Zoom lens and imaging device

Abstract

This invention relates to the field of optics, specifically to a zoom lens and an imaging device. The zoom lens, from the object plane side to the image plane side, consists of 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 a third fixed lens group with positive optical power. The second fixed lens group includes two sets of cemented lenses; the third fixed lens group includes at least one lens with positive optical power. The zoom lens satisfies the following conditions: ft / fw > 20; TTL < 100mm; 2 < fG5 / fw < 3. By limiting the focal length of the third fixed lens group and the internal lenses, the third fixed lens group can effectively correct chromatic aberration and aberrations of the preceding lens groups, thus increasing the imaging quality of the zoom lens.

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, thereby obtaining different widths of field of view, different image sizes, and different ranges of scenery. A zoom lens can change the shooting range by changing the focal length without changing the shooting distance, which is very beneficial for image composition. Since a zoom lens can perform the function of several prime lenses, it not only reduces the amount of photography equipment needed when traveling but also saves time changing lenses.

[0003] Existing zoom lenses are usually quite large in size during use, and miniaturization of zoom lenses is the current general trend in the lens industry. However, for zoom lenses with high magnification and miniaturization, there is a problem of lower image quality. Summary of the Invention

[0004] This invention addresses existing technical problems by providing a zoom lens and imaging device. By using multiple sets of cemented doublet lenses, the number of lenses used in the zoom lens is reduced, lowering the cost of the zoom lens and achieving miniaturization. Simultaneously, by limiting the focal length of the third fixed lens group and the internal lenses, the third fixed lens group can effectively correct the chromatic aberration and aberration of the previous group, thereby increasing the imaging quality 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 a third fixed lens group with positive optical power.

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

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

[0009] 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.

[0010] The focusing lens group consists of a first focusing lens with positive optical power and a second focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side, and the first focusing lens and the second focusing lens are cemented together.

[0011] The second fixed lens group includes two sets of cemented lenses;

[0012] The third fixed lens group includes at least one lens with positive optical power;

[0013] The zoom lens satisfies the following condition:

[0014] ft / fw > 20;

[0015] TTL < 100mm;

[0016] 2 < fG5 / fw < 3;

[0017] 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, TTL is the total optical length of the zoom lens, and fG5 is the focal length of the third fixed lens group.

[0018] In this technical solution, by limiting the structure and parameters mentioned above and by setting multiple sets of cemented doublet lenses, the number of lenses used in the zoom lens is reduced, the cost of the zoom lens is reduced, and the miniaturization of the zoom lens is achieved. At the same time, by limiting the focal length of the third fixed lens group and the internal lenses, the third fixed lens group can effectively correct the chromatic aberration and aberration of the front group, thereby increasing the imaging quality of the zoom lens.

[0019] Preferably, the second fixed lens group consists of a fifth fixed lens with positive optical power, a sixth fixed lens with negative optical power, a seventh fixed lens with positive optical power, an eighth fixed lens with negative optical power, and a ninth fixed lens with positive optical power, from the object plane side to the image plane side. The sixth and seventh fixed lenses form a cemented doublet lens, and the eighth and ninth fixed lenses form a cemented doublet lens.

[0020] Preferably, the third fixed lens group consists of a tenth fixed lens with negative optical power and an eleventh fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side, and the tenth fixed lens and the eleventh fixed lens are cemented together.

[0021] Preferably, the third fixed lens group consists of a tenth fixed lens with positive optical power and an eleventh fixed lens with positive optical power, sequentially from the object plane side to the image plane side.

[0022] Preferably, both the zoom lens group and the second fixed lens group are provided with an aspherical lens.

[0023] This technical solution reduces the number of lenses in the zoom lens, thereby reducing the mass of the zoom lens. At the same time, it is beneficial to correct chromatic aberration and aberrations in the zoom lens, thus improving the imaging quality of the zoom lens.

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

[0025] 0.3 < XG2 / TTL < 0.35;

[0026] Wherein, XG2 is the moving distance of the zoom lens group.

[0027] In this technical solution, by limiting the moving distance of the zoom lens group, the effect of miniaturization of the zoom lens is achieved, while also achieving a large zoom ratio.

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

[0029] 0.1 < XG4 / XG2 < 0.2;

[0030] Wherein, XG4 is the moving distance of the focusing lens group.

[0031] In this technical solution, by limiting the above parameters, the zoom lens is miniaturized while improving the image quality of the zoom lens.

