CN113805323A - Zoom lens - Google Patents
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- CN113805323A CN113805323A CN202111191896.2A CN202111191896A CN113805323A CN 113805323 A CN113805323 A CN 113805323A CN 202111191896 A CN202111191896 A CN 202111191896A CN 113805323 A CN113805323 A CN 113805323A
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- 230000003287 optical effect Effects 0.000 claims abstract description 64
- 238000003384 imaging method Methods 0.000 abstract description 5
- 230000004075 alteration Effects 0.000 description 19
- 239000000463 material Substances 0.000 description 14
- 239000006185 dispersion Substances 0.000 description 3
- 235000012149 noodles Nutrition 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145129—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+++
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
Abstract
The present invention relates to a zoom lens, including: a first fixed lens group (G1) with positive focal power, a first zoom lens group (G2) with negative focal power, an aperture Stop (STO), a second fixed lens group (G3) with positive focal power, a second zoom lens group (G4) with positive focal power and a focusing lens group (G5) which are arranged in sequence from the object side to the image side along the optical axis, wherein the focal power of the focusing lens group (G5) is positive; the first zoom lens group (G2), the second zoom lens group (G4), and the focus lens group (G5) are all movable in an optical axis direction. The invention adopts five groups of structures of 'positive-negative-positive' and three groups of linkage modes of 'two times of zoom and one focusing', realizes the zoom ratio of more than 30 times, the maximum aperture can reach F1.4, and the invention is compatible with large zoom ratio, small volume and large aperture, ensures the day and night infrared confocal of the 1X-20X focal length section, and realizes the 4K imaging of the full focal length section.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a zoom lens.
Background
The telescopic end resolution of the existing large-magnification zoom lens is mostly at the level of 2M, the infrared defocusing amount of the large-magnification zoom lens is large, day and night confocal cannot be realized, and the working requirement of a complex application scene is difficult to meet. Further, the zoom ratio of the zoom lens and the front end diameter and the total length of the lens are in a mutually restricted relationship, and it is difficult to achieve miniaturization.
Chinese patent CN112068294A discloses a zoom lens. The lens comprises a first fixed lens group, a first zoom lens group, an aperture stop, a second fixed lens group, a second zoom lens group, a focusing lens group and a third zoom lens group in sequence along the direction from the object side to the image side. The zoom lens adopts a six-group structure with focal power of positive-negative-positive-negative-positive and a four-group linkage mode of three times of zoom and one focusing in sequence, realizes zoom ratio of more than 20 times, and realizes full-focus 4K imaging. However, the zoom lens cannot meet the application requirement of higher zoom ratio, and the design of the structure is still to be improved.
Disclosure of Invention
In order to meet the requirement of higher required zoom ratio, the invention provides the zoom lens with a more simplified structure.
To achieve the above object, the present invention provides a zoom lens including: the zoom lens comprises a first fixed lens group with positive focal power, a first zoom lens group with negative focal power, an aperture diaphragm, a second fixed lens group with positive focal power, a second zoom lens group with positive focal power and a focusing lens group which are sequentially arranged from an object side to an image side along an optical axis, wherein the focal power of the focusing lens group is positive; the first zoom lens group, the second zoom lens group, and the focus lens group are all movable in an optical axis direction.
According to one aspect of the invention, the focal length FG1 of the first fixed lens group satisfies: FG1/FW is more than or equal to 8 and less than or equal to 11.6;
a focal length FG2 of the first zoom lens group satisfies: FG2/FW is not less than-2.5 and not more than-1.7;
a focal length FG4 of the second zoom lens group satisfies: FG4/FW is more than or equal to 2.8 and less than or equal to 4.5;
where FW is the focal length at the wide-angle end of the zoom lens.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the first fixed lens group sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power and a fourth lens with positive focal power.
According to one aspect of the invention, the first lens has a convex object-side surface and a concave image-side surface;
the second lens, the third lens, and the fourth lens are convex on an object side.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the first zoom lens group sequentially comprises a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with negative focal power, an eighth lens with positive focal power and a ninth lens with negative focal power.
