CN216351505U - Zoom lens - Google Patents
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- CN216351505U CN216351505U CN202123099026.0U CN202123099026U CN216351505U CN 216351505 U CN216351505 U CN 216351505U CN 202123099026 U CN202123099026 U CN 202123099026U CN 216351505 U CN216351505 U CN 216351505U
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Abstract
The present invention relates to a zoom lens, which comprises the following components in sequence from an object side to an image side along an optical axis: a first fixed lens group (G1) having positive optical power, a first zoom lens group (G2) having negative optical power, an aperture Stop (STO), a second fixed lens group (G3) having positive optical power, a second zoom lens group (G4) having positive optical power, and a focus lens group (G5) having positive optical power, the first zoom lens group (G2), the second zoom lens group (G4), and the focus lens group (G5) all being movable in an optical axis direction, a focal length (FG5) of the focus lens group (G5) and a focal length (FW) of a wide-angle end of the zoom lens satisfying a relation: FG5/FW is not less than 4.0 and not more than 5.0. The zoom lens has the zoom ratio of more than 25 times, the maximum aperture can reach F1.6, the zoom lens has large zoom ratio, wide angle, low distortion and smaller volume, chromatic aberration is effectively corrected, purple edges of a full-focus section are smaller than 4 pixel points, and the resolution of the full-focus section is ensured to meet 4K imaging.
Description
Technical Field
The utility model relates to the technical field of optical imaging, in particular to a zoom lens.
Background
With the development of the internet, the demand of video conferences is increasing day by day, and the requirement of high-end markets on the definition of pictures is higher and higher due to the arrival of the 5G era of the internet, and the 4K resolution becomes the mainstream. The resolution of the existing large-magnification zoom lens is mostly at the level of 2M, and the current user requirements cannot be met. On the other hand, the optical system is generally difficult to be miniaturized due to the restrictions of specifications such as a large magnification, a wide angle, and a low distortion. On the other hand, the existing large-magnification zoom lenses in the market generally have the problem of serious purple fringing, and the overall effect of the picture is seriously influenced.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model provides the zoom lens, the zoom ratio exceeds 25 times, the maximum aperture can reach F1.6, the large zoom ratio, the wide angle, the low distortion and the smaller volume are considered, the chromatic aberration is effectively corrected, the purple edge of the full-focus section is smaller than 4 pixel points, the purple edge effect is good, and the resolution of the full-focus section is ensured to meet 4K imaging.
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: a first fixed lens group with positive optical power, a first zoom lens group with negative optical power, an aperture stop, a second fixed lens group with positive optical power, a second zoom lens group with positive optical power, and a focus lens group with positive optical power, the first zoom lens group, the second zoom lens group, and the focus lens group all being movable along an optical axis direction, a focal length FG5 of the focus lens group and a focal length FW at a wide-angle end of the zoom lens satisfying a relation: FG5/FW is not less than 4.0 and not more than 5.0.
According to one aspect of the utility model, the focal length FG1 of the first fixed lens group satisfies the relationship: FG1/FW is more than or equal to 8.5 and less than or equal to 10.5;
a focal length FG2 of the first zoom lens group satisfies the relation: FG2/FW is not less than-2.5 and not more than-1.5;
a focal length FG4 of the second zoom lens group satisfies the relation: FG4/FW is more than or equal to 4.2 and less than or equal to 5.0;
wherein FW is a focal length at the wide-angle end of the zoom lens.
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 fixed lens group sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power and a fourth lens with positive focal power;
the first lens and the second lens are cemented to form a cemented lens.
According to one aspect of the utility model, the first lens has a convex object-side surface and a concave image-side surface;
the object side surfaces of the second lens, the third lens and the fourth lens are convex.
According to an aspect of the utility model, the Abbe number Ab of the material of the second lens2Abbe number Ab of material of the third lens3And Abbe number Ab of material of the fourth lens4Satisfy the relational expression respectively: ab2≥70；Ab3≥70；Ab4≥65。
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 zoom lens group sequentially comprises a fifth lens with negative focal power, a sixth lens with negative focal power, a seventh lens with negative focal power and an eighth lens with positive focal power.