[0032] Preferably, the eleventh fixed lens satisfies the following condition:

[0033] 0.9<R112 / (R111+R112)<1.2;

[0034] Wherein, R111 is the radius of curvature of the eleventh fixed lens near the object plane, and R112 is the radius of curvature of the eleventh fixed lens near the image plane.

[0035] In this technical solution, by limiting the above parameters, the radius of curvature of the eleventh fixed lens near the image plane is greatly increased, the angle between the optical path and the principal optical axis is reduced, the dissipation of the optical path on the lens is reduced, and the brightness of the zoom lens is increased.

[0036] Preferably, each of the two sets of cemented lenses in the second fixed lens group satisfies one of the following conditions:

[0037] 4 < f1 / fw < 8;

[0038] 30 < f2 / fw < 35;

[0039] Where f1 and f2 are the focal lengths of the two cemented lenses in the second fixed lens group, respectively.

[0040] In this technical solution, by limiting the above parameters, the aberrations of the first lens group by the second fixed lens group are corrected, thereby increasing the imaging quality of 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 and by setting multiple sets of cemented doublet lenses, the number of lenses used in the zoom lens is reduced, the cost of the zoom lens is lowered, and the zoom lens is miniaturized. At the same time, by limiting the focal length of the third fixed lens group and the internal lenses, the third fixed lens group can effectively correct the chromatic aberration and aberration of the front group, thereby increasing the imaging quality of the zoom lens.

[0044] 2. The number of lenses inside the zoom lens is reduced, which in turn reduces the weight of the zoom lens. At the same time, it is beneficial to correct chromatic aberration and aberrations in the zoom lens, thus improving the image quality of the zoom lens.

[0045] 3. By limiting the parameters mentioned above, the radius of curvature of the eleventh fixed lens near the image plane is greatly increased, the angle between the optical path and the principal optical axis is reduced, the light dissipation on the lens is reduced, and the brightness of the zoom lens is increased. 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 invention relates to a coma diagram of a zoom lens in a wide-angle state.

[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 invention provides a coma diagram of a zoom lens in telephoto mode.

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

[0052] Figure 6 This is a schematic diagram of another zoom lens according to the present invention;

[0053] Figure 7 This is another coma diagram of the zoom lens in the wide-angle state according to the present invention;

[0054] Figure 8 This is another aberration diagram of the zoom lens in the wide-angle state according to the present invention;

[0055] Figure 9 This is another coma diagram of the zoom lens in telephoto mode according to the present invention;

[0056] Figure 10 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention.

[0057] Explanation of reference numerals: G1, First fixed lens group; G2, Zoom lens group; G3, Second fixed lens group; G4, Focusing lens group; G5, Third fixed 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; a10, Tenth fixed lens; a11, Eleventh fixed lens; b1, First zoom lens; b2, Second zoom lens; b3, Third zoom lens; b4, Fourth zoom lens; c1, First focusing lens; c2, Second focusing lens; d1, First auxiliary lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation

[0058] 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.

[0059] 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."

[0060] Example 1

[0061] like Figure 1 and Figure 6As shown, a zoom lens is composed of a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, and a third fixed lens group G5 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0062] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the zoom lens;

[0063] The first fixed lens group G1 consists of 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 a fourth fixed lens a4 with positive optical power, from the object plane side to the image plane side. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0064] The zoom lens group G2 consists of 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, arranged sequentially from the object plane side to the image plane side.

[0065] The focusing lens group G4 is composed of a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power, from the object plane side to the image plane side, and the first focusing lens c1 and the second focusing lens c2 are cemented together.

[0066] The second fixed lens group G3 contains two sets of cemented lenses;

[0067] The third fixed lens group G5 contains at least one lens with positive optical power;

[0068] The zoom lens satisfies the following condition:

[0069] ft / fw > 20;

[0070] TTL < 100mm;

[0071] 2 < fG5 / fw < 3;

[0072] 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, TTL is the total optical length of the zoom lens, and fG5 is the focal length of the third fixed lens group G5.

[0073] In this embodiment, by limiting the structure and parameters described above and by setting multiple sets of cemented doublet lenses, the number of lenses used in the zoom lens is reduced, the cost of the zoom lens is reduced, and the miniaturization of the zoom lens is achieved. At the same time, by limiting the focal length of the third fixed lens group G5 and the internal lenses, the third fixed lens group G5 can effectively correct the chromatic aberration and aberration of the front group, thereby increasing the imaging quality of the zoom lens.

