CN115542523A - Zoom lens - Google Patents

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Publication number
CN115542523A
CN115542523A CN202211289750.6A CN202211289750A CN115542523A CN 115542523 A CN115542523 A CN 115542523A CN 202211289750 A CN202211289750 A CN 202211289750A CN 115542523 A CN115542523 A CN 115542523A
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Prior art keywords
lens
convex
concave
zoom
lens group
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Inventor
梁伟朝
应永茂
周静
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Sunny Optics Zhongshan Co Ltd
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Sunny Optics Zhongshan Co Ltd
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Priority to CN202211289750.6A priority Critical patent/CN115542523A/en
Publication of CN115542523A publication Critical patent/CN115542523A/en
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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
    • G02B15/144—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 four groups only
    • G02B15/1445—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 four groups only the first group being negative
    • G02B15/144515—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 four groups only the first group being negative arranged -+++
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Lenses (AREA)

Abstract

The invention relates to a zoom lens, which sequentially comprises the following components in the direction from an object side to an image side along an optical axis: the zoom lens comprises a compensation lens group (G1) with negative focal power, a first fixed lens group (G2) with positive focal power, a diaphragm (STO), a zoom lens group (G3) with positive focal power, a second fixed lens group (G4) with positive focal power, a parallel flat plate (CG) and an image plane (IMA), wherein the compensation lens group (G1) and the zoom lens group (G3) can move along the optical axis; the moving distance T1 of the compensation lens group (G1) and the moving distance T2 of the variable magnification lens group (G3) satisfy the following conditional expression: T1/T2 is more than or equal to 0.54 and less than or equal to 1.62. The zoom lens can realize the zoom ratio of about 2.5 times, simultaneously meet the requirement of realizing the confocal of visible light and infrared light in the full focal length range, and can realize the maximum aperture of 1.05 in the zooming process.

Description

Zoom lens
Technical Field
The invention relates to the technical field of imaging lenses, in particular to a zoom lens.
Background
The zoom lens has the characteristic of variable focal length, and can meet the requirements of various monitoring scenes, so that the zoom lens is widely concerned and widely applied in the markets of security monitoring and intelligent transportation. With the improvement of attention, the market also has higher requirements on the image acquisition function of the zoom lens. Specifically, the zoom lens with a powerful image acquisition function needs to ensure that large-aperture zooming can be realized in a full focal length range and confocal visible light and infrared light can be realized in the full focal length range under the condition of meeting the requirement of high resolution. The zoom lens with the characteristics has a great application prospect. However, the conventional zoom lens generally cannot satisfy the above requirements.
Disclosure of Invention
In order to solve the above problems in the prior art, an object of the present invention is to provide a zoom lens, which can achieve a zoom ratio of about 2.5 times, and simultaneously satisfy the requirement of realizing confocal of visible light and infrared light in a full focal length range, and can achieve a maximum aperture of 1.05 in a zoom process.
To achieve the above object, the present invention provides a zoom lens, comprising, in order from an object side to an image side along an optical axis: the zoom lens comprises a compensation lens group with negative focal power, a first fixed lens group with positive focal power, a diaphragm, a zoom lens group with positive focal power, a second fixed lens group with positive focal power, a parallel flat plate and an image surface, wherein the compensation lens group and the zoom lens group can move along the optical axis.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis, the compensation lens group includes, in order: a first lens, a second lens, a third lens and a fourth lens,
the first lens and the fourth lens have negative optical power.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the first lens is a convex-concave lens;
the second lens is a concave-convex lens, a concave-concave lens or a convex-convex lens;
the third lens is a concave-concave lens or a convex-concave lens;
the object side surface of the fourth lens is concave in shape.
According to an aspect of the present invention, the first fixed lens group includes: a fifth lens of positive optical power.
According to an aspect of the invention, the object side surface of the fifth lens is convex in shape.
According to an aspect of the present invention, the variable power lens group includes, in order in a direction from an object side to an image side along an optical axis: a sixth lens, a seventh lens, an eighth lens, and a ninth lens,
the sixth lens and the ninth lens have positive optical power.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the sixth lens is a convex lens;
the seventh lens is a convex-convex lens, a concave-convex lens or a concave-concave lens;
the eighth lens is a concave-concave lens, a convex-concave lens or a convex-convex lens;
the ninth lens is a convex lens or a concave-convex lens.
