CN217385979U - Zoom lens - Google Patents
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- CN217385979U CN217385979U CN202221401171.1U CN202221401171U CN217385979U CN 217385979 U CN217385979 U CN 217385979U CN 202221401171 U CN202221401171 U CN 202221401171U CN 217385979 U CN217385979 U CN 217385979U
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Abstract
The utility model relates to a zoom lens follows the direction of optical axis from the thing side to picture side, includes in proper order: a first fixed lens group (G1) having positive optical power, a zoom lens group (G2) having negative optical power, an aperture Stop (STO), a second fixed lens group (G3) having positive optical power, a focus lens group (G4) having positive optical power, and a third fixed lens group (G5) having positive optical power, the zoom lens group (G2) and the focus lens group (G4) being movable along an optical axis, a focal length FG2 of the zoom lens group (G2) and a focal length Fw of the zoom lens at a wide-angle end satisfying a conditional expression: FG2/Fw is less than or equal to-2.2 and less than or equal to-2.0. The zoom lens realizes a zoom ratio of 12 times, meets the performance requirements of high magnification and small volume, gives consideration to the imaging performance of low distortion, and also realizes 4M imaging from a wide-angle end to a long-focus end.
Description
Technical Field
The utility model relates to an optical system and device technical field especially relate to a zoom.
Background
The lens is used as the key equipment of the video system, and the quality index of the lens directly influences the index of the whole machine. The requirements of complex application scenes on the shooting distance, the field angle, the distortion, the definition and the like of a picture are higher and higher, and the medium-and large-power zoom lens gradually becomes the mainstream of the industry. However, distortion and the angle of view are restricted to each other, and the distortion of an image increases with an increase in the angle of view, and the analysis of the image is affected by the distortion. The existing lens is difficult to be compatible with the performances of medium-large zoom, wide angle and low distortion.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the present invention provides a zoom lens.
To achieve the above object, the present invention provides a zoom lens, sequentially including, in a direction from an object side to an image side along an optical axis: a first fixed lens group having positive optical power, a zoom lens group having negative optical power, an aperture stop, a second fixed lens group having positive optical power, a focus lens group having positive optical power, and a third fixed lens group having positive optical power, the zoom lens group and the focus lens group being movable along an optical axis, a focal length FG2 of the zoom lens group and a focal length Fw of the zoom lens at a wide-angle end satisfying a conditional expression: FG2/Fw is less than or equal to-2.2 and less than or equal to-2.0.
According to an aspect of the present invention, along the direction of the optical axis from the object side to the image side, the first fixed lens group includes in order: a first lens having a negative optical power, a second lens having a positive optical power, and a third lens having a positive optical power.
According to an aspect of the present invention, the object side surface and the image side surface of the first lens, the second lens and the third lens are convex and concave, respectively;
the first lens and the second lens are glued to form a double-glued lens.
According to an aspect of the present invention, Abbe number Ab of the material of the first lens 1 The conditional expression is satisfied: ab 1 ≤30。
According to an aspect of the present invention, the radius of curvature R of the cemented surface of the first lens and the second lens L1L2 And a focal length FG1 of the first fixed lens group satisfy the conditional expression: r is more than or equal to 0.5 L1L2 /FG1≤0.7。
According to an aspect of the present invention, along the direction of the optical axis from the object side to the image side, the zoom lens group includes in order: a fourth lens having a negative power, a fifth lens having a negative power, a sixth lens having a negative power, and a seventh lens having a positive power.
According to an aspect of the present invention, the object-side surface and the image-side surface of the fourth lens are convex and concave, respectively;
the paraxial region of the image side surface of the fifth lens is concave;
the image side surface of the sixth lens is concave;
the object side surface and the image side surface of the seventh lens are convex;
and the sixth lens and the seventh lens are glued to form a double-glued lens.
According to an aspect of the present invention, Abbe number Ab of the material of the seventh lens 7 The conditional expression is satisfied: ab 7 ≤30。
According to an aspect of the present invention, along the direction of the optical axis from the object side to the image side, the second fixed lens group includes in order: an eighth lens having a positive optical power and a ninth lens having a negative optical power.
According to an aspect of the present invention, the object-side surface and the image-side surface of the eighth lens element are convex;
the ninth lens is a paraxial region concave-convex lens, or a paraxial region convex-concave lens in a direction from the object side to the image side along the optical axis.
