CN214846007U - Zoom lens - Google Patents
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- CN214846007U CN214846007U CN202120599424.XU CN202120599424U CN214846007U CN 214846007 U CN214846007 U CN 214846007U CN 202120599424 U CN202120599424 U CN 202120599424U CN 214846007 U CN214846007 U CN 214846007U
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Abstract
The utility model relates to a zoom lens, along thing side to image side direction, include compensation group (1) of negative focal power, fixed group (2) of positive focal power and zoom group (3) of positive focal power in proper order, compensation group (1) includes three pieces of lens, fixed group (2) includes one piece of lens, zoom group (3) includes six pieces of lens. The utility model discloses a zoom lens passes through the setting of each group lens quantity, the reasonable collocation of focal power, coefficient of dispersion and sphere, aspheric surface between each lens, when guaranteeing super large light ring zoom optical system, high-resolution, infrared confocal, high low temperature performance, can also reduce camera lens volume, weight, promotes the assemblability of camera lens, has greatly reduced manufacturing cost.
Description
Technical Field
The utility model relates to the field of optical technology, especially, relate to a zoom lens.
Background
In order to adapt to the diversity of monitoring places, clear imaging of the far end and the near end of a day and night mode needs to be obtained in the shooting process, and therefore the monitoring lens is required to have a sufficient zooming effect. The zoom monitoring lens is accompanied by an increase in the number of lenses and a complicated lens structure while satisfying the quality of near-distance and long-distance imaging. In addition, in the field of security protection, a camera lens is generally required to have infrared confocal performance and the characteristic of image non-rectification at high and low temperatures, but in general, it is difficult to achieve high resolution, infrared confocal performance, non-rectification at high and low temperature environments, and low cost in a zoom optical system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve above-mentioned problem, provide a zoom.
In order to realize the objective of the present invention, the present invention provides a zoom lens, which comprises a compensation group of negative focal power, a fixed group of positive focal power and a zoom group of positive focal power in sequence along the direction from the object side to the image side, wherein the compensation group comprises three lenses, the fixed group comprises one lens, and the zoom group comprises six lenses.
According to an aspect of the present invention, along the direction from the object side to the image side, the focal powers of the six lenses in the zoom group are positive, negative, positive, and positive in order.
According to an aspect of the present invention, the third lens and the fourth lens in the zoom lens group form a double cemented lens group along the direction from the object side to the image side.
According to an aspect of the present invention, along the direction from the object side to the image side, six lenses in the zoom group are sequentially an aspheric lens, an aspheric spherical lens, a spherical lens, an aspheric lens, and an aspheric lens.
According to an aspect of the utility model, along thing side to image side direction, six pieces of lens are biconvex type lens, convex concave type lens, biconvex type lens, biconcave type lens, biconvex type lens, the convex concave type lens of paraxial region in proper order in the group of becoming multiple.
According to an aspect of the utility model, the focus of fixed group is FII, the focus of variable power group is FIII, along thing side to image side direction, the focus of the first piece of lens in the variable power group is f5, satisfies the relational expression: FII/f5 is more than or equal to 4.5 and less than or equal to 13.5; f5/FIII is more than or equal to 0.5 and less than or equal to 1.5.
According to an aspect of the present invention, in a direction from the object side to the image side, a relationship is satisfied between the focal length f6 of the second lens and the focal length f9 of the fifth lens in the variable power group: f6/f9 is more than or equal to-2.0 and less than or equal to-0.5.
According to an aspect of the present invention, in a direction from the object side to the image side, abbe numbers of the first lens, the third lens and the fourth lens in the variable power group are Vd5, Vd7 and Vd8, respectively, and satisfy the following relations: 1.2 is not less than Vd5/Vd8 is not less than 4.0; 1.2 is less than or equal to Vd7/Vd8 is less than or equal to 3.0.
According to an aspect of the present invention, the compensation group includes a negative power lens, and a positive power lens, which are disposed in order from the object side to the image side.
According to an aspect of the present invention, the compensation group sequentially includes a spherical lens, an aspheric lens, and a spherical lens or an aspheric lens along the direction from the object side to the image side.
According to an aspect of the present invention, the compensation group includes a concave-convex lens, and a concave-convex lens in sequence from the object side to the image side.
According to an aspect of the present invention, along the object-side to image-side direction, the relationship between the radius of curvature R2a of the object-side surface of the second lens and the radius of curvature R1b of the image-side surface of the first lens in the compensation group is satisfied: r2a/R1a is not less than-22.0 and not more than-4.0.
