CN115128785B - Zoom lens - Google Patents

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Publication number
CN115128785B
CN115128785B CN202210962867.XA CN202210962867A CN115128785B CN 115128785 B CN115128785 B CN 115128785B CN 202210962867 A CN202210962867 A CN 202210962867A CN 115128785 B CN115128785 B CN 115128785B
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lens
equal
zoom
zoom lens
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CN115128785A (en
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韦晓鹏
周小青
蓝岚
梁伟朝
应永茂
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Sunny Optics Zhongshan Co Ltd
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Sunny Optics Zhongshan Co Ltd
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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
    • G02B15/142—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 two groups only
    • G02B15/1425—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 two groups only the first group being negative

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention relates to a zoom lens, which sequentially comprises a compensation lens group with negative focal power, a diaphragm and a zoom lens group with positive focal power along the direction from an object side to an image side, wherein the compensation lens group and the zoom lens group can move along the optical axis, the compensation lens group sequentially comprises a first lens, a second lens and a third lens, the zoom lens group sequentially comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens, the fifth lens is a paraxial region concave-concave lens, the eighth lens is a concave-concave lens, and the sixth lens is a convex-concave lens. The positive and negative focal power and the lens shape of the lens are reasonably distributed, and the positive and negative focal power of the lens group is reasonably distributed, so that the resolution of the lens is effectively improved.

Description

Zoom lens
Technical Field
The invention relates to the field of optical lenses, in particular to a zoom lens.
Background
In recent years, the zoom lens can meet various monitoring market demands due to the variable focal length, and with the rapid development of security industry and the increasingly strong market competition pressure, higher demands are put forward on the performance, function and compatibility of the lens. Most of the low-magnification zoom lenses in the market at present still have some performance defects to limit the use scenes, such as insufficient resolution and lower resolution.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a zoom lens capable of improving the resolution of the lens.
The embodiment of the invention provides a zoom lens, which sequentially comprises a compensation lens group with negative focal power, a diaphragm and a zoom lens group with positive focal power along the direction from an object side to an image side, wherein the compensation lens group and the zoom lens group can move along the optical axis, the compensation lens group sequentially comprises a first lens, a second lens and a third lens, the zoom lens group sequentially comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens, the fifth lens is a concave-concave lens in a paraxial region, the eighth lens is a concave-concave lens, and the sixth lens is a convex-concave lens.
Preferably, the first lens and the second lens have negative optical power, and the third lens has positive optical power.
Preferably, the first lens is a convex-concave lens, the second lens is a paraxial region concave-concave lens, and the third lens is a paraxial region convex-convex lens.
Preferably, the first lens is a glass lens, and the second lens and the third lens are plastic lenses.
Preferably, the first lens is a spherical lens, and the second lens and the third lens are aspherical lenses.
Preferably, the fourth lens, the sixth lens, the seventh lens, and the ninth lens have positive optical power, and the fifth lens, the eighth lens, and the tenth lens have negative optical power.
Preferably, the fourth lens and the seventh lens are convex-convex lenses, the tenth lens is a paraxial region convex-concave lens, and the ninth lens is a paraxial region convex-concave lens or a paraxial region convex-convex lens.
Preferably, the fourth lens, the seventh lens and the eighth lens are glass lenses, and the fifth lens, the sixth lens, the ninth lens and the tenth lens are plastic lenses.
Preferably, the fourth lens, the seventh lens and the eighth lens are spherical lenses, and the fifth lens, the sixth lens and the tenth lens are aspherical lenses.
Preferably, the seventh lens and the eighth lens constitute a double cemented lens.
According to one aspect of the embodiment of the invention, the positive and negative focal power and the lens shape of the lens are reasonably distributed as a whole, and the positive and negative focal power of the lens group is reasonably distributed, so that the resolution is effectively improved, and particularly, the resolution of more than 4K (8 MP) can be obtained.
According to one aspect of the embodiment of the invention, the curvature radius of the object plane and the image plane of the first lens is reasonably set, so that the field range at the wide-angle end of the zoom lens is wider, and especially can reach more than 120 degrees.
According to one aspect of the embodiment of the invention, the variable-magnification lens is from the wide-angle end to the telescopic end, the variable-magnification range is about 3 times, the requirement of miniaturization of the lens can be met, and the compatibility is higher.