According to an aspect of the present invention, Abbe number Ab of the material of the eighth lens 8 And Abbe number Ab of material of the ninth lens 9 The following conditional expressions are respectively satisfied:
Ab 8 ≥80；
Ab 9 ≤30。
according to an aspect of the present invention, along the direction of optical axis from the object side to the image side, focus the lens group and include in proper order: a tenth lens having positive optical power, an eleventh lens having positive optical power, a twelfth lens having positive or negative optical power, and a thirteenth lens having positive or negative optical power.
According to an aspect of the present invention, the paraxial region of the object-side surface and the image-side surface of the tenth lens is convex;
the object side surface of the eleventh lens is convex;
the twelfth lens is a convex-convex lens, a convex-concave lens or a concave-concave lens;
the paraxial region of the image-side surface of the thirteenth lens is concave in shape.
According to an aspect of the present invention, Abbe number Ab of material of the eleventh lens 11 The conditional expression is satisfied: ab 11 ≥80。
According to an aspect of the present invention, the third fixed lens group includes: a fourteenth lens having positive optical power.
According to an aspect of the present invention, the object-side surface and the image-side surface of the fourteenth lens element are concave and convex, respectively.
According to an aspect of the present invention, the fourteenth lens is an aspherical lens.
According to an aspect of the present invention, the zoom lens group, the second fixed lens group, the focus lens group and the third fixed lens group include at least one aspheric lens.
According to an aspect of the present invention, the focal length FG1 of the first fixed lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy the conditional expression: FG1/Fw is more than or equal to 14.0 and less than or equal to 14.5.
According to an aspect of the present invention, the focal length FG3 of the second fixed lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy the conditional expression: FG3/Fw is more than or equal to 8.8 and less than or equal to 9.6.
According to an aspect of the present invention, the focal length FG4 of the focus lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy the conditional expression: FG4/Fw is more than or equal to 4.5 and less than or equal to 5.4.
According to an aspect of the present invention, the focal length FG5 of the third fixed lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy the conditional expression: FG5/Fw is more than or equal to 9.4 and less than or equal to 14.6.
According to an aspect of the present invention, the stroke distance D2 of the zoom lens group and the stroke distance D4 of the focus lens group satisfy the conditional expression: 2.7 is less than or equal to D2/D4 is less than or equal to 3.1.
According to the utility model discloses a scheme adopts above-mentioned 14 pieces of lenses and forms "just-negative-just-positive" five crowd's framework jointly, realizes 12 times zoom ratio, satisfies the performance demand of high magnification, small volume, compromises the imaging performance of low distortion for this zoom realizes forming images from wide-angle end to the 4M of telephoto end. The zoom lens also uses an iris diaphragm, the maximum aperture can reach F-1.80, and the use requirements of various application scenes are met.
According to the utility model discloses a scheme adopts above-mentioned 14 pieces of lenses, and the focal power of each lens of rational distribution and the shape of object side and image side to specific lens adopts the selection of the material of specific dispersion coefficient, specific material, specific face type, has realized the correction of chromatic aberration and second grade spectrum between zoom lens telephoto end 380 ~ 940nm, higher image quality has under the different temperatures of-20-60 ℃ within range, satisfy the application demand of multiple complicated scene, and correct the component tolerance, possess good equipment processing nature.
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 schematically illustrates a schematic structural diagram of a zoom lens according to a first embodiment of the present invention;
fig. 2 schematically illustrates a schematic structural view of a zoom lens according to a second embodiment of the present invention;
fig. 3 schematically illustrates a schematic structural diagram of a zoom lens according to a third embodiment of the present invention;
fig. 4 schematically illustrates a schematic structural diagram of a zoom lens according to a fourth 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 appended 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 for convenience. 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 to 4, a zoom lens according to an embodiment of the present invention sequentially includes, along an optical axis from an object side to an image side: a first fixed lens group G1 having positive optical power, a zoom lens group G2 having negative optical power, an aperture stop STO, a second fixed lens group G3 having positive optical power, a focus lens group G4 having positive optical power, and a third fixed lens group G5 having positive optical power. The zoom lens group G2 is movable along the optical axis for optical zooming of the zoom lens between the wide-angle end and the telephoto end, and the focus lens group G4 is movable along the optical axis for compensating the image plane position variation of the zoom lens during the optical zooming. The aperture stop STO is an iris diaphragm, and the maximum aperture F of the zoom lens can be set to 1.80. Through the arrangement, five lens groups with the focal powers of positive, negative, positive and positive are adopted, compatibility of high magnification and small volume of the zoom lens is achieved, meanwhile, the resolution of a full focal section (from a wide angle end to a telephoto end) of the zoom lens is guaranteed to meet 4M, and low distortion imaging performance and a large field angle are considered.
