Zoom lens and imaging device

Abstract

The present invention relates to the field of optics, and specifically to a zoom lens and an imaging device. The zoom lens is composed of a first fixed lens group with positive focal length, a first variable magnification lens group with negative focal length, an aperture, a second fixed lens group with positive focal length, a focusing lens group with negative focal length, and a second variable magnification lens group with positive focal length, from the object side to the image side; the zoom lens satisfies the following conditions: TTL < 90mm; ft / fw > 30; wherein TTL is the total optical length of the zoom lens, ft is the focal length of the zoom lens in the telephoto state, and fw is the focal length of the zoom lens in the wide-angle state. By using multiple aspherical lenses, the miniaturization of the zoom lens is achieved, and by means of multi-group linkage, the zoom capability of the zoom lens is further increased, the scope of application of the zoom lens is increased, and the user experience is enhanced.

Description

Technical Field

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

[0002] A zoom lens is a camera lens that can change its focal length within a certain range, thereby achieving varying angles of view, image sizes, and subject coverage. By varying the focal length without changing the shooting distance, a zoom lens can alter the shooting range, making it highly advantageous for composition. Because a single zoom lens can function as several fixed-focus lenses, it not only reduces the amount of photographic equipment carried when traveling, but also saves time when changing lenses.

[0003] Currently, for medium and long-range zoom lenses, in order to increase the zoom capability of the zoom lens, more lenses are usually set to achieve a stronger zoom capability of the zoom lens. However, this causes the problem of large lens size, which makes it difficult to use in some areas with a relatively narrow shooting range, reducing the user experience. Summary of the Invention

[0004] The present invention will solve the existing technical problems and provide a zoom lens and an imaging device. By using multiple aspherical lenses, the zoom lens can be miniaturized. At the same time, through the multi-group linkage method, the zoom capability of the zoom lens is further increased, the application range of the zoom lens is increased, and the user experience is enhanced.

[0005] The technical solutions provided by the present invention are as follows:

[0006] A zoom lens, comprising, from the object side to the image side, a first fixed lens group with positive focal power, a first variable-power lens group with negative focal power, an aperture stop, a second fixed lens group with positive focal power, a focusing lens group with negative focal power, and a second variable-power lens group with positive focal power;

[0007] The first fixed lens group is composed of, from the object plane side to the image plane side, 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; the first fixed lens and the second fixed lens are cemented together;

[0008] The first variator lens group consists of, from the object side to the image side, a first variator lens with negative optical power, a second variator lens with negative optical power, and a third variator lens with positive optical power;

[0009] The focusing lens group is a focusing lens with negative optical power;

[0010] There is at least one aspherical lens in each of the second fixed lens group and the second variable magnification lens group;

[0011] The zoom lens satisfies the following conditional formula:

[0012] TTL<90mm

[0013] ft / fw>30;

[0014] Wherein, TTL is the total optical length of the zoom lens, ft is the focal length of the zoom lens in the telephoto state, and fw is the focal length of the zoom lens in the wide-angle state.

[0015] In this technical solution, the miniaturization of the zoom lens is achieved by using multiple aspheric lenses. At the same time, through the multi-group linkage method, the zoom capability of the zoom lens is further increased, the application range of the zoom lens is expanded, and the user experience is enhanced.

[0016] Preferably, the second fixed lens group consists of, from the object plane side to the image plane side, a fifth fixed lens with positive optical focal length, a sixth fixed lens with negative optical focal length, a seventh fixed lens with positive optical focal length, an eighth fixed lens with negative optical focal length, and a ninth fixed lens with positive optical focal length; and the eighth fixed lens and the ninth fixed lens are cemented together.

[0017] Preferably, the sixth fixed lens and the seventh fixed lens are glued together.

[0018] Preferably, the second variable magnification lens group is a fourth variable magnification lens with positive optical power.