According to one aspect of the embodiment of the invention, the zoom lens adopts a glass-plastic mixed structure, reduces design and production cost while guaranteeing resolution, and meets the requirement of no virtual focus in a temperature range of-40-80 ℃.
According to one aspect of the embodiment of the invention, the lens assembly is provided with the double-cemented lens, and the refractive index and the Abbe number range of the double-cemented lens are reasonably set, so that the chromatic aberration of the lens assembly can be corrected, the single-component product and the assembly tolerance are good, and the visible light and the infrared light are confocal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an optical schematic diagram of a wide-angle end of a zoom lens according to a first embodiment of the present invention;
fig. 2 is a schematic optical structure of a telescopic end of a zoom lens according to a first embodiment of the present invention;
fig. 3 is an optical schematic diagram of a wide-angle end of a zoom lens according to a second embodiment of the present invention;
fig. 4 is a schematic optical structure diagram of a zoom lens according to a second embodiment of the present invention;
fig. 5 is an optical structure diagram of a wide-angle end of a zoom lens according to a third embodiment of the present invention;
fig. 6 is a schematic optical structure of a telescopic end of a zoom lens according to a third embodiment of the present invention.
Reference numerals illustrate:
diaphragm-STO, parallel plate-CG, image plane-IMA;
a first lens-L1, a second lens-L2, a third lens-L3, a fourth lens-L4, a fifth lens-L5, a sixth lens-L6, a seventh lens-L7, an eighth lens-L8, a ninth lens-L9 and a tenth lens-L10.
Detailed Description
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are a complete description of the embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated simply or conveniently. Furthermore, portions of the structures in the drawings will be described in terms of separate descriptions, and it should be noted that elements not shown or described in the drawings are in a form known to those of ordinary skill in the art.
Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments will refer to combinations of features, which may be present alone or in combination, and the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
As shown in fig. 1 and 2, the zoom lens according to the embodiment of the present invention is schematically shown in optical structures at the wide-angle end and the telephoto end, respectively. The zoom lens sequentially comprises a compensation lens group with negative focal power, a diaphragm STO and a zoom lens group with positive focal power from an object side to an image side along an optical axis. The compensation lens group and the variable magnification lens group are movable along an optical axis. The compensating lens group comprises a first lens L1, a second lens L2 and a third lens L3. The variable magnification lens group includes a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10. Wherein the fifth lens L5 and the eighth lens L8 are concave-concave lenses, and the sixth lens L6 is a convex-concave lens.
The optical system of the zoom lens of the embodiment reasonably distributes positive and negative focal power of the lens group, can effectively improve resolution, and particularly can reach more than 4K (8 MP).
As shown in fig. 1 and 2, in the present embodiment, the zoom lens further includes a parallel plate CG and an image plane IMA located behind the magnification-varying lens group in a direction from the object side to the image side of the optical axis. During zooming, the compensation lens group moves to focus the image plane IMA, and the zoom lens group moves to adjust the focal length of the lens.
As shown in fig. 1 and 2, in the present embodiment, the first lens L1 has negative optical power and is a convex-concave glass spherical lens. The second lens L2 has negative focal power and is a paraxial concave plastic aspherical lens. The third lens L3 has positive focal power and is a paraxial region convex plastic aspherical lens. The fourth lens L4 has positive power and is a convex glass spherical lens. The fifth lens L5 has negative focal power and is a paraxial concave plastic aspherical lens. The sixth lens L6 has positive focal power and is a paraxial region convex-concave plastic aspherical lens. The seventh lens L7 has positive power and is a convex glass spherical lens. The eighth lens L8 has negative power and is a concave glass spherical lens. The ninth lens L9 has positive power and is a paraxial convex-concave type or a paraxial convex type plastic aspherical lens. The tenth lens L10 has negative focal power and is a paraxial region convex-concave plastic aspherical lens. Therefore, the optical system of the zoom lens of the embodiment reasonably prepares the focal power, the shape, the materials and the like of each lens, can enable the resolution to reach more than 4K, adopts a glass-plastic mixed structure, reduces the production cost while guaranteeing high resolution, and meets the requirement of no virtual focus in the temperature range of-40-80 ℃ (namely minus 40-80 ℃).