In the embodiment of the present invention, along the direction from the object side to the image side along the optical axis, the first fixed lens group G1 sequentially includes: a first lens L1 having a negative power, a second lens L2 having a positive power, and a third lens L3 having a positive power. With respect to the lens shape, the object side surfaces of the first lens L1, the second lens L2, and the third lens L3 are all convex, and the image side surfaces thereof are all concave. The first lens L1 and the second lens L2 are cemented together to form a double cemented lens.
In an embodiment of the present invention, along a direction from an object side to an image side along an optical axis, the zoom lens group G2 includes: a fourth lens L4 having a negative power, a fifth lens L5 having a negative power, a sixth lens L6 having a negative power, and a seventh lens L7 having a positive power. For the lens shape, the object side of the fourth lens L4 is convex, and the image side thereof is concave; the paraxial region of the image-side surface of the fifth lens L5 is concave in shape; the image-side surface of the sixth lens element L6 is concave; the object-side surface and the image-side surface of the seventh lens L7 are both convex. The sixth lens L6 and the seventh lens L7 are cemented together to form a double cemented lens.
In an embodiment of the present invention, along the direction from the object side to the image side along the optical axis, the second fixed lens group G3 sequentially includes: an eighth lens L8 having a positive power and a ninth lens L9 having a negative power. For the lens shape, both the object-side surface and the image-side surface of the eighth lens L8 are convex; the ninth lens L9 is a paraxial region concave-convex lens, or a paraxial region convex-concave lens.
In the embodiment of the present invention, along the direction from the object side to the image side along the optical axis, the focusing lens group G4 includes in order: a tenth lens L10 having positive optical power, an eleventh lens L11 having positive optical power, a twelfth lens L12 having positive or negative optical power, and a thirteenth lens L13 having positive or negative optical power. As for the lens shape, the paraxial region shapes of the object side and the image side of the tenth lens L10 are both convex; the object side surface of the eleventh lens L11 is convex; the twelfth lens L12 is a convex-convex lens, a convex-concave lens, or a concave-concave lens; the paraxial region of the image-side surface of the thirteenth lens L13 is concave in shape.
In an embodiment of the present invention, the third fixed lens group G5 includes: a fourteenth lens L14 having positive optical power. With respect to the lens shape, the object side surface of the fourteenth lens L14 is concave, and the image side surface thereof is convex.
The embodiment of the utility model provides an in, contain one piece of aspherical lens in zoom lens group G2, the fixed lens group G3 of second, focus lens group G4 and the fixed lens group G5 of third at least, can effectively correct the distortion of each multiplying power of zoom. Preferably, the fourteenth lens L14 is an aspheric lens, so that each magnification aberration of the zoom lens in the zooming process is effectively corrected, and the imaging performance of the zoom lens in high-temperature and low-temperature environments is balanced, thereby specifically realizing higher imaging quality at different temperatures within the range of-20 to 60 ℃, and meeting the application requirements of various complex scenes.
In the embodiment of the present invention, Abbe number Ab of the first lens L1 1 Abbe number Ab of material of seventh lens L7 7 Abbe number Ab of material of eighth lens L8 8 Abbe number Ab of material of ninth lens L9 9 Abbe number Ab of material of eleventh lens L11 11 The following conditional expressions are respectively satisfied: ab 1 ≤30；Ab 7 ≤30；Ab 8 ≥80；Ab 9 Less than or equal to 30; and Ab 11 Not less than 80. The lenses are made of materials with specific dispersion coefficients, so that chromatic aberration of the zoom imaging system can be effectively corrected, and high-definition imaging is obtained.
In the embodiment of the present invention, the curvature radius R of the bonding surface of the first lens L1 and the second lens L2 L1L2 And a focal length FG1 of the first fixed lens group G1 satisfy the conditional expression: r is more than or equal to 0.5 L1L2 the/FG 1 is less than or equal to 0.7, the field angle of the wide-angle end of the zoom lens is effectively increased, the miniaturization of the lens is realized, and the cost can be reduced. Wherein the angle of view can reach 82 deg..