According to an aspect of the present invention, 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 1.16 and less than or equal to 1.90.
According to an aspect of the present invention, a focal length F9 of the ninth lens and a focal length F3 of the variable power lens group satisfy the following conditional expression: F9/F3 is more than or equal to 0.99 and less than or equal to 4.48.
According to an aspect of the present invention, the variable magnification lens group further includes: a fifteenth lens located between the first fixed lens group and the sixth lens.
According to an aspect of the invention, the fifteenth lens is a convex-concave lens or a convex-convex lens in a direction from the object side to the image side along an optical axis.
According to an aspect of the present invention, the second fixed lens group includes, in order from the object side to the image side along the optical axis: a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, and a fourteenth lens,
the tenth lens, the twelfth lens, and the fourteenth lens have negative optical power, and the eleventh lens and the thirteenth lens have positive optical power.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the tenth lens and the twelfth lens are concave-concave lenses;
the eleventh lens and the thirteenth lens are convex lenses;
the fourteenth lens is a concave-concave lens, a convex-concave lens, or a meniscus lens.
According to an aspect of the present invention, the second fixed lens group further includes: a sixteenth lens of positive optical power positioned between the fourteenth lens and the parallel plate.
According to an aspect of the invention, the sixteenth lens is a convex-concave lens or a convex-convex lens in a direction from the object side to the image side along the optical axis.
According to one aspect of the present invention, the variable power lens group includes at least 1 cemented lens.
According to one aspect of the present invention, the zoom lens includes at least 2 aspheric lenses, including at least 1 glass aspheric lens.
According to an aspect of the present invention, a moving distance T1 of the compensation lens group and a moving distance T2 of the magnification-varying lens group satisfy the following conditional expression: T1/T2 is more than or equal to 0.54 and less than or equal to 1.62.
According to an aspect of the present invention, a focal length F1 of the compensation lens group and a focal length F3 of the variable magnification lens group satisfy the following conditional expression: F1/F3 is more than or equal to-0.71 and less than or equal to-0.55.
According to the scheme of the invention, the zoom optical system comprises four lens groups with negative, positive and positive focal powers, a first fixed lens group, a variable magnification lens group, a second fixed lens group, a diaphragm positioned between the first fixed lens group and the variable magnification lens group and the like, and the actuating mode among the specific lens groups and the optimized setting and combination of the number, the focal power and the shape of the lenses in each lens group not only lead the focusing response speed of the lens in the zooming process to be high, but also lead the zoom lens to realize the variable magnification ratio of about 2.5 times, simultaneously meet the confocal performance of visible light and infrared light in the full focal length range, realize the maximum aperture of 1.05 in the variable magnification process, and also consider the miniaturization design.
Drawings
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.
Fig. 1 is a schematic view of an optical system of a zoom lens according to a first embodiment of the present invention at a wide-angle end;
fig. 2 is a schematic view showing an optical system of a zoom lens according to a second embodiment of the present invention at a wide-angle end;
fig. 3 is a schematic view of an optical system of a zoom lens according to a third embodiment of the present invention at a wide-angle end;
fig. 4 schematically shows an optical system diagram at a wide-angle end of a zoom lens according to a fourth embodiment of the present invention;
fig. 5 is a schematic view showing an optical system at a wide-angle end of a zoom lens according to a fifth embodiment of the present invention;
fig. 6 schematically shows an optical system diagram at a wide-angle end of a zoom lens according to a sixth embodiment of the present invention;
fig. 7 schematically shows an optical system diagram at a wide-angle end of a zoom lens according to a seventh embodiment of the present invention.
Detailed Description
The embodiments described in this specification are to be considered in all respects as illustrative and not restrictive, and the accompanying drawings are intended to be part of the entire 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 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 invention is defined by the claims.
As shown in fig. 1, the zoom lens according to the embodiment of the present invention sequentially includes, along an optical axis from an object side to an image side: the zoom lens system comprises a compensation lens group G1, a first fixed lens group G2, a stop STO, a zoom lens group G3, a second fixed lens group G4, a parallel flat plate CG and an image plane IMA, wherein the compensation lens group G1 and the zoom lens group G3 can move along an optical axis. The compensation lens group G1 is a lens group having negative focal power, and the first fixed lens group G2, the variable power lens group G3, and the second fixed lens group G4 are all lens groups having positive focal power. Therefore, by reasonably distributing the actuating modes and the focal powers of the four lens groups, the zoom lens can realize the zoom ratio of about 2.5 times, simultaneously meet the requirement of realizing the confocal of visible light and infrared light in the full focal length range, and realize the maximum aperture of 1.05 in the zoom process.