As shown in fig. 1 and 2, in the present embodiment, the seventh lens L7 and the eighth lens L8 form a double-cemented lens, which can correct chromatic aberration of ultraviolet light and infrared light, and realize infrared focusing, and the use at night does not need refocusing, and the single-component product and the assembly tolerance are better, and the manufacturing property is good, which is helpful for improving the resolution of the product. Preferably, the following relationship is satisfied between the focal length FA of the cemented doublet composed of the seventh lens L7 and the eighth lens L8 and the focal length F2 of the variable magnification lens group: FA/F2 of 7.53 or less or 25.86 or less. The focal length of the cemented lens group is within the above range, and the resolution of the optical system of the zoom lens can be ensured to be optimal.
As shown in fig. 1 and 2, in the present embodiment, the focal length F1 of the compensation lens group and the wide-angle end focal length Fw of the zoom lens satisfy the following relationship: -2.83 < F1/Fw < 2.39; the focal length F1 of the compensation lens group and the telephoto end focal length Ft of the zoom lens satisfy the following relationship: F1/Ft is less than or equal to-0.94 and less than or equal to-0.80. The focal length of the compensation lens group is within this range, and the resolution of the optical system of the zoom lens can be ensured to be optimal.
As shown in fig. 1 and 2, in the present embodiment, the focal length F2 of the variable magnification lens group and the wide-angle end focal length Fw of the zoom lens satisfy the following relationship: F2/Fw is more than or equal to 2.75 and less than or equal to 3.01; the focal length F2 of the zoom lens group and the telephoto end focal length Ft of the zoom lens satisfy the following relationship: F2/Ft is more than or equal to 0.97 and less than or equal to 1.03. The focal length of the zoom lens group is within this range, and the resolution of the optical system of the zoom lens can be ensured to be optimal.
As shown in fig. 1 and 2, in the present embodiment, the wide-angle end focal length Fw of the zoom lens and the total optical length TTL of the wide-angle end of the zoom lens satisfy the following relationship: fw/TTL is more than or equal to 0.06 and less than or equal to 0.08; the following relationship is satisfied between the focal length Ft at the telephoto end of the zoom lens and the total optical length TTL at the wide-angle end of the zoom lens: ft/TTL is more than or equal to 0.20 and less than or equal to 0.22. Therefore, the variable-focus lens is from the wide-angle end to the telescopic end, the magnification variation range is about 3 times, and the miniaturization requirement of the lens is met.
As shown in fig. 1 and 2, in the present embodiment, the refractive index n1 of the first lens L1 satisfies the following relationship: n1 is more than or equal to 1.70 and less than or equal to 1.83; the abbe number vd1 of the first lens L1 satisfies the following relationship: and (3) vd1 is more than or equal to 43.90 and 57.40. The first lens L1 is made of high-refraction materials, so that the optical system of the zoom lens is beneficial to collect light, the wide-angle end view field range is wider, especially, the range can reach more than 120 degrees, and meanwhile, the lens miniaturization is facilitated, and the compatibility of the lens is improved.
As shown in fig. 1 and 2, in the present embodiment, the refractive index n7 of the seventh lens L7 satisfies the following relationship: n7 is more than or equal to 1.43 and less than or equal to 1.47; the abbe number vd7 of the seventh lens L7 satisfies the following relationship: 88.56 vd7 is less than or equal to 96.74; the refractive index n8 of the eighth lens L8 satisfies the following relationship: n8 is more than or equal to 1.65 and less than or equal to 1.85; the abbe number vd8 of the eighth lens L8 satisfies the following relationship: 23.30.ltoreq.vd8.ltoreq. 34.30. The refractive index and abbe number of the seventh lens L7 and the eighth lens L8 are in the above ranges, chromatic aberration can be effectively corrected, visible light and infrared light are confocal, and the resolution of the zoom lens is further improved.
As shown in fig. 1 and 2, in the present embodiment, the compensation lens group movement distance T1 and the variable magnification lens group movement distance T2 satisfy the following relationship: T1/T2 is more than or equal to 0.92 and less than or equal to 1.65. Thus, the zoom lens has a quicker focusing response speed from the wide-angle end to the telephoto end.
As shown in fig. 1 and 2, in the present embodiment, the object-side curvature radius R1 and the image-side curvature radius R2 of the first lens L1 satisfy the following relationship: R1/R2 is more than or equal to 6.51 and less than or equal to 20.05. The curvature radius of the two surfaces of the first lens L1 is reasonably set, so that the wide-angle end field range of the zoom lens is wider, and especially can reach more than 120 degrees.
