CN218585087U - Zoom lens - Google Patents
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- CN218585087U CN218585087U CN202222547905.3U CN202222547905U CN218585087U CN 218585087 U CN218585087 U CN 218585087U CN 202222547905 U CN202222547905 U CN 202222547905U CN 218585087 U CN218585087 U CN 218585087U
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Abstract
The utility model relates to a zoom lens, along the direction of optical axis from the thing side to picture side, in proper order including compensation lens group, the diaphragm that has negative focal power, the first fixed lens group that has positive focal power, the variable power lens group that has positive focal power and the fixed lens group of second that has positive focal power, compensation lens group with the variable power lens group is followed the optical axis is portable, first fixed lens group includes fourth lens and fifth lens in proper order. Through reasonable lens configuration, the zoom ratio of 2.4 times of that of the zoom lens can be realized, the confocal condition of visible light and infrared light is met, and the maximum aperture of 1.05 can be realized in the zooming process.
Description
Technical Field
The utility model relates to an imaging lens, concretely relates to zoom lens.
Background
The zoom lens has the characteristic of variable focal length, can meet the requirements of various monitoring scenes, is widely concerned in the markets of security monitoring and intelligent transportation, and has higher requirements on the image acquisition function of the lens. The zoom lens with a powerful image acquisition function needs to ensure that large aperture zooming is realized within a full focal length range under the condition of meeting the requirement of a high-resolution large target surface. The lens with the characteristics has a wide application prospect, and the problem of high manufacturing cost needs to be considered. However, the zoom lens in the related art cannot satisfy the above requirements.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a zoom lens to solve the above problems, which can achieve a zoom ratio of 2.4 times that of the zoom lens, satisfy the confocal condition of visible light and infrared light, and achieve a maximum aperture of 1.05 during the zoom process.
The embodiment of the utility model provides a zoom lens, along the direction of optical axis from the thing side to image side, include compensation lens group, the diaphragm that has negative focal power, the first fixed lens group that has positive focal power, the variable power lens group that has positive focal power and the fixed lens group of second that has positive focal power in proper order, compensation lens group with the variable power lens group is followed the optical axis is portable, first fixed lens group includes fourth lens and fifth lens in proper order.
Preferably, the compensation lens group includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, and a third lens, and the first lens, the second lens, and the third lens each have negative power.
Preferably, in a direction from the object side to the image side along the optical axis, the first lens is a convex-concave lens, the second lens is a concave-concave lens, and the third lens is a concave-concave lens or a convex-concave lens.
Preferably, the fourth lens has a negative optical power, and the fifth lens has a positive optical power.
Preferably, the fourth lens is a concave-concave lens or a convex-concave lens, and the fifth lens is a convex-convex lens or a convex-concave lens or a convex-flat lens in a direction from the object side to the image side along the optical axis.
Preferably, the variable power lens group includes, in order from the object side to the image side along an optical axis, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, the sixth lens, the eighth lens, and the tenth lens having positive power, and the seventh lens and the ninth lens having negative power.
Preferably, in a direction from the object side to the image side along the optical axis, the sixth lens and the tenth lens are convex-convex lenses, the seventh lens is a concave-concave lens or a convex-concave lens or a plano-concave lens, the eighth lens is a convex-convex lens, and the ninth lens is a convex-concave lens.
Preferably, the second fixed lens group includes, in order in a direction from the object side to the image side along the optical axis, an eleventh lens having negative power, a twelfth lens having positive power, a thirteenth lens having negative power, a fourteenth lens having positive power, and a fifteenth lens.
Preferably, in a direction from the object side to the image side along the optical axis, the eleventh lens and the thirteenth lens are concave-concave lenses, the twelfth lens and the fourteenth lens are convex-convex lenses, and the fifteenth lens is a concave-concave lens or a convex-convex lens.
Preferably, the second fixed lens group further includes a sixteenth lens that is a convex-concave lens or a concave-concave lens located after the fifteenth lens in a direction from the object side to the image side along an optical axis.
Preferably, the variable power lens group includes at least one cemented lens.
Preferably, a focal length Fa of the cemented lens and a focal length F3 of the variable power lens group satisfy the following relationship: fa/F3 is more than or equal to 2.91 and less than or equal to 5.96.
Preferably, the zoom lens includes at least two aspheric lenses, and at least one of the at least two aspheric lenses is made of glass.
Preferably, a moving distance T1 of the compensation lens group and a moving distance T2 of the variable magnification lens group satisfy the following relationship: T1/T2 is more than or equal to 1.36 and less than or equal to 2.05.