According to an aspect of the invention, the lenses in the fixed group are spherical lenses or aspherical lenses.
According to an aspect of the present invention, the lenses in the fixed group are paraxial region convex-concave type lenses.
According to an aspect of the invention, the lenses in the fixed group are positive power lenses.
According to an aspect of the present invention, the zoom lens includes at least five aspheric lenses.
According to an aspect of the present invention, the zoom lens further includes a diaphragm, the diaphragm is located between the compensation group and the fixed group, or between the fixed group and the zoom group.
According to the utility model discloses an aspect, the focus of compensation group is FI, the focus of fixed group is FII, the focus of zoom group is FIII, satisfies the relational expression: the absolute FII/FI is more than or equal to 6.0 and less than or equal to 17.5; the absolute value FII/FIII is more than or equal to 4.2 and less than or equal to 14.5.
According to the utility model discloses an aspect, the fixed focus FII of group with satisfy the relational expression between zoom wide-angle end focus fw, the telephoto end focus ft: FII/fw is more than or equal to 15.5 and less than or equal to 46.0; FII/ft is more than or equal to 5.0 and less than or equal to 15.5.
According to an aspect of the present invention, the zoom lens is wide-angle end optical total length Lw with satisfy the relational expression between the compensation group and the variable power group move to the interval variation Lg between the telephoto end from the wide-angle end: Lg/Lw is more than or equal to 0.3 and less than or equal to 0.4.
The utility model discloses a zoom lens passes through the setting of each group lens quantity, the reasonable collocation of focal power, coefficient of dispersion and sphere, aspheric surface between each lens, when guaranteeing super large light ring zoom optical system, high-resolution, infrared confocal, high low temperature performance, can also reduce camera lens volume, weight, promotes the assemblability of camera lens, has greatly reduced manufacturing cost.
The utility model discloses a zoom is equipped with five pieces of aspherical lens at least. Satisfying this and setting is favorable to correcting the lens aberration, improves the lens resolving power to be favorable to realizing big light ring, thereby promoted the market competition of camera lens. The first lens in the zoom group is an aspheric lens, so that spherical aberration can be reduced, the total length of the lens is ensured to be small, meanwhile, the super-large aperture zoom optical system is realized, and if the lens in the fixed group adopts the aspheric lens, the first lens in the zoom group can be matched with the aspheric lens to realize imaging with higher resolution. If the last lens close to the image side in the zoom group adopts an aspheric lens, residual aberrations such as curvature of field, astigmatism and the like can be further corrected.
The utility model discloses a zoom, the focus of compensation group 1 is FI, and the focus of fixed group is FII, and the focus of zoom group is FIII, satisfies the relational expression: the absolute FII/FI is more than or equal to 6.0 and less than or equal to 17.5; 4.2 ≦ FII/FIII ≦ 14.5, it is beneficial to improve the transmissibility of light rays and better realize focusing and zooming by reasonably configuring the distribution mode of the optical power among the groups. Meanwhile, the number of lenses is reduced, the assembly tolerance among groups is favorably reduced, and the assembly performance of the lens is improved.
The utility model discloses the fixed focus FII of group of zoom and the wide-angle end focus fw of zoom, the satisfying relational expression between the telephoto end focus ft: FII/fw is more than or equal to 15.5 and less than or equal to 46.0; FII/ft is more than or equal to 5.0 and less than or equal to 15.5. The matching relation among the focal powers is met, a large zoom ratio is realized as far as possible under the condition of a certain total length, and the total length of the lens is limited better, so that the volume of the lens is reduced.
The utility model discloses the focus of the first piece of lens in zoom group of zoom is f5, satisfies the relational expression: FII/f5 is more than or equal to 4.5 and less than or equal to 13.5; f5/FIII is more than or equal to 0.5 and less than or equal to 1.5. Satisfying this relational expression can further promote the transmissibility of light, reduce the volume of camera lens zoom lens group, realize the reduction of lightness and handy and manufacturing cost.
The utility model discloses a zoom lens, along thing side to image side direction, satisfy the relational expression between the focus f6 of the second lens in the variable power group and the focus f9 of fifth lens: f6/f9 is more than or equal to-2.0 and less than or equal to-0.5. The zoom optical system can be effectively guaranteed to be defocused within a reasonable range (-40-80 ℃) in a high-temperature and low-temperature state by meeting the relation, and the service environment condition range of the lens is enlarged.
