Zoom lens and imaging device

Abstract

The present invention relates to the field of optics, and specifically to a zoom lens and imaging device. The zoom lens comprises, from the object side to the image side, a first fixed lens group with positive focal length, a first variable magnification lens group with negative focal length, a second variable magnification lens group with positive focal length, an aperture, a focusing lens group, a compensation lens group with negative focal length, and an auxiliary variable magnification group with positive focal length. The focusing lens group is formed by a single lens. The zoom lens satisfies the following conditions: ft / fw ≥ 60; fnow < 3.2; wherein fw is the focal length of the zoom lens in wide-angle mode, ft is the focal length of the zoom lens in telephoto mode, and fnow is the aperture number of the zoom lens in wide-angle mode. By providing multiple movable groups, a zoom lens with a large focal length can achieve a large magnification while also achieving a smaller aperture number, thereby increasing the brightness of the zoom lens.

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, existing large-focal-length zoom lenses have low resolution due to their large focal length. Therefore, in order to increase the resolution, the only way is to increase the size of the zoom lens to a certain extent, or reduce the moving distance of the moving group within the zoom lens to reduce the aberration and coma of the zoom lens. However, when a large-focal-length zoom lens needs to achieve a high magnification, the moving distance of the moving group within the zoom lens is relatively small, making it difficult to meet the high magnification requirements of the zoom lens. Summary of the Invention

[0004] The present invention solves existing technical problems and provides a zoom lens and an imaging device. By setting up multiple moving groups, a zoom lens with a large focal length can achieve a large magnification while also achieving a smaller aperture number, thereby increasing the brightness of the zoom lens.

[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 optical power, a first variable magnification lens group with negative optical power, a second variable magnification lens group with positive optical power, an aperture, a focusing lens group, a compensation lens group with negative optical power, and an auxiliary variable magnification lens group with positive optical power;

[0007] The first zoom lens group, the second zoom lens group, the focusing lens group, the compensating lens group, and the auxiliary zoom lens group move along the main optical axis of the zoom lens;

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

[0009] The focusing lens group is formed by one lens;

[0010] The zoom lens satisfies the following conditional formula:

[0011] ft / fw≥60;

[0012] fnow<3.2;

[0013] Wherein, fw is the focal length of the zoom lens in the wide-angle state, ft is the focal length of the zoom lens in the telephoto state, and fnow is the aperture number of the zoom lens in the wide-angle state.

[0014] In this technical solution, by setting a plurality of moving groups, a zoom lens with a large focal length can achieve a large magnification while also achieving a smaller aperture number, thereby increasing the brightness of the zoom lens.

[0015] Preferably, the first zoom lens group consists of, from the object side to the image side, a first zoom lens with negative optical power, a second zoom lens with negative optical power, a third zoom lens with positive optical power, a fourth zoom lens with negative optical power, and a fifth zoom lens with positive optical power. The third zoom lens, the fourth zoom lens and the fifth zoom lens together constitute a triplet lens.

[0016] Preferably, the second magnification lens group consists of a sixth magnification lens with positive focal power, a seventh magnification lens with positive focal power, an eighth magnification lens with negative focal power, and a ninth magnification lens with positive focal power from the object side to the image side, and the eighth magnification lens and the ninth magnification lens are cemented together.

[0017] The compensation lens group is composed of a first compensation lens with positive optical power and a second compensation lens with negative optical power in sequence from the object plane side to the image plane side, and the first compensation lens and the second compensation lens are cemented together.

[0018] The auxiliary zoom group is composed of a first auxiliary lens with positive optical power, a second auxiliary lens with negative optical power, and a third auxiliary lens with positive optical power from the object side to the image side, and the first auxiliary lens and the second auxiliary lens are glued together.

[0019] Preferably, the first variable magnification lens group satisfies the following conditional formula:

[0020] fb35 / fG2>15;

[0021] Wherein, fb35 is the combined focal length of the third to fifth variator lenses, and fG2 is the focal length of the first variator lens group.

[0022] In this technical solution, by limiting the combined focal length of the third to fifth zoom lenses, the chromatic aberration and astigmatism of the zoom lens are greatly improved, thereby improving the imaging quality.

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

[0024] 2<fG3 / fw<4;

[0025] Wherein, fG3 is the focal length of the second zoom lens group.