[0019] Preferably, the zoom lens satisfies the following conditional formula:

[0020] 0.3<XG2 / TTL<0.35;

[0021] Wherein, XG2 is the maximum moving distance of the first zoom lens group.

[0022] In this technical solution, by providing a variable magnification lens group with a relatively large moving range, a larger zoom capability can be achieved, and the size of the zoom lens can be prevented from being too large.

[0023] Preferably, the zoom lens satisfies the following conditional formula:

[0024] 0.05<XG4 / XG2<0.15;

[0025] 0.05<XG5 / XG2<0.2;

[0026] Among them, XG4 is the maximum moving distance of the focusing lens group, and XG5 is the maximum moving distance of the second zoom lens group.

[0027] In this technical solution, by setting the above parameters, auxiliary zooming and focusing of the zoom lens are achieved, and the miniaturization of the zoom lens can be achieved at the same time.

[0028] 7 Preferably, the second fixed lens group satisfies the following conditional formula:

[0029] 0.9<Ra62 / Ra71<1.1;

[0030] Wherein, Ra62 is the curvature radius of the image-side curved surface of the sixth fixed lens, and Ra71 is the curvature radius of the object-side curved surface of the seventh fixed lens.

[0031] In this technical solution, by limiting the curvature radius of the sixth fixed lens and the seventh fixed lens, the possibility of optical path dissipation from the sixth fixed lens to the seventh fixed lens is reduced, the transmittance of the zoom lens is increased, and the chromatic aberration and coma of the zoom lens are reduced.

[0032] Preferably, the first variable magnification lens group satisfies the following conditional formula:

[0033] 0.3<Rb22 / Rb31<3;

[0034] Wherein, Rb22 is the curvature radius of the curved surface on the image side of the second variator lens, and Rb31 is the curvature radius of the curved surface on the object side of the third variator lens.

[0035] In this technical solution, by setting the curvature radius of the second and third zoom lenses, the chromatic aberration and coma generated by the zoom lens during the zooming process are greatly reduced, while the resolution of the zoom lens in the wide-angle state is increased.

[0036] Another object of the present 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.

[0037] Compared with the prior art, the zoom lens and imaging device provided by the present invention have the following beneficial effects:

[0038] 1. The use of multiple aspherical lenses has achieved the miniaturization of the zoom lens. At the same time, through the multi-group linkage method, the zoom capability of the zoom lens is further increased, the scope of application of the zoom lens is expanded, and the user experience is enhanced.

[0039] 2. By limiting the curvature radius of the sixth and seventh fixed lenses, the possibility of optical path dissipation from the sixth to the seventh fixed lenses is reduced, the transmittance of the zoom lens is increased, and the chromatic aberration and coma of the zoom lens are reduced.

[0040] 3. By setting the curvature radius of the second and third zoom lenses, the chromatic aberration and coma produced by the zoom lens during zooming are greatly reduced, while the resolution of the zoom lens in the wide-angle state is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of a zoom lens and an imaging device.

[0042] Figure 1 It is a structural schematic diagram of a zoom lens of the present invention;

[0043] Figure 2 This is an aberration diagram of a zoom lens in a telephoto state according to the present invention;

[0044] Figure 3 This is an aberration diagram of a zoom lens in a wide-angle state according to the present invention;

[0045] Figure 4 This is a first coma diagram of a zoom lens in a telephoto state according to the present invention;

[0046] Figure 5 This is a second coma diagram of a zoom lens in a telephoto state according to the present invention;

[0047] Figure 6 is a first coma diagram of a zoom lens in a wide-angle state according to the present invention;

[0048] Figure 7 is a second coma diagram of a zoom lens in a wide-angle state according to the present invention;

[0049] Figure 8 is a schematic structural diagram of another zoom lens of the present invention;

[0050] Figure 9 is an aberration diagram of another zoom lens in the telephoto state of the present invention;

[0051] Figure 10 is an aberration diagram of another zoom lens in wide-angle state according to the present invention;