The utility model discloses a zoom lens, along thing side to image side direction, the abbe number of first lens, third lens and fourth lens is Vd5, Vd7, Vd8 respectively in the group 3 of becoming doubly, satisfies the relational expression: 1.2 is not less than Vd5/Vd8 is not less than 4.0; 1.2 is less than or equal to Vd7/Vd8 is less than or equal to 3.0. The chromatic aberration of the lens can be further corrected by matching the dispersion coefficients of the materials, so that the lens can clearly image visible and near infrared spectrums.
The zoom lens of the present invention satisfies the relationship between the curvature radius R2a of the object side surface of the second lens element in the compensation group 1 and the curvature radius R1b of the image side surface of the first lens element along the direction from the object side to the image side: r2a/R1a is not less than-22.0 and not more than-4.0. The matching relation among the curvature radiuses can improve the light converging efficiency of the lens and is beneficial to reducing the volume of the lens at the front end of the lens.
The utility model discloses zoom wide-angle end optics total length Lw and compensation group and zoom group satisfy the relational expression between the interval variation Lg that moves to between the telephoto end from wide-angle end: Lg/Lw is more than or equal to 0.3 and less than or equal to 0.4. With this arrangement, a large zoom ratio can be realized with a group interval variation amount as small as possible under a condition that the total lens length is constant.
Drawings
Fig. 1 schematically shows a structural view of a zoom lens wide-angle end according to embodiment 1 of the present invention;
fig. 2 schematically shows a visible light 250lp/mm-MTF diagram at the wide-angle end of the zoom lens according to embodiment 1 of the present invention;
fig. 3 schematically shows a visible light 250lp/mm-MTF diagram of a telephoto end of the zoom lens according to embodiment 1 of the present invention;
fig. 4 schematically shows a structural view of a zoom lens wide-angle end according to embodiment 2 of the present invention;
fig. 5 schematically shows a visible light 250lp/mm-MTF diagram at the wide-angle end of the zoom lens according to embodiment 2 of the present invention;
fig. 6 schematically shows a visible light 250lp/mm-MTF diagram of the telephoto end of the zoom lens according to embodiment 2 of the present invention;
fig. 7 schematically shows a structural view of a zoom lens wide-angle end according to embodiment 3 of the present invention;
fig. 8 schematically shows a visible light 250lp/mm-MTF diagram at the wide-angle end of the zoom lens according to embodiment 3 of the present invention;
fig. 9 schematically shows a visible light 250lp/mm-MTF diagram of the telephoto end of the zoom lens according to embodiment 3 of the present invention;
fig. 10 schematically shows a structural view of a zoom lens according to embodiment 4 of the present invention at the wide-angle end;
fig. 11 schematically shows a visible light 250lp/mm-MTF diagram at the wide-angle end of the zoom lens according to embodiment 4 of the present invention;
fig. 12 schematically shows a visible light 250lp/mm-MTF chart of a telephoto end of the zoom lens according to embodiment 4 of the present invention;
fig. 13 schematically shows a structural view of a wide-angle end of a zoom lens according to embodiment 5 of the present invention;
fig. 14 schematically shows a visible light 250lp/mm-MTF diagram at the wide-angle end of the zoom lens according to embodiment 5 of the present invention;
fig. 15 schematically shows a visible light 250lp/mm-MTF map of the telephoto end of the zoom lens according to embodiment 5 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," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.
Referring to fig. 1, the present invention provides a zoom lens, which includes, in order from an object side to an image side, a negative power compensation group 1, a positive power fixed group 2, and a positive power variable group 3. The compensation group 1 comprises three lenses, the fixed group 2 comprises one lens, and the zoom group 3 comprises six lenses. The zoom lens further comprises a diaphragm S which is positioned between the compensation group 1 and the fixed group 2 or between the fixed group 2 and the variable magnification group 3.
The utility model discloses a zoom lens, along thing side to image side direction, sets gradually negative power lens, negative power lens and positive power lens in the compensation group 1. According to an embodiment of the present invention, along the direction from the object side to the image side, the three lenses are sequentially set as the convex-concave type spherical lens, the concave-convex type aspheric lens, and the convex-concave type spherical lens or the convex-concave type aspheric lens.
The utility model discloses a lens among the fixed group 2 are positive focal power lens, specifically can set up to paraxial region concave and convex type sphere or aspheric surface lens.
