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 fixed lens group with positive focal length, a variable magnification lens group with negative focal length, a second fixed lens group with positive focal length, a focusing lens group with negative focal length and an auxiliary lens group from the object side to the image side. The zoom lens satisfies the following conditional expressions: ΦA1 / TTL>0.45; ΦC1 / TTL>0.28; wherein ΦA1 is the outer diameter of the lens closest to the object side in the first fixed lens group, ΦC1 is the outer diameter of the lens closest to the object side in the second fixed lens group, and TTL is the total optical length of the zoom lens. The outer diameter of the first fixed lens group and the second fixed lens group is greatly increased, the effect of a large aperture of the zoom lens is achieved, the total optical length of the zoom lens is reduced, the small size of the zoom lens is achieved, and the application range of the zoom lens is increased.

Description

Technical Field

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

[0002] A zoom lens is a camera lens that can change its focal length within a certain range to obtain different widths of field of view, different sizes of images, and different ranges of scenery.

[0003] Currently, conventional zoom lenses typically have a thicker lens barrel to achieve a large aperture. At the same time, to improve the image quality of zoom lenses, the overall length of the lens is increased to a considerable extent. However, for some scenarios where size is a major concern, such lenses are not suitable. Summary of the Invention

[0004] This invention solves the existing technical problems by providing a zoom lens and imaging device, which greatly increases the outer diameter of the first fixed lens group and the second fixed lens group, achieving the effect of a large aperture zoom lens, while also reducing the overall optical length of the zoom lens, achieving a small size zoom lens, and increasing the applicability of the zoom lens.

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

[0006] A zoom lens, wherein the zoom lens comprises, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a zoom lens group with negative optical power, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, and an auxiliary lens group.

[0007] The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens;

[0008] The zoom lens is also equipped with an aperture stop, and the distance between the aperture stop and the first fixed lens group is fixed.

[0009] The zoom lens satisfies the following condition:

[0010] ΦA1 / TTL>0.45;

[0011] ΦC1 / TTL>0.28;

[0012] Wherein, ΦA1 is the outer diameter of the lens closest to the object surface in the first fixed lens group, ΦC1 is the outer diameter of the lens closest to the object surface in the second fixed lens group, and TTL is the total optical length of the zoom lens.

[0013] In this technical solution, by limiting the structure and parameters described above, the outer diameter of the first fixed lens group and the second fixed lens group is greatly increased, achieving the effect of a large aperture zoom lens. At the same time, the overall optical length of the zoom lens can be reduced, achieving a small size zoom lens and increasing the applicability of the zoom lens.

[0014] Preferably, the aperture stop is disposed between the zoom lens group and the second fixed lens group.

[0015] 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.

[0016] Preferably, the 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; the second zoom lens and the third zoom lens are cemented together.

[0017] Preferably, the focusing lens group is a lens with negative optical power.

[0018] Preferably, the auxiliary lens group consists of a first auxiliary lens with positive optical power and a second auxiliary lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0019] Preferably, the second fixed lens group includes, from the object plane side to the image plane side, a fourth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, and an eighth fixed lens with positive optical power.

[0020] Preferably, the second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens with negative optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, an eighth fixed lens with positive optical power, and a ninth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0021] Preferably, the second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, and an eighth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0022] Preferably, the second fixed lens group consists of a fourth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, an eighth fixed lens with positive optical power, and a ninth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0023] Preferably, the optical power of the auxiliary lens group is negative.

[0024] Preferably, the zoom lens satisfies the following condition:

[0025] ft / fw > 2.3;

[0026] Wherein, 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.

[0027] In this technical solution, the lens is further limited by defining the focal length in telephoto mode and the focal length in wide-angle mode.

[0028] Preferably, the zoom lens satisfies the following condition:

[0029] ΦAmin / TTL>0.4;

[0030] Wherein, ΦAmin is the outer diameter of the lens with the smallest outer diameter in the first fixed lens group.

[0031] In this technical solution, by limiting the outer diameter of the lens with the smallest outer diameter in the first fixed lens group, the volume of the first fixed lens is limited. This also facilitates the adjustment of the optical path of the zoom lens within the first fixed lens group, reduces the generation of chromatic aberration and coma within the zoom lens, and increases the imaging quality of the zoom lens.

