CN216351506U - Zoom lens - Google Patents
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- CN216351506U CN216351506U CN202123185250.1U CN202123185250U CN216351506U CN 216351506 U CN216351506 U CN 216351506U CN 202123185250 U CN202123185250 U CN 202123185250U CN 216351506 U CN216351506 U CN 216351506U
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Abstract
The present invention relates to a zoom lens, which comprises the following components in sequence from an object side to an image side along an optical axis: the zoom lens system comprises a first fixed lens group (G1) with positive focal power, a first variable power lens group (G2) with negative focal power, a diaphragm (STO), a second fixed lens group (G3) with positive focal power, a second variable power lens group (G4) with positive focal power, a third fixed lens group (G5) with negative focal power and a focusing lens group (G6) with positive focal power. The zoom lens of the utility model can give consideration to large variable magnification, high resolution and low distortion, has wide range of focusing object distance, and the variation range of the magnification of the zoom lens from a wide angle end to a telephoto end can reach more than 20X, and simultaneously, the absolute value of distortion in the whole zooming process is less than 5 percent.
Description
Technical Field
The utility model relates to the technical field of imaging lenses, in particular to a zoom lens.
Background
In recent years, with the development of chip technologies such as CCD or CMOS, and the improvement of image quality requirements of people for video conferences, the imaging quality requirements for the associated optical systems are also increasing. In order to meet this trend, optical lenses mounted on video conference products are also required to have performance such as high resolution, large magnification ratio, and low distortion.
The existing large-magnification zoom lens in the market still has some performance defects to limit the use scene. If the resolving power is insufficient, the resolution is low; the wide-angle is not large enough, and the shooting range is limited; the magnification of the long focal end is not large enough, and the amplification effect is not enough; large distortion, serious deformation of an imaging picture and the like; the range of the focusing object distance is not wide enough, and the use scene is limited.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model provides the zoom lens, which has the advantages of large variable magnification, high resolution, low distortion and wide focusing object distance range, and the variable magnification range of the zoom lens from the wide angle end to the telephoto end can reach more than 20X, and the absolute distortion value in the whole zooming process is less than 5 percent.
To achieve the above object, the present invention provides a zoom lens, comprising, in order from an object side to an image side along an optical axis: the zoom lens comprises a first fixed lens group with positive focal power, a first variable power lens group with negative focal power, a diaphragm, a second fixed lens group with positive focal power, a second variable power lens group with positive focal power, a third fixed lens group with negative focal power and a focusing lens group with positive focal power.
According to one aspect of the present invention, the first fixed lens group includes at least four lenses having positive optical power and one lens having negative optical power.
According to one aspect of the present invention, the first fixed lens group comprises at least three lenses with a convex object-side surface, a concave image-side surface and a positive focal power, and one lens with a convex object-side surface, a concave image-side surface and a negative focal power.
According to one aspect of the present invention, the first variable power lens group comprises at least one lens with positive focal power and two lenses with negative focal power.
According to one aspect of the present invention, the first variable power lens group comprises at least one lens with a convex object-side surface, a concave image-side surface and a negative focal power.
According to an aspect of the present invention, the second fixed lens group comprises at least one lens with positive focal power and one lens with negative focal power.
According to an aspect of the present invention, the second fixed lens group comprises at least one lens with a concave object-side surface, a convex image-side surface and a negative focal power.
According to one aspect of the utility model, the second variable power lens group comprises at least three lenses with positive focal power and two lenses with negative focal power.
According to one aspect of the utility model, the second zoom lens group comprises at least two convex-convex lenses with positive focal power and one lens with concave object-side surface, convex image-side surface and negative focal power.
According to an aspect of the present invention, the second variable power lens group comprises at least one double cemented lens.
According to an aspect of the present invention, a focal length FA of the double cemented lens and a focal length F4 of the second variable power lens group satisfy the relation: FA/F4 is more than or equal to 2.14 and less than or equal to 7.20.
According to an aspect of the present invention, the third fixed lens group comprises at least one lens with negative optical power.
According to one aspect of the present invention, the focusing lens group comprises a lens with positive focal power and a lens with negative focal power.
According to one aspect of the present invention, the zoom lens includes at least four cemented lenses.
According to one aspect of the present invention, the zoom lens includes at least one aspheric lens.
According to one aspect of the utility model, the material of the aspheric lens is glass or plastic.
