CN214846008U - Zoom lens - Google Patents
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- CN214846008U CN214846008U CN202121101460.5U CN202121101460U CN214846008U CN 214846008 U CN214846008 U CN 214846008U CN 202121101460 U CN202121101460 U CN 202121101460U CN 214846008 U CN214846008 U CN 214846008U
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Abstract
The utility model relates to a zoom lens, include along the first fixed crowd (G1), first group (G2), the first group (G4) of zooming that arrange in proper order from the object side to image side of zooming, diaphragm (STOP), the fixed crowd of second (G3), the second crowd of zooming (G4) and focus crowd (G5), first group (G2) of zooming with the second crowd of zooming (G4) can follow the optical axis and remove the completion zoom lens from wide angle to long burnt change, focus crowd (G5) is used for correcting the removal of zoom in-process image plane through moving along the optical axis. The utility model discloses a zoom can be applied to the security protection field, can realize that high resolution, little distortion, big image planes and little volume combine together, can adapt to the monitoring distance and have the field of great change to have high-quality imaging effect, can be applied to artificial intelligence fields such as face identification better.
Description
Technical Field
The utility model relates to an optical imaging technical field especially relates to a zoom.
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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a zoom.
In order to achieve the above object, the present invention provides a zoom lens, including the first fixed crowd, the first crowd, the diaphragm of zooming, the fixed crowd of second, the second crowd of zooming and the focus crowd that arrange in proper order from the object side to image side along the optical axis, the first crowd of zooming with the second crowd of zooming can follow the optical axis and remove the completion zoom lens is from wide angle to long burnt change, the focus crowd is used for correcting the removal of the in-process image plane of zooming through moving along the optical axis.
According to an aspect of the present invention, the first fixed group, the second fixed group and the second zoom group have positive optical power, the first zoom group and the focus group have negative optical power.
According to an aspect of the present invention, the first fixed group 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, which are arranged in order from the object side to the image side along the optical axis, 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 a fifth lens having negative power, a sixth lens having positive power, a seventh lens having negative power, an eighth lens having positive power, and a ninth lens having negative power, which are arranged in this order from the object side to the image side along the optical axis;
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 power, an eleventh lens having negative power, a twelfth lens having positive power, a thirteenth lens having negative power, a fourteenth lens having positive power, and a fifteenth lens having negative 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 refractive power, a seventeenth lens having a negative refractive power, and an eighteenth lens having a positive refractive 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 refractive power, a twentieth lens having a negative refractive power, and a twenty-first lens having a positive refractive 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 focusing group comprises at least one cemented lens group consisting of two lenses.
According to an aspect of the present invention, the first group of zooming, the fixed group of second, the second zoom the crowd with each contain one piece of glass or plastic aspheric lens in the focus crowd at least.
According to an aspect of the present invention, the optical device further includes a cover glass located on the image side of the focusing group.
According to an aspect of the present invention, the focal length f1 of the first fixed group and the focal length fw of 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.
According to an aspect of the present invention, the focal length f2 of the first zoom group and the 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 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.
According to an aspect of the present invention, the focal length f4 of the second zoom group and the focal length fw of 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.
According to an aspect of the present invention, the focal length f5 of the focusing group and the focal length fw of 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.
According to the utility model discloses an aspect, the position of diaphragm satisfies relational expression:
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, the distance D1 that the first zoom group 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.
According to an aspect of the present invention, the distance D2 that the second zoom group 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.
According to one aspect of the present 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 utility model discloses a scheme provides one kind and can be applied to the big image planes of security protection field, the big zoom ratio (17 times) zoom lens of high resolution, the utility model discloses a camera lens is optimized to big image planes, big zoom ratio, can realize high resolution, little distortion, big image planes and little volume and combine together to can cooperate big zoom ratio, full focal length resolution ratio reaches 4K, is applicable to big target surface such as 1/1.2", high resolution chip, thereby can adapt to the field that monitoring distance has great change, and has high-quality formation of image effect. And simultaneously, the utility model discloses to the distortion is corrected to the full burnt section, the full burnt section distortion is less than 10%, can be applied to artificial intelligence fields such as face identification better.
According to the utility model discloses a scheme, zoom lens have two fixed groups, two zoom groups and a focus group, so, two zoom groups and a focus group make the camera lens realize big multiplying power more easily. 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 the utility model discloses a scheme is through the positive and negative of the lens component and each lens that rationally sets up two fixed groups and two zoom groups to rationally set up the veneer mirror group in the lens group, two zoom groups link each other, realize zooming of small volume, big multiplying power.
According to the utility model discloses a scheme is through the positive and negative of the lens component and each lens of reasonable setting focus crowd to possess a three cemented mirror group at least in making the fixed crowd of second. Therefore, the lens assembly can be ensured while the aberration is corrected.
According to the utility model discloses a scheme sets up two at least veneer mirror groups in the focus crowd to make and contain a piece of glass or plastics aspherical lens at least in each other groups except first fixed crowd, thereby realize that the glass moulds mixed collocation, correct the out of focus volume that high low temperature produced, do not need to focus again under the messenger high low temperature state and still keep the power of resolving images comparable with the normal atmospheric temperature.
According to the utility model discloses a scheme, position through making the diaphragm satisfies certain condition, can make zoom's overall length shorter.
According to the utility model discloses a scheme is through the relation of the distance that two zoom crowd removed from wide-angle end to telephoto end and camera lens overall length of reasonable setting, can reduce the camera device that zoom lens is constituteed and be bulky probably.