[0032] Preferably, the zoom lens satisfies the following condition:

[0033] ΦCmax / TTL>0.28;

[0034] Wherein, ΦCmax is the outer diameter of the lens with the largest outer diameter in the second fixed lens group.

[0035] In this technical solution, limiting the outer diameter of the lens with the largest outer diameter in the second fixed lens group helps to achieve the effect of a large aperture for the zoom lens, while also correcting chromatic aberration and aberration in the wide-angle state of the zoom lens to a certain extent.

[0036] Preferably, the zoom lens satisfies the following condition:

[0037] Fnow < 1.1;

[0038] Fnot < 1.15;

[0039] Wherein, Fnow is the aperture number of the zoom lens in wide-angle mode, and Fnot is the aperture number of the zoom lens in telephoto mode.

[0040] In this technical solution, by limiting the above parameters, the aperture number of the zoom lens is effectively limited, thus achieving the effect of a large aperture for the zoom lens.

[0041] 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.

[0042] Compared with the prior art, the zoom lens and imaging device provided by the present invention have the following beneficial effects:

[0043] 1. By limiting the structure and parameters described above, the outer diameter of the first fixed lens group and the second fixed lens group is greatly increased, achieving the effect of a large aperture for the zoom lens. At the same time, the overall optical length of the zoom lens can be reduced, resulting in a smaller size and increasing the applicability of the zoom lens.

[0044] 2. By limiting the outer diameter of the lens with the smallest outer diameter in the first fixed lens group, the volume of the first fixed lens is limited. This also facilitates the adjustment of the optical path of the zoom lens within the first fixed lens group, reduces the generation of chromatic aberration and coma within the zoom lens, and increases the imaging quality of the zoom lens.

[0045] 3. By limiting the outer diameter of the lens with the largest outer diameter in the second fixed lens group, it is beneficial to achieve the effect of a large aperture in a zoom lens, while also correcting chromatic aberration and aberration in the wide-angle state of the zoom lens to a certain extent. Attached Figure Description

[0046] 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.

[0047] Figure 1 This is a schematic diagram of the structure of a zoom lens according to the present invention;

[0048] Figure 2 This is an aberration diagram of a zoom lens in telephoto mode according to the present invention;

[0049] Figure 3 This is an aberration diagram of a zoom lens in a wide-angle state according to the present invention;

[0050] Figure 4 This is a schematic diagram of another zoom lens according to the present invention;

[0051] Figure 5 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention;

[0052] Figure 6 This is another aberration diagram of the zoom lens in the wide-angle state according to the present invention;

[0053] Figure 7 This is a schematic diagram of the structure of another zoom lens of the present invention;

[0054] Figure 8This is another aberration diagram of the zoom lens in telephoto mode according to the present invention;

[0055] Figure 9 This is another aberration diagram of a zoom lens in a wide-angle state according to the present invention;

[0056] Figure 10 This is a schematic diagram of the structure of another zoom lens of the present invention;

[0057] Figure 11 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention;

[0058] Figure 12 This is another aberration diagram of a zoom lens in a wide-angle state according to the present invention.

[0059] Explanation of reference numerals: G1, First fixed lens group; G2, Zoom lens group; G3, Second fixed lens group; G4, Focusing lens group; G5, Auxiliary lens group; G6, Auxiliary component; a1, First fixed lens; a2, Second fixed lens; a3, Third fixed lens; a4, Fourth fixed lens; a5, Fifth fixed lens; a6, Sixth fixed lens; a7, Seventh fixed lens; a8, Eighth fixed lens; a9, Ninth fixed lens; b1, First zoom lens; b2, Second zoom lens; b3, Third zoom lens; b4, Fourth zoom lens; c1, First focusing lens; d1, First auxiliary lens; d2, Second auxiliary lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation

[0060] 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.

[0061] 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 1

[0062] A zoom lens, wherein the zoom lens comprises, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a zoom lens group with negative optical power, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, and an auxiliary lens group.