The focal power of the six lenses in the zoom group of the utility model is sequentially set to positive, negative, positive and positive along the direction from the object side to the image side. The reasonable collocation of the positive and negative focal powers is beneficial to correcting the aberration of an optical system, ensures the high-resolution imaging of the lens, further controls the focus drift of the lens in a reasonable range in a high-temperature and low-temperature state, and realizes athermalization. And the third lens and the fourth lens form a double cemented lens set. According to an embodiment of the present invention, the six lenses are sequentially a biconvex aspheric lens, a convex aspheric lens, a biconvex spherical lens, a biconcave spherical lens, a biconvex aspheric lens, and a paraxial convex aspheric lens along the direction from the object side to the image side.
The utility model discloses a zoom is equipped with five pieces of aspherical lens at least. Satisfying this and setting is favorable to correcting the lens aberration, improves the lens resolving power to be favorable to realizing big light ring, thereby promoted the market competition of camera lens. Considering the balance of system aberration and the reasonableness of structure, the first lens in the zoom group is an aspheric lens which can reduce spherical aberration, the total length of the lens is not large, meanwhile, the zoom optical system with the ultra-large aperture is realized, and if the lens in the fixed group adopts the aspheric lens, the lens can be matched with the first lens in the zoom group 3 to realize imaging with higher resolution. If the last lens close to the image side in the zoom group 3 is an aspheric lens, residual aberrations such as curvature of field and astigmatism can be further corrected.
The utility model discloses a zoom, all aspherical lens face types satisfy following formula: z is cy2/{1+[1-(1+k)c2y2]1/2}+a4y4+a6y6+a8y8+a10y10+a12y12+a14y14+a16y16Z is the axial distance from the curved surface to the top point at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; y is the radial coordinate of the aspheric lens; k is a conic coefficient; a is4、a6、a8、a10、a12、a14、a16Respectively representing aspheric coefficients of fourth order, sixth order, eighth order, tenth order, twelfth order, fourteen order and sixteenth order.
The utility model discloses a zoom, the focus of compensation group 1 is FI, and the focus of fixed group 2 is FII, and the focus of zoom group 3 is FIII, satisfies the relational expression: the absolute FII/FI is more than or equal to 6.0 and less than or equal to 17.5; 4.2 ≦ FII/FIII ≦ 14.5, it is beneficial to improve the transmissibility of light rays and better realize focusing and zooming by reasonably configuring the distribution mode of the optical power among the groups. Meanwhile, the number of lenses is reduced, the assembly tolerance among groups is favorably reduced, and the assembly performance of the lens is improved.
The utility model discloses fixed focal length FII and the zoom wide-angle end focus fw of group 2 of zoom, the satisfying relational expression between the telephoto end focus ft: FII/fw is more than or equal to 15.5 and less than or equal to 46.0; FII/ft is more than or equal to 5.0 and less than or equal to 15.5. The matching relation among the focal powers is met, a large zoom ratio is realized as far as possible under the condition of a certain total length, and the total length of the lens is limited better, so that the volume of the lens is reduced.
The utility model discloses the focus of the first piece of lens in zoom group 3 is f5, satisfies the relational expression: FII/f5 is more than or equal to 4.5 and less than or equal to 13.5; f5/FIII is more than or equal to 0.5 and less than or equal to 1.5. Satisfying this relational expression can further promote the transmissibility of light, reduce the volume of camera lens zoom lens group, realize the reduction of lightness and handy and manufacturing cost.
The utility model discloses a zoom lens, along thing side to image side direction, satisfy the relational expression between the focus f6 of the second lens in the variable power group 3 and the focus f9 of fifth lens: f6/f9 is more than or equal to-2.0 and less than or equal to-0.5. The zoom optical system can be effectively prevented from defocusing at the high and low temperature states (minus 40-80 ℃) by satisfying the relation, and the image quality is improved.
The utility model discloses a zoom lens, along thing side to image side direction, the abbe number of first lens, third lens and fourth lens is Vd5, Vd7, Vd8 respectively in the group 3 of becoming doubly, satisfies the relational expression: 1.2 is not less than Vd5/Vd8 is not less than 4.0; 1.2 is less than or equal to Vd7/Vd8 is less than or equal to 3.0. The chromatic aberration of the lens can be further corrected by matching the dispersion coefficients of the materials, so that the lens can clearly image visible and near infrared spectrums.
