CN113126267A - Zoom lens - Google Patents
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- CN113126267A CN113126267A CN202110560395.0A CN202110560395A CN113126267A CN 113126267 A CN113126267 A CN 113126267A CN 202110560395 A CN202110560395 A CN 202110560395A CN 113126267 A CN113126267 A CN 113126267A
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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
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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
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Abstract
The invention relates to a zoom lens, which comprises a first fixed group (G1), a first zooming group (G2), a STOP (STOP), a second fixed group (G3), a second zooming group (G4) and a focusing group (G5) which are sequentially arranged from the object side to the image side along an optical axis, wherein the first zooming group (G2) and the second zooming group (G4) can move along the optical axis to change the zoom lens from a wide angle to a long focus, and the focusing group (G5) is used for correcting the movement of an image plane in a zooming process by moving along the optical axis. The zoom lens can be applied to the field of security protection, can realize the combination of high resolution, small distortion, large image plane and small volume, can adapt to the field with larger change of monitoring distance, has high-quality imaging effect, and can be better applied to the artificial intelligence field such as face recognition.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a zoom lens.
Background
With the increase of the network speed, the high-quality and high-resolution images can be rapidly transmitted, so that higher requirements are put forward on the imaging quality of the optical lens in the security field. For example, the resolution and zoom range of the lens have higher indexes. The monitoring among the prior art generally can't accomplish big image plane, big multiplying power and little volume compatibility, and the monitoring lens of big image plane is the tight shot mostly, is difficult to control when the monitoring distance changes, and the volume is great, and the optical distortion at different focal length sections changes greatly, and the resolution ratio is lower (mostly 1080P, and the pixel is counted 200 ten thousand), has been not enough to satisfy the demand in the artificial intelligence related fields such as face identification, license plate discernment that present gradually popularized.
Disclosure of Invention
The invention aims to provide a zoom lens.
In order to achieve the above object, the present invention provides a zoom lens, including a first fixed group, a first zoom group, a stop, a second fixed group, a second zoom group, and a focus group, which are arranged in order from an object side to an image side along an optical axis, wherein the first zoom group and the second zoom group are movable along the optical axis to change the zoom lens from a wide angle to a telephoto, and the focus group is configured to correct a movement of an image plane during a magnification change process by moving along the optical axis.
According to an aspect of the invention, the first fixed group, the second fixed group and the second zoom group have positive optical powers, and the first zoom group and the focus group have negative optical powers.
According to an aspect of the present invention, the first fixed group includes, in order from the object side to the image side along the optical axis, a first lens having a negative power, a second lens having a positive power, a third lens having a positive power, and a fourth lens having a positive power, and the first lens and the second lens are cemented to form a cemented lens group.
According to an aspect of the present invention, the first zoom group includes, in order from the object side to the image side along the optical axis, a fifth lens having negative optical power, a sixth lens having positive optical power, a seventh lens having negative optical power, an eighth lens having positive optical power, and a ninth lens having negative optical power;
the seventh lens element and the eighth lens element are cemented together to form a cemented lens group, or the sixth lens element, the seventh lens element and the eighth lens element are cemented together to form a cemented lens group.
According to an aspect of the present invention, the second fixed group includes, in order from the object side to the image side along the optical axis, a tenth lens having positive optical power, an eleventh lens having negative optical power, a twelfth lens having positive optical power, a thirteenth lens having negative optical power, a fourteenth lens having positive optical power, and a fifteenth lens having negative optical power.
According to an aspect of the present invention, the second fixed group comprises at least one cemented lens group consisting of three lenses.
According to an aspect of the present invention, the second zoom group includes a sixteenth lens having a positive optical power, a seventeenth lens having a negative optical power, and an eighteenth lens having a positive optical power, which are arranged in order from the object side to the image side along the optical axis.
According to an aspect of the present invention, the focus group includes a nineteenth lens having a positive power, a twentieth lens having a negative power, and a twenty-first lens having a positive power, which are arranged in order from the object side to the image side along the optical axis.
According to one aspect of the present invention, the focusing group comprises at least one cemented lens group consisting of two lenses.