Preferably, a focal length F1 of the compensation lens group and a focal length F3 of the variable magnification lens group satisfy the following relationship: F1/F3 is more than or equal to-0.79 and less than or equal to-0.62.
Preferably, a focal length F6 of the sixth lens and a focal length F3 of the variable power lens group satisfy the following conditional expression: F6/F3 is more than or equal to 1.76 and less than or equal to 1.89.
Preferably, a focal length F8 of the eighth lens and a focal length F3 of the variable power lens group satisfy the following conditional expression: F8/F3 is more than or equal to 1.48 and less than or equal to 1.60.
According to the utility model discloses a scheme can realize the zoom ratio of about 2.4 times of zoom.
According to the utility model discloses a scheme, zoom in-process zoom camera lens has faster response speed.
According to the utility model discloses a scheme can realize that zoom's visible light is confocal with the infrared light.
According to the utility model discloses a scheme, the maximum light ring 1.05 can be realized to the variation of times in-process.
According to the utility model discloses a scheme is favorable to realizing zoom's miniaturization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic optical structure diagram of a zoom lens according to a first embodiment of the present invention;
fig. 2 is an optical schematic diagram of a zoom lens according to a second embodiment of the present invention;
fig. 3 is a schematic view of an optical structure of a zoom lens according to a third embodiment of the present invention;
fig. 4 is a schematic view of an optical structure of a zoom lens according to a fourth embodiment of the present invention;
fig. 5 is an optical structure diagram of a zoom lens according to a fifth embodiment of the present invention.
Detailed Description
The description of the embodiments of this specification is intended to be taken in conjunction with the accompanying drawings, which are to be considered part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified or conveniently indicated. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are well known to those skilled in the art.
Any reference to directions and orientations to the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the present invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the appended claims.
As shown in fig. 1-5, an embodiment of the present invention provides a zoom lens, which includes, in order from an object side to an image side along an optical axis, a compensation lens group G1 having negative power, a stop STO, a first fixed lens group G2 having positive power, a variable power lens group G3 having positive power, a second fixed lens group G4 having positive power, a slab CG and an image plane IMA, wherein the compensation lens group G1 and the variable power lens group G3 are movable along the optical axis, and the first fixed lens group G2 includes, in order, a fourth lens L4 and a fifth lens L5. Through reasonable lens configuration, the zoom ratio of about 2.4 times can be realized, the confocal of visible light and infrared light is simultaneously satisfied, and the maximum aperture of 1.05 can be realized in the zoom process.
In some preferred embodiments of the present invention, the compensation lens group G1 includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, and a third lens L3. Wherein the first lens L1 is a convex-concave lens having a negative power, the second lens L2 is a concave-concave lens having a negative power, and the third lens is a concave-concave or convex-concave lens having a negative power.
In some preferred embodiments of the present invention, the fourth lens L4 is a concave-concave or convex-concave lens having a negative power, and the fifth lens L5 is a convex-convex lens or convex-concave lens or convex-flat lens having a positive power, in a direction from the object side to the image side along the optical axis.
In some preferred embodiments of the present invention, the variable power lens group G3 includes, in order from the object side to the image side along the optical axis, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10, the sixth lens L6 being a convex-convex lens having positive power, the seventh lens L7 being a concave-concave lens or a convex-concave lens or a plano-concave lens having negative power, the eighth lens L8 being a convex-convex lens having positive power, the ninth lens L9 being a convex-concave lens having negative power, and the tenth lens L10 being a convex-convex lens having positive power.
In some preferred embodiments of the present invention, the second fixed lens group G4 includes, in order from the object side to the image side along the optical axis, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, and a fifteenth lens L15. Among them, the eleventh lens L11 is a concave-concave lens having a negative power, the twelfth lens L12 is a convex-convex lens having a positive power, the thirteenth lens L13 is a concave-concave lens having a negative power, the fourteenth lens L14 is a convex-convex lens having a positive power, and the fifteenth lens L15 is a concave-concave lens or a convex-convex lens.
In some preferred embodiments of the present invention, the second fixed lens group G4 further includes a sixteenth lens L16 located after the fifteenth lens L15 in a direction from the object side to the image side along the optical axis, the sixteenth lens L16 being a convex-concave lens or a concave-concave lens.
Through the reasonable distribution of the focal power and the shape of each group of lenses, the zoom ratio of about 2.4 times of that of the zoom lens is favorably realized, and meanwhile, the maximum aperture of 1.05 can be realized in the zooming process.