The zoom lens of the present invention satisfies the relationship between the curvature radius R2a of the object side surface of the second lens element in the compensation group 1 and the curvature radius R1b of the image side surface of the first lens element along the direction from the object side to the image side: r2a/R1a is not less than-22.0 and not more than-4.0. The matching relation among the curvature radiuses can improve the light converging efficiency of the lens and is beneficial to reducing the volume of the lens at the front end of the lens.
The utility model discloses zoom wide-angle end optics total length Lw and compensation group 1 and zoom group 3 satisfy the relational expression between the interval variation Lg that moves to between the telephoto end from wide-angle end: Lg/Lw is more than or equal to 0.3 and less than or equal to 0.4. With this arrangement, a large zoom ratio can be realized with a group interval variation amount as small as possible under a condition that the total lens length is constant.
In conclusion, the utility model discloses a zoom lens passes through the setting of each group lens quantity, the reasonable collocation of focal power, abbe number and sphere, aspheric surface between each lens, when guaranteeing super large light ring zoom optical system, high-resolution, infrared confocal, high low temperature performance, can also reduce camera lens volume, weight, promotes the assemblability of camera lens, has greatly reduced manufacturing cost.
The zoom lens of the present invention will be described in detail below with reference to the above-described arrangements of the present invention by giving five groups of embodiments. In the following embodiments, the surfaces of the respective lenses are represented by 1, 2, …, and N, where the cemented surface of the cemented lens group is one surface and the stop is STO. The parameter settings of the respective embodiments satisfy the following table 1:
TABLE 1
The first embodiment:
as shown in fig. 1, in the present embodiment, the compensation group 1 includes three lenses, the fixed group 2 includes one lens, and the variable power group 3 includes six lenses. The diaphragm 3 is positioned between the compensation group 1 and the fixed group 2, and the third lens and the fourth lens in the variable-power group 3 are combined into a double-cemented lens group. In the object-side to image-side direction, the second lens, the third lens, the lens in the fixed group 1, the first lens, the second lens, the fifth lens, and the sixth lens in the variable power group 3 employ aspherical lenses. The focal length of the zoom lens in this embodiment is 2.9mm to 8.7mm, and the F-number of the lens is 1.2 to 2.6.
The parameters associated with each lens, including surface type, radius of curvature, thickness value, refractive index, abbe number and K value, are shown in table 2 below:
TABLE 2
Table 3: example A K value and aspherical surface coefficient
TABLE 3
Table 4: variable spacing values from wide-angle end to telephoto end
TABLE 4
As can be seen from fig. 2 to 3, the zoom lens of the present embodiment has high pixel, ultra-large aperture zoom optical system, high resolution, infrared confocal property, and high and low temperature non-defocusing property.
The second embodiment:
as shown in fig. 4, in the present embodiment, the compensation group 1 includes three lenses, the fixed group 2 includes one lens, and the variable power group 3 includes six lenses. The diaphragm 3 is positioned between the compensation group 1 and the fixed group 2, and the third lens and the fourth lens in the variable-power group 3 are combined into a double-cemented lens group. In the object-side to image-side direction, the second lens, the third lens in the compensation group 1, and the first lens, the second lens, the fifth lens, and the sixth lens in the variable power group 3 employ aspheric lenses. The focal length of the zoom lens in this embodiment is 3.0mm to 9.4mm, and the F-number of the lens is 1.2 to 2.6.
The parameters associated with each lens, including surface type, radius of curvature, thickness value, refractive index, abbe number and K value, are shown in table 5 below:
TABLE 5
Table 6: example two K value and aspherical surface coefficient
TABLE 6
Table 7: variable spacing values from wide-angle end to telephoto end
| Surface number | Thickness of | Wide angle end | Telescope end |
| 6 | D1 | 14.53 | 2.96 |
| 9 | D2 | 7.00 | 0.12 |
| 20 | D3 | 3.39 | 10.27 |
TABLE 7
As can be seen from fig. 5 to 6, the zoom lens according to the present embodiment has high pixel, ultra-large aperture zoom optical system, high resolution, infrared confocal property, and high and low temperature non-defocusing property.