[0063] The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens;

[0064] The zoom lens is also equipped with an aperture stop, and the distance between the aperture stop and the first fixed lens group is fixed.

[0065] The zoom lens satisfies the following condition:

[0066] ΦA1 / TTL>0.45;

[0067] ΦC1 / TTL>0.28;

[0068] Wherein, ΦA1 is the outer diameter of the lens closest to the object surface in the first fixed lens group, ΦC1 is the outer diameter of the lens closest to the object surface in the second fixed lens group, and TTL is the total optical length of the zoom lens.

[0069] In this embodiment, by limiting the structure and parameters described above, the outer diameter of the first fixed lens group and the second fixed lens group is greatly increased, achieving the effect of a large aperture for the zoom lens. At the same time, the overall optical length of the zoom lens can be reduced, resulting in a smaller size for the zoom lens and increasing its applicability.

[0070] The aperture stop is positioned between the zoom lens group and the second fixed lens group.

[0071] 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.

[0072] The 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; the second zoom lens and the third zoom lens are cemented together.

[0073] The focusing lens group is a lens with negative optical power.

[0074] The auxiliary lens group consists of a first auxiliary lens with positive optical power and a second auxiliary lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0075] The second fixed lens group, from the object plane side to the image plane side, includes a fourth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, and an eighth fixed lens with positive optical power. The auxiliary lens group has negative optical power.

[0076] The second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens with negative optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, an eighth fixed lens with positive optical power, and a ninth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0077] The second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, and an eighth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0078] The second fixed lens group consists of a fourth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, an eighth fixed lens with positive optical power, and a ninth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0079] The zoom lens satisfies the following condition:

[0080] ft / fw > 2.3;

[0081] Wherein, 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.

[0082] By limiting the focal length in telephoto and wide-angle modes, the limitations of the lens are further realized.

[0083] The zoom lens satisfies the following condition:

[0084] ΦAmin / TTL>0.4;

[0085] Wherein, ΦAmin is the outer diameter of the lens with the smallest outer diameter in the first fixed lens group.

[0086] By limiting the outer diameter of the lens with the smallest outer diameter in the first fixed lens group, the volume of the first fixed lens is limited. This also facilitates the adjustment of the optical path of the zoom lens within the first fixed lens group, reduces the generation of chromatic aberration and coma within the zoom lens, and increases the imaging quality of the zoom lens.

[0087] The zoom lens satisfies the following condition:

[0088] ΦCmax / TTL>0.28;

[0089] Wherein, ΦCmax is the outer diameter of the lens with the largest outer diameter in the second fixed lens group.

[0090] By limiting the outer diameter of the lens with the largest outer diameter in the second fixed lens group, it is beneficial to achieve the effect of a large aperture in a zoom lens, while also being able to correct chromatic aberration and aberration in the wide-angle state of the zoom lens to a certain extent.

[0091] The zoom lens satisfies the following condition:

[0092] Fnow < 1.1;

[0093] Fnot < 1.15;

[0094] Wherein, Fnow is the aperture number of the zoom lens in wide-angle mode, and Fnot is the aperture number of the zoom lens in telephoto mode.

[0095] By limiting the parameters mentioned above, the aperture number of the zoom lens is effectively limited, thus achieving the effect of a large aperture for the zoom lens. Example 2

[0096] A zoom lens, wherein the zoom lens comprises, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture stop, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, an auxiliary lens group and auxiliary components.

[0097] The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens;

[0098] 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.

[0099] The 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; the second zoom lens and the third zoom lens are cemented together.

[0100] The second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens with negative optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, an eighth fixed lens with positive optical power, and a ninth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0101] The focusing lens group is a lens with negative optical power.