According to an aspect of the present invention, each of the first zoom group, the second fixed group, the second zoom group and the focus group comprises at least one glass or plastic aspheric lens.
According to one aspect of the invention, further comprising a cover glass located on an image side of the focus group.
According to an aspect of the present invention, a focal length f1 of the first fixed group and a focal length fw at the wide end of the zoom lens satisfy the following relationship: f1/fw is more than or equal to 2 and less than or equal to 10.
According to an aspect of the present invention, a focal length f2 of the first zoom group and a focal length fw of the zoom lens wide-angle end satisfy the following relationship: f2/fw is more than or equal to-3 and less than or equal to-1.
According to an aspect of the present invention, the focal length f3 of the second fixed group and the focal length fw of the zoom lens wide-angle end satisfy the following relationship: f3/fw is more than or equal to 3 and less than or equal to 6.8.
According to an aspect of the present invention, a focal length f4 of the second zoom group and a focal length fw of the zoom lens wide-angle end satisfy the following relationship: f4/fw is more than or equal to 1.3 and less than or equal to 3.78.
According to an aspect of the present invention, a focal length f5 of the focusing group and a focal length fw of the zoom lens at the wide end satisfy the following relationship: f5/fw is not less than-4.93 and not more than-2.94.
According to one aspect of the invention, the position of the diaphragm satisfies the relation:
0.41≤LS-IMG/TTL≤0.51；
wherein L isS-IMGAnd the TTL is the total optical length of the zoom lens.
According to an aspect of the present invention, a distance D1 that the first zoom group moves from the wide angle end to the telephoto end and a total optical length TTL of the zoom lens satisfy the following relationship: D1/TTL is more than or equal to 0.2 and less than or equal to 0.3.
According to an aspect of the present invention, a distance D2 that the second zoom group moves from the wide angle end to the telephoto end and a total optical length TTL of the zoom lens satisfy the following relationship: D2/TTL is more than or equal to 0.08 and less than or equal to 0.13.
According to an aspect of the invention, the refractive index Nd of the fourteenth lensL14And Abbe number VdL14The following conditions are respectively satisfied: 1.70<NdL14<1.95；20<VdL14<50；
Refractive index Nd of the fourteenth lensL14And a refractive index Nd of the fifteenth lensL15The following relationship is satisfied: nd of 0.01 ≤L14-NdL15|≤0.2。
According to the scheme provided by the invention, the large-image-surface and high-resolution-ratio (17-time) continuous zoom lens which can be applied to the field of security and protection is provided, the lens disclosed by the invention is optimized for the large-image-surface and large-magnification-ratio, the combination of high resolution, small distortion, large image surface and small volume can be realized, the large-magnification-ratio can be matched, the resolution of a full focus section reaches 4K, and the full-focus-ratio continuous zoom lens is suitable for large target surface and high-resolution chips such as 1/1.2 ″, so that the full-focus-ratio continuous zoom lens can adapt to the field with larger variation of monitoring distance. Meanwhile, the method aims at correcting the distortion of the full focus segment, the distortion of the full focus segment is less than 10%, and the method can be better applied to the artificial intelligence field such as face recognition.
According to one aspect of the present invention, a zoom lens has two fixed groups, two zoom groups, and one focus group, and thus, the two zoom groups and the one focus group make it easier for the lens to achieve a large magnification. The zoom group is mainly used for zooming, and the focusing group is used for correcting and compensating image plane offset generated in the zooming process. In addition, the arrangement position, the positive and negative of the lens groups and the relation between the focal length of each group and the focal length of the wide-angle end of the lens can be reasonably set, so that the compatibility of large variable magnification, large target surface and small volume can be realized.
According to one scheme of the invention, through reasonably setting the lens composition of two fixed groups and two zooming groups and the positivity and negativity of each lens, and reasonably setting a gluing lens group in the lens groups, the two zooming groups are mutually linked, and the zooming with small volume and large magnification is realized.
According to one scheme of the invention, the lens composition of the focusing group and the positivity and negativity of each lens are reasonably arranged, and at least one triple cemented lens group is arranged in the second fixed group. Therefore, the lens assembly can be ensured while the aberration is corrected.