[0052] Figure 11 is a first coma diagram of another zoom lens in the telephoto state according to the present invention;

[0053] Figure 12 is a second coma diagram of another zoom lens in the telephoto state according to the present invention;

[0054] Figure 13 is a first coma diagram of another zoom lens in wide-angle state according to the present invention;

[0055] Figure 14is a second coma diagram of another zoom lens in wide-angle state according to the present invention;

[0056] Figure 15 1 is a structural schematic diagram of another zoom lens of the present invention;

[0057] Figure 16 This is an aberration diagram of another zoom lens in the telephoto state of the present invention;

[0058] Figure 17 This is an aberration diagram of another zoom lens in the wide-angle state of the present invention;

[0059] Figure 18 This is a first coma diagram of another zoom lens in the telephoto state of the present invention;

[0060] Figure 19 is a second coma diagram of another zoom lens in the telephoto state according to the present invention;

[0061] Figure 20 is a first coma diagram of another zoom lens in wide-angle state according to the present invention;

[0062] Figure 21 This is a second coma diagram of another zoom lens in the wide-angle state according to the present invention.

[0063] Explanation of the accompanying drawings: G1, first fixed lens group; G2, first zoom lens group; G3, second fixed lens group; G4, focusing lens group; G5, second zoom 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; STO, aperture; CG, protective glass. DETAILED DESCRIPTION

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0065] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0066] Example 1

[0067] like Figure 1 As shown, a zoom lens is composed of, from the object side to the image side, a first fixed lens group G1 with positive focal power, a first variable magnification lens group G2 with negative focal power, an aperture stop STO, a second fixed lens group G3 with positive focal power, a focusing lens group G4 with negative focal power, and a second variable magnification lens group G5 with positive focal power;

[0068] The first fixed lens group G1 consists of, from the object side to the image side, 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; the first fixed lens a1 and the second fixed lens a2 are cemented together;

[0069] The first variator lens group G2 is composed of a first variator lens b1 with negative optical power, a second variator lens b2 with negative optical power, and a third variator lens b3 with positive optical power, from the object side to the image side.

[0070] The focusing lens group G4 is a focusing lens with negative optical power;

[0071] There is at least one aspherical lens in each of the second fixed lens group G3 and the second variable magnification lens group G5;

[0072] The zoom lens satisfies the following conditional formula:

[0073] TTL<90mm

[0074] ft / fw>30;

[0075] Wherein, TTL is the total optical length of the zoom lens, ft is the focal length of the zoom lens in the telephoto state, and fw is the focal length of the zoom lens in the wide-angle state.

[0076] In this embodiment, the zoom lens is miniaturized by using multiple aspheric lenses. At the same time, the zoom capability of the zoom lens is further increased by multi-group linkage, which increases the scope of application of the zoom lens and enhances the user experience.

[0077] The second fixed lens group G3 consists of, from the object plane side to the image plane side, 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; the eighth fixed lens a8 and the ninth fixed lens a9 are cemented together.

[0078] The sixth fixed lens a6 and the seventh fixed lens a7 are cemented together.

[0079] The second variator lens group G5 is a fourth variator lens b4 with positive refractive power.

[0080] The zoom lens satisfies the following conditional formula:

[0081] 0.3<XG2 / TTL<0.35;

[0082] Wherein, XG2 is the maximum moving distance of the first zoom lens group G2.

[0083] In this embodiment, by providing a variable magnification lens group with a relatively large moving range, a larger zoom capability can be achieved while also preventing the zoom lens from being too large.

[0084] The zoom lens satisfies the following conditional formula:

[0085] 0.05<XG4 / XG2<0.15;

[0086] 0.05<XG5 / XG2<0.2;

[0087] Among them, XG4 is the maximum moving distance of the focusing lens group G4, and XG5 is the maximum moving distance of the second zoom lens group G5.