In the embodiment of the present invention, the focal length FG1 of the first fixed lens group G1, the focal length FG2 of the zoom lens group G2, the focal length FG3 of the second fixed lens group G3, the focal length FG4 of the focus lens group G4, and the focal length FG5 of the third fixed lens group G5 satisfy the following conditional expressions with the focal length Fw of the zoom lens at the wide-angle end, respectively: FG1/Fw is more than or equal to 14.0 and less than or equal to 14.5; FG2/Fw is less than or equal to-2.2 and less than or equal to-2.0; FG3/Fw is more than or equal to 8.8 and less than or equal to 9.6; FG4/Fw is more than or equal to 4.5 and less than or equal to 5.4; and FG5/Fw is not less than 9.4 and not more than 14.6. Through the reasonable distribution of the positive and negative focal powers and the ranges thereof of the five lens groups, the optical imaging zoom lens has higher imaging quality, and 4M imaging from a wide-angle end to a telephoto end is realized.
In the embodiment of the present invention, the stroke distance D2 of the zoom lens group G2 and the stroke distance D4 of the focus lens group G4 satisfy the following conditional expression: 2.7 is less than or equal to D2/D4 is less than or equal to 3.1. By designing the relationship between the zoom stroke and the focus stroke, the zoom lens can realize the zoom of 12 times (realize the zoom ratio of 12 times) and is compatible with miniaturization and small volume.
To sum up, the utility model discloses zoom lens adopts above-mentioned 14 pieces of lenses, and the focal power of each lens of rational distribution and the shape of object side and image side to specific lens adopt the selection of the material of specific dispersion coefficient, specific material, specific face type, realized the correction of chromatic aberration and second grade spectrum between zoom lens telephoto end 380 ~ 940nm, have higher image quality under the different temperatures in-20-60 ℃ scope, satisfy the application demand of multiple complicated scene, and correct the component tolerance, possess good equipment processing nature. Meanwhile, the 14 lenses jointly form a five-group structure of positive-negative-positive, so that a zoom ratio of 12 times is realized, the performance requirements of high magnification and small volume are met, and the imaging performance of low distortion is considered, so that the zoom lens realizes 4M imaging from a wide-angle end to a long-focus end. In addition, the zoom lens uses an iris diaphragm, the maximum aperture can reach F to 1.80, and the use requirements of various application scenes are met.
The zoom lens of the present invention will be specifically described below with reference to four embodiments with reference to the drawings and tables. In each of the following embodiments, the present invention is configured to record the stop STO as one surface, record the image plane IMA as one surface, and record the protective glass as both surfaces, where the protective glass is located between the fourteenth lens L14 and the image plane IMA.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
In an embodiment of the present invention, the plastic 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 of the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k is 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
Referring to fig. 1, the parameters of the zoom lens of the present embodiment are as follows:
table 2 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
TABLE 2
Table 3 lists aspherical coefficients of the respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric surface constant K and the fourth-order aspheric surface of the surfaceCoefficient A 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 And a twelfth order aspherical surface coefficient A 12 。
Table 3 table 4 lists the magnification-varying data of the zoom lens of the present embodiment at the wide-angle end and the telephoto end.
| Wide angle end | Telescope end | |
| T1 | 1.10 | 32.30 |
| T2 | 32.90 | 1.70 |
| T3 | 14.59 | 3.62 |
| T4 | 2.32 | 13.29 |
TABLE 4
As shown in fig. 1 and tables 1 to 4, in the direction from the object side to the image side along the optical axis, the fifth lens L5, the ninth lens L9, and the thirteenth lens L13 are all paraxial concave lenses, the sixth lens L6 is a concave lens, and the eleventh lens L11 and the twelfth lens L12 are all convex lenses. The fifth lens L5, the ninth lens L9, the tenth lens L10, and the fourteenth lens L14 are all aspheric lenses. The zoom lens of the embodiment adopts 14 lenses and forms a five-group structure with focal power of positive-negative-positive in sequence, the maximum aperture is 1.8, the zoom ratio is 12 times, the imaging quality is higher at different temperatures within the range of-20 to 60 ℃, the field angle at the wide angle end is greater than 80 degrees, and the optical zoom performance with small distortion and large magnification is considered.