According to one aspect of the invention, the image side surface of the fifth lens is concave;
the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex;
the object side surface and the image side surface of the seventh lens are both concave.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the second fixed lens group sequentially includes a tenth lens having a positive refractive power and an eleventh lens having a negative refractive power.
According to an aspect of the invention, both the object-side surface and the image-side surface of the tenth lens are convex.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the second zoom lens group sequentially comprises a twelfth lens with positive focal power, a thirteenth lens with positive focal power, a fourteenth lens with negative focal power, a fifteenth lens with positive focal power, a sixteenth lens with positive or negative focal power and a seventeenth lens.
According to one aspect of the invention, both the object side surface and the image side surface of the twelfth lens are convex;
the object side surfaces of the thirteenth lens and the fifteenth lens are both convex;
the image side surface of the fourteenth lens is concave.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the focusing lens group sequentially comprises an eighteenth lens with positive or negative focal power, a nineteenth lens with negative focal power and a twentieth lens with positive focal power.
According to an aspect of the present invention, the first lens and the second lens, the sixteenth lens and the seventeenth lens are respectively cemented to form a double cemented lens assembly;
the thirteenth lens, the fourteenth lens and the fifteenth lens are cemented together to form a triple cemented lens group.
According to one aspect of the present invention, the zoom lens includes at least one aspheric lens.
According to an aspect of the invention, Abbe number Ab of a material of the sixth lens6Abbe number Ab of material of eighth lens8The following relationships are satisfied: ab6≤30；Ab8≤30。
According to an aspect of the present invention, Abbe number Ab of a material of the seventeenth lens17The following relationship is satisfied: ab17≤32。
According to an aspect of the present invention, the stroke D2 of the first zoom lens group and the stroke D4 of the second zoom lens group satisfy the following relationship: the absolute value of D2/D4 is more than or equal to 1.5 and less than or equal to 2.0.
According to an aspect of the invention, the focal length FG2 of the first zoom lens group and the focal length FG4 of the second zoom lens group satisfy the following relationship: FG2/FG4 is less than or equal to-0.82 and less than or equal to-0.32.
According to an aspect of the invention, the maximum lens diameter Φ G1 of the first fixed lens group and the total zoom lens length TTL satisfy the following relationship: phi G1/TTL is less than or equal to 0.195.
According to the scheme of the invention, the zoom lens adopts a five-group structure of positive-negative-positive and a three-group linkage mode of two-zoom and one-focusing, the zoom ratio is over 30 times, and the maximum aperture can reach F1.4. The zoom lens realizes the compatibility of large magnification and small volume, can ensure the infrared confocal of a 1X-20X focal length section while realizing large magnification ratio, small volume and large aperture, and simultaneously the resolution ratio of a full focal length section meets 4K.
According to one aspect of the present invention, correction of chromatic aberration is facilitated by appropriately allocating and designing the number of lenses, the lens surface types, and the lens powers in the five lens groups. Through reasonable focal power distribution and selection of specific glass materials, chromatic aberration and secondary spectrum correction between 380 nm and 940nm of a long focal end are realized, infrared confocal of a 1X-20X focal length section is met, and application requirements of various complex scenes are met. Furthermore, a reasonable power distribution may also correct lens element tolerances.
According to one scheme of the invention, by arranging the double-cemented lens group and the triple-cemented lens group, chromatic aberration is effectively corrected, the resolution of the lens is improved, day and night confocal can be realized, and the assembly is good.
According to one scheme of the invention, the design of the aspheric lenses in the lens and the reasonable distribution of the number of the aspheric lenses in the lens can effectively correct various aberrations of the lens and further improve the resolution.
According to one scheme of the invention, by using the iris diaphragm, the maximum aperture can reach F1.4, and the use requirements of various application scenes are met.
According to one scheme of the invention, through enabling the Abbe numbers of materials of the sixth lens and the eighth lens to both meet the requirement of not more than 30 and the Abbe number of the material of the seventeenth lens to meet the requirement of not more than 32, namely the design of the specific dispersion coefficient lens, not only chromatic aberration is effectively corrected and day and night confocal is realized, but also aberration change generated in the zooming process of the zoom lens can be reduced, and the high-resolution effect is realized.