In an embodiment of the present invention, the compensation lens group G1 sequentially includes, in a direction from the object side to the image side along the optical axis: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. Wherein the first lens L1 and the fourth lens L4 are both lenses having negative optical power. Regarding the lens shape, in the direction from the object side to the image side along the optical axis, the first lens L1 is a convex-concave lens, the second lens L2 is a concave-convex lens, a concave-concave lens, or a convex-convex lens, the third lens L3 is a concave-concave lens or a convex-concave lens, and the object-side surface of the fourth lens L4 is concave, that is, the fourth lens L4 is a concave-concave lens, a concave-flat lens, or a concave-convex lens.
In an embodiment of the present invention, the first fixed lens group G2 includes: and a fifth lens L5. The fifth lens L5 is a lens having positive optical power. Regarding the lens shape, the shape of the object-side surface of the fifth lens L5 is convex, i.e., in the direction from the object side to the image side along the optical axis, and the fifth lens L5 is a convex-concave lens, a convex-convex lens, or a convex-flat lens.
In the embodiment of the present invention, the variable power lens group G3 includes, in order along the optical axis from the object side to the image side: a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. Wherein the sixth lens L6 and the ninth lens L9 are both lenses having positive optical power. Regarding the lens shape, in a direction from the object side to the image side along the optical axis, the sixth lens L6 is a convex lens, the seventh lens L7 is a convex lens, a concave-convex lens, or a concave-concave lens, the eighth lens L8 is a concave-concave lens, a convex-concave lens, or a convex-convex lens, and the ninth lens L9 is a convex-convex lens or a concave-convex lens.
In the embodiment of the present invention, the variable power lens group G3 further includes a fifteenth lens L15, as shown in fig. 1, 4, 6 or 7. The fifteenth lens L15 is located between the first fixed lens group G2 and the sixth lens L6. Regarding the lens shape, the fifteenth lens L15 is a convex-concave lens or a convex-convex lens in a direction from the object side to the image side along the optical axis.
In the embodiment 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: a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, and a fourteenth lens L14. Among them, the tenth lens L10, the twelfth lens L12, and the fourteenth lens L14 are all lenses having negative power, and the eleventh lens L11 and the thirteenth lens L13 are all lenses having positive power. With respect to the lens shape, in the direction from the object side to the image side along the optical axis, the tenth lens L10 and the twelfth lens L12 are both concave-concave lenses, the eleventh lens L11 and the thirteenth lens L13 are both convex-convex lenses, and the fourteenth lens L14 is a concave-concave lens, a convex-concave lens, or a meniscus lens.
In the embodiment of the present invention, the second fixed lens group G4 further includes a sixteenth lens L16, as shown in fig. 1 to 5 or fig. 7. The sixteenth lens L16 is a lens having positive refractive power, and is located between the fourteenth lens L14 and the parallel plate CG. Regarding the lens shape, the sixteenth lens L16 is a convex-concave lens or a convex-convex lens in a direction from the object side to the image side along the optical axis.
According to the technical scheme of the embodiment of the invention, the number of the lenses in the four lens groups, the lens combinations with different focal powers and different shapes are reasonably distributed and optimally set, so that the zoom lens is further favorable for realizing the zoom ratio of about 2.5 times, meanwhile, the confocal of visible light and infrared light in a full focal length range is realized, and the maximum aperture of 1.05 can be realized in the zooming process.
In the embodiment of the present invention, the focal length F6 of the sixth lens element 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 1.16 and less than or equal to 1.90. The focal length F9 of the ninth lens L9 and the focal length F3 of the variable power lens group G3 satisfy the following conditional expression: F9/F3 is more than or equal to 0.99 and less than or equal to 4.48. Therefore, the focal power and the shape of each lens in the variable power lens group G3 and the focal lengths of the sixth lens L6 and the ninth lens L9 with positive focal power are reasonably distributed, so that the confocal of the zoom lens in the full focal length range can be realized.