According to one scheme of the invention, at least one double-cemented lens group is arranged in the focusing group, and each group except the first fixed group at least comprises one glass or plastic aspheric lens, so that glass-plastic mixed matching is realized, the defocusing amount generated by high and low temperatures is corrected, and the resolving power equivalent to the normal temperature is still maintained without refocusing in the high and low temperature states.
According to an aspect of the present invention, the total length of the zoom lens can be made shorter by making the position of the stop satisfy a certain condition.
According to one aspect of the present invention, by reasonably setting the relationship between the moving distance of the two zoom groups from the wide-angle end to the telephoto end and the total length of the lens, the possibility of the volume of the image pickup apparatus including the zoom lens being too large can be reduced.
Drawings
Fig. 1 schematically shows a configuration diagram of a zoom lens according to a first embodiment of the present invention;
fig. 2 schematically shows a wide-angle end MTF chart at normal temperature of 20 degrees under visible light in a zoom lens according to a first embodiment of the present invention;
FIG. 3 is a Through-Focus-MTF diagram schematically illustrating a zoom lens according to a first embodiment of the present invention at a wide-angle end at 20 degrees at room temperature and a nighttime infrared of 850 nm;
FIG. 4 is a schematic diagram showing a configuration of a zoom lens according to a second embodiment of the present invention;
fig. 5 schematically shows a wide-angle end MTF chart at normal temperature of 20 degrees under visible light in a zoom lens according to a second embodiment of the present invention;
FIG. 6 is a Through-Focus-MTF chart at a wide-angle end of a 20 DEG and a night infrared of 850nm in a zoom lens according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram showing a configuration of a zoom lens according to a third embodiment of the present invention;
fig. 8 schematically shows a wide-angle end MTF chart at normal temperature of 20 degrees under visible light in a zoom lens according to a third embodiment of the present invention;
FIG. 9 is a Through-Focus-MTF chart at the wide-angle end of a zoom lens of a third embodiment of the present invention at a normal temperature of 20 degrees and a night infrared of 850 nm.
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.
Referring to fig. 1, the zoom lens of the present invention includes a first fixed group G1, a first zoom group G2, a STOP, a second fixed group G3, a second zoom group G4, and a focus group G5, which are arranged in order from an object side to an image side along an optical axis, and further includes a protective glass CG located on the image side of the focus group G5. The first zoom group G2 and the second zoom group G4 are movable along the optical axis to change the zoom lens from wide to telephoto, and the focus group G5 is used to correct the movement of the image plane caused by magnification change by moving along the optical axis. Wherein the first fixed group G1, the second fixed group G3 and the second zoom group G4 have positive optical power, and the first zoom group G2 and the focus group G5 have negative optical power. In the present invention, the focal length f1 of the first fixed group G1 and the focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f1/fw is more than or equal to 2 and less than or equal to 10. The focal length f2 of the first zoom group G2 and the focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f2/fw is more than or equal to-3 and less than or equal to-1. The focal length f3 of the second fixed group G3 and the focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f3/fw is more than or equal to 3 and less than or equal to 6.8. The focal length f4 of the second zoom group G4 and the focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f4/fw is more than or equal to 1.3 and less than or equal to 3.78. The focal length f5 of the focusing group G5 and the focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f5/fw is not less than-4.93 and not more than-2.94. The zoom lens can realize the compatibility of large variable magnification, large target surface and small volume.
In the present invention, the first fixed group G1 includes, in order from the object side to the image side along the optical axis, 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 glued to form a cemented lens group, and long-focus end aberration correction is achieved. The first zoom group G2 includes, in order from the object side to the image side along the optical axis, a fifth lens L5 having negative optical power, a sixth lens L6 having positive 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 seventh lens element L7 and the eighth lens element L8 are cemented together to form a double cemented lens assembly, or the sixth lens element L6, the seventh lens element L7 and the eighth lens element L8 are cemented together to form a triple cemented lens assembly. The second fixed group G3 includes, in order from the object side to the image side along the optical axis, a tenth lens L10 having positive optical power, an eleventh lens L11 having negative optical power, a twelfth lens L12 having positive optical power, a thirteenth lens L13 having negative optical power, a fourteenth lens L14 having positive optical power, and a fifteenth lens L15 having negative optical power. The second zoom group G4 includes a sixteenth lens L16 having positive optical power, a seventeenth lens L17 having negative optical power, and an eighteenth lens L18 having positive optical power, which are arranged in order from the object side to the image side along the optical axis. Satisfying the above arrangement, the second zoom group G4 can be linked with the first zoom group G2, thereby realizing zooming with small volume and large magnification.