In summary, the zoom lens of the embodiment of the invention has the following beneficial effects:
(1) The positive and negative focal power and the lens shape of the lens are reasonably distributed, and the positive and negative focal power of the group is reasonably distributed, so that the resolution reaches more than 4K (8 MP);
(2) By reasonably setting the curvature radius values of the two surfaces of the first lens L1, the wide-angle end view field range is wide and can reach more than 120 degrees;
(3) From the wide-angle end to the telephoto end, the magnification variation range is about 3 times, and the miniaturization of the lens is satisfied;
(4) The glass-plastic mixed structure is adopted, so that the design cost is reduced while the high resolution is ensured, and the condition that no virtual focus exists in the temperature range of-40 ℃ to 80 ℃ is satisfied;
(5) The lens has the advantages that the lens is provided with the cementing lens, and the refractive index and Abbe number range of the lens are reasonably set, so that single-component products and assembly tolerance are good, the manufacturability is good, the visible light and infrared light are confocal, and chromatic aberration of the lens can be effectively corrected.
The zoom lens of the present invention will be specifically described below with reference to the drawings and tables in three embodiments. In the following embodiments, the present invention refers to the stop STO as one side and the image plane IMA as one side.
The parameters of the respective examples specifically satisfying the above conditional expression are shown in the following table 1:
TABLE 1
In an embodiment of 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 with the height y perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a is that 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The fourth order, sixth order, eighth order, tenth order, fourteenth order, sixteen order, respectively, are aspherical coefficients.
Example 1
As shown in fig. 1 and 2, in the first embodiment, the WIDE-angle end focal length fw=3.39 mm, the telephoto end focal length ft=10.19 mm, the aperture coefficient FNO (WIDE) =1.62, the curvature radius R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the zoom lens are referred to in the following table (table 2):
TABLE 2
In table 2, the surface numbers refer to surfaces of the zoom lens from the object side to the Image side, for example, the surface numbers 1 and 2 represent two surfaces of the first lens L1, the surface numbers 3 and 4 represent two surfaces of the second lens L2, and so on, and Image is an Image plane IMA, and values of D1, D2, and D3 are as shown in the following table (table 3):
wide angle end Telescope end
D1 12.71 1.59
D2 7.76 0.35
D3 2.38 9.79
TABLE 3 Table 3
In the first embodiment, the K value and aspherical coefficient of the zoom lens are shown in the following table (table 4):
face number K value A4 A6 A8 A10 A12 A14 A16
3 -23.26 -1.24E-03 3.47E-05 -8.70E-07 1.21E-08 -8.37E-11 0.00E+00 0.00E+00
4 12.02 -5.53E-04 -5.69E-06 2.97E-09 3.10E-09 -9.18E-11 0.00E+00 0.00E+00
5 9.75 5.61E-05 -9.01E-06 1.04E-07 1.43E-09 -1.40E-10 0.00E+00 0.00E+00
6 2.38 -2.21E-05 2.44E-06 1.10E-07 -7.57E-09 4.71E-11 0.00E+00 0.00E+00
10 90.00 -2.36E-03 3.91E-05 -4.11E-07 3.68E-08 -7.66E-10 0.00E+00 0.00E+00
11 -11.98 -1.01E-03 4.82E-06 8.76E-07 -4.69E-09 2.65E-10 0.00E+00 0.00E+00
12 -2.13 -3.90E-04 9.89E-06 3.82E-07 -5.10E-09 4.59E-10 0.00E+00 0.00E+00
13 -79.54 -1.79E-03 5.19E-05 -6.11E-07 6.55E-09 4.16E-11 0.00E+00 0.00E+00
17 -8.29 -4.31E-03 -2.31E-04 3.24E-05 8.95E-07 -7.29E-08 0.00E+00 0.00E+00
18 52.39 -4.59E-03 5.29E-05 1.75E-05 -1.32E-06 9.12E-08 0.00E+00 0.00E+00
19 -45.61 -1.47E-04 -2.50E-04 -9.07E-06 -1.67E-06 1.44E-07 0.00E+00 0.00E+00
20 4.34 -2.07E-03 -1.59E-04 -3.53E-05 3.28E-06 -8.09E-08 0.00E+00 0.00E+00
TABLE 4 Table 4
As shown in fig. 1-2 and tables 2 to 4, the zoom lens of the present embodiment can support a resolution of 4K (8 MP) or more, can reach a wide-angle end view range of 120 ° or more, has a magnification variation range from the wide-angle end to the telephoto end of about 3 times, can meet the requirements of miniaturization of the lens, can reduce design and production costs while guaranteeing resolution, and can meet the temperature range of-40 ℃ to 80 ℃ without virtual focus, can correct chromatic aberration of the zoom lens, and can make visible light and infrared light confocal, and the single-component product and assembly tolerance are good.