According to an aspect of the present invention, the refractive index Nd and the abbe number Vd of the aspheric lens satisfy the following relations: nd is more than or equal to 1.50 and less than or equal to 1.90; vd is more than or equal to 20.0 and less than or equal to 65.0.
According to an aspect of the present invention, the focal length F1 of the first fixed lens group satisfies the relational expressions with the wide-angle end focal length Fw of the zoom lens and the telephoto end focal length Ft of the zoom lens, respectively: F1/Fw is more than or equal to 17.10 and less than or equal to 18.44; F1/Ft is more than or equal to 0.93 and less than or equal to 1.01.
According to an aspect of the present invention, a focal length F2 of the first variable power lens group satisfies the relational expressions with a wide-angle end focal length Fw of the zoom lens and a telephoto end focal length Ft of the zoom lens, respectively: F2/Fw is more than or equal to-2.29 and less than or equal to-2.11; F2/Ft is more than or equal to-0.13 and less than or equal to-0.11.
According to an aspect of the present invention, the focal length F3 of the second fixed lens group satisfies the relational expressions with the wide-angle end focal length Fw of the zoom lens and the telephoto end focal length Ft of the zoom lens, respectively: F3/Fw is more than or equal to 13.47 and less than or equal to 18.43; F3/Ft is more than or equal to 0.72 and less than or equal to 1.01.
According to an aspect of the present invention, a focal length F4 of the second variable power lens group satisfies the relational expressions with a wide-angle end focal length Fw of the zoom lens and a telephoto end focal length Ft of the zoom lens, respectively: F4/Fw is more than or equal to 4.35 and less than or equal to 5.16; F4/Ft is more than or equal to 0.23 and less than or equal to 0.28.
According to an aspect of the present invention, a focal length F5 of the third fixed lens group satisfies the relational expressions with a wide-angle end focal length Fw of the zoom lens, and a telephoto end focal length Ft of the zoom lens, respectively: F5/Fw is more than or equal to-10.51 and less than or equal to-2.79; F5/Ft is more than or equal to-0.57 and less than or equal to-0.15.
According to an aspect of the present invention, the focal length F6 of the focusing lens group and the wide-angle end focal length Fw of the zoom lens and the telephoto end focal length Ft of the zoom lens respectively satisfy the following relations: F6/Fw is more than or equal to 3.07 and less than or equal to 6.38; F6/Ft is more than or equal to 0.16 and less than or equal to 0.35.
According to an aspect of the present invention, a wide-angle end focal length Fw of the zoom lens, a telephoto end focal length Ft of the zoom lens, and a total optical length TTL of the zoom lens satisfy the following relations: Fw/TTL is more than or equal to 0.02 and less than or equal to 0.03; Ft/TTL is more than or equal to 0.52 and less than or equal to 0.54.
According to the scheme of the utility model, the positive and negative focal powers of six groups in the zoom lens with the optical structure of three-fixed, two-variable-power and one-focusing and the shapes of all lenses in the groups are reasonably distributed and combined, so that the zoom lens has a wide focusing object distance range, can ensure that the lens can be clearly focused from the object distance of 0.1m to infinity in the whole zooming process, has an imaging resolution of more than 4K, has a wide visual field range of more than 88 degrees at the wide-angle end. Meanwhile, the zoom magnification is high, namely the magnification variation range of the lens can reach more than 20X from the wide angle end to the telephoto end. The distortion absolute value of the zoom lens in the whole zooming process is less than 5%, and the deformation of a shot picture is ensured to be small.
Drawings
Fig. 1 schematically shows an optical system diagram of a zoom lens according to embodiment 1 of the present invention;
FIG. 2 is a schematic view showing an optical system of a zoom lens according to embodiment 2 of the present invention;
FIG. 3 is a schematic view showing an optical system of a zoom lens system according to embodiment 3 of the present invention;
fig. 4 schematically shows an optical system diagram of a zoom lens system according to embodiment 4 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 utility model, 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, the zoom lens of the present invention includes, in order from an object side to an image side along an optical axis: a first fixed lens group G1 with positive power, a first variable power lens group G2 with negative power, a stop STO, a second fixed lens group G3 with positive power, a second variable power lens group G4 with positive power, a third fixed lens group G5 with negative power, and a focusing lens group G6 with positive power. The zoom lens has wide range of focusing object distance, can ensure that the object distance can be clearly focused from 0.1m to infinity in the whole zooming process, and has good imaging effect. Meanwhile, the zoom magnification is high, namely the magnification variation range of the lens can reach more than 20X from the wide angle end to the telephoto end.
