CN114895443A - Zoom lens - Google Patents
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- CN114895443A CN114895443A CN202210389494.1A CN202210389494A CN114895443A CN 114895443 A CN114895443 A CN 114895443A CN 202210389494 A CN202210389494 A CN 202210389494A CN 114895443 A CN114895443 A CN 114895443A
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- 238000003384 imaging method Methods 0.000 abstract description 4
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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
- G02B15/145—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 five groups only
- G02B15/1451—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 five groups only the first group being positive
- G02B15/145129—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 five groups only the first group being positive arranged +-+++
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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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
-
- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
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Abstract
The invention relates to a zoom lens, which comprises a first fixed lens group with positive focal power, a zoom lens group with negative focal power, a diaphragm, a second fixed lens group with positive focal power, a focusing lens group with positive focal power and a third fixed lens group with positive focal power, wherein the first fixed lens group with positive focal power, the zoom lens group with negative focal power, the diaphragm, the second fixed lens group with positive focal power, the focusing lens group with positive focal power and the third fixed lens group with positive focal power are sequentially arranged along an optical axis from an object side to an image side; the zoom lens group can move along an optical axis for optical zooming of the zoom lens between a wide-angle end and a telephoto end, the focus lens group can move along the optical axis for compensating image plane position variation in the optical zooming process, and the ratio of the focal length FG4 of the focus lens group to the focal length FW of the zoom lens at the wide-angle end satisfies the following relation: 4.40 < FG4/FW < 5.20. The zoom lens adopts a five-group structure of 'positive-negative-positive', can realize a zoom ratio of more than 11 times, meets the performance requirements of wide angle, low distortion, large aperture and high resolution, and can realize full-focus 4K imaging.
Description
Technical Field
The invention relates to the field of optical imaging, in particular to a zoom lens.
Background
At the present stage, video conference office has already become a high-efficiency critical office communication collaboration method, and a network camera is an indispensable productivity tool. With the introduction of the rigid demand of video conferences, higher requirements are put on video-type shots. Most of the existing video lenses are fixed-focus lenses, the resolution of another zoom lens is 2M or 4M level, the field angle is limited, the resolution is not high, the market demand cannot be met, and the market needs stronger and clearer actual image effect.
Disclosure of Invention
The present invention is directed to solve the above problems, and an object of the present invention is to provide a zoom lens which has a horizontal field angle of 80 °, a maximum aperture of 1.65, a high resolution, and a clear image even at high and low temperatures.
To achieve the above object, the present invention provides a zoom lens, comprising a first fixed lens group having positive optical power, a zoom lens group having negative optical power, a 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, which are arranged in order from an object side to an image side along an optical axis; the zoom lens group is movable along an optical axis for optical zooming of the zoom lens between a wide-angle end and a telephoto end, the focus lens group is movable along the optical axis for compensating for image plane position variation during optical zooming, and a ratio of a focal length FG4 of the focus lens group to a focal length FW of the zoom lens at the wide-angle end satisfies the following relationship: 4.40 < FG4/FW < 5.20.
According to an aspect of the present invention, the first fixed lens group includes, in order from an object side to an image side: the optical lens assembly includes a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, and a fourth lens having positive refractive power, and the first lens and the second lens are cemented lenses.
According to an aspect of the invention, the radius of curvature of the object side surface of the first lens R1 and the focal length of the first lens F1 satisfy the following relationship: 12.0 < | R1/F1| < 24.0.
According to an aspect of the invention, the abbe number ABB2 of the second lens is in the range 65< ABB2< 100.
According to an aspect of the present invention, the maximum aperture SD1 of the first lens and the maximum angle of view FOV of the zoom lens satisfy the following relationship: 0.78 < SD1/FOV < 0.88.
According to an aspect of the present invention, the zoom lens group includes, in order from an object side to an image side: the zoom lens includes a fifth lens having negative refractive power, a sixth lens having negative refractive power, a seventh lens having negative refractive power, an eighth lens having positive refractive power, and a ninth lens having negative refractive power.
According to an aspect of the present invention, the second fixed lens group includes, in order from an object side to an image side: a tenth lens having positive refractive power, an eleventh lens having positive refractive power, and a twelfth lens having negative refractive power.
According to an aspect of the present invention, the focus lens group includes, in order from an object side to an image side: the optical lens assembly includes a thirteenth lens having positive refractive power, a fourteenth lens having positive refractive power, a fifteenth lens having positive refractive power, and a sixteenth lens having negative refractive power, wherein the fifteenth lens and the sixteenth lens are cemented lenses.