Example two
As shown in fig. 3 and 4, in the second embodiment, the WIDE-angle end focal length fw=3.40 mm, the telephoto end focal length ft=10.14 mm, the aperture coefficient FNO (WIDE) =1.64, the curvature radius R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the zoom lens are referred to in the following table (table 5):
face number Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd
1 Spherical surface 45.40 0.65 1.73 54.7
2 Spherical surface 6.18 5.29
3 Aspherical surface -19.61 1.26 1.54 55.7
4 Aspherical surface 14.76 0.20
5 Aspherical surface 23.72 1.80 1.64 23.5
6 Aspherical surface -30.64 D1
STO Spherical surface Infinity D2
8 Spherical surface 7.16 4.15 1.44 95.1
9 Spherical surface -14.24 0.10
10 Aspherical surface -31.69 0.90 1.64 23.5
11 Aspherical surface 12.64 0.10
12 Aspherical surface 8.40 1.77 1.66 20.4
13 Aspherical surface 30.76 0.10
14 Spherical surface 7.06 3.52 1.44 95.1
15 Spherical surface -7.06 0.60 1.78 25.7
16 Spherical surface 20.30 0.61
17 Aspherical surface 21.42 1.37 1.64 23.5
18 Aspherical surface -15.89 0.13
19 Aspherical surface 15.56 0.80 1.54 55.7
20 Aspherical surface 7.45 D3
21 Spherical surface Infinity 0.40 1.52 64.2
22 Spherical surface Infinity 4.50
Image Spherical surface Infinity -
TABLE 5
In table 5, the values of D1, D2 and D3 are found in the following table (table 6):
wide angle end Telescope end
D1 10.73 2.25
D2 8.45 0.50
D3 0.69 8.64
TABLE 6
In the second embodiment, the K value and aspherical coefficient of the zoom lens are shown in the following table (table 7):
face number K value A4 A6 A8 A10 A12 A14 A16
3 8.79 -3.67E-04 1.09E-05 -1.50E-07 -6.69E-10 6.94E-11 0.00E+00 0.00E+00
4 4.20 -5.21E-04 -2.65E-05 6.75E-07 -9.20E-09 -1.52E-10 0.00E+00 0.00E+00
5 1.92 1.12E-04 -3.00E-05 1.16E-06 -2.19E-08 -1.23E-10 0.00E+00 0.00E+00
6 1.79 -1.01E-04 -3.17E-06 4.87E-07 -1.83E-08 8.63E-11 0.00E+00 0.00E+00
10 28.99 -1.36E-03 -2.16E-06 1.49E-06 -1.25E-08 -2.15E-10 0.00E+00 0.00E+00
11 3.73 -1.64E-03 -4.73E-06 1.17E-06 -1.41E-09 -2.01E-10 0.00E+00 0.00E+00
12 -6.43 1.89E-04 -4.63E-06 2.72E-07 6.39E-09 -2.68E-10 0.00E+00 0.00E+00
13 -74.19 -1.58E-03 4.92E-05 -1.08E-06 1.09E-08 -1.75E-10 0.00E+00 0.00E+00
17 -37.45 -4.18E-03 -1.92E-04 3.67E-05 -8.73E-07 -9.48E-10 0.00E+00 0.00E+00
18 6.47 -3.47E-03 2.41E-04 -1.35E-05 8.16E-07 1.40E-10 0.00E+00 0.00E+00
19 -90.00 -4.43E-03 2.40E-04 -4.75E-05 2.02E-06 -7.81E-09 0.00E+00 0.00E+00
20 -17.87 -1.20E-03 -3.33E-04 1.68E-05 -2.50E-07 2.67E-09 0.00E+00 0.00E+00
TABLE 7
As shown in fig. 3-4 and tables 5 to 7, the zoom lens of the present embodiment can support a resolution of 4K (8 MP) or more, can reach a wide-angle end view range of 120 ° or more, has a magnification variation range from the wide-angle end to the telephoto end of about 3 times, can meet the requirements of miniaturization of the lens, can reduce design and production costs while guaranteeing resolution, and can meet the temperature range of-40 ℃ to 80 ℃ without virtual focus, can correct chromatic aberration of the zoom lens, and can make visible light and infrared light confocal, and the single-component product and assembly tolerance are good.