Third embodiment:
as shown in fig. 7, in the present embodiment, the compensation group 1 includes three lenses, the fixed group 2 includes one lens, and the variable power group 3 includes six lenses. The diaphragm 3 is positioned between the fixed group 2 and the variable-power group 3, and the third lens and the fourth lens in the variable-power group 3 are combined into a double cemented lens group. In the object-side to image-side direction, the second lens in the compensation group 1, the lens in the fixed group 2, and the first lens, the second lens, the fifth lens, and the sixth lens in the variable power group 3 employ aspherical lenses. The zoom lens in this embodiment has a focal length of 3.2mm to 9.37mm and an F-number of 1.2 to 2.6.
The parameters associated with each lens, including surface type, radius of curvature, thickness value, refractive index, abbe number and K value, are shown in table 8 below:
| surface number | Surface type | Radius of curvature | Thickness of | Refractive index | Abbe number |
| 1 | Spherical surface | 76.835 | 1.20 | 1.571 | 68.74 |
| 2 | Spherical surface | 7.798 | 5.68 | ||
| 3 | Aspherical surface | -58.148 | 1.10 | 1.536 | 55.98 |
| 4 | Aspherical surface | 7.830 | 0.62 | ||
| 5 | Spherical surface | 11.076 | 2.07 | 1.847 | 19.6 |
| 6 | Spherical surface | 24.138 | D1 | ||
| 7 | Aspherical surface | 22.905 | 1.05 | 1.536 | 55.98 |
| 8 | Aspherical surface | 87.232 | 0.68 | ||
| 9(STO) | Spherical surface | Infinity | D2 | ||
| 10 | Aspherical surface | 6.687 | 3.76 | 1.50 | 62.85 |
| 11 | Aspherical surface | -17.786 | 0.08 | ||
| 12 | Aspherical surface | 11.398 | 0.85 | 1.634 | 24.176 |
| 13 | Aspherical surface | 4.678 | 0.09 | ||
| 14 | Spherical surface | 5.554 | 3.14 | 1.60 | 58.164 |
| 15 | Spherical surface | -6.123 | 0.39 | 1.749 | 34.23 |
| 16 | Spherical surface | 5.684 | 0.45 | ||
| 17 | Aspherical surface | 103.120 | 1.26 | 1.640 | 22.41 |
| 18 | Aspherical surface | -9.397 | 0.05 | ||
| 19 | Aspherical surface | 4.891 | 0.80 | 1.536 | 55.87 |
| 20 | Aspherical surface | 6.726 | D3 | ||
| 21 | Spherical surface | Infinity | 0.70 | 1.517 | 64.21 |
| 22 | Spherical surface | Infinity | 1.10 | ||
| Image plane | Spherical surface | Infinity | - |
TABLE 8
Table 9: example three K values and aspherical surface coefficients
TABLE 9
Table 10: variable spacing values from wide-angle end to telephoto end
| Surface number | Thickness of | Wide angle end | Telescope end |
| 6 | D1 | 15.24 | 1.59 |
| 9(STO) | D2 | 6.59 | 0.3 |
| 20 | D3 | 3.8 | 10.09 |
Watch 10
As can be seen from fig. 8 to 9, the zoom lens according to the present embodiment has high pixel, ultra-large aperture zoom optical system, high resolution, infrared confocal property, and high and low temperature non-defocusing property.
Fourth embodiment:
as shown in fig. 10, in the present embodiment, the compensation group 1 includes three lenses, the fixed group 2 includes one lens, and the variable power group 3 includes six lenses. The diaphragm 3 is positioned between the compensation group 1 and the fixed group 2, and the third lens and the fourth lens in the variable-power group 3 are combined into a double-cemented lens group. In the object-side to image-side direction, the second lens in the compensation group 1, the lens in the fixed group 2, and the first lens, the second lens, the fifth lens, and the sixth lens in the variable power group 3 employ aspherical lenses. The focal length of the zoom lens in this embodiment is 3.15mm to 9.1mm, and the F-number of the lens is 1.2 to 2.6.