According to an aspect of the present invention, a refractive index IND15 of the fifteenth lens and a refractive index IND16 of the sixteenth lens satisfy the following relationship: 0.02 < IND16-IND15 < 0.08.
According to an aspect of the present invention, the third fixed lens group includes, in order from the object side to the image side: a seventeenth lens having a negative refractive power, an eighteenth lens having a positive refractive power, and a nineteenth lens having a negative refractive power or a positive refractive power.
According to an aspect of the present invention, a center thickness CT10 of the tenth lens on the optical axis, a center thickness CT12 of the twelfth lens on the optical axis, a center thickness CT18 of the eighteenth lens on the optical axis, and a center thickness CT19 of the nineteenth lens on the optical axis satisfy the following relationship: 7.0 < CT10+ CT12+ CT18+ CT19 < 8.3.
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 six aspheric lenses, including at least four plastic aspheric lenses, and both surfaces of the aspheric lenses are aspheric surfaces.
According to an aspect of the present invention, the zoom lens group, the second fixed lens group, and the focus lens group include at least two glass aspheric lenses, and both surfaces of the glass aspheric lenses are aspheric.
According to one aspect of the invention, the aperture value Fno of the zoom lens in any zoom state satisfies the following relationship: fno more than 1.65 is less than or equal to 3.7.
According to an aspect of the present invention, a focal length FG1 of the first fixed lens group and a focal length FW at the wide-angle end of the zoom lens satisfy the following relationship: 12.20 < FG1/FW < 14.10.
According to an aspect of the present invention, a focal length FG2 of the zoom lens group and a focal length FW at the wide-angle end of the zoom lens satisfy the following relationship: -2.20 < FG2/FW < -1.90.
According to an aspect of the present invention, a focal length FG3 of the second fixed lens group and a focal length FW at the wide-angle end of the zoom lens satisfy the following relationship: 9.60 < FG3/FW < 13.10.
According to an aspect of the present invention, a focal length FG5 of the third fixed lens group and a focal length FW at the wide-angle end of the zoom lens satisfy the following relationship: 7.20 < FG5/FW < 10.10.
According to an aspect of the present invention, the stroke D2 of the zoom lens group and the total length TTL of the zoom lens satisfy the following relationship:
0.24＜|D2/TTL|＜0.30。
according to an aspect of the present invention, the stroke D4 of the focus lens group and the stroke D2 of the zoom lens group satisfy the following relationship: 0.36 < | D4/D2| < 0.45.
According to one aspect of the invention, the focal length FG4 of the focus lens group and the focal length FG2 of the zoom lens group satisfy the following relationship: -2.70 < FG4/FG 2< -2.0.
According to an aspect of the present invention, the focal length FG2 of the zoom lens group and the stroke D2 of the zoom lens group satisfy the following relationship: 0.31 < FG2/| Δ D2| < -0.27.
According to one aspect of the invention, the focal length FG4 of the focus lens group and the stroke D4 of the focus lens group satisfy the following relationship: 1.50 < FG4/| D4| < 2.0.
According to an aspect of the present invention, a focal length FW of the zoom lens at the wide end position and a focal length FT of the zoom lens at the telephoto end position satisfy: 11.50 < FT/FW < 12.30.
According to one scheme of the invention, the zoom lens adopts a five-group structure of 'positive-negative-positive', can realize a zoom ratio of more than 11 times, meets the performance requirements of wide angle, low distortion, large aperture and high resolution, and can realize full-focus 4K imaging.
According to one aspect of the invention, good resolution is ensured at high and low temperatures, as well, by reasonable power distribution and selection of specific glass materials.
According to one aspect of the present invention, tolerance sensitivities of the zoom lens group, the focus lens group, and the entire zoom lens system can be adjusted by reasonably setting a relationship between a focal length of the focus lens group and a focal length of the zoom lens group.
According to one scheme of the invention, the plastic aspheric surface is reasonably used, so that the manufacturing cost of the lens is reduced, the product competitiveness is improved, and the weight of the lens can be reduced, and the lens is convenient to carry.
According to one scheme of the invention, the mutual relation among the moving stroke of the zoom lens group along the optical axis, the moving stroke of the focusing lens group along the optical axis and the total optical length of the zoom lens is reasonably set, so that the moving stroke of the lens group is shorter, the response speed is higher, and the functions of quickly responding to zooming and focusing are realized.