In the present invention, the first fixed lens group G1 includes at least four lenses with positive refractive power and one lens with negative refractive power for the first fixed lens group G1. The first fixed lens group G1 comprises at least three lenses with convex object-side surface, concave image-side surface and positive focal power, and one lens with convex object-side surface, concave image-side surface and negative focal power.
For the first variable power lens group G2, the first variable power lens group G2 includes at least one lens with positive power and two lenses with negative power. The first zoom lens group G2 comprises at least one lens with a convex object-side surface, a concave image-side surface and a negative focal power.
For the second fixed lens group G3, the second fixed lens group G3 includes at least one lens with positive focal power and one lens with negative focal power. The second fixed lens group G3 includes at least one lens with a concave object-side surface, a convex image-side surface and a negative focal power.
For the second variable power lens group G4, the second variable power lens group G4 includes at least three lenses with positive focal power and two lenses with negative focal power. The second zoom lens group G4 at least includes two convex-convex lenses with positive focal power and one lens with concave object-side surface, convex image-side surface and negative focal power.
For the third fixed lens group G5, the third fixed lens group G5 includes at least one lens with negative power. For the focusing lens group G6, the focusing lens group G6 at least includes a lens with positive focal power and a lens with negative focal power.
By reasonably distributing the positive and negative focal powers and the lens shapes of all the lenses to the zooming optical system, and reasonably distributing the positive and negative focal powers of the six groups of 'three fixed, two variable power and one focusing', the imaging resolution of the zoom lens is more than 4K, the wide-angle end view range is wide and can reach more than 88 degrees.
The zoom lens at least comprises four cemented lenses. The second zoom lens group G4 at least includes a double cemented lens. At this time, the focal length FA of the double cemented lens and the focal length F4 of the second variable power lens group G4 satisfy the relation: FA/F4 is more than or equal to 2.14 and less than or equal to 7.20. By reasonably setting the cemented lens and the focal length thereof, the absolute value of distortion of the zoom lens in the whole zooming process is less than 5%, and the deformation of a shot picture is ensured to be small. Meanwhile, the single part of the lens and the assembly tolerance are better, and the lens has good manufacturability.
In the present invention, the zoom lens includes at least one aspheric lens. The aspheric lens is made of glass or plastic. The refractive index Nd and the Abbe number Vd of the aspheric lens respectively satisfy the relational expression: nd is more than or equal to 1.50 and less than or equal to 1.90; vd is more than or equal to 20.0 and less than or equal to 65.0. By adopting the glass aspheric lens, the presenting quality of the optical system of the zoom lens can be greatly improved. By adopting the plastic aspheric lens, the design cost can be reduced while the larger magnification is ensured, and the imaging quality of the optical system is considered at the same time.
In the present invention, the focal length F1 of the first fixed lens group G1 satisfies the relational expressions with the wide-angle end focal length Fw of the zoom lens and the telephoto end focal length Ft of the zoom lens, respectively: F1/Fw is more than or equal to 17.10 and less than or equal to 18.44; F1/Ft is more than or equal to 0.93 and less than or equal to 1.01.
The focal length F2 of the first variable power lens group G2 satisfies the relation with the wide-angle end focal length Fw of the zoom lens and the telephoto end focal length Ft of the zoom lens respectively: F2/Fw is more than or equal to-2.29 and less than or equal to-2.11; F2/Ft is more than or equal to-0.13 and less than or equal to-0.11.
The focal length F3 of the second fixed lens group G3 respectively satisfies the relation with the wide-angle end focal length Fw of the zoom lens and the telephoto end focal length Ft of the zoom lens: F3/Fw is more than or equal to 13.47 and less than or equal to 18.43; F3/Ft is more than or equal to 0.72 and less than or equal to 1.01.
The focal length F4 of the second variable power lens group G4 satisfies the relation with the wide-angle end focal length Fw of the zoom lens and the telephoto end focal length Ft of the zoom lens respectively: F4/Fw is more than or equal to 4.35 and less than or equal to 5.16; F4/Ft is more than or equal to 0.23 and less than or equal to 0.28.