The parameters associated with each lens, including surface type, radius of curvature, thickness value, refractive index, abbe number and K value, are shown in table 11 below:
| surface number | Surface type | Radius of curvature | Thickness of | Refractive index | Abbe number |
| 1 | Spherical surface | 26.756 | 1.13 | 1.766 | 59.21 |
| 2 | Spherical surface | 7.424 | 5.76 | ||
| 3 | Aspherical surface | -158.031 | 1.03 | 1.529 | 62.34 |
| 4 | Aspherical surface | 9.771 | 0.35 | ||
| 5 | Spherical surface | 14.482 | 1.60 | 1.999 | 13.25 |
| 6 | Spherical surface | 23.943 | D1 | ||
| 7(STO) | Spherical surface | Infinity | 0.30 | ||
| 8 | Aspherical surface | 20.134 | 0.95 | 1.555 | 65.99 |
| 9 | Aspherical surface | 46.727 | D2 | ||
| 10 | Aspherical surface | 6.550 | 4.55 | 1.503 | 95.00 |
| 11 | Aspherical surface | -15.055 | 0.20 | ||
| 12 | Aspherical surface | 10.686 | 0.85 | 1.598 | 39.89 |
| 13 | Aspherical surface | 4.318 | 0.40 | ||
| 14 | Spherical surface | 5.208 | 2.63 | 1.571 | 55.00 |
| 15 | Spherical surface | -11.213 | 0.29 | 1.757 | 25.55 |
| 16 | Spherical surface | 5.525 | 0.70 | ||
| 17 | Aspherical surface | 37.504 | 1.22 | 1.657 | 23.11 |
| 18 | Aspherical surface | -10.629 | 0.22 | ||
| 19 | Aspherical surface | 5.841 | 0.81 | 1.549 | 60.02 |
| 20 | Aspherical surface | 6.817 | D3 | ||
| 21 | Spherical surface | Infinity | 0.70 | 1.517 | 64.2 |
| 22 | Spherical surface | Infinity | 1.10 | ||
| Image plane | Spherical surface | Infinity | - |
TABLE 11
Table 12: example four K values and aspherical surface coefficients
TABLE 12 TABLE 13 variable spacing values from wide-angle end to telephoto end
| Surface number | Thickness of | Wide angle end | Telescope end |
| 6 | D1 | 17.05 | 3.24 |
| 9 | D2 | 6.63 | 0.28 |
| 20 | D3 | 3.31 | 9.654 |
Watch 13
As can be seen from fig. 11 to 12, the zoom lens according to the present embodiment has high pixel, ultra-large aperture zoom optical system, high resolution, infrared confocal property, and high and low temperature non-defocusing property.
Fifth embodiment:
as shown in fig. 13, in the present embodiment, the compensation group 1 includes three lenses, the fixed group 2 includes one lens, and the variable power group 3 includes six lenses. The diaphragm 3 is positioned between the fixed group 2 and the variable-power group 3, and the third lens and the fourth lens in the variable-power group 3 are combined into a double cemented lens group. In the object-side to image-side direction, the second lens, the third lens, the lens in the fixed group 1, the first lens, the second lens, the fifth lens, and the sixth lens in the variable power group 3 employ aspherical lenses. The focal length of the zoom lens in this embodiment is 3.15mm to 9.44mm, and the F-number of the lens is 1.2 to 2.6.
The parameters associated with each lens, including surface type, radius of curvature, thickness value, refractive index, abbe number and K value, are shown in table 14 below:
TABLE 14
Table 15: example five K value and aspherical surface coefficient
Watch 15
Table 16: variable spacing values from wide-angle end to telephoto end
| Surface number | Thickness of | Wide angle end | Telescope end |
| 6 | D1 | 14.76 | 2.24 |
| 9(STO) | D2 | 7.02 | 0.14 |
| 20 | D3 | 4.12 | 11.00 |
TABLE 16
As shown in fig. 4 to 15, the zoom lens according to the present embodiment has high-pixel, ultra-large-aperture zoom optical system, high-resolution, infrared confocal, and high-low temperature non-defocusing performance.
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 (20)
1. The zoom lens is characterized by sequentially comprising a compensation group (1) with negative focal power, a fixed group (2) with positive focal power and a zoom group (3) with positive focal power along the direction from an object side to an image side, wherein the compensation group (1) comprises three lenses, the fixed group (2) comprises one lens, and the zoom group (3) comprises six lenses.
2. The zoom lens according to claim 1, wherein the powers of the six lenses in the variable power group (3) are positive, negative, positive and positive in order from the object side to the image side.
3. A zoom lens according to claim 2, wherein the third lens element and the fourth lens element of the magnification-varying group (3) form a cemented doublet in an object-to-image direction.
4. The zoom lens according to claim 2, wherein the six lenses of the zoom group (3) are sequentially an aspheric lens, a spherical lens, an aspheric lens, and an aspheric lens along the object-side to image-side directions.
5. The zoom lens according to claim 4, wherein the six lenses in the zoom group (3) are a biconvex lens, a concave-convex lens, a biconvex lens, a biconcave lens, a biconvex lens, and a paraxial concave-convex lens in sequence from the object side to the image side.