According to one aspect of the utility model, the image side surfaces of the fifth lens and the sixth lens are both concave;
the object side surface and the image side surface of the seventh lens are both concave;
and the object side surface and the image side surface of the eighth lens are both convex.
According to an aspect of the utility model, the seventh lens and the eighth lens are cemented to form a double cemented lens.
According to an aspect of the utility model, Abbe number Ab of a material of the seventh lens7Satisfy the relation: ab7≥70。
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the second fixed lens group sequentially comprises a ninth lens with positive focal power and a tenth lens with negative focal power.
According to an aspect of the utility model, both the object-side surface and the image-side surface of the ninth lens are convex.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the second zoom lens group sequentially comprises an eleventh lens with positive focal power, a twelfth lens with negative focal power, a thirteenth lens with positive focal power, a fourteenth lens with positive focal power and a fifteenth lens with negative focal power.
According to one aspect of the utility model, the eleventh lens has both an object-side surface and an image-side surface that are convex;
the object side surfaces of the thirteenth lens and the fourteenth lens are both convex;
the image side surface of the fifteenth lens is concave.
According to an aspect of the utility model, Abbe number Ab of a material of the thirteenth lens13Satisfy the relation: ab13≥70。
According to an aspect of the utility model, Abbe number Ab of a material of the fourteenth lens14Satisfy the relation: ab14≤25。
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the focusing lens group sequentially comprises a sixteenth lens with positive or negative optical power, a seventeenth lens with positive or negative optical power and an eighteenth lens with positive or negative optical power.
According to one aspect of the present invention, the zoom lens includes at least one glass aspheric lens.
According to an aspect of the present invention, the stroke D2 of the first zoom lens group and the stroke D4 of the second zoom lens group satisfy the relation: the absolute value of D2/D4 is more than or equal to 1.5 and less than or equal to 2.0.
According to an aspect of the utility model, the focal length FG2 of the first zoom lens group and the focal length FG4 of the second zoom lens group satisfy the relation: FG2/FG4 is less than or equal to-0.46 and less than or equal to-0.30.
According to an aspect of the present invention, the maximum lens diameter Φ G1 of the first fixed lens group and the total length TTL of the zoom lens satisfy the relation: phi G1/TTL is less than or equal to 0.4.
According to the scheme of the utility model, the zoom lens realizes that the zoom ratio exceeds 25 times and the maximum aperture can reach F1.6 by adopting a five-group structure of positive-negative-positive and a three-group linkage mode of two-zoom and one-focusing. Due to the reasonable design of the framework, the distortion of a large angle is effectively corrected, the maximum optical distortion of a full-focus section is less than 5%, and an imaging picture is uniform and undistorted. And then, by combining the focal length of the five groups of groups, the shapes of the object side surface and the image side surface of each lens in the five groups of groups, the surface shape of the lens and the like reasonably, the optical system has smaller volume and miniaturization while realizing large zoom ratio, wide angle and low distortion, and simultaneously ensures that the resolution of the full focus section meets 4K imaging.
Through the selection of specific glass materials in the 18 lenses, the reasonable collocation of the cemented lenses and the distribution of focal power, the chromatic aberration of the lens is effectively corrected, so that the purple fringing of the full-focus section is smaller than 4 pixel points, the imaging effect is good, and the purple fringing effect and the chromatic aberration effect are better. Meanwhile, the tolerance of lens elements is effectively corrected, so that the lens has good assembly processability, and the resolution of the zoom lens is improved.