In the embodiment of the present invention, the variable power lens group G3 at least includes 1 cemented lens. The number of the cemented lenses is reasonably set in the zoom optical system, which is beneficial to correcting the aberration of the system and improving the optical performance of the zoom lens. Meanwhile, the chromatic aberration of the system can be effectively corrected, and the zoom lens is favorable for realizing confocal of visible light and infrared light. And the assembling tolerance between the lenses can be reduced, and the assembling yield of the zoom lens can be improved.
In an embodiment of the present invention, the zoom lens includes at least 2 aspheric lenses, and at least 1 glass aspheric lens. This may be advantageous in providing optical imaging performance of the zoom lens.
In the embodiment 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 conditional expression: T1/T2 is more than or equal to 0.54 and less than or equal to 1.62. The relationship between the moving distances of the compensation lens group G1 and the variable magnification lens group G3 is limited, so that the focusing response speed of the zoom lens is high in the zooming process, and the zoom lens is miniaturized.
In the embodiment of the present invention, the focal length F1 of the compensation lens group G1 and the focal length F3 of the zoom lens group G3 satisfy the following conditional expression: F1/F3 is more than or equal to minus 0.71 and less than or equal to minus 0.55. The optical power and the focal length range of the compensation and zooming groups are reasonably distributed, so that the stability of the optical performance of the zoom lens in zooming and focusing processes is improved, the optical performance of the zoom lens is improved, and the application prospect is wider.
In summary, in the zoom lens according to the embodiment of the present invention, in the zooming or zooming process within the full focal length range, the focusing response speed is fast, the zoom ratio of about 2.5 times can be achieved, the confocal performance of the visible light and the infrared light within the full focal length range is satisfied, and the maximum aperture of 1.05 is achieved in the zooming process. The zoom lens has a miniaturized design.
The zoom lens of the present invention is specifically described below in seven embodiments with reference to the drawings and tables. In the following embodiments, the present invention designates the stop STO as one surface, the image surface IMA as one surface, and each cemented surface of the cemented lens 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
0.54≤T1/T2≤1.62 1.494 1.240 0.966 0.937
-0.71≤F1/F3≤-0.55 -0.689 -0.647 -0.649 -0.628
1.16≤f6/F3≤1.90 1.544 1.649 1.587 1.810
0.99≤f9/F3≤4.48 1.055 1.237 1.224 4.472
Conditional formula (II) EXAMPLE five EXAMPLE six EXAMPLE seven
0.54≤T1/T2≤1.62 1.041 0.965 0.665
-0.71≤F1/F3≤-0.55 -0.663 -0.642 -0.571
1.16≤f6/F3≤1.90 1.532 1.242 1.275
0.99≤f9/F3≤4.48 1.182 1.310 1.400
TABLE 1
In an embodiment of the invention, the plastic aspheric lens of the zoom lens satisfies the following formula:
Figure BDA0003900858030000071
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 a curvature at the vertex 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
The parameters of the zoom lens of the present embodiment are as follows:
wide-angle end focal length Fw =6.41mm; tele end focus Ft =16.04mm.
Table 2 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003900858030000081
Figure BDA0003900858030000091
TABLE 2
Table 3 lists aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 。
Figure BDA0003900858030000092
TABLE 3
Table 4 lists the variable interval values between the lens groups when the zoom lens of the present embodiment is changed from the wide angle end to the telephoto end.
Figure BDA0003900858030000093
Figure BDA0003900858030000101
TABLE 4
As shown in fig. 1 and tables 1 to 4, in the zoom lens of this embodiment, in the zooming or zooming process in the full focal length range, the focusing response speed is fast, the zoom ratio of about 2.5 times can be realized, the confocal performance of the visible light and the infrared light in the full focal length range is satisfied, and the maximum aperture of 1.05 is realized in the zooming process. The zoom lens has a miniaturized design.
Example two
The zoom lens of the present embodiment has the following parameters:
wide-angle end focal length Fw =6.20mm; tele end focus Ft =15.52mm.
Table 5 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003900858030000102
Figure BDA0003900858030000111
TABLE 5
Table 6 lists aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the conic surface constant K and fourth-order aspheric surface coefficient A 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric surface coefficient A 16 。
Figure BDA0003900858030000112
Figure BDA0003900858030000121
TABLE 6
Table 7 lists the variable interval values between the lens groups when the zoom lens of the present embodiment changes from the wide angle end to the telephoto end.