In the present invention, the focus group G5 includes a nineteenth lens L19 having positive power, a twentieth lens L20 having negative power, and a twenty-first lens L21 having positive power, which are arranged in order from the object side to the image side along the optical axis. The second fixed group G3 includes at least one cemented lens group consisting of three lenses, i.e., at least one cemented lens group consisting of three cemented lenses. Thus, the lens can be easily assembled while correcting aberration.
In the present invention, the focusing group G5 at least comprises a cemented lens assembly composed of two lenses, i.e. at least comprises a double cemented lens assembly. In addition, each of the first zoom group G2, the second fixed group G3, the second zoom group G4, and the focus group G5 includes at least one glass or plastic aspheric lens. Therefore, the zoom lens adopts the matching of glass-plastic mixed lenses, can correct the defocusing amount generated by high and low temperatures, and still keeps the resolving power equivalent to the normal temperature without refocusing in the high and low temperature state.
In the present invention, the position of the STOPSatisfy the relation: l is more than or equal to 0.41S-IMGTTL is less than or equal to 0.51. In the above formula, LS-IMGTTL is the total optical length of the zoom lens, i.e. the distance from the central vertex of the front surface of the first lens L1 to the image plane IMA. Thus, when the position of the STOP satisfies the above formula, the total length of the zoom lens can be made short.
In the present invention, the distance D1 by which the first zoom group G2 moves from the wide angle end to the telephoto end and the total optical length TTL of the zoom lens satisfy the following relationship: D1/TTL is more than or equal to 0.2 and less than or equal to 0.3. Further, the distance D2 by which the second zoom group G4 moves from the wide angle end to the telephoto end and the total optical length TTL of the zoom lens satisfy the following relationship: D2/TTL is more than or equal to 0.08 and less than or equal to 0.13. Therefore, the possibility of the oversize of the image pickup device composed of the zoom lens can be reduced.
In the present invention, the refractive index Nd of the fourteenth lens L14L14And Abbe number VdL14The following conditions are respectively satisfied: 1.70<NdL14<1.95；20<VdL14<50. Refractive index Nd of fourteenth lens L14L14And refractive index Nd of fifteenth lens L15L15The following relationship is satisfied: nd of 0.01 ≤L14-NdL15|≤0.2。
In summary, the zoom lens of the present invention uses the aspheric lens made of plastic material, thereby reducing the production cost. In addition, only two glass aspheric lenses are used in the lens, so that the sensitivity of the lens is reduced, the lens is easy to process, and the assembly yield of the lens is greatly increased. In addition, the zoom lens can realize high resolution, and the full focus section can reach 800 ten thousand resolution by matching with a 1/1.2' CMOS with 13 mm. By adopting the scheme of mixing glass and plastic and mutually matching, the aberration of the zoom lens is effectively corrected, and the zoom lens can not be virtual-burnt within the temperature range of minus 40-80 ℃. The zoom lens can also realize a large zooming range with the wide-angle end (non-constant aperture) FNO less than or equal to 1.6 and the zoom ratio greater than 17X, can be used for both day and night, and overcomes the contradiction between large relative aperture, day and night confocal property, small distortion, high and low temperature virtual focus and image resolving power, thereby increasing the application occasions and environmental condition range of the lens and improving the quality and competitiveness of lens products.
