CN114895443B - Zoom lens - Google Patents

Zoom lens Download PDF

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Publication number
CN114895443B
CN114895443B CN202210389494.1A CN202210389494A CN114895443B CN 114895443 B CN114895443 B CN 114895443B CN 202210389494 A CN202210389494 A CN 202210389494A CN 114895443 B CN114895443 B CN 114895443B
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China
Prior art keywords
lens
zoom lens
lens group
zoom
optical power
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CN202210389494.1A
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CN114895443A (en
Inventor
白兴安
陈瑶
应永茂
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Sunny Optics Zhongshan Co Ltd
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Sunny Optics Zhongshan Co Ltd
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Priority to CN202210389494.1A priority Critical patent/CN114895443B/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—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 +-+++
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

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 from an object side to an image side along an optical axis; the zoom lens group can move along the optical axis for optical zooming of the zoom lens between the wide-angle end and the telephoto end, the focusing lens group can move along the optical axis for compensating for the change of the image plane position in the optical zooming process, and the ratio of the focal length FG4 of the focusing lens group to the focal length FW of the wide-angle end of the zoom lens satisfies the following relationship: 4.40 < FG4/FW < 5.20. The zoom lens adopts a five-group architecture of positive-negative-positive, can realize a zoom ratio exceeding 11 times, meets the performance requirements of wide angle, low distortion, large aperture and high resolution, and can realize full-focal-length 4K imaging.

Description

Zoom lens
Technical Field
The invention relates to the field of optical imaging, in particular to a zoom lens.
Background
At present, video conference office has become a high-efficiency key office communication collaboration method, and a network camera is an essential productivity tool. Along with the introduction of video conference rigidity requirements, higher requirements are put on video-type lenses. The prior video lens is mostly a fixed focus lens, the resolution of the zoom lens is mostly 2M and 4M, the angle of view is limited, the resolution is not high, the market demand is not met, and the market needs stronger and clearer image practical effect.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a zoom lens which can achieve a horizontal angle of view of 80 °, a maximum aperture of 1.65, and a high resolution, and can clearly image even in a high-low temperature state.
In order to achieve the above object, the present invention provides a zoom lens including a first lens group having positive optical power, a zoom lens group having negative optical power, a stop, a second lens group having positive optical power, a focus lens group having positive optical power, and a third 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 and is used for optical zooming of the zoom lens between a wide-angle end and a telephoto end, the focusing lens group is movable along the optical axis and is used for compensating for the change of the image plane position in the optical zooming process, and the ratio of the focal length FG4 of the focusing lens group to the focal length FW of the wide-angle end of the zoom lens meets the following relation: 4.40 < FG4/FW < 5.20.
According to one aspect of the present invention, the first fixed lens group includes, in order from an object side to an image side: the lens 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, wherein the first lens and the second lens are cemented lenses.
According to one aspect of the present invention, the radius of curvature R1 of the object side surface of the first lens and the focal length F1 of the first lens satisfy the following relationship: 12.0 < |R1/F1| < 24.0.
According to one aspect of the invention, the second lens has an ABB number ABB2 in the range of 65< ABB2<100.
According to an aspect of the present invention, the maximum aperture SD1 of the first lens and the maximum field angle 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: a fifth lens having negative optical power, a sixth lens having negative optical power, a seventh lens having negative optical power, an eighth lens having positive optical power, and a ninth lens having negative optical 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 optical power, an eleventh lens having positive optical power, and a twelfth lens having negative optical power.
According to one aspect of the present invention, the focus lens group includes, in order from an object side to an image side: a thirteenth lens having positive optical power, a fourteenth lens having positive optical power, a fifteenth lens having positive optical power, and a sixteenth lens having negative optical power, wherein the fifteenth lens and the sixteenth lens are cemented lenses.
According to an aspect of the present invention, the refractive index IND15 of the fifteenth lens and the 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 an object side to an image side: a seventeenth lens having negative power, an eighteenth lens having positive power, and a nineteenth lens having negative or positive 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 one 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 aspherical lenses, wherein at least four plastic aspherical lenses are included, and both surfaces of the aspherical lenses are aspherical.
According to one aspect of the present invention, the zoom lens group, the second fixed lens group, and the focus lens group include at least two glass aspherical lenses, and both faces of the glass aspherical lenses are aspherical.
According to one aspect of the present invention, the aperture value Fno of the zoom lens in any zoom state satisfies the following relationship: fno <3.7 is more than or equal to 1.65.
According to an aspect of the present invention, a focal length FG1 of the first fixed lens group and a focal length FW of the wide-angle end of the zoom lens satisfy the following relationship: 12.20 < FG1/FW < 14.10.