[0088] By setting the above parameters, auxiliary zooming and focusing of the zoom lens are achieved, and the miniaturization of the zoom lens can be achieved at the same time.

[0089] The second fixed lens group G3 satisfies the following conditional formula:

[0090] 0.9<Ra62 / Ra71<1.1;

[0091] Wherein, Ra62 is the curvature radius of the image-side curved surface of the sixth fixed lens a6, and Ra71 is the curvature radius of the object-side curved surface of the seventh fixed lens a7.

[0092] By limiting the curvature radii of the sixth fixed lens a6 and the seventh fixed lens a7, the possibility of optical path dissipation from the sixth fixed lens a6 to the seventh fixed lens a7 is reduced, the transmittance of the zoom lens is increased, and the chromatic aberration and coma of the zoom lens are reduced.

[0093] The first variable magnification lens group G2 satisfies the following conditional formula:

[0094] 0.3<Rb22 / Rb31<3;

[0095] Rb22 is the curvature radius of the image-side curved surface of the second variator lens b2 , and Rb31 is the curvature radius of the object-side curved surface of the third variator lens b3 .

[0096] By setting the curvature radius of the second variator lens b2 and the third variator lens b3, the chromatic aberration and coma aberration generated by the zoom lens during zooming are greatly reduced, while the resolution of the zoom lens in the wide-angle state is increased.

[0097] Example 2

[0098] like Figures 1 to 7 As shown, a zoom lens is composed of a first fixed lens group G1 with positive focal length, a first variable magnification lens group G2 with negative focal length, an aperture STO, a second fixed lens group G3 with positive focal length, a focusing lens group G4 with negative focal length, a second variable magnification lens group G5 with positive focal length, and an auxiliary component G6 from the object side to the image side.

[0099] The first fixed lens group G1 consists of a first fixed lens a1 with negative optical focal length, a second fixed lens a2 with positive optical focal length, a third fixed lens a3 with positive optical focal length, and a fourth fixed lens a4 with positive optical focal length, 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 first variator lens group G2 consists of a first variator lens b1 with negative optical power, a second variator lens b2 with negative optical power, and a third variator lens b3 with positive optical power, in order from the object side to the image side.

[0101] The second fixed lens group G3 is composed of, from the object plane side to the image plane side, a fifth fixed lens a5 with positive optical focal length, a sixth fixed lens a6 with negative optical focal length, a seventh fixed lens a7 with positive optical focal length, an eighth fixed lens a8 with negative optical focal length, and a ninth fixed lens a9 with positive optical focal length; the eighth fixed lens a8 and the ninth fixed lens a9 are cemented together, and the sixth fixed lens a6 and the seventh fixed lens a7 are cemented together.

[0102] The focusing lens group G4 is a focusing lens with negative optical power.

[0103] The second variator lens group G5 is a fourth variator lens b4 with positive refractive power.

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

[0105] Table 1 shows basic lens data of the zoom lens of this embodiment, Table 2 shows variable parameters in Table 1, and Table 3 shows aspherical coefficients.

[0106] The surface number column shows the surface number when the object side surface is set as the first surface and the numbers increase one by one toward the image side; the surface type column shows the surface type of a certain lens; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, it indicates that the surface is curved toward the object side, and when the curvature radius is negative, it indicates that the surface is curved toward the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to its image side; the refractive index column shows the refractive index of a certain lens; and the Abbe number column shows the Abbe number of a certain lens.

[0107] In Table 2, the WIDE column indicates specific values ​​of various variable parameters when the zoom lens is at the wide-angle end state, and the TELE column indicates specific values ​​of various variable parameters when the zoom lens is at the telephoto end state.

[0108] In Table 3, K is the cone 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 0.52 27.64 D2 27.27 0.15 D3 0.63 3.74 D4 9.77 9.93 D5 3.37 0.1

[0114]

Table 3

[0115]

[0116] In this embodiment, TTL=85.52 mm, ft=135.7 mm, fw=4.29 mm, fno=1.65-4.76;

[0117] Wherein, TTL is the total optical length of the zoom lens, 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 fno is the aperture number of the zoom lens.