Drawings
Fig. 1 schematically shows a configuration of a zoom lens according to embodiment 1 of the present invention;
fig. 2 schematically shows a defocus graph at the wide-angle end of a zoom lens according to embodiment 1 of the present invention;
FIG. 3 is a defocus graph schematically showing a zoom lens system according to embodiment 1 of the present invention at a telephoto end;
FIG. 4 is a schematic view showing a configuration of a zoom lens system according to embodiment 2 of the present invention;
fig. 5 schematically shows a defocus graph at the wide-angle end of a zoom lens according to embodiment 2 of the present invention;
FIG. 6 is a view schematically showing a defocus graph at the telephoto end in the zoom lens system according to embodiment 2 of the present invention;
FIG. 7 is a schematic view showing a structure of a zoom lens system according to embodiment 3 of the present invention;
fig. 8 schematically shows a defocus graph at the wide-angle end of a zoom lens according to embodiment 3 of the present invention;
fig. 9 schematically shows a defocus graph of the zoom lens of embodiment 3 of the present invention at the telephoto end.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
As shown in fig. 1, the zoom lens of the present invention 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 first zoom lens group G2 having negative optical power, an aperture stop STO, a second fixed lens group G3 having positive optical power, a second zoom lens group G4 having positive optical power, and a focus lens group G5 having positive optical power. The first zoom lens group G2 and the second zoom lens group G4 are movable along the optical axis direction for optical zooming of the zoom lens between the wide-angle end and the telephoto end, and the focus lens group G5 is also movable along the optical axis direction for compensating for the image plane position variation of the zoom lens during the optical zooming. Meanwhile, the focal length FG5 of the focus lens group G5 and the focal length FW at the wide-angle end of the zoom lens satisfy the relation: FG5/FW is not less than 4.0 and not more than 5.0. The large multiplying power and the small size are compatible, and the resolution of the full-focus section of the lens can meet 4K.
By adopting a five-group structure of positive-negative-positive and three-group linkage mode of two-zoom and one-focus, the focal power and the focal length of the five-group and the shapes of the object side surface and the image side surface of each lens in the five-group are reasonably distributed, so that the zoom ratio of the zoom lens exceeds 25 times, and the maximum aperture can reach F1.6. Due to the reasonable design of the framework, the distortion of a large angle is effectively corrected, the maximum optical distortion of a full-focus section is less than 5%, and an imaging picture is uniform and undistorted. The high zoom ratio, wide angle and low distortion are realized, and the resolution of a full focal length section is ensured to reach 4K imaging.
In the present invention, the focal length FG1 of the first fixed lens group G1, the focal length FG2 of the first zoom lens group G2, and the focal length FG4 of the second zoom lens group G4 satisfy the following relationships, respectively:
8.5≤FG1/FW≤10.5；
-2.5≤FG2/FW≤-1.5；
4.2≤FG4/FW≤5.0；
where FW is a focal length at the wide-angle end of the zoom lens.
In the present invention, the first fixed lens group G1 includes, in order along the optical axis from the object side to the image side: a first lens L1 having a negative power, a second lens L2 having a positive power, a third lens L3 having a positive power, and a fourth lens L4 having a positive power. The object-side surface of the first lens L1 is convex, the image-side surface is concave, and the object-side surfaces of the second lens L2, the third lens L3 and the fourth lens L4 are convex.
In the present invention, the first zoom lens group G2 includes, in order along the optical axis from the object side to the image side: a fifth lens L5 having a negative power, a sixth lens L6 having a negative power, a seventh lens L7 having a negative power, and an eighth lens L8 having a positive power. The image side surfaces of the fifth lens L5 and the sixth lens L6 are concave, the object side surface and the image side surface of the seventh lens L7 are concave, and the object side surface and the image side surface of the eighth lens L8 are convex.
In the present invention, the second fixed lens group G3 includes, in order from the object side to the image side along the optical axis: a ninth lens L9 having positive optical power and a tenth lens L10 having negative optical power. Both the object-side surface and the image-side surface of the ninth lens L9 are convex.