Drawings
Fig. 1 is a schematic view showing a configuration of a zoom lens according to a first embodiment of the present invention;
fig. 2 schematically shows a wide-angle end MTF chart of the zoom lens according to the first embodiment of the present invention at a normal temperature of 20 degrees under visible light;
fig. 3 is a Through-Focus-MTF diagram schematically illustrating a wide-angle end at 20 degrees at normal temperature and a night infrared of 850nm in a zoom lens according to a first embodiment of the present invention;
fig. 4 is a schematic view showing a configuration of a zoom lens according to a second embodiment of the present invention;
fig. 5 is a schematic view showing an MTF chart at a wide angle end at a normal temperature of 20 degrees and under visible light in a zoom lens according to a second embodiment of the present invention;
fig. 6 is a Through-Focus-MTF diagram schematically illustrating a wide-angle end at a normal temperature of 20 degrees and a night infrared of 850nm in a zoom lens according to a second embodiment of the present invention;
fig. 7 is a schematic view showing a configuration of a zoom lens according to a third embodiment of the present invention;
fig. 8 is a schematic view showing an MTF chart at a wide angle end at a normal temperature of 20 degrees and under visible light in a zoom lens according to a third embodiment of the present invention;
fig. 9 schematically shows a Through-Focus-MTF diagram at a wide angle end of a zoom lens according to 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," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is 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. The utility model discloses in, the focus f1 of first fixed crowd G1 and the focus fw at the wide-angle end of zoom satisfy following relation: 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. Satisfy the above-mentioned setting, make the utility model discloses a zoom can realize the compatibility of big variable rate, big target surface and small volume.
In the present invention, the first fixed group G1 includes 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, which are arranged in this order from the object side to the image side along the optical axis. 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 refractive power, a twentieth lens L20 having negative refractive power, and a twenty-first lens L21 having positive refractive 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.
The utility model discloses in, the position of diaphragm STOP satisfies the relational expression: 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.
The utility model discloses in, the distance D1 that first zoom crowd G2 removed from wide-angle end to telephoto end satisfies following relation with the total optical length TTL of zoom: 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。
To sum up, the utility model discloses a zoom has used the aspheric lens of plastic material to manufacturing cost has been reduced. 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. Additionally, the utility model discloses a high resolution can be realized to the zoom lens, collocates 13 mm's 1/1.2 "CMOS, and the full focal length can reach 800 ten thousand resolution. Through adopting the scheme of mixing mutual collocation is moulded to glass, not only makes the utility model discloses a zoom lens aberration obtains effectual correction, can also make the utility model discloses a zoom does not virtually burnt at-40 ℃ -80 ℃ temperature range. The utility model discloses a zoom still can realize wide-angle end (non-constant light ring) FNO and be less than or equal to 1.6, and the zoom ratio is greater than 17X's big zoom scope, not only can be dual-purpose day and night, has overcome the contradiction between big relative aperture, day and night confocal, little distortion, high low temperature virtual focus and the image resolution moreover to increased the use occasion and the environmental condition scope of camera lens, promoted the quality and the competitiveness of camera lens product.
The zoom lens of the present invention will be 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:
| number of noodles | K | A | B | C | D | E |
| S15 | 0.000 | 0.00E+00 | -2.81E-05 | 1.99E-06 | -9.47E-09 | 1.97E-11 |
| S16 | -6.875 | 0.00E+00 | -1.73E-05 | 1.51E-06 | -6.67E-09 | 1.67E-11 |
| S18 | -10.321 | 0.00E+00 | 1.65E-06 | 2.73E-08 | -5.99E-10 | -5.90E-14 |
| S19 | 0.000 | 0.00E+00 | 3.16E-06 | 3.18E-08 | -1.36E-10 | 8.26E-14 |
| S27 | -0.118 | 0.00E+00 | -3.77E-05 | 1.48E-08 | -2.98E-09 | 1.61E-11 |
| S28 | 26.998 | 0.00E+00 | 3.70E-05 | 2.85E-07 | -3.69E-09 | 6.19E-11 |
| S36 | -0.075 | 0.00E+00 | 1.07E-05 | 2.41E-06 | -5.23E-08 | 1.78E-09 |
| S37 | 8.603 | 0.00E+00 | 1.75E-05 | 1.37E-06 | -5.97E-08 | 1.73E-09 |
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 various modifications and changes may be made by those skilled in the art. 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 (19)
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 of 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.
11. A zoom lens according to any one of claims 1-10, wherein 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.
12. A zoom lens according to any one of claims 1-10, wherein 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.
13. A zoom lens according to any one of claims 1-10, wherein 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.
14. A zoom lens according to any one of claims 1-10, wherein 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.
15. A zoom lens according to any one of claims 1-10, wherein 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.
16. A zoom lens according to any one of claims 1 to 10, wherein 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 plane is, and the TTL is the total optical length of the zoom lens.
17. A zoom lens according to any one of claims 1-10, wherein 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.
18. A zoom lens according to any one of claims 1-10, wherein the distance D2 by which the second zoom group (G4) is moved 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.
19. A zoom lens according to claim 5 or 6, characterized in that the 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 |
|---|---|---|---|
| CN202121101460.5U CN214846008U (en) | 2021-05-21 | 2021-05-21 | Zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121101460.5U CN214846008U (en) | 2021-05-21 | 2021-05-21 | Zoom lens |
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| CN214846008U true CN214846008U (en) | 2021-11-23 |
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- 2021-05-21 CN CN202121101460.5U patent/CN214846008U/en active Active
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