Example two
Referring to fig. 2, the parameters of the zoom lens of the present embodiment are as follows:
table 5 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
Table 5 table 6 lists aspherical surface 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 And a twelfth order aspherical surface coefficient A 12 。
| Surface number | K | A 4 | A 6 | A 8 | A 10 | A 12 |
| S8 | -1.52 | -5.69E-04 | 1.58E-05 | -4.40E-07 | 7.43E-09 | -5.88E-11 |
| S9 | -30.00 | -1.89E-04 | 6.81E-07 | -1.47E-08 | 1.78E-10 | -3.57E-12 |
| S16 | -30.00 | 1.87E-04 | 3.60E-06 | -2.31E-07 | 5.64E-09 | -5.06E-11 |
| S17 | -30.00 | 3.96E-04 | 2.00E-06 | -2.12E-07 | 5.92E-09 | -5.52E-11 |
| S18 | -2.36 | 1.02E-04 | 1.13E-06 | -9.04E-08 | 2.13E-09 | -3.90E-11 |
| S19 | -26.00 | 2.02E-04 | 2.34E-07 | -1.13E-08 | -2.79E-10 | -1.41E-11 |
| S25 | -3.25 | 1.98E-04 | -3.15E-05 | 7.60E-07 | 8.53E-09 | -9.72E-10 |
| S26 | -30.00 | -1.66E-03 | 1.39E-04 | -1.00E-05 | 4.20E-07 | -7.52E-09 |
Table 6 table 7 lists the magnification-varying data of the zoom lens of the present embodiment at the wide-angle end and the telephoto end.
| Wide angle end | Telescope end | |
| T1 | 1.10 | 32.30 |
| T2 | 32.90 | 1.70 |
| T3 | 13.60 | 3.17 |
| T4 | 2.43 | 12.86 |
TABLE 7
As shown in fig. 2 and tables 1 and 5 to 7, in a direction from the object side to the image side along the optical axis, the fifth lens L5 and the thirteenth lens L13 are both paraxial concave lenses, the sixth lens L6 is a plano-concave lens, the ninth lens L9 is a paraxial concave-convex lens, and the eleventh lens L11 and the twelfth lens L12 are both convex-convex lenses. The fifth lens L5, the ninth lens L9, the tenth lens L10, and the fourteenth lens L14 are all aspheric lenses. The zoom lens of the embodiment adopts 14 lenses and forms a five-group structure with sequentially positive-negative-positive focal power, so that the maximum aperture is 1.8, the zoom ratio is 12 times, the imaging quality is high at different temperatures within the range of-20 to 60 ℃, and the field angle at the wide angle end is greater than 80 degrees. By using the variable diaphragm, the imaging quality is good and the distortion is low under different illumination environments.
EXAMPLE III
Referring to fig. 3, the parameters of the zoom lens of the present embodiment are as follows:
table 8 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
TABLE 8
Table 9 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 And a twelfth order aspherical surface coefficient A 12 。
| Surface number | K | A 4 | A 6 | A 8 | A 10 | A 12 |
| S8 | 30.00 | -7.76E-04 | 1.77E-05 | -5.10E-07 | 8.98E-09 | -7.54E-11 |
| S9 | -27.91 | -2.67E-04 | -3.69E-06 | 1.10E-07 | -1.65E-09 | 5.12E-12 |
| S16 | -20.86 | -3.46E-05 | 1.91E-06 | -9.06E-08 | 1.77E-09 | -2.25E-12 |
| S17 | -10.94 | 3.09E-05 | 2.14E-06 | -1.00E-07 | 2.17E-09 | -5.84E-12 |
| S23 | -0.78 | 2.81E-04 | 7.61E-06 | -4.59E-07 | 2.02E-08 | -5.20E-10 |
| S24 | 2.59 | 4.26E-04 | 4.60E-06 | 2.59E-08 | -9.63E-09 | -4.11E-10 |
| S25 | 1.60 | 4.01E-04 | -2.49E-05 | 5.91E-07 | 3.03E-10 | -4.14E-10 |
| S26 | -0.30 | 6.52E-04 | -2.81E-05 | 1.77E-07 | 3.19E-08 | -1.13E-09 |
Table 9 table 10 lists the magnification-varying data of the zoom lens of the present embodiment at the wide-angle end and the telephoto end.