[0026] In this technical solution, by limiting the focal length of the second variable magnification lens group, it is possible to achieve miniaturization of the zoom lens and reduce the possibility of the focal length of the remaining lens groups being too large.

[0027] Preferably, the zoom lens satisfies the following conditional formula:

[0028] -40<ft / fG5<-20;

[0029] 20<ft / fG6<40;

[0030] Among them, fG5 is the focal length of the compensation lens group, and fG6 is the focal length of the auxiliary zoom group.

[0031] In this technical solution, by setting the focal lengths of the compensation lens group and the auxiliary zoom group, the aberration and coma of the zoom lens are reduced, and the resolution of the zoom lens is increased.

[0032] Preferably, the zoom lens satisfies the following conditional formula:

[0033] 1<LG6 / fw<2;

[0034] Among them, LG6 is the total optical length of the auxiliary zoom group.

[0035] In this technical solution, by limiting the total optical length of the auxiliary zoom group, the correction of light by the auxiliary zoom group is further achieved, the possibility of aberration and coma generated by the zoom lens is reduced, and the resolution of the zoom lens is increased.

[0036] Preferably, the zoom lens satisfies the following conditional formula:

[0037] │Re32 / Re31│>2.5;

[0038] Re31 is the curvature radius of the curved surface of the third auxiliary lens facing the object plane, and Re32 is the curvature radius of the curved surface of the third auxiliary lens facing the image plane.

[0039] In this technical solution, by limiting the curvature radius of the third auxiliary lens, the angle at which light enters the image plane is reduced, thereby reducing the dissipation of light when entering the image plane and increasing the brightness of the zoom lens.

[0040] Preferably, the zoom lens satisfies the following conditional formula:

[0041] 2<DG2 / fw<5;

[0042] 2<DG3 / fw<4;

[0043] Wherein, DG2 is the moving distance of the first zoom lens group, and DG3 is the moving distance of the second zoom lens group.

[0044] In this technical solution, by limiting the appropriate distance between the first zoom lens group and the second zoom lens group, a larger zoom capability of the zoom lens is achieved, and the possibility of the zoom lens being too large can be avoided to a certain extent, thereby achieving miniaturization of the zoom lens.

[0045] 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.

[0046] Compared with the prior art, the zoom lens and imaging device provided by the present invention have the following beneficial effects:

[0047] 1. By setting up multiple moving groups, a large focal length zoom lens can achieve a large magnification while also achieving a smaller aperture number, thereby increasing the brightness of the zoom lens.

[0048] 2. By limiting the focal length of the second zoom lens group, the zoom lens can be miniaturized while reducing the possibility of the focal length of the remaining lens groups being too large.

[0049] 3. By limiting the curvature radius of the third auxiliary lens, the angle at which light enters the image plane is reduced, thereby reducing the dissipation of light when entering the image plane and increasing the brightness of the zoom lens.

[0050] 4. By limiting the appropriate distance between the first zoom lens group and the second zoom lens group, a larger zoom capability of the zoom lens is achieved, and the possibility of the zoom lens being too large can be avoided to a certain extent, thereby achieving miniaturization of the zoom lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] 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.

[0052] Figure 1 It is a structural schematic diagram of a zoom lens of the present invention;

[0053] Figure 2 This is an aberration diagram of a zoom lens in a wide-angle state according to the present invention;

[0054] Figure 3 This is an aberration diagram of a zoom lens in a telephoto state according to the present invention;

[0055] Figure 4 is a schematic structural diagram of another zoom lens of the present invention;

[0056] Figure 5 is an aberration diagram of another zoom lens in wide-angle state according to the present invention;

[0057] Figure 6 is an aberration diagram of another zoom lens in the telephoto state of the present invention;

[0058] Figure 7 1 is a structural schematic diagram of another zoom lens of the present invention;

[0059] Figure 8 This is an aberration diagram of another zoom lens in the wide-angle state of the present invention;

[0060] Figure 9 This is an aberration diagram of another zoom lens in the telephoto state according to the present invention.