In some preferred embodiments of the present invention, the zoom lens includes at least one cemented lens, and the focal length Fa of the cemented lens and the focal length F3 of the variable power lens group G3 satisfy: fa/F3 is more than or equal to 2.91 and less than or equal to 5.96. Therefore, the method is favorable for correcting system aberration and improving the optical performance of the zoom lens, and the zoom lens is favorable for realizing confocal of visible light and infrared light by reasonably setting the focal power of the cemented lens, and can reduce the assembly tolerance of the two lenses and improve the assembly yield of the zoom lens.
In some preferred embodiments of the present invention, the zoom lens includes at least two aspheric lenses, and at least one of the at least two aspheric lenses is made of glass. This is advantageous in improving the optical performance of the zoom lens.
In some preferred embodiments of the present invention, the moving distance T1 of the compensation lens group G1 and the moving distance T2 of the zoom lens group G3 satisfy the following relationship: T1/T2 is more than or equal to 1.36 and less than or equal to 2.05. Therefore, in the zooming process, the focusing response speed is higher, and the miniaturization of the lens can be met.
In some preferred embodiments of the present invention, the focal length F1 of the compensation lens group G1 and the focal length F3 of the variable power lens group G3 satisfy the following relationship: F1/F3 is more than or equal to-0.79 and less than or equal to-0.62. Therefore, the optical power of the two groups is reasonably distributed, so that the optical performance of the zoom lens is improved.
In some preferred embodiments of the present invention, the focal length F6 of the sixth lens L6 and the focal length F3 of the variable power lens group G3 satisfy the following conditional expression: F6/F3 is more than or equal to 1.76 and less than or equal to 1.89. The focal length F8 of the eighth lens L8 and the focal length F3 of the variable power lens group G3 satisfy the following conditional expression: F8/F3 is more than or equal to 1.48 and less than or equal to 1.60. Therefore, the focal power and the shape of the lens in the variable power lens group G3 and the focal length of the positive film are reasonably distributed, so that the zoom lens is favorable for realizing the zooming of visible light and infrared light.
Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has: (1) the zoom ratio of about 2.4 times of that of the zoom lens can be realized; (2) the zoom lens has a faster response speed in the zooming process; (3) the confocal of visible light and infrared light of the zoom lens can be realized; (4) the maximum aperture can be 1.05 in the zooming process; (5) the zoom lens is advantageous for miniaturization.
The zoom lens of the present invention will be specifically described below with reference to five embodiments in conjunction with the accompanying drawings and tables. In the following embodiments, the stop STO is described as one surface, and the image surface IMA is described as one surface.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
| conditional formula (II) | Example one | Example two | EXAMPLE III | Example four | EXAMPLE five |
| 2.91≤Fa/F3≤5.96 | 3.582 | 3.351 | 5.519 | 3.728 | 4.796 |
| 1.36≤T1/T2≤2.05 | 1.604 | 1.458 | 1.851 | 1.926 | 1.948 |
| -0.79≤F1/F3≤-0.62 | -0.712 | -0.650 | -0.714 | -0.750 | -0.763 |
| 1.76≤f6/F3≤1.89 | 1.797 | 1.811 | 1.866 | 1.786 | 1.869 |
| 1.48≤f8/F3≤1.60 | 1.533 | 1.539 | 1.534 | 1.498 | 1.579 |
TABLE 1
In an embodiment of the present invention, the aspheric 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 where the height perpendicular to the optical axis is y along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. The 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
Example one
As shown in fig. 1, in the first embodiment, the zoom lens has a wide-angle end focal length fw =6.70mm and a telephoto end focal length ft =16.04mm.