The zoom lens of the present invention is specifically described below in three groups of embodiments. In the following embodiments, the surfaces of the lenses and the plate glass CG are denoted by S1, S2, …, and SN, the object surface is denoted by OBJ, the STOP is denoted by STOP, the image surface is denoted by IMA, and the cemented surface of the cemented lens group is denoted by one surface. The aspherical formula is as follows:
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. the4、A6、A8、A10、A12Respectively representing aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order.
The parameters of each embodiment specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
First embodiment
Referring to fig. 1, in the present embodiment, the seventh lens L7 and the eighth lens L8 in the first zoom group G2 are cemented to form a double cemented lens group; the eleventh lens L11, the twelfth lens L12 and the thirteenth lens L13 in the second fixed group G3 are cemented to form a triple cemented lens group, and the fourteenth lens L14 and the fifteenth lens L15 are cemented to form a double cemented lens group; the nineteenth lens L19 and the twentieth lens L20 in the focusing group G5 are cemented to form a double cemented lens group. The ninth lens L9 and the twenty-first lens L21 are made of plastic, and the tenth lens L10 and the sixteenth lens L16 are made of glass aspheric surfaces.
The parameters of the lens of the zoom lens according to the present embodiment include surface type, radius of curvature, thickness, refractive index of the material, and abbe number, as shown in table 2 below:
TABLE 2
The aspherical surface coefficients of the aspherical lenses in this embodiment are shown in table 3 below:
| number of noodles | K | A | B | C | D | E |
| S15 | 1.055 | 0.00E+00 | -2.76E-04 | 1.93E-06 | -9.09E-09 | 1.87E-11 |
| S16 | -6.166 | 0.00E+00 | -1.70E-04 | 1.47E-06 | -7.36E-09 | 1.59E-11 |
| S18 | -0.841 | 0.00E+00 | 1.63E-06 | 2.65E-08 | -5.75E-11 | -5.60E-14 |
| S19 | 0.000 | 0.00E+00 | 3.10E-06 | 3.09E-08 | -1.30E-10 | 7.83E-14 |
| S27 | -0.118 | 0.00E+00 | -3.21E-05 | 1.44E-07 | -2.86E-09 | 1.53E-11 |
| S28 | 6.998 | 0.00E+00 | 3.63E-05 | 2.77E-07 | -3.54E-09 | 3.03E-11 |
| S36 | -0.075 | 0.00E+00 | 1.05E-04 | 2.34E-06 | -5.01E-08 | 1.69E-09 |
| S37 | 8.603 | 0.00E+00 | 1.72E-05 | 1.33E-06 | -5.73E-08 | 1.64E-09 |
TABLE 3
Where K is the conic constant of the surface and A, B, C, D, E are the second, fourth, sixth, eighth and tenth order aspheric coefficients, respectively.
The distances of the lens groups at the wide-angle end and the telephoto end of the zoom lens are shown in the following table 4:
| thickness of | Wide angle end | Telescope end |
| D1 | 0.877 | 41.843 |
| D2 | 42.449 | 1.483 |
| D3 | 17.505 | 3.805 |
| D4 | 6.659 | 0.350 |
| D5 | 4.941 | 24.950 |
TABLE 4
Where D1 denotes a distance from the image side of the first fixed group G1 to the object side of the first zoom group G2, D2 denotes a distance from the image side of the second lens group G2 to the object side of the STOP, D3 denotes a distance from the image side of the second fixed group G3 to the object side of the second zoom group G4, D4 denotes a distance from the image side of the second zoom group G4 to the object side of the focus group G5, and D5 denotes a distance from the image side of the focus group G5 to the object side of the protective glass CG. Among them, D1, D2, D3, D4 and D5 are different in the wide angle end and the telephoto end.
As can be seen from fig. 2 and fig. 3, the zoom lens of the present embodiment maintains a good resolving power while achieving a large aperture and a large image plane, corrects positional chromatic aberration and magnification chromatic aberration between 380-.
Second embodiment
Referring to fig. 4, in the present embodiment, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in the first zoom group G2 are cemented to form a triple cemented lens group; the eleventh lens L11 and the twelfth lens L12 in the second fixed group G3 are cemented to form a double cemented lens group, and the thirteenth lens L13, the fourteenth lens L14 and the fifteenth lens L15 are cemented to form a triple cemented lens group; the nineteenth lens L19 and the twentieth lens L20 in the focusing group G5 are cemented to form a double cemented lens group. The ninth lens L9 and the twenty-first lens L21 are made of plastic, and the tenth lens L10 and the sixteenth lens L16 are made of glass aspheric surfaces.