[0061] Explanation of the accompanying symbols: G1, first fixed lens group; G2, first zoom lens group; G3, second zoom lens group; G4, focusing lens group; G5, compensating lens group; G6, auxiliary zoom group; G7, 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; b1, first zoom lens; b2, second zoom lens; b3, third zoom lens; b4, fourth zoom lens; b5, fifth zoom lens; b6, sixth zoom lens; b7, seventh zoom lens; b8, eighth zoom lens; b9, ninth zoom lens; c1, first focusing lens; d1, first compensating lens; d2, second compensating lens; e1, first auxiliary lens; e2, second auxiliary lens; e3, third auxiliary lens; STO, aperture; CG1, first protective glass; CG2, second protective glass. DETAILED DESCRIPTION

[0062] 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.

[0063] 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."

[0064] Example 1

[0065] like Figure 1 、 Figure 4 and Figure 7 As shown, a zoom lens comprises, from the object side to the image side, a first fixed lens group G1 with positive focal length, a first variable magnification lens group G2 with negative focal length, a second variable magnification lens group G3 with positive focal length, an aperture stop STO, a focusing lens group G4, a compensation lens group G5 with negative focal length, and an auxiliary variable magnification lens group G6 with positive focal length;

[0066] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, the compensating lens group G5, and the auxiliary zoom lens group G6 move along the main optical axis of the zoom lens;

[0067] The first fixed lens group G1 consists of, from the object plane side to the image plane side, a first fixed lens a1 with positive refractive power, a second fixed lens a2 with negative refractive power, a third fixed lens a3 with positive refractive power, a fourth fixed lens a4 with negative refractive power, a fifth fixed lens a5 with positive refractive power, and a sixth fixed lens a6 with positive refractive power. The first fixed lens a1 and the second fixed lens a2 are cemented together, and the fourth fixed lens a4 and the fifth fixed lens a5 are cemented together.

[0068] The focusing lens group G4 is formed by one lens;

[0069] The zoom lens satisfies the following conditional formula:

[0070] ft / fw≥60;

[0071] fnow<3.2;

[0072] Wherein, fw is the focal length of the zoom lens in the wide-angle state, ft is the focal length of the zoom lens in the telephoto state, and fnow is the aperture number of the zoom lens in the wide-angle state.

[0073] In this embodiment, by setting a plurality of moving groups, a zoom lens with a large focal length can achieve a large magnification while also achieving a smaller aperture number, thereby increasing the brightness of the zoom lens.

[0074] The first magnification lens group G2 is composed of a first magnification lens b1 with negative optical focal length, a second magnification lens b2 with negative optical focal length, a third magnification lens b3 with positive optical focal length, a fourth magnification lens b4 with negative optical focal length, and a fifth magnification lens b5 with positive optical focal length from the object plane side to the image plane side. The third magnification lens b3, the fourth magnification lens b4 and the fifth magnification lens b5 together constitute a triplet lens.

[0075] The second magnification lens group G3 is composed of a sixth magnification lens b6 with positive focal length, a seventh magnification lens b7 with positive focal length, an eighth magnification lens b8 with negative focal length, and a ninth magnification lens b9 with positive focal length from the object plane side to the image plane side, and the eighth magnification lens b8 and the ninth magnification lens b9 are cemented together.

[0076] The compensating lens group G5 consists of a first compensating lens d1 with positive refractive power and a second compensating lens d2 with negative refractive power in order from the object side to the image side. The first compensating lens d1 and the second compensating lens d2 are cemented together.

[0077] The auxiliary zoom group G6 is composed of a first auxiliary lens e1 with positive optical power, a second auxiliary lens e2 with negative optical power, and a third auxiliary lens e3 with positive optical power from the object side to the image side. The first auxiliary lens e1 and the second auxiliary lens e2 are glued together.

[0078] The first variable magnification lens group G2 satisfies the following conditional formula:

[0079] fb35 / fG2>15;

[0080] Wherein, fb35 is the combined focal length of the third to fifth variator lenses b3 to b5, and fG2 is the focal length of the first variator lens group G2.

[0081] By limiting the combined focal length of the third to fifth variator lenses b3 to b5, the chromatic aberration and astigmatism of the zoom lens are greatly improved, thereby improving the imaging quality.

[0082] The zoom lens satisfies the following conditional formula:

[0083] 2<fG3 / fw<4;

[0084] Wherein, fG3 is the focal length of the second variable magnification lens group G3.