| Wide angle end | The telescope end | |
| T1 | 0.98 | 32.17 |
| T2 | 32.89 | 1.70 |
| T3 | 14.34 | 3.47 |
| T4 | 2.60 | 13.47 |
Watch 10
As shown in fig. 3 and tables 1 and 8 to 10 above, in a direction from the object side to the image side along the optical axis, the fifth lens L5, the ninth lens L9, and the thirteenth lens L13 are all paraxial region convex-concave lenses, the sixth lens L6 is a concave-concave lens, and the eleventh lens L11 and the twelfth lens L12 are all convex-concave lenses. The fifth lens L5, the ninth lens L9, the thirteenth lens L13, and the fourteenth lens L14 are all aspheric lenses. The zoom lens of the embodiment adopts 14 lenses and forms a five-group structure with sequentially positive-negative-positive focal power, so that the maximum aperture is 1.8, the zoom ratio is 12 times, the imaging quality is high at different temperatures within the range of-20 to 60 ℃, and the field angle at the wide angle end is greater than 80 degrees. By using the variable diaphragm, the imaging quality is good and the distortion is low under different illumination environments.
Example four
Referring to fig. 4, the parameters of the zoom lens of the present embodiment are as follows:
table 11 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
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 aspheric surface coefficient A 8 Ten-order aspheric systemNumber A 10 And a twelfth order aspherical surface coefficient A 12 。
TABLE 12
Table 13 lists the variable magnification data at the wide angle end and the telephoto end of the zoom lens of the present embodiment.
| Wide angle end | Telescope end | |
| T1 | 1.10 | 32.29 |
| T2 | 32.89 | 1.70 |
| T3 | 14.08 | 3.19 |
| T4 | 2.34 | 13.23 |
Watch 13
With reference to fig. 4 and tables 1 and 11 to 13, in a direction from the object side to the image side along the optical axis, the fifth lens L5 is a paraxial region concave lens, the ninth lens L9 and the thirteenth lens L13 are both paraxial region convex-concave lenses, the sixth lens L6 is a concave lens, the eleventh lens L11 is a convex-concave lens, and the twelfth lens L12 is a concave lens. The fifth lens L5, the ninth lens L9, the thirteenth lens L13, and the fourteenth lens L14 are all aspheric lenses. The zoom lens of the embodiment adopts 14 lenses and forms a five-group structure with focal power of positive-negative-positive in sequence, the maximum aperture is 1.8, the zoom ratio is 12 times, the imaging quality is high at different temperatures within the range of-20 to 60 ℃, and the field angle at the wide-angle end is larger than 80 degrees. By using the variable diaphragm, the imaging quality is good and the distortion is low under different illumination environments.
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 (23)
1. A zoom lens includes, in order from an object side to an image side along an optical axis: -a first fixed lens group (G1) having positive optical power, -a zoom lens group (G2) having negative optical power, -an aperture Stop (STO), -a second fixed lens group (G3) having positive optical power, -a focus lens group (G4) having positive optical power, and-a third fixed lens group (G5) having positive optical power, said zoom lens group (G2) and said focus lens group (G4) being movable along the optical axis, characterized in that the focal length FG2 of said zoom lens group (G2) and the focal length Fw of said zoom lens at the wide-angle end satisfy the conditional expression: FG2/Fw is less than or equal to-2.2 and less than or equal to-2.0.
2. The zoom lens according to claim 1, wherein the first fixed lens group (G1) includes, in order in a direction from the object side to the image side along the optical axis: a first lens (L1) having a negative optical power, a second lens (L2) having a positive optical power, and a third lens (L3) having a positive optical power.
3. The zoom lens according to claim 2, wherein the object-side and image-side surfaces of the first lens (L1), the second lens (L2), and the third lens (L3) are convex and concave, respectively;
the first lens (L1) and the second lens (L2) are cemented to form a double cemented lens.
4. The zoom lens according to claim 3, wherein a radius of curvature R of a cemented surface of the first lens (L1) and the second lens (L2) L1L2 A focal length FG1 with the first fixed lens group (G1) satisfies the conditional expression: r is more than or equal to 0.5 L1L2 /FG1≤0.7。
5. Zoom lens according to claim 2, wherein Abbe number Abbe of the material of the first lens (L1) 1 The conditional expression is satisfied: ab 1 ≤30。
6. The zoom lens according to claim 1, wherein the zoom lens group (G2) includes, in order along an optical axis from an object side to an image side: a fourth lens (L4) having a negative power, a fifth lens (L5) having a negative power, a sixth lens (L6) having a negative power, and a seventh lens (L7) having a positive power.