[0074] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with negative optical power, a seventh fixed lens a7 with positive optical power, an eighth fixed lens a8 with negative optical power, and a ninth fixed lens a9 with positive optical power, from the object plane side to the image plane side. The sixth fixed lens a6 and the seventh fixed lens a7 form a cemented doublet, and the eighth fixed lens a8 and the ninth fixed lens a9 form a cemented doublet.

[0075] The third fixed lens group G5 consists of a tenth fixed lens a10 with negative optical power and an eleventh fixed lens a11 with positive optical power, arranged sequentially from the object plane side to the image plane side. The tenth fixed lens a10 and the eleventh fixed lens a11 are cemented together.

[0076] The third fixed lens group G5 consists of a tenth fixed lens a10 with positive optical power and an eleventh fixed lens a11 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0077] Both the zoom lens group G2 and the second fixed lens group G3 are equipped with an aspherical lens.

[0078] In this embodiment, the number of lenses in the zoom lens is reduced, thereby reducing the mass of the zoom lens. At the same time, it is beneficial to correct chromatic aberration and aberrations in the zoom lens, thus improving the imaging quality of the zoom lens.

[0079] The zoom lens satisfies the following condition:

[0080] 0.3 < XG2 / TTL < 0.35;

[0081] Wherein, XG2 is the moving distance of the zoom lens group G2.

[0082] In this embodiment, by limiting the moving distance of the zoom lens group G2, the effect of miniaturization of the zoom lens is achieved, while also achieving a large zoom ratio.

[0083] The zoom lens satisfies the following condition:

[0084] 0.1 < XG4 / XG2 < 0.2;

[0085] Wherein, XG4 is the moving distance of the focusing lens group G4.

[0086] By limiting the parameters mentioned above, the zoom lens can be miniaturized while improving its image quality.

[0087] The eleventh fixed lens a11 satisfies the following condition:

[0088] 0.9<R112 / (R111+R112)<1.2;

[0089] Wherein, R111 is the radius of curvature of the eleventh fixed lens a11 near the object plane, and R112 is the radius of curvature of the eleventh fixed lens a11 near the image plane.

[0090] By limiting the parameters mentioned above, the radius of curvature of the eleventh fixed lens a11 near the image plane is greatly increased, the angle between the optical path and the principal optical axis is reduced, the dissipation of the optical path on the lens is reduced, and the brightness of the zoom lens is increased.

[0091] The two sets of cemented lenses within the second fixed lens group G3 each satisfy one of the following conditions:

[0092] 4 < f1 / fw < 8;

[0093] 30 < f2 / fw < 35;

[0094] Where f1 and f2 are the focal lengths of the two sets of cemented lenses in the second fixed lens group G3, respectively.

[0095] By limiting the parameters mentioned above, the second fixed lens group G3 corrects the aberrations of the front group, thereby increasing the imaging quality of the zoom lens. In this embodiment, the sixth fixed lens a6 and the seventh fixed lens a7 form a cemented doublet, and the eighth fixed lens a8 and the ninth fixed lens a9 form a cemented doublet. One of the cemented doublets satisfies condition f1, and the other cemented doublet satisfies condition f2.

[0096] Example 2

[0097] like Figures 1 to 5 As shown, a zoom lens is composed of a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a third fixed lens group G5 with positive optical power, and an auxiliary component G6, arranged sequentially from the object plane side to the image plane side.

[0098] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the zoom lens;

[0099] The first fixed lens group G1 consists of 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 a fourth fixed lens a4 with positive optical power, from the object plane side to the image plane side. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0100] The zoom lens group G2 consists of 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, arranged sequentially from the object plane side to the image plane side.

[0101] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with negative optical power, a seventh fixed lens a7 with positive optical power, an eighth fixed lens a8 with negative optical power, and a ninth fixed lens a9 with positive optical power, from the object plane side to the image plane side. The sixth fixed lens a6 and the seventh fixed lens a7 form a cemented doublet, and the eighth fixed lens a8 and the ninth fixed lens a9 form a cemented doublet.

[0102] The focusing lens group G4 is composed of a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power, from the object plane side to the image plane side, and the first focusing lens c1 and the second focusing lens c2 are cemented together.

[0103] The third fixed lens group G5 consists of a tenth fixed lens a10 with negative optical power and an eleventh fixed lens a11 with positive optical power, arranged sequentially from the object plane side to the image plane side. The tenth fixed lens a10 and the eleventh fixed lens a11 are cemented together.