[0085] In this embodiment, by limiting the focal length of the second variable magnification lens group G3, the zoom lens can be miniaturized while reducing the possibility of the focal length of the remaining lens groups being too large.

[0086] The zoom lens satisfies the following conditional formula:

[0087] -40<ft / fG5<-20;

[0088] 20<ft / fG6<40;

[0089] Among them, fG5 is the focal length of the compensation lens group G5, and fG6 is the focal length of the auxiliary zoom group G6.

[0090] By setting the focal length of the compensating lens group G5 and the auxiliary zoom group G6, the aberration and coma of the zoom lens are reduced, and the resolution of the zoom lens is increased.

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

[0092] 1<LG6 / fw<2;

[0093] Wherein, LG6 is the total optical length of the auxiliary zoom group G6.

[0094] By limiting the total optical length of the auxiliary zoom group G6, the auxiliary zoom group G6 can further correct light, reduce the possibility of aberration and coma in the zoom lens, and increase the resolution of the zoom lens.

[0095] The curved surface of the third auxiliary lens e3 facing the image plane is curved toward the image plane side;

[0096] The zoom lens satisfies the following conditional formula:

[0097] │Re32 / Re31│>2.5;

[0098] Re31 is the curvature radius of the curved surface of the third auxiliary lens e3 facing the object plane, and Re32 is the curvature radius of the curved surface of the third auxiliary lens e3 facing the image plane.

[0099] By limiting the curvature radius of the third auxiliary lens e3, the angle at which light enters the image plane is reduced, thereby reducing the dissipation of light when entering the image plane and increasing the brightness of the zoom lens.

[0100] The zoom lens satisfies the following conditional formula:

[0101] 2<DG2 / fw<5;

[0102] 2<DG3 / fw<4;

[0103] Wherein, DG2 is the moving distance of the first variator lens group G2, and DG3 is the moving distance of the second variator lens group G3.

[0104] By limiting the appropriate distance between the first zoom lens group G2 and the second zoom lens group G3, a larger zoom capability of the zoom lens is achieved, and the possibility of the zoom lens being too large can be avoided to a certain extent, thereby achieving miniaturization of the zoom lens.

[0105] Example 2

[0106] like Figures 1 to 3 As shown, a zoom lens is composed, from the object side to the image side, of a first fixed lens group G1 with positive power, a first variable power lens group G2 with negative power, a second variable power lens group G3 with positive power, an aperture stop STO, a focusing lens group G4 with negative power, a compensating lens group G5 with negative power, an auxiliary variable power group G6 with positive power, and an auxiliary assembly G7;

[0107] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, the compensating lens group G5, and the auxiliary zoom lens group G6 move along the main optical axis of the zoom lens;

[0108] The first fixed lens group G1 consists of, from the object plane side to the image plane side, a first fixed lens a1 with positive refractive power, a second fixed lens a2 with negative refractive power, a third fixed lens a3 with positive refractive power, a fourth fixed lens a4 with negative refractive power, a fifth fixed lens a5 with positive refractive power, and a sixth fixed lens a6 with positive refractive power. The first fixed lens a1 and the second fixed lens a2 are cemented together, and the fourth fixed lens a4 and the fifth fixed lens a5 are cemented together.

[0109] The first magnification lens group G2 is composed of a first magnification lens b1 with negative optical focal length, a second magnification lens b2 with negative optical focal length, a third magnification lens b3 with positive optical focal length, a fourth magnification lens b4 with negative optical focal length, and a fifth magnification lens b5 with positive optical focal length from the object plane side to the image plane side. The third magnification lens b3, the fourth magnification lens b4 and the fifth magnification lens b5 together constitute a triplet lens.

[0110] The second magnification lens group G3 is composed of a sixth magnification lens b6 with positive focal length, a seventh magnification lens b7 with positive focal length, an eighth magnification lens b8 with negative focal length, and a ninth magnification lens b9 with positive focal length from the object plane side to the image plane side, and the eighth magnification lens b8 and the ninth magnification lens b9 are cemented together.

[0111] The focusing lens group G4 is a first focusing lens c1 with negative optical power.