The focal length F5 of the third fixed lens group G5 respectively satisfies the relation with the wide-angle end focal length Fw of the zoom lens and the telephoto end focal length Ft of the zoom lens: F5/Fw is more than or equal to-10.51 and less than or equal to-2.79; F5/Ft is more than or equal to-0.57 and less than or equal to-0.15.
The focal length F6 of the focusing lens group G6 respectively satisfies the following relation with the wide-angle end focal length Fw of the zoom lens and the telephoto end focal length Ft of the zoom lens: F6/Fw is more than or equal to 3.07 and less than or equal to 6.38; F6/Ft is more than or equal to 0.16 and less than or equal to 0.35.
The focal lengths of the six lens groups of the three fixed lens groups, the two variable-power lens groups and the focusing lens group are in a certain proportional relation with the focal length Fw of the wide-angle end and the focal length Ft of the telephoto end of the zoom lens, so that the zoom lens can achieve a wide focusing object distance range, can ensure that the object distance can be clearly focused from 0.1m to infinity in the whole zooming process, and has a good imaging effect. Meanwhile, high variable magnification is realized, and the magnification variation range can reach more than 20X from the wide angle end to the telephoto end.
In the present invention, a wide-angle end focal length Fw of the zoom lens, a telephoto end focal length Ft of the zoom lens, and a total optical length TTL of the zoom lens satisfy the following relations: Fw/TTL is more than or equal to 0.02 and less than or equal to 0.03; Ft/TTL is more than or equal to 0.52 and less than or equal to 0.54. The zoom lens has high variable magnification, the magnification change range can reach more than 20X from the wide angle end to the telephoto end, and the miniaturization of the lens is realized.
The zoom lens is specifically described below in three specific embodiments. In each of the following embodiments, the parallel plate CG has two sides, the image side surface is designated IMA, the stop STO is designated one side, and the cemented surface of the cemented lens is designated one side, for example, 3 sides in total for a double cemented lens consisting of 2 cemented lenses.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
table 1 in the present invention, an 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.
Example 1
In this embodiment, the second lens group G2 includes one lens with positive refractive power and three lenses with negative refractive power, and the sixth lens group G6 includes two lenses with positive refractive power and one lens with negative refractive power. The zoom lens also comprises a glass aspheric lens. The parameters of the zoom lens of the present embodiment are as follows:
TTL＝120.01mm；
FNO(WIDE)＝1.87；
wide-angle end focal length fw is 3.463 mm;
the tele end focal length ft is 63.174 mm.
The parameters of each lens of the zoom lens of the present embodiment include: the surface type, radius of curvature (R value), thickness d, refractive index Nd of the material, abbe number Vd, are shown in table 2 below:
TABLE 2
The aspheric coefficients of the aspheric lenses of the zoom lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12Fourteen-order aspheric surface coefficient A14And a sixteen-order aspheric coefficient A16As shown in table 3 below.
| Number of noodles | Value of K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 12 | 0.00E+00 | -4.99E-05 | -4.82E-08 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 13 | 0.00E+00 | -1.18E-04 | -9.17E-08 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
Table 3 the wide-angle end and telephoto end magnification variation data of the zoom lens of the present embodiment are as shown in table 4 below.
| Wide angle end | Telescope end | |
| T1 | 0.7 | 35.17 |
| T2 | 35.97 | 1.5 |
| T3 | 12.47 | 1.1 |
| T4 | 1.02 | 12.39 |
| T5 | 3.58 | 6.543 |
| T6 | 4.24 | 1.277 |
TABLE 4
Referring to fig. 1, in combination with tables 1 to 4, in this embodiment, the positive and negative powers of six groups and the shapes of the lenses in the groups in the zoom lens having the "three-fixed, two-variable magnification and one-focusing" optical structure are reasonably distributed and combined, so that the zoom lens can focus over a wide range of object distances, can ensure that the lenses can be clearly focused from an object distance of 0.1m to infinity in the entire zooming process, has an imaging resolution of more than 4K, and has a wide visual field range at a wide angle end of more than 88 degrees. Meanwhile, the zoom magnification is high, namely the magnification variation range of the lens can reach more than 20X from the wide angle end to the telephoto end. The distortion absolute value of the zoom lens in the whole zooming process is less than 5%, and the deformation of a shot picture is ensured to be small. In addition, the glass aspheric lens is adopted, so that the presenting quality of the optical system of the zoom lens can be greatly improved.