In the first embodiment, the first lens L1 is a convex-concave glass spherical lens with negative power, the second lens L2 is a concave-concave glass spherical lens with negative power, the third lens L3 is a concave-concave glass spherical lens with negative power, the fourth lens L4 is a paraxial region concave-concave glass aspherical lens with negative power, the fifth lens L5 is a convex-convex glass spherical lens with positive power, the sixth lens L6 is a paraxial region convex-convex glass aspherical lens with positive power, the seventh lens L7 is a concave-concave glass spherical lens with negative power, the eighth lens L8 is a convex-convex glass spherical lens with positive power, the ninth lens L9 is a convex-concave glass spherical lens with negative power, the tenth lens L10 is a convex-convex glass spherical lens with positive power, and the ninth lens L9 and the tenth lens L10 form a cemented lens set, the eleventh lens L11 is a glass spherical lens with negative power, the twelfth lens L12 is a convex-concave glass spherical lens with positive power, the fourteenth lens L14 is a positive convex-concave glass spherical lens, the fourteenth lens L14 is a positive concave-convex glass spherical lens, the fourteenth lens L14 is a positive concave glass spherical lens, the fourteenth lens is a positive concave glass spherical lens and the fourteenth lens set
The curvature radius R, thickness d, refractive index Nd, and abbe number Vd of each surface of the zoom lens are as follows (table 2):
| number of noodles | Surface type | Radius of curvature R | Thickness d | Refractive index Nd | Abbe number Vd |
| 1 | Spherical surface | 144.291 | 1.300 | 1.52 | 64.2 |
| 2 | Spherical surface | 17.635 | 6.987 | ||
| 3 | Spherical surface | -67.438 | 1.100 | 1.49 | 70.4 |
| 4 | Spherical surface | 61.258 | 3.918 | ||
| 5 | Spherical surface | -26.288 | 1.100 | 1.49 | 70.4 |
| 6 | Spherical surface | 4496.427 | D1 | ||
| 7(STO) | Spherical surface | Infinity | 2.600 | ||
| 8 | Aspherical surface | -184.062 | 1.600 | 1.69 | 31.1 |
| 9 | Aspherical surface | 86.625 | 0.100 | ||
| 10 | Spherical surface | 65.599 | 2.542 | 1.95 | 18.0 |
| 11 | Spherical surface | -161.806 | D2 | ||
| 12 | Aspherical surface | 29.711 | 5.192 | 1.50 | 81.6 |
| 13 | Aspherical surface | -43.609 | 1.059 | ||
| 14 | Spherical surface | -149.285 | 1.000 | 1.61 | 44.1 |
| 15 | Spherical surface | 64.966 | 0.100 | ||
| 16 | Spherical surface | 34.934 | 8.157 | 1.55 | 75.5 |
| 17 | Spherical surface | -30.674 | 0.100 | ||
| 18 | Spherical surface | 34.018 | 1.000 | 1.80 | 30.9 |
| 19 | Spherical surface | 15.226 | 8.629 | 1.44 | 95.1 |
| 20 | Spherical surface | -30.851 | D3 | ||
| 21 | Spherical surface | -767.746 | 0.800 | 1.81 | 22.8 |
| 22 | Spherical surface | 15.495 | 2.300 | ||
| 23 | Aspherical surface | 24.292 | 4.602 | 1.77 | 49.6 |
| 24 | Aspherical surface | -20.664 | 0.100 | ||
| 25 | Spherical surface | -22.040 | 0.801 | 1.68 | 26.8 |
| 26 | Spherical surface | 14.479 | 4.259 | 2.00 | 19.3 |
| 27 | Spherical surface | -34.910 | 0.100 | ||
| 28 | Spherical surface | -48.091 | 0.800 | 1.87 | 20.0 |
| 29 | Spherical surface | 69.464 | 3.071 | ||
| 30 | Spherical surface | Infinity | 0.700 | 1.52 | 64.2 |
| 31 | Spherical surface | Infinity | 2.600 | ||
| 32(IMA) | Spherical surface | Infinity | - |
TABLE 2
In the first embodiment, the K value and aspheric coefficient of the zoom lens are shown in the following table (table 3):
| noodle sequence number | Value of K | A4 | A6 | A8 | A10 | | A14 | A16 | |
| 8 | 0.000 | -1.70E-05 | 1.55E-08 | 3.69E-10 | -1.22E-12 | -5.58E-26 | -5.80E-31 | -5.88E-35 | |
| 9 | 0.000 | -1.44E-05 | 2.81E-08 | 2.71E-10 | -1.19E-12 | 1.37E-25 | 6.30E-31 | -9.57E-35 | |
| 12 | -2.486 | -2.87E-06 | 7.24E-08 | -2.24E-10 | 1.92E-12 | -1.07E-14 | -9.64E-30 | -2.34E-34 | |
| 13 | -3.119 | 3.13E-05 | 6.58E-08 | 1.06E-10 | 7.06E-13 | -8.44E-15 | 7.73E-30 | 2.34E-36 | |
| 23 | 2.477 | -3.09E-05 | 4.21E-08 | -1.98E-09 | 4.59E-12 | -5.05E-28 | -1.48E-31 | -3.58E-35 | |
| 24 | 2.818 | 5.41E-05 | 5.25E-07 | -6.17E-09 | 7.08E-11 | 2.77E-28 | -1.00E-31 | -3.58E-35 |
TABLE 3
In the first embodiment, when the wide angle end of the zoom lens is changed to the telephoto end, the variable interval values (i.e., D1, D2, and D3 in table 2) are as follows (table 4):
| wide angle end | Telescope end | |
| D1 | 18.767 | 1.100 |
| D2 | 12.216 | 1.200 |
| D3 | 2.400 | 13.416 |
TABLE 4
With reference to fig. 1 and tables 1-4, in the present embodiment, by reasonably distributing the lens optical parameters of each lens group, the zoom ratio of 2.4 times of that of the zoom lens can be realized, the confocal of visible light and infrared light is satisfied, and the maximum aperture of 1.05 can be realized in the zoom process.