[0112] The compensating lens group G5 consists of a first compensating lens d1 with positive refractive power and a second compensating lens d2 with negative refractive power in order from the object side to the image side. The first compensating lens d1 and the second compensating lens d2 are cemented together.

[0113] The auxiliary zoom group G6 is composed of a first auxiliary lens e1 with positive optical power, a second auxiliary lens e2 with negative optical power, and a third auxiliary lens e3 with positive optical power from the object side to the image side. The first auxiliary lens e1 and the second auxiliary lens e2 are glued together.

[0114] The auxiliary component G7 includes a first protective glass CG1 and a second protective glass CG2.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] In Table 3, K is the cone coefficient, and e is the scientific notation, for example, e-05 represents 10 -5 .

[0119]

Table 1

[0120]

[0121]

[0122]

[0123]

Table 2

[0124] WIDE TELE D1 3.6 73.51 D2 131.05 1.92 D3 1 60.22 D4 3.53 3.39 D5 15.53 15.66 D6 29.7 74.99 D7 48.78 3.5

[0125]

Table 3

[0126]

[0127] In this embodiment, ft = 1200 mm, fw = 16.7 mm, fnow = 3.16, fnot = 11.36, TTL = 392 mm, ft / fw = 71.86;

[0128] Among them, fw is the focal length of the zoom lens in the wide-angle state, ft is the focal length of the zoom lens in the telephoto state, fnow is the aperture number of the zoom lens in the wide-angle state, fnot is the aperture number of the zoom lens in the telephoto state, and TTL is the total optical length of the zoom lens.

[0129] fb35=-442.45mm, fG2=-27.77mm, fb35 / fG2=15.93;

[0130] Wherein, fb35 is the combined focal length of the third to fifth variator lenses b3 to b5, and fG2 is the focal length of the first variator lens group G2.

[0131] fG3=51.83mm, fG3 / fw=3.1;

[0132] Wherein, fG3 is the focal length of the second variable magnification lens group G3.

[0133] fG5=-49mm; ft / fG5=-24.49;

[0134] fG6=41.3mm; fG6 / fw=29.06;

[0135] Among them, fG5 is the focal length of the compensation lens group G5, and fG6 is the focal length of the auxiliary zoom group G6.

[0136] LG6=24.68mm, LG6 / fw=1.48;

[0137] Wherein, LG6 is the total optical length of the auxiliary zoom group G6.

[0138] Re31=61.51mm, Re32=-21.21mm, │Re32 / Re31│=2.9;

[0139] Re31 is the curvature radius of the curved surface of the third auxiliary lens e3 facing the object plane, and Re32 is the curvature radius of the curved surface of the third auxiliary lens e3 facing the image plane.

[0140] DG2=69.91mm, DG3=59.22mm;

[0141] DG2 / fw=4.19; DG3 / fw=3.55;

[0142] Wherein, DG2 is the moving distance of the first variator lens group G2, and DG3 is the moving distance of the second variator lens group G3.

[0143] Example 3

[0144] like Figures 4 to 6As shown, a zoom lens is composed, from the object side to the image side, of a first fixed lens group G1 with positive power, a first variable power lens group G2 with negative power, a second variable power lens group G3 with positive power, an aperture stop STO, a focusing lens group G4 with negative power, a compensating lens group G5 with negative power, an auxiliary variable power group G6 with positive power, and an auxiliary assembly G7;

[0145] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, the compensating lens group G5, and the auxiliary zoom lens group G6 move along the main optical axis of the zoom lens;

[0146] The first fixed lens group G1 consists of, from the object plane side to the image plane side, a first fixed lens a1 with positive refractive power, a second fixed lens a2 with negative refractive power, a third fixed lens a3 with positive refractive power, a fourth fixed lens a4 with negative refractive power, a fifth fixed lens a5 with positive refractive power, and a sixth fixed lens a6 with positive refractive power. The first fixed lens a1 and the second fixed lens a2 are cemented together, and the fourth fixed lens a4 and the fifth fixed lens a5 are cemented together.

[0147] The first magnification lens group G2 is composed of a first magnification lens b1 with negative optical focal length, a second magnification lens b2 with negative optical focal length, a third magnification lens b3 with positive optical focal length, a fourth magnification lens b4 with negative optical focal length, and a fifth magnification lens b5 with positive optical focal length from the object plane side to the image plane side. The third magnification lens b3, the fourth magnification lens b4 and the fifth magnification lens b5 together constitute a triplet lens.