Wide angle end Long coke end
D1 18.057 2.216
D2 14.380 1.600
D3 2.200 14.980
TABLE 7
As shown in fig. 2 and tables 1 and 5 to 7, in the zoom lens of this embodiment, in the zooming or magnification-varying process in the full focal length range, the focusing response speed is fast, the magnification-varying ratio of about 2.5 times can be realized, the confocal performance of visible light and infrared light in the full focal length range is satisfied, and the maximum aperture is 1.05 in the magnification-varying process. The zoom lens has a miniaturized design.
EXAMPLE III
The parameters of the zoom lens of the present embodiment are as follows:
wide-angle end focal length Fw =6.65mm; tele end focus Ft =16.65mm.
Table 8 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003900858030000122
Figure BDA0003900858030000131
TABLE 8
Table 9 shows zoom lenses of the present embodimentThe aspherical coefficients of the aspherical lenses of the heads include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 。
Figure BDA0003900858030000141
TABLE 9
Table 10 lists the variable interval values between the lens groups when the zoom lens of the present embodiment changes from the wide angle end to the telephoto end.
Wide angle end Long coke end
D1 15.853 2.100
D2 15.842 1.600
D3 2.200 16.442
TABLE 10
As shown in fig. 3 and tables 1, 8 to 10, the zoom lens of this embodiment has a fast focusing response speed in the zooming or zooming process within the full focal length range, can realize a zoom ratio of about 2.5 times, and simultaneously satisfies the confocal performance of visible light and infrared light within the full focal length range, and realizes a maximum aperture of 1.05 in the zooming process. The zoom lens has a miniaturized design.
Example four
The parameters of the zoom lens of the present embodiment are as follows:
wide-angle end focal length Fw =6.85mm; tele end focus Ft =17.14mm.
Table 11 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003900858030000151
Figure BDA0003900858030000161
TABLE 11
Table 12 lists aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the conic surface constant K and fourth-order aspheric surface coefficient A 4 Sixth order aspherical surface coefficient A 6 Eighth order aspherical surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 。
Figure BDA0003900858030000162
TABLE 12
Table 13 lists the variable interval values between the lens groups when the zoom lens of the present embodiment changes from the wide angle end to the telephoto end.
Figure BDA0003900858030000163
Figure BDA0003900858030000171
Watch 13
As shown in fig. 4 and tables 1, 11 to 13, in the zoom lens of this embodiment, in the zooming or magnification-varying process in the full focal length range, the focusing response speed is fast, the magnification-varying ratio of about 2.5 times can be realized, the confocal performance of visible light and infrared light in the full focal length range is satisfied, and the maximum aperture is 1.05 in the magnification-varying process. The zoom lens has a miniaturized design.
EXAMPLE five
The parameters of the zoom lens of the present embodiment are as follows:
wide-angle end focal length Fw =6.89mm; tele end focus Ft =17.23mm.
Table 14 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003900858030000172
Figure BDA0003900858030000181
TABLE 14
Table 15 lists aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspherical surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 。
Figure BDA0003900858030000182
Watch 15
Table 16 lists the variable interval values between the lens groups when the zoom lens of the present embodiment changes from the wide angle end to the telephoto end.
Wide angle end Long focal length end
D1 16.660 2.100
D2 15.583 1.600
D3 2.200 16.183
TABLE 16
As shown in fig. 5 and tables 1, 14 to 16, the zoom lens of this embodiment has a fast focusing response speed in zooming or zooming process within the full focal length range, can realize a zoom ratio of about 2.5 times, and simultaneously satisfies the confocal performance of visible light and infrared light within the full focal length range, and realizes a maximum aperture of 1.05 in the zooming process. The zoom lens has a miniaturized design.
EXAMPLE six
The parameters of the zoom lens of the present embodiment are as follows:
wide-angle end focal length Fw =6.57mm; tele end focus Ft =16.45mm.
Table 17 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003900858030000191
Figure BDA0003900858030000201
TABLE 17
Table 18 lists aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the conic surface constant K and fourth-order aspheric surface coefficient A 4 Sixth order aspherical surface coefficient A 6 Eighth order aspherical surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric surface coefficient A 16 。
Figure BDA0003900858030000202
Figure BDA0003900858030000211
Watch 18
Table 19 lists the variable interval values between the lens groups when the zoom lens of the present embodiment changes from the wide angle end to the telephoto end.