According to one scheme of the invention, high relative illumination can be realized through reasonable arrangement of the focal power, the focal length and the central thickness of the lens, so that the lens can uniformly collect energy of each view field angle.
According to one scheme of the invention, the abbe number, the refractive index and the center thickness of the lens are reasonably set, so that the chromatic aberration of the system can be corrected.
Drawings
FIG. 1 is a schematic view showing a configuration of a zoom lens according to embodiment 1 of the present invention;
fig. 2 schematically shows an MTF chart of a zoom lens according to embodiment 1 of the present invention at a wide-angle end;
FIG. 3 is a schematic view showing an MTF chart at the telephoto end of the lens in a zoom lens according to embodiment 1 of the present invention;
FIG. 4 is a view schematically showing a low temperature-40 ℃ defocus curve of a zoom lens according to embodiment 1 of the present invention at the wide-angle end;
fig. 5 schematically shows a high temperature +80 ℃ defocus curve of a zoom lens according to embodiment 1 of the present invention at the wide-angle end of the lens;
FIG. 6 is a view schematically showing a low temperature-40 ℃ defocus graph of a zoom lens according to embodiment 1 of the present invention at the telephoto end of the lens;
FIG. 7 schematically shows a high temperature +80 ℃ defocus plot of a zoom lens according to embodiment 1 of the present invention at the telephoto end of the lens;
FIG. 8 is a schematic view showing a structure of a zoom lens according to embodiment 2 of the present invention;
fig. 9 schematically shows an MTF chart of a zoom lens according to embodiment 2 of the present invention at the wide-angle end;
FIG. 10 schematically shows an MTF chart at the telephoto end of the lens for a zoom lens according to embodiment 2 of the present invention;
fig. 11 schematically shows a low temperature-40 ℃ defocus graph of a zoom lens according to embodiment 2 of the present invention at the wide-angle end;
fig. 12 schematically shows a high temperature +80 ℃ defocus graph of a zoom lens according to embodiment 2 of the present invention at the wide-angle end;
FIG. 13 is a view schematically showing a low temperature-40 ℃ defocus graph of a zoom lens according to embodiment 2 of the present invention at the telephoto end of the lens;
FIG. 14 schematically shows a high temperature +80 ℃ defocus plot for a zoom lens according to embodiment 2 of the present invention at the telephoto end of the lens;
FIG. 15 is a schematic view showing a structure of a zoom lens according to embodiment 3 of the present invention;
fig. 16 schematically shows an MTF chart of a zoom lens according to embodiment 3 of the present invention at the wide-angle end;
fig. 17 schematically shows an MTF chart at the telephoto end of the lens for a zoom lens according to embodiment 3 of the present invention;
FIG. 18 is a view schematically showing a low temperature-40 ℃ defocus curve of a zoom lens according to embodiment 3 of the present invention at the wide-angle end;
fig. 19 schematically shows a high temperature +80 ℃ defocus graph of a zoom lens according to embodiment 3 of the present invention at the wide-angle end;
FIG. 20 is a schematic view showing a low temperature-40 ℃ defocus graph of a zoom lens according to embodiment 3 of the present invention at the telephoto end of the lens;
FIG. 21 schematically shows a high temperature +80 ℃ defocus plot of a zoom lens according to embodiment 3 of the present invention at the telephoto end of the lens.
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 invention, 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, a 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 zoom lens group G2 having negative optical power, a 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 is movable along an optical axis for optical zooming of the zoom lens between a wide-angle end and a telephoto end, the focus lens group is movable along the optical axis for compensating for image plane position variations during the optical zooming, and a ratio of a focal length FG4 of the focus lens group G4 to a focal length FW at the wide-angle end of the zoom lens satisfies the following relationship: 4.40 < FG4/FW < 5.20; by adopting a five-group framework of 'positive-negative-positive', the zoom ratio exceeding 11 times is realized, the performance requirements of wide angle, low distortion, large aperture and high resolution are met, and the full-focus 4K imaging is realized.
In the invention, the aperture value Fno of the zoom lens in any zooming state satisfies the following conditions: fno more than 1.65 is less than or equal to 3.7.