[0148] The second magnification lens group G3 is composed of a sixth magnification lens b6 with positive focal length, a seventh magnification lens b7 with positive focal length, an eighth magnification lens b8 with negative focal length, and a ninth magnification lens b9 with positive focal length from the object plane side to the image plane side, and the eighth magnification lens b8 and the ninth magnification lens b9 are cemented together.

[0149] The focusing lens group G4 is a first focusing lens c1 with negative optical power.

[0150] The compensating lens group G5 consists of a first compensating lens d1 with positive refractive power and a second compensating lens d2 with negative refractive power in order from the object side to the image side. The first compensating lens d1 and the second compensating lens d2 are cemented together.

[0151] The auxiliary zoom group G6 is composed of a first auxiliary lens e1 with positive optical power, a second auxiliary lens e2 with negative optical power, and a third auxiliary lens e3 with positive optical power from the object side to the image side. The first auxiliary lens e1 and the second auxiliary lens e2 are glued together.

[0152] The auxiliary component G7 includes a first protective glass CG1 and a second protective glass CG2.

[0153] 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.

[0154] 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.

[0155] In Table 5, the WIDE column indicates the specific values ​​of the various variable parameters when the zoom lens is at the wide-angle end, and the TELE column indicates the specific values ​​of the various variable parameters when the zoom lens is at the telephoto end. In Table 6, K is the cone coefficient, and e is the scientific notation, for example, e-05 represents 10 -5 .

[0156]

Table 4

[0157]

[0158]

[0159]

Table 5

[0160] WIDE TELE D1 4.85 71.59 D2 122.4 1.94 D3 1.41 55.13 D4 10.99 3.27 D5 7.78 15.5 D6 34.08 77.01 D7 43.94 1

[0161]

Table 6

[0162]

[0163] In this embodiment, ft = 1200 mm, fw = 19 mm, fnow = 2.88, fnot = 11.75, TTL = 385 mm, ft / fw = 63.16;

[0164] Among them, fw is the focal length of the zoom lens in the wide-angle state, ft is the focal length of the zoom lens in the telephoto state, fnow is the aperture number of the zoom lens in the wide-angle state, fnot is the aperture number of the zoom lens in the telephoto state, and TTL is the total optical length of the zoom lens.

[0165] fb35=-687.05mm, fG2=-27.32mm, fb35 / fG2=25.15;

[0166] Wherein, fb35 is the combined focal length of the third to fifth variator lenses b3 to b5, and fG2 is the focal length of the first variator lens group G2.

[0167] fG3=51.05mm, fG3 / fw=2.69;

[0168] Wherein, fG3 is the focal length of the second variable magnification lens group G3.

[0169] fG5=-49mm; ft / fG5=24.49;

[0170] fG6=40.34mm; ft / fG6=29.75;

[0171] Among them, fG5 is the focal length of the compensation lens group G5, and fG6 is the focal length of the auxiliary zoom group G6.

[0172] LG6=24.58mm, LG6 / fw=1.29;

[0173] Wherein, LG6 is the total optical length of the auxiliary zoom group G6.

[0174] Re31=132.75mm, Re32=-18.95mm, │Re32 / Re31│=7;

[0175] Re31 is the curvature radius of the curved surface of the third auxiliary lens e3 facing the object plane, and Re32 is the curvature radius of the curved surface of the third auxiliary lens e3 facing the image plane.

[0176] DG2=66.74mm, DG3=53.72mm;

[0177] DG2 / fw=3.51; DG3 / fw=2.83;

[0178] Wherein, DG2 is the moving distance of the first variator lens group G2, and DG3 is the moving distance of the second variator lens group G3.