7. A zoom lens according to claim 6, wherein the object-side surface and the image-side surface of the fourth lens (L4) are convex and concave, respectively;
a paraxial region of an image-side surface of the fifth lens (L5) is concave in shape;
the image side surface of the sixth lens (L6) is concave;
the object side surface and the image side surface of the seventh lens (L7) are both convex;
the sixth lens (L6) and the seventh lens (L7) are cemented to form a double cemented lens.
8. Zoom lens according to claim 6, wherein Abbe number Abbe of the material of the seventh lens (L7) 7 The conditional expression is satisfied: ab 7 ≤30。
9. The zoom lens according to claim 1, wherein the second fixed lens group (G3) includes, in order in a direction from the object side to the image side along the optical axis: an eighth lens (L8) having a positive optical power and a ninth lens (L9) having a negative optical power.
10. A zoom lens according to claim 9, wherein the object-side surface and the image-side surface of the eighth lens (L8) are both convex;
the ninth lens (L9) is a paraxial region concave-convex lens, or a paraxial region convex-concave lens in a direction from the object side to the image side along the optical axis.
11. A zoom lens according to claim 9, wherein abbe number Ab of the material of the eighth lens (L8) 8 And Abbe number Ab of the material of the ninth lens (L9) 9 The following conditional expressions are respectively satisfied:
Ab 8 ≥80；
Ab 9 ≤30。
12. the zoom lens according to claim 1, wherein the focus lens group (G4) includes, in order in a direction from the object side to the image side along an optical axis: a tenth lens (L10) having positive optical power, an eleventh lens (L11) having positive optical power, a twelfth lens (L12) having positive or negative optical power, and a thirteenth lens (L13) having positive or negative optical power.
13. The zoom lens according to claim 12, wherein paraxial regions of the object side and the image side of the tenth lens (L10) are both convex in shape;
the object side surface of the eleventh lens (L11) is convex;
the twelfth lens (L12) is a convex-convex lens, a convex-concave lens or a concave-concave lens;
the paraxial region of the image-side surface of the thirteenth lens (L13) is concave in shape.
14. A zoom lens according to claim 12, wherein abbe number Ab of the material of the eleventh lens (L11) 11 The conditional expression is satisfied: ab 11 ≥80。
15. A zoom lens according to claim 1, wherein the third fixed lens group (G5) includes: a fourteenth lens (L14) having positive optical power.
16. The zoom lens according to claim 15, wherein an object side surface and an image side surface of the fourteenth lens (L14) are concave and convex, respectively.
17. The zoom lens according to claim 15, wherein the fourteenth lens (L14) is an aspherical lens.
18. The zoom lens according to claim 1, wherein the zoom lens group (G2), the second fixed lens group (G3), the focus lens group (G4), and the third fixed lens group (G5) comprise at least one aspheric lens.
19. A zoom lens according to any one of claims 1 to 18, wherein the focal length FG1 of the first fixed lens group (G1) and the focal length Fw of the zoom lens at the wide-angle end satisfy the conditional expression: FG1/Fw is more than or equal to 14.0 and less than or equal to 14.5.
20. A zoom lens according to any one of claims 1 to 18, wherein the focal length FG3 of the second fixed lens group (G3) and the focal length Fw of the zoom lens at the wide-angle end satisfy the conditional expression: FG3/Fw is more than or equal to 8.8 and less than or equal to 9.6.
21. The zoom lens according to any one of claims 1 to 18, wherein a focal length FG4 of the focusing lens group (G4) and a focal length Fw of the zoom lens at a wide-angle end satisfy the conditional expression: FG4/Fw is more than or equal to 4.5 and less than or equal to 5.4.
22. A zoom lens according to any one of claims 1 to 18, wherein the focal length FG5 of the third fixed lens group (G5) and the focal length Fw of the zoom lens at the wide-angle end satisfy the conditional expression: FG5/Fw is more than or equal to 9.4 and less than or equal to 14.6.
23. The zoom lens according to any one of claims 1 to 18, wherein a stroke distance D2 of the zoom lens group (G2) and a stroke distance D4 of the focus lens group (G4) satisfy the conditional expression: 2.7 is less than or equal to D2/D4 is less than or equal to 3.1.
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