According to one scheme of the invention, the zoom lens can realize the compatibility of large multiplying power and small volume by reasonably setting the focal lengths and the movable stroke proportion of the two zoom lens groups. In addition, the zoom lens can be further miniaturized by defining the maximum lens diameter in the first fixed group.
Drawings
FIG. 1 is a schematic view showing a configuration of a zoom lens according to a first embodiment of the present invention;
FIG. 2 schematically shows a defocus graph of a zoom lens according to a first embodiment of the present invention at the wide-angle end;
FIG. 3 is a view schematically showing a defocus graph at the telephoto end of a zoom lens according to a first embodiment of the present invention;
FIG. 4 schematically shows a 850nm out-of-focus curve diagram at the wide-angle end of a zoom lens according to a first embodiment of the present invention;
FIG. 5 is a schematic view showing a configuration of a zoom lens according to a second embodiment of the present invention;
FIG. 6 is a defocus graph schematically illustrating a zoom lens according to a second embodiment of the present invention at the wide-angle end;
FIG. 7 is a view schematically showing a defocus graph at the telephoto end in a zoom lens according to a second embodiment of the present invention;
FIG. 8 is a view schematically showing a 850nm defocus curve of a zoom lens according to a second embodiment of the present invention at the wide-angle end;
FIG. 9 is a schematic view showing a configuration of a zoom lens according to a third embodiment of the present invention;
FIG. 10 schematically shows a defocus graph at the wide-angle end of a zoom lens according to a third embodiment of the present invention;
FIG. 11 is a view schematically showing a defocus graph at the telephoto end in a zoom lens according to a third embodiment of the present invention;
fig. 12 schematically shows a 850nm defocus graph at the wide-angle end of a zoom lens according to a third embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
As shown in fig. 1, a zoom lens of the present invention includes: a first fixed lens group G1 having positive power, a first zoom lens group G2 having negative power, an aperture stop STO, a second fixed lens group G3 having positive power, a second zoom lens group G4 having positive power, and a focus lens group G5 having positive power, which are arranged in this order from the object side to the image side along the optical axis. The first zoom lens group G2 and the second zoom lens group G4 are both movable in the optical axis direction for achieving optical zooming of the zoom lens between the wide-angle end and the telephoto end; the focus lens group G5 is movable in the optical axis direction for compensating for the change in the image plane position during optical zooming.
Through the arrangement, the focal power of the group is reasonably distributed by adopting a five-group framework of positive-negative-positive and a three-group linkage mode of two-zoom and one-focus, the zoom ratio exceeding 30 times can be realized, the performance requirements of high magnification, small volume and large target surface are met, and the full-focus 4K imaging is realized. By using the iris diaphragm, the maximum aperture of the lens can reach F1.4, and the use requirements of various application scenes are met.
In the present invention, the focal length FG1 of the first fixed lens group G1, the focal length FG2 of the first zoom lens group G2, and the focal length FG4 of the second zoom lens group G4 satisfy: FG1/FW is more than or equal to 8 and less than or equal to 11.6; FG2/FW is not less than-2.5 and not more than-1.7; FG4/FW is more than or equal to 2.8 and less than or equal to 4.5. Where FW is the focal length at the wide-angle end of the zoom lens. The focal length of the lens group is adjusted reasonably through setting, compatibility of large multiplying power and small size is achieved, and the resolution of the full focal length section of the lens can meet 4K.
In the present invention, the first fixed lens group G1 includes, in order from the object side to the image side along the optical axis, a first lens L1 having negative optical power, a second lens L2 having positive optical power, a third lens L3 having positive optical power, and a fourth lens L4 having positive optical power. The first lens L1 is a convex-concave lens, and the second lens L2, the third lens L3, and the fourth lens L4 are convex lenses on the object side.