In the present invention, the first fixed lens group G1 includes, in order from the object side to the image side: a first lens L1 having negative refractive power, a second lens L2 having positive refractive power, a third lens L3 having positive refractive power, and a fourth lens L4 having positive refractive power, wherein the first lens L1 and the second lens L2 are cemented lenses; the zoom lens group G2 includes, in order from the object side to the image side: a fifth lens L5 having negative refractive power, a sixth lens L6 having negative refractive power, a seventh lens L7 having negative refractive power, an eighth lens L8 having positive refractive power, and a ninth lens L9 having negative refractive power; the second fixed lens group G3 includes, in order from the object side to the image side: a tenth lens L10 having positive refractive power, an eleventh lens L11 having positive refractive power, and a twelfth lens L12 having negative refractive power; the focus lens group G4 includes, in order from the object side to the image side: a thirteenth lens L13 having positive refractive power, a fourteenth lens L14 having positive refractive power, a fifteenth lens L15 having positive refractive power, and a sixteenth lens L16 having negative refractive power, the fifteenth lens L15 and the sixteenth lens L16 being cemented lenses; the third fixed lens group G5 includes, in order from the object side to the image side: a seventeenth lens L17 having negative optical power, an eighteenth lens L18 having positive optical power, and a nineteenth lens L19 having negative optical power or positive optical power.
In the present invention, the zoom lens group G2, the second fixed lens group G3, the focus lens group G4, and the third fixed lens group G5 at least include 6 aspheric lenses, which include at least four plastic aspheric lenses, and both surfaces of the aspheric lenses are aspheric.
In the present invention, the zoom lens group G2, the second fixed lens group G3, and the focus lens group G4 at least include 2 glass aspheric lenses, and both surfaces of the glass aspheric lenses are aspheric.
Through reasonable focal power distribution and specific glass material selection, guaranteed that zoom also has good solution under high low temperature condition, through the rational use plastic aspheric surface, on the one hand for the cost of manufacture of camera lens can reduce, has improved product competitiveness, and on the other hand can reduce camera lens weight, portable.
In the present invention, the focal length FG4 of the focus lens group G4 and the focal length FG2 of the zoom lens group G2 satisfy the following relationship: -2.70 < FG4/FG 2< -2.0.
By reasonably setting the relationship between the focal length of the focusing lens group and the focal length of the zooming lens group, the tolerance sensitivity of the zooming lens group, the focusing lens group and the whole zooming lens system can be adjusted.
In the present invention, the focal length FG1 of the first fixed lens group G1 and the focal length FW at the wide-angle end of the zoom lens satisfy the following relationship: 12.20 < FG1/FW < 14.10; the focal length FG2 of the zoom lens group G2 and the focal length FW at the wide-angle end of the zoom lens satisfy the following relationship: -2.20 < FG2/FW < -1.90; the focal length FG3 of the second fixed lens group G3 and the focal length FW at the wide-angle end of the zoom lens satisfy the following relationship: 9.60 < FG3/FW < 13.10; the focal length FG5 of the third fixed lens group G5 and the focal length FW at the wide-angle end of the zoom lens satisfy the following relationship: 7.20 < FG5/FW < 10.10; the focal length FW of the zoom lens at the wide-angle end position and the focal length FT of the zoom lens at the telephoto end position satisfy: 11.50 < FT/FW < 12.30.
In the present invention, the stroke D2 of the zoom lens group G2 and the total length TTL of the zoom lens satisfy the following relationship: 0.24 < | D2/TTL | < 0.30; the stroke D4 of the focus lens group G4 and the stroke D2 of the zoom lens group G2 satisfy the following relationship: 0.36 < | D4/D2| < 0.45.
In the present invention, the focal length FG2 of the zoom lens group G2 and the stroke D2 of the zoom lens group G2 satisfy the following relationship: -0.31 < FG2/| D2| < -0.27; the focal length FG4 of the focus lens group G4 and the stroke D4 of the focus lens group G4 satisfy the following relationship: 1.50 < FG4/| D4| < 2.0.
By reasonably setting the mutual relation among the moving stroke of the zoom lens group along the optical axis, the moving stroke of the focusing lens group along the optical axis and the total optical length of the zoom lens, the moving stroke of the lens group is shorter, the response speed is higher, and the functions of quickly responding to zooming and focusing are realized.
In the present invention, the radius of curvature R1 of the object-side surface of the first lens L1 and the focal length F1 of the first lens L1 satisfy: 12.0 < | R1/F1| < 24.0.