In the present invention, the second zoom lens group G4 includes, in order along the optical axis from the object side to the image side: an eleventh lens L11 having positive power, a twelfth lens L12 having negative power, a thirteenth lens L13 having positive power, a fourteenth lens L14 having positive power, and a fifteenth lens L15 having negative power. The object-side surface and the image-side surface of the eleventh lens L11 are both convex, the object-side surfaces of the thirteenth lens L13 and the fourteenth lens L14 are both convex, and the image-side surface of the fifteenth lens L15 is concave.
In the present invention, the focus lens group G5 includes, in order along the optical axis from the object side to the image side: a sixteenth lens L16 having positive or negative power, a seventeenth lens L17 having positive or negative power, and an eighteenth lens L18 having positive or negative power.
In the present invention, the zoom lens includes at least one glass aspheric lens. Through the combination of the spherical lens and the aspherical lens, various aberrations of the zoom lens are effectively corrected, and the resolution is improved. Through reasonable distribution of focal power of 18 lenses and selection of specific glass materials, chromatic aberration of the lens is corrected, purple sides of a full focal section are smaller than 4 pixel points, and a good imaging effect is achieved. In addition, the specific focal power of the five groups determined by the focal power of each lens in the five lens groups can effectively correct the tolerance of the lens elements and has good assembly processability.
In the present invention, the first lens L1 and the second lens L2 are cemented to form a double cemented lens. The seventh lens L7 and the eighth lens L8 are cemented together to form a double cemented lens. The combination of the double-cemented lens can effectively correct chromatic aberration, improve the resolution of the zoom lens and enable the lens to have good assembly.
In the present invention, the material abbe number Ab2 of the second lens L2, the material abbe number Ab3 of the third lens L3, and the material abbe number Ab4 of the fourth lens L4 satisfy the following relations, respectively: ab2 is more than or equal to 70; ab3 is more than or equal to 70; ab4 is more than or equal to 65. By designing and combining different dispersion coefficients of the second lens L2 to the fourth lens L4, the chromatic aberration at the telephoto end of the zoom lens can be effectively corrected, and the resolution is further improved.
The abbe number Ab7 of the material of the seventh lens L7 satisfies the relation: ab7 is more than or equal to 70, and Ab13 of the material of the thirteenth lens L13 satisfies the relation: ab13 is more than or equal to 70. The dispersion coefficients of the seventh lens L7 and the thirteenth lens L13 are designed, so that chromatic aberration of the zoom lens is effectively corrected, and imaging resolution is improved. The abbe number Ab14 of the material of the fourteenth lens L14 satisfies the relationship: ab14 is less than or equal to 25, and can effectively correct chromatic aberration and reduce purple fringing.
In the present invention, the stroke D2 of the first zoom lens group G2 and the stroke D4 of the second zoom lens group G4 satisfy the relationship: the absolute value of D2/D4 is more than or equal to 1.5 and less than or equal to 2.0. The focal length FG2 of the first zoom lens group G2 and the focal length FG4 of the second zoom lens group G4 satisfy the relation: FG2/FG4 is less than or equal to-0.46 and less than or equal to-0.30. By designing and combining the stroke ratios and the focal length ratios of the first zoom lens group G2 and the second zoom lens group G4, the zoom lens can achieve compatibility of a large magnification with miniaturization and a small volume.
In the present invention, the maximum lens diameter Φ G1 of the first fixed lens group G1 and the total length TTL of the zoom lens satisfy the relation: phi G1/TTL is less than or equal to 0.4. By defining the ratio of the maximum lens diameter Φ G1 and the total lens optical length TTL of the first fixed lens group G1 and the range thereof, the volume of the zoom lens can be further made more compact.