[0179] Example 4

[0180] like Figures 7 to 9 As shown, a zoom lens is composed, from the object side to the image side, of a first fixed lens group G1 with positive power, a first variable power lens group G2 with negative power, a second variable power lens group G3 with positive power, an aperture stop STO, a focusing lens group G4 with negative power, a compensating lens group G5 with negative power, an auxiliary variable power group G6 with positive power, and an auxiliary assembly G7;

[0181] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, the compensating lens group G5, and the auxiliary zoom lens group G6 move along the main optical axis of the zoom lens;

[0182] The first fixed lens group G1 consists of, from the object plane side to the image plane side, a first fixed lens a1 with positive refractive power, a second fixed lens a2 with negative refractive power, a third fixed lens a3 with positive refractive power, a fourth fixed lens a4 with negative refractive power, a fifth fixed lens a5 with positive refractive power, and a sixth fixed lens a6 with positive refractive power. The first fixed lens a1 and the second fixed lens a2 are cemented together, and the fourth fixed lens a4 and the fifth fixed lens a5 are cemented together.

[0183] The first magnification lens group G2 is composed of a first magnification lens b1 with negative optical focal length, a second magnification lens b2 with negative optical focal length, a third magnification lens b3 with positive optical focal length, a fourth magnification lens b4 with negative optical focal length, and a fifth magnification lens b5 with positive optical focal length from the object plane side to the image plane side. The third magnification lens b3, the fourth magnification lens b4 and the fifth magnification lens b5 together constitute a triplet lens.

[0184] The second magnification lens group G3 is composed of a sixth magnification lens b6 with positive focal length, a seventh magnification lens b7 with positive focal length, an eighth magnification lens b8 with negative focal length, and a ninth magnification lens b9 with positive focal length from the object plane side to the image plane side, and the eighth magnification lens b8 and the ninth magnification lens b9 are cemented together.

[0185] The focusing lens group G4 is a first focusing lens c1 with negative optical power.

[0186] The compensating lens group G5 consists of a first compensating lens d1 with positive refractive power and a second compensating lens d2 with negative refractive power in order from the object side to the image side. The first compensating lens d1 and the second compensating lens d2 are cemented together.

[0187] The auxiliary zoom group G6 is composed of a first auxiliary lens e1 with positive optical power, a second auxiliary lens e2 with negative optical power, and a third auxiliary lens e3 with positive optical power from the object side to the image side. The first auxiliary lens e1 and the second auxiliary lens e2 are glued together.

[0188] The auxiliary component G7 includes a first protective glass CG1 and a second protective glass CG2.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] In Table 9, K is the cone coefficient, and e is the scientific notation, for example, e-05 represents 10 -5 .

[0193]

Table 7

[0194]

[0195]

[0196]

Table 8

[0197] WIDE TELE D1 18.54 71.62 D2 109.64 1.34 D3 0.1 55.32 D4 5.62 2.31 D5 10.82 14.13 D6 33.07 69.12 D7 36.14 0.1

[0198]

Table 9

[0199]

[0200] In this embodiment, ft=1200 mm, fw=20 mm, fnow=2.88, fnot=11.75, TTL=380 mm, ft / fw=60;

[0201] Among them, fw is the focal length of the zoom lens in the wide-angle state, ft is the focal length of the zoom lens in the telephoto state, fnow is the aperture number of the zoom lens in the wide-angle state, fnot is the aperture number of the zoom lens in the telephoto state, and TTL is the total optical length of the zoom lens.

[0202] fb35=-607.19mm, fG2=-27.31mm, fb35 / fG2=22.23;

[0203] Wherein, fb35 is the combined focal length of the third to fifth variator lenses b3 to b5, and fG2 is the focal length of the first variator lens group G2.

[0204] fG3=51.57mm, fG3 / fw=2.58;

[0205] Wherein, fG3 is the focal length of the second variable magnification lens group G3.

[0206] fG5=-31.36mm; ft / fG5=38.27;

[0207] fG6=32.11mm; fG6 / fw=37.37;

[0208] Among them, fG5 is the focal length of the compensation lens group G5, and fG6 is the focal length of the auxiliary zoom group G6.

[0209] LG6=22.068mm, LG6 / fw=1.1;

[0210] Wherein, LG6 is the total optical length of the auxiliary zoom group G6.

[0211] Re31=247.42mm, Re31=-18.26mm, │Re32 / Re31│=15.55;

[0212] Re31 is the curvature radius of the curved surface of the third auxiliary lens e3 facing the object plane, and Re32 is the curvature radius of the curved surface of the third auxiliary lens e3 facing the image plane.