The parameters of the lens of the zoom lens according to the present embodiment include surface type, radius of curvature, thickness, refractive index of the material, and abbe number, as shown in table 5 below:
TABLE 5
The aspherical coefficients of the aspherical lenses in this embodiment are shown in table 6 below:
| number of noodles | K | A | B | C | | E |
| S14 | ||||||
| 0 | 0.00E+00 | -2.80E-04 | 1.61E-06 | -8.55E-09 | 2.42E-11 | |
| S15 | -14.155 | 0.00E+00 | -1.87E-04 | 1.15E-06 | -5.27E-09 | 1.39E-11 |
| S17 | -4.015 | 0.00E+00 | 1.42E-06 | 1.59E-08 | -7.31E-11 | 6.59E-14 |
| S18 | 0.000 | 0.00E+00 | 3.24E-06 | 2.11E-08 | -1.34E-10 | 2.24E-13 |
| S26 | -3.553 | 0.00E+00 | -8.78E-06 | 1.04E-07 | -2.27E-09 | 1.71E-11 |
| S27 | 31.309 | 0.00E+00 | 4.50E-05 | 1.16E-07 | -2.39E-09 | 3.29E-11 |
| S35 | -0.517 | 0.00E+00 | 6.24E-05 | 3.60E-07 | -2.18E-08 | 9.52E-10 |
| S36 | 21.081 | 0.00E+00 | -5.33E-05 | -2.78E-07 | -3.09E-08 | 1.03E-09 |
TABLE 6
Where K is the conic constant of the surface and A, B, C, D, E are the second, fourth, sixth, eighth and tenth order aspheric coefficients, respectively.
The distances of the respective lens groups at the wide-angle end and the telephoto end of the zoom lens are as shown in the following table 7:
| thickness of | Wide angle end | Telescope end |
| D1 | 0.482 | 40.814 |
| D2 | 45.070 | 4.738 |
| D3 | 18.838 | 0.867 |
| D4 | 2.505 | 0.331 |
| D5 | 2.376 | 22.521 |
TABLE 7
Where D1 denotes a distance from the image side of the first fixed group G1 to the object side of the first zoom group G2, D2 denotes a distance from the image side of the second lens group G2 to the object side of the STOP, D3 denotes a distance from the image side of the STOP to the object side of the second fixed group G3, D4 denotes a distance from the image side of the second fixed group G3 to the object side of the second zoom group G4, and D5 denotes a distance from the image side of the second zoom group G4 to the object side of the focus group G5. Among them, D1, D2, D3, D4 and D5 are different in the wide angle end and the telephoto end.
As can be seen from fig. 5 and fig. 6, the zoom lens of the present embodiment maintains a good resolving power while achieving a large aperture and a large image plane, corrects positional chromatic aberration and chromatic aberration of magnification between 380-.
Third embodiment
Referring to fig. 7, in the present embodiment, the seventh lens L7 and the eighth lens L8 in the first zoom group G2 are cemented to form a double cemented lens group; the eleventh lens L11, the twelfth lens L12 and the thirteenth lens L13 in the second fixed group G3 are cemented to form a triple cemented lens group, and the fourteenth lens L14 and the fifteenth lens L15 are cemented to form a double cemented lens group; the nineteenth lens L19 and the twentieth lens L20 in the focusing group G5 are cemented to form a double cemented lens group. The ninth lens L9 and the twenty-first lens L21 are made of plastic, and the tenth lens L10 and the sixteenth lens L16 are made of glass aspheric surfaces.
The parameters of the lens of the zoom lens according to the present embodiment include surface type, radius of curvature, thickness, refractive index of the material, and abbe number, as shown in table 8 below:
TABLE 8
The aspherical coefficients of the aspherical lenses in this embodiment are shown in table 9 below:
TABLE 9
Where K is the conic constant of the surface and A, B, C, D, E are the second, fourth, sixth, eighth and tenth order aspheric coefficients, respectively.