The first zoom lens group G2 includes, in order, a fifth lens L5 having negative optical power, a sixth lens L6 having positive optical power, a seventh lens L7 having negative optical power, an eighth lens L8 having positive optical power, and a ninth lens L9 having negative optical power. The fifth lens L5 is a concave lens with a concave image-side surface, the sixth lens L6 is a meniscus lens, and the seventh lens L7 is a concave-concave lens.
The second fixed lens group G3 includes, in order, a tenth lens L10 having a positive optical power and an eleventh lens L11 having a negative optical power. Among them, the tenth lens L10 is a convex lens.
The second zoom lens group G4 includes, in order, a twelfth lens L12 having positive optical power, a thirteenth lens L13 having positive optical power, a fourteenth lens L14 having negative optical power, a fifteenth lens L15 having positive optical power, a sixteenth lens L16 having positive optical power or negative optical power, and a seventeenth lens L17. The twelfth lens L12 is a convex-convex lens, the thirteenth lens L13 and the fifteenth lens L15 are each a lens whose object-side surface is convex, and the fourteenth lens L14 is a lens whose image-side surface is concave.
The focus lens group G5 includes, in order, an eighteenth lens L18 having positive or negative power, a nineteenth lens L19 having negative power, and a twentieth lens L20 having positive power.
In the present invention, the zoom lens includes three fixed cemented lens groups, and in addition to the following lenses, other lenses may be cemented to form the cemented lens group. The first lens L1, the second lens L2, the sixteenth lens L16 and the seventeenth lens L17 are respectively cemented to form a double cemented lens group, and the thirteenth lens L13, the fourteenth lens L14 and the fifteenth lens L15 are cemented to form a triple cemented lens group. The design of the cemented lens group structure can effectively correct imaging chromatic aberration, improve resolution, realize day and night infrared confocal, and has good assembly.
In the present invention, the zoom lens includes at least one aspheric lens. By combining the aspheric lens and the spherical lens, various aberrations can be effectively corrected, and the resolution of the lens is further improved.
The five-group structure comprises 20 lenses in total, and the focal power of each lens is reasonably distributed, so that the lens element tolerance can be corrected, and the assembly processability is good. Besides reasonably distributing the focal power of the lens, the specific glass material is selected for the lens, the shapes of the two surfaces of the lens are reasonably designed, chromatic aberration and secondary spectrum correction between 380 nm and 940nm of a long focal end are realized, infrared confocal of a 1X-20X focal length section can be met, and the application requirements of various complex scenes are met.
In the present invention, Abbe number Ab of the material of sixth lens L66Abbe number Ab of material of eighth lens L88The following relationships are satisfied: ab6≤30；Ab8Less than or equal to 30. Through specific design of the dispersion coefficients of the sixth lens L6 and the eighth lens L8, chromatic aberration can be effectively corrected, and day and night confocal is realized. Abbe number Ab of material of seventeenth lens L1717The following relationship is satisfied: ab17Less than or equal to 32. By specially designing the dispersion coefficient of the seventeenth lens L17, the aberration variation generated during zooming of the zoom lens can be reduced, thereby achieving the high resolution effect of the lens.
In the present invention, the stroke D2 of the first zoom lens group G2 and the stroke D4 of the second zoom lens group G4 satisfy the following relationship: the absolute value of D2/D4 is more than or equal to 1.5 and less than or equal to 2.0. A focal length FG2 of the first zoom lens group G2 and a focal length FG4 of the second zoom lens group G4 satisfy the following relationship: FG2/FG4 is less than or equal to-0.82 and less than or equal to-0.32. The focal lengths and the stroke proportion of the two zoom lens groups are reasonably set, and the compatibility of large magnification and miniaturization of the lens is realized. The maximum lens diameter Φ G1 of the first fixed lens group G1 and the total zoom lens length TTL satisfy the following relationship: phi G1/TTL is less than or equal to 0.195. This makes the zoom lens more compact.