[0104] The auxiliary component G6 is a protective glass CG.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0109] Table 1

[0110]

[0111]

[0112] Table 2

[0113] WIDE TELE D1 0.5 30.95 D2 31.47 1.02 D3 0.7 5.3 D4 14.6 10

[0114] Table 3

[0115]

[0116] In this embodiment, fw = 5.3 mm, ft = 130 mm, ft / fw = 24.53, and TTL = 90.51 mm.

[0117] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, and TTL is the total optical length of the zoom lens.

[0118] fG5=14.37mm, fG5 / fw=2.71;

[0119] Wherein, fG5 is the focal length of the third fixed lens group G5.

[0120] XG2=30.45mm, XG4=4.6mm, XG2 / TTL=0.336, XG4 / XG2=0.15;

[0121] Wherein, XG2 is the moving distance of the zoom lens group G2, and XG4 is the moving distance of the focusing lens group G4.

[0122] R111=7.13mm, R112=82.96mm, R112 / (R111+R112)=0.921;

[0123] Wherein, R111 is the radius of curvature of the eleventh fixed lens a11 near the object plane, and R112 is the radius of curvature of the eleventh fixed lens a11 near the image plane.

[0124] f1=fa67=22.64mm; f2=fa89=175.54mm;

[0125] f1 / fw=4.27, f2 / fw=33.12;

[0126] Wherein, f1 and f2 are the focal lengths of the two cemented lenses in the second fixed lens group G3, respectively; fa67 is the combined focal length of the cemented doublet formed by the sixth fixed lens a6 and the seventh fixed lens a7, and fa89 is the combined focal length of the cemented doublet formed by the eighth fixed lens a8 and the ninth fixed lens a9.

[0127] Example 3

[0128] like Figures 6 to 10 As shown, a zoom lens is composed of a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a third fixed lens group G5 with positive optical power, and an auxiliary component G6, arranged sequentially from the object plane side to the image plane side.

[0129] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the zoom lens;

[0130] The first fixed lens group G1 consists of 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 a fourth fixed lens a4 with positive optical power, from the object plane side to the image plane side. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0131] The zoom lens group G2 consists of 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, arranged sequentially from the object plane side to the image plane side.

[0132] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with negative optical power, a seventh fixed lens a7 with positive optical power, an eighth fixed lens a8 with negative optical power, and a ninth fixed lens a9 with positive optical power, from the object plane side to the image plane side. The sixth fixed lens a6 and the seventh fixed lens a7 form a cemented doublet, and the eighth fixed lens a8 and the ninth fixed lens a9 form a cemented doublet.

[0133] The focusing lens group G4 is composed of a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power, from the object plane side to the image plane side, and the first focusing lens c1 and the second focusing lens c2 are cemented together.

[0134] The third fixed lens group G5 consists of a tenth fixed lens a10 with positive optical power and an eleventh fixed lens a11 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0135] The auxiliary component G6 is a protective glass CG.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] In Table 6, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0140] Table 4

[0141] Face number Surface type radius of curvature / mm Center thickness / mm Refractive index Abbe number OBJ S1 spherical 80.11 1.20 1.91 35.25 S2 spherical 39.08 5.85 1.44 94.58 S3 spherical -279.16 0.12 S4 spherical 36.30 4.73 1.44 94.58 S5 spherical -2349.30 0.10 S6 spherical 34.69 2.80 1.50 81.61 S7 spherical 83.79 D1 S8 aspherical 30.86 0.55 1.81 41.01 S9 aspherical 10.07 2.62 S10 spherical -20.43 0.55 1.77 49.62 S11 spherical 10.24 1.95 1.95 17.98 S12 spherical 50.12 1.17 S13 spherical -11.69 0.55 1.73 54.67 S14 spherical -38.95 D2 STO spherical INF 0.10 S16 aspherical 14.99 3.36 1.81 41.01 S17 aspherical -74.85 0.10 S18 spherical 215.06 0.55 1.65 39.55 S19 spherical 11.62 4.87 1.44 94.58 S20 spherical -21.13 0.10 S21 spherical 15.28 0.55 1.73 28.31 S22 spherical 8.42 3.95 1.44 94.58 S23 spherical -30.54 D3 S24 spherical -72.52 1.55 1.95 17.98 S25 spherical -16.24 0.55 1.67 32.17 S26 spherical 8.29 D4 S27 spherical 27.45 1.37 1.49 70.45 S28 spherical 189.46 0.10 S29 spherical 10.53 2.23 1.59 61.25 S30 spherical -165.31 1.90 S31 spherical INF 1.10 1.52 64.2 S32 spherical INF 1.00 IMG

[0142] Table 5

[0143] WIDE TELE D1 0.5 30.95 D2 31.47 1.02 D3 0.9 5.5 D4 14.6 10

[0144] Table 6

[0145]

[0146] In this embodiment, fw = 5.3 mm, ft = 130 mm, ft / fw = 24.53, and TTL = 93.04 mm.