[0102] The auxiliary lens group consists of a first auxiliary lens with positive optical power and a second auxiliary lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0103] The auxiliary component is a protective glass.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0108] Table 1

[0109] Face number Surface type radius of curvature / mm Center thickness / mm Refractive index Abbe number OBJ S1 spherical 44.22 1.00 1.95 17.98 S2 spherical 30.76 4.44 1.59 61.25 S3 spherical -156.12 0.10 　 S4 spherical 18.86 3.89 1.50 81.61 S5 spherical 81.02 D1 　 S6 aspherical 34.60 0.65 1.69 31.08 S7 aspherical 9.99 3.42 　 S8 spherical -22.81 0.65 1.49 70.42 S9 spherical 12.35 2.17 1.95 17.98 S10 spherical 36.78 2.06 　 S11 aspherical -13.53 0.65 1.58 59.46 S12 aspherical 1284.95 D2 　 STO spherical INF 0.94 　 S14 aspherical 14.59 3.29 1.81 40.73 S15 aspherical -48.85 0.10 　 S16 spherical 19.78 0.65 1.65 33.84 S17 spherical 9.95 4.18 1.50 81.61 S18 spherical -31.18 0.10 　 S19 spherical -63.13 0.65 1.67 32.18 S20 spherical 9.97 3.27 1.59 68.34 S21 spherical -41.36 0.10 　 S22 aspherical 17.11 2.19 1.54 55.71 S23 aspherical -47.33 D3 　 S24 spherical 31.36 0.65 1.61 44.17 S25 spherical 6.43 D4 　 S26 spherical 124.39 1.72 2.00 25.43 S27 spherical -18.61 0.22 　 S28 aspherical 7.65 0.88 1.63 23.98 S29 aspherical 5.65 2.56 　 S30 spherical INF 0.80 1.52 64.17 S31 spherical INF 0.00 　 IMG

[0110] Table 2

[0111] WIDE TELE D1 0.70 8.10 D2 7.55 0.15 D3 0.70 0.77 D4 3.02 2.95

[0112] Table 3

[0113] Quadratic surface constant (K) 4th order coefficients (A) 6th order coefficients (B) 8th order coefficients (C) 10th-order coefficients (D) S6 -1.03E-02 1.23E-05 -6.51E-08 2.90E-09 -3.43E-11 S7 1.51E-01 -1.65E-06 -3.25E-08 1.12E-08 -3.61E-10 S11 -5.50E-01 3.67E-05 3.04E-07 -8.25E-08 1.56E-09 S12 2.84E+04 7.94E-05 -2.11E-06 3.09E-08 -1.84E-10 S14 -3.16E-02 -6.51E-05 3.86E-07 -1.39E-09 -2.70E-11 S15 2.49E+01 7.37E-05 6.34E-07 -1.78E-09 2.00E-12 S22 1.71E+00 -5.70E-04 -5.68E-06 4.05E-08 -7.51E-09 S23 -3.89E+01 -6.33E-04 5.79E-06 -1.82E-07 -2.47E-09 S28 -3.72E+00 -3.54E-03 -1.45E-05 1.37E-06 -1.27E-08 S29 -1.98E+00 -4.35E-03 1.66E-05 -3.89E-07 1.14E-07

[0114] In this embodiment, fw=11.5mm, ft=26.95mm, ft / fw=2.34, Fnow=1.07, Fnot=1.12, TTL=53.3mm;

[0115] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, Fnow is the aperture number of the zoom lens in wide-angle mode, Fnot is the aperture number of the zoom lens in telephoto mode, and TTL is the total optical length of the zoom lens.

[0116] ΦA1=27.25mm, ΦA1 / TTL=0.511;

[0117] ΦC1=15.9mm, ΦC1 / TTL=0.298;

[0118] Wherein, ΦA1 is the outer diameter of the lens closest to the object surface in the first fixed lens group, ΦC1 is the outer diameter of the lens closest to the object surface in the second fixed lens group, and TTL is the total optical length of the zoom lens.

[0119] ΦAmin=ΦA3=22.15mm, ΦAmin / TTL=0.416;

[0120] ΦCmax=ΦC1=15.9mm, ΦCmax / TTL=0.298;

[0121] Wherein, ΦAmin is the outer diameter of the lens with the smallest outer diameter in the first fixed lens group, and ΦCmax is the outer diameter of the lens with the largest outer diameter in the second fixed lens group. Example 3

[0122] A zoom lens, wherein the zoom lens comprises, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture stop, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, an auxiliary lens group and auxiliary components.