Example two
As shown in fig. 2, in the second embodiment, the zoom lens has a wide-angle end focal length fw =6.55mm and a telephoto end focal length ft =15.66mm.
In example two, the first lens L1 is a convex-concave glass spherical lens with negative power, the second lens L2 is a concave-concave glass spherical lens with negative power, the third lens L3 is a concave-concave glass spherical lens with negative power, the fourth lens L4 is a paraxial region convex-concave glass spherical lens with negative power, the fifth lens L5 is a convex-convex glass spherical lens with positive power, the sixth lens L6 is a paraxial region convex-convex glass spherical lens with positive power, the seventh lens L7 is a concave-concave glass spherical lens with negative power, the eighth lens L8 is a convex-convex glass spherical lens with positive power, the ninth lens L9 is a convex-concave glass spherical lens with negative power, the tenth lens L10 is a convex-convex glass spherical lens with positive power, and the ninth lens L9 and the tenth lens L10 form a cemented lens set, the eleventh lens L11 is a convex-concave glass spherical lens with negative power, the twelfth lens L12 is a convex-convex glass spherical lens with positive power, the ninth lens L14 is a convex-concave glass spherical lens with positive power, the fourteenth lens L14 is a convex glass spherical lens with positive power, the fourteenth lens L14 is a cemented lens with positive glass spherical lens, the fourteenth lens and the fourteenth lens is a cemented lens set of a positive glass spherical lens.
The curvature radius R, thickness d, refractive index Nd, and abbe number Vd of each surface of the zoom lens are shown in the following table (table 5):
TABLE 5
In the second embodiment, the K value and the aspherical surface coefficient of the zoom lens are shown in the following table (table 6):
| number of noodles | Value of K | A4 | A6 | A8 | A10 | | A14 | A16 | |
| 8 | 0.000 | -7.43E-05 | 3.04E-07 | -1.01E-09 | 2.06E-12 | -8.63E-23 | -2.16E-26 | 0.00E+00 | |
| 9 | 0.000 | -7.33E-05 | 3.20E-07 | -1.10E-09 | 2.06E-12 | -8.79E-23 | -2.11E-26 | 0.00E+00 | |
| 12 | -3.686 | -4.09E-06 | 9.03E-08 | -6.35E-10 | 3.18E-12 | -1.63E-14 | -2.13E-26 | 0.00E+00 | |
| 13 | -4.284 | 2.92E-05 | 6.76E-08 | 7.16E-11 | -8.76E-13 | -6.09E-15 | -2.11E-26 | 0.00E+00 | |
| 29 | 0.008 | -2.58E-05 | -9.96E-08 | 1.03E-09 | -1.21E-11 | -3.57E-26 | -6.57E-30 | 0.00E+00 | |
| 30 | 0.000 | -5.78E-05 | -2.40E-07 | 8.63E-10 | -1.61E-12 | -3.10E-26 | -6.51E-30 | 0.00E+00 |
TABLE 6
In embodiment two, when the wide angle end of the zoom lens is changed to the telephoto end, the variable interval values (i.e., D1, D2, and D3 in table 5) are referred to the following table (table 7):
| wide angle end | Telescope end | |
| D1 | 17.416 | 1.100 |
| D2 | 12.387 | 1.200 |
| D3 | 2.400 | 13.587 |
TABLE 7
With reference to fig. 2 and tables 1 and 5-7, in this embodiment, by reasonably distributing the optical parameters of the lenses of the lens groups, the zoom ratio of 2.4 times of the zoom lens can be realized, the confocal condition of visible light and infrared light is satisfied, and the maximum aperture of 1.05 can be realized in the zooming process.
EXAMPLE III
As shown in fig. 3, in the third embodiment, the zoom lens has a wide-angle end focal length fw =6.32mm and a telephoto end focal length ft =15.12mm.