[0147] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, and TTL is the total optical length of the zoom lens.

[0148] fG5=13.58mm, fG5 / fw=2.56;

[0149] Wherein, fG5 is the focal length of the third fixed lens group G5.

[0150] XG2=30.45mm, XG4=4.6mm, XG2 / TTL=0.327, XG4 / XG2=0.15;

[0151] Wherein, XG2 is the moving distance of the zoom lens group G2, and XG4 is the moving distance of the focusing lens group G4.

[0152] R111=10.53mm, R112=-165.31mm, R112 / (R111+R112)=1.07;

[0153] Wherein, R111 is the radius of curvature of the eleventh fixed lens a11 near the object plane, and R112 is the radius of curvature of the eleventh fixed lens a11 near the image plane.

[0154] f1=fa89=36.86mm; f2=fa67=164.23mm;

[0155] f1 / fw=6.95; f2 / fw=30.99;

[0156] Wherein, f1 and f2 are the focal lengths of the two cemented lenses in the second fixed lens group G3, respectively; fa67 is the combined focal length of the cemented doublet formed by the sixth fixed lens a6 and the seventh fixed lens a7, and fa89 is the combined focal length of the cemented doublet formed by the eighth fixed lens a8 and the ninth fixed lens a9.

[0157] Example 4

[0158] An imaging device, such as Figures 1 to 10 As shown, it includes: a zoom lens as described in any of the above embodiments, and an imaging element configured to receive an image formed by the zoom lens.

[0159] 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 a third fixed lens group with positive optical power. The zoom lens group and the focusing lens group move along the main optical axis 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, a third fixed lens with positive optical power, and a fourth fixed lens with positive optical power, from the object plane side to the image plane side. The first fixed lens and the second fixed lens are cemented together. 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 fixed lens group consists of a fifth fixed lens with positive optical power, a sixth fixed lens with negative optical power, a seventh fixed lens with positive optical power, an eighth fixed lens with negative optical power, and a ninth fixed lens with positive optical power, from the object plane side to the image plane side. The sixth and seventh fixed lenses form a cemented doublet lens, and the eighth and ninth fixed lenses form a cemented doublet lens. The focusing lens group consists of a first focusing lens with positive optical power and a second focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side, and the first focusing lens and the second focusing lens are cemented together. The second fixed lens group includes two sets of cemented lenses; The third fixed lens group includes at least one lens with positive optical power; The third fixed lens group consists of a tenth fixed lens with negative optical power and an eleventh fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side; or, the third fixed lens group consists of a tenth fixed lens with positive optical power and an eleventh fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side. The zoom lens satisfies the following condition: ft / fw > 20; TTL < 100mm; 2 < fG5 / fw < 3; 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, TTL is the total optical length of the zoom lens, and fG5 is the focal length of the third fixed lens group.

2. A zoom lens according to claim 1, characterized in that: Both the zoom lens group and the second fixed lens group are equipped with an aspherical lens.

3. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 0.3 < XG2 / TTL < 0.35; Wherein, XG2 is the moving distance of the zoom lens group.

4. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 0.1 < XG4 / XG2 < 0.2; Wherein, XG4 is the moving distance of the focusing lens group.

5. A zoom lens according to claim 1, characterized in that: The eleventh fixed lens satisfies the following condition: 0.9<R112 / (R111+R112)<1.2; Wherein, R111 is the radius of curvature of the eleventh fixed lens near the object plane, and R112 is the radius of curvature of the eleventh fixed lens near the image plane.

6. A zoom lens according to claim 1, characterized in that: The two sets of cemented lenses in the second fixed lens group each satisfy one of the following conditions: 4 < f1 / fw < 8; 30 < f2 / fw < 35; Where f1 and f2 are the focal lengths of the two cemented lenses in the second fixed lens group, respectively.

7. An imaging device, characterized in that, include: The zoom lens as described in any one of claims 1 to 6; And an imaging element, configured to receive an image formed by the zoom lens.

Images