[0123] The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens;

[0124] 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.

[0125] The 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; the second zoom lens and the third zoom lens are cemented together.

[0126] The second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, and an eighth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0127] The focusing lens group is a lens with negative optical power.

[0128] The auxiliary lens group consists of a first auxiliary lens with positive optical power and a second auxiliary lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0129] The auxiliary component is a protective glass.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] In Table 6, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0134] Table 4

[0135] Face number Surface type radius of curvature / mm Center thickness / mm Refractive index Abbe number OBJ S1 spherical 36.57 1.00 1.95 17.98 S2 spherical 30.59 5.07 1.50 81.61 S3 spherical -110.80 0.10 　 S4 spherical 16.40 4.26 1.50 81.61 S5 spherical 44.86 D1 　 S6 aspherical 31.52 0.65 1.69 31.08 S7 aspherical 8.53 3.61 　 S8 spherical -25.57 0.65 1.55 45.83 S9 spherical 11.10 2.63 1.95 17.98 S10 spherical 63.35 2.40 　 S11 aspherical -13.96 0.65 1.69 53.20 S12 aspherical 225.84 D2 　 STO spherical INF 0.29 　 S14 aspherical 16.46 3.09 1.69 53.20 S15 aspherical -34.67 0.10 　 S16 spherical 14.66 4.24 1.50 81.59 S17 spherical -22.20 0.10 　 S18 spherical 18.67 2.66 1.77 49.60 S19 spherical -26.73 0.65 1.81 22.69 S20 spherical 8.97 0.80 　 S21 aspherical 17.41 1.59 1.54 55.71 S22 aspherical 117.35 D3 　 S23 spherical 59.58 0.65 1.53 55.47 S24 spherical 10.07 D4 　 S25 spherical 19.51 2.03 1.91 35.26 S26 spherical -32.62 0.52 　 S27 aspherical 9.98 0.95 1.63 23.98 S28 aspherical 7.37 2.46 　 S29 spherical INF 0.80 1.52 64.17 S30 spherical INF 0.00 　 IMG

[0136] Table 5

[0137] WIDE TELE D1 0.70 7.25 D2 7.46 0.90 D3 0.70 0.80 D4 2.49 2.39

[0138] Table 6

[0139] Quadratic surface constant (K) 4th order coefficients (A) 6th order coefficients (B) 8th order coefficients (C) 10th-order coefficients (D) S6 -2.06E+00 -9.16E-06 -2.54E-07 -1.52E-09 1.39E-11 S7 -3.23E-02 -1.34E-05 -2.42E-07 -5.89E-09 -2.42E-10 S11 -4.34E-01 2.03E-05 1.26E-06 -6.92E-09 -4.41E-10 S12 1.00E+03 3.90E-05 -2.60E-07 -2.01E-10 -1.96E-11 S14 -4.99E-01 -8.02E-05 7.30E-07 -4.90E-09 -1.48E-12 S15 -6.89E+00 5.95E-05 8.20E-07 -2.95E-09 3.01E-11 S21 4.39E+00 -2.99E-04 1.45E-05 2.85E-07 -8.41E-09 S22 8.00E+01 -2.11E-04 2.46E-05 1.57E-07 3.60E-09 S27 2.48E+00 -3.70E-03 8.34E-06 -3.73E-07 -3.24E-08 S28 6.52E-01 -4.35E-03 1.72E-05 -1.39E-06 7.46E-08

[0140] In this embodiment, fw=11.5mm, ft=27.08mm, ft / fw=2.35, Fnow=1.07, Fnot=1.12, TTL=53.3mm;

[0141] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, Fnow is the aperture number of the zoom lens in wide-angle mode, Fnot is the aperture number of the zoom lens in telephoto mode, and TTL is the total optical length of the zoom lens.

[0142] ΦA1=27mm, ΦA1 / TTL=0.507;

[0143] ΦC1=15.21mm, ΦC1 / TTL=0.285;

[0144] Wherein, ΦA1 is the outer diameter of the lens closest to the object surface in the first fixed lens group, ΦC1 is the outer diameter of the lens closest to the object surface in the second fixed lens group, and TTL is the total optical length of the zoom lens.