Example 2
In this embodiment, the second lens group G2 includes one lens with positive refractive power and three lenses with negative refractive power, and the sixth lens group G6 includes two lenses with positive refractive power and one lens with negative refractive power. The zoom lens also comprises a glass aspheric lens. The parameters of the zoom lens of the present embodiment are as follows:
TTL＝120.01mm；
FNO(WIDE)＝1.88；
wide-angle end focal length fw is 3.464 mm;
the tele end focal length ft is 63.704 mm.
The parameters of each lens of the zoom lens of the present embodiment include: the surface type, radius of curvature (R value), thickness d, refractive index Nd of the material, abbe number Vd, are shown in table 5 below:
TABLE 5
The aspheric coefficients of the aspheric lenses of the zoom lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12Fourteen-order aspheric surface coefficient A14And a sixteen-order aspheric coefficient A16As shown in table 6 below.
Table 6 the wide-angle end and telephoto end magnification variation data of the zoom lens of the present embodiment are as shown in table 7 below.
| Wide angle end | Telescope end | |
| T1 | 0.7 | 34.67 |
| T2 | 35.37 | 1.4 |
| T3 | 13.9 | 1.1 |
| T4 | 0.8 | 13.6 |
| T5 | 3.763 | 6.815 |
| T6 | 4.357 | 1.305 |
TABLE 7
Referring to fig. 2, in combination with tables 1 and 5 to 7, in this embodiment, the positive and negative powers of six groups and the shapes of the lenses in the groups in the zoom lens having the "three-fixed, two-variable magnification and one-focusing" optical structure are reasonably distributed and combined, so that the zoom lens can focus on a wide range of object distances, can ensure that the lenses can be clearly focused from an object distance of 0.1m to infinity in the entire zooming process, has an imaging resolution of 4K or more, and has a wide visual field range at the wide-angle end of 88 degrees or more. Meanwhile, the zoom magnification is high, namely the magnification variation range of the lens can reach more than 20X from the wide angle end to the telephoto end. The distortion absolute value of the zoom lens in the whole zooming process is less than 5%, and the deformation of a shot picture is ensured to be small. In addition, the glass aspheric lens is adopted, so that the presenting quality of the optical system of the zoom lens can be greatly improved.
Example 3
In this embodiment, the second lens group G2 includes two lenses with positive refractive power and two lenses with negative refractive power, and the sixth lens group G6 includes two lenses with positive refractive power and one lens with negative refractive power. The zoom lens also comprises a plastic aspheric lens. The parameters of the zoom lens of the present embodiment are as follows:
TTL＝120.02mm；
FNO(WIDE)＝1.88；
wide-angle end focal length fw is 3.470 mm;
the tele end focal length ft is 64.344 mm.
The parameters of each lens of the zoom lens of the present embodiment include: the surface type, radius of curvature (R value), thickness d, refractive index Nd of the material, abbe number Vd, are shown in table 8 below:
TABLE 8
The aspheric coefficients of the aspheric lenses of the zoom lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12Fourteen-order aspheric surface coefficient A14And a sixteen-order aspheric coefficient A16As shown in table 9 below.
Table 9 the wide-angle end and telephoto end magnification variation data of the zoom lens of the present embodiment are as shown in table 10 below.
| Wide angle end | Telescope end | |
| T1 | 0.7 | 36.27 |
| T2 | 37 | 1.44 |
| T3 | 14.05 | 1.1 |
| T4 | 0.8 | 13.75 |
| T5 | 3.872 | 6.477 |
| T6 | 3.898 | 1.283 |
Watch 10
Referring to fig. 3, with reference to tables 1 and 8 to 10, in this embodiment, the positive and negative powers of six groups and the shapes of the lenses in the groups in the zoom lens having the "three-fixed, two-variable magnification and one-focusing" optical structure are reasonably distributed and combined, so that the zoom lens has a wide range of focusable object distances, can ensure that the lenses can be clearly focused from an object distance of 0.1m to infinity in the entire zooming process, has an imaging resolution of 4K or more, and has a wide visual field range at the wide-angle end of 88 degrees or more. Meanwhile, the zoom magnification is high, namely the magnification variation range of the lens can reach more than 20X from the wide angle end to the telephoto end. The distortion absolute value of the zoom lens in the whole zooming process is less than 5%, and the deformation of a shot picture is ensured to be small. In addition, the plastic aspheric lens is adopted, so that the design cost is reduced while the zoom lens has larger magnification, and the imaging quality of the optical system of the zoom lens is considered.