In summary, the present invention adopts five groups of structures with focal powers of "positive-negative-positive" and three groups of linkage modes of "two variable power and one focusing", which include 20 lenses in total, and is compatible with large power and small volume, thereby realizing a variable power ratio exceeding 30 times, and a maximum aperture reaching F1.4. Meanwhile, the cemented lens group, the lens focal power, the lens shape and the lens material are reasonably arranged, so that the position chromatic aberration, the magnification chromatic aberration and the secondary spectrum correction of a long focal end between 380 nm and 940nm are realized, and the day and night infrared confocal of a 1X-20X focal length section is met. The 4K high-resolution imaging of the full-focus section is realized by reasonably distributing the focal lengths of the lens groups.
The zoom lens is specifically described below in three specific groups of embodiments. In the following embodiments, the object side surface is denoted as OBJ, the image side surface is denoted as IMA, and the cemented surface of the cemented lens group is denoted as one surface, for example, 3 surfaces are provided for a double cemented lens group consisting of 2 cemented lenses, and 4 surfaces are provided for a triple cemented lens group consisting of 3 cemented lenses.
The parameters of each embodiment specifically satisfying the above conditional expressions are shown in table 1 below:
| relation formula | First embodiment | Second embodiment | Third embodiment |
| 8≤FG1/FW≤11.6 | 9 | 10.5 | 11.5 |
| -2.5≤FG2/FW≤-1.7 | -2.3 | -2.4 | -1.8 |
| 2.8≤FG4/FW≤4.5 | 4.2 | 2.9 | 4.2 |
| Ab6≤30 | 23.8 | 25.5 | 23.8 |
| Ab8≤30 | 19.3 | 18.9 | 23.8 |
| Ab17≤32 | 31.4 | 20.9 | 16.5 |
| 1.5≤|D2/D4|≤2.0 | 1.96 | 1.78 | 1.51 |
| -0.82≤FG2/FG4≤-0.32 | -0.34 | -0.82 | -0.56 |
| G1/TTL≤0.195 | 0.15 | 0.19 | 0.16 |
TABLE 1
In the present invention, the aspherical lens of the zoom lens satisfies the following formula:
in the above formula, z is the axial distance from the curved surface to the vertex at the position of the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k is the conic constant of the surface; a. the4、A6、A8、A10、A12、A14、A16The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
First embodiment
Referring to fig. 1 to 4, in the present embodiment, the zoom lens employs a total of 20 lenses. And 5 cemented lens groups are adopted, as shown in fig. 1, which are 3 double cemented lens groups formed by a first lens L1 and a second lens L2, a sixteenth lens L16 and a seventeenth lens L17, an eighteenth lens L18 and a nineteenth lens L19 cemented together, and 2 triple cemented lens groups formed by a sixth lens L6, a seventh lens L7 and an eighth lens L8, a thirteenth lens L13, a fourteenth lens L14 and a fifteenth lens L15 cemented together.
The parameters of each lens of the zoom lens according to the present embodiment include a surface type, a curvature radius (R value), a thickness, a refractive index of a material, and an abbe number, as shown in table 2 below:
TABLE 2
The aspherical surface coefficients of the aspherical lenses of the zoom lens according to the present embodiment include a conic constant K and a fourth-order aspherical surface coefficient a4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12As shown in table 3 below.
| Number of noodles | K | A4 | A6 | A8 | A10 | A12 |
| S21 | -1.2215584 | 6.57E-06 | 3.07E-08 | -1.55E-10 | 5.94E-13 | 0 |
| S22 | 0.82231244 | 1.88E-05 | 1.47E-08 | -1.89E-10 | 7.11 |
0 |
TABLE 3
The zoom lens according to the present embodiment has variable magnification data at the wide angle end and the telephoto end as shown in table 4 below.
TABLE 4
As can be seen from fig. 1 to 4, the zoom lens of the present embodiment employs 20 lenses, realizes a maximum aperture of 1.6, has a zoom ratio of more than 30 times, can correct 380-940 nm positional chromatic aberration and magnification chromatic aberration, realizes 1X-20X focal length end day and night infrared confocal, and satisfies a full focal length 4K resolution. Meanwhile, the lens is an optical zoom system of small size and large magnification. And has good assembly processability and higher production yield. Fig. 2 to 4 reflect the performance of the zoom lens according to the present embodiment.