In example three, the first lens L1 is a convex-concave glass spherical lens with negative power, the second lens L2 is a concave-concave glass spherical lens with negative power, the third lens L3 is a concave-concave glass spherical lens with negative power, the fourth lens L4 is a paraxial region convex-concave aspheric lens with negative power, the fifth lens L5 is a convex-convex glass spherical lens with positive power, the sixth lens L6 is a paraxial region convex-convex glass spherical lens with positive power, the seventh lens L7 is a convex-concave glass spherical lens with negative power, the eighth lens L8 is a convex-convex glass spherical lens with positive power, the ninth lens L9 is a concave-convex glass spherical lens with negative power, the tenth lens L10 is a convex-convex glass spherical lens with positive power, and the ninth lens L9 and the tenth lens L10 constitute a cemented lens group, the eleventh lens L11 is a concave-convex glass spherical lens with negative power, the twelfth lens L12 is a convex-convex glass spherical lens with positive power, the ninth lens L14 is a positive convex-convex glass spherical lens, the fourteenth lens L14 is a positive convex-convex glass spherical lens with positive power, and the fourteenth lens is a positive convex-convex glass spherical lens.
The curvature radius R, thickness d, refractive index Nd, and abbe number Vd of each surface of the zoom lens are as follows (table 8):
TABLE 8
In embodiment three, the K value and aspheric coefficient of the zoom lens are as follows (table 9):
| number of noodles | Value of K | A4 | A6 | A8 | A10 | | A14 | A16 | |
| 8 | 0.000 | -1.07E-04 | 4.18E-07 | -1.12E-09 | 5.49E-13 | 0.00E+00 | 0.00E+00 | 0.00E+00 | |
| 9 | 0.000 | -1.03E-04 | 4.59E-07 | -1.51E-09 | 1.95E-12 | 0.00E+00 | 0.00E+00 | 0.00E+00 | |
| 12 | -2.702 | -5.60E-06 | 6.30E-08 | -1.92E-10 | 1.08E-12 | -1.37E-14 | 0.00E+00 | 0.00E+00 | |
| 13 | -4.793 | 2.91E-05 | 4.37E-08 | 3.93E-10 | -2.09E-12 | -5.62E-15 | 0.00E+00 | 0.00E+00 | |
| 29 | -274.216 | -9.11E-05 | -2.59E-06 | 2.83E-08 | -1.71E-10 | 0.00E+00 | 0.00E+00 | 0.00E+00 | |
| 30 | 0.000 | -2.25E-04 | -6.76E-07 | 1.45E-08 | -1.02E-10 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
TABLE 6
In the third embodiment, when the wide angle end of the zoom lens is changed to the telephoto end, the variable interval values (i.e., D1, D2, and D3 in table 8) are as follows (table 10):
| wide angle end | Telescope end | |
| D1 | 19.783 | 1.537 |
| D2 | 10.856 | 1.000 |
| D3 | 1.100 | 10.956 |
Watch 10
With reference to fig. 3 and tables 1 and 8-10, in the present embodiment, by reasonably distributing the lens optical parameters of each lens group, the zoom ratio of 2.4 times of that of the zoom lens can be realized, the confocal property of visible light and infrared light is satisfied, and the maximum aperture can be realized by 1.05 during the zooming process.
Example four
As shown in fig. 4, in the fourth embodiment, the zoom lens has a wide-angle end focal length fw =6.61mm and a telephoto end focal length ft =15.81mm.
In example four, the first lens L1 is a convex-concave glass spherical lens with negative power, the second lens L2 is a concave-concave glass spherical lens with negative power, the third lens L3 is a concave-convex glass spherical lens with negative power, the fourth lens L4 is a concave-concave glass spherical lens with negative power, the fifth lens L5 is a convex-concave glass spherical lens with positive power, the sixth lens L6 is a paraxial region convex-convex glass aspherical lens with positive power, the seventh lens L7 is a concave-concave glass spherical lens with negative power, the eighth lens L8 is a convex-convex glass spherical lens with positive power, the ninth lens L9 is a concave-convex glass spherical lens with negative power, the tenth lens L10 is a convex-convex glass spherical lens with positive power, and the ninth lens L9 and the tenth lens L10 constitute a cemented lens group, the eleventh lens L11 is a concave-convex glass spherical lens with negative power, the twelfth lens L12 is a convex-convex glass spherical lens with positive power, the ninth lens L13 is a positive convex-concave glass spherical lens, the fourteenth lens L14 is a positive convex-convex glass spherical lens with positive power, and the fourteenth lens is a positive convex glass spherical lens with positive power.