Example III
As shown in fig. 5 and 6, in the third embodiment, the WIDE-angle end focal length fw=3.50 mm, the telephoto end focal length ft=10.20 mm, the aperture coefficient FNO (WIDE) =1.66, the curvature radius R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the zoom lens are referred to in the following table (table 8):
TABLE 8
In Table 8, the values of D1, D2 and D3 are shown in the following Table (Table 9)
Wide angle end Telescope end
D1 11.32 2.15
D2 8.34 0.50
D3 2.24 10.08
TABLE 9
In embodiment three, the K value and aspherical coefficient of the zoom lens are shown in the following table (table 10):
table 10
5-6 and the above tables 8-10 show that the zoom lens of this embodiment can support a resolution of 4K (8 MP) or more, can reach a wide-angle end view range of 120 DEG or more, has a magnification variation range of about 3 times from the wide-angle end to the telephoto end, can meet the requirements of miniaturization of the lens, can reduce design and production costs while guaranteeing resolution, can meet the requirement of-40-80 ℃ temperature range without virtual focus, can correct chromatic aberration of the zoom lens, and can make visible light and infrared light confocal, and single-component products and assembly tolerances are good
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (19)

1. A zoom lens sequentially composed of a compensation lens group having negative optical power, a Stop (STO) and a zoom lens group having positive optical power in a direction from an object side to an image side along an optical axis, the compensation lens group and the zoom lens group being movable along the optical axis, the compensation lens group sequentially composed of a first lens (L1), a second lens (L2) and a third lens (L3), the zoom lens group sequentially composed of a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a ninth lens (L9) and a tenth lens (L10),
the fifth lens (L5) is a concave lens in a paraxial region, the eighth lens (L8) is a concave lens, and the sixth lens (L6) is a convex-concave lens in a paraxial region;
the moving distance T1 of the compensation lens group and the moving distance T2 of the variable magnification lens group meet the following relation: T1/T2 is more than or equal to 0.92 and less than or equal to 1.65.
2. Zoom lens according to claim 1, characterized in that the first lens (L1) and the second lens (L2) have negative optical power and the third lens (L3) has positive optical power.
3. Zoom lens according to claim 1, wherein the first lens (L1) is a convex-concave type lens, the second lens (L2) is a paraxial region concave-concave type lens, and the third lens (L3) is a paraxial region convex-convex type lens.
4. The zoom lens according to claim 1, wherein the first lens (L1) is a glass lens, and the second lens (L2) and the third lens (L3) are plastic lenses.
5. Zoom lens according to claim 1, characterized in that the first lens (L1) is a spherical lens, and the second lens (L2) and the third lens (L3) are aspherical lenses.
6. The zoom lens according to claim 1, wherein the fourth lens (L4), the sixth lens (L6), the seventh lens (L7), and the ninth lens (L9) have positive optical power, and the fifth lens (L5), the eighth lens (L8), and the tenth lens (L10) have negative optical power.
7. Zoom lens according to claim 1, wherein the fourth lens (L4) and the seventh lens (L7) are convex-convex lenses, the tenth lens (L10) is a paraxial region convex-concave lens, and the ninth lens (L9) is a paraxial region convex-concave lens or a paraxial region convex-convex lens.
8. The zoom lens according to claim 1, wherein the fourth lens (L4), the seventh lens (L7), and the eighth lens (L8) are glass lenses, and the fifth lens (L5), the sixth lens (L6), the ninth lens (L9), and the tenth lens (L10) are plastic lenses.
9. The zoom lens according to claim 1, wherein the fourth lens (L4), the seventh lens (L7), and the eighth lens (L8) are spherical lenses, and the fifth lens (L5), the sixth lens (L6), and the tenth lens (L10) are aspherical lenses.
10. Zoom lens according to any of claims 1-9, characterized in that the seventh lens (L7) and the eighth lens (L8) constitute a double cemented lens.
11. The zoom lens according to claim 10, wherein a focal length FA of the cemented doublet and a focal length F2 of the variable magnification lens group satisfy the following relationship: FA/F2 of 7.53 or less or 25.86 or less.