The zoom lens is specifically described below in three specific embodiments. In the following specific embodiments, the object side surface is denoted as OBJ, the image side surface is denoted as IMA, the aperture stop STO is denoted as one surface, and the cemented surface of the cemented lens group is denoted as one surface, for example, 3 surfaces are shared by a double cemented lens consisting of 2 cemented lenses.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
In the present invention, the aspherical lens of the zoom lens satisfies the following formula:
in the above formula, z is the axial distance from the curved surface to the vertex at the position 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 the conic constant of the surface; a. the4、A6、A8、A10、A12、A14、A16The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
Example 1
The parameters of each lens of the zoom lens of the present embodiment include: surface type, radius of curvature (R-value), thickness, refractive index of the material, abbe number, as shown in table 2 below:
TABLE 2
The aspheric coefficients of the aspheric lenses of the zoom lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10As shown in table 3 below.
| Number of noodles | K | A4 | A6 | A8 | A10 |
| S19 | -0.4322 | 7.7895E-06 | 6.6729E-08 | -1.7356E-10 | 2.9912E-12 |
| S20 | -50.0000 | 5.6066E-06 | 1.2233E-07 | -1.1760E-09 | 4.9353E-12 |
| S32 | -15.0000 | 6.6446E-04 | -2.0923E-06 | 2.2941E-09 | -1.1651E-10 |
| S33 | 0.0000 | 3.6622E-04 | -1.3276E-07 | 1.2956E-08 | -1.3319E-10 |
TABLE 3
The wide-angle end and telephoto end magnification variation data of the zoom lens of the present embodiment are as shown in table 4 below.
| Wide angle end | Telescope end | |
| T1 | 0.8 | 40.8 |
| T2 | 40.5 | 0.5 |
| T3 | 23.2 | 1.5 |
| T4 | 2.8 | 11.8 |
| T5 | 2.9 | 15.6 |
TABLE 4
Referring to fig. 1 to 3, in combination with tables 1 to 4, in the present embodiment, the zoom lens employs a total of 18 lenses. One of the lenses is a glass aspheric lens, and the other lens is a plastic aspheric lens. The aperture of the wide-angle end of the lens can reach 1.6, the zoom ratio exceeds 25 times, the chromatic aberration of position and the chromatic aberration of magnification are effectively corrected, the purple fringing effect is good, the maximum distortion is less than 5%, the lens does not have virtual focus in the temperature range of minus 30 ℃ to plus 70 ℃, and the full focal length resolution is 4K. The zoom lens realizes wide angle, low distortion, small size, large aperture and small temperature drift, and is suitable for various scenes. The zoom lens has good assembly tolerance while keeping good optical performance, is beneficial to production and assembly, and has high production yield. Fig. 2 to 3 reflect the above performance of the zoom lens of the present embodiment.
Example 2
The parameters of each lens of the zoom lens of the present embodiment include: surface type, radius of curvature (R-value), thickness, refractive index of the material, abbe number, as shown in table 5 below:
TABLE 5
The aspheric coefficients of the aspheric lenses of the zoom lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10As shown in table 6 below.
| Number of noodles | K | A4 | A6 | A8 | A10 |
| S20 | 0.3843 | -2.8584E-05 | 6.7744E-08 | 3.7630E-10 | 2.4369E-12 |
| S21 | 0.0000 | 1.8646E-05 | -7.5123E-08 | 9.1830E-10 | 0.0000E+00 |
| S34 | 0.0000 | -5.2341E-06 | -2.8625E-07 | 0.0000E+00 | 0.0000E+00 |
| S35 | 0.0000 | 5.8761E-05 | 3.3359E-08 | 0.0000E+00 | 0.0000E+00 |
TABLE 6
The wide-angle end and telephoto end magnification variation data of the zoom lens of the present embodiment are as shown in table 7 below.
| Wide angle end | Telescope end | |
| T1 | 0.8 | 38.8 |
| T2 | 39 | 1 |
| T3 | 23 | 1.5 |
| T4 | 3.1 | 19.4 |
| T5 | 4.7 | 9.9 |
TABLE 7
Referring to fig. 4 to 6, in combination with tables 1 and 5 to 7, in the present embodiment, the zoom lens employs a total of 18 lenses. Wherein the two lenses are glass aspheric lenses. The aperture of the wide-angle end of the zoom lens can reach 1.6, the zoom ratio exceeds 25 times, the chromatic aberration of the correcting position and the chromatic aberration of the magnification are good, the purple edge effect is good, virtual focus is not generated within the temperature range of minus 30 ℃ to plus 70 ℃, the maximum distortion is less than 5%, and the resolution of the full focal length is 4K. The lens has small size, large aperture and small temperature drift, and is suitable for various scenes. Fig. 5 to 6 reflect the above performance of the zoom lens of the present embodiment.