According to one aspect of the present invention, a focal length FG2 of the zoom lens group and a focal length FW of 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 of the wide-angle end of the zoom lens satisfy the following relationship: FG3/FW is 9.60 < 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 of the wide-angle end of the zoom lens satisfy the following relationship: FG5/FW is 7.20 < 10.10.
According to one aspect of the invention, the travel D2 of the group of zoom lenses and the total length TTL of the zoom lenses satisfy the following relationship:
0.24＜|D2/TTL|＜0.30。
according to one 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 present invention, a focal length FG4 of the focus lens group and a focal length FG2 of the zoom lens group satisfy the following relationship: -2.70 < FG4/FG 2< -2.0.
According to one 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/|ΔD2| < -0.27.
According to one aspect of the present 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-angle 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 architecture of positive-negative-positive, can realize a zoom ratio exceeding 11 times, meets the performance requirements of wide angle, low distortion, large aperture and high resolution, and can realize full-focal-length 4K imaging.
According to one scheme of the invention, good resolution under high and low temperature conditions is ensured through reasonable focal power distribution and selection of specific glass materials.
According to an aspect of the present invention, tolerance sensitivity of the zoom lens group, the focus lens group, and the overall 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 the scheme, the plastic aspheric surface is reasonably used, so that on one hand, the manufacturing cost of the lens is reduced, the product competitiveness is improved, and on the other hand, the weight of the lens can be reduced, and the lens is convenient to carry.
According to the scheme of the invention, the movement stroke of the lens group is shorter and the response speed is faster by reasonably setting the interrelation of the movement stroke of the zoom lens group along the optical axis, the movement stroke of the focusing lens group along the optical axis and the optical total length of the zoom lens, thereby realizing the functions of quick response zooming and focusing.
According to one scheme of the invention, high relative illuminance can be realized through reasonable setting of the focal power, focal length and center 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 schematically shows a structural diagram of a zoom lens according to embodiment 1 of the present invention;
fig. 2 schematically shows an MTF diagram of the zoom lens according to embodiment 1 of the present invention at the wide-angle end of the lens;
fig. 3 schematically shows an MTF diagram of a zoom lens at a lens telephoto end according to embodiment 1 of the present invention;
fig. 4 schematically shows a low temperature-40 ℃ defocus map of a zoom lens according to embodiment 1 of the present invention at the wide-angle end of the lens;
fig. 5 schematically shows a high temperature +80 ℃ defocus graph of a zoom lens according to embodiment 1 of the present invention at the wide-angle end of the lens;
FIG. 6 schematically shows a low temperature-40℃defocus curve 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 graph of a zoom lens according to embodiment 1 of the present invention at the lens' tele end;
fig. 8 schematically shows a structural diagram of a zoom lens according to embodiment 2 of the present invention;
fig. 9 schematically shows an MTF diagram of a zoom lens according to embodiment 2 of the present invention at a wide-angle end of the lens;
fig. 10 schematically shows an MTF diagram of a zoom lens at a lens telephoto end according to embodiment 2 of the present invention;
fig. 11 schematically shows a low temperature-40 ℃ defocus map of a zoom lens according to embodiment 2 of the present invention at the wide-angle end of the lens;
fig. 12 schematically shows a high temperature +80 ℃ defocus graph of the zoom lens according to embodiment 2 of the present invention at the wide-angle end of the lens;
FIG. 13 schematically shows 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 graph of a zoom lens according to embodiment 2 of the present invention at the lens' tele end;
fig. 15 schematically shows a structural diagram of a zoom lens according to embodiment 3 of the present invention;
fig. 16 schematically shows an MTF diagram of a zoom lens according to embodiment 3 of the present invention at a wide-angle end of the lens;
fig. 17 schematically shows an MTF diagram of a zoom lens at a lens telephoto end according to embodiment 3 of the present invention;
fig. 18 schematically shows a low temperature-40 ℃ defocus map of a zoom lens according to embodiment 3 of the present invention at the wide-angle end of the lens;
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 of the lens;
FIG. 20 schematically shows a low temperature-40℃defocus curve 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 graph 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 that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
In describing embodiments of the present invention, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in terms of orientation or positional relationship shown in the drawings for convenience of description and simplicity of description only, and do not denote or imply that the devices or elements in question must have a particular orientation, be constructed and operated in a particular orientation, so that the above terms are not to be construed as limiting the invention.