The curvature radius R, thickness d, refractive index Nd, and abbe number Vd of each surface of the zoom lens are shown in the following table (table 11):
TABLE 11
In embodiment four, the K value and aspheric coefficient of the zoom lens are as follows (table 12):
| number of noodles | Value of K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 12 | -2.174 | -4.16E-06 | 5.88E-08 | -2.37E-10 | 1.46E-12 | -1.37E-14 | 0.00E+00 | 0.00E+00 |
| 13 | -6.795 | 3.07E-05 | 3.65E-08 | 3.11E-10 | -1.72E-12 | -5.62E-15 | 0.00E+00 | 0.00E+00 |
| 29 | -150.000 | -3.51E-05 | -1.25E-06 | 1.18E-08 | -8.66E-11 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 30 | 0.000 | -1.37E-04 | -4.26E-08 | 2.07E-09 | -3.61E-11 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
TABLE 12
In the fourth embodiment, when the wide angle end of the zoom lens is changed to the telephoto end, the variable interval values (i.e., D1, D2, and D3 in table 11) are referred to the following table (table 13):
| wide angle end | The telescope end | |
| D1 | 20.516 | 1.500 |
| D2 | 10.973 | 1.102 |
| D3 | 1.100 | 10.971 |
Watch 13
With reference to fig. 4 and tables 1 and 11-13, in the present embodiment, by reasonably distributing the lens optical parameters of each lens group, the zoom ratio of 2.4 times of the zoom lens can be realized, the confocal property of visible light and infrared light is satisfied, and the maximum aperture of 1.05 can be realized during the zooming process.
EXAMPLE five
As shown in fig. 5, in the fifth embodiment, the wide-angle end focal length fw =6.35mm and the telephoto end focal length ft =15.18mm of the zoom lens.
In example v, the first lens L1 is a convex-concave glass spherical lens with negative power, the second lens L2 is a concave-concave glass spherical lens with negative power, the third lens L3 is a concave-convex glass spherical lens with negative power, the fourth lens L4 is a paraxial region concave-concave aspherical lens with negative power, the fifth lens L5 is a paraxial region convex-concave aspherical lens with positive power, the sixth lens L6 is a paraxial region convex-convex glass spherical lens with positive power, the seventh lens L7 is a convex-concave glass spherical lens with negative power, the eighth lens L8 is a convex-convex glass spherical lens with positive power, the ninth lens L9 is a convex-concave glass spherical lens with negative power, the tenth lens L10 is a convex-convex glass spherical lens with positive power, and the ninth lens L9 and the tenth lens L10 constitute a cemented lens set, the eleventh lens L11 is a concave glass spherical lens with negative power, the twelfth lens L12 is a convex-convex glass spherical lens with positive power, the ninth lens L14 is a positive glass spherical lens, the fourteenth lens L14 is a positive convex-convex glass spherical lens with positive power, and the fourteenth lens is a positive glass spherical convex-convex spherical lens.
The curvature radius R, thickness d, refractive index Nd, and abbe number Vd of each surface of the zoom lens are as follows (table 14):
TABLE 14
In embodiment five, the K value and aspheric coefficient of the zoom lens are as follows (table 15):
| noodle sequence number | Value of K | A4 | A6 | A8 | A10 | | A14 | A16 | |
| 8 | 0.000 | -3.45E-06 | -3.57E-08 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | |
| 9 | 0.000 | -1.24E-05 | -4.51E-08 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | |
| 10 | 0.000 | -1.52E-05 | -1.56E-08 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | |
| 11 | 0.000 | -7.51E-06 | -1.16E-08 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | |
| 12 | -3.037 | -5.81E-06 | 7.41E-08 | -2.45E-10 | 1.33E-12 | -1.37E-14 | 0.00E+00 | 0.00E+00 | |
| 13 | -4.585 | 3.04E-05 | 5.81E-08 | 4.08E-10 | -1.94E-12 | -5.62E-15 | 0.00E+00 | 0.00E+00 | |
| 23 | -150.00 | -5.04E-05 | -1.80E-06 | -1.58E-08 | -9.15E-11 | 0.00E+00 | 0.00E+00 | 0.00E+00 | |
| 24 | 0.000 | -1.67E-04 | -3.28E-07 | 6.78E-09 | -5.23E-11 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
Watch 15
In embodiment five, when the wide angle end of the zoom lens is changed to the telephoto end, the variable interval values (i.e., D1, D2, and D3 in table 11) are as follows (table 16):
| wide angle end | Telescope end | |
| D1 | 20.126 | 1.500 |
| D2 | 10.677 | 1.117 |
| D3 | 1.100 | 10.660 |
TABLE 16
With reference to fig. 5 and tables 1 and 14-16, in the present embodiment, by reasonably distributing the lens optical parameters of each lens group, the zoom ratio of 2.4 times of the zoom lens can be realized, the confocal property of visible light and infrared light is satisfied, and the maximum aperture can be realized by 1.05 during the zooming process.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. Zoom lens comprising, in order in a direction from an object side to an image side along an optical axis, a compensation lens group (G1) having negative optical power, a Stop (STO), a first fixed lens group (G2) having positive optical power, a variable power lens group (G3) having positive optical power, and a second fixed lens group (G4) having positive optical power, the compensation lens group (G1) and the variable power lens group (G3) being movable along the optical axis,
the first fixed lens group (G2) includes, in order, a fourth lens (L4) and a fifth lens (L5).