Example 3
The parameters of each lens of the zoom lens of the present embodiment include: surface type, radius of curvature (R-value), thickness, refractive index of the material, abbe number, as shown in table 8 below:
TABLE 8
The aspherical surface coefficients of the aspherical lenses of the zoom lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10As shown in table 9 below.
| Number of noodles | K | A4 | A6 | A8 | A10 |
| S20 | 0.2691 | -2.2796E-05 | -1.0064E-07 | 6.3012E-10 | -1.8090E-12 |
| S21 | -0.6044 | 1.4078E-05 | -1.2716E-07 | 1.4510E-09 | -5.1881E-12 |
| S34 | 4.8248 | -1.6030E-05 | -1.2930E-06 | 3.1875E-08 | -6.8574E-10 |
| S35 | 1.3958 | 1.1694E-04 | -2.3764E-07 | 2.5964E-08 | -5.0508E-10 |
TABLE 9
The wide-angle end and telephoto end magnification variation data of the zoom lens of the present embodiment are as shown in table 10 below.
Watch 10
Referring to fig. 7 to 9, in combination with tables 1 and 8 to 10, in the present embodiment, the zoom lens employs a total of 18 lenses. One of the lenses is a glass aspheric lens, and the other lens is a plastic aspheric lens. The aperture of the wide-angle end of the zoom lens can reach 1.6, the zoom ratio exceeds 25 times, the maximum distortion is less than 4%, the chromatic aberration of correction positions and the chromatic aberration of magnification are good, the purple edge effect is good, virtual focus is not generated within the temperature range of minus 30 ℃ to plus 70 ℃, and the resolution of a full focal length is 4K. The lens has the advantages of small size, wide angle, low distortion, large aperture and small temperature drift, and is suitable for various scenes. Fig. 8 to 9 reflect the above performance of the zoom lens of the present embodiment.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (20)
1. 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 first zoom lens group (G2) having negative optical power, an aperture Stop (STO), a second fixed lens group (G3) having positive optical power, a second zoom lens group (G4) having positive optical power, and a focus lens group (G5) having positive optical power, the first zoom lens group (G2), the second zoom lens group (G4), and the focus lens group (G5) being movable in the optical axis direction,
a focal length (FG5) of the focus lens group (G5) and a focal length (FW) at a wide-angle end of the zoom lens satisfy the relation: FG5/FW is not less than 4.0 and not more than 5.0.
2. The zoom lens according to claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the first fixed lens group (G1) includes, in order, a first lens (L1) having negative optical power, a second lens (L2) having positive optical power, a third lens (L3) having positive optical power, and a fourth lens (L4) having positive optical power;
the first lens (L1) and the second lens (L2) are cemented to form a cemented lens.
3. The zoom lens according to claim 2,
the object side surface of the first lens (L1) is convex, and the image side surface of the first lens is concave;
the object sides of the second lens (L2), the third lens (L3), and the fourth lens (L4) are all convex.
4. A zoom lens according to claim 2, wherein the abbe number (Ab) of the material of the second lens (L2)2) And Abbe number (Ab) of material of the third lens (L3)3) And Abbe number (Ab) of material of the fourth lens (L4)4) Satisfy the relational expression respectively: ab2≥70；Ab3≥70；Ab4≥65。
5. The zoom lens according to claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the first zoom lens group (G2) includes, in order, a fifth lens (L5) having negative optical power, a sixth lens (L6) having negative optical power, a seventh lens (L7) having negative optical power, and an eighth lens (L8) having positive optical power.