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail 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 a first fixed lens group G1 having positive power, a zoom lens group G2 having negative power, a stop STO, a second fixed lens group G3 having positive power, a focus lens group G4 having positive power, and a third fixed lens group G5 having positive power, which are arranged in order from an object side to an image side along an optical axis; the zoom lens group can move along the optical axis for optical zooming of the zoom lens between the wide-angle end and the telephoto end, the focusing lens group can move along the optical axis for compensating for the change of the image plane position in the optical zooming process, and the ratio of the focal length FG4 of the focusing lens group G4 to the focal length FW of the wide-angle end of the zoom lens satisfies the following relationship: FG4/FW is more than 4.40 and less than 5.20; by adopting a five-group architecture 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 full-focal-segment 4K imaging is realized.
In the present invention, the aperture value Fno of the zoom lens in any zoom state satisfies: fno <3.7 is more than or equal to 1.65.
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 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 being cemented lenses; the zoom lens group G2 includes, in order from the object side to the image side: 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; the second fixed lens group G3 includes, in order from the object side to the image side: a tenth lens L10 having positive optical power, an eleventh lens L11 having positive optical power, and a twelfth lens L12 having negative optical power; the focusing lens group G4 includes, in order from the object side to the image side: a thirteenth lens L13 having positive power, a fourteenth lens L14 having positive power, a fifteenth lens L15 having positive power, and a sixteenth lens L16 having negative 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 power, an eighteenth lens L18 having positive power, and a nineteenth lens L19 having negative or positive power.
In the present invention, the zoom lens group G2, the second fixed lens group G3, the focusing lens group G4 and the third fixed lens group G5 at least comprise 6 aspheric lenses, wherein at least four plastic aspheric lenses are included, 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 include at least 2 glass aspherical lenses, and both surfaces of the glass aspherical lenses are aspherical.
Through reasonable focal power distribution and specific glass material selection, the zoom lens is guaranteed to have good resolution under the high-low temperature condition, and through reasonable use of the plastic aspheric surface, on one hand, the manufacturing cost of the lens is reduced, the product competitiveness is improved, on the other hand, the weight of the lens can be reduced, and the lens is convenient to carry.
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 focus lens group and the focal length of the zoom lens group, tolerance sensitivity of the zoom lens group, the focus lens group, and the overall zoom 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 of the wide-angle end of the zoom lens satisfy the following relationship: FG1/FW is more than 12.20 and less than 14.10; the focal length FG2 of the zoom lens group G2 and the focal length FW of 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 of the wide-angle end of the zoom lens satisfy the following relationship: FG3/FW is more than 9.60 and less than 13.10; the focal length FG5 of the third fixed lens group G5 and the focal length FW of the wide-angle end of the zoom lens satisfy the following relationship: FG5/FW is more than 7.20 and less than 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 following relationship is satisfied between the focal length FG2 of the zoom lens group G2 and the stroke D2 of the zoom lens group G2: -0.31 < FG2/|d2| < -0.27; the following relationship is satisfied between the focal length FG4 of the focusing lens group G4 and the stroke D4 of the focusing lens group G4: 1.50 < FG4/|D4| < 2.0.
By reasonably setting the interrelationship of the travel of the zoom lens group along the optical axis, the travel of the focusing lens group along the optical axis and the optical total length of the zoom lens, the travel of the lens group is shorter, the response speed is faster, and the quick response zoom and focusing functions 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 center thickness CT10 of the tenth lens L10 on the optical axis, the center thickness CT12 of the twelfth lens L12 on the optical axis, the center thickness CT18 of the eighteenth lens on the optical axis, and the center thickness CT19 of the nineteenth lens on the optical axis satisfy the following relationship:
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 relation: IND16-IND15 is more than 0.02 and less than 0.08; the ABB 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 relation: 0.78 < SD1/FOV < 0.88.
The Abbe number, the refractive index and the center thickness of the lens are reasonably arranged, so that chromatic aberration of the system is corrected, and meanwhile, high relative illuminance can be realized through reasonable arrangement of focal power and focal length, so that the lens can uniformly collect energy of angles of each view field.
The zoom lens is specifically described below in three specific embodiments. In the following specific embodiments, the object side surface is denoted OBJ, the image side surface is denoted IMA, the aperture stop STO is denoted one surface, and the bonding surface of the bonding lens group is denoted one surface, for example, 3 surfaces in total of one double bonding lens composed of 2 lenses bonded.
The parameters of each example specifically satisfying the above conditional expression are shown in table 1 below:
TABLE 1
In the present invention, the aspherical lens of the zoom lens satisfies the following formula:
wherein z is the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a is that 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 … … are aspheric coefficients of fourth, sixth, eighth, tenth, fourteen, sixteen and … …, respectively.