The distances of the respective lens groups at the wide-angle end and the telephoto end of the zoom lens are shown in the following table 10:
| thickness of | Wide angle end | Telescope end |
| D1 | 1.572 | 33.629 |
| D2 | 40.183 | 8.126 |
| D3 | 15.494 | 0.486 |
| D4 | 4.5 | 0.089 |
| D5 | 2.015 | 21.434 |
Watch 10
Where D1 denotes a distance from the image side of the first fixed group G1 to the object side of the first zoom group G2, D2 denotes a distance from the image side of the second lens group G2 to the object side of the stop, D3 denotes a distance from the image side of the stop to the object side of the second fixed group G3, D4 denotes a distance from the image side of the second fixed group G3 to the object side of the second zoom group G4, and D5 denotes a distance from the image side of the second zoom group G4 to the object side of the focus group G5. Among them, D1, D2, D3, D4 and D5 are different in the wide angle end and the telephoto end.
As can be seen from fig. 8 and 9, the zoom lens of the present embodiment maintains a good resolving power while achieving a large aperture and a large image plane, corrects positional chromatic aberration and chromatic aberration of magnification between 380-.
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 a first fixed group (G1), a first zoom group (G2), a STOP (STOP), a second fixed group (G3), a second zoom group (G4), and a focus group (G5) arranged in order from an object side to an image side along an optical axis, wherein the first zoom group (G2) and the second zoom group (G4) are movable along the optical axis to accomplish a change from wide to tele in the zoom lens, and the focus group (G5) is configured to correct a movement of an image plane during zooming by moving along the optical axis.
2. A zoom lens according to claim 1, wherein the first fixed group (G1), the second fixed group (G3) and the second zoom group (G4) have positive optical power, and the first zoom group (G2) and the focus group (G5) have negative optical power.
3. The zoom lens according to claim 1, wherein the first fixed group (G1) comprises, in order from an object side to an image side along an optical axis, 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, and the first lens (L1) and the second lens (L2) are cemented to form a cemented lens group.
4. The zoom lens according to claim 1, wherein the first zoom group (G2) includes, in order from the object side to the image side along the optical axis, a fifth lens (L5) having negative optical power, a sixth lens (L6) having positive 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 seventh lens (L7) and the eighth lens (L8) are cemented to form a cemented lens group, or the sixth lens (L6), the seventh lens (L7) and the eighth lens (L8) are cemented to form a cemented lens group.
5. The zoom lens according to claim 1, wherein the second fixed group (G3) includes, in order from the object side to the image side along the optical axis, a tenth lens (L10) having positive optical power, an eleventh lens (L11) having negative optical power, a twelfth lens (L12) having positive optical power, a thirteenth lens (L13) having negative optical power, a fourteenth lens (L14) having positive optical power, and a fifteenth lens (L15) having negative optical power.
6. A zoom lens according to claim 5, wherein the second fixed group (G3) comprises at least one cemented lens group consisting of three lenses.
7. The zoom lens according to claim 1, wherein the second zoom group (G4) includes a sixteenth lens (L16) having positive optical power, a seventeenth lens (L17) having negative optical power, and an eighteenth lens (L18) having positive optical power, which are arranged in order from the object side to the image side along the optical axis.
8. The zoom lens according to claim 1, wherein the focus group (G5) includes a nineteenth lens (L19) having positive optical power, a twentieth lens (L20) having negative optical power, and a twenty-first lens (L21) having positive optical power, which are arranged in order from the object side to the image side along the optical axis.
9. A zoom lens according to claim 8, wherein the focusing group (G5) comprises at least one cemented lens group consisting of two lenses.