In the present invention, the central thickness CT10 of the tenth lens L10 on the optical axis, the central thickness CT12 of the twelfth lens L12 on the optical axis, the central thickness CT18 of the eighteenth lens on the optical axis, and the central thickness CT19 of the nineteenth lens on the optical axis satisfy the following relationships:
7.0＜CT10+CT12+CT18+CT19＜8.3。
in the present invention, the refractive index IND15 of the fifteenth lens L15 and the refractive index IND16 of the sixteenth lens L16 satisfy the following relational expressions: 0.02 < IND16-IND15 < 0.08; the abbe number ABB2 of the second lens L2 ranges from 65< ABB2< 100; the maximum aperture SD1 of the first lens L1 and the maximum field angle FOV of the zoom lens satisfy the following relational expression: 0.78 < SD1/FOV < 0.88.
The abbe number, the refractive index and the central thickness of the lens are reasonably set, so that chromatic aberration of a system can be corrected, and meanwhile, high relative illumination can be realized through reasonable setting of focal power and focal length, so that the lens can uniformly collect energy of each view field angle.
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 formula, z is the axial distance from the curved surface to the vertex at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; 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 … … are aspheric coefficients of fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth order … …, 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
In this example, the aspheric data is shown in Table 3 below, where K is the conic constant of the surface and A 4 、A 6 、A 8 、A 10 、A 12 Aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order respectively:
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 | Long coke end | |
| T1 | 0.88 | 34.26 |
| T2 | 35.06 | 1.68 |
| T3 | 14.68 | 1.73 |
| T4 | 2.40 | 15.35 |
TABLE 4
Referring to fig. 1 to 7, in combination with tables 1 to 4, in the present embodiment, the zoom lens uses a total of 19 lenses, which realizes a maximum aperture of 1.8, a zoom ratio exceeding 12 times, a wide angle and a low distortion, and satisfies a full-focus 4K resolution optical zoom.
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
In this example, the aspheric data is shown in Table 6 below, where K is the conic constant of the surface and A 4 、A 6 、A 8 、A 10 、A 12 Aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order respectively:
table 6 the wide angle end and telephoto end magnification variation data of the zoom lens of this embodiment are as shown in table 7 below.
| Wide angle end | Long coke end | |
| T1 | 0.89 | 36.83 |
| T2 | 37.54 | 1.6 |
| T3 | 16.76 | 1.62 |
| T4 | 2.51 | 17.65 |
TABLE 7
Referring to fig. 8 to 14, in combination with tables 1 and 5 to 7, in the present embodiment, the zoom lens employs a total of 19 lenses, where 7 aspheric lenses are used, the aperture at the wide-angle end of the lens can reach 1.65, the aperture at the large aperture, the wide angle and the distortion are low, the resolution of all 4K is satisfied, the high and low temperature performance is good, and the illumination is high.
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
In this example, the aspheric data is shown in Table 9 below, where K is the conic constant of the surface, A 4 、A 6 、A 8 、A 10 、A 12 Aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order respectively:
TABLE 9
The wide angle end and telephoto end magnification variation data of the zoom lens of the present embodiment are shown in table 10 below.
| Wide angle end | Long coke end | |
| T1 | 0.88 | 34.52 |
| T2 | 35.25 | 1.61 |
| T3 | 15.14 | 1.1 |
| T4 | 2.35 | 16.39 |
Referring to fig. 15 to 21, in combination with tables 1 and 8 to 10, in the present embodiment, the zoom lens employs 19 lenses in total, wherein 6 aspheric lenses have a wide-angle aperture of 1.8, so that the wide-angle and distortion are low, and the full 4K resolution is satisfied, and the high-low temperature performance and the high illumination are good.
The invention discloses a zoom lens, which comprises a first fixed lens group with positive focal power, a zoom lens group with negative focal power, a diaphragm, a second fixed lens group with positive focal power, a focusing lens group with positive focal power and a third fixed lens group with positive focal power, wherein the first fixed lens group with positive focal power, the zoom lens group with negative focal power, the diaphragm, the second fixed lens group with positive focal power, the focusing lens group with positive focal power and the third fixed lens group with positive focal power are sequentially arranged along an optical axis from an object side to an image side; the zoom lens group can move along an optical axis for optical zooming of the zoom lens between a wide-angle end and a telephoto end, the focus lens group can move along the optical axis for compensating image plane position variation in the optical zooming process, and the ratio of the focal length FG4 of the focus lens group to the focal length FW of the zoom lens at the wide-angle end satisfies the following relation: 4.40 < FG4/FW < 5.20; the horizontal field angle of the zoom lens can reach 80 degrees, and the maximum aperture can reach 1.65 degrees. The video conference zoom lens realizes wide angle and low distortion through reasonable group combination, and has wide market application range; the resolution of the lens can reach 4K, and the contrast is high, so that the requirement of video signals is better met. Clear imaging quality can be ensured under high and low temperature states by reasonably distributing the focal power of the lens; the product competitiveness is improved.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is 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 (10)
1. A zoom lens comprising, arranged 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, a 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 an optical axis for optical zooming of the zoom lens between a wide-angle end and a telephoto end; the focusing lens group (G4) is movable along an optical axis for compensating for image plane position variation during optical zooming, and the ratio of the focal length FG4 of the focusing lens group (G4) to the focal length FW at the wide-angle end of the zoom lens satisfies the following relation: 4.40 < FG4/FW < 5.20.