[0118] XG2=28.01mm, XG2 / TTL=0.328;

[0119] Wherein, XG2 is the maximum moving distance of the first zoom lens group G2.

[0120] XG4=3.31mm, XG5=3.27mm;

[0121] XG4 / XG2=0.118, XG5 / XG2=0.117;

[0122] Among them, XG4 is the maximum moving distance of the focusing lens group G4, and XG5 is the maximum moving distance of the second zoom lens group G5.

[0123] Ra62=Ra71=11.281mm;

[0124] Ra62 / Ra71=1;

[0125] Wherein, Ra62 is the curvature radius of the image-side curved surface of the sixth fixed lens a6, and Ra71 is the curvature radius of the object-side curved surface of the seventh fixed lens a7.

[0126] Rb22=19.461mm, Rb31=17.981mm;

[0127] Rb22 / Rb31=1.08;

[0128] Rb22 is the curvature radius of the image-side curved surface of the second variator lens b2 , and Rb31 is the curvature radius of the object-side curved surface of the third variator lens b3 .

[0129] Example 3

[0130] like Figures 8 to 14 As shown, a zoom lens is composed of a first fixed lens group G1 with positive focal length, a first variable magnification lens group G2 with negative focal length, an aperture STO, a second fixed lens group G3 with positive focal length, a focusing lens group G4 with negative focal length, a second variable magnification lens group G5 with positive focal length, and an auxiliary component G6 from the object side to the image side.

[0131] The first fixed lens group G1 consists of a first fixed lens a1 with negative optical focal length, a second fixed lens a2 with positive optical focal length, a third fixed lens a3 with positive optical focal length, and a fourth fixed lens a4 with positive optical focal length, from the object plane side to the image plane side; the first fixed lens a1 and the second fixed lens a2 are cemented together.

[0132] The first variator lens group G2 is composed of a first variator lens b1 with negative optical power, a second variator lens b2 with negative optical power, and a third variator lens b3 with positive optical power, from the object side to the image side.

[0133] The second fixed lens group G3 consists of, from the object plane side to the image plane side, 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; the eighth fixed lens a8 and the ninth fixed lens a9 are cemented together.

[0134] The focusing lens group G4 is a focusing lens with negative optical power;

[0135] The second variator lens group G5 is a fourth variator lens b4 with positive refractive power.

[0136] The auxiliary component G6 is a protective glass CG.

[0137] Basic lens data of the zoom lens of this embodiment are shown in Table 4, variable parameters in Table 4 are shown in Table 5, and aspheric coefficients are shown in Table 6.

[0138] The surface number column shows the surface number when the object side surface is set as the first surface and the numbers increase one by one toward the image side; the surface type column shows the surface type of a certain lens; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, it indicates that the surface is curved toward the object side, and when the curvature radius is negative, it indicates that the surface is curved toward the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to its image side; the refractive index column shows the refractive index of a certain lens; and the Abbe number column shows the Abbe number of a certain lens.

[0139] In Table 5, the WIDE column indicates specific values ​​of various variable parameters when the zoom lens is at the wide-angle end state, and the TELE column indicates specific values ​​of various variable parameters when the zoom lens is at the telephoto end state.

[0140] In Table 6, K is the cone coefficient, and e is the scientific notation, for example, e-05 represents 10 -5 .

[0141]

Table 4

[0142]

[0143]

[0144]

Table 5

[0145] WIDE TELE D1 0.45 27.47 D2 27.92 0.9 D3 0.99 3.26 D4 9.69 9.65 D5 2.61 0.38

[0146]

Table 6

[0147]

[0148]

[0149] In this embodiment, TTL=85.5mm, ft=135.7mm, fw=4.29mm, fno=1.63-4.71;

[0150] Wherein, TTL is the total optical length of the zoom lens, 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 fno is the aperture number of the zoom lens.