2. A zoom lens according to claim 1, wherein the compensation lens group (G1) includes, in order from the object side to the image side along the optical axis, a first lens (L1), a second lens (L2), and a third lens (L3), and the first lens (L1), the second lens (L2), and the third lens (L3) each have negative power.
3. The zoom lens according to claim 2, wherein in a direction from the object side to the image side along an optical axis, the first lens (L1) is a convex-concave lens, the second lens (L2) is a concave-concave lens, and the third lens (L3) is a concave-concave lens or a convex-concave lens.
4. The zoom lens according to claim 1, wherein the fourth lens (L4) has a negative optical power, and the fifth lens (L5) has a positive optical power.
5. The zoom lens according to claim 4, wherein the fourth lens (L4) is a concave-concave lens or a convex-concave lens, and the fifth lens (L5) is a convex-convex lens or a convex-concave lens or a convex-flat lens, in a direction from the object side to the image side along the optical axis.
6. A zoom lens according to claim 1, wherein the magnification-varying lens group (G3) includes, in order from the object side to the image side along the optical axis, a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a ninth lens (L9), and a tenth lens (L10), the sixth lens (L6), the eighth lens (L8), and the tenth lens (L10) have positive power, and the seventh lens (L7) and the ninth lens (L9) have negative power.
7. The zoom lens according to claim 6, wherein in a direction from the object side to the image side along an optical axis, the sixth lens (L6), the eighth lens (L8), and the tenth lens (L10) are convex-convex lenses, the seventh lens (L7) is a concave-concave lens or a convex-concave lens or a plano-concave lens, and the ninth lens (L9) is a convex-concave lens.
8. A zoom lens according to claim 1, wherein the second fixed lens group (G4) includes, in order from the object side to the image side along the optical axis, an eleventh lens (L11) having negative power, a twelfth lens (L12) having positive power, a thirteenth lens (L13) having negative power, a fourteenth lens (L14) having positive power, and a fifteenth lens (L15).
9. The zoom lens according to claim 8, wherein the eleventh lens (L11) and the thirteenth lens (L13) are concave-concave lenses, the twelfth lens (L12) and the fourteenth lens (L14) are convex-convex lenses, and the fifteenth lens (L15) is a concave-concave lens or a convex-convex lens in a direction from the object side to the image side along the optical axis.
10. The zoom lens according to claim 9, wherein the second fixed lens group (G4) further includes a sixteenth lens (L16) located after the fifteenth lens (L15) in a direction from the object side to the image side along an optical axis, the sixteenth lens (L16) being a convex-concave lens or a concave-concave lens.
11. A zoom lens according to any one of claims 1 to 10, wherein the variable power lens group (G3) includes at least one cemented lens.
12. A zoom lens according to claim 11, wherein a focal length Fa of the cemented lens and a focal length F3 of the variable power lens group (G3) satisfy the following relationship: fa/F3 is more than or equal to 2.91 and less than or equal to 5.96.
13. The zoom lens according to any one of claims 1 to 10, wherein the zoom lens comprises at least two aspheric lenses, and at least one of the at least two aspheric lenses is made of glass.
14. A zoom lens according to any one of claims 1 to 10, wherein a moving distance T1 of the compensation lens group (G1) and a moving distance T2 of the variable magnification lens group (G3) satisfy the following relationship: T1/T2 is more than or equal to 1.36 and less than or equal to 2.05.
15. A zoom lens according to any one of claims 1 to 10, wherein a focal length F1 of the compensation lens group (G1) and a focal length F3 of the variable power lens group (G3) satisfy the following relationship: F1/F3 is more than or equal to-0.79 and less than or equal to-0.62.
16. A zoom lens according to claim 6 or 7, wherein a focal length F6 of the sixth lens (L6) and a focal length F3 of the variable power lens group (G3) satisfy the following conditional expression: F6/F3 is more than or equal to 1.76 and less than or equal to 1.89.
17. The zoom lens according to claim 6 or 7, wherein a focal length F8 of the eighth lens (L8) and a focal length F3 of the variable power lens group (G3) satisfy the following conditional expression: F8/F3 is more than or equal to 1.48 and less than or equal to 1.60.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115480381A (en) * | 2022-09-26 | 2022-12-16 | 舜宇光学(中山)有限公司 | Zoom lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115480381A (en) * | 2022-09-26 | 2022-12-16 | 舜宇光学(中山)有限公司 | Zoom lens |
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