, characterized in that: The first fixed lens group is composed 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, a fourth fixed lens with positive optical power, a fifth fixed lens with negative optical power, and a sixth fixed lens with positive optical power from the object plane side to the image plane side; wherein the first fixed lens and the second fixed lens are glued together, and the fifth fixed lens and the sixth fixed lens are glued together.

3. The zoom lens according to claim 1, characterized in that: The first zoom lens group is composed 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, a fourth zoom lens with negative optical power, and a fifth zoom lens with positive optical power from the object side to the image side; wherein the third zoom lens, the fourth zoom lens, and the fifth zoom lens together constitute a triplet lens.

4. The zoom lens according to claim 1, characterized in that: The second zoom lens group is composed of a sixth zoom lens with positive focal power, a seventh zoom lens with positive focal power, an eighth zoom lens with negative focal power, and a ninth zoom lens with positive focal power from the object plane side to the image plane side; wherein the eighth zoom lens and the ninth zoom lens are cemented together.

5. The zoom lens according to claim 1, characterized in that: The auxiliary variable power lens group is composed of a first auxiliary lens with positive focal length, a second auxiliary lens with negative focal length, and a third auxiliary lens with positive focal length from the object plane side to the image plane side; the second auxiliary lens and the third auxiliary lens are glued together.

6. The zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following conditional formula: 0.28<XG2 / TTL<0.32; Wherein, XG2 is the maximum moving distance of the first zoom lens.

7. The zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following conditional formula: 0.3<XG3 / XG2<0.35; 0.7<XG6 / XG3<0.75; Among them, XG3 is the maximum moving distance of the second variator lens, and XG6 is the maximum moving distance of the auxiliary variator lens.

8. The zoom lens according to claim 5, characterized in that: The first auxiliary lens satisfies the following conditional formula: De1 / fw>0.5; Wherein, De1 is the thickness of the first auxiliary lens.

9. The zoom lens according to claim 4, characterized in that: The seventh variable magnification lens satisfies the following conditional formula: Db7 / DG3>0.3; Wherein, Db7 is the thickness of the seventh variator lens, and DG3 is the total optical length of the second variator lens group.

10. The zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following conditional formula: -4<fG4 / fw<-2; -20<fG5 / fw<-10; Among them, fG4 is the focal length of the focusing lens group, and fG5 is the focal length of the fixed anti-shake lens group.

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

Images