[0151] XG2=28.05mm, XG2 / TTL=0.328;

[0152] Wherein, XG2 is the maximum moving distance of the first zoom lens group G2.

[0153] XG4=2.23mm, XG5=2.27mm;

[0154] XG4 / XG2=0.08, XG5 / XG2=0.081;

[0155] Among them, XG4 is the maximum moving distance of the focusing lens group G4, and XG5 is the maximum moving distance of the second zoom lens group G5.

[0156] Ra62=10.777mm, Ra71=11.153mm;

[0157] Ra62 / Ra71=0.966;

[0158] Wherein, Ra62 is the curvature radius of the image-side curved surface of the sixth fixed lens a6, and Ra71 is the curvature radius of the object-side curved surface of the seventh fixed lens a7.

[0159] Rb22=29.316mm, Rb31=12.045mm;

[0160] Rb22 / Rb31=2.43;

[0161] Rb22 is the curvature radius of the image-side curved surface of the second variator lens b2 , and Rb31 is the curvature radius of the object-side curved surface of the third variator lens b3 .

[0162] Example 4

[0163] like Figures 15 to 21 As shown, a zoom lens is composed of a first fixed lens group G1 with positive focal length, a first variable magnification lens group G2 with negative focal length, an aperture STO, a second fixed lens group G3 with positive focal length, a focusing lens group G4 with negative focal length, a second variable magnification lens group G5 with positive focal length, and an auxiliary component G6 from the object side to the image side.

[0164] The first fixed lens group G1 consists of a first fixed lens a1 with negative optical focal length, a second fixed lens a2 with positive optical focal length, a third fixed lens a3 with positive optical focal length, and a fourth fixed lens a4 with positive optical focal length, from the object plane side to the image plane side; the first fixed lens a1 and the second fixed lens a2 are cemented together.

[0165] The first variator lens group G2 is composed of a first variator lens b1 with negative optical power, a second variator lens b2 with negative optical power, and a third variator lens b3 with positive optical power, from the object side to the image side.

[0166] The second fixed lens group G3 consists of, from the object plane side to the image plane side, a fifth fixed lens a5 with positive optical focal length, a sixth fixed lens a6 with negative optical focal length, a seventh fixed lens a7 with positive optical focal length, an eighth fixed lens a8 with negative optical focal length, and a ninth fixed lens a9 with positive optical focal length; the sixth fixed lens a6 and the seventh fixed lens a7 are cemented together, and the eighth fixed lens a8 and the ninth fixed lens a9 are cemented together.

[0167] The focusing lens group G4 is a focusing lens with negative optical power;

[0168] The second variator lens group G5 is a fourth variator lens b4 with positive refractive power.

[0169] The auxiliary component G6 is a protective glass CG.

[0170] Basic lens data of the zoom lens of this embodiment are shown in Table 7, variable parameters in Table 7 are shown in Table 8, and aspheric coefficients are shown in Table 9.

[0171] The surface number column shows the surface number when the object side surface is set as the first surface and the numbers increase one by one toward the image side; the surface type column shows the surface type of a certain lens; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, it indicates that the surface is curved toward the object side, and when the curvature radius is negative, it indicates that the surface is curved toward the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to its image side; the refractive index column shows the refractive index of a certain lens; and the Abbe number column shows the Abbe number of a certain lens.

[0172] In Table 8, the WIDE column indicates specific values ​​of various variable parameters when the zoom lens is at the wide-angle end state, and the TELE column indicates specific values ​​of various variable parameters when the zoom lens is at the telephoto end state.

[0173] In Table 9, K is the cone coefficient, and e is the scientific notation, for example, e-05 represents 10 -5 .