Example 1:
parameters of each lens of the zoom lens of the present embodiment include: surface type, radius of curvature (R value), thickness, refractive index of material, abbe number, as shown in table 2 below:
TABLE 2
In this example, the aspherical data is shown in Table 3 below, where K is the quadric 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 tenth order respectively:
table 3 the zoom lens of the present embodiment has zoom data of wide angle end and telephoto end as shown in table 4 below.
Wide angle end Long focal end
T1 0.88 34.26
T2 35.06 1.68
T3 14.68 1.73
T4 2.40 15.35
TABLE 4 Table 4
Referring to fig. 1 to 7, in combination with tables 1 to 4, in the present embodiment, 19 lenses are used as the zoom lens, so that the maximum aperture of 1.8 is realized, the zoom ratio exceeds 12 times, the wide angle and the distortion are low, and the full focal length 4K resolution optical zoom is satisfied.
Example 2:
parameters of each lens of the zoom lens of the present embodiment include: surface type, radius of curvature (R value), thickness, refractive index of material, abbe number, as shown in table 5 below:
TABLE 5
In this example, the aspherical data is shown in Table 6 below, where K is the quadric 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 tenth order respectively:
table 6 the zoom lens of the present embodiment has zoom data of wide angle end and telephoto end as shown in table 7 below.
Wide angle end Long focal 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, 19 lenses are used as the zoom lens, wherein 7 aspheric lenses are used, the aperture of the wide-angle end of the lens can reach 1.65, the aperture of the wide-angle end of the lens is large, the wide-angle end of the lens is wide, the distortion is low, the resolution of all 4K is satisfied, the high-low temperature performance is good, and the illumination is high.
Example 3:
parameters of each lens of the zoom lens of the present embodiment include: surface type, radius of curvature (R value), thickness, refractive index of material, abbe number, as shown in table 8 below:
/>
TABLE 8
In this example, the aspherical data is shown in Table 9 below, where K is the quadric 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 tenth order respectively:
/>
TABLE 9
The zoom lens of the present embodiment has zoom data of wide-angle end and telephoto end as shown in table 10 below.
Wide angle end Long focal end
T1 0.88 34.52
T2 35.25 1.61
T3 15.14 1.1
T4 2.35 16.39
Table 10
Referring to fig. 15 to 21, in combination with tables 1, 8 to 10, in the present embodiment, 19 lenses are used as the zoom lens, wherein 6 aspherical lenses are used, the aperture at the wide-angle end of the lens can reach 1.8, the wide angle and the distortion are low, the resolution of 4K is full, the high-low temperature performance is good, and the illumination is high.
The invention provides 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 from an object side to an image side along an optical axis; the zoom lens group can move along the optical axis for the optical zooming of the zoom lens between the wide-angle end and the telephoto end, the focusing lens group can move along the optical axis for compensating the change of the image plane position in the optical zooming process, and the ratio of the focal length FG4 of the focusing lens group to the focal length FW of the wide-angle end of the zoom lens satisfies the following relationship: FG4/FW is more than 4.40 and less than 5.20; the horizontal field angle of the zoom lens can reach 80 degrees, and the maximum aperture can reach 1.65. The video conference zoom lens realizes wide angle low distortion through reasonable group combination, and has wide market application range; the resolution of the lens can reach 4K, the relative illumination is high, and the video requirement is better met. By reasonably distributing the focal power of the lens, clear imaging quality can be ensured in a high-low temperature state; and 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 various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (21)

1. A zoom lens characterized by comprising 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 focusing lens group (G4) having positive optical power, and a third fixed lens group (G5) 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 (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 the optical axis and is used for compensating the change of the image plane position in the optical zooming process, and the ratio of the focal length FG4 of the focusing lens group (G4) to the focal length FW of the wide-angle end of the zoom lens meets the following relation: FG4/FW is more than 4.40 and less than 5.20;
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 zoom lens group (G2) includes, in order from an object side to an image side: 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;
the second fixed lens group (G3) includes, in order from an object side to an image side: a tenth lens (L10) having positive optical power, an eleventh lens (L11) having positive optical power, and a twelfth lens (L12) having negative optical power;
the focus lens group (G4) includes, in order from an object side to an image side: a thirteenth lens (L13) having positive optical power, a fourteenth lens (L14) having positive optical power, a fifteenth lens (L15) having positive optical power, and a sixteenth lens (L16) having negative optical power;
the third fixed lens group (G5) includes, in order from an object side to an 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.
2. Zoom lens according to claim 1, characterized in that the first lens (L1) and the second lens (L2) are cemented lenses.