6. The zoom lens according to claim 5,
the image side surfaces of the fifth lens (L5) and the sixth lens (L6) are both concave;
the object side surface and the image side surface of the seventh lens (L7) are both concave;
the object side and the image side of the eighth lens (L8) are both convex.
7. A zoom lens according to claim 5, wherein the seventh lens (L7) and the eighth lens (L8) are cemented to form a double cemented lens.
8. A zoom lens according to claim 5, wherein the Abbe number (Ab) of the material of the seventh lens (L7)7) Satisfy the relation: ab7≥70。
9. The zoom lens according to claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the second fixed lens group (G3) includes, in order, a ninth lens (L9) having positive optical power and a tenth lens (L10) having negative optical power.
10. The zoom lens according to claim 9, wherein both the object-side surface and the image-side surface of the ninth lens (L9) are convex.
11. The zoom lens according to claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the second zoom lens group (G4) includes, in order, an eleventh lens (L11) having positive optical power, a twelfth lens (L12) having negative optical power, a thirteenth lens (L13) having positive optical power, a fourteenth lens (L14) having positive optical power, and a fifteenth lens (L15) having negative optical power.
12. The zoom lens according to claim 11,
the object side surface and the image side surface of the eleventh lens (L11) are both convex;
the object sides of the thirteenth lens (L13) and the fourteenth lens (L14) are both convex;
an image side surface of the fifteenth lens (L15) is concave.
13. A zoom lens according to claim 11, wherein the material abbe number (Ab) of the thirteenth lens (L13)13) Satisfy the relation: ab13≥70。
14. A zoom lens according to claim 11, wherein the material abbe number (Ab) of the fourteenth lens (L14)14) Satisfy the relation: ab14≤25。
15. The zoom lens according to claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the focusing lens group (G5) includes, in order, a sixteenth lens (L16) having positive or negative optical power, a seventeenth lens (L17) having positive or negative optical power, and an eighteenth lens (L18) having positive or negative optical power.
16. The zoom lens according to any one of claims 1 to 15,
a focal length (FG1) of the first fixed lens group (G1) satisfies the relationship: FG1/FW is more than or equal to 8.5 and less than or equal to 10.5;
a focal length (FG2) of the first zoom lens group (G2) satisfies the relation: FG2/FW is not less than-2.5 and not more than-1.5;
a focal length (FG4) of the second zoom lens group (G4) satisfies the relation: FG4/FW is more than or equal to 4.2 and less than or equal to 5.0;
wherein FW is a focal length at the wide-angle end of the zoom lens.
17. The zoom lens according to any one of claims 1 to 15, wherein the zoom lens comprises at least one glass aspherical lens.
18. A zoom lens according to any one of claims 1 to 15, wherein the stroke (D2) of the first zoom lens group (G2) and the stroke (D4) of the second zoom lens group (G4) satisfy the relation: the absolute value of D2/D4 is more than or equal to 1.5 and less than or equal to 2.0.
19. A zoom lens according to any one of claims 1 to 15, wherein the focal length (FG2) of the first zoom lens group (G2) and the focal length (FG4) of the second zoom lens group (G4) satisfy the relation: FG2/FG4 is less than or equal to-0.46 and less than or equal to-0.30.
20. The zoom lens according to any one of claims 1 to 15, wherein the maximum lens diameter (Φ G1) of the first fixed lens group (G1) and The Total Length (TTL) of the zoom lens satisfy the relation: phi G1/TTL is less than or equal to 0.4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123099026.0U CN216351505U (en) | 2021-12-10 | 2021-12-10 | Zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123099026.0U CN216351505U (en) | 2021-12-10 | 2021-12-10 | Zoom lens |
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| Publication Number | Publication Date |
|---|---|
| CN216351505U true CN216351505U (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123099026.0U Active CN216351505U (en) | 2021-12-10 | 2021-12-10 | Zoom lens |
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| CN (1) | CN216351505U (en) |
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- 2021-12-10 CN CN202123099026.0U patent/CN216351505U/en active Active
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