[0174]

Table 7

[0175]

[0176]

[0177]

Table 8

[0178]

[0179]

[0180]

Table 9

[0181]

[0182] In this embodiment, TTL=77.01 mm, ft=135.7 mm, fw=4.3 mm, fno=2.05-5.3;

[0183] Wherein, TTL is the total optical length of the zoom lens, 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 fno is the aperture number of the zoom lens.

[0184] XG2=28.24mm, XG2 / TTL=0.367;

[0185] Wherein, XG2 is the maximum moving distance of the first zoom lens group G2.

[0186] XG4=3.43mm, XG5=4.94mm;

[0187] XG4 / XG2=0.121, XG5 / XG2=0.175;

[0188] Among them, XG4 is the maximum moving distance of the focusing lens group G4, and XG5 is the maximum moving distance of the second zoom lens group G5.

[0189] Ra62=Ra71=10.37mm;

[0190] Ra62 / Ra71=1;

[0191] Wherein, Ra62 is the curvature radius of the image-side curved surface of the sixth fixed lens a6, and Ra71 is the curvature radius of the object-side curved surface of the seventh fixed lens a7.

[0192] Rb22=24.03mm, Rb31=10.59mm;

[0193] Rb22 / Rb31=2.27;

[0194] Rb22 is the curvature radius of the image-side curved surface of the second variator lens b2 , and Rb31 is the curvature radius of the object-side curved surface of the third variator lens b3 .

[0195] Example 5

[0196] An imaging device, such as Figures 1 to 21 As shown, it includes: a zoom lens as described in any one of the above embodiments, and an imaging element, which is configured to receive an image formed by the zoom lens.

[0197] 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 those skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and such 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 is composed of, from the object side to the image side, a first fixed lens group with positive focal power, a first variable magnification lens group with negative focal power, an aperture, a second fixed lens group with positive focal power, a focusing lens group with negative focal power, and a second variable magnification lens group with positive focal power. The first fixed lens group is composed of, from the object plane side to the image plane side, 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; the first fixed lens and the second fixed lens are cemented together; The first variator lens group consists of, from the object side to the image side, a first variator lens with negative optical power, a second variator lens with negative optical power, and a third variator lens with positive optical power; The second fixed lens group is composed of, from the object plane side to the image plane side, 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; the eighth fixed lens and the ninth fixed lens are cemented together; The focusing lens group is a focusing lens with negative optical power; There is at least one aspherical lens in each of the second fixed lens group and the second variable magnification lens group; The zoom lens satisfies the following conditional formula: TTL<90mm; ft / fw>30; 0.9<Ra62 / Ra71<1.1; Wherein, TTL is the total optical length of the zoom lens, 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, Ra62 is the curvature radius of the image-side curved surface of the sixth fixed lens, and Ra71 is the curvature radius of the object-side curved surface of the seventh fixed lens.

2. The zoom lens according to claim 1, wherein: The sixth fixed lens and the seventh fixed lens are cemented together.

3. The zoom lens according to claim 1, wherein: The second variable magnification lens group is a fourth variable magnification lens with positive optical power.

4. The zoom lens according to claim 1, wherein: The zoom lens satisfies the following conditional formula: 0.3<XG2 / TTL<0.35; Wherein, XG2 is the maximum moving distance of the first zoom lens group.

5. The zoom lens according to claim 4, wherein: The zoom lens satisfies the following conditional formula: 0.05<XG4 / XG2<0.15; 0.05<XG5 / XG2<0.2; Among them, XG4 is the maximum moving distance of the focusing lens group, and XG5 is the maximum moving distance of the second zoom lens group.

6. The zoom lens according to claim 1, wherein: The first zoom lens group satisfies the following conditional formula: 0.3<Rb22 / Rb31<3; Wherein, Rb22 is the curvature radius of the curved surface on the image side of the second variator lens, and Rb31 is the curvature radius of the curved surface on the object side of the third variator lens.

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

Images