3. The zoom lens according to claim 2, wherein 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 the following relationship: 12.0 < |R1/F1| < 24.0.
4. A zoom lens according to claim 2, wherein the ABB number ABB2 of the second lens (L2) ranges from 65< ABB2<100.
5. The zoom lens according to claim 2, wherein the maximum aperture SD1 of the first lens (L1) and the maximum field angle FOV of the zoom lens satisfy the following relationship: 0.78 < SD1/FOV < 0.88.
6. A zoom lens according to claim 1, wherein the fifteenth lens (L15) and the sixteenth lens (L16) are cemented lenses.
7. The zoom lens according to claim 6, wherein the refractive index IND15 of the fifteenth lens (L15) and the refractive index IND16 of the sixteenth lens (L16) satisfy the following relationship: 0.02 < IND16-IND15 < 0.08.
8. The zoom lens according to claim 1, wherein a center thickness CT10 of the tenth lens (L10) on the optical axis, a center thickness CT12 of the twelfth lens (L12) on the optical axis, a center thickness CT18 of the eighteenth lens (L18) on the optical axis, and a center thickness CT19 of the nineteenth lens (L19) on the optical axis satisfy the following relationship: 7.0 < CT10+ CT12+ CT18+ CT19 < 8.3.
9. Zoom lens according to any of claims 1 to 8, 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 six aspherical lenses, wherein at least 4 plastic aspherical lenses are comprised, and both faces of the aspherical lenses are aspherical.
10. Zoom lens according to any of claims 1 to 8, wherein the zoom lens group (G2), the second fixed lens group (G3) and the focus lens group (G4) comprise at least two glass aspherical lenses, and both faces of the glass aspherical lenses are aspherical.
11. The zoom lens according to any one of claims 1 to 8, wherein an aperture value Fno of the zoom lens in any one of zoom states satisfies the following relationship: fno <3.7 is more than or equal to 1.65.
12. The zoom lens according to any one of claims 1 to 8, wherein a focal length FG1 of the first fixed lens group (G1) and a focal length FW of the wide-angle end of the zoom lens satisfy the following relationship: 12.20 < FG1/FW < 14.10.
13. The zoom lens according to any one of claims 1 to 8, wherein a focal length FG2 of the zoom lens group (G2) and a focal length FW of the wide-angle end of the zoom lens satisfy the following relationship: -2.20 < FG2/FW < -1.90.
14. The zoom lens according to any one of claims 1 to 8, wherein a focal length FG3 of the second fixed lens group (G3) and a focal length FW of the wide-angle end of the zoom lens satisfy the following relationship: FG3/FW is 9.60 < 13.10.
15. The zoom lens according to any one of claims 1 to 8, wherein a focal length FG5 of the third fixed lens group (G5) and a focal length FW of the wide-angle end of the zoom lens satisfy the following relationship: FG5/FW is 7.20 < 10.10.
16. The zoom lens according to any one of claims 1 to 8, wherein a stroke D2 of the zoom lens group (G2) and a total length TTL of the zoom lens satisfy the following relationship: 0.24 < |D2/TTL| < 0.30.
17. The zoom lens according to any one of claims 1 to 8, wherein a stroke D4 of the focus lens group (G4) and a stroke D2 of the zoom lens group (G2) satisfy the following relationship: 0.36 < |D4/D2| < 0.45.
18. The zoom lens according to any one of claims 1 to 8, wherein a focal length FG4 of the focus lens group (G4) and a focal length FG2 of the zoom lens group (G2) satisfy the following relationship: -2.70 < FG4/FG 2< -2.0.
19. The zoom lens according to any one of claims 1 to 8, wherein a focal length FG2 of the zoom lens group (G2) and a stroke D2 of the zoom lens group (G2) satisfy the following relationship: -0.31 < FG2/|D2| < -0.27.
20. The zoom lens according to any one of claims 1 to 8, wherein a focal length FG4 of the focus lens group (G4) and a stroke D4 of the focus lens group (G4) satisfy the following relationship: 1.50 < FG4/|D4| < 2.0.
21. The zoom lens according to any one of claims 1 to 8, wherein a focal length FW of the zoom lens at a wide-angle end position and a focal length FT of the zoom lens at a telephoto end position satisfy the following relationship: 11.50 < FT/FW < 12.30.
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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
CN113126267A (en) * 2021-05-21 2021-07-16 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
CN113534426A (en) * 2021-07-30 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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Publication number Priority date Publication date Assignee Title
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
CN113126267A (en) * 2021-05-21 2021-07-16 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
CN113534426A (en) * 2021-07-30 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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