Example 4
In this embodiment, the second lens group G2 includes one lens with positive refractive power and three lenses with negative refractive power, and the sixth lens group G6 includes one lens with positive refractive power and two lenses with negative refractive power. The zoom lens also comprises a glass aspheric lens and three plastic aspheric lenses. The parameters of the zoom lens of the present embodiment are as follows:
TTL＝120.018mm；
FNO(WIDE)＝1.87；
wide-angle end focal length fw is 3.464 mm;
the tele end focal length ft is 63.387 mm.
The parameters of each lens of the zoom lens of the present embodiment include: the surface type, radius of curvature (R value), thickness d, refractive index Nd of the material, abbe number Vd are shown in table 11 below:
table 11 aspherical surface coefficients of the aspherical lenses of the zoom lens of this embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12Fourteen-order aspheric surface coefficient A14And a sixteen-order aspheric coefficient A16As shown in table 12 below.
Table 12 wide-angle end and telephoto end magnification variation data of the zoom lens of the present embodiment are as shown in table 13 below.
| Wide angle end | Telescope end | |
| T1 | 0.7 | 34.75 |
| T2 | 35.52 | 1.46 |
| T3 | 16.04 | 1.1 |
| T4 | 0.8 | 15.74 |
| T5 | 2.854 | 4.98 |
| T6 | 2.476 | 1.36 |
Referring to fig. 4, in combination with table 1 and tables 11 to 13, in this embodiment, the positive and negative powers of the six groups and the shapes of the lenses in the groups in the zoom lens having the "three-fixed, two-variable magnification and one-focus" optical structure are reasonably distributed and combined, so that the zoom lens can focus on a wide range of object distances, can ensure that the lenses can be clearly focused from an object distance of 0.1m to infinity in the entire zooming process, has an imaging resolution of 4K or more, and has a wide visual field range at the wide-angle end of 88 degrees or more. Meanwhile, the zoom magnification is high, namely the magnification variation range of the lens can reach more than 20X from the wide angle end to the telephoto end. The distortion absolute value of the zoom lens in the whole zooming process is less than 5%, and the deformation of a shot picture is ensured to be small. In addition, the comprehensive use of the glass aspheric lens and the plastic aspheric lens can ensure that the zoom lens has larger magnification, reduce the design cost and greatly improve the imaging quality of the optical system of the zoom lens.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. 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 (24)
1. A zoom lens includes, in order from an object side to an image side along an optical axis: a first fixed lens group (G1) with positive focal power, a first variable power lens group (G2) with negative focal power, a Stop (STO), a second fixed lens group (G3) with positive focal power, a second variable power lens group (G4) with positive focal power, characterized by further comprising: a third fixed lens group (G5) having negative optical power, and a focusing lens group (G6) having positive optical power.
2. A zoom lens according to claim 1, wherein the first fixed lens group (G1) includes at least four lenses having positive optical power and one lens having negative optical power.
3. The zoom lens according to claim 2, wherein the first fixed lens group (G1) comprises at least three lenses with convex object-side surface, concave image-side surface and positive optical power, and one lens with convex object-side surface, concave image-side surface and negative optical power.
4. The zoom lens according to claim 1, wherein the first variable power lens group (G2) includes at least one lens having positive optical power and two lenses having negative optical power.
5. The zoom lens according to claim 4, wherein the first variable power lens group (G2) comprises at least one lens with a convex object-side surface, a concave image-side surface and a negative optical power.
6. A zoom lens according to claim 1, wherein the second fixed lens group (G3) comprises at least one lens with positive optical power and one lens with negative optical power.
7. The zoom lens according to claim 6, wherein the second fixed lens group (G3) comprises at least one lens with a concave object-side surface, a convex image-side surface and a negative optical power.
8. The zoom lens according to claim 1, wherein the second variable power lens group (G4) includes at least three lenses having positive optical power and two lenses having negative optical power.
9. The zoom lens according to claim 8, wherein the second variable power lens group (G4) comprises at least two convex-convex lenses with positive optical power and one lens with concave object-side surface, convex image-side surface and negative optical power.
10. The zoom lens according to claim 8, wherein the second variable power lens group (G4) comprises at least one cemented doublet.