6. A zoom lens according to any one of claims 1 to 5, wherein the fixed group (2) has a focal length FII, the variable group (3) has a focal length FIII, and the first lens in the variable group (3) has a focal length f5 in the object-to-image direction, which satisfies the following relation: FII/f5 is more than or equal to 4.5 and less than or equal to 13.5; f5/FIII is more than or equal to 0.5 and less than or equal to 1.5.
7. A zoom lens according to any one of claims 1 to 5, wherein the focal length f6 of the second lens and the focal length f9 of the fifth lens in the variable power group (3) satisfy the relationship: f6/f9 is more than or equal to-2.0 and less than or equal to-0.5.
8. A zoom lens according to any one of claims 1 to 5, wherein the Abbe numbers of the first, third and fourth lenses in the magnification-varying group (3) are Vd5, Vd7, Vd8, respectively, in an object-side to image-side direction, and satisfy the relationship: 1.2 is not less than Vd5/Vd8 is not less than 4.0; 1.2 is less than or equal to Vd7/Vd8 is less than or equal to 3.0.
9. A zoom lens according to claim 1, wherein a negative power lens, a negative power lens and a positive power lens are disposed in the compensation group (1) in order from the object side to the image side.
10. A zoom lens according to claim 9, wherein the compensation group (1) comprises a spherical lens, an aspherical lens and a spherical lens or an aspherical lens in order from the object side to the image side.
11. The zoom lens according to claim 10, wherein the compensation group (1) comprises a concave-convex lens, a concave-convex lens and a concave-convex lens in sequence from the object side to the image side.
12. A zoom lens according to claim 10 or 11, wherein, in the object-side to image-side direction, the radius of curvature R2a of the object-side surface of the second lens in the compensation group (1) and the radius of curvature R1b of the image-side surface of the first lens satisfy the following relation: r2a/R1a is not less than-22.0 and not more than-4.0.
13. A zoom lens according to claim 1, characterized in that the lenses in the fixed group (2) are spherical lenses or aspherical lenses.
14. A zoom lens according to claim 13, wherein the lenses in the fixed group (2) are paraxial convex-concave lenses.
15. A zoom lens according to claim 13 or 14, characterized in that the lenses in the fixed group (2) are positive power lenses.
16. The zoom lens according to claim 1, wherein the zoom lens includes at least five aspherical lenses.
17. A zoom lens according to claim 1, characterized in that it further comprises a stop (S) located between the compensating group (1) and the fixed group (2) or between the fixed group (2) and the variable magnification group (3).
18. A zoom lens according to claim 1, wherein the focal length of the compensation group (1) is FI, the focal length of the fixed group (2) is FII, and the focal length of the variable magnification group (3) is FIII, satisfying the relation: the absolute FII/FI is more than or equal to 6.0 and less than or equal to 17.5; the absolute value FII/FIII is more than or equal to 4.2 and less than or equal to 14.5.
19. A zoom lens according to claim 1, wherein the focal length FII of the fixed group (2) and the wide-angle end focal length fw and the telephoto end focal length ft of the zoom lens satisfy the relation: FII/fw is more than or equal to 15.5 and less than or equal to 46.0; FII/ft is more than or equal to 5.0 and less than or equal to 15.5.
20. A zoom lens according to claim 1, wherein the zoom lens has a wide-angle end optical total length Lw and a pitch change Lg between the compensation group (1) and the magnification-varying group (3) moving from the wide-angle end to the telephoto end which satisfy the relation: Lg/Lw is more than or equal to 0.3 and less than or equal to 0.4.
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| CN202120599424.XU CN214846007U (en) | 2021-03-24 | 2021-03-24 | Zoom lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904543A (en) * | 2021-03-24 | 2021-06-04 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114967083A (en) * | 2022-05-25 | 2022-08-30 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN115373120A (en) * | 2021-12-29 | 2022-11-22 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
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2021
- 2021-03-24 CN CN202120599424.XU patent/CN214846007U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904543A (en) * | 2021-03-24 | 2021-06-04 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN115373120A (en) * | 2021-12-29 | 2022-11-22 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
| CN114967083A (en) * | 2022-05-25 | 2022-08-30 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114967083B (en) * | 2022-05-25 | 2024-03-19 | 舜宇光学(中山)有限公司 | Zoom lens |
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