Second embodiment
Referring to fig. 5 to 8, in the present embodiment, the zoom lens employs a total of 20 lenses and 4 cemented lens groups, i.e., 3 double cemented lens groups cemented by a first lens L1 and a second lens L2, a sixth lens L6 and a seventh lens L7, and a sixteenth lens L16 and a seventeenth lens L17, and 1 triple cemented lens group cemented by a thirteenth lens L13, a fourteenth lens L14 and a fifteenth lens L15, as shown in fig. 5.
The parameters of each lens of the zoom lens according to the present embodiment include a surface type, a curvature radius (R value), a thickness, a refractive index of a material, and an abbe number, as shown in table 5 below:
TABLE 5
The aspherical surface coefficients of the aspherical lenses of the zoom lens according to the present embodiment include a conic constant K and a fourth-order aspherical surface coefficient a4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12As shown in table 6 below.
| Number of noodles | K | A4 | A6 | A8 | A10 | A12 |
| S22 | 3.54E-01 | -3.87E-06 | 3.34E-08 | -9.75E-10 | 1.58E-11 | -9.87E-13 |
| S23 | -1.20E+00 | 1.20E-05 | 1.54E-08 | -7.02E-10 | 5.18E-11 | -1.73E-13 |
TABLE 6
The zoom lens according to the present embodiment has variable magnification data at the wide angle end and the telephoto end as shown in table 7 below.
| Wide angle end | Telescope end | |
| T1 | 0.82 | 39.02 |
| T2 | 39.4 | 1.2 |
| T3 | 23 | 1.5 |
| T4 | 3 | 19.4 |
| T5 | 4.685 | 9.785 |
TABLE 7
As can be seen from fig. 5 to 8, the zoom lens of the present embodiment employs 20 lenses, the aperture at the wide-angle end can reach 1.4, the zoom ratio exceeds 30 times, and positional chromatic aberration and magnification chromatic aberration between 380 nm and 940nm can be corrected, so that day and night infrared confocal at a focal length of 1X-20X is realized, and a resolution of a full focal length of 4K is satisfied. Meanwhile, the lens is an optical zoom system which is small in size, large in aperture, and suitable for low-illumination scenes and high in magnification. Fig. 6 to 8 reflect the performance of the zoom lens according to the present embodiment.
Third embodiment
Referring to fig. 9 to 12, in the present embodiment, the zoom lens employs a total of 20 lenses and 6 cemented lens groups, as shown in fig. 9, 5 double cemented lens groups cemented by a first lens L1 and a second lens L2, a sixth lens L6 and a seventh lens L7, an eighth lens L8 and a ninth lens L9, a sixteenth lens L16 and a seventeenth lens L17, a nineteenth lens L19 and a twentieth lens L20, and 1 triple cemented lens group cemented by a thirteenth lens L13, a fourteenth lens L14 and a fifteenth lens L15, respectively.
The parameters of each lens of the zoom lens according to the present embodiment include a surface type, a curvature radius (R value), a thickness, a refractive index of a material, and an abbe number, as shown in table 8 below:
TABLE 8
The aspherical surface coefficients of the aspherical lenses of the zoom lens according to the present embodiment include a conic constant K and a fourth-order aspherical surface coefficient a4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12As shown in table 9 below.
| Number of noodles | K | A4 | A6 | A8 | A10 | A12 |
| S21 | -1.099E+00 | 5.325E-06 | 2.760E-08 | -1.391E-10 | 5.350E-13 | 0.00E+00 |
| S22 | 7.401E-01 | 1.695E-05 | 1.320E-08 | -1.698E-10 | 6.395E-13 | 0.00E+00 |
TABLE 9
The zoom lens according to the present embodiment has variable magnification data at the wide angle end and the telephoto end as shown in table 10 below.