2. The zoom lens according to claim 1, wherein the first fixed lens group (G1) comprises, in order from an object side to an image side: the optical lens assembly comprises a first lens (L1) with negative focal power, a second lens (L2) with positive focal power, a third lens (L3) with positive focal power and a fourth lens (L4) with positive focal power, wherein the first lens (L1) and the second lens (L2) are cemented lenses.
3. A zoom lens according to claim 2, wherein the radius of curvature R1 of the object side of the first lens (L1) and the focal length F1 of the first lens (L1) satisfy the following relationship: 12.0 < | R1/F1| < 24.0.
4. A zoom lens according to claim 2, wherein the abbe number ABB2 of the second lens (L2) ranges from 65< ABB2< 100.
5. The zoom lens according to claim 2, wherein a maximum aperture SD1 of the first lens (L1) and a maximum angle of view FOV of the zoom lens satisfy the following relationship: 0.78 < SD1/FOV < 0.88.
6. The zoom lens according to claim 1, wherein the zoom lens group (G2) comprises, in order from an object side to an image side: the zoom lens includes a fifth lens (L5) having negative optical power, a sixth lens (L6) having negative optical power, a seventh lens (L7) having negative optical power, an eighth lens (L8) having positive optical power, and a ninth lens (L9) having negative optical power.
7. The zoom lens according to claim 1, wherein the second fixed lens group (G3) comprises, in order from an object side to an image side: a tenth lens (L10) having positive refractive power, an eleventh lens (L11) having positive refractive power, and a twelfth lens (L12) having negative refractive power.
8. The zoom lens according to claim 1, wherein the focus lens group (G4) comprises, in order from an object side to an image side: the zoom lens comprises a thirteenth lens (L13) with positive focal power, a fourteenth lens (L14) with positive focal power, a fifteenth lens (L15) with positive focal power and a sixteenth lens (L16) with negative focal power, wherein the fifteenth lens (L15) and the sixteenth lens (L16) are cemented lenses.
9. The zoom lens according to claim 8, wherein a refractive index IND15 of the fifteenth lens (L15) and a refractive index IND16 of the sixteenth lens (L16) satisfy the following relationship: 0.02 < IND16-IND15 < 0.08.
10. The zoom lens according to claim 7, wherein the third fixed lens group (G5) comprises, in order from an object side to an image side: a seventeenth lens (L17) having negative optical power, an eighteenth lens (L8) having positive optical power, and a nineteenth lens (L19) having negative or positive optical power.
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| CN202210389494.1A CN114895443B (en) | 2022-04-13 | 2022-04-13 | Zoom lens |
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| CN202210389494.1A CN114895443B (en) | 2022-04-13 | 2022-04-13 | Zoom lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117130166A (en) * | 2023-10-26 | 2023-11-28 | 江西联昊光电有限公司 | Optical system and near-eye display device |
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| CN113126267A (en) * | 2021-05-21 | 2021-07-16 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN113534426A (en) * | 2021-07-30 | 2021-10-22 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN113534423A (en) * | 2021-07-15 | 2021-10-22 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114089521A (en) * | 2021-12-10 | 2022-02-25 | 舜宇光学(中山)有限公司 | Zoom lens |
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| JP2012063662A (en) * | 2010-09-17 | 2012-03-29 | Panasonic Corp | Zoom lens system, lens barrel, interchangeable lens device, and camera system |
| JP2018054990A (en) * | 2016-09-30 | 2018-04-05 | キヤノン株式会社 | Zoom lens and optical instrument having the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117130166A (en) * | 2023-10-26 | 2023-11-28 | 江西联昊光电有限公司 | Optical system and near-eye display device |
| CN117130166B (en) * | 2023-10-26 | 2024-03-15 | 江西联昊光电有限公司 | Optical system and near-eye display device |
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| CN114895443B (en) | 2024-03-19 |
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