12. The zoom lens according to any one of claims 1 to 9, wherein a focal length F1 of the compensation lens group and a wide-angle end focal length Fw of the zoom lens satisfy the following relationship: -2.83 < F1/Fw < 2.39;
the focal length F1 of the compensation lens group and the focal length Ft of the telescopic end of the zoom lens satisfy the following relationship: F1/Ft is less than or equal to-0.94 and less than or equal to-0.80.
13. The zoom lens according to any one of claims 1 to 9, wherein a focal length F2 of the variable magnification lens group and a wide-angle end focal length Fw of the zoom lens satisfy the following relationship: F2/Fw is more than or equal to 2.75 and less than or equal to 3.01;
the focal length F2 of the zoom lens group and the focal length Ft of the telescopic end of the zoom lens satisfy the following relationship: F2/Ft is more than or equal to 0.97 and less than or equal to 1.03.
14. The zoom lens according to any one of claims 1 to 9, wherein a wide-angle end focal length Fw of the zoom lens and an optical total length TTL of the zoom lens at the wide-angle end satisfy the following relationship: fw/TTL is more than or equal to 0.06 and less than or equal to 0.08;
the following relationship is satisfied between the focal length Ft of the telephoto end of the zoom lens and the total optical length TTL of the wide-angle end of the zoom lens: ft/TTL is more than or equal to 0.20 and less than or equal to 0.22.
15. A zoom lens according to any one of claims 1-9, wherein the refractive index n1 of the first lens (L1) satisfies the following relationship: n1 is more than or equal to 1.70 and less than or equal to 1.83;
the Abbe number vd1 of the first lens (L1) satisfies the following relationship: and (3) vd1 is more than or equal to 43.90 and 57.40.
16. Zoom lens according to any of claims 1-9, wherein the refractive index n7 of the seventh lens (L7) satisfies the following relation: n7 is more than or equal to 1.43 and less than or equal to 1.47;
the abbe number vd7 of the seventh lens (L7) satisfies the following relationship: 88.56 vd7 is less than or equal to 96.74.
17. Zoom lens according to any of claims 1-9, wherein the refractive index n8 of the eighth lens (L8) satisfies the following relationship: n8 is more than or equal to 1.65 and less than or equal to 1.85;
the Abbe number vd8 of the eighth lens (L8) satisfies the following relationship: 23.30.ltoreq.vd8.ltoreq. 34.30.
18. The zoom lens according to any one of claims 1 to 9, wherein the object-side radius of curvature R1 and the image-side radius of curvature R2 of the first lens (L1) satisfy the following relationship: R1/R2 is more than or equal to 6.51 and less than or equal to 20.05.
19. Zoom lens according to any of claims 1-9, further comprising a parallel plate (CG) and an image plane (IMA) behind the variable magnification lens group in the object-side to image-side direction.
CN202210962867.XA 2022-08-11 2022-08-11 Zoom lens Active CN115128785B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013083780A (en) * 2011-10-07 2013-05-09 Nikon Corp Optical system, optical device, and method for manufacturing optical system
CN105319692A (en) * 2014-05-26 2016-02-10 韩华泰科株式会社 Zoom lens system
CN105467566A (en) * 2016-01-07 2016-04-06 东莞市宇瞳光学科技股份有限公司 Large-aperture wide-angle zoom lens
CN107422460A (en) * 2017-09-15 2017-12-01 东莞市宇瞳光学科技股份有限公司 The small-sized big target surface zoom lens of ultra-wide angle
TW202219581A (en) * 2020-11-04 2022-05-16 財團法人國家實驗研究院 Optical imaging capturing lens assembly and electronic imaging capturing device containing the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI610094B (en) * 2014-10-07 2018-01-01 揚明光學股份有限公司 Zoom lens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013083780A (en) * 2011-10-07 2013-05-09 Nikon Corp Optical system, optical device, and method for manufacturing optical system
CN105319692A (en) * 2014-05-26 2016-02-10 韩华泰科株式会社 Zoom lens system
CN105467566A (en) * 2016-01-07 2016-04-06 东莞市宇瞳光学科技股份有限公司 Large-aperture wide-angle zoom lens
CN107422460A (en) * 2017-09-15 2017-12-01 东莞市宇瞳光学科技股份有限公司 The small-sized big target surface zoom lens of ultra-wide angle
TW202219581A (en) * 2020-11-04 2022-05-16 財團法人國家實驗研究院 Optical imaging capturing lens assembly and electronic imaging capturing device containing the same

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