| Wide angle end | Telescope end | |
| T1 | 0.8 | 40.5 |
| T2 | 40.70 | 1.0 |
| T3 | 27.76 | 1.5 |
| T4 | 2.72 | 12.31 |
| T5 | 2.92 | 19.59 |
Watch 10
As can be seen from fig. 9 to 12, the zoom lens of the present embodiment employs 20 lenses, one of which is an aspheric lens. The aperture at the wide-angle end can reach 1.4, the zoom ratio exceeds 30 times, the position chromatic aberration and the magnification chromatic aberration between 380 nm and 940nm can be corrected, the infrared defocusing amount is reduced, the day and night infrared confocal condition of 1X-20X is met, and the resolution of a full focal length section 4K is met. Meanwhile, the lens is an optical zoom system which is small in size, large in aperture, and suitable for low-illumination scenes and high in magnification. Fig. 10 to 12 reflect the performance of the zoom lens according to the present embodiment.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A zoom lens, comprising: a first fixed lens group (G1) having positive optical power, a first zoom lens group (G2) having negative optical power, an aperture Stop (STO), a second fixed lens group (G3) having positive optical power, a second zoom lens group (G4) having positive optical power, and a focus lens group (G5) arranged in this order from the object side to the image side along the optical axis,
the focal lens group (G5) has a positive optical power;
the first zoom lens group (G2), the second zoom lens group (G4), and the focus lens group (G5) are all movable in an optical axis direction.
2. The zoom lens according to claim 1,
a focal length (FG1) of the first fixed lens group (G1) satisfies: FG1/FW is more than or equal to 8 and less than or equal to 11.6;
a focal length (FG2) of the first zoom lens group (G2) satisfies: FG2/FW is not less than-2.5 and not more than-1.7;
a focal length (FG4) of the second zoom lens group (G4) satisfies: FG4/FW is more than or equal to 2.8 and less than or equal to 4.5;
where FW is the focal length at the wide-angle end of the zoom lens.
3. The zoom lens according to claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the first fixed lens group (G1) includes, in order, a first lens (L1) having negative optical power, a second lens (L2) having positive optical power, a third lens (L3) having positive optical power, and a fourth lens (L4) having positive optical power.
4. The zoom lens according to claim 3,
the object side surface of the first lens (L1) is convex, and the image side surface of the first lens is concave;
the second lens (L2), the third lens (L3), and the fourth lens (L4) are convex on the object side.
5. The zoom lens according to claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the first zoom lens group (G2) includes, in order, a fifth lens (L5) having negative optical power, a sixth lens (L6) having positive optical power, a seventh lens (L7) having negative optical power, an eighth lens (L8) having positive optical power, and a ninth lens (L9) having negative optical power.
6. The zoom lens according to claim 5,
the image side surface of the fifth lens (L5) is concave;
the object side surface of the sixth lens (L6) is concave, and the image side surface of the sixth lens is convex;
the object side surface and the image side surface of the seventh lens (L7) are both concave.
7. The zoom lens according to claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the second fixed lens group (G3) includes, in order, a tenth lens (L10) having positive optical power and an eleventh lens (L11) having negative optical power.
8. The zoom lens according to claim 7, wherein both the object-side surface and the image-side surface of the tenth lens (L10) are convex.
9. The zoom lens according to claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the second zoom lens group (G4) includes, in order, a twelfth lens (L12) having positive optical power, a thirteenth lens (L13) having positive optical power, a fourteenth lens (L14) having negative optical power, a fifteenth lens (L15) having positive optical power, a sixteenth lens (L16) having positive or negative optical power, and a seventeenth lens (L17).
10. The zoom lens according to claim 9,
the object side surface and the image side surface of the twelfth lens (L12) are both convex;
the object sides of the thirteenth lens (L13) and the fifteenth lens (L15) are both convex;
the image side surface of the fourteenth lens (L14) is concave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111191896.2A CN113805323A (en) | 2021-10-13 | 2021-10-13 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111191896.2A CN113805323A (en) | 2021-10-13 | 2021-10-13 | Zoom lens |
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| CN113805323A true CN113805323A (en) | 2021-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111191896.2A Pending CN113805323A (en) | 2021-10-13 | 2021-10-13 | Zoom lens |
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