Wide angle end Long coke end
D1 15.524 2.100
D2 15.507 1.600
D3 2.200 16.107
Watch 19
As shown in fig. 6 and tables 1, 17 to 19, the zoom lens of this embodiment has a fast focusing response speed in zooming or zooming process within the full focal length range, can realize a zoom ratio of about 2.5 times, and simultaneously satisfies the confocal performance of visible light and infrared light within the full focal length range, and realizes a maximum aperture of 1.05 in the zooming process. The zoom lens has a miniaturized design.
EXAMPLE seven
The parameters of the zoom lens of the present embodiment are as follows:
wide-angle end focal length Fw =6.60mm; tele end focus Ft =16.51mm.
Table 20 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003900858030000212
Figure BDA0003900858030000221
Watch 20
Table 21 lists aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the conic surface constant K and fourth-order aspheric surface coefficient A 4 Sixth order aspherical surface coefficient A 6 Eighth order aspherical surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric surface coefficient A 16 。
Figure BDA0003900858030000231
TABLE 21
Table 22 lists the variable interval values between the lens groups when the zoom lens of the present embodiment changes from the wide angle end to the telephoto end.
Wide angle end Long focal length end
D1 12.041 2.100
D2 16.540 1.600
D3 2.200 17.140
TABLE 22
As shown in fig. 7 and tables 1, 20 to 22, the zoom lens of this embodiment has a fast focusing response speed in zooming or zooming process within the full focal length range, can realize a zoom ratio of about 2.5 times, and simultaneously satisfies the confocal performance of visible light and infrared light within the full focal length range, and realizes a maximum aperture of 1.05 in the zooming process. The zoom lens has a miniaturized design.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (10)

1. A zoom lens, comprising, in order from an object side to an image side along an optical axis: a compensation lens group (G1) with negative focal power, a first fixed lens group (G2) with positive focal power, a diaphragm (STO), a zoom lens group (G3) with positive focal power, a second fixed lens group (G4) with positive focal power, a parallel flat plate (CG) and an image surface (IMA),
the compensation lens group (G1) and the magnification-varying lens group (G3) are movable along the optical axis;
the moving distance T1 of the compensation lens group (G1) and the moving distance T2 of the variable magnification lens group (G3) satisfy the following conditional expression: T1/T2 is more than or equal to 0.54 and less than or equal to 1.62.
2. A zoom lens according to claim 1, wherein the compensation lens group (G1) comprises, in order in a direction from the object side to the image side along the optical axis: a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4).
3. A zoom lens according to claim 2, wherein the first lens (L1) and the fourth lens (L4) have negative optical power.
4. The zoom lens according to claim 2, wherein in a direction from the object side to the image side along the optical axis,
the first lens (L1) is a convex-concave lens;
the second lens (L2) is a concave-convex lens, a concave-concave lens or a convex-convex lens;
the third lens (L3) is a concave-convex lens or a concave-convex lens;
the object side surface of the fourth lens (L4) is concave in shape.
5. A zoom lens according to claim 1, wherein the first fixed lens group (G2) includes: a fifth lens (L5).
6. A zoom lens according to claim 5, characterized in that the fifth lens (L5) has positive optical power.
7. A zoom lens according to claim 5, characterized in that the object-side surface of the fifth lens (L5) is convex in shape.
8. A zoom lens according to claim 1, wherein the variable power lens group (G3) includes, in order in a direction from the object side to the image side along the optical axis: a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), and a ninth lens (L9).
9. The zoom lens according to claim 8, wherein the sixth lens (L6) and the ninth lens (L9) have positive optical power.
10. The zoom lens according to claim 8, wherein, in a direction from the object side to the image side along the optical axis,
the sixth lens (L6) is a convex lens;
the seventh lens (L7) is a convex-convex lens, a concave-convex lens or a concave-concave lens;
the eighth lens (L8) is a concave-concave lens, a convex-concave lens or a convex-convex lens;
the ninth lens (L9) is a convex lens or a concave-convex lens.
CN202211289750.6A 2022-10-20 2022-10-20 Zoom lens Pending CN115542523A (en)

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