10. The zoom lens according to claim 1, wherein each of the first zoom group (G2), the second fixed group (G3), the second zoom group (G4), and the focus group (G5) comprises at least one glass or plastic aspheric lens;
a focal length f1 of the first fixed group (G1) and a focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f1/fw is more than or equal to 2 and less than or equal to 10;
a focal length f2 of the first zoom group (G2) and a focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f2/fw is more than or equal to-3 and less than or equal to-1;
a focal length f3 of the second fixed group (G3) and a focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f3/fw is more than or equal to 3 and less than or equal to 6.8;
a focal length f4 of the second zoom group (G4) and a focal length fw of the zoom lens at the wide-angle end satisfy the following relationship: f4/fw is more than or equal to 1.3 and less than or equal to 3.78;
a focal length f5 of the focusing group (G5) and a focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f5/fw is not less than 4.93 and not more than 2.94;
the position of the STOP (STOP) satisfies the relation:
0.41≤LS-IMG/TTL≤0.51；
wherein L isS-IMGThe distance between the STOP (STOP) and the image surface is defined, and TTL is the total optical length of the zoom lens;
a distance D1 by which the first zoom group (G2) moves from a wide angle end to a telephoto end and a total optical length TTL of the zoom lens satisfy the following relationship: D1/TTL is more than or equal to 0.2 and less than or equal to 0.3;
a distance D2 by which the second zoom group (G4) moves from the wide angle end to the telephoto end and a total optical length TTL of the zoom lens satisfy the following relationship: D2/TTL is more than or equal to 0.08 and less than or equal to 0.13;
a refractive index Nd of the fourteenth lens (L14)L14And Abbe number VdL14The following conditions are respectively satisfied: 1.70<NdL14<1.95；20<VdL14<50；
A refractive index Nd of the fourteenth lens (L14)L14And a refractive index Nd of the fifteenth lens (L15)L15The following relationship is satisfied: nd of 0.01 ≤L14-NdL15|≤0.2。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110560395.0A CN113126267A (en) | 2021-05-21 | 2021-05-21 | Zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110560395.0A CN113126267A (en) | 2021-05-21 | 2021-05-21 | Zoom lens |
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| CN113126267A true CN113126267A (en) | 2021-07-16 |
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| CN202110560395.0A Pending CN113126267A (en) | 2021-05-21 | 2021-05-21 | Zoom lens |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113885184A (en) * | 2021-10-08 | 2022-01-04 | 嘉兴中润光学科技股份有限公司 | Long-focus zoom lens and image pickup device |
| CN114089520A (en) * | 2021-12-08 | 2022-02-25 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114624869A (en) * | 2022-03-10 | 2022-06-14 | 长春通视光电技术有限公司 | High-resolution and large-zoom-ratio optical system and zoom lens adopting same |
| CN114895443A (en) * | 2022-04-13 | 2022-08-12 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN116679431A (en) * | 2022-02-22 | 2023-09-01 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
| CN117970616A (en) * | 2024-03-28 | 2024-05-03 | 四川新视创伟超高清科技有限公司 | Optical system lens and imaging device |
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2021
- 2021-05-21 CN CN202110560395.0A patent/CN113126267A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113885184A (en) * | 2021-10-08 | 2022-01-04 | 嘉兴中润光学科技股份有限公司 | Long-focus zoom lens and image pickup device |
| CN114089520A (en) * | 2021-12-08 | 2022-02-25 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN116679431A (en) * | 2022-02-22 | 2023-09-01 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
| CN116679431B (en) * | 2022-02-22 | 2024-05-14 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
| CN114624869A (en) * | 2022-03-10 | 2022-06-14 | 长春通视光电技术有限公司 | High-resolution and large-zoom-ratio optical system and zoom lens adopting same |
| CN114624869B (en) * | 2022-03-10 | 2024-03-29 | 长春通视光电技术股份有限公司 | High-resolution and large-zoom-ratio optical system and zoom lens adopting same |
| CN114895443A (en) * | 2022-04-13 | 2022-08-12 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114895443B (en) * | 2022-04-13 | 2024-03-19 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN117970616A (en) * | 2024-03-28 | 2024-05-03 | 四川新视创伟超高清科技有限公司 | Optical system lens and imaging device |
| CN117970616B (en) * | 2024-03-28 | 2024-06-04 | 四川新视创伟超高清科技有限公司 | Optical system lens and imaging device |
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