[0213] DG2=53.08mm, DG3=55.22mm;

[0214] DG2 / fw=2.65; DG3 / fw=2.76;

[0215] Wherein, DG2 is the moving distance of the first variator lens group G2, and DG3 is the moving distance of the second variator lens group G3.

[0216] Example 5

[0217] An imaging device, such as Figures 1 to 9 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.

[0218] 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 a first fixed lens group with positive optical power, a first variable magnification lens group with negative optical power, a second variable magnification lens group with positive optical power, an aperture, a focusing lens group, a compensation lens group with negative optical power, and an auxiliary variable magnification lens group with positive optical power, from the object side to the image side. The first zoom lens group, the second zoom lens group, the focusing lens group, the compensating lens group, and the auxiliary zoom lens group move along the main optical axis of the zoom lens; The first fixed lens group is composed of, from the object plane side to the image plane side, a first fixed lens with positive optical power, a second fixed lens with negative optical power, a third fixed lens with positive optical power, a fourth fixed lens with negative optical power, a fifth fixed lens with positive optical power, and a sixth fixed lens with positive optical power. The first fixed lens and the second fixed lens are cemented together, and the fourth fixed lens and the fifth fixed lens are cemented together. The focusing lens group is formed by one lens; The zoom lens satisfies the following conditional formula: ft / fw≥60; fnow<3.2; 2<fG3 / fw<4; 1<LG6 / fw<2; Among them, fw is the focal length of the zoom lens in the wide-angle state, ft is the focal length of the zoom lens in the telephoto state, fnow is the aperture number of the zoom lens in the wide-angle state, fG3 is the focal length of the second zoom lens group, and LG6 is the total optical length of the auxiliary zoom group.

2. The zoom lens according to claim 1, wherein: The first zoom lens group consists of, from the object side to the image side, a first zoom lens with negative optical power, a second zoom lens with negative optical power, a third zoom lens with positive optical power, a fourth zoom lens with negative optical power, and a fifth zoom lens with positive optical power. The third zoom lens, the fourth zoom lens and the fifth zoom lens together constitute a triplet lens.

3. The zoom lens according to claim 1, wherein: The second magnification lens group is composed of a sixth magnification lens with positive focal length, a seventh magnification lens with positive focal length, an eighth magnification lens with negative focal length, and a ninth magnification lens with positive focal length from the object side to the image side, and the eighth magnification lens and the ninth magnification lens are cemented together.

4. The zoom lens according to claim 1, wherein: The compensation lens group is composed of a first compensation lens with positive optical power and a second compensation lens with negative optical power in sequence from the object plane side to the image plane side, and the first compensation lens and the second compensation lens are cemented together.

5. The zoom lens according to claim 1, wherein: The auxiliary zoom group is composed of a first auxiliary lens with positive optical power, a second auxiliary lens with negative optical power, and a third auxiliary lens with positive optical power from the object side to the image side, and the first auxiliary lens and the second auxiliary lens are glued together.

6. The zoom lens according to claim 2, wherein: The first zoom lens group satisfies the following conditional formula: fb35 / fG2>15; Wherein, fb35 is the combined focal length of the third to fifth variator lenses, and fG2 is the focal length of the first variator lens group.

7. The zoom lens according to claim 1, wherein: The zoom lens satisfies the following conditional formula: -40<ft / fG5<-20; 20<ft / fG6<40; Among them, fG5 is the focal length of the compensation lens group, and fG6 is the focal length of the auxiliary zoom group.

8. The zoom lens according to claim 5, wherein: The curved surface of the third auxiliary lens facing the image plane is curved toward the image plane side; The zoom lens satisfies the following conditional formula: │Re32 / Re31│>2.5; Re31 is the curvature radius of the curved surface of the third auxiliary lens facing the object plane, and Re32 is the curvature radius of the curved surface of the third auxiliary lens facing the image plane.

9. The zoom lens according to claim 1, wherein: The zoom lens satisfies the following conditional formula: 2<DG2 / fw<5; 2<DG3 / fw<4; Wherein, DG2 is the moving distance of the first zoom lens group, and DG3 is the moving distance of the second zoom lens group.

10. An imaging device, characterized in that: include: The zoom lens according to any one of claims 1 to 9; and an imaging element configured to receive an image formed by the zoom lens.

Images