[0145] ΦAmin=ΦA3=22.6mm, ΦAmin / TTL=0.422;

[0146] ΦCmax=ΦC1=15.21mm, ΦCmax / TTL=0.285;

[0147] Wherein, ΦAmin is the outer diameter of the lens with the smallest outer diameter in the first fixed lens group, and ΦCmax is the outer diameter of the lens with the largest outer diameter in the second fixed lens group. Example 4

[0148] A zoom lens, wherein the zoom lens comprises, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture stop, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, an auxiliary lens group and auxiliary components.

[0149] The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens;

[0150] 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.

[0151] The 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; the second zoom lens and the third zoom lens are cemented together.

[0152] The second fixed lens group includes, from the object plane side to the image plane side, a fourth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, and an eighth fixed lens with positive optical power.

[0153] The focusing lens group is a lens with negative optical power.

[0154] The auxiliary lens group consists of a first auxiliary lens with positive optical power and a second auxiliary lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0155] The auxiliary component is a protective glass.

[0156] The basic lens data of the zoom lens in this embodiment is shown in Table 7, the variable parameters in Table 7 are shown in Table 8, and the aspherical coefficients are shown in Table 9.

[0157] 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.

[0158] In Table 8, 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.

[0159] In Table 9, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0160] Table 7

[0161] Face number Surface type radius of curvature / mm Center thickness / mm Refractive index Abbe number OBJ S1 spherical 28.93 0.85 1.95 17.98 S2 spherical 21.90 3.32 1.77 49.60 S3 spherical 55.76 0.12 　 S4 spherical 22.89 3.16 1.50 81.61 S5 spherical 136.52 D1 　 S6 aspherical -34.15 0.60 1.59 61.16 S7 aspherical 12.27 2.80 　 S8 spherical -31.26 0.60 1.50 81.61 S9 spherical 15.21 2.90 1.95 17.94 S10 spherical -194.63 1.33 　 S11 spherical -19.97 0.60 1.83 42.73 S12 spherical 55760.96 D2 　 STO spherical INF 1.10 　 S14 aspherical 13.12 5.12 1.50 81.56 S15 aspherical -28.77 0.10 　 S16 spherical 14.85 3.88 1.50 81.61 S17 spherical -61.50 0.10 　 S18 spherical 24.90 0.60 1.70 30.05 S19 spherical 6.75 4.96 1.59 68.62 S20 spherical 2428.10 D3 　 S21 aspherical 40.53 0.60 1.58 59.46 S22 aspherical 11.12 D4 　 S23 aspherical -11080.41 1.22 1.54 55.99 S24 aspherical -17.87 0.13 　 S25 aspherical 15.77 1.83 1.66 20.37 S26 aspherical 8.39 2.49 　 S27 spherical INF 0.80 1.52 64.21 S28 spherical INF 0.00 　 IMG

[0162] Table 8

[0163] WIDE TELE D1 0.82 9.99 D2 9.38 0.21 D3 0.70 1.32 D4 3.22 2.59

[0164] Table 9

[0165] Quadratic surface constant (K) 4th order coefficients (A) 6th order coefficients (B) 8th order coefficients (C) 10th-order coefficients (D) S6 -1.39E+02 1.47E-04 -5.38E-06 5.00E-08 6.35E-10 S7 5.83E-01 5.08E-04 -1.74E-05 2.54E-07 -6.96E-10 S14 -1.86E-01 -8.08E-05 2.64E-07 -8.21E-09 1.66E-10 S15 5.96E+00 1.01E-04 2.67E-07 -5.84E-09 1.83E-10 S21 -7.84E+01 1.22E-04 6.09E-07 -1.02E-07 8.79E-09 S22 -5.58E-01 -8.77E-05 7.76E-06 -7.26E-07 5.04E-08 S23 8.00E+01 1.03E-03 -4.51E-05 1.55E-06 -1.35E-07 S24 -4.27E+00 2.19E-03 -7.72E-05 4.04E-06 -3.16E-07 S25 -2.53E+01 -1.07E-03 -6.76E-06 2.08E-07 -8.40E-08 S26 -9.09E+00 -1.59E-03 2.32E-05 -1.93E-06 5.33E-08

[0166] In this embodiment, fw=11.5mm, ft=27.07mm, ft / fw=2.35, Fnow=1.08, Fnot=1.12, TTL=53.3mm;

[0167] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, Fnow is the aperture number of the zoom lens in wide-angle mode, Fnot is the aperture number of the zoom lens in telephoto mode, and TTL is the total optical length of the zoom lens.