11. A zoom lens according to claim 10, wherein a focal length FA of the cemented doublet and a focal length F4 of the second variable power lens group (G4) satisfy the relation: FA/F4 is more than or equal to 2.14 and less than or equal to 7.20.
12. A zoom lens according to claim 1, wherein the third fixed lens group (G5) comprises at least one lens having a negative optical power.
13. The zoom lens according to claim 1, wherein the focusing lens group (G6) comprises at least one lens with positive optical power and one lens with negative optical power.
14. The zoom lens according to any one of claims 1 to 13, wherein the zoom lens comprises at least four cemented lenses.
15. The zoom lens according to any one of claims 1 to 13, wherein the zoom lens comprises at least one aspherical lens.
16. The zoom lens according to claim 15, wherein the aspheric lens is made of glass or plastic.
17. The zoom lens according to claim 16, wherein the refractive index Nd and the abbe number Vd of the aspherical lens satisfy the relationship: nd is more than or equal to 1.50 and less than or equal to 1.90; vd is more than or equal to 20.0 and less than or equal to 65.0.
18. A zoom lens according to any one of claims 1 to 13, wherein the focal length F1 of the first fixed lens group (G1) satisfies the relationships, respectively, with a wide-angle end focal length Fw of the zoom lens, and a telephoto end focal length Ft of the zoom lens: F1/Fw is more than or equal to 17.10 and less than or equal to 18.44; F1/Ft is more than or equal to 0.93 and less than or equal to 1.01.
19. A zoom lens according to any one of claims 1 to 13, wherein the focal length F2 of the first variable power lens group (G2) satisfies the relationships, respectively, with the wide-angle end focal length Fw of the zoom lens, and the telephoto end focal length Ft of the zoom lens: F2/Fw is more than or equal to-2.29 and less than or equal to-2.11; F2/Ft is more than or equal to-0.13 and less than or equal to-0.11.
20. A zoom lens according to any one of claims 1 to 13, wherein the focal length F3 of the second fixed lens group (G3) satisfies the relationships, respectively, with a wide-angle end focal length Fw of the zoom lens, and a telephoto end focal length Ft of the zoom lens: F3/Fw is more than or equal to 13.47 and less than or equal to 18.43; F3/Ft is more than or equal to 0.72 and less than or equal to 1.01.
21. A zoom lens according to any one of claims 1 to 13, wherein the focal length F4 of the second variable power lens group (G4) satisfies the relationships, respectively, with the wide-angle end focal length Fw of the zoom lens, and the telephoto end focal length Ft of the zoom lens: F4/Fw is more than or equal to 4.35 and less than or equal to 5.16; F4/Ft is more than or equal to 0.23 and less than or equal to 0.28.
22. A zoom lens according to any one of claims 1 to 13, wherein the focal length F5 of the third fixed lens group (G5) satisfies the relationships, respectively, with the wide-angle end focal length Fw of the zoom lens, and the telephoto end focal length Ft of the zoom lens: F5/Fw is more than or equal to-10.51 and less than or equal to-2.79; F5/Ft is more than or equal to-0.57 and less than or equal to-0.15.
23. A zoom lens according to any one of claims 1 to 13, wherein the focal length F6 of the focusing lens group (G6) satisfies the relationships, respectively, with the wide-angle end focal length Fw of the zoom lens, and the telephoto end focal length Ft of the zoom lens: F6/Fw is more than or equal to 3.07 and less than or equal to 6.38; F6/Ft is more than or equal to 0.16 and less than or equal to 0.35.
24. The zoom lens according to any one of claims 1 to 13, wherein the wide-angle end focal length Fw of the zoom lens, the telephoto end focal length Ft of the zoom lens, and the total optical length TTL of the zoom lens satisfy the relationships: Fw/TTL is more than or equal to 0.02 and less than or equal to 0.03; Ft/TTL is more than or equal to 0.52 and less than or equal to 0.54.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123185250.1U CN216351506U (en) | 2021-12-17 | 2021-12-17 | Zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123185250.1U CN216351506U (en) | 2021-12-17 | 2021-12-17 | Zoom lens |
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| CN216351506U true CN216351506U (en) | 2022-04-19 |
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| CN (1) | CN216351506U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089523A (en) * | 2021-12-17 | 2022-02-25 | 舜宇光学(中山)有限公司 | Zoom lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089523A (en) * | 2021-12-17 | 2022-02-25 | 舜宇光学(中山)有限公司 | Zoom lens |
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