[0168] ΦA1=25.04mm, ΦA1 / TTL=0.47;

[0169] ΦC1=18.4mm, ΦC1 / TTL=0.345;

[0170] Wherein, ΦA1 is the outer diameter of the lens closest to the object surface in the first fixed lens group, ΦC1 is the outer diameter of the lens closest to the object surface in the second fixed lens group, and TTL is the total optical length of the zoom lens.

[0171] ΦAmin=ΦA3=22.66mm, ΦAmin / TTL=0.425;

[0172] ΦCmax=ΦC1=18.4mm, ΦCmax / TTL=0.345;

[0173] Wherein, ΦAmin is the outer diameter of the lens with the smallest outer diameter in the first fixed lens group, and ΦCmax is the outer diameter of the lens with the largest outer diameter in the second fixed lens group. Example 5

[0174] A zoom lens, wherein the zoom lens comprises, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture stop, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, an auxiliary lens group and auxiliary components.

[0175] The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens;

[0176] 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.

[0177] The 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; the second zoom lens and the third zoom lens are cemented together.

[0178] The second fixed lens group consists of a fourth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, an eighth fixed lens with positive optical power, and a ninth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0179] The focusing lens group is a lens with negative optical power.

[0180] The auxiliary lens group consists of a first auxiliary lens with positive optical power and a second auxiliary lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0181] The auxiliary component is a protective glass.

[0182] The basic lens data of the zoom lens in this embodiment is shown in Table 10, the variable parameters in Table 10 are shown in Table 11, and the aspherical coefficients are shown in Table 12.

[0183] 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.

[0184] In Table 11, 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.

[0185] In Table 12, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0186] Table 10

[0187] Face number Surface type radius of curvature / mm Center thickness / mm Refractive index Abbe number OBJ S1 spherical 29.27 0.85 1.95 17.94 S2 spherical 21.82 4.56 1.62 63.88 S3 spherical -188.90 0.12 　 S4 spherical 20.33 3.06 1.50 81.59 S5 spherical 48.82 D1 　 S6 aspherical 25.09 0.70 1.69 31.08 S7 aspherical 8.60 3.72 　 S8 spherical -16.21 0.60 1.60 60.63 S9 spherical 16.85 2.32 1.95 17.94 S10 spherical -51.17 1.32 　 S11 aspherical -14.24 0.70 1.77 49.60 S12 aspherical 201.54 D2 　 STO spherical INF 0.73 　 S14 aspherical 13.49 4.83 1.81 40.73 S15 aspherical -25.51 0.10 　 S16 spherical 16.77 3.23 1.50 81.61 S17 spherical -46.22 0.60 1.75 25.05 S18 spherical 7.90 3.35 1.50 81.61 S19 spherical -85.99 0.10 　 S20 aspherical 48.19 1.65 1.54 55.99 S21 aspherical -32.47 D3 　 S22 spherical 67.93 0.50 1.74 44.93 S23 spherical 8.72 D4 　 S24 spherical 12.98 3.33 2.00 28.32 S25 spherical -21.06 0.25 　 S26 aspherical 15.80 1.06 1.66 20.37 S27 aspherical 6.02 2.74 　 S28 spherical INF 0.80 1.52 64.21 S29 spherical INF 0.00 　 IMG

[0188] Table 11

[0189] WIDE TELE D1 0.82 7.93 D2 7.68 0.57 D3 0.82 1.2 D4 2.76 2.38

[0190] Table 12

[0191] Quadratic surface constant (K) 4th order coefficients (A) 6th order coefficients (B) 8th order coefficients (C) 10th-order coefficients (D) S6 2.67E+00 3.69E-05 -1.42E-09 7.97E-09 -5.60E-11 S7 7.21E-01 -9.50E-05 -1.29E-06 -5.55E-08 8.96E-10 S11 2.37E-01 -2.24E-05 7.98E-08 3.49E-08 -5.19E-10 S12 2.38E-01 -6.91E-05 5.46E-07 6.79E-10 -2.27E-10 S14 8.18E-02 -5.78E-05 1.91E-07 -5.26E-09 1.85E-10 S15 5.33E+00 1.56E-04 -5.53E-08 1.98E-09 1.10E-10 S20 3.29E+01 -1.67E-04 -3.38E-06 2.05E-07 -9.70E-09 S21 2.71E+01 -1.06E-04 6.50E-06 6.25E-08 -6.49E-09 S26 -3.26E+01 -3.11E-03 8.37E-05 4.11E-07 -1.14E-07 S27 -2.16E+00 -4.01E-03 1.59E-04 -4.12E-06 1.84E-08

[0192] In this embodiment, fw=11.5mm, ft=27.08mm, ft / fw=2.35, Fnow=1.07, Fnot=1.12, TTL=53.3mm;

[0193] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, Fnow is the aperture number of the zoom lens in wide-angle mode, Fnot is the aperture number of the zoom lens in telephoto mode, and TTL is the total optical length of the zoom lens.

[0194] ΦA1=25.89mm, ΦA1 / TTL=0.486;

[0195] ΦC1=16.4mm, ΦC1 / TTL=0.308;

[0196] Wherein, ΦA1 is the outer diameter of the lens closest to the object surface in the first fixed lens group, ΦC1 is the outer diameter of the lens closest to the object surface in the second fixed lens group, and TTL is the total optical length of the zoom lens.

[0197] ΦAmin=ΦA3=21.7mm, ΦAmin / TTL=0.407;

[0198] ΦCmax=ΦC1=16.4mm, ΦCmax / TTL=0.308;

[0199] Wherein, ΦAmin is the outer diameter of the lens with the smallest outer diameter in the first fixed lens group, and ΦCmax is the outer diameter of the lens with the largest outer diameter in the second fixed lens group. Example 6

[0200] An imaging device, such as Figures 1 to 12 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.

[0201] 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 zoom lens group with negative optical power, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, and an auxiliary lens group. The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens; The zoom lens is also equipped with an aperture stop, and the distance between the aperture stop and the first fixed lens group is fixed. 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, sequentially from the object plane side to the image plane side. The 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; the second zoom lens and the third zoom lens are cemented together. The focusing lens group is a single lens with negative optical power; The auxiliary lens group consists of a first auxiliary lens with positive optical power and a second auxiliary lens with negative optical power, arranged sequentially from the object plane side to the image plane side. The zoom lens satisfies the following condition: ΦA1 / TTL>0.45; ΦC1 / TTL>0.28; Wherein, ΦA1 is the outer diameter of the lens closest to the object surface in the first fixed lens group, ΦC1 is the outer diameter of the lens closest to the object surface in the second fixed lens group, and TTL is the total optical length of the zoom lens.

2. A zoom lens according to claim 1, characterized in that: The aperture stop is positioned between the zoom lens group and the second fixed lens group.

3. A zoom lens according to claim 1, characterized in that: The second fixed lens group includes, from the object plane side to the image plane side, a fourth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, and an eighth fixed lens with positive optical power.

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

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

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

7. A zoom lens according to claim 1, characterized in that: The optical power of the auxiliary lens group is negative.

8. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: ft / fw > 2.3; Wherein, 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.

9. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: ΦAmin / TTL>0.4; Wherein, ΦAmin is the outer diameter of the lens with the smallest outer diameter in the first fixed lens group.

10. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: ΦCmax / TTL>0.28; Wherein, ΦCmax is the outer diameter of the lens with the largest outer diameter in the second fixed lens group.

11. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: Fnow < 1.1; Fnot < 1.15; Wherein, Fnow is the aperture number of the zoom lens in wide-angle mode, and Fnot is the aperture number of the zoom lens in telephoto mode.

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

Images